sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2011, 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 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/udp.h>
  56 #include <machine/in_cksum.h>
  57
  58
  59
  60 #define SCTP_MAX_GAPS_INARRAY 4
  61 struct sack_track {
  62         uint8_t right_edge;     /* mergable on the right edge */
  63         uint8_t left_edge;      /* mergable on the left edge */
  64         uint8_t num_entries;
  65         uint8_t spare;
  66         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  67 };
  68
  69 struct sack_track sack_array[256] = {
  70         {0, 0, 0, 0,            /* 0x00 */
  71                 {{0, 0},
  72                 {0, 0},
  73                 {0, 0},
  74                 {0, 0}
  75                 }
  76         },
  77         {1, 0, 1, 0,            /* 0x01 */
  78                 {{0, 0},
  79                 {0, 0},
  80                 {0, 0},
  81                 {0, 0}
  82                 }
  83         },
  84         {0, 0, 1, 0,            /* 0x02 */
  85                 {{1, 1},
  86                 {0, 0},
  87                 {0, 0},
  88                 {0, 0}
  89                 }
  90         },
  91         {1, 0, 1, 0,            /* 0x03 */
  92                 {{0, 1},
  93                 {0, 0},
  94                 {0, 0},
  95                 {0, 0}
  96                 }
  97         },
  98         {0, 0, 1, 0,            /* 0x04 */
  99                 {{2, 2},
 100                 {0, 0},
 101                 {0, 0},
 102                 {0, 0}
 103                 }
 104         },
 105         {1, 0, 2, 0,            /* 0x05 */
 106                 {{0, 0},
 107                 {2, 2},
 108                 {0, 0},
 109                 {0, 0}
 110                 }
 111         },
 112         {0, 0, 1, 0,            /* 0x06 */
 113                 {{1, 2},
 114                 {0, 0},
 115                 {0, 0},
 116                 {0, 0}
 117                 }
 118         },
 119         {1, 0, 1, 0,            /* 0x07 */
 120                 {{0, 2},
 121                 {0, 0},
 122                 {0, 0},
 123                 {0, 0}
 124                 }
 125         },
 126         {0, 0, 1, 0,            /* 0x08 */
 127                 {{3, 3},
 128                 {0, 0},
 129                 {0, 0},
 130                 {0, 0}
 131                 }
 132         },
 133         {1, 0, 2, 0,            /* 0x09 */
 134                 {{0, 0},
 135                 {3, 3},
 136                 {0, 0},
 137                 {0, 0}
 138                 }
 139         },
 140         {0, 0, 2, 0,            /* 0x0a */
 141                 {{1, 1},
 142                 {3, 3},
 143                 {0, 0},
 144                 {0, 0}
 145                 }
 146         },
 147         {1, 0, 2, 0,            /* 0x0b */
 148                 {{0, 1},
 149                 {3, 3},
 150                 {0, 0},
 151                 {0, 0}
 152                 }
 153         },
 154         {0, 0, 1, 0,            /* 0x0c */
 155                 {{2, 3},
 156                 {0, 0},
 157                 {0, 0},
 158                 {0, 0}
 159                 }
 160         },
 161         {1, 0, 2, 0,            /* 0x0d */
 162                 {{0, 0},
 163                 {2, 3},
 164                 {0, 0},
 165                 {0, 0}
 166                 }
 167         },
 168         {0, 0, 1, 0,            /* 0x0e */
 169                 {{1, 3},
 170                 {0, 0},
 171                 {0, 0},
 172                 {0, 0}
 173                 }
 174         },
 175         {1, 0, 1, 0,            /* 0x0f */
 176                 {{0, 3},
 177                 {0, 0},
 178                 {0, 0},
 179                 {0, 0}
 180                 }
 181         },
 182         {0, 0, 1, 0,            /* 0x10 */
 183                 {{4, 4},
 184                 {0, 0},
 185                 {0, 0},
 186                 {0, 0}
 187                 }
 188         },
 189         {1, 0, 2, 0,            /* 0x11 */
 190                 {{0, 0},
 191                 {4, 4},
 192                 {0, 0},
 193                 {0, 0}
 194                 }
 195         },
 196         {0, 0, 2, 0,            /* 0x12 */
 197                 {{1, 1},
 198                 {4, 4},
 199                 {0, 0},
 200                 {0, 0}
 201                 }
 202         },
 203         {1, 0, 2, 0,            /* 0x13 */
 204                 {{0, 1},
 205                 {4, 4},
 206                 {0, 0},
 207                 {0, 0}
 208                 }
 209         },
 210         {0, 0, 2, 0,            /* 0x14 */
 211                 {{2, 2},
 212                 {4, 4},
 213                 {0, 0},
 214                 {0, 0}
 215                 }
 216         },
 217         {1, 0, 3, 0,            /* 0x15 */
 218                 {{0, 0},
 219                 {2, 2},
 220                 {4, 4},
 221                 {0, 0}
 222                 }
 223         },
 224         {0, 0, 2, 0,            /* 0x16 */
 225                 {{1, 2},
 226                 {4, 4},
 227                 {0, 0},
 228                 {0, 0}
 229                 }
 230         },
 231         {1, 0, 2, 0,            /* 0x17 */
 232                 {{0, 2},
 233                 {4, 4},
 234                 {0, 0},
 235                 {0, 0}
 236                 }
 237         },
 238         {0, 0, 1, 0,            /* 0x18 */
 239                 {{3, 4},
 240                 {0, 0},
 241                 {0, 0},
 242                 {0, 0}
 243                 }
 244         },
 245         {1, 0, 2, 0,            /* 0x19 */
 246                 {{0, 0},
 247                 {3, 4},
 248                 {0, 0},
 249                 {0, 0}
 250                 }
 251         },
 252         {0, 0, 2, 0,            /* 0x1a */
 253                 {{1, 1},
 254                 {3, 4},
 255                 {0, 0},
 256                 {0, 0}
 257                 }
 258         },
 259         {1, 0, 2, 0,            /* 0x1b */
 260                 {{0, 1},
 261                 {3, 4},
 262                 {0, 0},
 263                 {0, 0}
 264                 }
 265         },
 266         {0, 0, 1, 0,            /* 0x1c */
 267                 {{2, 4},
 268                 {0, 0},
 269                 {0, 0},
 270                 {0, 0}
 271                 }
 272         },
 273         {1, 0, 2, 0,            /* 0x1d */
 274                 {{0, 0},
 275                 {2, 4},
 276                 {0, 0},
 277                 {0, 0}
 278                 }
 279         },
 280         {0, 0, 1, 0,            /* 0x1e */
 281                 {{1, 4},
 282                 {0, 0},
 283                 {0, 0},
 284                 {0, 0}
 285                 }
 286         },
 287         {1, 0, 1, 0,            /* 0x1f */
 288                 {{0, 4},
 289                 {0, 0},
 290                 {0, 0},
 291                 {0, 0}
 292                 }
 293         },
 294         {0, 0, 1, 0,            /* 0x20 */
 295                 {{5, 5},
 296                 {0, 0},
 297                 {0, 0},
 298                 {0, 0}
 299                 }
 300         },
 301         {1, 0, 2, 0,            /* 0x21 */
 302                 {{0, 0},
 303                 {5, 5},
 304                 {0, 0},
 305                 {0, 0}
 306                 }
 307         },
 308         {0, 0, 2, 0,            /* 0x22 */
 309                 {{1, 1},
 310                 {5, 5},
 311                 {0, 0},
 312                 {0, 0}
 313                 }
 314         },
 315         {1, 0, 2, 0,            /* 0x23 */
 316                 {{0, 1},
 317                 {5, 5},
 318                 {0, 0},
 319                 {0, 0}
 320                 }
 321         },
 322         {0, 0, 2, 0,            /* 0x24 */
 323                 {{2, 2},
 324                 {5, 5},
 325                 {0, 0},
 326                 {0, 0}
 327                 }
 328         },
 329         {1, 0, 3, 0,            /* 0x25 */
 330                 {{0, 0},
 331                 {2, 2},
 332                 {5, 5},
 333                 {0, 0}
 334                 }
 335         },
 336         {0, 0, 2, 0,            /* 0x26 */
 337                 {{1, 2},
 338                 {5, 5},
 339                 {0, 0},
 340                 {0, 0}
 341                 }
 342         },
 343         {1, 0, 2, 0,            /* 0x27 */
 344                 {{0, 2},
 345                 {5, 5},
 346                 {0, 0},
 347                 {0, 0}
 348                 }
 349         },
 350         {0, 0, 2, 0,            /* 0x28 */
 351                 {{3, 3},
 352                 {5, 5},
 353                 {0, 0},
 354                 {0, 0}
 355                 }
 356         },
 357         {1, 0, 3, 0,            /* 0x29 */
 358                 {{0, 0},
 359                 {3, 3},
 360                 {5, 5},
 361                 {0, 0}
 362                 }
 363         },
 364         {0, 0, 3, 0,            /* 0x2a */
 365                 {{1, 1},
 366                 {3, 3},
 367                 {5, 5},
 368                 {0, 0}
 369                 }
 370         },
 371         {1, 0, 3, 0,            /* 0x2b */
 372                 {{0, 1},
 373                 {3, 3},
 374                 {5, 5},
 375                 {0, 0}
 376                 }
 377         },
 378         {0, 0, 2, 0,            /* 0x2c */
 379                 {{2, 3},
 380                 {5, 5},
 381                 {0, 0},
 382                 {0, 0}
 383                 }
 384         },
 385         {1, 0, 3, 0,            /* 0x2d */
 386                 {{0, 0},
 387                 {2, 3},
 388                 {5, 5},
 389                 {0, 0}
 390                 }
 391         },
 392         {0, 0, 2, 0,            /* 0x2e */
 393                 {{1, 3},
 394                 {5, 5},
 395                 {0, 0},
 396                 {0, 0}
 397                 }
 398         },
 399         {1, 0, 2, 0,            /* 0x2f */
 400                 {{0, 3},
 401                 {5, 5},
 402                 {0, 0},
 403                 {0, 0}
 404                 }
 405         },
 406         {0, 0, 1, 0,            /* 0x30 */
 407                 {{4, 5},
 408                 {0, 0},
 409                 {0, 0},
 410                 {0, 0}
 411                 }
 412         },
 413         {1, 0, 2, 0,            /* 0x31 */
 414                 {{0, 0},
 415                 {4, 5},
 416                 {0, 0},
 417                 {0, 0}
 418                 }
 419         },
 420         {0, 0, 2, 0,            /* 0x32 */
 421                 {{1, 1},
 422                 {4, 5},
 423                 {0, 0},
 424                 {0, 0}
 425                 }
 426         },
 427         {1, 0, 2, 0,            /* 0x33 */
 428                 {{0, 1},
 429                 {4, 5},
 430                 {0, 0},
 431                 {0, 0}
 432                 }
 433         },
 434         {0, 0, 2, 0,            /* 0x34 */
 435                 {{2, 2},
 436                 {4, 5},
 437                 {0, 0},
 438                 {0, 0}
 439                 }
 440         },
 441         {1, 0, 3, 0,            /* 0x35 */
 442                 {{0, 0},
 443                 {2, 2},
 444                 {4, 5},
 445                 {0, 0}
 446                 }
 447         },
 448         {0, 0, 2, 0,            /* 0x36 */
 449                 {{1, 2},
 450                 {4, 5},
 451                 {0, 0},
 452                 {0, 0}
 453                 }
 454         },
 455         {1, 0, 2, 0,            /* 0x37 */
 456                 {{0, 2},
 457                 {4, 5},
 458                 {0, 0},
 459                 {0, 0}
 460                 }
 461         },
 462         {0, 0, 1, 0,            /* 0x38 */
 463                 {{3, 5},
 464                 {0, 0},
 465                 {0, 0},
 466                 {0, 0}
 467                 }
 468         },
 469         {1, 0, 2, 0,            /* 0x39 */
 470                 {{0, 0},
 471                 {3, 5},
 472                 {0, 0},
 473                 {0, 0}
 474                 }
 475         },
 476         {0, 0, 2, 0,            /* 0x3a */
 477                 {{1, 1},
 478                 {3, 5},
 479                 {0, 0},
 480                 {0, 0}
 481                 }
 482         },
 483         {1, 0, 2, 0,            /* 0x3b */
 484                 {{0, 1},
 485                 {3, 5},
 486                 {0, 0},
 487                 {0, 0}
 488                 }
 489         },
 490         {0, 0, 1, 0,            /* 0x3c */
 491                 {{2, 5},
 492                 {0, 0},
 493                 {0, 0},
 494                 {0, 0}
 495                 }
 496         },
 497         {1, 0, 2, 0,            /* 0x3d */
 498                 {{0, 0},
 499                 {2, 5},
 500                 {0, 0},
 501                 {0, 0}
 502                 }
 503         },
 504         {0, 0, 1, 0,            /* 0x3e */
 505                 {{1, 5},
 506                 {0, 0},
 507                 {0, 0},
 508                 {0, 0}
 509                 }
 510         },
 511         {1, 0, 1, 0,            /* 0x3f */
 512                 {{0, 5},
 513                 {0, 0},
 514                 {0, 0},
 515                 {0, 0}
 516                 }
 517         },
 518         {0, 0, 1, 0,            /* 0x40 */
 519                 {{6, 6},
 520                 {0, 0},
 521                 {0, 0},
 522                 {0, 0}
 523                 }
 524         },
 525         {1, 0, 2, 0,            /* 0x41 */
 526                 {{0, 0},
 527                 {6, 6},
 528                 {0, 0},
 529                 {0, 0}
 530                 }
 531         },
 532         {0, 0, 2, 0,            /* 0x42 */
 533                 {{1, 1},
 534                 {6, 6},
 535                 {0, 0},
 536                 {0, 0}
 537                 }
 538         },
 539         {1, 0, 2, 0,            /* 0x43 */
 540                 {{0, 1},
 541                 {6, 6},
 542                 {0, 0},
 543                 {0, 0}
 544                 }
 545         },
 546         {0, 0, 2, 0,            /* 0x44 */
 547                 {{2, 2},
 548                 {6, 6},
 549                 {0, 0},
 550                 {0, 0}
 551                 }
 552         },
 553         {1, 0, 3, 0,            /* 0x45 */
 554                 {{0, 0},
 555                 {2, 2},
 556                 {6, 6},
 557                 {0, 0}
 558                 }
 559         },
 560         {0, 0, 2, 0,            /* 0x46 */
 561                 {{1, 2},
 562                 {6, 6},
 563                 {0, 0},
 564                 {0, 0}
 565                 }
 566         },
 567         {1, 0, 2, 0,            /* 0x47 */
 568                 {{0, 2},
 569                 {6, 6},
 570                 {0, 0},
 571                 {0, 0}
 572                 }
 573         },
 574         {0, 0, 2, 0,            /* 0x48 */
 575                 {{3, 3},
 576                 {6, 6},
 577                 {0, 0},
 578                 {0, 0}
 579                 }
 580         },
 581         {1, 0, 3, 0,            /* 0x49 */
 582                 {{0, 0},
 583                 {3, 3},
 584                 {6, 6},
 585                 {0, 0}
 586                 }
 587         },
 588         {0, 0, 3, 0,            /* 0x4a */
 589                 {{1, 1},
 590                 {3, 3},
 591                 {6, 6},
 592                 {0, 0}
 593                 }
 594         },
 595         {1, 0, 3, 0,            /* 0x4b */
 596                 {{0, 1},
 597                 {3, 3},
 598                 {6, 6},
 599                 {0, 0}
 600                 }
 601         },
 602         {0, 0, 2, 0,            /* 0x4c */
 603                 {{2, 3},
 604                 {6, 6},
 605                 {0, 0},
 606                 {0, 0}
 607                 }
 608         },
 609         {1, 0, 3, 0,            /* 0x4d */
 610                 {{0, 0},
 611                 {2, 3},
 612                 {6, 6},
 613                 {0, 0}
 614                 }
 615         },
 616         {0, 0, 2, 0,            /* 0x4e */
 617                 {{1, 3},
 618                 {6, 6},
 619                 {0, 0},
 620                 {0, 0}
 621                 }
 622         },
 623         {1, 0, 2, 0,            /* 0x4f */
 624                 {{0, 3},
 625                 {6, 6},
 626                 {0, 0},
 627                 {0, 0}
 628                 }
 629         },
 630         {0, 0, 2, 0,            /* 0x50 */
 631                 {{4, 4},
 632                 {6, 6},
 633                 {0, 0},
 634                 {0, 0}
 635                 }
 636         },
 637         {1, 0, 3, 0,            /* 0x51 */
 638                 {{0, 0},
 639                 {4, 4},
 640                 {6, 6},
 641                 {0, 0}
 642                 }
 643         },
 644         {0, 0, 3, 0,            /* 0x52 */
 645                 {{1, 1},
 646                 {4, 4},
 647                 {6, 6},
 648                 {0, 0}
 649                 }
 650         },
 651         {1, 0, 3, 0,            /* 0x53 */
 652                 {{0, 1},
 653                 {4, 4},
 654                 {6, 6},
 655                 {0, 0}
 656                 }
 657         },
 658         {0, 0, 3, 0,            /* 0x54 */
 659                 {{2, 2},
 660                 {4, 4},
 661                 {6, 6},
 662                 {0, 0}
 663                 }
 664         },
 665         {1, 0, 4, 0,            /* 0x55 */
 666                 {{0, 0},
 667                 {2, 2},
 668                 {4, 4},
 669                 {6, 6}
 670                 }
 671         },
 672         {0, 0, 3, 0,            /* 0x56 */
 673                 {{1, 2},
 674                 {4, 4},
 675                 {6, 6},
 676                 {0, 0}
 677                 }
 678         },
 679         {1, 0, 3, 0,            /* 0x57 */
 680                 {{0, 2},
 681                 {4, 4},
 682                 {6, 6},
 683                 {0, 0}
 684                 }
 685         },
 686         {0, 0, 2, 0,            /* 0x58 */
 687                 {{3, 4},
 688                 {6, 6},
 689                 {0, 0},
 690                 {0, 0}
 691                 }
 692         },
 693         {1, 0, 3, 0,            /* 0x59 */
 694                 {{0, 0},
 695                 {3, 4},
 696                 {6, 6},
 697                 {0, 0}
 698                 }
 699         },
 700         {0, 0, 3, 0,            /* 0x5a */
 701                 {{1, 1},
 702                 {3, 4},
 703                 {6, 6},
 704                 {0, 0}
 705                 }
 706         },
 707         {1, 0, 3, 0,            /* 0x5b */
 708                 {{0, 1},
 709                 {3, 4},
 710                 {6, 6},
 711                 {0, 0}
 712                 }
 713         },
 714         {0, 0, 2, 0,            /* 0x5c */
 715                 {{2, 4},
 716                 {6, 6},
 717                 {0, 0},
 718                 {0, 0}
 719                 }
 720         },
 721         {1, 0, 3, 0,            /* 0x5d */
 722                 {{0, 0},
 723                 {2, 4},
 724                 {6, 6},
 725                 {0, 0}
 726                 }
 727         },
 728         {0, 0, 2, 0,            /* 0x5e */
 729                 {{1, 4},
 730                 {6, 6},
 731                 {0, 0},
 732                 {0, 0}
 733                 }
 734         },
 735         {1, 0, 2, 0,            /* 0x5f */
 736                 {{0, 4},
 737                 {6, 6},
 738                 {0, 0},
 739                 {0, 0}
 740                 }
 741         },
 742         {0, 0, 1, 0,            /* 0x60 */
 743                 {{5, 6},
 744                 {0, 0},
 745                 {0, 0},
 746                 {0, 0}
 747                 }
 748         },
 749         {1, 0, 2, 0,            /* 0x61 */
 750                 {{0, 0},
 751                 {5, 6},
 752                 {0, 0},
 753                 {0, 0}
 754                 }
 755         },
 756         {0, 0, 2, 0,            /* 0x62 */
 757                 {{1, 1},
 758                 {5, 6},
 759                 {0, 0},
 760                 {0, 0}
 761                 }
 762         },
 763         {1, 0, 2, 0,            /* 0x63 */
 764                 {{0, 1},
 765                 {5, 6},
 766                 {0, 0},
 767                 {0, 0}
 768                 }
 769         },
 770         {0, 0, 2, 0,            /* 0x64 */
 771                 {{2, 2},
 772                 {5, 6},
 773                 {0, 0},
 774                 {0, 0}
 775                 }
 776         },
 777         {1, 0, 3, 0,            /* 0x65 */
 778                 {{0, 0},
 779                 {2, 2},
 780                 {5, 6},
 781                 {0, 0}
 782                 }
 783         },
 784         {0, 0, 2, 0,            /* 0x66 */
 785                 {{1, 2},
 786                 {5, 6},
 787                 {0, 0},
 788                 {0, 0}
 789                 }
 790         },
 791         {1, 0, 2, 0,            /* 0x67 */
 792                 {{0, 2},
 793                 {5, 6},
 794                 {0, 0},
 795                 {0, 0}
 796                 }
 797         },
 798         {0, 0, 2, 0,            /* 0x68 */
 799                 {{3, 3},
 800                 {5, 6},
 801                 {0, 0},
 802                 {0, 0}
 803                 }
 804         },
 805         {1, 0, 3, 0,            /* 0x69 */
 806                 {{0, 0},
 807                 {3, 3},
 808                 {5, 6},
 809                 {0, 0}
 810                 }
 811         },
 812         {0, 0, 3, 0,            /* 0x6a */
 813                 {{1, 1},
 814                 {3, 3},
 815                 {5, 6},
 816                 {0, 0}
 817                 }
 818         },
 819         {1, 0, 3, 0,            /* 0x6b */
 820                 {{0, 1},
 821                 {3, 3},
 822                 {5, 6},
 823                 {0, 0}
 824                 }
 825         },
 826         {0, 0, 2, 0,            /* 0x6c */
 827                 {{2, 3},
 828                 {5, 6},
 829                 {0, 0},
 830                 {0, 0}
 831                 }
 832         },
 833         {1, 0, 3, 0,            /* 0x6d */
 834                 {{0, 0},
 835                 {2, 3},
 836                 {5, 6},
 837                 {0, 0}
 838                 }
 839         },
 840         {0, 0, 2, 0,            /* 0x6e */
 841                 {{1, 3},
 842                 {5, 6},
 843                 {0, 0},
 844                 {0, 0}
 845                 }
 846         },
 847         {1, 0, 2, 0,            /* 0x6f */
 848                 {{0, 3},
 849                 {5, 6},
 850                 {0, 0},
 851                 {0, 0}
 852                 }
 853         },
 854         {0, 0, 1, 0,            /* 0x70 */
 855                 {{4, 6},
 856                 {0, 0},
 857                 {0, 0},
 858                 {0, 0}
 859                 }
 860         },
 861         {1, 0, 2, 0,            /* 0x71 */
 862                 {{0, 0},
 863                 {4, 6},
 864                 {0, 0},
 865                 {0, 0}
 866                 }
 867         },
 868         {0, 0, 2, 0,            /* 0x72 */
 869                 {{1, 1},
 870                 {4, 6},
 871                 {0, 0},
 872                 {0, 0}
 873                 }
 874         },
 875         {1, 0, 2, 0,            /* 0x73 */
 876                 {{0, 1},
 877                 {4, 6},
 878                 {0, 0},
 879                 {0, 0}
 880                 }
 881         },
 882         {0, 0, 2, 0,            /* 0x74 */
 883                 {{2, 2},
 884                 {4, 6},
 885                 {0, 0},
 886                 {0, 0}
 887                 }
 888         },
 889         {1, 0, 3, 0,            /* 0x75 */
 890                 {{0, 0},
 891                 {2, 2},
 892                 {4, 6},
 893                 {0, 0}
 894                 }
 895         },
 896         {0, 0, 2, 0,            /* 0x76 */
 897                 {{1, 2},
 898                 {4, 6},
 899                 {0, 0},
 900                 {0, 0}
 901                 }
 902         },
 903         {1, 0, 2, 0,            /* 0x77 */
 904                 {{0, 2},
 905                 {4, 6},
 906                 {0, 0},
 907                 {0, 0}
 908                 }
 909         },
 910         {0, 0, 1, 0,            /* 0x78 */
 911                 {{3, 6},
 912                 {0, 0},
 913                 {0, 0},
 914                 {0, 0}
 915                 }
 916         },
 917         {1, 0, 2, 0,            /* 0x79 */
 918                 {{0, 0},
 919                 {3, 6},
 920                 {0, 0},
 921                 {0, 0}
 922                 }
 923         },
 924         {0, 0, 2, 0,            /* 0x7a */
 925                 {{1, 1},
 926                 {3, 6},
 927                 {0, 0},
 928                 {0, 0}
 929                 }
 930         },
 931         {1, 0, 2, 0,            /* 0x7b */
 932                 {{0, 1},
 933                 {3, 6},
 934                 {0, 0},
 935                 {0, 0}
 936                 }
 937         },
 938         {0, 0, 1, 0,            /* 0x7c */
 939                 {{2, 6},
 940                 {0, 0},
 941                 {0, 0},
 942                 {0, 0}
 943                 }
 944         },
 945         {1, 0, 2, 0,            /* 0x7d */
 946                 {{0, 0},
 947                 {2, 6},
 948                 {0, 0},
 949                 {0, 0}
 950                 }
 951         },
 952         {0, 0, 1, 0,            /* 0x7e */
 953                 {{1, 6},
 954                 {0, 0},
 955                 {0, 0},
 956                 {0, 0}
 957                 }
 958         },
 959         {1, 0, 1, 0,            /* 0x7f */
 960                 {{0, 6},
 961                 {0, 0},
 962                 {0, 0},
 963                 {0, 0}
 964                 }
 965         },
 966         {0, 1, 1, 0,            /* 0x80 */
 967                 {{7, 7},
 968                 {0, 0},
 969                 {0, 0},
 970                 {0, 0}
 971                 }
 972         },
 973         {1, 1, 2, 0,            /* 0x81 */
 974                 {{0, 0},
 975                 {7, 7},
 976                 {0, 0},
 977                 {0, 0}
 978                 }
 979         },
 980         {0, 1, 2, 0,            /* 0x82 */
 981                 {{1, 1},
 982                 {7, 7},
 983                 {0, 0},
 984                 {0, 0}
 985                 }
 986         },
 987         {1, 1, 2, 0,            /* 0x83 */
 988                 {{0, 1},
 989                 {7, 7},
 990                 {0, 0},
 991                 {0, 0}
 992                 }
 993         },
 994         {0, 1, 2, 0,            /* 0x84 */
 995                 {{2, 2},
 996                 {7, 7},
 997                 {0, 0},
 998                 {0, 0}
 999                 }
1000         },
1001         {1, 1, 3, 0,            /* 0x85 */
1002                 {{0, 0},
1003                 {2, 2},
1004                 {7, 7},
1005                 {0, 0}
1006                 }
1007         },
1008         {0, 1, 2, 0,            /* 0x86 */
1009                 {{1, 2},
1010                 {7, 7},
1011                 {0, 0},
1012                 {0, 0}
1013                 }
1014         },
1015         {1, 1, 2, 0,            /* 0x87 */
1016                 {{0, 2},
1017                 {7, 7},
1018                 {0, 0},
1019                 {0, 0}
1020                 }
1021         },
1022         {0, 1, 2, 0,            /* 0x88 */
1023                 {{3, 3},
1024                 {7, 7},
1025                 {0, 0},
1026                 {0, 0}
1027                 }
1028         },
1029         {1, 1, 3, 0,            /* 0x89 */
1030                 {{0, 0},
1031                 {3, 3},
1032                 {7, 7},
1033                 {0, 0}
1034                 }
1035         },
1036         {0, 1, 3, 0,            /* 0x8a */
1037                 {{1, 1},
1038                 {3, 3},
1039                 {7, 7},
1040                 {0, 0}
1041                 }
1042         },
1043         {1, 1, 3, 0,            /* 0x8b */
1044                 {{0, 1},
1045                 {3, 3},
1046                 {7, 7},
1047                 {0, 0}
1048                 }
1049         },
1050         {0, 1, 2, 0,            /* 0x8c */
1051                 {{2, 3},
1052                 {7, 7},
1053                 {0, 0},
1054                 {0, 0}
1055                 }
1056         },
1057         {1, 1, 3, 0,            /* 0x8d */
1058                 {{0, 0},
1059                 {2, 3},
1060                 {7, 7},
1061                 {0, 0}
1062                 }
1063         },
1064         {0, 1, 2, 0,            /* 0x8e */
1065                 {{1, 3},
1066                 {7, 7},
1067                 {0, 0},
1068                 {0, 0}
1069                 }
1070         },
1071         {1, 1, 2, 0,            /* 0x8f */
1072                 {{0, 3},
1073                 {7, 7},
1074                 {0, 0},
1075                 {0, 0}
1076                 }
1077         },
1078         {0, 1, 2, 0,            /* 0x90 */
1079                 {{4, 4},
1080                 {7, 7},
1081                 {0, 0},
1082                 {0, 0}
1083                 }
1084         },
1085         {1, 1, 3, 0,            /* 0x91 */
1086                 {{0, 0},
1087                 {4, 4},
1088                 {7, 7},
1089                 {0, 0}
1090                 }
1091         },
1092         {0, 1, 3, 0,            /* 0x92 */
1093                 {{1, 1},
1094                 {4, 4},
1095                 {7, 7},
1096                 {0, 0}
1097                 }
1098         },
1099         {1, 1, 3, 0,            /* 0x93 */
1100                 {{0, 1},
1101                 {4, 4},
1102                 {7, 7},
1103                 {0, 0}
1104                 }
1105         },
1106         {0, 1, 3, 0,            /* 0x94 */
1107                 {{2, 2},
1108                 {4, 4},
1109                 {7, 7},
1110                 {0, 0}
1111                 }
1112         },
1113         {1, 1, 4, 0,            /* 0x95 */
1114                 {{0, 0},
1115                 {2, 2},
1116                 {4, 4},
1117                 {7, 7}
1118                 }
1119         },
1120         {0, 1, 3, 0,            /* 0x96 */
1121                 {{1, 2},
1122                 {4, 4},
1123                 {7, 7},
1124                 {0, 0}
1125                 }
1126         },
1127         {1, 1, 3, 0,            /* 0x97 */
1128                 {{0, 2},
1129                 {4, 4},
1130                 {7, 7},
1131                 {0, 0}
1132                 }
1133         },
1134         {0, 1, 2, 0,            /* 0x98 */
1135                 {{3, 4},
1136                 {7, 7},
1137                 {0, 0},
1138                 {0, 0}
1139                 }
1140         },
1141         {1, 1, 3, 0,            /* 0x99 */
1142                 {{0, 0},
1143                 {3, 4},
1144                 {7, 7},
1145                 {0, 0}
1146                 }
1147         },
1148         {0, 1, 3, 0,            /* 0x9a */
1149                 {{1, 1},
1150                 {3, 4},
1151                 {7, 7},
1152                 {0, 0}
1153                 }
1154         },
1155         {1, 1, 3, 0,            /* 0x9b */
1156                 {{0, 1},
1157                 {3, 4},
1158                 {7, 7},
1159                 {0, 0}
1160                 }
1161         },
1162         {0, 1, 2, 0,            /* 0x9c */
1163                 {{2, 4},
1164                 {7, 7},
1165                 {0, 0},
1166                 {0, 0}
1167                 }
1168         },
1169         {1, 1, 3, 0,            /* 0x9d */
1170                 {{0, 0},
1171                 {2, 4},
1172                 {7, 7},
1173                 {0, 0}
1174                 }
1175         },
1176         {0, 1, 2, 0,            /* 0x9e */
1177                 {{1, 4},
1178                 {7, 7},
1179                 {0, 0},
1180                 {0, 0}
1181                 }
1182         },
1183         {1, 1, 2, 0,            /* 0x9f */
1184                 {{0, 4},
1185                 {7, 7},
1186                 {0, 0},
1187                 {0, 0}
1188                 }
1189         },
1190         {0, 1, 2, 0,            /* 0xa0 */
1191                 {{5, 5},
1192                 {7, 7},
1193                 {0, 0},
1194                 {0, 0}
1195                 }
1196         },
1197         {1, 1, 3, 0,            /* 0xa1 */
1198                 {{0, 0},
1199                 {5, 5},
1200                 {7, 7},
1201                 {0, 0}
1202                 }
1203         },
1204         {0, 1, 3, 0,            /* 0xa2 */
1205                 {{1, 1},
1206                 {5, 5},
1207                 {7, 7},
1208                 {0, 0}
1209                 }
1210         },
1211         {1, 1, 3, 0,            /* 0xa3 */
1212                 {{0, 1},
1213                 {5, 5},
1214                 {7, 7},
1215                 {0, 0}
1216                 }
1217         },
1218         {0, 1, 3, 0,            /* 0xa4 */
1219                 {{2, 2},
1220                 {5, 5},
1221                 {7, 7},
1222                 {0, 0}
1223                 }
1224         },
1225         {1, 1, 4, 0,            /* 0xa5 */
1226                 {{0, 0},
1227                 {2, 2},
1228                 {5, 5},
1229                 {7, 7}
1230                 }
1231         },
1232         {0, 1, 3, 0,            /* 0xa6 */
1233                 {{1, 2},
1234                 {5, 5},
1235                 {7, 7},
1236                 {0, 0}
1237                 }
1238         },
1239         {1, 1, 3, 0,            /* 0xa7 */
1240                 {{0, 2},
1241                 {5, 5},
1242                 {7, 7},
1243                 {0, 0}
1244                 }
1245         },
1246         {0, 1, 3, 0,            /* 0xa8 */
1247                 {{3, 3},
1248                 {5, 5},
1249                 {7, 7},
1250                 {0, 0}
1251                 }
1252         },
1253         {1, 1, 4, 0,            /* 0xa9 */
1254                 {{0, 0},
1255                 {3, 3},
1256                 {5, 5},
1257                 {7, 7}
1258                 }
1259         },
1260         {0, 1, 4, 0,            /* 0xaa */
1261                 {{1, 1},
1262                 {3, 3},
1263                 {5, 5},
1264                 {7, 7}
1265                 }
1266         },
1267         {1, 1, 4, 0,            /* 0xab */
1268                 {{0, 1},
1269                 {3, 3},
1270                 {5, 5},
1271                 {7, 7}
1272                 }
1273         },
1274         {0, 1, 3, 0,            /* 0xac */
1275                 {{2, 3},
1276                 {5, 5},
1277                 {7, 7},
1278                 {0, 0}
1279                 }
1280         },
1281         {1, 1, 4, 0,            /* 0xad */
1282                 {{0, 0},
1283                 {2, 3},
1284                 {5, 5},
1285                 {7, 7}
1286                 }
1287         },
1288         {0, 1, 3, 0,            /* 0xae */
1289                 {{1, 3},
1290                 {5, 5},
1291                 {7, 7},
1292                 {0, 0}
1293                 }
1294         },
1295         {1, 1, 3, 0,            /* 0xaf */
1296                 {{0, 3},
1297                 {5, 5},
1298                 {7, 7},
1299                 {0, 0}
1300                 }
1301         },
1302         {0, 1, 2, 0,            /* 0xb0 */
1303                 {{4, 5},
1304                 {7, 7},
1305                 {0, 0},
1306                 {0, 0}
1307                 }
1308         },
1309         {1, 1, 3, 0,            /* 0xb1 */
1310                 {{0, 0},
1311                 {4, 5},
1312                 {7, 7},
1313                 {0, 0}
1314                 }
1315         },
1316         {0, 1, 3, 0,            /* 0xb2 */
1317                 {{1, 1},
1318                 {4, 5},
1319                 {7, 7},
1320                 {0, 0}
1321                 }
1322         },
1323         {1, 1, 3, 0,            /* 0xb3 */
1324                 {{0, 1},
1325                 {4, 5},
1326                 {7, 7},
1327                 {0, 0}
1328                 }
1329         },
1330         {0, 1, 3, 0,            /* 0xb4 */
1331                 {{2, 2},
1332                 {4, 5},
1333                 {7, 7},
1334                 {0, 0}
1335                 }
1336         },
1337         {1, 1, 4, 0,            /* 0xb5 */
1338                 {{0, 0},
1339                 {2, 2},
1340                 {4, 5},
1341                 {7, 7}
1342                 }
1343         },
1344         {0, 1, 3, 0,            /* 0xb6 */
1345                 {{1, 2},
1346                 {4, 5},
1347                 {7, 7},
1348                 {0, 0}
1349                 }
1350         },
1351         {1, 1, 3, 0,            /* 0xb7 */
1352                 {{0, 2},
1353                 {4, 5},
1354                 {7, 7},
1355                 {0, 0}
1356                 }
1357         },
1358         {0, 1, 2, 0,            /* 0xb8 */
1359                 {{3, 5},
1360                 {7, 7},
1361                 {0, 0},
1362                 {0, 0}
1363                 }
1364         },
1365         {1, 1, 3, 0,            /* 0xb9 */
1366                 {{0, 0},
1367                 {3, 5},
1368                 {7, 7},
1369                 {0, 0}
1370                 }
1371         },
1372         {0, 1, 3, 0,            /* 0xba */
1373                 {{1, 1},
1374                 {3, 5},
1375                 {7, 7},
1376                 {0, 0}
1377                 }
1378         },
1379         {1, 1, 3, 0,            /* 0xbb */
1380                 {{0, 1},
1381                 {3, 5},
1382                 {7, 7},
1383                 {0, 0}
1384                 }
1385         },
1386         {0, 1, 2, 0,            /* 0xbc */
1387                 {{2, 5},
1388                 {7, 7},
1389                 {0, 0},
1390                 {0, 0}
1391                 }
1392         },
1393         {1, 1, 3, 0,            /* 0xbd */
1394                 {{0, 0},
1395                 {2, 5},
1396                 {7, 7},
1397                 {0, 0}
1398                 }
1399         },
1400         {0, 1, 2, 0,            /* 0xbe */
1401                 {{1, 5},
1402                 {7, 7},
1403                 {0, 0},
1404                 {0, 0}
1405                 }
1406         },
1407         {1, 1, 2, 0,            /* 0xbf */
1408                 {{0, 5},
1409                 {7, 7},
1410                 {0, 0},
1411                 {0, 0}
1412                 }
1413         },
1414         {0, 1, 1, 0,            /* 0xc0 */
1415                 {{6, 7},
1416                 {0, 0},
1417                 {0, 0},
1418                 {0, 0}
1419                 }
1420         },
1421         {1, 1, 2, 0,            /* 0xc1 */
1422                 {{0, 0},
1423                 {6, 7},
1424                 {0, 0},
1425                 {0, 0}
1426                 }
1427         },
1428         {0, 1, 2, 0,            /* 0xc2 */
1429                 {{1, 1},
1430                 {6, 7},
1431                 {0, 0},
1432                 {0, 0}
1433                 }
1434         },
1435         {1, 1, 2, 0,            /* 0xc3 */
1436                 {{0, 1},
1437                 {6, 7},
1438                 {0, 0},
1439                 {0, 0}
1440                 }
1441         },
1442         {0, 1, 2, 0,            /* 0xc4 */
1443                 {{2, 2},
1444                 {6, 7},
1445                 {0, 0},
1446                 {0, 0}
1447                 }
1448         },
1449         {1, 1, 3, 0,            /* 0xc5 */
1450                 {{0, 0},
1451                 {2, 2},
1452                 {6, 7},
1453                 {0, 0}
1454                 }
1455         },
1456         {0, 1, 2, 0,            /* 0xc6 */
1457                 {{1, 2},
1458                 {6, 7},
1459                 {0, 0},
1460                 {0, 0}
1461                 }
1462         },
1463         {1, 1, 2, 0,            /* 0xc7 */
1464                 {{0, 2},
1465                 {6, 7},
1466                 {0, 0},
1467                 {0, 0}
1468                 }
1469         },
1470         {0, 1, 2, 0,            /* 0xc8 */
1471                 {{3, 3},
1472                 {6, 7},
1473                 {0, 0},
1474                 {0, 0}
1475                 }
1476         },
1477         {1, 1, 3, 0,            /* 0xc9 */
1478                 {{0, 0},
1479                 {3, 3},
1480                 {6, 7},
1481                 {0, 0}
1482                 }
1483         },
1484         {0, 1, 3, 0,            /* 0xca */
1485                 {{1, 1},
1486                 {3, 3},
1487                 {6, 7},
1488                 {0, 0}
1489                 }
1490         },
1491         {1, 1, 3, 0,            /* 0xcb */
1492                 {{0, 1},
1493                 {3, 3},
1494                 {6, 7},
1495                 {0, 0}
1496                 }
1497         },
1498         {0, 1, 2, 0,            /* 0xcc */
1499                 {{2, 3},
1500                 {6, 7},
1501                 {0, 0},
1502                 {0, 0}
1503                 }
1504         },
1505         {1, 1, 3, 0,            /* 0xcd */
1506                 {{0, 0},
1507                 {2, 3},
1508                 {6, 7},
1509                 {0, 0}
1510                 }
1511         },
1512         {0, 1, 2, 0,            /* 0xce */
1513                 {{1, 3},
1514                 {6, 7},
1515                 {0, 0},
1516                 {0, 0}
1517                 }
1518         },
1519         {1, 1, 2, 0,            /* 0xcf */
1520                 {{0, 3},
1521                 {6, 7},
1522                 {0, 0},
1523                 {0, 0}
1524                 }
1525         },
1526         {0, 1, 2, 0,            /* 0xd0 */
1527                 {{4, 4},
1528                 {6, 7},
1529                 {0, 0},
1530                 {0, 0}
1531                 }
1532         },
1533         {1, 1, 3, 0,            /* 0xd1 */
1534                 {{0, 0},
1535                 {4, 4},
1536                 {6, 7},
1537                 {0, 0}
1538                 }
1539         },
1540         {0, 1, 3, 0,            /* 0xd2 */
1541                 {{1, 1},
1542                 {4, 4},
1543                 {6, 7},
1544                 {0, 0}
1545                 }
1546         },
1547         {1, 1, 3, 0,            /* 0xd3 */
1548                 {{0, 1},
1549                 {4, 4},
1550                 {6, 7},
1551                 {0, 0}
1552                 }
1553         },
1554         {0, 1, 3, 0,            /* 0xd4 */
1555                 {{2, 2},
1556                 {4, 4},
1557                 {6, 7},
1558                 {0, 0}
1559                 }
1560         },
1561         {1, 1, 4, 0,            /* 0xd5 */
1562                 {{0, 0},
1563                 {2, 2},
1564                 {4, 4},
1565                 {6, 7}
1566                 }
1567         },
1568         {0, 1, 3, 0,            /* 0xd6 */
1569                 {{1, 2},
1570                 {4, 4},
1571                 {6, 7},
1572                 {0, 0}
1573                 }
1574         },
1575         {1, 1, 3, 0,            /* 0xd7 */
1576                 {{0, 2},
1577                 {4, 4},
1578                 {6, 7},
1579                 {0, 0}
1580                 }
1581         },
1582         {0, 1, 2, 0,            /* 0xd8 */
1583                 {{3, 4},
1584                 {6, 7},
1585                 {0, 0},
1586                 {0, 0}
1587                 }
1588         },
1589         {1, 1, 3, 0,            /* 0xd9 */
1590                 {{0, 0},
1591                 {3, 4},
1592                 {6, 7},
1593                 {0, 0}
1594                 }
1595         },
1596         {0, 1, 3, 0,            /* 0xda */
1597                 {{1, 1},
1598                 {3, 4},
1599                 {6, 7},
1600                 {0, 0}
1601                 }
1602         },
1603         {1, 1, 3, 0,            /* 0xdb */
1604                 {{0, 1},
1605                 {3, 4},
1606                 {6, 7},
1607                 {0, 0}
1608                 }
1609         },
1610         {0, 1, 2, 0,            /* 0xdc */
1611                 {{2, 4},
1612                 {6, 7},
1613                 {0, 0},
1614                 {0, 0}
1615                 }
1616         },
1617         {1, 1, 3, 0,            /* 0xdd */
1618                 {{0, 0},
1619                 {2, 4},
1620                 {6, 7},
1621                 {0, 0}
1622                 }
1623         },
1624         {0, 1, 2, 0,            /* 0xde */
1625                 {{1, 4},
1626                 {6, 7},
1627                 {0, 0},
1628                 {0, 0}
1629                 }
1630         },
1631         {1, 1, 2, 0,            /* 0xdf */
1632                 {{0, 4},
1633                 {6, 7},
1634                 {0, 0},
1635                 {0, 0}
1636                 }
1637         },
1638         {0, 1, 1, 0,            /* 0xe0 */
1639                 {{5, 7},
1640                 {0, 0},
1641                 {0, 0},
1642                 {0, 0}
1643                 }
1644         },
1645         {1, 1, 2, 0,            /* 0xe1 */
1646                 {{0, 0},
1647                 {5, 7},
1648                 {0, 0},
1649                 {0, 0}
1650                 }
1651         },
1652         {0, 1, 2, 0,            /* 0xe2 */
1653                 {{1, 1},
1654                 {5, 7},
1655                 {0, 0},
1656                 {0, 0}
1657                 }
1658         },
1659         {1, 1, 2, 0,            /* 0xe3 */
1660                 {{0, 1},
1661                 {5, 7},
1662                 {0, 0},
1663                 {0, 0}
1664                 }
1665         },
1666         {0, 1, 2, 0,            /* 0xe4 */
1667                 {{2, 2},
1668                 {5, 7},
1669                 {0, 0},
1670                 {0, 0}
1671                 }
1672         },
1673         {1, 1, 3, 0,            /* 0xe5 */
1674                 {{0, 0},
1675                 {2, 2},
1676                 {5, 7},
1677                 {0, 0}
1678                 }
1679         },
1680         {0, 1, 2, 0,            /* 0xe6 */
1681                 {{1, 2},
1682                 {5, 7},
1683                 {0, 0},
1684                 {0, 0}
1685                 }
1686         },
1687         {1, 1, 2, 0,            /* 0xe7 */
1688                 {{0, 2},
1689                 {5, 7},
1690                 {0, 0},
1691                 {0, 0}
1692                 }
1693         },
1694         {0, 1, 2, 0,            /* 0xe8 */
1695                 {{3, 3},
1696                 {5, 7},
1697                 {0, 0},
1698                 {0, 0}
1699                 }
1700         },
1701         {1, 1, 3, 0,            /* 0xe9 */
1702                 {{0, 0},
1703                 {3, 3},
1704                 {5, 7},
1705                 {0, 0}
1706                 }
1707         },
1708         {0, 1, 3, 0,            /* 0xea */
1709                 {{1, 1},
1710                 {3, 3},
1711                 {5, 7},
1712                 {0, 0}
1713                 }
1714         },
1715         {1, 1, 3, 0,            /* 0xeb */
1716                 {{0, 1},
1717                 {3, 3},
1718                 {5, 7},
1719                 {0, 0}
1720                 }
1721         },
1722         {0, 1, 2, 0,            /* 0xec */
1723                 {{2, 3},
1724                 {5, 7},
1725                 {0, 0},
1726                 {0, 0}
1727                 }
1728         },
1729         {1, 1, 3, 0,            /* 0xed */
1730                 {{0, 0},
1731                 {2, 3},
1732                 {5, 7},
1733                 {0, 0}
1734                 }
1735         },
1736         {0, 1, 2, 0,            /* 0xee */
1737                 {{1, 3},
1738                 {5, 7},
1739                 {0, 0},
1740                 {0, 0}
1741                 }
1742         },
1743         {1, 1, 2, 0,            /* 0xef */
1744                 {{0, 3},
1745                 {5, 7},
1746                 {0, 0},
1747                 {0, 0}
1748                 }
1749         },
1750         {0, 1, 1, 0,            /* 0xf0 */
1751                 {{4, 7},
1752                 {0, 0},
1753                 {0, 0},
1754                 {0, 0}
1755                 }
1756         },
1757         {1, 1, 2, 0,            /* 0xf1 */
1758                 {{0, 0},
1759                 {4, 7},
1760                 {0, 0},
1761                 {0, 0}
1762                 }
1763         },
1764         {0, 1, 2, 0,            /* 0xf2 */
1765                 {{1, 1},
1766                 {4, 7},
1767                 {0, 0},
1768                 {0, 0}
1769                 }
1770         },
1771         {1, 1, 2, 0,            /* 0xf3 */
1772                 {{0, 1},
1773                 {4, 7},
1774                 {0, 0},
1775                 {0, 0}
1776                 }
1777         },
1778         {0, 1, 2, 0,            /* 0xf4 */
1779                 {{2, 2},
1780                 {4, 7},
1781                 {0, 0},
1782                 {0, 0}
1783                 }
1784         },
1785         {1, 1, 3, 0,            /* 0xf5 */
1786                 {{0, 0},
1787                 {2, 2},
1788                 {4, 7},
1789                 {0, 0}
1790                 }
1791         },
1792         {0, 1, 2, 0,            /* 0xf6 */
1793                 {{1, 2},
1794                 {4, 7},
1795                 {0, 0},
1796                 {0, 0}
1797                 }
1798         },
1799         {1, 1, 2, 0,            /* 0xf7 */
1800                 {{0, 2},
1801                 {4, 7},
1802                 {0, 0},
1803                 {0, 0}
1804                 }
1805         },
1806         {0, 1, 1, 0,            /* 0xf8 */
1807                 {{3, 7},
1808                 {0, 0},
1809                 {0, 0},
1810                 {0, 0}
1811                 }
1812         },
1813         {1, 1, 2, 0,            /* 0xf9 */
1814                 {{0, 0},
1815                 {3, 7},
1816                 {0, 0},
1817                 {0, 0}
1818                 }
1819         },
1820         {0, 1, 2, 0,            /* 0xfa */
1821                 {{1, 1},
1822                 {3, 7},
1823                 {0, 0},
1824                 {0, 0}
1825                 }
1826         },
1827         {1, 1, 2, 0,            /* 0xfb */
1828                 {{0, 1},
1829                 {3, 7},
1830                 {0, 0},
1831                 {0, 0}
1832                 }
1833         },
1834         {0, 1, 1, 0,            /* 0xfc */
1835                 {{2, 7},
1836                 {0, 0},
1837                 {0, 0},
1838                 {0, 0}
1839                 }
1840         },
1841         {1, 1, 2, 0,            /* 0xfd */
1842                 {{0, 0},
1843                 {2, 7},
1844                 {0, 0},
1845                 {0, 0}
1846                 }
1847         },
1848         {0, 1, 1, 0,            /* 0xfe */
1849                 {{1, 7},
1850                 {0, 0},
1851                 {0, 0},
1852                 {0, 0}
1853                 }
1854         },
1855         {1, 1, 1, 0,            /* 0xff */
1856                 {{0, 7},
1857                 {0, 0},
1858                 {0, 0},
1859                 {0, 0}
1860                 }
1861         }
1862 };
1863
1864
1865 int
1866 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1867     int ipv4_addr_legal,
1868     int ipv6_addr_legal,
1869     int loopback_scope,
1870     int ipv4_local_scope,
1871     int local_scope,
1872     int site_scope,
1873     int do_update)
1874 {
1875         if ((loopback_scope == 0) &&
1876             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1877                 /*
1878                  * skip loopback if not in scope *
1879                  */
1880                 return (0);
1881         }
1882         switch (ifa->address.sa.sa_family) {
1883 #ifdef INET
1884         case AF_INET:
1885                 if (ipv4_addr_legal) {
1886                         struct sockaddr_in *sin;
1887
1888                         sin = (struct sockaddr_in *)&ifa->address.sin;
1889                         if (sin->sin_addr.s_addr == 0) {
1890                                 /* not in scope , unspecified */
1891                                 return (0);
1892                         }
1893                         if ((ipv4_local_scope == 0) &&
1894                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1895                                 /* private address not in scope */
1896                                 return (0);
1897                         }
1898                 } else {
1899                         return (0);
1900                 }
1901                 break;
1902 #endif
1903 #ifdef INET6
1904         case AF_INET6:
1905                 if (ipv6_addr_legal) {
1906                         struct sockaddr_in6 *sin6;
1907
1908                         /*
1909                          * Must update the flags,  bummer, which means any
1910                          * IFA locks must now be applied HERE <->
1911                          */
1912                         if (do_update) {
1913                                 sctp_gather_internal_ifa_flags(ifa);
1914                         }
1915                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1916                                 return (0);
1917                         }
1918                         /* ok to use deprecated addresses? */
1919                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1920                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1921                                 /* skip unspecifed addresses */
1922                                 return (0);
1923                         }
1924                         if (    /* (local_scope == 0) && */
1925                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                         if ((site_scope == 0) &&
1929                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1930                                 return (0);
1931                         }
1932                 } else {
1933                         return (0);
1934                 }
1935                 break;
1936 #endif
1937         default:
1938                 return (0);
1939         }
1940         return (1);
1941 }
1942
1943 static struct mbuf *
1944 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1945 {
1946         struct sctp_paramhdr *parmh;
1947         struct mbuf *mret;
1948         int len;
1949
1950         switch (ifa->address.sa.sa_family) {
1951 #ifdef INET
1952         case AF_INET:
1953                 len = sizeof(struct sctp_ipv4addr_param);
1954                 break;
1955 #endif
1956 #ifdef INET6
1957         case AF_INET6:
1958                 len = sizeof(struct sctp_ipv6addr_param);
1959                 break;
1960 #endif
1961         default:
1962                 return (m);
1963         }
1964         if (M_TRAILINGSPACE(m) >= len) {
1965                 /* easy side we just drop it on the end */
1966                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1967                 mret = m;
1968         } else {
1969                 /* Need more space */
1970                 mret = m;
1971                 while (SCTP_BUF_NEXT(mret) != NULL) {
1972                         mret = SCTP_BUF_NEXT(mret);
1973                 }
1974                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1975                 if (SCTP_BUF_NEXT(mret) == NULL) {
1976                         /* We are hosed, can't add more addresses */
1977                         return (m);
1978                 }
1979                 mret = SCTP_BUF_NEXT(mret);
1980                 parmh = mtod(mret, struct sctp_paramhdr *);
1981         }
1982         /* now add the parameter */
1983         switch (ifa->address.sa.sa_family) {
1984 #ifdef INET
1985         case AF_INET:
1986                 {
1987                         struct sctp_ipv4addr_param *ipv4p;
1988                         struct sockaddr_in *sin;
1989
1990                         sin = (struct sockaddr_in *)&ifa->address.sin;
1991                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1992                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1993                         parmh->param_length = htons(len);
1994                         ipv4p->addr = sin->sin_addr.s_addr;
1995                         SCTP_BUF_LEN(mret) += len;
1996                         break;
1997                 }
1998 #endif
1999 #ifdef INET6
2000         case AF_INET6:
2001                 {
2002                         struct sctp_ipv6addr_param *ipv6p;
2003                         struct sockaddr_in6 *sin6;
2004
2005                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2006                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2007                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2008                         parmh->param_length = htons(len);
2009                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2010                             sizeof(ipv6p->addr));
2011                         /* clear embedded scope in the address */
2012                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2013                         SCTP_BUF_LEN(mret) += len;
2014                         break;
2015                 }
2016 #endif
2017         default:
2018                 return (m);
2019         }
2020         return (mret);
2021 }
2022
2023
2024 struct mbuf *
2025 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2026     struct sctp_scoping *scope,
2027     struct mbuf *m_at, int cnt_inits_to)
2028 {
2029         struct sctp_vrf *vrf = NULL;
2030         int cnt, limit_out = 0, total_count;
2031         uint32_t vrf_id;
2032
2033         vrf_id = inp->def_vrf_id;
2034         SCTP_IPI_ADDR_RLOCK();
2035         vrf = sctp_find_vrf(vrf_id);
2036         if (vrf == NULL) {
2037                 SCTP_IPI_ADDR_RUNLOCK();
2038                 return (m_at);
2039         }
2040         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2041                 struct sctp_ifa *sctp_ifap;
2042                 struct sctp_ifn *sctp_ifnp;
2043
2044                 cnt = cnt_inits_to;
2045                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2046                         limit_out = 1;
2047                         cnt = SCTP_ADDRESS_LIMIT;
2048                         goto skip_count;
2049                 }
2050                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2051                         if ((scope->loopback_scope == 0) &&
2052                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2053                                 /*
2054                                  * Skip loopback devices if loopback_scope
2055                                  * not set
2056                                  */
2057                                 continue;
2058                         }
2059                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2060                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2061                                         continue;
2062                                 }
2063                                 if (sctp_is_address_in_scope(sctp_ifap,
2064                                     scope->ipv4_addr_legal,
2065                                     scope->ipv6_addr_legal,
2066                                     scope->loopback_scope,
2067                                     scope->ipv4_local_scope,
2068                                     scope->local_scope,
2069                                     scope->site_scope, 1) == 0) {
2070                                         continue;
2071                                 }
2072                                 cnt++;
2073                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2074                                         break;
2075                                 }
2076                         }
2077                         if (cnt > SCTP_ADDRESS_LIMIT) {
2078                                 break;
2079                         }
2080                 }
2081 skip_count:
2082                 if (cnt > 1) {
2083                         total_count = 0;
2084                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2085                                 cnt = 0;
2086                                 if ((scope->loopback_scope == 0) &&
2087                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2088                                         /*
2089                                          * Skip loopback devices if
2090                                          * loopback_scope not set
2091                                          */
2092                                         continue;
2093                                 }
2094                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2095                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2096                                                 continue;
2097                                         }
2098                                         if (sctp_is_address_in_scope(sctp_ifap,
2099                                             scope->ipv4_addr_legal,
2100                                             scope->ipv6_addr_legal,
2101                                             scope->loopback_scope,
2102                                             scope->ipv4_local_scope,
2103                                             scope->local_scope,
2104                                             scope->site_scope, 0) == 0) {
2105                                                 continue;
2106                                         }
2107                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
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->ipv4_addr_legal,
2150                             scope->ipv6_addr_legal,
2151                             scope->loopback_scope,
2152                             scope->ipv4_local_scope,
2153                             scope->local_scope,
2154                             scope->site_scope, 1) == 0) {
2155                                 continue;
2156                         }
2157                         cnt++;
2158                 }
2159                 if (cnt > SCTP_ADDRESS_LIMIT) {
2160                         limit_out = 1;
2161                 }
2162                 /*
2163                  * To get through a NAT we only list addresses if we have
2164                  * more than one. That way if you just bind a single address
2165                  * we let the source of the init dictate our address.
2166                  */
2167                 if (cnt > 1) {
2168                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2169                                 cnt = 0;
2170                                 if (laddr->ifa == NULL) {
2171                                         continue;
2172                                 }
2173                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2174                                         continue;
2175
2176                                 if (sctp_is_address_in_scope(laddr->ifa,
2177                                     scope->ipv4_addr_legal,
2178                                     scope->ipv6_addr_legal,
2179                                     scope->loopback_scope,
2180                                     scope->ipv4_local_scope,
2181                                     scope->local_scope,
2182                                     scope->site_scope, 0) == 0) {
2183                                         continue;
2184                                 }
2185                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2186                                 cnt++;
2187                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2188                                         break;
2189                                 }
2190                         }
2191                 }
2192         }
2193         SCTP_IPI_ADDR_RUNLOCK();
2194         return (m_at);
2195 }
2196
2197 static struct sctp_ifa *
2198 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2199     uint8_t dest_is_loop,
2200     uint8_t dest_is_priv,
2201     sa_family_t fam)
2202 {
2203         uint8_t dest_is_global = 0;
2204
2205         /* dest_is_priv is true if destination is a private address */
2206         /* dest_is_loop is true if destination is a loopback addresses */
2207
2208         /**
2209          * Here we determine if its a preferred address. A preferred address
2210          * means it is the same scope or higher scope then the destination.
2211          * L = loopback, P = private, G = global
2212          * -----------------------------------------
2213          *    src    |  dest | result
2214          *  ----------------------------------------
2215          *     L     |    L  |    yes
2216          *  -----------------------------------------
2217          *     P     |    L  |    yes-v4 no-v6
2218          *  -----------------------------------------
2219          *     G     |    L  |    yes-v4 no-v6
2220          *  -----------------------------------------
2221          *     L     |    P  |    no
2222          *  -----------------------------------------
2223          *     P     |    P  |    yes
2224          *  -----------------------------------------
2225          *     G     |    P  |    no
2226          *   -----------------------------------------
2227          *     L     |    G  |    no
2228          *   -----------------------------------------
2229          *     P     |    G  |    no
2230          *    -----------------------------------------
2231          *     G     |    G  |    yes
2232          *    -----------------------------------------
2233          */
2234
2235         if (ifa->address.sa.sa_family != fam) {
2236                 /* forget mis-matched family */
2237                 return (NULL);
2238         }
2239         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2240                 dest_is_global = 1;
2241         }
2242         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2243         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2244         /* Ok the address may be ok */
2245 #ifdef INET6
2246         if (fam == AF_INET6) {
2247                 /* ok to use deprecated addresses? no lets not! */
2248                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2249                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2250                         return (NULL);
2251                 }
2252                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2253                         if (dest_is_loop) {
2254                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2255                                 return (NULL);
2256                         }
2257                 }
2258                 if (ifa->src_is_glob) {
2259                         if (dest_is_loop) {
2260                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2261                                 return (NULL);
2262                         }
2263                 }
2264         }
2265 #endif
2266         /*
2267          * Now that we know what is what, implement or table this could in
2268          * theory be done slicker (it used to be), but this is
2269          * straightforward and easier to validate :-)
2270          */
2271         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2272             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2273         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2274             dest_is_loop, dest_is_priv, dest_is_global);
2275
2276         if ((ifa->src_is_loop) && (dest_is_priv)) {
2277                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2278                 return (NULL);
2279         }
2280         if ((ifa->src_is_glob) && (dest_is_priv)) {
2281                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2282                 return (NULL);
2283         }
2284         if ((ifa->src_is_loop) && (dest_is_global)) {
2285                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2286                 return (NULL);
2287         }
2288         if ((ifa->src_is_priv) && (dest_is_global)) {
2289                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2290                 return (NULL);
2291         }
2292         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2293         /* its a preferred address */
2294         return (ifa);
2295 }
2296
2297 static struct sctp_ifa *
2298 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2299     uint8_t dest_is_loop,
2300     uint8_t dest_is_priv,
2301     sa_family_t fam)
2302 {
2303         uint8_t dest_is_global = 0;
2304
2305         /**
2306          * Here we determine if its a acceptable address. A acceptable
2307          * address means it is the same scope or higher scope but we can
2308          * allow for NAT which means its ok to have a global dest and a
2309          * private src.
2310          *
2311          * L = loopback, P = private, G = global
2312          * -----------------------------------------
2313          *  src    |  dest | result
2314          * -----------------------------------------
2315          *   L     |   L   |    yes
2316          *  -----------------------------------------
2317          *   P     |   L   |    yes-v4 no-v6
2318          *  -----------------------------------------
2319          *   G     |   L   |    yes
2320          * -----------------------------------------
2321          *   L     |   P   |    no
2322          * -----------------------------------------
2323          *   P     |   P   |    yes
2324          * -----------------------------------------
2325          *   G     |   P   |    yes - May not work
2326          * -----------------------------------------
2327          *   L     |   G   |    no
2328          * -----------------------------------------
2329          *   P     |   G   |    yes - May not work
2330          * -----------------------------------------
2331          *   G     |   G   |    yes
2332          * -----------------------------------------
2333          */
2334
2335         if (ifa->address.sa.sa_family != fam) {
2336                 /* forget non matching family */
2337                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2338                     ifa->address.sa.sa_family, fam);
2339                 return (NULL);
2340         }
2341         /* Ok the address may be ok */
2342         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2343         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2344             dest_is_loop, dest_is_priv);
2345         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2346                 dest_is_global = 1;
2347         }
2348 #ifdef INET6
2349         if (fam == AF_INET6) {
2350                 /* ok to use deprecated addresses? */
2351                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2352                         return (NULL);
2353                 }
2354                 if (ifa->src_is_priv) {
2355                         /* Special case, linklocal to loop */
2356                         if (dest_is_loop)
2357                                 return (NULL);
2358                 }
2359         }
2360 #endif
2361         /*
2362          * Now that we know what is what, implement our table. This could in
2363          * theory be done slicker (it used to be), but this is
2364          * straightforward and easier to validate :-)
2365          */
2366         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2367             ifa->src_is_loop,
2368             dest_is_priv);
2369         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2370                 return (NULL);
2371         }
2372         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2373             ifa->src_is_loop,
2374             dest_is_global);
2375         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2376                 return (NULL);
2377         }
2378         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2379         /* its an acceptable address */
2380         return (ifa);
2381 }
2382
2383 int
2384 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2385 {
2386         struct sctp_laddr *laddr;
2387
2388         if (stcb == NULL) {
2389                 /* There are no restrictions, no TCB :-) */
2390                 return (0);
2391         }
2392         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2393                 if (laddr->ifa == NULL) {
2394                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2395                             __FUNCTION__);
2396                         continue;
2397                 }
2398                 if (laddr->ifa == ifa) {
2399                         /* Yes it is on the list */
2400                         return (1);
2401                 }
2402         }
2403         return (0);
2404 }
2405
2406
2407 int
2408 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2409 {
2410         struct sctp_laddr *laddr;
2411
2412         if (ifa == NULL)
2413                 return (0);
2414         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2415                 if (laddr->ifa == NULL) {
2416                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2417                             __FUNCTION__);
2418                         continue;
2419                 }
2420                 if ((laddr->ifa == ifa) && laddr->action == 0)
2421                         /* same pointer */
2422                         return (1);
2423         }
2424         return (0);
2425 }
2426
2427
2428
2429 static struct sctp_ifa *
2430 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2431     sctp_route_t * ro,
2432     uint32_t vrf_id,
2433     int non_asoc_addr_ok,
2434     uint8_t dest_is_priv,
2435     uint8_t dest_is_loop,
2436     sa_family_t fam)
2437 {
2438         struct sctp_laddr *laddr, *starting_point;
2439         void *ifn;
2440         int resettotop = 0;
2441         struct sctp_ifn *sctp_ifn;
2442         struct sctp_ifa *sctp_ifa, *sifa;
2443         struct sctp_vrf *vrf;
2444         uint32_t ifn_index;
2445
2446         vrf = sctp_find_vrf(vrf_id);
2447         if (vrf == NULL)
2448                 return (NULL);
2449
2450         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2451         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2452         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2453         /*
2454          * first question, is the ifn we will emit on in our list, if so, we
2455          * want such an address. Note that we first looked for a preferred
2456          * address.
2457          */
2458         if (sctp_ifn) {
2459                 /* is a preferred one on the interface we route out? */
2460                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2461                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2462                             (non_asoc_addr_ok == 0))
2463                                 continue;
2464                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2465                             dest_is_loop,
2466                             dest_is_priv, fam);
2467                         if (sifa == NULL)
2468                                 continue;
2469                         if (sctp_is_addr_in_ep(inp, sifa)) {
2470                                 atomic_add_int(&sifa->refcount, 1);
2471                                 return (sifa);
2472                         }
2473                 }
2474         }
2475         /*
2476          * ok, now we now need to find one on the list of the addresses. We
2477          * can't get one on the emitting interface so let's find first a
2478          * preferred one. If not that an acceptable one otherwise... we
2479          * return NULL.
2480          */
2481         starting_point = inp->next_addr_touse;
2482 once_again:
2483         if (inp->next_addr_touse == NULL) {
2484                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2485                 resettotop = 1;
2486         }
2487         for (laddr = inp->next_addr_touse; laddr;
2488             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2489                 if (laddr->ifa == NULL) {
2490                         /* address has been removed */
2491                         continue;
2492                 }
2493                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2494                         /* address is being deleted */
2495                         continue;
2496                 }
2497                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2498                     dest_is_priv, fam);
2499                 if (sifa == NULL)
2500                         continue;
2501                 atomic_add_int(&sifa->refcount, 1);
2502                 return (sifa);
2503         }
2504         if (resettotop == 0) {
2505                 inp->next_addr_touse = NULL;
2506                 goto once_again;
2507         }
2508         inp->next_addr_touse = starting_point;
2509         resettotop = 0;
2510 once_again_too:
2511         if (inp->next_addr_touse == NULL) {
2512                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2513                 resettotop = 1;
2514         }
2515         /* ok, what about an acceptable address in the inp */
2516         for (laddr = inp->next_addr_touse; laddr;
2517             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2518                 if (laddr->ifa == NULL) {
2519                         /* address has been removed */
2520                         continue;
2521                 }
2522                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2523                         /* address is being deleted */
2524                         continue;
2525                 }
2526                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2527                     dest_is_priv, fam);
2528                 if (sifa == NULL)
2529                         continue;
2530                 atomic_add_int(&sifa->refcount, 1);
2531                 return (sifa);
2532         }
2533         if (resettotop == 0) {
2534                 inp->next_addr_touse = NULL;
2535                 goto once_again_too;
2536         }
2537         /*
2538          * no address bound can be a source for the destination we are in
2539          * trouble
2540          */
2541         return (NULL);
2542 }
2543
2544
2545
2546 static struct sctp_ifa *
2547 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2548     struct sctp_tcb *stcb,
2549     struct sctp_nets *net,
2550     sctp_route_t * ro,
2551     uint32_t vrf_id,
2552     uint8_t dest_is_priv,
2553     uint8_t dest_is_loop,
2554     int non_asoc_addr_ok,
2555     sa_family_t fam)
2556 {
2557         struct sctp_laddr *laddr, *starting_point;
2558         void *ifn;
2559         struct sctp_ifn *sctp_ifn;
2560         struct sctp_ifa *sctp_ifa, *sifa;
2561         uint8_t start_at_beginning = 0;
2562         struct sctp_vrf *vrf;
2563         uint32_t ifn_index;
2564
2565         /*
2566          * first question, is the ifn we will emit on in our list, if so, we
2567          * want that one.
2568          */
2569         vrf = sctp_find_vrf(vrf_id);
2570         if (vrf == NULL)
2571                 return (NULL);
2572
2573         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2574         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2575         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2576
2577         /*
2578          * first question, is the ifn we will emit on in our list?  If so,
2579          * we want that one. First we look for a preferred. Second, we go
2580          * for an acceptable.
2581          */
2582         if (sctp_ifn) {
2583                 /* first try for a preferred address on the ep */
2584                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2585                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2586                                 continue;
2587                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2588                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2589                                 if (sifa == NULL)
2590                                         continue;
2591                                 if (((non_asoc_addr_ok == 0) &&
2592                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2593                                     (non_asoc_addr_ok &&
2594                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2595                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2596                                         /* on the no-no list */
2597                                         continue;
2598                                 }
2599                                 atomic_add_int(&sifa->refcount, 1);
2600                                 return (sifa);
2601                         }
2602                 }
2603                 /* next try for an acceptable address on the ep */
2604                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2605                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2606                                 continue;
2607                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2608                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2609                                 if (sifa == NULL)
2610                                         continue;
2611                                 if (((non_asoc_addr_ok == 0) &&
2612                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2613                                     (non_asoc_addr_ok &&
2614                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2615                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2616                                         /* on the no-no list */
2617                                         continue;
2618                                 }
2619                                 atomic_add_int(&sifa->refcount, 1);
2620                                 return (sifa);
2621                         }
2622                 }
2623
2624         }
2625         /*
2626          * if we can't find one like that then we must look at all addresses
2627          * bound to pick one at first preferable then secondly acceptable.
2628          */
2629         starting_point = stcb->asoc.last_used_address;
2630 sctp_from_the_top:
2631         if (stcb->asoc.last_used_address == NULL) {
2632                 start_at_beginning = 1;
2633                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2634         }
2635         /* search beginning with the last used address */
2636         for (laddr = stcb->asoc.last_used_address; laddr;
2637             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2638                 if (laddr->ifa == NULL) {
2639                         /* address has been removed */
2640                         continue;
2641                 }
2642                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2643                         /* address is being deleted */
2644                         continue;
2645                 }
2646                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2647                 if (sifa == NULL)
2648                         continue;
2649                 if (((non_asoc_addr_ok == 0) &&
2650                     (sctp_is_addr_restricted(stcb, sifa))) ||
2651                     (non_asoc_addr_ok &&
2652                     (sctp_is_addr_restricted(stcb, sifa)) &&
2653                     (!sctp_is_addr_pending(stcb, sifa)))) {
2654                         /* on the no-no list */
2655                         continue;
2656                 }
2657                 stcb->asoc.last_used_address = laddr;
2658                 atomic_add_int(&sifa->refcount, 1);
2659                 return (sifa);
2660         }
2661         if (start_at_beginning == 0) {
2662                 stcb->asoc.last_used_address = NULL;
2663                 goto sctp_from_the_top;
2664         }
2665         /* now try for any higher scope than the destination */
2666         stcb->asoc.last_used_address = starting_point;
2667         start_at_beginning = 0;
2668 sctp_from_the_top2:
2669         if (stcb->asoc.last_used_address == NULL) {
2670                 start_at_beginning = 1;
2671                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2672         }
2673         /* search beginning with the last used address */
2674         for (laddr = stcb->asoc.last_used_address; laddr;
2675             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2676                 if (laddr->ifa == NULL) {
2677                         /* address has been removed */
2678                         continue;
2679                 }
2680                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2681                         /* address is being deleted */
2682                         continue;
2683                 }
2684                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2685                     dest_is_priv, fam);
2686                 if (sifa == NULL)
2687                         continue;
2688                 if (((non_asoc_addr_ok == 0) &&
2689                     (sctp_is_addr_restricted(stcb, sifa))) ||
2690                     (non_asoc_addr_ok &&
2691                     (sctp_is_addr_restricted(stcb, sifa)) &&
2692                     (!sctp_is_addr_pending(stcb, sifa)))) {
2693                         /* on the no-no list */
2694                         continue;
2695                 }
2696                 stcb->asoc.last_used_address = laddr;
2697                 atomic_add_int(&sifa->refcount, 1);
2698                 return (sifa);
2699         }
2700         if (start_at_beginning == 0) {
2701                 stcb->asoc.last_used_address = NULL;
2702                 goto sctp_from_the_top2;
2703         }
2704         return (NULL);
2705 }
2706
2707 static struct sctp_ifa *
2708 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2709     struct sctp_tcb *stcb,
2710     int non_asoc_addr_ok,
2711     uint8_t dest_is_loop,
2712     uint8_t dest_is_priv,
2713     int addr_wanted,
2714     sa_family_t fam,
2715     sctp_route_t * ro
2716 )
2717 {
2718         struct sctp_ifa *ifa, *sifa;
2719         int num_eligible_addr = 0;
2720
2721 #ifdef INET6
2722         struct sockaddr_in6 sin6, lsa6;
2723
2724         if (fam == AF_INET6) {
2725                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2726                 (void)sa6_recoverscope(&sin6);
2727         }
2728 #endif                          /* INET6 */
2729         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2730                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2731                     (non_asoc_addr_ok == 0))
2732                         continue;
2733                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2734                     dest_is_priv, fam);
2735                 if (sifa == NULL)
2736                         continue;
2737 #ifdef INET6
2738                 if (fam == AF_INET6 &&
2739                     dest_is_loop &&
2740                     sifa->src_is_loop && sifa->src_is_priv) {
2741                         /*
2742                          * don't allow fe80::1 to be a src on loop ::1, we
2743                          * don't list it to the peer so we will get an
2744                          * abort.
2745                          */
2746                         continue;
2747                 }
2748                 if (fam == AF_INET6 &&
2749                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2750                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2751                         /*
2752                          * link-local <-> link-local must belong to the same
2753                          * scope.
2754                          */
2755                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2756                         (void)sa6_recoverscope(&lsa6);
2757                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2758                                 continue;
2759                         }
2760                 }
2761 #endif                          /* INET6 */
2762
2763                 /*
2764                  * Check if the IPv6 address matches to next-hop. In the
2765                  * mobile case, old IPv6 address may be not deleted from the
2766                  * interface. Then, the interface has previous and new
2767                  * addresses.  We should use one corresponding to the
2768                  * next-hop.  (by micchie)
2769                  */
2770 #ifdef INET6
2771                 if (stcb && fam == AF_INET6 &&
2772                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2773                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2774                             == 0) {
2775                                 continue;
2776                         }
2777                 }
2778 #endif
2779 #ifdef INET
2780                 /* Avoid topologically incorrect IPv4 address */
2781                 if (stcb && fam == AF_INET &&
2782                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2783                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2784                                 continue;
2785                         }
2786                 }
2787 #endif
2788                 if (stcb) {
2789                         if (sctp_is_address_in_scope(ifa,
2790                             stcb->asoc.ipv4_addr_legal,
2791                             stcb->asoc.ipv6_addr_legal,
2792                             stcb->asoc.loopback_scope,
2793                             stcb->asoc.ipv4_local_scope,
2794                             stcb->asoc.local_scope,
2795                             stcb->asoc.site_scope, 0) == 0) {
2796                                 continue;
2797                         }
2798                         if (((non_asoc_addr_ok == 0) &&
2799                             (sctp_is_addr_restricted(stcb, sifa))) ||
2800                             (non_asoc_addr_ok &&
2801                             (sctp_is_addr_restricted(stcb, sifa)) &&
2802                             (!sctp_is_addr_pending(stcb, sifa)))) {
2803                                 /*
2804                                  * It is restricted for some reason..
2805                                  * probably not yet added.
2806                                  */
2807                                 continue;
2808                         }
2809                 }
2810                 if (num_eligible_addr >= addr_wanted) {
2811                         return (sifa);
2812                 }
2813                 num_eligible_addr++;
2814         }
2815         return (NULL);
2816 }
2817
2818
2819 static int
2820 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2821     struct sctp_tcb *stcb,
2822     int non_asoc_addr_ok,
2823     uint8_t dest_is_loop,
2824     uint8_t dest_is_priv,
2825     sa_family_t fam)
2826 {
2827         struct sctp_ifa *ifa, *sifa;
2828         int num_eligible_addr = 0;
2829
2830         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2831                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2832                     (non_asoc_addr_ok == 0)) {
2833                         continue;
2834                 }
2835                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2836                     dest_is_priv, fam);
2837                 if (sifa == NULL) {
2838                         continue;
2839                 }
2840                 if (stcb) {
2841                         if (sctp_is_address_in_scope(ifa,
2842                             stcb->asoc.ipv4_addr_legal,
2843                             stcb->asoc.ipv6_addr_legal,
2844                             stcb->asoc.loopback_scope,
2845                             stcb->asoc.ipv4_local_scope,
2846                             stcb->asoc.local_scope,
2847                             stcb->asoc.site_scope, 0) == 0) {
2848                                 continue;
2849                         }
2850                         if (((non_asoc_addr_ok == 0) &&
2851                             (sctp_is_addr_restricted(stcb, sifa))) ||
2852                             (non_asoc_addr_ok &&
2853                             (sctp_is_addr_restricted(stcb, sifa)) &&
2854                             (!sctp_is_addr_pending(stcb, sifa)))) {
2855                                 /*
2856                                  * It is restricted for some reason..
2857                                  * probably not yet added.
2858                                  */
2859                                 continue;
2860                         }
2861                 }
2862                 num_eligible_addr++;
2863         }
2864         return (num_eligible_addr);
2865 }
2866
2867 static struct sctp_ifa *
2868 sctp_choose_boundall(struct sctp_inpcb *inp,
2869     struct sctp_tcb *stcb,
2870     struct sctp_nets *net,
2871     sctp_route_t * ro,
2872     uint32_t vrf_id,
2873     uint8_t dest_is_priv,
2874     uint8_t dest_is_loop,
2875     int non_asoc_addr_ok,
2876     sa_family_t fam)
2877 {
2878         int cur_addr_num = 0, num_preferred = 0;
2879         void *ifn;
2880         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2881         struct sctp_ifa *sctp_ifa, *sifa;
2882         uint32_t ifn_index;
2883         struct sctp_vrf *vrf;
2884
2885 #ifdef INET
2886         int retried = 0;
2887
2888 #endif
2889         /*-
2890          * For boundall we can use any address in the association.
2891          * If non_asoc_addr_ok is set we can use any address (at least in
2892          * theory). So we look for preferred addresses first. If we find one,
2893          * we use it. Otherwise we next try to get an address on the
2894          * interface, which we should be able to do (unless non_asoc_addr_ok
2895          * is false and we are routed out that way). In these cases where we
2896          * can't use the address of the interface we go through all the
2897          * ifn's looking for an address we can use and fill that in. Punting
2898          * means we send back address 0, which will probably cause problems
2899          * actually since then IP will fill in the address of the route ifn,
2900          * which means we probably already rejected it.. i.e. here comes an
2901          * abort :-<.
2902          */
2903         vrf = sctp_find_vrf(vrf_id);
2904         if (vrf == NULL)
2905                 return (NULL);
2906
2907         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2908         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2909         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2910         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2911         if (sctp_ifn == NULL) {
2912                 /* ?? We don't have this guy ?? */
2913                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2914                 goto bound_all_plan_b;
2915         }
2916         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2917             ifn_index, sctp_ifn->ifn_name);
2918
2919         if (net) {
2920                 cur_addr_num = net->indx_of_eligible_next_to_use;
2921         }
2922         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2923             stcb,
2924             non_asoc_addr_ok,
2925             dest_is_loop,
2926             dest_is_priv, fam);
2927         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2928             num_preferred, sctp_ifn->ifn_name);
2929         if (num_preferred == 0) {
2930                 /*
2931                  * no eligible addresses, we must use some other interface
2932                  * address if we can find one.
2933                  */
2934                 goto bound_all_plan_b;
2935         }
2936         /*
2937          * Ok we have num_eligible_addr set with how many we can use, this
2938          * may vary from call to call due to addresses being deprecated
2939          * etc..
2940          */
2941         if (cur_addr_num >= num_preferred) {
2942                 cur_addr_num = 0;
2943         }
2944         /*
2945          * select the nth address from the list (where cur_addr_num is the
2946          * nth) and 0 is the first one, 1 is the second one etc...
2947          */
2948         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2949
2950         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2951             dest_is_priv, cur_addr_num, fam, ro);
2952
2953         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2954         if (sctp_ifa) {
2955                 atomic_add_int(&sctp_ifa->refcount, 1);
2956                 if (net) {
2957                         /* save off where the next one we will want */
2958                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2959                 }
2960                 return (sctp_ifa);
2961         }
2962         /*
2963          * plan_b: Look at all interfaces and find a preferred address. If
2964          * no preferred fall through to plan_c.
2965          */
2966 bound_all_plan_b:
2967         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2968         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2969                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2970                     sctp_ifn->ifn_name);
2971                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2972                         /* wrong base scope */
2973                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2974                         continue;
2975                 }
2976                 if ((sctp_ifn == looked_at) && looked_at) {
2977                         /* already looked at this guy */
2978                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2979                         continue;
2980                 }
2981                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2982                     dest_is_loop, dest_is_priv, fam);
2983                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2984                     "Found ifn:%p %d preferred source addresses\n",
2985                     ifn, num_preferred);
2986                 if (num_preferred == 0) {
2987                         /* None on this interface. */
2988                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2989                         continue;
2990                 }
2991                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2992                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2993                     num_preferred, sctp_ifn, cur_addr_num);
2994
2995                 /*
2996                  * Ok we have num_eligible_addr set with how many we can
2997                  * use, this may vary from call to call due to addresses
2998                  * being deprecated etc..
2999                  */
3000                 if (cur_addr_num >= num_preferred) {
3001                         cur_addr_num = 0;
3002                 }
3003                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
3004                     dest_is_priv, cur_addr_num, fam, ro);
3005                 if (sifa == NULL)
3006                         continue;
3007                 if (net) {
3008                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3009                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3010                             cur_addr_num);
3011                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3012                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3013                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3014                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3015                 }
3016                 atomic_add_int(&sifa->refcount, 1);
3017                 return (sifa);
3018         }
3019 #ifdef INET
3020 again_with_private_addresses_allowed:
3021 #endif
3022         /* plan_c: do we have an acceptable address on the emit interface */
3023         sifa = NULL;
3024         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3025         if (emit_ifn == NULL) {
3026                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3027                 goto plan_d;
3028         }
3029         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3030                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", sctp_ifa);
3031                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3032                     (non_asoc_addr_ok == 0)) {
3033                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3034                         continue;
3035                 }
3036                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3037                     dest_is_priv, fam);
3038                 if (sifa == NULL) {
3039                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3040                         continue;
3041                 }
3042                 if (stcb) {
3043                         if (sctp_is_address_in_scope(sifa,
3044                             stcb->asoc.ipv4_addr_legal,
3045                             stcb->asoc.ipv6_addr_legal,
3046                             stcb->asoc.loopback_scope,
3047                             stcb->asoc.ipv4_local_scope,
3048                             stcb->asoc.local_scope,
3049                             stcb->asoc.site_scope, 0) == 0) {
3050                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3051                                 sifa = NULL;
3052                                 continue;
3053                         }
3054                         if (((non_asoc_addr_ok == 0) &&
3055                             (sctp_is_addr_restricted(stcb, sifa))) ||
3056                             (non_asoc_addr_ok &&
3057                             (sctp_is_addr_restricted(stcb, sifa)) &&
3058                             (!sctp_is_addr_pending(stcb, sifa)))) {
3059                                 /*
3060                                  * It is restricted for some reason..
3061                                  * probably not yet added.
3062                                  */
3063                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3064                                 sifa = NULL;
3065                                 continue;
3066                         }
3067                 } else {
3068                         printf("Stcb is null - no print\n");
3069                 }
3070                 atomic_add_int(&sifa->refcount, 1);
3071                 goto out;
3072         }
3073 plan_d:
3074         /*
3075          * plan_d: We are in trouble. No preferred address on the emit
3076          * interface. And not even a preferred address on all interfaces. Go
3077          * out and see if we can find an acceptable address somewhere
3078          * amongst all interfaces.
3079          */
3080         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", looked_at);
3081         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3082                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3083                         /* wrong base scope */
3084                         continue;
3085                 }
3086                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3087                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3088                             (non_asoc_addr_ok == 0))
3089                                 continue;
3090                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3091                             dest_is_loop,
3092                             dest_is_priv, fam);
3093                         if (sifa == NULL)
3094                                 continue;
3095                         if (stcb) {
3096                                 if (sctp_is_address_in_scope(sifa,
3097                                     stcb->asoc.ipv4_addr_legal,
3098                                     stcb->asoc.ipv6_addr_legal,
3099                                     stcb->asoc.loopback_scope,
3100                                     stcb->asoc.ipv4_local_scope,
3101                                     stcb->asoc.local_scope,
3102                                     stcb->asoc.site_scope, 0) == 0) {
3103                                         sifa = NULL;
3104                                         continue;
3105                                 }
3106                                 if (((non_asoc_addr_ok == 0) &&
3107                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3108                                     (non_asoc_addr_ok &&
3109                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3110                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3111                                         /*
3112                                          * It is restricted for some
3113                                          * reason.. probably not yet added.
3114                                          */
3115                                         sifa = NULL;
3116                                         continue;
3117                                 }
3118                         }
3119                         goto out;
3120                 }
3121         }
3122 #ifdef INET
3123         if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3124                 stcb->asoc.ipv4_local_scope = 1;
3125                 retried = 1;
3126                 goto again_with_private_addresses_allowed;
3127         } else if (retried == 1) {
3128                 stcb->asoc.ipv4_local_scope = 0;
3129         }
3130 #endif
3131 out:
3132 #ifdef INET
3133         if (sifa) {
3134                 if (retried == 1) {
3135                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3136                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3137                                         /* wrong base scope */
3138                                         continue;
3139                                 }
3140                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3141                                         struct sctp_ifa *tmp_sifa;
3142
3143                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3144                                             (non_asoc_addr_ok == 0))
3145                                                 continue;
3146                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3147                                             dest_is_loop,
3148                                             dest_is_priv, fam);
3149                                         if (tmp_sifa == NULL) {
3150                                                 continue;
3151                                         }
3152                                         if (tmp_sifa == sifa) {
3153                                                 continue;
3154                                         }
3155                                         if (stcb) {
3156                                                 if (sctp_is_address_in_scope(tmp_sifa,
3157                                                     stcb->asoc.ipv4_addr_legal,
3158                                                     stcb->asoc.ipv6_addr_legal,
3159                                                     stcb->asoc.loopback_scope,
3160                                                     stcb->asoc.ipv4_local_scope,
3161                                                     stcb->asoc.local_scope,
3162                                                     stcb->asoc.site_scope, 0) == 0) {
3163                                                         continue;
3164                                                 }
3165                                                 if (((non_asoc_addr_ok == 0) &&
3166                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3167                                                     (non_asoc_addr_ok &&
3168                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3169                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3170                                                         /*
3171                                                          * It is restricted
3172                                                          * for some reason..
3173                                                          * probably not yet
3174                                                          * added.
3175                                                          */
3176                                                         continue;
3177                                                 }
3178                                         }
3179                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3180                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3181                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3182                                         }
3183                                 }
3184                         }
3185                 }
3186                 atomic_add_int(&sifa->refcount, 1);
3187         }
3188 #endif
3189         return (sifa);
3190 }
3191
3192
3193
3194 /* tcb may be NULL */
3195 struct sctp_ifa *
3196 sctp_source_address_selection(struct sctp_inpcb *inp,
3197     struct sctp_tcb *stcb,
3198     sctp_route_t * ro,
3199     struct sctp_nets *net,
3200     int non_asoc_addr_ok, uint32_t vrf_id)
3201 {
3202         struct sctp_ifa *answer;
3203         uint8_t dest_is_priv, dest_is_loop;
3204         sa_family_t fam;
3205
3206 #ifdef INET
3207         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3208
3209 #endif
3210 #ifdef INET6
3211         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3212
3213 #endif
3214
3215         /**
3216          * Rules: - Find the route if needed, cache if I can. - Look at
3217          * interface address in route, Is it in the bound list. If so we
3218          * have the best source. - If not we must rotate amongst the
3219          * addresses.
3220          *
3221          * Cavets and issues
3222          *
3223          * Do we need to pay attention to scope. We can have a private address
3224          * or a global address we are sourcing or sending to. So if we draw
3225          * it out
3226          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3227          * For V4
3228          * ------------------------------------------
3229          *      source     *      dest  *  result
3230          * -----------------------------------------
3231          * <a>  Private    *    Global  *  NAT
3232          * -----------------------------------------
3233          * <b>  Private    *    Private *  No problem
3234          * -----------------------------------------
3235          * <c>  Global     *    Private *  Huh, How will this work?
3236          * -----------------------------------------
3237          * <d>  Global     *    Global  *  No Problem
3238          *------------------------------------------
3239          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3240          * For V6
3241          *------------------------------------------
3242          *      source     *      dest  *  result
3243          * -----------------------------------------
3244          * <a>  Linklocal  *    Global  *
3245          * -----------------------------------------
3246          * <b>  Linklocal  * Linklocal  *  No problem
3247          * -----------------------------------------
3248          * <c>  Global     * Linklocal  *  Huh, How will this work?
3249          * -----------------------------------------
3250          * <d>  Global     *    Global  *  No Problem
3251          *------------------------------------------
3252          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3253          *
3254          * And then we add to that what happens if there are multiple addresses
3255          * assigned to an interface. Remember the ifa on a ifn is a linked
3256          * list of addresses. So one interface can have more than one IP
3257          * address. What happens if we have both a private and a global
3258          * address? Do we then use context of destination to sort out which
3259          * one is best? And what about NAT's sending P->G may get you a NAT
3260          * translation, or should you select the G thats on the interface in
3261          * preference.
3262          *
3263          * Decisions:
3264          *
3265          * - count the number of addresses on the interface.
3266          * - if it is one, no problem except case <c>.
3267          *   For <a> we will assume a NAT out there.
3268          * - if there are more than one, then we need to worry about scope P
3269          *   or G. We should prefer G -> G and P -> P if possible.
3270          *   Then as a secondary fall back to mixed types G->P being a last
3271          *   ditch one.
3272          * - The above all works for bound all, but bound specific we need to
3273          *   use the same concept but instead only consider the bound
3274          *   addresses. If the bound set is NOT assigned to the interface then
3275          *   we must use rotation amongst the bound addresses..
3276          */
3277         if (ro->ro_rt == NULL) {
3278                 /*
3279                  * Need a route to cache.
3280                  */
3281                 SCTP_RTALLOC(ro, vrf_id);
3282         }
3283         if (ro->ro_rt == NULL) {
3284                 return (NULL);
3285         }
3286         fam = ro->ro_dst.sa_family;
3287         dest_is_priv = dest_is_loop = 0;
3288         /* Setup our scopes for the destination */
3289         switch (fam) {
3290 #ifdef INET
3291         case AF_INET:
3292                 /* Scope based on outbound address */
3293                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3294                         dest_is_loop = 1;
3295                         if (net != NULL) {
3296                                 /* mark it as local */
3297                                 net->addr_is_local = 1;
3298                         }
3299                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3300                         dest_is_priv = 1;
3301                 }
3302                 break;
3303 #endif
3304 #ifdef INET6
3305         case AF_INET6:
3306                 /* Scope based on outbound address */
3307                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3308                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3309                         /*
3310                          * If the address is a loopback address, which
3311                          * consists of "::1" OR "fe80::1%lo0", we are
3312                          * loopback scope. But we don't use dest_is_priv
3313                          * (link local addresses).
3314                          */
3315                         dest_is_loop = 1;
3316                         if (net != NULL) {
3317                                 /* mark it as local */
3318                                 net->addr_is_local = 1;
3319                         }
3320                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3321                         dest_is_priv = 1;
3322                 }
3323                 break;
3324 #endif
3325         }
3326         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3327         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3328         SCTP_IPI_ADDR_RLOCK();
3329         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3330                 /*
3331                  * Bound all case
3332                  */
3333                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3334                     dest_is_priv, dest_is_loop,
3335                     non_asoc_addr_ok, fam);
3336                 SCTP_IPI_ADDR_RUNLOCK();
3337                 return (answer);
3338         }
3339         /*
3340          * Subset bound case
3341          */
3342         if (stcb) {
3343                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3344                     vrf_id, dest_is_priv,
3345                     dest_is_loop,
3346                     non_asoc_addr_ok, fam);
3347         } else {
3348                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3349                     non_asoc_addr_ok,
3350                     dest_is_priv,
3351                     dest_is_loop, fam);
3352         }
3353         SCTP_IPI_ADDR_RUNLOCK();
3354         return (answer);
3355 }
3356
3357 static int
3358 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3359 {
3360         struct cmsghdr cmh;
3361         int tlen, at, found;
3362         struct sctp_sndinfo sndinfo;
3363         struct sctp_prinfo prinfo;
3364         struct sctp_authinfo authinfo;
3365
3366         tlen = SCTP_BUF_LEN(control);
3367         at = 0;
3368         found = 0;
3369         /*
3370          * Independent of how many mbufs, find the c_type inside the control
3371          * structure and copy out the data.
3372          */
3373         while (at < tlen) {
3374                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3375                         /* There is not enough room for one more. */
3376                         return (found);
3377                 }
3378                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3379                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3380                         /* We dont't have a complete CMSG header. */
3381                         return (found);
3382                 }
3383                 if (((int)cmh.cmsg_len + at) > tlen) {
3384                         /* We don't have the complete CMSG. */
3385                         return (found);
3386                 }
3387                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3388                     ((c_type == cmh.cmsg_type) ||
3389                     ((c_type == SCTP_SNDRCV) &&
3390                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3391                     (cmh.cmsg_type == SCTP_PRINFO) ||
3392                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3393                         if (c_type == cmh.cmsg_type) {
3394                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3395                                         return (found);
3396                                 }
3397                                 /* It is exactly what we want. Copy it out. */
3398                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), cpsize, (caddr_t)data);
3399                                 return (1);
3400                         } else {
3401                                 struct sctp_sndrcvinfo *sndrcvinfo;
3402
3403                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3404                                 if (found == 0) {
3405                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3406                                                 return (found);
3407                                         }
3408                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3409                                 }
3410                                 switch (cmh.cmsg_type) {
3411                                 case SCTP_SNDINFO:
3412                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_sndinfo)) {
3413                                                 return (found);
3414                                         }
3415                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3416                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3417                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3418                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3419                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3420                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3421                                         break;
3422                                 case SCTP_PRINFO:
3423                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_prinfo)) {
3424                                                 return (found);
3425                                         }
3426                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3427                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3428                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3429                                         break;
3430                                 case SCTP_AUTHINFO:
3431                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_authinfo)) {
3432                                                 return (found);
3433                                         }
3434                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3435                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3436                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keyid;
3437                                         break;
3438                                 default:
3439                                         return (found);
3440                                 }
3441                                 found = 1;
3442                         }
3443                 }
3444                 at += CMSG_ALIGN(cmh.cmsg_len);
3445         }
3446         return (found);
3447 }
3448
3449 static int
3450 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3451 {
3452         struct cmsghdr cmh;
3453         int tlen, at;
3454         struct sctp_initmsg initmsg;
3455
3456 #ifdef INET
3457         struct sockaddr_in sin;
3458
3459 #endif
3460 #ifdef INET6
3461         struct sockaddr_in6 sin6;
3462
3463 #endif
3464
3465         tlen = SCTP_BUF_LEN(control);
3466         at = 0;
3467         while (at < tlen) {
3468                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3469                         /* There is not enough room for one more. */
3470                         *error = EINVAL;
3471                         return (1);
3472                 }
3473                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3474                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3475                         /* We dont't have a complete CMSG header. */
3476                         *error = EINVAL;
3477                         return (1);
3478                 }
3479                 if (((int)cmh.cmsg_len + at) > tlen) {
3480                         /* We don't have the complete CMSG. */
3481                         *error = EINVAL;
3482                         return (1);
3483                 }
3484                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3485                         switch (cmh.cmsg_type) {
3486                         case SCTP_INIT:
3487                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_initmsg)) {
3488                                         *error = EINVAL;
3489                                         return (1);
3490                                 }
3491                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3492                                 if (initmsg.sinit_max_attempts)
3493                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3494                                 if (initmsg.sinit_num_ostreams)
3495                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3496                                 if (initmsg.sinit_max_instreams)
3497                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3498                                 if (initmsg.sinit_max_init_timeo)
3499                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3500                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3501                                         struct sctp_stream_out *tmp_str;
3502                                         unsigned int i;
3503
3504                                         /* Default is NOT correct */
3505                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3506                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3507                                         SCTP_TCB_UNLOCK(stcb);
3508                                         SCTP_MALLOC(tmp_str,
3509                                             struct sctp_stream_out *,
3510                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3511                                             SCTP_M_STRMO);
3512                                         SCTP_TCB_LOCK(stcb);
3513                                         if (tmp_str != NULL) {
3514                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3515                                                 stcb->asoc.strmout = tmp_str;
3516                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3517                                         } else {
3518                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3519                                         }
3520                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3521                                                 stcb->asoc.strmout[i].next_sequence_sent = 0;
3522                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3523                                                 stcb->asoc.strmout[i].stream_no = i;
3524                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3525                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3526                                         }
3527                                 }
3528                                 break;
3529 #ifdef INET
3530                         case SCTP_DSTADDRV4:
3531                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3532                                         *error = EINVAL;
3533                                         return (1);
3534                                 }
3535                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3536                                 sin.sin_family = AF_INET;
3537                                 sin.sin_len = sizeof(struct sockaddr_in);
3538                                 sin.sin_port = stcb->rport;
3539                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3540                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3541                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3542                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3543                                         *error = EINVAL;
3544                                         return (-1);
3545                                 }
3546                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3547                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3548                                         *error = ENOBUFS;
3549                                         return (1);
3550                                 }
3551                                 break;
3552 #endif
3553 #ifdef INET6
3554                         case SCTP_DSTADDRV6:
3555                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3556                                         *error = EINVAL;
3557                                         return (1);
3558                                 }
3559                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3560                                 sin6.sin6_family = AF_INET6;
3561                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3562                                 sin6.sin6_port = stcb->rport;
3563                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3564                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3565                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3566                                         *error = EINVAL;
3567                                         return (-1);
3568                                 }
3569 #ifdef INET
3570                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3571                                         in6_sin6_2_sin(&sin, &sin6);
3572                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3573                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3574                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3575                                                 *error = EINVAL;
3576                                                 return (-1);
3577                                         }
3578                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3579                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3580                                                 *error = ENOBUFS;
3581                                                 return (1);
3582                                         }
3583                                 } else
3584 #endif
3585                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3586                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3587                                         *error = ENOBUFS;
3588                                         return (1);
3589                                 }
3590                                 break;
3591 #endif
3592                         default:
3593                                 break;
3594                         }
3595                 }
3596                 at += CMSG_ALIGN(cmh.cmsg_len);
3597         }
3598         return (0);
3599 }
3600
3601 static struct sctp_tcb *
3602 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3603     in_port_t port,
3604     struct mbuf *control,
3605     struct sctp_nets **net_p,
3606     int *error)
3607 {
3608         struct cmsghdr cmh;
3609         int tlen, at;
3610         struct sctp_tcb *stcb;
3611         struct sockaddr *addr;
3612
3613 #ifdef INET
3614         struct sockaddr_in sin;
3615
3616 #endif
3617 #ifdef INET6
3618         struct sockaddr_in6 sin6;
3619
3620 #endif
3621
3622         tlen = SCTP_BUF_LEN(control);
3623         at = 0;
3624         while (at < tlen) {
3625                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3626                         /* There is not enough room for one more. */
3627                         *error = EINVAL;
3628                         return (NULL);
3629                 }
3630                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3631                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3632                         /* We dont't have a complete CMSG header. */
3633                         *error = EINVAL;
3634                         return (NULL);
3635                 }
3636                 if (((int)cmh.cmsg_len + at) > tlen) {
3637                         /* We don't have the complete CMSG. */
3638                         *error = EINVAL;
3639                         return (NULL);
3640                 }
3641                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3642                         switch (cmh.cmsg_type) {
3643 #ifdef INET
3644                         case SCTP_DSTADDRV4:
3645                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3646                                         *error = EINVAL;
3647                                         return (NULL);
3648                                 }
3649                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3650                                 sin.sin_family = AF_INET;
3651                                 sin.sin_len = sizeof(struct sockaddr_in);
3652                                 sin.sin_port = port;
3653                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3654                                 addr = (struct sockaddr *)&sin;
3655                                 break;
3656 #endif
3657 #ifdef INET6
3658                         case SCTP_DSTADDRV6:
3659                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3660                                         *error = EINVAL;
3661                                         return (NULL);
3662                                 }
3663                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3664                                 sin6.sin6_family = AF_INET6;
3665                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3666                                 sin6.sin6_port = port;
3667                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3668 #ifdef INET
3669                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3670                                         in6_sin6_2_sin(&sin, &sin6);
3671                                         addr = (struct sockaddr *)&sin;
3672                                 } else
3673 #endif
3674                                         addr = (struct sockaddr *)&sin6;
3675                                 break;
3676 #endif
3677                         default:
3678                                 addr = NULL;
3679                                 break;
3680                         }
3681                         if (addr) {
3682                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3683                                 if (stcb != NULL) {
3684                                         return (stcb);
3685                                 }
3686                         }
3687                 }
3688                 at += CMSG_ALIGN(cmh.cmsg_len);
3689         }
3690         return (NULL);
3691 }
3692
3693 static struct mbuf *
3694 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3695     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3696 {
3697         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3698         struct sctp_state_cookie *stc;
3699         struct sctp_paramhdr *ph;
3700         uint8_t *foo;
3701         int sig_offset;
3702         uint16_t cookie_sz;
3703
3704         mret = NULL;
3705         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3706             sizeof(struct sctp_paramhdr)), 0,
3707             M_DONTWAIT, 1, MT_DATA);
3708         if (mret == NULL) {
3709                 return (NULL);
3710         }
3711         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3712         if (copy_init == NULL) {
3713                 sctp_m_freem(mret);
3714                 return (NULL);
3715         }
3716 #ifdef SCTP_MBUF_LOGGING
3717         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3718                 struct mbuf *mat;
3719
3720                 mat = copy_init;
3721                 while (mat) {
3722                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3723                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3724                         }
3725                         mat = SCTP_BUF_NEXT(mat);
3726                 }
3727         }
3728 #endif
3729         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3730             M_DONTWAIT);
3731         if (copy_initack == NULL) {
3732                 sctp_m_freem(mret);
3733                 sctp_m_freem(copy_init);
3734                 return (NULL);
3735         }
3736 #ifdef SCTP_MBUF_LOGGING
3737         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3738                 struct mbuf *mat;
3739
3740                 mat = copy_initack;
3741                 while (mat) {
3742                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3743                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3744                         }
3745                         mat = SCTP_BUF_NEXT(mat);
3746                 }
3747         }
3748 #endif
3749         /* easy side we just drop it on the end */
3750         ph = mtod(mret, struct sctp_paramhdr *);
3751         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3752             sizeof(struct sctp_paramhdr);
3753         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3754             sizeof(struct sctp_paramhdr));
3755         ph->param_type = htons(SCTP_STATE_COOKIE);
3756         ph->param_length = 0;   /* fill in at the end */
3757         /* Fill in the stc cookie data */
3758         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3759
3760         /* tack the INIT and then the INIT-ACK onto the chain */
3761         cookie_sz = 0;
3762         m_at = mret;
3763         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3764                 cookie_sz += SCTP_BUF_LEN(m_at);
3765                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3766                         SCTP_BUF_NEXT(m_at) = copy_init;
3767                         break;
3768                 }
3769         }
3770
3771         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3772                 cookie_sz += SCTP_BUF_LEN(m_at);
3773                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3774                         SCTP_BUF_NEXT(m_at) = copy_initack;
3775                         break;
3776                 }
3777         }
3778
3779         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3780                 cookie_sz += SCTP_BUF_LEN(m_at);
3781                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3782                         break;
3783                 }
3784         }
3785         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3786         if (sig == NULL) {
3787                 /* no space, so free the entire chain */
3788                 sctp_m_freem(mret);
3789                 return (NULL);
3790         }
3791         SCTP_BUF_LEN(sig) = 0;
3792         SCTP_BUF_NEXT(m_at) = sig;
3793         sig_offset = 0;
3794         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3795         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3796         *signature = foo;
3797         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3798         cookie_sz += SCTP_SIGNATURE_SIZE;
3799         ph->param_length = htons(cookie_sz);
3800         return (mret);
3801 }
3802
3803
3804 static uint8_t
3805 sctp_get_ect(struct sctp_tcb *stcb,
3806     struct sctp_tmit_chunk *chk)
3807 {
3808         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3809                 return (SCTP_ECT0_BIT);
3810         } else {
3811                 return (0);
3812         }
3813 }
3814
3815 static void
3816 sctp_handle_no_route(struct sctp_tcb *stcb,
3817     struct sctp_nets *net,
3818     int so_locked)
3819 {
3820         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3821
3822         if (net) {
3823                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3824                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3825                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3826                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3827                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3828                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3829                                     stcb,
3830                                     SCTP_FAILED_THRESHOLD,
3831                                     (void *)net,
3832                                     so_locked);
3833                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3834                                 net->dest_state &= ~SCTP_ADDR_PF;
3835                         }
3836                 }
3837                 if (stcb) {
3838                         if (net == stcb->asoc.primary_destination) {
3839                                 /* need a new primary */
3840                                 struct sctp_nets *alt;
3841
3842                                 alt = sctp_find_alternate_net(stcb, net, 0);
3843                                 if (alt != net) {
3844                                         if (stcb->asoc.alternate) {
3845                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3846                                         }
3847                                         stcb->asoc.alternate = alt;
3848                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3849                                         if (net->ro._s_addr) {
3850                                                 sctp_free_ifa(net->ro._s_addr);
3851                                                 net->ro._s_addr = NULL;
3852                                         }
3853                                         net->src_addr_selected = 0;
3854                                 }
3855                         }
3856                 }
3857         }
3858 }
3859
3860 static int
3861 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3862     struct sctp_tcb *stcb,      /* may be NULL */
3863     struct sctp_nets *net,
3864     struct sockaddr *to,
3865     struct mbuf *m,
3866     uint32_t auth_offset,
3867     struct sctp_auth_chunk *auth,
3868     uint16_t auth_keyid,
3869     int nofragment_flag,
3870     int ecn_ok,
3871     struct sctp_tmit_chunk *chk,
3872     int out_of_asoc_ok,
3873     uint16_t src_port,
3874     uint16_t dest_port,
3875     uint32_t v_tag,
3876     uint16_t port,
3877     int so_locked,
3878 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3879     SCTP_UNUSED
3880 #endif
3881     union sctp_sockstore *over_addr,
3882     struct mbuf *init
3883 )
3884 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3885 {
3886         /**
3887          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3888          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3889          * - fill in the HMAC digest of any AUTH chunk in the packet.
3890          * - calculate and fill in the SCTP checksum.
3891          * - prepend an IP address header.
3892          * - if boundall use INADDR_ANY.
3893          * - if boundspecific do source address selection.
3894          * - set fragmentation option for ipV4.
3895          * - On return from IP output, check/adjust mtu size of output
3896          *   interface and smallest_mtu size as well.
3897          */
3898         /* Will need ifdefs around this */
3899         struct mbuf *o_pak;
3900         struct mbuf *newm;
3901         struct sctphdr *sctphdr;
3902         int packet_length;
3903         int ret;
3904         uint32_t vrf_id;
3905         sctp_route_t *ro = NULL;
3906         struct udphdr *udp = NULL;
3907
3908 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3909         struct socket *so = NULL;
3910
3911 #endif
3912
3913         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3914                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3915                 sctp_m_freem(m);
3916                 return (EFAULT);
3917         }
3918         if (stcb) {
3919                 vrf_id = stcb->asoc.vrf_id;
3920         } else {
3921                 vrf_id = inp->def_vrf_id;
3922         }
3923
3924         /* fill in the HMAC digest for any AUTH chunk in the packet */
3925         if ((auth != NULL) && (stcb != NULL)) {
3926                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3927         }
3928         switch (to->sa_family) {
3929 #ifdef INET
3930         case AF_INET:
3931                 {
3932                         struct ip *ip = NULL;
3933                         sctp_route_t iproute;
3934                         uint8_t tos_value;
3935                         int len;
3936
3937                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3938                         if (port) {
3939                                 len += sizeof(struct udphdr);
3940                         }
3941                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3942                         if (newm == NULL) {
3943                                 sctp_m_freem(m);
3944                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3945                                 return (ENOMEM);
3946                         }
3947                         SCTP_ALIGN_TO_END(newm, len);
3948                         SCTP_BUF_LEN(newm) = len;
3949                         SCTP_BUF_NEXT(newm) = m;
3950                         m = newm;
3951                         if (net != NULL) {
3952 #ifdef INVARIANTS
3953                                 if (net->flowidset == 0) {
3954                                         panic("Flow ID not set");
3955                                 }
3956 #endif
3957                                 m->m_pkthdr.flowid = net->flowid;
3958                                 m->m_flags |= M_FLOWID;
3959                         } else {
3960                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
3961                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
3962                                         m->m_flags |= M_FLOWID;
3963                                 }
3964                         }
3965                         packet_length = sctp_calculate_len(m);
3966                         ip = mtod(m, struct ip *);
3967                         ip->ip_v = IPVERSION;
3968                         ip->ip_hl = (sizeof(struct ip) >> 2);
3969                         if (net) {
3970                                 tos_value = net->dscp;
3971                         } else {
3972                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3973                         }
3974                         if ((nofragment_flag) && (port == 0)) {
3975                                 ip->ip_off = IP_DF;
3976                         } else
3977                                 ip->ip_off = 0;
3978
3979                         /* FreeBSD has a function for ip_id's */
3980                         ip->ip_id = ip_newid();
3981
3982                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3983                         ip->ip_len = packet_length;
3984                         ip->ip_tos = tos_value & 0xfc;
3985                         if (ecn_ok) {
3986                                 ip->ip_tos |= sctp_get_ect(stcb, chk);
3987                         }
3988                         if (port) {
3989                                 ip->ip_p = IPPROTO_UDP;
3990                         } else {
3991                                 ip->ip_p = IPPROTO_SCTP;
3992                         }
3993                         ip->ip_sum = 0;
3994                         if (net == NULL) {
3995                                 ro = &iproute;
3996                                 memset(&iproute, 0, sizeof(iproute));
3997                                 memcpy(&ro->ro_dst, to, to->sa_len);
3998                         } else {
3999                                 ro = (sctp_route_t *) & net->ro;
4000                         }
4001                         /* Now the address selection part */
4002                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4003
4004                         /* call the routine to select the src address */
4005                         if (net && out_of_asoc_ok == 0) {
4006                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4007                                         sctp_free_ifa(net->ro._s_addr);
4008                                         net->ro._s_addr = NULL;
4009                                         net->src_addr_selected = 0;
4010                                         if (ro->ro_rt) {
4011                                                 RTFREE(ro->ro_rt);
4012                                                 ro->ro_rt = NULL;
4013                                         }
4014                                 }
4015                                 if (net->src_addr_selected == 0) {
4016                                         /* Cache the source address */
4017                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4018                                             ro, net, 0,
4019                                             vrf_id);
4020                                         net->src_addr_selected = 1;
4021                                 }
4022                                 if (net->ro._s_addr == NULL) {
4023                                         /* No route to host */
4024                                         net->src_addr_selected = 0;
4025                                         sctp_handle_no_route(stcb, net, so_locked);
4026                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4027                                         sctp_m_freem(m);
4028                                         return (EHOSTUNREACH);
4029                                 }
4030                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4031                         } else {
4032                                 if (over_addr == NULL) {
4033                                         struct sctp_ifa *_lsrc;
4034
4035                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4036                                             net,
4037                                             out_of_asoc_ok,
4038                                             vrf_id);
4039                                         if (_lsrc == NULL) {
4040                                                 sctp_handle_no_route(stcb, net, so_locked);
4041                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4042                                                 sctp_m_freem(m);
4043                                                 return (EHOSTUNREACH);
4044                                         }
4045                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4046                                         sctp_free_ifa(_lsrc);
4047                                 } else {
4048                                         ip->ip_src = over_addr->sin.sin_addr;
4049                                         SCTP_RTALLOC(ro, vrf_id);
4050                                 }
4051                         }
4052                         if (port) {
4053                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4054                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4055                                 udp->uh_dport = port;
4056                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4057                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4058                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4059                         } else {
4060                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4061                         }
4062
4063                         sctphdr->src_port = src_port;
4064                         sctphdr->dest_port = dest_port;
4065                         sctphdr->v_tag = v_tag;
4066                         sctphdr->checksum = 0;
4067
4068                         /*
4069                          * If source address selection fails and we find no
4070                          * route then the ip_output should fail as well with
4071                          * a NO_ROUTE_TO_HOST type error. We probably should
4072                          * catch that somewhere and abort the association
4073                          * right away (assuming this is an INIT being sent).
4074                          */
4075                         if (ro->ro_rt == NULL) {
4076                                 /*
4077                                  * src addr selection failed to find a route
4078                                  * (or valid source addr), so we can't get
4079                                  * there from here (yet)!
4080                                  */
4081                                 sctp_handle_no_route(stcb, net, so_locked);
4082                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4083                                 sctp_m_freem(m);
4084                                 return (EHOSTUNREACH);
4085                         }
4086                         if (ro != &iproute) {
4087                                 memcpy(&iproute, ro, sizeof(*ro));
4088                         }
4089                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4090                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4091                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4092                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4093                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4094                             ro->ro_rt);
4095
4096                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4097                                 /* failed to prepend data, give up */
4098                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4099                                 sctp_m_freem(m);
4100                                 return (ENOMEM);
4101                         }
4102 #ifdef  SCTP_PACKET_LOGGING
4103                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4104                                 sctp_packet_log(m, packet_length);
4105 #endif
4106                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4107                         if (port) {
4108 #if defined(SCTP_WITH_NO_CSUM)
4109                                 SCTP_STAT_INCR(sctps_sendnocrc);
4110 #else
4111                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4112                                     (stcb) &&
4113                                     (stcb->asoc.loopback_scope))) {
4114                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4115                                         SCTP_STAT_INCR(sctps_sendswcrc);
4116                                 } else {
4117                                         SCTP_STAT_INCR(sctps_sendnocrc);
4118                                 }
4119 #endif
4120                                 SCTP_ENABLE_UDP_CSUM(o_pak);
4121                         } else {
4122 #if defined(SCTP_WITH_NO_CSUM)
4123                                 SCTP_STAT_INCR(sctps_sendnocrc);
4124 #else
4125                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4126                                 m->m_pkthdr.csum_data = 0;
4127                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4128 #endif
4129                         }
4130                         /* send it out.  table id is taken from stcb */
4131 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4132                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4133                                 so = SCTP_INP_SO(inp);
4134                                 SCTP_SOCKET_UNLOCK(so, 0);
4135                         }
4136 #endif
4137                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4138 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4139                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4140                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4141                                 SCTP_TCB_UNLOCK(stcb);
4142                                 SCTP_SOCKET_LOCK(so, 0);
4143                                 SCTP_TCB_LOCK(stcb);
4144                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4145                         }
4146 #endif
4147                         SCTP_STAT_INCR(sctps_sendpackets);
4148                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4149                         if (ret)
4150                                 SCTP_STAT_INCR(sctps_senderrors);
4151
4152                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4153                         if (net == NULL) {
4154                                 /* free tempy routes */
4155                                 if (ro->ro_rt) {
4156                                         RTFREE(ro->ro_rt);
4157                                         ro->ro_rt = NULL;
4158                                 }
4159                         } else {
4160                                 /*
4161                                  * PMTU check versus smallest asoc MTU goes
4162                                  * here
4163                                  */
4164                                 if ((ro->ro_rt != NULL) &&
4165                                     (net->ro._s_addr)) {
4166                                         uint32_t mtu;
4167
4168                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4169                                         if (net->port) {
4170                                                 mtu -= sizeof(struct udphdr);
4171                                         }
4172                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4173                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4174                                                 net->mtu = mtu;
4175                                         }
4176                                 } else if (ro->ro_rt == NULL) {
4177                                         /* route was freed */
4178                                         if (net->ro._s_addr &&
4179                                             net->src_addr_selected) {
4180                                                 sctp_free_ifa(net->ro._s_addr);
4181                                                 net->ro._s_addr = NULL;
4182                                         }
4183                                         net->src_addr_selected = 0;
4184                                 }
4185                         }
4186                         return (ret);
4187                 }
4188 #endif
4189 #ifdef INET6
4190         case AF_INET6:
4191                 {
4192                         uint32_t flowlabel;
4193                         struct ip6_hdr *ip6h;
4194                         struct route_in6 ip6route;
4195                         struct ifnet *ifp;
4196                         u_char flowTop;
4197                         uint16_t flowBottom;
4198                         u_char tosBottom, tosTop;
4199                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4200                         int prev_scope = 0;
4201                         struct sockaddr_in6 lsa6_storage;
4202                         int error;
4203                         u_short prev_port = 0;
4204                         int len;
4205
4206                         if (net != NULL) {
4207                                 flowlabel = net->flowlabel;
4208                         } else {
4209                                 flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
4210                         }
4211
4212                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4213                         if (port) {
4214                                 len += sizeof(struct udphdr);
4215                         }
4216                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4217                         if (newm == NULL) {
4218                                 sctp_m_freem(m);
4219                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4220                                 return (ENOMEM);
4221                         }
4222                         SCTP_ALIGN_TO_END(newm, len);
4223                         SCTP_BUF_LEN(newm) = len;
4224                         SCTP_BUF_NEXT(newm) = m;
4225                         m = newm;
4226                         if (net != NULL) {
4227 #ifdef INVARIANTS
4228                                 if (net->flowidset == 0) {
4229                                         panic("Flow ID not set");
4230                                 }
4231 #endif
4232                                 m->m_pkthdr.flowid = net->flowid;
4233                                 m->m_flags |= M_FLOWID;
4234                         } else {
4235                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
4236                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
4237                                         m->m_flags |= M_FLOWID;
4238                                 }
4239                         }
4240                         packet_length = sctp_calculate_len(m);
4241
4242                         ip6h = mtod(m, struct ip6_hdr *);
4243                         /*
4244                          * We assume here that inp_flow is in host byte
4245                          * order within the TCB!
4246                          */
4247                         flowBottom = flowlabel & 0x0000ffff;
4248                         flowTop = ((flowlabel & 0x000f0000) >> 16);
4249                         tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
4250                         /* protect *sin6 from overwrite */
4251                         sin6 = (struct sockaddr_in6 *)to;
4252                         tmp = *sin6;
4253                         sin6 = &tmp;
4254
4255                         /* KAME hack: embed scopeid */
4256                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4257                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4258                                 return (EINVAL);
4259                         }
4260                         if (net == NULL) {
4261                                 memset(&ip6route, 0, sizeof(ip6route));
4262                                 ro = (sctp_route_t *) & ip6route;
4263                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4264                         } else {
4265                                 ro = (sctp_route_t *) & net->ro;
4266                         }
4267                         tosBottom = (((struct in6pcb *)inp)->in6p_flowinfo & 0x0c);
4268                         if (ecn_ok) {
4269                                 tosBottom |= sctp_get_ect(stcb, chk);
4270                         }
4271                         tosBottom <<= 4;
4272                         ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
4273                         if (port) {
4274                                 ip6h->ip6_nxt = IPPROTO_UDP;
4275                         } else {
4276                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4277                         }
4278                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4279                         ip6h->ip6_dst = sin6->sin6_addr;
4280
4281                         /*
4282                          * Add SRC address selection here: we can only reuse
4283                          * to a limited degree the kame src-addr-sel, since
4284                          * we can try their selection but it may not be
4285                          * bound.
4286                          */
4287                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4288                         lsa6_tmp.sin6_family = AF_INET6;
4289                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4290                         lsa6 = &lsa6_tmp;
4291                         if (net && out_of_asoc_ok == 0) {
4292                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4293                                         sctp_free_ifa(net->ro._s_addr);
4294                                         net->ro._s_addr = NULL;
4295                                         net->src_addr_selected = 0;
4296                                         if (ro->ro_rt) {
4297                                                 RTFREE(ro->ro_rt);
4298                                                 ro->ro_rt = NULL;
4299                                         }
4300                                 }
4301                                 if (net->src_addr_selected == 0) {
4302                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4303                                         /* KAME hack: embed scopeid */
4304                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4305                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4306                                                 return (EINVAL);
4307                                         }
4308                                         /* Cache the source address */
4309                                         net->ro._s_addr = sctp_source_address_selection(inp,
4310                                             stcb,
4311                                             ro,
4312                                             net,
4313                                             0,
4314                                             vrf_id);
4315                                         (void)sa6_recoverscope(sin6);
4316                                         net->src_addr_selected = 1;
4317                                 }
4318                                 if (net->ro._s_addr == NULL) {
4319                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4320                                         net->src_addr_selected = 0;
4321                                         sctp_handle_no_route(stcb, net, so_locked);
4322                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4323                                         sctp_m_freem(m);
4324                                         return (EHOSTUNREACH);
4325                                 }
4326                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4327                         } else {
4328                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4329                                 /* KAME hack: embed scopeid */
4330                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4331                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4332                                         return (EINVAL);
4333                                 }
4334                                 if (over_addr == NULL) {
4335                                         struct sctp_ifa *_lsrc;
4336
4337                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4338                                             net,
4339                                             out_of_asoc_ok,
4340                                             vrf_id);
4341                                         if (_lsrc == NULL) {
4342                                                 sctp_handle_no_route(stcb, net, so_locked);
4343                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4344                                                 sctp_m_freem(m);
4345                                                 return (EHOSTUNREACH);
4346                                         }
4347                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4348                                         sctp_free_ifa(_lsrc);
4349                                 } else {
4350                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4351                                         SCTP_RTALLOC(ro, vrf_id);
4352                                 }
4353                                 (void)sa6_recoverscope(sin6);
4354                         }
4355                         lsa6->sin6_port = inp->sctp_lport;
4356
4357                         if (ro->ro_rt == NULL) {
4358                                 /*
4359                                  * src addr selection failed to find a route
4360                                  * (or valid source addr), so we can't get
4361                                  * there from here!
4362                                  */
4363                                 sctp_handle_no_route(stcb, net, so_locked);
4364                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4365                                 sctp_m_freem(m);
4366                                 return (EHOSTUNREACH);
4367                         }
4368                         /*
4369                          * XXX: sa6 may not have a valid sin6_scope_id in
4370                          * the non-SCOPEDROUTING case.
4371                          */
4372                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4373                         lsa6_storage.sin6_family = AF_INET6;
4374                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4375                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4376                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4377                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4378                                 sctp_m_freem(m);
4379                                 return (error);
4380                         }
4381                         /* XXX */
4382                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4383                         lsa6_storage.sin6_port = inp->sctp_lport;
4384                         lsa6 = &lsa6_storage;
4385                         ip6h->ip6_src = lsa6->sin6_addr;
4386
4387                         if (port) {
4388                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4389                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4390                                 udp->uh_dport = port;
4391                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4392                                 udp->uh_sum = 0;
4393                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4394                         } else {
4395                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4396                         }
4397
4398                         sctphdr->src_port = src_port;
4399                         sctphdr->dest_port = dest_port;
4400                         sctphdr->v_tag = v_tag;
4401                         sctphdr->checksum = 0;
4402
4403                         /*
4404                          * We set the hop limit now since there is a good
4405                          * chance that our ro pointer is now filled
4406                          */
4407                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4408                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4409
4410 #ifdef SCTP_DEBUG
4411                         /* Copy to be sure something bad is not happening */
4412                         sin6->sin6_addr = ip6h->ip6_dst;
4413                         lsa6->sin6_addr = ip6h->ip6_src;
4414 #endif
4415
4416                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4417                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4418                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4419                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4420                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4421                         if (net) {
4422                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4423                                 /*
4424                                  * preserve the port and scope for link
4425                                  * local send
4426                                  */
4427                                 prev_scope = sin6->sin6_scope_id;
4428                                 prev_port = sin6->sin6_port;
4429                         }
4430                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4431                                 /* failed to prepend data, give up */
4432                                 sctp_m_freem(m);
4433                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4434                                 return (ENOMEM);
4435                         }
4436 #ifdef  SCTP_PACKET_LOGGING
4437                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4438                                 sctp_packet_log(m, packet_length);
4439 #endif
4440                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4441                         if (port) {
4442 #if defined(SCTP_WITH_NO_CSUM)
4443                                 SCTP_STAT_INCR(sctps_sendnocrc);
4444 #else
4445                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4446                                     (stcb) &&
4447                                     (stcb->asoc.loopback_scope))) {
4448                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4449                                         SCTP_STAT_INCR(sctps_sendswcrc);
4450                                 } else {
4451                                         SCTP_STAT_INCR(sctps_sendnocrc);
4452                                 }
4453 #endif
4454                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4455                                         udp->uh_sum = 0xffff;
4456                                 }
4457                         } else {
4458 #if defined(SCTP_WITH_NO_CSUM)
4459                                 SCTP_STAT_INCR(sctps_sendnocrc);
4460 #else
4461                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4462                                 m->m_pkthdr.csum_data = 0;
4463                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4464 #endif
4465                         }
4466                         /* send it out. table id is taken from stcb */
4467 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4468                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4469                                 so = SCTP_INP_SO(inp);
4470                                 SCTP_SOCKET_UNLOCK(so, 0);
4471                         }
4472 #endif
4473                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4474 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4475                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4476                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4477                                 SCTP_TCB_UNLOCK(stcb);
4478                                 SCTP_SOCKET_LOCK(so, 0);
4479                                 SCTP_TCB_LOCK(stcb);
4480                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4481                         }
4482 #endif
4483                         if (net) {
4484                                 /* for link local this must be done */
4485                                 sin6->sin6_scope_id = prev_scope;
4486                                 sin6->sin6_port = prev_port;
4487                         }
4488                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4489                         SCTP_STAT_INCR(sctps_sendpackets);
4490                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4491                         if (ret) {
4492                                 SCTP_STAT_INCR(sctps_senderrors);
4493                         }
4494                         if (net == NULL) {
4495                                 /* Now if we had a temp route free it */
4496                                 if (ro->ro_rt) {
4497                                         RTFREE(ro->ro_rt);
4498                                 }
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, *m_at, *mp_last;
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_ecn_supported_param *ecn;
4561         struct sctp_prsctp_supported_param *prsctp;
4562         struct sctp_supported_chunk_types_param *pr_supported;
4563         int cnt_inits_to = 0;
4564         int padval, ret;
4565         int num_ext;
4566         int p_len;
4567
4568         /* INIT's always go to the primary (and usually ONLY address) */
4569         mp_last = NULL;
4570         net = stcb->asoc.primary_destination;
4571         if (net == NULL) {
4572                 net = TAILQ_FIRST(&stcb->asoc.nets);
4573                 if (net == NULL) {
4574                         /* TSNH */
4575                         return;
4576                 }
4577                 /* we confirm any address we send an INIT to */
4578                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4579                 (void)sctp_set_primary_addr(stcb, NULL, net);
4580         } else {
4581                 /* we confirm any address we send an INIT to */
4582                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4583         }
4584         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4585 #ifdef INET6
4586         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4587                 /*
4588                  * special hook, if we are sending to link local it will not
4589                  * show up in our private address count.
4590                  */
4591                 struct sockaddr_in6 *sin6l;
4592
4593                 sin6l = &net->ro._l_addr.sin6;
4594                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4595                         cnt_inits_to = 1;
4596         }
4597 #endif
4598         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4599                 /* This case should not happen */
4600                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4601                 return;
4602         }
4603         /* start the INIT timer */
4604         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4605
4606         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4607         if (m == NULL) {
4608                 /* No memory, INIT timer will re-attempt. */
4609                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4610                 return;
4611         }
4612         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4613         /*
4614          * assume peer supports asconf in order to be able to queue local
4615          * address changes while an INIT is in flight and before the assoc
4616          * is established.
4617          */
4618         stcb->asoc.peer_supports_asconf = 1;
4619         /* Now lets put the SCTP header in place */
4620         init = mtod(m, struct sctp_init_chunk *);
4621         /* now the chunk header */
4622         init->ch.chunk_type = SCTP_INITIATION;
4623         init->ch.chunk_flags = 0;
4624         /* fill in later from mbuf we build */
4625         init->ch.chunk_length = 0;
4626         /* place in my tag */
4627         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4628         /* set up some of the credits. */
4629         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4630             SCTP_MINIMAL_RWND));
4631
4632         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4633         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4634         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4635         /* now the address restriction */
4636         /* XXX Should we take the address family of the socket into account? */
4637         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4638             sizeof(*init));
4639         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4640 #ifdef INET6
4641 #ifdef INET
4642         /* we support 2 types: IPv4/IPv6 */
4643         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4644         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4645         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4646 #else
4647         /* we support 1 type: IPv6 */
4648         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4649         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4650         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4651 #endif
4652 #else
4653         /* we support 1 type: IPv4 */
4654         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4655         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4656         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4657 #endif
4658         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4659         /* adaptation layer indication parameter */
4660         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4661         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4662         ali->ph.param_length = htons(sizeof(*ali));
4663         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4664         SCTP_BUF_LEN(m) += sizeof(*ali);
4665         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4666
4667         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4668                 /* Add NAT friendly parameter */
4669                 struct sctp_paramhdr *ph;
4670
4671                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4672                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4673                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4674                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4675                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4676         }
4677         /* now any cookie time extensions */
4678         if (stcb->asoc.cookie_preserve_req) {
4679                 struct sctp_cookie_perserve_param *cookie_preserve;
4680
4681                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4682                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4683                 cookie_preserve->ph.param_length = htons(
4684                     sizeof(*cookie_preserve));
4685                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4686                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4687                 ecn = (struct sctp_ecn_supported_param *)(
4688                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4689                 stcb->asoc.cookie_preserve_req = 0;
4690         }
4691         /* ECN parameter */
4692         if (stcb->asoc.ecn_allowed == 1) {
4693                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4694                 ecn->ph.param_length = htons(sizeof(*ecn));
4695                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4696                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4697                     sizeof(*ecn));
4698         } else {
4699                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4700         }
4701         /* And now tell the peer we do pr-sctp */
4702         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4703         prsctp->ph.param_length = htons(sizeof(*prsctp));
4704         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4705
4706         /* And now tell the peer we do all the extensions */
4707         pr_supported = (struct sctp_supported_chunk_types_param *)
4708             ((caddr_t)prsctp + sizeof(*prsctp));
4709         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4710         num_ext = 0;
4711         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4712         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4713         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4714         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4715         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4716         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4717                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4718         }
4719         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4720                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4721         }
4722         p_len = sizeof(*pr_supported) + num_ext;
4723         pr_supported->ph.param_length = htons(p_len);
4724         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4725         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4726
4727
4728         /* add authentication parameters */
4729         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4730                 struct sctp_auth_random *randp;
4731                 struct sctp_auth_hmac_algo *hmacs;
4732                 struct sctp_auth_chunk_list *chunks;
4733
4734                 /* attach RANDOM parameter, if available */
4735                 if (stcb->asoc.authinfo.random != NULL) {
4736                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4737                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4738                         /* random key already contains the header */
4739                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4740                         /* zero out any padding required */
4741                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4742                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4743                 }
4744                 /* add HMAC_ALGO parameter */
4745                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4746                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4747                     (uint8_t *) hmacs->hmac_ids);
4748                 if (p_len > 0) {
4749                         p_len += sizeof(*hmacs);
4750                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4751                         hmacs->ph.param_length = htons(p_len);
4752                         /* zero out any padding required */
4753                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4754                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4755                 }
4756                 /* add CHUNKS parameter */
4757                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4758                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4759                     chunks->chunk_types);
4760                 if (p_len > 0) {
4761                         p_len += sizeof(*chunks);
4762                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4763                         chunks->ph.param_length = htons(p_len);
4764                         /* zero out any padding required */
4765                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4766                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4767                 }
4768         }
4769         m_at = m;
4770         /* now the addresses */
4771         {
4772                 struct sctp_scoping scp;
4773
4774                 /*
4775                  * To optimize this we could put the scoping stuff into a
4776                  * structure and remove the individual uint8's from the
4777                  * assoc structure. Then we could just sifa in the address
4778                  * within the stcb.. but for now this is a quick hack to get
4779                  * the address stuff teased apart.
4780                  */
4781                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4782                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4783                 scp.loopback_scope = stcb->asoc.loopback_scope;
4784                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4785                 scp.local_scope = stcb->asoc.local_scope;
4786                 scp.site_scope = stcb->asoc.site_scope;
4787
4788                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
4789         }
4790
4791         /* calulate the size and update pkt header and chunk header */
4792         p_len = 0;
4793         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4794                 if (SCTP_BUF_NEXT(m_at) == NULL)
4795                         mp_last = m_at;
4796                 p_len += SCTP_BUF_LEN(m_at);
4797         }
4798         init->ch.chunk_length = htons(p_len);
4799         /*
4800          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4801          * here since the timer will drive a retranmission.
4802          */
4803
4804         /* I don't expect this to execute but we will be safe here */
4805         padval = p_len % 4;
4806         if ((padval) && (mp_last)) {
4807                 /*
4808                  * The compiler worries that mp_last may not be set even
4809                  * though I think it is impossible :-> however we add
4810                  * mp_last here just in case.
4811                  */
4812                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4813                 if (ret) {
4814                         /* Houston we have a problem, no space */
4815                         sctp_m_freem(m);
4816                         return;
4817                 }
4818                 p_len += padval;
4819         }
4820         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4821         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4822             (struct sockaddr *)&net->ro._l_addr,
4823             m, 0, NULL, 0, 0, 0, NULL, 0,
4824             inp->sctp_lport, stcb->rport, htonl(0),
4825             net->port, so_locked, NULL, NULL);
4826         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4827         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4828         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4829 }
4830
4831 struct mbuf *
4832 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4833     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4834 {
4835         /*
4836          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4837          * being equal to the beginning of the params i.e. (iphlen +
4838          * sizeof(struct sctp_init_msg) parse through the parameters to the
4839          * end of the mbuf verifying that all parameters are known.
4840          *
4841          * For unknown parameters build and return a mbuf with
4842          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4843          * processing this chunk stop, and set *abort_processing to 1.
4844          *
4845          * By having param_offset be pre-set to where parameters begin it is
4846          * hoped that this routine may be reused in the future by new
4847          * features.
4848          */
4849         struct sctp_paramhdr *phdr, params;
4850
4851         struct mbuf *mat, *op_err;
4852         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4853         int at, limit, pad_needed;
4854         uint16_t ptype, plen, padded_size;
4855         int err_at;
4856
4857         *abort_processing = 0;
4858         mat = in_initpkt;
4859         err_at = 0;
4860         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4861         at = param_offset;
4862         op_err = NULL;
4863         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4864         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4865         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4866                 ptype = ntohs(phdr->param_type);
4867                 plen = ntohs(phdr->param_length);
4868                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4869                         /* wacked parameter */
4870                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4871                         goto invalid_size;
4872                 }
4873                 limit -= SCTP_SIZE32(plen);
4874                 /*-
4875                  * All parameters for all chunks that we know/understand are
4876                  * listed here. We process them other places and make
4877                  * appropriate stop actions per the upper bits. However this
4878                  * is the generic routine processor's can call to get back
4879                  * an operr.. to either incorporate (init-ack) or send.
4880                  */
4881                 padded_size = SCTP_SIZE32(plen);
4882                 switch (ptype) {
4883                         /* Param's with variable size */
4884                 case SCTP_HEARTBEAT_INFO:
4885                 case SCTP_STATE_COOKIE:
4886                 case SCTP_UNRECOG_PARAM:
4887                 case SCTP_ERROR_CAUSE_IND:
4888                         /* ok skip fwd */
4889                         at += padded_size;
4890                         break;
4891                         /* Param's with variable size within a range */
4892                 case SCTP_CHUNK_LIST:
4893                 case SCTP_SUPPORTED_CHUNK_EXT:
4894                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4895                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4896                                 goto invalid_size;
4897                         }
4898                         at += padded_size;
4899                         break;
4900                 case SCTP_SUPPORTED_ADDRTYPE:
4901                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4902                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4903                                 goto invalid_size;
4904                         }
4905                         at += padded_size;
4906                         break;
4907                 case SCTP_RANDOM:
4908                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4909                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4910                                 goto invalid_size;
4911                         }
4912                         at += padded_size;
4913                         break;
4914                 case SCTP_SET_PRIM_ADDR:
4915                 case SCTP_DEL_IP_ADDRESS:
4916                 case SCTP_ADD_IP_ADDRESS:
4917                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4918                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4919                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4920                                 goto invalid_size;
4921                         }
4922                         at += padded_size;
4923                         break;
4924                         /* Param's with a fixed size */
4925                 case SCTP_IPV4_ADDRESS:
4926                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4927                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4928                                 goto invalid_size;
4929                         }
4930                         at += padded_size;
4931                         break;
4932                 case SCTP_IPV6_ADDRESS:
4933                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4934                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4935                                 goto invalid_size;
4936                         }
4937                         at += padded_size;
4938                         break;
4939                 case SCTP_COOKIE_PRESERVE:
4940                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4941                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4942                                 goto invalid_size;
4943                         }
4944                         at += padded_size;
4945                         break;
4946                 case SCTP_HAS_NAT_SUPPORT:
4947                         *nat_friendly = 1;
4948                         /* fall through */
4949                 case SCTP_PRSCTP_SUPPORTED:
4950
4951                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4952                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4953                                 goto invalid_size;
4954                         }
4955                         at += padded_size;
4956                         break;
4957                 case SCTP_ECN_CAPABLE:
4958                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4959                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4960                                 goto invalid_size;
4961                         }
4962                         at += padded_size;
4963                         break;
4964                 case SCTP_ULP_ADAPTATION:
4965                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4966                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4967                                 goto invalid_size;
4968                         }
4969                         at += padded_size;
4970                         break;
4971                 case SCTP_SUCCESS_REPORT:
4972                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4973                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4974                                 goto invalid_size;
4975                         }
4976                         at += padded_size;
4977                         break;
4978                 case SCTP_HOSTNAME_ADDRESS:
4979                         {
4980                                 /* We can NOT handle HOST NAME addresses!! */
4981                                 int l_len;
4982
4983                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4984                                 *abort_processing = 1;
4985                                 if (op_err == NULL) {
4986                                         /* Ok need to try to get a mbuf */
4987 #ifdef INET6
4988                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4989 #else
4990                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4991 #endif
4992                                         l_len += plen;
4993                                         l_len += sizeof(struct sctp_paramhdr);
4994                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4995                                         if (op_err) {
4996                                                 SCTP_BUF_LEN(op_err) = 0;
4997                                                 /*
4998                                                  * pre-reserve space for ip
4999                                                  * and sctp header  and
5000                                                  * chunk hdr
5001                                                  */
5002 #ifdef INET6
5003                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5004 #else
5005                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5006 #endif
5007                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5008                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5009                                         }
5010                                 }
5011                                 if (op_err) {
5012                                         /* If we have space */
5013                                         struct sctp_paramhdr s;
5014
5015                                         if (err_at % 4) {
5016                                                 uint32_t cpthis = 0;
5017
5018                                                 pad_needed = 4 - (err_at % 4);
5019                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5020                                                 err_at += pad_needed;
5021                                         }
5022                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5023                                         s.param_length = htons(sizeof(s) + plen);
5024                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5025                                         err_at += sizeof(s);
5026                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5027                                         if (phdr == NULL) {
5028                                                 sctp_m_freem(op_err);
5029                                                 /*
5030                                                  * we are out of memory but
5031                                                  * we still need to have a
5032                                                  * look at what to do (the
5033                                                  * system is in trouble
5034                                                  * though).
5035                                                  */
5036                                                 return (NULL);
5037                                         }
5038                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5039                                         err_at += plen;
5040                                 }
5041                                 return (op_err);
5042                                 break;
5043                         }
5044                 default:
5045                         /*
5046                          * we do not recognize the parameter figure out what
5047                          * we do.
5048                          */
5049                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5050                         if ((ptype & 0x4000) == 0x4000) {
5051                                 /* Report bit is set?? */
5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5053                                 if (op_err == NULL) {
5054                                         int l_len;
5055
5056                                         /* Ok need to try to get an mbuf */
5057 #ifdef INET6
5058                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5059 #else
5060                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5061 #endif
5062                                         l_len += plen;
5063                                         l_len += sizeof(struct sctp_paramhdr);
5064                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5065                                         if (op_err) {
5066                                                 SCTP_BUF_LEN(op_err) = 0;
5067 #ifdef INET6
5068                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5069 #else
5070                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5071 #endif
5072                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5073                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5074                                         }
5075                                 }
5076                                 if (op_err) {
5077                                         /* If we have space */
5078                                         struct sctp_paramhdr s;
5079
5080                                         if (err_at % 4) {
5081                                                 uint32_t cpthis = 0;
5082
5083                                                 pad_needed = 4 - (err_at % 4);
5084                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5085                                                 err_at += pad_needed;
5086                                         }
5087                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5088                                         s.param_length = htons(sizeof(s) + plen);
5089                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5090                                         err_at += sizeof(s);
5091                                         if (plen > sizeof(tempbuf)) {
5092                                                 plen = sizeof(tempbuf);
5093                                         }
5094                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5095                                         if (phdr == NULL) {
5096                                                 sctp_m_freem(op_err);
5097                                                 /*
5098                                                  * we are out of memory but
5099                                                  * we still need to have a
5100                                                  * look at what to do (the
5101                                                  * system is in trouble
5102                                                  * though).
5103                                                  */
5104                                                 op_err = NULL;
5105                                                 goto more_processing;
5106                                         }
5107                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5108                                         err_at += plen;
5109                                 }
5110                         }
5111         more_processing:
5112                         if ((ptype & 0x8000) == 0x0000) {
5113                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5114                                 return (op_err);
5115                         } else {
5116                                 /* skip this chunk and continue processing */
5117                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5118                                 at += SCTP_SIZE32(plen);
5119                         }
5120                         break;
5121
5122                 }
5123                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5124         }
5125         return (op_err);
5126 invalid_size:
5127         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5128         *abort_processing = 1;
5129         if ((op_err == NULL) && phdr) {
5130                 int l_len;
5131
5132 #ifdef INET6
5133                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5134 #else
5135                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5136 #endif
5137                 l_len += (2 * sizeof(struct sctp_paramhdr));
5138                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5139                 if (op_err) {
5140                         SCTP_BUF_LEN(op_err) = 0;
5141 #ifdef INET6
5142                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5143 #else
5144                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5145 #endif
5146                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5147                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5148                 }
5149         }
5150         if ((op_err) && phdr) {
5151                 struct sctp_paramhdr s;
5152
5153                 if (err_at % 4) {
5154                         uint32_t cpthis = 0;
5155
5156                         pad_needed = 4 - (err_at % 4);
5157                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5158                         err_at += pad_needed;
5159                 }
5160                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5161                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5162                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5163                 err_at += sizeof(s);
5164                 /* Only copy back the p-hdr that caused the issue */
5165                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5166         }
5167         return (op_err);
5168 }
5169
5170 static int
5171 sctp_are_there_new_addresses(struct sctp_association *asoc,
5172     struct mbuf *in_initpkt, int iphlen, int offset)
5173 {
5174         /*
5175          * Given a INIT packet, look through the packet to verify that there
5176          * are NO new addresses. As we go through the parameters add reports
5177          * of any un-understood parameters that require an error.  Also we
5178          * must return (1) to drop the packet if we see a un-understood
5179          * parameter that tells us to drop the chunk.
5180          */
5181         struct sockaddr *sa_touse;
5182         struct sockaddr *sa;
5183         struct sctp_paramhdr *phdr, params;
5184         uint16_t ptype, plen;
5185         uint8_t fnd;
5186         struct sctp_nets *net;
5187         struct ip *iph;
5188
5189 #ifdef INET
5190         struct sockaddr_in sin4, *sa4;
5191
5192 #endif
5193 #ifdef INET6
5194         struct sockaddr_in6 sin6, *sa6;
5195         struct ip6_hdr *ip6h;
5196
5197 #endif
5198
5199 #ifdef INET
5200         memset(&sin4, 0, sizeof(sin4));
5201         sin4.sin_family = AF_INET;
5202         sin4.sin_len = sizeof(sin4);
5203 #endif
5204 #ifdef INET6
5205         memset(&sin6, 0, sizeof(sin6));
5206         sin6.sin6_family = AF_INET6;
5207         sin6.sin6_len = sizeof(sin6);
5208 #endif
5209         sa_touse = NULL;
5210         /* First what about the src address of the pkt ? */
5211         iph = mtod(in_initpkt, struct ip *);
5212         switch (iph->ip_v) {
5213 #ifdef INET
5214         case IPVERSION:
5215                 /* source addr is IPv4 */
5216                 sin4.sin_addr = iph->ip_src;
5217                 sa_touse = (struct sockaddr *)&sin4;
5218                 break;
5219 #endif
5220 #ifdef INET6
5221         case IPV6_VERSION >> 4:
5222                 /* source addr is IPv6 */
5223                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
5224                 sin6.sin6_addr = ip6h->ip6_src;
5225                 sa_touse = (struct sockaddr *)&sin6;
5226                 break;
5227 #endif
5228         default:
5229                 return (1);
5230         }
5231
5232         fnd = 0;
5233         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5234                 sa = (struct sockaddr *)&net->ro._l_addr;
5235                 if (sa->sa_family == sa_touse->sa_family) {
5236 #ifdef INET
5237                         if (sa->sa_family == AF_INET) {
5238                                 sa4 = (struct sockaddr_in *)sa;
5239                                 if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5240                                         fnd = 1;
5241                                         break;
5242                                 }
5243                         }
5244 #endif
5245 #ifdef INET6
5246                         if (sa->sa_family == AF_INET6) {
5247                                 sa6 = (struct sockaddr_in6 *)sa;
5248                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5249                                         fnd = 1;
5250                                         break;
5251                                 }
5252                         }
5253 #endif
5254                 }
5255         }
5256         if (fnd == 0) {
5257                 /* New address added! no need to look futher. */
5258                 return (1);
5259         }
5260         /* Ok so far lets munge through the rest of the packet */
5261         offset += sizeof(struct sctp_init_chunk);
5262         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5263         while (phdr) {
5264                 sa_touse = NULL;
5265                 ptype = ntohs(phdr->param_type);
5266                 plen = ntohs(phdr->param_length);
5267                 switch (ptype) {
5268 #ifdef INET
5269                 case SCTP_IPV4_ADDRESS:
5270                         {
5271                                 struct sctp_ipv4addr_param *p4, p4_buf;
5272
5273                                 phdr = sctp_get_next_param(in_initpkt, offset,
5274                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5275                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5276                                     phdr == NULL) {
5277                                         return (1);
5278                                 }
5279                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5280                                 sin4.sin_addr.s_addr = p4->addr;
5281                                 sa_touse = (struct sockaddr *)&sin4;
5282                         }
5283 #endif
5284 #ifdef INET6
5285                 case SCTP_IPV6_ADDRESS:
5286                         {
5287                                 struct sctp_ipv6addr_param *p6, p6_buf;
5288
5289                                 phdr = sctp_get_next_param(in_initpkt, offset,
5290                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5291                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5292                                     phdr == NULL) {
5293                                         return (1);
5294                                 }
5295                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5296                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5297                                     sizeof(p6->addr));
5298                                 sa_touse = (struct sockaddr *)&sin6;
5299                         }
5300 #endif
5301                 default:
5302                         sa_touse = NULL;
5303                 }
5304                 if (sa_touse) {
5305                         /* ok, sa_touse points to one to check */
5306                         fnd = 0;
5307                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5308                                 sa = (struct sockaddr *)&net->ro._l_addr;
5309                                 if (sa->sa_family != sa_touse->sa_family) {
5310                                         continue;
5311                                 }
5312 #ifdef INET
5313                                 if (sa->sa_family == AF_INET) {
5314                                         sa4 = (struct sockaddr_in *)sa;
5315                                         if (sa4->sin_addr.s_addr ==
5316                                             sin4.sin_addr.s_addr) {
5317                                                 fnd = 1;
5318                                                 break;
5319                                         }
5320                                 }
5321 #endif
5322 #ifdef INET6
5323                                 if (sa->sa_family == AF_INET6) {
5324                                         sa6 = (struct sockaddr_in6 *)sa;
5325                                         if (SCTP6_ARE_ADDR_EQUAL(
5326                                             sa6, &sin6)) {
5327                                                 fnd = 1;
5328                                                 break;
5329                                         }
5330                                 }
5331 #endif
5332                         }
5333                         if (!fnd) {
5334                                 /* New addr added! no need to look further */
5335                                 return (1);
5336                         }
5337                 }
5338                 offset += SCTP_SIZE32(plen);
5339                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5340         }
5341         return (0);
5342 }
5343
5344 /*
5345  * Given a MBUF chain that was sent into us containing an INIT. Build a
5346  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5347  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5348  * message (i.e. the struct sctp_init_msg).
5349  */
5350 void
5351 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5352     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
5353     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5354 {
5355         struct sctp_association *asoc;
5356         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5357         struct sctp_init_ack_chunk *initack;
5358         struct sctp_adaptation_layer_indication *ali;
5359         struct sctp_ecn_supported_param *ecn;
5360         struct sctp_prsctp_supported_param *prsctp;
5361         struct sctp_supported_chunk_types_param *pr_supported;
5362         union sctp_sockstore store, store1, *over_addr;
5363
5364 #ifdef INET
5365         struct sockaddr_in *sin, *to_sin;
5366
5367 #endif
5368 #ifdef INET6
5369         struct sockaddr_in6 *sin6, *to_sin6;
5370
5371 #endif
5372         struct ip *iph;
5373
5374 #ifdef INET6
5375         struct ip6_hdr *ip6;
5376
5377 #endif
5378         struct sockaddr *to;
5379         struct sctp_state_cookie stc;
5380         struct sctp_nets *net = NULL;
5381         uint8_t *signature = NULL;
5382         int cnt_inits_to = 0;
5383         uint16_t his_limit, i_want;
5384         int abort_flag, padval;
5385         int num_ext;
5386         int p_len;
5387         int nat_friendly = 0;
5388         struct socket *so;
5389
5390         if (stcb)
5391                 asoc = &stcb->asoc;
5392         else
5393                 asoc = NULL;
5394         mp_last = NULL;
5395         if ((asoc != NULL) &&
5396             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5397             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
5398                 /* new addresses, out of here in non-cookie-wait states */
5399                 /*
5400                  * Send a ABORT, we don't add the new address error clause
5401                  * though we even set the T bit and copy in the 0 tag.. this
5402                  * looks no different than if no listener was present.
5403                  */
5404                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5405                 return;
5406         }
5407         abort_flag = 0;
5408         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5409             (offset + sizeof(struct sctp_init_chunk)),
5410             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5411         if (abort_flag) {
5412 do_a_abort:
5413                 sctp_send_abort(init_pkt, iphlen, sh,
5414                     init_chk->init.initiate_tag, op_err, vrf_id, port);
5415                 return;
5416         }
5417         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5418         if (m == NULL) {
5419                 /* No memory, INIT timer will re-attempt. */
5420                 if (op_err)
5421                         sctp_m_freem(op_err);
5422                 return;
5423         }
5424         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5425
5426         /* the time I built cookie */
5427         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5428
5429         /* populate any tie tags */
5430         if (asoc != NULL) {
5431                 /* unlock before tag selections */
5432                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5433                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5434                 stc.cookie_life = asoc->cookie_life;
5435                 net = asoc->primary_destination;
5436         } else {
5437                 stc.tie_tag_my_vtag = 0;
5438                 stc.tie_tag_peer_vtag = 0;
5439                 /* life I will award this cookie */
5440                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5441         }
5442
5443         /* copy in the ports for later check */
5444         stc.myport = sh->dest_port;
5445         stc.peerport = sh->src_port;
5446
5447         /*
5448          * If we wanted to honor cookie life extentions, we would add to
5449          * stc.cookie_life. For now we should NOT honor any extension
5450          */
5451         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5452         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5453                 struct inpcb *in_inp;
5454
5455                 /* Its a V6 socket */
5456                 in_inp = (struct inpcb *)inp;
5457                 stc.ipv6_addr_legal = 1;
5458                 /* Now look at the binding flag to see if V4 will be legal */
5459                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5460                         stc.ipv4_addr_legal = 1;
5461                 } else {
5462                         /* V4 addresses are NOT legal on the association */
5463                         stc.ipv4_addr_legal = 0;
5464                 }
5465         } else {
5466                 /* Its a V4 socket, no - V6 */
5467                 stc.ipv4_addr_legal = 1;
5468                 stc.ipv6_addr_legal = 0;
5469         }
5470
5471 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5472         stc.ipv4_scope = 1;
5473 #else
5474         stc.ipv4_scope = 0;
5475 #endif
5476         /* now for scope setup */
5477         memset((caddr_t)&store, 0, sizeof(store));
5478         memset((caddr_t)&store1, 0, sizeof(store1));
5479 #ifdef INET
5480         sin = &store.sin;
5481         to_sin = &store1.sin;
5482 #endif
5483 #ifdef INET6
5484         sin6 = &store.sin6;
5485         to_sin6 = &store1.sin6;
5486 #endif
5487         iph = mtod(init_pkt, struct ip *);
5488         /* establish the to_addr's */
5489         switch (iph->ip_v) {
5490 #ifdef INET
5491         case IPVERSION:
5492                 to_sin->sin_port = sh->dest_port;
5493                 to_sin->sin_family = AF_INET;
5494                 to_sin->sin_len = sizeof(struct sockaddr_in);
5495                 to_sin->sin_addr = iph->ip_dst;
5496                 break;
5497 #endif
5498 #ifdef INET6
5499         case IPV6_VERSION >> 4:
5500                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5501                 to_sin6->sin6_addr = ip6->ip6_dst;
5502                 to_sin6->sin6_scope_id = 0;
5503                 to_sin6->sin6_port = sh->dest_port;
5504                 to_sin6->sin6_family = AF_INET6;
5505                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5506                 break;
5507 #endif
5508         default:
5509                 goto do_a_abort;
5510                 break;
5511         };
5512
5513         if (net == NULL) {
5514                 to = (struct sockaddr *)&store;
5515                 switch (iph->ip_v) {
5516 #ifdef INET
5517                 case IPVERSION:
5518                         {
5519                                 sin->sin_family = AF_INET;
5520                                 sin->sin_len = sizeof(struct sockaddr_in);
5521                                 sin->sin_port = sh->src_port;
5522                                 sin->sin_addr = iph->ip_src;
5523                                 /* lookup address */
5524                                 stc.address[0] = sin->sin_addr.s_addr;
5525                                 stc.address[1] = 0;
5526                                 stc.address[2] = 0;
5527                                 stc.address[3] = 0;
5528                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5529                                 /* local from address */
5530                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5531                                 stc.laddress[1] = 0;
5532                                 stc.laddress[2] = 0;
5533                                 stc.laddress[3] = 0;
5534                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5535                                 /* scope_id is only for v6 */
5536                                 stc.scope_id = 0;
5537 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5538                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5539                                         stc.ipv4_scope = 1;
5540                                 }
5541 #else
5542                                 stc.ipv4_scope = 1;
5543 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5544                                 /* Must use the address in this case */
5545                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5546                                         stc.loopback_scope = 1;
5547                                         stc.ipv4_scope = 1;
5548                                         stc.site_scope = 1;
5549                                         stc.local_scope = 0;
5550                                 }
5551                                 break;
5552                         }
5553 #endif
5554 #ifdef INET6
5555                 case IPV6_VERSION >> 4:
5556                         {
5557                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5558                                 sin6->sin6_family = AF_INET6;
5559                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5560                                 sin6->sin6_port = sh->src_port;
5561                                 sin6->sin6_addr = ip6->ip6_src;
5562                                 /* lookup address */
5563                                 memcpy(&stc.address, &sin6->sin6_addr,
5564                                     sizeof(struct in6_addr));
5565                                 sin6->sin6_scope_id = 0;
5566                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5567                                 stc.scope_id = 0;
5568                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5569                                         /*
5570                                          * FIX ME: does this have scope from
5571                                          * rcvif?
5572                                          */
5573                                         (void)sa6_recoverscope(sin6);
5574                                         stc.scope_id = sin6->sin6_scope_id;
5575                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5576                                         stc.loopback_scope = 1;
5577                                         stc.local_scope = 0;
5578                                         stc.site_scope = 1;
5579                                         stc.ipv4_scope = 1;
5580                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5581                                         /*
5582                                          * If the new destination is a
5583                                          * LINK_LOCAL we must have common
5584                                          * both site and local scope. Don't
5585                                          * set local scope though since we
5586                                          * must depend on the source to be
5587                                          * added implicitly. We cannot
5588                                          * assure just because we share one
5589                                          * link that all links are common.
5590                                          */
5591                                         stc.local_scope = 0;
5592                                         stc.site_scope = 1;
5593                                         stc.ipv4_scope = 1;
5594                                         /*
5595                                          * we start counting for the private
5596                                          * address stuff at 1. since the
5597                                          * link local we source from won't
5598                                          * show up in our scoped count.
5599                                          */
5600                                         cnt_inits_to = 1;
5601                                         /*
5602                                          * pull out the scope_id from
5603                                          * incoming pkt
5604                                          */
5605                                         /*
5606                                          * FIX ME: does this have scope from
5607                                          * rcvif?
5608                                          */
5609                                         (void)sa6_recoverscope(sin6);
5610                                         stc.scope_id = sin6->sin6_scope_id;
5611                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5612                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5613                                         /*
5614                                          * If the new destination is
5615                                          * SITE_LOCAL then we must have site
5616                                          * scope in common.
5617                                          */
5618                                         stc.site_scope = 1;
5619                                 }
5620                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5621                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5622                                 break;
5623                         }
5624 #endif
5625                 default:
5626                         /* TSNH */
5627                         goto do_a_abort;
5628                         break;
5629                 }
5630         } else {
5631                 /* set the scope per the existing tcb */
5632
5633 #ifdef INET6
5634                 struct sctp_nets *lnet;
5635
5636 #endif
5637
5638                 stc.loopback_scope = asoc->loopback_scope;
5639                 stc.ipv4_scope = asoc->ipv4_local_scope;
5640                 stc.site_scope = asoc->site_scope;
5641                 stc.local_scope = asoc->local_scope;
5642 #ifdef INET6
5643                 /* Why do we not consider IPv4 LL addresses? */
5644                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5645                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5646                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5647                                         /*
5648                                          * if we have a LL address, start
5649                                          * counting at 1.
5650                                          */
5651                                         cnt_inits_to = 1;
5652                                 }
5653                         }
5654                 }
5655 #endif
5656                 /* use the net pointer */
5657                 to = (struct sockaddr *)&net->ro._l_addr;
5658                 switch (to->sa_family) {
5659 #ifdef INET
5660                 case AF_INET:
5661                         sin = (struct sockaddr_in *)to;
5662                         stc.address[0] = sin->sin_addr.s_addr;
5663                         stc.address[1] = 0;
5664                         stc.address[2] = 0;
5665                         stc.address[3] = 0;
5666                         stc.addr_type = SCTP_IPV4_ADDRESS;
5667                         if (net->src_addr_selected == 0) {
5668                                 /*
5669                                  * strange case here, the INIT should have
5670                                  * did the selection.
5671                                  */
5672                                 net->ro._s_addr = sctp_source_address_selection(inp,
5673                                     stcb, (sctp_route_t *) & net->ro,
5674                                     net, 0, vrf_id);
5675                                 if (net->ro._s_addr == NULL)
5676                                         return;
5677
5678                                 net->src_addr_selected = 1;
5679
5680                         }
5681                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5682                         stc.laddress[1] = 0;
5683                         stc.laddress[2] = 0;
5684                         stc.laddress[3] = 0;
5685                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5686                         break;
5687 #endif
5688 #ifdef INET6
5689                 case AF_INET6:
5690                         sin6 = (struct sockaddr_in6 *)to;
5691                         memcpy(&stc.address, &sin6->sin6_addr,
5692                             sizeof(struct in6_addr));
5693                         stc.addr_type = SCTP_IPV6_ADDRESS;
5694                         if (net->src_addr_selected == 0) {
5695                                 /*
5696                                  * strange case here, the INIT should have
5697                                  * did the selection.
5698                                  */
5699                                 net->ro._s_addr = sctp_source_address_selection(inp,
5700                                     stcb, (sctp_route_t *) & net->ro,
5701                                     net, 0, vrf_id);
5702                                 if (net->ro._s_addr == NULL)
5703                                         return;
5704
5705                                 net->src_addr_selected = 1;
5706                         }
5707                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5708                             sizeof(struct in6_addr));
5709                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5710                         break;
5711 #endif
5712                 }
5713         }
5714         /* Now lets put the SCTP header in place */
5715         initack = mtod(m, struct sctp_init_ack_chunk *);
5716         /* Save it off for quick ref */
5717         stc.peers_vtag = init_chk->init.initiate_tag;
5718         /* who are we */
5719         memcpy(stc.identification, SCTP_VERSION_STRING,
5720             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5721         /* now the chunk header */
5722         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5723         initack->ch.chunk_flags = 0;
5724         /* fill in later from mbuf we build */
5725         initack->ch.chunk_length = 0;
5726         /* place in my tag */
5727         if ((asoc != NULL) &&
5728             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5729             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5730             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5731                 /* re-use the v-tags and init-seq here */
5732                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5733                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5734         } else {
5735                 uint32_t vtag, itsn;
5736
5737                 if (hold_inp_lock) {
5738                         SCTP_INP_INCR_REF(inp);
5739                         SCTP_INP_RUNLOCK(inp);
5740                 }
5741                 if (asoc) {
5742                         atomic_add_int(&asoc->refcnt, 1);
5743                         SCTP_TCB_UNLOCK(stcb);
5744         new_tag:
5745                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5746                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5747                                 /*
5748                                  * Got a duplicate vtag on some guy behind a
5749                                  * nat make sure we don't use it.
5750                                  */
5751                                 goto new_tag;
5752                         }
5753                         initack->init.initiate_tag = htonl(vtag);
5754                         /* get a TSN to use too */
5755                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5756                         initack->init.initial_tsn = htonl(itsn);
5757                         SCTP_TCB_LOCK(stcb);
5758                         atomic_add_int(&asoc->refcnt, -1);
5759                 } else {
5760                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5761                         initack->init.initiate_tag = htonl(vtag);
5762                         /* get a TSN to use too */
5763                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5764                 }
5765                 if (hold_inp_lock) {
5766                         SCTP_INP_RLOCK(inp);
5767                         SCTP_INP_DECR_REF(inp);
5768                 }
5769         }
5770         /* save away my tag to */
5771         stc.my_vtag = initack->init.initiate_tag;
5772
5773         /* set up some of the credits. */
5774         so = inp->sctp_socket;
5775         if (so == NULL) {
5776                 /* memory problem */
5777                 sctp_m_freem(m);
5778                 return;
5779         } else {
5780                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5781         }
5782         /* set what I want */
5783         his_limit = ntohs(init_chk->init.num_inbound_streams);
5784         /* choose what I want */
5785         if (asoc != NULL) {
5786                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5787                         i_want = asoc->streamoutcnt;
5788                 } else {
5789                         i_want = inp->sctp_ep.pre_open_stream_count;
5790                 }
5791         } else {
5792                 i_want = inp->sctp_ep.pre_open_stream_count;
5793         }
5794         if (his_limit < i_want) {
5795                 /* I Want more :< */
5796                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5797         } else {
5798                 /* I can have what I want :> */
5799                 initack->init.num_outbound_streams = htons(i_want);
5800         }
5801         /* tell him his limt. */
5802         initack->init.num_inbound_streams =
5803             htons(inp->sctp_ep.max_open_streams_intome);
5804
5805         /* adaptation layer indication parameter */
5806         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5807         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5808         ali->ph.param_length = htons(sizeof(*ali));
5809         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5810         SCTP_BUF_LEN(m) += sizeof(*ali);
5811         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5812
5813         /* ECN parameter */
5814         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5815             (inp->sctp_ecn_enable == 1)) {
5816                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5817                 ecn->ph.param_length = htons(sizeof(*ecn));
5818                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5819
5820                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5821                     sizeof(*ecn));
5822         } else {
5823                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5824         }
5825         /* And now tell the peer we do  pr-sctp */
5826         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5827         prsctp->ph.param_length = htons(sizeof(*prsctp));
5828         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5829         if (nat_friendly) {
5830                 /* Add NAT friendly parameter */
5831                 struct sctp_paramhdr *ph;
5832
5833                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5834                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5835                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5836                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5837         }
5838         /* And now tell the peer we do all the extensions */
5839         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5840         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5841         num_ext = 0;
5842         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5843         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5844         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5845         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5846         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5847         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5848                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5849         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5850                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5851         p_len = sizeof(*pr_supported) + num_ext;
5852         pr_supported->ph.param_length = htons(p_len);
5853         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5854         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5855
5856         /* add authentication parameters */
5857         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5858                 struct sctp_auth_random *randp;
5859                 struct sctp_auth_hmac_algo *hmacs;
5860                 struct sctp_auth_chunk_list *chunks;
5861                 uint16_t random_len;
5862
5863                 /* generate and add RANDOM parameter */
5864                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5865                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5866                 randp->ph.param_type = htons(SCTP_RANDOM);
5867                 p_len = sizeof(*randp) + random_len;
5868                 randp->ph.param_length = htons(p_len);
5869                 SCTP_READ_RANDOM(randp->random_data, random_len);
5870                 /* zero out any padding required */
5871                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5872                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5873
5874                 /* add HMAC_ALGO parameter */
5875                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5876                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5877                     (uint8_t *) hmacs->hmac_ids);
5878                 if (p_len > 0) {
5879                         p_len += sizeof(*hmacs);
5880                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5881                         hmacs->ph.param_length = htons(p_len);
5882                         /* zero out any padding required */
5883                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5884                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5885                 }
5886                 /* add CHUNKS parameter */
5887                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5888                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5889                     chunks->chunk_types);
5890                 if (p_len > 0) {
5891                         p_len += sizeof(*chunks);
5892                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5893                         chunks->ph.param_length = htons(p_len);
5894                         /* zero out any padding required */
5895                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5896                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5897                 }
5898         }
5899         m_at = m;
5900         /* now the addresses */
5901         {
5902                 struct sctp_scoping scp;
5903
5904                 /*
5905                  * To optimize this we could put the scoping stuff into a
5906                  * structure and remove the individual uint8's from the stc
5907                  * structure. Then we could just sifa in the address within
5908                  * the stc.. but for now this is a quick hack to get the
5909                  * address stuff teased apart.
5910                  */
5911                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5912                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5913                 scp.loopback_scope = stc.loopback_scope;
5914                 scp.ipv4_local_scope = stc.ipv4_scope;
5915                 scp.local_scope = stc.local_scope;
5916                 scp.site_scope = stc.site_scope;
5917                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5918         }
5919
5920         /* tack on the operational error if present */
5921         if (op_err) {
5922                 struct mbuf *ol;
5923                 int llen;
5924
5925                 llen = 0;
5926                 ol = op_err;
5927                 while (ol) {
5928                         llen += SCTP_BUF_LEN(ol);
5929                         ol = SCTP_BUF_NEXT(ol);
5930                 }
5931                 if (llen % 4) {
5932                         /* must add a pad to the param */
5933                         uint32_t cpthis = 0;
5934                         int padlen;
5935
5936                         padlen = 4 - (llen % 4);
5937                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5938                 }
5939                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5940                         m_at = SCTP_BUF_NEXT(m_at);
5941                 }
5942                 SCTP_BUF_NEXT(m_at) = op_err;
5943                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5944                         m_at = SCTP_BUF_NEXT(m_at);
5945                 }
5946         }
5947         /* pre-calulate the size and update pkt header and chunk header */
5948         p_len = 0;
5949         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5950                 p_len += SCTP_BUF_LEN(m_tmp);
5951                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5952                         /* m_tmp should now point to last one */
5953                         break;
5954                 }
5955         }
5956
5957         /* Now we must build a cookie */
5958         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5959         if (m_cookie == NULL) {
5960                 /* memory problem */
5961                 sctp_m_freem(m);
5962                 return;
5963         }
5964         /* Now append the cookie to the end and update the space/size */
5965         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5966
5967         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5968                 p_len += SCTP_BUF_LEN(m_tmp);
5969                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5970                         /* m_tmp should now point to last one */
5971                         mp_last = m_tmp;
5972                         break;
5973                 }
5974         }
5975         /*
5976          * Place in the size, but we don't include the last pad (if any) in
5977          * the INIT-ACK.
5978          */
5979         initack->ch.chunk_length = htons(p_len);
5980
5981         /*
5982          * Time to sign the cookie, we don't sign over the cookie signature
5983          * though thus we set trailer.
5984          */
5985         (void)sctp_hmac_m(SCTP_HMAC,
5986             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5987             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5988             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5989         /*
5990          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5991          * here since the timer will drive a retranmission.
5992          */
5993         padval = p_len % 4;
5994         if ((padval) && (mp_last)) {
5995                 /* see my previous comments on mp_last */
5996                 int ret;
5997
5998                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5999                 if (ret) {
6000                         /* Houston we have a problem, no space */
6001                         sctp_m_freem(m);
6002                         return;
6003                 }
6004                 p_len += padval;
6005         }
6006         if (stc.loopback_scope) {
6007                 over_addr = &store1;
6008         } else {
6009                 over_addr = NULL;
6010         }
6011
6012         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6013             0, NULL, 0,
6014             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6015             port, SCTP_SO_NOT_LOCKED, over_addr, init_pkt);
6016         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6017 }
6018
6019
6020 static void
6021 sctp_prune_prsctp(struct sctp_tcb *stcb,
6022     struct sctp_association *asoc,
6023     struct sctp_sndrcvinfo *srcv,
6024     int dataout)
6025 {
6026         int freed_spc = 0;
6027         struct sctp_tmit_chunk *chk, *nchk;
6028
6029         SCTP_TCB_LOCK_ASSERT(stcb);
6030         if ((asoc->peer_supports_prsctp) &&
6031             (asoc->sent_queue_cnt_removeable > 0)) {
6032                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6033                         /*
6034                          * Look for chunks marked with the PR_SCTP flag AND
6035                          * the buffer space flag. If the one being sent is
6036                          * equal or greater priority then purge the old one
6037                          * and free some space.
6038                          */
6039                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6040                                 /*
6041                                  * This one is PR-SCTP AND buffer space
6042                                  * limited type
6043                                  */
6044                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6045                                         /*
6046                                          * Lower numbers equates to higher
6047                                          * priority so if the one we are
6048                                          * looking at has a larger or equal
6049                                          * priority we want to drop the data
6050                                          * and NOT retransmit it.
6051                                          */
6052                                         if (chk->data) {
6053                                                 /*
6054                                                  * We release the book_size
6055                                                  * if the mbuf is here
6056                                                  */
6057                                                 int ret_spc;
6058                                                 int cause;
6059
6060                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6061                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
6062                                                 else
6063                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
6064                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6065                                                     cause,
6066                                                     SCTP_SO_LOCKED);
6067                                                 freed_spc += ret_spc;
6068                                                 if (freed_spc >= dataout) {
6069                                                         return;
6070                                                 }
6071                                         }       /* if chunk was present */
6072                                 }       /* if of sufficent priority */
6073                         }       /* if chunk has enabled */
6074                 }               /* tailqforeach */
6075
6076                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6077                         /* Here we must move to the sent queue and mark */
6078                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6079                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6080                                         if (chk->data) {
6081                                                 /*
6082                                                  * We release the book_size
6083                                                  * if the mbuf is here
6084                                                  */
6085                                                 int ret_spc;
6086
6087                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6088                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
6089                                                     SCTP_SO_LOCKED);
6090
6091                                                 freed_spc += ret_spc;
6092                                                 if (freed_spc >= dataout) {
6093                                                         return;
6094                                                 }
6095                                         }       /* end if chk->data */
6096                                 }       /* end if right class */
6097                         }       /* end if chk pr-sctp */
6098                 }               /* tailqforeachsafe (chk) */
6099         }                       /* if enabled in asoc */
6100 }
6101
6102 int
6103 sctp_get_frag_point(struct sctp_tcb *stcb,
6104     struct sctp_association *asoc)
6105 {
6106         int siz, ovh;
6107
6108         /*
6109          * For endpoints that have both v6 and v4 addresses we must reserve
6110          * room for the ipv6 header, for those that are only dealing with V4
6111          * we use a larger frag point.
6112          */
6113         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6114                 ovh = SCTP_MED_OVERHEAD;
6115         } else {
6116                 ovh = SCTP_MED_V4_OVERHEAD;
6117         }
6118
6119         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6120                 siz = asoc->smallest_mtu - ovh;
6121         else
6122                 siz = (stcb->asoc.sctp_frag_point - ovh);
6123         /*
6124          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6125          */
6126         /* A data chunk MUST fit in a cluster */
6127         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6128         /* } */
6129
6130         /* adjust for an AUTH chunk if DATA requires auth */
6131         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6132                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6133
6134         if (siz % 4) {
6135                 /* make it an even word boundary please */
6136                 siz -= (siz % 4);
6137         }
6138         return (siz);
6139 }
6140
6141 static void
6142 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6143 {
6144         sp->pr_sctp_on = 0;
6145         /*
6146          * We assume that the user wants PR_SCTP_TTL if the user provides a
6147          * positive lifetime but does not specify any PR_SCTP policy. This
6148          * is a BAD assumption and causes problems at least with the
6149          * U-Vancovers MPI folks. I will change this to be no policy means
6150          * NO PR-SCTP.
6151          */
6152         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6153                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6154                 sp->pr_sctp_on = 1;
6155         } else {
6156                 return;
6157         }
6158         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6159         case CHUNK_FLAGS_PR_SCTP_BUF:
6160                 /*
6161                  * Time to live is a priority stored in tv_sec when doing
6162                  * the buffer drop thing.
6163                  */
6164                 sp->ts.tv_sec = sp->timetolive;
6165                 sp->ts.tv_usec = 0;
6166                 break;
6167         case CHUNK_FLAGS_PR_SCTP_TTL:
6168                 {
6169                         struct timeval tv;
6170
6171                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6172                         tv.tv_sec = sp->timetolive / 1000;
6173                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6174                         /*
6175                          * TODO sctp_constants.h needs alternative time
6176                          * macros when _KERNEL is undefined.
6177                          */
6178                         timevaladd(&sp->ts, &tv);
6179                 }
6180                 break;
6181         case CHUNK_FLAGS_PR_SCTP_RTX:
6182                 /*
6183                  * Time to live is a the number or retransmissions stored in
6184                  * tv_sec.
6185                  */
6186                 sp->ts.tv_sec = sp->timetolive;
6187                 sp->ts.tv_usec = 0;
6188                 break;
6189         default:
6190                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6191                     "Unknown PR_SCTP policy %u.\n",
6192                     PR_SCTP_POLICY(sp->sinfo_flags));
6193                 break;
6194         }
6195 }
6196
6197 static int
6198 sctp_msg_append(struct sctp_tcb *stcb,
6199     struct sctp_nets *net,
6200     struct mbuf *m,
6201     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6202 {
6203         int error = 0, holds_lock;
6204         struct mbuf *at;
6205         struct sctp_stream_queue_pending *sp = NULL;
6206         struct sctp_stream_out *strm;
6207
6208         /*
6209          * Given an mbuf chain, put it into the association send queue and
6210          * place it on the wheel
6211          */
6212         holds_lock = hold_stcb_lock;
6213         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6214                 /* Invalid stream number */
6215                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6216                 error = EINVAL;
6217                 goto out_now;
6218         }
6219         if ((stcb->asoc.stream_locked) &&
6220             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6221                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6222                 error = EINVAL;
6223                 goto out_now;
6224         }
6225         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6226         /* Now can we send this? */
6227         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6228             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6229             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6230             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6231                 /* got data while shutting down */
6232                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6233                 error = ECONNRESET;
6234                 goto out_now;
6235         }
6236         sctp_alloc_a_strmoq(stcb, sp);
6237         if (sp == NULL) {
6238                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6239                 error = ENOMEM;
6240                 goto out_now;
6241         }
6242         sp->sinfo_flags = srcv->sinfo_flags;
6243         sp->timetolive = srcv->sinfo_timetolive;
6244         sp->ppid = srcv->sinfo_ppid;
6245         sp->context = srcv->sinfo_context;
6246         sp->strseq = 0;
6247         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6248                 sp->net = net;
6249                 atomic_add_int(&sp->net->ref_count, 1);
6250         } else {
6251                 sp->net = NULL;
6252         }
6253         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6254         sp->stream = srcv->sinfo_stream;
6255         sp->msg_is_complete = 1;
6256         sp->sender_all_done = 1;
6257         sp->some_taken = 0;
6258         sp->data = m;
6259         sp->tail_mbuf = NULL;
6260         sctp_set_prsctp_policy(sp);
6261         /*
6262          * We could in theory (for sendall) sifa the length in, but we would
6263          * still have to hunt through the chain since we need to setup the
6264          * tail_mbuf
6265          */
6266         sp->length = 0;
6267         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6268                 if (SCTP_BUF_NEXT(at) == NULL)
6269                         sp->tail_mbuf = at;
6270                 sp->length += SCTP_BUF_LEN(at);
6271         }
6272         if (srcv->sinfo_keynumber_valid) {
6273                 sp->auth_keyid = srcv->sinfo_keynumber;
6274         } else {
6275                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6276         }
6277         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6278                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6279                 sp->holds_key_ref = 1;
6280         }
6281         SCTP_TCB_SEND_LOCK(stcb);
6282         sctp_snd_sb_alloc(stcb, sp->length);
6283         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6284         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6285         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6286                 sp->strseq = strm->next_sequence_sent;
6287                 strm->next_sequence_sent++;
6288         }
6289         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6290         m = NULL;
6291         SCTP_TCB_SEND_UNLOCK(stcb);
6292 out_now:
6293         if (m) {
6294                 sctp_m_freem(m);
6295         }
6296         return (error);
6297 }
6298
6299
6300 static struct mbuf *
6301 sctp_copy_mbufchain(struct mbuf *clonechain,
6302     struct mbuf *outchain,
6303     struct mbuf **endofchain,
6304     int can_take_mbuf,
6305     int sizeofcpy,
6306     uint8_t copy_by_ref)
6307 {
6308         struct mbuf *m;
6309         struct mbuf *appendchain;
6310         caddr_t cp;
6311         int len;
6312
6313         if (endofchain == NULL) {
6314                 /* error */
6315 error_out:
6316                 if (outchain)
6317                         sctp_m_freem(outchain);
6318                 return (NULL);
6319         }
6320         if (can_take_mbuf) {
6321                 appendchain = clonechain;
6322         } else {
6323                 if (!copy_by_ref &&
6324                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6325                     ) {
6326                         /* Its not in a cluster */
6327                         if (*endofchain == NULL) {
6328                                 /* lets get a mbuf cluster */
6329                                 if (outchain == NULL) {
6330                                         /* This is the general case */
6331                         new_mbuf:
6332                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6333                                         if (outchain == NULL) {
6334                                                 goto error_out;
6335                                         }
6336                                         SCTP_BUF_LEN(outchain) = 0;
6337                                         *endofchain = outchain;
6338                                         /* get the prepend space */
6339                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6340                                 } else {
6341                                         /*
6342                                          * We really should not get a NULL
6343                                          * in endofchain
6344                                          */
6345                                         /* find end */
6346                                         m = outchain;
6347                                         while (m) {
6348                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6349                                                         *endofchain = m;
6350                                                         break;
6351                                                 }
6352                                                 m = SCTP_BUF_NEXT(m);
6353                                         }
6354                                         /* sanity */
6355                                         if (*endofchain == NULL) {
6356                                                 /*
6357                                                  * huh, TSNH XXX maybe we
6358                                                  * should panic
6359                                                  */
6360                                                 sctp_m_freem(outchain);
6361                                                 goto new_mbuf;
6362                                         }
6363                                 }
6364                                 /* get the new end of length */
6365                                 len = M_TRAILINGSPACE(*endofchain);
6366                         } else {
6367                                 /* how much is left at the end? */
6368                                 len = M_TRAILINGSPACE(*endofchain);
6369                         }
6370                         /* Find the end of the data, for appending */
6371                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6372
6373                         /* Now lets copy it out */
6374                         if (len >= sizeofcpy) {
6375                                 /* It all fits, copy it in */
6376                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6377                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6378                         } else {
6379                                 /* fill up the end of the chain */
6380                                 if (len > 0) {
6381                                         m_copydata(clonechain, 0, len, cp);
6382                                         SCTP_BUF_LEN((*endofchain)) += len;
6383                                         /* now we need another one */
6384                                         sizeofcpy -= len;
6385                                 }
6386                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6387                                 if (m == NULL) {
6388                                         /* We failed */
6389                                         goto error_out;
6390                                 }
6391                                 SCTP_BUF_NEXT((*endofchain)) = m;
6392                                 *endofchain = m;
6393                                 cp = mtod((*endofchain), caddr_t);
6394                                 m_copydata(clonechain, len, sizeofcpy, cp);
6395                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6396                         }
6397                         return (outchain);
6398                 } else {
6399                         /* copy the old fashion way */
6400                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6401 #ifdef SCTP_MBUF_LOGGING
6402                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6403                                 struct mbuf *mat;
6404
6405                                 mat = appendchain;
6406                                 while (mat) {
6407                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6408                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6409                                         }
6410                                         mat = SCTP_BUF_NEXT(mat);
6411                                 }
6412                         }
6413 #endif
6414                 }
6415         }
6416         if (appendchain == NULL) {
6417                 /* error */
6418                 if (outchain)
6419                         sctp_m_freem(outchain);
6420                 return (NULL);
6421         }
6422         if (outchain) {
6423                 /* tack on to the end */
6424                 if (*endofchain != NULL) {
6425                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6426                 } else {
6427                         m = outchain;
6428                         while (m) {
6429                                 if (SCTP_BUF_NEXT(m) == NULL) {
6430                                         SCTP_BUF_NEXT(m) = appendchain;
6431                                         break;
6432                                 }
6433                                 m = SCTP_BUF_NEXT(m);
6434                         }
6435                 }
6436                 /*
6437                  * save off the end and update the end-chain postion
6438                  */
6439                 m = appendchain;
6440                 while (m) {
6441                         if (SCTP_BUF_NEXT(m) == NULL) {
6442                                 *endofchain = m;
6443                                 break;
6444                         }
6445                         m = SCTP_BUF_NEXT(m);
6446                 }
6447                 return (outchain);
6448         } else {
6449                 /* save off the end and update the end-chain postion */
6450                 m = appendchain;
6451                 while (m) {
6452                         if (SCTP_BUF_NEXT(m) == NULL) {
6453                                 *endofchain = m;
6454                                 break;
6455                         }
6456                         m = SCTP_BUF_NEXT(m);
6457                 }
6458                 return (appendchain);
6459         }
6460 }
6461
6462 int
6463 sctp_med_chunk_output(struct sctp_inpcb *inp,
6464     struct sctp_tcb *stcb,
6465     struct sctp_association *asoc,
6466     int *num_out,
6467     int *reason_code,
6468     int control_only, int from_where,
6469     struct timeval *now, int *now_filled, int frag_point, int so_locked
6470 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6471     SCTP_UNUSED
6472 #endif
6473 );
6474
6475 static void
6476 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6477     uint32_t val)
6478 {
6479         struct sctp_copy_all *ca;
6480         struct mbuf *m;
6481         int ret = 0;
6482         int added_control = 0;
6483         int un_sent, do_chunk_output = 1;
6484         struct sctp_association *asoc;
6485         struct sctp_nets *net;
6486
6487         ca = (struct sctp_copy_all *)ptr;
6488         if (ca->m == NULL) {
6489                 return;
6490         }
6491         if (ca->inp != inp) {
6492                 /* TSNH */
6493                 return;
6494         }
6495         if ((ca->m) && ca->sndlen) {
6496                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6497                 if (m == NULL) {
6498                         /* can't copy so we are done */
6499                         ca->cnt_failed++;
6500                         return;
6501                 }
6502 #ifdef SCTP_MBUF_LOGGING
6503                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6504                         struct mbuf *mat;
6505
6506                         mat = m;
6507                         while (mat) {
6508                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6509                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6510                                 }
6511                                 mat = SCTP_BUF_NEXT(mat);
6512                         }
6513                 }
6514 #endif
6515         } else {
6516                 m = NULL;
6517         }
6518         SCTP_TCB_LOCK_ASSERT(stcb);
6519         if (stcb->asoc.alternate) {
6520                 net = stcb->asoc.alternate;
6521         } else {
6522                 net = stcb->asoc.primary_destination;
6523         }
6524         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6525                 /* Abort this assoc with m as the user defined reason */
6526                 if (m) {
6527                         struct sctp_paramhdr *ph;
6528
6529                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6530                         if (m) {
6531                                 ph = mtod(m, struct sctp_paramhdr *);
6532                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6533                                 ph->param_length = htons(ca->sndlen);
6534                         }
6535                         /*
6536                          * We add one here to keep the assoc from
6537                          * dis-appearing on us.
6538                          */
6539                         atomic_add_int(&stcb->asoc.refcnt, 1);
6540                         sctp_abort_an_association(inp, stcb,
6541                             SCTP_RESPONSE_TO_USER_REQ,
6542                             m, SCTP_SO_NOT_LOCKED);
6543                         /*
6544                          * sctp_abort_an_association calls sctp_free_asoc()
6545                          * free association will NOT free it since we
6546                          * incremented the refcnt .. we do this to prevent
6547                          * it being freed and things getting tricky since we
6548                          * could end up (from free_asoc) calling inpcb_free
6549                          * which would get a recursive lock call to the
6550                          * iterator lock.. But as a consequence of that the
6551                          * stcb will return to us un-locked.. since
6552                          * free_asoc returns with either no TCB or the TCB
6553                          * unlocked, we must relock.. to unlock in the
6554                          * iterator timer :-0
6555                          */
6556                         SCTP_TCB_LOCK(stcb);
6557                         atomic_add_int(&stcb->asoc.refcnt, -1);
6558                         goto no_chunk_output;
6559                 }
6560         } else {
6561                 if (m) {
6562                         ret = sctp_msg_append(stcb, net, m,
6563                             &ca->sndrcv, 1);
6564                 }
6565                 asoc = &stcb->asoc;
6566                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6567                         /* shutdown this assoc */
6568                         int cnt;
6569
6570                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6571
6572                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6573                             TAILQ_EMPTY(&asoc->sent_queue) &&
6574                             (cnt == 0)) {
6575                                 if (asoc->locked_on_sending) {
6576                                         goto abort_anyway;
6577                                 }
6578                                 /*
6579                                  * there is nothing queued to send, so I'm
6580                                  * done...
6581                                  */
6582                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6583                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6584                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6585                                         /*
6586                                          * only send SHUTDOWN the first time
6587                                          * through
6588                                          */
6589                                         sctp_send_shutdown(stcb, net);
6590                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6591                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6592                                         }
6593                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6594                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6595                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6596                                             net);
6597                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6598                                             asoc->primary_destination);
6599                                         added_control = 1;
6600                                         do_chunk_output = 0;
6601                                 }
6602                         } else {
6603                                 /*
6604                                  * we still got (or just got) data to send,
6605                                  * so set SHUTDOWN_PENDING
6606                                  */
6607                                 /*
6608                                  * XXX sockets draft says that SCTP_EOF
6609                                  * should be sent with no data.  currently,
6610                                  * we will allow user data to be sent first
6611                                  * and move to SHUTDOWN-PENDING
6612                                  */
6613                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6614                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6615                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6616                                         if (asoc->locked_on_sending) {
6617                                                 /*
6618                                                  * Locked to send out the
6619                                                  * data
6620                                                  */
6621                                                 struct sctp_stream_queue_pending *sp;
6622
6623                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6624                                                 if (sp) {
6625                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6626                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6627                                                 }
6628                                         }
6629                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6630                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6631                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6632                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6633                                 abort_anyway:
6634                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6635                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6636                                                     SCTP_RESPONSE_TO_USER_REQ,
6637                                                     NULL, SCTP_SO_NOT_LOCKED);
6638                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6639                                                 goto no_chunk_output;
6640                                         }
6641                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6642                                             asoc->primary_destination);
6643                                 }
6644                         }
6645
6646                 }
6647         }
6648         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6649             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6650
6651         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6652             (stcb->asoc.total_flight > 0) &&
6653             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6654             ) {
6655                 do_chunk_output = 0;
6656         }
6657         if (do_chunk_output)
6658                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6659         else if (added_control) {
6660                 int num_out = 0, reason = 0, now_filled = 0;
6661                 struct timeval now;
6662                 int frag_point;
6663
6664                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6665                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6666                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6667         }
6668 no_chunk_output:
6669         if (ret) {
6670                 ca->cnt_failed++;
6671         } else {
6672                 ca->cnt_sent++;
6673         }
6674 }
6675
6676 static void
6677 sctp_sendall_completes(void *ptr, uint32_t val)
6678 {
6679         struct sctp_copy_all *ca;
6680
6681         ca = (struct sctp_copy_all *)ptr;
6682         /*
6683          * Do a notify here? Kacheong suggests that the notify be done at
6684          * the send time.. so you would push up a notification if any send
6685          * failed. Don't know if this is feasable since the only failures we
6686          * have is "memory" related and if you cannot get an mbuf to send
6687          * the data you surely can't get an mbuf to send up to notify the
6688          * user you can't send the data :->
6689          */
6690
6691         /* now free everything */
6692         sctp_m_freem(ca->m);
6693         SCTP_FREE(ca, SCTP_M_COPYAL);
6694 }
6695
6696
6697 #define MC_ALIGN(m, len) do {                                           \
6698         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6699 } while (0)
6700
6701
6702
6703 static struct mbuf *
6704 sctp_copy_out_all(struct uio *uio, int len)
6705 {
6706         struct mbuf *ret, *at;
6707         int left, willcpy, cancpy, error;
6708
6709         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6710         if (ret == NULL) {
6711                 /* TSNH */
6712                 return (NULL);
6713         }
6714         left = len;
6715         SCTP_BUF_LEN(ret) = 0;
6716         /* save space for the data chunk header */
6717         cancpy = M_TRAILINGSPACE(ret);
6718         willcpy = min(cancpy, left);
6719         at = ret;
6720         while (left > 0) {
6721                 /* Align data to the end */
6722                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6723                 if (error) {
6724         err_out_now:
6725                         sctp_m_freem(at);
6726                         return (NULL);
6727                 }
6728                 SCTP_BUF_LEN(at) = willcpy;
6729                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6730                 left -= willcpy;
6731                 if (left > 0) {
6732                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6733                         if (SCTP_BUF_NEXT(at) == NULL) {
6734                                 goto err_out_now;
6735                         }
6736                         at = SCTP_BUF_NEXT(at);
6737                         SCTP_BUF_LEN(at) = 0;
6738                         cancpy = M_TRAILINGSPACE(at);
6739                         willcpy = min(cancpy, left);
6740                 }
6741         }
6742         return (ret);
6743 }
6744
6745 static int
6746 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6747     struct sctp_sndrcvinfo *srcv)
6748 {
6749         int ret;
6750         struct sctp_copy_all *ca;
6751
6752         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6753             SCTP_M_COPYAL);
6754         if (ca == NULL) {
6755                 sctp_m_freem(m);
6756                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6757                 return (ENOMEM);
6758         }
6759         memset(ca, 0, sizeof(struct sctp_copy_all));
6760
6761         ca->inp = inp;
6762         if (srcv) {
6763                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6764         }
6765         /*
6766          * take off the sendall flag, it would be bad if we failed to do
6767          * this :-0
6768          */
6769         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6770         /* get length and mbuf chain */
6771         if (uio) {
6772                 ca->sndlen = uio->uio_resid;
6773                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6774                 if (ca->m == NULL) {
6775                         SCTP_FREE(ca, SCTP_M_COPYAL);
6776                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6777                         return (ENOMEM);
6778                 }
6779         } else {
6780                 /* Gather the length of the send */
6781                 struct mbuf *mat;
6782
6783                 mat = m;
6784                 ca->sndlen = 0;
6785                 while (m) {
6786                         ca->sndlen += SCTP_BUF_LEN(m);
6787                         m = SCTP_BUF_NEXT(m);
6788                 }
6789                 ca->m = mat;
6790         }
6791         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6792             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6793             SCTP_ASOC_ANY_STATE,
6794             (void *)ca, 0,
6795             sctp_sendall_completes, inp, 1);
6796         if (ret) {
6797                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6798                 SCTP_FREE(ca, SCTP_M_COPYAL);
6799                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6800                 return (EFAULT);
6801         }
6802         return (0);
6803 }
6804
6805
6806 void
6807 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6808 {
6809         struct sctp_tmit_chunk *chk, *nchk;
6810
6811         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6812                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6813                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6814                         if (chk->data) {
6815                                 sctp_m_freem(chk->data);
6816                                 chk->data = NULL;
6817                         }
6818                         asoc->ctrl_queue_cnt--;
6819                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6820                 }
6821         }
6822 }
6823
6824 void
6825 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6826 {
6827         struct sctp_association *asoc;
6828         struct sctp_tmit_chunk *chk, *nchk;
6829         struct sctp_asconf_chunk *acp;
6830
6831         asoc = &stcb->asoc;
6832         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6833                 /* find SCTP_ASCONF chunk in queue */
6834                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6835                         if (chk->data) {
6836                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6837                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6838                                         /* Not Acked yet */
6839                                         break;
6840                                 }
6841                         }
6842                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6843                         if (chk->data) {
6844                                 sctp_m_freem(chk->data);
6845                                 chk->data = NULL;
6846                         }
6847                         asoc->ctrl_queue_cnt--;
6848                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6849                 }
6850         }
6851 }
6852
6853
6854 static void
6855 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6856     struct sctp_association *asoc,
6857     struct sctp_tmit_chunk **data_list,
6858     int bundle_at,
6859     struct sctp_nets *net)
6860 {
6861         int i;
6862         struct sctp_tmit_chunk *tp1;
6863
6864         for (i = 0; i < bundle_at; i++) {
6865                 /* off of the send queue */
6866                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6867                 asoc->send_queue_cnt--;
6868                 if (i > 0) {
6869                         /*
6870                          * Any chunk NOT 0 you zap the time chunk 0 gets
6871                          * zapped or set based on if a RTO measurment is
6872                          * needed.
6873                          */
6874                         data_list[i]->do_rtt = 0;
6875                 }
6876                 /* record time */
6877                 data_list[i]->sent_rcv_time = net->last_sent_time;
6878                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6879                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6880                 if (data_list[i]->whoTo == NULL) {
6881                         data_list[i]->whoTo = net;
6882                         atomic_add_int(&net->ref_count, 1);
6883                 }
6884                 /* on to the sent queue */
6885                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6886                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6887                         struct sctp_tmit_chunk *tpp;
6888
6889                         /* need to move back */
6890         back_up_more:
6891                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6892                         if (tpp == NULL) {
6893                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6894                                 goto all_done;
6895                         }
6896                         tp1 = tpp;
6897                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6898                                 goto back_up_more;
6899                         }
6900                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6901                 } else {
6902                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6903                             data_list[i],
6904                             sctp_next);
6905                 }
6906 all_done:
6907                 /* This does not lower until the cum-ack passes it */
6908                 asoc->sent_queue_cnt++;
6909                 if ((asoc->peers_rwnd <= 0) &&
6910                     (asoc->total_flight == 0) &&
6911                     (bundle_at == 1)) {
6912                         /* Mark the chunk as being a window probe */
6913                         SCTP_STAT_INCR(sctps_windowprobed);
6914                 }
6915 #ifdef SCTP_AUDITING_ENABLED
6916                 sctp_audit_log(0xC2, 3);
6917 #endif
6918                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6919                 data_list[i]->snd_count = 1;
6920                 data_list[i]->rec.data.chunk_was_revoked = 0;
6921                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6922                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6923                             data_list[i]->whoTo->flight_size,
6924                             data_list[i]->book_size,
6925                             (uintptr_t) data_list[i]->whoTo,
6926                             data_list[i]->rec.data.TSN_seq);
6927                 }
6928                 sctp_flight_size_increase(data_list[i]);
6929                 sctp_total_flight_increase(stcb, data_list[i]);
6930                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6931                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6932                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6933                 }
6934                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6935                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6936                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6937                         /* SWS sender side engages */
6938                         asoc->peers_rwnd = 0;
6939                 }
6940         }
6941         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6942                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6943         }
6944 }
6945
6946 static void
6947 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6948 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6949     SCTP_UNUSED
6950 #endif
6951 )
6952 {
6953         struct sctp_tmit_chunk *chk, *nchk;
6954
6955         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6956                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6957                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6958                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6959                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6960                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6961                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6962                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6963                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6964                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6965                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6966                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6967                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6968                         /* Stray chunks must be cleaned up */
6969         clean_up_anyway:
6970                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6971                         if (chk->data) {
6972                                 sctp_m_freem(chk->data);
6973                                 chk->data = NULL;
6974                         }
6975                         asoc->ctrl_queue_cnt--;
6976                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6977                                 asoc->fwd_tsn_cnt--;
6978                         sctp_free_a_chunk(stcb, chk, so_locked);
6979                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6980                         /* special handling, we must look into the param */
6981                         if (chk != asoc->str_reset) {
6982                                 goto clean_up_anyway;
6983                         }
6984                 }
6985         }
6986 }
6987
6988
6989 static int
6990 sctp_can_we_split_this(struct sctp_tcb *stcb,
6991     uint32_t length,
6992     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6993 {
6994         /*
6995          * Make a decision on if I should split a msg into multiple parts.
6996          * This is only asked of incomplete messages.
6997          */
6998         if (eeor_on) {
6999                 /*
7000                  * If we are doing EEOR we need to always send it if its the
7001                  * entire thing, since it might be all the guy is putting in
7002                  * the hopper.
7003                  */
7004                 if (goal_mtu >= length) {
7005                         /*-
7006                          * If we have data outstanding,
7007                          * we get another chance when the sack
7008                          * arrives to transmit - wait for more data
7009                          */
7010                         if (stcb->asoc.total_flight == 0) {
7011                                 /*
7012                                  * If nothing is in flight, we zero the
7013                                  * packet counter.
7014                                  */
7015                                 return (length);
7016                         }
7017                         return (0);
7018
7019                 } else {
7020                         /* You can fill the rest */
7021                         return (goal_mtu);
7022                 }
7023         }
7024         /*-
7025          * For those strange folk that make the send buffer
7026          * smaller than our fragmentation point, we can't
7027          * get a full msg in so we have to allow splitting.
7028          */
7029         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7030                 return (length);
7031         }
7032         if ((length <= goal_mtu) ||
7033             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7034                 /* Sub-optimial residual don't split in non-eeor mode. */
7035                 return (0);
7036         }
7037         /*
7038          * If we reach here length is larger than the goal_mtu. Do we wish
7039          * to split it for the sake of packet putting together?
7040          */
7041         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7042                 /* Its ok to split it */
7043                 return (min(goal_mtu, frag_point));
7044         }
7045         /* Nope, can't split */
7046         return (0);
7047
7048 }
7049
7050 static uint32_t
7051 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7052     struct sctp_stream_out *strq,
7053     uint32_t goal_mtu,
7054     uint32_t frag_point,
7055     int *locked,
7056     int *giveup,
7057     int eeor_mode,
7058     int *bail,
7059     int so_locked
7060 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7061     SCTP_UNUSED
7062 #endif
7063 )
7064 {
7065         /* Move from the stream to the send_queue keeping track of the total */
7066         struct sctp_association *asoc;
7067         struct sctp_stream_queue_pending *sp;
7068         struct sctp_tmit_chunk *chk;
7069         struct sctp_data_chunk *dchkh;
7070         uint32_t to_move, length;
7071         uint8_t rcv_flags = 0;
7072         uint8_t some_taken;
7073         uint8_t send_lock_up = 0;
7074
7075         SCTP_TCB_LOCK_ASSERT(stcb);
7076         asoc = &stcb->asoc;
7077 one_more_time:
7078         /* sa_ignore FREED_MEMORY */
7079         sp = TAILQ_FIRST(&strq->outqueue);
7080         if (sp == NULL) {
7081                 *locked = 0;
7082                 if (send_lock_up == 0) {
7083                         SCTP_TCB_SEND_LOCK(stcb);
7084                         send_lock_up = 1;
7085                 }
7086                 sp = TAILQ_FIRST(&strq->outqueue);
7087                 if (sp) {
7088                         goto one_more_time;
7089                 }
7090                 if (strq->last_msg_incomplete) {
7091                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7092                             strq->stream_no,
7093                             strq->last_msg_incomplete);
7094                         strq->last_msg_incomplete = 0;
7095                 }
7096                 to_move = 0;
7097                 if (send_lock_up) {
7098                         SCTP_TCB_SEND_UNLOCK(stcb);
7099                         send_lock_up = 0;
7100                 }
7101                 goto out_of;
7102         }
7103         if ((sp->msg_is_complete) && (sp->length == 0)) {
7104                 if (sp->sender_all_done) {
7105                         /*
7106                          * We are doing differed cleanup. Last time through
7107                          * when we took all the data the sender_all_done was
7108                          * not set.
7109                          */
7110                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7111                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7112                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7113                                     sp->sender_all_done,
7114                                     sp->length,
7115                                     sp->msg_is_complete,
7116                                     sp->put_last_out,
7117                                     send_lock_up);
7118                         }
7119                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7120                                 SCTP_TCB_SEND_LOCK(stcb);
7121                                 send_lock_up = 1;
7122                         }
7123                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7124                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7125                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7126                         if (sp->net) {
7127                                 sctp_free_remote_addr(sp->net);
7128                                 sp->net = NULL;
7129                         }
7130                         if (sp->data) {
7131                                 sctp_m_freem(sp->data);
7132                                 sp->data = NULL;
7133                         }
7134                         sctp_free_a_strmoq(stcb, sp, so_locked);
7135                         /* we can't be locked to it */
7136                         *locked = 0;
7137                         stcb->asoc.locked_on_sending = NULL;
7138                         if (send_lock_up) {
7139                                 SCTP_TCB_SEND_UNLOCK(stcb);
7140                                 send_lock_up = 0;
7141                         }
7142                         /* back to get the next msg */
7143                         goto one_more_time;
7144                 } else {
7145                         /*
7146                          * sender just finished this but still holds a
7147                          * reference
7148                          */
7149                         *locked = 1;
7150                         *giveup = 1;
7151                         to_move = 0;
7152                         goto out_of;
7153                 }
7154         } else {
7155                 /* is there some to get */
7156                 if (sp->length == 0) {
7157                         /* no */
7158                         *locked = 1;
7159                         *giveup = 1;
7160                         to_move = 0;
7161                         goto out_of;
7162                 } else if (sp->discard_rest) {
7163                         if (send_lock_up == 0) {
7164                                 SCTP_TCB_SEND_LOCK(stcb);
7165                                 send_lock_up = 1;
7166                         }
7167                         /* Whack down the size */
7168                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7169                         if ((stcb->sctp_socket != NULL) && \
7170                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7171                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7172                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7173                         }
7174                         if (sp->data) {
7175                                 sctp_m_freem(sp->data);
7176                                 sp->data = NULL;
7177                                 sp->tail_mbuf = NULL;
7178                         }
7179                         sp->length = 0;
7180                         sp->some_taken = 1;
7181                         *locked = 1;
7182                         *giveup = 1;
7183                         to_move = 0;
7184                         goto out_of;
7185                 }
7186         }
7187         some_taken = sp->some_taken;
7188         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7189                 sp->msg_is_complete = 1;
7190         }
7191 re_look:
7192         length = sp->length;
7193         if (sp->msg_is_complete) {
7194                 /* The message is complete */
7195                 to_move = min(length, frag_point);
7196                 if (to_move == length) {
7197                         /* All of it fits in the MTU */
7198                         if (sp->some_taken) {
7199                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7200                                 sp->put_last_out = 1;
7201                         } else {
7202                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7203                                 sp->put_last_out = 1;
7204                         }
7205                 } else {
7206                         /* Not all of it fits, we fragment */
7207                         if (sp->some_taken == 0) {
7208                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7209                         }
7210                         sp->some_taken = 1;
7211                 }
7212         } else {
7213                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7214                 if (to_move) {
7215                         /*-
7216                          * We use a snapshot of length in case it
7217                          * is expanding during the compare.
7218                          */
7219                         uint32_t llen;
7220
7221                         llen = length;
7222                         if (to_move >= llen) {
7223                                 to_move = llen;
7224                                 if (send_lock_up == 0) {
7225                                         /*-
7226                                          * We are taking all of an incomplete msg
7227                                          * thus we need a send lock.
7228                                          */
7229                                         SCTP_TCB_SEND_LOCK(stcb);
7230                                         send_lock_up = 1;
7231                                         if (sp->msg_is_complete) {
7232                                                 /*
7233                                                  * the sender finished the
7234                                                  * msg
7235                                                  */
7236                                                 goto re_look;
7237                                         }
7238                                 }
7239                         }
7240                         if (sp->some_taken == 0) {
7241                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7242                                 sp->some_taken = 1;
7243                         }
7244                 } else {
7245                         /* Nothing to take. */
7246                         if (sp->some_taken) {
7247                                 *locked = 1;
7248                         }
7249                         *giveup = 1;
7250                         to_move = 0;
7251                         goto out_of;
7252                 }
7253         }
7254
7255         /* If we reach here, we can copy out a chunk */
7256         sctp_alloc_a_chunk(stcb, chk);
7257         if (chk == NULL) {
7258                 /* No chunk memory */
7259                 *giveup = 1;
7260                 to_move = 0;
7261                 goto out_of;
7262         }
7263         /*
7264          * Setup for unordered if needed by looking at the user sent info
7265          * flags.
7266          */
7267         if (sp->sinfo_flags & SCTP_UNORDERED) {
7268                 rcv_flags |= SCTP_DATA_UNORDERED;
7269         }
7270         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7271             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7272                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7273         }
7274         /* clear out the chunk before setting up */
7275         memset(chk, 0, sizeof(*chk));
7276         chk->rec.data.rcv_flags = rcv_flags;
7277
7278         if (to_move >= length) {
7279                 /* we think we can steal the whole thing */
7280                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7281                         SCTP_TCB_SEND_LOCK(stcb);
7282                         send_lock_up = 1;
7283                 }
7284                 if (to_move < sp->length) {
7285                         /* bail, it changed */
7286                         goto dont_do_it;
7287                 }
7288                 chk->data = sp->data;
7289                 chk->last_mbuf = sp->tail_mbuf;
7290                 /* register the stealing */
7291                 sp->data = sp->tail_mbuf = NULL;
7292         } else {
7293                 struct mbuf *m;
7294
7295 dont_do_it:
7296                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7297                 chk->last_mbuf = NULL;
7298                 if (chk->data == NULL) {
7299                         sp->some_taken = some_taken;
7300                         sctp_free_a_chunk(stcb, chk, so_locked);
7301                         *bail = 1;
7302                         to_move = 0;
7303                         goto out_of;
7304                 }
7305 #ifdef SCTP_MBUF_LOGGING
7306                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7307                         struct mbuf *mat;
7308
7309                         mat = chk->data;
7310                         while (mat) {
7311                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7312                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7313                                 }
7314                                 mat = SCTP_BUF_NEXT(mat);
7315                         }
7316                 }
7317 #endif
7318                 /* Pull off the data */
7319                 m_adj(sp->data, to_move);
7320                 /* Now lets work our way down and compact it */
7321                 m = sp->data;
7322                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7323                         sp->data = SCTP_BUF_NEXT(m);
7324                         SCTP_BUF_NEXT(m) = NULL;
7325                         if (sp->tail_mbuf == m) {
7326                                 /*-
7327                                  * Freeing tail? TSNH since
7328                                  * we supposedly were taking less
7329                                  * than the sp->length.
7330                                  */
7331 #ifdef INVARIANTS
7332                                 panic("Huh, freing tail? - TSNH");
7333 #else
7334                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7335                                 sp->tail_mbuf = sp->data = NULL;
7336                                 sp->length = 0;
7337 #endif
7338
7339                         }
7340                         sctp_m_free(m);
7341                         m = sp->data;
7342                 }
7343         }
7344         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7345                 chk->copy_by_ref = 1;
7346         } else {
7347                 chk->copy_by_ref = 0;
7348         }
7349         /*
7350          * get last_mbuf and counts of mb useage This is ugly but hopefully
7351          * its only one mbuf.
7352          */
7353         if (chk->last_mbuf == NULL) {
7354                 chk->last_mbuf = chk->data;
7355                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7356                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7357                 }
7358         }
7359         if (to_move > length) {
7360                 /*- This should not happen either
7361                  * since we always lower to_move to the size
7362                  * of sp->length if its larger.
7363                  */
7364 #ifdef INVARIANTS
7365                 panic("Huh, how can to_move be larger?");
7366 #else
7367                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7368                 sp->length = 0;
7369 #endif
7370         } else {
7371                 atomic_subtract_int(&sp->length, to_move);
7372         }
7373         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7374                 /* Not enough room for a chunk header, get some */
7375                 struct mbuf *m;
7376
7377                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7378                 if (m == NULL) {
7379                         /*
7380                          * we're in trouble here. _PREPEND below will free
7381                          * all the data if there is no leading space, so we
7382                          * must put the data back and restore.
7383                          */
7384                         if (send_lock_up == 0) {
7385                                 SCTP_TCB_SEND_LOCK(stcb);
7386                                 send_lock_up = 1;
7387                         }
7388                         if (chk->data == NULL) {
7389                                 /* unsteal the data */
7390                                 sp->data = chk->data;
7391                                 sp->tail_mbuf = chk->last_mbuf;
7392                         } else {
7393                                 struct mbuf *m_tmp;
7394
7395                                 /* reassemble the data */
7396                                 m_tmp = sp->data;
7397                                 sp->data = chk->data;
7398                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7399                         }
7400                         sp->some_taken = some_taken;
7401                         atomic_add_int(&sp->length, to_move);
7402                         chk->data = NULL;
7403                         *bail = 1;
7404                         sctp_free_a_chunk(stcb, chk, so_locked);
7405                         to_move = 0;
7406                         goto out_of;
7407                 } else {
7408                         SCTP_BUF_LEN(m) = 0;
7409                         SCTP_BUF_NEXT(m) = chk->data;
7410                         chk->data = m;
7411                         M_ALIGN(chk->data, 4);
7412                 }
7413         }
7414         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7415         if (chk->data == NULL) {
7416                 /* HELP, TSNH since we assured it would not above? */
7417 #ifdef INVARIANTS
7418                 panic("prepend failes HELP?");
7419 #else
7420                 SCTP_PRINTF("prepend fails HELP?\n");
7421                 sctp_free_a_chunk(stcb, chk, so_locked);
7422 #endif
7423                 *bail = 1;
7424                 to_move = 0;
7425                 goto out_of;
7426         }
7427         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7428         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7429         chk->book_size_scale = 0;
7430         chk->sent = SCTP_DATAGRAM_UNSENT;
7431
7432         chk->flags = 0;
7433         chk->asoc = &stcb->asoc;
7434         chk->pad_inplace = 0;
7435         chk->no_fr_allowed = 0;
7436         chk->rec.data.stream_seq = sp->strseq;
7437         chk->rec.data.stream_number = sp->stream;
7438         chk->rec.data.payloadtype = sp->ppid;
7439         chk->rec.data.context = sp->context;
7440         chk->rec.data.doing_fast_retransmit = 0;
7441
7442         chk->rec.data.timetodrop = sp->ts;
7443         chk->flags = sp->act_flags;
7444
7445         if (sp->net) {
7446                 chk->whoTo = sp->net;
7447                 atomic_add_int(&chk->whoTo->ref_count, 1);
7448         } else
7449                 chk->whoTo = NULL;
7450
7451         if (sp->holds_key_ref) {
7452                 chk->auth_keyid = sp->auth_keyid;
7453                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7454                 chk->holds_key_ref = 1;
7455         }
7456         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7457         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7458                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7459                     (uintptr_t) stcb, sp->length,
7460                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7461                     chk->rec.data.TSN_seq);
7462         }
7463         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7464         /*
7465          * Put the rest of the things in place now. Size was done earlier in
7466          * previous loop prior to padding.
7467          */
7468
7469 #ifdef SCTP_ASOCLOG_OF_TSNS
7470         SCTP_TCB_LOCK_ASSERT(stcb);
7471         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7472                 asoc->tsn_out_at = 0;
7473                 asoc->tsn_out_wrapped = 1;
7474         }
7475         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7476         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7477         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7478         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7479         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7480         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7481         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7482         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7483         asoc->tsn_out_at++;
7484 #endif
7485
7486         dchkh->ch.chunk_type = SCTP_DATA;
7487         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7488         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7489         dchkh->dp.stream_id = htons(strq->stream_no);
7490         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7491         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7492         dchkh->ch.chunk_length = htons(chk->send_size);
7493         /* Now advance the chk->send_size by the actual pad needed. */
7494         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7495                 /* need a pad */
7496                 struct mbuf *lm;
7497                 int pads;
7498
7499                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7500                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7501                         chk->pad_inplace = 1;
7502                 }
7503                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7504                         /* pad added an mbuf */
7505                         chk->last_mbuf = lm;
7506                 }
7507                 chk->send_size += pads;
7508         }
7509         /* We only re-set the policy if it is on */
7510         if (sp->pr_sctp_on) {
7511                 sctp_set_prsctp_policy(sp);
7512                 asoc->pr_sctp_cnt++;
7513                 chk->pr_sctp_on = 1;
7514         } else {
7515                 chk->pr_sctp_on = 0;
7516         }
7517         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7518                 /* All done pull and kill the message */
7519                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7520                 if (sp->put_last_out == 0) {
7521                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7522                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7523                             sp->sender_all_done,
7524                             sp->length,
7525                             sp->msg_is_complete,
7526                             sp->put_last_out,
7527                             send_lock_up);
7528                 }
7529                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7530                         SCTP_TCB_SEND_LOCK(stcb);
7531                         send_lock_up = 1;
7532                 }
7533                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7534                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7535                 if (sp->net) {
7536                         sctp_free_remote_addr(sp->net);
7537                         sp->net = NULL;
7538                 }
7539                 if (sp->data) {
7540                         sctp_m_freem(sp->data);
7541                         sp->data = NULL;
7542                 }
7543                 sctp_free_a_strmoq(stcb, sp, so_locked);
7544
7545                 /* we can't be locked to it */
7546                 *locked = 0;
7547                 stcb->asoc.locked_on_sending = NULL;
7548         } else {
7549                 /* more to go, we are locked */
7550                 *locked = 1;
7551         }
7552         asoc->chunks_on_out_queue++;
7553         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7554         asoc->send_queue_cnt++;
7555 out_of:
7556         if (send_lock_up) {
7557                 SCTP_TCB_SEND_UNLOCK(stcb);
7558                 send_lock_up = 0;
7559         }
7560         return (to_move);
7561 }
7562
7563
7564 static void
7565 sctp_fill_outqueue(struct sctp_tcb *stcb,
7566     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7567 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7568     SCTP_UNUSED
7569 #endif
7570 )
7571 {
7572         struct sctp_association *asoc;
7573         struct sctp_stream_out *strq, *strqn;
7574         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7575         int locked, giveup;
7576
7577         SCTP_TCB_LOCK_ASSERT(stcb);
7578         asoc = &stcb->asoc;
7579 #ifdef INET6
7580         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7581                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7582         } else {
7583                 /* ?? not sure what else to do */
7584                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7585         }
7586 #else
7587         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7588 #endif
7589         /* Need an allowance for the data chunk header too */
7590         goal_mtu -= sizeof(struct sctp_data_chunk);
7591
7592         /* must make even word boundary */
7593         goal_mtu &= 0xfffffffc;
7594         if (asoc->locked_on_sending) {
7595                 /* We are stuck on one stream until the message completes. */
7596                 strq = asoc->locked_on_sending;
7597                 locked = 1;
7598         } else {
7599                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7600                 locked = 0;
7601         }
7602         strqn = strq;
7603         while ((goal_mtu > 0) && strq) {
7604                 giveup = 0;
7605                 bail = 0;
7606                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7607                     &giveup, eeor_mode, &bail, so_locked);
7608                 if (moved_how_much)
7609                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7610
7611                 if (locked) {
7612                         asoc->locked_on_sending = strq;
7613                         if ((moved_how_much == 0) || (giveup) || bail)
7614                                 /* no more to move for now */
7615                                 break;
7616                 } else {
7617                         asoc->locked_on_sending = NULL;
7618                         if ((giveup) || bail) {
7619                                 break;
7620                         }
7621                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7622                         if (strq == NULL) {
7623                                 break;
7624                         }
7625                 }
7626                 total_moved += moved_how_much;
7627                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7628                 goal_mtu &= 0xfffffffc;
7629         }
7630         if (bail)
7631                 *quit_now = 1;
7632
7633         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7634
7635         if (total_moved == 0) {
7636                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7637                     (net == stcb->asoc.primary_destination)) {
7638                         /* ran dry for primary network net */
7639                         SCTP_STAT_INCR(sctps_primary_randry);
7640                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7641                         /* ran dry with CMT on */
7642                         SCTP_STAT_INCR(sctps_cmt_randry);
7643                 }
7644         }
7645 }
7646
7647 void
7648 sctp_fix_ecn_echo(struct sctp_association *asoc)
7649 {
7650         struct sctp_tmit_chunk *chk;
7651
7652         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7653                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7654                         chk->sent = SCTP_DATAGRAM_UNSENT;
7655                 }
7656         }
7657 }
7658
7659 void
7660 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7661 {
7662         struct sctp_association *asoc;
7663         struct sctp_tmit_chunk *chk;
7664         struct sctp_stream_queue_pending *sp;
7665         unsigned int i;
7666
7667         if (net == NULL) {
7668                 return;
7669         }
7670         asoc = &stcb->asoc;
7671         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7672                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7673                         if (sp->net == net) {
7674                                 sctp_free_remote_addr(sp->net);
7675                                 sp->net = NULL;
7676                         }
7677                 }
7678         }
7679         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7680                 if (chk->whoTo == net) {
7681                         sctp_free_remote_addr(chk->whoTo);
7682                         chk->whoTo = NULL;
7683                 }
7684         }
7685 }
7686
7687 int
7688 sctp_med_chunk_output(struct sctp_inpcb *inp,
7689     struct sctp_tcb *stcb,
7690     struct sctp_association *asoc,
7691     int *num_out,
7692     int *reason_code,
7693     int control_only, int from_where,
7694     struct timeval *now, int *now_filled, int frag_point, int so_locked
7695 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7696     SCTP_UNUSED
7697 #endif
7698 )
7699 {
7700         /*
7701          * Ok this is the generic chunk service queue. we must do the
7702          * following: - Service the stream queue that is next, moving any
7703          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7704          * LAST to the out queue in one pass) and assigning TSN's - Check to
7705          * see if the cwnd/rwnd allows any output, if so we go ahead and
7706          * fomulate and send the low level chunks. Making sure to combine
7707          * any control in the control chunk queue also.
7708          */
7709         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7710         struct mbuf *outchain, *endoutchain;
7711         struct sctp_tmit_chunk *chk, *nchk;
7712
7713         /* temp arrays for unlinking */
7714         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7715         int no_fragmentflg, error;
7716         unsigned int max_rwnd_per_dest, max_send_per_dest;
7717         int one_chunk, hbflag, skip_data_for_this_net;
7718         int asconf, cookie, no_out_cnt;
7719         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7720         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7721         int tsns_sent = 0;
7722         uint32_t auth_offset = 0;
7723         struct sctp_auth_chunk *auth = NULL;
7724         uint16_t auth_keyid;
7725         int override_ok = 1;
7726         int skip_fill_up = 0;
7727         int data_auth_reqd = 0;
7728
7729         /*
7730          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7731          * destination.
7732          */
7733         int quit_now = 0;
7734
7735         *num_out = 0;
7736         auth_keyid = stcb->asoc.authinfo.active_keyid;
7737
7738         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7739             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7740             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7741                 eeor_mode = 1;
7742         } else {
7743                 eeor_mode = 0;
7744         }
7745         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7746         /*
7747          * First lets prime the pump. For each destination, if there is room
7748          * in the flight size, attempt to pull an MTU's worth out of the
7749          * stream queues into the general send_queue
7750          */
7751 #ifdef SCTP_AUDITING_ENABLED
7752         sctp_audit_log(0xC2, 2);
7753 #endif
7754         SCTP_TCB_LOCK_ASSERT(stcb);
7755         hbflag = 0;
7756         if ((control_only) || (asoc->stream_reset_outstanding))
7757                 no_data_chunks = 1;
7758         else
7759                 no_data_chunks = 0;
7760
7761         /* Nothing to possible to send? */
7762         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7763             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7764             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7765             TAILQ_EMPTY(&asoc->send_queue) &&
7766             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7767 nothing_to_send:
7768                 *reason_code = 9;
7769                 return (0);
7770         }
7771         if (asoc->peers_rwnd == 0) {
7772                 /* No room in peers rwnd */
7773                 *reason_code = 1;
7774                 if (asoc->total_flight > 0) {
7775                         /* we are allowed one chunk in flight */
7776                         no_data_chunks = 1;
7777                 }
7778         }
7779         if (stcb->asoc.ecn_echo_cnt_onq) {
7780                 /* Record where a sack goes, if any */
7781                 if (no_data_chunks &&
7782                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7783                         /* Nothing but ECNe to send - we don't do that */
7784                         goto nothing_to_send;
7785                 }
7786                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7787                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7788                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7789                                 sack_goes_to = chk->whoTo;
7790                                 break;
7791                         }
7792                 }
7793         }
7794         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7795         if (stcb->sctp_socket)
7796                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7797         else
7798                 max_send_per_dest = 0;
7799         if (no_data_chunks == 0) {
7800                 /* How many non-directed chunks are there? */
7801                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7802                         if (chk->whoTo == NULL) {
7803                                 /*
7804                                  * We already have non-directed chunks on
7805                                  * the queue, no need to do a fill-up.
7806                                  */
7807                                 skip_fill_up = 1;
7808                                 break;
7809                         }
7810                 }
7811
7812         }
7813         if ((no_data_chunks == 0) &&
7814             (skip_fill_up == 0) &&
7815             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7816                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7817                         /*
7818                          * This for loop we are in takes in each net, if
7819                          * its's got space in cwnd and has data sent to it
7820                          * (when CMT is off) then it calls
7821                          * sctp_fill_outqueue for the net. This gets data on
7822                          * the send queue for that network.
7823                          *
7824                          * In sctp_fill_outqueue TSN's are assigned and data is
7825                          * copied out of the stream buffers. Note mostly
7826                          * copy by reference (we hope).
7827                          */
7828                         net->window_probe = 0;
7829                         if ((net != stcb->asoc.alternate) &&
7830                             ((net->dest_state & SCTP_ADDR_PF) ||
7831                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7832                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7833                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7834                                         sctp_log_cwnd(stcb, net, 1,
7835                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7836                                 }
7837                                 continue;
7838                         }
7839                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7840                             (net->flight_size == 0)) {
7841                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7842                         }
7843                         if (net->flight_size >= net->cwnd) {
7844                                 /* skip this network, no room - can't fill */
7845                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7846                                         sctp_log_cwnd(stcb, net, 3,
7847                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7848                                 }
7849                                 continue;
7850                         }
7851                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7852                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7853                         }
7854                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7855                         if (quit_now) {
7856                                 /* memory alloc failure */
7857                                 no_data_chunks = 1;
7858                                 break;
7859                         }
7860                 }
7861         }
7862         /* now service each destination and send out what we can for it */
7863         /* Nothing to send? */
7864         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7865             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7866             TAILQ_EMPTY(&asoc->send_queue)) {
7867                 *reason_code = 8;
7868                 return (0);
7869         }
7870         if (asoc->sctp_cmt_on_off > 0) {
7871                 /* get the last start point */
7872                 start_at = asoc->last_net_cmt_send_started;
7873                 if (start_at == NULL) {
7874                         /* null so to beginning */
7875                         start_at = TAILQ_FIRST(&asoc->nets);
7876                 } else {
7877                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7878                         if (start_at == NULL) {
7879                                 start_at = TAILQ_FIRST(&asoc->nets);
7880                         }
7881                 }
7882                 asoc->last_net_cmt_send_started = start_at;
7883         } else {
7884                 start_at = TAILQ_FIRST(&asoc->nets);
7885         }
7886         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7887                 if (chk->whoTo == NULL) {
7888                         if (asoc->alternate) {
7889                                 chk->whoTo = asoc->alternate;
7890                         } else {
7891                                 chk->whoTo = asoc->primary_destination;
7892                         }
7893                         atomic_add_int(&chk->whoTo->ref_count, 1);
7894                 }
7895         }
7896         old_start_at = NULL;
7897 again_one_more_time:
7898         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7899                 /* how much can we send? */
7900                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7901                 if (old_start_at && (old_start_at == net)) {
7902                         /* through list ocmpletely. */
7903                         break;
7904                 }
7905                 tsns_sent = 0xa;
7906                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7907                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7908                     (net->flight_size >= net->cwnd)) {
7909                         /*
7910                          * Nothing on control or asconf and flight is full,
7911                          * we can skip even in the CMT case.
7912                          */
7913                         continue;
7914                 }
7915                 ctl_cnt = bundle_at = 0;
7916                 endoutchain = outchain = NULL;
7917                 no_fragmentflg = 1;
7918                 one_chunk = 0;
7919                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7920                         skip_data_for_this_net = 1;
7921                 } else {
7922                         skip_data_for_this_net = 0;
7923                 }
7924                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7925                         /*
7926                          * if we have a route and an ifp check to see if we
7927                          * have room to send to this guy
7928                          */
7929                         struct ifnet *ifp;
7930
7931                         ifp = net->ro.ro_rt->rt_ifp;
7932                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7933                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7934                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7935                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7936                                 }
7937                                 continue;
7938                         }
7939                 }
7940                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7941 #ifdef INET
7942                 case AF_INET:
7943                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7944                         break;
7945 #endif
7946 #ifdef INET6
7947                 case AF_INET6:
7948                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7949                         break;
7950 #endif
7951                 default:
7952                         /* TSNH */
7953                         mtu = net->mtu;
7954                         break;
7955                 }
7956                 mx_mtu = mtu;
7957                 to_out = 0;
7958                 if (mtu > asoc->peers_rwnd) {
7959                         if (asoc->total_flight > 0) {
7960                                 /* We have a packet in flight somewhere */
7961                                 r_mtu = asoc->peers_rwnd;
7962                         } else {
7963                                 /* We are always allowed to send one MTU out */
7964                                 one_chunk = 1;
7965                                 r_mtu = mtu;
7966                         }
7967                 } else {
7968                         r_mtu = mtu;
7969                 }
7970                 /************************/
7971                 /* ASCONF transmission */
7972                 /************************/
7973                 /* Now first lets go through the asconf queue */
7974                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7975                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7976                                 continue;
7977                         }
7978                         if (chk->whoTo != net) {
7979                                 /*
7980                                  * No, not sent to the network we are
7981                                  * looking at
7982                                  */
7983                                 break;
7984                         }
7985                         if (chk->data == NULL) {
7986                                 break;
7987                         }
7988                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7989                             chk->sent != SCTP_DATAGRAM_RESEND) {
7990                                 break;
7991                         }
7992                         /*
7993                          * if no AUTH is yet included and this chunk
7994                          * requires it, make sure to account for it.  We
7995                          * don't apply the size until the AUTH chunk is
7996                          * actually added below in case there is no room for
7997                          * this chunk. NOTE: we overload the use of "omtu"
7998                          * here
7999                          */
8000                         if ((auth == NULL) &&
8001                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8002                             stcb->asoc.peer_auth_chunks)) {
8003                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8004                         } else
8005                                 omtu = 0;
8006                         /* Here we do NOT factor the r_mtu */
8007                         if ((chk->send_size < (int)(mtu - omtu)) ||
8008                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8009                                 /*
8010                                  * We probably should glom the mbuf chain
8011                                  * from the chk->data for control but the
8012                                  * problem is it becomes yet one more level
8013                                  * of tracking to do if for some reason
8014                                  * output fails. Then I have got to
8015                                  * reconstruct the merged control chain.. el
8016                                  * yucko.. for now we take the easy way and
8017                                  * do the copy
8018                                  */
8019                                 /*
8020                                  * Add an AUTH chunk, if chunk requires it
8021                                  * save the offset into the chain for AUTH
8022                                  */
8023                                 if ((auth == NULL) &&
8024                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8025                                     stcb->asoc.peer_auth_chunks))) {
8026                                         outchain = sctp_add_auth_chunk(outchain,
8027                                             &endoutchain,
8028                                             &auth,
8029                                             &auth_offset,
8030                                             stcb,
8031                                             chk->rec.chunk_id.id);
8032                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8033                                 }
8034                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8035                                     (int)chk->rec.chunk_id.can_take_data,
8036                                     chk->send_size, chk->copy_by_ref);
8037                                 if (outchain == NULL) {
8038                                         *reason_code = 8;
8039                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8040                                         return (ENOMEM);
8041                                 }
8042                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8043                                 /* update our MTU size */
8044                                 if (mtu > (chk->send_size + omtu))
8045                                         mtu -= (chk->send_size + omtu);
8046                                 else
8047                                         mtu = 0;
8048                                 to_out += (chk->send_size + omtu);
8049                                 /* Do clear IP_DF ? */
8050                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8051                                         no_fragmentflg = 0;
8052                                 }
8053                                 if (chk->rec.chunk_id.can_take_data)
8054                                         chk->data = NULL;
8055                                 /*
8056                                  * set hb flag since we can use these for
8057                                  * RTO
8058                                  */
8059                                 hbflag = 1;
8060                                 asconf = 1;
8061                                 /*
8062                                  * should sysctl this: don't bundle data
8063                                  * with ASCONF since it requires AUTH
8064                                  */
8065                                 no_data_chunks = 1;
8066                                 chk->sent = SCTP_DATAGRAM_SENT;
8067                                 chk->snd_count++;
8068                                 if (mtu == 0) {
8069                                         /*
8070                                          * Ok we are out of room but we can
8071                                          * output without effecting the
8072                                          * flight size since this little guy
8073                                          * is a control only packet.
8074                                          */
8075                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8076                                         /*
8077                                          * do NOT clear the asconf flag as
8078                                          * it is used to do appropriate
8079                                          * source address selection.
8080                                          */
8081                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8082                                             (struct sockaddr *)&net->ro._l_addr,
8083                                             outchain, auth_offset, auth,
8084                                             stcb->asoc.authinfo.active_keyid,
8085                                             no_fragmentflg, 0, NULL, asconf,
8086                                             inp->sctp_lport, stcb->rport,
8087                                             htonl(stcb->asoc.peer_vtag),
8088                                             net->port, so_locked, NULL, NULL))) {
8089                                                 if (error == ENOBUFS) {
8090                                                         asoc->ifp_had_enobuf = 1;
8091                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8092                                                 }
8093                                                 if (from_where == 0) {
8094                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8095                                                 }
8096                                                 if (*now_filled == 0) {
8097                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8098                                                         *now_filled = 1;
8099                                                         *now = net->last_sent_time;
8100                                                 } else {
8101                                                         net->last_sent_time = *now;
8102                                                 }
8103                                                 hbflag = 0;
8104                                                 /* error, could not output */
8105                                                 if (error == EHOSTUNREACH) {
8106                                                         /*
8107                                                          * Destination went
8108                                                          * unreachable
8109                                                          * during this send
8110                                                          */
8111                                                         sctp_move_chunks_from_net(stcb, net);
8112                                                 }
8113                                                 *reason_code = 7;
8114                                                 continue;
8115                                         } else
8116                                                 asoc->ifp_had_enobuf = 0;
8117                                         if (*now_filled == 0) {
8118                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8119                                                 *now_filled = 1;
8120                                                 *now = net->last_sent_time;
8121                                         } else {
8122                                                 net->last_sent_time = *now;
8123                                         }
8124                                         hbflag = 0;
8125                                         /*
8126                                          * increase the number we sent, if a
8127                                          * cookie is sent we don't tell them
8128                                          * any was sent out.
8129                                          */
8130                                         outchain = endoutchain = NULL;
8131                                         auth = NULL;
8132                                         auth_offset = 0;
8133                                         if (!no_out_cnt)
8134                                                 *num_out += ctl_cnt;
8135                                         /* recalc a clean slate and setup */
8136                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8137                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8138                                         } else {
8139                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8140                                         }
8141                                         to_out = 0;
8142                                         no_fragmentflg = 1;
8143                                 }
8144                         }
8145                 }
8146                 /************************/
8147                 /* Control transmission */
8148                 /************************/
8149                 /* Now first lets go through the control queue */
8150                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8151                         if ((sack_goes_to) &&
8152                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8153                             (chk->whoTo != sack_goes_to)) {
8154                                 /*
8155                                  * if we have a sack in queue, and we are
8156                                  * looking at an ecn echo that is NOT queued
8157                                  * to where the sack is going..
8158                                  */
8159                                 if (chk->whoTo == net) {
8160                                         /*
8161                                          * Don't transmit it to where its
8162                                          * going (current net)
8163                                          */
8164                                         continue;
8165                                 } else if (sack_goes_to == net) {
8166                                         /*
8167                                          * But do transmit it to this
8168                                          * address
8169                                          */
8170                                         goto skip_net_check;
8171                                 }
8172                         }
8173                         if (chk->whoTo != net) {
8174                                 /*
8175                                  * No, not sent to the network we are
8176                                  * looking at
8177                                  */
8178                                 continue;
8179                         }
8180         skip_net_check:
8181                         if (chk->data == NULL) {
8182                                 continue;
8183                         }
8184                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8185                                 /*
8186                                  * It must be unsent. Cookies and ASCONF's
8187                                  * hang around but there timers will force
8188                                  * when marked for resend.
8189                                  */
8190                                 continue;
8191                         }
8192                         /*
8193                          * if no AUTH is yet included and this chunk
8194                          * requires it, make sure to account for it.  We
8195                          * don't apply the size until the AUTH chunk is
8196                          * actually added below in case there is no room for
8197                          * this chunk. NOTE: we overload the use of "omtu"
8198                          * here
8199                          */
8200                         if ((auth == NULL) &&
8201                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8202                             stcb->asoc.peer_auth_chunks)) {
8203                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8204                         } else
8205                                 omtu = 0;
8206                         /* Here we do NOT factor the r_mtu */
8207                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8208                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8209                                 /*
8210                                  * We probably should glom the mbuf chain
8211                                  * from the chk->data for control but the
8212                                  * problem is it becomes yet one more level
8213                                  * of tracking to do if for some reason
8214                                  * output fails. Then I have got to
8215                                  * reconstruct the merged control chain.. el
8216                                  * yucko.. for now we take the easy way and
8217                                  * do the copy
8218                                  */
8219                                 /*
8220                                  * Add an AUTH chunk, if chunk requires it
8221                                  * save the offset into the chain for AUTH
8222                                  */
8223                                 if ((auth == NULL) &&
8224                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8225                                     stcb->asoc.peer_auth_chunks))) {
8226                                         outchain = sctp_add_auth_chunk(outchain,
8227                                             &endoutchain,
8228                                             &auth,
8229                                             &auth_offset,
8230                                             stcb,
8231                                             chk->rec.chunk_id.id);
8232                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8233                                 }
8234                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8235                                     (int)chk->rec.chunk_id.can_take_data,
8236                                     chk->send_size, chk->copy_by_ref);
8237                                 if (outchain == NULL) {
8238                                         *reason_code = 8;
8239                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8240                                         return (ENOMEM);
8241                                 }
8242                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8243                                 /* update our MTU size */
8244                                 if (mtu > (chk->send_size + omtu))
8245                                         mtu -= (chk->send_size + omtu);
8246                                 else
8247                                         mtu = 0;
8248                                 to_out += (chk->send_size + omtu);
8249                                 /* Do clear IP_DF ? */
8250                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8251                                         no_fragmentflg = 0;
8252                                 }
8253                                 if (chk->rec.chunk_id.can_take_data)
8254                                         chk->data = NULL;
8255                                 /* Mark things to be removed, if needed */
8256                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8257                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8258                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8259                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8260                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8261                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8262                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8263                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8264                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8265                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8266                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8267                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8268                                                 hbflag = 1;
8269                                         }
8270                                         /* remove these chunks at the end */
8271                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8272                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8273                                                 /* turn off the timer */
8274                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8275                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8276                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8277                                                 }
8278                                         }
8279                                         ctl_cnt++;
8280                                 } else {
8281                                         /*
8282                                          * Other chunks, since they have
8283                                          * timers running (i.e. COOKIE) we
8284                                          * just "trust" that it gets sent or
8285                                          * retransmitted.
8286                                          */
8287                                         ctl_cnt++;
8288                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8289                                                 cookie = 1;
8290                                                 no_out_cnt = 1;
8291                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8292                                                 /*
8293                                                  * Increment ecne send count
8294                                                  * here this means we may be
8295                                                  * over-zealous in our
8296                                                  * counting if the send
8297                                                  * fails, but its the best
8298                                                  * place to do it (we used
8299                                                  * to do it in the queue of
8300                                                  * the chunk, but that did
8301                                                  * not tell how many times
8302                                                  * it was sent.
8303                                                  */
8304                                                 SCTP_STAT_INCR(sctps_sendecne);
8305                                         }
8306                                         chk->sent = SCTP_DATAGRAM_SENT;
8307                                         chk->snd_count++;
8308                                 }
8309                                 if (mtu == 0) {
8310                                         /*
8311                                          * Ok we are out of room but we can
8312                                          * output without effecting the
8313                                          * flight size since this little guy
8314                                          * is a control only packet.
8315                                          */
8316                                         if (asconf) {
8317                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8318                                                 /*
8319                                                  * do NOT clear the asconf
8320                                                  * flag as it is used to do
8321                                                  * appropriate source
8322                                                  * address selection.
8323                                                  */
8324                                         }
8325                                         if (cookie) {
8326                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8327                                                 cookie = 0;
8328                                         }
8329                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8330                                             (struct sockaddr *)&net->ro._l_addr,
8331                                             outchain,
8332                                             auth_offset, auth,
8333                                             stcb->asoc.authinfo.active_keyid,
8334                                             no_fragmentflg, 0, NULL, asconf,
8335                                             inp->sctp_lport, stcb->rport,
8336                                             htonl(stcb->asoc.peer_vtag),
8337                                             net->port, so_locked, NULL, NULL))) {
8338                                                 if (error == ENOBUFS) {
8339                                                         asoc->ifp_had_enobuf = 1;
8340                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8341                                                 }
8342                                                 if (from_where == 0) {
8343                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8344                                                 }
8345                                                 /* error, could not output */
8346                                                 if (hbflag) {
8347                                                         if (*now_filled == 0) {
8348                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8349                                                                 *now_filled = 1;
8350                                                                 *now = net->last_sent_time;
8351                                                         } else {
8352                                                                 net->last_sent_time = *now;
8353                                                         }
8354                                                         hbflag = 0;
8355                                                 }
8356                                                 if (error == EHOSTUNREACH) {
8357                                                         /*
8358                                                          * Destination went
8359                                                          * unreachable
8360                                                          * during this send
8361                                                          */
8362                                                         sctp_move_chunks_from_net(stcb, net);
8363                                                 }
8364                                                 *reason_code = 7;
8365                                                 continue;
8366                                         } else
8367                                                 asoc->ifp_had_enobuf = 0;
8368                                         /* Only HB or ASCONF advances time */
8369                                         if (hbflag) {
8370                                                 if (*now_filled == 0) {
8371                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8372                                                         *now_filled = 1;
8373                                                         *now = net->last_sent_time;
8374                                                 } else {
8375                                                         net->last_sent_time = *now;
8376                                                 }
8377                                                 hbflag = 0;
8378                                         }
8379                                         /*
8380                                          * increase the number we sent, if a
8381                                          * cookie is sent we don't tell them
8382                                          * any was sent out.
8383                                          */
8384                                         outchain = endoutchain = NULL;
8385                                         auth = NULL;
8386                                         auth_offset = 0;
8387                                         if (!no_out_cnt)
8388                                                 *num_out += ctl_cnt;
8389                                         /* recalc a clean slate and setup */
8390                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8391                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8392                                         } else {
8393                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8394                                         }
8395                                         to_out = 0;
8396                                         no_fragmentflg = 1;
8397                                 }
8398                         }
8399                 }
8400                 /* JRI: if dest is in PF state, do not send data to it */
8401                 if ((asoc->sctp_cmt_on_off > 0) &&
8402                     (net != stcb->asoc.alternate) &&
8403                     (net->dest_state & SCTP_ADDR_PF)) {
8404                         goto no_data_fill;
8405                 }
8406                 if (net->flight_size >= net->cwnd) {
8407                         goto no_data_fill;
8408                 }
8409                 if ((asoc->sctp_cmt_on_off > 0) &&
8410                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8411                     (net->flight_size > max_rwnd_per_dest)) {
8412                         goto no_data_fill;
8413                 }
8414                 /*
8415                  * We need a specific accounting for the usage of the send
8416                  * buffer. We also need to check the number of messages per
8417                  * net. For now, this is better than nothing and it disabled
8418                  * by default...
8419                  */
8420                 if ((asoc->sctp_cmt_on_off > 0) &&
8421                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8422                     (max_send_per_dest > 0) &&
8423                     (net->flight_size > max_send_per_dest)) {
8424                         goto no_data_fill;
8425                 }
8426                 /*********************/
8427                 /* Data transmission */
8428                 /*********************/
8429                 /*
8430                  * if AUTH for DATA is required and no AUTH has been added
8431                  * yet, account for this in the mtu now... if no data can be
8432                  * bundled, this adjustment won't matter anyways since the
8433                  * packet will be going out...
8434                  */
8435                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8436                     stcb->asoc.peer_auth_chunks);
8437                 if (data_auth_reqd && (auth == NULL)) {
8438                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8439                 }
8440                 /* now lets add any data within the MTU constraints */
8441                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8442                 case AF_INET:
8443                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8444                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8445                         else
8446                                 omtu = 0;
8447                         break;
8448 #ifdef INET6
8449                 case AF_INET6:
8450                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8451                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8452                         else
8453                                 omtu = 0;
8454                         break;
8455 #endif
8456                 default:
8457                         /* TSNH */
8458                         omtu = 0;
8459                         break;
8460                 }
8461                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8462                     (skip_data_for_this_net == 0)) ||
8463                     (cookie)) {
8464                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8465                                 if (no_data_chunks) {
8466                                         /* let only control go out */
8467                                         *reason_code = 1;
8468                                         break;
8469                                 }
8470                                 if (net->flight_size >= net->cwnd) {
8471                                         /* skip this net, no room for data */
8472                                         *reason_code = 2;
8473                                         break;
8474                                 }
8475                                 if ((chk->whoTo != NULL) &&
8476                                     (chk->whoTo != net)) {
8477                                         /* Don't send the chunk on this net */
8478                                         continue;
8479                                 }
8480                                 if (asoc->sctp_cmt_on_off == 0) {
8481                                         if ((asoc->alternate) &&
8482                                             (asoc->alternate != net) &&
8483                                             (chk->whoTo == NULL)) {
8484                                                 continue;
8485                                         } else if ((net != asoc->primary_destination) &&
8486                                                     (asoc->alternate == NULL) &&
8487                                             (chk->whoTo == NULL)) {
8488                                                 continue;
8489                                         }
8490                                 }
8491                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8492                                         /*-
8493                                          * strange, we have a chunk that is
8494                                          * to big for its destination and
8495                                          * yet no fragment ok flag.
8496                                          * Something went wrong when the
8497                                          * PMTU changed...we did not mark
8498                                          * this chunk for some reason?? I
8499                                          * will fix it here by letting IP
8500                                          * fragment it for now and printing
8501                                          * a warning. This really should not
8502                                          * happen ...
8503                                          */
8504                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8505                                             chk->send_size, mtu);
8506                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8507                                 }
8508                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8509                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8510                                         struct sctp_data_chunk *dchkh;
8511
8512                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8513                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8514                                 }
8515                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8516                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8517                                         /* ok we will add this one */
8518
8519                                         /*
8520                                          * Add an AUTH chunk, if chunk
8521                                          * requires it, save the offset into
8522                                          * the chain for AUTH
8523                                          */
8524                                         if (data_auth_reqd) {
8525                                                 if (auth == NULL) {
8526                                                         outchain = sctp_add_auth_chunk(outchain,
8527                                                             &endoutchain,
8528                                                             &auth,
8529                                                             &auth_offset,
8530                                                             stcb,
8531                                                             SCTP_DATA);
8532                                                         auth_keyid = chk->auth_keyid;
8533                                                         override_ok = 0;
8534                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8535                                                 } else if (override_ok) {
8536                                                         /*
8537                                                          * use this data's
8538                                                          * keyid
8539                                                          */
8540                                                         auth_keyid = chk->auth_keyid;
8541                                                         override_ok = 0;
8542                                                 } else if (auth_keyid != chk->auth_keyid) {
8543                                                         /*
8544                                                          * different keyid,
8545                                                          * so done bundling
8546                                                          */
8547                                                         break;
8548                                                 }
8549                                         }
8550                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8551                                             chk->send_size, chk->copy_by_ref);
8552                                         if (outchain == NULL) {
8553                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8554                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8555                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8556                                                 }
8557                                                 *reason_code = 3;
8558                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8559                                                 return (ENOMEM);
8560                                         }
8561                                         /* upate our MTU size */
8562                                         /* Do clear IP_DF ? */
8563                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8564                                                 no_fragmentflg = 0;
8565                                         }
8566                                         /* unsigned subtraction of mtu */
8567                                         if (mtu > chk->send_size)
8568                                                 mtu -= chk->send_size;
8569                                         else
8570                                                 mtu = 0;
8571                                         /* unsigned subtraction of r_mtu */
8572                                         if (r_mtu > chk->send_size)
8573                                                 r_mtu -= chk->send_size;
8574                                         else
8575                                                 r_mtu = 0;
8576
8577                                         to_out += chk->send_size;
8578                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8579 #ifdef INVARIANTS
8580                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8581 #else
8582                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8583                                                     mx_mtu, to_out);
8584 #endif
8585                                         }
8586                                         chk->window_probe = 0;
8587                                         data_list[bundle_at++] = chk;
8588                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8589                                                 mtu = 0;
8590                                                 break;
8591                                         }
8592                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8593                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8594                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8595                                                 } else {
8596                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8597                                                 }
8598                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8599                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8600                                                         /*
8601                                                          * Count number of
8602                                                          * user msg's that
8603                                                          * were fragmented
8604                                                          * we do this by
8605                                                          * counting when we
8606                                                          * see a LAST
8607                                                          * fragment only.
8608                                                          */
8609                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8610                                         }
8611                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8612                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8613                                                         data_list[0]->window_probe = 1;
8614                                                         net->window_probe = 1;
8615                                                 }
8616                                                 break;
8617                                         }
8618                                 } else {
8619                                         /*
8620                                          * Must be sent in order of the
8621                                          * TSN's (on a network)
8622                                          */
8623                                         break;
8624                                 }
8625                         }       /* for (chunk gather loop for this net) */
8626                 }               /* if asoc.state OPEN */
8627 no_data_fill:
8628                 /* Is there something to send for this destination? */
8629                 if (outchain) {
8630                         /* We may need to start a control timer or two */
8631                         if (asconf) {
8632                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8633                                     stcb, net);
8634                                 /*
8635                                  * do NOT clear the asconf flag as it is
8636                                  * used to do appropriate source address
8637                                  * selection.
8638                                  */
8639                         }
8640                         if (cookie) {
8641                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8642                                 cookie = 0;
8643                         }
8644                         /* must start a send timer if data is being sent */
8645                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8646                                 /*
8647                                  * no timer running on this destination
8648                                  * restart it.
8649                                  */
8650                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8651                         }
8652                         /* Now send it, if there is anything to send :> */
8653                         if ((error = sctp_lowlevel_chunk_output(inp,
8654                             stcb,
8655                             net,
8656                             (struct sockaddr *)&net->ro._l_addr,
8657                             outchain,
8658                             auth_offset,
8659                             auth,
8660                             auth_keyid,
8661                             no_fragmentflg,
8662                             bundle_at,
8663                             data_list[0],
8664                             asconf,
8665                             inp->sctp_lport, stcb->rport,
8666                             htonl(stcb->asoc.peer_vtag),
8667                             net->port, so_locked, NULL, NULL))) {
8668                                 /* error, we could not output */
8669                                 if (error == ENOBUFS) {
8670                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8671                                         asoc->ifp_had_enobuf = 1;
8672                                 }
8673                                 if (from_where == 0) {
8674                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8675                                 }
8676                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8677                                 if (hbflag) {
8678                                         if (*now_filled == 0) {
8679                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8680                                                 *now_filled = 1;
8681                                                 *now = net->last_sent_time;
8682                                         } else {
8683                                                 net->last_sent_time = *now;
8684                                         }
8685                                         hbflag = 0;
8686                                 }
8687                                 if (error == EHOSTUNREACH) {
8688                                         /*
8689                                          * Destination went unreachable
8690                                          * during this send
8691                                          */
8692                                         sctp_move_chunks_from_net(stcb, net);
8693                                 }
8694                                 *reason_code = 6;
8695                                 /*-
8696                                  * I add this line to be paranoid. As far as
8697                                  * I can tell the continue, takes us back to
8698                                  * the top of the for, but just to make sure
8699                                  * I will reset these again here.
8700                                  */
8701                                 ctl_cnt = bundle_at = 0;
8702                                 continue;       /* This takes us back to the
8703                                                  * for() for the nets. */
8704                         } else {
8705                                 asoc->ifp_had_enobuf = 0;
8706                         }
8707                         outchain = endoutchain = NULL;
8708                         auth = NULL;
8709                         auth_offset = 0;
8710                         if (bundle_at || hbflag) {
8711                                 /* For data/asconf and hb set time */
8712                                 if (*now_filled == 0) {
8713                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8714                                         *now_filled = 1;
8715                                         *now = net->last_sent_time;
8716                                 } else {
8717                                         net->last_sent_time = *now;
8718                                 }
8719                         }
8720                         if (!no_out_cnt) {
8721                                 *num_out += (ctl_cnt + bundle_at);
8722                         }
8723                         if (bundle_at) {
8724                                 /* setup for a RTO measurement */
8725                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8726                                 /* fill time if not already filled */
8727                                 if (*now_filled == 0) {
8728                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8729                                         *now_filled = 1;
8730                                         *now = asoc->time_last_sent;
8731                                 } else {
8732                                         asoc->time_last_sent = *now;
8733                                 }
8734                                 if (net->rto_needed) {
8735                                         data_list[0]->do_rtt = 1;
8736                                         net->rto_needed = 0;
8737                                 }
8738                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8739                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8740                         }
8741                         if (one_chunk) {
8742                                 break;
8743                         }
8744                 }
8745                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8746                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8747                 }
8748         }
8749         if (old_start_at == NULL) {
8750                 old_start_at = start_at;
8751                 start_at = TAILQ_FIRST(&asoc->nets);
8752                 if (old_start_at)
8753                         goto again_one_more_time;
8754         }
8755         /*
8756          * At the end there should be no NON timed chunks hanging on this
8757          * queue.
8758          */
8759         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8760                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8761         }
8762         if ((*num_out == 0) && (*reason_code == 0)) {
8763                 *reason_code = 4;
8764         } else {
8765                 *reason_code = 5;
8766         }
8767         sctp_clean_up_ctl(stcb, asoc, so_locked);
8768         return (0);
8769 }
8770
8771 void
8772 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8773 {
8774         /*-
8775          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8776          * the control chunk queue.
8777          */
8778         struct sctp_chunkhdr *hdr;
8779         struct sctp_tmit_chunk *chk;
8780         struct mbuf *mat;
8781
8782         SCTP_TCB_LOCK_ASSERT(stcb);
8783         sctp_alloc_a_chunk(stcb, chk);
8784         if (chk == NULL) {
8785                 /* no memory */
8786                 sctp_m_freem(op_err);
8787                 return;
8788         }
8789         chk->copy_by_ref = 0;
8790         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8791         if (op_err == NULL) {
8792                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8793                 return;
8794         }
8795         chk->send_size = 0;
8796         mat = op_err;
8797         while (mat != NULL) {
8798                 chk->send_size += SCTP_BUF_LEN(mat);
8799                 mat = SCTP_BUF_NEXT(mat);
8800         }
8801         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8802         chk->rec.chunk_id.can_take_data = 1;
8803         chk->sent = SCTP_DATAGRAM_UNSENT;
8804         chk->snd_count = 0;
8805         chk->flags = 0;
8806         chk->asoc = &stcb->asoc;
8807         chk->data = op_err;
8808         chk->whoTo = NULL;
8809         hdr = mtod(op_err, struct sctp_chunkhdr *);
8810         hdr->chunk_type = SCTP_OPERATION_ERROR;
8811         hdr->chunk_flags = 0;
8812         hdr->chunk_length = htons(chk->send_size);
8813         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8814             chk,
8815             sctp_next);
8816         chk->asoc->ctrl_queue_cnt++;
8817 }
8818
8819 int
8820 sctp_send_cookie_echo(struct mbuf *m,
8821     int offset,
8822     struct sctp_tcb *stcb,
8823     struct sctp_nets *net)
8824 {
8825         /*-
8826          * pull out the cookie and put it at the front of the control chunk
8827          * queue.
8828          */
8829         int at;
8830         struct mbuf *cookie;
8831         struct sctp_paramhdr parm, *phdr;
8832         struct sctp_chunkhdr *hdr;
8833         struct sctp_tmit_chunk *chk;
8834         uint16_t ptype, plen;
8835
8836         /* First find the cookie in the param area */
8837         cookie = NULL;
8838         at = offset + sizeof(struct sctp_init_chunk);
8839
8840         SCTP_TCB_LOCK_ASSERT(stcb);
8841         do {
8842                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8843                 if (phdr == NULL) {
8844                         return (-3);
8845                 }
8846                 ptype = ntohs(phdr->param_type);
8847                 plen = ntohs(phdr->param_length);
8848                 if (ptype == SCTP_STATE_COOKIE) {
8849                         int pad;
8850
8851                         /* found the cookie */
8852                         if ((pad = (plen % 4))) {
8853                                 plen += 4 - pad;
8854                         }
8855                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8856                         if (cookie == NULL) {
8857                                 /* No memory */
8858                                 return (-2);
8859                         }
8860 #ifdef SCTP_MBUF_LOGGING
8861                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8862                                 struct mbuf *mat;
8863
8864                                 mat = cookie;
8865                                 while (mat) {
8866                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8867                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8868                                         }
8869                                         mat = SCTP_BUF_NEXT(mat);
8870                                 }
8871                         }
8872 #endif
8873                         break;
8874                 }
8875                 at += SCTP_SIZE32(plen);
8876         } while (phdr);
8877         if (cookie == NULL) {
8878                 /* Did not find the cookie */
8879                 return (-3);
8880         }
8881         /* ok, we got the cookie lets change it into a cookie echo chunk */
8882
8883         /* first the change from param to cookie */
8884         hdr = mtod(cookie, struct sctp_chunkhdr *);
8885         hdr->chunk_type = SCTP_COOKIE_ECHO;
8886         hdr->chunk_flags = 0;
8887         /* get the chunk stuff now and place it in the FRONT of the queue */
8888         sctp_alloc_a_chunk(stcb, chk);
8889         if (chk == NULL) {
8890                 /* no memory */
8891                 sctp_m_freem(cookie);
8892                 return (-5);
8893         }
8894         chk->copy_by_ref = 0;
8895         chk->send_size = plen;
8896         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8897         chk->rec.chunk_id.can_take_data = 0;
8898         chk->sent = SCTP_DATAGRAM_UNSENT;
8899         chk->snd_count = 0;
8900         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8901         chk->asoc = &stcb->asoc;
8902         chk->data = cookie;
8903         chk->whoTo = net;
8904         atomic_add_int(&chk->whoTo->ref_count, 1);
8905         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8906         chk->asoc->ctrl_queue_cnt++;
8907         return (0);
8908 }
8909
8910 void
8911 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8912     struct mbuf *m,
8913     int offset,
8914     int chk_length,
8915     struct sctp_nets *net)
8916 {
8917         /*
8918          * take a HB request and make it into a HB ack and send it.
8919          */
8920         struct mbuf *outchain;
8921         struct sctp_chunkhdr *chdr;
8922         struct sctp_tmit_chunk *chk;
8923
8924
8925         if (net == NULL)
8926                 /* must have a net pointer */
8927                 return;
8928
8929         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8930         if (outchain == NULL) {
8931                 /* gak out of memory */
8932                 return;
8933         }
8934 #ifdef SCTP_MBUF_LOGGING
8935         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8936                 struct mbuf *mat;
8937
8938                 mat = outchain;
8939                 while (mat) {
8940                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8941                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8942                         }
8943                         mat = SCTP_BUF_NEXT(mat);
8944                 }
8945         }
8946 #endif
8947         chdr = mtod(outchain, struct sctp_chunkhdr *);
8948         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8949         chdr->chunk_flags = 0;
8950         if (chk_length % 4) {
8951                 /* need pad */
8952                 uint32_t cpthis = 0;
8953                 int padlen;
8954
8955                 padlen = 4 - (chk_length % 4);
8956                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8957         }
8958         sctp_alloc_a_chunk(stcb, chk);
8959         if (chk == NULL) {
8960                 /* no memory */
8961                 sctp_m_freem(outchain);
8962                 return;
8963         }
8964         chk->copy_by_ref = 0;
8965         chk->send_size = chk_length;
8966         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8967         chk->rec.chunk_id.can_take_data = 1;
8968         chk->sent = SCTP_DATAGRAM_UNSENT;
8969         chk->snd_count = 0;
8970         chk->flags = 0;
8971         chk->asoc = &stcb->asoc;
8972         chk->data = outchain;
8973         chk->whoTo = net;
8974         atomic_add_int(&chk->whoTo->ref_count, 1);
8975         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8976         chk->asoc->ctrl_queue_cnt++;
8977 }
8978
8979 void
8980 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8981 {
8982         /* formulate and queue a cookie-ack back to sender */
8983         struct mbuf *cookie_ack;
8984         struct sctp_chunkhdr *hdr;
8985         struct sctp_tmit_chunk *chk;
8986
8987         cookie_ack = NULL;
8988         SCTP_TCB_LOCK_ASSERT(stcb);
8989
8990         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8991         if (cookie_ack == NULL) {
8992                 /* no mbuf's */
8993                 return;
8994         }
8995         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8996         sctp_alloc_a_chunk(stcb, chk);
8997         if (chk == NULL) {
8998                 /* no memory */
8999                 sctp_m_freem(cookie_ack);
9000                 return;
9001         }
9002         chk->copy_by_ref = 0;
9003         chk->send_size = sizeof(struct sctp_chunkhdr);
9004         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9005         chk->rec.chunk_id.can_take_data = 1;
9006         chk->sent = SCTP_DATAGRAM_UNSENT;
9007         chk->snd_count = 0;
9008         chk->flags = 0;
9009         chk->asoc = &stcb->asoc;
9010         chk->data = cookie_ack;
9011         if (chk->asoc->last_control_chunk_from != NULL) {
9012                 chk->whoTo = chk->asoc->last_control_chunk_from;
9013                 atomic_add_int(&chk->whoTo->ref_count, 1);
9014         } else {
9015                 chk->whoTo = NULL;
9016         }
9017         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9018         hdr->chunk_type = SCTP_COOKIE_ACK;
9019         hdr->chunk_flags = 0;
9020         hdr->chunk_length = htons(chk->send_size);
9021         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9022         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9023         chk->asoc->ctrl_queue_cnt++;
9024         return;
9025 }
9026
9027
9028 void
9029 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9030 {
9031         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9032         struct mbuf *m_shutdown_ack;
9033         struct sctp_shutdown_ack_chunk *ack_cp;
9034         struct sctp_tmit_chunk *chk;
9035
9036         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9037         if (m_shutdown_ack == NULL) {
9038                 /* no mbuf's */
9039                 return;
9040         }
9041         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9042         sctp_alloc_a_chunk(stcb, chk);
9043         if (chk == NULL) {
9044                 /* no memory */
9045                 sctp_m_freem(m_shutdown_ack);
9046                 return;
9047         }
9048         chk->copy_by_ref = 0;
9049         chk->send_size = sizeof(struct sctp_chunkhdr);
9050         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9051         chk->rec.chunk_id.can_take_data = 1;
9052         chk->sent = SCTP_DATAGRAM_UNSENT;
9053         chk->snd_count = 0;
9054         chk->flags = 0;
9055         chk->asoc = &stcb->asoc;
9056         chk->data = m_shutdown_ack;
9057         chk->whoTo = net;
9058         if (chk->whoTo) {
9059                 atomic_add_int(&chk->whoTo->ref_count, 1);
9060         }
9061         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9062         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9063         ack_cp->ch.chunk_flags = 0;
9064         ack_cp->ch.chunk_length = htons(chk->send_size);
9065         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9066         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9067         chk->asoc->ctrl_queue_cnt++;
9068         return;
9069 }
9070
9071 void
9072 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9073 {
9074         /* formulate and queue a SHUTDOWN to the sender */
9075         struct mbuf *m_shutdown;
9076         struct sctp_shutdown_chunk *shutdown_cp;
9077         struct sctp_tmit_chunk *chk;
9078
9079         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9080         if (m_shutdown == NULL) {
9081                 /* no mbuf's */
9082                 return;
9083         }
9084         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9085         sctp_alloc_a_chunk(stcb, chk);
9086         if (chk == NULL) {
9087                 /* no memory */
9088                 sctp_m_freem(m_shutdown);
9089                 return;
9090         }
9091         chk->copy_by_ref = 0;
9092         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9093         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9094         chk->rec.chunk_id.can_take_data = 1;
9095         chk->sent = SCTP_DATAGRAM_UNSENT;
9096         chk->snd_count = 0;
9097         chk->flags = 0;
9098         chk->asoc = &stcb->asoc;
9099         chk->data = m_shutdown;
9100         chk->whoTo = net;
9101         if (chk->whoTo) {
9102                 atomic_add_int(&chk->whoTo->ref_count, 1);
9103         }
9104         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9105         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9106         shutdown_cp->ch.chunk_flags = 0;
9107         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9108         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9109         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9110         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9111         chk->asoc->ctrl_queue_cnt++;
9112         return;
9113 }
9114
9115 void
9116 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9117 {
9118         /*
9119          * formulate and queue an ASCONF to the peer. ASCONF parameters
9120          * should be queued on the assoc queue.
9121          */
9122         struct sctp_tmit_chunk *chk;
9123         struct mbuf *m_asconf;
9124         int len;
9125
9126         SCTP_TCB_LOCK_ASSERT(stcb);
9127
9128         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9129             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9130                 /* can't send a new one if there is one in flight already */
9131                 return;
9132         }
9133         /* compose an ASCONF chunk, maximum length is PMTU */
9134         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9135         if (m_asconf == NULL) {
9136                 return;
9137         }
9138         sctp_alloc_a_chunk(stcb, chk);
9139         if (chk == NULL) {
9140                 /* no memory */
9141                 sctp_m_freem(m_asconf);
9142                 return;
9143         }
9144         chk->copy_by_ref = 0;
9145         chk->data = m_asconf;
9146         chk->send_size = len;
9147         chk->rec.chunk_id.id = SCTP_ASCONF;
9148         chk->rec.chunk_id.can_take_data = 0;
9149         chk->sent = SCTP_DATAGRAM_UNSENT;
9150         chk->snd_count = 0;
9151         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9152         chk->asoc = &stcb->asoc;
9153         chk->whoTo = net;
9154         if (chk->whoTo) {
9155                 atomic_add_int(&chk->whoTo->ref_count, 1);
9156         }
9157         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9158         chk->asoc->ctrl_queue_cnt++;
9159         return;
9160 }
9161
9162 void
9163 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9164 {
9165         /*
9166          * formulate and queue a asconf-ack back to sender. the asconf-ack
9167          * must be stored in the tcb.
9168          */
9169         struct sctp_tmit_chunk *chk;
9170         struct sctp_asconf_ack *ack, *latest_ack;
9171         struct mbuf *m_ack, *m;
9172         struct sctp_nets *net = NULL;
9173
9174         SCTP_TCB_LOCK_ASSERT(stcb);
9175         /* Get the latest ASCONF-ACK */
9176         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9177         if (latest_ack == NULL) {
9178                 return;
9179         }
9180         if (latest_ack->last_sent_to != NULL &&
9181             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9182                 /* we're doing a retransmission */
9183                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9184                 if (net == NULL) {
9185                         /* no alternate */
9186                         if (stcb->asoc.last_control_chunk_from == NULL) {
9187                                 if (stcb->asoc.alternate) {
9188                                         net = stcb->asoc.alternate;
9189                                 } else {
9190                                         net = stcb->asoc.primary_destination;
9191                                 }
9192                         } else {
9193                                 net = stcb->asoc.last_control_chunk_from;
9194                         }
9195                 }
9196         } else {
9197                 /* normal case */
9198                 if (stcb->asoc.last_control_chunk_from == NULL) {
9199                         if (stcb->asoc.alternate) {
9200                                 net = stcb->asoc.alternate;
9201                         } else {
9202                                 net = stcb->asoc.primary_destination;
9203                         }
9204                 } else {
9205                         net = stcb->asoc.last_control_chunk_from;
9206                 }
9207         }
9208         latest_ack->last_sent_to = net;
9209
9210         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9211                 if (ack->data == NULL) {
9212                         continue;
9213                 }
9214                 /* copy the asconf_ack */
9215                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9216                 if (m_ack == NULL) {
9217                         /* couldn't copy it */
9218                         return;
9219                 }
9220 #ifdef SCTP_MBUF_LOGGING
9221                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9222                         struct mbuf *mat;
9223
9224                         mat = m_ack;
9225                         while (mat) {
9226                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9227                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9228                                 }
9229                                 mat = SCTP_BUF_NEXT(mat);
9230                         }
9231                 }
9232 #endif
9233
9234                 sctp_alloc_a_chunk(stcb, chk);
9235                 if (chk == NULL) {
9236                         /* no memory */
9237                         if (m_ack)
9238                                 sctp_m_freem(m_ack);
9239                         return;
9240                 }
9241                 chk->copy_by_ref = 0;
9242
9243                 chk->whoTo = net;
9244                 if (chk->whoTo) {
9245                         atomic_add_int(&chk->whoTo->ref_count, 1);
9246                 }
9247                 chk->data = m_ack;
9248                 chk->send_size = 0;
9249                 /* Get size */
9250                 m = m_ack;
9251                 chk->send_size = ack->len;
9252                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9253                 chk->rec.chunk_id.can_take_data = 1;
9254                 chk->sent = SCTP_DATAGRAM_UNSENT;
9255                 chk->snd_count = 0;
9256                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9257                 chk->asoc = &stcb->asoc;
9258
9259                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9260                 chk->asoc->ctrl_queue_cnt++;
9261         }
9262         return;
9263 }
9264
9265
9266 static int
9267 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9268     struct sctp_tcb *stcb,
9269     struct sctp_association *asoc,
9270     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9271 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9272     SCTP_UNUSED
9273 #endif
9274 )
9275 {
9276         /*-
9277          * send out one MTU of retransmission. If fast_retransmit is
9278          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9279          * rwnd. For a Cookie or Asconf in the control chunk queue we
9280          * retransmit them by themselves.
9281          *
9282          * For data chunks we will pick out the lowest TSN's in the sent_queue
9283          * marked for resend and bundle them all together (up to a MTU of
9284          * destination). The address to send to should have been
9285          * selected/changed where the retransmission was marked (i.e. in FR
9286          * or t3-timeout routines).
9287          */
9288         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9289         struct sctp_tmit_chunk *chk, *fwd;
9290         struct mbuf *m, *endofchain;
9291         struct sctp_nets *net = NULL;
9292         uint32_t tsns_sent = 0;
9293         int no_fragmentflg, bundle_at, cnt_thru;
9294         unsigned int mtu;
9295         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9296         struct sctp_auth_chunk *auth = NULL;
9297         uint32_t auth_offset = 0;
9298         uint16_t auth_keyid;
9299         int override_ok = 1;
9300         int data_auth_reqd = 0;
9301         uint32_t dmtu = 0;
9302
9303         SCTP_TCB_LOCK_ASSERT(stcb);
9304         tmr_started = ctl_cnt = bundle_at = error = 0;
9305         no_fragmentflg = 1;
9306         fwd_tsn = 0;
9307         *cnt_out = 0;
9308         fwd = NULL;
9309         endofchain = m = NULL;
9310         auth_keyid = stcb->asoc.authinfo.active_keyid;
9311 #ifdef SCTP_AUDITING_ENABLED
9312         sctp_audit_log(0xC3, 1);
9313 #endif
9314         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9315             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9316                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9317                     asoc->sent_queue_retran_cnt);
9318                 asoc->sent_queue_cnt = 0;
9319                 asoc->sent_queue_cnt_removeable = 0;
9320                 /* send back 0/0 so we enter normal transmission */
9321                 *cnt_out = 0;
9322                 return (0);
9323         }
9324         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9325                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9326                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9327                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9328                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9329                                 continue;
9330                         }
9331                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9332                                 if (chk != asoc->str_reset) {
9333                                         /*
9334                                          * not eligible for retran if its
9335                                          * not ours
9336                                          */
9337                                         continue;
9338                                 }
9339                         }
9340                         ctl_cnt++;
9341                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9342                                 fwd_tsn = 1;
9343                                 fwd = chk;
9344                         }
9345                         /*
9346                          * Add an AUTH chunk, if chunk requires it save the
9347                          * offset into the chain for AUTH
9348                          */
9349                         if ((auth == NULL) &&
9350                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9351                             stcb->asoc.peer_auth_chunks))) {
9352                                 m = sctp_add_auth_chunk(m, &endofchain,
9353                                     &auth, &auth_offset,
9354                                     stcb,
9355                                     chk->rec.chunk_id.id);
9356                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9357                         }
9358                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9359                         break;
9360                 }
9361         }
9362         one_chunk = 0;
9363         cnt_thru = 0;
9364         /* do we have control chunks to retransmit? */
9365         if (m != NULL) {
9366                 /* Start a timer no matter if we suceed or fail */
9367                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9368                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9369                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9370                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9371                 chk->snd_count++;       /* update our count */
9372                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9373                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9374                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9375                     no_fragmentflg, 0, NULL, 0,
9376                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9377                     chk->whoTo->port, so_locked, NULL, NULL))) {
9378                         SCTP_STAT_INCR(sctps_lowlevelerr);
9379                         return (error);
9380                 }
9381                 m = endofchain = NULL;
9382                 auth = NULL;
9383                 auth_offset = 0;
9384                 /*
9385                  * We don't want to mark the net->sent time here since this
9386                  * we use this for HB and retrans cannot measure RTT
9387                  */
9388                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9389                 *cnt_out += 1;
9390                 chk->sent = SCTP_DATAGRAM_SENT;
9391                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9392                 if (fwd_tsn == 0) {
9393                         return (0);
9394                 } else {
9395                         /* Clean up the fwd-tsn list */
9396                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9397                         return (0);
9398                 }
9399         }
9400         /*
9401          * Ok, it is just data retransmission we need to do or that and a
9402          * fwd-tsn with it all.
9403          */
9404         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9405                 return (SCTP_RETRAN_DONE);
9406         }
9407         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9408             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9409                 /* not yet open, resend the cookie and that is it */
9410                 return (1);
9411         }
9412 #ifdef SCTP_AUDITING_ENABLED
9413         sctp_auditing(20, inp, stcb, NULL);
9414 #endif
9415         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9416         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9417                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9418                         /* No, not sent to this net or not ready for rtx */
9419                         continue;
9420                 }
9421                 if (chk->data == NULL) {
9422                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9423                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9424                         continue;
9425                 }
9426                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9427                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9428                         /* Gak, we have exceeded max unlucky retran, abort! */
9429                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9430                             chk->snd_count,
9431                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9432                         atomic_add_int(&stcb->asoc.refcnt, 1);
9433                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9434                         SCTP_TCB_LOCK(stcb);
9435                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9436                         return (SCTP_RETRAN_EXIT);
9437                 }
9438                 /* pick up the net */
9439                 net = chk->whoTo;
9440                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9441                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9442                 } else {
9443                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9444                 }
9445
9446                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9447                         /* No room in peers rwnd */
9448                         uint32_t tsn;
9449
9450                         tsn = asoc->last_acked_seq + 1;
9451                         if (tsn == chk->rec.data.TSN_seq) {
9452                                 /*
9453                                  * we make a special exception for this
9454                                  * case. The peer has no rwnd but is missing
9455                                  * the lowest chunk.. which is probably what
9456                                  * is holding up the rwnd.
9457                                  */
9458                                 goto one_chunk_around;
9459                         }
9460                         return (1);
9461                 }
9462 one_chunk_around:
9463                 if (asoc->peers_rwnd < mtu) {
9464                         one_chunk = 1;
9465                         if ((asoc->peers_rwnd == 0) &&
9466                             (asoc->total_flight == 0)) {
9467                                 chk->window_probe = 1;
9468                                 chk->whoTo->window_probe = 1;
9469                         }
9470                 }
9471 #ifdef SCTP_AUDITING_ENABLED
9472                 sctp_audit_log(0xC3, 2);
9473 #endif
9474                 bundle_at = 0;
9475                 m = NULL;
9476                 net->fast_retran_ip = 0;
9477                 if (chk->rec.data.doing_fast_retransmit == 0) {
9478                         /*
9479                          * if no FR in progress skip destination that have
9480                          * flight_size > cwnd.
9481                          */
9482                         if (net->flight_size >= net->cwnd) {
9483                                 continue;
9484                         }
9485                 } else {
9486                         /*
9487                          * Mark the destination net to have FR recovery
9488                          * limits put on it.
9489                          */
9490                         *fr_done = 1;
9491                         net->fast_retran_ip = 1;
9492                 }
9493
9494                 /*
9495                  * if no AUTH is yet included and this chunk requires it,
9496                  * make sure to account for it.  We don't apply the size
9497                  * until the AUTH chunk is actually added below in case
9498                  * there is no room for this chunk.
9499                  */
9500                 if (data_auth_reqd && (auth == NULL)) {
9501                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9502                 } else
9503                         dmtu = 0;
9504
9505                 if ((chk->send_size <= (mtu - dmtu)) ||
9506                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9507                         /* ok we will add this one */
9508                         if (data_auth_reqd) {
9509                                 if (auth == NULL) {
9510                                         m = sctp_add_auth_chunk(m,
9511                                             &endofchain,
9512                                             &auth,
9513                                             &auth_offset,
9514                                             stcb,
9515                                             SCTP_DATA);
9516                                         auth_keyid = chk->auth_keyid;
9517                                         override_ok = 0;
9518                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9519                                 } else if (override_ok) {
9520                                         auth_keyid = chk->auth_keyid;
9521                                         override_ok = 0;
9522                                 } else if (chk->auth_keyid != auth_keyid) {
9523                                         /* different keyid, so done bundling */
9524                                         break;
9525                                 }
9526                         }
9527                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9528                         if (m == NULL) {
9529                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9530                                 return (ENOMEM);
9531                         }
9532                         /* Do clear IP_DF ? */
9533                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9534                                 no_fragmentflg = 0;
9535                         }
9536                         /* upate our MTU size */
9537                         if (mtu > (chk->send_size + dmtu))
9538                                 mtu -= (chk->send_size + dmtu);
9539                         else
9540                                 mtu = 0;
9541                         data_list[bundle_at++] = chk;
9542                         if (one_chunk && (asoc->total_flight <= 0)) {
9543                                 SCTP_STAT_INCR(sctps_windowprobed);
9544                         }
9545                 }
9546                 if (one_chunk == 0) {
9547                         /*
9548                          * now are there anymore forward from chk to pick
9549                          * up?
9550                          */
9551                         fwd = TAILQ_NEXT(chk, sctp_next);
9552                         while (fwd) {
9553                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9554                                         /* Nope, not for retran */
9555                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9556                                         continue;
9557                                 }
9558                                 if (fwd->whoTo != net) {
9559                                         /* Nope, not the net in question */
9560                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9561                                         continue;
9562                                 }
9563                                 if (data_auth_reqd && (auth == NULL)) {
9564                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9565                                 } else
9566                                         dmtu = 0;
9567                                 if (fwd->send_size <= (mtu - dmtu)) {
9568                                         if (data_auth_reqd) {
9569                                                 if (auth == NULL) {
9570                                                         m = sctp_add_auth_chunk(m,
9571                                                             &endofchain,
9572                                                             &auth,
9573                                                             &auth_offset,
9574                                                             stcb,
9575                                                             SCTP_DATA);
9576                                                         auth_keyid = fwd->auth_keyid;
9577                                                         override_ok = 0;
9578                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9579                                                 } else if (override_ok) {
9580                                                         auth_keyid = fwd->auth_keyid;
9581                                                         override_ok = 0;
9582                                                 } else if (fwd->auth_keyid != auth_keyid) {
9583                                                         /*
9584                                                          * different keyid,
9585                                                          * so done bundling
9586                                                          */
9587                                                         break;
9588                                                 }
9589                                         }
9590                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9591                                         if (m == NULL) {
9592                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9593                                                 return (ENOMEM);
9594                                         }
9595                                         /* Do clear IP_DF ? */
9596                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9597                                                 no_fragmentflg = 0;
9598                                         }
9599                                         /* upate our MTU size */
9600                                         if (mtu > (fwd->send_size + dmtu))
9601                                                 mtu -= (fwd->send_size + dmtu);
9602                                         else
9603                                                 mtu = 0;
9604                                         data_list[bundle_at++] = fwd;
9605                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9606                                                 break;
9607                                         }
9608                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9609                                 } else {
9610                                         /* can't fit so we are done */
9611                                         break;
9612                                 }
9613                         }
9614                 }
9615                 /* Is there something to send for this destination? */
9616                 if (m) {
9617                         /*
9618                          * No matter if we fail/or suceed we should start a
9619                          * timer. A failure is like a lost IP packet :-)
9620                          */
9621                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9622                                 /*
9623                                  * no timer running on this destination
9624                                  * restart it.
9625                                  */
9626                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9627                                 tmr_started = 1;
9628                         }
9629                         /* Now lets send it, if there is anything to send :> */
9630                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9631                             (struct sockaddr *)&net->ro._l_addr, m,
9632                             auth_offset, auth, auth_keyid,
9633                             no_fragmentflg, 0, NULL, 0,
9634                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9635                             net->port, so_locked, NULL, NULL))) {
9636                                 /* error, we could not output */
9637                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9638                                 return (error);
9639                         }
9640                         m = endofchain = NULL;
9641                         auth = NULL;
9642                         auth_offset = 0;
9643                         /* For HB's */
9644                         /*
9645                          * We don't want to mark the net->sent time here
9646                          * since this we use this for HB and retrans cannot
9647                          * measure RTT
9648                          */
9649                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9650
9651                         /* For auto-close */
9652                         cnt_thru++;
9653                         if (*now_filled == 0) {
9654                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9655                                 *now = asoc->time_last_sent;
9656                                 *now_filled = 1;
9657                         } else {
9658                                 asoc->time_last_sent = *now;
9659                         }
9660                         *cnt_out += bundle_at;
9661 #ifdef SCTP_AUDITING_ENABLED
9662                         sctp_audit_log(0xC4, bundle_at);
9663 #endif
9664                         if (bundle_at) {
9665                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9666                         }
9667                         for (i = 0; i < bundle_at; i++) {
9668                                 SCTP_STAT_INCR(sctps_sendretransdata);
9669                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9670                                 /*
9671                                  * When we have a revoked data, and we
9672                                  * retransmit it, then we clear the revoked
9673                                  * flag since this flag dictates if we
9674                                  * subtracted from the fs
9675                                  */
9676                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9677                                         /* Deflate the cwnd */
9678                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9679                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9680                                 }
9681                                 data_list[i]->snd_count++;
9682                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9683                                 /* record the time */
9684                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9685                                 if (data_list[i]->book_size_scale) {
9686                                         /*
9687                                          * need to double the book size on
9688                                          * this one
9689                                          */
9690                                         data_list[i]->book_size_scale = 0;
9691                                         /*
9692                                          * Since we double the booksize, we
9693                                          * must also double the output queue
9694                                          * size, since this get shrunk when
9695                                          * we free by this amount.
9696                                          */
9697                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9698                                         data_list[i]->book_size *= 2;
9699
9700
9701                                 } else {
9702                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9703                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9704                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9705                                         }
9706                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9707                                             (uint32_t) (data_list[i]->send_size +
9708                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9709                                 }
9710                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9711                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9712                                             data_list[i]->whoTo->flight_size,
9713                                             data_list[i]->book_size,
9714                                             (uintptr_t) data_list[i]->whoTo,
9715                                             data_list[i]->rec.data.TSN_seq);
9716                                 }
9717                                 sctp_flight_size_increase(data_list[i]);
9718                                 sctp_total_flight_increase(stcb, data_list[i]);
9719                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9720                                         /* SWS sender side engages */
9721                                         asoc->peers_rwnd = 0;
9722                                 }
9723                                 if ((i == 0) &&
9724                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9725                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9726                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9727                                             (tmr_started == 0)) {
9728                                                 /*-
9729                                                  * ok we just fast-retrans'd
9730                                                  * the lowest TSN, i.e the
9731                                                  * first on the list. In
9732                                                  * this case we want to give
9733                                                  * some more time to get a
9734                                                  * SACK back without a
9735                                                  * t3-expiring.
9736                                                  */
9737                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9738                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9739                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9740                                         }
9741                                 }
9742                         }
9743                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9744                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9745                         }
9746 #ifdef SCTP_AUDITING_ENABLED
9747                         sctp_auditing(21, inp, stcb, NULL);
9748 #endif
9749                 } else {
9750                         /* None will fit */
9751                         return (1);
9752                 }
9753                 if (asoc->sent_queue_retran_cnt <= 0) {
9754                         /* all done we have no more to retran */
9755                         asoc->sent_queue_retran_cnt = 0;
9756                         break;
9757                 }
9758                 if (one_chunk) {
9759                         /* No more room in rwnd */
9760                         return (1);
9761                 }
9762                 /* stop the for loop here. we sent out a packet */
9763                 break;
9764         }
9765         return (0);
9766 }
9767
9768
9769 static int
9770 sctp_timer_validation(struct sctp_inpcb *inp,
9771     struct sctp_tcb *stcb,
9772     struct sctp_association *asoc,
9773     int ret)
9774 {
9775         struct sctp_nets *net;
9776
9777         /* Validate that a timer is running somewhere */
9778         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9779                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9780                         /* Here is a timer */
9781                         return (ret);
9782                 }
9783         }
9784         SCTP_TCB_LOCK_ASSERT(stcb);
9785         /* Gak, we did not have a timer somewhere */
9786         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9787         if (asoc->alternate) {
9788                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9789         } else {
9790                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9791         }
9792         return (ret);
9793 }
9794
9795 void
9796 sctp_chunk_output(struct sctp_inpcb *inp,
9797     struct sctp_tcb *stcb,
9798     int from_where,
9799     int so_locked
9800 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9801     SCTP_UNUSED
9802 #endif
9803 )
9804 {
9805         /*-
9806          * Ok this is the generic chunk service queue. we must do the
9807          * following:
9808          * - See if there are retransmits pending, if so we must
9809          *   do these first.
9810          * - Service the stream queue that is next, moving any
9811          *   message (note I must get a complete message i.e.
9812          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9813          *   TSN's
9814          * - Check to see if the cwnd/rwnd allows any output, if so we
9815          *   go ahead and fomulate and send the low level chunks. Making sure
9816          *   to combine any control in the control chunk queue also.
9817          */
9818         struct sctp_association *asoc;
9819         struct sctp_nets *net;
9820         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9821         unsigned int burst_cnt = 0;
9822         struct timeval now;
9823         int now_filled = 0;
9824         int nagle_on = 0;
9825         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9826         int un_sent = 0;
9827         int fr_done;
9828         unsigned int tot_frs = 0;
9829
9830         asoc = &stcb->asoc;
9831         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9832                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9833                         nagle_on = 0;
9834                 } else {
9835                         nagle_on = 1;
9836                 }
9837         }
9838         SCTP_TCB_LOCK_ASSERT(stcb);
9839
9840         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9841
9842         if ((un_sent <= 0) &&
9843             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9844             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9845             (asoc->sent_queue_retran_cnt == 0)) {
9846                 /* Nothing to do unless there is something to be sent left */
9847                 return;
9848         }
9849         /*
9850          * Do we have something to send, data or control AND a sack timer
9851          * running, if so piggy-back the sack.
9852          */
9853         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9854                 sctp_send_sack(stcb, so_locked);
9855                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9856         }
9857         while (asoc->sent_queue_retran_cnt) {
9858                 /*-
9859                  * Ok, it is retransmission time only, we send out only ONE
9860                  * packet with a single call off to the retran code.
9861                  */
9862                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9863                         /*-
9864                          * Special hook for handling cookiess discarded
9865                          * by peer that carried data. Send cookie-ack only
9866                          * and then the next call with get the retran's.
9867                          */
9868                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9869                             from_where,
9870                             &now, &now_filled, frag_point, so_locked);
9871                         return;
9872                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9873                         /* if its not from a HB then do it */
9874                         fr_done = 0;
9875                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9876                         if (fr_done) {
9877                                 tot_frs++;
9878                         }
9879                 } else {
9880                         /*
9881                          * its from any other place, we don't allow retran
9882                          * output (only control)
9883                          */
9884                         ret = 1;
9885                 }
9886                 if (ret > 0) {
9887                         /* Can't send anymore */
9888                         /*-
9889                          * now lets push out control by calling med-level
9890                          * output once. this assures that we WILL send HB's
9891                          * if queued too.
9892                          */
9893                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9894                             from_where,
9895                             &now, &now_filled, frag_point, so_locked);
9896 #ifdef SCTP_AUDITING_ENABLED
9897                         sctp_auditing(8, inp, stcb, NULL);
9898 #endif
9899                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9900                         return;
9901                 }
9902                 if (ret < 0) {
9903                         /*-
9904                          * The count was off.. retran is not happening so do
9905                          * the normal retransmission.
9906                          */
9907 #ifdef SCTP_AUDITING_ENABLED
9908                         sctp_auditing(9, inp, stcb, NULL);
9909 #endif
9910                         if (ret == SCTP_RETRAN_EXIT) {
9911                                 return;
9912                         }
9913                         break;
9914                 }
9915                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9916                         /* Only one transmission allowed out of a timeout */
9917 #ifdef SCTP_AUDITING_ENABLED
9918                         sctp_auditing(10, inp, stcb, NULL);
9919 #endif
9920                         /* Push out any control */
9921                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9922                             &now, &now_filled, frag_point, so_locked);
9923                         return;
9924                 }
9925                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9926                         /* Hit FR burst limit */
9927                         return;
9928                 }
9929                 if ((num_out == 0) && (ret == 0)) {
9930                         /* No more retrans to send */
9931                         break;
9932                 }
9933         }
9934 #ifdef SCTP_AUDITING_ENABLED
9935         sctp_auditing(12, inp, stcb, NULL);
9936 #endif
9937         /* Check for bad destinations, if they exist move chunks around. */
9938         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9939                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9940                         /*-
9941                          * if possible move things off of this address we
9942                          * still may send below due to the dormant state but
9943                          * we try to find an alternate address to send to
9944                          * and if we have one we move all queued data on the
9945                          * out wheel to this alternate address.
9946                          */
9947                         if (net->ref_count > 1)
9948                                 sctp_move_chunks_from_net(stcb, net);
9949                 } else {
9950                         /*-
9951                          * if ((asoc->sat_network) || (net->addr_is_local))
9952                          * { burst_limit = asoc->max_burst *
9953                          * SCTP_SAT_NETWORK_BURST_INCR; }
9954                          */
9955                         if (asoc->max_burst > 0) {
9956                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9957                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9958                                                 /*
9959                                                  * JRS - Use the congestion
9960                                                  * control given in the
9961                                                  * congestion control module
9962                                                  */
9963                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9964                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9965                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9966                                                 }
9967                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9968                                         }
9969                                         net->fast_retran_ip = 0;
9970                                 } else {
9971                                         if (net->flight_size == 0) {
9972                                                 /*
9973                                                  * Should be decaying the
9974                                                  * cwnd here
9975                                                  */
9976                                                 ;
9977                                         }
9978                                 }
9979                         }
9980                 }
9981
9982         }
9983         burst_cnt = 0;
9984         do {
9985                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9986                     &reason_code, 0, from_where,
9987                     &now, &now_filled, frag_point, so_locked);
9988                 if (error) {
9989                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9990                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9991                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9992                         }
9993                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9994                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9995                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9996                         }
9997                         break;
9998                 }
9999                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10000
10001                 tot_out += num_out;
10002                 burst_cnt++;
10003                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10004                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10005                         if (num_out == 0) {
10006                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10007                         }
10008                 }
10009                 if (nagle_on) {
10010                         /*-
10011                          * When nagle is on, we look at how much is un_sent, then
10012                          * if its smaller than an MTU and we have data in
10013                          * flight we stop.
10014                          */
10015                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10016                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10017                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10018                             (stcb->asoc.total_flight > 0)) {
10019                                 break;
10020                         }
10021                 }
10022                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10023                     TAILQ_EMPTY(&asoc->send_queue) &&
10024                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10025                         /* Nothing left to send */
10026                         break;
10027                 }
10028                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10029                         /* Nothing left to send */
10030                         break;
10031                 }
10032         } while (num_out &&
10033             ((asoc->max_burst == 0) ||
10034             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10035             (burst_cnt < asoc->max_burst)));
10036
10037         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10038                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10039                         SCTP_STAT_INCR(sctps_maxburstqueued);
10040                         asoc->burst_limit_applied = 1;
10041                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10042                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10043                         }
10044                 } else {
10045                         asoc->burst_limit_applied = 0;
10046                 }
10047         }
10048         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10049                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10050         }
10051         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10052             tot_out);
10053
10054         /*-
10055          * Now we need to clean up the control chunk chain if a ECNE is on
10056          * it. It must be marked as UNSENT again so next call will continue
10057          * to send it until such time that we get a CWR, to remove it.
10058          */
10059         if (stcb->asoc.ecn_echo_cnt_onq)
10060                 sctp_fix_ecn_echo(asoc);
10061         return;
10062 }
10063
10064
10065 int
10066 sctp_output(inp, m, addr, control, p, flags)
10067         struct sctp_inpcb *inp;
10068         struct mbuf *m;
10069         struct sockaddr *addr;
10070         struct mbuf *control;
10071         struct thread *p;
10072         int flags;
10073 {
10074         if (inp == NULL) {
10075                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10076                 return (EINVAL);
10077         }
10078         if (inp->sctp_socket == NULL) {
10079                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10080                 return (EINVAL);
10081         }
10082         return (sctp_sosend(inp->sctp_socket,
10083             addr,
10084             (struct uio *)NULL,
10085             m,
10086             control,
10087             flags, p
10088             ));
10089 }
10090
10091 void
10092 send_forward_tsn(struct sctp_tcb *stcb,
10093     struct sctp_association *asoc)
10094 {
10095         struct sctp_tmit_chunk *chk;
10096         struct sctp_forward_tsn_chunk *fwdtsn;
10097         uint32_t advance_peer_ack_point;
10098
10099         SCTP_TCB_LOCK_ASSERT(stcb);
10100         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10101                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10102                         /* mark it to unsent */
10103                         chk->sent = SCTP_DATAGRAM_UNSENT;
10104                         chk->snd_count = 0;
10105                         /* Do we correct its output location? */
10106                         if (chk->whoTo) {
10107                                 sctp_free_remote_addr(chk->whoTo);
10108                                 chk->whoTo = NULL;
10109                         }
10110                         goto sctp_fill_in_rest;
10111                 }
10112         }
10113         /* Ok if we reach here we must build one */
10114         sctp_alloc_a_chunk(stcb, chk);
10115         if (chk == NULL) {
10116                 return;
10117         }
10118         asoc->fwd_tsn_cnt++;
10119         chk->copy_by_ref = 0;
10120         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10121         chk->rec.chunk_id.can_take_data = 0;
10122         chk->asoc = asoc;
10123         chk->whoTo = NULL;
10124         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10125         if (chk->data == NULL) {
10126                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10127                 return;
10128         }
10129         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10130         chk->sent = SCTP_DATAGRAM_UNSENT;
10131         chk->snd_count = 0;
10132         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10133         asoc->ctrl_queue_cnt++;
10134 sctp_fill_in_rest:
10135         /*-
10136          * Here we go through and fill out the part that deals with
10137          * stream/seq of the ones we skip.
10138          */
10139         SCTP_BUF_LEN(chk->data) = 0;
10140         {
10141                 struct sctp_tmit_chunk *at, *tp1, *last;
10142                 struct sctp_strseq *strseq;
10143                 unsigned int cnt_of_space, i, ovh;
10144                 unsigned int space_needed;
10145                 unsigned int cnt_of_skipped = 0;
10146
10147                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10148                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10149                                 /* no more to look at */
10150                                 break;
10151                         }
10152                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10153                                 /* We don't report these */
10154                                 continue;
10155                         }
10156                         cnt_of_skipped++;
10157                 }
10158                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10159                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10160
10161                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10162
10163                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10164                         ovh = SCTP_MIN_OVERHEAD;
10165                 } else {
10166                         ovh = SCTP_MIN_V4_OVERHEAD;
10167                 }
10168                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10169                         /* trim to a mtu size */
10170                         cnt_of_space = asoc->smallest_mtu - ovh;
10171                 }
10172                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10173                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10174                             0xff, 0, cnt_of_skipped,
10175                             asoc->advanced_peer_ack_point);
10176
10177                 }
10178                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10179                 if (cnt_of_space < space_needed) {
10180                         /*-
10181                          * ok we must trim down the chunk by lowering the
10182                          * advance peer ack point.
10183                          */
10184                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10185                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10186                                     0xff, 0xff, cnt_of_space,
10187                                     space_needed);
10188                         }
10189                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10190                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10191                         /*-
10192                          * Go through and find the TSN that will be the one
10193                          * we report.
10194                          */
10195                         at = TAILQ_FIRST(&asoc->sent_queue);
10196                         for (i = 0; i < cnt_of_skipped; i++) {
10197                                 tp1 = TAILQ_NEXT(at, sctp_next);
10198                                 if (tp1 == NULL) {
10199                                         break;
10200                                 }
10201                                 at = tp1;
10202                         }
10203                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10204                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10205                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10206                                     asoc->advanced_peer_ack_point);
10207                         }
10208                         last = at;
10209                         /*-
10210                          * last now points to last one I can report, update
10211                          * peer ack point
10212                          */
10213                         if (last)
10214                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10215                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10216                             cnt_of_skipped * sizeof(struct sctp_strseq);
10217                 }
10218                 chk->send_size = space_needed;
10219                 /* Setup the chunk */
10220                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10221                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10222                 fwdtsn->ch.chunk_flags = 0;
10223                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10224                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10225                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10226                 fwdtsn++;
10227                 /*-
10228                  * Move pointer to after the fwdtsn and transfer to the
10229                  * strseq pointer.
10230                  */
10231                 strseq = (struct sctp_strseq *)fwdtsn;
10232                 /*-
10233                  * Now populate the strseq list. This is done blindly
10234                  * without pulling out duplicate stream info. This is
10235                  * inefficent but won't harm the process since the peer will
10236                  * look at these in sequence and will thus release anything.
10237                  * It could mean we exceed the PMTU and chop off some that
10238                  * we could have included.. but this is unlikely (aka 1432/4
10239                  * would mean 300+ stream seq's would have to be reported in
10240                  * one FWD-TSN. With a bit of work we can later FIX this to
10241                  * optimize and pull out duplcates.. but it does add more
10242                  * overhead. So for now... not!
10243                  */
10244                 at = TAILQ_FIRST(&asoc->sent_queue);
10245                 for (i = 0; i < cnt_of_skipped; i++) {
10246                         tp1 = TAILQ_NEXT(at, sctp_next);
10247                         if (tp1 == NULL)
10248                                 break;
10249                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10250                                 /* We don't report these */
10251                                 i--;
10252                                 at = tp1;
10253                                 continue;
10254                         }
10255                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10256                                 at->rec.data.fwd_tsn_cnt = 0;
10257                         }
10258                         strseq->stream = ntohs(at->rec.data.stream_number);
10259                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10260                         strseq++;
10261                         at = tp1;
10262                 }
10263         }
10264         return;
10265
10266 }
10267
10268 void
10269 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10270 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10271     SCTP_UNUSED
10272 #endif
10273 )
10274 {
10275         /*-
10276          * Queue up a SACK or NR-SACK in the control queue.
10277          * We must first check to see if a SACK or NR-SACK is
10278          * somehow on the control queue.
10279          * If so, we will take and and remove the old one.
10280          */
10281         struct sctp_association *asoc;
10282         struct sctp_tmit_chunk *chk, *a_chk;
10283         struct sctp_sack_chunk *sack;
10284         struct sctp_nr_sack_chunk *nr_sack;
10285         struct sctp_gap_ack_block *gap_descriptor;
10286         struct sack_track *selector;
10287         int mergeable = 0;
10288         int offset;
10289         caddr_t limit;
10290         uint32_t *dup;
10291         int limit_reached = 0;
10292         unsigned int i, siz, j;
10293         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10294         int num_dups = 0;
10295         int space_req;
10296         uint32_t highest_tsn;
10297         uint8_t flags;
10298         uint8_t type;
10299         uint8_t tsn_map;
10300
10301         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10302             (stcb->asoc.peer_supports_nr_sack == 1)) {
10303                 type = SCTP_NR_SELECTIVE_ACK;
10304         } else {
10305                 type = SCTP_SELECTIVE_ACK;
10306         }
10307         a_chk = NULL;
10308         asoc = &stcb->asoc;
10309         SCTP_TCB_LOCK_ASSERT(stcb);
10310         if (asoc->last_data_chunk_from == NULL) {
10311                 /* Hmm we never received anything */
10312                 return;
10313         }
10314         sctp_slide_mapping_arrays(stcb);
10315         sctp_set_rwnd(stcb, asoc);
10316         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10317                 if (chk->rec.chunk_id.id == type) {
10318                         /* Hmm, found a sack already on queue, remove it */
10319                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10320                         asoc->ctrl_queue_cnt--;
10321                         a_chk = chk;
10322                         if (a_chk->data) {
10323                                 sctp_m_freem(a_chk->data);
10324                                 a_chk->data = NULL;
10325                         }
10326                         if (a_chk->whoTo) {
10327                                 sctp_free_remote_addr(a_chk->whoTo);
10328                                 a_chk->whoTo = NULL;
10329                         }
10330                         break;
10331                 }
10332         }
10333         if (a_chk == NULL) {
10334                 sctp_alloc_a_chunk(stcb, a_chk);
10335                 if (a_chk == NULL) {
10336                         /* No memory so we drop the idea, and set a timer */
10337                         if (stcb->asoc.delayed_ack) {
10338                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10339                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10340                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10341                                     stcb->sctp_ep, stcb, NULL);
10342                         } else {
10343                                 stcb->asoc.send_sack = 1;
10344                         }
10345                         return;
10346                 }
10347                 a_chk->copy_by_ref = 0;
10348                 a_chk->rec.chunk_id.id = type;
10349                 a_chk->rec.chunk_id.can_take_data = 1;
10350         }
10351         /* Clear our pkt counts */
10352         asoc->data_pkts_seen = 0;
10353
10354         a_chk->asoc = asoc;
10355         a_chk->snd_count = 0;
10356         a_chk->send_size = 0;   /* fill in later */
10357         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10358         a_chk->whoTo = NULL;
10359
10360         if ((asoc->numduptsns) ||
10361             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10362                 /*-
10363                  * Ok, we have some duplicates or the destination for the
10364                  * sack is unreachable, lets see if we can select an
10365                  * alternate than asoc->last_data_chunk_from
10366                  */
10367                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10368                     (asoc->used_alt_onsack > asoc->numnets)) {
10369                         /* We used an alt last time, don't this time */
10370                         a_chk->whoTo = NULL;
10371                 } else {
10372                         asoc->used_alt_onsack++;
10373                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10374                 }
10375                 if (a_chk->whoTo == NULL) {
10376                         /* Nope, no alternate */
10377                         a_chk->whoTo = asoc->last_data_chunk_from;
10378                         asoc->used_alt_onsack = 0;
10379                 }
10380         } else {
10381                 /*
10382                  * No duplicates so we use the last place we received data
10383                  * from.
10384                  */
10385                 asoc->used_alt_onsack = 0;
10386                 a_chk->whoTo = asoc->last_data_chunk_from;
10387         }
10388         if (a_chk->whoTo) {
10389                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10390         }
10391         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10392                 highest_tsn = asoc->highest_tsn_inside_map;
10393         } else {
10394                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10395         }
10396         if (highest_tsn == asoc->cumulative_tsn) {
10397                 /* no gaps */
10398                 if (type == SCTP_SELECTIVE_ACK) {
10399                         space_req = sizeof(struct sctp_sack_chunk);
10400                 } else {
10401                         space_req = sizeof(struct sctp_nr_sack_chunk);
10402                 }
10403         } else {
10404                 /* gaps get a cluster */
10405                 space_req = MCLBYTES;
10406         }
10407         /* Ok now lets formulate a MBUF with our sack */
10408         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10409         if ((a_chk->data == NULL) ||
10410             (a_chk->whoTo == NULL)) {
10411                 /* rats, no mbuf memory */
10412                 if (a_chk->data) {
10413                         /* was a problem with the destination */
10414                         sctp_m_freem(a_chk->data);
10415                         a_chk->data = NULL;
10416                 }
10417                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10418                 /* sa_ignore NO_NULL_CHK */
10419                 if (stcb->asoc.delayed_ack) {
10420                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10421                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10422                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10423                             stcb->sctp_ep, stcb, NULL);
10424                 } else {
10425                         stcb->asoc.send_sack = 1;
10426                 }
10427                 return;
10428         }
10429         /* ok, lets go through and fill it in */
10430         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10431         space = M_TRAILINGSPACE(a_chk->data);
10432         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10433                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10434         }
10435         limit = mtod(a_chk->data, caddr_t);
10436         limit += space;
10437
10438         flags = 0;
10439
10440         if ((asoc->sctp_cmt_on_off > 0) &&
10441             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10442                 /*-
10443                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10444                  * received, then set high bit to 1, else 0. Reset
10445                  * pkts_rcvd.
10446                  */
10447                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10448                 asoc->cmt_dac_pkts_rcvd = 0;
10449         }
10450 #ifdef SCTP_ASOCLOG_OF_TSNS
10451         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10452         stcb->asoc.cumack_log_atsnt++;
10453         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10454                 stcb->asoc.cumack_log_atsnt = 0;
10455         }
10456 #endif
10457         /* reset the readers interpretation */
10458         stcb->freed_by_sorcv_sincelast = 0;
10459
10460         if (type == SCTP_SELECTIVE_ACK) {
10461                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10462                 nr_sack = NULL;
10463                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10464                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10465                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10466                 } else {
10467                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10468                 }
10469         } else {
10470                 sack = NULL;
10471                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10472                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10473                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10474                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10475                 } else {
10476                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10477                 }
10478         }
10479
10480         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10481                 offset = 1;
10482         } else {
10483                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10484         }
10485         if (((type == SCTP_SELECTIVE_ACK) &&
10486             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10487             ((type == SCTP_NR_SELECTIVE_ACK) &&
10488             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10489                 /* we have a gap .. maybe */
10490                 for (i = 0; i < siz; i++) {
10491                         tsn_map = asoc->mapping_array[i];
10492                         if (type == SCTP_SELECTIVE_ACK) {
10493                                 tsn_map |= asoc->nr_mapping_array[i];
10494                         }
10495                         if (i == 0) {
10496                                 /*
10497                                  * Clear all bits corresponding to TSNs
10498                                  * smaller or equal to the cumulative TSN.
10499                                  */
10500                                 tsn_map &= (~0 << (1 - offset));
10501                         }
10502                         selector = &sack_array[tsn_map];
10503                         if (mergeable && selector->right_edge) {
10504                                 /*
10505                                  * Backup, left and right edges were ok to
10506                                  * merge.
10507                                  */
10508                                 num_gap_blocks--;
10509                                 gap_descriptor--;
10510                         }
10511                         if (selector->num_entries == 0)
10512                                 mergeable = 0;
10513                         else {
10514                                 for (j = 0; j < selector->num_entries; j++) {
10515                                         if (mergeable && selector->right_edge) {
10516                                                 /*
10517                                                  * do a merge by NOT setting
10518                                                  * the left side
10519                                                  */
10520                                                 mergeable = 0;
10521                                         } else {
10522                                                 /*
10523                                                  * no merge, set the left
10524                                                  * side
10525                                                  */
10526                                                 mergeable = 0;
10527                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10528                                         }
10529                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10530                                         num_gap_blocks++;
10531                                         gap_descriptor++;
10532                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10533                                                 /* no more room */
10534                                                 limit_reached = 1;
10535                                                 break;
10536                                         }
10537                                 }
10538                                 if (selector->left_edge) {
10539                                         mergeable = 1;
10540                                 }
10541                         }
10542                         if (limit_reached) {
10543                                 /* Reached the limit stop */
10544                                 break;
10545                         }
10546                         offset += 8;
10547                 }
10548         }
10549         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10550             (limit_reached == 0)) {
10551
10552                 mergeable = 0;
10553
10554                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10555                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10556                 } else {
10557                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10558                 }
10559
10560                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10561                         offset = 1;
10562                 } else {
10563                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10564                 }
10565                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10566                         /* we have a gap .. maybe */
10567                         for (i = 0; i < siz; i++) {
10568                                 tsn_map = asoc->nr_mapping_array[i];
10569                                 if (i == 0) {
10570                                         /*
10571                                          * Clear all bits corresponding to
10572                                          * TSNs smaller or equal to the
10573                                          * cumulative TSN.
10574                                          */
10575                                         tsn_map &= (~0 << (1 - offset));
10576                                 }
10577                                 selector = &sack_array[tsn_map];
10578                                 if (mergeable && selector->right_edge) {
10579                                         /*
10580                                          * Backup, left and right edges were
10581                                          * ok to merge.
10582                                          */
10583                                         num_nr_gap_blocks--;
10584                                         gap_descriptor--;
10585                                 }
10586                                 if (selector->num_entries == 0)
10587                                         mergeable = 0;
10588                                 else {
10589                                         for (j = 0; j < selector->num_entries; j++) {
10590                                                 if (mergeable && selector->right_edge) {
10591                                                         /*
10592                                                          * do a merge by NOT
10593                                                          * setting the left
10594                                                          * side
10595                                                          */
10596                                                         mergeable = 0;
10597                                                 } else {
10598                                                         /*
10599                                                          * no merge, set the
10600                                                          * left side
10601                                                          */
10602                                                         mergeable = 0;
10603                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10604                                                 }
10605                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10606                                                 num_nr_gap_blocks++;
10607                                                 gap_descriptor++;
10608                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10609                                                         /* no more room */
10610                                                         limit_reached = 1;
10611                                                         break;
10612                                                 }
10613                                         }
10614                                         if (selector->left_edge) {
10615                                                 mergeable = 1;
10616                                         }
10617                                 }
10618                                 if (limit_reached) {
10619                                         /* Reached the limit stop */
10620                                         break;
10621                                 }
10622                                 offset += 8;
10623                         }
10624                 }
10625         }
10626         /* now we must add any dups we are going to report. */
10627         if ((limit_reached == 0) && (asoc->numduptsns)) {
10628                 dup = (uint32_t *) gap_descriptor;
10629                 for (i = 0; i < asoc->numduptsns; i++) {
10630                         *dup = htonl(asoc->dup_tsns[i]);
10631                         dup++;
10632                         num_dups++;
10633                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10634                                 /* no more room */
10635                                 break;
10636                         }
10637                 }
10638                 asoc->numduptsns = 0;
10639         }
10640         /*
10641          * now that the chunk is prepared queue it to the control chunk
10642          * queue.
10643          */
10644         if (type == SCTP_SELECTIVE_ACK) {
10645                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10646                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10647                     num_dups * sizeof(int32_t);
10648                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10649                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10650                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10651                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10652                 sack->sack.num_dup_tsns = htons(num_dups);
10653                 sack->ch.chunk_type = type;
10654                 sack->ch.chunk_flags = flags;
10655                 sack->ch.chunk_length = htons(a_chk->send_size);
10656         } else {
10657                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10658                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10659                     num_dups * sizeof(int32_t);
10660                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10661                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10662                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10663                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10664                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10665                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10666                 nr_sack->nr_sack.reserved = 0;
10667                 nr_sack->ch.chunk_type = type;
10668                 nr_sack->ch.chunk_flags = flags;
10669                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10670         }
10671         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10672         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10673         asoc->ctrl_queue_cnt++;
10674         asoc->send_sack = 0;
10675         SCTP_STAT_INCR(sctps_sendsacks);
10676         return;
10677 }
10678
10679 void
10680 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10681 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10682     SCTP_UNUSED
10683 #endif
10684 )
10685 {
10686         struct mbuf *m_abort;
10687         struct mbuf *m_out = NULL, *m_end = NULL;
10688         struct sctp_abort_chunk *abort = NULL;
10689         int sz;
10690         uint32_t auth_offset = 0;
10691         struct sctp_auth_chunk *auth = NULL;
10692         struct sctp_nets *net;
10693
10694         /*-
10695          * Add an AUTH chunk, if chunk requires it and save the offset into
10696          * the chain for AUTH
10697          */
10698         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10699             stcb->asoc.peer_auth_chunks)) {
10700                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10701                     stcb, SCTP_ABORT_ASSOCIATION);
10702                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10703         }
10704         SCTP_TCB_LOCK_ASSERT(stcb);
10705         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10706         if (m_abort == NULL) {
10707                 /* no mbuf's */
10708                 if (m_out)
10709                         sctp_m_freem(m_out);
10710                 return;
10711         }
10712         /* link in any error */
10713         SCTP_BUF_NEXT(m_abort) = operr;
10714         sz = 0;
10715         if (operr) {
10716                 struct mbuf *n;
10717
10718                 n = operr;
10719                 while (n) {
10720                         sz += SCTP_BUF_LEN(n);
10721                         n = SCTP_BUF_NEXT(n);
10722                 }
10723         }
10724         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10725         if (m_out == NULL) {
10726                 /* NO Auth chunk prepended, so reserve space in front */
10727                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10728                 m_out = m_abort;
10729         } else {
10730                 /* Put AUTH chunk at the front of the chain */
10731                 SCTP_BUF_NEXT(m_end) = m_abort;
10732         }
10733         if (stcb->asoc.alternate) {
10734                 net = stcb->asoc.alternate;
10735         } else {
10736                 net = stcb->asoc.primary_destination;
10737         }
10738         /* fill in the ABORT chunk */
10739         abort = mtod(m_abort, struct sctp_abort_chunk *);
10740         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10741         abort->ch.chunk_flags = 0;
10742         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10743
10744         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10745             (struct sockaddr *)&net->ro._l_addr,
10746             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10747             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10748             stcb->asoc.primary_destination->port, so_locked, NULL, NULL);
10749         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10750 }
10751
10752 void
10753 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10754     struct sctp_nets *net,
10755     int reflect_vtag)
10756 {
10757         /* formulate and SEND a SHUTDOWN-COMPLETE */
10758         struct mbuf *m_shutdown_comp;
10759         struct sctp_shutdown_complete_chunk *shutdown_complete;
10760         uint32_t vtag;
10761         uint8_t flags;
10762
10763         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10764         if (m_shutdown_comp == NULL) {
10765                 /* no mbuf's */
10766                 return;
10767         }
10768         if (reflect_vtag) {
10769                 flags = SCTP_HAD_NO_TCB;
10770                 vtag = stcb->asoc.my_vtag;
10771         } else {
10772                 flags = 0;
10773                 vtag = stcb->asoc.peer_vtag;
10774         }
10775         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10776         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10777         shutdown_complete->ch.chunk_flags = flags;
10778         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10779         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10780         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10781             (struct sockaddr *)&net->ro._l_addr,
10782             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10783             stcb->sctp_ep->sctp_lport, stcb->rport,
10784             htonl(vtag),
10785             net->port, SCTP_SO_NOT_LOCKED, NULL, NULL);
10786         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10787         return;
10788 }
10789
10790 void
10791 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10792     uint32_t vrf_id, uint16_t port)
10793 {
10794         /* formulate and SEND a SHUTDOWN-COMPLETE */
10795         struct mbuf *o_pak;
10796         struct mbuf *mout;
10797         struct ip *iph;
10798         struct udphdr *udp = NULL;
10799         int offset_out, len, mlen;
10800         struct sctp_shutdown_complete_msg *comp_cp;
10801
10802 #ifdef INET
10803         struct ip *iph_out;
10804
10805 #endif
10806 #ifdef INET6
10807         struct ip6_hdr *ip6, *ip6_out;
10808
10809 #endif
10810
10811         iph = mtod(m, struct ip *);
10812         switch (iph->ip_v) {
10813 #ifdef INET
10814         case IPVERSION:
10815                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10816                 break;
10817 #endif
10818 #ifdef INET6
10819         case IPV6_VERSION >> 4:
10820                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10821                 break;
10822 #endif
10823         default:
10824                 return;
10825         }
10826         if (port) {
10827                 len += sizeof(struct udphdr);
10828         }
10829         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10830         if (mout == NULL) {
10831                 return;
10832         }
10833         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10834         SCTP_BUF_LEN(mout) = len;
10835         SCTP_BUF_NEXT(mout) = NULL;
10836         if (m->m_flags & M_FLOWID) {
10837                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
10838                 mout->m_flags |= M_FLOWID;
10839         }
10840 #ifdef INET
10841         iph_out = NULL;
10842 #endif
10843 #ifdef INET6
10844         ip6_out = NULL;
10845 #endif
10846         offset_out = 0;
10847
10848         switch (iph->ip_v) {
10849 #ifdef INET
10850         case IPVERSION:
10851                 iph_out = mtod(mout, struct ip *);
10852
10853                 /* Fill in the IP header for the ABORT */
10854                 iph_out->ip_v = IPVERSION;
10855                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10856                 iph_out->ip_tos = (u_char)0;
10857                 iph_out->ip_id = 0;
10858                 iph_out->ip_off = 0;
10859                 iph_out->ip_ttl = MAXTTL;
10860                 if (port) {
10861                         iph_out->ip_p = IPPROTO_UDP;
10862                 } else {
10863                         iph_out->ip_p = IPPROTO_SCTP;
10864                 }
10865                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10866                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10867
10868                 /* let IP layer calculate this */
10869                 iph_out->ip_sum = 0;
10870                 offset_out += sizeof(*iph_out);
10871                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10872                     (caddr_t)iph_out + offset_out);
10873                 break;
10874 #endif
10875 #ifdef INET6
10876         case IPV6_VERSION >> 4:
10877                 ip6 = (struct ip6_hdr *)iph;
10878                 ip6_out = mtod(mout, struct ip6_hdr *);
10879
10880                 /* Fill in the IPv6 header for the ABORT */
10881                 ip6_out->ip6_flow = ip6->ip6_flow;
10882                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10883                 if (port) {
10884                         ip6_out->ip6_nxt = IPPROTO_UDP;
10885                 } else {
10886                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10887                 }
10888                 ip6_out->ip6_src = ip6->ip6_dst;
10889                 ip6_out->ip6_dst = ip6->ip6_src;
10890                 /*
10891                  * ?? The old code had both the iph len + payload, I think
10892                  * this is wrong and would never have worked
10893                  */
10894                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10895                 offset_out += sizeof(*ip6_out);
10896                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10897                     (caddr_t)ip6_out + offset_out);
10898                 break;
10899 #endif                          /* INET6 */
10900         default:
10901                 /* Currently not supported. */
10902                 sctp_m_freem(mout);
10903                 return;
10904         }
10905         if (port) {
10906                 udp = (struct udphdr *)comp_cp;
10907                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10908                 udp->uh_dport = port;
10909                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10910 #ifdef INET
10911                 if (iph_out)
10912                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10913 #endif
10914                 offset_out += sizeof(struct udphdr);
10915                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10916         }
10917         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10918                 /* no mbuf's */
10919                 sctp_m_freem(mout);
10920                 return;
10921         }
10922         /* Now copy in and fill in the ABORT tags etc. */
10923         comp_cp->sh.src_port = sh->dest_port;
10924         comp_cp->sh.dest_port = sh->src_port;
10925         comp_cp->sh.checksum = 0;
10926         comp_cp->sh.v_tag = sh->v_tag;
10927         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10928         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10929         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10930
10931 #ifdef INET
10932         if (iph_out != NULL) {
10933                 sctp_route_t ro;
10934                 int ret;
10935
10936                 mlen = SCTP_BUF_LEN(mout);
10937                 bzero(&ro, sizeof ro);
10938                 /* set IPv4 length */
10939                 iph_out->ip_len = mlen;
10940 #ifdef  SCTP_PACKET_LOGGING
10941                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10942                         sctp_packet_log(mout, mlen);
10943 #endif
10944                 if (port) {
10945 #if defined(SCTP_WITH_NO_CSUM)
10946                         SCTP_STAT_INCR(sctps_sendnocrc);
10947 #else
10948                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10949                         SCTP_STAT_INCR(sctps_sendswcrc);
10950 #endif
10951                         SCTP_ENABLE_UDP_CSUM(mout);
10952                 } else {
10953 #if defined(SCTP_WITH_NO_CSUM)
10954                         SCTP_STAT_INCR(sctps_sendnocrc);
10955 #else
10956                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10957                         mout->m_pkthdr.csum_data = 0;
10958                         SCTP_STAT_INCR(sctps_sendhwcrc);
10959 #endif
10960                 }
10961                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10962                 /* out it goes */
10963                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
10964
10965                 /* Free the route if we got one back */
10966                 if (ro.ro_rt)
10967                         RTFREE(ro.ro_rt);
10968         }
10969 #endif
10970 #ifdef INET6
10971         if (ip6_out != NULL) {
10972                 struct route_in6 ro;
10973                 int ret;
10974                 struct ifnet *ifp = NULL;
10975
10976                 bzero(&ro, sizeof(ro));
10977                 mlen = SCTP_BUF_LEN(mout);
10978 #ifdef  SCTP_PACKET_LOGGING
10979                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10980                         sctp_packet_log(mout, mlen);
10981 #endif
10982                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10983                 if (port) {
10984 #if defined(SCTP_WITH_NO_CSUM)
10985                         SCTP_STAT_INCR(sctps_sendnocrc);
10986 #else
10987                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
10988                         SCTP_STAT_INCR(sctps_sendswcrc);
10989 #endif
10990                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
10991                                 udp->uh_sum = 0xffff;
10992                         }
10993                 } else {
10994 #if defined(SCTP_WITH_NO_CSUM)
10995                         SCTP_STAT_INCR(sctps_sendnocrc);
10996 #else
10997                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10998                         mout->m_pkthdr.csum_data = 0;
10999                         SCTP_STAT_INCR(sctps_sendhwcrc);
11000 #endif
11001                 }
11002                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11003
11004                 /* Free the route if we got one back */
11005                 if (ro.ro_rt)
11006                         RTFREE(ro.ro_rt);
11007         }
11008 #endif
11009         SCTP_STAT_INCR(sctps_sendpackets);
11010         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11011         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11012         return;
11013
11014 }
11015
11016 void
11017 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11018 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11019     SCTP_UNUSED
11020 #endif
11021 )
11022 {
11023         struct sctp_tmit_chunk *chk;
11024         struct sctp_heartbeat_chunk *hb;
11025         struct timeval now;
11026
11027         SCTP_TCB_LOCK_ASSERT(stcb);
11028         if (net == NULL) {
11029                 return;
11030         }
11031         (void)SCTP_GETTIME_TIMEVAL(&now);
11032         switch (net->ro._l_addr.sa.sa_family) {
11033 #ifdef INET
11034         case AF_INET:
11035                 break;
11036 #endif
11037 #ifdef INET6
11038         case AF_INET6:
11039                 break;
11040 #endif
11041         default:
11042                 return;
11043         }
11044         sctp_alloc_a_chunk(stcb, chk);
11045         if (chk == NULL) {
11046                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11047                 return;
11048         }
11049         chk->copy_by_ref = 0;
11050         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11051         chk->rec.chunk_id.can_take_data = 1;
11052         chk->asoc = &stcb->asoc;
11053         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11054
11055         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11056         if (chk->data == NULL) {
11057                 sctp_free_a_chunk(stcb, chk, so_locked);
11058                 return;
11059         }
11060         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11061         SCTP_BUF_LEN(chk->data) = chk->send_size;
11062         chk->sent = SCTP_DATAGRAM_UNSENT;
11063         chk->snd_count = 0;
11064         chk->whoTo = net;
11065         atomic_add_int(&chk->whoTo->ref_count, 1);
11066         /* Now we have a mbuf that we can fill in with the details */
11067         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11068         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11069         /* fill out chunk header */
11070         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11071         hb->ch.chunk_flags = 0;
11072         hb->ch.chunk_length = htons(chk->send_size);
11073         /* Fill out hb parameter */
11074         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11075         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11076         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11077         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11078         /* Did our user request this one, put it in */
11079         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11080         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11081         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11082                 /*
11083                  * we only take from the entropy pool if the address is not
11084                  * confirmed.
11085                  */
11086                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11087                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11088         } else {
11089                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11090                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11091         }
11092         switch (net->ro._l_addr.sa.sa_family) {
11093 #ifdef INET
11094         case AF_INET:
11095                 memcpy(hb->heartbeat.hb_info.address,
11096                     &net->ro._l_addr.sin.sin_addr,
11097                     sizeof(net->ro._l_addr.sin.sin_addr));
11098                 break;
11099 #endif
11100 #ifdef INET6
11101         case AF_INET6:
11102                 memcpy(hb->heartbeat.hb_info.address,
11103                     &net->ro._l_addr.sin6.sin6_addr,
11104                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11105                 break;
11106 #endif
11107         default:
11108                 return;
11109                 break;
11110         }
11111         net->hb_responded = 0;
11112         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11113         stcb->asoc.ctrl_queue_cnt++;
11114         SCTP_STAT_INCR(sctps_sendheartbeat);
11115         return;
11116 }
11117
11118 void
11119 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11120     uint32_t high_tsn)
11121 {
11122         struct sctp_association *asoc;
11123         struct sctp_ecne_chunk *ecne;
11124         struct sctp_tmit_chunk *chk;
11125
11126         if (net == NULL) {
11127                 return;
11128         }
11129         asoc = &stcb->asoc;
11130         SCTP_TCB_LOCK_ASSERT(stcb);
11131         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11132                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11133                         /* found a previous ECN_ECHO update it if needed */
11134                         uint32_t cnt, ctsn;
11135
11136                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11137                         ctsn = ntohl(ecne->tsn);
11138                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11139                                 ecne->tsn = htonl(high_tsn);
11140                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11141                         }
11142                         cnt = ntohl(ecne->num_pkts_since_cwr);
11143                         cnt++;
11144                         ecne->num_pkts_since_cwr = htonl(cnt);
11145                         return;
11146                 }
11147         }
11148         /* nope could not find one to update so we must build one */
11149         sctp_alloc_a_chunk(stcb, chk);
11150         if (chk == NULL) {
11151                 return;
11152         }
11153         chk->copy_by_ref = 0;
11154         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11155         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11156         chk->rec.chunk_id.can_take_data = 0;
11157         chk->asoc = &stcb->asoc;
11158         chk->send_size = sizeof(struct sctp_ecne_chunk);
11159         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11160         if (chk->data == NULL) {
11161                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11162                 return;
11163         }
11164         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11165         SCTP_BUF_LEN(chk->data) = chk->send_size;
11166         chk->sent = SCTP_DATAGRAM_UNSENT;
11167         chk->snd_count = 0;
11168         chk->whoTo = net;
11169         atomic_add_int(&chk->whoTo->ref_count, 1);
11170
11171         stcb->asoc.ecn_echo_cnt_onq++;
11172         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11173         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11174         ecne->ch.chunk_flags = 0;
11175         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11176         ecne->tsn = htonl(high_tsn);
11177         ecne->num_pkts_since_cwr = htonl(1);
11178         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11179         asoc->ctrl_queue_cnt++;
11180 }
11181
11182 void
11183 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11184     struct mbuf *m, int iphlen, int bad_crc)
11185 {
11186         struct sctp_association *asoc;
11187         struct sctp_pktdrop_chunk *drp;
11188         struct sctp_tmit_chunk *chk;
11189         uint8_t *datap;
11190         int len;
11191         int was_trunc = 0;
11192         struct ip *iph;
11193
11194 #ifdef INET6
11195         struct ip6_hdr *ip6h;
11196
11197 #endif
11198         int fullsz = 0, extra = 0;
11199         long spc;
11200         int offset;
11201         struct sctp_chunkhdr *ch, chunk_buf;
11202         unsigned int chk_length;
11203
11204         if (!stcb) {
11205                 return;
11206         }
11207         asoc = &stcb->asoc;
11208         SCTP_TCB_LOCK_ASSERT(stcb);
11209         if (asoc->peer_supports_pktdrop == 0) {
11210                 /*-
11211                  * peer must declare support before I send one.
11212                  */
11213                 return;
11214         }
11215         if (stcb->sctp_socket == NULL) {
11216                 return;
11217         }
11218         sctp_alloc_a_chunk(stcb, chk);
11219         if (chk == NULL) {
11220                 return;
11221         }
11222         chk->copy_by_ref = 0;
11223         iph = mtod(m, struct ip *);
11224         if (iph == NULL) {
11225                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11226                 return;
11227         }
11228         switch (iph->ip_v) {
11229 #ifdef INET
11230         case IPVERSION:
11231                 /* IPv4 */
11232                 len = chk->send_size = iph->ip_len;
11233                 break;
11234 #endif
11235 #ifdef INET6
11236         case IPV6_VERSION >> 4:
11237                 /* IPv6 */
11238                 ip6h = mtod(m, struct ip6_hdr *);
11239                 len = chk->send_size = htons(ip6h->ip6_plen);
11240                 break;
11241 #endif
11242         default:
11243                 return;
11244         }
11245         /* Validate that we do not have an ABORT in here. */
11246         offset = iphlen + sizeof(struct sctphdr);
11247         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11248             sizeof(*ch), (uint8_t *) & chunk_buf);
11249         while (ch != NULL) {
11250                 chk_length = ntohs(ch->chunk_length);
11251                 if (chk_length < sizeof(*ch)) {
11252                         /* break to abort land */
11253                         break;
11254                 }
11255                 switch (ch->chunk_type) {
11256                 case SCTP_PACKET_DROPPED:
11257                 case SCTP_ABORT_ASSOCIATION:
11258                 case SCTP_INITIATION_ACK:
11259                         /**
11260                          * We don't respond with an PKT-DROP to an ABORT
11261                          * or PKT-DROP. We also do not respond to an
11262                          * INIT-ACK, because we can't know if the initiation
11263                          * tag is correct or not.
11264                          */
11265                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11266                         return;
11267                 default:
11268                         break;
11269                 }
11270                 offset += SCTP_SIZE32(chk_length);
11271                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11272                     sizeof(*ch), (uint8_t *) & chunk_buf);
11273         }
11274
11275         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11276             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11277                 /*
11278                  * only send 1 mtu worth, trim off the excess on the end.
11279                  */
11280                 fullsz = len - extra;
11281                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11282                 was_trunc = 1;
11283         }
11284         chk->asoc = &stcb->asoc;
11285         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11286         if (chk->data == NULL) {
11287 jump_out:
11288                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11289                 return;
11290         }
11291         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11292         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11293         if (drp == NULL) {
11294                 sctp_m_freem(chk->data);
11295                 chk->data = NULL;
11296                 goto jump_out;
11297         }
11298         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11299             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11300         chk->book_size_scale = 0;
11301         if (was_trunc) {
11302                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11303                 drp->trunc_len = htons(fullsz);
11304                 /*
11305                  * Len is already adjusted to size minus overhead above take
11306                  * out the pkt_drop chunk itself from it.
11307                  */
11308                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11309                 len = chk->send_size;
11310         } else {
11311                 /* no truncation needed */
11312                 drp->ch.chunk_flags = 0;
11313                 drp->trunc_len = htons(0);
11314         }
11315         if (bad_crc) {
11316                 drp->ch.chunk_flags |= SCTP_BADCRC;
11317         }
11318         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11319         SCTP_BUF_LEN(chk->data) = chk->send_size;
11320         chk->sent = SCTP_DATAGRAM_UNSENT;
11321         chk->snd_count = 0;
11322         if (net) {
11323                 /* we should hit here */
11324                 chk->whoTo = net;
11325                 atomic_add_int(&chk->whoTo->ref_count, 1);
11326         } else {
11327                 chk->whoTo = NULL;
11328         }
11329         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11330         chk->rec.chunk_id.can_take_data = 1;
11331         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11332         drp->ch.chunk_length = htons(chk->send_size);
11333         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11334         if (spc < 0) {
11335                 spc = 0;
11336         }
11337         drp->bottle_bw = htonl(spc);
11338         if (asoc->my_rwnd) {
11339                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11340                     asoc->size_on_all_streams +
11341                     asoc->my_rwnd_control_len +
11342                     stcb->sctp_socket->so_rcv.sb_cc);
11343         } else {
11344                 /*-
11345                  * If my rwnd is 0, possibly from mbuf depletion as well as
11346                  * space used, tell the peer there is NO space aka onq == bw
11347                  */
11348                 drp->current_onq = htonl(spc);
11349         }
11350         drp->reserved = 0;
11351         datap = drp->data;
11352         m_copydata(m, iphlen, len, (caddr_t)datap);
11353         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11354         asoc->ctrl_queue_cnt++;
11355 }
11356
11357 void
11358 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11359 {
11360         struct sctp_association *asoc;
11361         struct sctp_cwr_chunk *cwr;
11362         struct sctp_tmit_chunk *chk;
11363
11364         asoc = &stcb->asoc;
11365         SCTP_TCB_LOCK_ASSERT(stcb);
11366         if (net == NULL) {
11367                 return;
11368         }
11369         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11370                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11371                         /*
11372                          * found a previous CWR queued to same destination
11373                          * update it if needed
11374                          */
11375                         uint32_t ctsn;
11376
11377                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11378                         ctsn = ntohl(cwr->tsn);
11379                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11380                                 cwr->tsn = htonl(high_tsn);
11381                         }
11382                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11383                                 /* Make sure override is carried */
11384                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11385                         }
11386                         return;
11387                 }
11388         }
11389         sctp_alloc_a_chunk(stcb, chk);
11390         if (chk == NULL) {
11391                 return;
11392         }
11393         chk->copy_by_ref = 0;
11394         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11395         chk->rec.chunk_id.can_take_data = 1;
11396         chk->asoc = &stcb->asoc;
11397         chk->send_size = sizeof(struct sctp_cwr_chunk);
11398         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11399         if (chk->data == NULL) {
11400                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11401                 return;
11402         }
11403         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11404         SCTP_BUF_LEN(chk->data) = chk->send_size;
11405         chk->sent = SCTP_DATAGRAM_UNSENT;
11406         chk->snd_count = 0;
11407         chk->whoTo = net;
11408         atomic_add_int(&chk->whoTo->ref_count, 1);
11409         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11410         cwr->ch.chunk_type = SCTP_ECN_CWR;
11411         cwr->ch.chunk_flags = override;
11412         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11413         cwr->tsn = htonl(high_tsn);
11414         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11415         asoc->ctrl_queue_cnt++;
11416 }
11417
11418 void
11419 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11420     int number_entries, uint16_t * list,
11421     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11422 {
11423         int len, old_len, i;
11424         struct sctp_stream_reset_out_request *req_out;
11425         struct sctp_chunkhdr *ch;
11426
11427         ch = mtod(chk->data, struct sctp_chunkhdr *);
11428
11429
11430         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11431
11432         /* get to new offset for the param. */
11433         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11434         /* now how long will this param be? */
11435         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11436         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11437         req_out->ph.param_length = htons(len);
11438         req_out->request_seq = htonl(seq);
11439         req_out->response_seq = htonl(resp_seq);
11440         req_out->send_reset_at_tsn = htonl(last_sent);
11441         if (number_entries) {
11442                 for (i = 0; i < number_entries; i++) {
11443                         req_out->list_of_streams[i] = htons(list[i]);
11444                 }
11445         }
11446         if (SCTP_SIZE32(len) > len) {
11447                 /*-
11448                  * Need to worry about the pad we may end up adding to the
11449                  * end. This is easy since the struct is either aligned to 4
11450                  * bytes or 2 bytes off.
11451                  */
11452                 req_out->list_of_streams[number_entries] = 0;
11453         }
11454         /* now fix the chunk length */
11455         ch->chunk_length = htons(len + old_len);
11456         chk->book_size = len + old_len;
11457         chk->book_size_scale = 0;
11458         chk->send_size = SCTP_SIZE32(chk->book_size);
11459         SCTP_BUF_LEN(chk->data) = chk->send_size;
11460         return;
11461 }
11462
11463
11464 void
11465 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11466     int number_entries, uint16_t * list,
11467     uint32_t seq)
11468 {
11469         int len, old_len, i;
11470         struct sctp_stream_reset_in_request *req_in;
11471         struct sctp_chunkhdr *ch;
11472
11473         ch = mtod(chk->data, struct sctp_chunkhdr *);
11474
11475
11476         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11477
11478         /* get to new offset for the param. */
11479         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11480         /* now how long will this param be? */
11481         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11482         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11483         req_in->ph.param_length = htons(len);
11484         req_in->request_seq = htonl(seq);
11485         if (number_entries) {
11486                 for (i = 0; i < number_entries; i++) {
11487                         req_in->list_of_streams[i] = htons(list[i]);
11488                 }
11489         }
11490         if (SCTP_SIZE32(len) > len) {
11491                 /*-
11492                  * Need to worry about the pad we may end up adding to the
11493                  * end. This is easy since the struct is either aligned to 4
11494                  * bytes or 2 bytes off.
11495                  */
11496                 req_in->list_of_streams[number_entries] = 0;
11497         }
11498         /* now fix the chunk length */
11499         ch->chunk_length = htons(len + old_len);
11500         chk->book_size = len + old_len;
11501         chk->book_size_scale = 0;
11502         chk->send_size = SCTP_SIZE32(chk->book_size);
11503         SCTP_BUF_LEN(chk->data) = chk->send_size;
11504         return;
11505 }
11506
11507
11508 void
11509 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11510     uint32_t seq)
11511 {
11512         int len, old_len;
11513         struct sctp_stream_reset_tsn_request *req_tsn;
11514         struct sctp_chunkhdr *ch;
11515
11516         ch = mtod(chk->data, struct sctp_chunkhdr *);
11517
11518
11519         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11520
11521         /* get to new offset for the param. */
11522         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11523         /* now how long will this param be? */
11524         len = sizeof(struct sctp_stream_reset_tsn_request);
11525         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11526         req_tsn->ph.param_length = htons(len);
11527         req_tsn->request_seq = htonl(seq);
11528
11529         /* now fix the chunk length */
11530         ch->chunk_length = htons(len + old_len);
11531         chk->send_size = len + old_len;
11532         chk->book_size = SCTP_SIZE32(chk->send_size);
11533         chk->book_size_scale = 0;
11534         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11535         return;
11536 }
11537
11538 void
11539 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11540     uint32_t resp_seq, uint32_t result)
11541 {
11542         int len, old_len;
11543         struct sctp_stream_reset_response *resp;
11544         struct sctp_chunkhdr *ch;
11545
11546         ch = mtod(chk->data, struct sctp_chunkhdr *);
11547
11548
11549         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11550
11551         /* get to new offset for the param. */
11552         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11553         /* now how long will this param be? */
11554         len = sizeof(struct sctp_stream_reset_response);
11555         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11556         resp->ph.param_length = htons(len);
11557         resp->response_seq = htonl(resp_seq);
11558         resp->result = ntohl(result);
11559
11560         /* now fix the chunk length */
11561         ch->chunk_length = htons(len + old_len);
11562         chk->book_size = len + old_len;
11563         chk->book_size_scale = 0;
11564         chk->send_size = SCTP_SIZE32(chk->book_size);
11565         SCTP_BUF_LEN(chk->data) = chk->send_size;
11566         return;
11567
11568 }
11569
11570
11571 void
11572 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11573     uint32_t resp_seq, uint32_t result,
11574     uint32_t send_una, uint32_t recv_next)
11575 {
11576         int len, old_len;
11577         struct sctp_stream_reset_response_tsn *resp;
11578         struct sctp_chunkhdr *ch;
11579
11580         ch = mtod(chk->data, struct sctp_chunkhdr *);
11581
11582
11583         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11584
11585         /* get to new offset for the param. */
11586         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11587         /* now how long will this param be? */
11588         len = sizeof(struct sctp_stream_reset_response_tsn);
11589         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11590         resp->ph.param_length = htons(len);
11591         resp->response_seq = htonl(resp_seq);
11592         resp->result = htonl(result);
11593         resp->senders_next_tsn = htonl(send_una);
11594         resp->receivers_next_tsn = htonl(recv_next);
11595
11596         /* now fix the chunk length */
11597         ch->chunk_length = htons(len + old_len);
11598         chk->book_size = len + old_len;
11599         chk->send_size = SCTP_SIZE32(chk->book_size);
11600         chk->book_size_scale = 0;
11601         SCTP_BUF_LEN(chk->data) = chk->send_size;
11602         return;
11603 }
11604
11605 static void
11606 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11607     uint32_t seq,
11608     uint16_t adding)
11609 {
11610         int len, old_len;
11611         struct sctp_chunkhdr *ch;
11612         struct sctp_stream_reset_add_strm *addstr;
11613
11614         ch = mtod(chk->data, struct sctp_chunkhdr *);
11615         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11616
11617         /* get to new offset for the param. */
11618         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11619         /* now how long will this param be? */
11620         len = sizeof(struct sctp_stream_reset_add_strm);
11621
11622         /* Fill it out. */
11623         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11624         addstr->ph.param_length = htons(len);
11625         addstr->request_seq = htonl(seq);
11626         addstr->number_of_streams = htons(adding);
11627         addstr->reserved = 0;
11628
11629         /* now fix the chunk length */
11630         ch->chunk_length = htons(len + old_len);
11631         chk->send_size = len + old_len;
11632         chk->book_size = SCTP_SIZE32(chk->send_size);
11633         chk->book_size_scale = 0;
11634         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11635         return;
11636 }
11637
11638 int
11639 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11640     int number_entries, uint16_t * list,
11641     uint8_t send_out_req,
11642     uint32_t resp_seq,
11643     uint8_t send_in_req,
11644     uint8_t send_tsn_req,
11645     uint8_t add_stream,
11646     uint16_t adding
11647 )
11648 {
11649
11650         struct sctp_association *asoc;
11651         struct sctp_tmit_chunk *chk;
11652         struct sctp_chunkhdr *ch;
11653         uint32_t seq;
11654
11655         asoc = &stcb->asoc;
11656         if (asoc->stream_reset_outstanding) {
11657                 /*-
11658                  * Already one pending, must get ACK back to clear the flag.
11659                  */
11660                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11661                 return (EBUSY);
11662         }
11663         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11664             (add_stream == 0)) {
11665                 /* nothing to do */
11666                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11667                 return (EINVAL);
11668         }
11669         if (send_tsn_req && (send_out_req || send_in_req)) {
11670                 /* error, can't do that */
11671                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11672                 return (EINVAL);
11673         }
11674         sctp_alloc_a_chunk(stcb, chk);
11675         if (chk == NULL) {
11676                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11677                 return (ENOMEM);
11678         }
11679         chk->copy_by_ref = 0;
11680         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11681         chk->rec.chunk_id.can_take_data = 0;
11682         chk->asoc = &stcb->asoc;
11683         chk->book_size = sizeof(struct sctp_chunkhdr);
11684         chk->send_size = SCTP_SIZE32(chk->book_size);
11685         chk->book_size_scale = 0;
11686
11687         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11688         if (chk->data == NULL) {
11689                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11690                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11691                 return (ENOMEM);
11692         }
11693         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11694
11695         /* setup chunk parameters */
11696         chk->sent = SCTP_DATAGRAM_UNSENT;
11697         chk->snd_count = 0;
11698         if (stcb->asoc.alternate) {
11699                 chk->whoTo = stcb->asoc.alternate;
11700         } else {
11701                 chk->whoTo = stcb->asoc.primary_destination;
11702         }
11703         atomic_add_int(&chk->whoTo->ref_count, 1);
11704         ch = mtod(chk->data, struct sctp_chunkhdr *);
11705         ch->chunk_type = SCTP_STREAM_RESET;
11706         ch->chunk_flags = 0;
11707         ch->chunk_length = htons(chk->book_size);
11708         SCTP_BUF_LEN(chk->data) = chk->send_size;
11709
11710         seq = stcb->asoc.str_reset_seq_out;
11711         if (send_out_req) {
11712                 sctp_add_stream_reset_out(chk, number_entries, list,
11713                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11714                 asoc->stream_reset_out_is_outstanding = 1;
11715                 seq++;
11716                 asoc->stream_reset_outstanding++;
11717         }
11718         if (add_stream) {
11719                 sctp_add_a_stream(chk, seq, adding);
11720                 seq++;
11721                 asoc->stream_reset_outstanding++;
11722         }
11723         if (send_in_req) {
11724                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11725                 asoc->stream_reset_outstanding++;
11726         }
11727         if (send_tsn_req) {
11728                 sctp_add_stream_reset_tsn(chk, seq);
11729                 asoc->stream_reset_outstanding++;
11730         }
11731         asoc->str_reset = chk;
11732
11733         /* insert the chunk for sending */
11734         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11735             chk,
11736             sctp_next);
11737         asoc->ctrl_queue_cnt++;
11738         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11739         return (0);
11740 }
11741
11742 void
11743 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11744     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11745 {
11746         /*-
11747          * Formulate the abort message, and send it back down.
11748          */
11749         struct mbuf *o_pak;
11750         struct mbuf *mout;
11751         struct sctp_abort_msg *abm;
11752         struct ip *iph;
11753         struct udphdr *udp;
11754         int iphlen_out, len;
11755
11756 #ifdef INET
11757         struct ip *iph_out;
11758
11759 #endif
11760 #ifdef INET6
11761         struct ip6_hdr *ip6, *ip6_out;
11762
11763 #endif
11764
11765         /* don't respond to ABORT with ABORT */
11766         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11767                 if (err_cause)
11768                         sctp_m_freem(err_cause);
11769                 return;
11770         }
11771         iph = mtod(m, struct ip *);
11772         switch (iph->ip_v) {
11773 #ifdef INET
11774         case IPVERSION:
11775                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11776                 break;
11777 #endif
11778 #ifdef INET6
11779         case IPV6_VERSION >> 4:
11780                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11781                 break;
11782 #endif
11783         default:
11784                 if (err_cause) {
11785                         sctp_m_freem(err_cause);
11786                 }
11787                 return;
11788         }
11789         if (port) {
11790                 len += sizeof(struct udphdr);
11791         }
11792         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11793         if (mout == NULL) {
11794                 if (err_cause) {
11795                         sctp_m_freem(err_cause);
11796                 }
11797                 return;
11798         }
11799         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11800         SCTP_BUF_LEN(mout) = len;
11801         SCTP_BUF_NEXT(mout) = err_cause;
11802         if (m->m_flags & M_FLOWID) {
11803                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11804                 mout->m_flags |= M_FLOWID;
11805         }
11806 #ifdef INET
11807         iph_out = NULL;
11808 #endif
11809 #ifdef INET6
11810         ip6_out = NULL;
11811 #endif
11812         switch (iph->ip_v) {
11813 #ifdef INET
11814         case IPVERSION:
11815                 iph_out = mtod(mout, struct ip *);
11816
11817                 /* Fill in the IP header for the ABORT */
11818                 iph_out->ip_v = IPVERSION;
11819                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11820                 iph_out->ip_tos = (u_char)0;
11821                 iph_out->ip_id = 0;
11822                 iph_out->ip_off = 0;
11823                 iph_out->ip_ttl = MAXTTL;
11824                 if (port) {
11825                         iph_out->ip_p = IPPROTO_UDP;
11826                 } else {
11827                         iph_out->ip_p = IPPROTO_SCTP;
11828                 }
11829                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11830                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11831                 /* let IP layer calculate this */
11832                 iph_out->ip_sum = 0;
11833
11834                 iphlen_out = sizeof(*iph_out);
11835                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11836                 break;
11837 #endif
11838 #ifdef INET6
11839         case IPV6_VERSION >> 4:
11840                 ip6 = (struct ip6_hdr *)iph;
11841                 ip6_out = mtod(mout, struct ip6_hdr *);
11842
11843                 /* Fill in the IP6 header for the ABORT */
11844                 ip6_out->ip6_flow = ip6->ip6_flow;
11845                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11846                 if (port) {
11847                         ip6_out->ip6_nxt = IPPROTO_UDP;
11848                 } else {
11849                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11850                 }
11851                 ip6_out->ip6_src = ip6->ip6_dst;
11852                 ip6_out->ip6_dst = ip6->ip6_src;
11853
11854                 iphlen_out = sizeof(*ip6_out);
11855                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11856                 break;
11857 #endif                          /* INET6 */
11858         default:
11859                 /* Currently not supported */
11860                 sctp_m_freem(mout);
11861                 return;
11862         }
11863
11864         udp = (struct udphdr *)abm;
11865         if (port) {
11866                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11867                 udp->uh_dport = port;
11868                 /* set udp->uh_ulen later */
11869                 udp->uh_sum = 0;
11870                 iphlen_out += sizeof(struct udphdr);
11871                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11872         }
11873         abm->sh.src_port = sh->dest_port;
11874         abm->sh.dest_port = sh->src_port;
11875         abm->sh.checksum = 0;
11876         if (vtag == 0) {
11877                 abm->sh.v_tag = sh->v_tag;
11878                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11879         } else {
11880                 abm->sh.v_tag = htonl(vtag);
11881                 abm->msg.ch.chunk_flags = 0;
11882         }
11883         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11884
11885         if (err_cause) {
11886                 struct mbuf *m_tmp = err_cause;
11887                 int err_len = 0;
11888
11889                 /* get length of the err_cause chain */
11890                 while (m_tmp != NULL) {
11891                         err_len += SCTP_BUF_LEN(m_tmp);
11892                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11893                 }
11894                 len = SCTP_BUF_LEN(mout) + err_len;
11895                 if (err_len % 4) {
11896                         /* need pad at end of chunk */
11897                         uint32_t cpthis = 0;
11898                         int padlen;
11899
11900                         padlen = 4 - (len % 4);
11901                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11902                         len += padlen;
11903                 }
11904                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11905         } else {
11906                 len = SCTP_BUF_LEN(mout);
11907                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11908         }
11909
11910         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11911                 /* no mbuf's */
11912                 sctp_m_freem(mout);
11913                 return;
11914         }
11915 #ifdef INET
11916         if (iph_out != NULL) {
11917                 sctp_route_t ro;
11918                 int ret;
11919
11920                 /* zap the stack pointer to the route */
11921                 bzero(&ro, sizeof ro);
11922                 if (port) {
11923                         udp->uh_ulen = htons(len - sizeof(struct ip));
11924                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11925                 }
11926                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11927                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11928                 /* set IPv4 length */
11929                 iph_out->ip_len = len;
11930                 /* out it goes */
11931 #ifdef  SCTP_PACKET_LOGGING
11932                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11933                         sctp_packet_log(mout, len);
11934 #endif
11935                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11936                 if (port) {
11937 #if defined(SCTP_WITH_NO_CSUM)
11938                         SCTP_STAT_INCR(sctps_sendnocrc);
11939 #else
11940                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11941                         SCTP_STAT_INCR(sctps_sendswcrc);
11942 #endif
11943                         SCTP_ENABLE_UDP_CSUM(o_pak);
11944                 } else {
11945 #if defined(SCTP_WITH_NO_CSUM)
11946                         SCTP_STAT_INCR(sctps_sendnocrc);
11947 #else
11948                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11949                         mout->m_pkthdr.csum_data = 0;
11950                         SCTP_STAT_INCR(sctps_sendhwcrc);
11951 #endif
11952                 }
11953                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11954
11955                 /* Free the route if we got one back */
11956                 if (ro.ro_rt)
11957                         RTFREE(ro.ro_rt);
11958         }
11959 #endif
11960 #ifdef INET6
11961         if (ip6_out != NULL) {
11962                 struct route_in6 ro;
11963                 int ret;
11964                 struct ifnet *ifp = NULL;
11965
11966                 /* zap the stack pointer to the route */
11967                 bzero(&ro, sizeof(ro));
11968                 if (port) {
11969                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11970                 }
11971                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11972                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11973                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11974 #ifdef  SCTP_PACKET_LOGGING
11975                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11976                         sctp_packet_log(mout, len);
11977 #endif
11978                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11979                 if (port) {
11980 #if defined(SCTP_WITH_NO_CSUM)
11981                         SCTP_STAT_INCR(sctps_sendnocrc);
11982 #else
11983                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11984                         SCTP_STAT_INCR(sctps_sendswcrc);
11985 #endif
11986                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11987                                 udp->uh_sum = 0xffff;
11988                         }
11989                 } else {
11990 #if defined(SCTP_WITH_NO_CSUM)
11991                         SCTP_STAT_INCR(sctps_sendnocrc);
11992 #else
11993                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11994                         mout->m_pkthdr.csum_data = 0;
11995                         SCTP_STAT_INCR(sctps_sendhwcrc);
11996 #endif
11997                 }
11998                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11999
12000                 /* Free the route if we got one back */
12001                 if (ro.ro_rt)
12002                         RTFREE(ro.ro_rt);
12003         }
12004 #endif
12005         SCTP_STAT_INCR(sctps_sendpackets);
12006         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12007         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12008 }
12009
12010 void
12011 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
12012     uint32_t vrf_id, uint16_t port)
12013 {
12014         struct mbuf *o_pak;
12015         struct sctphdr *sh, *sh_out;
12016         struct sctp_chunkhdr *ch;
12017         struct ip *iph;
12018         struct udphdr *udp = NULL;
12019         struct mbuf *mout;
12020         int iphlen_out, len;
12021
12022 #ifdef INET
12023         struct ip *iph_out;
12024
12025 #endif
12026 #ifdef INET6
12027         struct ip6_hdr *ip6, *ip6_out;
12028
12029 #endif
12030
12031         iph = mtod(m, struct ip *);
12032         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
12033         switch (iph->ip_v) {
12034 #ifdef INET
12035         case IPVERSION:
12036                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12037                 break;
12038 #endif
12039 #ifdef INET6
12040         case IPV6_VERSION >> 4:
12041                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12042                 break;
12043 #endif
12044         default:
12045                 if (scm) {
12046                         sctp_m_freem(scm);
12047                 }
12048                 return;
12049         }
12050         if (port) {
12051                 len += sizeof(struct udphdr);
12052         }
12053         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
12054         if (mout == NULL) {
12055                 if (scm) {
12056                         sctp_m_freem(scm);
12057                 }
12058                 return;
12059         }
12060         SCTP_BUF_RESV_UF(mout, max_linkhdr);
12061         SCTP_BUF_LEN(mout) = len;
12062         SCTP_BUF_NEXT(mout) = scm;
12063         if (m->m_flags & M_FLOWID) {
12064                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
12065                 mout->m_flags |= M_FLOWID;
12066         }
12067 #ifdef INET
12068         iph_out = NULL;
12069 #endif
12070 #ifdef INET6
12071         ip6_out = NULL;
12072 #endif
12073         switch (iph->ip_v) {
12074 #ifdef INET
12075         case IPVERSION:
12076                 iph_out = mtod(mout, struct ip *);
12077
12078                 /* Fill in the IP header for the ABORT */
12079                 iph_out->ip_v = IPVERSION;
12080                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12081                 iph_out->ip_tos = (u_char)0;
12082                 iph_out->ip_id = 0;
12083                 iph_out->ip_off = 0;
12084                 iph_out->ip_ttl = MAXTTL;
12085                 if (port) {
12086                         iph_out->ip_p = IPPROTO_UDP;
12087                 } else {
12088                         iph_out->ip_p = IPPROTO_SCTP;
12089                 }
12090                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12091                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12092                 /* let IP layer calculate this */
12093                 iph_out->ip_sum = 0;
12094
12095                 iphlen_out = sizeof(struct ip);
12096                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12097                 break;
12098 #endif
12099 #ifdef INET6
12100         case IPV6_VERSION >> 4:
12101                 ip6 = (struct ip6_hdr *)iph;
12102                 ip6_out = mtod(mout, struct ip6_hdr *);
12103
12104                 /* Fill in the IP6 header for the ABORT */
12105                 ip6_out->ip6_flow = ip6->ip6_flow;
12106                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12107                 if (port) {
12108                         ip6_out->ip6_nxt = IPPROTO_UDP;
12109                 } else {
12110                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12111                 }
12112                 ip6_out->ip6_src = ip6->ip6_dst;
12113                 ip6_out->ip6_dst = ip6->ip6_src;
12114
12115                 iphlen_out = sizeof(struct ip6_hdr);
12116                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12117                 break;
12118 #endif                          /* INET6 */
12119         default:
12120                 /* Currently not supported */
12121                 sctp_m_freem(mout);
12122                 return;
12123         }
12124
12125         udp = (struct udphdr *)sh_out;
12126         if (port) {
12127                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12128                 udp->uh_dport = port;
12129                 /* set udp->uh_ulen later */
12130                 udp->uh_sum = 0;
12131                 iphlen_out += sizeof(struct udphdr);
12132                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12133         }
12134         sh_out->src_port = sh->dest_port;
12135         sh_out->dest_port = sh->src_port;
12136         sh_out->v_tag = vtag;
12137         sh_out->checksum = 0;
12138
12139         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12140         ch->chunk_type = SCTP_OPERATION_ERROR;
12141         ch->chunk_flags = 0;
12142
12143         if (scm) {
12144                 struct mbuf *m_tmp = scm;
12145                 int cause_len = 0;
12146
12147                 /* get length of the err_cause chain */
12148                 while (m_tmp != NULL) {
12149                         cause_len += SCTP_BUF_LEN(m_tmp);
12150                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12151                 }
12152                 len = SCTP_BUF_LEN(mout) + cause_len;
12153                 if (cause_len % 4) {
12154                         /* need pad at end of chunk */
12155                         uint32_t cpthis = 0;
12156                         int padlen;
12157
12158                         padlen = 4 - (len % 4);
12159                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12160                         len += padlen;
12161                 }
12162                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12163         } else {
12164                 len = SCTP_BUF_LEN(mout);
12165                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12166         }
12167
12168         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12169                 /* no mbuf's */
12170                 sctp_m_freem(mout);
12171                 return;
12172         }
12173 #ifdef INET
12174         if (iph_out != NULL) {
12175                 sctp_route_t ro;
12176                 int ret;
12177
12178                 /* zap the stack pointer to the route */
12179                 bzero(&ro, sizeof ro);
12180                 if (port) {
12181                         udp->uh_ulen = htons(len - sizeof(struct ip));
12182                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12183                 }
12184                 /* set IPv4 length */
12185                 iph_out->ip_len = len;
12186                 /* out it goes */
12187 #ifdef  SCTP_PACKET_LOGGING
12188                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12189                         sctp_packet_log(mout, len);
12190 #endif
12191                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12192                 if (port) {
12193 #if defined(SCTP_WITH_NO_CSUM)
12194                         SCTP_STAT_INCR(sctps_sendnocrc);
12195 #else
12196                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12197                         SCTP_STAT_INCR(sctps_sendswcrc);
12198 #endif
12199                         SCTP_ENABLE_UDP_CSUM(o_pak);
12200                 } else {
12201 #if defined(SCTP_WITH_NO_CSUM)
12202                         SCTP_STAT_INCR(sctps_sendnocrc);
12203 #else
12204                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12205                         mout->m_pkthdr.csum_data = 0;
12206                         SCTP_STAT_INCR(sctps_sendhwcrc);
12207 #endif
12208                 }
12209                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12210
12211                 /* Free the route if we got one back */
12212                 if (ro.ro_rt)
12213                         RTFREE(ro.ro_rt);
12214         }
12215 #endif
12216 #ifdef INET6
12217         if (ip6_out != NULL) {
12218                 struct route_in6 ro;
12219                 int ret;
12220                 struct ifnet *ifp = NULL;
12221
12222                 /* zap the stack pointer to the route */
12223                 bzero(&ro, sizeof(ro));
12224                 if (port) {
12225                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12226                 }
12227                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12228 #ifdef  SCTP_PACKET_LOGGING
12229                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12230                         sctp_packet_log(mout, len);
12231 #endif
12232                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12233                 if (port) {
12234 #if defined(SCTP_WITH_NO_CSUM)
12235                         SCTP_STAT_INCR(sctps_sendnocrc);
12236 #else
12237                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12238                         SCTP_STAT_INCR(sctps_sendswcrc);
12239 #endif
12240                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12241                                 udp->uh_sum = 0xffff;
12242                         }
12243                 } else {
12244 #if defined(SCTP_WITH_NO_CSUM)
12245                         SCTP_STAT_INCR(sctps_sendnocrc);
12246 #else
12247                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12248                         mout->m_pkthdr.csum_data = 0;
12249                         SCTP_STAT_INCR(sctps_sendhwcrc);
12250 #endif
12251                 }
12252                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12253
12254                 /* Free the route if we got one back */
12255                 if (ro.ro_rt)
12256                         RTFREE(ro.ro_rt);
12257         }
12258 #endif
12259         SCTP_STAT_INCR(sctps_sendpackets);
12260         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12261         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12262 }
12263
12264 static struct mbuf *
12265 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
12266     struct uio *uio,
12267     struct sctp_sndrcvinfo *srcv,
12268     int max_send_len,
12269     int user_marks_eor,
12270     int *error,
12271     uint32_t * sndout,
12272     struct mbuf **new_tail)
12273 {
12274         struct mbuf *m;
12275
12276         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12277             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12278         if (m == NULL) {
12279                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12280                 *error = ENOMEM;
12281         } else {
12282                 *sndout = m_length(m, NULL);
12283                 *new_tail = m_last(m);
12284         }
12285         return (m);
12286 }
12287
12288 static int
12289 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12290     struct uio *uio,
12291     int resv_upfront)
12292 {
12293         int left;
12294
12295         left = sp->length;
12296         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12297             resv_upfront, 0);
12298         if (sp->data == NULL) {
12299                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12300                 return (ENOMEM);
12301         }
12302         sp->tail_mbuf = m_last(sp->data);
12303         return (0);
12304 }
12305
12306
12307
12308 static struct sctp_stream_queue_pending *
12309 sctp_copy_it_in(struct sctp_tcb *stcb,
12310     struct sctp_association *asoc,
12311     struct sctp_sndrcvinfo *srcv,
12312     struct uio *uio,
12313     struct sctp_nets *net,
12314     int max_send_len,
12315     int user_marks_eor,
12316     int *error,
12317     int non_blocking)
12318 {
12319         /*-
12320          * This routine must be very careful in its work. Protocol
12321          * processing is up and running so care must be taken to spl...()
12322          * when you need to do something that may effect the stcb/asoc. The
12323          * sb is locked however. When data is copied the protocol processing
12324          * should be enabled since this is a slower operation...
12325          */
12326         struct sctp_stream_queue_pending *sp = NULL;
12327         int resv_in_first;
12328
12329         *error = 0;
12330         /* Now can we send this? */
12331         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12332             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12333             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12334             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12335                 /* got data while shutting down */
12336                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12337                 *error = ECONNRESET;
12338                 goto out_now;
12339         }
12340         sctp_alloc_a_strmoq(stcb, sp);
12341         if (sp == NULL) {
12342                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12343                 *error = ENOMEM;
12344                 goto out_now;
12345         }
12346         sp->act_flags = 0;
12347         sp->sender_all_done = 0;
12348         sp->sinfo_flags = srcv->sinfo_flags;
12349         sp->timetolive = srcv->sinfo_timetolive;
12350         sp->ppid = srcv->sinfo_ppid;
12351         sp->context = srcv->sinfo_context;
12352         sp->strseq = 0;
12353         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12354
12355         sp->stream = srcv->sinfo_stream;
12356         sp->length = min(uio->uio_resid, max_send_len);
12357         if ((sp->length == (uint32_t) uio->uio_resid) &&
12358             ((user_marks_eor == 0) ||
12359             (srcv->sinfo_flags & SCTP_EOF) ||
12360             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12361                 sp->msg_is_complete = 1;
12362         } else {
12363                 sp->msg_is_complete = 0;
12364         }
12365         sp->sender_all_done = 0;
12366         sp->some_taken = 0;
12367         sp->put_last_out = 0;
12368         resv_in_first = sizeof(struct sctp_data_chunk);
12369         sp->data = sp->tail_mbuf = NULL;
12370         if (sp->length == 0) {
12371                 *error = 0;
12372                 goto skip_copy;
12373         }
12374         if (srcv->sinfo_keynumber_valid) {
12375                 sp->auth_keyid = srcv->sinfo_keynumber;
12376         } else {
12377                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12378         }
12379         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12380                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12381                 sp->holds_key_ref = 1;
12382         }
12383         *error = sctp_copy_one(sp, uio, resv_in_first);
12384 skip_copy:
12385         if (*error) {
12386                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12387                 sp = NULL;
12388         } else {
12389                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12390                         sp->net = net;
12391                         atomic_add_int(&sp->net->ref_count, 1);
12392                 } else {
12393                         sp->net = NULL;
12394                 }
12395                 sctp_set_prsctp_policy(sp);
12396         }
12397 out_now:
12398         return (sp);
12399 }
12400
12401
12402 int
12403 sctp_sosend(struct socket *so,
12404     struct sockaddr *addr,
12405     struct uio *uio,
12406     struct mbuf *top,
12407     struct mbuf *control,
12408     int flags,
12409     struct thread *p
12410 )
12411 {
12412         int error, use_sndinfo = 0;
12413         struct sctp_sndrcvinfo sndrcvninfo;
12414         struct sockaddr *addr_to_use;
12415
12416 #if defined(INET) && defined(INET6)
12417         struct sockaddr_in sin;
12418
12419 #endif
12420
12421         if (control) {
12422                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12423                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12424                     sizeof(sndrcvninfo))) {
12425                         /* got one */
12426                         use_sndinfo = 1;
12427                 }
12428         }
12429         addr_to_use = addr;
12430 #if defined(INET) && defined(INET6)
12431         if ((addr) && (addr->sa_family == AF_INET6)) {
12432                 struct sockaddr_in6 *sin6;
12433
12434                 sin6 = (struct sockaddr_in6 *)addr;
12435                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12436                         in6_sin6_2_sin(&sin, sin6);
12437                         addr_to_use = (struct sockaddr *)&sin;
12438                 }
12439         }
12440 #endif
12441         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12442             control,
12443             flags,
12444             use_sndinfo ? &sndrcvninfo : NULL
12445             ,p
12446             );
12447         return (error);
12448 }
12449
12450
12451 int
12452 sctp_lower_sosend(struct socket *so,
12453     struct sockaddr *addr,
12454     struct uio *uio,
12455     struct mbuf *i_pak,
12456     struct mbuf *control,
12457     int flags,
12458     struct sctp_sndrcvinfo *srcv
12459     ,
12460     struct thread *p
12461 )
12462 {
12463         unsigned int sndlen = 0, max_len;
12464         int error, len;
12465         struct mbuf *top = NULL;
12466         int queue_only = 0, queue_only_for_init = 0;
12467         int free_cnt_applied = 0;
12468         int un_sent;
12469         int now_filled = 0;
12470         unsigned int inqueue_bytes = 0;
12471         struct sctp_block_entry be;
12472         struct sctp_inpcb *inp;
12473         struct sctp_tcb *stcb = NULL;
12474         struct timeval now;
12475         struct sctp_nets *net;
12476         struct sctp_association *asoc;
12477         struct sctp_inpcb *t_inp;
12478         int user_marks_eor;
12479         int create_lock_applied = 0;
12480         int nagle_applies = 0;
12481         int some_on_control = 0;
12482         int got_all_of_the_send = 0;
12483         int hold_tcblock = 0;
12484         int non_blocking = 0;
12485         uint32_t local_add_more, local_soresv = 0;
12486         uint16_t port;
12487         uint16_t sinfo_flags;
12488         sctp_assoc_t sinfo_assoc_id;
12489
12490         error = 0;
12491         net = NULL;
12492         stcb = NULL;
12493         asoc = NULL;
12494
12495         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12496         if (inp == NULL) {
12497                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12498                 error = EINVAL;
12499                 if (i_pak) {
12500                         SCTP_RELEASE_PKT(i_pak);
12501                 }
12502                 return (error);
12503         }
12504         if ((uio == NULL) && (i_pak == NULL)) {
12505                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12506                 return (EINVAL);
12507         }
12508         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12509         atomic_add_int(&inp->total_sends, 1);
12510         if (uio) {
12511                 if (uio->uio_resid < 0) {
12512                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12513                         return (EINVAL);
12514                 }
12515                 sndlen = uio->uio_resid;
12516         } else {
12517                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12518                 sndlen = SCTP_HEADER_LEN(i_pak);
12519         }
12520         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12521             addr,
12522             sndlen);
12523         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12524             (inp->sctp_socket->so_qlimit)) {
12525                 /* The listener can NOT send */
12526                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12527                 error = ENOTCONN;
12528                 goto out_unlocked;
12529         }
12530         /**
12531          * Pre-screen address, if one is given the sin-len
12532          * must be set correctly!
12533          */
12534         if (addr) {
12535                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12536
12537                 switch (raddr->sa.sa_family) {
12538 #if defined(INET)
12539                 case AF_INET:
12540                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12541                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12542                                 error = EINVAL;
12543                                 goto out_unlocked;
12544                         }
12545                         port = raddr->sin.sin_port;
12546                         break;
12547 #endif
12548 #if defined(INET6)
12549                 case AF_INET6:
12550                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12551                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12552                                 error = EINVAL;
12553                                 goto out_unlocked;
12554                         }
12555                         port = raddr->sin6.sin6_port;
12556                         break;
12557 #endif
12558                 default:
12559                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12560                         error = EAFNOSUPPORT;
12561                         goto out_unlocked;
12562                 }
12563         } else
12564                 port = 0;
12565
12566         if (srcv) {
12567                 sinfo_flags = srcv->sinfo_flags;
12568                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12569                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12570                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12571                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12572                         error = EINVAL;
12573                         goto out_unlocked;
12574                 }
12575                 if (srcv->sinfo_flags)
12576                         SCTP_STAT_INCR(sctps_sends_with_flags);
12577         } else {
12578                 sinfo_flags = inp->def_send.sinfo_flags;
12579                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12580         }
12581         if (sinfo_flags & SCTP_SENDALL) {
12582                 /* its a sendall */
12583                 error = sctp_sendall(inp, uio, top, srcv);
12584                 top = NULL;
12585                 goto out_unlocked;
12586         }
12587         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12588                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12589                 error = EINVAL;
12590                 goto out_unlocked;
12591         }
12592         /* now we must find the assoc */
12593         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12594             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12595                 SCTP_INP_RLOCK(inp);
12596                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12597                 if (stcb == NULL) {
12598                         SCTP_INP_RUNLOCK(inp);
12599                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12600                         error = ENOTCONN;
12601                         goto out_unlocked;
12602                 }
12603                 SCTP_TCB_LOCK(stcb);
12604                 hold_tcblock = 1;
12605                 SCTP_INP_RUNLOCK(inp);
12606         } else if (sinfo_assoc_id) {
12607                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12608         } else if (addr) {
12609                 /*-
12610                  * Since we did not use findep we must
12611                  * increment it, and if we don't find a tcb
12612                  * decrement it.
12613                  */
12614                 SCTP_INP_WLOCK(inp);
12615                 SCTP_INP_INCR_REF(inp);
12616                 SCTP_INP_WUNLOCK(inp);
12617                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12618                 if (stcb == NULL) {
12619                         SCTP_INP_WLOCK(inp);
12620                         SCTP_INP_DECR_REF(inp);
12621                         SCTP_INP_WUNLOCK(inp);
12622                 } else {
12623                         hold_tcblock = 1;
12624                 }
12625         }
12626         if ((stcb == NULL) && (addr)) {
12627                 /* Possible implicit send? */
12628                 SCTP_ASOC_CREATE_LOCK(inp);
12629                 create_lock_applied = 1;
12630                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12631                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12632                         /* Should I really unlock ? */
12633                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12634                         error = EINVAL;
12635                         goto out_unlocked;
12636
12637                 }
12638                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12639                     (addr->sa_family == AF_INET6)) {
12640                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12641                         error = EINVAL;
12642                         goto out_unlocked;
12643                 }
12644                 SCTP_INP_WLOCK(inp);
12645                 SCTP_INP_INCR_REF(inp);
12646                 SCTP_INP_WUNLOCK(inp);
12647                 /* With the lock applied look again */
12648                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12649                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12650                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12651                 }
12652                 if (stcb == NULL) {
12653                         SCTP_INP_WLOCK(inp);
12654                         SCTP_INP_DECR_REF(inp);
12655                         SCTP_INP_WUNLOCK(inp);
12656                 } else {
12657                         hold_tcblock = 1;
12658                 }
12659                 if (error) {
12660                         goto out_unlocked;
12661                 }
12662                 if (t_inp != inp) {
12663                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12664                         error = ENOTCONN;
12665                         goto out_unlocked;
12666                 }
12667         }
12668         if (stcb == NULL) {
12669                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12670                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12671                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12672                         error = ENOTCONN;
12673                         goto out_unlocked;
12674                 }
12675                 if (addr == NULL) {
12676                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12677                         error = ENOENT;
12678                         goto out_unlocked;
12679                 } else {
12680                         /*
12681                          * UDP style, we must go ahead and start the INIT
12682                          * process
12683                          */
12684                         uint32_t vrf_id;
12685
12686                         if ((sinfo_flags & SCTP_ABORT) ||
12687                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12688                                 /*-
12689                                  * User asks to abort a non-existant assoc,
12690                                  * or EOF a non-existant assoc with no data
12691                                  */
12692                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12693                                 error = ENOENT;
12694                                 goto out_unlocked;
12695                         }
12696                         /* get an asoc/stcb struct */
12697                         vrf_id = inp->def_vrf_id;
12698 #ifdef INVARIANTS
12699                         if (create_lock_applied == 0) {
12700                                 panic("Error, should hold create lock and I don't?");
12701                         }
12702 #endif
12703                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12704                             p
12705                             );
12706                         if (stcb == NULL) {
12707                                 /* Error is setup for us in the call */
12708                                 goto out_unlocked;
12709                         }
12710                         hold_tcblock = 1;
12711                         if (create_lock_applied) {
12712                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12713                                 create_lock_applied = 0;
12714                         } else {
12715                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12716                         }
12717                         /*
12718                          * Turn on queue only flag to prevent data from
12719                          * being sent
12720                          */
12721                         queue_only = 1;
12722                         asoc = &stcb->asoc;
12723                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12724                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12725
12726                         /* initialize authentication params for the assoc */
12727                         sctp_initialize_auth_params(inp, stcb);
12728
12729                         if (control) {
12730                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12731                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12732                                         hold_tcblock = 0;
12733                                         stcb = NULL;
12734                                         goto out_unlocked;
12735                                 }
12736                         }
12737                         /* out with the INIT */
12738                         queue_only_for_init = 1;
12739                         /*-
12740                          * we may want to dig in after this call and adjust the MTU
12741                          * value. It defaulted to 1500 (constant) but the ro
12742                          * structure may now have an update and thus we may need to
12743                          * change it BEFORE we append the message.
12744                          */
12745                 }
12746         } else
12747                 asoc = &stcb->asoc;
12748         if (srcv == NULL)
12749                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12750         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12751                 if (addr)
12752                         net = sctp_findnet(stcb, addr);
12753                 else
12754                         net = NULL;
12755                 if ((net == NULL) ||
12756                     ((port != 0) && (port != stcb->rport))) {
12757                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12758                         error = EINVAL;
12759                         goto out_unlocked;
12760                 }
12761         } else {
12762                 if (stcb->asoc.alternate) {
12763                         net = stcb->asoc.alternate;
12764                 } else {
12765                         net = stcb->asoc.primary_destination;
12766                 }
12767         }
12768         atomic_add_int(&stcb->total_sends, 1);
12769         /* Keep the stcb from being freed under our feet */
12770         atomic_add_int(&asoc->refcnt, 1);
12771         free_cnt_applied = 1;
12772
12773         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12774                 if (sndlen > asoc->smallest_mtu) {
12775                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12776                         error = EMSGSIZE;
12777                         goto out_unlocked;
12778                 }
12779         }
12780         if ((SCTP_SO_IS_NBIO(so)
12781             || (flags & MSG_NBIO)
12782             )) {
12783                 non_blocking = 1;
12784         }
12785         /* would we block? */
12786         if (non_blocking) {
12787                 if (hold_tcblock == 0) {
12788                         SCTP_TCB_LOCK(stcb);
12789                         hold_tcblock = 1;
12790                 }
12791                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12792                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12793                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12794                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12795                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12796                                 error = EMSGSIZE;
12797                         else
12798                                 error = EWOULDBLOCK;
12799                         goto out_unlocked;
12800                 }
12801                 stcb->asoc.sb_send_resv += sndlen;
12802                 SCTP_TCB_UNLOCK(stcb);
12803                 hold_tcblock = 0;
12804         } else {
12805                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12806         }
12807         local_soresv = sndlen;
12808         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12809                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12810                 error = ECONNRESET;
12811                 goto out_unlocked;
12812         }
12813         if (create_lock_applied) {
12814                 SCTP_ASOC_CREATE_UNLOCK(inp);
12815                 create_lock_applied = 0;
12816         }
12817         if (asoc->stream_reset_outstanding) {
12818                 /*
12819                  * Can't queue any data while stream reset is underway.
12820                  */
12821                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12822                 error = EAGAIN;
12823                 goto out_unlocked;
12824         }
12825         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12826             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12827                 queue_only = 1;
12828         }
12829         /* we are now done with all control */
12830         if (control) {
12831                 sctp_m_freem(control);
12832                 control = NULL;
12833         }
12834         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12835             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12836             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12837             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12838                 if (srcv->sinfo_flags & SCTP_ABORT) {
12839                         ;
12840                 } else {
12841                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12842                         error = ECONNRESET;
12843                         goto out_unlocked;
12844                 }
12845         }
12846         /* Ok, we will attempt a msgsnd :> */
12847         if (p) {
12848                 p->td_ru.ru_msgsnd++;
12849         }
12850         /* Are we aborting? */
12851         if (srcv->sinfo_flags & SCTP_ABORT) {
12852                 struct mbuf *mm;
12853                 int tot_demand, tot_out = 0, max_out;
12854
12855                 SCTP_STAT_INCR(sctps_sends_with_abort);
12856                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12857                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12858                         /* It has to be up before we abort */
12859                         /* how big is the user initiated abort? */
12860                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12861                         error = EINVAL;
12862                         goto out;
12863                 }
12864                 if (hold_tcblock) {
12865                         SCTP_TCB_UNLOCK(stcb);
12866                         hold_tcblock = 0;
12867                 }
12868                 if (top) {
12869                         struct mbuf *cntm = NULL;
12870
12871                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12872                         if (sndlen != 0) {
12873                                 cntm = top;
12874                                 while (cntm) {
12875                                         tot_out += SCTP_BUF_LEN(cntm);
12876                                         cntm = SCTP_BUF_NEXT(cntm);
12877                                 }
12878                         }
12879                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12880                 } else {
12881                         /* Must fit in a MTU */
12882                         tot_out = sndlen;
12883                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12884                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12885                                 /* To big */
12886                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12887                                 error = EMSGSIZE;
12888                                 goto out;
12889                         }
12890                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12891                 }
12892                 if (mm == NULL) {
12893                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12894                         error = ENOMEM;
12895                         goto out;
12896                 }
12897                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12898                 max_out -= sizeof(struct sctp_abort_msg);
12899                 if (tot_out > max_out) {
12900                         tot_out = max_out;
12901                 }
12902                 if (mm) {
12903                         struct sctp_paramhdr *ph;
12904
12905                         /* now move forward the data pointer */
12906                         ph = mtod(mm, struct sctp_paramhdr *);
12907                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12908                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12909                         ph++;
12910                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12911                         if (top == NULL) {
12912                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12913                                 if (error) {
12914                                         /*-
12915                                          * Here if we can't get his data we
12916                                          * still abort we just don't get to
12917                                          * send the users note :-0
12918                                          */
12919                                         sctp_m_freem(mm);
12920                                         mm = NULL;
12921                                 }
12922                         } else {
12923                                 if (sndlen != 0) {
12924                                         SCTP_BUF_NEXT(mm) = top;
12925                                 }
12926                         }
12927                 }
12928                 if (hold_tcblock == 0) {
12929                         SCTP_TCB_LOCK(stcb);
12930                         hold_tcblock = 1;
12931                 }
12932                 atomic_add_int(&stcb->asoc.refcnt, -1);
12933                 free_cnt_applied = 0;
12934                 /* release this lock, otherwise we hang on ourselves */
12935                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12936                     SCTP_RESPONSE_TO_USER_REQ,
12937                     mm, SCTP_SO_LOCKED);
12938                 /* now relock the stcb so everything is sane */
12939                 hold_tcblock = 0;
12940                 stcb = NULL;
12941                 /*
12942                  * In this case top is already chained to mm avoid double
12943                  * free, since we free it below if top != NULL and driver
12944                  * would free it after sending the packet out
12945                  */
12946                 if (sndlen != 0) {
12947                         top = NULL;
12948                 }
12949                 goto out_unlocked;
12950         }
12951         /* Calculate the maximum we can send */
12952         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12953         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12954                 if (non_blocking) {
12955                         /* we already checked for non-blocking above. */
12956                         max_len = sndlen;
12957                 } else {
12958                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12959                 }
12960         } else {
12961                 max_len = 0;
12962         }
12963         if (hold_tcblock) {
12964                 SCTP_TCB_UNLOCK(stcb);
12965                 hold_tcblock = 0;
12966         }
12967         /* Is the stream no. valid? */
12968         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12969                 /* Invalid stream number */
12970                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12971                 error = EINVAL;
12972                 goto out_unlocked;
12973         }
12974         if (asoc->strmout == NULL) {
12975                 /* huh? software error */
12976                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12977                 error = EFAULT;
12978                 goto out_unlocked;
12979         }
12980         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12981         if ((user_marks_eor == 0) &&
12982             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12983                 /* It will NEVER fit */
12984                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12985                 error = EMSGSIZE;
12986                 goto out_unlocked;
12987         }
12988         if ((uio == NULL) && user_marks_eor) {
12989                 /*-
12990                  * We do not support eeor mode for
12991                  * sending with mbuf chains (like sendfile).
12992                  */
12993                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12994                 error = EINVAL;
12995                 goto out_unlocked;
12996         }
12997         if (user_marks_eor) {
12998                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12999         } else {
13000                 /*-
13001                  * For non-eeor the whole message must fit in
13002                  * the socket send buffer.
13003                  */
13004                 local_add_more = sndlen;
13005         }
13006         len = 0;
13007         if (non_blocking) {
13008                 goto skip_preblock;
13009         }
13010         if (((max_len <= local_add_more) &&
13011             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13012             (max_len == 0) ||
13013             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13014                 /* No room right now ! */
13015                 SOCKBUF_LOCK(&so->so_snd);
13016                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13017                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13018                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13019                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13020                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13021                             inqueue_bytes,
13022                             local_add_more,
13023                             stcb->asoc.stream_queue_cnt,
13024                             stcb->asoc.chunks_on_out_queue,
13025                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13026                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13027                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
13028                         }
13029                         be.error = 0;
13030                         stcb->block_entry = &be;
13031                         error = sbwait(&so->so_snd);
13032                         stcb->block_entry = NULL;
13033                         if (error || so->so_error || be.error) {
13034                                 if (error == 0) {
13035                                         if (so->so_error)
13036                                                 error = so->so_error;
13037                                         if (be.error) {
13038                                                 error = be.error;
13039                                         }
13040                                 }
13041                                 SOCKBUF_UNLOCK(&so->so_snd);
13042                                 goto out_unlocked;
13043                         }
13044                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13045                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13046                                     so, asoc, stcb->asoc.total_output_queue_size);
13047                         }
13048                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13049                                 goto out_unlocked;
13050                         }
13051                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13052                 }
13053                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13054                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13055                 } else {
13056                         max_len = 0;
13057                 }
13058                 SOCKBUF_UNLOCK(&so->so_snd);
13059         }
13060 skip_preblock:
13061         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13062                 goto out_unlocked;
13063         }
13064         /*
13065          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13066          * case NOTE: uio will be null when top/mbuf is passed
13067          */
13068         if (sndlen == 0) {
13069                 if (srcv->sinfo_flags & SCTP_EOF) {
13070                         got_all_of_the_send = 1;
13071                         goto dataless_eof;
13072                 } else {
13073                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13074                         error = EINVAL;
13075                         goto out;
13076                 }
13077         }
13078         if (top == NULL) {
13079                 struct sctp_stream_queue_pending *sp;
13080                 struct sctp_stream_out *strm;
13081                 uint32_t sndout;
13082
13083                 SCTP_TCB_SEND_LOCK(stcb);
13084                 if ((asoc->stream_locked) &&
13085                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13086                         SCTP_TCB_SEND_UNLOCK(stcb);
13087                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13088                         error = EINVAL;
13089                         goto out;
13090                 }
13091                 SCTP_TCB_SEND_UNLOCK(stcb);
13092
13093                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13094                 if (strm->last_msg_incomplete == 0) {
13095         do_a_copy_in:
13096                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
13097                         if ((sp == NULL) || (error)) {
13098                                 goto out;
13099                         }
13100                         SCTP_TCB_SEND_LOCK(stcb);
13101                         if (sp->msg_is_complete) {
13102                                 strm->last_msg_incomplete = 0;
13103                                 asoc->stream_locked = 0;
13104                         } else {
13105                                 /*
13106                                  * Just got locked to this guy in case of an
13107                                  * interrupt.
13108                                  */
13109                                 strm->last_msg_incomplete = 1;
13110                                 asoc->stream_locked = 1;
13111                                 asoc->stream_locked_on = srcv->sinfo_stream;
13112                                 sp->sender_all_done = 0;
13113                         }
13114                         sctp_snd_sb_alloc(stcb, sp->length);
13115                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13116                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13117                                 sp->strseq = strm->next_sequence_sent;
13118                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13119                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13120                                             (uintptr_t) stcb, sp->length,
13121                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13122                                 }
13123                                 strm->next_sequence_sent++;
13124                         } else {
13125                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13126                         }
13127                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13128                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13129                         SCTP_TCB_SEND_UNLOCK(stcb);
13130                 } else {
13131                         SCTP_TCB_SEND_LOCK(stcb);
13132                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13133                         SCTP_TCB_SEND_UNLOCK(stcb);
13134                         if (sp == NULL) {
13135                                 /* ???? Huh ??? last msg is gone */
13136 #ifdef INVARIANTS
13137                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13138 #else
13139                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13140                                 strm->last_msg_incomplete = 0;
13141 #endif
13142                                 goto do_a_copy_in;
13143
13144                         }
13145                 }
13146                 while (uio->uio_resid > 0) {
13147                         /* How much room do we have? */
13148                         struct mbuf *new_tail, *mm;
13149
13150                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13151                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13152                         else
13153                                 max_len = 0;
13154
13155                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13156                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13157                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13158                                 sndout = 0;
13159                                 new_tail = NULL;
13160                                 if (hold_tcblock) {
13161                                         SCTP_TCB_UNLOCK(stcb);
13162                                         hold_tcblock = 0;
13163                                 }
13164                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
13165                                 if ((mm == NULL) || error) {
13166                                         if (mm) {
13167                                                 sctp_m_freem(mm);
13168                                         }
13169                                         goto out;
13170                                 }
13171                                 /* Update the mbuf and count */
13172                                 SCTP_TCB_SEND_LOCK(stcb);
13173                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13174                                         /*
13175                                          * we need to get out. Peer probably
13176                                          * aborted.
13177                                          */
13178                                         sctp_m_freem(mm);
13179                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13180                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13181                                                 error = ECONNRESET;
13182                                         }
13183                                         SCTP_TCB_SEND_UNLOCK(stcb);
13184                                         goto out;
13185                                 }
13186                                 if (sp->tail_mbuf) {
13187                                         /* tack it to the end */
13188                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13189                                         sp->tail_mbuf = new_tail;
13190                                 } else {
13191                                         /* A stolen mbuf */
13192                                         sp->data = mm;
13193                                         sp->tail_mbuf = new_tail;
13194                                 }
13195                                 sctp_snd_sb_alloc(stcb, sndout);
13196                                 atomic_add_int(&sp->length, sndout);
13197                                 len += sndout;
13198
13199                                 /* Did we reach EOR? */
13200                                 if ((uio->uio_resid == 0) &&
13201                                     ((user_marks_eor == 0) ||
13202                                     (srcv->sinfo_flags & SCTP_EOF) ||
13203                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13204                                         sp->msg_is_complete = 1;
13205                                 } else {
13206                                         sp->msg_is_complete = 0;
13207                                 }
13208                                 SCTP_TCB_SEND_UNLOCK(stcb);
13209                         }
13210                         if (uio->uio_resid == 0) {
13211                                 /* got it all? */
13212                                 continue;
13213                         }
13214                         /* PR-SCTP? */
13215                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13216                                 /*
13217                                  * This is ugly but we must assure locking
13218                                  * order
13219                                  */
13220                                 if (hold_tcblock == 0) {
13221                                         SCTP_TCB_LOCK(stcb);
13222                                         hold_tcblock = 1;
13223                                 }
13224                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13225                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13226                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13227                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13228                                 else
13229                                         max_len = 0;
13230                                 if (max_len > 0) {
13231                                         continue;
13232                                 }
13233                                 SCTP_TCB_UNLOCK(stcb);
13234                                 hold_tcblock = 0;
13235                         }
13236                         /* wait for space now */
13237                         if (non_blocking) {
13238                                 /* Non-blocking io in place out */
13239                                 goto skip_out_eof;
13240                         }
13241                         /* What about the INIT, send it maybe */
13242                         if (queue_only_for_init) {
13243                                 if (hold_tcblock == 0) {
13244                                         SCTP_TCB_LOCK(stcb);
13245                                         hold_tcblock = 1;
13246                                 }
13247                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13248                                         /* a collision took us forward? */
13249                                         queue_only = 0;
13250                                 } else {
13251                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13252                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13253                                         queue_only = 1;
13254                                 }
13255                         }
13256                         if ((net->flight_size > net->cwnd) &&
13257                             (asoc->sctp_cmt_on_off == 0)) {
13258                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13259                                 queue_only = 1;
13260                         } else if (asoc->ifp_had_enobuf) {
13261                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13262                                 if (net->flight_size > (2 * net->mtu)) {
13263                                         queue_only = 1;
13264                                 }
13265                                 asoc->ifp_had_enobuf = 0;
13266                         }
13267                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13268                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13269                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13270                             (stcb->asoc.total_flight > 0) &&
13271                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13272                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13273
13274                                 /*-
13275                                  * Ok, Nagle is set on and we have data outstanding.
13276                                  * Don't send anything and let SACKs drive out the
13277                                  * data unless wen have a "full" segment to send.
13278                                  */
13279                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13280                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13281                                 }
13282                                 SCTP_STAT_INCR(sctps_naglequeued);
13283                                 nagle_applies = 1;
13284                         } else {
13285                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13286                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13287                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13288                                 }
13289                                 SCTP_STAT_INCR(sctps_naglesent);
13290                                 nagle_applies = 0;
13291                         }
13292                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13293
13294                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13295                                     nagle_applies, un_sent);
13296                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13297                                     stcb->asoc.total_flight,
13298                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13299                         }
13300                         if (queue_only_for_init)
13301                                 queue_only_for_init = 0;
13302                         if ((queue_only == 0) && (nagle_applies == 0)) {
13303                                 /*-
13304                                  * need to start chunk output
13305                                  * before blocking.. note that if
13306                                  * a lock is already applied, then
13307                                  * the input via the net is happening
13308                                  * and I don't need to start output :-D
13309                                  */
13310                                 if (hold_tcblock == 0) {
13311                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13312                                                 hold_tcblock = 1;
13313                                                 sctp_chunk_output(inp,
13314                                                     stcb,
13315                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13316                                         }
13317                                 } else {
13318                                         sctp_chunk_output(inp,
13319                                             stcb,
13320                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13321                                 }
13322                                 if (hold_tcblock == 1) {
13323                                         SCTP_TCB_UNLOCK(stcb);
13324                                         hold_tcblock = 0;
13325                                 }
13326                         }
13327                         SOCKBUF_LOCK(&so->so_snd);
13328                         /*-
13329                          * This is a bit strange, but I think it will
13330                          * work. The total_output_queue_size is locked and
13331                          * protected by the TCB_LOCK, which we just released.
13332                          * There is a race that can occur between releasing it
13333                          * above, and me getting the socket lock, where sacks
13334                          * come in but we have not put the SB_WAIT on the
13335                          * so_snd buffer to get the wakeup. After the LOCK
13336                          * is applied the sack_processing will also need to
13337                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13338                          * once we have the socket buffer lock if we recheck the
13339                          * size we KNOW we will get to sleep safely with the
13340                          * wakeup flag in place.
13341                          */
13342                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13343                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13344                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13345                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13346                                             so, asoc, uio->uio_resid);
13347                                 }
13348                                 be.error = 0;
13349                                 stcb->block_entry = &be;
13350                                 error = sbwait(&so->so_snd);
13351                                 stcb->block_entry = NULL;
13352
13353                                 if (error || so->so_error || be.error) {
13354                                         if (error == 0) {
13355                                                 if (so->so_error)
13356                                                         error = so->so_error;
13357                                                 if (be.error) {
13358                                                         error = be.error;
13359                                                 }
13360                                         }
13361                                         SOCKBUF_UNLOCK(&so->so_snd);
13362                                         goto out_unlocked;
13363                                 }
13364                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13365                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13366                                             so, asoc, stcb->asoc.total_output_queue_size);
13367                                 }
13368                         }
13369                         SOCKBUF_UNLOCK(&so->so_snd);
13370                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13371                                 goto out_unlocked;
13372                         }
13373                 }
13374                 SCTP_TCB_SEND_LOCK(stcb);
13375                 if (sp) {
13376                         if (sp->msg_is_complete == 0) {
13377                                 strm->last_msg_incomplete = 1;
13378                                 asoc->stream_locked = 1;
13379                                 asoc->stream_locked_on = srcv->sinfo_stream;
13380                         } else {
13381                                 sp->sender_all_done = 1;
13382                                 strm->last_msg_incomplete = 0;
13383                                 asoc->stream_locked = 0;
13384                         }
13385                 } else {
13386                         SCTP_PRINTF("Huh no sp TSNH?\n");
13387                         strm->last_msg_incomplete = 0;
13388                         asoc->stream_locked = 0;
13389                 }
13390                 SCTP_TCB_SEND_UNLOCK(stcb);
13391                 if (uio->uio_resid == 0) {
13392                         got_all_of_the_send = 1;
13393                 }
13394         } else {
13395                 /* We send in a 0, since we do NOT have any locks */
13396                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13397                 top = NULL;
13398                 if (srcv->sinfo_flags & SCTP_EOF) {
13399                         /*
13400                          * This should only happen for Panda for the mbuf
13401                          * send case, which does NOT yet support EEOR mode.
13402                          * Thus, we can just set this flag to do the proper
13403                          * EOF handling.
13404                          */
13405                         got_all_of_the_send = 1;
13406                 }
13407         }
13408         if (error) {
13409                 goto out;
13410         }
13411 dataless_eof:
13412         /* EOF thing ? */
13413         if ((srcv->sinfo_flags & SCTP_EOF) &&
13414             (got_all_of_the_send == 1) &&
13415             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13416                 int cnt;
13417
13418                 SCTP_STAT_INCR(sctps_sends_with_eof);
13419                 error = 0;
13420                 if (hold_tcblock == 0) {
13421                         SCTP_TCB_LOCK(stcb);
13422                         hold_tcblock = 1;
13423                 }
13424                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13425                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13426                     TAILQ_EMPTY(&asoc->sent_queue) &&
13427                     (cnt == 0)) {
13428                         if (asoc->locked_on_sending) {
13429                                 goto abort_anyway;
13430                         }
13431                         /* there is nothing queued to send, so I'm done... */
13432                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13433                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13434                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13435                                 struct sctp_nets *netp;
13436
13437                                 if (stcb->asoc.alternate) {
13438                                         netp = stcb->asoc.alternate;
13439                                 } else {
13440                                         netp = stcb->asoc.primary_destination;
13441                                 }
13442                                 /* only send SHUTDOWN the first time through */
13443                                 sctp_send_shutdown(stcb, netp);
13444                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13445                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13446                                 }
13447                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13448                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13449                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13450                                     netp);
13451                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13452                                     asoc->primary_destination);
13453                         }
13454                 } else {
13455                         /*-
13456                          * we still got (or just got) data to send, so set
13457                          * SHUTDOWN_PENDING
13458                          */
13459                         /*-
13460                          * XXX sockets draft says that SCTP_EOF should be
13461                          * sent with no data.  currently, we will allow user
13462                          * data to be sent first and move to
13463                          * SHUTDOWN-PENDING
13464                          */
13465                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13466                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13467                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13468                                 if (hold_tcblock == 0) {
13469                                         SCTP_TCB_LOCK(stcb);
13470                                         hold_tcblock = 1;
13471                                 }
13472                                 if (asoc->locked_on_sending) {
13473                                         /* Locked to send out the data */
13474                                         struct sctp_stream_queue_pending *sp;
13475
13476                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13477                                         if (sp) {
13478                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13479                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13480                                         }
13481                                 }
13482                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13483                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13484                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13485                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13486                         abort_anyway:
13487                                         if (free_cnt_applied) {
13488                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13489                                                 free_cnt_applied = 0;
13490                                         }
13491                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13492                                             SCTP_RESPONSE_TO_USER_REQ,
13493                                             NULL, SCTP_SO_LOCKED);
13494                                         /*
13495                                          * now relock the stcb so everything
13496                                          * is sane
13497                                          */
13498                                         hold_tcblock = 0;
13499                                         stcb = NULL;
13500                                         goto out;
13501                                 }
13502                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13503                                     asoc->primary_destination);
13504                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13505                         }
13506                 }
13507         }
13508 skip_out_eof:
13509         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13510                 some_on_control = 1;
13511         }
13512         if (queue_only_for_init) {
13513                 if (hold_tcblock == 0) {
13514                         SCTP_TCB_LOCK(stcb);
13515                         hold_tcblock = 1;
13516                 }
13517                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13518                         /* a collision took us forward? */
13519                         queue_only = 0;
13520                 } else {
13521                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13522                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13523                         queue_only = 1;
13524                 }
13525         }
13526         if ((net->flight_size > net->cwnd) &&
13527             (stcb->asoc.sctp_cmt_on_off == 0)) {
13528                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13529                 queue_only = 1;
13530         } else if (asoc->ifp_had_enobuf) {
13531                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13532                 if (net->flight_size > (2 * net->mtu)) {
13533                         queue_only = 1;
13534                 }
13535                 asoc->ifp_had_enobuf = 0;
13536         }
13537         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13538             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13539         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13540             (stcb->asoc.total_flight > 0) &&
13541             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13542             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13543                 /*-
13544                  * Ok, Nagle is set on and we have data outstanding.
13545                  * Don't send anything and let SACKs drive out the
13546                  * data unless wen have a "full" segment to send.
13547                  */
13548                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13549                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13550                 }
13551                 SCTP_STAT_INCR(sctps_naglequeued);
13552                 nagle_applies = 1;
13553         } else {
13554                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13555                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13556                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13557                 }
13558                 SCTP_STAT_INCR(sctps_naglesent);
13559                 nagle_applies = 0;
13560         }
13561         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13562                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13563                     nagle_applies, un_sent);
13564                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13565                     stcb->asoc.total_flight,
13566                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13567         }
13568         if (queue_only_for_init)
13569                 queue_only_for_init = 0;
13570         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13571                 /* we can attempt to send too. */
13572                 if (hold_tcblock == 0) {
13573                         /*
13574                          * If there is activity recv'ing sacks no need to
13575                          * send
13576                          */
13577                         if (SCTP_TCB_TRYLOCK(stcb)) {
13578                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13579                                 hold_tcblock = 1;
13580                         }
13581                 } else {
13582                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13583                 }
13584         } else if ((queue_only == 0) &&
13585                     (stcb->asoc.peers_rwnd == 0) &&
13586             (stcb->asoc.total_flight == 0)) {
13587                 /* We get to have a probe outstanding */
13588                 if (hold_tcblock == 0) {
13589                         hold_tcblock = 1;
13590                         SCTP_TCB_LOCK(stcb);
13591                 }
13592                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13593         } else if (some_on_control) {
13594                 int num_out, reason, frag_point;
13595
13596                 /* Here we do control only */
13597                 if (hold_tcblock == 0) {
13598                         hold_tcblock = 1;
13599                         SCTP_TCB_LOCK(stcb);
13600                 }
13601                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13602                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13603                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13604         }
13605         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13606             queue_only, stcb->asoc.peers_rwnd, un_sent,
13607             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13608             stcb->asoc.total_output_queue_size, error);
13609
13610 out:
13611 out_unlocked:
13612
13613         if (local_soresv && stcb) {
13614                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13615                 local_soresv = 0;
13616         }
13617         if (create_lock_applied) {
13618                 SCTP_ASOC_CREATE_UNLOCK(inp);
13619                 create_lock_applied = 0;
13620         }
13621         if ((stcb) && hold_tcblock) {
13622                 SCTP_TCB_UNLOCK(stcb);
13623         }
13624         if (stcb && free_cnt_applied) {
13625                 atomic_add_int(&stcb->asoc.refcnt, -1);
13626         }
13627 #ifdef INVARIANTS
13628         if (stcb) {
13629                 if (mtx_owned(&stcb->tcb_mtx)) {
13630                         panic("Leaving with tcb mtx owned?");
13631                 }
13632                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13633                         panic("Leaving with tcb send mtx owned?");
13634                 }
13635         }
13636 #endif
13637 #ifdef INVARIANTS
13638         if (inp) {
13639                 sctp_validate_no_locks(inp);
13640         } else {
13641                 printf("Warning - inp is NULL so cant validate locks\n");
13642         }
13643 #endif
13644         if (top) {
13645                 sctp_m_freem(top);
13646         }
13647         if (control) {
13648                 sctp_m_freem(control);
13649         }
13650         return (error);
13651 }
13652
13653
13654 /*
13655  * generate an AUTHentication chunk, if required
13656  */
13657 struct mbuf *
13658 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13659     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13660     struct sctp_tcb *stcb, uint8_t chunk)
13661 {
13662         struct mbuf *m_auth;
13663         struct sctp_auth_chunk *auth;
13664         int chunk_len;
13665
13666         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13667             (stcb == NULL))
13668                 return (m);
13669
13670         /* sysctl disabled auth? */
13671         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13672                 return (m);
13673
13674         /* peer doesn't do auth... */
13675         if (!stcb->asoc.peer_supports_auth) {
13676                 return (m);
13677         }
13678         /* does the requested chunk require auth? */
13679         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13680                 return (m);
13681         }
13682         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13683         if (m_auth == NULL) {
13684                 /* no mbuf's */
13685                 return (m);
13686         }
13687         /* reserve some space if this will be the first mbuf */
13688         if (m == NULL)
13689                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13690         /* fill in the AUTH chunk details */
13691         auth = mtod(m_auth, struct sctp_auth_chunk *);
13692         bzero(auth, sizeof(*auth));
13693         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13694         auth->ch.chunk_flags = 0;
13695         chunk_len = sizeof(*auth) +
13696             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13697         auth->ch.chunk_length = htons(chunk_len);
13698         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13699         /* key id and hmac digest will be computed and filled in upon send */
13700
13701         /* save the offset where the auth was inserted into the chain */
13702         if (m != NULL) {
13703                 struct mbuf *cn;
13704
13705                 *offset = 0;
13706                 cn = m;
13707                 while (cn) {
13708                         *offset += SCTP_BUF_LEN(cn);
13709                         cn = SCTP_BUF_NEXT(cn);
13710                 }
13711         } else
13712                 *offset = 0;
13713
13714         /* update length and return pointer to the auth chunk */
13715         SCTP_BUF_LEN(m_auth) = chunk_len;
13716         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13717         if (auth_ret != NULL)
13718                 *auth_ret = auth;
13719
13720         return (m);
13721 }
13722
13723 #ifdef INET6
13724 int
13725 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13726 {
13727         struct nd_prefix *pfx = NULL;
13728         struct nd_pfxrouter *pfxrtr = NULL;
13729         struct sockaddr_in6 gw6;
13730
13731         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13732                 return (0);
13733
13734         /* get prefix entry of address */
13735         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13736                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13737                         continue;
13738                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13739                     &src6->sin6_addr, &pfx->ndpr_mask))
13740                         break;
13741         }
13742         /* no prefix entry in the prefix list */
13743         if (pfx == NULL) {
13744                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13745                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13746                 return (0);
13747         }
13748         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13749         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13750
13751         /* search installed gateway from prefix entry */
13752         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13753             pfxrtr->pfr_next) {
13754                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13755                 gw6.sin6_family = AF_INET6;
13756                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13757                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13758                     sizeof(struct in6_addr));
13759                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13760                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13761                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13762                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13763                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13764                     ro->ro_rt->rt_gateway)) {
13765                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13766                         return (1);
13767                 }
13768         }
13769         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13770         return (0);
13771 }
13772
13773 #endif
13774
13775 int
13776 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13777 {
13778 #ifdef INET
13779         struct sockaddr_in *sin, *mask;
13780         struct ifaddr *ifa;
13781         struct in_addr srcnetaddr, gwnetaddr;
13782
13783         if (ro == NULL || ro->ro_rt == NULL ||
13784             sifa->address.sa.sa_family != AF_INET) {
13785                 return (0);
13786         }
13787         ifa = (struct ifaddr *)sifa->ifa;
13788         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13789         sin = (struct sockaddr_in *)&sifa->address.sin;
13790         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13791         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13792         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13793         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13794
13795         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13796         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13797         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13798         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13799         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13800         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13801                 return (1);
13802         }
13803 #endif
13804         return (0);
13805 }