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     struct sctp_scoping *scope,
1867     int do_update)
1868 {
1869         if ((scope->loopback_scope == 0) &&
1870             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1871                 /*
1872                  * skip loopback if not in scope *
1873                  */
1874                 return (0);
1875         }
1876         switch (ifa->address.sa.sa_family) {
1877 #ifdef INET
1878         case AF_INET:
1879                 if (scope->ipv4_addr_legal) {
1880                         struct sockaddr_in *sin;
1881
1882                         sin = (struct sockaddr_in *)&ifa->address.sin;
1883                         if (sin->sin_addr.s_addr == 0) {
1884                                 /* not in scope , unspecified */
1885                                 return (0);
1886                         }
1887                         if ((scope->ipv4_local_scope == 0) &&
1888                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1889                                 /* private address not in scope */
1890                                 return (0);
1891                         }
1892                 } else {
1893                         return (0);
1894                 }
1895                 break;
1896 #endif
1897 #ifdef INET6
1898         case AF_INET6:
1899                 if (scope->ipv6_addr_legal) {
1900                         struct sockaddr_in6 *sin6;
1901
1902                         /*
1903                          * Must update the flags,  bummer, which means any
1904                          * IFA locks must now be applied HERE <->
1905                          */
1906                         if (do_update) {
1907                                 sctp_gather_internal_ifa_flags(ifa);
1908                         }
1909                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1910                                 return (0);
1911                         }
1912                         /* ok to use deprecated addresses? */
1913                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1914                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1915                                 /* skip unspecifed addresses */
1916                                 return (0);
1917                         }
1918                         if (    /* (local_scope == 0) && */
1919                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1920                                 return (0);
1921                         }
1922                         if ((scope->site_scope == 0) &&
1923                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1924                                 return (0);
1925                         }
1926                 } else {
1927                         return (0);
1928                 }
1929                 break;
1930 #endif
1931         default:
1932                 return (0);
1933         }
1934         return (1);
1935 }
1936
1937 static struct mbuf *
1938 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1939 {
1940 #if defined(INET) || defined(INET6)
1941         struct sctp_paramhdr *parmh;
1942         struct mbuf *mret;
1943         uint16_t plen;
1944
1945 #endif
1946
1947         switch (ifa->address.sa.sa_family) {
1948 #ifdef INET
1949         case AF_INET:
1950                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1951                 break;
1952 #endif
1953 #ifdef INET6
1954         case AF_INET6:
1955                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1956                 break;
1957 #endif
1958         default:
1959                 return (m);
1960         }
1961 #if defined(INET) || defined(INET6)
1962         if (M_TRAILINGSPACE(m) >= plen) {
1963                 /* easy side we just drop it on the end */
1964                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1965                 mret = m;
1966         } else {
1967                 /* Need more space */
1968                 mret = m;
1969                 while (SCTP_BUF_NEXT(mret) != NULL) {
1970                         mret = SCTP_BUF_NEXT(mret);
1971                 }
1972                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1973                 if (SCTP_BUF_NEXT(mret) == NULL) {
1974                         /* We are hosed, can't add more addresses */
1975                         return (m);
1976                 }
1977                 mret = SCTP_BUF_NEXT(mret);
1978                 parmh = mtod(mret, struct sctp_paramhdr *);
1979         }
1980         /* now add the parameter */
1981         switch (ifa->address.sa.sa_family) {
1982 #ifdef INET
1983         case AF_INET:
1984                 {
1985                         struct sctp_ipv4addr_param *ipv4p;
1986                         struct sockaddr_in *sin;
1987
1988                         sin = (struct sockaddr_in *)&ifa->address.sin;
1989                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1990                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1991                         parmh->param_length = htons(plen);
1992                         ipv4p->addr = sin->sin_addr.s_addr;
1993                         SCTP_BUF_LEN(mret) += plen;
1994                         break;
1995                 }
1996 #endif
1997 #ifdef INET6
1998         case AF_INET6:
1999                 {
2000                         struct sctp_ipv6addr_param *ipv6p;
2001                         struct sockaddr_in6 *sin6;
2002
2003                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2004                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2005                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2006                         parmh->param_length = htons(plen);
2007                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2008                             sizeof(ipv6p->addr));
2009                         /* clear embedded scope in the address */
2010                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2011                         SCTP_BUF_LEN(mret) += plen;
2012                         break;
2013                 }
2014 #endif
2015         default:
2016                 return (m);
2017         }
2018         if (len != NULL) {
2019                 *len += plen;
2020         }
2021         return (mret);
2022 #endif
2023 }
2024
2025
2026 struct mbuf *
2027 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2028     struct sctp_scoping *scope,
2029     struct mbuf *m_at, int cnt_inits_to,
2030     uint16_t * padding_len, uint16_t * chunk_len)
2031 {
2032         struct sctp_vrf *vrf = NULL;
2033         int cnt, limit_out = 0, total_count;
2034         uint32_t vrf_id;
2035
2036         vrf_id = inp->def_vrf_id;
2037         SCTP_IPI_ADDR_RLOCK();
2038         vrf = sctp_find_vrf(vrf_id);
2039         if (vrf == NULL) {
2040                 SCTP_IPI_ADDR_RUNLOCK();
2041                 return (m_at);
2042         }
2043         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2044                 struct sctp_ifa *sctp_ifap;
2045                 struct sctp_ifn *sctp_ifnp;
2046
2047                 cnt = cnt_inits_to;
2048                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2049                         limit_out = 1;
2050                         cnt = SCTP_ADDRESS_LIMIT;
2051                         goto skip_count;
2052                 }
2053                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2054                         if ((scope->loopback_scope == 0) &&
2055                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2056                                 /*
2057                                  * Skip loopback devices if loopback_scope
2058                                  * not set
2059                                  */
2060                                 continue;
2061                         }
2062                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2063                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2064                                         continue;
2065                                 }
2066                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2067                                         continue;
2068                                 }
2069                                 cnt++;
2070                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2071                                         break;
2072                                 }
2073                         }
2074                         if (cnt > SCTP_ADDRESS_LIMIT) {
2075                                 break;
2076                         }
2077                 }
2078 skip_count:
2079                 if (cnt > 1) {
2080                         total_count = 0;
2081                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2082                                 cnt = 0;
2083                                 if ((scope->loopback_scope == 0) &&
2084                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2085                                         /*
2086                                          * Skip loopback devices if
2087                                          * loopback_scope not set
2088                                          */
2089                                         continue;
2090                                 }
2091                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2092                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2093                                                 continue;
2094                                         }
2095                                         if (sctp_is_address_in_scope(sctp_ifap,
2096                                             scope, 0) == 0) {
2097                                                 continue;
2098                                         }
2099                                         if ((chunk_len != NULL) &&
2100                                             (padding_len != NULL) &&
2101                                             (*padding_len > 0)) {
2102                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2103                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2104                                                 *chunk_len += *padding_len;
2105                                                 *padding_len = 0;
2106                                         }
2107                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2108                                         if (limit_out) {
2109                                                 cnt++;
2110                                                 total_count++;
2111                                                 if (cnt >= 2) {
2112                                                         /*
2113                                                          * two from each
2114                                                          * address
2115                                                          */
2116                                                         break;
2117                                                 }
2118                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2119                                                         /* No more addresses */
2120                                                         break;
2121                                                 }
2122                                         }
2123                                 }
2124                         }
2125                 }
2126         } else {
2127                 struct sctp_laddr *laddr;
2128
2129                 cnt = cnt_inits_to;
2130                 /* First, how many ? */
2131                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2132                         if (laddr->ifa == NULL) {
2133                                 continue;
2134                         }
2135                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2136                                 /*
2137                                  * Address being deleted by the system, dont
2138                                  * list.
2139                                  */
2140                                 continue;
2141                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2142                                 /*
2143                                  * Address being deleted on this ep don't
2144                                  * list.
2145                                  */
2146                                 continue;
2147                         }
2148                         if (sctp_is_address_in_scope(laddr->ifa,
2149                             scope, 1) == 0) {
2150                                 continue;
2151                         }
2152                         cnt++;
2153                 }
2154                 /*
2155                  * To get through a NAT we only list addresses if we have
2156                  * more than one. That way if you just bind a single address
2157                  * we let the source of the init dictate our address.
2158                  */
2159                 if (cnt > 1) {
2160                         cnt = cnt_inits_to;
2161                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2162                                 if (laddr->ifa == NULL) {
2163                                         continue;
2164                                 }
2165                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2166                                         continue;
2167                                 }
2168                                 if (sctp_is_address_in_scope(laddr->ifa,
2169                                     scope, 0) == 0) {
2170                                         continue;
2171                                 }
2172                                 if ((chunk_len != NULL) &&
2173                                     (padding_len != NULL) &&
2174                                     (*padding_len > 0)) {
2175                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2176                                         SCTP_BUF_LEN(m_at) += *padding_len;
2177                                         *chunk_len += *padding_len;
2178                                         *padding_len = 0;
2179                                 }
2180                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2181                                 cnt++;
2182                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2183                                         break;
2184                                 }
2185                         }
2186                 }
2187         }
2188         SCTP_IPI_ADDR_RUNLOCK();
2189         return (m_at);
2190 }
2191
2192 static struct sctp_ifa *
2193 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2194     uint8_t dest_is_loop,
2195     uint8_t dest_is_priv,
2196     sa_family_t fam)
2197 {
2198         uint8_t dest_is_global = 0;
2199
2200         /* dest_is_priv is true if destination is a private address */
2201         /* dest_is_loop is true if destination is a loopback addresses */
2202
2203         /**
2204          * Here we determine if its a preferred address. A preferred address
2205          * means it is the same scope or higher scope then the destination.
2206          * L = loopback, P = private, G = global
2207          * -----------------------------------------
2208          *    src    |  dest | result
2209          *  ----------------------------------------
2210          *     L     |    L  |    yes
2211          *  -----------------------------------------
2212          *     P     |    L  |    yes-v4 no-v6
2213          *  -----------------------------------------
2214          *     G     |    L  |    yes-v4 no-v6
2215          *  -----------------------------------------
2216          *     L     |    P  |    no
2217          *  -----------------------------------------
2218          *     P     |    P  |    yes
2219          *  -----------------------------------------
2220          *     G     |    P  |    no
2221          *   -----------------------------------------
2222          *     L     |    G  |    no
2223          *   -----------------------------------------
2224          *     P     |    G  |    no
2225          *    -----------------------------------------
2226          *     G     |    G  |    yes
2227          *    -----------------------------------------
2228          */
2229
2230         if (ifa->address.sa.sa_family != fam) {
2231                 /* forget mis-matched family */
2232                 return (NULL);
2233         }
2234         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2235                 dest_is_global = 1;
2236         }
2237         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2238         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2239         /* Ok the address may be ok */
2240 #ifdef INET6
2241         if (fam == AF_INET6) {
2242                 /* ok to use deprecated addresses? no lets not! */
2243                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2244                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2245                         return (NULL);
2246                 }
2247                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2248                         if (dest_is_loop) {
2249                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2250                                 return (NULL);
2251                         }
2252                 }
2253                 if (ifa->src_is_glob) {
2254                         if (dest_is_loop) {
2255                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2256                                 return (NULL);
2257                         }
2258                 }
2259         }
2260 #endif
2261         /*
2262          * Now that we know what is what, implement or table this could in
2263          * theory be done slicker (it used to be), but this is
2264          * straightforward and easier to validate :-)
2265          */
2266         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2267             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2268         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2269             dest_is_loop, dest_is_priv, dest_is_global);
2270
2271         if ((ifa->src_is_loop) && (dest_is_priv)) {
2272                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2273                 return (NULL);
2274         }
2275         if ((ifa->src_is_glob) && (dest_is_priv)) {
2276                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2277                 return (NULL);
2278         }
2279         if ((ifa->src_is_loop) && (dest_is_global)) {
2280                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2281                 return (NULL);
2282         }
2283         if ((ifa->src_is_priv) && (dest_is_global)) {
2284                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2285                 return (NULL);
2286         }
2287         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2288         /* its a preferred address */
2289         return (ifa);
2290 }
2291
2292 static struct sctp_ifa *
2293 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2294     uint8_t dest_is_loop,
2295     uint8_t dest_is_priv,
2296     sa_family_t fam)
2297 {
2298         uint8_t dest_is_global = 0;
2299
2300         /**
2301          * Here we determine if its a acceptable address. A acceptable
2302          * address means it is the same scope or higher scope but we can
2303          * allow for NAT which means its ok to have a global dest and a
2304          * private src.
2305          *
2306          * L = loopback, P = private, G = global
2307          * -----------------------------------------
2308          *  src    |  dest | result
2309          * -----------------------------------------
2310          *   L     |   L   |    yes
2311          *  -----------------------------------------
2312          *   P     |   L   |    yes-v4 no-v6
2313          *  -----------------------------------------
2314          *   G     |   L   |    yes
2315          * -----------------------------------------
2316          *   L     |   P   |    no
2317          * -----------------------------------------
2318          *   P     |   P   |    yes
2319          * -----------------------------------------
2320          *   G     |   P   |    yes - May not work
2321          * -----------------------------------------
2322          *   L     |   G   |    no
2323          * -----------------------------------------
2324          *   P     |   G   |    yes - May not work
2325          * -----------------------------------------
2326          *   G     |   G   |    yes
2327          * -----------------------------------------
2328          */
2329
2330         if (ifa->address.sa.sa_family != fam) {
2331                 /* forget non matching family */
2332                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2333                     ifa->address.sa.sa_family, fam);
2334                 return (NULL);
2335         }
2336         /* Ok the address may be ok */
2337         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2338         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2339             dest_is_loop, dest_is_priv);
2340         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2341                 dest_is_global = 1;
2342         }
2343 #ifdef INET6
2344         if (fam == AF_INET6) {
2345                 /* ok to use deprecated addresses? */
2346                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2347                         return (NULL);
2348                 }
2349                 if (ifa->src_is_priv) {
2350                         /* Special case, linklocal to loop */
2351                         if (dest_is_loop)
2352                                 return (NULL);
2353                 }
2354         }
2355 #endif
2356         /*
2357          * Now that we know what is what, implement our table. This could in
2358          * theory be done slicker (it used to be), but this is
2359          * straightforward and easier to validate :-)
2360          */
2361         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2362             ifa->src_is_loop,
2363             dest_is_priv);
2364         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2365                 return (NULL);
2366         }
2367         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2368             ifa->src_is_loop,
2369             dest_is_global);
2370         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2371                 return (NULL);
2372         }
2373         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2374         /* its an acceptable address */
2375         return (ifa);
2376 }
2377
2378 int
2379 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2380 {
2381         struct sctp_laddr *laddr;
2382
2383         if (stcb == NULL) {
2384                 /* There are no restrictions, no TCB :-) */
2385                 return (0);
2386         }
2387         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2388                 if (laddr->ifa == NULL) {
2389                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2390                             __FUNCTION__);
2391                         continue;
2392                 }
2393                 if (laddr->ifa == ifa) {
2394                         /* Yes it is on the list */
2395                         return (1);
2396                 }
2397         }
2398         return (0);
2399 }
2400
2401
2402 int
2403 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2404 {
2405         struct sctp_laddr *laddr;
2406
2407         if (ifa == NULL)
2408                 return (0);
2409         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2410                 if (laddr->ifa == NULL) {
2411                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2412                             __FUNCTION__);
2413                         continue;
2414                 }
2415                 if ((laddr->ifa == ifa) && laddr->action == 0)
2416                         /* same pointer */
2417                         return (1);
2418         }
2419         return (0);
2420 }
2421
2422
2423
2424 static struct sctp_ifa *
2425 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2426     sctp_route_t * ro,
2427     uint32_t vrf_id,
2428     int non_asoc_addr_ok,
2429     uint8_t dest_is_priv,
2430     uint8_t dest_is_loop,
2431     sa_family_t fam)
2432 {
2433         struct sctp_laddr *laddr, *starting_point;
2434         void *ifn;
2435         int resettotop = 0;
2436         struct sctp_ifn *sctp_ifn;
2437         struct sctp_ifa *sctp_ifa, *sifa;
2438         struct sctp_vrf *vrf;
2439         uint32_t ifn_index;
2440
2441         vrf = sctp_find_vrf(vrf_id);
2442         if (vrf == NULL)
2443                 return (NULL);
2444
2445         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2446         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2447         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2448         /*
2449          * first question, is the ifn we will emit on in our list, if so, we
2450          * want such an address. Note that we first looked for a preferred
2451          * address.
2452          */
2453         if (sctp_ifn) {
2454                 /* is a preferred one on the interface we route out? */
2455                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2456                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2457                             (non_asoc_addr_ok == 0))
2458                                 continue;
2459                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2460                             dest_is_loop,
2461                             dest_is_priv, fam);
2462                         if (sifa == NULL)
2463                                 continue;
2464                         if (sctp_is_addr_in_ep(inp, sifa)) {
2465                                 atomic_add_int(&sifa->refcount, 1);
2466                                 return (sifa);
2467                         }
2468                 }
2469         }
2470         /*
2471          * ok, now we now need to find one on the list of the addresses. We
2472          * can't get one on the emitting interface so let's find first a
2473          * preferred one. If not that an acceptable one otherwise... we
2474          * return NULL.
2475          */
2476         starting_point = inp->next_addr_touse;
2477 once_again:
2478         if (inp->next_addr_touse == NULL) {
2479                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2480                 resettotop = 1;
2481         }
2482         for (laddr = inp->next_addr_touse; laddr;
2483             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2484                 if (laddr->ifa == NULL) {
2485                         /* address has been removed */
2486                         continue;
2487                 }
2488                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2489                         /* address is being deleted */
2490                         continue;
2491                 }
2492                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2493                     dest_is_priv, fam);
2494                 if (sifa == NULL)
2495                         continue;
2496                 atomic_add_int(&sifa->refcount, 1);
2497                 return (sifa);
2498         }
2499         if (resettotop == 0) {
2500                 inp->next_addr_touse = NULL;
2501                 goto once_again;
2502         }
2503         inp->next_addr_touse = starting_point;
2504         resettotop = 0;
2505 once_again_too:
2506         if (inp->next_addr_touse == NULL) {
2507                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2508                 resettotop = 1;
2509         }
2510         /* ok, what about an acceptable address in the inp */
2511         for (laddr = inp->next_addr_touse; laddr;
2512             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2513                 if (laddr->ifa == NULL) {
2514                         /* address has been removed */
2515                         continue;
2516                 }
2517                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2518                         /* address is being deleted */
2519                         continue;
2520                 }
2521                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2522                     dest_is_priv, fam);
2523                 if (sifa == NULL)
2524                         continue;
2525                 atomic_add_int(&sifa->refcount, 1);
2526                 return (sifa);
2527         }
2528         if (resettotop == 0) {
2529                 inp->next_addr_touse = NULL;
2530                 goto once_again_too;
2531         }
2532         /*
2533          * no address bound can be a source for the destination we are in
2534          * trouble
2535          */
2536         return (NULL);
2537 }
2538
2539
2540
2541 static struct sctp_ifa *
2542 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2543     struct sctp_tcb *stcb,
2544     sctp_route_t * ro,
2545     uint32_t vrf_id,
2546     uint8_t dest_is_priv,
2547     uint8_t dest_is_loop,
2548     int non_asoc_addr_ok,
2549     sa_family_t fam)
2550 {
2551         struct sctp_laddr *laddr, *starting_point;
2552         void *ifn;
2553         struct sctp_ifn *sctp_ifn;
2554         struct sctp_ifa *sctp_ifa, *sifa;
2555         uint8_t start_at_beginning = 0;
2556         struct sctp_vrf *vrf;
2557         uint32_t ifn_index;
2558
2559         /*
2560          * first question, is the ifn we will emit on in our list, if so, we
2561          * want that one.
2562          */
2563         vrf = sctp_find_vrf(vrf_id);
2564         if (vrf == NULL)
2565                 return (NULL);
2566
2567         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2568         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2569         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2570
2571         /*
2572          * first question, is the ifn we will emit on in our list?  If so,
2573          * we want that one. First we look for a preferred. Second, we go
2574          * for an acceptable.
2575          */
2576         if (sctp_ifn) {
2577                 /* first try for a preferred address on the ep */
2578                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2579                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2580                                 continue;
2581                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2582                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2583                                 if (sifa == NULL)
2584                                         continue;
2585                                 if (((non_asoc_addr_ok == 0) &&
2586                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2587                                     (non_asoc_addr_ok &&
2588                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2589                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2590                                         /* on the no-no list */
2591                                         continue;
2592                                 }
2593                                 atomic_add_int(&sifa->refcount, 1);
2594                                 return (sifa);
2595                         }
2596                 }
2597                 /* next try for an acceptable address on the ep */
2598                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2599                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2600                                 continue;
2601                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2602                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2603                                 if (sifa == NULL)
2604                                         continue;
2605                                 if (((non_asoc_addr_ok == 0) &&
2606                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2607                                     (non_asoc_addr_ok &&
2608                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2609                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2610                                         /* on the no-no list */
2611                                         continue;
2612                                 }
2613                                 atomic_add_int(&sifa->refcount, 1);
2614                                 return (sifa);
2615                         }
2616                 }
2617
2618         }
2619         /*
2620          * if we can't find one like that then we must look at all addresses
2621          * bound to pick one at first preferable then secondly acceptable.
2622          */
2623         starting_point = stcb->asoc.last_used_address;
2624 sctp_from_the_top:
2625         if (stcb->asoc.last_used_address == NULL) {
2626                 start_at_beginning = 1;
2627                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2628         }
2629         /* search beginning with the last used address */
2630         for (laddr = stcb->asoc.last_used_address; laddr;
2631             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2632                 if (laddr->ifa == NULL) {
2633                         /* address has been removed */
2634                         continue;
2635                 }
2636                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2637                         /* address is being deleted */
2638                         continue;
2639                 }
2640                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2641                 if (sifa == NULL)
2642                         continue;
2643                 if (((non_asoc_addr_ok == 0) &&
2644                     (sctp_is_addr_restricted(stcb, sifa))) ||
2645                     (non_asoc_addr_ok &&
2646                     (sctp_is_addr_restricted(stcb, sifa)) &&
2647                     (!sctp_is_addr_pending(stcb, sifa)))) {
2648                         /* on the no-no list */
2649                         continue;
2650                 }
2651                 stcb->asoc.last_used_address = laddr;
2652                 atomic_add_int(&sifa->refcount, 1);
2653                 return (sifa);
2654         }
2655         if (start_at_beginning == 0) {
2656                 stcb->asoc.last_used_address = NULL;
2657                 goto sctp_from_the_top;
2658         }
2659         /* now try for any higher scope than the destination */
2660         stcb->asoc.last_used_address = starting_point;
2661         start_at_beginning = 0;
2662 sctp_from_the_top2:
2663         if (stcb->asoc.last_used_address == NULL) {
2664                 start_at_beginning = 1;
2665                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2666         }
2667         /* search beginning with the last used address */
2668         for (laddr = stcb->asoc.last_used_address; laddr;
2669             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2670                 if (laddr->ifa == NULL) {
2671                         /* address has been removed */
2672                         continue;
2673                 }
2674                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2675                         /* address is being deleted */
2676                         continue;
2677                 }
2678                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2679                     dest_is_priv, fam);
2680                 if (sifa == NULL)
2681                         continue;
2682                 if (((non_asoc_addr_ok == 0) &&
2683                     (sctp_is_addr_restricted(stcb, sifa))) ||
2684                     (non_asoc_addr_ok &&
2685                     (sctp_is_addr_restricted(stcb, sifa)) &&
2686                     (!sctp_is_addr_pending(stcb, sifa)))) {
2687                         /* on the no-no list */
2688                         continue;
2689                 }
2690                 stcb->asoc.last_used_address = laddr;
2691                 atomic_add_int(&sifa->refcount, 1);
2692                 return (sifa);
2693         }
2694         if (start_at_beginning == 0) {
2695                 stcb->asoc.last_used_address = NULL;
2696                 goto sctp_from_the_top2;
2697         }
2698         return (NULL);
2699 }
2700
2701 static struct sctp_ifa *
2702 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2703     struct sctp_tcb *stcb,
2704     int non_asoc_addr_ok,
2705     uint8_t dest_is_loop,
2706     uint8_t dest_is_priv,
2707     int addr_wanted,
2708     sa_family_t fam,
2709     sctp_route_t * ro
2710 )
2711 {
2712         struct sctp_ifa *ifa, *sifa;
2713         int num_eligible_addr = 0;
2714
2715 #ifdef INET6
2716         struct sockaddr_in6 sin6, lsa6;
2717
2718         if (fam == AF_INET6) {
2719                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2720                 (void)sa6_recoverscope(&sin6);
2721         }
2722 #endif                          /* INET6 */
2723         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2724                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2725                     (non_asoc_addr_ok == 0))
2726                         continue;
2727                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2728                     dest_is_priv, fam);
2729                 if (sifa == NULL)
2730                         continue;
2731 #ifdef INET6
2732                 if (fam == AF_INET6 &&
2733                     dest_is_loop &&
2734                     sifa->src_is_loop && sifa->src_is_priv) {
2735                         /*
2736                          * don't allow fe80::1 to be a src on loop ::1, we
2737                          * don't list it to the peer so we will get an
2738                          * abort.
2739                          */
2740                         continue;
2741                 }
2742                 if (fam == AF_INET6 &&
2743                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2744                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2745                         /*
2746                          * link-local <-> link-local must belong to the same
2747                          * scope.
2748                          */
2749                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2750                         (void)sa6_recoverscope(&lsa6);
2751                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2752                                 continue;
2753                         }
2754                 }
2755 #endif                          /* INET6 */
2756
2757                 /*
2758                  * Check if the IPv6 address matches to next-hop. In the
2759                  * mobile case, old IPv6 address may be not deleted from the
2760                  * interface. Then, the interface has previous and new
2761                  * addresses.  We should use one corresponding to the
2762                  * next-hop.  (by micchie)
2763                  */
2764 #ifdef INET6
2765                 if (stcb && fam == AF_INET6 &&
2766                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2767                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2768                             == 0) {
2769                                 continue;
2770                         }
2771                 }
2772 #endif
2773 #ifdef INET
2774                 /* Avoid topologically incorrect IPv4 address */
2775                 if (stcb && fam == AF_INET &&
2776                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2777                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2778                                 continue;
2779                         }
2780                 }
2781 #endif
2782                 if (stcb) {
2783                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2784                                 continue;
2785                         }
2786                         if (((non_asoc_addr_ok == 0) &&
2787                             (sctp_is_addr_restricted(stcb, sifa))) ||
2788                             (non_asoc_addr_ok &&
2789                             (sctp_is_addr_restricted(stcb, sifa)) &&
2790                             (!sctp_is_addr_pending(stcb, sifa)))) {
2791                                 /*
2792                                  * It is restricted for some reason..
2793                                  * probably not yet added.
2794                                  */
2795                                 continue;
2796                         }
2797                 }
2798                 if (num_eligible_addr >= addr_wanted) {
2799                         return (sifa);
2800                 }
2801                 num_eligible_addr++;
2802         }
2803         return (NULL);
2804 }
2805
2806
2807 static int
2808 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2809     struct sctp_tcb *stcb,
2810     int non_asoc_addr_ok,
2811     uint8_t dest_is_loop,
2812     uint8_t dest_is_priv,
2813     sa_family_t fam)
2814 {
2815         struct sctp_ifa *ifa, *sifa;
2816         int num_eligible_addr = 0;
2817
2818         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2819                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2820                     (non_asoc_addr_ok == 0)) {
2821                         continue;
2822                 }
2823                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2824                     dest_is_priv, fam);
2825                 if (sifa == NULL) {
2826                         continue;
2827                 }
2828                 if (stcb) {
2829                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2830                                 continue;
2831                         }
2832                         if (((non_asoc_addr_ok == 0) &&
2833                             (sctp_is_addr_restricted(stcb, sifa))) ||
2834                             (non_asoc_addr_ok &&
2835                             (sctp_is_addr_restricted(stcb, sifa)) &&
2836                             (!sctp_is_addr_pending(stcb, sifa)))) {
2837                                 /*
2838                                  * It is restricted for some reason..
2839                                  * probably not yet added.
2840                                  */
2841                                 continue;
2842                         }
2843                 }
2844                 num_eligible_addr++;
2845         }
2846         return (num_eligible_addr);
2847 }
2848
2849 static struct sctp_ifa *
2850 sctp_choose_boundall(struct sctp_tcb *stcb,
2851     struct sctp_nets *net,
2852     sctp_route_t * ro,
2853     uint32_t vrf_id,
2854     uint8_t dest_is_priv,
2855     uint8_t dest_is_loop,
2856     int non_asoc_addr_ok,
2857     sa_family_t fam)
2858 {
2859         int cur_addr_num = 0, num_preferred = 0;
2860         void *ifn;
2861         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2862         struct sctp_ifa *sctp_ifa, *sifa;
2863         uint32_t ifn_index;
2864         struct sctp_vrf *vrf;
2865
2866 #ifdef INET
2867         int retried = 0;
2868
2869 #endif
2870
2871         /*-
2872          * For boundall we can use any address in the association.
2873          * If non_asoc_addr_ok is set we can use any address (at least in
2874          * theory). So we look for preferred addresses first. If we find one,
2875          * we use it. Otherwise we next try to get an address on the
2876          * interface, which we should be able to do (unless non_asoc_addr_ok
2877          * is false and we are routed out that way). In these cases where we
2878          * can't use the address of the interface we go through all the
2879          * ifn's looking for an address we can use and fill that in. Punting
2880          * means we send back address 0, which will probably cause problems
2881          * actually since then IP will fill in the address of the route ifn,
2882          * which means we probably already rejected it.. i.e. here comes an
2883          * abort :-<.
2884          */
2885         vrf = sctp_find_vrf(vrf_id);
2886         if (vrf == NULL)
2887                 return (NULL);
2888
2889         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2890         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2891         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2892         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2893         if (sctp_ifn == NULL) {
2894                 /* ?? We don't have this guy ?? */
2895                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2896                 goto bound_all_plan_b;
2897         }
2898         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2899             ifn_index, sctp_ifn->ifn_name);
2900
2901         if (net) {
2902                 cur_addr_num = net->indx_of_eligible_next_to_use;
2903         }
2904         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2905             stcb,
2906             non_asoc_addr_ok,
2907             dest_is_loop,
2908             dest_is_priv, fam);
2909         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2910             num_preferred, sctp_ifn->ifn_name);
2911         if (num_preferred == 0) {
2912                 /*
2913                  * no eligible addresses, we must use some other interface
2914                  * address if we can find one.
2915                  */
2916                 goto bound_all_plan_b;
2917         }
2918         /*
2919          * Ok we have num_eligible_addr set with how many we can use, this
2920          * may vary from call to call due to addresses being deprecated
2921          * etc..
2922          */
2923         if (cur_addr_num >= num_preferred) {
2924                 cur_addr_num = 0;
2925         }
2926         /*
2927          * select the nth address from the list (where cur_addr_num is the
2928          * nth) and 0 is the first one, 1 is the second one etc...
2929          */
2930         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2931
2932         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2933             dest_is_priv, cur_addr_num, fam, ro);
2934
2935         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2936         if (sctp_ifa) {
2937                 atomic_add_int(&sctp_ifa->refcount, 1);
2938                 if (net) {
2939                         /* save off where the next one we will want */
2940                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2941                 }
2942                 return (sctp_ifa);
2943         }
2944         /*
2945          * plan_b: Look at all interfaces and find a preferred address. If
2946          * no preferred fall through to plan_c.
2947          */
2948 bound_all_plan_b:
2949         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2950         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2951                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2952                     sctp_ifn->ifn_name);
2953                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2954                         /* wrong base scope */
2955                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2956                         continue;
2957                 }
2958                 if ((sctp_ifn == looked_at) && looked_at) {
2959                         /* already looked at this guy */
2960                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2961                         continue;
2962                 }
2963                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2964                     dest_is_loop, dest_is_priv, fam);
2965                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2966                     "Found ifn:%p %d preferred source addresses\n",
2967                     ifn, num_preferred);
2968                 if (num_preferred == 0) {
2969                         /* None on this interface. */
2970                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2971                         continue;
2972                 }
2973                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2974                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2975                     num_preferred, (void *)sctp_ifn, cur_addr_num);
2976
2977                 /*
2978                  * Ok we have num_eligible_addr set with how many we can
2979                  * use, this may vary from call to call due to addresses
2980                  * being deprecated etc..
2981                  */
2982                 if (cur_addr_num >= num_preferred) {
2983                         cur_addr_num = 0;
2984                 }
2985                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2986                     dest_is_priv, cur_addr_num, fam, ro);
2987                 if (sifa == NULL)
2988                         continue;
2989                 if (net) {
2990                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2991                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2992                             cur_addr_num);
2993                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2994                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2995                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2996                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2997                 }
2998                 atomic_add_int(&sifa->refcount, 1);
2999                 return (sifa);
3000         }
3001 #ifdef INET
3002 again_with_private_addresses_allowed:
3003 #endif
3004         /* plan_c: do we have an acceptable address on the emit interface */
3005         sifa = NULL;
3006         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3007         if (emit_ifn == NULL) {
3008                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3009                 goto plan_d;
3010         }
3011         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3012                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3013                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3014                     (non_asoc_addr_ok == 0)) {
3015                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3016                         continue;
3017                 }
3018                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3019                     dest_is_priv, fam);
3020                 if (sifa == NULL) {
3021                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3022                         continue;
3023                 }
3024                 if (stcb) {
3025                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3026                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3027                                 sifa = NULL;
3028                                 continue;
3029                         }
3030                         if (((non_asoc_addr_ok == 0) &&
3031                             (sctp_is_addr_restricted(stcb, sifa))) ||
3032                             (non_asoc_addr_ok &&
3033                             (sctp_is_addr_restricted(stcb, sifa)) &&
3034                             (!sctp_is_addr_pending(stcb, sifa)))) {
3035                                 /*
3036                                  * It is restricted for some reason..
3037                                  * probably not yet added.
3038                                  */
3039                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3040                                 sifa = NULL;
3041                                 continue;
3042                         }
3043                 } else {
3044                         SCTP_PRINTF("Stcb is null - no print\n");
3045                 }
3046                 atomic_add_int(&sifa->refcount, 1);
3047                 goto out;
3048         }
3049 plan_d:
3050         /*
3051          * plan_d: We are in trouble. No preferred address on the emit
3052          * interface. And not even a preferred address on all interfaces. Go
3053          * out and see if we can find an acceptable address somewhere
3054          * amongst all interfaces.
3055          */
3056         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3057         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3058                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3059                         /* wrong base scope */
3060                         continue;
3061                 }
3062                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3063                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3064                             (non_asoc_addr_ok == 0))
3065                                 continue;
3066                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3067                             dest_is_loop,
3068                             dest_is_priv, fam);
3069                         if (sifa == NULL)
3070                                 continue;
3071                         if (stcb) {
3072                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3073                                         sifa = NULL;
3074                                         continue;
3075                                 }
3076                                 if (((non_asoc_addr_ok == 0) &&
3077                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3078                                     (non_asoc_addr_ok &&
3079                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3080                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3081                                         /*
3082                                          * It is restricted for some
3083                                          * reason.. probably not yet added.
3084                                          */
3085                                         sifa = NULL;
3086                                         continue;
3087                                 }
3088                         }
3089                         goto out;
3090                 }
3091         }
3092 #ifdef INET
3093         if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3094                 stcb->asoc.scope.ipv4_local_scope = 1;
3095                 retried = 1;
3096                 goto again_with_private_addresses_allowed;
3097         } else if (retried == 1) {
3098                 stcb->asoc.scope.ipv4_local_scope = 0;
3099         }
3100 #endif
3101 out:
3102 #ifdef INET
3103         if (sifa) {
3104                 if (retried == 1) {
3105                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3106                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3107                                         /* wrong base scope */
3108                                         continue;
3109                                 }
3110                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3111                                         struct sctp_ifa *tmp_sifa;
3112
3113                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3114                                             (non_asoc_addr_ok == 0))
3115                                                 continue;
3116                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3117                                             dest_is_loop,
3118                                             dest_is_priv, fam);
3119                                         if (tmp_sifa == NULL) {
3120                                                 continue;
3121                                         }
3122                                         if (tmp_sifa == sifa) {
3123                                                 continue;
3124                                         }
3125                                         if (stcb) {
3126                                                 if (sctp_is_address_in_scope(tmp_sifa,
3127                                                     &stcb->asoc.scope, 0) == 0) {
3128                                                         continue;
3129                                                 }
3130                                                 if (((non_asoc_addr_ok == 0) &&
3131                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3132                                                     (non_asoc_addr_ok &&
3133                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3134                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3135                                                         /*
3136                                                          * It is restricted
3137                                                          * for some reason..
3138                                                          * probably not yet
3139                                                          * added.
3140                                                          */
3141                                                         continue;
3142                                                 }
3143                                         }
3144                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3145                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3146                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3147                                         }
3148                                 }
3149                         }
3150                 }
3151                 atomic_add_int(&sifa->refcount, 1);
3152         }
3153 #endif
3154         return (sifa);
3155 }
3156
3157
3158
3159 /* tcb may be NULL */
3160 struct sctp_ifa *
3161 sctp_source_address_selection(struct sctp_inpcb *inp,
3162     struct sctp_tcb *stcb,
3163     sctp_route_t * ro,
3164     struct sctp_nets *net,
3165     int non_asoc_addr_ok, uint32_t vrf_id)
3166 {
3167         struct sctp_ifa *answer;
3168         uint8_t dest_is_priv, dest_is_loop;
3169         sa_family_t fam;
3170
3171 #ifdef INET
3172         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3173
3174 #endif
3175 #ifdef INET6
3176         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3177
3178 #endif
3179
3180         /**
3181          * Rules: - Find the route if needed, cache if I can. - Look at
3182          * interface address in route, Is it in the bound list. If so we
3183          * have the best source. - If not we must rotate amongst the
3184          * addresses.
3185          *
3186          * Cavets and issues
3187          *
3188          * Do we need to pay attention to scope. We can have a private address
3189          * or a global address we are sourcing or sending to. So if we draw
3190          * it out
3191          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3192          * For V4
3193          * ------------------------------------------
3194          *      source     *      dest  *  result
3195          * -----------------------------------------
3196          * <a>  Private    *    Global  *  NAT
3197          * -----------------------------------------
3198          * <b>  Private    *    Private *  No problem
3199          * -----------------------------------------
3200          * <c>  Global     *    Private *  Huh, How will this work?
3201          * -----------------------------------------
3202          * <d>  Global     *    Global  *  No Problem
3203          *------------------------------------------
3204          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3205          * For V6
3206          *------------------------------------------
3207          *      source     *      dest  *  result
3208          * -----------------------------------------
3209          * <a>  Linklocal  *    Global  *
3210          * -----------------------------------------
3211          * <b>  Linklocal  * Linklocal  *  No problem
3212          * -----------------------------------------
3213          * <c>  Global     * Linklocal  *  Huh, How will this work?
3214          * -----------------------------------------
3215          * <d>  Global     *    Global  *  No Problem
3216          *------------------------------------------
3217          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3218          *
3219          * And then we add to that what happens if there are multiple addresses
3220          * assigned to an interface. Remember the ifa on a ifn is a linked
3221          * list of addresses. So one interface can have more than one IP
3222          * address. What happens if we have both a private and a global
3223          * address? Do we then use context of destination to sort out which
3224          * one is best? And what about NAT's sending P->G may get you a NAT
3225          * translation, or should you select the G thats on the interface in
3226          * preference.
3227          *
3228          * Decisions:
3229          *
3230          * - count the number of addresses on the interface.
3231          * - if it is one, no problem except case <c>.
3232          *   For <a> we will assume a NAT out there.
3233          * - if there are more than one, then we need to worry about scope P
3234          *   or G. We should prefer G -> G and P -> P if possible.
3235          *   Then as a secondary fall back to mixed types G->P being a last
3236          *   ditch one.
3237          * - The above all works for bound all, but bound specific we need to
3238          *   use the same concept but instead only consider the bound
3239          *   addresses. If the bound set is NOT assigned to the interface then
3240          *   we must use rotation amongst the bound addresses..
3241          */
3242         if (ro->ro_rt == NULL) {
3243                 /*
3244                  * Need a route to cache.
3245                  */
3246                 SCTP_RTALLOC(ro, vrf_id);
3247         }
3248         if (ro->ro_rt == NULL) {
3249                 return (NULL);
3250         }
3251         fam = ro->ro_dst.sa_family;
3252         dest_is_priv = dest_is_loop = 0;
3253         /* Setup our scopes for the destination */
3254         switch (fam) {
3255 #ifdef INET
3256         case AF_INET:
3257                 /* Scope based on outbound address */
3258                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3259                         dest_is_loop = 1;
3260                         if (net != NULL) {
3261                                 /* mark it as local */
3262                                 net->addr_is_local = 1;
3263                         }
3264                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3265                         dest_is_priv = 1;
3266                 }
3267                 break;
3268 #endif
3269 #ifdef INET6
3270         case AF_INET6:
3271                 /* Scope based on outbound address */
3272                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3273                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3274                         /*
3275                          * If the address is a loopback address, which
3276                          * consists of "::1" OR "fe80::1%lo0", we are
3277                          * loopback scope. But we don't use dest_is_priv
3278                          * (link local addresses).
3279                          */
3280                         dest_is_loop = 1;
3281                         if (net != NULL) {
3282                                 /* mark it as local */
3283                                 net->addr_is_local = 1;
3284                         }
3285                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3286                         dest_is_priv = 1;
3287                 }
3288                 break;
3289 #endif
3290         }
3291         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3292         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3293         SCTP_IPI_ADDR_RLOCK();
3294         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3295                 /*
3296                  * Bound all case
3297                  */
3298                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3299                     dest_is_priv, dest_is_loop,
3300                     non_asoc_addr_ok, fam);
3301                 SCTP_IPI_ADDR_RUNLOCK();
3302                 return (answer);
3303         }
3304         /*
3305          * Subset bound case
3306          */
3307         if (stcb) {
3308                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3309                     vrf_id, dest_is_priv,
3310                     dest_is_loop,
3311                     non_asoc_addr_ok, fam);
3312         } else {
3313                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3314                     non_asoc_addr_ok,
3315                     dest_is_priv,
3316                     dest_is_loop, fam);
3317         }
3318         SCTP_IPI_ADDR_RUNLOCK();
3319         return (answer);
3320 }
3321
3322 static int
3323 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3324 {
3325         struct cmsghdr cmh;
3326         int tlen, at, found;
3327         struct sctp_sndinfo sndinfo;
3328         struct sctp_prinfo prinfo;
3329         struct sctp_authinfo authinfo;
3330
3331         tlen = SCTP_BUF_LEN(control);
3332         at = 0;
3333         found = 0;
3334         /*
3335          * Independent of how many mbufs, find the c_type inside the control
3336          * structure and copy out the data.
3337          */
3338         while (at < tlen) {
3339                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3340                         /* There is not enough room for one more. */
3341                         return (found);
3342                 }
3343                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3344                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3345                         /* We dont't have a complete CMSG header. */
3346                         return (found);
3347                 }
3348                 if (((int)cmh.cmsg_len + at) > tlen) {
3349                         /* We don't have the complete CMSG. */
3350                         return (found);
3351                 }
3352                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3353                     ((c_type == cmh.cmsg_type) ||
3354                     ((c_type == SCTP_SNDRCV) &&
3355                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3356                     (cmh.cmsg_type == SCTP_PRINFO) ||
3357                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3358                         if (c_type == cmh.cmsg_type) {
3359                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3360                                         return (found);
3361                                 }
3362                                 /* It is exactly what we want. Copy it out. */
3363                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3364                                 return (1);
3365                         } else {
3366                                 struct sctp_sndrcvinfo *sndrcvinfo;
3367
3368                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3369                                 if (found == 0) {
3370                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3371                                                 return (found);
3372                                         }
3373                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3374                                 }
3375                                 switch (cmh.cmsg_type) {
3376                                 case SCTP_SNDINFO:
3377                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3378                                                 return (found);
3379                                         }
3380                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3381                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3382                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3383                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3384                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3385                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3386                                         break;
3387                                 case SCTP_PRINFO:
3388                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3389                                                 return (found);
3390                                         }
3391                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3392                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3393                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3394                                         } else {
3395                                                 sndrcvinfo->sinfo_timetolive = 0;
3396                                         }
3397                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3398                                         break;
3399                                 case SCTP_AUTHINFO:
3400                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3401                                                 return (found);
3402                                         }
3403                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3404                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3405                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3406                                         break;
3407                                 default:
3408                                         return (found);
3409                                 }
3410                                 found = 1;
3411                         }
3412                 }
3413                 at += CMSG_ALIGN(cmh.cmsg_len);
3414         }
3415         return (found);
3416 }
3417
3418 static int
3419 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3420 {
3421         struct cmsghdr cmh;
3422         int tlen, at;
3423         struct sctp_initmsg initmsg;
3424
3425 #ifdef INET
3426         struct sockaddr_in sin;
3427
3428 #endif
3429 #ifdef INET6
3430         struct sockaddr_in6 sin6;
3431
3432 #endif
3433
3434         tlen = SCTP_BUF_LEN(control);
3435         at = 0;
3436         while (at < tlen) {
3437                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3438                         /* There is not enough room for one more. */
3439                         *error = EINVAL;
3440                         return (1);
3441                 }
3442                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3443                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3444                         /* We dont't have a complete CMSG header. */
3445                         *error = EINVAL;
3446                         return (1);
3447                 }
3448                 if (((int)cmh.cmsg_len + at) > tlen) {
3449                         /* We don't have the complete CMSG. */
3450                         *error = EINVAL;
3451                         return (1);
3452                 }
3453                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3454                         switch (cmh.cmsg_type) {
3455                         case SCTP_INIT:
3456                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3457                                         *error = EINVAL;
3458                                         return (1);
3459                                 }
3460                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3461                                 if (initmsg.sinit_max_attempts)
3462                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3463                                 if (initmsg.sinit_num_ostreams)
3464                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3465                                 if (initmsg.sinit_max_instreams)
3466                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3467                                 if (initmsg.sinit_max_init_timeo)
3468                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3469                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3470                                         struct sctp_stream_out *tmp_str;
3471                                         unsigned int i;
3472
3473                                         /* Default is NOT correct */
3474                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3475                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3476                                         SCTP_TCB_UNLOCK(stcb);
3477                                         SCTP_MALLOC(tmp_str,
3478                                             struct sctp_stream_out *,
3479                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3480                                             SCTP_M_STRMO);
3481                                         SCTP_TCB_LOCK(stcb);
3482                                         if (tmp_str != NULL) {
3483                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3484                                                 stcb->asoc.strmout = tmp_str;
3485                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3486                                         } else {
3487                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3488                                         }
3489                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3490                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3491                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3492                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3493                                                 stcb->asoc.strmout[i].stream_no = i;
3494                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3495                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3496                                         }
3497                                 }
3498                                 break;
3499 #ifdef INET
3500                         case SCTP_DSTADDRV4:
3501                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3502                                         *error = EINVAL;
3503                                         return (1);
3504                                 }
3505                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3506                                 sin.sin_family = AF_INET;
3507                                 sin.sin_len = sizeof(struct sockaddr_in);
3508                                 sin.sin_port = stcb->rport;
3509                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3510                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3511                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3512                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3513                                         *error = EINVAL;
3514                                         return (1);
3515                                 }
3516                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3517                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3518                                         *error = ENOBUFS;
3519                                         return (1);
3520                                 }
3521                                 break;
3522 #endif
3523 #ifdef INET6
3524                         case SCTP_DSTADDRV6:
3525                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3526                                         *error = EINVAL;
3527                                         return (1);
3528                                 }
3529                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3530                                 sin6.sin6_family = AF_INET6;
3531                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3532                                 sin6.sin6_port = stcb->rport;
3533                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3534                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3535                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3536                                         *error = EINVAL;
3537                                         return (1);
3538                                 }
3539 #ifdef INET
3540                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3541                                         in6_sin6_2_sin(&sin, &sin6);
3542                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3543                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3544                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3545                                                 *error = EINVAL;
3546                                                 return (1);
3547                                         }
3548                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3549                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3550                                                 *error = ENOBUFS;
3551                                                 return (1);
3552                                         }
3553                                 } else
3554 #endif
3555                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3556                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3557                                         *error = ENOBUFS;
3558                                         return (1);
3559                                 }
3560                                 break;
3561 #endif
3562                         default:
3563                                 break;
3564                         }
3565                 }
3566                 at += CMSG_ALIGN(cmh.cmsg_len);
3567         }
3568         return (0);
3569 }
3570
3571 static struct sctp_tcb *
3572 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3573     uint16_t port,
3574     struct mbuf *control,
3575     struct sctp_nets **net_p,
3576     int *error)
3577 {
3578         struct cmsghdr cmh;
3579         int tlen, at;
3580         struct sctp_tcb *stcb;
3581         struct sockaddr *addr;
3582
3583 #ifdef INET
3584         struct sockaddr_in sin;
3585
3586 #endif
3587 #ifdef INET6
3588         struct sockaddr_in6 sin6;
3589
3590 #endif
3591
3592         tlen = SCTP_BUF_LEN(control);
3593         at = 0;
3594         while (at < tlen) {
3595                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3596                         /* There is not enough room for one more. */
3597                         *error = EINVAL;
3598                         return (NULL);
3599                 }
3600                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3601                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3602                         /* We dont't have a complete CMSG header. */
3603                         *error = EINVAL;
3604                         return (NULL);
3605                 }
3606                 if (((int)cmh.cmsg_len + at) > tlen) {
3607                         /* We don't have the complete CMSG. */
3608                         *error = EINVAL;
3609                         return (NULL);
3610                 }
3611                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3612                         switch (cmh.cmsg_type) {
3613 #ifdef INET
3614                         case SCTP_DSTADDRV4:
3615                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3616                                         *error = EINVAL;
3617                                         return (NULL);
3618                                 }
3619                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3620                                 sin.sin_family = AF_INET;
3621                                 sin.sin_len = sizeof(struct sockaddr_in);
3622                                 sin.sin_port = port;
3623                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3624                                 addr = (struct sockaddr *)&sin;
3625                                 break;
3626 #endif
3627 #ifdef INET6
3628                         case SCTP_DSTADDRV6:
3629                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3630                                         *error = EINVAL;
3631                                         return (NULL);
3632                                 }
3633                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3634                                 sin6.sin6_family = AF_INET6;
3635                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3636                                 sin6.sin6_port = port;
3637                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3638 #ifdef INET
3639                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3640                                         in6_sin6_2_sin(&sin, &sin6);
3641                                         addr = (struct sockaddr *)&sin;
3642                                 } else
3643 #endif
3644                                         addr = (struct sockaddr *)&sin6;
3645                                 break;
3646 #endif
3647                         default:
3648                                 addr = NULL;
3649                                 break;
3650                         }
3651                         if (addr) {
3652                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3653                                 if (stcb != NULL) {
3654                                         return (stcb);
3655                                 }
3656                         }
3657                 }
3658                 at += CMSG_ALIGN(cmh.cmsg_len);
3659         }
3660         return (NULL);
3661 }
3662
3663 static struct mbuf *
3664 sctp_add_cookie(struct mbuf *init, int init_offset,
3665     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3666 {
3667         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3668         struct sctp_state_cookie *stc;
3669         struct sctp_paramhdr *ph;
3670         uint8_t *foo;
3671         int sig_offset;
3672         uint16_t cookie_sz;
3673
3674         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3675             sizeof(struct sctp_paramhdr)), 0,
3676             M_NOWAIT, 1, MT_DATA);
3677         if (mret == NULL) {
3678                 return (NULL);
3679         }
3680         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3681         if (copy_init == NULL) {
3682                 sctp_m_freem(mret);
3683                 return (NULL);
3684         }
3685 #ifdef SCTP_MBUF_LOGGING
3686         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3687                 struct mbuf *mat;
3688
3689                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3690                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3691                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3692                         }
3693                 }
3694         }
3695 #endif
3696         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3697             M_NOWAIT);
3698         if (copy_initack == NULL) {
3699                 sctp_m_freem(mret);
3700                 sctp_m_freem(copy_init);
3701                 return (NULL);
3702         }
3703 #ifdef SCTP_MBUF_LOGGING
3704         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3705                 struct mbuf *mat;
3706
3707                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3708                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3709                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3710                         }
3711                 }
3712         }
3713 #endif
3714         /* easy side we just drop it on the end */
3715         ph = mtod(mret, struct sctp_paramhdr *);
3716         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3717             sizeof(struct sctp_paramhdr);
3718         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3719             sizeof(struct sctp_paramhdr));
3720         ph->param_type = htons(SCTP_STATE_COOKIE);
3721         ph->param_length = 0;   /* fill in at the end */
3722         /* Fill in the stc cookie data */
3723         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3724
3725         /* tack the INIT and then the INIT-ACK onto the chain */
3726         cookie_sz = 0;
3727         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3728                 cookie_sz += SCTP_BUF_LEN(m_at);
3729                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3730                         SCTP_BUF_NEXT(m_at) = copy_init;
3731                         break;
3732                 }
3733         }
3734         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3735                 cookie_sz += SCTP_BUF_LEN(m_at);
3736                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3737                         SCTP_BUF_NEXT(m_at) = copy_initack;
3738                         break;
3739                 }
3740         }
3741         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3742                 cookie_sz += SCTP_BUF_LEN(m_at);
3743                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3744                         break;
3745                 }
3746         }
3747         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3748         if (sig == NULL) {
3749                 /* no space, so free the entire chain */
3750                 sctp_m_freem(mret);
3751                 return (NULL);
3752         }
3753         SCTP_BUF_LEN(sig) = 0;
3754         SCTP_BUF_NEXT(m_at) = sig;
3755         sig_offset = 0;
3756         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3757         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3758         *signature = foo;
3759         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3760         cookie_sz += SCTP_SIGNATURE_SIZE;
3761         ph->param_length = htons(cookie_sz);
3762         return (mret);
3763 }
3764
3765
3766 static uint8_t
3767 sctp_get_ect(struct sctp_tcb *stcb)
3768 {
3769         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3770                 return (SCTP_ECT0_BIT);
3771         } else {
3772                 return (0);
3773         }
3774 }
3775
3776 #if defined(INET) || defined(INET6)
3777 static void
3778 sctp_handle_no_route(struct sctp_tcb *stcb,
3779     struct sctp_nets *net,
3780     int so_locked)
3781 {
3782         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3783
3784         if (net) {
3785                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3786                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3787                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3788                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3789                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3790                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3791                                     stcb, 0,
3792                                     (void *)net,
3793                                     so_locked);
3794                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3795                                 net->dest_state &= ~SCTP_ADDR_PF;
3796                         }
3797                 }
3798                 if (stcb) {
3799                         if (net == stcb->asoc.primary_destination) {
3800                                 /* need a new primary */
3801                                 struct sctp_nets *alt;
3802
3803                                 alt = sctp_find_alternate_net(stcb, net, 0);
3804                                 if (alt != net) {
3805                                         if (stcb->asoc.alternate) {
3806                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3807                                         }
3808                                         stcb->asoc.alternate = alt;
3809                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3810                                         if (net->ro._s_addr) {
3811                                                 sctp_free_ifa(net->ro._s_addr);
3812                                                 net->ro._s_addr = NULL;
3813                                         }
3814                                         net->src_addr_selected = 0;
3815                                 }
3816                         }
3817                 }
3818         }
3819 }
3820
3821 #endif
3822
3823 static int
3824 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3825     struct sctp_tcb *stcb,      /* may be NULL */
3826     struct sctp_nets *net,
3827     struct sockaddr *to,
3828     struct mbuf *m,
3829     uint32_t auth_offset,
3830     struct sctp_auth_chunk *auth,
3831     uint16_t auth_keyid,
3832     int nofragment_flag,
3833     int ecn_ok,
3834     int out_of_asoc_ok,
3835     uint16_t src_port,
3836     uint16_t dest_port,
3837     uint32_t v_tag,
3838     uint16_t port,
3839     union sctp_sockstore *over_addr,
3840     uint8_t use_mflowid, uint32_t mflowid,
3841 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3842     int so_locked SCTP_UNUSED
3843 #else
3844     int so_locked
3845 #endif
3846 )
3847 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3848 {
3849         /**
3850          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3851          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3852          * - fill in the HMAC digest of any AUTH chunk in the packet.
3853          * - calculate and fill in the SCTP checksum.
3854          * - prepend an IP address header.
3855          * - if boundall use INADDR_ANY.
3856          * - if boundspecific do source address selection.
3857          * - set fragmentation option for ipV4.
3858          * - On return from IP output, check/adjust mtu size of output
3859          *   interface and smallest_mtu size as well.
3860          */
3861         /* Will need ifdefs around this */
3862         struct mbuf *newm;
3863         struct sctphdr *sctphdr;
3864         int packet_length;
3865         int ret;
3866
3867 #if defined(INET) || defined(INET6)
3868         uint32_t vrf_id;
3869
3870 #endif
3871 #if defined(INET) || defined(INET6)
3872         struct mbuf *o_pak;
3873         sctp_route_t *ro = NULL;
3874         struct udphdr *udp = NULL;
3875
3876 #endif
3877         uint8_t tos_value;
3878
3879 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3880         struct socket *so = NULL;
3881
3882 #endif
3883
3884         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3885                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3886                 sctp_m_freem(m);
3887                 return (EFAULT);
3888         }
3889 #if defined(INET) || defined(INET6)
3890         if (stcb) {
3891                 vrf_id = stcb->asoc.vrf_id;
3892         } else {
3893                 vrf_id = inp->def_vrf_id;
3894         }
3895 #endif
3896         /* fill in the HMAC digest for any AUTH chunk in the packet */
3897         if ((auth != NULL) && (stcb != NULL)) {
3898                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3899         }
3900         if (net) {
3901                 tos_value = net->dscp;
3902         } else if (stcb) {
3903                 tos_value = stcb->asoc.default_dscp;
3904         } else {
3905                 tos_value = inp->sctp_ep.default_dscp;
3906         }
3907
3908         switch (to->sa_family) {
3909 #ifdef INET
3910         case AF_INET:
3911                 {
3912                         struct ip *ip = NULL;
3913                         sctp_route_t iproute;
3914                         int len;
3915
3916                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3917                         if (port) {
3918                                 len += sizeof(struct udphdr);
3919                         }
3920                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
3921                         if (newm == NULL) {
3922                                 sctp_m_freem(m);
3923                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3924                                 return (ENOMEM);
3925                         }
3926                         SCTP_ALIGN_TO_END(newm, len);
3927                         SCTP_BUF_LEN(newm) = len;
3928                         SCTP_BUF_NEXT(newm) = m;
3929                         m = newm;
3930                         if (net != NULL) {
3931 #ifdef INVARIANTS
3932                                 if (net->flowidset == 0) {
3933                                         panic("Flow ID not set");
3934                                 }
3935 #endif
3936                                 m->m_pkthdr.flowid = net->flowid;
3937                                 m->m_flags |= M_FLOWID;
3938                         } else {
3939                                 if (use_mflowid != 0) {
3940                                         m->m_pkthdr.flowid = mflowid;
3941                                         m->m_flags |= M_FLOWID;
3942                                 }
3943                         }
3944                         packet_length = sctp_calculate_len(m);
3945                         ip = mtod(m, struct ip *);
3946                         ip->ip_v = IPVERSION;
3947                         ip->ip_hl = (sizeof(struct ip) >> 2);
3948                         if (tos_value == 0) {
3949                                 /*
3950                                  * This means especially, that it is not set
3951                                  * at the SCTP layer. So use the value from
3952                                  * the IP layer.
3953                                  */
3954                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3955                         }
3956                         tos_value &= 0xfc;
3957                         if (ecn_ok) {
3958                                 tos_value |= sctp_get_ect(stcb);
3959                         }
3960                         if ((nofragment_flag) && (port == 0)) {
3961                                 ip->ip_off = htons(IP_DF);
3962                         } else {
3963                                 ip->ip_off = htons(0);
3964                         }
3965                         /* FreeBSD has a function for ip_id's */
3966                         ip->ip_id = ip_newid();
3967
3968                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3969                         ip->ip_len = htons(packet_length);
3970                         ip->ip_tos = tos_value;
3971                         if (port) {
3972                                 ip->ip_p = IPPROTO_UDP;
3973                         } else {
3974                                 ip->ip_p = IPPROTO_SCTP;
3975                         }
3976                         ip->ip_sum = 0;
3977                         if (net == NULL) {
3978                                 ro = &iproute;
3979                                 memset(&iproute, 0, sizeof(iproute));
3980                                 memcpy(&ro->ro_dst, to, to->sa_len);
3981                         } else {
3982                                 ro = (sctp_route_t *) & net->ro;
3983                         }
3984                         /* Now the address selection part */
3985                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3986
3987                         /* call the routine to select the src address */
3988                         if (net && out_of_asoc_ok == 0) {
3989                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3990                                         sctp_free_ifa(net->ro._s_addr);
3991                                         net->ro._s_addr = NULL;
3992                                         net->src_addr_selected = 0;
3993                                         if (ro->ro_rt) {
3994                                                 RTFREE(ro->ro_rt);
3995                                                 ro->ro_rt = NULL;
3996                                         }
3997                                 }
3998                                 if (net->src_addr_selected == 0) {
3999                                         /* Cache the source address */
4000                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4001                                             ro, net, 0,
4002                                             vrf_id);
4003                                         net->src_addr_selected = 1;
4004                                 }
4005                                 if (net->ro._s_addr == NULL) {
4006                                         /* No route to host */
4007                                         net->src_addr_selected = 0;
4008                                         sctp_handle_no_route(stcb, net, so_locked);
4009                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4010                                         sctp_m_freem(m);
4011                                         return (EHOSTUNREACH);
4012                                 }
4013                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4014                         } else {
4015                                 if (over_addr == NULL) {
4016                                         struct sctp_ifa *_lsrc;
4017
4018                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4019                                             net,
4020                                             out_of_asoc_ok,
4021                                             vrf_id);
4022                                         if (_lsrc == NULL) {
4023                                                 sctp_handle_no_route(stcb, net, so_locked);
4024                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4025                                                 sctp_m_freem(m);
4026                                                 return (EHOSTUNREACH);
4027                                         }
4028                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4029                                         sctp_free_ifa(_lsrc);
4030                                 } else {
4031                                         ip->ip_src = over_addr->sin.sin_addr;
4032                                         SCTP_RTALLOC(ro, vrf_id);
4033                                 }
4034                         }
4035                         if (port) {
4036                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4037                                         sctp_handle_no_route(stcb, net, so_locked);
4038                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4039                                         sctp_m_freem(m);
4040                                         return (EHOSTUNREACH);
4041                                 }
4042                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4043                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4044                                 udp->uh_dport = port;
4045                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4046                                 if (V_udp_cksum) {
4047                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4048                                 } else {
4049                                         udp->uh_sum = 0;
4050                                 }
4051                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4052                         } else {
4053                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4054                         }
4055
4056                         sctphdr->src_port = src_port;
4057                         sctphdr->dest_port = dest_port;
4058                         sctphdr->v_tag = v_tag;
4059                         sctphdr->checksum = 0;
4060
4061                         /*
4062                          * If source address selection fails and we find no
4063                          * route then the ip_output should fail as well with
4064                          * a NO_ROUTE_TO_HOST type error. We probably should
4065                          * catch that somewhere and abort the association
4066                          * right away (assuming this is an INIT being sent).
4067                          */
4068                         if (ro->ro_rt == NULL) {
4069                                 /*
4070                                  * src addr selection failed to find a route
4071                                  * (or valid source addr), so we can't get
4072                                  * there from here (yet)!
4073                                  */
4074                                 sctp_handle_no_route(stcb, net, so_locked);
4075                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4076                                 sctp_m_freem(m);
4077                                 return (EHOSTUNREACH);
4078                         }
4079                         if (ro != &iproute) {
4080                                 memcpy(&iproute, ro, sizeof(*ro));
4081                         }
4082                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4083                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4084                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4085                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4086                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4087                             (void *)ro->ro_rt);
4088
4089                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4090                                 /* failed to prepend data, give up */
4091                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4092                                 sctp_m_freem(m);
4093                                 return (ENOMEM);
4094                         }
4095                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4096                         if (port) {
4097 #if defined(SCTP_WITH_NO_CSUM)
4098                                 SCTP_STAT_INCR(sctps_sendnocrc);
4099 #else
4100                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4101                                 SCTP_STAT_INCR(sctps_sendswcrc);
4102 #endif
4103                                 if (V_udp_cksum) {
4104                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4105                                 }
4106                         } else {
4107 #if defined(SCTP_WITH_NO_CSUM)
4108                                 SCTP_STAT_INCR(sctps_sendnocrc);
4109 #else
4110                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4111                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4112                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4113 #endif
4114                         }
4115 #ifdef SCTP_PACKET_LOGGING
4116                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4117                                 sctp_packet_log(o_pak);
4118 #endif
4119                         /* send it out.  table id is taken from stcb */
4120 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4121                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4122                                 so = SCTP_INP_SO(inp);
4123                                 SCTP_SOCKET_UNLOCK(so, 0);
4124                         }
4125 #endif
4126                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4127 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4128                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4129                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4130                                 SCTP_TCB_UNLOCK(stcb);
4131                                 SCTP_SOCKET_LOCK(so, 0);
4132                                 SCTP_TCB_LOCK(stcb);
4133                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4134                         }
4135 #endif
4136                         SCTP_STAT_INCR(sctps_sendpackets);
4137                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4138                         if (ret)
4139                                 SCTP_STAT_INCR(sctps_senderrors);
4140
4141                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4142                         if (net == NULL) {
4143                                 /* free tempy routes */
4144                                 RO_RTFREE(ro);
4145                         } else {
4146                                 /*
4147                                  * PMTU check versus smallest asoc MTU goes
4148                                  * here
4149                                  */
4150                                 if ((ro->ro_rt != NULL) &&
4151                                     (net->ro._s_addr)) {
4152                                         uint32_t mtu;
4153
4154                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4155                                         if (net->port) {
4156                                                 mtu -= sizeof(struct udphdr);
4157                                         }
4158                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4159                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4160                                                 net->mtu = mtu;
4161                                         }
4162                                 } else if (ro->ro_rt == NULL) {
4163                                         /* route was freed */
4164                                         if (net->ro._s_addr &&
4165                                             net->src_addr_selected) {
4166                                                 sctp_free_ifa(net->ro._s_addr);
4167                                                 net->ro._s_addr = NULL;
4168                                         }
4169                                         net->src_addr_selected = 0;
4170                                 }
4171                         }
4172                         return (ret);
4173                 }
4174 #endif
4175 #ifdef INET6
4176         case AF_INET6:
4177                 {
4178                         uint32_t flowlabel, flowinfo;
4179                         struct ip6_hdr *ip6h;
4180                         struct route_in6 ip6route;
4181                         struct ifnet *ifp;
4182                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4183                         int prev_scope = 0;
4184                         struct sockaddr_in6 lsa6_storage;
4185                         int error;
4186                         u_short prev_port = 0;
4187                         int len;
4188
4189                         if (net) {
4190                                 flowlabel = net->flowlabel;
4191                         } else if (stcb) {
4192                                 flowlabel = stcb->asoc.default_flowlabel;
4193                         } else {
4194                                 flowlabel = inp->sctp_ep.default_flowlabel;
4195                         }
4196                         if (flowlabel == 0) {
4197                                 /*
4198                                  * This means especially, that it is not set
4199                                  * at the SCTP layer. So use the value from
4200                                  * the IP layer.
4201                                  */
4202                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4203                         }
4204                         flowlabel &= 0x000fffff;
4205                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4206                         if (port) {
4207                                 len += sizeof(struct udphdr);
4208                         }
4209                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4210                         if (newm == NULL) {
4211                                 sctp_m_freem(m);
4212                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4213                                 return (ENOMEM);
4214                         }
4215                         SCTP_ALIGN_TO_END(newm, len);
4216                         SCTP_BUF_LEN(newm) = len;
4217                         SCTP_BUF_NEXT(newm) = m;
4218                         m = newm;
4219                         if (net != NULL) {
4220 #ifdef INVARIANTS
4221                                 if (net->flowidset == 0) {
4222                                         panic("Flow ID not set");
4223                                 }
4224 #endif
4225                                 m->m_pkthdr.flowid = net->flowid;
4226                                 m->m_flags |= M_FLOWID;
4227                         } else {
4228                                 if (use_mflowid != 0) {
4229                                         m->m_pkthdr.flowid = mflowid;
4230                                         m->m_flags |= M_FLOWID;
4231                                 }
4232                         }
4233                         packet_length = sctp_calculate_len(m);
4234
4235                         ip6h = mtod(m, struct ip6_hdr *);
4236                         /* protect *sin6 from overwrite */
4237                         sin6 = (struct sockaddr_in6 *)to;
4238                         tmp = *sin6;
4239                         sin6 = &tmp;
4240
4241                         /* KAME hack: embed scopeid */
4242                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4243                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4244                                 return (EINVAL);
4245                         }
4246                         if (net == NULL) {
4247                                 memset(&ip6route, 0, sizeof(ip6route));
4248                                 ro = (sctp_route_t *) & ip6route;
4249                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4250                         } else {
4251                                 ro = (sctp_route_t *) & net->ro;
4252                         }
4253                         /*
4254                          * We assume here that inp_flow is in host byte
4255                          * order within the TCB!
4256                          */
4257                         if (tos_value == 0) {
4258                                 /*
4259                                  * This means especially, that it is not set
4260                                  * at the SCTP layer. So use the value from
4261                                  * the IP layer.
4262                                  */
4263                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4264                         }
4265                         tos_value &= 0xfc;
4266                         if (ecn_ok) {
4267                                 tos_value |= sctp_get_ect(stcb);
4268                         }
4269                         flowinfo = 0x06;
4270                         flowinfo <<= 8;
4271                         flowinfo |= tos_value;
4272                         flowinfo <<= 20;
4273                         flowinfo |= flowlabel;
4274                         ip6h->ip6_flow = htonl(flowinfo);
4275                         if (port) {
4276                                 ip6h->ip6_nxt = IPPROTO_UDP;
4277                         } else {
4278                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4279                         }
4280                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4281                         ip6h->ip6_dst = sin6->sin6_addr;
4282
4283                         /*
4284                          * Add SRC address selection here: we can only reuse
4285                          * to a limited degree the kame src-addr-sel, since
4286                          * we can try their selection but it may not be
4287                          * bound.
4288                          */
4289                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4290                         lsa6_tmp.sin6_family = AF_INET6;
4291                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4292                         lsa6 = &lsa6_tmp;
4293                         if (net && out_of_asoc_ok == 0) {
4294                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4295                                         sctp_free_ifa(net->ro._s_addr);
4296                                         net->ro._s_addr = NULL;
4297                                         net->src_addr_selected = 0;
4298                                         if (ro->ro_rt) {
4299                                                 RTFREE(ro->ro_rt);
4300                                                 ro->ro_rt = NULL;
4301                                         }
4302                                 }
4303                                 if (net->src_addr_selected == 0) {
4304                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4305                                         /* KAME hack: embed scopeid */
4306                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4307                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4308                                                 return (EINVAL);
4309                                         }
4310                                         /* Cache the source address */
4311                                         net->ro._s_addr = sctp_source_address_selection(inp,
4312                                             stcb,
4313                                             ro,
4314                                             net,
4315                                             0,
4316                                             vrf_id);
4317                                         (void)sa6_recoverscope(sin6);
4318                                         net->src_addr_selected = 1;
4319                                 }
4320                                 if (net->ro._s_addr == NULL) {
4321                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4322                                         net->src_addr_selected = 0;
4323                                         sctp_handle_no_route(stcb, net, so_locked);
4324                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4325                                         sctp_m_freem(m);
4326                                         return (EHOSTUNREACH);
4327                                 }
4328                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4329                         } else {
4330                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4331                                 /* KAME hack: embed scopeid */
4332                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4333                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4334                                         return (EINVAL);
4335                                 }
4336                                 if (over_addr == NULL) {
4337                                         struct sctp_ifa *_lsrc;
4338
4339                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4340                                             net,
4341                                             out_of_asoc_ok,
4342                                             vrf_id);
4343                                         if (_lsrc == NULL) {
4344                                                 sctp_handle_no_route(stcb, net, so_locked);
4345                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4346                                                 sctp_m_freem(m);
4347                                                 return (EHOSTUNREACH);
4348                                         }
4349                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4350                                         sctp_free_ifa(_lsrc);
4351                                 } else {
4352                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4353                                         SCTP_RTALLOC(ro, vrf_id);
4354                                 }
4355                                 (void)sa6_recoverscope(sin6);
4356                         }
4357                         lsa6->sin6_port = inp->sctp_lport;
4358
4359                         if (ro->ro_rt == NULL) {
4360                                 /*
4361                                  * src addr selection failed to find a route
4362                                  * (or valid source addr), so we can't get
4363                                  * there from here!
4364                                  */
4365                                 sctp_handle_no_route(stcb, net, so_locked);
4366                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4367                                 sctp_m_freem(m);
4368                                 return (EHOSTUNREACH);
4369                         }
4370                         /*
4371                          * XXX: sa6 may not have a valid sin6_scope_id in
4372                          * the non-SCOPEDROUTING case.
4373                          */
4374                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4375                         lsa6_storage.sin6_family = AF_INET6;
4376                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4377                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4378                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4379                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4380                                 sctp_m_freem(m);
4381                                 return (error);
4382                         }
4383                         /* XXX */
4384                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4385                         lsa6_storage.sin6_port = inp->sctp_lport;
4386                         lsa6 = &lsa6_storage;
4387                         ip6h->ip6_src = lsa6->sin6_addr;
4388
4389                         if (port) {
4390                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4391                                         sctp_handle_no_route(stcb, net, so_locked);
4392                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4393                                         sctp_m_freem(m);
4394                                         return (EHOSTUNREACH);
4395                                 }
4396                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4397                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4398                                 udp->uh_dport = port;
4399                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4400                                 udp->uh_sum = 0;
4401                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4402                         } else {
4403                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4404                         }
4405
4406                         sctphdr->src_port = src_port;
4407                         sctphdr->dest_port = dest_port;
4408                         sctphdr->v_tag = v_tag;
4409                         sctphdr->checksum = 0;
4410
4411                         /*
4412                          * We set the hop limit now since there is a good
4413                          * chance that our ro pointer is now filled
4414                          */
4415                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4416                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4417
4418 #ifdef SCTP_DEBUG
4419                         /* Copy to be sure something bad is not happening */
4420                         sin6->sin6_addr = ip6h->ip6_dst;
4421                         lsa6->sin6_addr = ip6h->ip6_src;
4422 #endif
4423
4424                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4425                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4426                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4427                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4428                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4429                         if (net) {
4430                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4431                                 /*
4432                                  * preserve the port and scope for link
4433                                  * local send
4434                                  */
4435                                 prev_scope = sin6->sin6_scope_id;
4436                                 prev_port = sin6->sin6_port;
4437                         }
4438                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4439                                 /* failed to prepend data, give up */
4440                                 sctp_m_freem(m);
4441                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4442                                 return (ENOMEM);
4443                         }
4444                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4445                         if (port) {
4446 #if defined(SCTP_WITH_NO_CSUM)
4447                                 SCTP_STAT_INCR(sctps_sendnocrc);
4448 #else
4449                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4450                                 SCTP_STAT_INCR(sctps_sendswcrc);
4451 #endif
4452                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4453                                         udp->uh_sum = 0xffff;
4454                                 }
4455                         } else {
4456 #if defined(SCTP_WITH_NO_CSUM)
4457                                 SCTP_STAT_INCR(sctps_sendnocrc);
4458 #else
4459                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4460                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4461                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4462 #endif
4463                         }
4464                         /* send it out. table id is taken from stcb */
4465 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4466                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4467                                 so = SCTP_INP_SO(inp);
4468                                 SCTP_SOCKET_UNLOCK(so, 0);
4469                         }
4470 #endif
4471 #ifdef SCTP_PACKET_LOGGING
4472                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4473                                 sctp_packet_log(o_pak);
4474 #endif
4475                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4476 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4477                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4478                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4479                                 SCTP_TCB_UNLOCK(stcb);
4480                                 SCTP_SOCKET_LOCK(so, 0);
4481                                 SCTP_TCB_LOCK(stcb);
4482                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4483                         }
4484 #endif
4485                         if (net) {
4486                                 /* for link local this must be done */
4487                                 sin6->sin6_scope_id = prev_scope;
4488                                 sin6->sin6_port = prev_port;
4489                         }
4490                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4491                         SCTP_STAT_INCR(sctps_sendpackets);
4492                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4493                         if (ret) {
4494                                 SCTP_STAT_INCR(sctps_senderrors);
4495                         }
4496                         if (net == NULL) {
4497                                 /* Now if we had a temp route free it */
4498                                 RO_RTFREE(ro);
4499                         } else {
4500                                 /*
4501                                  * PMTU check versus smallest asoc MTU goes
4502                                  * here
4503                                  */
4504                                 if (ro->ro_rt == NULL) {
4505                                         /* Route was freed */
4506                                         if (net->ro._s_addr &&
4507                                             net->src_addr_selected) {
4508                                                 sctp_free_ifa(net->ro._s_addr);
4509                                                 net->ro._s_addr = NULL;
4510                                         }
4511                                         net->src_addr_selected = 0;
4512                                 }
4513                                 if ((ro->ro_rt != NULL) &&
4514                                     (net->ro._s_addr)) {
4515                                         uint32_t mtu;
4516
4517                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4518                                         if (mtu &&
4519                                             (stcb->asoc.smallest_mtu > mtu)) {
4520                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4521                                                 net->mtu = mtu;
4522                                                 if (net->port) {
4523                                                         net->mtu -= sizeof(struct udphdr);
4524                                                 }
4525                                         }
4526                                 } else if (ifp) {
4527                                         if (ND_IFINFO(ifp)->linkmtu &&
4528                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4529                                                 sctp_mtu_size_reset(inp,
4530                                                     &stcb->asoc,
4531                                                     ND_IFINFO(ifp)->linkmtu);
4532                                         }
4533                                 }
4534                         }
4535                         return (ret);
4536                 }
4537 #endif
4538         default:
4539                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4540                     ((struct sockaddr *)to)->sa_family);
4541                 sctp_m_freem(m);
4542                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4543                 return (EFAULT);
4544         }
4545 }
4546
4547
4548 void
4549 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4550 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4551     SCTP_UNUSED
4552 #endif
4553 )
4554 {
4555         struct mbuf *m;
4556         struct sctp_nets *net;
4557         struct sctp_init_chunk *init;
4558         struct sctp_supported_addr_param *sup_addr;
4559         struct sctp_adaptation_layer_indication *ali;
4560         struct sctp_supported_chunk_types_param *pr_supported;
4561         struct sctp_paramhdr *ph;
4562         int cnt_inits_to = 0;
4563         int ret;
4564         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4565
4566         /* INIT's always go to the primary (and usually ONLY address) */
4567         net = stcb->asoc.primary_destination;
4568         if (net == NULL) {
4569                 net = TAILQ_FIRST(&stcb->asoc.nets);
4570                 if (net == NULL) {
4571                         /* TSNH */
4572                         return;
4573                 }
4574                 /* we confirm any address we send an INIT to */
4575                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4576                 (void)sctp_set_primary_addr(stcb, NULL, net);
4577         } else {
4578                 /* we confirm any address we send an INIT to */
4579                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4580         }
4581         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4582 #ifdef INET6
4583         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4584                 /*
4585                  * special hook, if we are sending to link local it will not
4586                  * show up in our private address count.
4587                  */
4588                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4589                         cnt_inits_to = 1;
4590         }
4591 #endif
4592         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4593                 /* This case should not happen */
4594                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4595                 return;
4596         }
4597         /* start the INIT timer */
4598         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4599
4600         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4601         if (m == NULL) {
4602                 /* No memory, INIT timer will re-attempt. */
4603                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4604                 return;
4605         }
4606         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4607         padding_len = 0;
4608         /*
4609          * assume peer supports asconf in order to be able to queue local
4610          * address changes while an INIT is in flight and before the assoc
4611          * is established.
4612          */
4613         stcb->asoc.peer_supports_asconf = 1;
4614         /* Now lets put the chunk header in place */
4615         init = mtod(m, struct sctp_init_chunk *);
4616         /* now the chunk header */
4617         init->ch.chunk_type = SCTP_INITIATION;
4618         init->ch.chunk_flags = 0;
4619         /* fill in later from mbuf we build */
4620         init->ch.chunk_length = 0;
4621         /* place in my tag */
4622         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4623         /* set up some of the credits. */
4624         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4625             SCTP_MINIMAL_RWND));
4626         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4627         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4628         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4629
4630         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4631                 uint8_t i;
4632
4633                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4634                 if (stcb->asoc.scope.ipv4_addr_legal) {
4635                         parameter_len += (uint16_t) sizeof(uint16_t);
4636                 }
4637                 if (stcb->asoc.scope.ipv6_addr_legal) {
4638                         parameter_len += (uint16_t) sizeof(uint16_t);
4639                 }
4640                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4641                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4642                 sup_addr->ph.param_length = htons(parameter_len);
4643                 i = 0;
4644                 if (stcb->asoc.scope.ipv4_addr_legal) {
4645                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4646                 }
4647                 if (stcb->asoc.scope.ipv6_addr_legal) {
4648                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4649                 }
4650                 padding_len = 4 - 2 * i;
4651                 chunk_len += parameter_len;
4652         }
4653         /* Adaptation layer indication parameter */
4654         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4655                 if (padding_len > 0) {
4656                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4657                         chunk_len += padding_len;
4658                         padding_len = 0;
4659                 }
4660                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4661                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4662                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4663                 ali->ph.param_length = htons(parameter_len);
4664                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4665                 chunk_len += parameter_len;
4666         }
4667         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4668                 /* Add NAT friendly parameter. */
4669                 if (padding_len > 0) {
4670                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4671                         chunk_len += padding_len;
4672                         padding_len = 0;
4673                 }
4674                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4675                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4676                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4677                 ph->param_length = htons(parameter_len);
4678                 chunk_len += parameter_len;
4679         }
4680         /* now any cookie time extensions */
4681         if (stcb->asoc.cookie_preserve_req) {
4682                 struct sctp_cookie_perserve_param *cookie_preserve;
4683
4684                 if (padding_len > 0) {
4685                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4686                         chunk_len += padding_len;
4687                         padding_len = 0;
4688                 }
4689                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4690                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4691                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4692                 cookie_preserve->ph.param_length = htons(parameter_len);
4693                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4694                 stcb->asoc.cookie_preserve_req = 0;
4695                 chunk_len += parameter_len;
4696         }
4697         /* ECN parameter */
4698         if (stcb->asoc.ecn_allowed == 1) {
4699                 if (padding_len > 0) {
4700                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4701                         chunk_len += padding_len;
4702                         padding_len = 0;
4703                 }
4704                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4705                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4706                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4707                 ph->param_length = htons(parameter_len);
4708                 chunk_len += parameter_len;
4709         }
4710         /* And now tell the peer we do support PR-SCTP. */
4711         if (padding_len > 0) {
4712                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4713                 chunk_len += padding_len;
4714                 padding_len = 0;
4715         }
4716         parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4717         ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4718         ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4719         ph->param_length = htons(parameter_len);
4720         chunk_len += parameter_len;
4721
4722         /* And now tell the peer we do all the extensions */
4723         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4724         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4725         num_ext = 0;
4726         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4727         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4728         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4729         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4730         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4731         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4732                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4733         }
4734         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4735                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4736         }
4737         parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4738         pr_supported->ph.param_length = htons(parameter_len);
4739         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4740         chunk_len += parameter_len;
4741
4742         /* add authentication parameters */
4743         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4744                 /* attach RANDOM parameter, if available */
4745                 if (stcb->asoc.authinfo.random != NULL) {
4746                         struct sctp_auth_random *randp;
4747
4748                         if (padding_len > 0) {
4749                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4750                                 chunk_len += padding_len;
4751                                 padding_len = 0;
4752                         }
4753                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4754                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4755                         /* random key already contains the header */
4756                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4757                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4758                         chunk_len += parameter_len;
4759                 }
4760                 /* add HMAC_ALGO parameter */
4761                 if ((stcb->asoc.local_hmacs != NULL) &&
4762                     (stcb->asoc.local_hmacs->num_algo > 0)) {
4763                         struct sctp_auth_hmac_algo *hmacs;
4764
4765                         if (padding_len > 0) {
4766                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4767                                 chunk_len += padding_len;
4768                                 padding_len = 0;
4769                         }
4770                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4771                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4772                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4773                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4774                         hmacs->ph.param_length = htons(parameter_len);
4775                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4776                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4777                         chunk_len += parameter_len;
4778                 }
4779                 /* add CHUNKS parameter */
4780                 if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4781                         struct sctp_auth_chunk_list *chunks;
4782
4783                         if (padding_len > 0) {
4784                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4785                                 chunk_len += padding_len;
4786                                 padding_len = 0;
4787                         }
4788                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4789                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4790                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4791                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4792                         chunks->ph.param_length = htons(parameter_len);
4793                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4794                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4795                         chunk_len += parameter_len;
4796                 }
4797         }
4798         SCTP_BUF_LEN(m) = chunk_len;
4799
4800         /* now the addresses */
4801         /*
4802          * To optimize this we could put the scoping stuff into a structure
4803          * and remove the individual uint8's from the assoc structure. Then
4804          * we could just sifa in the address within the stcb. But for now
4805          * this is a quick hack to get the address stuff teased apart.
4806          */
4807         sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope, m, cnt_inits_to, &padding_len, &chunk_len);
4808
4809         init->ch.chunk_length = htons(chunk_len);
4810         if (padding_len > 0) {
4811                 struct mbuf *m_at, *mp_last;
4812
4813                 mp_last = NULL;
4814                 for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4815                         if (SCTP_BUF_NEXT(m_at) == NULL)
4816                                 mp_last = m_at;
4817                 }
4818                 if ((mp_last == NULL) || sctp_add_pad_tombuf(mp_last, padding_len)) {
4819                         sctp_m_freem(m);
4820                         return;
4821                 }
4822         }
4823         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4824         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4825             (struct sockaddr *)&net->ro._l_addr,
4826             m, 0, NULL, 0, 0, 0, 0,
4827             inp->sctp_lport, stcb->rport, htonl(0),
4828             net->port, NULL,
4829             0, 0,
4830             so_locked);
4831         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4832         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4833         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4834 }
4835
4836 struct mbuf *
4837 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4838     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4839 {
4840         /*
4841          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4842          * being equal to the beginning of the params i.e. (iphlen +
4843          * sizeof(struct sctp_init_msg) parse through the parameters to the
4844          * end of the mbuf verifying that all parameters are known.
4845          *
4846          * For unknown parameters build and return a mbuf with
4847          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4848          * processing this chunk stop, and set *abort_processing to 1.
4849          *
4850          * By having param_offset be pre-set to where parameters begin it is
4851          * hoped that this routine may be reused in the future by new
4852          * features.
4853          */
4854         struct sctp_paramhdr *phdr, params;
4855
4856         struct mbuf *mat, *op_err;
4857         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4858         int at, limit, pad_needed;
4859         uint16_t ptype, plen, padded_size;
4860         int err_at;
4861
4862         *abort_processing = 0;
4863         mat = in_initpkt;
4864         err_at = 0;
4865         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4866         at = param_offset;
4867         op_err = NULL;
4868         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4869         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4870         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4871                 ptype = ntohs(phdr->param_type);
4872                 plen = ntohs(phdr->param_length);
4873                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4874                         /* wacked parameter */
4875                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4876                         goto invalid_size;
4877                 }
4878                 limit -= SCTP_SIZE32(plen);
4879                 /*-
4880                  * All parameters for all chunks that we know/understand are
4881                  * listed here. We process them other places and make
4882                  * appropriate stop actions per the upper bits. However this
4883                  * is the generic routine processor's can call to get back
4884                  * an operr.. to either incorporate (init-ack) or send.
4885                  */
4886                 padded_size = SCTP_SIZE32(plen);
4887                 switch (ptype) {
4888                         /* Param's with variable size */
4889                 case SCTP_HEARTBEAT_INFO:
4890                 case SCTP_STATE_COOKIE:
4891                 case SCTP_UNRECOG_PARAM:
4892                 case SCTP_ERROR_CAUSE_IND:
4893                         /* ok skip fwd */
4894                         at += padded_size;
4895                         break;
4896                         /* Param's with variable size within a range */
4897                 case SCTP_CHUNK_LIST:
4898                 case SCTP_SUPPORTED_CHUNK_EXT:
4899                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4900                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4901                                 goto invalid_size;
4902                         }
4903                         at += padded_size;
4904                         break;
4905                 case SCTP_SUPPORTED_ADDRTYPE:
4906                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4907                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4908                                 goto invalid_size;
4909                         }
4910                         at += padded_size;
4911                         break;
4912                 case SCTP_RANDOM:
4913                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4914                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4915                                 goto invalid_size;
4916                         }
4917                         at += padded_size;
4918                         break;
4919                 case SCTP_SET_PRIM_ADDR:
4920                 case SCTP_DEL_IP_ADDRESS:
4921                 case SCTP_ADD_IP_ADDRESS:
4922                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4923                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4924                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4925                                 goto invalid_size;
4926                         }
4927                         at += padded_size;
4928                         break;
4929                         /* Param's with a fixed size */
4930                 case SCTP_IPV4_ADDRESS:
4931                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4932                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4933                                 goto invalid_size;
4934                         }
4935                         at += padded_size;
4936                         break;
4937                 case SCTP_IPV6_ADDRESS:
4938                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4939                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4940                                 goto invalid_size;
4941                         }
4942                         at += padded_size;
4943                         break;
4944                 case SCTP_COOKIE_PRESERVE:
4945                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4946                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4947                                 goto invalid_size;
4948                         }
4949                         at += padded_size;
4950                         break;
4951                 case SCTP_HAS_NAT_SUPPORT:
4952                         *nat_friendly = 1;
4953                         /* fall through */
4954                 case SCTP_PRSCTP_SUPPORTED:
4955
4956                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4957                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4958                                 goto invalid_size;
4959                         }
4960                         at += padded_size;
4961                         break;
4962                 case SCTP_ECN_CAPABLE:
4963                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4964                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4965                                 goto invalid_size;
4966                         }
4967                         at += padded_size;
4968                         break;
4969                 case SCTP_ULP_ADAPTATION:
4970                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4971                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4972                                 goto invalid_size;
4973                         }
4974                         at += padded_size;
4975                         break;
4976                 case SCTP_SUCCESS_REPORT:
4977                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4978                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4979                                 goto invalid_size;
4980                         }
4981                         at += padded_size;
4982                         break;
4983                 case SCTP_HOSTNAME_ADDRESS:
4984                         {
4985                                 /* We can NOT handle HOST NAME addresses!! */
4986                                 int l_len;
4987
4988                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4989                                 *abort_processing = 1;
4990                                 if (op_err == NULL) {
4991                                         /* Ok need to try to get a mbuf */
4992 #ifdef INET6
4993                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4994 #else
4995                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4996 #endif
4997                                         l_len += plen;
4998                                         l_len += sizeof(struct sctp_paramhdr);
4999                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5000                                         if (op_err) {
5001                                                 SCTP_BUF_LEN(op_err) = 0;
5002                                                 /*
5003                                                  * pre-reserve space for ip
5004                                                  * and sctp header  and
5005                                                  * chunk hdr
5006                                                  */
5007 #ifdef INET6
5008                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5009 #else
5010                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5011 #endif
5012                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5013                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5014                                         }
5015                                 }
5016                                 if (op_err) {
5017                                         /* If we have space */
5018                                         struct sctp_paramhdr s;
5019
5020                                         if (err_at % 4) {
5021                                                 uint32_t cpthis = 0;
5022
5023                                                 pad_needed = 4 - (err_at % 4);
5024                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5025                                                 err_at += pad_needed;
5026                                         }
5027                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5028                                         s.param_length = htons(sizeof(s) + plen);
5029                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5030                                         err_at += sizeof(s);
5031                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5032                                         if (phdr == NULL) {
5033                                                 sctp_m_freem(op_err);
5034                                                 /*
5035                                                  * we are out of memory but
5036                                                  * we still need to have a
5037                                                  * look at what to do (the
5038                                                  * system is in trouble
5039                                                  * though).
5040                                                  */
5041                                                 return (NULL);
5042                                         }
5043                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5044                                 }
5045                                 return (op_err);
5046                                 break;
5047                         }
5048                 default:
5049                         /*
5050                          * we do not recognize the parameter figure out what
5051                          * we do.
5052                          */
5053                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5054                         if ((ptype & 0x4000) == 0x4000) {
5055                                 /* Report bit is set?? */
5056                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5057                                 if (op_err == NULL) {
5058                                         int l_len;
5059
5060                                         /* Ok need to try to get an mbuf */
5061 #ifdef INET6
5062                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5063 #else
5064                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5065 #endif
5066                                         l_len += plen;
5067                                         l_len += sizeof(struct sctp_paramhdr);
5068                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5069                                         if (op_err) {
5070                                                 SCTP_BUF_LEN(op_err) = 0;
5071 #ifdef INET6
5072                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5073 #else
5074                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5075 #endif
5076                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5077                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5078                                         }
5079                                 }
5080                                 if (op_err) {
5081                                         /* If we have space */
5082                                         struct sctp_paramhdr s;
5083
5084                                         if (err_at % 4) {
5085                                                 uint32_t cpthis = 0;
5086
5087                                                 pad_needed = 4 - (err_at % 4);
5088                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5089                                                 err_at += pad_needed;
5090                                         }
5091                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5092                                         s.param_length = htons(sizeof(s) + plen);
5093                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5094                                         err_at += sizeof(s);
5095                                         if (plen > sizeof(tempbuf)) {
5096                                                 plen = sizeof(tempbuf);
5097                                         }
5098                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5099                                         if (phdr == NULL) {
5100                                                 sctp_m_freem(op_err);
5101                                                 /*
5102                                                  * we are out of memory but
5103                                                  * we still need to have a
5104                                                  * look at what to do (the
5105                                                  * system is in trouble
5106                                                  * though).
5107                                                  */
5108                                                 op_err = NULL;
5109                                                 goto more_processing;
5110                                         }
5111                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5112                                         err_at += plen;
5113                                 }
5114                         }
5115         more_processing:
5116                         if ((ptype & 0x8000) == 0x0000) {
5117                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5118                                 return (op_err);
5119                         } else {
5120                                 /* skip this chunk and continue processing */
5121                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5122                                 at += SCTP_SIZE32(plen);
5123                         }
5124                         break;
5125
5126                 }
5127                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5128         }
5129         return (op_err);
5130 invalid_size:
5131         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5132         *abort_processing = 1;
5133         if ((op_err == NULL) && phdr) {
5134                 int l_len;
5135
5136 #ifdef INET6
5137                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5138 #else
5139                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5140 #endif
5141                 l_len += (2 * sizeof(struct sctp_paramhdr));
5142                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5143                 if (op_err) {
5144                         SCTP_BUF_LEN(op_err) = 0;
5145 #ifdef INET6
5146                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5147 #else
5148                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5149 #endif
5150                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5151                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5152                 }
5153         }
5154         if ((op_err) && phdr) {
5155                 struct sctp_paramhdr s;
5156
5157                 if (err_at % 4) {
5158                         uint32_t cpthis = 0;
5159
5160                         pad_needed = 4 - (err_at % 4);
5161                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5162                         err_at += pad_needed;
5163                 }
5164                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5165                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5166                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5167                 err_at += sizeof(s);
5168                 /* Only copy back the p-hdr that caused the issue */
5169                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5170         }
5171         return (op_err);
5172 }
5173
5174 static int
5175 sctp_are_there_new_addresses(struct sctp_association *asoc,
5176     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5177 {
5178         /*
5179          * Given a INIT packet, look through the packet to verify that there
5180          * are NO new addresses. As we go through the parameters add reports
5181          * of any un-understood parameters that require an error.  Also we
5182          * must return (1) to drop the packet if we see a un-understood
5183          * parameter that tells us to drop the chunk.
5184          */
5185         struct sockaddr *sa_touse;
5186         struct sockaddr *sa;
5187         struct sctp_paramhdr *phdr, params;
5188         uint16_t ptype, plen;
5189         uint8_t fnd;
5190         struct sctp_nets *net;
5191
5192 #ifdef INET
5193         struct sockaddr_in sin4, *sa4;
5194
5195 #endif
5196 #ifdef INET6
5197         struct sockaddr_in6 sin6, *sa6;
5198
5199 #endif
5200
5201 #ifdef INET
5202         memset(&sin4, 0, sizeof(sin4));
5203         sin4.sin_family = AF_INET;
5204         sin4.sin_len = sizeof(sin4);
5205 #endif
5206 #ifdef INET6
5207         memset(&sin6, 0, sizeof(sin6));
5208         sin6.sin6_family = AF_INET6;
5209         sin6.sin6_len = sizeof(sin6);
5210 #endif
5211         /* First what about the src address of the pkt ? */
5212         fnd = 0;
5213         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5214                 sa = (struct sockaddr *)&net->ro._l_addr;
5215                 if (sa->sa_family == src->sa_family) {
5216 #ifdef INET
5217                         if (sa->sa_family == AF_INET) {
5218                                 struct sockaddr_in *src4;
5219
5220                                 sa4 = (struct sockaddr_in *)sa;
5221                                 src4 = (struct sockaddr_in *)src;
5222                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5223                                         fnd = 1;
5224                                         break;
5225                                 }
5226                         }
5227 #endif
5228 #ifdef INET6
5229                         if (sa->sa_family == AF_INET6) {
5230                                 struct sockaddr_in6 *src6;
5231
5232                                 sa6 = (struct sockaddr_in6 *)sa;
5233                                 src6 = (struct sockaddr_in6 *)src;
5234                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5235                                         fnd = 1;
5236                                         break;
5237                                 }
5238                         }
5239 #endif
5240                 }
5241         }
5242         if (fnd == 0) {
5243                 /* New address added! no need to look futher. */
5244                 return (1);
5245         }
5246         /* Ok so far lets munge through the rest of the packet */
5247         offset += sizeof(struct sctp_init_chunk);
5248         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5249         while (phdr) {
5250                 sa_touse = NULL;
5251                 ptype = ntohs(phdr->param_type);
5252                 plen = ntohs(phdr->param_length);
5253                 switch (ptype) {
5254 #ifdef INET
5255                 case SCTP_IPV4_ADDRESS:
5256                         {
5257                                 struct sctp_ipv4addr_param *p4, p4_buf;
5258
5259                                 phdr = sctp_get_next_param(in_initpkt, offset,
5260                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5261                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5262                                     phdr == NULL) {
5263                                         return (1);
5264                                 }
5265                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5266                                 sin4.sin_addr.s_addr = p4->addr;
5267                                 sa_touse = (struct sockaddr *)&sin4;
5268                                 break;
5269                         }
5270 #endif
5271 #ifdef INET6
5272                 case SCTP_IPV6_ADDRESS:
5273                         {
5274                                 struct sctp_ipv6addr_param *p6, p6_buf;
5275
5276                                 phdr = sctp_get_next_param(in_initpkt, offset,
5277                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5278                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5279                                     phdr == NULL) {
5280                                         return (1);
5281                                 }
5282                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5283                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5284                                     sizeof(p6->addr));
5285                                 sa_touse = (struct sockaddr *)&sin6;
5286                                 break;
5287                         }
5288 #endif
5289                 default:
5290                         sa_touse = NULL;
5291                         break;
5292                 }
5293                 if (sa_touse) {
5294                         /* ok, sa_touse points to one to check */
5295                         fnd = 0;
5296                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5297                                 sa = (struct sockaddr *)&net->ro._l_addr;
5298                                 if (sa->sa_family != sa_touse->sa_family) {
5299                                         continue;
5300                                 }
5301 #ifdef INET
5302                                 if (sa->sa_family == AF_INET) {
5303                                         sa4 = (struct sockaddr_in *)sa;
5304                                         if (sa4->sin_addr.s_addr ==
5305                                             sin4.sin_addr.s_addr) {
5306                                                 fnd = 1;
5307                                                 break;
5308                                         }
5309                                 }
5310 #endif
5311 #ifdef INET6
5312                                 if (sa->sa_family == AF_INET6) {
5313                                         sa6 = (struct sockaddr_in6 *)sa;
5314                                         if (SCTP6_ARE_ADDR_EQUAL(
5315                                             sa6, &sin6)) {
5316                                                 fnd = 1;
5317                                                 break;
5318                                         }
5319                                 }
5320 #endif
5321                         }
5322                         if (!fnd) {
5323                                 /* New addr added! no need to look further */
5324                                 return (1);
5325                         }
5326                 }
5327                 offset += SCTP_SIZE32(plen);
5328                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5329         }
5330         return (0);
5331 }
5332
5333 /*
5334  * Given a MBUF chain that was sent into us containing an INIT. Build a
5335  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5336  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5337  * message (i.e. the struct sctp_init_msg).
5338  */
5339 void
5340 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5341     struct mbuf *init_pkt, int iphlen, int offset,
5342     struct sockaddr *src, struct sockaddr *dst,
5343     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5344     uint8_t use_mflowid, uint32_t mflowid,
5345     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5346 {
5347         struct sctp_association *asoc;
5348         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5349         struct sctp_init_ack_chunk *initack;
5350         struct sctp_adaptation_layer_indication *ali;
5351         struct sctp_ecn_supported_param *ecn;
5352         struct sctp_prsctp_supported_param *prsctp;
5353         struct sctp_supported_chunk_types_param *pr_supported;
5354         union sctp_sockstore *over_addr;
5355
5356 #ifdef INET
5357         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5358         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5359         struct sockaddr_in *sin;
5360
5361 #endif
5362 #ifdef INET6
5363         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5364         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5365         struct sockaddr_in6 *sin6;
5366
5367 #endif
5368         struct sockaddr *to;
5369         struct sctp_state_cookie stc;
5370         struct sctp_nets *net = NULL;
5371         uint8_t *signature = NULL;
5372         int cnt_inits_to = 0;
5373         uint16_t his_limit, i_want;
5374         int abort_flag, padval;
5375         int num_ext;
5376         int p_len;
5377         int nat_friendly = 0;
5378         struct socket *so;
5379
5380         if (stcb) {
5381                 asoc = &stcb->asoc;
5382         } else {
5383                 asoc = NULL;
5384         }
5385         mp_last = NULL;
5386         if ((asoc != NULL) &&
5387             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5388             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5389                 /* new addresses, out of here in non-cookie-wait states */
5390                 /*
5391                  * Send a ABORT, we don't add the new address error clause
5392                  * though we even set the T bit and copy in the 0 tag.. this
5393                  * looks no different than if no listener was present.
5394                  */
5395                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5396                     "Address added");
5397                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5398                     use_mflowid, mflowid,
5399                     vrf_id, port);
5400                 return;
5401         }
5402         abort_flag = 0;
5403         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5404             (offset + sizeof(struct sctp_init_chunk)),
5405             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5406         if (abort_flag) {
5407 do_a_abort:
5408                 if (op_err == NULL) {
5409                         char msg[SCTP_DIAG_INFO_LEN];
5410
5411                         snprintf(msg, sizeof(msg), "%s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5412                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5413                             msg);
5414                 }
5415                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5416                     init_chk->init.initiate_tag, op_err,
5417                     use_mflowid, mflowid,
5418                     vrf_id, port);
5419                 return;
5420         }
5421         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5422         if (m == NULL) {
5423                 /* No memory, INIT timer will re-attempt. */
5424                 if (op_err)
5425                         sctp_m_freem(op_err);
5426                 return;
5427         }
5428         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5429
5430         /*
5431          * We might not overwrite the identification[] completely and on
5432          * some platforms time_entered will contain some padding. Therefore
5433          * zero out the cookie to avoid putting uninitialized memory on the
5434          * wire.
5435          */
5436         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5437
5438         /* the time I built cookie */
5439         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5440
5441         /* populate any tie tags */
5442         if (asoc != NULL) {
5443                 /* unlock before tag selections */
5444                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5445                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5446                 stc.cookie_life = asoc->cookie_life;
5447                 net = asoc->primary_destination;
5448         } else {
5449                 stc.tie_tag_my_vtag = 0;
5450                 stc.tie_tag_peer_vtag = 0;
5451                 /* life I will award this cookie */
5452                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5453         }
5454
5455         /* copy in the ports for later check */
5456         stc.myport = sh->dest_port;
5457         stc.peerport = sh->src_port;
5458
5459         /*
5460          * If we wanted to honor cookie life extentions, we would add to
5461          * stc.cookie_life. For now we should NOT honor any extension
5462          */
5463         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5464         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5465                 stc.ipv6_addr_legal = 1;
5466                 if (SCTP_IPV6_V6ONLY(inp)) {
5467                         stc.ipv4_addr_legal = 0;
5468                 } else {
5469                         stc.ipv4_addr_legal = 1;
5470                 }
5471         } else {
5472                 stc.ipv6_addr_legal = 0;
5473                 stc.ipv4_addr_legal = 1;
5474         }
5475 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5476         stc.ipv4_scope = 1;
5477 #else
5478         stc.ipv4_scope = 0;
5479 #endif
5480         if (net == NULL) {
5481                 to = src;
5482                 switch (dst->sa_family) {
5483 #ifdef INET
5484                 case AF_INET:
5485                         {
5486                                 /* lookup address */
5487                                 stc.address[0] = src4->sin_addr.s_addr;
5488                                 stc.address[1] = 0;
5489                                 stc.address[2] = 0;
5490                                 stc.address[3] = 0;
5491                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5492                                 /* local from address */
5493                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5494                                 stc.laddress[1] = 0;
5495                                 stc.laddress[2] = 0;
5496                                 stc.laddress[3] = 0;
5497                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5498                                 /* scope_id is only for v6 */
5499                                 stc.scope_id = 0;
5500 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5501                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5502                                         stc.ipv4_scope = 1;
5503                                 }
5504 #else
5505                                 stc.ipv4_scope = 1;
5506 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5507                                 /* Must use the address in this case */
5508                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5509                                         stc.loopback_scope = 1;
5510                                         stc.ipv4_scope = 1;
5511                                         stc.site_scope = 1;
5512                                         stc.local_scope = 0;
5513                                 }
5514                                 break;
5515                         }
5516 #endif
5517 #ifdef INET6
5518                 case AF_INET6:
5519                         {
5520                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5521                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5522                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5523                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5524                                         stc.loopback_scope = 1;
5525                                         stc.local_scope = 0;
5526                                         stc.site_scope = 1;
5527                                         stc.ipv4_scope = 1;
5528                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5529                                         /*
5530                                          * If the new destination is a
5531                                          * LINK_LOCAL we must have common
5532                                          * both site and local scope. Don't
5533                                          * set local scope though since we
5534                                          * must depend on the source to be
5535                                          * added implicitly. We cannot
5536                                          * assure just because we share one
5537                                          * link that all links are common.
5538                                          */
5539                                         stc.local_scope = 0;
5540                                         stc.site_scope = 1;
5541                                         stc.ipv4_scope = 1;
5542                                         /*
5543                                          * we start counting for the private
5544                                          * address stuff at 1. since the
5545                                          * link local we source from won't
5546                                          * show up in our scoped count.
5547                                          */
5548                                         cnt_inits_to = 1;
5549                                         /*
5550                                          * pull out the scope_id from
5551                                          * incoming pkt
5552                                          */
5553                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5554                                         /*
5555                                          * If the new destination is
5556                                          * SITE_LOCAL then we must have site
5557                                          * scope in common.
5558                                          */
5559                                         stc.site_scope = 1;
5560                                 }
5561                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5562                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5563                                 break;
5564                         }
5565 #endif
5566                 default:
5567                         /* TSNH */
5568                         goto do_a_abort;
5569                         break;
5570                 }
5571         } else {
5572                 /* set the scope per the existing tcb */
5573
5574 #ifdef INET6
5575                 struct sctp_nets *lnet;
5576
5577 #endif
5578
5579                 stc.loopback_scope = asoc->scope.loopback_scope;
5580                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5581                 stc.site_scope = asoc->scope.site_scope;
5582                 stc.local_scope = asoc->scope.local_scope;
5583 #ifdef INET6
5584                 /* Why do we not consider IPv4 LL addresses? */
5585                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5586                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5587                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5588                                         /*
5589                                          * if we have a LL address, start
5590                                          * counting at 1.
5591                                          */
5592                                         cnt_inits_to = 1;
5593                                 }
5594                         }
5595                 }
5596 #endif
5597                 /* use the net pointer */
5598                 to = (struct sockaddr *)&net->ro._l_addr;
5599                 switch (to->sa_family) {
5600 #ifdef INET
5601                 case AF_INET:
5602                         sin = (struct sockaddr_in *)to;
5603                         stc.address[0] = sin->sin_addr.s_addr;
5604                         stc.address[1] = 0;
5605                         stc.address[2] = 0;
5606                         stc.address[3] = 0;
5607                         stc.addr_type = SCTP_IPV4_ADDRESS;
5608                         if (net->src_addr_selected == 0) {
5609                                 /*
5610                                  * strange case here, the INIT should have
5611                                  * did the selection.
5612                                  */
5613                                 net->ro._s_addr = sctp_source_address_selection(inp,
5614                                     stcb, (sctp_route_t *) & net->ro,
5615                                     net, 0, vrf_id);
5616                                 if (net->ro._s_addr == NULL)
5617                                         return;
5618
5619                                 net->src_addr_selected = 1;
5620
5621                         }
5622                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5623                         stc.laddress[1] = 0;
5624                         stc.laddress[2] = 0;
5625                         stc.laddress[3] = 0;
5626                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5627                         /* scope_id is only for v6 */
5628                         stc.scope_id = 0;
5629                         break;
5630 #endif
5631 #ifdef INET6
5632                 case AF_INET6:
5633                         sin6 = (struct sockaddr_in6 *)to;
5634                         memcpy(&stc.address, &sin6->sin6_addr,
5635                             sizeof(struct in6_addr));
5636                         stc.addr_type = SCTP_IPV6_ADDRESS;
5637                         stc.scope_id = sin6->sin6_scope_id;
5638                         if (net->src_addr_selected == 0) {
5639                                 /*
5640                                  * strange case here, the INIT should have
5641                                  * done the selection.
5642                                  */
5643                                 net->ro._s_addr = sctp_source_address_selection(inp,
5644                                     stcb, (sctp_route_t *) & net->ro,
5645                                     net, 0, vrf_id);
5646                                 if (net->ro._s_addr == NULL)
5647                                         return;
5648
5649                                 net->src_addr_selected = 1;
5650                         }
5651                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5652                             sizeof(struct in6_addr));
5653                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5654                         break;
5655 #endif
5656                 }
5657         }
5658         /* Now lets put the SCTP header in place */
5659         initack = mtod(m, struct sctp_init_ack_chunk *);
5660         /* Save it off for quick ref */
5661         stc.peers_vtag = init_chk->init.initiate_tag;
5662         /* who are we */
5663         memcpy(stc.identification, SCTP_VERSION_STRING,
5664             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5665         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5666         /* now the chunk header */
5667         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5668         initack->ch.chunk_flags = 0;
5669         /* fill in later from mbuf we build */
5670         initack->ch.chunk_length = 0;
5671         /* place in my tag */
5672         if ((asoc != NULL) &&
5673             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5674             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5675             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5676                 /* re-use the v-tags and init-seq here */
5677                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5678                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5679         } else {
5680                 uint32_t vtag, itsn;
5681
5682                 if (hold_inp_lock) {
5683                         SCTP_INP_INCR_REF(inp);
5684                         SCTP_INP_RUNLOCK(inp);
5685                 }
5686                 if (asoc) {
5687                         atomic_add_int(&asoc->refcnt, 1);
5688                         SCTP_TCB_UNLOCK(stcb);
5689         new_tag:
5690                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5691                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5692                                 /*
5693                                  * Got a duplicate vtag on some guy behind a
5694                                  * nat make sure we don't use it.
5695                                  */
5696                                 goto new_tag;
5697                         }
5698                         initack->init.initiate_tag = htonl(vtag);
5699                         /* get a TSN to use too */
5700                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5701                         initack->init.initial_tsn = htonl(itsn);
5702                         SCTP_TCB_LOCK(stcb);
5703                         atomic_add_int(&asoc->refcnt, -1);
5704                 } else {
5705                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5706                         initack->init.initiate_tag = htonl(vtag);
5707                         /* get a TSN to use too */
5708                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5709                 }
5710                 if (hold_inp_lock) {
5711                         SCTP_INP_RLOCK(inp);
5712                         SCTP_INP_DECR_REF(inp);
5713                 }
5714         }
5715         /* save away my tag to */
5716         stc.my_vtag = initack->init.initiate_tag;
5717
5718         /* set up some of the credits. */
5719         so = inp->sctp_socket;
5720         if (so == NULL) {
5721                 /* memory problem */
5722                 sctp_m_freem(m);
5723                 return;
5724         } else {
5725                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5726         }
5727         /* set what I want */
5728         his_limit = ntohs(init_chk->init.num_inbound_streams);
5729         /* choose what I want */
5730         if (asoc != NULL) {
5731                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5732                         i_want = asoc->streamoutcnt;
5733                 } else {
5734                         i_want = inp->sctp_ep.pre_open_stream_count;
5735                 }
5736         } else {
5737                 i_want = inp->sctp_ep.pre_open_stream_count;
5738         }
5739         if (his_limit < i_want) {
5740                 /* I Want more :< */
5741                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5742         } else {
5743                 /* I can have what I want :> */
5744                 initack->init.num_outbound_streams = htons(i_want);
5745         }
5746         /* tell him his limit. */
5747         initack->init.num_inbound_streams =
5748             htons(inp->sctp_ep.max_open_streams_intome);
5749
5750         /* adaptation layer indication parameter */
5751         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5752                 ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5753                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5754                 ali->ph.param_length = htons(sizeof(*ali));
5755                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5756                 SCTP_BUF_LEN(m) += sizeof(*ali);
5757                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5758         } else {
5759                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)initack + sizeof(*initack));
5760         }
5761
5762         /* ECN parameter */
5763         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5764             (inp->sctp_ecn_enable == 1)) {
5765                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5766                 ecn->ph.param_length = htons(sizeof(*ecn));
5767                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5768
5769                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5770                     sizeof(*ecn));
5771         } else {
5772                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5773         }
5774         /* And now tell the peer we do  pr-sctp */
5775         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5776         prsctp->ph.param_length = htons(sizeof(*prsctp));
5777         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5778         if (nat_friendly) {
5779                 /* Add NAT friendly parameter */
5780                 struct sctp_paramhdr *ph;
5781
5782                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5783                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5784                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5785                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5786         }
5787         /* And now tell the peer we do all the extensions */
5788         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5789         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5790         num_ext = 0;
5791         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5792         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5793         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5794         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5795         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5796         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5797                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5798         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5799                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5800         p_len = sizeof(*pr_supported) + num_ext;
5801         pr_supported->ph.param_length = htons(p_len);
5802         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5803         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5804
5805         /* add authentication parameters */
5806         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5807                 struct sctp_auth_random *randp;
5808                 struct sctp_auth_hmac_algo *hmacs;
5809                 struct sctp_auth_chunk_list *chunks;
5810                 uint16_t random_len;
5811
5812                 /* generate and add RANDOM parameter */
5813                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5814                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5815                 randp->ph.param_type = htons(SCTP_RANDOM);
5816                 p_len = sizeof(*randp) + random_len;
5817                 randp->ph.param_length = htons(p_len);
5818                 SCTP_READ_RANDOM(randp->random_data, random_len);
5819                 /* zero out any padding required */
5820                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5821                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5822
5823                 /* add HMAC_ALGO parameter */
5824                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5825                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5826                     (uint8_t *) hmacs->hmac_ids);
5827                 if (p_len > 0) {
5828                         p_len += sizeof(*hmacs);
5829                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5830                         hmacs->ph.param_length = htons(p_len);
5831                         /* zero out any padding required */
5832                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5833                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5834                 }
5835                 /* add CHUNKS parameter */
5836                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5837                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5838                     chunks->chunk_types);
5839                 if (p_len > 0) {
5840                         p_len += sizeof(*chunks);
5841                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5842                         chunks->ph.param_length = htons(p_len);
5843                         /* zero out any padding required */
5844                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5845                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5846                 }
5847         }
5848         m_at = m;
5849         /* now the addresses */
5850         {
5851                 struct sctp_scoping scp;
5852
5853                 /*
5854                  * To optimize this we could put the scoping stuff into a
5855                  * structure and remove the individual uint8's from the stc
5856                  * structure. Then we could just sifa in the address within
5857                  * the stc.. but for now this is a quick hack to get the
5858                  * address stuff teased apart.
5859                  */
5860                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5861                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5862                 scp.loopback_scope = stc.loopback_scope;
5863                 scp.ipv4_local_scope = stc.ipv4_scope;
5864                 scp.local_scope = stc.local_scope;
5865                 scp.site_scope = stc.site_scope;
5866                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to, NULL, NULL);
5867         }
5868
5869         /* tack on the operational error if present */
5870         if (op_err) {
5871                 struct mbuf *ol;
5872                 int llen;
5873
5874                 llen = 0;
5875                 ol = op_err;
5876
5877                 while (ol) {
5878                         llen += SCTP_BUF_LEN(ol);
5879                         ol = SCTP_BUF_NEXT(ol);
5880                 }
5881                 if (llen % 4) {
5882                         /* must add a pad to the param */
5883                         uint32_t cpthis = 0;
5884                         int padlen;
5885
5886                         padlen = 4 - (llen % 4);
5887                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5888                 }
5889                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5890                         m_at = SCTP_BUF_NEXT(m_at);
5891                 }
5892                 SCTP_BUF_NEXT(m_at) = op_err;
5893                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5894                         m_at = SCTP_BUF_NEXT(m_at);
5895                 }
5896         }
5897         /* pre-calulate the size and update pkt header and chunk header */
5898         p_len = 0;
5899         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5900                 p_len += SCTP_BUF_LEN(m_tmp);
5901                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5902                         /* m_tmp should now point to last one */
5903                         break;
5904                 }
5905         }
5906
5907         /* Now we must build a cookie */
5908         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5909         if (m_cookie == NULL) {
5910                 /* memory problem */
5911                 sctp_m_freem(m);
5912                 return;
5913         }
5914         /* Now append the cookie to the end and update the space/size */
5915         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5916
5917         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5918                 p_len += SCTP_BUF_LEN(m_tmp);
5919                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5920                         /* m_tmp should now point to last one */
5921                         mp_last = m_tmp;
5922                         break;
5923                 }
5924         }
5925         /*
5926          * Place in the size, but we don't include the last pad (if any) in
5927          * the INIT-ACK.
5928          */
5929         initack->ch.chunk_length = htons(p_len);
5930
5931         /*
5932          * Time to sign the cookie, we don't sign over the cookie signature
5933          * though thus we set trailer.
5934          */
5935         (void)sctp_hmac_m(SCTP_HMAC,
5936             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5937             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5938             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5939         /*
5940          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5941          * here since the timer will drive a retranmission.
5942          */
5943         padval = p_len % 4;
5944         if ((padval) && (mp_last)) {
5945                 /* see my previous comments on mp_last */
5946                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5947                         /* Houston we have a problem, no space */
5948                         sctp_m_freem(m);
5949                         return;
5950                 }
5951         }
5952         if (stc.loopback_scope) {
5953                 over_addr = (union sctp_sockstore *)dst;
5954         } else {
5955                 over_addr = NULL;
5956         }
5957
5958         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5959             0, 0,
5960             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5961             port, over_addr,
5962             use_mflowid, mflowid,
5963             SCTP_SO_NOT_LOCKED);
5964         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5965 }
5966
5967
5968 static void
5969 sctp_prune_prsctp(struct sctp_tcb *stcb,
5970     struct sctp_association *asoc,
5971     struct sctp_sndrcvinfo *srcv,
5972     int dataout)
5973 {
5974         int freed_spc = 0;
5975         struct sctp_tmit_chunk *chk, *nchk;
5976
5977         SCTP_TCB_LOCK_ASSERT(stcb);
5978         if ((asoc->peer_supports_prsctp) &&
5979             (asoc->sent_queue_cnt_removeable > 0)) {
5980                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5981                         /*
5982                          * Look for chunks marked with the PR_SCTP flag AND
5983                          * the buffer space flag. If the one being sent is
5984                          * equal or greater priority then purge the old one
5985                          * and free some space.
5986                          */
5987                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5988                                 /*
5989                                  * This one is PR-SCTP AND buffer space
5990                                  * limited type
5991                                  */
5992                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5993                                         /*
5994                                          * Lower numbers equates to higher
5995                                          * priority so if the one we are
5996                                          * looking at has a larger or equal
5997                                          * priority we want to drop the data
5998                                          * and NOT retransmit it.
5999                                          */
6000                                         if (chk->data) {
6001                                                 /*
6002                                                  * We release the book_size
6003                                                  * if the mbuf is here
6004                                                  */
6005                                                 int ret_spc;
6006                                                 uint8_t sent;
6007
6008                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6009                                                         sent = 1;
6010                                                 else
6011                                                         sent = 0;
6012                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6013                                                     sent,
6014                                                     SCTP_SO_LOCKED);
6015                                                 freed_spc += ret_spc;
6016                                                 if (freed_spc >= dataout) {
6017                                                         return;
6018                                                 }
6019                                         }       /* if chunk was present */
6020                                 }       /* if of sufficent priority */
6021                         }       /* if chunk has enabled */
6022                 }               /* tailqforeach */
6023
6024                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6025                         /* Here we must move to the sent queue and mark */
6026                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6027                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6028                                         if (chk->data) {
6029                                                 /*
6030                                                  * We release the book_size
6031                                                  * if the mbuf is here
6032                                                  */
6033                                                 int ret_spc;
6034
6035                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6036                                                     0, SCTP_SO_LOCKED);
6037
6038                                                 freed_spc += ret_spc;
6039                                                 if (freed_spc >= dataout) {
6040                                                         return;
6041                                                 }
6042                                         }       /* end if chk->data */
6043                                 }       /* end if right class */
6044                         }       /* end if chk pr-sctp */
6045                 }               /* tailqforeachsafe (chk) */
6046         }                       /* if enabled in asoc */
6047 }
6048
6049 int
6050 sctp_get_frag_point(struct sctp_tcb *stcb,
6051     struct sctp_association *asoc)
6052 {
6053         int siz, ovh;
6054
6055         /*
6056          * For endpoints that have both v6 and v4 addresses we must reserve
6057          * room for the ipv6 header, for those that are only dealing with V4
6058          * we use a larger frag point.
6059          */
6060         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6061                 ovh = SCTP_MED_OVERHEAD;
6062         } else {
6063                 ovh = SCTP_MED_V4_OVERHEAD;
6064         }
6065
6066         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6067                 siz = asoc->smallest_mtu - ovh;
6068         else
6069                 siz = (stcb->asoc.sctp_frag_point - ovh);
6070         /*
6071          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6072          */
6073         /* A data chunk MUST fit in a cluster */
6074         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6075         /* } */
6076
6077         /* adjust for an AUTH chunk if DATA requires auth */
6078         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6079                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6080
6081         if (siz % 4) {
6082                 /* make it an even word boundary please */
6083                 siz -= (siz % 4);
6084         }
6085         return (siz);
6086 }
6087
6088 static void
6089 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6090 {
6091         /*
6092          * We assume that the user wants PR_SCTP_TTL if the user provides a
6093          * positive lifetime but does not specify any PR_SCTP policy.
6094          */
6095         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6096                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6097         } else if (sp->timetolive > 0) {
6098                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6099                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6100         } else {
6101                 return;
6102         }
6103         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6104         case CHUNK_FLAGS_PR_SCTP_BUF:
6105                 /*
6106                  * Time to live is a priority stored in tv_sec when doing
6107                  * the buffer drop thing.
6108                  */
6109                 sp->ts.tv_sec = sp->timetolive;
6110                 sp->ts.tv_usec = 0;
6111                 break;
6112         case CHUNK_FLAGS_PR_SCTP_TTL:
6113                 {
6114                         struct timeval tv;
6115
6116                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6117                         tv.tv_sec = sp->timetolive / 1000;
6118                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6119                         /*
6120                          * TODO sctp_constants.h needs alternative time
6121                          * macros when _KERNEL is undefined.
6122                          */
6123                         timevaladd(&sp->ts, &tv);
6124                 }
6125                 break;
6126         case CHUNK_FLAGS_PR_SCTP_RTX:
6127                 /*
6128                  * Time to live is a the number or retransmissions stored in
6129                  * tv_sec.
6130                  */
6131                 sp->ts.tv_sec = sp->timetolive;
6132                 sp->ts.tv_usec = 0;
6133                 break;
6134         default:
6135                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6136                     "Unknown PR_SCTP policy %u.\n",
6137                     PR_SCTP_POLICY(sp->sinfo_flags));
6138                 break;
6139         }
6140 }
6141
6142 static int
6143 sctp_msg_append(struct sctp_tcb *stcb,
6144     struct sctp_nets *net,
6145     struct mbuf *m,
6146     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6147 {
6148         int error = 0;
6149         struct mbuf *at;
6150         struct sctp_stream_queue_pending *sp = NULL;
6151         struct sctp_stream_out *strm;
6152
6153         /*
6154          * Given an mbuf chain, put it into the association send queue and
6155          * place it on the wheel
6156          */
6157         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6158                 /* Invalid stream number */
6159                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6160                 error = EINVAL;
6161                 goto out_now;
6162         }
6163         if ((stcb->asoc.stream_locked) &&
6164             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6165                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6166                 error = EINVAL;
6167                 goto out_now;
6168         }
6169         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6170         /* Now can we send this? */
6171         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6172             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6173             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6174             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6175                 /* got data while shutting down */
6176                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6177                 error = ECONNRESET;
6178                 goto out_now;
6179         }
6180         sctp_alloc_a_strmoq(stcb, sp);
6181         if (sp == NULL) {
6182                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6183                 error = ENOMEM;
6184                 goto out_now;
6185         }
6186         sp->sinfo_flags = srcv->sinfo_flags;
6187         sp->timetolive = srcv->sinfo_timetolive;
6188         sp->ppid = srcv->sinfo_ppid;
6189         sp->context = srcv->sinfo_context;
6190         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6191                 sp->net = net;
6192                 atomic_add_int(&sp->net->ref_count, 1);
6193         } else {
6194                 sp->net = NULL;
6195         }
6196         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6197         sp->stream = srcv->sinfo_stream;
6198         sp->msg_is_complete = 1;
6199         sp->sender_all_done = 1;
6200         sp->some_taken = 0;
6201         sp->data = m;
6202         sp->tail_mbuf = NULL;
6203         sctp_set_prsctp_policy(sp);
6204         /*
6205          * We could in theory (for sendall) sifa the length in, but we would
6206          * still have to hunt through the chain since we need to setup the
6207          * tail_mbuf
6208          */
6209         sp->length = 0;
6210         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6211                 if (SCTP_BUF_NEXT(at) == NULL)
6212                         sp->tail_mbuf = at;
6213                 sp->length += SCTP_BUF_LEN(at);
6214         }
6215         if (srcv->sinfo_keynumber_valid) {
6216                 sp->auth_keyid = srcv->sinfo_keynumber;
6217         } else {
6218                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6219         }
6220         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6221                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6222                 sp->holds_key_ref = 1;
6223         }
6224         if (hold_stcb_lock == 0) {
6225                 SCTP_TCB_SEND_LOCK(stcb);
6226         }
6227         sctp_snd_sb_alloc(stcb, sp->length);
6228         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6229         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6230         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6231         m = NULL;
6232         if (hold_stcb_lock == 0) {
6233                 SCTP_TCB_SEND_UNLOCK(stcb);
6234         }
6235 out_now:
6236         if (m) {
6237                 sctp_m_freem(m);
6238         }
6239         return (error);
6240 }
6241
6242
6243 static struct mbuf *
6244 sctp_copy_mbufchain(struct mbuf *clonechain,
6245     struct mbuf *outchain,
6246     struct mbuf **endofchain,
6247     int can_take_mbuf,
6248     int sizeofcpy,
6249     uint8_t copy_by_ref)
6250 {
6251         struct mbuf *m;
6252         struct mbuf *appendchain;
6253         caddr_t cp;
6254         int len;
6255
6256         if (endofchain == NULL) {
6257                 /* error */
6258 error_out:
6259                 if (outchain)
6260                         sctp_m_freem(outchain);
6261                 return (NULL);
6262         }
6263         if (can_take_mbuf) {
6264                 appendchain = clonechain;
6265         } else {
6266                 if (!copy_by_ref &&
6267                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6268                     ) {
6269                         /* Its not in a cluster */
6270                         if (*endofchain == NULL) {
6271                                 /* lets get a mbuf cluster */
6272                                 if (outchain == NULL) {
6273                                         /* This is the general case */
6274                         new_mbuf:
6275                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6276                                         if (outchain == NULL) {
6277                                                 goto error_out;
6278                                         }
6279                                         SCTP_BUF_LEN(outchain) = 0;
6280                                         *endofchain = outchain;
6281                                         /* get the prepend space */
6282                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6283                                 } else {
6284                                         /*
6285                                          * We really should not get a NULL
6286                                          * in endofchain
6287                                          */
6288                                         /* find end */
6289                                         m = outchain;
6290                                         while (m) {
6291                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6292                                                         *endofchain = m;
6293                                                         break;
6294                                                 }
6295                                                 m = SCTP_BUF_NEXT(m);
6296                                         }
6297                                         /* sanity */
6298                                         if (*endofchain == NULL) {
6299                                                 /*
6300                                                  * huh, TSNH XXX maybe we
6301                                                  * should panic
6302                                                  */
6303                                                 sctp_m_freem(outchain);
6304                                                 goto new_mbuf;
6305                                         }
6306                                 }
6307                                 /* get the new end of length */
6308                                 len = M_TRAILINGSPACE(*endofchain);
6309                         } else {
6310                                 /* how much is left at the end? */
6311                                 len = M_TRAILINGSPACE(*endofchain);
6312                         }
6313                         /* Find the end of the data, for appending */
6314                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6315
6316                         /* Now lets copy it out */
6317                         if (len >= sizeofcpy) {
6318                                 /* It all fits, copy it in */
6319                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6320                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6321                         } else {
6322                                 /* fill up the end of the chain */
6323                                 if (len > 0) {
6324                                         m_copydata(clonechain, 0, len, cp);
6325                                         SCTP_BUF_LEN((*endofchain)) += len;
6326                                         /* now we need another one */
6327                                         sizeofcpy -= len;
6328                                 }
6329                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6330                                 if (m == NULL) {
6331                                         /* We failed */
6332                                         goto error_out;
6333                                 }
6334                                 SCTP_BUF_NEXT((*endofchain)) = m;
6335                                 *endofchain = m;
6336                                 cp = mtod((*endofchain), caddr_t);
6337                                 m_copydata(clonechain, len, sizeofcpy, cp);
6338                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6339                         }
6340                         return (outchain);
6341                 } else {
6342                         /* copy the old fashion way */
6343                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6344 #ifdef SCTP_MBUF_LOGGING
6345                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6346                                 struct mbuf *mat;
6347
6348                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6349                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6350                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6351                                         }
6352                                 }
6353                         }
6354 #endif
6355                 }
6356         }
6357         if (appendchain == NULL) {
6358                 /* error */
6359                 if (outchain)
6360                         sctp_m_freem(outchain);
6361                 return (NULL);
6362         }
6363         if (outchain) {
6364                 /* tack on to the end */
6365                 if (*endofchain != NULL) {
6366                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6367                 } else {
6368                         m = outchain;
6369                         while (m) {
6370                                 if (SCTP_BUF_NEXT(m) == NULL) {
6371                                         SCTP_BUF_NEXT(m) = appendchain;
6372                                         break;
6373                                 }
6374                                 m = SCTP_BUF_NEXT(m);
6375                         }
6376                 }
6377                 /*
6378                  * save off the end and update the end-chain postion
6379                  */
6380                 m = appendchain;
6381                 while (m) {
6382                         if (SCTP_BUF_NEXT(m) == NULL) {
6383                                 *endofchain = m;
6384                                 break;
6385                         }
6386                         m = SCTP_BUF_NEXT(m);
6387                 }
6388                 return (outchain);
6389         } else {
6390                 /* save off the end and update the end-chain postion */
6391                 m = appendchain;
6392                 while (m) {
6393                         if (SCTP_BUF_NEXT(m) == NULL) {
6394                                 *endofchain = m;
6395                                 break;
6396                         }
6397                         m = SCTP_BUF_NEXT(m);
6398                 }
6399                 return (appendchain);
6400         }
6401 }
6402
6403 static int
6404 sctp_med_chunk_output(struct sctp_inpcb *inp,
6405     struct sctp_tcb *stcb,
6406     struct sctp_association *asoc,
6407     int *num_out,
6408     int *reason_code,
6409     int control_only, int from_where,
6410     struct timeval *now, int *now_filled, int frag_point, int so_locked
6411 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6412     SCTP_UNUSED
6413 #endif
6414 );
6415
6416 static void
6417 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6418     uint32_t val SCTP_UNUSED)
6419 {
6420         struct sctp_copy_all *ca;
6421         struct mbuf *m;
6422         int ret = 0;
6423         int added_control = 0;
6424         int un_sent, do_chunk_output = 1;
6425         struct sctp_association *asoc;
6426         struct sctp_nets *net;
6427
6428         ca = (struct sctp_copy_all *)ptr;
6429         if (ca->m == NULL) {
6430                 return;
6431         }
6432         if (ca->inp != inp) {
6433                 /* TSNH */
6434                 return;
6435         }
6436         if (ca->sndlen > 0) {
6437                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6438                 if (m == NULL) {
6439                         /* can't copy so we are done */
6440                         ca->cnt_failed++;
6441                         return;
6442                 }
6443 #ifdef SCTP_MBUF_LOGGING
6444                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6445                         struct mbuf *mat;
6446
6447                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6448                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6449                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6450                                 }
6451                         }
6452                 }
6453 #endif
6454         } else {
6455                 m = NULL;
6456         }
6457         SCTP_TCB_LOCK_ASSERT(stcb);
6458         if (stcb->asoc.alternate) {
6459                 net = stcb->asoc.alternate;
6460         } else {
6461                 net = stcb->asoc.primary_destination;
6462         }
6463         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6464                 /* Abort this assoc with m as the user defined reason */
6465                 if (m != NULL) {
6466                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6467                 } else {
6468                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6469                             0, M_NOWAIT, 1, MT_DATA);
6470                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6471                 }
6472                 if (m != NULL) {
6473                         struct sctp_paramhdr *ph;
6474
6475                         ph = mtod(m, struct sctp_paramhdr *);
6476                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6477                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6478                 }
6479                 /*
6480                  * We add one here to keep the assoc from dis-appearing on
6481                  * us.
6482                  */
6483                 atomic_add_int(&stcb->asoc.refcnt, 1);
6484                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6485                 /*
6486                  * sctp_abort_an_association calls sctp_free_asoc() free
6487                  * association will NOT free it since we incremented the
6488                  * refcnt .. we do this to prevent it being freed and things
6489                  * getting tricky since we could end up (from free_asoc)
6490                  * calling inpcb_free which would get a recursive lock call
6491                  * to the iterator lock.. But as a consequence of that the
6492                  * stcb will return to us un-locked.. since free_asoc
6493                  * returns with either no TCB or the TCB unlocked, we must
6494                  * relock.. to unlock in the iterator timer :-0
6495                  */
6496                 SCTP_TCB_LOCK(stcb);
6497                 atomic_add_int(&stcb->asoc.refcnt, -1);
6498                 goto no_chunk_output;
6499         } else {
6500                 if (m) {
6501                         ret = sctp_msg_append(stcb, net, m,
6502                             &ca->sndrcv, 1);
6503                 }
6504                 asoc = &stcb->asoc;
6505                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6506                         /* shutdown this assoc */
6507                         int cnt;
6508
6509                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6510
6511                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6512                             TAILQ_EMPTY(&asoc->sent_queue) &&
6513                             (cnt == 0)) {
6514                                 if (asoc->locked_on_sending) {
6515                                         goto abort_anyway;
6516                                 }
6517                                 /*
6518                                  * there is nothing queued to send, so I'm
6519                                  * done...
6520                                  */
6521                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6522                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6523                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6524                                         /*
6525                                          * only send SHUTDOWN the first time
6526                                          * through
6527                                          */
6528                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6529                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6530                                         }
6531                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6532                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6533                                         sctp_stop_timers_for_shutdown(stcb);
6534                                         sctp_send_shutdown(stcb, net);
6535                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6536                                             net);
6537                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6538                                             asoc->primary_destination);
6539                                         added_control = 1;
6540                                         do_chunk_output = 0;
6541                                 }
6542                         } else {
6543                                 /*
6544                                  * we still got (or just got) data to send,
6545                                  * so set SHUTDOWN_PENDING
6546                                  */
6547                                 /*
6548                                  * XXX sockets draft says that SCTP_EOF
6549                                  * should be sent with no data.  currently,
6550                                  * we will allow user data to be sent first
6551                                  * and move to SHUTDOWN-PENDING
6552                                  */
6553                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6554                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6555                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6556                                         if (asoc->locked_on_sending) {
6557                                                 /*
6558                                                  * Locked to send out the
6559                                                  * data
6560                                                  */
6561                                                 struct sctp_stream_queue_pending *sp;
6562
6563                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6564                                                 if (sp) {
6565                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6566                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6567                                                 }
6568                                         }
6569                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6570                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6571                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6572                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6573                                 abort_anyway:
6574                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6575                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6576                                                     NULL, SCTP_SO_NOT_LOCKED);
6577                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6578                                                 goto no_chunk_output;
6579                                         }
6580                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6581                                             asoc->primary_destination);
6582                                 }
6583                         }
6584
6585                 }
6586         }
6587         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6588             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6589
6590         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6591             (stcb->asoc.total_flight > 0) &&
6592             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6593                 do_chunk_output = 0;
6594         }
6595         if (do_chunk_output)
6596                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6597         else if (added_control) {
6598                 int num_out = 0, reason = 0, now_filled = 0;
6599                 struct timeval now;
6600                 int frag_point;
6601
6602                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6603                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6604                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6605         }
6606 no_chunk_output:
6607         if (ret) {
6608                 ca->cnt_failed++;
6609         } else {
6610                 ca->cnt_sent++;
6611         }
6612 }
6613
6614 static void
6615 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6616 {
6617         struct sctp_copy_all *ca;
6618
6619         ca = (struct sctp_copy_all *)ptr;
6620         /*
6621          * Do a notify here? Kacheong suggests that the notify be done at
6622          * the send time.. so you would push up a notification if any send
6623          * failed. Don't know if this is feasable since the only failures we
6624          * have is "memory" related and if you cannot get an mbuf to send
6625          * the data you surely can't get an mbuf to send up to notify the
6626          * user you can't send the data :->
6627          */
6628
6629         /* now free everything */
6630         sctp_m_freem(ca->m);
6631         SCTP_FREE(ca, SCTP_M_COPYAL);
6632 }
6633
6634
6635 #define MC_ALIGN(m, len) do {                                           \
6636         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6637 } while (0)
6638
6639
6640
6641 static struct mbuf *
6642 sctp_copy_out_all(struct uio *uio, int len)
6643 {
6644         struct mbuf *ret, *at;
6645         int left, willcpy, cancpy, error;
6646
6647         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6648         if (ret == NULL) {
6649                 /* TSNH */
6650                 return (NULL);
6651         }
6652         left = len;
6653         SCTP_BUF_LEN(ret) = 0;
6654         /* save space for the data chunk header */
6655         cancpy = M_TRAILINGSPACE(ret);
6656         willcpy = min(cancpy, left);
6657         at = ret;
6658         while (left > 0) {
6659                 /* Align data to the end */
6660                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6661                 if (error) {
6662         err_out_now:
6663                         sctp_m_freem(at);
6664                         return (NULL);
6665                 }
6666                 SCTP_BUF_LEN(at) = willcpy;
6667                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6668                 left -= willcpy;
6669                 if (left > 0) {
6670                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6671                         if (SCTP_BUF_NEXT(at) == NULL) {
6672                                 goto err_out_now;
6673                         }
6674                         at = SCTP_BUF_NEXT(at);
6675                         SCTP_BUF_LEN(at) = 0;
6676                         cancpy = M_TRAILINGSPACE(at);
6677                         willcpy = min(cancpy, left);
6678                 }
6679         }
6680         return (ret);
6681 }
6682
6683 static int
6684 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6685     struct sctp_sndrcvinfo *srcv)
6686 {
6687         int ret;
6688         struct sctp_copy_all *ca;
6689
6690         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6691             SCTP_M_COPYAL);
6692         if (ca == NULL) {
6693                 sctp_m_freem(m);
6694                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6695                 return (ENOMEM);
6696         }
6697         memset(ca, 0, sizeof(struct sctp_copy_all));
6698
6699         ca->inp = inp;
6700         if (srcv) {
6701                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6702         }
6703         /*
6704          * take off the sendall flag, it would be bad if we failed to do
6705          * this :-0
6706          */
6707         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6708         /* get length and mbuf chain */
6709         if (uio) {
6710                 ca->sndlen = uio->uio_resid;
6711                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6712                 if (ca->m == NULL) {
6713                         SCTP_FREE(ca, SCTP_M_COPYAL);
6714                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6715                         return (ENOMEM);
6716                 }
6717         } else {
6718                 /* Gather the length of the send */
6719                 struct mbuf *mat;
6720
6721                 ca->sndlen = 0;
6722                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6723                         ca->sndlen += SCTP_BUF_LEN(mat);
6724                 }
6725         }
6726         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6727             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6728             SCTP_ASOC_ANY_STATE,
6729             (void *)ca, 0,
6730             sctp_sendall_completes, inp, 1);
6731         if (ret) {
6732                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6733                 SCTP_FREE(ca, SCTP_M_COPYAL);
6734                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6735                 return (EFAULT);
6736         }
6737         return (0);
6738 }
6739
6740
6741 void
6742 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6743 {
6744         struct sctp_tmit_chunk *chk, *nchk;
6745
6746         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6747                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6748                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6749                         if (chk->data) {
6750                                 sctp_m_freem(chk->data);
6751                                 chk->data = NULL;
6752                         }
6753                         asoc->ctrl_queue_cnt--;
6754                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6755                 }
6756         }
6757 }
6758
6759 void
6760 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6761 {
6762         struct sctp_association *asoc;
6763         struct sctp_tmit_chunk *chk, *nchk;
6764         struct sctp_asconf_chunk *acp;
6765
6766         asoc = &stcb->asoc;
6767         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6768                 /* find SCTP_ASCONF chunk in queue */
6769                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6770                         if (chk->data) {
6771                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6772                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6773                                         /* Not Acked yet */
6774                                         break;
6775                                 }
6776                         }
6777                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6778                         if (chk->data) {
6779                                 sctp_m_freem(chk->data);
6780                                 chk->data = NULL;
6781                         }
6782                         asoc->ctrl_queue_cnt--;
6783                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6784                 }
6785         }
6786 }
6787
6788
6789 static void
6790 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6791     struct sctp_association *asoc,
6792     struct sctp_tmit_chunk **data_list,
6793     int bundle_at,
6794     struct sctp_nets *net)
6795 {
6796         int i;
6797         struct sctp_tmit_chunk *tp1;
6798
6799         for (i = 0; i < bundle_at; i++) {
6800                 /* off of the send queue */
6801                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6802                 asoc->send_queue_cnt--;
6803                 if (i > 0) {
6804                         /*
6805                          * Any chunk NOT 0 you zap the time chunk 0 gets
6806                          * zapped or set based on if a RTO measurment is
6807                          * needed.
6808                          */
6809                         data_list[i]->do_rtt = 0;
6810                 }
6811                 /* record time */
6812                 data_list[i]->sent_rcv_time = net->last_sent_time;
6813                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6814                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6815                 if (data_list[i]->whoTo == NULL) {
6816                         data_list[i]->whoTo = net;
6817                         atomic_add_int(&net->ref_count, 1);
6818                 }
6819                 /* on to the sent queue */
6820                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6821                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6822                         struct sctp_tmit_chunk *tpp;
6823
6824                         /* need to move back */
6825         back_up_more:
6826                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6827                         if (tpp == NULL) {
6828                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6829                                 goto all_done;
6830                         }
6831                         tp1 = tpp;
6832                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6833                                 goto back_up_more;
6834                         }
6835                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6836                 } else {
6837                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6838                             data_list[i],
6839                             sctp_next);
6840                 }
6841 all_done:
6842                 /* This does not lower until the cum-ack passes it */
6843                 asoc->sent_queue_cnt++;
6844                 if ((asoc->peers_rwnd <= 0) &&
6845                     (asoc->total_flight == 0) &&
6846                     (bundle_at == 1)) {
6847                         /* Mark the chunk as being a window probe */
6848                         SCTP_STAT_INCR(sctps_windowprobed);
6849                 }
6850 #ifdef SCTP_AUDITING_ENABLED
6851                 sctp_audit_log(0xC2, 3);
6852 #endif
6853                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6854                 data_list[i]->snd_count = 1;
6855                 data_list[i]->rec.data.chunk_was_revoked = 0;
6856                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6857                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6858                             data_list[i]->whoTo->flight_size,
6859                             data_list[i]->book_size,
6860                             (uintptr_t) data_list[i]->whoTo,
6861                             data_list[i]->rec.data.TSN_seq);
6862                 }
6863                 sctp_flight_size_increase(data_list[i]);
6864                 sctp_total_flight_increase(stcb, data_list[i]);
6865                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6866                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6867                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6868                 }
6869                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6870                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6871                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6872                         /* SWS sender side engages */
6873                         asoc->peers_rwnd = 0;
6874                 }
6875         }
6876         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6877                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6878         }
6879 }
6880
6881 static void
6882 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6883 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6884     SCTP_UNUSED
6885 #endif
6886 )
6887 {
6888         struct sctp_tmit_chunk *chk, *nchk;
6889
6890         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6891                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6892                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6893                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6894                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6895                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6896                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6897                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6898                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6899                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6900                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6901                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6902                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6903                         /* Stray chunks must be cleaned up */
6904         clean_up_anyway:
6905                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6906                         if (chk->data) {
6907                                 sctp_m_freem(chk->data);
6908                                 chk->data = NULL;
6909                         }
6910                         asoc->ctrl_queue_cnt--;
6911                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6912                                 asoc->fwd_tsn_cnt--;
6913                         sctp_free_a_chunk(stcb, chk, so_locked);
6914                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6915                         /* special handling, we must look into the param */
6916                         if (chk != asoc->str_reset) {
6917                                 goto clean_up_anyway;
6918                         }
6919                 }
6920         }
6921 }
6922
6923
6924 static int
6925 sctp_can_we_split_this(struct sctp_tcb *stcb,
6926     uint32_t length,
6927     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6928 {
6929         /*
6930          * Make a decision on if I should split a msg into multiple parts.
6931          * This is only asked of incomplete messages.
6932          */
6933         if (eeor_on) {
6934                 /*
6935                  * If we are doing EEOR we need to always send it if its the
6936                  * entire thing, since it might be all the guy is putting in
6937                  * the hopper.
6938                  */
6939                 if (goal_mtu >= length) {
6940                         /*-
6941                          * If we have data outstanding,
6942                          * we get another chance when the sack
6943                          * arrives to transmit - wait for more data
6944                          */
6945                         if (stcb->asoc.total_flight == 0) {
6946                                 /*
6947                                  * If nothing is in flight, we zero the
6948                                  * packet counter.
6949                                  */
6950                                 return (length);
6951                         }
6952                         return (0);
6953
6954                 } else {
6955                         /* You can fill the rest */
6956                         return (goal_mtu);
6957                 }
6958         }
6959         /*-
6960          * For those strange folk that make the send buffer
6961          * smaller than our fragmentation point, we can't
6962          * get a full msg in so we have to allow splitting.
6963          */
6964         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6965                 return (length);
6966         }
6967         if ((length <= goal_mtu) ||
6968             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6969                 /* Sub-optimial residual don't split in non-eeor mode. */
6970                 return (0);
6971         }
6972         /*
6973          * If we reach here length is larger than the goal_mtu. Do we wish
6974          * to split it for the sake of packet putting together?
6975          */
6976         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6977                 /* Its ok to split it */
6978                 return (min(goal_mtu, frag_point));
6979         }
6980         /* Nope, can't split */
6981         return (0);
6982
6983 }
6984
6985 static uint32_t
6986 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6987     struct sctp_stream_out *strq,
6988     uint32_t goal_mtu,
6989     uint32_t frag_point,
6990     int *locked,
6991     int *giveup,
6992     int eeor_mode,
6993     int *bail,
6994     int so_locked
6995 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6996     SCTP_UNUSED
6997 #endif
6998 )
6999 {
7000         /* Move from the stream to the send_queue keeping track of the total */
7001         struct sctp_association *asoc;
7002         struct sctp_stream_queue_pending *sp;
7003         struct sctp_tmit_chunk *chk;
7004         struct sctp_data_chunk *dchkh;
7005         uint32_t to_move, length;
7006         uint8_t rcv_flags = 0;
7007         uint8_t some_taken;
7008         uint8_t send_lock_up = 0;
7009
7010         SCTP_TCB_LOCK_ASSERT(stcb);
7011         asoc = &stcb->asoc;
7012 one_more_time:
7013         /* sa_ignore FREED_MEMORY */
7014         sp = TAILQ_FIRST(&strq->outqueue);
7015         if (sp == NULL) {
7016                 *locked = 0;
7017                 if (send_lock_up == 0) {
7018                         SCTP_TCB_SEND_LOCK(stcb);
7019                         send_lock_up = 1;
7020                 }
7021                 sp = TAILQ_FIRST(&strq->outqueue);
7022                 if (sp) {
7023                         goto one_more_time;
7024                 }
7025                 if (strq->last_msg_incomplete) {
7026                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7027                             strq->stream_no,
7028                             strq->last_msg_incomplete);
7029                         strq->last_msg_incomplete = 0;
7030                 }
7031                 to_move = 0;
7032                 if (send_lock_up) {
7033                         SCTP_TCB_SEND_UNLOCK(stcb);
7034                         send_lock_up = 0;
7035                 }
7036                 goto out_of;
7037         }
7038         if ((sp->msg_is_complete) && (sp->length == 0)) {
7039                 if (sp->sender_all_done) {
7040                         /*
7041                          * We are doing differed cleanup. Last time through
7042                          * when we took all the data the sender_all_done was
7043                          * not set.
7044                          */
7045                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7046                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7047                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7048                                     sp->sender_all_done,
7049                                     sp->length,
7050                                     sp->msg_is_complete,
7051                                     sp->put_last_out,
7052                                     send_lock_up);
7053                         }
7054                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7055                                 SCTP_TCB_SEND_LOCK(stcb);
7056                                 send_lock_up = 1;
7057                         }
7058                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7059                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7060                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7061                         if (sp->net) {
7062                                 sctp_free_remote_addr(sp->net);
7063                                 sp->net = NULL;
7064                         }
7065                         if (sp->data) {
7066                                 sctp_m_freem(sp->data);
7067                                 sp->data = NULL;
7068                         }
7069                         sctp_free_a_strmoq(stcb, sp, so_locked);
7070                         /* we can't be locked to it */
7071                         *locked = 0;
7072                         stcb->asoc.locked_on_sending = NULL;
7073                         if (send_lock_up) {
7074                                 SCTP_TCB_SEND_UNLOCK(stcb);
7075                                 send_lock_up = 0;
7076                         }
7077                         /* back to get the next msg */
7078                         goto one_more_time;
7079                 } else {
7080                         /*
7081                          * sender just finished this but still holds a
7082                          * reference
7083                          */
7084                         *locked = 1;
7085                         *giveup = 1;
7086                         to_move = 0;
7087                         goto out_of;
7088                 }
7089         } else {
7090                 /* is there some to get */
7091                 if (sp->length == 0) {
7092                         /* no */
7093                         *locked = 1;
7094                         *giveup = 1;
7095                         to_move = 0;
7096                         goto out_of;
7097                 } else if (sp->discard_rest) {
7098                         if (send_lock_up == 0) {
7099                                 SCTP_TCB_SEND_LOCK(stcb);
7100                                 send_lock_up = 1;
7101                         }
7102                         /* Whack down the size */
7103                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7104                         if ((stcb->sctp_socket != NULL) && \
7105                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7106                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7107                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7108                         }
7109                         if (sp->data) {
7110                                 sctp_m_freem(sp->data);
7111                                 sp->data = NULL;
7112                                 sp->tail_mbuf = NULL;
7113                         }
7114                         sp->length = 0;
7115                         sp->some_taken = 1;
7116                         *locked = 1;
7117                         *giveup = 1;
7118                         to_move = 0;
7119                         goto out_of;
7120                 }
7121         }
7122         some_taken = sp->some_taken;
7123         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7124                 sp->msg_is_complete = 1;
7125         }
7126 re_look:
7127         length = sp->length;
7128         if (sp->msg_is_complete) {
7129                 /* The message is complete */
7130                 to_move = min(length, frag_point);
7131                 if (to_move == length) {
7132                         /* All of it fits in the MTU */
7133                         if (sp->some_taken) {
7134                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7135                                 sp->put_last_out = 1;
7136                         } else {
7137                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7138                                 sp->put_last_out = 1;
7139                         }
7140                 } else {
7141                         /* Not all of it fits, we fragment */
7142                         if (sp->some_taken == 0) {
7143                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7144                         }
7145                         sp->some_taken = 1;
7146                 }
7147         } else {
7148                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7149                 if (to_move) {
7150                         /*-
7151                          * We use a snapshot of length in case it
7152                          * is expanding during the compare.
7153                          */
7154                         uint32_t llen;
7155
7156                         llen = length;
7157                         if (to_move >= llen) {
7158                                 to_move = llen;
7159                                 if (send_lock_up == 0) {
7160                                         /*-
7161                                          * We are taking all of an incomplete msg
7162                                          * thus we need a send lock.
7163                                          */
7164                                         SCTP_TCB_SEND_LOCK(stcb);
7165                                         send_lock_up = 1;
7166                                         if (sp->msg_is_complete) {
7167                                                 /*
7168                                                  * the sender finished the
7169                                                  * msg
7170                                                  */
7171                                                 goto re_look;
7172                                         }
7173                                 }
7174                         }
7175                         if (sp->some_taken == 0) {
7176                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7177                                 sp->some_taken = 1;
7178                         }
7179                 } else {
7180                         /* Nothing to take. */
7181                         if (sp->some_taken) {
7182                                 *locked = 1;
7183                         }
7184                         *giveup = 1;
7185                         to_move = 0;
7186                         goto out_of;
7187                 }
7188         }
7189
7190         /* If we reach here, we can copy out a chunk */
7191         sctp_alloc_a_chunk(stcb, chk);
7192         if (chk == NULL) {
7193                 /* No chunk memory */
7194                 *giveup = 1;
7195                 to_move = 0;
7196                 goto out_of;
7197         }
7198         /*
7199          * Setup for unordered if needed by looking at the user sent info
7200          * flags.
7201          */
7202         if (sp->sinfo_flags & SCTP_UNORDERED) {
7203                 rcv_flags |= SCTP_DATA_UNORDERED;
7204         }
7205         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7206             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7207                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7208         }
7209         /* clear out the chunk before setting up */
7210         memset(chk, 0, sizeof(*chk));
7211         chk->rec.data.rcv_flags = rcv_flags;
7212
7213         if (to_move >= length) {
7214                 /* we think we can steal the whole thing */
7215                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7216                         SCTP_TCB_SEND_LOCK(stcb);
7217                         send_lock_up = 1;
7218                 }
7219                 if (to_move < sp->length) {
7220                         /* bail, it changed */
7221                         goto dont_do_it;
7222                 }
7223                 chk->data = sp->data;
7224                 chk->last_mbuf = sp->tail_mbuf;
7225                 /* register the stealing */
7226                 sp->data = sp->tail_mbuf = NULL;
7227         } else {
7228                 struct mbuf *m;
7229
7230 dont_do_it:
7231                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7232                 chk->last_mbuf = NULL;
7233                 if (chk->data == NULL) {
7234                         sp->some_taken = some_taken;
7235                         sctp_free_a_chunk(stcb, chk, so_locked);
7236                         *bail = 1;
7237                         to_move = 0;
7238                         goto out_of;
7239                 }
7240 #ifdef SCTP_MBUF_LOGGING
7241                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7242                         struct mbuf *mat;
7243
7244                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7245                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7246                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7247                                 }
7248                         }
7249                 }
7250 #endif
7251                 /* Pull off the data */
7252                 m_adj(sp->data, to_move);
7253                 /* Now lets work our way down and compact it */
7254                 m = sp->data;
7255                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7256                         sp->data = SCTP_BUF_NEXT(m);
7257                         SCTP_BUF_NEXT(m) = NULL;
7258                         if (sp->tail_mbuf == m) {
7259                                 /*-
7260                                  * Freeing tail? TSNH since
7261                                  * we supposedly were taking less
7262                                  * than the sp->length.
7263                                  */
7264 #ifdef INVARIANTS
7265                                 panic("Huh, freing tail? - TSNH");
7266 #else
7267                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7268                                 sp->tail_mbuf = sp->data = NULL;
7269                                 sp->length = 0;
7270 #endif
7271
7272                         }
7273                         sctp_m_free(m);
7274                         m = sp->data;
7275                 }
7276         }
7277         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7278                 chk->copy_by_ref = 1;
7279         } else {
7280                 chk->copy_by_ref = 0;
7281         }
7282         /*
7283          * get last_mbuf and counts of mb useage This is ugly but hopefully
7284          * its only one mbuf.
7285          */
7286         if (chk->last_mbuf == NULL) {
7287                 chk->last_mbuf = chk->data;
7288                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7289                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7290                 }
7291         }
7292         if (to_move > length) {
7293                 /*- This should not happen either
7294                  * since we always lower to_move to the size
7295                  * of sp->length if its larger.
7296                  */
7297 #ifdef INVARIANTS
7298                 panic("Huh, how can to_move be larger?");
7299 #else
7300                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7301                 sp->length = 0;
7302 #endif
7303         } else {
7304                 atomic_subtract_int(&sp->length, to_move);
7305         }
7306         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7307                 /* Not enough room for a chunk header, get some */
7308                 struct mbuf *m;
7309
7310                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7311                 if (m == NULL) {
7312                         /*
7313                          * we're in trouble here. _PREPEND below will free
7314                          * all the data if there is no leading space, so we
7315                          * must put the data back and restore.
7316                          */
7317                         if (send_lock_up == 0) {
7318                                 SCTP_TCB_SEND_LOCK(stcb);
7319                                 send_lock_up = 1;
7320                         }
7321                         if (chk->data == NULL) {
7322                                 /* unsteal the data */
7323                                 sp->data = chk->data;
7324                                 sp->tail_mbuf = chk->last_mbuf;
7325                         } else {
7326                                 struct mbuf *m_tmp;
7327
7328                                 /* reassemble the data */
7329                                 m_tmp = sp->data;
7330                                 sp->data = chk->data;
7331                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7332                         }
7333                         sp->some_taken = some_taken;
7334                         atomic_add_int(&sp->length, to_move);
7335                         chk->data = NULL;
7336                         *bail = 1;
7337                         sctp_free_a_chunk(stcb, chk, so_locked);
7338                         to_move = 0;
7339                         goto out_of;
7340                 } else {
7341                         SCTP_BUF_LEN(m) = 0;
7342                         SCTP_BUF_NEXT(m) = chk->data;
7343                         chk->data = m;
7344                         M_ALIGN(chk->data, 4);
7345                 }
7346         }
7347         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7348         if (chk->data == NULL) {
7349                 /* HELP, TSNH since we assured it would not above? */
7350 #ifdef INVARIANTS
7351                 panic("prepend failes HELP?");
7352 #else
7353                 SCTP_PRINTF("prepend fails HELP?\n");
7354                 sctp_free_a_chunk(stcb, chk, so_locked);
7355 #endif
7356                 *bail = 1;
7357                 to_move = 0;
7358                 goto out_of;
7359         }
7360         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7361         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7362         chk->book_size_scale = 0;
7363         chk->sent = SCTP_DATAGRAM_UNSENT;
7364
7365         chk->flags = 0;
7366         chk->asoc = &stcb->asoc;
7367         chk->pad_inplace = 0;
7368         chk->no_fr_allowed = 0;
7369         chk->rec.data.stream_seq = strq->next_sequence_send;
7370         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7371             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7372                 strq->next_sequence_send++;
7373         }
7374         chk->rec.data.stream_number = sp->stream;
7375         chk->rec.data.payloadtype = sp->ppid;
7376         chk->rec.data.context = sp->context;
7377         chk->rec.data.doing_fast_retransmit = 0;
7378
7379         chk->rec.data.timetodrop = sp->ts;
7380         chk->flags = sp->act_flags;
7381
7382         if (sp->net) {
7383                 chk->whoTo = sp->net;
7384                 atomic_add_int(&chk->whoTo->ref_count, 1);
7385         } else
7386                 chk->whoTo = NULL;
7387
7388         if (sp->holds_key_ref) {
7389                 chk->auth_keyid = sp->auth_keyid;
7390                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7391                 chk->holds_key_ref = 1;
7392         }
7393         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7394         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7395                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7396                     (uintptr_t) stcb, sp->length,
7397                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7398                     chk->rec.data.TSN_seq);
7399         }
7400         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7401         /*
7402          * Put the rest of the things in place now. Size was done earlier in
7403          * previous loop prior to padding.
7404          */
7405
7406 #ifdef SCTP_ASOCLOG_OF_TSNS
7407         SCTP_TCB_LOCK_ASSERT(stcb);
7408         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7409                 asoc->tsn_out_at = 0;
7410                 asoc->tsn_out_wrapped = 1;
7411         }
7412         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7413         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7414         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7415         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7416         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7417         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7418         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7419         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7420         asoc->tsn_out_at++;
7421 #endif
7422
7423         dchkh->ch.chunk_type = SCTP_DATA;
7424         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7425         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7426         dchkh->dp.stream_id = htons(strq->stream_no);
7427         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7428         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7429         dchkh->ch.chunk_length = htons(chk->send_size);
7430         /* Now advance the chk->send_size by the actual pad needed. */
7431         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7432                 /* need a pad */
7433                 struct mbuf *lm;
7434                 int pads;
7435
7436                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7437                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7438                         chk->pad_inplace = 1;
7439                 }
7440                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7441                         /* pad added an mbuf */
7442                         chk->last_mbuf = lm;
7443                 }
7444                 chk->send_size += pads;
7445         }
7446         if (PR_SCTP_ENABLED(chk->flags)) {
7447                 asoc->pr_sctp_cnt++;
7448         }
7449         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7450                 /* All done pull and kill the message */
7451                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7452                 if (sp->put_last_out == 0) {
7453                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7454                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7455                             sp->sender_all_done,
7456                             sp->length,
7457                             sp->msg_is_complete,
7458                             sp->put_last_out,
7459                             send_lock_up);
7460                 }
7461                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7462                         SCTP_TCB_SEND_LOCK(stcb);
7463                         send_lock_up = 1;
7464                 }
7465                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7466                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7467                 if (sp->net) {
7468                         sctp_free_remote_addr(sp->net);
7469                         sp->net = NULL;
7470                 }
7471                 if (sp->data) {
7472                         sctp_m_freem(sp->data);
7473                         sp->data = NULL;
7474                 }
7475                 sctp_free_a_strmoq(stcb, sp, so_locked);
7476
7477                 /* we can't be locked to it */
7478                 *locked = 0;
7479                 stcb->asoc.locked_on_sending = NULL;
7480         } else {
7481                 /* more to go, we are locked */
7482                 *locked = 1;
7483         }
7484         asoc->chunks_on_out_queue++;
7485         strq->chunks_on_queues++;
7486         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7487         asoc->send_queue_cnt++;
7488 out_of:
7489         if (send_lock_up) {
7490                 SCTP_TCB_SEND_UNLOCK(stcb);
7491         }
7492         return (to_move);
7493 }
7494
7495
7496 static void
7497 sctp_fill_outqueue(struct sctp_tcb *stcb,
7498     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7499 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7500     SCTP_UNUSED
7501 #endif
7502 )
7503 {
7504         struct sctp_association *asoc;
7505         struct sctp_stream_out *strq;
7506         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7507         int locked, giveup;
7508
7509         SCTP_TCB_LOCK_ASSERT(stcb);
7510         asoc = &stcb->asoc;
7511         switch (net->ro._l_addr.sa.sa_family) {
7512 #ifdef INET
7513         case AF_INET:
7514                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7515                 break;
7516 #endif
7517 #ifdef INET6
7518         case AF_INET6:
7519                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7520                 break;
7521 #endif
7522         default:
7523                 /* TSNH */
7524                 goal_mtu = net->mtu;
7525                 break;
7526         }
7527         /* Need an allowance for the data chunk header too */
7528         goal_mtu -= sizeof(struct sctp_data_chunk);
7529
7530         /* must make even word boundary */
7531         goal_mtu &= 0xfffffffc;
7532         if (asoc->locked_on_sending) {
7533                 /* We are stuck on one stream until the message completes. */
7534                 strq = asoc->locked_on_sending;
7535                 locked = 1;
7536         } else {
7537                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7538                 locked = 0;
7539         }
7540         while ((goal_mtu > 0) && strq) {
7541                 giveup = 0;
7542                 bail = 0;
7543                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7544                     &giveup, eeor_mode, &bail, so_locked);
7545                 if (moved_how_much)
7546                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7547
7548                 if (locked) {
7549                         asoc->locked_on_sending = strq;
7550                         if ((moved_how_much == 0) || (giveup) || bail)
7551                                 /* no more to move for now */
7552                                 break;
7553                 } else {
7554                         asoc->locked_on_sending = NULL;
7555                         if ((giveup) || bail) {
7556                                 break;
7557                         }
7558                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7559                         if (strq == NULL) {
7560                                 break;
7561                         }
7562                 }
7563                 total_moved += moved_how_much;
7564                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7565                 goal_mtu &= 0xfffffffc;
7566         }
7567         if (bail)
7568                 *quit_now = 1;
7569
7570         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7571
7572         if (total_moved == 0) {
7573                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7574                     (net == stcb->asoc.primary_destination)) {
7575                         /* ran dry for primary network net */
7576                         SCTP_STAT_INCR(sctps_primary_randry);
7577                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7578                         /* ran dry with CMT on */
7579                         SCTP_STAT_INCR(sctps_cmt_randry);
7580                 }
7581         }
7582 }
7583
7584 void
7585 sctp_fix_ecn_echo(struct sctp_association *asoc)
7586 {
7587         struct sctp_tmit_chunk *chk;
7588
7589         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7590                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7591                         chk->sent = SCTP_DATAGRAM_UNSENT;
7592                 }
7593         }
7594 }
7595
7596 void
7597 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7598 {
7599         struct sctp_association *asoc;
7600         struct sctp_tmit_chunk *chk;
7601         struct sctp_stream_queue_pending *sp;
7602         unsigned int i;
7603
7604         if (net == NULL) {
7605                 return;
7606         }
7607         asoc = &stcb->asoc;
7608         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7609                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7610                         if (sp->net == net) {
7611                                 sctp_free_remote_addr(sp->net);
7612                                 sp->net = NULL;
7613                         }
7614                 }
7615         }
7616         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7617                 if (chk->whoTo == net) {
7618                         sctp_free_remote_addr(chk->whoTo);
7619                         chk->whoTo = NULL;
7620                 }
7621         }
7622 }
7623
7624 int
7625 sctp_med_chunk_output(struct sctp_inpcb *inp,
7626     struct sctp_tcb *stcb,
7627     struct sctp_association *asoc,
7628     int *num_out,
7629     int *reason_code,
7630     int control_only, int from_where,
7631     struct timeval *now, int *now_filled, int frag_point, int so_locked
7632 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7633     SCTP_UNUSED
7634 #endif
7635 )
7636 {
7637         /**
7638          * Ok this is the generic chunk service queue. we must do the
7639          * following: - Service the stream queue that is next, moving any
7640          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7641          * LAST to the out queue in one pass) and assigning TSN's - Check to
7642          * see if the cwnd/rwnd allows any output, if so we go ahead and
7643          * fomulate and send the low level chunks. Making sure to combine
7644          * any control in the control chunk queue also.
7645          */
7646         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7647         struct mbuf *outchain, *endoutchain;
7648         struct sctp_tmit_chunk *chk, *nchk;
7649
7650         /* temp arrays for unlinking */
7651         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7652         int no_fragmentflg, error;
7653         unsigned int max_rwnd_per_dest, max_send_per_dest;
7654         int one_chunk, hbflag, skip_data_for_this_net;
7655         int asconf, cookie, no_out_cnt;
7656         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7657         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7658         int tsns_sent = 0;
7659         uint32_t auth_offset = 0;
7660         struct sctp_auth_chunk *auth = NULL;
7661         uint16_t auth_keyid;
7662         int override_ok = 1;
7663         int skip_fill_up = 0;
7664         int data_auth_reqd = 0;
7665
7666         /*
7667          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7668          * destination.
7669          */
7670         int quit_now = 0;
7671
7672         *num_out = 0;
7673         auth_keyid = stcb->asoc.authinfo.active_keyid;
7674
7675         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7676             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7677             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7678                 eeor_mode = 1;
7679         } else {
7680                 eeor_mode = 0;
7681         }
7682         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7683         /*
7684          * First lets prime the pump. For each destination, if there is room
7685          * in the flight size, attempt to pull an MTU's worth out of the
7686          * stream queues into the general send_queue
7687          */
7688 #ifdef SCTP_AUDITING_ENABLED
7689         sctp_audit_log(0xC2, 2);
7690 #endif
7691         SCTP_TCB_LOCK_ASSERT(stcb);
7692         hbflag = 0;
7693         if ((control_only) || (asoc->stream_reset_outstanding))
7694                 no_data_chunks = 1;
7695         else
7696                 no_data_chunks = 0;
7697
7698         /* Nothing to possible to send? */
7699         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7700             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7701             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7702             TAILQ_EMPTY(&asoc->send_queue) &&
7703             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7704 nothing_to_send:
7705                 *reason_code = 9;
7706                 return (0);
7707         }
7708         if (asoc->peers_rwnd == 0) {
7709                 /* No room in peers rwnd */
7710                 *reason_code = 1;
7711                 if (asoc->total_flight > 0) {
7712                         /* we are allowed one chunk in flight */
7713                         no_data_chunks = 1;
7714                 }
7715         }
7716         if (stcb->asoc.ecn_echo_cnt_onq) {
7717                 /* Record where a sack goes, if any */
7718                 if (no_data_chunks &&
7719                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7720                         /* Nothing but ECNe to send - we don't do that */
7721                         goto nothing_to_send;
7722                 }
7723                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7724                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7725                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7726                                 sack_goes_to = chk->whoTo;
7727                                 break;
7728                         }
7729                 }
7730         }
7731         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7732         if (stcb->sctp_socket)
7733                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7734         else
7735                 max_send_per_dest = 0;
7736         if (no_data_chunks == 0) {
7737                 /* How many non-directed chunks are there? */
7738                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7739                         if (chk->whoTo == NULL) {
7740                                 /*
7741                                  * We already have non-directed chunks on
7742                                  * the queue, no need to do a fill-up.
7743                                  */
7744                                 skip_fill_up = 1;
7745                                 break;
7746                         }
7747                 }
7748
7749         }
7750         if ((no_data_chunks == 0) &&
7751             (skip_fill_up == 0) &&
7752             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7753                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7754                         /*
7755                          * This for loop we are in takes in each net, if
7756                          * its's got space in cwnd and has data sent to it
7757                          * (when CMT is off) then it calls
7758                          * sctp_fill_outqueue for the net. This gets data on
7759                          * the send queue for that network.
7760                          *
7761                          * In sctp_fill_outqueue TSN's are assigned and data is
7762                          * copied out of the stream buffers. Note mostly
7763                          * copy by reference (we hope).
7764                          */
7765                         net->window_probe = 0;
7766                         if ((net != stcb->asoc.alternate) &&
7767                             ((net->dest_state & SCTP_ADDR_PF) ||
7768                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7769                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7770                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7771                                         sctp_log_cwnd(stcb, net, 1,
7772                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7773                                 }
7774                                 continue;
7775                         }
7776                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7777                             (net->flight_size == 0)) {
7778                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7779                         }
7780                         if (net->flight_size >= net->cwnd) {
7781                                 /* skip this network, no room - can't fill */
7782                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7783                                         sctp_log_cwnd(stcb, net, 3,
7784                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7785                                 }
7786                                 continue;
7787                         }
7788                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7789                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7790                         }
7791                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7792                         if (quit_now) {
7793                                 /* memory alloc failure */
7794                                 no_data_chunks = 1;
7795                                 break;
7796                         }
7797                 }
7798         }
7799         /* now service each destination and send out what we can for it */
7800         /* Nothing to send? */
7801         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7802             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7803             TAILQ_EMPTY(&asoc->send_queue)) {
7804                 *reason_code = 8;
7805                 return (0);
7806         }
7807         if (asoc->sctp_cmt_on_off > 0) {
7808                 /* get the last start point */
7809                 start_at = asoc->last_net_cmt_send_started;
7810                 if (start_at == NULL) {
7811                         /* null so to beginning */
7812                         start_at = TAILQ_FIRST(&asoc->nets);
7813                 } else {
7814                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7815                         if (start_at == NULL) {
7816                                 start_at = TAILQ_FIRST(&asoc->nets);
7817                         }
7818                 }
7819                 asoc->last_net_cmt_send_started = start_at;
7820         } else {
7821                 start_at = TAILQ_FIRST(&asoc->nets);
7822         }
7823         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7824                 if (chk->whoTo == NULL) {
7825                         if (asoc->alternate) {
7826                                 chk->whoTo = asoc->alternate;
7827                         } else {
7828                                 chk->whoTo = asoc->primary_destination;
7829                         }
7830                         atomic_add_int(&chk->whoTo->ref_count, 1);
7831                 }
7832         }
7833         old_start_at = NULL;
7834 again_one_more_time:
7835         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7836                 /* how much can we send? */
7837                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7838                 if (old_start_at && (old_start_at == net)) {
7839                         /* through list ocmpletely. */
7840                         break;
7841                 }
7842                 tsns_sent = 0xa;
7843                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7844                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7845                     (net->flight_size >= net->cwnd)) {
7846                         /*
7847                          * Nothing on control or asconf and flight is full,
7848                          * we can skip even in the CMT case.
7849                          */
7850                         continue;
7851                 }
7852                 bundle_at = 0;
7853                 endoutchain = outchain = NULL;
7854                 no_fragmentflg = 1;
7855                 one_chunk = 0;
7856                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7857                         skip_data_for_this_net = 1;
7858                 } else {
7859                         skip_data_for_this_net = 0;
7860                 }
7861                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7862                         /*
7863                          * if we have a route and an ifp check to see if we
7864                          * have room to send to this guy
7865                          */
7866                         struct ifnet *ifp;
7867
7868                         ifp = net->ro.ro_rt->rt_ifp;
7869                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7870                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7871                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7872                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7873                                 }
7874                                 continue;
7875                         }
7876                 }
7877                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7878 #ifdef INET
7879                 case AF_INET:
7880                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7881                         break;
7882 #endif
7883 #ifdef INET6
7884                 case AF_INET6:
7885                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7886                         break;
7887 #endif
7888                 default:
7889                         /* TSNH */
7890                         mtu = net->mtu;
7891                         break;
7892                 }
7893                 mx_mtu = mtu;
7894                 to_out = 0;
7895                 if (mtu > asoc->peers_rwnd) {
7896                         if (asoc->total_flight > 0) {
7897                                 /* We have a packet in flight somewhere */
7898                                 r_mtu = asoc->peers_rwnd;
7899                         } else {
7900                                 /* We are always allowed to send one MTU out */
7901                                 one_chunk = 1;
7902                                 r_mtu = mtu;
7903                         }
7904                 } else {
7905                         r_mtu = mtu;
7906                 }
7907                 /************************/
7908                 /* ASCONF transmission */
7909                 /************************/
7910                 /* Now first lets go through the asconf queue */
7911                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7912                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7913                                 continue;
7914                         }
7915                         if (chk->whoTo == NULL) {
7916                                 if (asoc->alternate == NULL) {
7917                                         if (asoc->primary_destination != net) {
7918                                                 break;
7919                                         }
7920                                 } else {
7921                                         if (asoc->alternate != net) {
7922                                                 break;
7923                                         }
7924                                 }
7925                         } else {
7926                                 if (chk->whoTo != net) {
7927                                         break;
7928                                 }
7929                         }
7930                         if (chk->data == NULL) {
7931                                 break;
7932                         }
7933                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7934                             chk->sent != SCTP_DATAGRAM_RESEND) {
7935                                 break;
7936                         }
7937                         /*
7938                          * if no AUTH is yet included and this chunk
7939                          * requires it, make sure to account for it.  We
7940                          * don't apply the size until the AUTH chunk is
7941                          * actually added below in case there is no room for
7942                          * this chunk. NOTE: we overload the use of "omtu"
7943                          * here
7944                          */
7945                         if ((auth == NULL) &&
7946                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7947                             stcb->asoc.peer_auth_chunks)) {
7948                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7949                         } else
7950                                 omtu = 0;
7951                         /* Here we do NOT factor the r_mtu */
7952                         if ((chk->send_size < (int)(mtu - omtu)) ||
7953                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7954                                 /*
7955                                  * We probably should glom the mbuf chain
7956                                  * from the chk->data for control but the
7957                                  * problem is it becomes yet one more level
7958                                  * of tracking to do if for some reason
7959                                  * output fails. Then I have got to
7960                                  * reconstruct the merged control chain.. el
7961                                  * yucko.. for now we take the easy way and
7962                                  * do the copy
7963                                  */
7964                                 /*
7965                                  * Add an AUTH chunk, if chunk requires it
7966                                  * save the offset into the chain for AUTH
7967                                  */
7968                                 if ((auth == NULL) &&
7969                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7970                                     stcb->asoc.peer_auth_chunks))) {
7971                                         outchain = sctp_add_auth_chunk(outchain,
7972                                             &endoutchain,
7973                                             &auth,
7974                                             &auth_offset,
7975                                             stcb,
7976                                             chk->rec.chunk_id.id);
7977                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7978                                 }
7979                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7980                                     (int)chk->rec.chunk_id.can_take_data,
7981                                     chk->send_size, chk->copy_by_ref);
7982                                 if (outchain == NULL) {
7983                                         *reason_code = 8;
7984                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7985                                         return (ENOMEM);
7986                                 }
7987                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7988                                 /* update our MTU size */
7989                                 if (mtu > (chk->send_size + omtu))
7990                                         mtu -= (chk->send_size + omtu);
7991                                 else
7992                                         mtu = 0;
7993                                 to_out += (chk->send_size + omtu);
7994                                 /* Do clear IP_DF ? */
7995                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7996                                         no_fragmentflg = 0;
7997                                 }
7998                                 if (chk->rec.chunk_id.can_take_data)
7999                                         chk->data = NULL;
8000                                 /*
8001                                  * set hb flag since we can use these for
8002                                  * RTO
8003                                  */
8004                                 hbflag = 1;
8005                                 asconf = 1;
8006                                 /*
8007                                  * should sysctl this: don't bundle data
8008                                  * with ASCONF since it requires AUTH
8009                                  */
8010                                 no_data_chunks = 1;
8011                                 chk->sent = SCTP_DATAGRAM_SENT;
8012                                 if (chk->whoTo == NULL) {
8013                                         chk->whoTo = net;
8014                                         atomic_add_int(&net->ref_count, 1);
8015                                 }
8016                                 chk->snd_count++;
8017                                 if (mtu == 0) {
8018                                         /*
8019                                          * Ok we are out of room but we can
8020                                          * output without effecting the
8021                                          * flight size since this little guy
8022                                          * is a control only packet.
8023                                          */
8024                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8025                                         /*
8026                                          * do NOT clear the asconf flag as
8027                                          * it is used to do appropriate
8028                                          * source address selection.
8029                                          */
8030                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8031                                             (struct sockaddr *)&net->ro._l_addr,
8032                                             outchain, auth_offset, auth,
8033                                             stcb->asoc.authinfo.active_keyid,
8034                                             no_fragmentflg, 0, asconf,
8035                                             inp->sctp_lport, stcb->rport,
8036                                             htonl(stcb->asoc.peer_vtag),
8037                                             net->port, NULL,
8038                                             0, 0,
8039                                             so_locked))) {
8040                                                 if (error == ENOBUFS) {
8041                                                         asoc->ifp_had_enobuf = 1;
8042                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8043                                                 }
8044                                                 if (from_where == 0) {
8045                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8046                                                 }
8047                                                 if (*now_filled == 0) {
8048                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8049                                                         *now_filled = 1;
8050                                                         *now = net->last_sent_time;
8051                                                 } else {
8052                                                         net->last_sent_time = *now;
8053                                                 }
8054                                                 hbflag = 0;
8055                                                 /* error, could not output */
8056                                                 if (error == EHOSTUNREACH) {
8057                                                         /*
8058                                                          * Destination went
8059                                                          * unreachable
8060                                                          * during this send
8061                                                          */
8062                                                         sctp_move_chunks_from_net(stcb, net);
8063                                                 }
8064                                                 *reason_code = 7;
8065                                                 continue;
8066                                         } else
8067                                                 asoc->ifp_had_enobuf = 0;
8068                                         if (*now_filled == 0) {
8069                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8070                                                 *now_filled = 1;
8071                                                 *now = net->last_sent_time;
8072                                         } else {
8073                                                 net->last_sent_time = *now;
8074                                         }
8075                                         hbflag = 0;
8076                                         /*
8077                                          * increase the number we sent, if a
8078                                          * cookie is sent we don't tell them
8079                                          * any was sent out.
8080                                          */
8081                                         outchain = endoutchain = NULL;
8082                                         auth = NULL;
8083                                         auth_offset = 0;
8084                                         if (!no_out_cnt)
8085                                                 *num_out += ctl_cnt;
8086                                         /* recalc a clean slate and setup */
8087                                         switch (net->ro._l_addr.sa.sa_family) {
8088 #ifdef INET
8089                                         case AF_INET:
8090                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8091                                                 break;
8092 #endif
8093 #ifdef INET6
8094                                         case AF_INET6:
8095                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8096                                                 break;
8097 #endif
8098                                         default:
8099                                                 /* TSNH */
8100                                                 mtu = net->mtu;
8101                                                 break;
8102                                         }
8103                                         to_out = 0;
8104                                         no_fragmentflg = 1;
8105                                 }
8106                         }
8107                 }
8108                 /************************/
8109                 /* Control transmission */
8110                 /************************/
8111                 /* Now first lets go through the control queue */
8112                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8113                         if ((sack_goes_to) &&
8114                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8115                             (chk->whoTo != sack_goes_to)) {
8116                                 /*
8117                                  * if we have a sack in queue, and we are
8118                                  * looking at an ecn echo that is NOT queued
8119                                  * to where the sack is going..
8120                                  */
8121                                 if (chk->whoTo == net) {
8122                                         /*
8123                                          * Don't transmit it to where its
8124                                          * going (current net)
8125                                          */
8126                                         continue;
8127                                 } else if (sack_goes_to == net) {
8128                                         /*
8129                                          * But do transmit it to this
8130                                          * address
8131                                          */
8132                                         goto skip_net_check;
8133                                 }
8134                         }
8135                         if (chk->whoTo == NULL) {
8136                                 if (asoc->alternate == NULL) {
8137                                         if (asoc->primary_destination != net) {
8138                                                 continue;
8139                                         }
8140                                 } else {
8141                                         if (asoc->alternate != net) {
8142                                                 continue;
8143                                         }
8144                                 }
8145                         } else {
8146                                 if (chk->whoTo != net) {
8147                                         continue;
8148                                 }
8149                         }
8150         skip_net_check:
8151                         if (chk->data == NULL) {
8152                                 continue;
8153                         }
8154                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8155                                 /*
8156                                  * It must be unsent. Cookies and ASCONF's
8157                                  * hang around but there timers will force
8158                                  * when marked for resend.
8159                                  */
8160                                 continue;
8161                         }
8162                         /*
8163                          * if no AUTH is yet included and this chunk
8164                          * requires it, make sure to account for it.  We
8165                          * don't apply the size until the AUTH chunk is
8166                          * actually added below in case there is no room for
8167                          * this chunk. NOTE: we overload the use of "omtu"
8168                          * here
8169                          */
8170                         if ((auth == NULL) &&
8171                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8172                             stcb->asoc.peer_auth_chunks)) {
8173                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8174                         } else
8175                                 omtu = 0;
8176                         /* Here we do NOT factor the r_mtu */
8177                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8178                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8179                                 /*
8180                                  * We probably should glom the mbuf chain
8181                                  * from the chk->data for control but the
8182                                  * problem is it becomes yet one more level
8183                                  * of tracking to do if for some reason
8184                                  * output fails. Then I have got to
8185                                  * reconstruct the merged control chain.. el
8186                                  * yucko.. for now we take the easy way and
8187                                  * do the copy
8188                                  */
8189                                 /*
8190                                  * Add an AUTH chunk, if chunk requires it
8191                                  * save the offset into the chain for AUTH
8192                                  */
8193                                 if ((auth == NULL) &&
8194                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8195                                     stcb->asoc.peer_auth_chunks))) {
8196                                         outchain = sctp_add_auth_chunk(outchain,
8197                                             &endoutchain,
8198                                             &auth,
8199                                             &auth_offset,
8200                                             stcb,
8201                                             chk->rec.chunk_id.id);
8202                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8203                                 }
8204                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8205                                     (int)chk->rec.chunk_id.can_take_data,
8206                                     chk->send_size, chk->copy_by_ref);
8207                                 if (outchain == NULL) {
8208                                         *reason_code = 8;
8209                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8210                                         return (ENOMEM);
8211                                 }
8212                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8213                                 /* update our MTU size */
8214                                 if (mtu > (chk->send_size + omtu))
8215                                         mtu -= (chk->send_size + omtu);
8216                                 else
8217                                         mtu = 0;
8218                                 to_out += (chk->send_size + omtu);
8219                                 /* Do clear IP_DF ? */
8220                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8221                                         no_fragmentflg = 0;
8222                                 }
8223                                 if (chk->rec.chunk_id.can_take_data)
8224                                         chk->data = NULL;
8225                                 /* Mark things to be removed, if needed */
8226                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8227                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8228                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8229                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8230                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8231                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8232                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8233                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8234                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8235                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8236                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8237                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8238                                                 hbflag = 1;
8239                                         }
8240                                         /* remove these chunks at the end */
8241                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8242                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8243                                                 /* turn off the timer */
8244                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8245                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8246                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8247                                                 }
8248                                         }
8249                                         ctl_cnt++;
8250                                 } else {
8251                                         /*
8252                                          * Other chunks, since they have
8253                                          * timers running (i.e. COOKIE) we
8254                                          * just "trust" that it gets sent or
8255                                          * retransmitted.
8256                                          */
8257                                         ctl_cnt++;
8258                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8259                                                 cookie = 1;
8260                                                 no_out_cnt = 1;
8261                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8262                                                 /*
8263                                                  * Increment ecne send count
8264                                                  * here this means we may be
8265                                                  * over-zealous in our
8266                                                  * counting if the send
8267                                                  * fails, but its the best
8268                                                  * place to do it (we used
8269                                                  * to do it in the queue of
8270                                                  * the chunk, but that did
8271                                                  * not tell how many times
8272                                                  * it was sent.
8273                                                  */
8274                                                 SCTP_STAT_INCR(sctps_sendecne);
8275                                         }
8276                                         chk->sent = SCTP_DATAGRAM_SENT;
8277                                         if (chk->whoTo == NULL) {
8278                                                 chk->whoTo = net;
8279                                                 atomic_add_int(&net->ref_count, 1);
8280                                         }
8281                                         chk->snd_count++;
8282                                 }
8283                                 if (mtu == 0) {
8284                                         /*
8285                                          * Ok we are out of room but we can
8286                                          * output without effecting the
8287                                          * flight size since this little guy
8288                                          * is a control only packet.
8289                                          */
8290                                         if (asconf) {
8291                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8292                                                 /*
8293                                                  * do NOT clear the asconf
8294                                                  * flag as it is used to do
8295                                                  * appropriate source
8296                                                  * address selection.
8297                                                  */
8298                                         }
8299                                         if (cookie) {
8300                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8301                                                 cookie = 0;
8302                                         }
8303                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8304                                             (struct sockaddr *)&net->ro._l_addr,
8305                                             outchain,
8306                                             auth_offset, auth,
8307                                             stcb->asoc.authinfo.active_keyid,
8308                                             no_fragmentflg, 0, asconf,
8309                                             inp->sctp_lport, stcb->rport,
8310                                             htonl(stcb->asoc.peer_vtag),
8311                                             net->port, NULL,
8312                                             0, 0,
8313                                             so_locked))) {
8314                                                 if (error == ENOBUFS) {
8315                                                         asoc->ifp_had_enobuf = 1;
8316                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8317                                                 }
8318                                                 if (from_where == 0) {
8319                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8320                                                 }
8321                                                 /* error, could not output */
8322                                                 if (hbflag) {
8323                                                         if (*now_filled == 0) {
8324                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8325                                                                 *now_filled = 1;
8326                                                                 *now = net->last_sent_time;
8327                                                         } else {
8328                                                                 net->last_sent_time = *now;
8329                                                         }
8330                                                         hbflag = 0;
8331                                                 }
8332                                                 if (error == EHOSTUNREACH) {
8333                                                         /*
8334                                                          * Destination went
8335                                                          * unreachable
8336                                                          * during this send
8337                                                          */
8338                                                         sctp_move_chunks_from_net(stcb, net);
8339                                                 }
8340                                                 *reason_code = 7;
8341                                                 continue;
8342                                         } else
8343                                                 asoc->ifp_had_enobuf = 0;
8344                                         /* Only HB or ASCONF advances time */
8345                                         if (hbflag) {
8346                                                 if (*now_filled == 0) {
8347                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8348                                                         *now_filled = 1;
8349                                                         *now = net->last_sent_time;
8350                                                 } else {
8351                                                         net->last_sent_time = *now;
8352                                                 }
8353                                                 hbflag = 0;
8354                                         }
8355                                         /*
8356                                          * increase the number we sent, if a
8357                                          * cookie is sent we don't tell them
8358                                          * any was sent out.
8359                                          */
8360                                         outchain = endoutchain = NULL;
8361                                         auth = NULL;
8362                                         auth_offset = 0;
8363                                         if (!no_out_cnt)
8364                                                 *num_out += ctl_cnt;
8365                                         /* recalc a clean slate and setup */
8366                                         switch (net->ro._l_addr.sa.sa_family) {
8367 #ifdef INET
8368                                         case AF_INET:
8369                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8370                                                 break;
8371 #endif
8372 #ifdef INET6
8373                                         case AF_INET6:
8374                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8375                                                 break;
8376 #endif
8377                                         default:
8378                                                 /* TSNH */
8379                                                 mtu = net->mtu;
8380                                                 break;
8381                                         }
8382                                         to_out = 0;
8383                                         no_fragmentflg = 1;
8384                                 }
8385                         }
8386                 }
8387                 /* JRI: if dest is in PF state, do not send data to it */
8388                 if ((asoc->sctp_cmt_on_off > 0) &&
8389                     (net != stcb->asoc.alternate) &&
8390                     (net->dest_state & SCTP_ADDR_PF)) {
8391                         goto no_data_fill;
8392                 }
8393                 if (net->flight_size >= net->cwnd) {
8394                         goto no_data_fill;
8395                 }
8396                 if ((asoc->sctp_cmt_on_off > 0) &&
8397                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8398                     (net->flight_size > max_rwnd_per_dest)) {
8399                         goto no_data_fill;
8400                 }
8401                 /*
8402                  * We need a specific accounting for the usage of the send
8403                  * buffer. We also need to check the number of messages per
8404                  * net. For now, this is better than nothing and it disabled
8405                  * by default...
8406                  */
8407                 if ((asoc->sctp_cmt_on_off > 0) &&
8408                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8409                     (max_send_per_dest > 0) &&
8410                     (net->flight_size > max_send_per_dest)) {
8411                         goto no_data_fill;
8412                 }
8413                 /*********************/
8414                 /* Data transmission */
8415                 /*********************/
8416                 /*
8417                  * if AUTH for DATA is required and no AUTH has been added
8418                  * yet, account for this in the mtu now... if no data can be
8419                  * bundled, this adjustment won't matter anyways since the
8420                  * packet will be going out...
8421                  */
8422                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8423                     stcb->asoc.peer_auth_chunks);
8424                 if (data_auth_reqd && (auth == NULL)) {
8425                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8426                 }
8427                 /* now lets add any data within the MTU constraints */
8428                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8429 #ifdef INET
8430                 case AF_INET:
8431                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8432                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8433                         else
8434                                 omtu = 0;
8435                         break;
8436 #endif
8437 #ifdef INET6
8438                 case AF_INET6:
8439                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8440                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8441                         else
8442                                 omtu = 0;
8443                         break;
8444 #endif
8445                 default:
8446                         /* TSNH */
8447                         omtu = 0;
8448                         break;
8449                 }
8450                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8451                     (skip_data_for_this_net == 0)) ||
8452                     (cookie)) {
8453                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8454                                 if (no_data_chunks) {
8455                                         /* let only control go out */
8456                                         *reason_code = 1;
8457                                         break;
8458                                 }
8459                                 if (net->flight_size >= net->cwnd) {
8460                                         /* skip this net, no room for data */
8461                                         *reason_code = 2;
8462                                         break;
8463                                 }
8464                                 if ((chk->whoTo != NULL) &&
8465                                     (chk->whoTo != net)) {
8466                                         /* Don't send the chunk on this net */
8467                                         continue;
8468                                 }
8469                                 if (asoc->sctp_cmt_on_off == 0) {
8470                                         if ((asoc->alternate) &&
8471                                             (asoc->alternate != net) &&
8472                                             (chk->whoTo == NULL)) {
8473                                                 continue;
8474                                         } else if ((net != asoc->primary_destination) &&
8475                                                     (asoc->alternate == NULL) &&
8476                                             (chk->whoTo == NULL)) {
8477                                                 continue;
8478                                         }
8479                                 }
8480                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8481                                         /*-
8482                                          * strange, we have a chunk that is
8483                                          * to big for its destination and
8484                                          * yet no fragment ok flag.
8485                                          * Something went wrong when the
8486                                          * PMTU changed...we did not mark
8487                                          * this chunk for some reason?? I
8488                                          * will fix it here by letting IP
8489                                          * fragment it for now and printing
8490                                          * a warning. This really should not
8491                                          * happen ...
8492                                          */
8493                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8494                                             chk->send_size, mtu);
8495                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8496                                 }
8497                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8498                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8499                                         struct sctp_data_chunk *dchkh;
8500
8501                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8502                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8503                                 }
8504                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8505                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8506                                         /* ok we will add this one */
8507
8508                                         /*
8509                                          * Add an AUTH chunk, if chunk
8510                                          * requires it, save the offset into
8511                                          * the chain for AUTH
8512                                          */
8513                                         if (data_auth_reqd) {
8514                                                 if (auth == NULL) {
8515                                                         outchain = sctp_add_auth_chunk(outchain,
8516                                                             &endoutchain,
8517                                                             &auth,
8518                                                             &auth_offset,
8519                                                             stcb,
8520                                                             SCTP_DATA);
8521                                                         auth_keyid = chk->auth_keyid;
8522                                                         override_ok = 0;
8523                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8524                                                 } else if (override_ok) {
8525                                                         /*
8526                                                          * use this data's
8527                                                          * keyid
8528                                                          */
8529                                                         auth_keyid = chk->auth_keyid;
8530                                                         override_ok = 0;
8531                                                 } else if (auth_keyid != chk->auth_keyid) {
8532                                                         /*
8533                                                          * different keyid,
8534                                                          * so done bundling
8535                                                          */
8536                                                         break;
8537                                                 }
8538                                         }
8539                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8540                                             chk->send_size, chk->copy_by_ref);
8541                                         if (outchain == NULL) {
8542                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8543                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8544                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8545                                                 }
8546                                                 *reason_code = 3;
8547                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8548                                                 return (ENOMEM);
8549                                         }
8550                                         /* upate our MTU size */
8551                                         /* Do clear IP_DF ? */
8552                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8553                                                 no_fragmentflg = 0;
8554                                         }
8555                                         /* unsigned subtraction of mtu */
8556                                         if (mtu > chk->send_size)
8557                                                 mtu -= chk->send_size;
8558                                         else
8559                                                 mtu = 0;
8560                                         /* unsigned subtraction of r_mtu */
8561                                         if (r_mtu > chk->send_size)
8562                                                 r_mtu -= chk->send_size;
8563                                         else
8564                                                 r_mtu = 0;
8565
8566                                         to_out += chk->send_size;
8567                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8568 #ifdef INVARIANTS
8569                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8570 #else
8571                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8572                                                     mx_mtu, to_out);
8573 #endif
8574                                         }
8575                                         chk->window_probe = 0;
8576                                         data_list[bundle_at++] = chk;
8577                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8578                                                 break;
8579                                         }
8580                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8581                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8582                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8583                                                 } else {
8584                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8585                                                 }
8586                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8587                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8588                                                         /*
8589                                                          * Count number of
8590                                                          * user msg's that
8591                                                          * were fragmented
8592                                                          * we do this by
8593                                                          * counting when we
8594                                                          * see a LAST
8595                                                          * fragment only.
8596                                                          */
8597                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8598                                         }
8599                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8600                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8601                                                         data_list[0]->window_probe = 1;
8602                                                         net->window_probe = 1;
8603                                                 }
8604                                                 break;
8605                                         }
8606                                 } else {
8607                                         /*
8608                                          * Must be sent in order of the
8609                                          * TSN's (on a network)
8610                                          */
8611                                         break;
8612                                 }
8613                         }       /* for (chunk gather loop for this net) */
8614                 }               /* if asoc.state OPEN */
8615 no_data_fill:
8616                 /* Is there something to send for this destination? */
8617                 if (outchain) {
8618                         /* We may need to start a control timer or two */
8619                         if (asconf) {
8620                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8621                                     stcb, net);
8622                                 /*
8623                                  * do NOT clear the asconf flag as it is
8624                                  * used to do appropriate source address
8625                                  * selection.
8626                                  */
8627                         }
8628                         if (cookie) {
8629                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8630                                 cookie = 0;
8631                         }
8632                         /* must start a send timer if data is being sent */
8633                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8634                                 /*
8635                                  * no timer running on this destination
8636                                  * restart it.
8637                                  */
8638                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8639                         }
8640                         /* Now send it, if there is anything to send :> */
8641                         if ((error = sctp_lowlevel_chunk_output(inp,
8642                             stcb,
8643                             net,
8644                             (struct sockaddr *)&net->ro._l_addr,
8645                             outchain,
8646                             auth_offset,
8647                             auth,
8648                             auth_keyid,
8649                             no_fragmentflg,
8650                             bundle_at,
8651                             asconf,
8652                             inp->sctp_lport, stcb->rport,
8653                             htonl(stcb->asoc.peer_vtag),
8654                             net->port, NULL,
8655                             0, 0,
8656                             so_locked))) {
8657                                 /* error, we could not output */
8658                                 if (error == ENOBUFS) {
8659                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8660                                         asoc->ifp_had_enobuf = 1;
8661                                 }
8662                                 if (from_where == 0) {
8663                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8664                                 }
8665                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8666                                 if (hbflag) {
8667                                         if (*now_filled == 0) {
8668                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8669                                                 *now_filled = 1;
8670                                                 *now = net->last_sent_time;
8671                                         } else {
8672                                                 net->last_sent_time = *now;
8673                                         }
8674                                         hbflag = 0;
8675                                 }
8676                                 if (error == EHOSTUNREACH) {
8677                                         /*
8678                                          * Destination went unreachable
8679                                          * during this send
8680                                          */
8681                                         sctp_move_chunks_from_net(stcb, net);
8682                                 }
8683                                 *reason_code = 6;
8684                                 /*-
8685                                  * I add this line to be paranoid. As far as
8686                                  * I can tell the continue, takes us back to
8687                                  * the top of the for, but just to make sure
8688                                  * I will reset these again here.
8689                                  */
8690                                 ctl_cnt = bundle_at = 0;
8691                                 continue;       /* This takes us back to the
8692                                                  * for() for the nets. */
8693                         } else {
8694                                 asoc->ifp_had_enobuf = 0;
8695                         }
8696                         endoutchain = NULL;
8697                         auth = NULL;
8698                         auth_offset = 0;
8699                         if (bundle_at || hbflag) {
8700                                 /* For data/asconf and hb set time */
8701                                 if (*now_filled == 0) {
8702                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8703                                         *now_filled = 1;
8704                                         *now = net->last_sent_time;
8705                                 } else {
8706                                         net->last_sent_time = *now;
8707                                 }
8708                         }
8709                         if (!no_out_cnt) {
8710                                 *num_out += (ctl_cnt + bundle_at);
8711                         }
8712                         if (bundle_at) {
8713                                 /* setup for a RTO measurement */
8714                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8715                                 /* fill time if not already filled */
8716                                 if (*now_filled == 0) {
8717                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8718                                         *now_filled = 1;
8719                                         *now = asoc->time_last_sent;
8720                                 } else {
8721                                         asoc->time_last_sent = *now;
8722                                 }
8723                                 if (net->rto_needed) {
8724                                         data_list[0]->do_rtt = 1;
8725                                         net->rto_needed = 0;
8726                                 }
8727                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8728                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8729                         }
8730                         if (one_chunk) {
8731                                 break;
8732                         }
8733                 }
8734                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8735                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8736                 }
8737         }
8738         if (old_start_at == NULL) {
8739                 old_start_at = start_at;
8740                 start_at = TAILQ_FIRST(&asoc->nets);
8741                 if (old_start_at)
8742                         goto again_one_more_time;
8743         }
8744         /*
8745          * At the end there should be no NON timed chunks hanging on this
8746          * queue.
8747          */
8748         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8749                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8750         }
8751         if ((*num_out == 0) && (*reason_code == 0)) {
8752                 *reason_code = 4;
8753         } else {
8754                 *reason_code = 5;
8755         }
8756         sctp_clean_up_ctl(stcb, asoc, so_locked);
8757         return (0);
8758 }
8759
8760 void
8761 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8762 {
8763         /*-
8764          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8765          * the control chunk queue.
8766          */
8767         struct sctp_chunkhdr *hdr;
8768         struct sctp_tmit_chunk *chk;
8769         struct mbuf *mat;
8770
8771         SCTP_TCB_LOCK_ASSERT(stcb);
8772         sctp_alloc_a_chunk(stcb, chk);
8773         if (chk == NULL) {
8774                 /* no memory */
8775                 sctp_m_freem(op_err);
8776                 return;
8777         }
8778         chk->copy_by_ref = 0;
8779         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8780         if (op_err == NULL) {
8781                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8782                 return;
8783         }
8784         chk->send_size = 0;
8785         mat = op_err;
8786         while (mat != NULL) {
8787                 chk->send_size += SCTP_BUF_LEN(mat);
8788                 mat = SCTP_BUF_NEXT(mat);
8789         }
8790         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8791         chk->rec.chunk_id.can_take_data = 1;
8792         chk->sent = SCTP_DATAGRAM_UNSENT;
8793         chk->snd_count = 0;
8794         chk->flags = 0;
8795         chk->asoc = &stcb->asoc;
8796         chk->data = op_err;
8797         chk->whoTo = NULL;
8798         hdr = mtod(op_err, struct sctp_chunkhdr *);
8799         hdr->chunk_type = SCTP_OPERATION_ERROR;
8800         hdr->chunk_flags = 0;
8801         hdr->chunk_length = htons(chk->send_size);
8802         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8803             chk,
8804             sctp_next);
8805         chk->asoc->ctrl_queue_cnt++;
8806 }
8807
8808 int
8809 sctp_send_cookie_echo(struct mbuf *m,
8810     int offset,
8811     struct sctp_tcb *stcb,
8812     struct sctp_nets *net)
8813 {
8814         /*-
8815          * pull out the cookie and put it at the front of the control chunk
8816          * queue.
8817          */
8818         int at;
8819         struct mbuf *cookie;
8820         struct sctp_paramhdr parm, *phdr;
8821         struct sctp_chunkhdr *hdr;
8822         struct sctp_tmit_chunk *chk;
8823         uint16_t ptype, plen;
8824
8825         /* First find the cookie in the param area */
8826         cookie = NULL;
8827         at = offset + sizeof(struct sctp_init_chunk);
8828
8829         SCTP_TCB_LOCK_ASSERT(stcb);
8830         do {
8831                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8832                 if (phdr == NULL) {
8833                         return (-3);
8834                 }
8835                 ptype = ntohs(phdr->param_type);
8836                 plen = ntohs(phdr->param_length);
8837                 if (ptype == SCTP_STATE_COOKIE) {
8838                         int pad;
8839
8840                         /* found the cookie */
8841                         if ((pad = (plen % 4))) {
8842                                 plen += 4 - pad;
8843                         }
8844                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8845                         if (cookie == NULL) {
8846                                 /* No memory */
8847                                 return (-2);
8848                         }
8849 #ifdef SCTP_MBUF_LOGGING
8850                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8851                                 struct mbuf *mat;
8852
8853                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8854                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8855                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8856                                         }
8857                                 }
8858                         }
8859 #endif
8860                         break;
8861                 }
8862                 at += SCTP_SIZE32(plen);
8863         } while (phdr);
8864         if (cookie == NULL) {
8865                 /* Did not find the cookie */
8866                 return (-3);
8867         }
8868         /* ok, we got the cookie lets change it into a cookie echo chunk */
8869
8870         /* first the change from param to cookie */
8871         hdr = mtod(cookie, struct sctp_chunkhdr *);
8872         hdr->chunk_type = SCTP_COOKIE_ECHO;
8873         hdr->chunk_flags = 0;
8874         /* get the chunk stuff now and place it in the FRONT of the queue */
8875         sctp_alloc_a_chunk(stcb, chk);
8876         if (chk == NULL) {
8877                 /* no memory */
8878                 sctp_m_freem(cookie);
8879                 return (-5);
8880         }
8881         chk->copy_by_ref = 0;
8882         chk->send_size = plen;
8883         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8884         chk->rec.chunk_id.can_take_data = 0;
8885         chk->sent = SCTP_DATAGRAM_UNSENT;
8886         chk->snd_count = 0;
8887         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8888         chk->asoc = &stcb->asoc;
8889         chk->data = cookie;
8890         chk->whoTo = net;
8891         atomic_add_int(&chk->whoTo->ref_count, 1);
8892         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8893         chk->asoc->ctrl_queue_cnt++;
8894         return (0);
8895 }
8896
8897 void
8898 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8899     struct mbuf *m,
8900     int offset,
8901     int chk_length,
8902     struct sctp_nets *net)
8903 {
8904         /*
8905          * take a HB request and make it into a HB ack and send it.
8906          */
8907         struct mbuf *outchain;
8908         struct sctp_chunkhdr *chdr;
8909         struct sctp_tmit_chunk *chk;
8910
8911
8912         if (net == NULL)
8913                 /* must have a net pointer */
8914                 return;
8915
8916         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
8917         if (outchain == NULL) {
8918                 /* gak out of memory */
8919                 return;
8920         }
8921 #ifdef SCTP_MBUF_LOGGING
8922         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8923                 struct mbuf *mat;
8924
8925                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8926                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8927                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8928                         }
8929                 }
8930         }
8931 #endif
8932         chdr = mtod(outchain, struct sctp_chunkhdr *);
8933         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8934         chdr->chunk_flags = 0;
8935         if (chk_length % 4) {
8936                 /* need pad */
8937                 uint32_t cpthis = 0;
8938                 int padlen;
8939
8940                 padlen = 4 - (chk_length % 4);
8941                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8942         }
8943         sctp_alloc_a_chunk(stcb, chk);
8944         if (chk == NULL) {
8945                 /* no memory */
8946                 sctp_m_freem(outchain);
8947                 return;
8948         }
8949         chk->copy_by_ref = 0;
8950         chk->send_size = chk_length;
8951         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8952         chk->rec.chunk_id.can_take_data = 1;
8953         chk->sent = SCTP_DATAGRAM_UNSENT;
8954         chk->snd_count = 0;
8955         chk->flags = 0;
8956         chk->asoc = &stcb->asoc;
8957         chk->data = outchain;
8958         chk->whoTo = net;
8959         atomic_add_int(&chk->whoTo->ref_count, 1);
8960         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8961         chk->asoc->ctrl_queue_cnt++;
8962 }
8963
8964 void
8965 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8966 {
8967         /* formulate and queue a cookie-ack back to sender */
8968         struct mbuf *cookie_ack;
8969         struct sctp_chunkhdr *hdr;
8970         struct sctp_tmit_chunk *chk;
8971
8972         SCTP_TCB_LOCK_ASSERT(stcb);
8973
8974         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
8975         if (cookie_ack == NULL) {
8976                 /* no mbuf's */
8977                 return;
8978         }
8979         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8980         sctp_alloc_a_chunk(stcb, chk);
8981         if (chk == NULL) {
8982                 /* no memory */
8983                 sctp_m_freem(cookie_ack);
8984                 return;
8985         }
8986         chk->copy_by_ref = 0;
8987         chk->send_size = sizeof(struct sctp_chunkhdr);
8988         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8989         chk->rec.chunk_id.can_take_data = 1;
8990         chk->sent = SCTP_DATAGRAM_UNSENT;
8991         chk->snd_count = 0;
8992         chk->flags = 0;
8993         chk->asoc = &stcb->asoc;
8994         chk->data = cookie_ack;
8995         if (chk->asoc->last_control_chunk_from != NULL) {
8996                 chk->whoTo = chk->asoc->last_control_chunk_from;
8997                 atomic_add_int(&chk->whoTo->ref_count, 1);
8998         } else {
8999                 chk->whoTo = NULL;
9000         }
9001         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9002         hdr->chunk_type = SCTP_COOKIE_ACK;
9003         hdr->chunk_flags = 0;
9004         hdr->chunk_length = htons(chk->send_size);
9005         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9006         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9007         chk->asoc->ctrl_queue_cnt++;
9008         return;
9009 }
9010
9011
9012 void
9013 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9014 {
9015         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9016         struct mbuf *m_shutdown_ack;
9017         struct sctp_shutdown_ack_chunk *ack_cp;
9018         struct sctp_tmit_chunk *chk;
9019
9020         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9021         if (m_shutdown_ack == NULL) {
9022                 /* no mbuf's */
9023                 return;
9024         }
9025         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9026         sctp_alloc_a_chunk(stcb, chk);
9027         if (chk == NULL) {
9028                 /* no memory */
9029                 sctp_m_freem(m_shutdown_ack);
9030                 return;
9031         }
9032         chk->copy_by_ref = 0;
9033         chk->send_size = sizeof(struct sctp_chunkhdr);
9034         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9035         chk->rec.chunk_id.can_take_data = 1;
9036         chk->sent = SCTP_DATAGRAM_UNSENT;
9037         chk->snd_count = 0;
9038         chk->flags = 0;
9039         chk->asoc = &stcb->asoc;
9040         chk->data = m_shutdown_ack;
9041         chk->whoTo = net;
9042         if (chk->whoTo) {
9043                 atomic_add_int(&chk->whoTo->ref_count, 1);
9044         }
9045         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9046         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9047         ack_cp->ch.chunk_flags = 0;
9048         ack_cp->ch.chunk_length = htons(chk->send_size);
9049         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9050         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9051         chk->asoc->ctrl_queue_cnt++;
9052         return;
9053 }
9054
9055 void
9056 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9057 {
9058         /* formulate and queue a SHUTDOWN to the sender */
9059         struct mbuf *m_shutdown;
9060         struct sctp_shutdown_chunk *shutdown_cp;
9061         struct sctp_tmit_chunk *chk;
9062
9063         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9064         if (m_shutdown == NULL) {
9065                 /* no mbuf's */
9066                 return;
9067         }
9068         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9069         sctp_alloc_a_chunk(stcb, chk);
9070         if (chk == NULL) {
9071                 /* no memory */
9072                 sctp_m_freem(m_shutdown);
9073                 return;
9074         }
9075         chk->copy_by_ref = 0;
9076         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9077         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9078         chk->rec.chunk_id.can_take_data = 1;
9079         chk->sent = SCTP_DATAGRAM_UNSENT;
9080         chk->snd_count = 0;
9081         chk->flags = 0;
9082         chk->asoc = &stcb->asoc;
9083         chk->data = m_shutdown;
9084         chk->whoTo = net;
9085         if (chk->whoTo) {
9086                 atomic_add_int(&chk->whoTo->ref_count, 1);
9087         }
9088         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9089         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9090         shutdown_cp->ch.chunk_flags = 0;
9091         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9092         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9093         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9094         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9095         chk->asoc->ctrl_queue_cnt++;
9096         return;
9097 }
9098
9099 void
9100 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9101 {
9102         /*
9103          * formulate and queue an ASCONF to the peer. ASCONF parameters
9104          * should be queued on the assoc queue.
9105          */
9106         struct sctp_tmit_chunk *chk;
9107         struct mbuf *m_asconf;
9108         int len;
9109
9110         SCTP_TCB_LOCK_ASSERT(stcb);
9111
9112         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9113             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9114                 /* can't send a new one if there is one in flight already */
9115                 return;
9116         }
9117         /* compose an ASCONF chunk, maximum length is PMTU */
9118         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9119         if (m_asconf == NULL) {
9120                 return;
9121         }
9122         sctp_alloc_a_chunk(stcb, chk);
9123         if (chk == NULL) {
9124                 /* no memory */
9125                 sctp_m_freem(m_asconf);
9126                 return;
9127         }
9128         chk->copy_by_ref = 0;
9129         chk->data = m_asconf;
9130         chk->send_size = len;
9131         chk->rec.chunk_id.id = SCTP_ASCONF;
9132         chk->rec.chunk_id.can_take_data = 0;
9133         chk->sent = SCTP_DATAGRAM_UNSENT;
9134         chk->snd_count = 0;
9135         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9136         chk->asoc = &stcb->asoc;
9137         chk->whoTo = net;
9138         if (chk->whoTo) {
9139                 atomic_add_int(&chk->whoTo->ref_count, 1);
9140         }
9141         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9142         chk->asoc->ctrl_queue_cnt++;
9143         return;
9144 }
9145
9146 void
9147 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9148 {
9149         /*
9150          * formulate and queue a asconf-ack back to sender. the asconf-ack
9151          * must be stored in the tcb.
9152          */
9153         struct sctp_tmit_chunk *chk;
9154         struct sctp_asconf_ack *ack, *latest_ack;
9155         struct mbuf *m_ack;
9156         struct sctp_nets *net = NULL;
9157
9158         SCTP_TCB_LOCK_ASSERT(stcb);
9159         /* Get the latest ASCONF-ACK */
9160         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9161         if (latest_ack == NULL) {
9162                 return;
9163         }
9164         if (latest_ack->last_sent_to != NULL &&
9165             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9166                 /* we're doing a retransmission */
9167                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9168                 if (net == NULL) {
9169                         /* no alternate */
9170                         if (stcb->asoc.last_control_chunk_from == NULL) {
9171                                 if (stcb->asoc.alternate) {
9172                                         net = stcb->asoc.alternate;
9173                                 } else {
9174                                         net = stcb->asoc.primary_destination;
9175                                 }
9176                         } else {
9177                                 net = stcb->asoc.last_control_chunk_from;
9178                         }
9179                 }
9180         } else {
9181                 /* normal case */
9182                 if (stcb->asoc.last_control_chunk_from == NULL) {
9183                         if (stcb->asoc.alternate) {
9184                                 net = stcb->asoc.alternate;
9185                         } else {
9186                                 net = stcb->asoc.primary_destination;
9187                         }
9188                 } else {
9189                         net = stcb->asoc.last_control_chunk_from;
9190                 }
9191         }
9192         latest_ack->last_sent_to = net;
9193
9194         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9195                 if (ack->data == NULL) {
9196                         continue;
9197                 }
9198                 /* copy the asconf_ack */
9199                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9200                 if (m_ack == NULL) {
9201                         /* couldn't copy it */
9202                         return;
9203                 }
9204 #ifdef SCTP_MBUF_LOGGING
9205                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9206                         struct mbuf *mat;
9207
9208                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9209                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9210                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9211                                 }
9212                         }
9213                 }
9214 #endif
9215
9216                 sctp_alloc_a_chunk(stcb, chk);
9217                 if (chk == NULL) {
9218                         /* no memory */
9219                         if (m_ack)
9220                                 sctp_m_freem(m_ack);
9221                         return;
9222                 }
9223                 chk->copy_by_ref = 0;
9224
9225                 chk->whoTo = net;
9226                 if (chk->whoTo) {
9227                         atomic_add_int(&chk->whoTo->ref_count, 1);
9228                 }
9229                 chk->data = m_ack;
9230                 chk->send_size = 0;
9231                 /* Get size */
9232                 chk->send_size = ack->len;
9233                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9234                 chk->rec.chunk_id.can_take_data = 1;
9235                 chk->sent = SCTP_DATAGRAM_UNSENT;
9236                 chk->snd_count = 0;
9237                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9238                 chk->asoc = &stcb->asoc;
9239
9240                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9241                 chk->asoc->ctrl_queue_cnt++;
9242         }
9243         return;
9244 }
9245
9246
9247 static int
9248 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9249     struct sctp_tcb *stcb,
9250     struct sctp_association *asoc,
9251     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9252 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9253     SCTP_UNUSED
9254 #endif
9255 )
9256 {
9257         /*-
9258          * send out one MTU of retransmission. If fast_retransmit is
9259          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9260          * rwnd. For a Cookie or Asconf in the control chunk queue we
9261          * retransmit them by themselves.
9262          *
9263          * For data chunks we will pick out the lowest TSN's in the sent_queue
9264          * marked for resend and bundle them all together (up to a MTU of
9265          * destination). The address to send to should have been
9266          * selected/changed where the retransmission was marked (i.e. in FR
9267          * or t3-timeout routines).
9268          */
9269         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9270         struct sctp_tmit_chunk *chk, *fwd;
9271         struct mbuf *m, *endofchain;
9272         struct sctp_nets *net = NULL;
9273         uint32_t tsns_sent = 0;
9274         int no_fragmentflg, bundle_at, cnt_thru;
9275         unsigned int mtu;
9276         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9277         struct sctp_auth_chunk *auth = NULL;
9278         uint32_t auth_offset = 0;
9279         uint16_t auth_keyid;
9280         int override_ok = 1;
9281         int data_auth_reqd = 0;
9282         uint32_t dmtu = 0;
9283
9284         SCTP_TCB_LOCK_ASSERT(stcb);
9285         tmr_started = ctl_cnt = bundle_at = error = 0;
9286         no_fragmentflg = 1;
9287         fwd_tsn = 0;
9288         *cnt_out = 0;
9289         fwd = NULL;
9290         endofchain = m = NULL;
9291         auth_keyid = stcb->asoc.authinfo.active_keyid;
9292 #ifdef SCTP_AUDITING_ENABLED
9293         sctp_audit_log(0xC3, 1);
9294 #endif
9295         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9296             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9297                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9298                     asoc->sent_queue_retran_cnt);
9299                 asoc->sent_queue_cnt = 0;
9300                 asoc->sent_queue_cnt_removeable = 0;
9301                 /* send back 0/0 so we enter normal transmission */
9302                 *cnt_out = 0;
9303                 return (0);
9304         }
9305         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9306                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9307                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9308                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9309                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9310                                 continue;
9311                         }
9312                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9313                                 if (chk != asoc->str_reset) {
9314                                         /*
9315                                          * not eligible for retran if its
9316                                          * not ours
9317                                          */
9318                                         continue;
9319                                 }
9320                         }
9321                         ctl_cnt++;
9322                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9323                                 fwd_tsn = 1;
9324                         }
9325                         /*
9326                          * Add an AUTH chunk, if chunk requires it save the
9327                          * offset into the chain for AUTH
9328                          */
9329                         if ((auth == NULL) &&
9330                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9331                             stcb->asoc.peer_auth_chunks))) {
9332                                 m = sctp_add_auth_chunk(m, &endofchain,
9333                                     &auth, &auth_offset,
9334                                     stcb,
9335                                     chk->rec.chunk_id.id);
9336                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9337                         }
9338                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9339                         break;
9340                 }
9341         }
9342         one_chunk = 0;
9343         cnt_thru = 0;
9344         /* do we have control chunks to retransmit? */
9345         if (m != NULL) {
9346                 /* Start a timer no matter if we suceed or fail */
9347                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9348                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9349                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9350                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9351                 chk->snd_count++;       /* update our count */
9352                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9353                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9354                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9355                     no_fragmentflg, 0, 0,
9356                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9357                     chk->whoTo->port, NULL,
9358                     0, 0,
9359                     so_locked))) {
9360                         SCTP_STAT_INCR(sctps_lowlevelerr);
9361                         return (error);
9362                 }
9363                 endofchain = NULL;
9364                 auth = NULL;
9365                 auth_offset = 0;
9366                 /*
9367                  * We don't want to mark the net->sent time here since this
9368                  * we use this for HB and retrans cannot measure RTT
9369                  */
9370                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9371                 *cnt_out += 1;
9372                 chk->sent = SCTP_DATAGRAM_SENT;
9373                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9374                 if (fwd_tsn == 0) {
9375                         return (0);
9376                 } else {
9377                         /* Clean up the fwd-tsn list */
9378                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9379                         return (0);
9380                 }
9381         }
9382         /*
9383          * Ok, it is just data retransmission we need to do or that and a
9384          * fwd-tsn with it all.
9385          */
9386         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9387                 return (SCTP_RETRAN_DONE);
9388         }
9389         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9390             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9391                 /* not yet open, resend the cookie and that is it */
9392                 return (1);
9393         }
9394 #ifdef SCTP_AUDITING_ENABLED
9395         sctp_auditing(20, inp, stcb, NULL);
9396 #endif
9397         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9398         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9399                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9400                         /* No, not sent to this net or not ready for rtx */
9401                         continue;
9402                 }
9403                 if (chk->data == NULL) {
9404                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9405                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9406                         continue;
9407                 }
9408                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9409                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9410                         /* Gak, we have exceeded max unlucky retran, abort! */
9411                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9412                             chk->snd_count,
9413                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9414                         atomic_add_int(&stcb->asoc.refcnt, 1);
9415                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9416                         SCTP_TCB_LOCK(stcb);
9417                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9418                         return (SCTP_RETRAN_EXIT);
9419                 }
9420                 /* pick up the net */
9421                 net = chk->whoTo;
9422                 switch (net->ro._l_addr.sa.sa_family) {
9423 #ifdef INET
9424                 case AF_INET:
9425                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9426                         break;
9427 #endif
9428 #ifdef INET6
9429                 case AF_INET6:
9430                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9431                         break;
9432 #endif
9433                 default:
9434                         /* TSNH */
9435                         mtu = net->mtu;
9436                         break;
9437                 }
9438
9439                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9440                         /* No room in peers rwnd */
9441                         uint32_t tsn;
9442
9443                         tsn = asoc->last_acked_seq + 1;
9444                         if (tsn == chk->rec.data.TSN_seq) {
9445                                 /*
9446                                  * we make a special exception for this
9447                                  * case. The peer has no rwnd but is missing
9448                                  * the lowest chunk.. which is probably what
9449                                  * is holding up the rwnd.
9450                                  */
9451                                 goto one_chunk_around;
9452                         }
9453                         return (1);
9454                 }
9455 one_chunk_around:
9456                 if (asoc->peers_rwnd < mtu) {
9457                         one_chunk = 1;
9458                         if ((asoc->peers_rwnd == 0) &&
9459                             (asoc->total_flight == 0)) {
9460                                 chk->window_probe = 1;
9461                                 chk->whoTo->window_probe = 1;
9462                         }
9463                 }
9464 #ifdef SCTP_AUDITING_ENABLED
9465                 sctp_audit_log(0xC3, 2);
9466 #endif
9467                 bundle_at = 0;
9468                 m = NULL;
9469                 net->fast_retran_ip = 0;
9470                 if (chk->rec.data.doing_fast_retransmit == 0) {
9471                         /*
9472                          * if no FR in progress skip destination that have
9473                          * flight_size > cwnd.
9474                          */
9475                         if (net->flight_size >= net->cwnd) {
9476                                 continue;
9477                         }
9478                 } else {
9479                         /*
9480                          * Mark the destination net to have FR recovery
9481                          * limits put on it.
9482                          */
9483                         *fr_done = 1;
9484                         net->fast_retran_ip = 1;
9485                 }
9486
9487                 /*
9488                  * if no AUTH is yet included and this chunk requires it,
9489                  * make sure to account for it.  We don't apply the size
9490                  * until the AUTH chunk is actually added below in case
9491                  * there is no room for this chunk.
9492                  */
9493                 if (data_auth_reqd && (auth == NULL)) {
9494                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9495                 } else
9496                         dmtu = 0;
9497
9498                 if ((chk->send_size <= (mtu - dmtu)) ||
9499                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9500                         /* ok we will add this one */
9501                         if (data_auth_reqd) {
9502                                 if (auth == NULL) {
9503                                         m = sctp_add_auth_chunk(m,
9504                                             &endofchain,
9505                                             &auth,
9506                                             &auth_offset,
9507                                             stcb,
9508                                             SCTP_DATA);
9509                                         auth_keyid = chk->auth_keyid;
9510                                         override_ok = 0;
9511                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9512                                 } else if (override_ok) {
9513                                         auth_keyid = chk->auth_keyid;
9514                                         override_ok = 0;
9515                                 } else if (chk->auth_keyid != auth_keyid) {
9516                                         /* different keyid, so done bundling */
9517                                         break;
9518                                 }
9519                         }
9520                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9521                         if (m == NULL) {
9522                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9523                                 return (ENOMEM);
9524                         }
9525                         /* Do clear IP_DF ? */
9526                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9527                                 no_fragmentflg = 0;
9528                         }
9529                         /* upate our MTU size */
9530                         if (mtu > (chk->send_size + dmtu))
9531                                 mtu -= (chk->send_size + dmtu);
9532                         else
9533                                 mtu = 0;
9534                         data_list[bundle_at++] = chk;
9535                         if (one_chunk && (asoc->total_flight <= 0)) {
9536                                 SCTP_STAT_INCR(sctps_windowprobed);
9537                         }
9538                 }
9539                 if (one_chunk == 0) {
9540                         /*
9541                          * now are there anymore forward from chk to pick
9542                          * up?
9543                          */
9544                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9545                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9546                                         /* Nope, not for retran */
9547                                         continue;
9548                                 }
9549                                 if (fwd->whoTo != net) {
9550                                         /* Nope, not the net in question */
9551                                         continue;
9552                                 }
9553                                 if (data_auth_reqd && (auth == NULL)) {
9554                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9555                                 } else
9556                                         dmtu = 0;
9557                                 if (fwd->send_size <= (mtu - dmtu)) {
9558                                         if (data_auth_reqd) {
9559                                                 if (auth == NULL) {
9560                                                         m = sctp_add_auth_chunk(m,
9561                                                             &endofchain,
9562                                                             &auth,
9563                                                             &auth_offset,
9564                                                             stcb,
9565                                                             SCTP_DATA);
9566                                                         auth_keyid = fwd->auth_keyid;
9567                                                         override_ok = 0;
9568                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9569                                                 } else if (override_ok) {
9570                                                         auth_keyid = fwd->auth_keyid;
9571                                                         override_ok = 0;
9572                                                 } else if (fwd->auth_keyid != auth_keyid) {
9573                                                         /*
9574                                                          * different keyid,
9575                                                          * so done bundling
9576                                                          */
9577                                                         break;
9578                                                 }
9579                                         }
9580                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9581                                         if (m == NULL) {
9582                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9583                                                 return (ENOMEM);
9584                                         }
9585                                         /* Do clear IP_DF ? */
9586                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9587                                                 no_fragmentflg = 0;
9588                                         }
9589                                         /* upate our MTU size */
9590                                         if (mtu > (fwd->send_size + dmtu))
9591                                                 mtu -= (fwd->send_size + dmtu);
9592                                         else
9593                                                 mtu = 0;
9594                                         data_list[bundle_at++] = fwd;
9595                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9596                                                 break;
9597                                         }
9598                                 } else {
9599                                         /* can't fit so we are done */
9600                                         break;
9601                                 }
9602                         }
9603                 }
9604                 /* Is there something to send for this destination? */
9605                 if (m) {
9606                         /*
9607                          * No matter if we fail/or suceed we should start a
9608                          * timer. A failure is like a lost IP packet :-)
9609                          */
9610                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9611                                 /*
9612                                  * no timer running on this destination
9613                                  * restart it.
9614                                  */
9615                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9616                                 tmr_started = 1;
9617                         }
9618                         /* Now lets send it, if there is anything to send :> */
9619                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9620                             (struct sockaddr *)&net->ro._l_addr, m,
9621                             auth_offset, auth, auth_keyid,
9622                             no_fragmentflg, 0, 0,
9623                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9624                             net->port, NULL,
9625                             0, 0,
9626                             so_locked))) {
9627                                 /* error, we could not output */
9628                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9629                                 return (error);
9630                         }
9631                         endofchain = NULL;
9632                         auth = NULL;
9633                         auth_offset = 0;
9634                         /* For HB's */
9635                         /*
9636                          * We don't want to mark the net->sent time here
9637                          * since this we use this for HB and retrans cannot
9638                          * measure RTT
9639                          */
9640                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9641
9642                         /* For auto-close */
9643                         cnt_thru++;
9644                         if (*now_filled == 0) {
9645                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9646                                 *now = asoc->time_last_sent;
9647                                 *now_filled = 1;
9648                         } else {
9649                                 asoc->time_last_sent = *now;
9650                         }
9651                         *cnt_out += bundle_at;
9652 #ifdef SCTP_AUDITING_ENABLED
9653                         sctp_audit_log(0xC4, bundle_at);
9654 #endif
9655                         if (bundle_at) {
9656                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9657                         }
9658                         for (i = 0; i < bundle_at; i++) {
9659                                 SCTP_STAT_INCR(sctps_sendretransdata);
9660                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9661                                 /*
9662                                  * When we have a revoked data, and we
9663                                  * retransmit it, then we clear the revoked
9664                                  * flag since this flag dictates if we
9665                                  * subtracted from the fs
9666                                  */
9667                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9668                                         /* Deflate the cwnd */
9669                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9670                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9671                                 }
9672                                 data_list[i]->snd_count++;
9673                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9674                                 /* record the time */
9675                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9676                                 if (data_list[i]->book_size_scale) {
9677                                         /*
9678                                          * need to double the book size on
9679                                          * this one
9680                                          */
9681                                         data_list[i]->book_size_scale = 0;
9682                                         /*
9683                                          * Since we double the booksize, we
9684                                          * must also double the output queue
9685                                          * size, since this get shrunk when
9686                                          * we free by this amount.
9687                                          */
9688                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9689                                         data_list[i]->book_size *= 2;
9690
9691
9692                                 } else {
9693                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9694                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9695                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9696                                         }
9697                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9698                                             (uint32_t) (data_list[i]->send_size +
9699                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9700                                 }
9701                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9702                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9703                                             data_list[i]->whoTo->flight_size,
9704                                             data_list[i]->book_size,
9705                                             (uintptr_t) data_list[i]->whoTo,
9706                                             data_list[i]->rec.data.TSN_seq);
9707                                 }
9708                                 sctp_flight_size_increase(data_list[i]);
9709                                 sctp_total_flight_increase(stcb, data_list[i]);
9710                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9711                                         /* SWS sender side engages */
9712                                         asoc->peers_rwnd = 0;
9713                                 }
9714                                 if ((i == 0) &&
9715                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9716                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9717                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9718                                             (tmr_started == 0)) {
9719                                                 /*-
9720                                                  * ok we just fast-retrans'd
9721                                                  * the lowest TSN, i.e the
9722                                                  * first on the list. In
9723                                                  * this case we want to give
9724                                                  * some more time to get a
9725                                                  * SACK back without a
9726                                                  * t3-expiring.
9727                                                  */
9728                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9729                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9730                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9731                                         }
9732                                 }
9733                         }
9734                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9735                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9736                         }
9737 #ifdef SCTP_AUDITING_ENABLED
9738                         sctp_auditing(21, inp, stcb, NULL);
9739 #endif
9740                 } else {
9741                         /* None will fit */
9742                         return (1);
9743                 }
9744                 if (asoc->sent_queue_retran_cnt <= 0) {
9745                         /* all done we have no more to retran */
9746                         asoc->sent_queue_retran_cnt = 0;
9747                         break;
9748                 }
9749                 if (one_chunk) {
9750                         /* No more room in rwnd */
9751                         return (1);
9752                 }
9753                 /* stop the for loop here. we sent out a packet */
9754                 break;
9755         }
9756         return (0);
9757 }
9758
9759 static void
9760 sctp_timer_validation(struct sctp_inpcb *inp,
9761     struct sctp_tcb *stcb,
9762     struct sctp_association *asoc)
9763 {
9764         struct sctp_nets *net;
9765
9766         /* Validate that a timer is running somewhere */
9767         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9768                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9769                         /* Here is a timer */
9770                         return;
9771                 }
9772         }
9773         SCTP_TCB_LOCK_ASSERT(stcb);
9774         /* Gak, we did not have a timer somewhere */
9775         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9776         if (asoc->alternate) {
9777                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9778         } else {
9779                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9780         }
9781         return;
9782 }
9783
9784 void
9785 sctp_chunk_output(struct sctp_inpcb *inp,
9786     struct sctp_tcb *stcb,
9787     int from_where,
9788     int so_locked
9789 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9790     SCTP_UNUSED
9791 #endif
9792 )
9793 {
9794         /*-
9795          * Ok this is the generic chunk service queue. we must do the
9796          * following:
9797          * - See if there are retransmits pending, if so we must
9798          *   do these first.
9799          * - Service the stream queue that is next, moving any
9800          *   message (note I must get a complete message i.e.
9801          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9802          *   TSN's
9803          * - Check to see if the cwnd/rwnd allows any output, if so we
9804          *   go ahead and fomulate and send the low level chunks. Making sure
9805          *   to combine any control in the control chunk queue also.
9806          */
9807         struct sctp_association *asoc;
9808         struct sctp_nets *net;
9809         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9810         unsigned int burst_cnt = 0;
9811         struct timeval now;
9812         int now_filled = 0;
9813         int nagle_on;
9814         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9815         int un_sent = 0;
9816         int fr_done;
9817         unsigned int tot_frs = 0;
9818
9819         asoc = &stcb->asoc;
9820         /* The Nagle algorithm is only applied when handling a send call. */
9821         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9822                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9823                         nagle_on = 0;
9824                 } else {
9825                         nagle_on = 1;
9826                 }
9827         } else {
9828                 nagle_on = 0;
9829         }
9830         SCTP_TCB_LOCK_ASSERT(stcb);
9831
9832         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9833
9834         if ((un_sent <= 0) &&
9835             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9836             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9837             (asoc->sent_queue_retran_cnt == 0)) {
9838                 /* Nothing to do unless there is something to be sent left */
9839                 return;
9840         }
9841         /*
9842          * Do we have something to send, data or control AND a sack timer
9843          * running, if so piggy-back the sack.
9844          */
9845         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9846                 sctp_send_sack(stcb, so_locked);
9847                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9848         }
9849         while (asoc->sent_queue_retran_cnt) {
9850                 /*-
9851                  * Ok, it is retransmission time only, we send out only ONE
9852                  * packet with a single call off to the retran code.
9853                  */
9854                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9855                         /*-
9856                          * Special hook for handling cookiess discarded
9857                          * by peer that carried data. Send cookie-ack only
9858                          * and then the next call with get the retran's.
9859                          */
9860                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9861                             from_where,
9862                             &now, &now_filled, frag_point, so_locked);
9863                         return;
9864                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9865                         /* if its not from a HB then do it */
9866                         fr_done = 0;
9867                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9868                         if (fr_done) {
9869                                 tot_frs++;
9870                         }
9871                 } else {
9872                         /*
9873                          * its from any other place, we don't allow retran
9874                          * output (only control)
9875                          */
9876                         ret = 1;
9877                 }
9878                 if (ret > 0) {
9879                         /* Can't send anymore */
9880                         /*-
9881                          * now lets push out control by calling med-level
9882                          * output once. this assures that we WILL send HB's
9883                          * if queued too.
9884                          */
9885                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9886                             from_where,
9887                             &now, &now_filled, frag_point, so_locked);
9888 #ifdef SCTP_AUDITING_ENABLED
9889                         sctp_auditing(8, inp, stcb, NULL);
9890 #endif
9891                         sctp_timer_validation(inp, stcb, asoc);
9892                         return;
9893                 }
9894                 if (ret < 0) {
9895                         /*-
9896                          * The count was off.. retran is not happening so do
9897                          * the normal retransmission.
9898                          */
9899 #ifdef SCTP_AUDITING_ENABLED
9900                         sctp_auditing(9, inp, stcb, NULL);
9901 #endif
9902                         if (ret == SCTP_RETRAN_EXIT) {
9903                                 return;
9904                         }
9905                         break;
9906                 }
9907                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9908                         /* Only one transmission allowed out of a timeout */
9909 #ifdef SCTP_AUDITING_ENABLED
9910                         sctp_auditing(10, inp, stcb, NULL);
9911 #endif
9912                         /* Push out any control */
9913                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9914                             &now, &now_filled, frag_point, so_locked);
9915                         return;
9916                 }
9917                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9918                         /* Hit FR burst limit */
9919                         return;
9920                 }
9921                 if ((num_out == 0) && (ret == 0)) {
9922                         /* No more retrans to send */
9923                         break;
9924                 }
9925         }
9926 #ifdef SCTP_AUDITING_ENABLED
9927         sctp_auditing(12, inp, stcb, NULL);
9928 #endif
9929         /* Check for bad destinations, if they exist move chunks around. */
9930         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9931                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9932                         /*-
9933                          * if possible move things off of this address we
9934                          * still may send below due to the dormant state but
9935                          * we try to find an alternate address to send to
9936                          * and if we have one we move all queued data on the
9937                          * out wheel to this alternate address.
9938                          */
9939                         if (net->ref_count > 1)
9940                                 sctp_move_chunks_from_net(stcb, net);
9941                 } else {
9942                         /*-
9943                          * if ((asoc->sat_network) || (net->addr_is_local))
9944                          * { burst_limit = asoc->max_burst *
9945                          * SCTP_SAT_NETWORK_BURST_INCR; }
9946                          */
9947                         if (asoc->max_burst > 0) {
9948                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9949                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9950                                                 /*
9951                                                  * JRS - Use the congestion
9952                                                  * control given in the
9953                                                  * congestion control module
9954                                                  */
9955                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9956                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9957                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9958                                                 }
9959                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9960                                         }
9961                                         net->fast_retran_ip = 0;
9962                                 } else {
9963                                         if (net->flight_size == 0) {
9964                                                 /*
9965                                                  * Should be decaying the
9966                                                  * cwnd here
9967                                                  */
9968                                                 ;
9969                                         }
9970                                 }
9971                         }
9972                 }
9973
9974         }
9975         burst_cnt = 0;
9976         do {
9977                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9978                     &reason_code, 0, from_where,
9979                     &now, &now_filled, frag_point, so_locked);
9980                 if (error) {
9981                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9982                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9983                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9984                         }
9985                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9986                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9987                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9988                         }
9989                         break;
9990                 }
9991                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9992
9993                 tot_out += num_out;
9994                 burst_cnt++;
9995                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9996                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9997                         if (num_out == 0) {
9998                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9999                         }
10000                 }
10001                 if (nagle_on) {
10002                         /*
10003                          * When the Nagle algorithm is used, look at how
10004                          * much is unsent, then if its smaller than an MTU
10005                          * and we have data in flight we stop, except if we
10006                          * are handling a fragmented user message.
10007                          */
10008                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10009                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10010                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10011                             (stcb->asoc.total_flight > 0) &&
10012                             ((stcb->asoc.locked_on_sending == NULL) ||
10013                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10014                                 break;
10015                         }
10016                 }
10017                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10018                     TAILQ_EMPTY(&asoc->send_queue) &&
10019                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10020                         /* Nothing left to send */
10021                         break;
10022                 }
10023                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10024                         /* Nothing left to send */
10025                         break;
10026                 }
10027         } while (num_out &&
10028             ((asoc->max_burst == 0) ||
10029             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10030             (burst_cnt < asoc->max_burst)));
10031
10032         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10033                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10034                         SCTP_STAT_INCR(sctps_maxburstqueued);
10035                         asoc->burst_limit_applied = 1;
10036                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10037                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10038                         }
10039                 } else {
10040                         asoc->burst_limit_applied = 0;
10041                 }
10042         }
10043         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10044                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10045         }
10046         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10047             tot_out);
10048
10049         /*-
10050          * Now we need to clean up the control chunk chain if a ECNE is on
10051          * it. It must be marked as UNSENT again so next call will continue
10052          * to send it until such time that we get a CWR, to remove it.
10053          */
10054         if (stcb->asoc.ecn_echo_cnt_onq)
10055                 sctp_fix_ecn_echo(asoc);
10056         return;
10057 }
10058
10059
10060 int
10061 sctp_output(
10062     struct sctp_inpcb *inp,
10063     struct mbuf *m,
10064     struct sockaddr *addr,
10065     struct mbuf *control,
10066     struct thread *p,
10067     int flags)
10068 {
10069         if (inp == NULL) {
10070                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10071                 return (EINVAL);
10072         }
10073         if (inp->sctp_socket == NULL) {
10074                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10075                 return (EINVAL);
10076         }
10077         return (sctp_sosend(inp->sctp_socket,
10078             addr,
10079             (struct uio *)NULL,
10080             m,
10081             control,
10082             flags, p
10083             ));
10084 }
10085
10086 void
10087 send_forward_tsn(struct sctp_tcb *stcb,
10088     struct sctp_association *asoc)
10089 {
10090         struct sctp_tmit_chunk *chk;
10091         struct sctp_forward_tsn_chunk *fwdtsn;
10092         uint32_t advance_peer_ack_point;
10093
10094         SCTP_TCB_LOCK_ASSERT(stcb);
10095         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10096                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10097                         /* mark it to unsent */
10098                         chk->sent = SCTP_DATAGRAM_UNSENT;
10099                         chk->snd_count = 0;
10100                         /* Do we correct its output location? */
10101                         if (chk->whoTo) {
10102                                 sctp_free_remote_addr(chk->whoTo);
10103                                 chk->whoTo = NULL;
10104                         }
10105                         goto sctp_fill_in_rest;
10106                 }
10107         }
10108         /* Ok if we reach here we must build one */
10109         sctp_alloc_a_chunk(stcb, chk);
10110         if (chk == NULL) {
10111                 return;
10112         }
10113         asoc->fwd_tsn_cnt++;
10114         chk->copy_by_ref = 0;
10115         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10116         chk->rec.chunk_id.can_take_data = 0;
10117         chk->asoc = asoc;
10118         chk->whoTo = NULL;
10119         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10120         if (chk->data == NULL) {
10121                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10122                 return;
10123         }
10124         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10125         chk->sent = SCTP_DATAGRAM_UNSENT;
10126         chk->snd_count = 0;
10127         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10128         asoc->ctrl_queue_cnt++;
10129 sctp_fill_in_rest:
10130         /*-
10131          * Here we go through and fill out the part that deals with
10132          * stream/seq of the ones we skip.
10133          */
10134         SCTP_BUF_LEN(chk->data) = 0;
10135         {
10136                 struct sctp_tmit_chunk *at, *tp1, *last;
10137                 struct sctp_strseq *strseq;
10138                 unsigned int cnt_of_space, i, ovh;
10139                 unsigned int space_needed;
10140                 unsigned int cnt_of_skipped = 0;
10141
10142                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10143                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10144                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10145                                 /* no more to look at */
10146                                 break;
10147                         }
10148                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10149                                 /* We don't report these */
10150                                 continue;
10151                         }
10152                         cnt_of_skipped++;
10153                 }
10154                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10155                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10156
10157                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10158
10159                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10160                         ovh = SCTP_MIN_OVERHEAD;
10161                 } else {
10162                         ovh = SCTP_MIN_V4_OVERHEAD;
10163                 }
10164                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10165                         /* trim to a mtu size */
10166                         cnt_of_space = asoc->smallest_mtu - ovh;
10167                 }
10168                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10169                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10170                             0xff, 0, cnt_of_skipped,
10171                             asoc->advanced_peer_ack_point);
10172
10173                 }
10174                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10175                 if (cnt_of_space < space_needed) {
10176                         /*-
10177                          * ok we must trim down the chunk by lowering the
10178                          * advance peer ack point.
10179                          */
10180                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10181                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10182                                     0xff, 0xff, cnt_of_space,
10183                                     space_needed);
10184                         }
10185                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10186                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10187                         /*-
10188                          * Go through and find the TSN that will be the one
10189                          * we report.
10190                          */
10191                         at = TAILQ_FIRST(&asoc->sent_queue);
10192                         if (at != NULL) {
10193                                 for (i = 0; i < cnt_of_skipped; i++) {
10194                                         tp1 = TAILQ_NEXT(at, sctp_next);
10195                                         if (tp1 == NULL) {
10196                                                 break;
10197                                         }
10198                                         at = tp1;
10199                                 }
10200                         }
10201                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10202                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10203                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10204                                     asoc->advanced_peer_ack_point);
10205                         }
10206                         last = at;
10207                         /*-
10208                          * last now points to last one I can report, update
10209                          * peer ack point
10210                          */
10211                         if (last)
10212                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10213                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10214                             cnt_of_skipped * sizeof(struct sctp_strseq);
10215                 }
10216                 chk->send_size = space_needed;
10217                 /* Setup the chunk */
10218                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10219                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10220                 fwdtsn->ch.chunk_flags = 0;
10221                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10222                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10223                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10224                 fwdtsn++;
10225                 /*-
10226                  * Move pointer to after the fwdtsn and transfer to the
10227                  * strseq pointer.
10228                  */
10229                 strseq = (struct sctp_strseq *)fwdtsn;
10230                 /*-
10231                  * Now populate the strseq list. This is done blindly
10232                  * without pulling out duplicate stream info. This is
10233                  * inefficent but won't harm the process since the peer will
10234                  * look at these in sequence and will thus release anything.
10235                  * It could mean we exceed the PMTU and chop off some that
10236                  * we could have included.. but this is unlikely (aka 1432/4
10237                  * would mean 300+ stream seq's would have to be reported in
10238                  * one FWD-TSN. With a bit of work we can later FIX this to
10239                  * optimize and pull out duplcates.. but it does add more
10240                  * overhead. So for now... not!
10241                  */
10242                 at = TAILQ_FIRST(&asoc->sent_queue);
10243                 for (i = 0; i < cnt_of_skipped; i++) {
10244                         tp1 = TAILQ_NEXT(at, sctp_next);
10245                         if (tp1 == NULL)
10246                                 break;
10247                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10248                                 /* We don't report these */
10249                                 i--;
10250                                 at = tp1;
10251                                 continue;
10252                         }
10253                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10254                                 at->rec.data.fwd_tsn_cnt = 0;
10255                         }
10256                         strseq->stream = ntohs(at->rec.data.stream_number);
10257                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10258                         strseq++;
10259                         at = tp1;
10260                 }
10261         }
10262         return;
10263 }
10264
10265 void
10266 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10267 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10268     SCTP_UNUSED
10269 #endif
10270 )
10271 {
10272         /*-
10273          * Queue up a SACK or NR-SACK in the control queue.
10274          * We must first check to see if a SACK or NR-SACK is
10275          * somehow on the control queue.
10276          * If so, we will take and and remove the old one.
10277          */
10278         struct sctp_association *asoc;
10279         struct sctp_tmit_chunk *chk, *a_chk;
10280         struct sctp_sack_chunk *sack;
10281         struct sctp_nr_sack_chunk *nr_sack;
10282         struct sctp_gap_ack_block *gap_descriptor;
10283         struct sack_track *selector;
10284         int mergeable = 0;
10285         int offset;
10286         caddr_t limit;
10287         uint32_t *dup;
10288         int limit_reached = 0;
10289         unsigned int i, siz, j;
10290         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10291         int num_dups = 0;
10292         int space_req;
10293         uint32_t highest_tsn;
10294         uint8_t flags;
10295         uint8_t type;
10296         uint8_t tsn_map;
10297
10298         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10299             (stcb->asoc.peer_supports_nr_sack == 1)) {
10300                 type = SCTP_NR_SELECTIVE_ACK;
10301         } else {
10302                 type = SCTP_SELECTIVE_ACK;
10303         }
10304         a_chk = NULL;
10305         asoc = &stcb->asoc;
10306         SCTP_TCB_LOCK_ASSERT(stcb);
10307         if (asoc->last_data_chunk_from == NULL) {
10308                 /* Hmm we never received anything */
10309                 return;
10310         }
10311         sctp_slide_mapping_arrays(stcb);
10312         sctp_set_rwnd(stcb, asoc);
10313         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10314                 if (chk->rec.chunk_id.id == type) {
10315                         /* Hmm, found a sack already on queue, remove it */
10316                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10317                         asoc->ctrl_queue_cnt--;
10318                         a_chk = chk;
10319                         if (a_chk->data) {
10320                                 sctp_m_freem(a_chk->data);
10321                                 a_chk->data = NULL;
10322                         }
10323                         if (a_chk->whoTo) {
10324                                 sctp_free_remote_addr(a_chk->whoTo);
10325                                 a_chk->whoTo = NULL;
10326                         }
10327                         break;
10328                 }
10329         }
10330         if (a_chk == NULL) {
10331                 sctp_alloc_a_chunk(stcb, a_chk);
10332                 if (a_chk == NULL) {
10333                         /* No memory so we drop the idea, and set a timer */
10334                         if (stcb->asoc.delayed_ack) {
10335                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10336                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10337                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10338                                     stcb->sctp_ep, stcb, NULL);
10339                         } else {
10340                                 stcb->asoc.send_sack = 1;
10341                         }
10342                         return;
10343                 }
10344                 a_chk->copy_by_ref = 0;
10345                 a_chk->rec.chunk_id.id = type;
10346                 a_chk->rec.chunk_id.can_take_data = 1;
10347         }
10348         /* Clear our pkt counts */
10349         asoc->data_pkts_seen = 0;
10350
10351         a_chk->asoc = asoc;
10352         a_chk->snd_count = 0;
10353         a_chk->send_size = 0;   /* fill in later */
10354         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10355         a_chk->whoTo = NULL;
10356
10357         if ((asoc->numduptsns) ||
10358             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10359                 /*-
10360                  * Ok, we have some duplicates or the destination for the
10361                  * sack is unreachable, lets see if we can select an
10362                  * alternate than asoc->last_data_chunk_from
10363                  */
10364                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10365                     (asoc->used_alt_onsack > asoc->numnets)) {
10366                         /* We used an alt last time, don't this time */
10367                         a_chk->whoTo = NULL;
10368                 } else {
10369                         asoc->used_alt_onsack++;
10370                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10371                 }
10372                 if (a_chk->whoTo == NULL) {
10373                         /* Nope, no alternate */
10374                         a_chk->whoTo = asoc->last_data_chunk_from;
10375                         asoc->used_alt_onsack = 0;
10376                 }
10377         } else {
10378                 /*
10379                  * No duplicates so we use the last place we received data
10380                  * from.
10381                  */
10382                 asoc->used_alt_onsack = 0;
10383                 a_chk->whoTo = asoc->last_data_chunk_from;
10384         }
10385         if (a_chk->whoTo) {
10386                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10387         }
10388         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10389                 highest_tsn = asoc->highest_tsn_inside_map;
10390         } else {
10391                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10392         }
10393         if (highest_tsn == asoc->cumulative_tsn) {
10394                 /* no gaps */
10395                 if (type == SCTP_SELECTIVE_ACK) {
10396                         space_req = sizeof(struct sctp_sack_chunk);
10397                 } else {
10398                         space_req = sizeof(struct sctp_nr_sack_chunk);
10399                 }
10400         } else {
10401                 /* gaps get a cluster */
10402                 space_req = MCLBYTES;
10403         }
10404         /* Ok now lets formulate a MBUF with our sack */
10405         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10406         if ((a_chk->data == NULL) ||
10407             (a_chk->whoTo == NULL)) {
10408                 /* rats, no mbuf memory */
10409                 if (a_chk->data) {
10410                         /* was a problem with the destination */
10411                         sctp_m_freem(a_chk->data);
10412                         a_chk->data = NULL;
10413                 }
10414                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10415                 /* sa_ignore NO_NULL_CHK */
10416                 if (stcb->asoc.delayed_ack) {
10417                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10418                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10419                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10420                             stcb->sctp_ep, stcb, NULL);
10421                 } else {
10422                         stcb->asoc.send_sack = 1;
10423                 }
10424                 return;
10425         }
10426         /* ok, lets go through and fill it in */
10427         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10428         space = M_TRAILINGSPACE(a_chk->data);
10429         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10430                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10431         }
10432         limit = mtod(a_chk->data, caddr_t);
10433         limit += space;
10434
10435         flags = 0;
10436
10437         if ((asoc->sctp_cmt_on_off > 0) &&
10438             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10439                 /*-
10440                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10441                  * received, then set high bit to 1, else 0. Reset
10442                  * pkts_rcvd.
10443                  */
10444                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10445                 asoc->cmt_dac_pkts_rcvd = 0;
10446         }
10447 #ifdef SCTP_ASOCLOG_OF_TSNS
10448         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10449         stcb->asoc.cumack_log_atsnt++;
10450         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10451                 stcb->asoc.cumack_log_atsnt = 0;
10452         }
10453 #endif
10454         /* reset the readers interpretation */
10455         stcb->freed_by_sorcv_sincelast = 0;
10456
10457         if (type == SCTP_SELECTIVE_ACK) {
10458                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10459                 nr_sack = NULL;
10460                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10461                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10462                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10463                 } else {
10464                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10465                 }
10466         } else {
10467                 sack = NULL;
10468                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10469                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10470                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10471                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10472                 } else {
10473                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10474                 }
10475         }
10476
10477         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10478                 offset = 1;
10479         } else {
10480                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10481         }
10482         if (((type == SCTP_SELECTIVE_ACK) &&
10483             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10484             ((type == SCTP_NR_SELECTIVE_ACK) &&
10485             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10486                 /* we have a gap .. maybe */
10487                 for (i = 0; i < siz; i++) {
10488                         tsn_map = asoc->mapping_array[i];
10489                         if (type == SCTP_SELECTIVE_ACK) {
10490                                 tsn_map |= asoc->nr_mapping_array[i];
10491                         }
10492                         if (i == 0) {
10493                                 /*
10494                                  * Clear all bits corresponding to TSNs
10495                                  * smaller or equal to the cumulative TSN.
10496                                  */
10497                                 tsn_map &= (~0 << (1 - offset));
10498                         }
10499                         selector = &sack_array[tsn_map];
10500                         if (mergeable && selector->right_edge) {
10501                                 /*
10502                                  * Backup, left and right edges were ok to
10503                                  * merge.
10504                                  */
10505                                 num_gap_blocks--;
10506                                 gap_descriptor--;
10507                         }
10508                         if (selector->num_entries == 0)
10509                                 mergeable = 0;
10510                         else {
10511                                 for (j = 0; j < selector->num_entries; j++) {
10512                                         if (mergeable && selector->right_edge) {
10513                                                 /*
10514                                                  * do a merge by NOT setting
10515                                                  * the left side
10516                                                  */
10517                                                 mergeable = 0;
10518                                         } else {
10519                                                 /*
10520                                                  * no merge, set the left
10521                                                  * side
10522                                                  */
10523                                                 mergeable = 0;
10524                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10525                                         }
10526                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10527                                         num_gap_blocks++;
10528                                         gap_descriptor++;
10529                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10530                                                 /* no more room */
10531                                                 limit_reached = 1;
10532                                                 break;
10533                                         }
10534                                 }
10535                                 if (selector->left_edge) {
10536                                         mergeable = 1;
10537                                 }
10538                         }
10539                         if (limit_reached) {
10540                                 /* Reached the limit stop */
10541                                 break;
10542                         }
10543                         offset += 8;
10544                 }
10545         }
10546         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10547             (limit_reached == 0)) {
10548
10549                 mergeable = 0;
10550
10551                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10552                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10553                 } else {
10554                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10555                 }
10556
10557                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10558                         offset = 1;
10559                 } else {
10560                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10561                 }
10562                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10563                         /* we have a gap .. maybe */
10564                         for (i = 0; i < siz; i++) {
10565                                 tsn_map = asoc->nr_mapping_array[i];
10566                                 if (i == 0) {
10567                                         /*
10568                                          * Clear all bits corresponding to
10569                                          * TSNs smaller or equal to the
10570                                          * cumulative TSN.
10571                                          */
10572                                         tsn_map &= (~0 << (1 - offset));
10573                                 }
10574                                 selector = &sack_array[tsn_map];
10575                                 if (mergeable && selector->right_edge) {
10576                                         /*
10577                                          * Backup, left and right edges were
10578                                          * ok to merge.
10579                                          */
10580                                         num_nr_gap_blocks--;
10581                                         gap_descriptor--;
10582                                 }
10583                                 if (selector->num_entries == 0)
10584                                         mergeable = 0;
10585                                 else {
10586                                         for (j = 0; j < selector->num_entries; j++) {
10587                                                 if (mergeable && selector->right_edge) {
10588                                                         /*
10589                                                          * do a merge by NOT
10590                                                          * setting the left
10591                                                          * side
10592                                                          */
10593                                                         mergeable = 0;
10594                                                 } else {
10595                                                         /*
10596                                                          * no merge, set the
10597                                                          * left side
10598                                                          */
10599                                                         mergeable = 0;
10600                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10601                                                 }
10602                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10603                                                 num_nr_gap_blocks++;
10604                                                 gap_descriptor++;
10605                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10606                                                         /* no more room */
10607                                                         limit_reached = 1;
10608                                                         break;
10609                                                 }
10610                                         }
10611                                         if (selector->left_edge) {
10612                                                 mergeable = 1;
10613                                         }
10614                                 }
10615                                 if (limit_reached) {
10616                                         /* Reached the limit stop */
10617                                         break;
10618                                 }
10619                                 offset += 8;
10620                         }
10621                 }
10622         }
10623         /* now we must add any dups we are going to report. */
10624         if ((limit_reached == 0) && (asoc->numduptsns)) {
10625                 dup = (uint32_t *) gap_descriptor;
10626                 for (i = 0; i < asoc->numduptsns; i++) {
10627                         *dup = htonl(asoc->dup_tsns[i]);
10628                         dup++;
10629                         num_dups++;
10630                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10631                                 /* no more room */
10632                                 break;
10633                         }
10634                 }
10635                 asoc->numduptsns = 0;
10636         }
10637         /*
10638          * now that the chunk is prepared queue it to the control chunk
10639          * queue.
10640          */
10641         if (type == SCTP_SELECTIVE_ACK) {
10642                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10643                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10644                     num_dups * sizeof(int32_t);
10645                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10646                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10647                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10648                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10649                 sack->sack.num_dup_tsns = htons(num_dups);
10650                 sack->ch.chunk_type = type;
10651                 sack->ch.chunk_flags = flags;
10652                 sack->ch.chunk_length = htons(a_chk->send_size);
10653         } else {
10654                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10655                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10656                     num_dups * sizeof(int32_t);
10657                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10658                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10659                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10660                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10661                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10662                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10663                 nr_sack->nr_sack.reserved = 0;
10664                 nr_sack->ch.chunk_type = type;
10665                 nr_sack->ch.chunk_flags = flags;
10666                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10667         }
10668         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10669         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10670         asoc->ctrl_queue_cnt++;
10671         asoc->send_sack = 0;
10672         SCTP_STAT_INCR(sctps_sendsacks);
10673         return;
10674 }
10675
10676 void
10677 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10678 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10679     SCTP_UNUSED
10680 #endif
10681 )
10682 {
10683         struct mbuf *m_abort, *m, *m_last;
10684         struct mbuf *m_out, *m_end = NULL;
10685         struct sctp_abort_chunk *abort;
10686         struct sctp_auth_chunk *auth = NULL;
10687         struct sctp_nets *net;
10688         uint32_t vtag;
10689         uint32_t auth_offset = 0;
10690         uint16_t cause_len, chunk_len, padding_len;
10691
10692         SCTP_TCB_LOCK_ASSERT(stcb);
10693         /*-
10694          * Add an AUTH chunk, if chunk requires it and save the offset into
10695          * the chain for AUTH
10696          */
10697         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10698             stcb->asoc.peer_auth_chunks)) {
10699                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10700                     stcb, SCTP_ABORT_ASSOCIATION);
10701                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10702         } else {
10703                 m_out = NULL;
10704         }
10705         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10706         if (m_abort == NULL) {
10707                 if (m_out) {
10708                         sctp_m_freem(m_out);
10709                 }
10710                 if (operr) {
10711                         sctp_m_freem(operr);
10712                 }
10713                 return;
10714         }
10715         /* link in any error */
10716         SCTP_BUF_NEXT(m_abort) = operr;
10717         cause_len = 0;
10718         m_last = NULL;
10719         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10720                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10721                 if (SCTP_BUF_NEXT(m) == NULL) {
10722                         m_last = m;
10723                 }
10724         }
10725         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10726         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10727         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10728         if (m_out == NULL) {
10729                 /* NO Auth chunk prepended, so reserve space in front */
10730                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10731                 m_out = m_abort;
10732         } else {
10733                 /* Put AUTH chunk at the front of the chain */
10734                 SCTP_BUF_NEXT(m_end) = m_abort;
10735         }
10736         if (stcb->asoc.alternate) {
10737                 net = stcb->asoc.alternate;
10738         } else {
10739                 net = stcb->asoc.primary_destination;
10740         }
10741         /* Fill in the ABORT chunk header. */
10742         abort = mtod(m_abort, struct sctp_abort_chunk *);
10743         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10744         if (stcb->asoc.peer_vtag == 0) {
10745                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10746                 vtag = stcb->asoc.my_vtag;
10747                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10748         } else {
10749                 vtag = stcb->asoc.peer_vtag;
10750                 abort->ch.chunk_flags = 0;
10751         }
10752         abort->ch.chunk_length = htons(chunk_len);
10753         /* Add padding, if necessary. */
10754         if (padding_len > 0) {
10755                 if ((m_last == NULL) || sctp_add_pad_tombuf(m_last, padding_len)) {
10756                         sctp_m_freem(m_out);
10757                         return;
10758                 }
10759         }
10760         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10761             (struct sockaddr *)&net->ro._l_addr,
10762             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10763             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10764             stcb->asoc.primary_destination->port, NULL,
10765             0, 0,
10766             so_locked);
10767         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10768 }
10769
10770 void
10771 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10772     struct sctp_nets *net,
10773     int reflect_vtag)
10774 {
10775         /* formulate and SEND a SHUTDOWN-COMPLETE */
10776         struct mbuf *m_shutdown_comp;
10777         struct sctp_shutdown_complete_chunk *shutdown_complete;
10778         uint32_t vtag;
10779         uint8_t flags;
10780
10781         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10782         if (m_shutdown_comp == NULL) {
10783                 /* no mbuf's */
10784                 return;
10785         }
10786         if (reflect_vtag) {
10787                 flags = SCTP_HAD_NO_TCB;
10788                 vtag = stcb->asoc.my_vtag;
10789         } else {
10790                 flags = 0;
10791                 vtag = stcb->asoc.peer_vtag;
10792         }
10793         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10794         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10795         shutdown_complete->ch.chunk_flags = flags;
10796         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10797         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10798         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10799             (struct sockaddr *)&net->ro._l_addr,
10800             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10801             stcb->sctp_ep->sctp_lport, stcb->rport,
10802             htonl(vtag),
10803             net->port, NULL,
10804             0, 0,
10805             SCTP_SO_NOT_LOCKED);
10806         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10807         return;
10808 }
10809
10810 static void
10811 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10812     struct sctphdr *sh, uint32_t vtag,
10813     uint8_t type, struct mbuf *cause,
10814     uint8_t use_mflowid, uint32_t mflowid,
10815     uint32_t vrf_id, uint16_t port)
10816 {
10817         struct mbuf *o_pak;
10818         struct mbuf *mout;
10819         struct sctphdr *shout;
10820         struct sctp_chunkhdr *ch;
10821         struct udphdr *udp;
10822         int len, cause_len, padding_len;
10823
10824 #if defined(INET) || defined(INET6)
10825         int ret;
10826
10827 #endif
10828 #ifdef INET
10829         struct sockaddr_in *src_sin, *dst_sin;
10830         struct ip *ip;
10831
10832 #endif
10833 #ifdef INET6
10834         struct sockaddr_in6 *src_sin6, *dst_sin6;
10835         struct ip6_hdr *ip6;
10836
10837 #endif
10838
10839         /* Compute the length of the cause and add final padding. */
10840         cause_len = 0;
10841         if (cause != NULL) {
10842                 struct mbuf *m_at, *m_last = NULL;
10843
10844                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10845                         if (SCTP_BUF_NEXT(m_at) == NULL)
10846                                 m_last = m_at;
10847                         cause_len += SCTP_BUF_LEN(m_at);
10848                 }
10849                 padding_len = cause_len % 4;
10850                 if (padding_len != 0) {
10851                         padding_len = 4 - padding_len;
10852                 }
10853                 if (padding_len != 0) {
10854                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10855                                 sctp_m_freem(cause);
10856                                 return;
10857                         }
10858                 }
10859         } else {
10860                 padding_len = 0;
10861         }
10862         /* Get an mbuf for the header. */
10863         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10864         switch (dst->sa_family) {
10865 #ifdef INET
10866         case AF_INET:
10867                 len += sizeof(struct ip);
10868                 break;
10869 #endif
10870 #ifdef INET6
10871         case AF_INET6:
10872                 len += sizeof(struct ip6_hdr);
10873                 break;
10874 #endif
10875         default:
10876                 break;
10877         }
10878         if (port) {
10879                 len += sizeof(struct udphdr);
10880         }
10881         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
10882         if (mout == NULL) {
10883                 if (cause) {
10884                         sctp_m_freem(cause);
10885                 }
10886                 return;
10887         }
10888         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10889         SCTP_BUF_LEN(mout) = len;
10890         SCTP_BUF_NEXT(mout) = cause;
10891         if (use_mflowid != 0) {
10892                 mout->m_pkthdr.flowid = mflowid;
10893                 mout->m_flags |= M_FLOWID;
10894         }
10895 #ifdef INET
10896         ip = NULL;
10897 #endif
10898 #ifdef INET6
10899         ip6 = NULL;
10900 #endif
10901         switch (dst->sa_family) {
10902 #ifdef INET
10903         case AF_INET:
10904                 src_sin = (struct sockaddr_in *)src;
10905                 dst_sin = (struct sockaddr_in *)dst;
10906                 ip = mtod(mout, struct ip *);
10907                 ip->ip_v = IPVERSION;
10908                 ip->ip_hl = (sizeof(struct ip) >> 2);
10909                 ip->ip_tos = 0;
10910                 ip->ip_id = ip_newid();
10911                 ip->ip_off = 0;
10912                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10913                 if (port) {
10914                         ip->ip_p = IPPROTO_UDP;
10915                 } else {
10916                         ip->ip_p = IPPROTO_SCTP;
10917                 }
10918                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10919                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10920                 ip->ip_sum = 0;
10921                 len = sizeof(struct ip);
10922                 shout = (struct sctphdr *)((caddr_t)ip + len);
10923                 break;
10924 #endif
10925 #ifdef INET6
10926         case AF_INET6:
10927                 src_sin6 = (struct sockaddr_in6 *)src;
10928                 dst_sin6 = (struct sockaddr_in6 *)dst;
10929                 ip6 = mtod(mout, struct ip6_hdr *);
10930                 ip6->ip6_flow = htonl(0x60000000);
10931                 if (V_ip6_auto_flowlabel) {
10932                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10933                 }
10934                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10935                 if (port) {
10936                         ip6->ip6_nxt = IPPROTO_UDP;
10937                 } else {
10938                         ip6->ip6_nxt = IPPROTO_SCTP;
10939                 }
10940                 ip6->ip6_src = dst_sin6->sin6_addr;
10941                 ip6->ip6_dst = src_sin6->sin6_addr;
10942                 len = sizeof(struct ip6_hdr);
10943                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10944                 break;
10945 #endif
10946         default:
10947                 len = 0;
10948                 shout = mtod(mout, struct sctphdr *);
10949                 break;
10950         }
10951         if (port) {
10952                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10953                         sctp_m_freem(mout);
10954                         return;
10955                 }
10956                 udp = (struct udphdr *)shout;
10957                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10958                 udp->uh_dport = port;
10959                 udp->uh_sum = 0;
10960                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10961                     sizeof(struct sctphdr) +
10962                     sizeof(struct sctp_chunkhdr) +
10963                     cause_len + padding_len);
10964                 len += sizeof(struct udphdr);
10965                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10966         } else {
10967                 udp = NULL;
10968         }
10969         shout->src_port = sh->dest_port;
10970         shout->dest_port = sh->src_port;
10971         shout->checksum = 0;
10972         if (vtag) {
10973                 shout->v_tag = htonl(vtag);
10974         } else {
10975                 shout->v_tag = sh->v_tag;
10976         }
10977         len += sizeof(struct sctphdr);
10978         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10979         ch->chunk_type = type;
10980         if (vtag) {
10981                 ch->chunk_flags = 0;
10982         } else {
10983                 ch->chunk_flags = SCTP_HAD_NO_TCB;
10984         }
10985         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10986         len += sizeof(struct sctp_chunkhdr);
10987         len += cause_len + padding_len;
10988
10989         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10990                 sctp_m_freem(mout);
10991                 return;
10992         }
10993         SCTP_ATTACH_CHAIN(o_pak, mout, len);
10994         switch (dst->sa_family) {
10995 #ifdef INET
10996         case AF_INET:
10997                 if (port) {
10998                         if (V_udp_cksum) {
10999                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11000                         } else {
11001                                 udp->uh_sum = 0;
11002                         }
11003                 }
11004                 ip->ip_len = htons(len);
11005                 if (port) {
11006 #if defined(SCTP_WITH_NO_CSUM)
11007                         SCTP_STAT_INCR(sctps_sendnocrc);
11008 #else
11009                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11010                         SCTP_STAT_INCR(sctps_sendswcrc);
11011 #endif
11012                         if (V_udp_cksum) {
11013                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11014                         }
11015                 } else {
11016 #if defined(SCTP_WITH_NO_CSUM)
11017                         SCTP_STAT_INCR(sctps_sendnocrc);
11018 #else
11019                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11020                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11021                         SCTP_STAT_INCR(sctps_sendhwcrc);
11022 #endif
11023                 }
11024 #ifdef SCTP_PACKET_LOGGING
11025                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11026                         sctp_packet_log(o_pak);
11027                 }
11028 #endif
11029                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11030                 break;
11031 #endif
11032 #ifdef INET6
11033         case AF_INET6:
11034                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11035                 if (port) {
11036 #if defined(SCTP_WITH_NO_CSUM)
11037                         SCTP_STAT_INCR(sctps_sendnocrc);
11038 #else
11039                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11040                         SCTP_STAT_INCR(sctps_sendswcrc);
11041 #endif
11042                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11043                                 udp->uh_sum = 0xffff;
11044                         }
11045                 } else {
11046 #if defined(SCTP_WITH_NO_CSUM)
11047                         SCTP_STAT_INCR(sctps_sendnocrc);
11048 #else
11049                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11050                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11051                         SCTP_STAT_INCR(sctps_sendhwcrc);
11052 #endif
11053                 }
11054 #ifdef SCTP_PACKET_LOGGING
11055                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11056                         sctp_packet_log(o_pak);
11057                 }
11058 #endif
11059                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11060                 break;
11061 #endif
11062         default:
11063                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11064                     dst->sa_family);
11065                 sctp_m_freem(mout);
11066                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11067                 return;
11068         }
11069         SCTP_STAT_INCR(sctps_sendpackets);
11070         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11071         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11072         return;
11073 }
11074
11075 void
11076 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11077     struct sctphdr *sh,
11078     uint8_t use_mflowid, uint32_t mflowid,
11079     uint32_t vrf_id, uint16_t port)
11080 {
11081         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11082             use_mflowid, mflowid,
11083             vrf_id, port);
11084 }
11085
11086 void
11087 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11088 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11089     SCTP_UNUSED
11090 #endif
11091 )
11092 {
11093         struct sctp_tmit_chunk *chk;
11094         struct sctp_heartbeat_chunk *hb;
11095         struct timeval now;
11096
11097         SCTP_TCB_LOCK_ASSERT(stcb);
11098         if (net == NULL) {
11099                 return;
11100         }
11101         (void)SCTP_GETTIME_TIMEVAL(&now);
11102         switch (net->ro._l_addr.sa.sa_family) {
11103 #ifdef INET
11104         case AF_INET:
11105                 break;
11106 #endif
11107 #ifdef INET6
11108         case AF_INET6:
11109                 break;
11110 #endif
11111         default:
11112                 return;
11113         }
11114         sctp_alloc_a_chunk(stcb, chk);
11115         if (chk == NULL) {
11116                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11117                 return;
11118         }
11119         chk->copy_by_ref = 0;
11120         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11121         chk->rec.chunk_id.can_take_data = 1;
11122         chk->asoc = &stcb->asoc;
11123         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11124
11125         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11126         if (chk->data == NULL) {
11127                 sctp_free_a_chunk(stcb, chk, so_locked);
11128                 return;
11129         }
11130         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11131         SCTP_BUF_LEN(chk->data) = chk->send_size;
11132         chk->sent = SCTP_DATAGRAM_UNSENT;
11133         chk->snd_count = 0;
11134         chk->whoTo = net;
11135         atomic_add_int(&chk->whoTo->ref_count, 1);
11136         /* Now we have a mbuf that we can fill in with the details */
11137         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11138         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11139         /* fill out chunk header */
11140         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11141         hb->ch.chunk_flags = 0;
11142         hb->ch.chunk_length = htons(chk->send_size);
11143         /* Fill out hb parameter */
11144         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11145         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11146         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11147         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11148         /* Did our user request this one, put it in */
11149         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11150         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11151         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11152                 /*
11153                  * we only take from the entropy pool if the address is not
11154                  * confirmed.
11155                  */
11156                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11157                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11158         } else {
11159                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11160                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11161         }
11162         switch (net->ro._l_addr.sa.sa_family) {
11163 #ifdef INET
11164         case AF_INET:
11165                 memcpy(hb->heartbeat.hb_info.address,
11166                     &net->ro._l_addr.sin.sin_addr,
11167                     sizeof(net->ro._l_addr.sin.sin_addr));
11168                 break;
11169 #endif
11170 #ifdef INET6
11171         case AF_INET6:
11172                 memcpy(hb->heartbeat.hb_info.address,
11173                     &net->ro._l_addr.sin6.sin6_addr,
11174                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11175                 break;
11176 #endif
11177         default:
11178                 return;
11179                 break;
11180         }
11181         net->hb_responded = 0;
11182         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11183         stcb->asoc.ctrl_queue_cnt++;
11184         SCTP_STAT_INCR(sctps_sendheartbeat);
11185         return;
11186 }
11187
11188 void
11189 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11190     uint32_t high_tsn)
11191 {
11192         struct sctp_association *asoc;
11193         struct sctp_ecne_chunk *ecne;
11194         struct sctp_tmit_chunk *chk;
11195
11196         if (net == NULL) {
11197                 return;
11198         }
11199         asoc = &stcb->asoc;
11200         SCTP_TCB_LOCK_ASSERT(stcb);
11201         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11202                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11203                         /* found a previous ECN_ECHO update it if needed */
11204                         uint32_t cnt, ctsn;
11205
11206                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11207                         ctsn = ntohl(ecne->tsn);
11208                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11209                                 ecne->tsn = htonl(high_tsn);
11210                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11211                         }
11212                         cnt = ntohl(ecne->num_pkts_since_cwr);
11213                         cnt++;
11214                         ecne->num_pkts_since_cwr = htonl(cnt);
11215                         return;
11216                 }
11217         }
11218         /* nope could not find one to update so we must build one */
11219         sctp_alloc_a_chunk(stcb, chk);
11220         if (chk == NULL) {
11221                 return;
11222         }
11223         chk->copy_by_ref = 0;
11224         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11225         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11226         chk->rec.chunk_id.can_take_data = 0;
11227         chk->asoc = &stcb->asoc;
11228         chk->send_size = sizeof(struct sctp_ecne_chunk);
11229         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11230         if (chk->data == NULL) {
11231                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11232                 return;
11233         }
11234         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11235         SCTP_BUF_LEN(chk->data) = chk->send_size;
11236         chk->sent = SCTP_DATAGRAM_UNSENT;
11237         chk->snd_count = 0;
11238         chk->whoTo = net;
11239         atomic_add_int(&chk->whoTo->ref_count, 1);
11240
11241         stcb->asoc.ecn_echo_cnt_onq++;
11242         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11243         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11244         ecne->ch.chunk_flags = 0;
11245         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11246         ecne->tsn = htonl(high_tsn);
11247         ecne->num_pkts_since_cwr = htonl(1);
11248         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11249         asoc->ctrl_queue_cnt++;
11250 }
11251
11252 void
11253 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11254     struct mbuf *m, int len, int iphlen, int bad_crc)
11255 {
11256         struct sctp_association *asoc;
11257         struct sctp_pktdrop_chunk *drp;
11258         struct sctp_tmit_chunk *chk;
11259         uint8_t *datap;
11260         int was_trunc = 0;
11261         int fullsz = 0;
11262         long spc;
11263         int offset;
11264         struct sctp_chunkhdr *ch, chunk_buf;
11265         unsigned int chk_length;
11266
11267         if (!stcb) {
11268                 return;
11269         }
11270         asoc = &stcb->asoc;
11271         SCTP_TCB_LOCK_ASSERT(stcb);
11272         if (asoc->peer_supports_pktdrop == 0) {
11273                 /*-
11274                  * peer must declare support before I send one.
11275                  */
11276                 return;
11277         }
11278         if (stcb->sctp_socket == NULL) {
11279                 return;
11280         }
11281         sctp_alloc_a_chunk(stcb, chk);
11282         if (chk == NULL) {
11283                 return;
11284         }
11285         chk->copy_by_ref = 0;
11286         len -= iphlen;
11287         chk->send_size = len;
11288         /* Validate that we do not have an ABORT in here. */
11289         offset = iphlen + sizeof(struct sctphdr);
11290         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11291             sizeof(*ch), (uint8_t *) & chunk_buf);
11292         while (ch != NULL) {
11293                 chk_length = ntohs(ch->chunk_length);
11294                 if (chk_length < sizeof(*ch)) {
11295                         /* break to abort land */
11296                         break;
11297                 }
11298                 switch (ch->chunk_type) {
11299                 case SCTP_PACKET_DROPPED:
11300                 case SCTP_ABORT_ASSOCIATION:
11301                 case SCTP_INITIATION_ACK:
11302                         /**
11303                          * We don't respond with an PKT-DROP to an ABORT
11304                          * or PKT-DROP. We also do not respond to an
11305                          * INIT-ACK, because we can't know if the initiation
11306                          * tag is correct or not.
11307                          */
11308                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11309                         return;
11310                 default:
11311                         break;
11312                 }
11313                 offset += SCTP_SIZE32(chk_length);
11314                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11315                     sizeof(*ch), (uint8_t *) & chunk_buf);
11316         }
11317
11318         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11319             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11320                 /*
11321                  * only send 1 mtu worth, trim off the excess on the end.
11322                  */
11323                 fullsz = len;
11324                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11325                 was_trunc = 1;
11326         }
11327         chk->asoc = &stcb->asoc;
11328         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11329         if (chk->data == NULL) {
11330 jump_out:
11331                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11332                 return;
11333         }
11334         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11335         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11336         if (drp == NULL) {
11337                 sctp_m_freem(chk->data);
11338                 chk->data = NULL;
11339                 goto jump_out;
11340         }
11341         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11342             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11343         chk->book_size_scale = 0;
11344         if (was_trunc) {
11345                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11346                 drp->trunc_len = htons(fullsz);
11347                 /*
11348                  * Len is already adjusted to size minus overhead above take
11349                  * out the pkt_drop chunk itself from it.
11350                  */
11351                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11352                 len = chk->send_size;
11353         } else {
11354                 /* no truncation needed */
11355                 drp->ch.chunk_flags = 0;
11356                 drp->trunc_len = htons(0);
11357         }
11358         if (bad_crc) {
11359                 drp->ch.chunk_flags |= SCTP_BADCRC;
11360         }
11361         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11362         SCTP_BUF_LEN(chk->data) = chk->send_size;
11363         chk->sent = SCTP_DATAGRAM_UNSENT;
11364         chk->snd_count = 0;
11365         if (net) {
11366                 /* we should hit here */
11367                 chk->whoTo = net;
11368                 atomic_add_int(&chk->whoTo->ref_count, 1);
11369         } else {
11370                 chk->whoTo = NULL;
11371         }
11372         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11373         chk->rec.chunk_id.can_take_data = 1;
11374         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11375         drp->ch.chunk_length = htons(chk->send_size);
11376         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11377         if (spc < 0) {
11378                 spc = 0;
11379         }
11380         drp->bottle_bw = htonl(spc);
11381         if (asoc->my_rwnd) {
11382                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11383                     asoc->size_on_all_streams +
11384                     asoc->my_rwnd_control_len +
11385                     stcb->sctp_socket->so_rcv.sb_cc);
11386         } else {
11387                 /*-
11388                  * If my rwnd is 0, possibly from mbuf depletion as well as
11389                  * space used, tell the peer there is NO space aka onq == bw
11390                  */
11391                 drp->current_onq = htonl(spc);
11392         }
11393         drp->reserved = 0;
11394         datap = drp->data;
11395         m_copydata(m, iphlen, len, (caddr_t)datap);
11396         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11397         asoc->ctrl_queue_cnt++;
11398 }
11399
11400 void
11401 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11402 {
11403         struct sctp_association *asoc;
11404         struct sctp_cwr_chunk *cwr;
11405         struct sctp_tmit_chunk *chk;
11406
11407         SCTP_TCB_LOCK_ASSERT(stcb);
11408         if (net == NULL) {
11409                 return;
11410         }
11411         asoc = &stcb->asoc;
11412         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11413                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11414                         /*
11415                          * found a previous CWR queued to same destination
11416                          * update it if needed
11417                          */
11418                         uint32_t ctsn;
11419
11420                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11421                         ctsn = ntohl(cwr->tsn);
11422                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11423                                 cwr->tsn = htonl(high_tsn);
11424                         }
11425                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11426                                 /* Make sure override is carried */
11427                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11428                         }
11429                         return;
11430                 }
11431         }
11432         sctp_alloc_a_chunk(stcb, chk);
11433         if (chk == NULL) {
11434                 return;
11435         }
11436         chk->copy_by_ref = 0;
11437         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11438         chk->rec.chunk_id.can_take_data = 1;
11439         chk->asoc = &stcb->asoc;
11440         chk->send_size = sizeof(struct sctp_cwr_chunk);
11441         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11442         if (chk->data == NULL) {
11443                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11444                 return;
11445         }
11446         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11447         SCTP_BUF_LEN(chk->data) = chk->send_size;
11448         chk->sent = SCTP_DATAGRAM_UNSENT;
11449         chk->snd_count = 0;
11450         chk->whoTo = net;
11451         atomic_add_int(&chk->whoTo->ref_count, 1);
11452         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11453         cwr->ch.chunk_type = SCTP_ECN_CWR;
11454         cwr->ch.chunk_flags = override;
11455         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11456         cwr->tsn = htonl(high_tsn);
11457         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11458         asoc->ctrl_queue_cnt++;
11459 }
11460
11461 void
11462 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11463     int number_entries, uint16_t * list,
11464     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11465 {
11466         uint16_t len, old_len, i;
11467         struct sctp_stream_reset_out_request *req_out;
11468         struct sctp_chunkhdr *ch;
11469
11470         ch = mtod(chk->data, struct sctp_chunkhdr *);
11471         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11472
11473         /* get to new offset for the param. */
11474         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11475         /* now how long will this param be? */
11476         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11477         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11478         req_out->ph.param_length = htons(len);
11479         req_out->request_seq = htonl(seq);
11480         req_out->response_seq = htonl(resp_seq);
11481         req_out->send_reset_at_tsn = htonl(last_sent);
11482         if (number_entries) {
11483                 for (i = 0; i < number_entries; i++) {
11484                         req_out->list_of_streams[i] = htons(list[i]);
11485                 }
11486         }
11487         if (SCTP_SIZE32(len) > len) {
11488                 /*-
11489                  * Need to worry about the pad we may end up adding to the
11490                  * end. This is easy since the struct is either aligned to 4
11491                  * bytes or 2 bytes off.
11492                  */
11493                 req_out->list_of_streams[number_entries] = 0;
11494         }
11495         /* now fix the chunk length */
11496         ch->chunk_length = htons(len + old_len);
11497         chk->book_size = len + old_len;
11498         chk->book_size_scale = 0;
11499         chk->send_size = SCTP_SIZE32(chk->book_size);
11500         SCTP_BUF_LEN(chk->data) = chk->send_size;
11501         return;
11502 }
11503
11504 static void
11505 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11506     int number_entries, uint16_t * list,
11507     uint32_t seq)
11508 {
11509         uint16_t len, old_len, i;
11510         struct sctp_stream_reset_in_request *req_in;
11511         struct sctp_chunkhdr *ch;
11512
11513         ch = mtod(chk->data, struct sctp_chunkhdr *);
11514         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11515
11516         /* get to new offset for the param. */
11517         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11518         /* now how long will this param be? */
11519         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11520         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11521         req_in->ph.param_length = htons(len);
11522         req_in->request_seq = htonl(seq);
11523         if (number_entries) {
11524                 for (i = 0; i < number_entries; i++) {
11525                         req_in->list_of_streams[i] = htons(list[i]);
11526                 }
11527         }
11528         if (SCTP_SIZE32(len) > len) {
11529                 /*-
11530                  * Need to worry about the pad we may end up adding to the
11531                  * end. This is easy since the struct is either aligned to 4
11532                  * bytes or 2 bytes off.
11533                  */
11534                 req_in->list_of_streams[number_entries] = 0;
11535         }
11536         /* now fix the chunk length */
11537         ch->chunk_length = htons(len + old_len);
11538         chk->book_size = len + old_len;
11539         chk->book_size_scale = 0;
11540         chk->send_size = SCTP_SIZE32(chk->book_size);
11541         SCTP_BUF_LEN(chk->data) = chk->send_size;
11542         return;
11543 }
11544
11545 static void
11546 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11547     uint32_t seq)
11548 {
11549         uint16_t len, old_len;
11550         struct sctp_stream_reset_tsn_request *req_tsn;
11551         struct sctp_chunkhdr *ch;
11552
11553         ch = mtod(chk->data, struct sctp_chunkhdr *);
11554         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11555
11556         /* get to new offset for the param. */
11557         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11558         /* now how long will this param be? */
11559         len = sizeof(struct sctp_stream_reset_tsn_request);
11560         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11561         req_tsn->ph.param_length = htons(len);
11562         req_tsn->request_seq = htonl(seq);
11563
11564         /* now fix the chunk length */
11565         ch->chunk_length = htons(len + old_len);
11566         chk->send_size = len + old_len;
11567         chk->book_size = SCTP_SIZE32(chk->send_size);
11568         chk->book_size_scale = 0;
11569         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11570         return;
11571 }
11572
11573 void
11574 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11575     uint32_t resp_seq, uint32_t result)
11576 {
11577         uint16_t len, old_len;
11578         struct sctp_stream_reset_response *resp;
11579         struct sctp_chunkhdr *ch;
11580
11581         ch = mtod(chk->data, struct sctp_chunkhdr *);
11582         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11583
11584         /* get to new offset for the param. */
11585         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11586         /* now how long will this param be? */
11587         len = sizeof(struct sctp_stream_reset_response);
11588         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11589         resp->ph.param_length = htons(len);
11590         resp->response_seq = htonl(resp_seq);
11591         resp->result = ntohl(result);
11592
11593         /* now fix the chunk length */
11594         ch->chunk_length = htons(len + old_len);
11595         chk->book_size = len + old_len;
11596         chk->book_size_scale = 0;
11597         chk->send_size = SCTP_SIZE32(chk->book_size);
11598         SCTP_BUF_LEN(chk->data) = chk->send_size;
11599         return;
11600 }
11601
11602 void
11603 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11604     uint32_t resp_seq, uint32_t result,
11605     uint32_t send_una, uint32_t recv_next)
11606 {
11607         uint16_t len, old_len;
11608         struct sctp_stream_reset_response_tsn *resp;
11609         struct sctp_chunkhdr *ch;
11610
11611         ch = mtod(chk->data, struct sctp_chunkhdr *);
11612         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11613
11614         /* get to new offset for the param. */
11615         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11616         /* now how long will this param be? */
11617         len = sizeof(struct sctp_stream_reset_response_tsn);
11618         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11619         resp->ph.param_length = htons(len);
11620         resp->response_seq = htonl(resp_seq);
11621         resp->result = htonl(result);
11622         resp->senders_next_tsn = htonl(send_una);
11623         resp->receivers_next_tsn = htonl(recv_next);
11624
11625         /* now fix the chunk length */
11626         ch->chunk_length = htons(len + old_len);
11627         chk->book_size = len + old_len;
11628         chk->send_size = SCTP_SIZE32(chk->book_size);
11629         chk->book_size_scale = 0;
11630         SCTP_BUF_LEN(chk->data) = chk->send_size;
11631         return;
11632 }
11633
11634 static void
11635 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11636     uint32_t seq,
11637     uint16_t adding)
11638 {
11639         uint16_t len, old_len;
11640         struct sctp_chunkhdr *ch;
11641         struct sctp_stream_reset_add_strm *addstr;
11642
11643         ch = mtod(chk->data, struct sctp_chunkhdr *);
11644         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11645
11646         /* get to new offset for the param. */
11647         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11648         /* now how long will this param be? */
11649         len = sizeof(struct sctp_stream_reset_add_strm);
11650
11651         /* Fill it out. */
11652         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11653         addstr->ph.param_length = htons(len);
11654         addstr->request_seq = htonl(seq);
11655         addstr->number_of_streams = htons(adding);
11656         addstr->reserved = 0;
11657
11658         /* now fix the chunk length */
11659         ch->chunk_length = htons(len + old_len);
11660         chk->send_size = len + old_len;
11661         chk->book_size = SCTP_SIZE32(chk->send_size);
11662         chk->book_size_scale = 0;
11663         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11664         return;
11665 }
11666
11667 static void
11668 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11669     uint32_t seq,
11670     uint16_t adding)
11671 {
11672         uint16_t len, old_len;
11673         struct sctp_chunkhdr *ch;
11674         struct sctp_stream_reset_add_strm *addstr;
11675
11676         ch = mtod(chk->data, struct sctp_chunkhdr *);
11677         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11678
11679         /* get to new offset for the param. */
11680         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11681         /* now how long will this param be? */
11682         len = sizeof(struct sctp_stream_reset_add_strm);
11683         /* Fill it out. */
11684         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11685         addstr->ph.param_length = htons(len);
11686         addstr->request_seq = htonl(seq);
11687         addstr->number_of_streams = htons(adding);
11688         addstr->reserved = 0;
11689
11690         /* now fix the chunk length */
11691         ch->chunk_length = htons(len + old_len);
11692         chk->send_size = len + old_len;
11693         chk->book_size = SCTP_SIZE32(chk->send_size);
11694         chk->book_size_scale = 0;
11695         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11696         return;
11697 }
11698
11699 int
11700 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11701     int number_entries, uint16_t * list,
11702     uint8_t send_out_req,
11703     uint8_t send_in_req,
11704     uint8_t send_tsn_req,
11705     uint8_t add_stream,
11706     uint16_t adding_o,
11707     uint16_t adding_i, uint8_t peer_asked)
11708 {
11709
11710         struct sctp_association *asoc;
11711         struct sctp_tmit_chunk *chk;
11712         struct sctp_chunkhdr *ch;
11713         uint32_t seq;
11714
11715         asoc = &stcb->asoc;
11716         if (asoc->stream_reset_outstanding) {
11717                 /*-
11718                  * Already one pending, must get ACK back to clear the flag.
11719                  */
11720                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11721                 return (EBUSY);
11722         }
11723         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11724             (add_stream == 0)) {
11725                 /* nothing to do */
11726                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11727                 return (EINVAL);
11728         }
11729         if (send_tsn_req && (send_out_req || send_in_req)) {
11730                 /* error, can't do that */
11731                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11732                 return (EINVAL);
11733         }
11734         sctp_alloc_a_chunk(stcb, chk);
11735         if (chk == NULL) {
11736                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11737                 return (ENOMEM);
11738         }
11739         chk->copy_by_ref = 0;
11740         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11741         chk->rec.chunk_id.can_take_data = 0;
11742         chk->asoc = &stcb->asoc;
11743         chk->book_size = sizeof(struct sctp_chunkhdr);
11744         chk->send_size = SCTP_SIZE32(chk->book_size);
11745         chk->book_size_scale = 0;
11746
11747         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11748         if (chk->data == NULL) {
11749                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11750                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11751                 return (ENOMEM);
11752         }
11753         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11754
11755         /* setup chunk parameters */
11756         chk->sent = SCTP_DATAGRAM_UNSENT;
11757         chk->snd_count = 0;
11758         if (stcb->asoc.alternate) {
11759                 chk->whoTo = stcb->asoc.alternate;
11760         } else {
11761                 chk->whoTo = stcb->asoc.primary_destination;
11762         }
11763         atomic_add_int(&chk->whoTo->ref_count, 1);
11764         ch = mtod(chk->data, struct sctp_chunkhdr *);
11765         ch->chunk_type = SCTP_STREAM_RESET;
11766         ch->chunk_flags = 0;
11767         ch->chunk_length = htons(chk->book_size);
11768         SCTP_BUF_LEN(chk->data) = chk->send_size;
11769
11770         seq = stcb->asoc.str_reset_seq_out;
11771         if (send_out_req) {
11772                 sctp_add_stream_reset_out(chk, number_entries, list,
11773                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11774                 asoc->stream_reset_out_is_outstanding = 1;
11775                 seq++;
11776                 asoc->stream_reset_outstanding++;
11777         }
11778         if ((add_stream & 1) &&
11779             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11780                 /* Need to allocate more */
11781                 struct sctp_stream_out *oldstream;
11782                 struct sctp_stream_queue_pending *sp, *nsp;
11783                 int i;
11784
11785                 oldstream = stcb->asoc.strmout;
11786                 /* get some more */
11787                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11788                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11789                     SCTP_M_STRMO);
11790                 if (stcb->asoc.strmout == NULL) {
11791                         uint8_t x;
11792
11793                         stcb->asoc.strmout = oldstream;
11794                         /* Turn off the bit */
11795                         x = add_stream & 0xfe;
11796                         add_stream = x;
11797                         goto skip_stuff;
11798                 }
11799                 /*
11800                  * Ok now we proceed with copying the old out stuff and
11801                  * initializing the new stuff.
11802                  */
11803                 SCTP_TCB_SEND_LOCK(stcb);
11804                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11805                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11806                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11807                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11808                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11809                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11810                         stcb->asoc.strmout[i].stream_no = i;
11811                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11812                         /* now anything on those queues? */
11813                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11814                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11815                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11816                         }
11817                         /* Now move assoc pointers too */
11818                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11819                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11820                         }
11821                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11822                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11823                         }
11824                 }
11825                 /* now the new streams */
11826                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11827                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11828                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11829                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11830                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11831                         stcb->asoc.strmout[i].stream_no = i;
11832                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11833                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11834                 }
11835                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11836                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11837                 SCTP_TCB_SEND_UNLOCK(stcb);
11838         }
11839 skip_stuff:
11840         if ((add_stream & 1) && (adding_o > 0)) {
11841                 asoc->strm_pending_add_size = adding_o;
11842                 asoc->peer_req_out = peer_asked;
11843                 sctp_add_an_out_stream(chk, seq, adding_o);
11844                 seq++;
11845                 asoc->stream_reset_outstanding++;
11846         }
11847         if ((add_stream & 2) && (adding_i > 0)) {
11848                 sctp_add_an_in_stream(chk, seq, adding_i);
11849                 seq++;
11850                 asoc->stream_reset_outstanding++;
11851         }
11852         if (send_in_req) {
11853                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11854                 seq++;
11855                 asoc->stream_reset_outstanding++;
11856         }
11857         if (send_tsn_req) {
11858                 sctp_add_stream_reset_tsn(chk, seq);
11859                 asoc->stream_reset_outstanding++;
11860         }
11861         asoc->str_reset = chk;
11862         /* insert the chunk for sending */
11863         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11864             chk,
11865             sctp_next);
11866         asoc->ctrl_queue_cnt++;
11867         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11868         return (0);
11869 }
11870
11871 void
11872 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11873     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11874     uint8_t use_mflowid, uint32_t mflowid,
11875     uint32_t vrf_id, uint16_t port)
11876 {
11877         /* Don't respond to an ABORT with an ABORT. */
11878         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11879                 if (cause)
11880                         sctp_m_freem(cause);
11881                 return;
11882         }
11883         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11884             use_mflowid, mflowid,
11885             vrf_id, port);
11886         return;
11887 }
11888
11889 void
11890 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11891     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11892     uint8_t use_mflowid, uint32_t mflowid,
11893     uint32_t vrf_id, uint16_t port)
11894 {
11895         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11896             use_mflowid, mflowid,
11897             vrf_id, port);
11898         return;
11899 }
11900
11901 static struct mbuf *
11902 sctp_copy_resume(struct uio *uio,
11903     int max_send_len,
11904     int user_marks_eor,
11905     int *error,
11906     uint32_t * sndout,
11907     struct mbuf **new_tail)
11908 {
11909         struct mbuf *m;
11910
11911         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11912             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11913         if (m == NULL) {
11914                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
11915                 *error = ENOBUFS;
11916         } else {
11917                 *sndout = m_length(m, NULL);
11918                 *new_tail = m_last(m);
11919         }
11920         return (m);
11921 }
11922
11923 static int
11924 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11925     struct uio *uio,
11926     int resv_upfront)
11927 {
11928         int left;
11929
11930         left = sp->length;
11931         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11932             resv_upfront, 0);
11933         if (sp->data == NULL) {
11934                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
11935                 return (ENOBUFS);
11936         }
11937         sp->tail_mbuf = m_last(sp->data);
11938         return (0);
11939 }
11940
11941
11942
11943 static struct sctp_stream_queue_pending *
11944 sctp_copy_it_in(struct sctp_tcb *stcb,
11945     struct sctp_association *asoc,
11946     struct sctp_sndrcvinfo *srcv,
11947     struct uio *uio,
11948     struct sctp_nets *net,
11949     int max_send_len,
11950     int user_marks_eor,
11951     int *error)
11952 {
11953         /*-
11954          * This routine must be very careful in its work. Protocol
11955          * processing is up and running so care must be taken to spl...()
11956          * when you need to do something that may effect the stcb/asoc. The
11957          * sb is locked however. When data is copied the protocol processing
11958          * should be enabled since this is a slower operation...
11959          */
11960         struct sctp_stream_queue_pending *sp = NULL;
11961         int resv_in_first;
11962
11963         *error = 0;
11964         /* Now can we send this? */
11965         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11966             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11967             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11968             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11969                 /* got data while shutting down */
11970                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11971                 *error = ECONNRESET;
11972                 goto out_now;
11973         }
11974         sctp_alloc_a_strmoq(stcb, sp);
11975         if (sp == NULL) {
11976                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11977                 *error = ENOMEM;
11978                 goto out_now;
11979         }
11980         sp->act_flags = 0;
11981         sp->sender_all_done = 0;
11982         sp->sinfo_flags = srcv->sinfo_flags;
11983         sp->timetolive = srcv->sinfo_timetolive;
11984         sp->ppid = srcv->sinfo_ppid;
11985         sp->context = srcv->sinfo_context;
11986         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11987
11988         sp->stream = srcv->sinfo_stream;
11989         sp->length = min(uio->uio_resid, max_send_len);
11990         if ((sp->length == (uint32_t) uio->uio_resid) &&
11991             ((user_marks_eor == 0) ||
11992             (srcv->sinfo_flags & SCTP_EOF) ||
11993             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11994                 sp->msg_is_complete = 1;
11995         } else {
11996                 sp->msg_is_complete = 0;
11997         }
11998         sp->sender_all_done = 0;
11999         sp->some_taken = 0;
12000         sp->put_last_out = 0;
12001         resv_in_first = sizeof(struct sctp_data_chunk);
12002         sp->data = sp->tail_mbuf = NULL;
12003         if (sp->length == 0) {
12004                 *error = 0;
12005                 goto skip_copy;
12006         }
12007         if (srcv->sinfo_keynumber_valid) {
12008                 sp->auth_keyid = srcv->sinfo_keynumber;
12009         } else {
12010                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12011         }
12012         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12013                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12014                 sp->holds_key_ref = 1;
12015         }
12016         *error = sctp_copy_one(sp, uio, resv_in_first);
12017 skip_copy:
12018         if (*error) {
12019                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12020                 sp = NULL;
12021         } else {
12022                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12023                         sp->net = net;
12024                         atomic_add_int(&sp->net->ref_count, 1);
12025                 } else {
12026                         sp->net = NULL;
12027                 }
12028                 sctp_set_prsctp_policy(sp);
12029         }
12030 out_now:
12031         return (sp);
12032 }
12033
12034
12035 int
12036 sctp_sosend(struct socket *so,
12037     struct sockaddr *addr,
12038     struct uio *uio,
12039     struct mbuf *top,
12040     struct mbuf *control,
12041     int flags,
12042     struct thread *p
12043 )
12044 {
12045         int error, use_sndinfo = 0;
12046         struct sctp_sndrcvinfo sndrcvninfo;
12047         struct sockaddr *addr_to_use;
12048
12049 #if defined(INET) && defined(INET6)
12050         struct sockaddr_in sin;
12051
12052 #endif
12053
12054         if (control) {
12055                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12056                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12057                     sizeof(sndrcvninfo))) {
12058                         /* got one */
12059                         use_sndinfo = 1;
12060                 }
12061         }
12062         addr_to_use = addr;
12063 #if defined(INET) && defined(INET6)
12064         if ((addr) && (addr->sa_family == AF_INET6)) {
12065                 struct sockaddr_in6 *sin6;
12066
12067                 sin6 = (struct sockaddr_in6 *)addr;
12068                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12069                         in6_sin6_2_sin(&sin, sin6);
12070                         addr_to_use = (struct sockaddr *)&sin;
12071                 }
12072         }
12073 #endif
12074         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12075             control,
12076             flags,
12077             use_sndinfo ? &sndrcvninfo : NULL
12078             ,p
12079             );
12080         return (error);
12081 }
12082
12083
12084 int
12085 sctp_lower_sosend(struct socket *so,
12086     struct sockaddr *addr,
12087     struct uio *uio,
12088     struct mbuf *i_pak,
12089     struct mbuf *control,
12090     int flags,
12091     struct sctp_sndrcvinfo *srcv
12092     ,
12093     struct thread *p
12094 )
12095 {
12096         unsigned int sndlen = 0, max_len;
12097         int error, len;
12098         struct mbuf *top = NULL;
12099         int queue_only = 0, queue_only_for_init = 0;
12100         int free_cnt_applied = 0;
12101         int un_sent;
12102         int now_filled = 0;
12103         unsigned int inqueue_bytes = 0;
12104         struct sctp_block_entry be;
12105         struct sctp_inpcb *inp;
12106         struct sctp_tcb *stcb = NULL;
12107         struct timeval now;
12108         struct sctp_nets *net;
12109         struct sctp_association *asoc;
12110         struct sctp_inpcb *t_inp;
12111         int user_marks_eor;
12112         int create_lock_applied = 0;
12113         int nagle_applies = 0;
12114         int some_on_control = 0;
12115         int got_all_of_the_send = 0;
12116         int hold_tcblock = 0;
12117         int non_blocking = 0;
12118         uint32_t local_add_more, local_soresv = 0;
12119         uint16_t port;
12120         uint16_t sinfo_flags;
12121         sctp_assoc_t sinfo_assoc_id;
12122
12123         error = 0;
12124         net = NULL;
12125         stcb = NULL;
12126         asoc = NULL;
12127
12128         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12129         if (inp == NULL) {
12130                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12131                 error = EINVAL;
12132                 if (i_pak) {
12133                         SCTP_RELEASE_PKT(i_pak);
12134                 }
12135                 return (error);
12136         }
12137         if ((uio == NULL) && (i_pak == NULL)) {
12138                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12139                 return (EINVAL);
12140         }
12141         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12142         atomic_add_int(&inp->total_sends, 1);
12143         if (uio) {
12144                 if (uio->uio_resid < 0) {
12145                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12146                         return (EINVAL);
12147                 }
12148                 sndlen = uio->uio_resid;
12149         } else {
12150                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12151                 sndlen = SCTP_HEADER_LEN(i_pak);
12152         }
12153         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12154             (void *)addr,
12155             sndlen);
12156         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12157             (inp->sctp_socket->so_qlimit)) {
12158                 /* The listener can NOT send */
12159                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12160                 error = ENOTCONN;
12161                 goto out_unlocked;
12162         }
12163         /**
12164          * Pre-screen address, if one is given the sin-len
12165          * must be set correctly!
12166          */
12167         if (addr) {
12168                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12169
12170                 switch (raddr->sa.sa_family) {
12171 #ifdef INET
12172                 case AF_INET:
12173                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12174                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12175                                 error = EINVAL;
12176                                 goto out_unlocked;
12177                         }
12178                         port = raddr->sin.sin_port;
12179                         break;
12180 #endif
12181 #ifdef INET6
12182                 case AF_INET6:
12183                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12184                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12185                                 error = EINVAL;
12186                                 goto out_unlocked;
12187                         }
12188                         port = raddr->sin6.sin6_port;
12189                         break;
12190 #endif
12191                 default:
12192                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12193                         error = EAFNOSUPPORT;
12194                         goto out_unlocked;
12195                 }
12196         } else
12197                 port = 0;
12198
12199         if (srcv) {
12200                 sinfo_flags = srcv->sinfo_flags;
12201                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12202                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12203                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12204                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12205                         error = EINVAL;
12206                         goto out_unlocked;
12207                 }
12208                 if (srcv->sinfo_flags)
12209                         SCTP_STAT_INCR(sctps_sends_with_flags);
12210         } else {
12211                 sinfo_flags = inp->def_send.sinfo_flags;
12212                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12213         }
12214         if (sinfo_flags & SCTP_SENDALL) {
12215                 /* its a sendall */
12216                 error = sctp_sendall(inp, uio, top, srcv);
12217                 top = NULL;
12218                 goto out_unlocked;
12219         }
12220         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12221                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12222                 error = EINVAL;
12223                 goto out_unlocked;
12224         }
12225         /* now we must find the assoc */
12226         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12227             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12228                 SCTP_INP_RLOCK(inp);
12229                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12230                 if (stcb) {
12231                         SCTP_TCB_LOCK(stcb);
12232                         hold_tcblock = 1;
12233                 }
12234                 SCTP_INP_RUNLOCK(inp);
12235         } else if (sinfo_assoc_id) {
12236                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12237         } else if (addr) {
12238                 /*-
12239                  * Since we did not use findep we must
12240                  * increment it, and if we don't find a tcb
12241                  * decrement it.
12242                  */
12243                 SCTP_INP_WLOCK(inp);
12244                 SCTP_INP_INCR_REF(inp);
12245                 SCTP_INP_WUNLOCK(inp);
12246                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12247                 if (stcb == NULL) {
12248                         SCTP_INP_WLOCK(inp);
12249                         SCTP_INP_DECR_REF(inp);
12250                         SCTP_INP_WUNLOCK(inp);
12251                 } else {
12252                         hold_tcblock = 1;
12253                 }
12254         }
12255         if ((stcb == NULL) && (addr)) {
12256                 /* Possible implicit send? */
12257                 SCTP_ASOC_CREATE_LOCK(inp);
12258                 create_lock_applied = 1;
12259                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12260                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12261                         /* Should I really unlock ? */
12262                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12263                         error = EINVAL;
12264                         goto out_unlocked;
12265
12266                 }
12267                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12268                     (addr->sa_family == AF_INET6)) {
12269                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12270                         error = EINVAL;
12271                         goto out_unlocked;
12272                 }
12273                 SCTP_INP_WLOCK(inp);
12274                 SCTP_INP_INCR_REF(inp);
12275                 SCTP_INP_WUNLOCK(inp);
12276                 /* With the lock applied look again */
12277                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12278                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12279                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12280                 }
12281                 if (stcb == NULL) {
12282                         SCTP_INP_WLOCK(inp);
12283                         SCTP_INP_DECR_REF(inp);
12284                         SCTP_INP_WUNLOCK(inp);
12285                 } else {
12286                         hold_tcblock = 1;
12287                 }
12288                 if (error) {
12289                         goto out_unlocked;
12290                 }
12291                 if (t_inp != inp) {
12292                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12293                         error = ENOTCONN;
12294                         goto out_unlocked;
12295                 }
12296         }
12297         if (stcb == NULL) {
12298                 if (addr == NULL) {
12299                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12300                         error = ENOENT;
12301                         goto out_unlocked;
12302                 } else {
12303                         /* We must go ahead and start the INIT process */
12304                         uint32_t vrf_id;
12305
12306                         if ((sinfo_flags & SCTP_ABORT) ||
12307                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12308                                 /*-
12309                                  * User asks to abort a non-existant assoc,
12310                                  * or EOF a non-existant assoc with no data
12311                                  */
12312                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12313                                 error = ENOENT;
12314                                 goto out_unlocked;
12315                         }
12316                         /* get an asoc/stcb struct */
12317                         vrf_id = inp->def_vrf_id;
12318 #ifdef INVARIANTS
12319                         if (create_lock_applied == 0) {
12320                                 panic("Error, should hold create lock and I don't?");
12321                         }
12322 #endif
12323                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12324                             p
12325                             );
12326                         if (stcb == NULL) {
12327                                 /* Error is setup for us in the call */
12328                                 goto out_unlocked;
12329                         }
12330                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12331                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12332                                 /*
12333                                  * Set the connected flag so we can queue
12334                                  * data
12335                                  */
12336                                 soisconnecting(so);
12337                         }
12338                         hold_tcblock = 1;
12339                         if (create_lock_applied) {
12340                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12341                                 create_lock_applied = 0;
12342                         } else {
12343                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12344                         }
12345                         /*
12346                          * Turn on queue only flag to prevent data from
12347                          * being sent
12348                          */
12349                         queue_only = 1;
12350                         asoc = &stcb->asoc;
12351                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12352                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12353
12354                         /* initialize authentication params for the assoc */
12355                         sctp_initialize_auth_params(inp, stcb);
12356
12357                         if (control) {
12358                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12359                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12360                                         hold_tcblock = 0;
12361                                         stcb = NULL;
12362                                         goto out_unlocked;
12363                                 }
12364                         }
12365                         /* out with the INIT */
12366                         queue_only_for_init = 1;
12367                         /*-
12368                          * we may want to dig in after this call and adjust the MTU
12369                          * value. It defaulted to 1500 (constant) but the ro
12370                          * structure may now have an update and thus we may need to
12371                          * change it BEFORE we append the message.
12372                          */
12373                 }
12374         } else
12375                 asoc = &stcb->asoc;
12376         if (srcv == NULL)
12377                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12378         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12379                 if (addr)
12380                         net = sctp_findnet(stcb, addr);
12381                 else
12382                         net = NULL;
12383                 if ((net == NULL) ||
12384                     ((port != 0) && (port != stcb->rport))) {
12385                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12386                         error = EINVAL;
12387                         goto out_unlocked;
12388                 }
12389         } else {
12390                 if (stcb->asoc.alternate) {
12391                         net = stcb->asoc.alternate;
12392                 } else {
12393                         net = stcb->asoc.primary_destination;
12394                 }
12395         }
12396         atomic_add_int(&stcb->total_sends, 1);
12397         /* Keep the stcb from being freed under our feet */
12398         atomic_add_int(&asoc->refcnt, 1);
12399         free_cnt_applied = 1;
12400
12401         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12402                 if (sndlen > asoc->smallest_mtu) {
12403                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12404                         error = EMSGSIZE;
12405                         goto out_unlocked;
12406                 }
12407         }
12408         if (SCTP_SO_IS_NBIO(so)
12409             || (flags & MSG_NBIO)
12410             ) {
12411                 non_blocking = 1;
12412         }
12413         /* would we block? */
12414         if (non_blocking) {
12415                 if (hold_tcblock == 0) {
12416                         SCTP_TCB_LOCK(stcb);
12417                         hold_tcblock = 1;
12418                 }
12419                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12420                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12421                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12422                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12423                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12424                                 error = EMSGSIZE;
12425                         else
12426                                 error = EWOULDBLOCK;
12427                         goto out_unlocked;
12428                 }
12429                 stcb->asoc.sb_send_resv += sndlen;
12430                 SCTP_TCB_UNLOCK(stcb);
12431                 hold_tcblock = 0;
12432         } else {
12433                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12434         }
12435         local_soresv = sndlen;
12436         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12437                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12438                 error = ECONNRESET;
12439                 goto out_unlocked;
12440         }
12441         if (create_lock_applied) {
12442                 SCTP_ASOC_CREATE_UNLOCK(inp);
12443                 create_lock_applied = 0;
12444         }
12445         if (asoc->stream_reset_outstanding) {
12446                 /*
12447                  * Can't queue any data while stream reset is underway.
12448                  */
12449                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12450                 error = EAGAIN;
12451                 goto out_unlocked;
12452         }
12453         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12454             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12455                 queue_only = 1;
12456         }
12457         /* we are now done with all control */
12458         if (control) {
12459                 sctp_m_freem(control);
12460                 control = NULL;
12461         }
12462         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12463             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12464             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12465             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12466                 if (srcv->sinfo_flags & SCTP_ABORT) {
12467                         ;
12468                 } else {
12469                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12470                         error = ECONNRESET;
12471                         goto out_unlocked;
12472                 }
12473         }
12474         /* Ok, we will attempt a msgsnd :> */
12475         if (p) {
12476                 p->td_ru.ru_msgsnd++;
12477         }
12478         /* Are we aborting? */
12479         if (srcv->sinfo_flags & SCTP_ABORT) {
12480                 struct mbuf *mm;
12481                 int tot_demand, tot_out = 0, max_out;
12482
12483                 SCTP_STAT_INCR(sctps_sends_with_abort);
12484                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12485                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12486                         /* It has to be up before we abort */
12487                         /* how big is the user initiated abort? */
12488                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12489                         error = EINVAL;
12490                         goto out;
12491                 }
12492                 if (hold_tcblock) {
12493                         SCTP_TCB_UNLOCK(stcb);
12494                         hold_tcblock = 0;
12495                 }
12496                 if (top) {
12497                         struct mbuf *cntm = NULL;
12498
12499                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12500                         if (sndlen != 0) {
12501                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12502                                         tot_out += SCTP_BUF_LEN(cntm);
12503                                 }
12504                         }
12505                 } else {
12506                         /* Must fit in a MTU */
12507                         tot_out = sndlen;
12508                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12509                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12510                                 /* To big */
12511                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12512                                 error = EMSGSIZE;
12513                                 goto out;
12514                         }
12515                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12516                 }
12517                 if (mm == NULL) {
12518                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12519                         error = ENOMEM;
12520                         goto out;
12521                 }
12522                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12523                 max_out -= sizeof(struct sctp_abort_msg);
12524                 if (tot_out > max_out) {
12525                         tot_out = max_out;
12526                 }
12527                 if (mm) {
12528                         struct sctp_paramhdr *ph;
12529
12530                         /* now move forward the data pointer */
12531                         ph = mtod(mm, struct sctp_paramhdr *);
12532                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12533                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12534                         ph++;
12535                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12536                         if (top == NULL) {
12537                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12538                                 if (error) {
12539                                         /*-
12540                                          * Here if we can't get his data we
12541                                          * still abort we just don't get to
12542                                          * send the users note :-0
12543                                          */
12544                                         sctp_m_freem(mm);
12545                                         mm = NULL;
12546                                 }
12547                         } else {
12548                                 if (sndlen != 0) {
12549                                         SCTP_BUF_NEXT(mm) = top;
12550                                 }
12551                         }
12552                 }
12553                 if (hold_tcblock == 0) {
12554                         SCTP_TCB_LOCK(stcb);
12555                 }
12556                 atomic_add_int(&stcb->asoc.refcnt, -1);
12557                 free_cnt_applied = 0;
12558                 /* release this lock, otherwise we hang on ourselves */
12559                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12560                 /* now relock the stcb so everything is sane */
12561                 hold_tcblock = 0;
12562                 stcb = NULL;
12563                 /*
12564                  * In this case top is already chained to mm avoid double
12565                  * free, since we free it below if top != NULL and driver
12566                  * would free it after sending the packet out
12567                  */
12568                 if (sndlen != 0) {
12569                         top = NULL;
12570                 }
12571                 goto out_unlocked;
12572         }
12573         /* Calculate the maximum we can send */
12574         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12575         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12576                 if (non_blocking) {
12577                         /* we already checked for non-blocking above. */
12578                         max_len = sndlen;
12579                 } else {
12580                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12581                 }
12582         } else {
12583                 max_len = 0;
12584         }
12585         if (hold_tcblock) {
12586                 SCTP_TCB_UNLOCK(stcb);
12587                 hold_tcblock = 0;
12588         }
12589         /* Is the stream no. valid? */
12590         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12591                 /* Invalid stream number */
12592                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12593                 error = EINVAL;
12594                 goto out_unlocked;
12595         }
12596         if (asoc->strmout == NULL) {
12597                 /* huh? software error */
12598                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12599                 error = EFAULT;
12600                 goto out_unlocked;
12601         }
12602         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12603         if ((user_marks_eor == 0) &&
12604             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12605                 /* It will NEVER fit */
12606                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12607                 error = EMSGSIZE;
12608                 goto out_unlocked;
12609         }
12610         if ((uio == NULL) && user_marks_eor) {
12611                 /*-
12612                  * We do not support eeor mode for
12613                  * sending with mbuf chains (like sendfile).
12614                  */
12615                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12616                 error = EINVAL;
12617                 goto out_unlocked;
12618         }
12619         if (user_marks_eor) {
12620                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12621         } else {
12622                 /*-
12623                  * For non-eeor the whole message must fit in
12624                  * the socket send buffer.
12625                  */
12626                 local_add_more = sndlen;
12627         }
12628         len = 0;
12629         if (non_blocking) {
12630                 goto skip_preblock;
12631         }
12632         if (((max_len <= local_add_more) &&
12633             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12634             (max_len == 0) ||
12635             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12636                 /* No room right now ! */
12637                 SOCKBUF_LOCK(&so->so_snd);
12638                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12639                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12640                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12641                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12642                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12643                             inqueue_bytes,
12644                             local_add_more,
12645                             stcb->asoc.stream_queue_cnt,
12646                             stcb->asoc.chunks_on_out_queue,
12647                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12648                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12649                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12650                         }
12651                         be.error = 0;
12652                         stcb->block_entry = &be;
12653                         error = sbwait(&so->so_snd);
12654                         stcb->block_entry = NULL;
12655                         if (error || so->so_error || be.error) {
12656                                 if (error == 0) {
12657                                         if (so->so_error)
12658                                                 error = so->so_error;
12659                                         if (be.error) {
12660                                                 error = be.error;
12661                                         }
12662                                 }
12663                                 SOCKBUF_UNLOCK(&so->so_snd);
12664                                 goto out_unlocked;
12665                         }
12666                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12667                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12668                                     asoc, stcb->asoc.total_output_queue_size);
12669                         }
12670                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12671                                 goto out_unlocked;
12672                         }
12673                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12674                 }
12675                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12676                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12677                 } else {
12678                         max_len = 0;
12679                 }
12680                 SOCKBUF_UNLOCK(&so->so_snd);
12681         }
12682 skip_preblock:
12683         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12684                 goto out_unlocked;
12685         }
12686         /*
12687          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12688          * case NOTE: uio will be null when top/mbuf is passed
12689          */
12690         if (sndlen == 0) {
12691                 if (srcv->sinfo_flags & SCTP_EOF) {
12692                         got_all_of_the_send = 1;
12693                         goto dataless_eof;
12694                 } else {
12695                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12696                         error = EINVAL;
12697                         goto out;
12698                 }
12699         }
12700         if (top == NULL) {
12701                 struct sctp_stream_queue_pending *sp;
12702                 struct sctp_stream_out *strm;
12703                 uint32_t sndout;
12704
12705                 SCTP_TCB_SEND_LOCK(stcb);
12706                 if ((asoc->stream_locked) &&
12707                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12708                         SCTP_TCB_SEND_UNLOCK(stcb);
12709                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12710                         error = EINVAL;
12711                         goto out;
12712                 }
12713                 SCTP_TCB_SEND_UNLOCK(stcb);
12714
12715                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12716                 if (strm->last_msg_incomplete == 0) {
12717         do_a_copy_in:
12718                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12719                         if ((sp == NULL) || (error)) {
12720                                 goto out;
12721                         }
12722                         SCTP_TCB_SEND_LOCK(stcb);
12723                         if (sp->msg_is_complete) {
12724                                 strm->last_msg_incomplete = 0;
12725                                 asoc->stream_locked = 0;
12726                         } else {
12727                                 /*
12728                                  * Just got locked to this guy in case of an
12729                                  * interrupt.
12730                                  */
12731                                 strm->last_msg_incomplete = 1;
12732                                 asoc->stream_locked = 1;
12733                                 asoc->stream_locked_on = srcv->sinfo_stream;
12734                                 sp->sender_all_done = 0;
12735                         }
12736                         sctp_snd_sb_alloc(stcb, sp->length);
12737                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12738                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12739                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12740                         }
12741                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12742                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12743                         SCTP_TCB_SEND_UNLOCK(stcb);
12744                 } else {
12745                         SCTP_TCB_SEND_LOCK(stcb);
12746                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12747                         SCTP_TCB_SEND_UNLOCK(stcb);
12748                         if (sp == NULL) {
12749                                 /* ???? Huh ??? last msg is gone */
12750 #ifdef INVARIANTS
12751                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12752 #else
12753                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12754                                 strm->last_msg_incomplete = 0;
12755 #endif
12756                                 goto do_a_copy_in;
12757
12758                         }
12759                 }
12760                 while (uio->uio_resid > 0) {
12761                         /* How much room do we have? */
12762                         struct mbuf *new_tail, *mm;
12763
12764                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12765                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12766                         else
12767                                 max_len = 0;
12768
12769                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12770                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12771                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12772                                 sndout = 0;
12773                                 new_tail = NULL;
12774                                 if (hold_tcblock) {
12775                                         SCTP_TCB_UNLOCK(stcb);
12776                                         hold_tcblock = 0;
12777                                 }
12778                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12779                                 if ((mm == NULL) || error) {
12780                                         if (mm) {
12781                                                 sctp_m_freem(mm);
12782                                         }
12783                                         goto out;
12784                                 }
12785                                 /* Update the mbuf and count */
12786                                 SCTP_TCB_SEND_LOCK(stcb);
12787                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12788                                         /*
12789                                          * we need to get out. Peer probably
12790                                          * aborted.
12791                                          */
12792                                         sctp_m_freem(mm);
12793                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12794                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12795                                                 error = ECONNRESET;
12796                                         }
12797                                         SCTP_TCB_SEND_UNLOCK(stcb);
12798                                         goto out;
12799                                 }
12800                                 if (sp->tail_mbuf) {
12801                                         /* tack it to the end */
12802                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12803                                         sp->tail_mbuf = new_tail;
12804                                 } else {
12805                                         /* A stolen mbuf */
12806                                         sp->data = mm;
12807                                         sp->tail_mbuf = new_tail;
12808                                 }
12809                                 sctp_snd_sb_alloc(stcb, sndout);
12810                                 atomic_add_int(&sp->length, sndout);
12811                                 len += sndout;
12812
12813                                 /* Did we reach EOR? */
12814                                 if ((uio->uio_resid == 0) &&
12815                                     ((user_marks_eor == 0) ||
12816                                     (srcv->sinfo_flags & SCTP_EOF) ||
12817                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12818                                         sp->msg_is_complete = 1;
12819                                 } else {
12820                                         sp->msg_is_complete = 0;
12821                                 }
12822                                 SCTP_TCB_SEND_UNLOCK(stcb);
12823                         }
12824                         if (uio->uio_resid == 0) {
12825                                 /* got it all? */
12826                                 continue;
12827                         }
12828                         /* PR-SCTP? */
12829                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12830                                 /*
12831                                  * This is ugly but we must assure locking
12832                                  * order
12833                                  */
12834                                 if (hold_tcblock == 0) {
12835                                         SCTP_TCB_LOCK(stcb);
12836                                         hold_tcblock = 1;
12837                                 }
12838                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12839                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12840                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12841                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12842                                 else
12843                                         max_len = 0;
12844                                 if (max_len > 0) {
12845                                         continue;
12846                                 }
12847                                 SCTP_TCB_UNLOCK(stcb);
12848                                 hold_tcblock = 0;
12849                         }
12850                         /* wait for space now */
12851                         if (non_blocking) {
12852                                 /* Non-blocking io in place out */
12853                                 goto skip_out_eof;
12854                         }
12855                         /* What about the INIT, send it maybe */
12856                         if (queue_only_for_init) {
12857                                 if (hold_tcblock == 0) {
12858                                         SCTP_TCB_LOCK(stcb);
12859                                         hold_tcblock = 1;
12860                                 }
12861                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12862                                         /* a collision took us forward? */
12863                                         queue_only = 0;
12864                                 } else {
12865                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12866                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12867                                         queue_only = 1;
12868                                 }
12869                         }
12870                         if ((net->flight_size > net->cwnd) &&
12871                             (asoc->sctp_cmt_on_off == 0)) {
12872                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12873                                 queue_only = 1;
12874                         } else if (asoc->ifp_had_enobuf) {
12875                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12876                                 if (net->flight_size > (2 * net->mtu)) {
12877                                         queue_only = 1;
12878                                 }
12879                                 asoc->ifp_had_enobuf = 0;
12880                         }
12881                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12882                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12883                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12884                             (stcb->asoc.total_flight > 0) &&
12885                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12886                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12887
12888                                 /*-
12889                                  * Ok, Nagle is set on and we have data outstanding.
12890                                  * Don't send anything and let SACKs drive out the
12891                                  * data unless wen have a "full" segment to send.
12892                                  */
12893                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12894                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12895                                 }
12896                                 SCTP_STAT_INCR(sctps_naglequeued);
12897                                 nagle_applies = 1;
12898                         } else {
12899                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12900                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12901                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12902                                 }
12903                                 SCTP_STAT_INCR(sctps_naglesent);
12904                                 nagle_applies = 0;
12905                         }
12906                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12907
12908                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12909                                     nagle_applies, un_sent);
12910                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12911                                     stcb->asoc.total_flight,
12912                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12913                         }
12914                         if (queue_only_for_init)
12915                                 queue_only_for_init = 0;
12916                         if ((queue_only == 0) && (nagle_applies == 0)) {
12917                                 /*-
12918                                  * need to start chunk output
12919                                  * before blocking.. note that if
12920                                  * a lock is already applied, then
12921                                  * the input via the net is happening
12922                                  * and I don't need to start output :-D
12923                                  */
12924                                 if (hold_tcblock == 0) {
12925                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12926                                                 hold_tcblock = 1;
12927                                                 sctp_chunk_output(inp,
12928                                                     stcb,
12929                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12930                                         }
12931                                 } else {
12932                                         sctp_chunk_output(inp,
12933                                             stcb,
12934                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12935                                 }
12936                                 if (hold_tcblock == 1) {
12937                                         SCTP_TCB_UNLOCK(stcb);
12938                                         hold_tcblock = 0;
12939                                 }
12940                         }
12941                         SOCKBUF_LOCK(&so->so_snd);
12942                         /*-
12943                          * This is a bit strange, but I think it will
12944                          * work. The total_output_queue_size is locked and
12945                          * protected by the TCB_LOCK, which we just released.
12946                          * There is a race that can occur between releasing it
12947                          * above, and me getting the socket lock, where sacks
12948                          * come in but we have not put the SB_WAIT on the
12949                          * so_snd buffer to get the wakeup. After the LOCK
12950                          * is applied the sack_processing will also need to
12951                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12952                          * once we have the socket buffer lock if we recheck the
12953                          * size we KNOW we will get to sleep safely with the
12954                          * wakeup flag in place.
12955                          */
12956                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12957                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12958                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12959                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12960                                             asoc, uio->uio_resid);
12961                                 }
12962                                 be.error = 0;
12963                                 stcb->block_entry = &be;
12964                                 error = sbwait(&so->so_snd);
12965                                 stcb->block_entry = NULL;
12966
12967                                 if (error || so->so_error || be.error) {
12968                                         if (error == 0) {
12969                                                 if (so->so_error)
12970                                                         error = so->so_error;
12971                                                 if (be.error) {
12972                                                         error = be.error;
12973                                                 }
12974                                         }
12975                                         SOCKBUF_UNLOCK(&so->so_snd);
12976                                         goto out_unlocked;
12977                                 }
12978                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12979                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12980                                             asoc, stcb->asoc.total_output_queue_size);
12981                                 }
12982                         }
12983                         SOCKBUF_UNLOCK(&so->so_snd);
12984                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12985                                 goto out_unlocked;
12986                         }
12987                 }
12988                 SCTP_TCB_SEND_LOCK(stcb);
12989                 if (sp) {
12990                         if (sp->msg_is_complete == 0) {
12991                                 strm->last_msg_incomplete = 1;
12992                                 asoc->stream_locked = 1;
12993                                 asoc->stream_locked_on = srcv->sinfo_stream;
12994                         } else {
12995                                 sp->sender_all_done = 1;
12996                                 strm->last_msg_incomplete = 0;
12997                                 asoc->stream_locked = 0;
12998                         }
12999                 } else {
13000                         SCTP_PRINTF("Huh no sp TSNH?\n");
13001                         strm->last_msg_incomplete = 0;
13002                         asoc->stream_locked = 0;
13003                 }
13004                 SCTP_TCB_SEND_UNLOCK(stcb);
13005                 if (uio->uio_resid == 0) {
13006                         got_all_of_the_send = 1;
13007                 }
13008         } else {
13009                 /* We send in a 0, since we do NOT have any locks */
13010                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13011                 top = NULL;
13012                 if (srcv->sinfo_flags & SCTP_EOF) {
13013                         /*
13014                          * This should only happen for Panda for the mbuf
13015                          * send case, which does NOT yet support EEOR mode.
13016                          * Thus, we can just set this flag to do the proper
13017                          * EOF handling.
13018                          */
13019                         got_all_of_the_send = 1;
13020                 }
13021         }
13022         if (error) {
13023                 goto out;
13024         }
13025 dataless_eof:
13026         /* EOF thing ? */
13027         if ((srcv->sinfo_flags & SCTP_EOF) &&
13028             (got_all_of_the_send == 1)) {
13029                 int cnt;
13030
13031                 SCTP_STAT_INCR(sctps_sends_with_eof);
13032                 error = 0;
13033                 if (hold_tcblock == 0) {
13034                         SCTP_TCB_LOCK(stcb);
13035                         hold_tcblock = 1;
13036                 }
13037                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13038                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13039                     TAILQ_EMPTY(&asoc->sent_queue) &&
13040                     (cnt == 0)) {
13041                         if (asoc->locked_on_sending) {
13042                                 goto abort_anyway;
13043                         }
13044                         /* there is nothing queued to send, so I'm done... */
13045                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13046                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13047                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13048                                 struct sctp_nets *netp;
13049
13050                                 /* only send SHUTDOWN the first time through */
13051                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13052                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13053                                 }
13054                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13055                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13056                                 sctp_stop_timers_for_shutdown(stcb);
13057                                 if (stcb->asoc.alternate) {
13058                                         netp = stcb->asoc.alternate;
13059                                 } else {
13060                                         netp = stcb->asoc.primary_destination;
13061                                 }
13062                                 sctp_send_shutdown(stcb, netp);
13063                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13064                                     netp);
13065                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13066                                     asoc->primary_destination);
13067                         }
13068                 } else {
13069                         /*-
13070                          * we still got (or just got) data to send, so set
13071                          * SHUTDOWN_PENDING
13072                          */
13073                         /*-
13074                          * XXX sockets draft says that SCTP_EOF should be
13075                          * sent with no data.  currently, we will allow user
13076                          * data to be sent first and move to
13077                          * SHUTDOWN-PENDING
13078                          */
13079                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13080                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13081                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13082                                 if (hold_tcblock == 0) {
13083                                         SCTP_TCB_LOCK(stcb);
13084                                         hold_tcblock = 1;
13085                                 }
13086                                 if (asoc->locked_on_sending) {
13087                                         /* Locked to send out the data */
13088                                         struct sctp_stream_queue_pending *sp;
13089
13090                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13091                                         if (sp) {
13092                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13093                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13094                                         }
13095                                 }
13096                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13097                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13098                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13099                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13100                         abort_anyway:
13101                                         if (free_cnt_applied) {
13102                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13103                                                 free_cnt_applied = 0;
13104                                         }
13105                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13106                                             NULL, SCTP_SO_LOCKED);
13107                                         /*
13108                                          * now relock the stcb so everything
13109                                          * is sane
13110                                          */
13111                                         hold_tcblock = 0;
13112                                         stcb = NULL;
13113                                         goto out;
13114                                 }
13115                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13116                                     asoc->primary_destination);
13117                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13118                         }
13119                 }
13120         }
13121 skip_out_eof:
13122         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13123                 some_on_control = 1;
13124         }
13125         if (queue_only_for_init) {
13126                 if (hold_tcblock == 0) {
13127                         SCTP_TCB_LOCK(stcb);
13128                         hold_tcblock = 1;
13129                 }
13130                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13131                         /* a collision took us forward? */
13132                         queue_only = 0;
13133                 } else {
13134                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13135                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13136                         queue_only = 1;
13137                 }
13138         }
13139         if ((net->flight_size > net->cwnd) &&
13140             (stcb->asoc.sctp_cmt_on_off == 0)) {
13141                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13142                 queue_only = 1;
13143         } else if (asoc->ifp_had_enobuf) {
13144                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13145                 if (net->flight_size > (2 * net->mtu)) {
13146                         queue_only = 1;
13147                 }
13148                 asoc->ifp_had_enobuf = 0;
13149         }
13150         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13151             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13152         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13153             (stcb->asoc.total_flight > 0) &&
13154             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13155             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13156                 /*-
13157                  * Ok, Nagle is set on and we have data outstanding.
13158                  * Don't send anything and let SACKs drive out the
13159                  * data unless wen have a "full" segment to send.
13160                  */
13161                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13162                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13163                 }
13164                 SCTP_STAT_INCR(sctps_naglequeued);
13165                 nagle_applies = 1;
13166         } else {
13167                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13168                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13169                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13170                 }
13171                 SCTP_STAT_INCR(sctps_naglesent);
13172                 nagle_applies = 0;
13173         }
13174         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13175                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13176                     nagle_applies, un_sent);
13177                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13178                     stcb->asoc.total_flight,
13179                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13180         }
13181         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13182                 /* we can attempt to send too. */
13183                 if (hold_tcblock == 0) {
13184                         /*
13185                          * If there is activity recv'ing sacks no need to
13186                          * send
13187                          */
13188                         if (SCTP_TCB_TRYLOCK(stcb)) {
13189                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13190                                 hold_tcblock = 1;
13191                         }
13192                 } else {
13193                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13194                 }
13195         } else if ((queue_only == 0) &&
13196                     (stcb->asoc.peers_rwnd == 0) &&
13197             (stcb->asoc.total_flight == 0)) {
13198                 /* We get to have a probe outstanding */
13199                 if (hold_tcblock == 0) {
13200                         hold_tcblock = 1;
13201                         SCTP_TCB_LOCK(stcb);
13202                 }
13203                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13204         } else if (some_on_control) {
13205                 int num_out, reason, frag_point;
13206
13207                 /* Here we do control only */
13208                 if (hold_tcblock == 0) {
13209                         hold_tcblock = 1;
13210                         SCTP_TCB_LOCK(stcb);
13211                 }
13212                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13213                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13214                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13215         }
13216         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13217             queue_only, stcb->asoc.peers_rwnd, un_sent,
13218             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13219             stcb->asoc.total_output_queue_size, error);
13220
13221 out:
13222 out_unlocked:
13223
13224         if (local_soresv && stcb) {
13225                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13226         }
13227         if (create_lock_applied) {
13228                 SCTP_ASOC_CREATE_UNLOCK(inp);
13229         }
13230         if ((stcb) && hold_tcblock) {
13231                 SCTP_TCB_UNLOCK(stcb);
13232         }
13233         if (stcb && free_cnt_applied) {
13234                 atomic_add_int(&stcb->asoc.refcnt, -1);
13235         }
13236 #ifdef INVARIANTS
13237         if (stcb) {
13238                 if (mtx_owned(&stcb->tcb_mtx)) {
13239                         panic("Leaving with tcb mtx owned?");
13240                 }
13241                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13242                         panic("Leaving with tcb send mtx owned?");
13243                 }
13244         }
13245 #endif
13246 #ifdef INVARIANTS
13247         if (inp) {
13248                 sctp_validate_no_locks(inp);
13249         } else {
13250                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13251         }
13252 #endif
13253         if (top) {
13254                 sctp_m_freem(top);
13255         }
13256         if (control) {
13257                 sctp_m_freem(control);
13258         }
13259         return (error);
13260 }
13261
13262
13263 /*
13264  * generate an AUTHentication chunk, if required
13265  */
13266 struct mbuf *
13267 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13268     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13269     struct sctp_tcb *stcb, uint8_t chunk)
13270 {
13271         struct mbuf *m_auth;
13272         struct sctp_auth_chunk *auth;
13273         int chunk_len;
13274         struct mbuf *cn;
13275
13276         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13277             (stcb == NULL))
13278                 return (m);
13279
13280         /* sysctl disabled auth? */
13281         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13282                 return (m);
13283
13284         /* peer doesn't do auth... */
13285         if (!stcb->asoc.peer_supports_auth) {
13286                 return (m);
13287         }
13288         /* does the requested chunk require auth? */
13289         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13290                 return (m);
13291         }
13292         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13293         if (m_auth == NULL) {
13294                 /* no mbuf's */
13295                 return (m);
13296         }
13297         /* reserve some space if this will be the first mbuf */
13298         if (m == NULL)
13299                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13300         /* fill in the AUTH chunk details */
13301         auth = mtod(m_auth, struct sctp_auth_chunk *);
13302         bzero(auth, sizeof(*auth));
13303         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13304         auth->ch.chunk_flags = 0;
13305         chunk_len = sizeof(*auth) +
13306             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13307         auth->ch.chunk_length = htons(chunk_len);
13308         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13309         /* key id and hmac digest will be computed and filled in upon send */
13310
13311         /* save the offset where the auth was inserted into the chain */
13312         *offset = 0;
13313         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13314                 *offset += SCTP_BUF_LEN(cn);
13315         }
13316
13317         /* update length and return pointer to the auth chunk */
13318         SCTP_BUF_LEN(m_auth) = chunk_len;
13319         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13320         if (auth_ret != NULL)
13321                 *auth_ret = auth;
13322
13323         return (m);
13324 }
13325
13326 #ifdef INET6
13327 int
13328 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13329 {
13330         struct nd_prefix *pfx = NULL;
13331         struct nd_pfxrouter *pfxrtr = NULL;
13332         struct sockaddr_in6 gw6;
13333
13334         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13335                 return (0);
13336
13337         /* get prefix entry of address */
13338         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13339                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13340                         continue;
13341                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13342                     &src6->sin6_addr, &pfx->ndpr_mask))
13343                         break;
13344         }
13345         /* no prefix entry in the prefix list */
13346         if (pfx == NULL) {
13347                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13348                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13349                 return (0);
13350         }
13351         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13352         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13353
13354         /* search installed gateway from prefix entry */
13355         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13356                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13357                 gw6.sin6_family = AF_INET6;
13358                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13359                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13360                     sizeof(struct in6_addr));
13361                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13362                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13363                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13364                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13365                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13366                     ro->ro_rt->rt_gateway)) {
13367                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13368                         return (1);
13369                 }
13370         }
13371         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13372         return (0);
13373 }
13374
13375 #endif
13376
13377 int
13378 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13379 {
13380 #ifdef INET
13381         struct sockaddr_in *sin, *mask;
13382         struct ifaddr *ifa;
13383         struct in_addr srcnetaddr, gwnetaddr;
13384
13385         if (ro == NULL || ro->ro_rt == NULL ||
13386             sifa->address.sa.sa_family != AF_INET) {
13387                 return (0);
13388         }
13389         ifa = (struct ifaddr *)sifa->ifa;
13390         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13391         sin = (struct sockaddr_in *)&sifa->address.sin;
13392         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13393         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13394         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13395         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13396
13397         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13398         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13399         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13400         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13401         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13402         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13403                 return (1);
13404         }
13405 #endif
13406         return (0);
13407 }