sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59
  60
  61 #define SCTP_MAX_GAPS_INARRAY 4
  62 struct sack_track {
  63         uint8_t right_edge;     /* mergable on the right edge */
  64         uint8_t left_edge;      /* mergable on the left edge */
  65         uint8_t num_entries;
  66         uint8_t spare;
  67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  68 };
  69
  70 struct sack_track sack_array[256] = {
  71         {0, 0, 0, 0,            /* 0x00 */
  72                 {{0, 0},
  73                 {0, 0},
  74                 {0, 0},
  75                 {0, 0}
  76                 }
  77         },
  78         {1, 0, 1, 0,            /* 0x01 */
  79                 {{0, 0},
  80                 {0, 0},
  81                 {0, 0},
  82                 {0, 0}
  83                 }
  84         },
  85         {0, 0, 1, 0,            /* 0x02 */
  86                 {{1, 1},
  87                 {0, 0},
  88                 {0, 0},
  89                 {0, 0}
  90                 }
  91         },
  92         {1, 0, 1, 0,            /* 0x03 */
  93                 {{0, 1},
  94                 {0, 0},
  95                 {0, 0},
  96                 {0, 0}
  97                 }
  98         },
  99         {0, 0, 1, 0,            /* 0x04 */
 100                 {{2, 2},
 101                 {0, 0},
 102                 {0, 0},
 103                 {0, 0}
 104                 }
 105         },
 106         {1, 0, 2, 0,            /* 0x05 */
 107                 {{0, 0},
 108                 {2, 2},
 109                 {0, 0},
 110                 {0, 0}
 111                 }
 112         },
 113         {0, 0, 1, 0,            /* 0x06 */
 114                 {{1, 2},
 115                 {0, 0},
 116                 {0, 0},
 117                 {0, 0}
 118                 }
 119         },
 120         {1, 0, 1, 0,            /* 0x07 */
 121                 {{0, 2},
 122                 {0, 0},
 123                 {0, 0},
 124                 {0, 0}
 125                 }
 126         },
 127         {0, 0, 1, 0,            /* 0x08 */
 128                 {{3, 3},
 129                 {0, 0},
 130                 {0, 0},
 131                 {0, 0}
 132                 }
 133         },
 134         {1, 0, 2, 0,            /* 0x09 */
 135                 {{0, 0},
 136                 {3, 3},
 137                 {0, 0},
 138                 {0, 0}
 139                 }
 140         },
 141         {0, 0, 2, 0,            /* 0x0a */
 142                 {{1, 1},
 143                 {3, 3},
 144                 {0, 0},
 145                 {0, 0}
 146                 }
 147         },
 148         {1, 0, 2, 0,            /* 0x0b */
 149                 {{0, 1},
 150                 {3, 3},
 151                 {0, 0},
 152                 {0, 0}
 153                 }
 154         },
 155         {0, 0, 1, 0,            /* 0x0c */
 156                 {{2, 3},
 157                 {0, 0},
 158                 {0, 0},
 159                 {0, 0}
 160                 }
 161         },
 162         {1, 0, 2, 0,            /* 0x0d */
 163                 {{0, 0},
 164                 {2, 3},
 165                 {0, 0},
 166                 {0, 0}
 167                 }
 168         },
 169         {0, 0, 1, 0,            /* 0x0e */
 170                 {{1, 3},
 171                 {0, 0},
 172                 {0, 0},
 173                 {0, 0}
 174                 }
 175         },
 176         {1, 0, 1, 0,            /* 0x0f */
 177                 {{0, 3},
 178                 {0, 0},
 179                 {0, 0},
 180                 {0, 0}
 181                 }
 182         },
 183         {0, 0, 1, 0,            /* 0x10 */
 184                 {{4, 4},
 185                 {0, 0},
 186                 {0, 0},
 187                 {0, 0}
 188                 }
 189         },
 190         {1, 0, 2, 0,            /* 0x11 */
 191                 {{0, 0},
 192                 {4, 4},
 193                 {0, 0},
 194                 {0, 0}
 195                 }
 196         },
 197         {0, 0, 2, 0,            /* 0x12 */
 198                 {{1, 1},
 199                 {4, 4},
 200                 {0, 0},
 201                 {0, 0}
 202                 }
 203         },
 204         {1, 0, 2, 0,            /* 0x13 */
 205                 {{0, 1},
 206                 {4, 4},
 207                 {0, 0},
 208                 {0, 0}
 209                 }
 210         },
 211         {0, 0, 2, 0,            /* 0x14 */
 212                 {{2, 2},
 213                 {4, 4},
 214                 {0, 0},
 215                 {0, 0}
 216                 }
 217         },
 218         {1, 0, 3, 0,            /* 0x15 */
 219                 {{0, 0},
 220                 {2, 2},
 221                 {4, 4},
 222                 {0, 0}
 223                 }
 224         },
 225         {0, 0, 2, 0,            /* 0x16 */
 226                 {{1, 2},
 227                 {4, 4},
 228                 {0, 0},
 229                 {0, 0}
 230                 }
 231         },
 232         {1, 0, 2, 0,            /* 0x17 */
 233                 {{0, 2},
 234                 {4, 4},
 235                 {0, 0},
 236                 {0, 0}
 237                 }
 238         },
 239         {0, 0, 1, 0,            /* 0x18 */
 240                 {{3, 4},
 241                 {0, 0},
 242                 {0, 0},
 243                 {0, 0}
 244                 }
 245         },
 246         {1, 0, 2, 0,            /* 0x19 */
 247                 {{0, 0},
 248                 {3, 4},
 249                 {0, 0},
 250                 {0, 0}
 251                 }
 252         },
 253         {0, 0, 2, 0,            /* 0x1a */
 254                 {{1, 1},
 255                 {3, 4},
 256                 {0, 0},
 257                 {0, 0}
 258                 }
 259         },
 260         {1, 0, 2, 0,            /* 0x1b */
 261                 {{0, 1},
 262                 {3, 4},
 263                 {0, 0},
 264                 {0, 0}
 265                 }
 266         },
 267         {0, 0, 1, 0,            /* 0x1c */
 268                 {{2, 4},
 269                 {0, 0},
 270                 {0, 0},
 271                 {0, 0}
 272                 }
 273         },
 274         {1, 0, 2, 0,            /* 0x1d */
 275                 {{0, 0},
 276                 {2, 4},
 277                 {0, 0},
 278                 {0, 0}
 279                 }
 280         },
 281         {0, 0, 1, 0,            /* 0x1e */
 282                 {{1, 4},
 283                 {0, 0},
 284                 {0, 0},
 285                 {0, 0}
 286                 }
 287         },
 288         {1, 0, 1, 0,            /* 0x1f */
 289                 {{0, 4},
 290                 {0, 0},
 291                 {0, 0},
 292                 {0, 0}
 293                 }
 294         },
 295         {0, 0, 1, 0,            /* 0x20 */
 296                 {{5, 5},
 297                 {0, 0},
 298                 {0, 0},
 299                 {0, 0}
 300                 }
 301         },
 302         {1, 0, 2, 0,            /* 0x21 */
 303                 {{0, 0},
 304                 {5, 5},
 305                 {0, 0},
 306                 {0, 0}
 307                 }
 308         },
 309         {0, 0, 2, 0,            /* 0x22 */
 310                 {{1, 1},
 311                 {5, 5},
 312                 {0, 0},
 313                 {0, 0}
 314                 }
 315         },
 316         {1, 0, 2, 0,            /* 0x23 */
 317                 {{0, 1},
 318                 {5, 5},
 319                 {0, 0},
 320                 {0, 0}
 321                 }
 322         },
 323         {0, 0, 2, 0,            /* 0x24 */
 324                 {{2, 2},
 325                 {5, 5},
 326                 {0, 0},
 327                 {0, 0}
 328                 }
 329         },
 330         {1, 0, 3, 0,            /* 0x25 */
 331                 {{0, 0},
 332                 {2, 2},
 333                 {5, 5},
 334                 {0, 0}
 335                 }
 336         },
 337         {0, 0, 2, 0,            /* 0x26 */
 338                 {{1, 2},
 339                 {5, 5},
 340                 {0, 0},
 341                 {0, 0}
 342                 }
 343         },
 344         {1, 0, 2, 0,            /* 0x27 */
 345                 {{0, 2},
 346                 {5, 5},
 347                 {0, 0},
 348                 {0, 0}
 349                 }
 350         },
 351         {0, 0, 2, 0,            /* 0x28 */
 352                 {{3, 3},
 353                 {5, 5},
 354                 {0, 0},
 355                 {0, 0}
 356                 }
 357         },
 358         {1, 0, 3, 0,            /* 0x29 */
 359                 {{0, 0},
 360                 {3, 3},
 361                 {5, 5},
 362                 {0, 0}
 363                 }
 364         },
 365         {0, 0, 3, 0,            /* 0x2a */
 366                 {{1, 1},
 367                 {3, 3},
 368                 {5, 5},
 369                 {0, 0}
 370                 }
 371         },
 372         {1, 0, 3, 0,            /* 0x2b */
 373                 {{0, 1},
 374                 {3, 3},
 375                 {5, 5},
 376                 {0, 0}
 377                 }
 378         },
 379         {0, 0, 2, 0,            /* 0x2c */
 380                 {{2, 3},
 381                 {5, 5},
 382                 {0, 0},
 383                 {0, 0}
 384                 }
 385         },
 386         {1, 0, 3, 0,            /* 0x2d */
 387                 {{0, 0},
 388                 {2, 3},
 389                 {5, 5},
 390                 {0, 0}
 391                 }
 392         },
 393         {0, 0, 2, 0,            /* 0x2e */
 394                 {{1, 3},
 395                 {5, 5},
 396                 {0, 0},
 397                 {0, 0}
 398                 }
 399         },
 400         {1, 0, 2, 0,            /* 0x2f */
 401                 {{0, 3},
 402                 {5, 5},
 403                 {0, 0},
 404                 {0, 0}
 405                 }
 406         },
 407         {0, 0, 1, 0,            /* 0x30 */
 408                 {{4, 5},
 409                 {0, 0},
 410                 {0, 0},
 411                 {0, 0}
 412                 }
 413         },
 414         {1, 0, 2, 0,            /* 0x31 */
 415                 {{0, 0},
 416                 {4, 5},
 417                 {0, 0},
 418                 {0, 0}
 419                 }
 420         },
 421         {0, 0, 2, 0,            /* 0x32 */
 422                 {{1, 1},
 423                 {4, 5},
 424                 {0, 0},
 425                 {0, 0}
 426                 }
 427         },
 428         {1, 0, 2, 0,            /* 0x33 */
 429                 {{0, 1},
 430                 {4, 5},
 431                 {0, 0},
 432                 {0, 0}
 433                 }
 434         },
 435         {0, 0, 2, 0,            /* 0x34 */
 436                 {{2, 2},
 437                 {4, 5},
 438                 {0, 0},
 439                 {0, 0}
 440                 }
 441         },
 442         {1, 0, 3, 0,            /* 0x35 */
 443                 {{0, 0},
 444                 {2, 2},
 445                 {4, 5},
 446                 {0, 0}
 447                 }
 448         },
 449         {0, 0, 2, 0,            /* 0x36 */
 450                 {{1, 2},
 451                 {4, 5},
 452                 {0, 0},
 453                 {0, 0}
 454                 }
 455         },
 456         {1, 0, 2, 0,            /* 0x37 */
 457                 {{0, 2},
 458                 {4, 5},
 459                 {0, 0},
 460                 {0, 0}
 461                 }
 462         },
 463         {0, 0, 1, 0,            /* 0x38 */
 464                 {{3, 5},
 465                 {0, 0},
 466                 {0, 0},
 467                 {0, 0}
 468                 }
 469         },
 470         {1, 0, 2, 0,            /* 0x39 */
 471                 {{0, 0},
 472                 {3, 5},
 473                 {0, 0},
 474                 {0, 0}
 475                 }
 476         },
 477         {0, 0, 2, 0,            /* 0x3a */
 478                 {{1, 1},
 479                 {3, 5},
 480                 {0, 0},
 481                 {0, 0}
 482                 }
 483         },
 484         {1, 0, 2, 0,            /* 0x3b */
 485                 {{0, 1},
 486                 {3, 5},
 487                 {0, 0},
 488                 {0, 0}
 489                 }
 490         },
 491         {0, 0, 1, 0,            /* 0x3c */
 492                 {{2, 5},
 493                 {0, 0},
 494                 {0, 0},
 495                 {0, 0}
 496                 }
 497         },
 498         {1, 0, 2, 0,            /* 0x3d */
 499                 {{0, 0},
 500                 {2, 5},
 501                 {0, 0},
 502                 {0, 0}
 503                 }
 504         },
 505         {0, 0, 1, 0,            /* 0x3e */
 506                 {{1, 5},
 507                 {0, 0},
 508                 {0, 0},
 509                 {0, 0}
 510                 }
 511         },
 512         {1, 0, 1, 0,            /* 0x3f */
 513                 {{0, 5},
 514                 {0, 0},
 515                 {0, 0},
 516                 {0, 0}
 517                 }
 518         },
 519         {0, 0, 1, 0,            /* 0x40 */
 520                 {{6, 6},
 521                 {0, 0},
 522                 {0, 0},
 523                 {0, 0}
 524                 }
 525         },
 526         {1, 0, 2, 0,            /* 0x41 */
 527                 {{0, 0},
 528                 {6, 6},
 529                 {0, 0},
 530                 {0, 0}
 531                 }
 532         },
 533         {0, 0, 2, 0,            /* 0x42 */
 534                 {{1, 1},
 535                 {6, 6},
 536                 {0, 0},
 537                 {0, 0}
 538                 }
 539         },
 540         {1, 0, 2, 0,            /* 0x43 */
 541                 {{0, 1},
 542                 {6, 6},
 543                 {0, 0},
 544                 {0, 0}
 545                 }
 546         },
 547         {0, 0, 2, 0,            /* 0x44 */
 548                 {{2, 2},
 549                 {6, 6},
 550                 {0, 0},
 551                 {0, 0}
 552                 }
 553         },
 554         {1, 0, 3, 0,            /* 0x45 */
 555                 {{0, 0},
 556                 {2, 2},
 557                 {6, 6},
 558                 {0, 0}
 559                 }
 560         },
 561         {0, 0, 2, 0,            /* 0x46 */
 562                 {{1, 2},
 563                 {6, 6},
 564                 {0, 0},
 565                 {0, 0}
 566                 }
 567         },
 568         {1, 0, 2, 0,            /* 0x47 */
 569                 {{0, 2},
 570                 {6, 6},
 571                 {0, 0},
 572                 {0, 0}
 573                 }
 574         },
 575         {0, 0, 2, 0,            /* 0x48 */
 576                 {{3, 3},
 577                 {6, 6},
 578                 {0, 0},
 579                 {0, 0}
 580                 }
 581         },
 582         {1, 0, 3, 0,            /* 0x49 */
 583                 {{0, 0},
 584                 {3, 3},
 585                 {6, 6},
 586                 {0, 0}
 587                 }
 588         },
 589         {0, 0, 3, 0,            /* 0x4a */
 590                 {{1, 1},
 591                 {3, 3},
 592                 {6, 6},
 593                 {0, 0}
 594                 }
 595         },
 596         {1, 0, 3, 0,            /* 0x4b */
 597                 {{0, 1},
 598                 {3, 3},
 599                 {6, 6},
 600                 {0, 0}
 601                 }
 602         },
 603         {0, 0, 2, 0,            /* 0x4c */
 604                 {{2, 3},
 605                 {6, 6},
 606                 {0, 0},
 607                 {0, 0}
 608                 }
 609         },
 610         {1, 0, 3, 0,            /* 0x4d */
 611                 {{0, 0},
 612                 {2, 3},
 613                 {6, 6},
 614                 {0, 0}
 615                 }
 616         },
 617         {0, 0, 2, 0,            /* 0x4e */
 618                 {{1, 3},
 619                 {6, 6},
 620                 {0, 0},
 621                 {0, 0}
 622                 }
 623         },
 624         {1, 0, 2, 0,            /* 0x4f */
 625                 {{0, 3},
 626                 {6, 6},
 627                 {0, 0},
 628                 {0, 0}
 629                 }
 630         },
 631         {0, 0, 2, 0,            /* 0x50 */
 632                 {{4, 4},
 633                 {6, 6},
 634                 {0, 0},
 635                 {0, 0}
 636                 }
 637         },
 638         {1, 0, 3, 0,            /* 0x51 */
 639                 {{0, 0},
 640                 {4, 4},
 641                 {6, 6},
 642                 {0, 0}
 643                 }
 644         },
 645         {0, 0, 3, 0,            /* 0x52 */
 646                 {{1, 1},
 647                 {4, 4},
 648                 {6, 6},
 649                 {0, 0}
 650                 }
 651         },
 652         {1, 0, 3, 0,            /* 0x53 */
 653                 {{0, 1},
 654                 {4, 4},
 655                 {6, 6},
 656                 {0, 0}
 657                 }
 658         },
 659         {0, 0, 3, 0,            /* 0x54 */
 660                 {{2, 2},
 661                 {4, 4},
 662                 {6, 6},
 663                 {0, 0}
 664                 }
 665         },
 666         {1, 0, 4, 0,            /* 0x55 */
 667                 {{0, 0},
 668                 {2, 2},
 669                 {4, 4},
 670                 {6, 6}
 671                 }
 672         },
 673         {0, 0, 3, 0,            /* 0x56 */
 674                 {{1, 2},
 675                 {4, 4},
 676                 {6, 6},
 677                 {0, 0}
 678                 }
 679         },
 680         {1, 0, 3, 0,            /* 0x57 */
 681                 {{0, 2},
 682                 {4, 4},
 683                 {6, 6},
 684                 {0, 0}
 685                 }
 686         },
 687         {0, 0, 2, 0,            /* 0x58 */
 688                 {{3, 4},
 689                 {6, 6},
 690                 {0, 0},
 691                 {0, 0}
 692                 }
 693         },
 694         {1, 0, 3, 0,            /* 0x59 */
 695                 {{0, 0},
 696                 {3, 4},
 697                 {6, 6},
 698                 {0, 0}
 699                 }
 700         },
 701         {0, 0, 3, 0,            /* 0x5a */
 702                 {{1, 1},
 703                 {3, 4},
 704                 {6, 6},
 705                 {0, 0}
 706                 }
 707         },
 708         {1, 0, 3, 0,            /* 0x5b */
 709                 {{0, 1},
 710                 {3, 4},
 711                 {6, 6},
 712                 {0, 0}
 713                 }
 714         },
 715         {0, 0, 2, 0,            /* 0x5c */
 716                 {{2, 4},
 717                 {6, 6},
 718                 {0, 0},
 719                 {0, 0}
 720                 }
 721         },
 722         {1, 0, 3, 0,            /* 0x5d */
 723                 {{0, 0},
 724                 {2, 4},
 725                 {6, 6},
 726                 {0, 0}
 727                 }
 728         },
 729         {0, 0, 2, 0,            /* 0x5e */
 730                 {{1, 4},
 731                 {6, 6},
 732                 {0, 0},
 733                 {0, 0}
 734                 }
 735         },
 736         {1, 0, 2, 0,            /* 0x5f */
 737                 {{0, 4},
 738                 {6, 6},
 739                 {0, 0},
 740                 {0, 0}
 741                 }
 742         },
 743         {0, 0, 1, 0,            /* 0x60 */
 744                 {{5, 6},
 745                 {0, 0},
 746                 {0, 0},
 747                 {0, 0}
 748                 }
 749         },
 750         {1, 0, 2, 0,            /* 0x61 */
 751                 {{0, 0},
 752                 {5, 6},
 753                 {0, 0},
 754                 {0, 0}
 755                 }
 756         },
 757         {0, 0, 2, 0,            /* 0x62 */
 758                 {{1, 1},
 759                 {5, 6},
 760                 {0, 0},
 761                 {0, 0}
 762                 }
 763         },
 764         {1, 0, 2, 0,            /* 0x63 */
 765                 {{0, 1},
 766                 {5, 6},
 767                 {0, 0},
 768                 {0, 0}
 769                 }
 770         },
 771         {0, 0, 2, 0,            /* 0x64 */
 772                 {{2, 2},
 773                 {5, 6},
 774                 {0, 0},
 775                 {0, 0}
 776                 }
 777         },
 778         {1, 0, 3, 0,            /* 0x65 */
 779                 {{0, 0},
 780                 {2, 2},
 781                 {5, 6},
 782                 {0, 0}
 783                 }
 784         },
 785         {0, 0, 2, 0,            /* 0x66 */
 786                 {{1, 2},
 787                 {5, 6},
 788                 {0, 0},
 789                 {0, 0}
 790                 }
 791         },
 792         {1, 0, 2, 0,            /* 0x67 */
 793                 {{0, 2},
 794                 {5, 6},
 795                 {0, 0},
 796                 {0, 0}
 797                 }
 798         },
 799         {0, 0, 2, 0,            /* 0x68 */
 800                 {{3, 3},
 801                 {5, 6},
 802                 {0, 0},
 803                 {0, 0}
 804                 }
 805         },
 806         {1, 0, 3, 0,            /* 0x69 */
 807                 {{0, 0},
 808                 {3, 3},
 809                 {5, 6},
 810                 {0, 0}
 811                 }
 812         },
 813         {0, 0, 3, 0,            /* 0x6a */
 814                 {{1, 1},
 815                 {3, 3},
 816                 {5, 6},
 817                 {0, 0}
 818                 }
 819         },
 820         {1, 0, 3, 0,            /* 0x6b */
 821                 {{0, 1},
 822                 {3, 3},
 823                 {5, 6},
 824                 {0, 0}
 825                 }
 826         },
 827         {0, 0, 2, 0,            /* 0x6c */
 828                 {{2, 3},
 829                 {5, 6},
 830                 {0, 0},
 831                 {0, 0}
 832                 }
 833         },
 834         {1, 0, 3, 0,            /* 0x6d */
 835                 {{0, 0},
 836                 {2, 3},
 837                 {5, 6},
 838                 {0, 0}
 839                 }
 840         },
 841         {0, 0, 2, 0,            /* 0x6e */
 842                 {{1, 3},
 843                 {5, 6},
 844                 {0, 0},
 845                 {0, 0}
 846                 }
 847         },
 848         {1, 0, 2, 0,            /* 0x6f */
 849                 {{0, 3},
 850                 {5, 6},
 851                 {0, 0},
 852                 {0, 0}
 853                 }
 854         },
 855         {0, 0, 1, 0,            /* 0x70 */
 856                 {{4, 6},
 857                 {0, 0},
 858                 {0, 0},
 859                 {0, 0}
 860                 }
 861         },
 862         {1, 0, 2, 0,            /* 0x71 */
 863                 {{0, 0},
 864                 {4, 6},
 865                 {0, 0},
 866                 {0, 0}
 867                 }
 868         },
 869         {0, 0, 2, 0,            /* 0x72 */
 870                 {{1, 1},
 871                 {4, 6},
 872                 {0, 0},
 873                 {0, 0}
 874                 }
 875         },
 876         {1, 0, 2, 0,            /* 0x73 */
 877                 {{0, 1},
 878                 {4, 6},
 879                 {0, 0},
 880                 {0, 0}
 881                 }
 882         },
 883         {0, 0, 2, 0,            /* 0x74 */
 884                 {{2, 2},
 885                 {4, 6},
 886                 {0, 0},
 887                 {0, 0}
 888                 }
 889         },
 890         {1, 0, 3, 0,            /* 0x75 */
 891                 {{0, 0},
 892                 {2, 2},
 893                 {4, 6},
 894                 {0, 0}
 895                 }
 896         },
 897         {0, 0, 2, 0,            /* 0x76 */
 898                 {{1, 2},
 899                 {4, 6},
 900                 {0, 0},
 901                 {0, 0}
 902                 }
 903         },
 904         {1, 0, 2, 0,            /* 0x77 */
 905                 {{0, 2},
 906                 {4, 6},
 907                 {0, 0},
 908                 {0, 0}
 909                 }
 910         },
 911         {0, 0, 1, 0,            /* 0x78 */
 912                 {{3, 6},
 913                 {0, 0},
 914                 {0, 0},
 915                 {0, 0}
 916                 }
 917         },
 918         {1, 0, 2, 0,            /* 0x79 */
 919                 {{0, 0},
 920                 {3, 6},
 921                 {0, 0},
 922                 {0, 0}
 923                 }
 924         },
 925         {0, 0, 2, 0,            /* 0x7a */
 926                 {{1, 1},
 927                 {3, 6},
 928                 {0, 0},
 929                 {0, 0}
 930                 }
 931         },
 932         {1, 0, 2, 0,            /* 0x7b */
 933                 {{0, 1},
 934                 {3, 6},
 935                 {0, 0},
 936                 {0, 0}
 937                 }
 938         },
 939         {0, 0, 1, 0,            /* 0x7c */
 940                 {{2, 6},
 941                 {0, 0},
 942                 {0, 0},
 943                 {0, 0}
 944                 }
 945         },
 946         {1, 0, 2, 0,            /* 0x7d */
 947                 {{0, 0},
 948                 {2, 6},
 949                 {0, 0},
 950                 {0, 0}
 951                 }
 952         },
 953         {0, 0, 1, 0,            /* 0x7e */
 954                 {{1, 6},
 955                 {0, 0},
 956                 {0, 0},
 957                 {0, 0}
 958                 }
 959         },
 960         {1, 0, 1, 0,            /* 0x7f */
 961                 {{0, 6},
 962                 {0, 0},
 963                 {0, 0},
 964                 {0, 0}
 965                 }
 966         },
 967         {0, 1, 1, 0,            /* 0x80 */
 968                 {{7, 7},
 969                 {0, 0},
 970                 {0, 0},
 971                 {0, 0}
 972                 }
 973         },
 974         {1, 1, 2, 0,            /* 0x81 */
 975                 {{0, 0},
 976                 {7, 7},
 977                 {0, 0},
 978                 {0, 0}
 979                 }
 980         },
 981         {0, 1, 2, 0,            /* 0x82 */
 982                 {{1, 1},
 983                 {7, 7},
 984                 {0, 0},
 985                 {0, 0}
 986                 }
 987         },
 988         {1, 1, 2, 0,            /* 0x83 */
 989                 {{0, 1},
 990                 {7, 7},
 991                 {0, 0},
 992                 {0, 0}
 993                 }
 994         },
 995         {0, 1, 2, 0,            /* 0x84 */
 996                 {{2, 2},
 997                 {7, 7},
 998                 {0, 0},
 999                 {0, 0}
1000                 }
1001         },
1002         {1, 1, 3, 0,            /* 0x85 */
1003                 {{0, 0},
1004                 {2, 2},
1005                 {7, 7},
1006                 {0, 0}
1007                 }
1008         },
1009         {0, 1, 2, 0,            /* 0x86 */
1010                 {{1, 2},
1011                 {7, 7},
1012                 {0, 0},
1013                 {0, 0}
1014                 }
1015         },
1016         {1, 1, 2, 0,            /* 0x87 */
1017                 {{0, 2},
1018                 {7, 7},
1019                 {0, 0},
1020                 {0, 0}
1021                 }
1022         },
1023         {0, 1, 2, 0,            /* 0x88 */
1024                 {{3, 3},
1025                 {7, 7},
1026                 {0, 0},
1027                 {0, 0}
1028                 }
1029         },
1030         {1, 1, 3, 0,            /* 0x89 */
1031                 {{0, 0},
1032                 {3, 3},
1033                 {7, 7},
1034                 {0, 0}
1035                 }
1036         },
1037         {0, 1, 3, 0,            /* 0x8a */
1038                 {{1, 1},
1039                 {3, 3},
1040                 {7, 7},
1041                 {0, 0}
1042                 }
1043         },
1044         {1, 1, 3, 0,            /* 0x8b */
1045                 {{0, 1},
1046                 {3, 3},
1047                 {7, 7},
1048                 {0, 0}
1049                 }
1050         },
1051         {0, 1, 2, 0,            /* 0x8c */
1052                 {{2, 3},
1053                 {7, 7},
1054                 {0, 0},
1055                 {0, 0}
1056                 }
1057         },
1058         {1, 1, 3, 0,            /* 0x8d */
1059                 {{0, 0},
1060                 {2, 3},
1061                 {7, 7},
1062                 {0, 0}
1063                 }
1064         },
1065         {0, 1, 2, 0,            /* 0x8e */
1066                 {{1, 3},
1067                 {7, 7},
1068                 {0, 0},
1069                 {0, 0}
1070                 }
1071         },
1072         {1, 1, 2, 0,            /* 0x8f */
1073                 {{0, 3},
1074                 {7, 7},
1075                 {0, 0},
1076                 {0, 0}
1077                 }
1078         },
1079         {0, 1, 2, 0,            /* 0x90 */
1080                 {{4, 4},
1081                 {7, 7},
1082                 {0, 0},
1083                 {0, 0}
1084                 }
1085         },
1086         {1, 1, 3, 0,            /* 0x91 */
1087                 {{0, 0},
1088                 {4, 4},
1089                 {7, 7},
1090                 {0, 0}
1091                 }
1092         },
1093         {0, 1, 3, 0,            /* 0x92 */
1094                 {{1, 1},
1095                 {4, 4},
1096                 {7, 7},
1097                 {0, 0}
1098                 }
1099         },
1100         {1, 1, 3, 0,            /* 0x93 */
1101                 {{0, 1},
1102                 {4, 4},
1103                 {7, 7},
1104                 {0, 0}
1105                 }
1106         },
1107         {0, 1, 3, 0,            /* 0x94 */
1108                 {{2, 2},
1109                 {4, 4},
1110                 {7, 7},
1111                 {0, 0}
1112                 }
1113         },
1114         {1, 1, 4, 0,            /* 0x95 */
1115                 {{0, 0},
1116                 {2, 2},
1117                 {4, 4},
1118                 {7, 7}
1119                 }
1120         },
1121         {0, 1, 3, 0,            /* 0x96 */
1122                 {{1, 2},
1123                 {4, 4},
1124                 {7, 7},
1125                 {0, 0}
1126                 }
1127         },
1128         {1, 1, 3, 0,            /* 0x97 */
1129                 {{0, 2},
1130                 {4, 4},
1131                 {7, 7},
1132                 {0, 0}
1133                 }
1134         },
1135         {0, 1, 2, 0,            /* 0x98 */
1136                 {{3, 4},
1137                 {7, 7},
1138                 {0, 0},
1139                 {0, 0}
1140                 }
1141         },
1142         {1, 1, 3, 0,            /* 0x99 */
1143                 {{0, 0},
1144                 {3, 4},
1145                 {7, 7},
1146                 {0, 0}
1147                 }
1148         },
1149         {0, 1, 3, 0,            /* 0x9a */
1150                 {{1, 1},
1151                 {3, 4},
1152                 {7, 7},
1153                 {0, 0}
1154                 }
1155         },
1156         {1, 1, 3, 0,            /* 0x9b */
1157                 {{0, 1},
1158                 {3, 4},
1159                 {7, 7},
1160                 {0, 0}
1161                 }
1162         },
1163         {0, 1, 2, 0,            /* 0x9c */
1164                 {{2, 4},
1165                 {7, 7},
1166                 {0, 0},
1167                 {0, 0}
1168                 }
1169         },
1170         {1, 1, 3, 0,            /* 0x9d */
1171                 {{0, 0},
1172                 {2, 4},
1173                 {7, 7},
1174                 {0, 0}
1175                 }
1176         },
1177         {0, 1, 2, 0,            /* 0x9e */
1178                 {{1, 4},
1179                 {7, 7},
1180                 {0, 0},
1181                 {0, 0}
1182                 }
1183         },
1184         {1, 1, 2, 0,            /* 0x9f */
1185                 {{0, 4},
1186                 {7, 7},
1187                 {0, 0},
1188                 {0, 0}
1189                 }
1190         },
1191         {0, 1, 2, 0,            /* 0xa0 */
1192                 {{5, 5},
1193                 {7, 7},
1194                 {0, 0},
1195                 {0, 0}
1196                 }
1197         },
1198         {1, 1, 3, 0,            /* 0xa1 */
1199                 {{0, 0},
1200                 {5, 5},
1201                 {7, 7},
1202                 {0, 0}
1203                 }
1204         },
1205         {0, 1, 3, 0,            /* 0xa2 */
1206                 {{1, 1},
1207                 {5, 5},
1208                 {7, 7},
1209                 {0, 0}
1210                 }
1211         },
1212         {1, 1, 3, 0,            /* 0xa3 */
1213                 {{0, 1},
1214                 {5, 5},
1215                 {7, 7},
1216                 {0, 0}
1217                 }
1218         },
1219         {0, 1, 3, 0,            /* 0xa4 */
1220                 {{2, 2},
1221                 {5, 5},
1222                 {7, 7},
1223                 {0, 0}
1224                 }
1225         },
1226         {1, 1, 4, 0,            /* 0xa5 */
1227                 {{0, 0},
1228                 {2, 2},
1229                 {5, 5},
1230                 {7, 7}
1231                 }
1232         },
1233         {0, 1, 3, 0,            /* 0xa6 */
1234                 {{1, 2},
1235                 {5, 5},
1236                 {7, 7},
1237                 {0, 0}
1238                 }
1239         },
1240         {1, 1, 3, 0,            /* 0xa7 */
1241                 {{0, 2},
1242                 {5, 5},
1243                 {7, 7},
1244                 {0, 0}
1245                 }
1246         },
1247         {0, 1, 3, 0,            /* 0xa8 */
1248                 {{3, 3},
1249                 {5, 5},
1250                 {7, 7},
1251                 {0, 0}
1252                 }
1253         },
1254         {1, 1, 4, 0,            /* 0xa9 */
1255                 {{0, 0},
1256                 {3, 3},
1257                 {5, 5},
1258                 {7, 7}
1259                 }
1260         },
1261         {0, 1, 4, 0,            /* 0xaa */
1262                 {{1, 1},
1263                 {3, 3},
1264                 {5, 5},
1265                 {7, 7}
1266                 }
1267         },
1268         {1, 1, 4, 0,            /* 0xab */
1269                 {{0, 1},
1270                 {3, 3},
1271                 {5, 5},
1272                 {7, 7}
1273                 }
1274         },
1275         {0, 1, 3, 0,            /* 0xac */
1276                 {{2, 3},
1277                 {5, 5},
1278                 {7, 7},
1279                 {0, 0}
1280                 }
1281         },
1282         {1, 1, 4, 0,            /* 0xad */
1283                 {{0, 0},
1284                 {2, 3},
1285                 {5, 5},
1286                 {7, 7}
1287                 }
1288         },
1289         {0, 1, 3, 0,            /* 0xae */
1290                 {{1, 3},
1291                 {5, 5},
1292                 {7, 7},
1293                 {0, 0}
1294                 }
1295         },
1296         {1, 1, 3, 0,            /* 0xaf */
1297                 {{0, 3},
1298                 {5, 5},
1299                 {7, 7},
1300                 {0, 0}
1301                 }
1302         },
1303         {0, 1, 2, 0,            /* 0xb0 */
1304                 {{4, 5},
1305                 {7, 7},
1306                 {0, 0},
1307                 {0, 0}
1308                 }
1309         },
1310         {1, 1, 3, 0,            /* 0xb1 */
1311                 {{0, 0},
1312                 {4, 5},
1313                 {7, 7},
1314                 {0, 0}
1315                 }
1316         },
1317         {0, 1, 3, 0,            /* 0xb2 */
1318                 {{1, 1},
1319                 {4, 5},
1320                 {7, 7},
1321                 {0, 0}
1322                 }
1323         },
1324         {1, 1, 3, 0,            /* 0xb3 */
1325                 {{0, 1},
1326                 {4, 5},
1327                 {7, 7},
1328                 {0, 0}
1329                 }
1330         },
1331         {0, 1, 3, 0,            /* 0xb4 */
1332                 {{2, 2},
1333                 {4, 5},
1334                 {7, 7},
1335                 {0, 0}
1336                 }
1337         },
1338         {1, 1, 4, 0,            /* 0xb5 */
1339                 {{0, 0},
1340                 {2, 2},
1341                 {4, 5},
1342                 {7, 7}
1343                 }
1344         },
1345         {0, 1, 3, 0,            /* 0xb6 */
1346                 {{1, 2},
1347                 {4, 5},
1348                 {7, 7},
1349                 {0, 0}
1350                 }
1351         },
1352         {1, 1, 3, 0,            /* 0xb7 */
1353                 {{0, 2},
1354                 {4, 5},
1355                 {7, 7},
1356                 {0, 0}
1357                 }
1358         },
1359         {0, 1, 2, 0,            /* 0xb8 */
1360                 {{3, 5},
1361                 {7, 7},
1362                 {0, 0},
1363                 {0, 0}
1364                 }
1365         },
1366         {1, 1, 3, 0,            /* 0xb9 */
1367                 {{0, 0},
1368                 {3, 5},
1369                 {7, 7},
1370                 {0, 0}
1371                 }
1372         },
1373         {0, 1, 3, 0,            /* 0xba */
1374                 {{1, 1},
1375                 {3, 5},
1376                 {7, 7},
1377                 {0, 0}
1378                 }
1379         },
1380         {1, 1, 3, 0,            /* 0xbb */
1381                 {{0, 1},
1382                 {3, 5},
1383                 {7, 7},
1384                 {0, 0}
1385                 }
1386         },
1387         {0, 1, 2, 0,            /* 0xbc */
1388                 {{2, 5},
1389                 {7, 7},
1390                 {0, 0},
1391                 {0, 0}
1392                 }
1393         },
1394         {1, 1, 3, 0,            /* 0xbd */
1395                 {{0, 0},
1396                 {2, 5},
1397                 {7, 7},
1398                 {0, 0}
1399                 }
1400         },
1401         {0, 1, 2, 0,            /* 0xbe */
1402                 {{1, 5},
1403                 {7, 7},
1404                 {0, 0},
1405                 {0, 0}
1406                 }
1407         },
1408         {1, 1, 2, 0,            /* 0xbf */
1409                 {{0, 5},
1410                 {7, 7},
1411                 {0, 0},
1412                 {0, 0}
1413                 }
1414         },
1415         {0, 1, 1, 0,            /* 0xc0 */
1416                 {{6, 7},
1417                 {0, 0},
1418                 {0, 0},
1419                 {0, 0}
1420                 }
1421         },
1422         {1, 1, 2, 0,            /* 0xc1 */
1423                 {{0, 0},
1424                 {6, 7},
1425                 {0, 0},
1426                 {0, 0}
1427                 }
1428         },
1429         {0, 1, 2, 0,            /* 0xc2 */
1430                 {{1, 1},
1431                 {6, 7},
1432                 {0, 0},
1433                 {0, 0}
1434                 }
1435         },
1436         {1, 1, 2, 0,            /* 0xc3 */
1437                 {{0, 1},
1438                 {6, 7},
1439                 {0, 0},
1440                 {0, 0}
1441                 }
1442         },
1443         {0, 1, 2, 0,            /* 0xc4 */
1444                 {{2, 2},
1445                 {6, 7},
1446                 {0, 0},
1447                 {0, 0}
1448                 }
1449         },
1450         {1, 1, 3, 0,            /* 0xc5 */
1451                 {{0, 0},
1452                 {2, 2},
1453                 {6, 7},
1454                 {0, 0}
1455                 }
1456         },
1457         {0, 1, 2, 0,            /* 0xc6 */
1458                 {{1, 2},
1459                 {6, 7},
1460                 {0, 0},
1461                 {0, 0}
1462                 }
1463         },
1464         {1, 1, 2, 0,            /* 0xc7 */
1465                 {{0, 2},
1466                 {6, 7},
1467                 {0, 0},
1468                 {0, 0}
1469                 }
1470         },
1471         {0, 1, 2, 0,            /* 0xc8 */
1472                 {{3, 3},
1473                 {6, 7},
1474                 {0, 0},
1475                 {0, 0}
1476                 }
1477         },
1478         {1, 1, 3, 0,            /* 0xc9 */
1479                 {{0, 0},
1480                 {3, 3},
1481                 {6, 7},
1482                 {0, 0}
1483                 }
1484         },
1485         {0, 1, 3, 0,            /* 0xca */
1486                 {{1, 1},
1487                 {3, 3},
1488                 {6, 7},
1489                 {0, 0}
1490                 }
1491         },
1492         {1, 1, 3, 0,            /* 0xcb */
1493                 {{0, 1},
1494                 {3, 3},
1495                 {6, 7},
1496                 {0, 0}
1497                 }
1498         },
1499         {0, 1, 2, 0,            /* 0xcc */
1500                 {{2, 3},
1501                 {6, 7},
1502                 {0, 0},
1503                 {0, 0}
1504                 }
1505         },
1506         {1, 1, 3, 0,            /* 0xcd */
1507                 {{0, 0},
1508                 {2, 3},
1509                 {6, 7},
1510                 {0, 0}
1511                 }
1512         },
1513         {0, 1, 2, 0,            /* 0xce */
1514                 {{1, 3},
1515                 {6, 7},
1516                 {0, 0},
1517                 {0, 0}
1518                 }
1519         },
1520         {1, 1, 2, 0,            /* 0xcf */
1521                 {{0, 3},
1522                 {6, 7},
1523                 {0, 0},
1524                 {0, 0}
1525                 }
1526         },
1527         {0, 1, 2, 0,            /* 0xd0 */
1528                 {{4, 4},
1529                 {6, 7},
1530                 {0, 0},
1531                 {0, 0}
1532                 }
1533         },
1534         {1, 1, 3, 0,            /* 0xd1 */
1535                 {{0, 0},
1536                 {4, 4},
1537                 {6, 7},
1538                 {0, 0}
1539                 }
1540         },
1541         {0, 1, 3, 0,            /* 0xd2 */
1542                 {{1, 1},
1543                 {4, 4},
1544                 {6, 7},
1545                 {0, 0}
1546                 }
1547         },
1548         {1, 1, 3, 0,            /* 0xd3 */
1549                 {{0, 1},
1550                 {4, 4},
1551                 {6, 7},
1552                 {0, 0}
1553                 }
1554         },
1555         {0, 1, 3, 0,            /* 0xd4 */
1556                 {{2, 2},
1557                 {4, 4},
1558                 {6, 7},
1559                 {0, 0}
1560                 }
1561         },
1562         {1, 1, 4, 0,            /* 0xd5 */
1563                 {{0, 0},
1564                 {2, 2},
1565                 {4, 4},
1566                 {6, 7}
1567                 }
1568         },
1569         {0, 1, 3, 0,            /* 0xd6 */
1570                 {{1, 2},
1571                 {4, 4},
1572                 {6, 7},
1573                 {0, 0}
1574                 }
1575         },
1576         {1, 1, 3, 0,            /* 0xd7 */
1577                 {{0, 2},
1578                 {4, 4},
1579                 {6, 7},
1580                 {0, 0}
1581                 }
1582         },
1583         {0, 1, 2, 0,            /* 0xd8 */
1584                 {{3, 4},
1585                 {6, 7},
1586                 {0, 0},
1587                 {0, 0}
1588                 }
1589         },
1590         {1, 1, 3, 0,            /* 0xd9 */
1591                 {{0, 0},
1592                 {3, 4},
1593                 {6, 7},
1594                 {0, 0}
1595                 }
1596         },
1597         {0, 1, 3, 0,            /* 0xda */
1598                 {{1, 1},
1599                 {3, 4},
1600                 {6, 7},
1601                 {0, 0}
1602                 }
1603         },
1604         {1, 1, 3, 0,            /* 0xdb */
1605                 {{0, 1},
1606                 {3, 4},
1607                 {6, 7},
1608                 {0, 0}
1609                 }
1610         },
1611         {0, 1, 2, 0,            /* 0xdc */
1612                 {{2, 4},
1613                 {6, 7},
1614                 {0, 0},
1615                 {0, 0}
1616                 }
1617         },
1618         {1, 1, 3, 0,            /* 0xdd */
1619                 {{0, 0},
1620                 {2, 4},
1621                 {6, 7},
1622                 {0, 0}
1623                 }
1624         },
1625         {0, 1, 2, 0,            /* 0xde */
1626                 {{1, 4},
1627                 {6, 7},
1628                 {0, 0},
1629                 {0, 0}
1630                 }
1631         },
1632         {1, 1, 2, 0,            /* 0xdf */
1633                 {{0, 4},
1634                 {6, 7},
1635                 {0, 0},
1636                 {0, 0}
1637                 }
1638         },
1639         {0, 1, 1, 0,            /* 0xe0 */
1640                 {{5, 7},
1641                 {0, 0},
1642                 {0, 0},
1643                 {0, 0}
1644                 }
1645         },
1646         {1, 1, 2, 0,            /* 0xe1 */
1647                 {{0, 0},
1648                 {5, 7},
1649                 {0, 0},
1650                 {0, 0}
1651                 }
1652         },
1653         {0, 1, 2, 0,            /* 0xe2 */
1654                 {{1, 1},
1655                 {5, 7},
1656                 {0, 0},
1657                 {0, 0}
1658                 }
1659         },
1660         {1, 1, 2, 0,            /* 0xe3 */
1661                 {{0, 1},
1662                 {5, 7},
1663                 {0, 0},
1664                 {0, 0}
1665                 }
1666         },
1667         {0, 1, 2, 0,            /* 0xe4 */
1668                 {{2, 2},
1669                 {5, 7},
1670                 {0, 0},
1671                 {0, 0}
1672                 }
1673         },
1674         {1, 1, 3, 0,            /* 0xe5 */
1675                 {{0, 0},
1676                 {2, 2},
1677                 {5, 7},
1678                 {0, 0}
1679                 }
1680         },
1681         {0, 1, 2, 0,            /* 0xe6 */
1682                 {{1, 2},
1683                 {5, 7},
1684                 {0, 0},
1685                 {0, 0}
1686                 }
1687         },
1688         {1, 1, 2, 0,            /* 0xe7 */
1689                 {{0, 2},
1690                 {5, 7},
1691                 {0, 0},
1692                 {0, 0}
1693                 }
1694         },
1695         {0, 1, 2, 0,            /* 0xe8 */
1696                 {{3, 3},
1697                 {5, 7},
1698                 {0, 0},
1699                 {0, 0}
1700                 }
1701         },
1702         {1, 1, 3, 0,            /* 0xe9 */
1703                 {{0, 0},
1704                 {3, 3},
1705                 {5, 7},
1706                 {0, 0}
1707                 }
1708         },
1709         {0, 1, 3, 0,            /* 0xea */
1710                 {{1, 1},
1711                 {3, 3},
1712                 {5, 7},
1713                 {0, 0}
1714                 }
1715         },
1716         {1, 1, 3, 0,            /* 0xeb */
1717                 {{0, 1},
1718                 {3, 3},
1719                 {5, 7},
1720                 {0, 0}
1721                 }
1722         },
1723         {0, 1, 2, 0,            /* 0xec */
1724                 {{2, 3},
1725                 {5, 7},
1726                 {0, 0},
1727                 {0, 0}
1728                 }
1729         },
1730         {1, 1, 3, 0,            /* 0xed */
1731                 {{0, 0},
1732                 {2, 3},
1733                 {5, 7},
1734                 {0, 0}
1735                 }
1736         },
1737         {0, 1, 2, 0,            /* 0xee */
1738                 {{1, 3},
1739                 {5, 7},
1740                 {0, 0},
1741                 {0, 0}
1742                 }
1743         },
1744         {1, 1, 2, 0,            /* 0xef */
1745                 {{0, 3},
1746                 {5, 7},
1747                 {0, 0},
1748                 {0, 0}
1749                 }
1750         },
1751         {0, 1, 1, 0,            /* 0xf0 */
1752                 {{4, 7},
1753                 {0, 0},
1754                 {0, 0},
1755                 {0, 0}
1756                 }
1757         },
1758         {1, 1, 2, 0,            /* 0xf1 */
1759                 {{0, 0},
1760                 {4, 7},
1761                 {0, 0},
1762                 {0, 0}
1763                 }
1764         },
1765         {0, 1, 2, 0,            /* 0xf2 */
1766                 {{1, 1},
1767                 {4, 7},
1768                 {0, 0},
1769                 {0, 0}
1770                 }
1771         },
1772         {1, 1, 2, 0,            /* 0xf3 */
1773                 {{0, 1},
1774                 {4, 7},
1775                 {0, 0},
1776                 {0, 0}
1777                 }
1778         },
1779         {0, 1, 2, 0,            /* 0xf4 */
1780                 {{2, 2},
1781                 {4, 7},
1782                 {0, 0},
1783                 {0, 0}
1784                 }
1785         },
1786         {1, 1, 3, 0,            /* 0xf5 */
1787                 {{0, 0},
1788                 {2, 2},
1789                 {4, 7},
1790                 {0, 0}
1791                 }
1792         },
1793         {0, 1, 2, 0,            /* 0xf6 */
1794                 {{1, 2},
1795                 {4, 7},
1796                 {0, 0},
1797                 {0, 0}
1798                 }
1799         },
1800         {1, 1, 2, 0,            /* 0xf7 */
1801                 {{0, 2},
1802                 {4, 7},
1803                 {0, 0},
1804                 {0, 0}
1805                 }
1806         },
1807         {0, 1, 1, 0,            /* 0xf8 */
1808                 {{3, 7},
1809                 {0, 0},
1810                 {0, 0},
1811                 {0, 0}
1812                 }
1813         },
1814         {1, 1, 2, 0,            /* 0xf9 */
1815                 {{0, 0},
1816                 {3, 7},
1817                 {0, 0},
1818                 {0, 0}
1819                 }
1820         },
1821         {0, 1, 2, 0,            /* 0xfa */
1822                 {{1, 1},
1823                 {3, 7},
1824                 {0, 0},
1825                 {0, 0}
1826                 }
1827         },
1828         {1, 1, 2, 0,            /* 0xfb */
1829                 {{0, 1},
1830                 {3, 7},
1831                 {0, 0},
1832                 {0, 0}
1833                 }
1834         },
1835         {0, 1, 1, 0,            /* 0xfc */
1836                 {{2, 7},
1837                 {0, 0},
1838                 {0, 0},
1839                 {0, 0}
1840                 }
1841         },
1842         {1, 1, 2, 0,            /* 0xfd */
1843                 {{0, 0},
1844                 {2, 7},
1845                 {0, 0},
1846                 {0, 0}
1847                 }
1848         },
1849         {0, 1, 1, 0,            /* 0xfe */
1850                 {{1, 7},
1851                 {0, 0},
1852                 {0, 0},
1853                 {0, 0}
1854                 }
1855         },
1856         {1, 1, 1, 0,            /* 0xff */
1857                 {{0, 7},
1858                 {0, 0},
1859                 {0, 0},
1860                 {0, 0}
1861                 }
1862         }
1863 };
1864
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *parmh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946
1947 #endif
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963 #if defined(INET) || defined(INET6)
1964         if (M_TRAILINGSPACE(m) >= plen) {
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(plen, 0, M_NOWAIT, 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 = &ifa->address.sin;
1991                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1992                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1993                         parmh->param_length = htons(plen);
1994                         ipv4p->addr = sin->sin_addr.s_addr;
1995                         SCTP_BUF_LEN(mret) += plen;
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 = &ifa->address.sin6;
2006                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2007                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2008                         parmh->param_length = htons(plen);
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) += plen;
2014                         break;
2015                 }
2016 #endif
2017         default:
2018                 return (m);
2019         }
2020         if (len != NULL) {
2021                 *len += plen;
2022         }
2023         return (mret);
2024 #endif
2025 }
2026
2027
2028 struct mbuf *
2029 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2030     struct sctp_scoping *scope,
2031     struct mbuf *m_at, int cnt_inits_to,
2032     uint16_t * padding_len, uint16_t * chunk_len)
2033 {
2034         struct sctp_vrf *vrf = NULL;
2035         int cnt, limit_out = 0, total_count;
2036         uint32_t vrf_id;
2037
2038         vrf_id = inp->def_vrf_id;
2039         SCTP_IPI_ADDR_RLOCK();
2040         vrf = sctp_find_vrf(vrf_id);
2041         if (vrf == NULL) {
2042                 SCTP_IPI_ADDR_RUNLOCK();
2043                 return (m_at);
2044         }
2045         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2046                 struct sctp_ifa *sctp_ifap;
2047                 struct sctp_ifn *sctp_ifnp;
2048
2049                 cnt = cnt_inits_to;
2050                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2051                         limit_out = 1;
2052                         cnt = SCTP_ADDRESS_LIMIT;
2053                         goto skip_count;
2054                 }
2055                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2056                         if ((scope->loopback_scope == 0) &&
2057                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2058                                 /*
2059                                  * Skip loopback devices if loopback_scope
2060                                  * not set
2061                                  */
2062                                 continue;
2063                         }
2064                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2065 #ifdef INET
2066                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2067                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2068                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2069                                         continue;
2070                                 }
2071 #endif
2072 #ifdef INET6
2073                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2074                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2075                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2076                                         continue;
2077                                 }
2078 #endif
2079                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2080                                         continue;
2081                                 }
2082                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2083                                         continue;
2084                                 }
2085                                 cnt++;
2086                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2087                                         break;
2088                                 }
2089                         }
2090                         if (cnt > SCTP_ADDRESS_LIMIT) {
2091                                 break;
2092                         }
2093                 }
2094 skip_count:
2095                 if (cnt > 1) {
2096                         total_count = 0;
2097                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2098                                 cnt = 0;
2099                                 if ((scope->loopback_scope == 0) &&
2100                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2101                                         /*
2102                                          * Skip loopback devices if
2103                                          * loopback_scope not set
2104                                          */
2105                                         continue;
2106                                 }
2107                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2108 #ifdef INET
2109                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2110                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2111                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2112                                                 continue;
2113                                         }
2114 #endif
2115 #ifdef INET6
2116                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2117                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2118                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2119                                                 continue;
2120                                         }
2121 #endif
2122                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2123                                                 continue;
2124                                         }
2125                                         if (sctp_is_address_in_scope(sctp_ifap,
2126                                             scope, 0) == 0) {
2127                                                 continue;
2128                                         }
2129                                         if ((chunk_len != NULL) &&
2130                                             (padding_len != NULL) &&
2131                                             (*padding_len > 0)) {
2132                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2133                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2134                                                 *chunk_len += *padding_len;
2135                                                 *padding_len = 0;
2136                                         }
2137                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2138                                         if (limit_out) {
2139                                                 cnt++;
2140                                                 total_count++;
2141                                                 if (cnt >= 2) {
2142                                                         /*
2143                                                          * two from each
2144                                                          * address
2145                                                          */
2146                                                         break;
2147                                                 }
2148                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2149                                                         /* No more addresses */
2150                                                         break;
2151                                                 }
2152                                         }
2153                                 }
2154                         }
2155                 }
2156         } else {
2157                 struct sctp_laddr *laddr;
2158
2159                 cnt = cnt_inits_to;
2160                 /* First, how many ? */
2161                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2162                         if (laddr->ifa == NULL) {
2163                                 continue;
2164                         }
2165                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2166                                 /*
2167                                  * Address being deleted by the system, dont
2168                                  * list.
2169                                  */
2170                                 continue;
2171                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2172                                 /*
2173                                  * Address being deleted on this ep don't
2174                                  * list.
2175                                  */
2176                                 continue;
2177                         }
2178                         if (sctp_is_address_in_scope(laddr->ifa,
2179                             scope, 1) == 0) {
2180                                 continue;
2181                         }
2182                         cnt++;
2183                 }
2184                 /*
2185                  * To get through a NAT we only list addresses if we have
2186                  * more than one. That way if you just bind a single address
2187                  * we let the source of the init dictate our address.
2188                  */
2189                 if (cnt > 1) {
2190                         cnt = cnt_inits_to;
2191                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2192                                 if (laddr->ifa == NULL) {
2193                                         continue;
2194                                 }
2195                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2196                                         continue;
2197                                 }
2198                                 if (sctp_is_address_in_scope(laddr->ifa,
2199                                     scope, 0) == 0) {
2200                                         continue;
2201                                 }
2202                                 if ((chunk_len != NULL) &&
2203                                     (padding_len != NULL) &&
2204                                     (*padding_len > 0)) {
2205                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2206                                         SCTP_BUF_LEN(m_at) += *padding_len;
2207                                         *chunk_len += *padding_len;
2208                                         *padding_len = 0;
2209                                 }
2210                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2211                                 cnt++;
2212                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2213                                         break;
2214                                 }
2215                         }
2216                 }
2217         }
2218         SCTP_IPI_ADDR_RUNLOCK();
2219         return (m_at);
2220 }
2221
2222 static struct sctp_ifa *
2223 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2224     uint8_t dest_is_loop,
2225     uint8_t dest_is_priv,
2226     sa_family_t fam)
2227 {
2228         uint8_t dest_is_global = 0;
2229
2230         /* dest_is_priv is true if destination is a private address */
2231         /* dest_is_loop is true if destination is a loopback addresses */
2232
2233         /**
2234          * Here we determine if its a preferred address. A preferred address
2235          * means it is the same scope or higher scope then the destination.
2236          * L = loopback, P = private, G = global
2237          * -----------------------------------------
2238          *    src    |  dest | result
2239          *  ----------------------------------------
2240          *     L     |    L  |    yes
2241          *  -----------------------------------------
2242          *     P     |    L  |    yes-v4 no-v6
2243          *  -----------------------------------------
2244          *     G     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     L     |    P  |    no
2247          *  -----------------------------------------
2248          *     P     |    P  |    yes
2249          *  -----------------------------------------
2250          *     G     |    P  |    no
2251          *   -----------------------------------------
2252          *     L     |    G  |    no
2253          *   -----------------------------------------
2254          *     P     |    G  |    no
2255          *    -----------------------------------------
2256          *     G     |    G  |    yes
2257          *    -----------------------------------------
2258          */
2259
2260         if (ifa->address.sa.sa_family != fam) {
2261                 /* forget mis-matched family */
2262                 return (NULL);
2263         }
2264         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2265                 dest_is_global = 1;
2266         }
2267         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2268         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2269         /* Ok the address may be ok */
2270 #ifdef INET6
2271         if (fam == AF_INET6) {
2272                 /* ok to use deprecated addresses? no lets not! */
2273                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2274                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2275                         return (NULL);
2276                 }
2277                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2278                         if (dest_is_loop) {
2279                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2280                                 return (NULL);
2281                         }
2282                 }
2283                 if (ifa->src_is_glob) {
2284                         if (dest_is_loop) {
2285                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2286                                 return (NULL);
2287                         }
2288                 }
2289         }
2290 #endif
2291         /*
2292          * Now that we know what is what, implement or table this could in
2293          * theory be done slicker (it used to be), but this is
2294          * straightforward and easier to validate :-)
2295          */
2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2297             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2299             dest_is_loop, dest_is_priv, dest_is_global);
2300
2301         if ((ifa->src_is_loop) && (dest_is_priv)) {
2302                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2303                 return (NULL);
2304         }
2305         if ((ifa->src_is_glob) && (dest_is_priv)) {
2306                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2307                 return (NULL);
2308         }
2309         if ((ifa->src_is_loop) && (dest_is_global)) {
2310                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2311                 return (NULL);
2312         }
2313         if ((ifa->src_is_priv) && (dest_is_global)) {
2314                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2315                 return (NULL);
2316         }
2317         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2318         /* its a preferred address */
2319         return (ifa);
2320 }
2321
2322 static struct sctp_ifa *
2323 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2324     uint8_t dest_is_loop,
2325     uint8_t dest_is_priv,
2326     sa_family_t fam)
2327 {
2328         uint8_t dest_is_global = 0;
2329
2330         /**
2331          * Here we determine if its a acceptable address. A acceptable
2332          * address means it is the same scope or higher scope but we can
2333          * allow for NAT which means its ok to have a global dest and a
2334          * private src.
2335          *
2336          * L = loopback, P = private, G = global
2337          * -----------------------------------------
2338          *  src    |  dest | result
2339          * -----------------------------------------
2340          *   L     |   L   |    yes
2341          *  -----------------------------------------
2342          *   P     |   L   |    yes-v4 no-v6
2343          *  -----------------------------------------
2344          *   G     |   L   |    yes
2345          * -----------------------------------------
2346          *   L     |   P   |    no
2347          * -----------------------------------------
2348          *   P     |   P   |    yes
2349          * -----------------------------------------
2350          *   G     |   P   |    yes - May not work
2351          * -----------------------------------------
2352          *   L     |   G   |    no
2353          * -----------------------------------------
2354          *   P     |   G   |    yes - May not work
2355          * -----------------------------------------
2356          *   G     |   G   |    yes
2357          * -----------------------------------------
2358          */
2359
2360         if (ifa->address.sa.sa_family != fam) {
2361                 /* forget non matching family */
2362                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2363                     ifa->address.sa.sa_family, fam);
2364                 return (NULL);
2365         }
2366         /* Ok the address may be ok */
2367         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2369             dest_is_loop, dest_is_priv);
2370         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2371                 dest_is_global = 1;
2372         }
2373 #ifdef INET6
2374         if (fam == AF_INET6) {
2375                 /* ok to use deprecated addresses? */
2376                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2377                         return (NULL);
2378                 }
2379                 if (ifa->src_is_priv) {
2380                         /* Special case, linklocal to loop */
2381                         if (dest_is_loop)
2382                                 return (NULL);
2383                 }
2384         }
2385 #endif
2386         /*
2387          * Now that we know what is what, implement our table. This could in
2388          * theory be done slicker (it used to be), but this is
2389          * straightforward and easier to validate :-)
2390          */
2391         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2392             ifa->src_is_loop,
2393             dest_is_priv);
2394         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2395                 return (NULL);
2396         }
2397         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2398             ifa->src_is_loop,
2399             dest_is_global);
2400         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2401                 return (NULL);
2402         }
2403         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2404         /* its an acceptable address */
2405         return (ifa);
2406 }
2407
2408 int
2409 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2410 {
2411         struct sctp_laddr *laddr;
2412
2413         if (stcb == NULL) {
2414                 /* There are no restrictions, no TCB :-) */
2415                 return (0);
2416         }
2417         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2418                 if (laddr->ifa == NULL) {
2419                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2420                             __FUNCTION__);
2421                         continue;
2422                 }
2423                 if (laddr->ifa == ifa) {
2424                         /* Yes it is on the list */
2425                         return (1);
2426                 }
2427         }
2428         return (0);
2429 }
2430
2431
2432 int
2433 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2434 {
2435         struct sctp_laddr *laddr;
2436
2437         if (ifa == NULL)
2438                 return (0);
2439         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2440                 if (laddr->ifa == NULL) {
2441                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2442                             __FUNCTION__);
2443                         continue;
2444                 }
2445                 if ((laddr->ifa == ifa) && laddr->action == 0)
2446                         /* same pointer */
2447                         return (1);
2448         }
2449         return (0);
2450 }
2451
2452
2453
2454 static struct sctp_ifa *
2455 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2456     sctp_route_t * ro,
2457     uint32_t vrf_id,
2458     int non_asoc_addr_ok,
2459     uint8_t dest_is_priv,
2460     uint8_t dest_is_loop,
2461     sa_family_t fam)
2462 {
2463         struct sctp_laddr *laddr, *starting_point;
2464         void *ifn;
2465         int resettotop = 0;
2466         struct sctp_ifn *sctp_ifn;
2467         struct sctp_ifa *sctp_ifa, *sifa;
2468         struct sctp_vrf *vrf;
2469         uint32_t ifn_index;
2470
2471         vrf = sctp_find_vrf(vrf_id);
2472         if (vrf == NULL)
2473                 return (NULL);
2474
2475         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2476         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2477         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2478         /*
2479          * first question, is the ifn we will emit on in our list, if so, we
2480          * want such an address. Note that we first looked for a preferred
2481          * address.
2482          */
2483         if (sctp_ifn) {
2484                 /* is a preferred one on the interface we route out? */
2485                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2486 #ifdef INET
2487                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2488                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2489                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2490                                 continue;
2491                         }
2492 #endif
2493 #ifdef INET6
2494                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2495                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2496                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2497                                 continue;
2498                         }
2499 #endif
2500                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2501                             (non_asoc_addr_ok == 0))
2502                                 continue;
2503                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2504                             dest_is_loop,
2505                             dest_is_priv, fam);
2506                         if (sifa == NULL)
2507                                 continue;
2508                         if (sctp_is_addr_in_ep(inp, sifa)) {
2509                                 atomic_add_int(&sifa->refcount, 1);
2510                                 return (sifa);
2511                         }
2512                 }
2513         }
2514         /*
2515          * ok, now we now need to find one on the list of the addresses. We
2516          * can't get one on the emitting interface so let's find first a
2517          * preferred one. If not that an acceptable one otherwise... we
2518          * return NULL.
2519          */
2520         starting_point = inp->next_addr_touse;
2521 once_again:
2522         if (inp->next_addr_touse == NULL) {
2523                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2524                 resettotop = 1;
2525         }
2526         for (laddr = inp->next_addr_touse; laddr;
2527             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2528                 if (laddr->ifa == NULL) {
2529                         /* address has been removed */
2530                         continue;
2531                 }
2532                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2533                         /* address is being deleted */
2534                         continue;
2535                 }
2536                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2537                     dest_is_priv, fam);
2538                 if (sifa == NULL)
2539                         continue;
2540                 atomic_add_int(&sifa->refcount, 1);
2541                 return (sifa);
2542         }
2543         if (resettotop == 0) {
2544                 inp->next_addr_touse = NULL;
2545                 goto once_again;
2546         }
2547         inp->next_addr_touse = starting_point;
2548         resettotop = 0;
2549 once_again_too:
2550         if (inp->next_addr_touse == NULL) {
2551                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552                 resettotop = 1;
2553         }
2554         /* ok, what about an acceptable address in the inp */
2555         for (laddr = inp->next_addr_touse; laddr;
2556             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2557                 if (laddr->ifa == NULL) {
2558                         /* address has been removed */
2559                         continue;
2560                 }
2561                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2562                         /* address is being deleted */
2563                         continue;
2564                 }
2565                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2566                     dest_is_priv, fam);
2567                 if (sifa == NULL)
2568                         continue;
2569                 atomic_add_int(&sifa->refcount, 1);
2570                 return (sifa);
2571         }
2572         if (resettotop == 0) {
2573                 inp->next_addr_touse = NULL;
2574                 goto once_again_too;
2575         }
2576         /*
2577          * no address bound can be a source for the destination we are in
2578          * trouble
2579          */
2580         return (NULL);
2581 }
2582
2583
2584
2585 static struct sctp_ifa *
2586 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2587     struct sctp_tcb *stcb,
2588     sctp_route_t * ro,
2589     uint32_t vrf_id,
2590     uint8_t dest_is_priv,
2591     uint8_t dest_is_loop,
2592     int non_asoc_addr_ok,
2593     sa_family_t fam)
2594 {
2595         struct sctp_laddr *laddr, *starting_point;
2596         void *ifn;
2597         struct sctp_ifn *sctp_ifn;
2598         struct sctp_ifa *sctp_ifa, *sifa;
2599         uint8_t start_at_beginning = 0;
2600         struct sctp_vrf *vrf;
2601         uint32_t ifn_index;
2602
2603         /*
2604          * first question, is the ifn we will emit on in our list, if so, we
2605          * want that one.
2606          */
2607         vrf = sctp_find_vrf(vrf_id);
2608         if (vrf == NULL)
2609                 return (NULL);
2610
2611         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2612         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2613         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2614
2615         /*
2616          * first question, is the ifn we will emit on in our list?  If so,
2617          * we want that one. First we look for a preferred. Second, we go
2618          * for an acceptable.
2619          */
2620         if (sctp_ifn) {
2621                 /* first try for a preferred address on the ep */
2622                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2623 #ifdef INET
2624                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2625                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2626                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2627                                 continue;
2628                         }
2629 #endif
2630 #ifdef INET6
2631                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2632                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2633                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2634                                 continue;
2635                         }
2636 #endif
2637                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2638                                 continue;
2639                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2640                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2641                                 if (sifa == NULL)
2642                                         continue;
2643                                 if (((non_asoc_addr_ok == 0) &&
2644                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2645                                     (non_asoc_addr_ok &&
2646                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2647                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2648                                         /* on the no-no list */
2649                                         continue;
2650                                 }
2651                                 atomic_add_int(&sifa->refcount, 1);
2652                                 return (sifa);
2653                         }
2654                 }
2655                 /* next try for an acceptable address on the ep */
2656                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2657 #ifdef INET
2658                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2659                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2660                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2661                                 continue;
2662                         }
2663 #endif
2664 #ifdef INET6
2665                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2666                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2667                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2668                                 continue;
2669                         }
2670 #endif
2671                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2672                                 continue;
2673                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2674                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2675                                 if (sifa == NULL)
2676                                         continue;
2677                                 if (((non_asoc_addr_ok == 0) &&
2678                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2679                                     (non_asoc_addr_ok &&
2680                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2681                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2682                                         /* on the no-no list */
2683                                         continue;
2684                                 }
2685                                 atomic_add_int(&sifa->refcount, 1);
2686                                 return (sifa);
2687                         }
2688                 }
2689
2690         }
2691         /*
2692          * if we can't find one like that then we must look at all addresses
2693          * bound to pick one at first preferable then secondly acceptable.
2694          */
2695         starting_point = stcb->asoc.last_used_address;
2696 sctp_from_the_top:
2697         if (stcb->asoc.last_used_address == NULL) {
2698                 start_at_beginning = 1;
2699                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2700         }
2701         /* search beginning with the last used address */
2702         for (laddr = stcb->asoc.last_used_address; laddr;
2703             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2704                 if (laddr->ifa == NULL) {
2705                         /* address has been removed */
2706                         continue;
2707                 }
2708                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2709                         /* address is being deleted */
2710                         continue;
2711                 }
2712                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2713                 if (sifa == NULL)
2714                         continue;
2715                 if (((non_asoc_addr_ok == 0) &&
2716                     (sctp_is_addr_restricted(stcb, sifa))) ||
2717                     (non_asoc_addr_ok &&
2718                     (sctp_is_addr_restricted(stcb, sifa)) &&
2719                     (!sctp_is_addr_pending(stcb, sifa)))) {
2720                         /* on the no-no list */
2721                         continue;
2722                 }
2723                 stcb->asoc.last_used_address = laddr;
2724                 atomic_add_int(&sifa->refcount, 1);
2725                 return (sifa);
2726         }
2727         if (start_at_beginning == 0) {
2728                 stcb->asoc.last_used_address = NULL;
2729                 goto sctp_from_the_top;
2730         }
2731         /* now try for any higher scope than the destination */
2732         stcb->asoc.last_used_address = starting_point;
2733         start_at_beginning = 0;
2734 sctp_from_the_top2:
2735         if (stcb->asoc.last_used_address == NULL) {
2736                 start_at_beginning = 1;
2737                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2738         }
2739         /* search beginning with the last used address */
2740         for (laddr = stcb->asoc.last_used_address; laddr;
2741             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2742                 if (laddr->ifa == NULL) {
2743                         /* address has been removed */
2744                         continue;
2745                 }
2746                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2747                         /* address is being deleted */
2748                         continue;
2749                 }
2750                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2751                     dest_is_priv, fam);
2752                 if (sifa == NULL)
2753                         continue;
2754                 if (((non_asoc_addr_ok == 0) &&
2755                     (sctp_is_addr_restricted(stcb, sifa))) ||
2756                     (non_asoc_addr_ok &&
2757                     (sctp_is_addr_restricted(stcb, sifa)) &&
2758                     (!sctp_is_addr_pending(stcb, sifa)))) {
2759                         /* on the no-no list */
2760                         continue;
2761                 }
2762                 stcb->asoc.last_used_address = laddr;
2763                 atomic_add_int(&sifa->refcount, 1);
2764                 return (sifa);
2765         }
2766         if (start_at_beginning == 0) {
2767                 stcb->asoc.last_used_address = NULL;
2768                 goto sctp_from_the_top2;
2769         }
2770         return (NULL);
2771 }
2772
2773 static struct sctp_ifa *
2774 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2775     struct sctp_inpcb *inp,
2776     struct sctp_tcb *stcb,
2777     int non_asoc_addr_ok,
2778     uint8_t dest_is_loop,
2779     uint8_t dest_is_priv,
2780     int addr_wanted,
2781     sa_family_t fam,
2782     sctp_route_t * ro
2783 )
2784 {
2785         struct sctp_ifa *ifa, *sifa;
2786         int num_eligible_addr = 0;
2787
2788 #ifdef INET6
2789         struct sockaddr_in6 sin6, lsa6;
2790
2791         if (fam == AF_INET6) {
2792                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2793                 (void)sa6_recoverscope(&sin6);
2794         }
2795 #endif                          /* INET6 */
2796         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2797 #ifdef INET
2798                 if ((ifa->address.sa.sa_family == AF_INET) &&
2799                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2800                     &ifa->address.sin.sin_addr) != 0)) {
2801                         continue;
2802                 }
2803 #endif
2804 #ifdef INET6
2805                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2806                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2807                     &ifa->address.sin6.sin6_addr) != 0)) {
2808                         continue;
2809                 }
2810 #endif
2811                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2812                     (non_asoc_addr_ok == 0))
2813                         continue;
2814                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2815                     dest_is_priv, fam);
2816                 if (sifa == NULL)
2817                         continue;
2818 #ifdef INET6
2819                 if (fam == AF_INET6 &&
2820                     dest_is_loop &&
2821                     sifa->src_is_loop && sifa->src_is_priv) {
2822                         /*
2823                          * don't allow fe80::1 to be a src on loop ::1, we
2824                          * don't list it to the peer so we will get an
2825                          * abort.
2826                          */
2827                         continue;
2828                 }
2829                 if (fam == AF_INET6 &&
2830                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2831                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2832                         /*
2833                          * link-local <-> link-local must belong to the same
2834                          * scope.
2835                          */
2836                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2837                         (void)sa6_recoverscope(&lsa6);
2838                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2839                                 continue;
2840                         }
2841                 }
2842 #endif                          /* INET6 */
2843
2844                 /*
2845                  * Check if the IPv6 address matches to next-hop. In the
2846                  * mobile case, old IPv6 address may be not deleted from the
2847                  * interface. Then, the interface has previous and new
2848                  * addresses.  We should use one corresponding to the
2849                  * next-hop.  (by micchie)
2850                  */
2851 #ifdef INET6
2852                 if (stcb && fam == AF_INET6 &&
2853                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2854                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2855                             == 0) {
2856                                 continue;
2857                         }
2858                 }
2859 #endif
2860 #ifdef INET
2861                 /* Avoid topologically incorrect IPv4 address */
2862                 if (stcb && fam == AF_INET &&
2863                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2864                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2865                                 continue;
2866                         }
2867                 }
2868 #endif
2869                 if (stcb) {
2870                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2871                                 continue;
2872                         }
2873                         if (((non_asoc_addr_ok == 0) &&
2874                             (sctp_is_addr_restricted(stcb, sifa))) ||
2875                             (non_asoc_addr_ok &&
2876                             (sctp_is_addr_restricted(stcb, sifa)) &&
2877                             (!sctp_is_addr_pending(stcb, sifa)))) {
2878                                 /*
2879                                  * It is restricted for some reason..
2880                                  * probably not yet added.
2881                                  */
2882                                 continue;
2883                         }
2884                 }
2885                 if (num_eligible_addr >= addr_wanted) {
2886                         return (sifa);
2887                 }
2888                 num_eligible_addr++;
2889         }
2890         return (NULL);
2891 }
2892
2893
2894 static int
2895 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2896     struct sctp_inpcb *inp,
2897     struct sctp_tcb *stcb,
2898     int non_asoc_addr_ok,
2899     uint8_t dest_is_loop,
2900     uint8_t dest_is_priv,
2901     sa_family_t fam)
2902 {
2903         struct sctp_ifa *ifa, *sifa;
2904         int num_eligible_addr = 0;
2905
2906         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2907 #ifdef INET
2908                 if ((ifa->address.sa.sa_family == AF_INET) &&
2909                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2910                     &ifa->address.sin.sin_addr) != 0)) {
2911                         continue;
2912                 }
2913 #endif
2914 #ifdef INET6
2915                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2916                     (stcb != NULL) &&
2917                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2918                     &ifa->address.sin6.sin6_addr) != 0)) {
2919                         continue;
2920                 }
2921 #endif
2922                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2923                     (non_asoc_addr_ok == 0)) {
2924                         continue;
2925                 }
2926                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2927                     dest_is_priv, fam);
2928                 if (sifa == NULL) {
2929                         continue;
2930                 }
2931                 if (stcb) {
2932                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2933                                 continue;
2934                         }
2935                         if (((non_asoc_addr_ok == 0) &&
2936                             (sctp_is_addr_restricted(stcb, sifa))) ||
2937                             (non_asoc_addr_ok &&
2938                             (sctp_is_addr_restricted(stcb, sifa)) &&
2939                             (!sctp_is_addr_pending(stcb, sifa)))) {
2940                                 /*
2941                                  * It is restricted for some reason..
2942                                  * probably not yet added.
2943                                  */
2944                                 continue;
2945                         }
2946                 }
2947                 num_eligible_addr++;
2948         }
2949         return (num_eligible_addr);
2950 }
2951
2952 static struct sctp_ifa *
2953 sctp_choose_boundall(struct sctp_inpcb *inp,
2954     struct sctp_tcb *stcb,
2955     struct sctp_nets *net,
2956     sctp_route_t * ro,
2957     uint32_t vrf_id,
2958     uint8_t dest_is_priv,
2959     uint8_t dest_is_loop,
2960     int non_asoc_addr_ok,
2961     sa_family_t fam)
2962 {
2963         int cur_addr_num = 0, num_preferred = 0;
2964         void *ifn;
2965         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2966         struct sctp_ifa *sctp_ifa, *sifa;
2967         uint32_t ifn_index;
2968         struct sctp_vrf *vrf;
2969
2970 #ifdef INET
2971         int retried = 0;
2972
2973 #endif
2974
2975         /*-
2976          * For boundall we can use any address in the association.
2977          * If non_asoc_addr_ok is set we can use any address (at least in
2978          * theory). So we look for preferred addresses first. If we find one,
2979          * we use it. Otherwise we next try to get an address on the
2980          * interface, which we should be able to do (unless non_asoc_addr_ok
2981          * is false and we are routed out that way). In these cases where we
2982          * can't use the address of the interface we go through all the
2983          * ifn's looking for an address we can use and fill that in. Punting
2984          * means we send back address 0, which will probably cause problems
2985          * actually since then IP will fill in the address of the route ifn,
2986          * which means we probably already rejected it.. i.e. here comes an
2987          * abort :-<.
2988          */
2989         vrf = sctp_find_vrf(vrf_id);
2990         if (vrf == NULL)
2991                 return (NULL);
2992
2993         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2994         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2995         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2996         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2997         if (sctp_ifn == NULL) {
2998                 /* ?? We don't have this guy ?? */
2999                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3000                 goto bound_all_plan_b;
3001         }
3002         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3003             ifn_index, sctp_ifn->ifn_name);
3004
3005         if (net) {
3006                 cur_addr_num = net->indx_of_eligible_next_to_use;
3007         }
3008         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3009             inp, stcb,
3010             non_asoc_addr_ok,
3011             dest_is_loop,
3012             dest_is_priv, fam);
3013         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3014             num_preferred, sctp_ifn->ifn_name);
3015         if (num_preferred == 0) {
3016                 /*
3017                  * no eligible addresses, we must use some other interface
3018                  * address if we can find one.
3019                  */
3020                 goto bound_all_plan_b;
3021         }
3022         /*
3023          * Ok we have num_eligible_addr set with how many we can use, this
3024          * may vary from call to call due to addresses being deprecated
3025          * etc..
3026          */
3027         if (cur_addr_num >= num_preferred) {
3028                 cur_addr_num = 0;
3029         }
3030         /*
3031          * select the nth address from the list (where cur_addr_num is the
3032          * nth) and 0 is the first one, 1 is the second one etc...
3033          */
3034         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3035
3036         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3037             dest_is_priv, cur_addr_num, fam, ro);
3038
3039         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3040         if (sctp_ifa) {
3041                 atomic_add_int(&sctp_ifa->refcount, 1);
3042                 if (net) {
3043                         /* save off where the next one we will want */
3044                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3045                 }
3046                 return (sctp_ifa);
3047         }
3048         /*
3049          * plan_b: Look at all interfaces and find a preferred address. If
3050          * no preferred fall through to plan_c.
3051          */
3052 bound_all_plan_b:
3053         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3054         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3055                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3056                     sctp_ifn->ifn_name);
3057                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3058                         /* wrong base scope */
3059                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3060                         continue;
3061                 }
3062                 if ((sctp_ifn == looked_at) && looked_at) {
3063                         /* already looked at this guy */
3064                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3065                         continue;
3066                 }
3067                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3068                     dest_is_loop, dest_is_priv, fam);
3069                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3070                     "Found ifn:%p %d preferred source addresses\n",
3071                     ifn, num_preferred);
3072                 if (num_preferred == 0) {
3073                         /* None on this interface. */
3074                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
3075                         continue;
3076                 }
3077                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3078                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3079                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3080
3081                 /*
3082                  * Ok we have num_eligible_addr set with how many we can
3083                  * use, this may vary from call to call due to addresses
3084                  * being deprecated etc..
3085                  */
3086                 if (cur_addr_num >= num_preferred) {
3087                         cur_addr_num = 0;
3088                 }
3089                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3090                     dest_is_priv, cur_addr_num, fam, ro);
3091                 if (sifa == NULL)
3092                         continue;
3093                 if (net) {
3094                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3096                             cur_addr_num);
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3101                 }
3102                 atomic_add_int(&sifa->refcount, 1);
3103                 return (sifa);
3104         }
3105 #ifdef INET
3106 again_with_private_addresses_allowed:
3107 #endif
3108         /* plan_c: do we have an acceptable address on the emit interface */
3109         sifa = NULL;
3110         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3111         if (emit_ifn == NULL) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3113                 goto plan_d;
3114         }
3115         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3116                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3117 #ifdef INET
3118                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3119                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3120                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122                         continue;
3123                 }
3124 #endif
3125 #ifdef INET6
3126                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3127                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3128                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3129                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3130                         continue;
3131                 }
3132 #endif
3133                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3134                     (non_asoc_addr_ok == 0)) {
3135                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3136                         continue;
3137                 }
3138                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3139                     dest_is_priv, fam);
3140                 if (sifa == NULL) {
3141                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3142                         continue;
3143                 }
3144                 if (stcb) {
3145                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3146                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3147                                 sifa = NULL;
3148                                 continue;
3149                         }
3150                         if (((non_asoc_addr_ok == 0) &&
3151                             (sctp_is_addr_restricted(stcb, sifa))) ||
3152                             (non_asoc_addr_ok &&
3153                             (sctp_is_addr_restricted(stcb, sifa)) &&
3154                             (!sctp_is_addr_pending(stcb, sifa)))) {
3155                                 /*
3156                                  * It is restricted for some reason..
3157                                  * probably not yet added.
3158                                  */
3159                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3160                                 sifa = NULL;
3161                                 continue;
3162                         }
3163                 }
3164                 atomic_add_int(&sifa->refcount, 1);
3165                 goto out;
3166         }
3167 plan_d:
3168         /*
3169          * plan_d: We are in trouble. No preferred address on the emit
3170          * interface. And not even a preferred address on all interfaces. Go
3171          * out and see if we can find an acceptable address somewhere
3172          * amongst all interfaces.
3173          */
3174         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3175         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3176                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3177                         /* wrong base scope */
3178                         continue;
3179                 }
3180                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3181 #ifdef INET
3182                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3183                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3184                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3185                                 continue;
3186                         }
3187 #endif
3188 #ifdef INET6
3189                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3190                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3191                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3192                                 continue;
3193                         }
3194 #endif
3195                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3196                             (non_asoc_addr_ok == 0))
3197                                 continue;
3198                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3199                             dest_is_loop,
3200                             dest_is_priv, fam);
3201                         if (sifa == NULL)
3202                                 continue;
3203                         if (stcb) {
3204                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3205                                         sifa = NULL;
3206                                         continue;
3207                                 }
3208                                 if (((non_asoc_addr_ok == 0) &&
3209                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3210                                     (non_asoc_addr_ok &&
3211                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3212                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3213                                         /*
3214                                          * It is restricted for some
3215                                          * reason.. probably not yet added.
3216                                          */
3217                                         sifa = NULL;
3218                                         continue;
3219                                 }
3220                         }
3221                         goto out;
3222                 }
3223         }
3224 #ifdef INET
3225         if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3226                 stcb->asoc.scope.ipv4_local_scope = 1;
3227                 retried = 1;
3228                 goto again_with_private_addresses_allowed;
3229         } else if (retried == 1) {
3230                 stcb->asoc.scope.ipv4_local_scope = 0;
3231         }
3232 #endif
3233 out:
3234 #ifdef INET
3235         if (sifa) {
3236                 if (retried == 1) {
3237                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3238                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3239                                         /* wrong base scope */
3240                                         continue;
3241                                 }
3242                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3243                                         struct sctp_ifa *tmp_sifa;
3244
3245 #ifdef INET
3246                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3247                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3248                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3249                                                 continue;
3250                                         }
3251 #endif
3252 #ifdef INET6
3253                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3254                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3255                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3256                                                 continue;
3257                                         }
3258 #endif
3259                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3260                                             (non_asoc_addr_ok == 0))
3261                                                 continue;
3262                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3263                                             dest_is_loop,
3264                                             dest_is_priv, fam);
3265                                         if (tmp_sifa == NULL) {
3266                                                 continue;
3267                                         }
3268                                         if (tmp_sifa == sifa) {
3269                                                 continue;
3270                                         }
3271                                         if (stcb) {
3272                                                 if (sctp_is_address_in_scope(tmp_sifa,
3273                                                     &stcb->asoc.scope, 0) == 0) {
3274                                                         continue;
3275                                                 }
3276                                                 if (((non_asoc_addr_ok == 0) &&
3277                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3278                                                     (non_asoc_addr_ok &&
3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3280                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3281                                                         /*
3282                                                          * It is restricted
3283                                                          * for some reason..
3284                                                          * probably not yet
3285                                                          * added.
3286                                                          */
3287                                                         continue;
3288                                                 }
3289                                         }
3290                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3291                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3292                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3293                                         }
3294                                 }
3295                         }
3296                 }
3297                 atomic_add_int(&sifa->refcount, 1);
3298         }
3299 #endif
3300         return (sifa);
3301 }
3302
3303
3304
3305 /* tcb may be NULL */
3306 struct sctp_ifa *
3307 sctp_source_address_selection(struct sctp_inpcb *inp,
3308     struct sctp_tcb *stcb,
3309     sctp_route_t * ro,
3310     struct sctp_nets *net,
3311     int non_asoc_addr_ok, uint32_t vrf_id)
3312 {
3313         struct sctp_ifa *answer;
3314         uint8_t dest_is_priv, dest_is_loop;
3315         sa_family_t fam;
3316
3317 #ifdef INET
3318         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3319
3320 #endif
3321 #ifdef INET6
3322         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3323
3324 #endif
3325
3326         /**
3327          * Rules: - Find the route if needed, cache if I can. - Look at
3328          * interface address in route, Is it in the bound list. If so we
3329          * have the best source. - If not we must rotate amongst the
3330          * addresses.
3331          *
3332          * Cavets and issues
3333          *
3334          * Do we need to pay attention to scope. We can have a private address
3335          * or a global address we are sourcing or sending to. So if we draw
3336          * it out
3337          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3338          * For V4
3339          * ------------------------------------------
3340          *      source     *      dest  *  result
3341          * -----------------------------------------
3342          * <a>  Private    *    Global  *  NAT
3343          * -----------------------------------------
3344          * <b>  Private    *    Private *  No problem
3345          * -----------------------------------------
3346          * <c>  Global     *    Private *  Huh, How will this work?
3347          * -----------------------------------------
3348          * <d>  Global     *    Global  *  No Problem
3349          *------------------------------------------
3350          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3351          * For V6
3352          *------------------------------------------
3353          *      source     *      dest  *  result
3354          * -----------------------------------------
3355          * <a>  Linklocal  *    Global  *
3356          * -----------------------------------------
3357          * <b>  Linklocal  * Linklocal  *  No problem
3358          * -----------------------------------------
3359          * <c>  Global     * Linklocal  *  Huh, How will this work?
3360          * -----------------------------------------
3361          * <d>  Global     *    Global  *  No Problem
3362          *------------------------------------------
3363          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3364          *
3365          * And then we add to that what happens if there are multiple addresses
3366          * assigned to an interface. Remember the ifa on a ifn is a linked
3367          * list of addresses. So one interface can have more than one IP
3368          * address. What happens if we have both a private and a global
3369          * address? Do we then use context of destination to sort out which
3370          * one is best? And what about NAT's sending P->G may get you a NAT
3371          * translation, or should you select the G thats on the interface in
3372          * preference.
3373          *
3374          * Decisions:
3375          *
3376          * - count the number of addresses on the interface.
3377          * - if it is one, no problem except case <c>.
3378          *   For <a> we will assume a NAT out there.
3379          * - if there are more than one, then we need to worry about scope P
3380          *   or G. We should prefer G -> G and P -> P if possible.
3381          *   Then as a secondary fall back to mixed types G->P being a last
3382          *   ditch one.
3383          * - The above all works for bound all, but bound specific we need to
3384          *   use the same concept but instead only consider the bound
3385          *   addresses. If the bound set is NOT assigned to the interface then
3386          *   we must use rotation amongst the bound addresses..
3387          */
3388         if (ro->ro_rt == NULL) {
3389                 /*
3390                  * Need a route to cache.
3391                  */
3392                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3393         }
3394         if (ro->ro_rt == NULL) {
3395                 return (NULL);
3396         }
3397         fam = ro->ro_dst.sa_family;
3398         dest_is_priv = dest_is_loop = 0;
3399         /* Setup our scopes for the destination */
3400         switch (fam) {
3401 #ifdef INET
3402         case AF_INET:
3403                 /* Scope based on outbound address */
3404                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3405                         dest_is_loop = 1;
3406                         if (net != NULL) {
3407                                 /* mark it as local */
3408                                 net->addr_is_local = 1;
3409                         }
3410                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3411                         dest_is_priv = 1;
3412                 }
3413                 break;
3414 #endif
3415 #ifdef INET6
3416         case AF_INET6:
3417                 /* Scope based on outbound address */
3418                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3419                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3420                         /*
3421                          * If the address is a loopback address, which
3422                          * consists of "::1" OR "fe80::1%lo0", we are
3423                          * loopback scope. But we don't use dest_is_priv
3424                          * (link local addresses).
3425                          */
3426                         dest_is_loop = 1;
3427                         if (net != NULL) {
3428                                 /* mark it as local */
3429                                 net->addr_is_local = 1;
3430                         }
3431                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3432                         dest_is_priv = 1;
3433                 }
3434                 break;
3435 #endif
3436         }
3437         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3438         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3439         SCTP_IPI_ADDR_RLOCK();
3440         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3441                 /*
3442                  * Bound all case
3443                  */
3444                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3445                     dest_is_priv, dest_is_loop,
3446                     non_asoc_addr_ok, fam);
3447                 SCTP_IPI_ADDR_RUNLOCK();
3448                 return (answer);
3449         }
3450         /*
3451          * Subset bound case
3452          */
3453         if (stcb) {
3454                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3455                     vrf_id, dest_is_priv,
3456                     dest_is_loop,
3457                     non_asoc_addr_ok, fam);
3458         } else {
3459                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3460                     non_asoc_addr_ok,
3461                     dest_is_priv,
3462                     dest_is_loop, fam);
3463         }
3464         SCTP_IPI_ADDR_RUNLOCK();
3465         return (answer);
3466 }
3467
3468 static int
3469 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3470 {
3471         struct cmsghdr cmh;
3472         int tlen, at, found;
3473         struct sctp_sndinfo sndinfo;
3474         struct sctp_prinfo prinfo;
3475         struct sctp_authinfo authinfo;
3476
3477         tlen = SCTP_BUF_LEN(control);
3478         at = 0;
3479         found = 0;
3480         /*
3481          * Independent of how many mbufs, find the c_type inside the control
3482          * structure and copy out the data.
3483          */
3484         while (at < tlen) {
3485                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3486                         /* There is not enough room for one more. */
3487                         return (found);
3488                 }
3489                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3490                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3491                         /* We dont't have a complete CMSG header. */
3492                         return (found);
3493                 }
3494                 if (((int)cmh.cmsg_len + at) > tlen) {
3495                         /* We don't have the complete CMSG. */
3496                         return (found);
3497                 }
3498                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3499                     ((c_type == cmh.cmsg_type) ||
3500                     ((c_type == SCTP_SNDRCV) &&
3501                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3502                     (cmh.cmsg_type == SCTP_PRINFO) ||
3503                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3504                         if (c_type == cmh.cmsg_type) {
3505                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3506                                         return (found);
3507                                 }
3508                                 /* It is exactly what we want. Copy it out. */
3509                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3510                                 return (1);
3511                         } else {
3512                                 struct sctp_sndrcvinfo *sndrcvinfo;
3513
3514                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3515                                 if (found == 0) {
3516                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3517                                                 return (found);
3518                                         }
3519                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3520                                 }
3521                                 switch (cmh.cmsg_type) {
3522                                 case SCTP_SNDINFO:
3523                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3524                                                 return (found);
3525                                         }
3526                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3527                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3528                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3529                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3530                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3531                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3532                                         break;
3533                                 case SCTP_PRINFO:
3534                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3535                                                 return (found);
3536                                         }
3537                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3538                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3539                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3540                                         } else {
3541                                                 sndrcvinfo->sinfo_timetolive = 0;
3542                                         }
3543                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3544                                         break;
3545                                 case SCTP_AUTHINFO:
3546                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3547                                                 return (found);
3548                                         }
3549                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3550                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3551                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3552                                         break;
3553                                 default:
3554                                         return (found);
3555                                 }
3556                                 found = 1;
3557                         }
3558                 }
3559                 at += CMSG_ALIGN(cmh.cmsg_len);
3560         }
3561         return (found);
3562 }
3563
3564 static int
3565 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3566 {
3567         struct cmsghdr cmh;
3568         int tlen, at;
3569         struct sctp_initmsg initmsg;
3570
3571 #ifdef INET
3572         struct sockaddr_in sin;
3573
3574 #endif
3575 #ifdef INET6
3576         struct sockaddr_in6 sin6;
3577
3578 #endif
3579
3580         tlen = SCTP_BUF_LEN(control);
3581         at = 0;
3582         while (at < tlen) {
3583                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3584                         /* There is not enough room for one more. */
3585                         *error = EINVAL;
3586                         return (1);
3587                 }
3588                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3589                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3590                         /* We dont't have a complete CMSG header. */
3591                         *error = EINVAL;
3592                         return (1);
3593                 }
3594                 if (((int)cmh.cmsg_len + at) > tlen) {
3595                         /* We don't have the complete CMSG. */
3596                         *error = EINVAL;
3597                         return (1);
3598                 }
3599                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3600                         switch (cmh.cmsg_type) {
3601                         case SCTP_INIT:
3602                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3603                                         *error = EINVAL;
3604                                         return (1);
3605                                 }
3606                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3607                                 if (initmsg.sinit_max_attempts)
3608                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3609                                 if (initmsg.sinit_num_ostreams)
3610                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3611                                 if (initmsg.sinit_max_instreams)
3612                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3613                                 if (initmsg.sinit_max_init_timeo)
3614                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3615                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3616                                         struct sctp_stream_out *tmp_str;
3617                                         unsigned int i;
3618
3619 #if defined(SCTP_DETAILED_STR_STATS)
3620                                         int j;
3621
3622 #endif
3623
3624                                         /* Default is NOT correct */
3625                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3626                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3627                                         SCTP_TCB_UNLOCK(stcb);
3628                                         SCTP_MALLOC(tmp_str,
3629                                             struct sctp_stream_out *,
3630                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3631                                             SCTP_M_STRMO);
3632                                         SCTP_TCB_LOCK(stcb);
3633                                         if (tmp_str != NULL) {
3634                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3635                                                 stcb->asoc.strmout = tmp_str;
3636                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3637                                         } else {
3638                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3639                                         }
3640                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3641                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3642                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3643                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3644 #if defined(SCTP_DETAILED_STR_STATS)
3645                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3646                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3647                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3648                                                 }
3649 #else
3650                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3651                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3652 #endif
3653                                                 stcb->asoc.strmout[i].stream_no = i;
3654                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3655                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3656                                         }
3657                                 }
3658                                 break;
3659 #ifdef INET
3660                         case SCTP_DSTADDRV4:
3661                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3662                                         *error = EINVAL;
3663                                         return (1);
3664                                 }
3665                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3666                                 sin.sin_family = AF_INET;
3667                                 sin.sin_len = sizeof(struct sockaddr_in);
3668                                 sin.sin_port = stcb->rport;
3669                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3670                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3671                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3672                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3673                                         *error = EINVAL;
3674                                         return (1);
3675                                 }
3676                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3677                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3678                                         *error = ENOBUFS;
3679                                         return (1);
3680                                 }
3681                                 break;
3682 #endif
3683 #ifdef INET6
3684                         case SCTP_DSTADDRV6:
3685                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3686                                         *error = EINVAL;
3687                                         return (1);
3688                                 }
3689                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3690                                 sin6.sin6_family = AF_INET6;
3691                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3692                                 sin6.sin6_port = stcb->rport;
3693                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3694                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3695                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3696                                         *error = EINVAL;
3697                                         return (1);
3698                                 }
3699 #ifdef INET
3700                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3701                                         in6_sin6_2_sin(&sin, &sin6);
3702                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3703                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3704                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3705                                                 *error = EINVAL;
3706                                                 return (1);
3707                                         }
3708                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3709                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710                                                 *error = ENOBUFS;
3711                                                 return (1);
3712                                         }
3713                                 } else
3714 #endif
3715                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3716                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3717                                         *error = ENOBUFS;
3718                                         return (1);
3719                                 }
3720                                 break;
3721 #endif
3722                         default:
3723                                 break;
3724                         }
3725                 }
3726                 at += CMSG_ALIGN(cmh.cmsg_len);
3727         }
3728         return (0);
3729 }
3730
3731 static struct sctp_tcb *
3732 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3733     uint16_t port,
3734     struct mbuf *control,
3735     struct sctp_nets **net_p,
3736     int *error)
3737 {
3738         struct cmsghdr cmh;
3739         int tlen, at;
3740         struct sctp_tcb *stcb;
3741         struct sockaddr *addr;
3742
3743 #ifdef INET
3744         struct sockaddr_in sin;
3745
3746 #endif
3747 #ifdef INET6
3748         struct sockaddr_in6 sin6;
3749
3750 #endif
3751
3752         tlen = SCTP_BUF_LEN(control);
3753         at = 0;
3754         while (at < tlen) {
3755                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3756                         /* There is not enough room for one more. */
3757                         *error = EINVAL;
3758                         return (NULL);
3759                 }
3760                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3761                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3762                         /* We dont't have a complete CMSG header. */
3763                         *error = EINVAL;
3764                         return (NULL);
3765                 }
3766                 if (((int)cmh.cmsg_len + at) > tlen) {
3767                         /* We don't have the complete CMSG. */
3768                         *error = EINVAL;
3769                         return (NULL);
3770                 }
3771                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3772                         switch (cmh.cmsg_type) {
3773 #ifdef INET
3774                         case SCTP_DSTADDRV4:
3775                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3776                                         *error = EINVAL;
3777                                         return (NULL);
3778                                 }
3779                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3780                                 sin.sin_family = AF_INET;
3781                                 sin.sin_len = sizeof(struct sockaddr_in);
3782                                 sin.sin_port = port;
3783                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3784                                 addr = (struct sockaddr *)&sin;
3785                                 break;
3786 #endif
3787 #ifdef INET6
3788                         case SCTP_DSTADDRV6:
3789                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3790                                         *error = EINVAL;
3791                                         return (NULL);
3792                                 }
3793                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3794                                 sin6.sin6_family = AF_INET6;
3795                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3796                                 sin6.sin6_port = port;
3797                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3798 #ifdef INET
3799                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3800                                         in6_sin6_2_sin(&sin, &sin6);
3801                                         addr = (struct sockaddr *)&sin;
3802                                 } else
3803 #endif
3804                                         addr = (struct sockaddr *)&sin6;
3805                                 break;
3806 #endif
3807                         default:
3808                                 addr = NULL;
3809                                 break;
3810                         }
3811                         if (addr) {
3812                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3813                                 if (stcb != NULL) {
3814                                         return (stcb);
3815                                 }
3816                         }
3817                 }
3818                 at += CMSG_ALIGN(cmh.cmsg_len);
3819         }
3820         return (NULL);
3821 }
3822
3823 static struct mbuf *
3824 sctp_add_cookie(struct mbuf *init, int init_offset,
3825     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3826 {
3827         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3828         struct sctp_state_cookie *stc;
3829         struct sctp_paramhdr *ph;
3830         uint8_t *foo;
3831         int sig_offset;
3832         uint16_t cookie_sz;
3833
3834         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3835             sizeof(struct sctp_paramhdr)), 0,
3836             M_NOWAIT, 1, MT_DATA);
3837         if (mret == NULL) {
3838                 return (NULL);
3839         }
3840         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3841         if (copy_init == NULL) {
3842                 sctp_m_freem(mret);
3843                 return (NULL);
3844         }
3845 #ifdef SCTP_MBUF_LOGGING
3846         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3847                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3848         }
3849 #endif
3850         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3851             M_NOWAIT);
3852         if (copy_initack == NULL) {
3853                 sctp_m_freem(mret);
3854                 sctp_m_freem(copy_init);
3855                 return (NULL);
3856         }
3857 #ifdef SCTP_MBUF_LOGGING
3858         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3859                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3860         }
3861 #endif
3862         /* easy side we just drop it on the end */
3863         ph = mtod(mret, struct sctp_paramhdr *);
3864         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3865             sizeof(struct sctp_paramhdr);
3866         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3867             sizeof(struct sctp_paramhdr));
3868         ph->param_type = htons(SCTP_STATE_COOKIE);
3869         ph->param_length = 0;   /* fill in at the end */
3870         /* Fill in the stc cookie data */
3871         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3872
3873         /* tack the INIT and then the INIT-ACK onto the chain */
3874         cookie_sz = 0;
3875         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3876                 cookie_sz += SCTP_BUF_LEN(m_at);
3877                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3878                         SCTP_BUF_NEXT(m_at) = copy_init;
3879                         break;
3880                 }
3881         }
3882         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3883                 cookie_sz += SCTP_BUF_LEN(m_at);
3884                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3885                         SCTP_BUF_NEXT(m_at) = copy_initack;
3886                         break;
3887                 }
3888         }
3889         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3890                 cookie_sz += SCTP_BUF_LEN(m_at);
3891                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3892                         break;
3893                 }
3894         }
3895         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3896         if (sig == NULL) {
3897                 /* no space, so free the entire chain */
3898                 sctp_m_freem(mret);
3899                 return (NULL);
3900         }
3901         SCTP_BUF_LEN(sig) = 0;
3902         SCTP_BUF_NEXT(m_at) = sig;
3903         sig_offset = 0;
3904         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3905         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3906         *signature = foo;
3907         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3908         cookie_sz += SCTP_SIGNATURE_SIZE;
3909         ph->param_length = htons(cookie_sz);
3910         return (mret);
3911 }
3912
3913
3914 static uint8_t
3915 sctp_get_ect(struct sctp_tcb *stcb)
3916 {
3917         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3918                 return (SCTP_ECT0_BIT);
3919         } else {
3920                 return (0);
3921         }
3922 }
3923
3924 #if defined(INET) || defined(INET6)
3925 static void
3926 sctp_handle_no_route(struct sctp_tcb *stcb,
3927     struct sctp_nets *net,
3928     int so_locked)
3929 {
3930         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3931
3932         if (net) {
3933                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3934                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3935                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3936                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3937                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3938                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3939                                     stcb, 0,
3940                                     (void *)net,
3941                                     so_locked);
3942                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3943                                 net->dest_state &= ~SCTP_ADDR_PF;
3944                         }
3945                 }
3946                 if (stcb) {
3947                         if (net == stcb->asoc.primary_destination) {
3948                                 /* need a new primary */
3949                                 struct sctp_nets *alt;
3950
3951                                 alt = sctp_find_alternate_net(stcb, net, 0);
3952                                 if (alt != net) {
3953                                         if (stcb->asoc.alternate) {
3954                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3955                                         }
3956                                         stcb->asoc.alternate = alt;
3957                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3958                                         if (net->ro._s_addr) {
3959                                                 sctp_free_ifa(net->ro._s_addr);
3960                                                 net->ro._s_addr = NULL;
3961                                         }
3962                                         net->src_addr_selected = 0;
3963                                 }
3964                         }
3965                 }
3966         }
3967 }
3968
3969 #endif
3970
3971 static int
3972 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3973     struct sctp_tcb *stcb,      /* may be NULL */
3974     struct sctp_nets *net,
3975     struct sockaddr *to,
3976     struct mbuf *m,
3977     uint32_t auth_offset,
3978     struct sctp_auth_chunk *auth,
3979     uint16_t auth_keyid,
3980     int nofragment_flag,
3981     int ecn_ok,
3982     int out_of_asoc_ok,
3983     uint16_t src_port,
3984     uint16_t dest_port,
3985     uint32_t v_tag,
3986     uint16_t port,
3987     union sctp_sockstore *over_addr,
3988     uint8_t mflowtype, uint32_t mflowid,
3989 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3990     int so_locked SCTP_UNUSED
3991 #else
3992     int so_locked
3993 #endif
3994 )
3995 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3996 {
3997         /**
3998          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3999          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4000          * - fill in the HMAC digest of any AUTH chunk in the packet.
4001          * - calculate and fill in the SCTP checksum.
4002          * - prepend an IP address header.
4003          * - if boundall use INADDR_ANY.
4004          * - if boundspecific do source address selection.
4005          * - set fragmentation option for ipV4.
4006          * - On return from IP output, check/adjust mtu size of output
4007          *   interface and smallest_mtu size as well.
4008          */
4009         /* Will need ifdefs around this */
4010         struct mbuf *newm;
4011         struct sctphdr *sctphdr;
4012         int packet_length;
4013         int ret;
4014
4015 #if defined(INET) || defined(INET6)
4016         uint32_t vrf_id;
4017
4018 #endif
4019 #if defined(INET) || defined(INET6)
4020         struct mbuf *o_pak;
4021         sctp_route_t *ro = NULL;
4022         struct udphdr *udp = NULL;
4023
4024 #endif
4025         uint8_t tos_value;
4026
4027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4028         struct socket *so = NULL;
4029
4030 #endif
4031
4032         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4033                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4034                 sctp_m_freem(m);
4035                 return (EFAULT);
4036         }
4037 #if defined(INET) || defined(INET6)
4038         if (stcb) {
4039                 vrf_id = stcb->asoc.vrf_id;
4040         } else {
4041                 vrf_id = inp->def_vrf_id;
4042         }
4043 #endif
4044         /* fill in the HMAC digest for any AUTH chunk in the packet */
4045         if ((auth != NULL) && (stcb != NULL)) {
4046                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4047         }
4048         if (net) {
4049                 tos_value = net->dscp;
4050         } else if (stcb) {
4051                 tos_value = stcb->asoc.default_dscp;
4052         } else {
4053                 tos_value = inp->sctp_ep.default_dscp;
4054         }
4055
4056         switch (to->sa_family) {
4057 #ifdef INET
4058         case AF_INET:
4059                 {
4060                         struct ip *ip = NULL;
4061                         sctp_route_t iproute;
4062                         int len;
4063
4064                         len = SCTP_MIN_V4_OVERHEAD;
4065                         if (port) {
4066                                 len += sizeof(struct udphdr);
4067                         }
4068                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4069                         if (newm == NULL) {
4070                                 sctp_m_freem(m);
4071                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4072                                 return (ENOMEM);
4073                         }
4074                         SCTP_ALIGN_TO_END(newm, len);
4075                         SCTP_BUF_LEN(newm) = len;
4076                         SCTP_BUF_NEXT(newm) = m;
4077                         m = newm;
4078                         if (net != NULL) {
4079                                 m->m_pkthdr.flowid = net->flowid;
4080                                 M_HASHTYPE_SET(m, net->flowtype);
4081                         } else {
4082                                 m->m_pkthdr.flowid = mflowid;
4083                                 M_HASHTYPE_SET(m, mflowtype);
4084                         }
4085                         packet_length = sctp_calculate_len(m);
4086                         ip = mtod(m, struct ip *);
4087                         ip->ip_v = IPVERSION;
4088                         ip->ip_hl = (sizeof(struct ip) >> 2);
4089                         if (tos_value == 0) {
4090                                 /*
4091                                  * This means especially, that it is not set
4092                                  * at the SCTP layer. So use the value from
4093                                  * the IP layer.
4094                                  */
4095                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4096                         }
4097                         tos_value &= 0xfc;
4098                         if (ecn_ok) {
4099                                 tos_value |= sctp_get_ect(stcb);
4100                         }
4101                         if ((nofragment_flag) && (port == 0)) {
4102                                 ip->ip_off = htons(IP_DF);
4103                         } else {
4104                                 ip->ip_off = htons(0);
4105                         }
4106                         /* FreeBSD has a function for ip_id's */
4107                         ip_fillid(ip);
4108
4109                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4110                         ip->ip_len = htons(packet_length);
4111                         ip->ip_tos = tos_value;
4112                         if (port) {
4113                                 ip->ip_p = IPPROTO_UDP;
4114                         } else {
4115                                 ip->ip_p = IPPROTO_SCTP;
4116                         }
4117                         ip->ip_sum = 0;
4118                         if (net == NULL) {
4119                                 ro = &iproute;
4120                                 memset(&iproute, 0, sizeof(iproute));
4121                                 memcpy(&ro->ro_dst, to, to->sa_len);
4122                         } else {
4123                                 ro = (sctp_route_t *) & net->ro;
4124                         }
4125                         /* Now the address selection part */
4126                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4127
4128                         /* call the routine to select the src address */
4129                         if (net && out_of_asoc_ok == 0) {
4130                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4131                                         sctp_free_ifa(net->ro._s_addr);
4132                                         net->ro._s_addr = NULL;
4133                                         net->src_addr_selected = 0;
4134                                         if (ro->ro_rt) {
4135                                                 RTFREE(ro->ro_rt);
4136                                                 ro->ro_rt = NULL;
4137                                         }
4138                                 }
4139                                 if (net->src_addr_selected == 0) {
4140                                         /* Cache the source address */
4141                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4142                                             ro, net, 0,
4143                                             vrf_id);
4144                                         net->src_addr_selected = 1;
4145                                 }
4146                                 if (net->ro._s_addr == NULL) {
4147                                         /* No route to host */
4148                                         net->src_addr_selected = 0;
4149                                         sctp_handle_no_route(stcb, net, so_locked);
4150                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4151                                         sctp_m_freem(m);
4152                                         return (EHOSTUNREACH);
4153                                 }
4154                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4155                         } else {
4156                                 if (over_addr == NULL) {
4157                                         struct sctp_ifa *_lsrc;
4158
4159                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4160                                             net,
4161                                             out_of_asoc_ok,
4162                                             vrf_id);
4163                                         if (_lsrc == NULL) {
4164                                                 sctp_handle_no_route(stcb, net, so_locked);
4165                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4166                                                 sctp_m_freem(m);
4167                                                 return (EHOSTUNREACH);
4168                                         }
4169                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4170                                         sctp_free_ifa(_lsrc);
4171                                 } else {
4172                                         ip->ip_src = over_addr->sin.sin_addr;
4173                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4174                                 }
4175                         }
4176                         if (port) {
4177                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4178                                         sctp_handle_no_route(stcb, net, so_locked);
4179                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4180                                         sctp_m_freem(m);
4181                                         return (EHOSTUNREACH);
4182                                 }
4183                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4184                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4185                                 udp->uh_dport = port;
4186                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4187                                 if (V_udp_cksum) {
4188                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4189                                 } else {
4190                                         udp->uh_sum = 0;
4191                                 }
4192                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4193                         } else {
4194                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4195                         }
4196
4197                         sctphdr->src_port = src_port;
4198                         sctphdr->dest_port = dest_port;
4199                         sctphdr->v_tag = v_tag;
4200                         sctphdr->checksum = 0;
4201
4202                         /*
4203                          * If source address selection fails and we find no
4204                          * route then the ip_output should fail as well with
4205                          * a NO_ROUTE_TO_HOST type error. We probably should
4206                          * catch that somewhere and abort the association
4207                          * right away (assuming this is an INIT being sent).
4208                          */
4209                         if (ro->ro_rt == NULL) {
4210                                 /*
4211                                  * src addr selection failed to find a route
4212                                  * (or valid source addr), so we can't get
4213                                  * there from here (yet)!
4214                                  */
4215                                 sctp_handle_no_route(stcb, net, so_locked);
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4217                                 sctp_m_freem(m);
4218                                 return (EHOSTUNREACH);
4219                         }
4220                         if (ro != &iproute) {
4221                                 memcpy(&iproute, ro, sizeof(*ro));
4222                         }
4223                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4224                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4225                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4226                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4227                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4228                             (void *)ro->ro_rt);
4229
4230                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4231                                 /* failed to prepend data, give up */
4232                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4233                                 sctp_m_freem(m);
4234                                 return (ENOMEM);
4235                         }
4236                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4237                         if (port) {
4238 #if defined(SCTP_WITH_NO_CSUM)
4239                                 SCTP_STAT_INCR(sctps_sendnocrc);
4240 #else
4241                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4242                                 SCTP_STAT_INCR(sctps_sendswcrc);
4243 #endif
4244                                 if (V_udp_cksum) {
4245                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4246                                 }
4247                         } else {
4248 #if defined(SCTP_WITH_NO_CSUM)
4249                                 SCTP_STAT_INCR(sctps_sendnocrc);
4250 #else
4251                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4252                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4253                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4254 #endif
4255                         }
4256 #ifdef SCTP_PACKET_LOGGING
4257                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4258                                 sctp_packet_log(o_pak);
4259 #endif
4260                         /* send it out.  table id is taken from stcb */
4261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4262                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4263                                 so = SCTP_INP_SO(inp);
4264                                 SCTP_SOCKET_UNLOCK(so, 0);
4265                         }
4266 #endif
4267                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4268 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4269                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4270                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4271                                 SCTP_TCB_UNLOCK(stcb);
4272                                 SCTP_SOCKET_LOCK(so, 0);
4273                                 SCTP_TCB_LOCK(stcb);
4274                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4275                         }
4276 #endif
4277                         SCTP_STAT_INCR(sctps_sendpackets);
4278                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4279                         if (ret)
4280                                 SCTP_STAT_INCR(sctps_senderrors);
4281
4282                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4283                         if (net == NULL) {
4284                                 /* free tempy routes */
4285                                 RO_RTFREE(ro);
4286                         } else {
4287                                 /*
4288                                  * PMTU check versus smallest asoc MTU goes
4289                                  * here
4290                                  */
4291                                 if ((ro->ro_rt != NULL) &&
4292                                     (net->ro._s_addr)) {
4293                                         uint32_t mtu;
4294
4295                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4296                                         if (net->port) {
4297                                                 mtu -= sizeof(struct udphdr);
4298                                         }
4299                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4300                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4301                                                 net->mtu = mtu;
4302                                         }
4303                                 } else if (ro->ro_rt == NULL) {
4304                                         /* route was freed */
4305                                         if (net->ro._s_addr &&
4306                                             net->src_addr_selected) {
4307                                                 sctp_free_ifa(net->ro._s_addr);
4308                                                 net->ro._s_addr = NULL;
4309                                         }
4310                                         net->src_addr_selected = 0;
4311                                 }
4312                         }
4313                         return (ret);
4314                 }
4315 #endif
4316 #ifdef INET6
4317         case AF_INET6:
4318                 {
4319                         uint32_t flowlabel, flowinfo;
4320                         struct ip6_hdr *ip6h;
4321                         struct route_in6 ip6route;
4322                         struct ifnet *ifp;
4323                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4324                         int prev_scope = 0;
4325                         struct sockaddr_in6 lsa6_storage;
4326                         int error;
4327                         u_short prev_port = 0;
4328                         int len;
4329
4330                         if (net) {
4331                                 flowlabel = net->flowlabel;
4332                         } else if (stcb) {
4333                                 flowlabel = stcb->asoc.default_flowlabel;
4334                         } else {
4335                                 flowlabel = inp->sctp_ep.default_flowlabel;
4336                         }
4337                         if (flowlabel == 0) {
4338                                 /*
4339                                  * This means especially, that it is not set
4340                                  * at the SCTP layer. So use the value from
4341                                  * the IP layer.
4342                                  */
4343                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4344                         }
4345                         flowlabel &= 0x000fffff;
4346                         len = SCTP_MIN_OVERHEAD;
4347                         if (port) {
4348                                 len += sizeof(struct udphdr);
4349                         }
4350                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4351                         if (newm == NULL) {
4352                                 sctp_m_freem(m);
4353                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4354                                 return (ENOMEM);
4355                         }
4356                         SCTP_ALIGN_TO_END(newm, len);
4357                         SCTP_BUF_LEN(newm) = len;
4358                         SCTP_BUF_NEXT(newm) = m;
4359                         m = newm;
4360                         if (net != NULL) {
4361                                 m->m_pkthdr.flowid = net->flowid;
4362                                 M_HASHTYPE_SET(m, net->flowtype);
4363                         } else {
4364                                 m->m_pkthdr.flowid = mflowid;
4365                                 M_HASHTYPE_SET(m, mflowtype);
4366                         }
4367                         packet_length = sctp_calculate_len(m);
4368
4369                         ip6h = mtod(m, struct ip6_hdr *);
4370                         /* protect *sin6 from overwrite */
4371                         sin6 = (struct sockaddr_in6 *)to;
4372                         tmp = *sin6;
4373                         sin6 = &tmp;
4374
4375                         /* KAME hack: embed scopeid */
4376                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4377                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4378                                 return (EINVAL);
4379                         }
4380                         if (net == NULL) {
4381                                 memset(&ip6route, 0, sizeof(ip6route));
4382                                 ro = (sctp_route_t *) & ip6route;
4383                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4384                         } else {
4385                                 ro = (sctp_route_t *) & net->ro;
4386                         }
4387                         /*
4388                          * We assume here that inp_flow is in host byte
4389                          * order within the TCB!
4390                          */
4391                         if (tos_value == 0) {
4392                                 /*
4393                                  * This means especially, that it is not set
4394                                  * at the SCTP layer. So use the value from
4395                                  * the IP layer.
4396                                  */
4397                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4398                         }
4399                         tos_value &= 0xfc;
4400                         if (ecn_ok) {
4401                                 tos_value |= sctp_get_ect(stcb);
4402                         }
4403                         flowinfo = 0x06;
4404                         flowinfo <<= 8;
4405                         flowinfo |= tos_value;
4406                         flowinfo <<= 20;
4407                         flowinfo |= flowlabel;
4408                         ip6h->ip6_flow = htonl(flowinfo);
4409                         if (port) {
4410                                 ip6h->ip6_nxt = IPPROTO_UDP;
4411                         } else {
4412                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4413                         }
4414                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4415                         ip6h->ip6_dst = sin6->sin6_addr;
4416
4417                         /*
4418                          * Add SRC address selection here: we can only reuse
4419                          * to a limited degree the kame src-addr-sel, since
4420                          * we can try their selection but it may not be
4421                          * bound.
4422                          */
4423                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4424                         lsa6_tmp.sin6_family = AF_INET6;
4425                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4426                         lsa6 = &lsa6_tmp;
4427                         if (net && out_of_asoc_ok == 0) {
4428                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4429                                         sctp_free_ifa(net->ro._s_addr);
4430                                         net->ro._s_addr = NULL;
4431                                         net->src_addr_selected = 0;
4432                                         if (ro->ro_rt) {
4433                                                 RTFREE(ro->ro_rt);
4434                                                 ro->ro_rt = NULL;
4435                                         }
4436                                 }
4437                                 if (net->src_addr_selected == 0) {
4438                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4439                                         /* KAME hack: embed scopeid */
4440                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4441                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4442                                                 return (EINVAL);
4443                                         }
4444                                         /* Cache the source address */
4445                                         net->ro._s_addr = sctp_source_address_selection(inp,
4446                                             stcb,
4447                                             ro,
4448                                             net,
4449                                             0,
4450                                             vrf_id);
4451                                         (void)sa6_recoverscope(sin6);
4452                                         net->src_addr_selected = 1;
4453                                 }
4454                                 if (net->ro._s_addr == NULL) {
4455                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4456                                         net->src_addr_selected = 0;
4457                                         sctp_handle_no_route(stcb, net, so_locked);
4458                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4459                                         sctp_m_freem(m);
4460                                         return (EHOSTUNREACH);
4461                                 }
4462                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4463                         } else {
4464                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4465                                 /* KAME hack: embed scopeid */
4466                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4467                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4468                                         return (EINVAL);
4469                                 }
4470                                 if (over_addr == NULL) {
4471                                         struct sctp_ifa *_lsrc;
4472
4473                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4474                                             net,
4475                                             out_of_asoc_ok,
4476                                             vrf_id);
4477                                         if (_lsrc == NULL) {
4478                                                 sctp_handle_no_route(stcb, net, so_locked);
4479                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4480                                                 sctp_m_freem(m);
4481                                                 return (EHOSTUNREACH);
4482                                         }
4483                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4484                                         sctp_free_ifa(_lsrc);
4485                                 } else {
4486                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4487                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4488                                 }
4489                                 (void)sa6_recoverscope(sin6);
4490                         }
4491                         lsa6->sin6_port = inp->sctp_lport;
4492
4493                         if (ro->ro_rt == NULL) {
4494                                 /*
4495                                  * src addr selection failed to find a route
4496                                  * (or valid source addr), so we can't get
4497                                  * there from here!
4498                                  */
4499                                 sctp_handle_no_route(stcb, net, so_locked);
4500                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4501                                 sctp_m_freem(m);
4502                                 return (EHOSTUNREACH);
4503                         }
4504                         /*
4505                          * XXX: sa6 may not have a valid sin6_scope_id in
4506                          * the non-SCOPEDROUTING case.
4507                          */
4508                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4509                         lsa6_storage.sin6_family = AF_INET6;
4510                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4511                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4512                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4513                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4514                                 sctp_m_freem(m);
4515                                 return (error);
4516                         }
4517                         /* XXX */
4518                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4519                         lsa6_storage.sin6_port = inp->sctp_lport;
4520                         lsa6 = &lsa6_storage;
4521                         ip6h->ip6_src = lsa6->sin6_addr;
4522
4523                         if (port) {
4524                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4525                                         sctp_handle_no_route(stcb, net, so_locked);
4526                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4527                                         sctp_m_freem(m);
4528                                         return (EHOSTUNREACH);
4529                                 }
4530                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4531                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4532                                 udp->uh_dport = port;
4533                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4534                                 udp->uh_sum = 0;
4535                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4536                         } else {
4537                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4538                         }
4539
4540                         sctphdr->src_port = src_port;
4541                         sctphdr->dest_port = dest_port;
4542                         sctphdr->v_tag = v_tag;
4543                         sctphdr->checksum = 0;
4544
4545                         /*
4546                          * We set the hop limit now since there is a good
4547                          * chance that our ro pointer is now filled
4548                          */
4549                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4550                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4551
4552 #ifdef SCTP_DEBUG
4553                         /* Copy to be sure something bad is not happening */
4554                         sin6->sin6_addr = ip6h->ip6_dst;
4555                         lsa6->sin6_addr = ip6h->ip6_src;
4556 #endif
4557
4558                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4559                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4560                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4561                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4562                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4563                         if (net) {
4564                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4565                                 /*
4566                                  * preserve the port and scope for link
4567                                  * local send
4568                                  */
4569                                 prev_scope = sin6->sin6_scope_id;
4570                                 prev_port = sin6->sin6_port;
4571                         }
4572                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4573                                 /* failed to prepend data, give up */
4574                                 sctp_m_freem(m);
4575                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4576                                 return (ENOMEM);
4577                         }
4578                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4579                         if (port) {
4580 #if defined(SCTP_WITH_NO_CSUM)
4581                                 SCTP_STAT_INCR(sctps_sendnocrc);
4582 #else
4583                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4584                                 SCTP_STAT_INCR(sctps_sendswcrc);
4585 #endif
4586                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4587                                         udp->uh_sum = 0xffff;
4588                                 }
4589                         } else {
4590 #if defined(SCTP_WITH_NO_CSUM)
4591                                 SCTP_STAT_INCR(sctps_sendnocrc);
4592 #else
4593                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4594                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4595                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4596 #endif
4597                         }
4598                         /* send it out. table id is taken from stcb */
4599 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4600                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4601                                 so = SCTP_INP_SO(inp);
4602                                 SCTP_SOCKET_UNLOCK(so, 0);
4603                         }
4604 #endif
4605 #ifdef SCTP_PACKET_LOGGING
4606                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4607                                 sctp_packet_log(o_pak);
4608 #endif
4609                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4610 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4611                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4612                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4613                                 SCTP_TCB_UNLOCK(stcb);
4614                                 SCTP_SOCKET_LOCK(so, 0);
4615                                 SCTP_TCB_LOCK(stcb);
4616                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4617                         }
4618 #endif
4619                         if (net) {
4620                                 /* for link local this must be done */
4621                                 sin6->sin6_scope_id = prev_scope;
4622                                 sin6->sin6_port = prev_port;
4623                         }
4624                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4625                         SCTP_STAT_INCR(sctps_sendpackets);
4626                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4627                         if (ret) {
4628                                 SCTP_STAT_INCR(sctps_senderrors);
4629                         }
4630                         if (net == NULL) {
4631                                 /* Now if we had a temp route free it */
4632                                 RO_RTFREE(ro);
4633                         } else {
4634                                 /*
4635                                  * PMTU check versus smallest asoc MTU goes
4636                                  * here
4637                                  */
4638                                 if (ro->ro_rt == NULL) {
4639                                         /* Route was freed */
4640                                         if (net->ro._s_addr &&
4641                                             net->src_addr_selected) {
4642                                                 sctp_free_ifa(net->ro._s_addr);
4643                                                 net->ro._s_addr = NULL;
4644                                         }
4645                                         net->src_addr_selected = 0;
4646                                 }
4647                                 if ((ro->ro_rt != NULL) &&
4648                                     (net->ro._s_addr)) {
4649                                         uint32_t mtu;
4650
4651                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4652                                         if (mtu &&
4653                                             (stcb->asoc.smallest_mtu > mtu)) {
4654                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4655                                                 net->mtu = mtu;
4656                                                 if (net->port) {
4657                                                         net->mtu -= sizeof(struct udphdr);
4658                                                 }
4659                                         }
4660                                 } else if (ifp) {
4661                                         if (ND_IFINFO(ifp)->linkmtu &&
4662                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4663                                                 sctp_mtu_size_reset(inp,
4664                                                     &stcb->asoc,
4665                                                     ND_IFINFO(ifp)->linkmtu);
4666                                         }
4667                                 }
4668                         }
4669                         return (ret);
4670                 }
4671 #endif
4672         default:
4673                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4674                     ((struct sockaddr *)to)->sa_family);
4675                 sctp_m_freem(m);
4676                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4677                 return (EFAULT);
4678         }
4679 }
4680
4681
4682 void
4683 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4684 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4685     SCTP_UNUSED
4686 #endif
4687 )
4688 {
4689         struct mbuf *m, *m_last;
4690         struct sctp_nets *net;
4691         struct sctp_init_chunk *init;
4692         struct sctp_supported_addr_param *sup_addr;
4693         struct sctp_adaptation_layer_indication *ali;
4694         struct sctp_supported_chunk_types_param *pr_supported;
4695         struct sctp_paramhdr *ph;
4696         int cnt_inits_to = 0;
4697         int ret;
4698         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4699
4700         /* INIT's always go to the primary (and usually ONLY address) */
4701         net = stcb->asoc.primary_destination;
4702         if (net == NULL) {
4703                 net = TAILQ_FIRST(&stcb->asoc.nets);
4704                 if (net == NULL) {
4705                         /* TSNH */
4706                         return;
4707                 }
4708                 /* we confirm any address we send an INIT to */
4709                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4710                 (void)sctp_set_primary_addr(stcb, NULL, net);
4711         } else {
4712                 /* we confirm any address we send an INIT to */
4713                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4714         }
4715         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4716 #ifdef INET6
4717         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4718                 /*
4719                  * special hook, if we are sending to link local it will not
4720                  * show up in our private address count.
4721                  */
4722                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4723                         cnt_inits_to = 1;
4724         }
4725 #endif
4726         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4727                 /* This case should not happen */
4728                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4729                 return;
4730         }
4731         /* start the INIT timer */
4732         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4733
4734         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4735         if (m == NULL) {
4736                 /* No memory, INIT timer will re-attempt. */
4737                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4738                 return;
4739         }
4740         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4741         padding_len = 0;
4742         /* Now lets put the chunk header in place */
4743         init = mtod(m, struct sctp_init_chunk *);
4744         /* now the chunk header */
4745         init->ch.chunk_type = SCTP_INITIATION;
4746         init->ch.chunk_flags = 0;
4747         /* fill in later from mbuf we build */
4748         init->ch.chunk_length = 0;
4749         /* place in my tag */
4750         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4751         /* set up some of the credits. */
4752         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4753             SCTP_MINIMAL_RWND));
4754         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4755         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4756         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4757
4758         /* Adaptation layer indication parameter */
4759         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4760                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4761                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4762                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4763                 ali->ph.param_length = htons(parameter_len);
4764                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4765                 chunk_len += parameter_len;
4766         }
4767         /* ECN parameter */
4768         if (stcb->asoc.ecn_supported == 1) {
4769                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4770                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4772                 ph->param_length = htons(parameter_len);
4773                 chunk_len += parameter_len;
4774         }
4775         /* PR-SCTP supported parameter */
4776         if (stcb->asoc.prsctp_supported == 1) {
4777                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4778                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4779                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4780                 ph->param_length = htons(parameter_len);
4781                 chunk_len += parameter_len;
4782         }
4783         /* Add NAT friendly parameter. */
4784         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4785                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4786                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4787                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4788                 ph->param_length = htons(parameter_len);
4789                 chunk_len += parameter_len;
4790         }
4791         /* And now tell the peer which extensions we support */
4792         num_ext = 0;
4793         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4794         if (stcb->asoc.prsctp_supported == 1) {
4795                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4796         }
4797         if (stcb->asoc.auth_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4799         }
4800         if (stcb->asoc.asconf_supported == 1) {
4801                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4802                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4803         }
4804         if (stcb->asoc.reconfig_supported == 1) {
4805                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4806         }
4807         if (stcb->asoc.nrsack_supported == 1) {
4808                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4809         }
4810         if (stcb->asoc.pktdrop_supported == 1) {
4811                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4812         }
4813         if (num_ext > 0) {
4814                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4815                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4816                 pr_supported->ph.param_length = htons(parameter_len);
4817                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4818                 chunk_len += parameter_len;
4819         }
4820         /* add authentication parameters */
4821         if (stcb->asoc.auth_supported) {
4822                 /* attach RANDOM parameter, if available */
4823                 if (stcb->asoc.authinfo.random != NULL) {
4824                         struct sctp_auth_random *randp;
4825
4826                         if (padding_len > 0) {
4827                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4828                                 chunk_len += padding_len;
4829                                 padding_len = 0;
4830                         }
4831                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4832                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4833                         /* random key already contains the header */
4834                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4835                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4836                         chunk_len += parameter_len;
4837                 }
4838                 /* add HMAC_ALGO parameter */
4839                 if (stcb->asoc.local_hmacs != NULL) {
4840                         struct sctp_auth_hmac_algo *hmacs;
4841
4842                         if (padding_len > 0) {
4843                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4844                                 chunk_len += padding_len;
4845                                 padding_len = 0;
4846                         }
4847                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4848                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4849                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4850                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4851                         hmacs->ph.param_length = htons(parameter_len);
4852                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4853                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4854                         chunk_len += parameter_len;
4855                 }
4856                 /* add CHUNKS parameter */
4857                 if (stcb->asoc.local_auth_chunks != NULL) {
4858                         struct sctp_auth_chunk_list *chunks;
4859
4860                         if (padding_len > 0) {
4861                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4862                                 chunk_len += padding_len;
4863                                 padding_len = 0;
4864                         }
4865                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4866                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4867                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4868                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4869                         chunks->ph.param_length = htons(parameter_len);
4870                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4871                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4872                         chunk_len += parameter_len;
4873                 }
4874         }
4875         /* now any cookie time extensions */
4876         if (stcb->asoc.cookie_preserve_req) {
4877                 struct sctp_cookie_perserve_param *cookie_preserve;
4878
4879                 if (padding_len > 0) {
4880                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4881                         chunk_len += padding_len;
4882                         padding_len = 0;
4883                 }
4884                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4885                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4886                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4887                 cookie_preserve->ph.param_length = htons(parameter_len);
4888                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4889                 stcb->asoc.cookie_preserve_req = 0;
4890                 chunk_len += parameter_len;
4891         }
4892         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4893                 uint8_t i;
4894
4895                 if (padding_len > 0) {
4896                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4897                         chunk_len += padding_len;
4898                         padding_len = 0;
4899                 }
4900                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4901                 if (stcb->asoc.scope.ipv4_addr_legal) {
4902                         parameter_len += (uint16_t) sizeof(uint16_t);
4903                 }
4904                 if (stcb->asoc.scope.ipv6_addr_legal) {
4905                         parameter_len += (uint16_t) sizeof(uint16_t);
4906                 }
4907                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4908                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4909                 sup_addr->ph.param_length = htons(parameter_len);
4910                 i = 0;
4911                 if (stcb->asoc.scope.ipv4_addr_legal) {
4912                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4913                 }
4914                 if (stcb->asoc.scope.ipv6_addr_legal) {
4915                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4916                 }
4917                 padding_len = 4 - 2 * i;
4918                 chunk_len += parameter_len;
4919         }
4920         SCTP_BUF_LEN(m) = chunk_len;
4921         /* now the addresses */
4922         /*
4923          * To optimize this we could put the scoping stuff into a structure
4924          * and remove the individual uint8's from the assoc structure. Then
4925          * we could just sifa in the address within the stcb. But for now
4926          * this is a quick hack to get the address stuff teased apart.
4927          */
4928         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4929             m, cnt_inits_to,
4930             &padding_len, &chunk_len);
4931
4932         init->ch.chunk_length = htons(chunk_len);
4933         if (padding_len > 0) {
4934                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4935                         sctp_m_freem(m);
4936                         return;
4937                 }
4938         }
4939         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4940         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4941             (struct sockaddr *)&net->ro._l_addr,
4942             m, 0, NULL, 0, 0, 0, 0,
4943             inp->sctp_lport, stcb->rport, htonl(0),
4944             net->port, NULL,
4945             0, 0,
4946             so_locked);
4947         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4948         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4949         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4950 }
4951
4952 struct mbuf *
4953 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4954     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4955 {
4956         /*
4957          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4958          * being equal to the beginning of the params i.e. (iphlen +
4959          * sizeof(struct sctp_init_msg) parse through the parameters to the
4960          * end of the mbuf verifying that all parameters are known.
4961          *
4962          * For unknown parameters build and return a mbuf with
4963          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4964          * processing this chunk stop, and set *abort_processing to 1.
4965          *
4966          * By having param_offset be pre-set to where parameters begin it is
4967          * hoped that this routine may be reused in the future by new
4968          * features.
4969          */
4970         struct sctp_paramhdr *phdr, params;
4971
4972         struct mbuf *mat, *op_err;
4973         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4974         int at, limit, pad_needed;
4975         uint16_t ptype, plen, padded_size;
4976         int err_at;
4977
4978         *abort_processing = 0;
4979         mat = in_initpkt;
4980         err_at = 0;
4981         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4982         at = param_offset;
4983         op_err = NULL;
4984         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4985         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4986         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4987                 ptype = ntohs(phdr->param_type);
4988                 plen = ntohs(phdr->param_length);
4989                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4990                         /* wacked parameter */
4991                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4992                         goto invalid_size;
4993                 }
4994                 limit -= SCTP_SIZE32(plen);
4995                 /*-
4996                  * All parameters for all chunks that we know/understand are
4997                  * listed here. We process them other places and make
4998                  * appropriate stop actions per the upper bits. However this
4999                  * is the generic routine processor's can call to get back
5000                  * an operr.. to either incorporate (init-ack) or send.
5001                  */
5002                 padded_size = SCTP_SIZE32(plen);
5003                 switch (ptype) {
5004                         /* Param's with variable size */
5005                 case SCTP_HEARTBEAT_INFO:
5006                 case SCTP_STATE_COOKIE:
5007                 case SCTP_UNRECOG_PARAM:
5008                 case SCTP_ERROR_CAUSE_IND:
5009                         /* ok skip fwd */
5010                         at += padded_size;
5011                         break;
5012                         /* Param's with variable size within a range */
5013                 case SCTP_CHUNK_LIST:
5014                 case SCTP_SUPPORTED_CHUNK_EXT:
5015                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5016                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5017                                 goto invalid_size;
5018                         }
5019                         at += padded_size;
5020                         break;
5021                 case SCTP_SUPPORTED_ADDRTYPE:
5022                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5023                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5024                                 goto invalid_size;
5025                         }
5026                         at += padded_size;
5027                         break;
5028                 case SCTP_RANDOM:
5029                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5030                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5031                                 goto invalid_size;
5032                         }
5033                         at += padded_size;
5034                         break;
5035                 case SCTP_SET_PRIM_ADDR:
5036                 case SCTP_DEL_IP_ADDRESS:
5037                 case SCTP_ADD_IP_ADDRESS:
5038                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5039                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5040                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5041                                 goto invalid_size;
5042                         }
5043                         at += padded_size;
5044                         break;
5045                         /* Param's with a fixed size */
5046                 case SCTP_IPV4_ADDRESS:
5047                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5048                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5049                                 goto invalid_size;
5050                         }
5051                         at += padded_size;
5052                         break;
5053                 case SCTP_IPV6_ADDRESS:
5054                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5055                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5056                                 goto invalid_size;
5057                         }
5058                         at += padded_size;
5059                         break;
5060                 case SCTP_COOKIE_PRESERVE:
5061                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5062                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5063                                 goto invalid_size;
5064                         }
5065                         at += padded_size;
5066                         break;
5067                 case SCTP_HAS_NAT_SUPPORT:
5068                         *nat_friendly = 1;
5069                         /* fall through */
5070                 case SCTP_PRSCTP_SUPPORTED:
5071                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5072                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5073                                 goto invalid_size;
5074                         }
5075                         at += padded_size;
5076                         break;
5077                 case SCTP_ECN_CAPABLE:
5078                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5079                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5080                                 goto invalid_size;
5081                         }
5082                         at += padded_size;
5083                         break;
5084                 case SCTP_ULP_ADAPTATION:
5085                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5086                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5087                                 goto invalid_size;
5088                         }
5089                         at += padded_size;
5090                         break;
5091                 case SCTP_SUCCESS_REPORT:
5092                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5093                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5094                                 goto invalid_size;
5095                         }
5096                         at += padded_size;
5097                         break;
5098                 case SCTP_HOSTNAME_ADDRESS:
5099                         {
5100                                 /* We can NOT handle HOST NAME addresses!! */
5101                                 int l_len;
5102
5103                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5104                                 *abort_processing = 1;
5105                                 if (op_err == NULL) {
5106                                         /* Ok need to try to get a mbuf */
5107 #ifdef INET6
5108                                         l_len = SCTP_MIN_OVERHEAD;
5109 #else
5110                                         l_len = SCTP_MIN_V4_OVERHEAD;
5111 #endif
5112                                         l_len += sizeof(struct sctp_chunkhdr);
5113                                         l_len += plen;
5114                                         l_len += sizeof(struct sctp_paramhdr);
5115                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5116                                         if (op_err) {
5117                                                 SCTP_BUF_LEN(op_err) = 0;
5118                                                 /*
5119                                                  * pre-reserve space for ip
5120                                                  * and sctp header  and
5121                                                  * chunk hdr
5122                                                  */
5123 #ifdef INET6
5124                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5125 #else
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5127 #endif
5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5130                                         }
5131                                 }
5132                                 if (op_err) {
5133                                         /* If we have space */
5134                                         struct sctp_paramhdr s;
5135
5136                                         if (err_at % 4) {
5137                                                 uint32_t cpthis = 0;
5138
5139                                                 pad_needed = 4 - (err_at % 4);
5140                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5141                                                 err_at += pad_needed;
5142                                         }
5143                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5144                                         s.param_length = htons(sizeof(s) + plen);
5145                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5146                                         err_at += sizeof(s);
5147                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5148                                         if (phdr == NULL) {
5149                                                 sctp_m_freem(op_err);
5150                                                 /*
5151                                                  * we are out of memory but
5152                                                  * we still need to have a
5153                                                  * look at what to do (the
5154                                                  * system is in trouble
5155                                                  * though).
5156                                                  */
5157                                                 return (NULL);
5158                                         }
5159                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5160                                 }
5161                                 return (op_err);
5162                                 break;
5163                         }
5164                 default:
5165                         /*
5166                          * we do not recognize the parameter figure out what
5167                          * we do.
5168                          */
5169                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5170                         if ((ptype & 0x4000) == 0x4000) {
5171                                 /* Report bit is set?? */
5172                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5173                                 if (op_err == NULL) {
5174                                         int l_len;
5175
5176                                         /* Ok need to try to get an mbuf */
5177 #ifdef INET6
5178                                         l_len = SCTP_MIN_OVERHEAD;
5179 #else
5180                                         l_len = SCTP_MIN_V4_OVERHEAD;
5181 #endif
5182                                         l_len += sizeof(struct sctp_chunkhdr);
5183                                         l_len += plen;
5184                                         l_len += sizeof(struct sctp_paramhdr);
5185                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5186                                         if (op_err) {
5187                                                 SCTP_BUF_LEN(op_err) = 0;
5188 #ifdef INET6
5189                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5190 #else
5191                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5192 #endif
5193                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5195                                         }
5196                                 }
5197                                 if (op_err) {
5198                                         /* If we have space */
5199                                         struct sctp_paramhdr s;
5200
5201                                         if (err_at % 4) {
5202                                                 uint32_t cpthis = 0;
5203
5204                                                 pad_needed = 4 - (err_at % 4);
5205                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5206                                                 err_at += pad_needed;
5207                                         }
5208                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5209                                         s.param_length = htons(sizeof(s) + plen);
5210                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5211                                         err_at += sizeof(s);
5212                                         if (plen > sizeof(tempbuf)) {
5213                                                 plen = sizeof(tempbuf);
5214                                         }
5215                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5216                                         if (phdr == NULL) {
5217                                                 sctp_m_freem(op_err);
5218                                                 /*
5219                                                  * we are out of memory but
5220                                                  * we still need to have a
5221                                                  * look at what to do (the
5222                                                  * system is in trouble
5223                                                  * though).
5224                                                  */
5225                                                 op_err = NULL;
5226                                                 goto more_processing;
5227                                         }
5228                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5229                                         err_at += plen;
5230                                 }
5231                         }
5232         more_processing:
5233                         if ((ptype & 0x8000) == 0x0000) {
5234                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5235                                 return (op_err);
5236                         } else {
5237                                 /* skip this chunk and continue processing */
5238                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5239                                 at += SCTP_SIZE32(plen);
5240                         }
5241                         break;
5242
5243                 }
5244                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5245         }
5246         return (op_err);
5247 invalid_size:
5248         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5249         *abort_processing = 1;
5250         if ((op_err == NULL) && phdr) {
5251                 int l_len;
5252
5253 #ifdef INET6
5254                 l_len = SCTP_MIN_OVERHEAD;
5255 #else
5256                 l_len = SCTP_MIN_V4_OVERHEAD;
5257 #endif
5258                 l_len += sizeof(struct sctp_chunkhdr);
5259                 l_len += (2 * sizeof(struct sctp_paramhdr));
5260                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5261                 if (op_err) {
5262                         SCTP_BUF_LEN(op_err) = 0;
5263 #ifdef INET6
5264                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5265 #else
5266                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5267 #endif
5268                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5269                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5270                 }
5271         }
5272         if ((op_err) && phdr) {
5273                 struct sctp_paramhdr s;
5274
5275                 if (err_at % 4) {
5276                         uint32_t cpthis = 0;
5277
5278                         pad_needed = 4 - (err_at % 4);
5279                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5280                         err_at += pad_needed;
5281                 }
5282                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5283                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5284                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5285                 err_at += sizeof(s);
5286                 /* Only copy back the p-hdr that caused the issue */
5287                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5288         }
5289         return (op_err);
5290 }
5291
5292 static int
5293 sctp_are_there_new_addresses(struct sctp_association *asoc,
5294     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5295 {
5296         /*
5297          * Given a INIT packet, look through the packet to verify that there
5298          * are NO new addresses. As we go through the parameters add reports
5299          * of any un-understood parameters that require an error.  Also we
5300          * must return (1) to drop the packet if we see a un-understood
5301          * parameter that tells us to drop the chunk.
5302          */
5303         struct sockaddr *sa_touse;
5304         struct sockaddr *sa;
5305         struct sctp_paramhdr *phdr, params;
5306         uint16_t ptype, plen;
5307         uint8_t fnd;
5308         struct sctp_nets *net;
5309
5310 #ifdef INET
5311         struct sockaddr_in sin4, *sa4;
5312
5313 #endif
5314 #ifdef INET6
5315         struct sockaddr_in6 sin6, *sa6;
5316
5317 #endif
5318
5319 #ifdef INET
5320         memset(&sin4, 0, sizeof(sin4));
5321         sin4.sin_family = AF_INET;
5322         sin4.sin_len = sizeof(sin4);
5323 #endif
5324 #ifdef INET6
5325         memset(&sin6, 0, sizeof(sin6));
5326         sin6.sin6_family = AF_INET6;
5327         sin6.sin6_len = sizeof(sin6);
5328 #endif
5329         /* First what about the src address of the pkt ? */
5330         fnd = 0;
5331         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5332                 sa = (struct sockaddr *)&net->ro._l_addr;
5333                 if (sa->sa_family == src->sa_family) {
5334 #ifdef INET
5335                         if (sa->sa_family == AF_INET) {
5336                                 struct sockaddr_in *src4;
5337
5338                                 sa4 = (struct sockaddr_in *)sa;
5339                                 src4 = (struct sockaddr_in *)src;
5340                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5341                                         fnd = 1;
5342                                         break;
5343                                 }
5344                         }
5345 #endif
5346 #ifdef INET6
5347                         if (sa->sa_family == AF_INET6) {
5348                                 struct sockaddr_in6 *src6;
5349
5350                                 sa6 = (struct sockaddr_in6 *)sa;
5351                                 src6 = (struct sockaddr_in6 *)src;
5352                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5353                                         fnd = 1;
5354                                         break;
5355                                 }
5356                         }
5357 #endif
5358                 }
5359         }
5360         if (fnd == 0) {
5361                 /* New address added! no need to look futher. */
5362                 return (1);
5363         }
5364         /* Ok so far lets munge through the rest of the packet */
5365         offset += sizeof(struct sctp_init_chunk);
5366         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5367         while (phdr) {
5368                 sa_touse = NULL;
5369                 ptype = ntohs(phdr->param_type);
5370                 plen = ntohs(phdr->param_length);
5371                 switch (ptype) {
5372 #ifdef INET
5373                 case SCTP_IPV4_ADDRESS:
5374                         {
5375                                 struct sctp_ipv4addr_param *p4, p4_buf;
5376
5377                                 phdr = sctp_get_next_param(in_initpkt, offset,
5378                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5379                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5380                                     phdr == NULL) {
5381                                         return (1);
5382                                 }
5383                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5384                                 sin4.sin_addr.s_addr = p4->addr;
5385                                 sa_touse = (struct sockaddr *)&sin4;
5386                                 break;
5387                         }
5388 #endif
5389 #ifdef INET6
5390                 case SCTP_IPV6_ADDRESS:
5391                         {
5392                                 struct sctp_ipv6addr_param *p6, p6_buf;
5393
5394                                 phdr = sctp_get_next_param(in_initpkt, offset,
5395                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5396                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5397                                     phdr == NULL) {
5398                                         return (1);
5399                                 }
5400                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5401                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5402                                     sizeof(p6->addr));
5403                                 sa_touse = (struct sockaddr *)&sin6;
5404                                 break;
5405                         }
5406 #endif
5407                 default:
5408                         sa_touse = NULL;
5409                         break;
5410                 }
5411                 if (sa_touse) {
5412                         /* ok, sa_touse points to one to check */
5413                         fnd = 0;
5414                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5415                                 sa = (struct sockaddr *)&net->ro._l_addr;
5416                                 if (sa->sa_family != sa_touse->sa_family) {
5417                                         continue;
5418                                 }
5419 #ifdef INET
5420                                 if (sa->sa_family == AF_INET) {
5421                                         sa4 = (struct sockaddr_in *)sa;
5422                                         if (sa4->sin_addr.s_addr ==
5423                                             sin4.sin_addr.s_addr) {
5424                                                 fnd = 1;
5425                                                 break;
5426                                         }
5427                                 }
5428 #endif
5429 #ifdef INET6
5430                                 if (sa->sa_family == AF_INET6) {
5431                                         sa6 = (struct sockaddr_in6 *)sa;
5432                                         if (SCTP6_ARE_ADDR_EQUAL(
5433                                             sa6, &sin6)) {
5434                                                 fnd = 1;
5435                                                 break;
5436                                         }
5437                                 }
5438 #endif
5439                         }
5440                         if (!fnd) {
5441                                 /* New addr added! no need to look further */
5442                                 return (1);
5443                         }
5444                 }
5445                 offset += SCTP_SIZE32(plen);
5446                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5447         }
5448         return (0);
5449 }
5450
5451 /*
5452  * Given a MBUF chain that was sent into us containing an INIT. Build a
5453  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5454  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5455  * message (i.e. the struct sctp_init_msg).
5456  */
5457 void
5458 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5459     struct mbuf *init_pkt, int iphlen, int offset,
5460     struct sockaddr *src, struct sockaddr *dst,
5461     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5462     uint8_t mflowtype, uint32_t mflowid,
5463     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5464 {
5465         struct sctp_association *asoc;
5466         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5467         struct sctp_init_ack_chunk *initack;
5468         struct sctp_adaptation_layer_indication *ali;
5469         struct sctp_supported_chunk_types_param *pr_supported;
5470         struct sctp_paramhdr *ph;
5471         union sctp_sockstore *over_addr;
5472         struct sctp_scoping scp;
5473
5474 #ifdef INET
5475         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5476         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5477         struct sockaddr_in *sin;
5478
5479 #endif
5480 #ifdef INET6
5481         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5482         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5483         struct sockaddr_in6 *sin6;
5484
5485 #endif
5486         struct sockaddr *to;
5487         struct sctp_state_cookie stc;
5488         struct sctp_nets *net = NULL;
5489         uint8_t *signature = NULL;
5490         int cnt_inits_to = 0;
5491         uint16_t his_limit, i_want;
5492         int abort_flag;
5493         int nat_friendly = 0;
5494         struct socket *so;
5495         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5496
5497         if (stcb) {
5498                 asoc = &stcb->asoc;
5499         } else {
5500                 asoc = NULL;
5501         }
5502         if ((asoc != NULL) &&
5503             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5504             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5505                 /* new addresses, out of here in non-cookie-wait states */
5506                 /*
5507                  * Send a ABORT, we don't add the new address error clause
5508                  * though we even set the T bit and copy in the 0 tag.. this
5509                  * looks no different than if no listener was present.
5510                  */
5511                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5512                     "Address added");
5513                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5514                     mflowtype, mflowid, inp->fibnum,
5515                     vrf_id, port);
5516                 return;
5517         }
5518         abort_flag = 0;
5519         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5520             (offset + sizeof(struct sctp_init_chunk)),
5521             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5522         if (abort_flag) {
5523 do_a_abort:
5524                 if (op_err == NULL) {
5525                         char msg[SCTP_DIAG_INFO_LEN];
5526
5527                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __FUNCTION__);
5528                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5529                             msg);
5530                 }
5531                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5532                     init_chk->init.initiate_tag, op_err,
5533                     mflowtype, mflowid, inp->fibnum,
5534                     vrf_id, port);
5535                 return;
5536         }
5537         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5538         if (m == NULL) {
5539                 /* No memory, INIT timer will re-attempt. */
5540                 if (op_err)
5541                         sctp_m_freem(op_err);
5542                 return;
5543         }
5544         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5545         padding_len = 0;
5546
5547         /*
5548          * We might not overwrite the identification[] completely and on
5549          * some platforms time_entered will contain some padding. Therefore
5550          * zero out the cookie to avoid putting uninitialized memory on the
5551          * wire.
5552          */
5553         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5554
5555         /* the time I built cookie */
5556         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5557
5558         /* populate any tie tags */
5559         if (asoc != NULL) {
5560                 /* unlock before tag selections */
5561                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5562                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5563                 stc.cookie_life = asoc->cookie_life;
5564                 net = asoc->primary_destination;
5565         } else {
5566                 stc.tie_tag_my_vtag = 0;
5567                 stc.tie_tag_peer_vtag = 0;
5568                 /* life I will award this cookie */
5569                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5570         }
5571
5572         /* copy in the ports for later check */
5573         stc.myport = sh->dest_port;
5574         stc.peerport = sh->src_port;
5575
5576         /*
5577          * If we wanted to honor cookie life extentions, we would add to
5578          * stc.cookie_life. For now we should NOT honor any extension
5579          */
5580         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5581         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5582                 stc.ipv6_addr_legal = 1;
5583                 if (SCTP_IPV6_V6ONLY(inp)) {
5584                         stc.ipv4_addr_legal = 0;
5585                 } else {
5586                         stc.ipv4_addr_legal = 1;
5587                 }
5588         } else {
5589                 stc.ipv6_addr_legal = 0;
5590                 stc.ipv4_addr_legal = 1;
5591         }
5592         stc.ipv4_scope = 0;
5593         if (net == NULL) {
5594                 to = src;
5595                 switch (dst->sa_family) {
5596 #ifdef INET
5597                 case AF_INET:
5598                         {
5599                                 /* lookup address */
5600                                 stc.address[0] = src4->sin_addr.s_addr;
5601                                 stc.address[1] = 0;
5602                                 stc.address[2] = 0;
5603                                 stc.address[3] = 0;
5604                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5605                                 /* local from address */
5606                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5607                                 stc.laddress[1] = 0;
5608                                 stc.laddress[2] = 0;
5609                                 stc.laddress[3] = 0;
5610                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5611                                 /* scope_id is only for v6 */
5612                                 stc.scope_id = 0;
5613                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5614                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5615                                         stc.ipv4_scope = 1;
5616                                 }
5617                                 /* Must use the address in this case */
5618                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5619                                         stc.loopback_scope = 1;
5620                                         stc.ipv4_scope = 1;
5621                                         stc.site_scope = 1;
5622                                         stc.local_scope = 0;
5623                                 }
5624                                 break;
5625                         }
5626 #endif
5627 #ifdef INET6
5628                 case AF_INET6:
5629                         {
5630                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5631                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5632                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5633                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5634                                         stc.loopback_scope = 1;
5635                                         stc.local_scope = 0;
5636                                         stc.site_scope = 1;
5637                                         stc.ipv4_scope = 1;
5638                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5639                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5640                                         /*
5641                                          * If the new destination or source
5642                                          * is a LINK_LOCAL we must have
5643                                          * common both site and local scope.
5644                                          * Don't set local scope though
5645                                          * since we must depend on the
5646                                          * source to be added implicitly. We
5647                                          * cannot assure just because we
5648                                          * share one link that all links are
5649                                          * common.
5650                                          */
5651                                         stc.local_scope = 0;
5652                                         stc.site_scope = 1;
5653                                         stc.ipv4_scope = 1;
5654                                         /*
5655                                          * we start counting for the private
5656                                          * address stuff at 1. since the
5657                                          * link local we source from won't
5658                                          * show up in our scoped count.
5659                                          */
5660                                         cnt_inits_to = 1;
5661                                         /*
5662                                          * pull out the scope_id from
5663                                          * incoming pkt
5664                                          */
5665                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5666                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5667                                         /*
5668                                          * If the new destination or source
5669                                          * is SITE_LOCAL then we must have
5670                                          * site scope in common.
5671                                          */
5672                                         stc.site_scope = 1;
5673                                 }
5674                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5675                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5676                                 break;
5677                         }
5678 #endif
5679                 default:
5680                         /* TSNH */
5681                         goto do_a_abort;
5682                         break;
5683                 }
5684         } else {
5685                 /* set the scope per the existing tcb */
5686
5687 #ifdef INET6
5688                 struct sctp_nets *lnet;
5689
5690 #endif
5691
5692                 stc.loopback_scope = asoc->scope.loopback_scope;
5693                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5694                 stc.site_scope = asoc->scope.site_scope;
5695                 stc.local_scope = asoc->scope.local_scope;
5696 #ifdef INET6
5697                 /* Why do we not consider IPv4 LL addresses? */
5698                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5699                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5700                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5701                                         /*
5702                                          * if we have a LL address, start
5703                                          * counting at 1.
5704                                          */
5705                                         cnt_inits_to = 1;
5706                                 }
5707                         }
5708                 }
5709 #endif
5710                 /* use the net pointer */
5711                 to = (struct sockaddr *)&net->ro._l_addr;
5712                 switch (to->sa_family) {
5713 #ifdef INET
5714                 case AF_INET:
5715                         sin = (struct sockaddr_in *)to;
5716                         stc.address[0] = sin->sin_addr.s_addr;
5717                         stc.address[1] = 0;
5718                         stc.address[2] = 0;
5719                         stc.address[3] = 0;
5720                         stc.addr_type = SCTP_IPV4_ADDRESS;
5721                         if (net->src_addr_selected == 0) {
5722                                 /*
5723                                  * strange case here, the INIT should have
5724                                  * did the selection.
5725                                  */
5726                                 net->ro._s_addr = sctp_source_address_selection(inp,
5727                                     stcb, (sctp_route_t *) & net->ro,
5728                                     net, 0, vrf_id);
5729                                 if (net->ro._s_addr == NULL)
5730                                         return;
5731
5732                                 net->src_addr_selected = 1;
5733
5734                         }
5735                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5736                         stc.laddress[1] = 0;
5737                         stc.laddress[2] = 0;
5738                         stc.laddress[3] = 0;
5739                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5740                         /* scope_id is only for v6 */
5741                         stc.scope_id = 0;
5742                         break;
5743 #endif
5744 #ifdef INET6
5745                 case AF_INET6:
5746                         sin6 = (struct sockaddr_in6 *)to;
5747                         memcpy(&stc.address, &sin6->sin6_addr,
5748                             sizeof(struct in6_addr));
5749                         stc.addr_type = SCTP_IPV6_ADDRESS;
5750                         stc.scope_id = sin6->sin6_scope_id;
5751                         if (net->src_addr_selected == 0) {
5752                                 /*
5753                                  * strange case here, the INIT should have
5754                                  * done the selection.
5755                                  */
5756                                 net->ro._s_addr = sctp_source_address_selection(inp,
5757                                     stcb, (sctp_route_t *) & net->ro,
5758                                     net, 0, vrf_id);
5759                                 if (net->ro._s_addr == NULL)
5760                                         return;
5761
5762                                 net->src_addr_selected = 1;
5763                         }
5764                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5765                             sizeof(struct in6_addr));
5766                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5767                         break;
5768 #endif
5769                 }
5770         }
5771         /* Now lets put the SCTP header in place */
5772         initack = mtod(m, struct sctp_init_ack_chunk *);
5773         /* Save it off for quick ref */
5774         stc.peers_vtag = init_chk->init.initiate_tag;
5775         /* who are we */
5776         memcpy(stc.identification, SCTP_VERSION_STRING,
5777             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5778         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5779         /* now the chunk header */
5780         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5781         initack->ch.chunk_flags = 0;
5782         /* fill in later from mbuf we build */
5783         initack->ch.chunk_length = 0;
5784         /* place in my tag */
5785         if ((asoc != NULL) &&
5786             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5787             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5788             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5789                 /* re-use the v-tags and init-seq here */
5790                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5791                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5792         } else {
5793                 uint32_t vtag, itsn;
5794
5795                 if (hold_inp_lock) {
5796                         SCTP_INP_INCR_REF(inp);
5797                         SCTP_INP_RUNLOCK(inp);
5798                 }
5799                 if (asoc) {
5800                         atomic_add_int(&asoc->refcnt, 1);
5801                         SCTP_TCB_UNLOCK(stcb);
5802         new_tag:
5803                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5804                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5805                                 /*
5806                                  * Got a duplicate vtag on some guy behind a
5807                                  * nat make sure we don't use it.
5808                                  */
5809                                 goto new_tag;
5810                         }
5811                         initack->init.initiate_tag = htonl(vtag);
5812                         /* get a TSN to use too */
5813                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5814                         initack->init.initial_tsn = htonl(itsn);
5815                         SCTP_TCB_LOCK(stcb);
5816                         atomic_add_int(&asoc->refcnt, -1);
5817                 } else {
5818                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5819                         initack->init.initiate_tag = htonl(vtag);
5820                         /* get a TSN to use too */
5821                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5822                 }
5823                 if (hold_inp_lock) {
5824                         SCTP_INP_RLOCK(inp);
5825                         SCTP_INP_DECR_REF(inp);
5826                 }
5827         }
5828         /* save away my tag to */
5829         stc.my_vtag = initack->init.initiate_tag;
5830
5831         /* set up some of the credits. */
5832         so = inp->sctp_socket;
5833         if (so == NULL) {
5834                 /* memory problem */
5835                 sctp_m_freem(m);
5836                 return;
5837         } else {
5838                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5839         }
5840         /* set what I want */
5841         his_limit = ntohs(init_chk->init.num_inbound_streams);
5842         /* choose what I want */
5843         if (asoc != NULL) {
5844                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5845                         i_want = asoc->streamoutcnt;
5846                 } else {
5847                         i_want = inp->sctp_ep.pre_open_stream_count;
5848                 }
5849         } else {
5850                 i_want = inp->sctp_ep.pre_open_stream_count;
5851         }
5852         if (his_limit < i_want) {
5853                 /* I Want more :< */
5854                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5855         } else {
5856                 /* I can have what I want :> */
5857                 initack->init.num_outbound_streams = htons(i_want);
5858         }
5859         /* tell him his limit. */
5860         initack->init.num_inbound_streams =
5861             htons(inp->sctp_ep.max_open_streams_intome);
5862
5863         /* adaptation layer indication parameter */
5864         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5865                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5866                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5867                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5868                 ali->ph.param_length = htons(parameter_len);
5869                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5870                 chunk_len += parameter_len;
5871         }
5872         /* ECN parameter */
5873         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5874             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5875                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5876                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5877                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5878                 ph->param_length = htons(parameter_len);
5879                 chunk_len += parameter_len;
5880         }
5881         /* PR-SCTP supported parameter */
5882         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5883             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5884                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5885                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5886                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5887                 ph->param_length = htons(parameter_len);
5888                 chunk_len += parameter_len;
5889         }
5890         /* Add NAT friendly parameter */
5891         if (nat_friendly) {
5892                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5893                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5894                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5895                 ph->param_length = htons(parameter_len);
5896                 chunk_len += parameter_len;
5897         }
5898         /* And now tell the peer which extensions we support */
5899         num_ext = 0;
5900         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5901         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5902             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5903                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5904         }
5905         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5906             ((asoc == NULL) && (inp->auth_supported == 1))) {
5907                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5908         }
5909         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5910             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5911                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5912                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5913         }
5914         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5915             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5916                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5917         }
5918         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5919             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5920                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5921         }
5922         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5923             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5924                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5925         }
5926         if (num_ext > 0) {
5927                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5928                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5929                 pr_supported->ph.param_length = htons(parameter_len);
5930                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5931                 chunk_len += parameter_len;
5932         }
5933         /* add authentication parameters */
5934         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5935             ((asoc == NULL) && (inp->auth_supported == 1))) {
5936                 struct sctp_auth_random *randp;
5937                 struct sctp_auth_hmac_algo *hmacs;
5938                 struct sctp_auth_chunk_list *chunks;
5939
5940                 if (padding_len > 0) {
5941                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5942                         chunk_len += padding_len;
5943                         padding_len = 0;
5944                 }
5945                 /* generate and add RANDOM parameter */
5946                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5947                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5948                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5949                 randp->ph.param_type = htons(SCTP_RANDOM);
5950                 randp->ph.param_length = htons(parameter_len);
5951                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5952                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5953                 chunk_len += parameter_len;
5954
5955                 if (padding_len > 0) {
5956                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5957                         chunk_len += padding_len;
5958                         padding_len = 0;
5959                 }
5960                 /* add HMAC_ALGO parameter */
5961                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5962                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
5963                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5964                     (uint8_t *) hmacs->hmac_ids);
5965                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5966                 hmacs->ph.param_length = htons(parameter_len);
5967                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5968                 chunk_len += parameter_len;
5969
5970                 if (padding_len > 0) {
5971                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5972                         chunk_len += padding_len;
5973                         padding_len = 0;
5974                 }
5975                 /* add CHUNKS parameter */
5976                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
5977                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
5978                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5979                     chunks->chunk_types);
5980                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5981                 chunks->ph.param_length = htons(parameter_len);
5982                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5983                 chunk_len += parameter_len;
5984         }
5985         SCTP_BUF_LEN(m) = chunk_len;
5986         m_last = m;
5987         /* now the addresses */
5988         /*
5989          * To optimize this we could put the scoping stuff into a structure
5990          * and remove the individual uint8's from the stc structure. Then we
5991          * could just sifa in the address within the stc.. but for now this
5992          * is a quick hack to get the address stuff teased apart.
5993          */
5994         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5995         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5996         scp.loopback_scope = stc.loopback_scope;
5997         scp.ipv4_local_scope = stc.ipv4_scope;
5998         scp.local_scope = stc.local_scope;
5999         scp.site_scope = stc.site_scope;
6000         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6001             cnt_inits_to,
6002             &padding_len, &chunk_len);
6003         /* padding_len can only be positive, if no addresses have been added */
6004         if (padding_len > 0) {
6005                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6006                 chunk_len += padding_len;
6007                 SCTP_BUF_LEN(m) += padding_len;
6008                 padding_len = 0;
6009         }
6010         /* tack on the operational error if present */
6011         if (op_err) {
6012                 parameter_len = 0;
6013                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6014                         parameter_len += SCTP_BUF_LEN(m_tmp);
6015                 }
6016                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6017                 SCTP_BUF_NEXT(m_last) = op_err;
6018                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6019                         m_last = SCTP_BUF_NEXT(m_last);
6020                 }
6021                 chunk_len += parameter_len;
6022         }
6023         if (padding_len > 0) {
6024                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6025                 if (m_last == NULL) {
6026                         /* Houston we have a problem, no space */
6027                         sctp_m_freem(m);
6028                         return;
6029                 }
6030                 chunk_len += padding_len;
6031                 padding_len = 0;
6032         }
6033         /* Now we must build a cookie */
6034         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6035         if (m_cookie == NULL) {
6036                 /* memory problem */
6037                 sctp_m_freem(m);
6038                 return;
6039         }
6040         /* Now append the cookie to the end and update the space/size */
6041         SCTP_BUF_NEXT(m_last) = m_cookie;
6042         parameter_len = 0;
6043         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6044                 parameter_len += SCTP_BUF_LEN(m_tmp);
6045                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6046                         m_last = m_tmp;
6047                 }
6048         }
6049         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6050         chunk_len += parameter_len;
6051
6052         /*
6053          * Place in the size, but we don't include the last pad (if any) in
6054          * the INIT-ACK.
6055          */
6056         initack->ch.chunk_length = htons(chunk_len);
6057
6058         /*
6059          * Time to sign the cookie, we don't sign over the cookie signature
6060          * though thus we set trailer.
6061          */
6062         (void)sctp_hmac_m(SCTP_HMAC,
6063             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6064             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6065             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6066         /*
6067          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6068          * here since the timer will drive a retranmission.
6069          */
6070         if (padding_len > 0) {
6071                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6072                         sctp_m_freem(m);
6073                         return;
6074                 }
6075         }
6076         if (stc.loopback_scope) {
6077                 over_addr = (union sctp_sockstore *)dst;
6078         } else {
6079                 over_addr = NULL;
6080         }
6081
6082         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6083             0, 0,
6084             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6085             port, over_addr,
6086             mflowtype, mflowid,
6087             SCTP_SO_NOT_LOCKED);
6088         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6089 }
6090
6091
6092 static void
6093 sctp_prune_prsctp(struct sctp_tcb *stcb,
6094     struct sctp_association *asoc,
6095     struct sctp_sndrcvinfo *srcv,
6096     int dataout)
6097 {
6098         int freed_spc = 0;
6099         struct sctp_tmit_chunk *chk, *nchk;
6100
6101         SCTP_TCB_LOCK_ASSERT(stcb);
6102         if ((asoc->prsctp_supported) &&
6103             (asoc->sent_queue_cnt_removeable > 0)) {
6104                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6105                         /*
6106                          * Look for chunks marked with the PR_SCTP flag AND
6107                          * the buffer space flag. If the one being sent is
6108                          * equal or greater priority then purge the old one
6109                          * and free some space.
6110                          */
6111                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6112                                 /*
6113                                  * This one is PR-SCTP AND buffer space
6114                                  * limited type
6115                                  */
6116                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6117                                         /*
6118                                          * Lower numbers equates to higher
6119                                          * priority so if the one we are
6120                                          * looking at has a larger or equal
6121                                          * priority we want to drop the data
6122                                          * and NOT retransmit it.
6123                                          */
6124                                         if (chk->data) {
6125                                                 /*
6126                                                  * We release the book_size
6127                                                  * if the mbuf is here
6128                                                  */
6129                                                 int ret_spc;
6130                                                 uint8_t sent;
6131
6132                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6133                                                         sent = 1;
6134                                                 else
6135                                                         sent = 0;
6136                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6137                                                     sent,
6138                                                     SCTP_SO_LOCKED);
6139                                                 freed_spc += ret_spc;
6140                                                 if (freed_spc >= dataout) {
6141                                                         return;
6142                                                 }
6143                                         }       /* if chunk was present */
6144                                 }       /* if of sufficent priority */
6145                         }       /* if chunk has enabled */
6146                 }               /* tailqforeach */
6147
6148                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6149                         /* Here we must move to the sent queue and mark */
6150                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6151                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6152                                         if (chk->data) {
6153                                                 /*
6154                                                  * We release the book_size
6155                                                  * if the mbuf is here
6156                                                  */
6157                                                 int ret_spc;
6158
6159                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6160                                                     0, SCTP_SO_LOCKED);
6161
6162                                                 freed_spc += ret_spc;
6163                                                 if (freed_spc >= dataout) {
6164                                                         return;
6165                                                 }
6166                                         }       /* end if chk->data */
6167                                 }       /* end if right class */
6168                         }       /* end if chk pr-sctp */
6169                 }               /* tailqforeachsafe (chk) */
6170         }                       /* if enabled in asoc */
6171 }
6172
6173 int
6174 sctp_get_frag_point(struct sctp_tcb *stcb,
6175     struct sctp_association *asoc)
6176 {
6177         int siz, ovh;
6178
6179         /*
6180          * For endpoints that have both v6 and v4 addresses we must reserve
6181          * room for the ipv6 header, for those that are only dealing with V4
6182          * we use a larger frag point.
6183          */
6184         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6185                 ovh = SCTP_MED_OVERHEAD;
6186         } else {
6187                 ovh = SCTP_MED_V4_OVERHEAD;
6188         }
6189
6190         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6191                 siz = asoc->smallest_mtu - ovh;
6192         else
6193                 siz = (stcb->asoc.sctp_frag_point - ovh);
6194         /*
6195          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6196          */
6197         /* A data chunk MUST fit in a cluster */
6198         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6199         /* } */
6200
6201         /* adjust for an AUTH chunk if DATA requires auth */
6202         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6203                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6204
6205         if (siz % 4) {
6206                 /* make it an even word boundary please */
6207                 siz -= (siz % 4);
6208         }
6209         return (siz);
6210 }
6211
6212 static void
6213 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6214 {
6215         /*
6216          * We assume that the user wants PR_SCTP_TTL if the user provides a
6217          * positive lifetime but does not specify any PR_SCTP policy.
6218          */
6219         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6220                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6221         } else if (sp->timetolive > 0) {
6222                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6223                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6224         } else {
6225                 return;
6226         }
6227         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6228         case CHUNK_FLAGS_PR_SCTP_BUF:
6229                 /*
6230                  * Time to live is a priority stored in tv_sec when doing
6231                  * the buffer drop thing.
6232                  */
6233                 sp->ts.tv_sec = sp->timetolive;
6234                 sp->ts.tv_usec = 0;
6235                 break;
6236         case CHUNK_FLAGS_PR_SCTP_TTL:
6237                 {
6238                         struct timeval tv;
6239
6240                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6241                         tv.tv_sec = sp->timetolive / 1000;
6242                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6243                         /*
6244                          * TODO sctp_constants.h needs alternative time
6245                          * macros when _KERNEL is undefined.
6246                          */
6247                         timevaladd(&sp->ts, &tv);
6248                 }
6249                 break;
6250         case CHUNK_FLAGS_PR_SCTP_RTX:
6251                 /*
6252                  * Time to live is a the number or retransmissions stored in
6253                  * tv_sec.
6254                  */
6255                 sp->ts.tv_sec = sp->timetolive;
6256                 sp->ts.tv_usec = 0;
6257                 break;
6258         default:
6259                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6260                     "Unknown PR_SCTP policy %u.\n",
6261                     PR_SCTP_POLICY(sp->sinfo_flags));
6262                 break;
6263         }
6264 }
6265
6266 static int
6267 sctp_msg_append(struct sctp_tcb *stcb,
6268     struct sctp_nets *net,
6269     struct mbuf *m,
6270     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6271 {
6272         int error = 0;
6273         struct mbuf *at;
6274         struct sctp_stream_queue_pending *sp = NULL;
6275         struct sctp_stream_out *strm;
6276
6277         /*
6278          * Given an mbuf chain, put it into the association send queue and
6279          * place it on the wheel
6280          */
6281         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6282                 /* Invalid stream number */
6283                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6284                 error = EINVAL;
6285                 goto out_now;
6286         }
6287         if ((stcb->asoc.stream_locked) &&
6288             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6289                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6290                 error = EINVAL;
6291                 goto out_now;
6292         }
6293         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6294         /* Now can we send this? */
6295         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6296             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6297             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6298             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6299                 /* got data while shutting down */
6300                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6301                 error = ECONNRESET;
6302                 goto out_now;
6303         }
6304         sctp_alloc_a_strmoq(stcb, sp);
6305         if (sp == NULL) {
6306                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6307                 error = ENOMEM;
6308                 goto out_now;
6309         }
6310         sp->sinfo_flags = srcv->sinfo_flags;
6311         sp->timetolive = srcv->sinfo_timetolive;
6312         sp->ppid = srcv->sinfo_ppid;
6313         sp->context = srcv->sinfo_context;
6314         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6315                 sp->net = net;
6316                 atomic_add_int(&sp->net->ref_count, 1);
6317         } else {
6318                 sp->net = NULL;
6319         }
6320         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6321         sp->stream = srcv->sinfo_stream;
6322         sp->msg_is_complete = 1;
6323         sp->sender_all_done = 1;
6324         sp->some_taken = 0;
6325         sp->data = m;
6326         sp->tail_mbuf = NULL;
6327         sctp_set_prsctp_policy(sp);
6328         /*
6329          * We could in theory (for sendall) sifa the length in, but we would
6330          * still have to hunt through the chain since we need to setup the
6331          * tail_mbuf
6332          */
6333         sp->length = 0;
6334         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6335                 if (SCTP_BUF_NEXT(at) == NULL)
6336                         sp->tail_mbuf = at;
6337                 sp->length += SCTP_BUF_LEN(at);
6338         }
6339         if (srcv->sinfo_keynumber_valid) {
6340                 sp->auth_keyid = srcv->sinfo_keynumber;
6341         } else {
6342                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6343         }
6344         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6345                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6346                 sp->holds_key_ref = 1;
6347         }
6348         if (hold_stcb_lock == 0) {
6349                 SCTP_TCB_SEND_LOCK(stcb);
6350         }
6351         sctp_snd_sb_alloc(stcb, sp->length);
6352         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6353         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6354         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6355         m = NULL;
6356         if (hold_stcb_lock == 0) {
6357                 SCTP_TCB_SEND_UNLOCK(stcb);
6358         }
6359 out_now:
6360         if (m) {
6361                 sctp_m_freem(m);
6362         }
6363         return (error);
6364 }
6365
6366
6367 static struct mbuf *
6368 sctp_copy_mbufchain(struct mbuf *clonechain,
6369     struct mbuf *outchain,
6370     struct mbuf **endofchain,
6371     int can_take_mbuf,
6372     int sizeofcpy,
6373     uint8_t copy_by_ref)
6374 {
6375         struct mbuf *m;
6376         struct mbuf *appendchain;
6377         caddr_t cp;
6378         int len;
6379
6380         if (endofchain == NULL) {
6381                 /* error */
6382 error_out:
6383                 if (outchain)
6384                         sctp_m_freem(outchain);
6385                 return (NULL);
6386         }
6387         if (can_take_mbuf) {
6388                 appendchain = clonechain;
6389         } else {
6390                 if (!copy_by_ref &&
6391                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6392                     ) {
6393                         /* Its not in a cluster */
6394                         if (*endofchain == NULL) {
6395                                 /* lets get a mbuf cluster */
6396                                 if (outchain == NULL) {
6397                                         /* This is the general case */
6398                         new_mbuf:
6399                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6400                                         if (outchain == NULL) {
6401                                                 goto error_out;
6402                                         }
6403                                         SCTP_BUF_LEN(outchain) = 0;
6404                                         *endofchain = outchain;
6405                                         /* get the prepend space */
6406                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6407                                 } else {
6408                                         /*
6409                                          * We really should not get a NULL
6410                                          * in endofchain
6411                                          */
6412                                         /* find end */
6413                                         m = outchain;
6414                                         while (m) {
6415                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6416                                                         *endofchain = m;
6417                                                         break;
6418                                                 }
6419                                                 m = SCTP_BUF_NEXT(m);
6420                                         }
6421                                         /* sanity */
6422                                         if (*endofchain == NULL) {
6423                                                 /*
6424                                                  * huh, TSNH XXX maybe we
6425                                                  * should panic
6426                                                  */
6427                                                 sctp_m_freem(outchain);
6428                                                 goto new_mbuf;
6429                                         }
6430                                 }
6431                                 /* get the new end of length */
6432                                 len = M_TRAILINGSPACE(*endofchain);
6433                         } else {
6434                                 /* how much is left at the end? */
6435                                 len = M_TRAILINGSPACE(*endofchain);
6436                         }
6437                         /* Find the end of the data, for appending */
6438                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6439
6440                         /* Now lets copy it out */
6441                         if (len >= sizeofcpy) {
6442                                 /* It all fits, copy it in */
6443                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6444                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6445                         } else {
6446                                 /* fill up the end of the chain */
6447                                 if (len > 0) {
6448                                         m_copydata(clonechain, 0, len, cp);
6449                                         SCTP_BUF_LEN((*endofchain)) += len;
6450                                         /* now we need another one */
6451                                         sizeofcpy -= len;
6452                                 }
6453                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6454                                 if (m == NULL) {
6455                                         /* We failed */
6456                                         goto error_out;
6457                                 }
6458                                 SCTP_BUF_NEXT((*endofchain)) = m;
6459                                 *endofchain = m;
6460                                 cp = mtod((*endofchain), caddr_t);
6461                                 m_copydata(clonechain, len, sizeofcpy, cp);
6462                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6463                         }
6464                         return (outchain);
6465                 } else {
6466                         /* copy the old fashion way */
6467                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6468 #ifdef SCTP_MBUF_LOGGING
6469                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6470                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6471                         }
6472 #endif
6473                 }
6474         }
6475         if (appendchain == NULL) {
6476                 /* error */
6477                 if (outchain)
6478                         sctp_m_freem(outchain);
6479                 return (NULL);
6480         }
6481         if (outchain) {
6482                 /* tack on to the end */
6483                 if (*endofchain != NULL) {
6484                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6485                 } else {
6486                         m = outchain;
6487                         while (m) {
6488                                 if (SCTP_BUF_NEXT(m) == NULL) {
6489                                         SCTP_BUF_NEXT(m) = appendchain;
6490                                         break;
6491                                 }
6492                                 m = SCTP_BUF_NEXT(m);
6493                         }
6494                 }
6495                 /*
6496                  * save off the end and update the end-chain postion
6497                  */
6498                 m = appendchain;
6499                 while (m) {
6500                         if (SCTP_BUF_NEXT(m) == NULL) {
6501                                 *endofchain = m;
6502                                 break;
6503                         }
6504                         m = SCTP_BUF_NEXT(m);
6505                 }
6506                 return (outchain);
6507         } else {
6508                 /* save off the end and update the end-chain postion */
6509                 m = appendchain;
6510                 while (m) {
6511                         if (SCTP_BUF_NEXT(m) == NULL) {
6512                                 *endofchain = m;
6513                                 break;
6514                         }
6515                         m = SCTP_BUF_NEXT(m);
6516                 }
6517                 return (appendchain);
6518         }
6519 }
6520
6521 static int
6522 sctp_med_chunk_output(struct sctp_inpcb *inp,
6523     struct sctp_tcb *stcb,
6524     struct sctp_association *asoc,
6525     int *num_out,
6526     int *reason_code,
6527     int control_only, int from_where,
6528     struct timeval *now, int *now_filled, int frag_point, int so_locked
6529 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6530     SCTP_UNUSED
6531 #endif
6532 );
6533
6534 static void
6535 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6536     uint32_t val SCTP_UNUSED)
6537 {
6538         struct sctp_copy_all *ca;
6539         struct mbuf *m;
6540         int ret = 0;
6541         int added_control = 0;
6542         int un_sent, do_chunk_output = 1;
6543         struct sctp_association *asoc;
6544         struct sctp_nets *net;
6545
6546         ca = (struct sctp_copy_all *)ptr;
6547         if (ca->m == NULL) {
6548                 return;
6549         }
6550         if (ca->inp != inp) {
6551                 /* TSNH */
6552                 return;
6553         }
6554         if (ca->sndlen > 0) {
6555                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6556                 if (m == NULL) {
6557                         /* can't copy so we are done */
6558                         ca->cnt_failed++;
6559                         return;
6560                 }
6561 #ifdef SCTP_MBUF_LOGGING
6562                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6563                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6564                 }
6565 #endif
6566         } else {
6567                 m = NULL;
6568         }
6569         SCTP_TCB_LOCK_ASSERT(stcb);
6570         if (stcb->asoc.alternate) {
6571                 net = stcb->asoc.alternate;
6572         } else {
6573                 net = stcb->asoc.primary_destination;
6574         }
6575         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6576                 /* Abort this assoc with m as the user defined reason */
6577                 if (m != NULL) {
6578                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6579                 } else {
6580                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6581                             0, M_NOWAIT, 1, MT_DATA);
6582                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6583                 }
6584                 if (m != NULL) {
6585                         struct sctp_paramhdr *ph;
6586
6587                         ph = mtod(m, struct sctp_paramhdr *);
6588                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6589                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6590                 }
6591                 /*
6592                  * We add one here to keep the assoc from dis-appearing on
6593                  * us.
6594                  */
6595                 atomic_add_int(&stcb->asoc.refcnt, 1);
6596                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6597                 /*
6598                  * sctp_abort_an_association calls sctp_free_asoc() free
6599                  * association will NOT free it since we incremented the
6600                  * refcnt .. we do this to prevent it being freed and things
6601                  * getting tricky since we could end up (from free_asoc)
6602                  * calling inpcb_free which would get a recursive lock call
6603                  * to the iterator lock.. But as a consequence of that the
6604                  * stcb will return to us un-locked.. since free_asoc
6605                  * returns with either no TCB or the TCB unlocked, we must
6606                  * relock.. to unlock in the iterator timer :-0
6607                  */
6608                 SCTP_TCB_LOCK(stcb);
6609                 atomic_add_int(&stcb->asoc.refcnt, -1);
6610                 goto no_chunk_output;
6611         } else {
6612                 if (m) {
6613                         ret = sctp_msg_append(stcb, net, m,
6614                             &ca->sndrcv, 1);
6615                 }
6616                 asoc = &stcb->asoc;
6617                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6618                         /* shutdown this assoc */
6619                         int cnt;
6620
6621                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6622
6623                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6624                             TAILQ_EMPTY(&asoc->sent_queue) &&
6625                             (cnt == 0)) {
6626                                 if (asoc->locked_on_sending) {
6627                                         goto abort_anyway;
6628                                 }
6629                                 /*
6630                                  * there is nothing queued to send, so I'm
6631                                  * done...
6632                                  */
6633                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6634                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6635                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6636                                         /*
6637                                          * only send SHUTDOWN the first time
6638                                          * through
6639                                          */
6640                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6641                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6642                                         }
6643                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6644                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6645                                         sctp_stop_timers_for_shutdown(stcb);
6646                                         sctp_send_shutdown(stcb, net);
6647                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6648                                             net);
6649                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6650                                             asoc->primary_destination);
6651                                         added_control = 1;
6652                                         do_chunk_output = 0;
6653                                 }
6654                         } else {
6655                                 /*
6656                                  * we still got (or just got) data to send,
6657                                  * so set SHUTDOWN_PENDING
6658                                  */
6659                                 /*
6660                                  * XXX sockets draft says that SCTP_EOF
6661                                  * should be sent with no data.  currently,
6662                                  * we will allow user data to be sent first
6663                                  * and move to SHUTDOWN-PENDING
6664                                  */
6665                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6666                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6667                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6668                                         if (asoc->locked_on_sending) {
6669                                                 /*
6670                                                  * Locked to send out the
6671                                                  * data
6672                                                  */
6673                                                 struct sctp_stream_queue_pending *sp;
6674
6675                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6676                                                 if (sp) {
6677                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6678                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6679                                                 }
6680                                         }
6681                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6682                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6683                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6684                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6685                                                 struct mbuf *op_err;
6686                                                 char msg[SCTP_DIAG_INFO_LEN];
6687
6688                                 abort_anyway:
6689                                                 snprintf(msg, sizeof(msg),
6690                                                     "%s:%d at %s", __FILE__, __LINE__, __FUNCTION__);
6691                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6692                                                     msg);
6693                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6694                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6695                                                     op_err, SCTP_SO_NOT_LOCKED);
6696                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6697                                                 goto no_chunk_output;
6698                                         }
6699                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6700                                             asoc->primary_destination);
6701                                 }
6702                         }
6703
6704                 }
6705         }
6706         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6707             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6708
6709         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6710             (stcb->asoc.total_flight > 0) &&
6711             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6712                 do_chunk_output = 0;
6713         }
6714         if (do_chunk_output)
6715                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6716         else if (added_control) {
6717                 int num_out, reason, now_filled = 0;
6718                 struct timeval now;
6719                 int frag_point;
6720
6721                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6722                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6723                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6724         }
6725 no_chunk_output:
6726         if (ret) {
6727                 ca->cnt_failed++;
6728         } else {
6729                 ca->cnt_sent++;
6730         }
6731 }
6732
6733 static void
6734 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6735 {
6736         struct sctp_copy_all *ca;
6737
6738         ca = (struct sctp_copy_all *)ptr;
6739         /*
6740          * Do a notify here? Kacheong suggests that the notify be done at
6741          * the send time.. so you would push up a notification if any send
6742          * failed. Don't know if this is feasable since the only failures we
6743          * have is "memory" related and if you cannot get an mbuf to send
6744          * the data you surely can't get an mbuf to send up to notify the
6745          * user you can't send the data :->
6746          */
6747
6748         /* now free everything */
6749         sctp_m_freem(ca->m);
6750         SCTP_FREE(ca, SCTP_M_COPYAL);
6751 }
6752
6753 static struct mbuf *
6754 sctp_copy_out_all(struct uio *uio, int len)
6755 {
6756         struct mbuf *ret, *at;
6757         int left, willcpy, cancpy, error;
6758
6759         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6760         if (ret == NULL) {
6761                 /* TSNH */
6762                 return (NULL);
6763         }
6764         left = len;
6765         SCTP_BUF_LEN(ret) = 0;
6766         /* save space for the data chunk header */
6767         cancpy = M_TRAILINGSPACE(ret);
6768         willcpy = min(cancpy, left);
6769         at = ret;
6770         while (left > 0) {
6771                 /* Align data to the end */
6772                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6773                 if (error) {
6774         err_out_now:
6775                         sctp_m_freem(at);
6776                         return (NULL);
6777                 }
6778                 SCTP_BUF_LEN(at) = willcpy;
6779                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6780                 left -= willcpy;
6781                 if (left > 0) {
6782                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6783                         if (SCTP_BUF_NEXT(at) == NULL) {
6784                                 goto err_out_now;
6785                         }
6786                         at = SCTP_BUF_NEXT(at);
6787                         SCTP_BUF_LEN(at) = 0;
6788                         cancpy = M_TRAILINGSPACE(at);
6789                         willcpy = min(cancpy, left);
6790                 }
6791         }
6792         return (ret);
6793 }
6794
6795 static int
6796 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6797     struct sctp_sndrcvinfo *srcv)
6798 {
6799         int ret;
6800         struct sctp_copy_all *ca;
6801
6802         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6803             SCTP_M_COPYAL);
6804         if (ca == NULL) {
6805                 sctp_m_freem(m);
6806                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6807                 return (ENOMEM);
6808         }
6809         memset(ca, 0, sizeof(struct sctp_copy_all));
6810
6811         ca->inp = inp;
6812         if (srcv) {
6813                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6814         }
6815         /*
6816          * take off the sendall flag, it would be bad if we failed to do
6817          * this :-0
6818          */
6819         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6820         /* get length and mbuf chain */
6821         if (uio) {
6822                 ca->sndlen = uio->uio_resid;
6823                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6824                 if (ca->m == NULL) {
6825                         SCTP_FREE(ca, SCTP_M_COPYAL);
6826                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6827                         return (ENOMEM);
6828                 }
6829         } else {
6830                 /* Gather the length of the send */
6831                 struct mbuf *mat;
6832
6833                 ca->sndlen = 0;
6834                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6835                         ca->sndlen += SCTP_BUF_LEN(mat);
6836                 }
6837         }
6838         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6839             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6840             SCTP_ASOC_ANY_STATE,
6841             (void *)ca, 0,
6842             sctp_sendall_completes, inp, 1);
6843         if (ret) {
6844                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6845                 SCTP_FREE(ca, SCTP_M_COPYAL);
6846                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6847                 return (EFAULT);
6848         }
6849         return (0);
6850 }
6851
6852
6853 void
6854 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6855 {
6856         struct sctp_tmit_chunk *chk, *nchk;
6857
6858         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6859                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6860                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6861                         if (chk->data) {
6862                                 sctp_m_freem(chk->data);
6863                                 chk->data = NULL;
6864                         }
6865                         asoc->ctrl_queue_cnt--;
6866                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6867                 }
6868         }
6869 }
6870
6871 void
6872 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6873 {
6874         struct sctp_association *asoc;
6875         struct sctp_tmit_chunk *chk, *nchk;
6876         struct sctp_asconf_chunk *acp;
6877
6878         asoc = &stcb->asoc;
6879         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6880                 /* find SCTP_ASCONF chunk in queue */
6881                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6882                         if (chk->data) {
6883                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6884                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6885                                         /* Not Acked yet */
6886                                         break;
6887                                 }
6888                         }
6889                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6890                         if (chk->data) {
6891                                 sctp_m_freem(chk->data);
6892                                 chk->data = NULL;
6893                         }
6894                         asoc->ctrl_queue_cnt--;
6895                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6896                 }
6897         }
6898 }
6899
6900
6901 static void
6902 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6903     struct sctp_association *asoc,
6904     struct sctp_tmit_chunk **data_list,
6905     int bundle_at,
6906     struct sctp_nets *net)
6907 {
6908         int i;
6909         struct sctp_tmit_chunk *tp1;
6910
6911         for (i = 0; i < bundle_at; i++) {
6912                 /* off of the send queue */
6913                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6914                 asoc->send_queue_cnt--;
6915                 if (i > 0) {
6916                         /*
6917                          * Any chunk NOT 0 you zap the time chunk 0 gets
6918                          * zapped or set based on if a RTO measurment is
6919                          * needed.
6920                          */
6921                         data_list[i]->do_rtt = 0;
6922                 }
6923                 /* record time */
6924                 data_list[i]->sent_rcv_time = net->last_sent_time;
6925                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6926                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6927                 if (data_list[i]->whoTo == NULL) {
6928                         data_list[i]->whoTo = net;
6929                         atomic_add_int(&net->ref_count, 1);
6930                 }
6931                 /* on to the sent queue */
6932                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6933                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6934                         struct sctp_tmit_chunk *tpp;
6935
6936                         /* need to move back */
6937         back_up_more:
6938                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6939                         if (tpp == NULL) {
6940                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6941                                 goto all_done;
6942                         }
6943                         tp1 = tpp;
6944                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6945                                 goto back_up_more;
6946                         }
6947                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6948                 } else {
6949                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6950                             data_list[i],
6951                             sctp_next);
6952                 }
6953 all_done:
6954                 /* This does not lower until the cum-ack passes it */
6955                 asoc->sent_queue_cnt++;
6956                 if ((asoc->peers_rwnd <= 0) &&
6957                     (asoc->total_flight == 0) &&
6958                     (bundle_at == 1)) {
6959                         /* Mark the chunk as being a window probe */
6960                         SCTP_STAT_INCR(sctps_windowprobed);
6961                 }
6962 #ifdef SCTP_AUDITING_ENABLED
6963                 sctp_audit_log(0xC2, 3);
6964 #endif
6965                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6966                 data_list[i]->snd_count = 1;
6967                 data_list[i]->rec.data.chunk_was_revoked = 0;
6968                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6969                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6970                             data_list[i]->whoTo->flight_size,
6971                             data_list[i]->book_size,
6972                             (uintptr_t) data_list[i]->whoTo,
6973                             data_list[i]->rec.data.TSN_seq);
6974                 }
6975                 sctp_flight_size_increase(data_list[i]);
6976                 sctp_total_flight_increase(stcb, data_list[i]);
6977                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6978                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6979                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6980                 }
6981                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6982                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6983                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6984                         /* SWS sender side engages */
6985                         asoc->peers_rwnd = 0;
6986                 }
6987         }
6988         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6989                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6990         }
6991 }
6992
6993 static void
6994 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6995 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6996     SCTP_UNUSED
6997 #endif
6998 )
6999 {
7000         struct sctp_tmit_chunk *chk, *nchk;
7001
7002         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7003                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7004                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7005                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7006                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7007                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7008                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7009                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7010                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7011                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7012                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7013                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7014                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7015                         /* Stray chunks must be cleaned up */
7016         clean_up_anyway:
7017                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7018                         if (chk->data) {
7019                                 sctp_m_freem(chk->data);
7020                                 chk->data = NULL;
7021                         }
7022                         asoc->ctrl_queue_cnt--;
7023                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7024                                 asoc->fwd_tsn_cnt--;
7025                         sctp_free_a_chunk(stcb, chk, so_locked);
7026                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7027                         /* special handling, we must look into the param */
7028                         if (chk != asoc->str_reset) {
7029                                 goto clean_up_anyway;
7030                         }
7031                 }
7032         }
7033 }
7034
7035
7036 static int
7037 sctp_can_we_split_this(struct sctp_tcb *stcb,
7038     uint32_t length,
7039     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7040 {
7041         /*
7042          * Make a decision on if I should split a msg into multiple parts.
7043          * This is only asked of incomplete messages.
7044          */
7045         if (eeor_on) {
7046                 /*
7047                  * If we are doing EEOR we need to always send it if its the
7048                  * entire thing, since it might be all the guy is putting in
7049                  * the hopper.
7050                  */
7051                 if (goal_mtu >= length) {
7052                         /*-
7053                          * If we have data outstanding,
7054                          * we get another chance when the sack
7055                          * arrives to transmit - wait for more data
7056                          */
7057                         if (stcb->asoc.total_flight == 0) {
7058                                 /*
7059                                  * If nothing is in flight, we zero the
7060                                  * packet counter.
7061                                  */
7062                                 return (length);
7063                         }
7064                         return (0);
7065
7066                 } else {
7067                         /* You can fill the rest */
7068                         return (goal_mtu);
7069                 }
7070         }
7071         /*-
7072          * For those strange folk that make the send buffer
7073          * smaller than our fragmentation point, we can't
7074          * get a full msg in so we have to allow splitting.
7075          */
7076         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7077                 return (length);
7078         }
7079         if ((length <= goal_mtu) ||
7080             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7081                 /* Sub-optimial residual don't split in non-eeor mode. */
7082                 return (0);
7083         }
7084         /*
7085          * If we reach here length is larger than the goal_mtu. Do we wish
7086          * to split it for the sake of packet putting together?
7087          */
7088         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7089                 /* Its ok to split it */
7090                 return (min(goal_mtu, frag_point));
7091         }
7092         /* Nope, can't split */
7093         return (0);
7094
7095 }
7096
7097 static uint32_t
7098 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7099     struct sctp_stream_out *strq,
7100     uint32_t goal_mtu,
7101     uint32_t frag_point,
7102     int *locked,
7103     int *giveup,
7104     int eeor_mode,
7105     int *bail,
7106     int so_locked
7107 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7108     SCTP_UNUSED
7109 #endif
7110 )
7111 {
7112         /* Move from the stream to the send_queue keeping track of the total */
7113         struct sctp_association *asoc;
7114         struct sctp_stream_queue_pending *sp;
7115         struct sctp_tmit_chunk *chk;
7116         struct sctp_data_chunk *dchkh;
7117         uint32_t to_move, length;
7118         uint8_t rcv_flags = 0;
7119         uint8_t some_taken;
7120         uint8_t send_lock_up = 0;
7121
7122         SCTP_TCB_LOCK_ASSERT(stcb);
7123         asoc = &stcb->asoc;
7124 one_more_time:
7125         /* sa_ignore FREED_MEMORY */
7126         sp = TAILQ_FIRST(&strq->outqueue);
7127         if (sp == NULL) {
7128                 *locked = 0;
7129                 if (send_lock_up == 0) {
7130                         SCTP_TCB_SEND_LOCK(stcb);
7131                         send_lock_up = 1;
7132                 }
7133                 sp = TAILQ_FIRST(&strq->outqueue);
7134                 if (sp) {
7135                         goto one_more_time;
7136                 }
7137                 if (strq->last_msg_incomplete) {
7138                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7139                             strq->stream_no,
7140                             strq->last_msg_incomplete);
7141                         strq->last_msg_incomplete = 0;
7142                 }
7143                 to_move = 0;
7144                 if (send_lock_up) {
7145                         SCTP_TCB_SEND_UNLOCK(stcb);
7146                         send_lock_up = 0;
7147                 }
7148                 goto out_of;
7149         }
7150         if ((sp->msg_is_complete) && (sp->length == 0)) {
7151                 if (sp->sender_all_done) {
7152                         /*
7153                          * We are doing differed cleanup. Last time through
7154                          * when we took all the data the sender_all_done was
7155                          * not set.
7156                          */
7157                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7158                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7159                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7160                                     sp->sender_all_done,
7161                                     sp->length,
7162                                     sp->msg_is_complete,
7163                                     sp->put_last_out,
7164                                     send_lock_up);
7165                         }
7166                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7167                                 SCTP_TCB_SEND_LOCK(stcb);
7168                                 send_lock_up = 1;
7169                         }
7170                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7171                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7172                         if (strq->state == SCTP_STREAM_RESET_PENDING &&
7173                             TAILQ_EMPTY(&strq->outqueue)) {
7174                                 stcb->asoc.trigger_reset = 1;
7175                         }
7176                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7177                         if (sp->net) {
7178                                 sctp_free_remote_addr(sp->net);
7179                                 sp->net = NULL;
7180                         }
7181                         if (sp->data) {
7182                                 sctp_m_freem(sp->data);
7183                                 sp->data = NULL;
7184                         }
7185                         sctp_free_a_strmoq(stcb, sp, so_locked);
7186                         /* we can't be locked to it */
7187                         *locked = 0;
7188                         stcb->asoc.locked_on_sending = NULL;
7189                         if (send_lock_up) {
7190                                 SCTP_TCB_SEND_UNLOCK(stcb);
7191                                 send_lock_up = 0;
7192                         }
7193                         /* back to get the next msg */
7194                         goto one_more_time;
7195                 } else {
7196                         /*
7197                          * sender just finished this but still holds a
7198                          * reference
7199                          */
7200                         *locked = 1;
7201                         *giveup = 1;
7202                         to_move = 0;
7203                         goto out_of;
7204                 }
7205         } else {
7206                 /* is there some to get */
7207                 if (sp->length == 0) {
7208                         /* no */
7209                         *locked = 1;
7210                         *giveup = 1;
7211                         to_move = 0;
7212                         goto out_of;
7213                 } else if (sp->discard_rest) {
7214                         if (send_lock_up == 0) {
7215                                 SCTP_TCB_SEND_LOCK(stcb);
7216                                 send_lock_up = 1;
7217                         }
7218                         /* Whack down the size */
7219                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7220                         if ((stcb->sctp_socket != NULL) && \
7221                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7222                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7223                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7224                         }
7225                         if (sp->data) {
7226                                 sctp_m_freem(sp->data);
7227                                 sp->data = NULL;
7228                                 sp->tail_mbuf = NULL;
7229                         }
7230                         sp->length = 0;
7231                         sp->some_taken = 1;
7232                         *locked = 1;
7233                         *giveup = 1;
7234                         to_move = 0;
7235                         goto out_of;
7236                 }
7237         }
7238         some_taken = sp->some_taken;
7239         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7240                 sp->msg_is_complete = 1;
7241         }
7242 re_look:
7243         length = sp->length;
7244         if (sp->msg_is_complete) {
7245                 /* The message is complete */
7246                 to_move = min(length, frag_point);
7247                 if (to_move == length) {
7248                         /* All of it fits in the MTU */
7249                         if (sp->some_taken) {
7250                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7251                                 sp->put_last_out = 1;
7252                         } else {
7253                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7254                                 sp->put_last_out = 1;
7255                         }
7256                 } else {
7257                         /* Not all of it fits, we fragment */
7258                         if (sp->some_taken == 0) {
7259                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7260                         }
7261                         sp->some_taken = 1;
7262                 }
7263         } else {
7264                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7265                 if (to_move) {
7266                         /*-
7267                          * We use a snapshot of length in case it
7268                          * is expanding during the compare.
7269                          */
7270                         uint32_t llen;
7271
7272                         llen = length;
7273                         if (to_move >= llen) {
7274                                 to_move = llen;
7275                                 if (send_lock_up == 0) {
7276                                         /*-
7277                                          * We are taking all of an incomplete msg
7278                                          * thus we need a send lock.
7279                                          */
7280                                         SCTP_TCB_SEND_LOCK(stcb);
7281                                         send_lock_up = 1;
7282                                         if (sp->msg_is_complete) {
7283                                                 /*
7284                                                  * the sender finished the
7285                                                  * msg
7286                                                  */
7287                                                 goto re_look;
7288                                         }
7289                                 }
7290                         }
7291                         if (sp->some_taken == 0) {
7292                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7293                                 sp->some_taken = 1;
7294                         }
7295                 } else {
7296                         /* Nothing to take. */
7297                         if (sp->some_taken) {
7298                                 *locked = 1;
7299                         }
7300                         *giveup = 1;
7301                         to_move = 0;
7302                         goto out_of;
7303                 }
7304         }
7305
7306         /* If we reach here, we can copy out a chunk */
7307         sctp_alloc_a_chunk(stcb, chk);
7308         if (chk == NULL) {
7309                 /* No chunk memory */
7310                 *giveup = 1;
7311                 to_move = 0;
7312                 goto out_of;
7313         }
7314         /*
7315          * Setup for unordered if needed by looking at the user sent info
7316          * flags.
7317          */
7318         if (sp->sinfo_flags & SCTP_UNORDERED) {
7319                 rcv_flags |= SCTP_DATA_UNORDERED;
7320         }
7321         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7322             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7323                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7324         }
7325         /* clear out the chunk before setting up */
7326         memset(chk, 0, sizeof(*chk));
7327         chk->rec.data.rcv_flags = rcv_flags;
7328
7329         if (to_move >= length) {
7330                 /* we think we can steal the whole thing */
7331                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7332                         SCTP_TCB_SEND_LOCK(stcb);
7333                         send_lock_up = 1;
7334                 }
7335                 if (to_move < sp->length) {
7336                         /* bail, it changed */
7337                         goto dont_do_it;
7338                 }
7339                 chk->data = sp->data;
7340                 chk->last_mbuf = sp->tail_mbuf;
7341                 /* register the stealing */
7342                 sp->data = sp->tail_mbuf = NULL;
7343         } else {
7344                 struct mbuf *m;
7345
7346 dont_do_it:
7347                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7348                 chk->last_mbuf = NULL;
7349                 if (chk->data == NULL) {
7350                         sp->some_taken = some_taken;
7351                         sctp_free_a_chunk(stcb, chk, so_locked);
7352                         *bail = 1;
7353                         to_move = 0;
7354                         goto out_of;
7355                 }
7356 #ifdef SCTP_MBUF_LOGGING
7357                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7358                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7359                 }
7360 #endif
7361                 /* Pull off the data */
7362                 m_adj(sp->data, to_move);
7363                 /* Now lets work our way down and compact it */
7364                 m = sp->data;
7365                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7366                         sp->data = SCTP_BUF_NEXT(m);
7367                         SCTP_BUF_NEXT(m) = NULL;
7368                         if (sp->tail_mbuf == m) {
7369                                 /*-
7370                                  * Freeing tail? TSNH since
7371                                  * we supposedly were taking less
7372                                  * than the sp->length.
7373                                  */
7374 #ifdef INVARIANTS
7375                                 panic("Huh, freing tail? - TSNH");
7376 #else
7377                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7378                                 sp->tail_mbuf = sp->data = NULL;
7379                                 sp->length = 0;
7380 #endif
7381
7382                         }
7383                         sctp_m_free(m);
7384                         m = sp->data;
7385                 }
7386         }
7387         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7388                 chk->copy_by_ref = 1;
7389         } else {
7390                 chk->copy_by_ref = 0;
7391         }
7392         /*
7393          * get last_mbuf and counts of mb useage This is ugly but hopefully
7394          * its only one mbuf.
7395          */
7396         if (chk->last_mbuf == NULL) {
7397                 chk->last_mbuf = chk->data;
7398                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7399                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7400                 }
7401         }
7402         if (to_move > length) {
7403                 /*- This should not happen either
7404                  * since we always lower to_move to the size
7405                  * of sp->length if its larger.
7406                  */
7407 #ifdef INVARIANTS
7408                 panic("Huh, how can to_move be larger?");
7409 #else
7410                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7411                 sp->length = 0;
7412 #endif
7413         } else {
7414                 atomic_subtract_int(&sp->length, to_move);
7415         }
7416         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7417                 /* Not enough room for a chunk header, get some */
7418                 struct mbuf *m;
7419
7420                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7421                 if (m == NULL) {
7422                         /*
7423                          * we're in trouble here. _PREPEND below will free
7424                          * all the data if there is no leading space, so we
7425                          * must put the data back and restore.
7426                          */
7427                         if (send_lock_up == 0) {
7428                                 SCTP_TCB_SEND_LOCK(stcb);
7429                                 send_lock_up = 1;
7430                         }
7431                         if (sp->data == NULL) {
7432                                 /* unsteal the data */
7433                                 sp->data = chk->data;
7434                                 sp->tail_mbuf = chk->last_mbuf;
7435                         } else {
7436                                 struct mbuf *m_tmp;
7437
7438                                 /* reassemble the data */
7439                                 m_tmp = sp->data;
7440                                 sp->data = chk->data;
7441                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7442                         }
7443                         sp->some_taken = some_taken;
7444                         atomic_add_int(&sp->length, to_move);
7445                         chk->data = NULL;
7446                         *bail = 1;
7447                         sctp_free_a_chunk(stcb, chk, so_locked);
7448                         to_move = 0;
7449                         goto out_of;
7450                 } else {
7451                         SCTP_BUF_LEN(m) = 0;
7452                         SCTP_BUF_NEXT(m) = chk->data;
7453                         chk->data = m;
7454                         M_ALIGN(chk->data, 4);
7455                 }
7456         }
7457         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7458         if (chk->data == NULL) {
7459                 /* HELP, TSNH since we assured it would not above? */
7460 #ifdef INVARIANTS
7461                 panic("prepend failes HELP?");
7462 #else
7463                 SCTP_PRINTF("prepend fails HELP?\n");
7464                 sctp_free_a_chunk(stcb, chk, so_locked);
7465 #endif
7466                 *bail = 1;
7467                 to_move = 0;
7468                 goto out_of;
7469         }
7470         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7471         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7472         chk->book_size_scale = 0;
7473         chk->sent = SCTP_DATAGRAM_UNSENT;
7474
7475         chk->flags = 0;
7476         chk->asoc = &stcb->asoc;
7477         chk->pad_inplace = 0;
7478         chk->no_fr_allowed = 0;
7479         chk->rec.data.stream_seq = strq->next_sequence_send;
7480         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7481             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7482                 strq->next_sequence_send++;
7483         }
7484         chk->rec.data.stream_number = sp->stream;
7485         chk->rec.data.payloadtype = sp->ppid;
7486         chk->rec.data.context = sp->context;
7487         chk->rec.data.doing_fast_retransmit = 0;
7488
7489         chk->rec.data.timetodrop = sp->ts;
7490         chk->flags = sp->act_flags;
7491
7492         if (sp->net) {
7493                 chk->whoTo = sp->net;
7494                 atomic_add_int(&chk->whoTo->ref_count, 1);
7495         } else
7496                 chk->whoTo = NULL;
7497
7498         if (sp->holds_key_ref) {
7499                 chk->auth_keyid = sp->auth_keyid;
7500                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7501                 chk->holds_key_ref = 1;
7502         }
7503         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7504         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7505                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7506                     (uintptr_t) stcb, sp->length,
7507                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7508                     chk->rec.data.TSN_seq);
7509         }
7510         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7511         /*
7512          * Put the rest of the things in place now. Size was done earlier in
7513          * previous loop prior to padding.
7514          */
7515
7516 #ifdef SCTP_ASOCLOG_OF_TSNS
7517         SCTP_TCB_LOCK_ASSERT(stcb);
7518         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7519                 asoc->tsn_out_at = 0;
7520                 asoc->tsn_out_wrapped = 1;
7521         }
7522         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7523         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7524         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7525         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7526         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7527         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7528         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7529         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7530         asoc->tsn_out_at++;
7531 #endif
7532
7533         dchkh->ch.chunk_type = SCTP_DATA;
7534         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7535         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7536         dchkh->dp.stream_id = htons(strq->stream_no);
7537         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7538         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7539         dchkh->ch.chunk_length = htons(chk->send_size);
7540         /* Now advance the chk->send_size by the actual pad needed. */
7541         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7542                 /* need a pad */
7543                 struct mbuf *lm;
7544                 int pads;
7545
7546                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7547                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7548                 if (lm != NULL) {
7549                         chk->last_mbuf = lm;
7550                         chk->pad_inplace = 1;
7551                 }
7552                 chk->send_size += pads;
7553         }
7554         if (PR_SCTP_ENABLED(chk->flags)) {
7555                 asoc->pr_sctp_cnt++;
7556         }
7557         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7558                 /* All done pull and kill the message */
7559                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7560                 if (sp->put_last_out == 0) {
7561                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7562                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7563                             sp->sender_all_done,
7564                             sp->length,
7565                             sp->msg_is_complete,
7566                             sp->put_last_out,
7567                             send_lock_up);
7568                 }
7569                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7570                         SCTP_TCB_SEND_LOCK(stcb);
7571                         send_lock_up = 1;
7572                 }
7573                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7574                 if (strq->state == SCTP_STREAM_RESET_PENDING &&
7575                     TAILQ_EMPTY(&strq->outqueue)) {
7576                         stcb->asoc.trigger_reset = 1;
7577                 }
7578                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7579                 if (sp->net) {
7580                         sctp_free_remote_addr(sp->net);
7581                         sp->net = NULL;
7582                 }
7583                 if (sp->data) {
7584                         sctp_m_freem(sp->data);
7585                         sp->data = NULL;
7586                 }
7587                 sctp_free_a_strmoq(stcb, sp, so_locked);
7588
7589                 /* we can't be locked to it */
7590                 *locked = 0;
7591                 stcb->asoc.locked_on_sending = NULL;
7592         } else {
7593                 /* more to go, we are locked */
7594                 *locked = 1;
7595         }
7596         asoc->chunks_on_out_queue++;
7597         strq->chunks_on_queues++;
7598         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7599         asoc->send_queue_cnt++;
7600 out_of:
7601         if (send_lock_up) {
7602                 SCTP_TCB_SEND_UNLOCK(stcb);
7603         }
7604         return (to_move);
7605 }
7606
7607
7608 static void
7609 sctp_fill_outqueue(struct sctp_tcb *stcb,
7610     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7611 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7612     SCTP_UNUSED
7613 #endif
7614 )
7615 {
7616         struct sctp_association *asoc;
7617         struct sctp_stream_out *strq;
7618         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7619         int locked, giveup;
7620
7621         SCTP_TCB_LOCK_ASSERT(stcb);
7622         asoc = &stcb->asoc;
7623         switch (net->ro._l_addr.sa.sa_family) {
7624 #ifdef INET
7625         case AF_INET:
7626                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7627                 break;
7628 #endif
7629 #ifdef INET6
7630         case AF_INET6:
7631                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7632                 break;
7633 #endif
7634         default:
7635                 /* TSNH */
7636                 goal_mtu = net->mtu;
7637                 break;
7638         }
7639         /* Need an allowance for the data chunk header too */
7640         goal_mtu -= sizeof(struct sctp_data_chunk);
7641
7642         /* must make even word boundary */
7643         goal_mtu &= 0xfffffffc;
7644         if (asoc->locked_on_sending) {
7645                 /* We are stuck on one stream until the message completes. */
7646                 strq = asoc->locked_on_sending;
7647                 locked = 1;
7648         } else {
7649                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7650                 locked = 0;
7651         }
7652         while ((goal_mtu > 0) && strq) {
7653                 giveup = 0;
7654                 bail = 0;
7655                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7656                     &giveup, eeor_mode, &bail, so_locked);
7657                 if (moved_how_much)
7658                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7659
7660                 if (locked) {
7661                         asoc->locked_on_sending = strq;
7662                         if ((moved_how_much == 0) || (giveup) || bail)
7663                                 /* no more to move for now */
7664                                 break;
7665                 } else {
7666                         asoc->locked_on_sending = NULL;
7667                         if ((giveup) || bail) {
7668                                 break;
7669                         }
7670                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7671                         if (strq == NULL) {
7672                                 break;
7673                         }
7674                 }
7675                 total_moved += moved_how_much;
7676                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7677                 goal_mtu &= 0xfffffffc;
7678         }
7679         if (bail)
7680                 *quit_now = 1;
7681
7682         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7683
7684         if (total_moved == 0) {
7685                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7686                     (net == stcb->asoc.primary_destination)) {
7687                         /* ran dry for primary network net */
7688                         SCTP_STAT_INCR(sctps_primary_randry);
7689                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7690                         /* ran dry with CMT on */
7691                         SCTP_STAT_INCR(sctps_cmt_randry);
7692                 }
7693         }
7694 }
7695
7696 void
7697 sctp_fix_ecn_echo(struct sctp_association *asoc)
7698 {
7699         struct sctp_tmit_chunk *chk;
7700
7701         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7702                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7703                         chk->sent = SCTP_DATAGRAM_UNSENT;
7704                 }
7705         }
7706 }
7707
7708 void
7709 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7710 {
7711         struct sctp_association *asoc;
7712         struct sctp_tmit_chunk *chk;
7713         struct sctp_stream_queue_pending *sp;
7714         unsigned int i;
7715
7716         if (net == NULL) {
7717                 return;
7718         }
7719         asoc = &stcb->asoc;
7720         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7721                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7722                         if (sp->net == net) {
7723                                 sctp_free_remote_addr(sp->net);
7724                                 sp->net = NULL;
7725                         }
7726                 }
7727         }
7728         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7729                 if (chk->whoTo == net) {
7730                         sctp_free_remote_addr(chk->whoTo);
7731                         chk->whoTo = NULL;
7732                 }
7733         }
7734 }
7735
7736 int
7737 sctp_med_chunk_output(struct sctp_inpcb *inp,
7738     struct sctp_tcb *stcb,
7739     struct sctp_association *asoc,
7740     int *num_out,
7741     int *reason_code,
7742     int control_only, int from_where,
7743     struct timeval *now, int *now_filled, int frag_point, int so_locked
7744 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7745     SCTP_UNUSED
7746 #endif
7747 )
7748 {
7749         /**
7750          * Ok this is the generic chunk service queue. we must do the
7751          * following: - Service the stream queue that is next, moving any
7752          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7753          * LAST to the out queue in one pass) and assigning TSN's - Check to
7754          * see if the cwnd/rwnd allows any output, if so we go ahead and
7755          * fomulate and send the low level chunks. Making sure to combine
7756          * any control in the control chunk queue also.
7757          */
7758         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7759         struct mbuf *outchain, *endoutchain;
7760         struct sctp_tmit_chunk *chk, *nchk;
7761
7762         /* temp arrays for unlinking */
7763         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7764         int no_fragmentflg, error;
7765         unsigned int max_rwnd_per_dest, max_send_per_dest;
7766         int one_chunk, hbflag, skip_data_for_this_net;
7767         int asconf, cookie, no_out_cnt;
7768         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7769         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7770         int tsns_sent = 0;
7771         uint32_t auth_offset = 0;
7772         struct sctp_auth_chunk *auth = NULL;
7773         uint16_t auth_keyid;
7774         int override_ok = 1;
7775         int skip_fill_up = 0;
7776         int data_auth_reqd = 0;
7777
7778         /*
7779          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7780          * destination.
7781          */
7782         int quit_now = 0;
7783
7784         *num_out = 0;
7785         *reason_code = 0;
7786         auth_keyid = stcb->asoc.authinfo.active_keyid;
7787         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7788             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7789             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7790                 eeor_mode = 1;
7791         } else {
7792                 eeor_mode = 0;
7793         }
7794         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7795         /*
7796          * First lets prime the pump. For each destination, if there is room
7797          * in the flight size, attempt to pull an MTU's worth out of the
7798          * stream queues into the general send_queue
7799          */
7800 #ifdef SCTP_AUDITING_ENABLED
7801         sctp_audit_log(0xC2, 2);
7802 #endif
7803         SCTP_TCB_LOCK_ASSERT(stcb);
7804         hbflag = 0;
7805         if (control_only)
7806                 no_data_chunks = 1;
7807         else
7808                 no_data_chunks = 0;
7809
7810         /* Nothing to possible to send? */
7811         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7812             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7813             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7814             TAILQ_EMPTY(&asoc->send_queue) &&
7815             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7816 nothing_to_send:
7817                 *reason_code = 9;
7818                 return (0);
7819         }
7820         if (asoc->peers_rwnd == 0) {
7821                 /* No room in peers rwnd */
7822                 *reason_code = 1;
7823                 if (asoc->total_flight > 0) {
7824                         /* we are allowed one chunk in flight */
7825                         no_data_chunks = 1;
7826                 }
7827         }
7828         if (stcb->asoc.ecn_echo_cnt_onq) {
7829                 /* Record where a sack goes, if any */
7830                 if (no_data_chunks &&
7831                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7832                         /* Nothing but ECNe to send - we don't do that */
7833                         goto nothing_to_send;
7834                 }
7835                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7836                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7837                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7838                                 sack_goes_to = chk->whoTo;
7839                                 break;
7840                         }
7841                 }
7842         }
7843         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7844         if (stcb->sctp_socket)
7845                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7846         else
7847                 max_send_per_dest = 0;
7848         if (no_data_chunks == 0) {
7849                 /* How many non-directed chunks are there? */
7850                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7851                         if (chk->whoTo == NULL) {
7852                                 /*
7853                                  * We already have non-directed chunks on
7854                                  * the queue, no need to do a fill-up.
7855                                  */
7856                                 skip_fill_up = 1;
7857                                 break;
7858                         }
7859                 }
7860
7861         }
7862         if ((no_data_chunks == 0) &&
7863             (skip_fill_up == 0) &&
7864             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7865                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7866                         /*
7867                          * This for loop we are in takes in each net, if
7868                          * its's got space in cwnd and has data sent to it
7869                          * (when CMT is off) then it calls
7870                          * sctp_fill_outqueue for the net. This gets data on
7871                          * the send queue for that network.
7872                          *
7873                          * In sctp_fill_outqueue TSN's are assigned and data is
7874                          * copied out of the stream buffers. Note mostly
7875                          * copy by reference (we hope).
7876                          */
7877                         net->window_probe = 0;
7878                         if ((net != stcb->asoc.alternate) &&
7879                             ((net->dest_state & SCTP_ADDR_PF) ||
7880                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7881                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7882                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7883                                         sctp_log_cwnd(stcb, net, 1,
7884                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7885                                 }
7886                                 continue;
7887                         }
7888                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7889                             (net->flight_size == 0)) {
7890                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7891                         }
7892                         if (net->flight_size >= net->cwnd) {
7893                                 /* skip this network, no room - can't fill */
7894                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7895                                         sctp_log_cwnd(stcb, net, 3,
7896                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7897                                 }
7898                                 continue;
7899                         }
7900                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7901                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7902                         }
7903                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7904                         if (quit_now) {
7905                                 /* memory alloc failure */
7906                                 no_data_chunks = 1;
7907                                 break;
7908                         }
7909                 }
7910         }
7911         /* now service each destination and send out what we can for it */
7912         /* Nothing to send? */
7913         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7914             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7915             TAILQ_EMPTY(&asoc->send_queue)) {
7916                 *reason_code = 8;
7917                 return (0);
7918         }
7919         if (asoc->sctp_cmt_on_off > 0) {
7920                 /* get the last start point */
7921                 start_at = asoc->last_net_cmt_send_started;
7922                 if (start_at == NULL) {
7923                         /* null so to beginning */
7924                         start_at = TAILQ_FIRST(&asoc->nets);
7925                 } else {
7926                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7927                         if (start_at == NULL) {
7928                                 start_at = TAILQ_FIRST(&asoc->nets);
7929                         }
7930                 }
7931                 asoc->last_net_cmt_send_started = start_at;
7932         } else {
7933                 start_at = TAILQ_FIRST(&asoc->nets);
7934         }
7935         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7936                 if (chk->whoTo == NULL) {
7937                         if (asoc->alternate) {
7938                                 chk->whoTo = asoc->alternate;
7939                         } else {
7940                                 chk->whoTo = asoc->primary_destination;
7941                         }
7942                         atomic_add_int(&chk->whoTo->ref_count, 1);
7943                 }
7944         }
7945         old_start_at = NULL;
7946 again_one_more_time:
7947         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7948                 /* how much can we send? */
7949                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7950                 if (old_start_at && (old_start_at == net)) {
7951                         /* through list ocmpletely. */
7952                         break;
7953                 }
7954                 tsns_sent = 0xa;
7955                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7956                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7957                     (net->flight_size >= net->cwnd)) {
7958                         /*
7959                          * Nothing on control or asconf and flight is full,
7960                          * we can skip even in the CMT case.
7961                          */
7962                         continue;
7963                 }
7964                 bundle_at = 0;
7965                 endoutchain = outchain = NULL;
7966                 no_fragmentflg = 1;
7967                 one_chunk = 0;
7968                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7969                         skip_data_for_this_net = 1;
7970                 } else {
7971                         skip_data_for_this_net = 0;
7972                 }
7973                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7974 #ifdef INET
7975                 case AF_INET:
7976                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7977                         break;
7978 #endif
7979 #ifdef INET6
7980                 case AF_INET6:
7981                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
7982                         break;
7983 #endif
7984                 default:
7985                         /* TSNH */
7986                         mtu = net->mtu;
7987                         break;
7988                 }
7989                 mx_mtu = mtu;
7990                 to_out = 0;
7991                 if (mtu > asoc->peers_rwnd) {
7992                         if (asoc->total_flight > 0) {
7993                                 /* We have a packet in flight somewhere */
7994                                 r_mtu = asoc->peers_rwnd;
7995                         } else {
7996                                 /* We are always allowed to send one MTU out */
7997                                 one_chunk = 1;
7998                                 r_mtu = mtu;
7999                         }
8000                 } else {
8001                         r_mtu = mtu;
8002                 }
8003                 error = 0;
8004                 /************************/
8005                 /* ASCONF transmission */
8006                 /************************/
8007                 /* Now first lets go through the asconf queue */
8008                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8009                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8010                                 continue;
8011                         }
8012                         if (chk->whoTo == NULL) {
8013                                 if (asoc->alternate == NULL) {
8014                                         if (asoc->primary_destination != net) {
8015                                                 break;
8016                                         }
8017                                 } else {
8018                                         if (asoc->alternate != net) {
8019                                                 break;
8020                                         }
8021                                 }
8022                         } else {
8023                                 if (chk->whoTo != net) {
8024                                         break;
8025                                 }
8026                         }
8027                         if (chk->data == NULL) {
8028                                 break;
8029                         }
8030                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8031                             chk->sent != SCTP_DATAGRAM_RESEND) {
8032                                 break;
8033                         }
8034                         /*
8035                          * if no AUTH is yet included and this chunk
8036                          * requires it, make sure to account for it.  We
8037                          * don't apply the size until the AUTH chunk is
8038                          * actually added below in case there is no room for
8039                          * this chunk. NOTE: we overload the use of "omtu"
8040                          * here
8041                          */
8042                         if ((auth == NULL) &&
8043                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8044                             stcb->asoc.peer_auth_chunks)) {
8045                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8046                         } else
8047                                 omtu = 0;
8048                         /* Here we do NOT factor the r_mtu */
8049                         if ((chk->send_size < (int)(mtu - omtu)) ||
8050                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8051                                 /*
8052                                  * We probably should glom the mbuf chain
8053                                  * from the chk->data for control but the
8054                                  * problem is it becomes yet one more level
8055                                  * of tracking to do if for some reason
8056                                  * output fails. Then I have got to
8057                                  * reconstruct the merged control chain.. el
8058                                  * yucko.. for now we take the easy way and
8059                                  * do the copy
8060                                  */
8061                                 /*
8062                                  * Add an AUTH chunk, if chunk requires it
8063                                  * save the offset into the chain for AUTH
8064                                  */
8065                                 if ((auth == NULL) &&
8066                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8067                                     stcb->asoc.peer_auth_chunks))) {
8068                                         outchain = sctp_add_auth_chunk(outchain,
8069                                             &endoutchain,
8070                                             &auth,
8071                                             &auth_offset,
8072                                             stcb,
8073                                             chk->rec.chunk_id.id);
8074                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8075                                 }
8076                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8077                                     (int)chk->rec.chunk_id.can_take_data,
8078                                     chk->send_size, chk->copy_by_ref);
8079                                 if (outchain == NULL) {
8080                                         *reason_code = 8;
8081                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8082                                         return (ENOMEM);
8083                                 }
8084                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8085                                 /* update our MTU size */
8086                                 if (mtu > (chk->send_size + omtu))
8087                                         mtu -= (chk->send_size + omtu);
8088                                 else
8089                                         mtu = 0;
8090                                 to_out += (chk->send_size + omtu);
8091                                 /* Do clear IP_DF ? */
8092                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8093                                         no_fragmentflg = 0;
8094                                 }
8095                                 if (chk->rec.chunk_id.can_take_data)
8096                                         chk->data = NULL;
8097                                 /*
8098                                  * set hb flag since we can use these for
8099                                  * RTO
8100                                  */
8101                                 hbflag = 1;
8102                                 asconf = 1;
8103                                 /*
8104                                  * should sysctl this: don't bundle data
8105                                  * with ASCONF since it requires AUTH
8106                                  */
8107                                 no_data_chunks = 1;
8108                                 chk->sent = SCTP_DATAGRAM_SENT;
8109                                 if (chk->whoTo == NULL) {
8110                                         chk->whoTo = net;
8111                                         atomic_add_int(&net->ref_count, 1);
8112                                 }
8113                                 chk->snd_count++;
8114                                 if (mtu == 0) {
8115                                         /*
8116                                          * Ok we are out of room but we can
8117                                          * output without effecting the
8118                                          * flight size since this little guy
8119                                          * is a control only packet.
8120                                          */
8121                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8122                                         /*
8123                                          * do NOT clear the asconf flag as
8124                                          * it is used to do appropriate
8125                                          * source address selection.
8126                                          */
8127                                         if (*now_filled == 0) {
8128                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8129                                                 *now_filled = 1;
8130                                         }
8131                                         net->last_sent_time = *now;
8132                                         hbflag = 0;
8133                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8134                                             (struct sockaddr *)&net->ro._l_addr,
8135                                             outchain, auth_offset, auth,
8136                                             stcb->asoc.authinfo.active_keyid,
8137                                             no_fragmentflg, 0, asconf,
8138                                             inp->sctp_lport, stcb->rport,
8139                                             htonl(stcb->asoc.peer_vtag),
8140                                             net->port, NULL,
8141                                             0, 0,
8142                                             so_locked))) {
8143                                                 /*
8144                                                  * error, we could not
8145                                                  * output
8146                                                  */
8147                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8148                                                 if (from_where == 0) {
8149                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8150                                                 }
8151                                                 if (error == ENOBUFS) {
8152                                                         asoc->ifp_had_enobuf = 1;
8153                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8154                                                 }
8155                                                 /* error, could not output */
8156                                                 if (error == EHOSTUNREACH) {
8157                                                         /*
8158                                                          * Destination went
8159                                                          * unreachable
8160                                                          * during this send
8161                                                          */
8162                                                         sctp_move_chunks_from_net(stcb, net);
8163                                                 }
8164                                                 *reason_code = 7;
8165                                                 break;
8166                                         } else {
8167                                                 asoc->ifp_had_enobuf = 0;
8168                                         }
8169                                         /*
8170                                          * increase the number we sent, if a
8171                                          * cookie is sent we don't tell them
8172                                          * any was sent out.
8173                                          */
8174                                         outchain = endoutchain = NULL;
8175                                         auth = NULL;
8176                                         auth_offset = 0;
8177                                         if (!no_out_cnt)
8178                                                 *num_out += ctl_cnt;
8179                                         /* recalc a clean slate and setup */
8180                                         switch (net->ro._l_addr.sa.sa_family) {
8181 #ifdef INET
8182                                         case AF_INET:
8183                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8184                                                 break;
8185 #endif
8186 #ifdef INET6
8187                                         case AF_INET6:
8188                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8189                                                 break;
8190 #endif
8191                                         default:
8192                                                 /* TSNH */
8193                                                 mtu = net->mtu;
8194                                                 break;
8195                                         }
8196                                         to_out = 0;
8197                                         no_fragmentflg = 1;
8198                                 }
8199                         }
8200                 }
8201                 if (error != 0) {
8202                         /* try next net */
8203                         continue;
8204                 }
8205                 /************************/
8206                 /* Control transmission */
8207                 /************************/
8208                 /* Now first lets go through the control queue */
8209                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8210                         if ((sack_goes_to) &&
8211                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8212                             (chk->whoTo != sack_goes_to)) {
8213                                 /*
8214                                  * if we have a sack in queue, and we are
8215                                  * looking at an ecn echo that is NOT queued
8216                                  * to where the sack is going..
8217                                  */
8218                                 if (chk->whoTo == net) {
8219                                         /*
8220                                          * Don't transmit it to where its
8221                                          * going (current net)
8222                                          */
8223                                         continue;
8224                                 } else if (sack_goes_to == net) {
8225                                         /*
8226                                          * But do transmit it to this
8227                                          * address
8228                                          */
8229                                         goto skip_net_check;
8230                                 }
8231                         }
8232                         if (chk->whoTo == NULL) {
8233                                 if (asoc->alternate == NULL) {
8234                                         if (asoc->primary_destination != net) {
8235                                                 continue;
8236                                         }
8237                                 } else {
8238                                         if (asoc->alternate != net) {
8239                                                 continue;
8240                                         }
8241                                 }
8242                         } else {
8243                                 if (chk->whoTo != net) {
8244                                         continue;
8245                                 }
8246                         }
8247         skip_net_check:
8248                         if (chk->data == NULL) {
8249                                 continue;
8250                         }
8251                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8252                                 /*
8253                                  * It must be unsent. Cookies and ASCONF's
8254                                  * hang around but there timers will force
8255                                  * when marked for resend.
8256                                  */
8257                                 continue;
8258                         }
8259                         /*
8260                          * if no AUTH is yet included and this chunk
8261                          * requires it, make sure to account for it.  We
8262                          * don't apply the size until the AUTH chunk is
8263                          * actually added below in case there is no room for
8264                          * this chunk. NOTE: we overload the use of "omtu"
8265                          * here
8266                          */
8267                         if ((auth == NULL) &&
8268                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8269                             stcb->asoc.peer_auth_chunks)) {
8270                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8271                         } else
8272                                 omtu = 0;
8273                         /* Here we do NOT factor the r_mtu */
8274                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8275                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8276                                 /*
8277                                  * We probably should glom the mbuf chain
8278                                  * from the chk->data for control but the
8279                                  * problem is it becomes yet one more level
8280                                  * of tracking to do if for some reason
8281                                  * output fails. Then I have got to
8282                                  * reconstruct the merged control chain.. el
8283                                  * yucko.. for now we take the easy way and
8284                                  * do the copy
8285                                  */
8286                                 /*
8287                                  * Add an AUTH chunk, if chunk requires it
8288                                  * save the offset into the chain for AUTH
8289                                  */
8290                                 if ((auth == NULL) &&
8291                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8292                                     stcb->asoc.peer_auth_chunks))) {
8293                                         outchain = sctp_add_auth_chunk(outchain,
8294                                             &endoutchain,
8295                                             &auth,
8296                                             &auth_offset,
8297                                             stcb,
8298                                             chk->rec.chunk_id.id);
8299                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8300                                 }
8301                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8302                                     (int)chk->rec.chunk_id.can_take_data,
8303                                     chk->send_size, chk->copy_by_ref);
8304                                 if (outchain == NULL) {
8305                                         *reason_code = 8;
8306                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8307                                         return (ENOMEM);
8308                                 }
8309                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8310                                 /* update our MTU size */
8311                                 if (mtu > (chk->send_size + omtu))
8312                                         mtu -= (chk->send_size + omtu);
8313                                 else
8314                                         mtu = 0;
8315                                 to_out += (chk->send_size + omtu);
8316                                 /* Do clear IP_DF ? */
8317                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8318                                         no_fragmentflg = 0;
8319                                 }
8320                                 if (chk->rec.chunk_id.can_take_data)
8321                                         chk->data = NULL;
8322                                 /* Mark things to be removed, if needed */
8323                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8324                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8325                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8326                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8327                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8328                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8329                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8330                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8331                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8332                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8333                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8334                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8335                                                 hbflag = 1;
8336                                         }
8337                                         /* remove these chunks at the end */
8338                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8339                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8340                                                 /* turn off the timer */
8341                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8342                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8343                                                             inp, stcb, net,
8344                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8345                                                 }
8346                                         }
8347                                         ctl_cnt++;
8348                                 } else {
8349                                         /*
8350                                          * Other chunks, since they have
8351                                          * timers running (i.e. COOKIE) we
8352                                          * just "trust" that it gets sent or
8353                                          * retransmitted.
8354                                          */
8355                                         ctl_cnt++;
8356                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8357                                                 cookie = 1;
8358                                                 no_out_cnt = 1;
8359                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8360                                                 /*
8361                                                  * Increment ecne send count
8362                                                  * here this means we may be
8363                                                  * over-zealous in our
8364                                                  * counting if the send
8365                                                  * fails, but its the best
8366                                                  * place to do it (we used
8367                                                  * to do it in the queue of
8368                                                  * the chunk, but that did
8369                                                  * not tell how many times
8370                                                  * it was sent.
8371                                                  */
8372                                                 SCTP_STAT_INCR(sctps_sendecne);
8373                                         }
8374                                         chk->sent = SCTP_DATAGRAM_SENT;
8375                                         if (chk->whoTo == NULL) {
8376                                                 chk->whoTo = net;
8377                                                 atomic_add_int(&net->ref_count, 1);
8378                                         }
8379                                         chk->snd_count++;
8380                                 }
8381                                 if (mtu == 0) {
8382                                         /*
8383                                          * Ok we are out of room but we can
8384                                          * output without effecting the
8385                                          * flight size since this little guy
8386                                          * is a control only packet.
8387                                          */
8388                                         if (asconf) {
8389                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8390                                                 /*
8391                                                  * do NOT clear the asconf
8392                                                  * flag as it is used to do
8393                                                  * appropriate source
8394                                                  * address selection.
8395                                                  */
8396                                         }
8397                                         if (cookie) {
8398                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8399                                                 cookie = 0;
8400                                         }
8401                                         /* Only HB or ASCONF advances time */
8402                                         if (hbflag) {
8403                                                 if (*now_filled == 0) {
8404                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8405                                                         *now_filled = 1;
8406                                                 }
8407                                                 net->last_sent_time = *now;
8408                                                 hbflag = 0;
8409                                         }
8410                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8411                                             (struct sockaddr *)&net->ro._l_addr,
8412                                             outchain,
8413                                             auth_offset, auth,
8414                                             stcb->asoc.authinfo.active_keyid,
8415                                             no_fragmentflg, 0, asconf,
8416                                             inp->sctp_lport, stcb->rport,
8417                                             htonl(stcb->asoc.peer_vtag),
8418                                             net->port, NULL,
8419                                             0, 0,
8420                                             so_locked))) {
8421                                                 /*
8422                                                  * error, we could not
8423                                                  * output
8424                                                  */
8425                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8426                                                 if (from_where == 0) {
8427                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8428                                                 }
8429                                                 if (error == ENOBUFS) {
8430                                                         asoc->ifp_had_enobuf = 1;
8431                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8432                                                 }
8433                                                 if (error == EHOSTUNREACH) {
8434                                                         /*
8435                                                          * Destination went
8436                                                          * unreachable
8437                                                          * during this send
8438                                                          */
8439                                                         sctp_move_chunks_from_net(stcb, net);
8440                                                 }
8441                                                 *reason_code = 7;
8442                                                 break;
8443                                         } else {
8444                                                 asoc->ifp_had_enobuf = 0;
8445                                         }
8446                                         /*
8447                                          * increase the number we sent, if a
8448                                          * cookie is sent we don't tell them
8449                                          * any was sent out.
8450                                          */
8451                                         outchain = endoutchain = NULL;
8452                                         auth = NULL;
8453                                         auth_offset = 0;
8454                                         if (!no_out_cnt)
8455                                                 *num_out += ctl_cnt;
8456                                         /* recalc a clean slate and setup */
8457                                         switch (net->ro._l_addr.sa.sa_family) {
8458 #ifdef INET
8459                                         case AF_INET:
8460                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8461                                                 break;
8462 #endif
8463 #ifdef INET6
8464                                         case AF_INET6:
8465                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8466                                                 break;
8467 #endif
8468                                         default:
8469                                                 /* TSNH */
8470                                                 mtu = net->mtu;
8471                                                 break;
8472                                         }
8473                                         to_out = 0;
8474                                         no_fragmentflg = 1;
8475                                 }
8476                         }
8477                 }
8478                 if (error != 0) {
8479                         /* try next net */
8480                         continue;
8481                 }
8482                 /* JRI: if dest is in PF state, do not send data to it */
8483                 if ((asoc->sctp_cmt_on_off > 0) &&
8484                     (net != stcb->asoc.alternate) &&
8485                     (net->dest_state & SCTP_ADDR_PF)) {
8486                         goto no_data_fill;
8487                 }
8488                 if (net->flight_size >= net->cwnd) {
8489                         goto no_data_fill;
8490                 }
8491                 if ((asoc->sctp_cmt_on_off > 0) &&
8492                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8493                     (net->flight_size > max_rwnd_per_dest)) {
8494                         goto no_data_fill;
8495                 }
8496                 /*
8497                  * We need a specific accounting for the usage of the send
8498                  * buffer. We also need to check the number of messages per
8499                  * net. For now, this is better than nothing and it disabled
8500                  * by default...
8501                  */
8502                 if ((asoc->sctp_cmt_on_off > 0) &&
8503                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8504                     (max_send_per_dest > 0) &&
8505                     (net->flight_size > max_send_per_dest)) {
8506                         goto no_data_fill;
8507                 }
8508                 /*********************/
8509                 /* Data transmission */
8510                 /*********************/
8511                 /*
8512                  * if AUTH for DATA is required and no AUTH has been added
8513                  * yet, account for this in the mtu now... if no data can be
8514                  * bundled, this adjustment won't matter anyways since the
8515                  * packet will be going out...
8516                  */
8517                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8518                     stcb->asoc.peer_auth_chunks);
8519                 if (data_auth_reqd && (auth == NULL)) {
8520                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8521                 }
8522                 /* now lets add any data within the MTU constraints */
8523                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8524 #ifdef INET
8525                 case AF_INET:
8526                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8527                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8528                         else
8529                                 omtu = 0;
8530                         break;
8531 #endif
8532 #ifdef INET6
8533                 case AF_INET6:
8534                         if (net->mtu > SCTP_MIN_OVERHEAD)
8535                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8536                         else
8537                                 omtu = 0;
8538                         break;
8539 #endif
8540                 default:
8541                         /* TSNH */
8542                         omtu = 0;
8543                         break;
8544                 }
8545                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8546                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8547                     (skip_data_for_this_net == 0)) ||
8548                     (cookie)) {
8549                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8550                                 if (no_data_chunks) {
8551                                         /* let only control go out */
8552                                         *reason_code = 1;
8553                                         break;
8554                                 }
8555                                 if (net->flight_size >= net->cwnd) {
8556                                         /* skip this net, no room for data */
8557                                         *reason_code = 2;
8558                                         break;
8559                                 }
8560                                 if ((chk->whoTo != NULL) &&
8561                                     (chk->whoTo != net)) {
8562                                         /* Don't send the chunk on this net */
8563                                         continue;
8564                                 }
8565                                 if (asoc->sctp_cmt_on_off == 0) {
8566                                         if ((asoc->alternate) &&
8567                                             (asoc->alternate != net) &&
8568                                             (chk->whoTo == NULL)) {
8569                                                 continue;
8570                                         } else if ((net != asoc->primary_destination) &&
8571                                                     (asoc->alternate == NULL) &&
8572                                             (chk->whoTo == NULL)) {
8573                                                 continue;
8574                                         }
8575                                 }
8576                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8577                                         /*-
8578                                          * strange, we have a chunk that is
8579                                          * to big for its destination and
8580                                          * yet no fragment ok flag.
8581                                          * Something went wrong when the
8582                                          * PMTU changed...we did not mark
8583                                          * this chunk for some reason?? I
8584                                          * will fix it here by letting IP
8585                                          * fragment it for now and printing
8586                                          * a warning. This really should not
8587                                          * happen ...
8588                                          */
8589                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8590                                             chk->send_size, mtu);
8591                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8592                                 }
8593                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8594                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8595                                         struct sctp_data_chunk *dchkh;
8596
8597                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8598                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8599                                 }
8600                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8601                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8602                                         /* ok we will add this one */
8603
8604                                         /*
8605                                          * Add an AUTH chunk, if chunk
8606                                          * requires it, save the offset into
8607                                          * the chain for AUTH
8608                                          */
8609                                         if (data_auth_reqd) {
8610                                                 if (auth == NULL) {
8611                                                         outchain = sctp_add_auth_chunk(outchain,
8612                                                             &endoutchain,
8613                                                             &auth,
8614                                                             &auth_offset,
8615                                                             stcb,
8616                                                             SCTP_DATA);
8617                                                         auth_keyid = chk->auth_keyid;
8618                                                         override_ok = 0;
8619                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8620                                                 } else if (override_ok) {
8621                                                         /*
8622                                                          * use this data's
8623                                                          * keyid
8624                                                          */
8625                                                         auth_keyid = chk->auth_keyid;
8626                                                         override_ok = 0;
8627                                                 } else if (auth_keyid != chk->auth_keyid) {
8628                                                         /*
8629                                                          * different keyid,
8630                                                          * so done bundling
8631                                                          */
8632                                                         break;
8633                                                 }
8634                                         }
8635                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8636                                             chk->send_size, chk->copy_by_ref);
8637                                         if (outchain == NULL) {
8638                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8639                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8640                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8641                                                 }
8642                                                 *reason_code = 3;
8643                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8644                                                 return (ENOMEM);
8645                                         }
8646                                         /* upate our MTU size */
8647                                         /* Do clear IP_DF ? */
8648                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8649                                                 no_fragmentflg = 0;
8650                                         }
8651                                         /* unsigned subtraction of mtu */
8652                                         if (mtu > chk->send_size)
8653                                                 mtu -= chk->send_size;
8654                                         else
8655                                                 mtu = 0;
8656                                         /* unsigned subtraction of r_mtu */
8657                                         if (r_mtu > chk->send_size)
8658                                                 r_mtu -= chk->send_size;
8659                                         else
8660                                                 r_mtu = 0;
8661
8662                                         to_out += chk->send_size;
8663                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8664 #ifdef INVARIANTS
8665                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8666 #else
8667                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8668                                                     mx_mtu, to_out);
8669 #endif
8670                                         }
8671                                         chk->window_probe = 0;
8672                                         data_list[bundle_at++] = chk;
8673                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8674                                                 break;
8675                                         }
8676                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8677                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8678                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8679                                                 } else {
8680                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8681                                                 }
8682                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8683                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8684                                                         /*
8685                                                          * Count number of
8686                                                          * user msg's that
8687                                                          * were fragmented
8688                                                          * we do this by
8689                                                          * counting when we
8690                                                          * see a LAST
8691                                                          * fragment only.
8692                                                          */
8693                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8694                                         }
8695                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8696                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8697                                                         data_list[0]->window_probe = 1;
8698                                                         net->window_probe = 1;
8699                                                 }
8700                                                 break;
8701                                         }
8702                                 } else {
8703                                         /*
8704                                          * Must be sent in order of the
8705                                          * TSN's (on a network)
8706                                          */
8707                                         break;
8708                                 }
8709                         }       /* for (chunk gather loop for this net) */
8710                 }               /* if asoc.state OPEN */
8711 no_data_fill:
8712                 /* Is there something to send for this destination? */
8713                 if (outchain) {
8714                         /* We may need to start a control timer or two */
8715                         if (asconf) {
8716                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8717                                     stcb, net);
8718                                 /*
8719                                  * do NOT clear the asconf flag as it is
8720                                  * used to do appropriate source address
8721                                  * selection.
8722                                  */
8723                         }
8724                         if (cookie) {
8725                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8726                                 cookie = 0;
8727                         }
8728                         /* must start a send timer if data is being sent */
8729                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8730                                 /*
8731                                  * no timer running on this destination
8732                                  * restart it.
8733                                  */
8734                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8735                         }
8736                         if (bundle_at || hbflag) {
8737                                 /* For data/asconf and hb set time */
8738                                 if (*now_filled == 0) {
8739                                         (void)SCTP_GETTIME_TIMEVAL(now);
8740                                         *now_filled = 1;
8741                                 }
8742                                 net->last_sent_time = *now;
8743                         }
8744                         /* Now send it, if there is anything to send :> */
8745                         if ((error = sctp_lowlevel_chunk_output(inp,
8746                             stcb,
8747                             net,
8748                             (struct sockaddr *)&net->ro._l_addr,
8749                             outchain,
8750                             auth_offset,
8751                             auth,
8752                             auth_keyid,
8753                             no_fragmentflg,
8754                             bundle_at,
8755                             asconf,
8756                             inp->sctp_lport, stcb->rport,
8757                             htonl(stcb->asoc.peer_vtag),
8758                             net->port, NULL,
8759                             0, 0,
8760                             so_locked))) {
8761                                 /* error, we could not output */
8762                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8763                                 if (from_where == 0) {
8764                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8765                                 }
8766                                 if (error == ENOBUFS) {
8767                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8768                                         asoc->ifp_had_enobuf = 1;
8769                                 }
8770                                 if (error == EHOSTUNREACH) {
8771                                         /*
8772                                          * Destination went unreachable
8773                                          * during this send
8774                                          */
8775                                         sctp_move_chunks_from_net(stcb, net);
8776                                 }
8777                                 *reason_code = 6;
8778                                 /*-
8779                                  * I add this line to be paranoid. As far as
8780                                  * I can tell the continue, takes us back to
8781                                  * the top of the for, but just to make sure
8782                                  * I will reset these again here.
8783                                  */
8784                                 ctl_cnt = bundle_at = 0;
8785                                 continue;       /* This takes us back to the
8786                                                  * for() for the nets. */
8787                         } else {
8788                                 asoc->ifp_had_enobuf = 0;
8789                         }
8790                         endoutchain = NULL;
8791                         auth = NULL;
8792                         auth_offset = 0;
8793                         if (!no_out_cnt) {
8794                                 *num_out += (ctl_cnt + bundle_at);
8795                         }
8796                         if (bundle_at) {
8797                                 /* setup for a RTO measurement */
8798                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8799                                 /* fill time if not already filled */
8800                                 if (*now_filled == 0) {
8801                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8802                                         *now_filled = 1;
8803                                         *now = asoc->time_last_sent;
8804                                 } else {
8805                                         asoc->time_last_sent = *now;
8806                                 }
8807                                 if (net->rto_needed) {
8808                                         data_list[0]->do_rtt = 1;
8809                                         net->rto_needed = 0;
8810                                 }
8811                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8812                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8813                         }
8814                         if (one_chunk) {
8815                                 break;
8816                         }
8817                 }
8818                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8819                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8820                 }
8821         }
8822         if (old_start_at == NULL) {
8823                 old_start_at = start_at;
8824                 start_at = TAILQ_FIRST(&asoc->nets);
8825                 if (old_start_at)
8826                         goto again_one_more_time;
8827         }
8828         /*
8829          * At the end there should be no NON timed chunks hanging on this
8830          * queue.
8831          */
8832         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8833                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8834         }
8835         if ((*num_out == 0) && (*reason_code == 0)) {
8836                 *reason_code = 4;
8837         } else {
8838                 *reason_code = 5;
8839         }
8840         sctp_clean_up_ctl(stcb, asoc, so_locked);
8841         return (0);
8842 }
8843
8844 void
8845 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8846 {
8847         /*-
8848          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8849          * the control chunk queue.
8850          */
8851         struct sctp_chunkhdr *hdr;
8852         struct sctp_tmit_chunk *chk;
8853         struct mbuf *mat;
8854
8855         SCTP_TCB_LOCK_ASSERT(stcb);
8856         sctp_alloc_a_chunk(stcb, chk);
8857         if (chk == NULL) {
8858                 /* no memory */
8859                 sctp_m_freem(op_err);
8860                 return;
8861         }
8862         chk->copy_by_ref = 0;
8863         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8864         if (op_err == NULL) {
8865                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8866                 return;
8867         }
8868         chk->send_size = 0;
8869         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8870                 chk->send_size += SCTP_BUF_LEN(mat);
8871         }
8872         chk->sent = SCTP_DATAGRAM_UNSENT;
8873         chk->snd_count = 0;
8874         chk->asoc = &stcb->asoc;
8875         chk->data = op_err;
8876         chk->whoTo = NULL;
8877         hdr = mtod(op_err, struct sctp_chunkhdr *);
8878         hdr->chunk_type = SCTP_OPERATION_ERROR;
8879         hdr->chunk_flags = 0;
8880         hdr->chunk_length = htons(chk->send_size);
8881         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8882             chk,
8883             sctp_next);
8884         chk->asoc->ctrl_queue_cnt++;
8885 }
8886
8887 int
8888 sctp_send_cookie_echo(struct mbuf *m,
8889     int offset,
8890     struct sctp_tcb *stcb,
8891     struct sctp_nets *net)
8892 {
8893         /*-
8894          * pull out the cookie and put it at the front of the control chunk
8895          * queue.
8896          */
8897         int at;
8898         struct mbuf *cookie;
8899         struct sctp_paramhdr parm, *phdr;
8900         struct sctp_chunkhdr *hdr;
8901         struct sctp_tmit_chunk *chk;
8902         uint16_t ptype, plen;
8903
8904         SCTP_TCB_LOCK_ASSERT(stcb);
8905         /* First find the cookie in the param area */
8906         cookie = NULL;
8907         at = offset + sizeof(struct sctp_init_chunk);
8908         for (;;) {
8909                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8910                 if (phdr == NULL) {
8911                         return (-3);
8912                 }
8913                 ptype = ntohs(phdr->param_type);
8914                 plen = ntohs(phdr->param_length);
8915                 if (ptype == SCTP_STATE_COOKIE) {
8916                         int pad;
8917
8918                         /* found the cookie */
8919                         if ((pad = (plen % 4))) {
8920                                 plen += 4 - pad;
8921                         }
8922                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8923                         if (cookie == NULL) {
8924                                 /* No memory */
8925                                 return (-2);
8926                         }
8927 #ifdef SCTP_MBUF_LOGGING
8928                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8929                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8930                         }
8931 #endif
8932                         break;
8933                 }
8934                 at += SCTP_SIZE32(plen);
8935         }
8936         /* ok, we got the cookie lets change it into a cookie echo chunk */
8937         /* first the change from param to cookie */
8938         hdr = mtod(cookie, struct sctp_chunkhdr *);
8939         hdr->chunk_type = SCTP_COOKIE_ECHO;
8940         hdr->chunk_flags = 0;
8941         /* get the chunk stuff now and place it in the FRONT of the queue */
8942         sctp_alloc_a_chunk(stcb, chk);
8943         if (chk == NULL) {
8944                 /* no memory */
8945                 sctp_m_freem(cookie);
8946                 return (-5);
8947         }
8948         chk->copy_by_ref = 0;
8949         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8950         chk->rec.chunk_id.can_take_data = 0;
8951         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8952         chk->send_size = plen;
8953         chk->sent = SCTP_DATAGRAM_UNSENT;
8954         chk->snd_count = 0;
8955         chk->asoc = &stcb->asoc;
8956         chk->data = cookie;
8957         chk->whoTo = net;
8958         atomic_add_int(&chk->whoTo->ref_count, 1);
8959         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8960         chk->asoc->ctrl_queue_cnt++;
8961         return (0);
8962 }
8963
8964 void
8965 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8966     struct mbuf *m,
8967     int offset,
8968     int chk_length,
8969     struct sctp_nets *net)
8970 {
8971         /*
8972          * take a HB request and make it into a HB ack and send it.
8973          */
8974         struct mbuf *outchain;
8975         struct sctp_chunkhdr *chdr;
8976         struct sctp_tmit_chunk *chk;
8977
8978
8979         if (net == NULL)
8980                 /* must have a net pointer */
8981                 return;
8982
8983         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
8984         if (outchain == NULL) {
8985                 /* gak out of memory */
8986                 return;
8987         }
8988 #ifdef SCTP_MBUF_LOGGING
8989         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8990                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
8991         }
8992 #endif
8993         chdr = mtod(outchain, struct sctp_chunkhdr *);
8994         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8995         chdr->chunk_flags = 0;
8996         if (chk_length % 4) {
8997                 /* need pad */
8998                 uint32_t cpthis = 0;
8999                 int padlen;
9000
9001                 padlen = 4 - (chk_length % 4);
9002                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9003         }
9004         sctp_alloc_a_chunk(stcb, chk);
9005         if (chk == NULL) {
9006                 /* no memory */
9007                 sctp_m_freem(outchain);
9008                 return;
9009         }
9010         chk->copy_by_ref = 0;
9011         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9012         chk->rec.chunk_id.can_take_data = 1;
9013         chk->flags = 0;
9014         chk->send_size = chk_length;
9015         chk->sent = SCTP_DATAGRAM_UNSENT;
9016         chk->snd_count = 0;
9017         chk->asoc = &stcb->asoc;
9018         chk->data = outchain;
9019         chk->whoTo = net;
9020         atomic_add_int(&chk->whoTo->ref_count, 1);
9021         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9022         chk->asoc->ctrl_queue_cnt++;
9023 }
9024
9025 void
9026 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9027 {
9028         /* formulate and queue a cookie-ack back to sender */
9029         struct mbuf *cookie_ack;
9030         struct sctp_chunkhdr *hdr;
9031         struct sctp_tmit_chunk *chk;
9032
9033         SCTP_TCB_LOCK_ASSERT(stcb);
9034
9035         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9036         if (cookie_ack == NULL) {
9037                 /* no mbuf's */
9038                 return;
9039         }
9040         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9041         sctp_alloc_a_chunk(stcb, chk);
9042         if (chk == NULL) {
9043                 /* no memory */
9044                 sctp_m_freem(cookie_ack);
9045                 return;
9046         }
9047         chk->copy_by_ref = 0;
9048         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9049         chk->rec.chunk_id.can_take_data = 1;
9050         chk->flags = 0;
9051         chk->send_size = sizeof(struct sctp_chunkhdr);
9052         chk->sent = SCTP_DATAGRAM_UNSENT;
9053         chk->snd_count = 0;
9054         chk->asoc = &stcb->asoc;
9055         chk->data = cookie_ack;
9056         if (chk->asoc->last_control_chunk_from != NULL) {
9057                 chk->whoTo = chk->asoc->last_control_chunk_from;
9058                 atomic_add_int(&chk->whoTo->ref_count, 1);
9059         } else {
9060                 chk->whoTo = NULL;
9061         }
9062         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9063         hdr->chunk_type = SCTP_COOKIE_ACK;
9064         hdr->chunk_flags = 0;
9065         hdr->chunk_length = htons(chk->send_size);
9066         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9067         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9068         chk->asoc->ctrl_queue_cnt++;
9069         return;
9070 }
9071
9072
9073 void
9074 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9075 {
9076         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9077         struct mbuf *m_shutdown_ack;
9078         struct sctp_shutdown_ack_chunk *ack_cp;
9079         struct sctp_tmit_chunk *chk;
9080
9081         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9082         if (m_shutdown_ack == NULL) {
9083                 /* no mbuf's */
9084                 return;
9085         }
9086         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9087         sctp_alloc_a_chunk(stcb, chk);
9088         if (chk == NULL) {
9089                 /* no memory */
9090                 sctp_m_freem(m_shutdown_ack);
9091                 return;
9092         }
9093         chk->copy_by_ref = 0;
9094         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9095         chk->rec.chunk_id.can_take_data = 1;
9096         chk->flags = 0;
9097         chk->send_size = sizeof(struct sctp_chunkhdr);
9098         chk->sent = SCTP_DATAGRAM_UNSENT;
9099         chk->snd_count = 0;
9100         chk->flags = 0;
9101         chk->asoc = &stcb->asoc;
9102         chk->data = m_shutdown_ack;
9103         chk->whoTo = net;
9104         if (chk->whoTo) {
9105                 atomic_add_int(&chk->whoTo->ref_count, 1);
9106         }
9107         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9108         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9109         ack_cp->ch.chunk_flags = 0;
9110         ack_cp->ch.chunk_length = htons(chk->send_size);
9111         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9112         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9113         chk->asoc->ctrl_queue_cnt++;
9114         return;
9115 }
9116
9117 void
9118 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9119 {
9120         /* formulate and queue a SHUTDOWN to the sender */
9121         struct mbuf *m_shutdown;
9122         struct sctp_shutdown_chunk *shutdown_cp;
9123         struct sctp_tmit_chunk *chk;
9124
9125         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9126         if (m_shutdown == NULL) {
9127                 /* no mbuf's */
9128                 return;
9129         }
9130         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9131         sctp_alloc_a_chunk(stcb, chk);
9132         if (chk == NULL) {
9133                 /* no memory */
9134                 sctp_m_freem(m_shutdown);
9135                 return;
9136         }
9137         chk->copy_by_ref = 0;
9138         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9139         chk->rec.chunk_id.can_take_data = 1;
9140         chk->flags = 0;
9141         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9142         chk->sent = SCTP_DATAGRAM_UNSENT;
9143         chk->snd_count = 0;
9144         chk->flags = 0;
9145         chk->asoc = &stcb->asoc;
9146         chk->data = m_shutdown;
9147         chk->whoTo = net;
9148         if (chk->whoTo) {
9149                 atomic_add_int(&chk->whoTo->ref_count, 1);
9150         }
9151         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9152         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9153         shutdown_cp->ch.chunk_flags = 0;
9154         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9155         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9156         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9157         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9158         chk->asoc->ctrl_queue_cnt++;
9159         return;
9160 }
9161
9162 void
9163 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9164 {
9165         /*
9166          * formulate and queue an ASCONF to the peer. ASCONF parameters
9167          * should be queued on the assoc queue.
9168          */
9169         struct sctp_tmit_chunk *chk;
9170         struct mbuf *m_asconf;
9171         int len;
9172
9173         SCTP_TCB_LOCK_ASSERT(stcb);
9174
9175         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9176             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9177                 /* can't send a new one if there is one in flight already */
9178                 return;
9179         }
9180         /* compose an ASCONF chunk, maximum length is PMTU */
9181         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9182         if (m_asconf == NULL) {
9183                 return;
9184         }
9185         sctp_alloc_a_chunk(stcb, chk);
9186         if (chk == NULL) {
9187                 /* no memory */
9188                 sctp_m_freem(m_asconf);
9189                 return;
9190         }
9191         chk->copy_by_ref = 0;
9192         chk->rec.chunk_id.id = SCTP_ASCONF;
9193         chk->rec.chunk_id.can_take_data = 0;
9194         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9195         chk->data = m_asconf;
9196         chk->send_size = len;
9197         chk->sent = SCTP_DATAGRAM_UNSENT;
9198         chk->snd_count = 0;
9199         chk->asoc = &stcb->asoc;
9200         chk->whoTo = net;
9201         if (chk->whoTo) {
9202                 atomic_add_int(&chk->whoTo->ref_count, 1);
9203         }
9204         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9205         chk->asoc->ctrl_queue_cnt++;
9206         return;
9207 }
9208
9209 void
9210 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9211 {
9212         /*
9213          * formulate and queue a asconf-ack back to sender. the asconf-ack
9214          * must be stored in the tcb.
9215          */
9216         struct sctp_tmit_chunk *chk;
9217         struct sctp_asconf_ack *ack, *latest_ack;
9218         struct mbuf *m_ack;
9219         struct sctp_nets *net = NULL;
9220
9221         SCTP_TCB_LOCK_ASSERT(stcb);
9222         /* Get the latest ASCONF-ACK */
9223         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9224         if (latest_ack == NULL) {
9225                 return;
9226         }
9227         if (latest_ack->last_sent_to != NULL &&
9228             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9229                 /* we're doing a retransmission */
9230                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9231                 if (net == NULL) {
9232                         /* no alternate */
9233                         if (stcb->asoc.last_control_chunk_from == NULL) {
9234                                 if (stcb->asoc.alternate) {
9235                                         net = stcb->asoc.alternate;
9236                                 } else {
9237                                         net = stcb->asoc.primary_destination;
9238                                 }
9239                         } else {
9240                                 net = stcb->asoc.last_control_chunk_from;
9241                         }
9242                 }
9243         } else {
9244                 /* normal case */
9245                 if (stcb->asoc.last_control_chunk_from == NULL) {
9246                         if (stcb->asoc.alternate) {
9247                                 net = stcb->asoc.alternate;
9248                         } else {
9249                                 net = stcb->asoc.primary_destination;
9250                         }
9251                 } else {
9252                         net = stcb->asoc.last_control_chunk_from;
9253                 }
9254         }
9255         latest_ack->last_sent_to = net;
9256
9257         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9258                 if (ack->data == NULL) {
9259                         continue;
9260                 }
9261                 /* copy the asconf_ack */
9262                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9263                 if (m_ack == NULL) {
9264                         /* couldn't copy it */
9265                         return;
9266                 }
9267 #ifdef SCTP_MBUF_LOGGING
9268                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9269                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9270                 }
9271 #endif
9272
9273                 sctp_alloc_a_chunk(stcb, chk);
9274                 if (chk == NULL) {
9275                         /* no memory */
9276                         if (m_ack)
9277                                 sctp_m_freem(m_ack);
9278                         return;
9279                 }
9280                 chk->copy_by_ref = 0;
9281                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9282                 chk->rec.chunk_id.can_take_data = 1;
9283                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9284                 chk->whoTo = net;
9285                 if (chk->whoTo) {
9286                         atomic_add_int(&chk->whoTo->ref_count, 1);
9287                 }
9288                 chk->data = m_ack;
9289                 chk->send_size = ack->len;
9290                 chk->sent = SCTP_DATAGRAM_UNSENT;
9291                 chk->snd_count = 0;
9292                 chk->asoc = &stcb->asoc;
9293
9294                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9295                 chk->asoc->ctrl_queue_cnt++;
9296         }
9297         return;
9298 }
9299
9300
9301 static int
9302 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9303     struct sctp_tcb *stcb,
9304     struct sctp_association *asoc,
9305     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9306 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9307     SCTP_UNUSED
9308 #endif
9309 )
9310 {
9311         /*-
9312          * send out one MTU of retransmission. If fast_retransmit is
9313          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9314          * rwnd. For a Cookie or Asconf in the control chunk queue we
9315          * retransmit them by themselves.
9316          *
9317          * For data chunks we will pick out the lowest TSN's in the sent_queue
9318          * marked for resend and bundle them all together (up to a MTU of
9319          * destination). The address to send to should have been
9320          * selected/changed where the retransmission was marked (i.e. in FR
9321          * or t3-timeout routines).
9322          */
9323         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9324         struct sctp_tmit_chunk *chk, *fwd;
9325         struct mbuf *m, *endofchain;
9326         struct sctp_nets *net = NULL;
9327         uint32_t tsns_sent = 0;
9328         int no_fragmentflg, bundle_at, cnt_thru;
9329         unsigned int mtu;
9330         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9331         struct sctp_auth_chunk *auth = NULL;
9332         uint32_t auth_offset = 0;
9333         uint16_t auth_keyid;
9334         int override_ok = 1;
9335         int data_auth_reqd = 0;
9336         uint32_t dmtu = 0;
9337
9338         SCTP_TCB_LOCK_ASSERT(stcb);
9339         tmr_started = ctl_cnt = bundle_at = error = 0;
9340         no_fragmentflg = 1;
9341         fwd_tsn = 0;
9342         *cnt_out = 0;
9343         fwd = NULL;
9344         endofchain = m = NULL;
9345         auth_keyid = stcb->asoc.authinfo.active_keyid;
9346 #ifdef SCTP_AUDITING_ENABLED
9347         sctp_audit_log(0xC3, 1);
9348 #endif
9349         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9350             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9351                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9352                     asoc->sent_queue_retran_cnt);
9353                 asoc->sent_queue_cnt = 0;
9354                 asoc->sent_queue_cnt_removeable = 0;
9355                 /* send back 0/0 so we enter normal transmission */
9356                 *cnt_out = 0;
9357                 return (0);
9358         }
9359         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9360                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9361                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9362                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9363                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9364                                 continue;
9365                         }
9366                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9367                                 if (chk != asoc->str_reset) {
9368                                         /*
9369                                          * not eligible for retran if its
9370                                          * not ours
9371                                          */
9372                                         continue;
9373                                 }
9374                         }
9375                         ctl_cnt++;
9376                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9377                                 fwd_tsn = 1;
9378                         }
9379                         /*
9380                          * Add an AUTH chunk, if chunk requires it save the
9381                          * offset into the chain for AUTH
9382                          */
9383                         if ((auth == NULL) &&
9384                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9385                             stcb->asoc.peer_auth_chunks))) {
9386                                 m = sctp_add_auth_chunk(m, &endofchain,
9387                                     &auth, &auth_offset,
9388                                     stcb,
9389                                     chk->rec.chunk_id.id);
9390                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9391                         }
9392                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9393                         break;
9394                 }
9395         }
9396         one_chunk = 0;
9397         cnt_thru = 0;
9398         /* do we have control chunks to retransmit? */
9399         if (m != NULL) {
9400                 /* Start a timer no matter if we suceed or fail */
9401                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9402                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9403                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9404                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9405                 chk->snd_count++;       /* update our count */
9406                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9407                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9408                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9409                     no_fragmentflg, 0, 0,
9410                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9411                     chk->whoTo->port, NULL,
9412                     0, 0,
9413                     so_locked))) {
9414                         SCTP_STAT_INCR(sctps_lowlevelerr);
9415                         return (error);
9416                 }
9417                 endofchain = NULL;
9418                 auth = NULL;
9419                 auth_offset = 0;
9420                 /*
9421                  * We don't want to mark the net->sent time here since this
9422                  * we use this for HB and retrans cannot measure RTT
9423                  */
9424                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9425                 *cnt_out += 1;
9426                 chk->sent = SCTP_DATAGRAM_SENT;
9427                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9428                 if (fwd_tsn == 0) {
9429                         return (0);
9430                 } else {
9431                         /* Clean up the fwd-tsn list */
9432                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9433                         return (0);
9434                 }
9435         }
9436         /*
9437          * Ok, it is just data retransmission we need to do or that and a
9438          * fwd-tsn with it all.
9439          */
9440         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9441                 return (SCTP_RETRAN_DONE);
9442         }
9443         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9444             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9445                 /* not yet open, resend the cookie and that is it */
9446                 return (1);
9447         }
9448 #ifdef SCTP_AUDITING_ENABLED
9449         sctp_auditing(20, inp, stcb, NULL);
9450 #endif
9451         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9452         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9453                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9454                         /* No, not sent to this net or not ready for rtx */
9455                         continue;
9456                 }
9457                 if (chk->data == NULL) {
9458                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9459                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9460                         continue;
9461                 }
9462                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9463                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9464                         struct mbuf *op_err;
9465                         char msg[SCTP_DIAG_INFO_LEN];
9466
9467                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9468                             chk->rec.data.TSN_seq, chk->snd_count);
9469                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9470                             msg);
9471                         atomic_add_int(&stcb->asoc.refcnt, 1);
9472                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9473                             so_locked);
9474                         SCTP_TCB_LOCK(stcb);
9475                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9476                         return (SCTP_RETRAN_EXIT);
9477                 }
9478                 /* pick up the net */
9479                 net = chk->whoTo;
9480                 switch (net->ro._l_addr.sa.sa_family) {
9481 #ifdef INET
9482                 case AF_INET:
9483                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9484                         break;
9485 #endif
9486 #ifdef INET6
9487                 case AF_INET6:
9488                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9489                         break;
9490 #endif
9491                 default:
9492                         /* TSNH */
9493                         mtu = net->mtu;
9494                         break;
9495                 }
9496
9497                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9498                         /* No room in peers rwnd */
9499                         uint32_t tsn;
9500
9501                         tsn = asoc->last_acked_seq + 1;
9502                         if (tsn == chk->rec.data.TSN_seq) {
9503                                 /*
9504                                  * we make a special exception for this
9505                                  * case. The peer has no rwnd but is missing
9506                                  * the lowest chunk.. which is probably what
9507                                  * is holding up the rwnd.
9508                                  */
9509                                 goto one_chunk_around;
9510                         }
9511                         return (1);
9512                 }
9513 one_chunk_around:
9514                 if (asoc->peers_rwnd < mtu) {
9515                         one_chunk = 1;
9516                         if ((asoc->peers_rwnd == 0) &&
9517                             (asoc->total_flight == 0)) {
9518                                 chk->window_probe = 1;
9519                                 chk->whoTo->window_probe = 1;
9520                         }
9521                 }
9522 #ifdef SCTP_AUDITING_ENABLED
9523                 sctp_audit_log(0xC3, 2);
9524 #endif
9525                 bundle_at = 0;
9526                 m = NULL;
9527                 net->fast_retran_ip = 0;
9528                 if (chk->rec.data.doing_fast_retransmit == 0) {
9529                         /*
9530                          * if no FR in progress skip destination that have
9531                          * flight_size > cwnd.
9532                          */
9533                         if (net->flight_size >= net->cwnd) {
9534                                 continue;
9535                         }
9536                 } else {
9537                         /*
9538                          * Mark the destination net to have FR recovery
9539                          * limits put on it.
9540                          */
9541                         *fr_done = 1;
9542                         net->fast_retran_ip = 1;
9543                 }
9544
9545                 /*
9546                  * if no AUTH is yet included and this chunk requires it,
9547                  * make sure to account for it.  We don't apply the size
9548                  * until the AUTH chunk is actually added below in case
9549                  * there is no room for this chunk.
9550                  */
9551                 if (data_auth_reqd && (auth == NULL)) {
9552                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9553                 } else
9554                         dmtu = 0;
9555
9556                 if ((chk->send_size <= (mtu - dmtu)) ||
9557                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9558                         /* ok we will add this one */
9559                         if (data_auth_reqd) {
9560                                 if (auth == NULL) {
9561                                         m = sctp_add_auth_chunk(m,
9562                                             &endofchain,
9563                                             &auth,
9564                                             &auth_offset,
9565                                             stcb,
9566                                             SCTP_DATA);
9567                                         auth_keyid = chk->auth_keyid;
9568                                         override_ok = 0;
9569                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9570                                 } else if (override_ok) {
9571                                         auth_keyid = chk->auth_keyid;
9572                                         override_ok = 0;
9573                                 } else if (chk->auth_keyid != auth_keyid) {
9574                                         /* different keyid, so done bundling */
9575                                         break;
9576                                 }
9577                         }
9578                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9579                         if (m == NULL) {
9580                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9581                                 return (ENOMEM);
9582                         }
9583                         /* Do clear IP_DF ? */
9584                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9585                                 no_fragmentflg = 0;
9586                         }
9587                         /* upate our MTU size */
9588                         if (mtu > (chk->send_size + dmtu))
9589                                 mtu -= (chk->send_size + dmtu);
9590                         else
9591                                 mtu = 0;
9592                         data_list[bundle_at++] = chk;
9593                         if (one_chunk && (asoc->total_flight <= 0)) {
9594                                 SCTP_STAT_INCR(sctps_windowprobed);
9595                         }
9596                 }
9597                 if (one_chunk == 0) {
9598                         /*
9599                          * now are there anymore forward from chk to pick
9600                          * up?
9601                          */
9602                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9603                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9604                                         /* Nope, not for retran */
9605                                         continue;
9606                                 }
9607                                 if (fwd->whoTo != net) {
9608                                         /* Nope, not the net in question */
9609                                         continue;
9610                                 }
9611                                 if (data_auth_reqd && (auth == NULL)) {
9612                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9613                                 } else
9614                                         dmtu = 0;
9615                                 if (fwd->send_size <= (mtu - dmtu)) {
9616                                         if (data_auth_reqd) {
9617                                                 if (auth == NULL) {
9618                                                         m = sctp_add_auth_chunk(m,
9619                                                             &endofchain,
9620                                                             &auth,
9621                                                             &auth_offset,
9622                                                             stcb,
9623                                                             SCTP_DATA);
9624                                                         auth_keyid = fwd->auth_keyid;
9625                                                         override_ok = 0;
9626                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9627                                                 } else if (override_ok) {
9628                                                         auth_keyid = fwd->auth_keyid;
9629                                                         override_ok = 0;
9630                                                 } else if (fwd->auth_keyid != auth_keyid) {
9631                                                         /*
9632                                                          * different keyid,
9633                                                          * so done bundling
9634                                                          */
9635                                                         break;
9636                                                 }
9637                                         }
9638                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9639                                         if (m == NULL) {
9640                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9641                                                 return (ENOMEM);
9642                                         }
9643                                         /* Do clear IP_DF ? */
9644                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9645                                                 no_fragmentflg = 0;
9646                                         }
9647                                         /* upate our MTU size */
9648                                         if (mtu > (fwd->send_size + dmtu))
9649                                                 mtu -= (fwd->send_size + dmtu);
9650                                         else
9651                                                 mtu = 0;
9652                                         data_list[bundle_at++] = fwd;
9653                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9654                                                 break;
9655                                         }
9656                                 } else {
9657                                         /* can't fit so we are done */
9658                                         break;
9659                                 }
9660                         }
9661                 }
9662                 /* Is there something to send for this destination? */
9663                 if (m) {
9664                         /*
9665                          * No matter if we fail/or suceed we should start a
9666                          * timer. A failure is like a lost IP packet :-)
9667                          */
9668                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9669                                 /*
9670                                  * no timer running on this destination
9671                                  * restart it.
9672                                  */
9673                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9674                                 tmr_started = 1;
9675                         }
9676                         /* Now lets send it, if there is anything to send :> */
9677                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9678                             (struct sockaddr *)&net->ro._l_addr, m,
9679                             auth_offset, auth, auth_keyid,
9680                             no_fragmentflg, 0, 0,
9681                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9682                             net->port, NULL,
9683                             0, 0,
9684                             so_locked))) {
9685                                 /* error, we could not output */
9686                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9687                                 return (error);
9688                         }
9689                         endofchain = NULL;
9690                         auth = NULL;
9691                         auth_offset = 0;
9692                         /* For HB's */
9693                         /*
9694                          * We don't want to mark the net->sent time here
9695                          * since this we use this for HB and retrans cannot
9696                          * measure RTT
9697                          */
9698                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9699
9700                         /* For auto-close */
9701                         cnt_thru++;
9702                         if (*now_filled == 0) {
9703                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9704                                 *now = asoc->time_last_sent;
9705                                 *now_filled = 1;
9706                         } else {
9707                                 asoc->time_last_sent = *now;
9708                         }
9709                         *cnt_out += bundle_at;
9710 #ifdef SCTP_AUDITING_ENABLED
9711                         sctp_audit_log(0xC4, bundle_at);
9712 #endif
9713                         if (bundle_at) {
9714                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9715                         }
9716                         for (i = 0; i < bundle_at; i++) {
9717                                 SCTP_STAT_INCR(sctps_sendretransdata);
9718                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9719                                 /*
9720                                  * When we have a revoked data, and we
9721                                  * retransmit it, then we clear the revoked
9722                                  * flag since this flag dictates if we
9723                                  * subtracted from the fs
9724                                  */
9725                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9726                                         /* Deflate the cwnd */
9727                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9728                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9729                                 }
9730                                 data_list[i]->snd_count++;
9731                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9732                                 /* record the time */
9733                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9734                                 if (data_list[i]->book_size_scale) {
9735                                         /*
9736                                          * need to double the book size on
9737                                          * this one
9738                                          */
9739                                         data_list[i]->book_size_scale = 0;
9740                                         /*
9741                                          * Since we double the booksize, we
9742                                          * must also double the output queue
9743                                          * size, since this get shrunk when
9744                                          * we free by this amount.
9745                                          */
9746                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9747                                         data_list[i]->book_size *= 2;
9748
9749
9750                                 } else {
9751                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9752                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9753                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9754                                         }
9755                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9756                                             (uint32_t) (data_list[i]->send_size +
9757                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9758                                 }
9759                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9760                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9761                                             data_list[i]->whoTo->flight_size,
9762                                             data_list[i]->book_size,
9763                                             (uintptr_t) data_list[i]->whoTo,
9764                                             data_list[i]->rec.data.TSN_seq);
9765                                 }
9766                                 sctp_flight_size_increase(data_list[i]);
9767                                 sctp_total_flight_increase(stcb, data_list[i]);
9768                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9769                                         /* SWS sender side engages */
9770                                         asoc->peers_rwnd = 0;
9771                                 }
9772                                 if ((i == 0) &&
9773                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9774                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9775                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9776                                             (tmr_started == 0)) {
9777                                                 /*-
9778                                                  * ok we just fast-retrans'd
9779                                                  * the lowest TSN, i.e the
9780                                                  * first on the list. In
9781                                                  * this case we want to give
9782                                                  * some more time to get a
9783                                                  * SACK back without a
9784                                                  * t3-expiring.
9785                                                  */
9786                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9787                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9788                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9789                                         }
9790                                 }
9791                         }
9792                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9793                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9794                         }
9795 #ifdef SCTP_AUDITING_ENABLED
9796                         sctp_auditing(21, inp, stcb, NULL);
9797 #endif
9798                 } else {
9799                         /* None will fit */
9800                         return (1);
9801                 }
9802                 if (asoc->sent_queue_retran_cnt <= 0) {
9803                         /* all done we have no more to retran */
9804                         asoc->sent_queue_retran_cnt = 0;
9805                         break;
9806                 }
9807                 if (one_chunk) {
9808                         /* No more room in rwnd */
9809                         return (1);
9810                 }
9811                 /* stop the for loop here. we sent out a packet */
9812                 break;
9813         }
9814         return (0);
9815 }
9816
9817 static void
9818 sctp_timer_validation(struct sctp_inpcb *inp,
9819     struct sctp_tcb *stcb,
9820     struct sctp_association *asoc)
9821 {
9822         struct sctp_nets *net;
9823
9824         /* Validate that a timer is running somewhere */
9825         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9826                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9827                         /* Here is a timer */
9828                         return;
9829                 }
9830         }
9831         SCTP_TCB_LOCK_ASSERT(stcb);
9832         /* Gak, we did not have a timer somewhere */
9833         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9834         if (asoc->alternate) {
9835                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9836         } else {
9837                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9838         }
9839         return;
9840 }
9841
9842 void
9843 sctp_chunk_output(struct sctp_inpcb *inp,
9844     struct sctp_tcb *stcb,
9845     int from_where,
9846     int so_locked
9847 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9848     SCTP_UNUSED
9849 #endif
9850 )
9851 {
9852         /*-
9853          * Ok this is the generic chunk service queue. we must do the
9854          * following:
9855          * - See if there are retransmits pending, if so we must
9856          *   do these first.
9857          * - Service the stream queue that is next, moving any
9858          *   message (note I must get a complete message i.e.
9859          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9860          *   TSN's
9861          * - Check to see if the cwnd/rwnd allows any output, if so we
9862          *   go ahead and fomulate and send the low level chunks. Making sure
9863          *   to combine any control in the control chunk queue also.
9864          */
9865         struct sctp_association *asoc;
9866         struct sctp_nets *net;
9867         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9868         unsigned int burst_cnt = 0;
9869         struct timeval now;
9870         int now_filled = 0;
9871         int nagle_on;
9872         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9873         int un_sent = 0;
9874         int fr_done;
9875         unsigned int tot_frs = 0;
9876
9877         asoc = &stcb->asoc;
9878 do_it_again:
9879         /* The Nagle algorithm is only applied when handling a send call. */
9880         stcb->asoc.trigger_reset = 0;
9881         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9882                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9883                         nagle_on = 0;
9884                 } else {
9885                         nagle_on = 1;
9886                 }
9887         } else {
9888                 nagle_on = 0;
9889         }
9890         SCTP_TCB_LOCK_ASSERT(stcb);
9891
9892         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9893
9894         if ((un_sent <= 0) &&
9895             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9896             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9897             (asoc->sent_queue_retran_cnt == 0)) {
9898                 /* Nothing to do unless there is something to be sent left */
9899                 return;
9900         }
9901         /*
9902          * Do we have something to send, data or control AND a sack timer
9903          * running, if so piggy-back the sack.
9904          */
9905         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9906                 sctp_send_sack(stcb, so_locked);
9907                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9908         }
9909         while (asoc->sent_queue_retran_cnt) {
9910                 /*-
9911                  * Ok, it is retransmission time only, we send out only ONE
9912                  * packet with a single call off to the retran code.
9913                  */
9914                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9915                         /*-
9916                          * Special hook for handling cookiess discarded
9917                          * by peer that carried data. Send cookie-ack only
9918                          * and then the next call with get the retran's.
9919                          */
9920                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9921                             from_where,
9922                             &now, &now_filled, frag_point, so_locked);
9923                         return;
9924                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9925                         /* if its not from a HB then do it */
9926                         fr_done = 0;
9927                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9928                         if (fr_done) {
9929                                 tot_frs++;
9930                         }
9931                 } else {
9932                         /*
9933                          * its from any other place, we don't allow retran
9934                          * output (only control)
9935                          */
9936                         ret = 1;
9937                 }
9938                 if (ret > 0) {
9939                         /* Can't send anymore */
9940                         /*-
9941                          * now lets push out control by calling med-level
9942                          * output once. this assures that we WILL send HB's
9943                          * if queued too.
9944                          */
9945                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9946                             from_where,
9947                             &now, &now_filled, frag_point, so_locked);
9948 #ifdef SCTP_AUDITING_ENABLED
9949                         sctp_auditing(8, inp, stcb, NULL);
9950 #endif
9951                         sctp_timer_validation(inp, stcb, asoc);
9952                         return;
9953                 }
9954                 if (ret < 0) {
9955                         /*-
9956                          * The count was off.. retran is not happening so do
9957                          * the normal retransmission.
9958                          */
9959 #ifdef SCTP_AUDITING_ENABLED
9960                         sctp_auditing(9, inp, stcb, NULL);
9961 #endif
9962                         if (ret == SCTP_RETRAN_EXIT) {
9963                                 return;
9964                         }
9965                         break;
9966                 }
9967                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9968                         /* Only one transmission allowed out of a timeout */
9969 #ifdef SCTP_AUDITING_ENABLED
9970                         sctp_auditing(10, inp, stcb, NULL);
9971 #endif
9972                         /* Push out any control */
9973                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9974                             &now, &now_filled, frag_point, so_locked);
9975                         return;
9976                 }
9977                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9978                         /* Hit FR burst limit */
9979                         return;
9980                 }
9981                 if ((num_out == 0) && (ret == 0)) {
9982                         /* No more retrans to send */
9983                         break;
9984                 }
9985         }
9986 #ifdef SCTP_AUDITING_ENABLED
9987         sctp_auditing(12, inp, stcb, NULL);
9988 #endif
9989         /* Check for bad destinations, if they exist move chunks around. */
9990         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9991                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9992                         /*-
9993                          * if possible move things off of this address we
9994                          * still may send below due to the dormant state but
9995                          * we try to find an alternate address to send to
9996                          * and if we have one we move all queued data on the
9997                          * out wheel to this alternate address.
9998                          */
9999                         if (net->ref_count > 1)
10000                                 sctp_move_chunks_from_net(stcb, net);
10001                 } else {
10002                         /*-
10003                          * if ((asoc->sat_network) || (net->addr_is_local))
10004                          * { burst_limit = asoc->max_burst *
10005                          * SCTP_SAT_NETWORK_BURST_INCR; }
10006                          */
10007                         if (asoc->max_burst > 0) {
10008                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10009                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10010                                                 /*
10011                                                  * JRS - Use the congestion
10012                                                  * control given in the
10013                                                  * congestion control module
10014                                                  */
10015                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10016                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10017                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10018                                                 }
10019                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10020                                         }
10021                                         net->fast_retran_ip = 0;
10022                                 } else {
10023                                         if (net->flight_size == 0) {
10024                                                 /*
10025                                                  * Should be decaying the
10026                                                  * cwnd here
10027                                                  */
10028                                                 ;
10029                                         }
10030                                 }
10031                         }
10032                 }
10033
10034         }
10035         burst_cnt = 0;
10036         do {
10037                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10038                     &reason_code, 0, from_where,
10039                     &now, &now_filled, frag_point, so_locked);
10040                 if (error) {
10041                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10042                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10043                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10044                         }
10045                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10046                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10047                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10048                         }
10049                         break;
10050                 }
10051                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10052
10053                 tot_out += num_out;
10054                 burst_cnt++;
10055                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10056                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10057                         if (num_out == 0) {
10058                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10059                         }
10060                 }
10061                 if (nagle_on) {
10062                         /*
10063                          * When the Nagle algorithm is used, look at how
10064                          * much is unsent, then if its smaller than an MTU
10065                          * and we have data in flight we stop, except if we
10066                          * are handling a fragmented user message.
10067                          */
10068                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10069                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10070                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10071                             (stcb->asoc.total_flight > 0) &&
10072                             ((stcb->asoc.locked_on_sending == NULL) ||
10073                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10074                                 break;
10075                         }
10076                 }
10077                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10078                     TAILQ_EMPTY(&asoc->send_queue) &&
10079                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10080                         /* Nothing left to send */
10081                         break;
10082                 }
10083                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10084                         /* Nothing left to send */
10085                         break;
10086                 }
10087         } while (num_out &&
10088             ((asoc->max_burst == 0) ||
10089             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10090             (burst_cnt < asoc->max_burst)));
10091
10092         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10093                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10094                         SCTP_STAT_INCR(sctps_maxburstqueued);
10095                         asoc->burst_limit_applied = 1;
10096                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10097                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10098                         }
10099                 } else {
10100                         asoc->burst_limit_applied = 0;
10101                 }
10102         }
10103         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10104                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10105         }
10106         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10107             tot_out);
10108
10109         /*-
10110          * Now we need to clean up the control chunk chain if a ECNE is on
10111          * it. It must be marked as UNSENT again so next call will continue
10112          * to send it until such time that we get a CWR, to remove it.
10113          */
10114         if (stcb->asoc.ecn_echo_cnt_onq)
10115                 sctp_fix_ecn_echo(asoc);
10116
10117         if (stcb->asoc.trigger_reset) {
10118                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10119                         goto do_it_again;
10120                 }
10121         }
10122         return;
10123 }
10124
10125
10126 int
10127 sctp_output(
10128     struct sctp_inpcb *inp,
10129     struct mbuf *m,
10130     struct sockaddr *addr,
10131     struct mbuf *control,
10132     struct thread *p,
10133     int flags)
10134 {
10135         if (inp == NULL) {
10136                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10137                 return (EINVAL);
10138         }
10139         if (inp->sctp_socket == NULL) {
10140                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10141                 return (EINVAL);
10142         }
10143         return (sctp_sosend(inp->sctp_socket,
10144             addr,
10145             (struct uio *)NULL,
10146             m,
10147             control,
10148             flags, p
10149             ));
10150 }
10151
10152 void
10153 send_forward_tsn(struct sctp_tcb *stcb,
10154     struct sctp_association *asoc)
10155 {
10156         struct sctp_tmit_chunk *chk;
10157         struct sctp_forward_tsn_chunk *fwdtsn;
10158         uint32_t advance_peer_ack_point;
10159
10160         SCTP_TCB_LOCK_ASSERT(stcb);
10161         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10162                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10163                         /* mark it to unsent */
10164                         chk->sent = SCTP_DATAGRAM_UNSENT;
10165                         chk->snd_count = 0;
10166                         /* Do we correct its output location? */
10167                         if (chk->whoTo) {
10168                                 sctp_free_remote_addr(chk->whoTo);
10169                                 chk->whoTo = NULL;
10170                         }
10171                         goto sctp_fill_in_rest;
10172                 }
10173         }
10174         /* Ok if we reach here we must build one */
10175         sctp_alloc_a_chunk(stcb, chk);
10176         if (chk == NULL) {
10177                 return;
10178         }
10179         asoc->fwd_tsn_cnt++;
10180         chk->copy_by_ref = 0;
10181         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10182         chk->rec.chunk_id.can_take_data = 0;
10183         chk->flags = 0;
10184         chk->asoc = asoc;
10185         chk->whoTo = NULL;
10186         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10187         if (chk->data == NULL) {
10188                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10189                 return;
10190         }
10191         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10192         chk->sent = SCTP_DATAGRAM_UNSENT;
10193         chk->snd_count = 0;
10194         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10195         asoc->ctrl_queue_cnt++;
10196 sctp_fill_in_rest:
10197         /*-
10198          * Here we go through and fill out the part that deals with
10199          * stream/seq of the ones we skip.
10200          */
10201         SCTP_BUF_LEN(chk->data) = 0;
10202         {
10203                 struct sctp_tmit_chunk *at, *tp1, *last;
10204                 struct sctp_strseq *strseq;
10205                 unsigned int cnt_of_space, i, ovh;
10206                 unsigned int space_needed;
10207                 unsigned int cnt_of_skipped = 0;
10208
10209                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10210                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10211                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10212                                 /* no more to look at */
10213                                 break;
10214                         }
10215                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10216                                 /* We don't report these */
10217                                 continue;
10218                         }
10219                         cnt_of_skipped++;
10220                 }
10221                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10222                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10223
10224                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10225
10226                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10227                         ovh = SCTP_MIN_OVERHEAD;
10228                 } else {
10229                         ovh = SCTP_MIN_V4_OVERHEAD;
10230                 }
10231                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10232                         /* trim to a mtu size */
10233                         cnt_of_space = asoc->smallest_mtu - ovh;
10234                 }
10235                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10236                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10237                             0xff, 0, cnt_of_skipped,
10238                             asoc->advanced_peer_ack_point);
10239
10240                 }
10241                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10242                 if (cnt_of_space < space_needed) {
10243                         /*-
10244                          * ok we must trim down the chunk by lowering the
10245                          * advance peer ack point.
10246                          */
10247                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10248                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10249                                     0xff, 0xff, cnt_of_space,
10250                                     space_needed);
10251                         }
10252                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10253                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10254                         /*-
10255                          * Go through and find the TSN that will be the one
10256                          * we report.
10257                          */
10258                         at = TAILQ_FIRST(&asoc->sent_queue);
10259                         if (at != NULL) {
10260                                 for (i = 0; i < cnt_of_skipped; i++) {
10261                                         tp1 = TAILQ_NEXT(at, sctp_next);
10262                                         if (tp1 == NULL) {
10263                                                 break;
10264                                         }
10265                                         at = tp1;
10266                                 }
10267                         }
10268                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10269                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10270                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10271                                     asoc->advanced_peer_ack_point);
10272                         }
10273                         last = at;
10274                         /*-
10275                          * last now points to last one I can report, update
10276                          * peer ack point
10277                          */
10278                         if (last)
10279                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10280                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10281                             cnt_of_skipped * sizeof(struct sctp_strseq);
10282                 }
10283                 chk->send_size = space_needed;
10284                 /* Setup the chunk */
10285                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10286                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10287                 fwdtsn->ch.chunk_flags = 0;
10288                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10289                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10290                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10291                 fwdtsn++;
10292                 /*-
10293                  * Move pointer to after the fwdtsn and transfer to the
10294                  * strseq pointer.
10295                  */
10296                 strseq = (struct sctp_strseq *)fwdtsn;
10297                 /*-
10298                  * Now populate the strseq list. This is done blindly
10299                  * without pulling out duplicate stream info. This is
10300                  * inefficent but won't harm the process since the peer will
10301                  * look at these in sequence and will thus release anything.
10302                  * It could mean we exceed the PMTU and chop off some that
10303                  * we could have included.. but this is unlikely (aka 1432/4
10304                  * would mean 300+ stream seq's would have to be reported in
10305                  * one FWD-TSN. With a bit of work we can later FIX this to
10306                  * optimize and pull out duplcates.. but it does add more
10307                  * overhead. So for now... not!
10308                  */
10309                 at = TAILQ_FIRST(&asoc->sent_queue);
10310                 for (i = 0; i < cnt_of_skipped; i++) {
10311                         tp1 = TAILQ_NEXT(at, sctp_next);
10312                         if (tp1 == NULL)
10313                                 break;
10314                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10315                                 /* We don't report these */
10316                                 i--;
10317                                 at = tp1;
10318                                 continue;
10319                         }
10320                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10321                                 at->rec.data.fwd_tsn_cnt = 0;
10322                         }
10323                         strseq->stream = ntohs(at->rec.data.stream_number);
10324                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10325                         strseq++;
10326                         at = tp1;
10327                 }
10328         }
10329         return;
10330 }
10331
10332 void
10333 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10334 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10335     SCTP_UNUSED
10336 #endif
10337 )
10338 {
10339         /*-
10340          * Queue up a SACK or NR-SACK in the control queue.
10341          * We must first check to see if a SACK or NR-SACK is
10342          * somehow on the control queue.
10343          * If so, we will take and and remove the old one.
10344          */
10345         struct sctp_association *asoc;
10346         struct sctp_tmit_chunk *chk, *a_chk;
10347         struct sctp_sack_chunk *sack;
10348         struct sctp_nr_sack_chunk *nr_sack;
10349         struct sctp_gap_ack_block *gap_descriptor;
10350         struct sack_track *selector;
10351         int mergeable = 0;
10352         int offset;
10353         caddr_t limit;
10354         uint32_t *dup;
10355         int limit_reached = 0;
10356         unsigned int i, siz, j;
10357         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10358         int num_dups = 0;
10359         int space_req;
10360         uint32_t highest_tsn;
10361         uint8_t flags;
10362         uint8_t type;
10363         uint8_t tsn_map;
10364
10365         if (stcb->asoc.nrsack_supported == 1) {
10366                 type = SCTP_NR_SELECTIVE_ACK;
10367         } else {
10368                 type = SCTP_SELECTIVE_ACK;
10369         }
10370         a_chk = NULL;
10371         asoc = &stcb->asoc;
10372         SCTP_TCB_LOCK_ASSERT(stcb);
10373         if (asoc->last_data_chunk_from == NULL) {
10374                 /* Hmm we never received anything */
10375                 return;
10376         }
10377         sctp_slide_mapping_arrays(stcb);
10378         sctp_set_rwnd(stcb, asoc);
10379         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10380                 if (chk->rec.chunk_id.id == type) {
10381                         /* Hmm, found a sack already on queue, remove it */
10382                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10383                         asoc->ctrl_queue_cnt--;
10384                         a_chk = chk;
10385                         if (a_chk->data) {
10386                                 sctp_m_freem(a_chk->data);
10387                                 a_chk->data = NULL;
10388                         }
10389                         if (a_chk->whoTo) {
10390                                 sctp_free_remote_addr(a_chk->whoTo);
10391                                 a_chk->whoTo = NULL;
10392                         }
10393                         break;
10394                 }
10395         }
10396         if (a_chk == NULL) {
10397                 sctp_alloc_a_chunk(stcb, a_chk);
10398                 if (a_chk == NULL) {
10399                         /* No memory so we drop the idea, and set a timer */
10400                         if (stcb->asoc.delayed_ack) {
10401                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10402                                     stcb->sctp_ep, stcb, NULL,
10403                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10404                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10405                                     stcb->sctp_ep, stcb, NULL);
10406                         } else {
10407                                 stcb->asoc.send_sack = 1;
10408                         }
10409                         return;
10410                 }
10411                 a_chk->copy_by_ref = 0;
10412                 a_chk->rec.chunk_id.id = type;
10413                 a_chk->rec.chunk_id.can_take_data = 1;
10414         }
10415         /* Clear our pkt counts */
10416         asoc->data_pkts_seen = 0;
10417
10418         a_chk->flags = 0;
10419         a_chk->asoc = asoc;
10420         a_chk->snd_count = 0;
10421         a_chk->send_size = 0;   /* fill in later */
10422         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10423         a_chk->whoTo = NULL;
10424
10425         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10426                 /*-
10427                  * Ok, the destination for the SACK is unreachable, lets see if
10428                  * we can select an alternate to asoc->last_data_chunk_from
10429                  */
10430                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10431                 if (a_chk->whoTo == NULL) {
10432                         /* Nope, no alternate */
10433                         a_chk->whoTo = asoc->last_data_chunk_from;
10434                 }
10435         } else {
10436                 a_chk->whoTo = asoc->last_data_chunk_from;
10437         }
10438         if (a_chk->whoTo) {
10439                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10440         }
10441         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10442                 highest_tsn = asoc->highest_tsn_inside_map;
10443         } else {
10444                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10445         }
10446         if (highest_tsn == asoc->cumulative_tsn) {
10447                 /* no gaps */
10448                 if (type == SCTP_SELECTIVE_ACK) {
10449                         space_req = sizeof(struct sctp_sack_chunk);
10450                 } else {
10451                         space_req = sizeof(struct sctp_nr_sack_chunk);
10452                 }
10453         } else {
10454                 /* gaps get a cluster */
10455                 space_req = MCLBYTES;
10456         }
10457         /* Ok now lets formulate a MBUF with our sack */
10458         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10459         if ((a_chk->data == NULL) ||
10460             (a_chk->whoTo == NULL)) {
10461                 /* rats, no mbuf memory */
10462                 if (a_chk->data) {
10463                         /* was a problem with the destination */
10464                         sctp_m_freem(a_chk->data);
10465                         a_chk->data = NULL;
10466                 }
10467                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10468                 /* sa_ignore NO_NULL_CHK */
10469                 if (stcb->asoc.delayed_ack) {
10470                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10471                             stcb->sctp_ep, stcb, NULL,
10472                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10473                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10474                             stcb->sctp_ep, stcb, NULL);
10475                 } else {
10476                         stcb->asoc.send_sack = 1;
10477                 }
10478                 return;
10479         }
10480         /* ok, lets go through and fill it in */
10481         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10482         space = M_TRAILINGSPACE(a_chk->data);
10483         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10484                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10485         }
10486         limit = mtod(a_chk->data, caddr_t);
10487         limit += space;
10488
10489         flags = 0;
10490
10491         if ((asoc->sctp_cmt_on_off > 0) &&
10492             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10493                 /*-
10494                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10495                  * received, then set high bit to 1, else 0. Reset
10496                  * pkts_rcvd.
10497                  */
10498                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10499                 asoc->cmt_dac_pkts_rcvd = 0;
10500         }
10501 #ifdef SCTP_ASOCLOG_OF_TSNS
10502         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10503         stcb->asoc.cumack_log_atsnt++;
10504         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10505                 stcb->asoc.cumack_log_atsnt = 0;
10506         }
10507 #endif
10508         /* reset the readers interpretation */
10509         stcb->freed_by_sorcv_sincelast = 0;
10510
10511         if (type == SCTP_SELECTIVE_ACK) {
10512                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10513                 nr_sack = NULL;
10514                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10515                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10516                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10517                 } else {
10518                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10519                 }
10520         } else {
10521                 sack = NULL;
10522                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10523                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10524                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10525                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10526                 } else {
10527                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10528                 }
10529         }
10530
10531         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10532                 offset = 1;
10533         } else {
10534                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10535         }
10536         if (((type == SCTP_SELECTIVE_ACK) &&
10537             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10538             ((type == SCTP_NR_SELECTIVE_ACK) &&
10539             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10540                 /* we have a gap .. maybe */
10541                 for (i = 0; i < siz; i++) {
10542                         tsn_map = asoc->mapping_array[i];
10543                         if (type == SCTP_SELECTIVE_ACK) {
10544                                 tsn_map |= asoc->nr_mapping_array[i];
10545                         }
10546                         if (i == 0) {
10547                                 /*
10548                                  * Clear all bits corresponding to TSNs
10549                                  * smaller or equal to the cumulative TSN.
10550                                  */
10551                                 tsn_map &= (~0 << (1 - offset));
10552                         }
10553                         selector = &sack_array[tsn_map];
10554                         if (mergeable && selector->right_edge) {
10555                                 /*
10556                                  * Backup, left and right edges were ok to
10557                                  * merge.
10558                                  */
10559                                 num_gap_blocks--;
10560                                 gap_descriptor--;
10561                         }
10562                         if (selector->num_entries == 0)
10563                                 mergeable = 0;
10564                         else {
10565                                 for (j = 0; j < selector->num_entries; j++) {
10566                                         if (mergeable && selector->right_edge) {
10567                                                 /*
10568                                                  * do a merge by NOT setting
10569                                                  * the left side
10570                                                  */
10571                                                 mergeable = 0;
10572                                         } else {
10573                                                 /*
10574                                                  * no merge, set the left
10575                                                  * side
10576                                                  */
10577                                                 mergeable = 0;
10578                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10579                                         }
10580                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10581                                         num_gap_blocks++;
10582                                         gap_descriptor++;
10583                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10584                                                 /* no more room */
10585                                                 limit_reached = 1;
10586                                                 break;
10587                                         }
10588                                 }
10589                                 if (selector->left_edge) {
10590                                         mergeable = 1;
10591                                 }
10592                         }
10593                         if (limit_reached) {
10594                                 /* Reached the limit stop */
10595                                 break;
10596                         }
10597                         offset += 8;
10598                 }
10599         }
10600         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10601             (limit_reached == 0)) {
10602
10603                 mergeable = 0;
10604
10605                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10606                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10607                 } else {
10608                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10609                 }
10610
10611                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10612                         offset = 1;
10613                 } else {
10614                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10615                 }
10616                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10617                         /* we have a gap .. maybe */
10618                         for (i = 0; i < siz; i++) {
10619                                 tsn_map = asoc->nr_mapping_array[i];
10620                                 if (i == 0) {
10621                                         /*
10622                                          * Clear all bits corresponding to
10623                                          * TSNs smaller or equal to the
10624                                          * cumulative TSN.
10625                                          */
10626                                         tsn_map &= (~0 << (1 - offset));
10627                                 }
10628                                 selector = &sack_array[tsn_map];
10629                                 if (mergeable && selector->right_edge) {
10630                                         /*
10631                                          * Backup, left and right edges were
10632                                          * ok to merge.
10633                                          */
10634                                         num_nr_gap_blocks--;
10635                                         gap_descriptor--;
10636                                 }
10637                                 if (selector->num_entries == 0)
10638                                         mergeable = 0;
10639                                 else {
10640                                         for (j = 0; j < selector->num_entries; j++) {
10641                                                 if (mergeable && selector->right_edge) {
10642                                                         /*
10643                                                          * do a merge by NOT
10644                                                          * setting the left
10645                                                          * side
10646                                                          */
10647                                                         mergeable = 0;
10648                                                 } else {
10649                                                         /*
10650                                                          * no merge, set the
10651                                                          * left side
10652                                                          */
10653                                                         mergeable = 0;
10654                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10655                                                 }
10656                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10657                                                 num_nr_gap_blocks++;
10658                                                 gap_descriptor++;
10659                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10660                                                         /* no more room */
10661                                                         limit_reached = 1;
10662                                                         break;
10663                                                 }
10664                                         }
10665                                         if (selector->left_edge) {
10666                                                 mergeable = 1;
10667                                         }
10668                                 }
10669                                 if (limit_reached) {
10670                                         /* Reached the limit stop */
10671                                         break;
10672                                 }
10673                                 offset += 8;
10674                         }
10675                 }
10676         }
10677         /* now we must add any dups we are going to report. */
10678         if ((limit_reached == 0) && (asoc->numduptsns)) {
10679                 dup = (uint32_t *) gap_descriptor;
10680                 for (i = 0; i < asoc->numduptsns; i++) {
10681                         *dup = htonl(asoc->dup_tsns[i]);
10682                         dup++;
10683                         num_dups++;
10684                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10685                                 /* no more room */
10686                                 break;
10687                         }
10688                 }
10689                 asoc->numduptsns = 0;
10690         }
10691         /*
10692          * now that the chunk is prepared queue it to the control chunk
10693          * queue.
10694          */
10695         if (type == SCTP_SELECTIVE_ACK) {
10696                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10697                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10698                     num_dups * sizeof(int32_t);
10699                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10700                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10701                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10702                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10703                 sack->sack.num_dup_tsns = htons(num_dups);
10704                 sack->ch.chunk_type = type;
10705                 sack->ch.chunk_flags = flags;
10706                 sack->ch.chunk_length = htons(a_chk->send_size);
10707         } else {
10708                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10709                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10710                     num_dups * sizeof(int32_t);
10711                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10712                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10713                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10714                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10715                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10716                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10717                 nr_sack->nr_sack.reserved = 0;
10718                 nr_sack->ch.chunk_type = type;
10719                 nr_sack->ch.chunk_flags = flags;
10720                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10721         }
10722         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10723         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10724         asoc->ctrl_queue_cnt++;
10725         asoc->send_sack = 0;
10726         SCTP_STAT_INCR(sctps_sendsacks);
10727         return;
10728 }
10729
10730 void
10731 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10732 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10733     SCTP_UNUSED
10734 #endif
10735 )
10736 {
10737         struct mbuf *m_abort, *m, *m_last;
10738         struct mbuf *m_out, *m_end = NULL;
10739         struct sctp_abort_chunk *abort;
10740         struct sctp_auth_chunk *auth = NULL;
10741         struct sctp_nets *net;
10742         uint32_t vtag;
10743         uint32_t auth_offset = 0;
10744         uint16_t cause_len, chunk_len, padding_len;
10745
10746         SCTP_TCB_LOCK_ASSERT(stcb);
10747         /*-
10748          * Add an AUTH chunk, if chunk requires it and save the offset into
10749          * the chain for AUTH
10750          */
10751         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10752             stcb->asoc.peer_auth_chunks)) {
10753                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10754                     stcb, SCTP_ABORT_ASSOCIATION);
10755                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10756         } else {
10757                 m_out = NULL;
10758         }
10759         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10760         if (m_abort == NULL) {
10761                 if (m_out) {
10762                         sctp_m_freem(m_out);
10763                 }
10764                 if (operr) {
10765                         sctp_m_freem(operr);
10766                 }
10767                 return;
10768         }
10769         /* link in any error */
10770         SCTP_BUF_NEXT(m_abort) = operr;
10771         cause_len = 0;
10772         m_last = NULL;
10773         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10774                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10775                 if (SCTP_BUF_NEXT(m) == NULL) {
10776                         m_last = m;
10777                 }
10778         }
10779         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10780         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10781         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10782         if (m_out == NULL) {
10783                 /* NO Auth chunk prepended, so reserve space in front */
10784                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10785                 m_out = m_abort;
10786         } else {
10787                 /* Put AUTH chunk at the front of the chain */
10788                 SCTP_BUF_NEXT(m_end) = m_abort;
10789         }
10790         if (stcb->asoc.alternate) {
10791                 net = stcb->asoc.alternate;
10792         } else {
10793                 net = stcb->asoc.primary_destination;
10794         }
10795         /* Fill in the ABORT chunk header. */
10796         abort = mtod(m_abort, struct sctp_abort_chunk *);
10797         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10798         if (stcb->asoc.peer_vtag == 0) {
10799                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10800                 vtag = stcb->asoc.my_vtag;
10801                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10802         } else {
10803                 vtag = stcb->asoc.peer_vtag;
10804                 abort->ch.chunk_flags = 0;
10805         }
10806         abort->ch.chunk_length = htons(chunk_len);
10807         /* Add padding, if necessary. */
10808         if (padding_len > 0) {
10809                 if ((m_last == NULL) ||
10810                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10811                         sctp_m_freem(m_out);
10812                         return;
10813                 }
10814         }
10815         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10816             (struct sockaddr *)&net->ro._l_addr,
10817             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10818             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10819             stcb->asoc.primary_destination->port, NULL,
10820             0, 0,
10821             so_locked);
10822         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10823 }
10824
10825 void
10826 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10827     struct sctp_nets *net,
10828     int reflect_vtag)
10829 {
10830         /* formulate and SEND a SHUTDOWN-COMPLETE */
10831         struct mbuf *m_shutdown_comp;
10832         struct sctp_shutdown_complete_chunk *shutdown_complete;
10833         uint32_t vtag;
10834         uint8_t flags;
10835
10836         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10837         if (m_shutdown_comp == NULL) {
10838                 /* no mbuf's */
10839                 return;
10840         }
10841         if (reflect_vtag) {
10842                 flags = SCTP_HAD_NO_TCB;
10843                 vtag = stcb->asoc.my_vtag;
10844         } else {
10845                 flags = 0;
10846                 vtag = stcb->asoc.peer_vtag;
10847         }
10848         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10849         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10850         shutdown_complete->ch.chunk_flags = flags;
10851         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10852         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10853         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10854             (struct sockaddr *)&net->ro._l_addr,
10855             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10856             stcb->sctp_ep->sctp_lport, stcb->rport,
10857             htonl(vtag),
10858             net->port, NULL,
10859             0, 0,
10860             SCTP_SO_NOT_LOCKED);
10861         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10862         return;
10863 }
10864
10865 static void
10866 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10867     struct sctphdr *sh, uint32_t vtag,
10868     uint8_t type, struct mbuf *cause,
10869     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10870     uint32_t vrf_id, uint16_t port)
10871 {
10872         struct mbuf *o_pak;
10873         struct mbuf *mout;
10874         struct sctphdr *shout;
10875         struct sctp_chunkhdr *ch;
10876
10877 #if defined(INET) || defined(INET6)
10878         struct udphdr *udp;
10879         int ret;
10880
10881 #endif
10882         int len, cause_len, padding_len;
10883
10884 #ifdef INET
10885         struct sockaddr_in *src_sin, *dst_sin;
10886         struct ip *ip;
10887
10888 #endif
10889 #ifdef INET6
10890         struct sockaddr_in6 *src_sin6, *dst_sin6;
10891         struct ip6_hdr *ip6;
10892
10893 #endif
10894
10895         /* Compute the length of the cause and add final padding. */
10896         cause_len = 0;
10897         if (cause != NULL) {
10898                 struct mbuf *m_at, *m_last = NULL;
10899
10900                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10901                         if (SCTP_BUF_NEXT(m_at) == NULL)
10902                                 m_last = m_at;
10903                         cause_len += SCTP_BUF_LEN(m_at);
10904                 }
10905                 padding_len = cause_len % 4;
10906                 if (padding_len != 0) {
10907                         padding_len = 4 - padding_len;
10908                 }
10909                 if (padding_len != 0) {
10910                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10911                                 sctp_m_freem(cause);
10912                                 return;
10913                         }
10914                 }
10915         } else {
10916                 padding_len = 0;
10917         }
10918         /* Get an mbuf for the header. */
10919         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10920         switch (dst->sa_family) {
10921 #ifdef INET
10922         case AF_INET:
10923                 len += sizeof(struct ip);
10924                 break;
10925 #endif
10926 #ifdef INET6
10927         case AF_INET6:
10928                 len += sizeof(struct ip6_hdr);
10929                 break;
10930 #endif
10931         default:
10932                 break;
10933         }
10934 #if defined(INET) || defined(INET6)
10935         if (port) {
10936                 len += sizeof(struct udphdr);
10937         }
10938 #endif
10939         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
10940         if (mout == NULL) {
10941                 if (cause) {
10942                         sctp_m_freem(cause);
10943                 }
10944                 return;
10945         }
10946         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10947         SCTP_BUF_LEN(mout) = len;
10948         SCTP_BUF_NEXT(mout) = cause;
10949         M_SETFIB(mout, fibnum);
10950         mout->m_pkthdr.flowid = mflowid;
10951         M_HASHTYPE_SET(mout, mflowtype);
10952 #ifdef INET
10953         ip = NULL;
10954 #endif
10955 #ifdef INET6
10956         ip6 = NULL;
10957 #endif
10958         switch (dst->sa_family) {
10959 #ifdef INET
10960         case AF_INET:
10961                 src_sin = (struct sockaddr_in *)src;
10962                 dst_sin = (struct sockaddr_in *)dst;
10963                 ip = mtod(mout, struct ip *);
10964                 ip->ip_v = IPVERSION;
10965                 ip->ip_hl = (sizeof(struct ip) >> 2);
10966                 ip->ip_tos = 0;
10967                 ip->ip_off = 0;
10968                 ip_fillid(ip);
10969                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10970                 if (port) {
10971                         ip->ip_p = IPPROTO_UDP;
10972                 } else {
10973                         ip->ip_p = IPPROTO_SCTP;
10974                 }
10975                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10976                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10977                 ip->ip_sum = 0;
10978                 len = sizeof(struct ip);
10979                 shout = (struct sctphdr *)((caddr_t)ip + len);
10980                 break;
10981 #endif
10982 #ifdef INET6
10983         case AF_INET6:
10984                 src_sin6 = (struct sockaddr_in6 *)src;
10985                 dst_sin6 = (struct sockaddr_in6 *)dst;
10986                 ip6 = mtod(mout, struct ip6_hdr *);
10987                 ip6->ip6_flow = htonl(0x60000000);
10988                 if (V_ip6_auto_flowlabel) {
10989                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10990                 }
10991                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10992                 if (port) {
10993                         ip6->ip6_nxt = IPPROTO_UDP;
10994                 } else {
10995                         ip6->ip6_nxt = IPPROTO_SCTP;
10996                 }
10997                 ip6->ip6_src = dst_sin6->sin6_addr;
10998                 ip6->ip6_dst = src_sin6->sin6_addr;
10999                 len = sizeof(struct ip6_hdr);
11000                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11001                 break;
11002 #endif
11003         default:
11004                 len = 0;
11005                 shout = mtod(mout, struct sctphdr *);
11006                 break;
11007         }
11008 #if defined(INET) || defined(INET6)
11009         if (port) {
11010                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11011                         sctp_m_freem(mout);
11012                         return;
11013                 }
11014                 udp = (struct udphdr *)shout;
11015                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11016                 udp->uh_dport = port;
11017                 udp->uh_sum = 0;
11018                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11019                     sizeof(struct sctphdr) +
11020                     sizeof(struct sctp_chunkhdr) +
11021                     cause_len + padding_len);
11022                 len += sizeof(struct udphdr);
11023                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11024         } else {
11025                 udp = NULL;
11026         }
11027 #endif
11028         shout->src_port = sh->dest_port;
11029         shout->dest_port = sh->src_port;
11030         shout->checksum = 0;
11031         if (vtag) {
11032                 shout->v_tag = htonl(vtag);
11033         } else {
11034                 shout->v_tag = sh->v_tag;
11035         }
11036         len += sizeof(struct sctphdr);
11037         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11038         ch->chunk_type = type;
11039         if (vtag) {
11040                 ch->chunk_flags = 0;
11041         } else {
11042                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11043         }
11044         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11045         len += sizeof(struct sctp_chunkhdr);
11046         len += cause_len + padding_len;
11047
11048         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11049                 sctp_m_freem(mout);
11050                 return;
11051         }
11052         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11053         switch (dst->sa_family) {
11054 #ifdef INET
11055         case AF_INET:
11056                 if (port) {
11057                         if (V_udp_cksum) {
11058                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11059                         } else {
11060                                 udp->uh_sum = 0;
11061                         }
11062                 }
11063                 ip->ip_len = htons(len);
11064                 if (port) {
11065 #if defined(SCTP_WITH_NO_CSUM)
11066                         SCTP_STAT_INCR(sctps_sendnocrc);
11067 #else
11068                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11069                         SCTP_STAT_INCR(sctps_sendswcrc);
11070 #endif
11071                         if (V_udp_cksum) {
11072                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11073                         }
11074                 } else {
11075 #if defined(SCTP_WITH_NO_CSUM)
11076                         SCTP_STAT_INCR(sctps_sendnocrc);
11077 #else
11078                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11079                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11080                         SCTP_STAT_INCR(sctps_sendhwcrc);
11081 #endif
11082                 }
11083 #ifdef SCTP_PACKET_LOGGING
11084                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11085                         sctp_packet_log(o_pak);
11086                 }
11087 #endif
11088                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11089                 break;
11090 #endif
11091 #ifdef INET6
11092         case AF_INET6:
11093                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11094                 if (port) {
11095 #if defined(SCTP_WITH_NO_CSUM)
11096                         SCTP_STAT_INCR(sctps_sendnocrc);
11097 #else
11098                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11099                         SCTP_STAT_INCR(sctps_sendswcrc);
11100 #endif
11101                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11102                                 udp->uh_sum = 0xffff;
11103                         }
11104                 } else {
11105 #if defined(SCTP_WITH_NO_CSUM)
11106                         SCTP_STAT_INCR(sctps_sendnocrc);
11107 #else
11108                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11109                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11110                         SCTP_STAT_INCR(sctps_sendhwcrc);
11111 #endif
11112                 }
11113 #ifdef SCTP_PACKET_LOGGING
11114                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11115                         sctp_packet_log(o_pak);
11116                 }
11117 #endif
11118                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11119                 break;
11120 #endif
11121         default:
11122                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11123                     dst->sa_family);
11124                 sctp_m_freem(mout);
11125                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11126                 return;
11127         }
11128         SCTP_STAT_INCR(sctps_sendpackets);
11129         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11130         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11131         return;
11132 }
11133
11134 void
11135 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11136     struct sctphdr *sh,
11137     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11138     uint32_t vrf_id, uint16_t port)
11139 {
11140         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11141             mflowtype, mflowid, fibnum,
11142             vrf_id, port);
11143 }
11144
11145 void
11146 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11147 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11148     SCTP_UNUSED
11149 #endif
11150 )
11151 {
11152         struct sctp_tmit_chunk *chk;
11153         struct sctp_heartbeat_chunk *hb;
11154         struct timeval now;
11155
11156         SCTP_TCB_LOCK_ASSERT(stcb);
11157         if (net == NULL) {
11158                 return;
11159         }
11160         (void)SCTP_GETTIME_TIMEVAL(&now);
11161         switch (net->ro._l_addr.sa.sa_family) {
11162 #ifdef INET
11163         case AF_INET:
11164                 break;
11165 #endif
11166 #ifdef INET6
11167         case AF_INET6:
11168                 break;
11169 #endif
11170         default:
11171                 return;
11172         }
11173         sctp_alloc_a_chunk(stcb, chk);
11174         if (chk == NULL) {
11175                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11176                 return;
11177         }
11178         chk->copy_by_ref = 0;
11179         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11180         chk->rec.chunk_id.can_take_data = 1;
11181         chk->flags = 0;
11182         chk->asoc = &stcb->asoc;
11183         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11184
11185         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11186         if (chk->data == NULL) {
11187                 sctp_free_a_chunk(stcb, chk, so_locked);
11188                 return;
11189         }
11190         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11191         SCTP_BUF_LEN(chk->data) = chk->send_size;
11192         chk->sent = SCTP_DATAGRAM_UNSENT;
11193         chk->snd_count = 0;
11194         chk->whoTo = net;
11195         atomic_add_int(&chk->whoTo->ref_count, 1);
11196         /* Now we have a mbuf that we can fill in with the details */
11197         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11198         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11199         /* fill out chunk header */
11200         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11201         hb->ch.chunk_flags = 0;
11202         hb->ch.chunk_length = htons(chk->send_size);
11203         /* Fill out hb parameter */
11204         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11205         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11206         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11207         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11208         /* Did our user request this one, put it in */
11209         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11210         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11211         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11212                 /*
11213                  * we only take from the entropy pool if the address is not
11214                  * confirmed.
11215                  */
11216                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11217                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11218         } else {
11219                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11220                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11221         }
11222         switch (net->ro._l_addr.sa.sa_family) {
11223 #ifdef INET
11224         case AF_INET:
11225                 memcpy(hb->heartbeat.hb_info.address,
11226                     &net->ro._l_addr.sin.sin_addr,
11227                     sizeof(net->ro._l_addr.sin.sin_addr));
11228                 break;
11229 #endif
11230 #ifdef INET6
11231         case AF_INET6:
11232                 memcpy(hb->heartbeat.hb_info.address,
11233                     &net->ro._l_addr.sin6.sin6_addr,
11234                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11235                 break;
11236 #endif
11237         default:
11238                 return;
11239                 break;
11240         }
11241         net->hb_responded = 0;
11242         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11243         stcb->asoc.ctrl_queue_cnt++;
11244         SCTP_STAT_INCR(sctps_sendheartbeat);
11245         return;
11246 }
11247
11248 void
11249 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11250     uint32_t high_tsn)
11251 {
11252         struct sctp_association *asoc;
11253         struct sctp_ecne_chunk *ecne;
11254         struct sctp_tmit_chunk *chk;
11255
11256         if (net == NULL) {
11257                 return;
11258         }
11259         asoc = &stcb->asoc;
11260         SCTP_TCB_LOCK_ASSERT(stcb);
11261         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11262                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11263                         /* found a previous ECN_ECHO update it if needed */
11264                         uint32_t cnt, ctsn;
11265
11266                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11267                         ctsn = ntohl(ecne->tsn);
11268                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11269                                 ecne->tsn = htonl(high_tsn);
11270                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11271                         }
11272                         cnt = ntohl(ecne->num_pkts_since_cwr);
11273                         cnt++;
11274                         ecne->num_pkts_since_cwr = htonl(cnt);
11275                         return;
11276                 }
11277         }
11278         /* nope could not find one to update so we must build one */
11279         sctp_alloc_a_chunk(stcb, chk);
11280         if (chk == NULL) {
11281                 return;
11282         }
11283         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11284         chk->copy_by_ref = 0;
11285         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11286         chk->rec.chunk_id.can_take_data = 0;
11287         chk->flags = 0;
11288         chk->asoc = &stcb->asoc;
11289         chk->send_size = sizeof(struct sctp_ecne_chunk);
11290         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11291         if (chk->data == NULL) {
11292                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11293                 return;
11294         }
11295         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11296         SCTP_BUF_LEN(chk->data) = chk->send_size;
11297         chk->sent = SCTP_DATAGRAM_UNSENT;
11298         chk->snd_count = 0;
11299         chk->whoTo = net;
11300         atomic_add_int(&chk->whoTo->ref_count, 1);
11301
11302         stcb->asoc.ecn_echo_cnt_onq++;
11303         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11304         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11305         ecne->ch.chunk_flags = 0;
11306         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11307         ecne->tsn = htonl(high_tsn);
11308         ecne->num_pkts_since_cwr = htonl(1);
11309         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11310         asoc->ctrl_queue_cnt++;
11311 }
11312
11313 void
11314 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11315     struct mbuf *m, int len, int iphlen, int bad_crc)
11316 {
11317         struct sctp_association *asoc;
11318         struct sctp_pktdrop_chunk *drp;
11319         struct sctp_tmit_chunk *chk;
11320         uint8_t *datap;
11321         int was_trunc = 0;
11322         int fullsz = 0;
11323         long spc;
11324         int offset;
11325         struct sctp_chunkhdr *ch, chunk_buf;
11326         unsigned int chk_length;
11327
11328         if (!stcb) {
11329                 return;
11330         }
11331         asoc = &stcb->asoc;
11332         SCTP_TCB_LOCK_ASSERT(stcb);
11333         if (asoc->pktdrop_supported == 0) {
11334                 /*-
11335                  * peer must declare support before I send one.
11336                  */
11337                 return;
11338         }
11339         if (stcb->sctp_socket == NULL) {
11340                 return;
11341         }
11342         sctp_alloc_a_chunk(stcb, chk);
11343         if (chk == NULL) {
11344                 return;
11345         }
11346         chk->copy_by_ref = 0;
11347         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11348         chk->rec.chunk_id.can_take_data = 1;
11349         chk->flags = 0;
11350         len -= iphlen;
11351         chk->send_size = len;
11352         /* Validate that we do not have an ABORT in here. */
11353         offset = iphlen + sizeof(struct sctphdr);
11354         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11355             sizeof(*ch), (uint8_t *) & chunk_buf);
11356         while (ch != NULL) {
11357                 chk_length = ntohs(ch->chunk_length);
11358                 if (chk_length < sizeof(*ch)) {
11359                         /* break to abort land */
11360                         break;
11361                 }
11362                 switch (ch->chunk_type) {
11363                 case SCTP_PACKET_DROPPED:
11364                 case SCTP_ABORT_ASSOCIATION:
11365                 case SCTP_INITIATION_ACK:
11366                         /**
11367                          * We don't respond with an PKT-DROP to an ABORT
11368                          * or PKT-DROP. We also do not respond to an
11369                          * INIT-ACK, because we can't know if the initiation
11370                          * tag is correct or not.
11371                          */
11372                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11373                         return;
11374                 default:
11375                         break;
11376                 }
11377                 offset += SCTP_SIZE32(chk_length);
11378                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11379                     sizeof(*ch), (uint8_t *) & chunk_buf);
11380         }
11381
11382         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11383             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11384                 /*
11385                  * only send 1 mtu worth, trim off the excess on the end.
11386                  */
11387                 fullsz = len;
11388                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11389                 was_trunc = 1;
11390         }
11391         chk->asoc = &stcb->asoc;
11392         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11393         if (chk->data == NULL) {
11394 jump_out:
11395                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11396                 return;
11397         }
11398         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11399         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11400         if (drp == NULL) {
11401                 sctp_m_freem(chk->data);
11402                 chk->data = NULL;
11403                 goto jump_out;
11404         }
11405         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11406             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11407         chk->book_size_scale = 0;
11408         if (was_trunc) {
11409                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11410                 drp->trunc_len = htons(fullsz);
11411                 /*
11412                  * Len is already adjusted to size minus overhead above take
11413                  * out the pkt_drop chunk itself from it.
11414                  */
11415                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11416                 len = chk->send_size;
11417         } else {
11418                 /* no truncation needed */
11419                 drp->ch.chunk_flags = 0;
11420                 drp->trunc_len = htons(0);
11421         }
11422         if (bad_crc) {
11423                 drp->ch.chunk_flags |= SCTP_BADCRC;
11424         }
11425         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11426         SCTP_BUF_LEN(chk->data) = chk->send_size;
11427         chk->sent = SCTP_DATAGRAM_UNSENT;
11428         chk->snd_count = 0;
11429         if (net) {
11430                 /* we should hit here */
11431                 chk->whoTo = net;
11432                 atomic_add_int(&chk->whoTo->ref_count, 1);
11433         } else {
11434                 chk->whoTo = NULL;
11435         }
11436         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11437         drp->ch.chunk_length = htons(chk->send_size);
11438         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11439         if (spc < 0) {
11440                 spc = 0;
11441         }
11442         drp->bottle_bw = htonl(spc);
11443         if (asoc->my_rwnd) {
11444                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11445                     asoc->size_on_all_streams +
11446                     asoc->my_rwnd_control_len +
11447                     stcb->sctp_socket->so_rcv.sb_cc);
11448         } else {
11449                 /*-
11450                  * If my rwnd is 0, possibly from mbuf depletion as well as
11451                  * space used, tell the peer there is NO space aka onq == bw
11452                  */
11453                 drp->current_onq = htonl(spc);
11454         }
11455         drp->reserved = 0;
11456         datap = drp->data;
11457         m_copydata(m, iphlen, len, (caddr_t)datap);
11458         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11459         asoc->ctrl_queue_cnt++;
11460 }
11461
11462 void
11463 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11464 {
11465         struct sctp_association *asoc;
11466         struct sctp_cwr_chunk *cwr;
11467         struct sctp_tmit_chunk *chk;
11468
11469         SCTP_TCB_LOCK_ASSERT(stcb);
11470         if (net == NULL) {
11471                 return;
11472         }
11473         asoc = &stcb->asoc;
11474         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11475                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11476                         /*
11477                          * found a previous CWR queued to same destination
11478                          * update it if needed
11479                          */
11480                         uint32_t ctsn;
11481
11482                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11483                         ctsn = ntohl(cwr->tsn);
11484                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11485                                 cwr->tsn = htonl(high_tsn);
11486                         }
11487                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11488                                 /* Make sure override is carried */
11489                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11490                         }
11491                         return;
11492                 }
11493         }
11494         sctp_alloc_a_chunk(stcb, chk);
11495         if (chk == NULL) {
11496                 return;
11497         }
11498         chk->copy_by_ref = 0;
11499         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11500         chk->rec.chunk_id.can_take_data = 1;
11501         chk->flags = 0;
11502         chk->asoc = &stcb->asoc;
11503         chk->send_size = sizeof(struct sctp_cwr_chunk);
11504         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11505         if (chk->data == NULL) {
11506                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11507                 return;
11508         }
11509         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11510         SCTP_BUF_LEN(chk->data) = chk->send_size;
11511         chk->sent = SCTP_DATAGRAM_UNSENT;
11512         chk->snd_count = 0;
11513         chk->whoTo = net;
11514         atomic_add_int(&chk->whoTo->ref_count, 1);
11515         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11516         cwr->ch.chunk_type = SCTP_ECN_CWR;
11517         cwr->ch.chunk_flags = override;
11518         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11519         cwr->tsn = htonl(high_tsn);
11520         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11521         asoc->ctrl_queue_cnt++;
11522 }
11523
11524 static int
11525 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11526     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11527 {
11528         uint16_t len, old_len, i;
11529         struct sctp_stream_reset_out_request *req_out;
11530         struct sctp_chunkhdr *ch;
11531         int at;
11532         int number_entries = 0;
11533
11534         ch = mtod(chk->data, struct sctp_chunkhdr *);
11535         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11536         /* get to new offset for the param. */
11537         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11538         /* now how long will this param be? */
11539         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11540                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11541                     (TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue))) {
11542                         number_entries++;
11543                 }
11544         }
11545         if (number_entries == 0) {
11546                 return (0);
11547         }
11548         if (number_entries == stcb->asoc.streamoutcnt) {
11549                 number_entries = 0;
11550         }
11551         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11552                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11553         }
11554         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11555         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11556         req_out->ph.param_length = htons(len);
11557         req_out->request_seq = htonl(seq);
11558         req_out->response_seq = htonl(resp_seq);
11559         req_out->send_reset_at_tsn = htonl(last_sent);
11560         at = 0;
11561         if (number_entries) {
11562                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11563                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11564                             (TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue))) {
11565                                 req_out->list_of_streams[at] = htons(i);
11566                                 at++;
11567                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11568                                 if (at >= number_entries) {
11569                                         break;
11570                                 }
11571                         }
11572                 }
11573         } else {
11574                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11575                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11576                 }
11577         }
11578         if (SCTP_SIZE32(len) > len) {
11579                 /*-
11580                  * Need to worry about the pad we may end up adding to the
11581                  * end. This is easy since the struct is either aligned to 4
11582                  * bytes or 2 bytes off.
11583                  */
11584                 req_out->list_of_streams[number_entries] = 0;
11585         }
11586         /* now fix the chunk length */
11587         ch->chunk_length = htons(len + old_len);
11588         chk->book_size = len + old_len;
11589         chk->book_size_scale = 0;
11590         chk->send_size = SCTP_SIZE32(chk->book_size);
11591         SCTP_BUF_LEN(chk->data) = chk->send_size;
11592         return (1);
11593 }
11594
11595 static void
11596 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11597     int number_entries, uint16_t * list,
11598     uint32_t seq)
11599 {
11600         uint16_t len, old_len, i;
11601         struct sctp_stream_reset_in_request *req_in;
11602         struct sctp_chunkhdr *ch;
11603
11604         ch = mtod(chk->data, struct sctp_chunkhdr *);
11605         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11606
11607         /* get to new offset for the param. */
11608         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11609         /* now how long will this param be? */
11610         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11611         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11612         req_in->ph.param_length = htons(len);
11613         req_in->request_seq = htonl(seq);
11614         if (number_entries) {
11615                 for (i = 0; i < number_entries; i++) {
11616                         req_in->list_of_streams[i] = htons(list[i]);
11617                 }
11618         }
11619         if (SCTP_SIZE32(len) > len) {
11620                 /*-
11621                  * Need to worry about the pad we may end up adding to the
11622                  * end. This is easy since the struct is either aligned to 4
11623                  * bytes or 2 bytes off.
11624                  */
11625                 req_in->list_of_streams[number_entries] = 0;
11626         }
11627         /* now fix the chunk length */
11628         ch->chunk_length = htons(len + old_len);
11629         chk->book_size = len + old_len;
11630         chk->book_size_scale = 0;
11631         chk->send_size = SCTP_SIZE32(chk->book_size);
11632         SCTP_BUF_LEN(chk->data) = chk->send_size;
11633         return;
11634 }
11635
11636 static void
11637 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11638     uint32_t seq)
11639 {
11640         uint16_t len, old_len;
11641         struct sctp_stream_reset_tsn_request *req_tsn;
11642         struct sctp_chunkhdr *ch;
11643
11644         ch = mtod(chk->data, struct sctp_chunkhdr *);
11645         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11646
11647         /* get to new offset for the param. */
11648         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11649         /* now how long will this param be? */
11650         len = sizeof(struct sctp_stream_reset_tsn_request);
11651         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11652         req_tsn->ph.param_length = htons(len);
11653         req_tsn->request_seq = htonl(seq);
11654
11655         /* now fix the chunk length */
11656         ch->chunk_length = htons(len + old_len);
11657         chk->send_size = len + old_len;
11658         chk->book_size = SCTP_SIZE32(chk->send_size);
11659         chk->book_size_scale = 0;
11660         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11661         return;
11662 }
11663
11664 void
11665 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11666     uint32_t resp_seq, uint32_t result)
11667 {
11668         uint16_t len, old_len;
11669         struct sctp_stream_reset_response *resp;
11670         struct sctp_chunkhdr *ch;
11671
11672         ch = mtod(chk->data, struct sctp_chunkhdr *);
11673         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11674
11675         /* get to new offset for the param. */
11676         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11677         /* now how long will this param be? */
11678         len = sizeof(struct sctp_stream_reset_response);
11679         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11680         resp->ph.param_length = htons(len);
11681         resp->response_seq = htonl(resp_seq);
11682         resp->result = ntohl(result);
11683
11684         /* now fix the chunk length */
11685         ch->chunk_length = htons(len + old_len);
11686         chk->book_size = len + old_len;
11687         chk->book_size_scale = 0;
11688         chk->send_size = SCTP_SIZE32(chk->book_size);
11689         SCTP_BUF_LEN(chk->data) = chk->send_size;
11690         return;
11691 }
11692
11693 void
11694 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11695     struct sctp_stream_reset_list *ent,
11696     int response)
11697 {
11698         struct sctp_association *asoc;
11699         struct sctp_tmit_chunk *chk;
11700         struct sctp_chunkhdr *ch;
11701
11702         asoc = &stcb->asoc;
11703
11704         /*
11705          * Reset our last reset action to the new one IP -> response
11706          * (PERFORMED probably). This assures that if we fail to send, a
11707          * retran from the peer will get the new response.
11708          */
11709         asoc->last_reset_action[0] = response;
11710         if (asoc->stream_reset_outstanding) {
11711                 return;
11712         }
11713         sctp_alloc_a_chunk(stcb, chk);
11714         if (chk == NULL) {
11715                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11716                 return;
11717         }
11718         chk->copy_by_ref = 0;
11719         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11720         chk->rec.chunk_id.can_take_data = 0;
11721         chk->flags = 0;
11722         chk->asoc = &stcb->asoc;
11723         chk->book_size = sizeof(struct sctp_chunkhdr);
11724         chk->send_size = SCTP_SIZE32(chk->book_size);
11725         chk->book_size_scale = 0;
11726         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11727         if (chk->data == NULL) {
11728                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11729                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11730                 return;
11731         }
11732         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11733         sctp_add_stream_reset_result(chk, ent->seq, response);
11734         /* setup chunk parameters */
11735         chk->sent = SCTP_DATAGRAM_UNSENT;
11736         chk->snd_count = 0;
11737         if (stcb->asoc.alternate) {
11738                 chk->whoTo = stcb->asoc.alternate;
11739         } else {
11740                 chk->whoTo = stcb->asoc.primary_destination;
11741         }
11742         ch = mtod(chk->data, struct sctp_chunkhdr *);
11743         ch->chunk_type = SCTP_STREAM_RESET;
11744         ch->chunk_flags = 0;
11745         ch->chunk_length = htons(chk->book_size);
11746         atomic_add_int(&chk->whoTo->ref_count, 1);
11747         SCTP_BUF_LEN(chk->data) = chk->send_size;
11748         /* insert the chunk for sending */
11749         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11750             chk,
11751             sctp_next);
11752         asoc->ctrl_queue_cnt++;
11753 }
11754
11755 void
11756 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11757     uint32_t resp_seq, uint32_t result,
11758     uint32_t send_una, uint32_t recv_next)
11759 {
11760         uint16_t len, old_len;
11761         struct sctp_stream_reset_response_tsn *resp;
11762         struct sctp_chunkhdr *ch;
11763
11764         ch = mtod(chk->data, struct sctp_chunkhdr *);
11765         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11766
11767         /* get to new offset for the param. */
11768         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11769         /* now how long will this param be? */
11770         len = sizeof(struct sctp_stream_reset_response_tsn);
11771         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11772         resp->ph.param_length = htons(len);
11773         resp->response_seq = htonl(resp_seq);
11774         resp->result = htonl(result);
11775         resp->senders_next_tsn = htonl(send_una);
11776         resp->receivers_next_tsn = htonl(recv_next);
11777
11778         /* now fix the chunk length */
11779         ch->chunk_length = htons(len + old_len);
11780         chk->book_size = len + old_len;
11781         chk->send_size = SCTP_SIZE32(chk->book_size);
11782         chk->book_size_scale = 0;
11783         SCTP_BUF_LEN(chk->data) = chk->send_size;
11784         return;
11785 }
11786
11787 static void
11788 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11789     uint32_t seq,
11790     uint16_t adding)
11791 {
11792         uint16_t len, old_len;
11793         struct sctp_chunkhdr *ch;
11794         struct sctp_stream_reset_add_strm *addstr;
11795
11796         ch = mtod(chk->data, struct sctp_chunkhdr *);
11797         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11798
11799         /* get to new offset for the param. */
11800         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11801         /* now how long will this param be? */
11802         len = sizeof(struct sctp_stream_reset_add_strm);
11803
11804         /* Fill it out. */
11805         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11806         addstr->ph.param_length = htons(len);
11807         addstr->request_seq = htonl(seq);
11808         addstr->number_of_streams = htons(adding);
11809         addstr->reserved = 0;
11810
11811         /* now fix the chunk length */
11812         ch->chunk_length = htons(len + old_len);
11813         chk->send_size = len + old_len;
11814         chk->book_size = SCTP_SIZE32(chk->send_size);
11815         chk->book_size_scale = 0;
11816         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11817         return;
11818 }
11819
11820 static void
11821 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11822     uint32_t seq,
11823     uint16_t adding)
11824 {
11825         uint16_t len, old_len;
11826         struct sctp_chunkhdr *ch;
11827         struct sctp_stream_reset_add_strm *addstr;
11828
11829         ch = mtod(chk->data, struct sctp_chunkhdr *);
11830         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11831
11832         /* get to new offset for the param. */
11833         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11834         /* now how long will this param be? */
11835         len = sizeof(struct sctp_stream_reset_add_strm);
11836         /* Fill it out. */
11837         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11838         addstr->ph.param_length = htons(len);
11839         addstr->request_seq = htonl(seq);
11840         addstr->number_of_streams = htons(adding);
11841         addstr->reserved = 0;
11842
11843         /* now fix the chunk length */
11844         ch->chunk_length = htons(len + old_len);
11845         chk->send_size = len + old_len;
11846         chk->book_size = SCTP_SIZE32(chk->send_size);
11847         chk->book_size_scale = 0;
11848         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11849         return;
11850 }
11851
11852 int
11853 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11854 {
11855         struct sctp_association *asoc;
11856         struct sctp_tmit_chunk *chk;
11857         struct sctp_chunkhdr *ch;
11858         uint32_t seq;
11859
11860         asoc = &stcb->asoc;
11861         if (asoc->stream_reset_outstanding) {
11862                 return (EALREADY);
11863         }
11864         sctp_alloc_a_chunk(stcb, chk);
11865         if (chk == NULL) {
11866                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11867                 return (ENOMEM);
11868         }
11869         chk->copy_by_ref = 0;
11870         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11871         chk->rec.chunk_id.can_take_data = 0;
11872         chk->flags = 0;
11873         chk->asoc = &stcb->asoc;
11874         chk->book_size = sizeof(struct sctp_chunkhdr);
11875         chk->send_size = SCTP_SIZE32(chk->book_size);
11876         chk->book_size_scale = 0;
11877         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11878         if (chk->data == NULL) {
11879                 sctp_free_a_chunk(stcb, chk, so_locked);
11880                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11881                 return (ENOMEM);
11882         }
11883         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11884
11885         /* setup chunk parameters */
11886         chk->sent = SCTP_DATAGRAM_UNSENT;
11887         chk->snd_count = 0;
11888         if (stcb->asoc.alternate) {
11889                 chk->whoTo = stcb->asoc.alternate;
11890         } else {
11891                 chk->whoTo = stcb->asoc.primary_destination;
11892         }
11893         ch = mtod(chk->data, struct sctp_chunkhdr *);
11894         ch->chunk_type = SCTP_STREAM_RESET;
11895         ch->chunk_flags = 0;
11896         ch->chunk_length = htons(chk->book_size);
11897         atomic_add_int(&chk->whoTo->ref_count, 1);
11898         SCTP_BUF_LEN(chk->data) = chk->send_size;
11899         seq = stcb->asoc.str_reset_seq_out;
11900         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11901                 seq++;
11902                 asoc->stream_reset_outstanding++;
11903         } else {
11904                 m_freem(chk->data);
11905                 chk->data = NULL;
11906                 sctp_free_a_chunk(stcb, chk, so_locked);
11907                 return (ENOENT);
11908         }
11909         asoc->str_reset = chk;
11910         /* insert the chunk for sending */
11911         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11912             chk,
11913             sctp_next);
11914         asoc->ctrl_queue_cnt++;
11915
11916         if (stcb->asoc.send_sack) {
11917                 sctp_send_sack(stcb, so_locked);
11918         }
11919         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11920         return (0);
11921 }
11922
11923 int
11924 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11925     uint16_t number_entries, uint16_t * list,
11926     uint8_t send_in_req,
11927     uint8_t send_tsn_req,
11928     uint8_t add_stream,
11929     uint16_t adding_o,
11930     uint16_t adding_i, uint8_t peer_asked)
11931 {
11932         struct sctp_association *asoc;
11933         struct sctp_tmit_chunk *chk;
11934         struct sctp_chunkhdr *ch;
11935         int can_send_out_req = 0;
11936         uint32_t seq;
11937
11938         asoc = &stcb->asoc;
11939         if (asoc->stream_reset_outstanding) {
11940                 /*-
11941                  * Already one pending, must get ACK back to clear the flag.
11942                  */
11943                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11944                 return (EBUSY);
11945         }
11946         if ((send_in_req == 0) && (send_tsn_req == 0) &&
11947             (add_stream == 0)) {
11948                 /* nothing to do */
11949                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11950                 return (EINVAL);
11951         }
11952         if (send_tsn_req && send_in_req) {
11953                 /* error, can't do that */
11954                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11955                 return (EINVAL);
11956         } else if (send_in_req) {
11957                 can_send_out_req = 1;
11958         }
11959         if (number_entries > (MCLBYTES -
11960             SCTP_MIN_OVERHEAD -
11961             sizeof(struct sctp_chunkhdr) -
11962             sizeof(struct sctp_stream_reset_out_request)) /
11963             sizeof(uint16_t)) {
11964                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11965                 return (ENOMEM);
11966         }
11967         sctp_alloc_a_chunk(stcb, chk);
11968         if (chk == NULL) {
11969                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11970                 return (ENOMEM);
11971         }
11972         chk->copy_by_ref = 0;
11973         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11974         chk->rec.chunk_id.can_take_data = 0;
11975         chk->flags = 0;
11976         chk->asoc = &stcb->asoc;
11977         chk->book_size = sizeof(struct sctp_chunkhdr);
11978         chk->send_size = SCTP_SIZE32(chk->book_size);
11979         chk->book_size_scale = 0;
11980
11981         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11982         if (chk->data == NULL) {
11983                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11984                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11985                 return (ENOMEM);
11986         }
11987         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11988
11989         /* setup chunk parameters */
11990         chk->sent = SCTP_DATAGRAM_UNSENT;
11991         chk->snd_count = 0;
11992         if (stcb->asoc.alternate) {
11993                 chk->whoTo = stcb->asoc.alternate;
11994         } else {
11995                 chk->whoTo = stcb->asoc.primary_destination;
11996         }
11997         atomic_add_int(&chk->whoTo->ref_count, 1);
11998         ch = mtod(chk->data, struct sctp_chunkhdr *);
11999         ch->chunk_type = SCTP_STREAM_RESET;
12000         ch->chunk_flags = 0;
12001         ch->chunk_length = htons(chk->book_size);
12002         SCTP_BUF_LEN(chk->data) = chk->send_size;
12003
12004         seq = stcb->asoc.str_reset_seq_out;
12005         if (can_send_out_req) {
12006                 int ret;
12007
12008                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12009                 if (ret) {
12010                         seq++;
12011                         asoc->stream_reset_outstanding++;
12012                 }
12013         }
12014         if ((add_stream & 1) &&
12015             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12016                 /* Need to allocate more */
12017                 struct sctp_stream_out *oldstream;
12018                 struct sctp_stream_queue_pending *sp, *nsp;
12019                 int i;
12020
12021 #if defined(SCTP_DETAILED_STR_STATS)
12022                 int j;
12023
12024 #endif
12025
12026                 oldstream = stcb->asoc.strmout;
12027                 /* get some more */
12028                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12029                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
12030                     SCTP_M_STRMO);
12031                 if (stcb->asoc.strmout == NULL) {
12032                         uint8_t x;
12033
12034                         stcb->asoc.strmout = oldstream;
12035                         /* Turn off the bit */
12036                         x = add_stream & 0xfe;
12037                         add_stream = x;
12038                         goto skip_stuff;
12039                 }
12040                 /*
12041                  * Ok now we proceed with copying the old out stuff and
12042                  * initializing the new stuff.
12043                  */
12044                 SCTP_TCB_SEND_LOCK(stcb);
12045                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12046                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12047                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12048                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12049                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
12050                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12051                         stcb->asoc.strmout[i].stream_no = i;
12052                         stcb->asoc.strmout[i].state = oldstream[i].state;
12053                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
12054                         /* now anything on those queues? */
12055                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12056                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12057                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12058                         }
12059                         /* Now move assoc pointers too */
12060                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
12061                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
12062                         }
12063                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
12064                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
12065                         }
12066                 }
12067                 /* now the new streams */
12068                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12069                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12070                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12071                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12072 #if defined(SCTP_DETAILED_STR_STATS)
12073                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12074                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12075                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12076                         }
12077 #else
12078                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12079                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12080 #endif
12081                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
12082                         stcb->asoc.strmout[i].stream_no = i;
12083                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12084                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12085                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12086                 }
12087                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12088                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12089                 SCTP_TCB_SEND_UNLOCK(stcb);
12090         }
12091 skip_stuff:
12092         if ((add_stream & 1) && (adding_o > 0)) {
12093                 asoc->strm_pending_add_size = adding_o;
12094                 asoc->peer_req_out = peer_asked;
12095                 sctp_add_an_out_stream(chk, seq, adding_o);
12096                 seq++;
12097                 asoc->stream_reset_outstanding++;
12098         }
12099         if ((add_stream & 2) && (adding_i > 0)) {
12100                 sctp_add_an_in_stream(chk, seq, adding_i);
12101                 seq++;
12102                 asoc->stream_reset_outstanding++;
12103         }
12104         if (send_in_req) {
12105                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12106                 seq++;
12107                 asoc->stream_reset_outstanding++;
12108         }
12109         if (send_tsn_req) {
12110                 sctp_add_stream_reset_tsn(chk, seq);
12111                 asoc->stream_reset_outstanding++;
12112         }
12113         asoc->str_reset = chk;
12114         /* insert the chunk for sending */
12115         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12116             chk,
12117             sctp_next);
12118         asoc->ctrl_queue_cnt++;
12119         if (stcb->asoc.send_sack) {
12120                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12121         }
12122         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12123         return (0);
12124 }
12125
12126 void
12127 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12128     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12129     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12130     uint32_t vrf_id, uint16_t port)
12131 {
12132         /* Don't respond to an ABORT with an ABORT. */
12133         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12134                 if (cause)
12135                         sctp_m_freem(cause);
12136                 return;
12137         }
12138         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12139             mflowtype, mflowid, fibnum,
12140             vrf_id, port);
12141         return;
12142 }
12143
12144 void
12145 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12146     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12147     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12148     uint32_t vrf_id, uint16_t port)
12149 {
12150         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12151             mflowtype, mflowid, fibnum,
12152             vrf_id, port);
12153         return;
12154 }
12155
12156 static struct mbuf *
12157 sctp_copy_resume(struct uio *uio,
12158     int max_send_len,
12159     int user_marks_eor,
12160     int *error,
12161     uint32_t * sndout,
12162     struct mbuf **new_tail)
12163 {
12164         struct mbuf *m;
12165
12166         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12167             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12168         if (m == NULL) {
12169                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12170                 *error = ENOBUFS;
12171         } else {
12172                 *sndout = m_length(m, NULL);
12173                 *new_tail = m_last(m);
12174         }
12175         return (m);
12176 }
12177
12178 static int
12179 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12180     struct uio *uio,
12181     int resv_upfront)
12182 {
12183         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12184             resv_upfront, 0);
12185         if (sp->data == NULL) {
12186                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12187                 return (ENOBUFS);
12188         }
12189         sp->tail_mbuf = m_last(sp->data);
12190         return (0);
12191 }
12192
12193
12194
12195 static struct sctp_stream_queue_pending *
12196 sctp_copy_it_in(struct sctp_tcb *stcb,
12197     struct sctp_association *asoc,
12198     struct sctp_sndrcvinfo *srcv,
12199     struct uio *uio,
12200     struct sctp_nets *net,
12201     int max_send_len,
12202     int user_marks_eor,
12203     int *error)
12204 {
12205         /*-
12206          * This routine must be very careful in its work. Protocol
12207          * processing is up and running so care must be taken to spl...()
12208          * when you need to do something that may effect the stcb/asoc. The
12209          * sb is locked however. When data is copied the protocol processing
12210          * should be enabled since this is a slower operation...
12211          */
12212         struct sctp_stream_queue_pending *sp = NULL;
12213         int resv_in_first;
12214
12215         *error = 0;
12216         /* Now can we send this? */
12217         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12218             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12219             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12220             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12221                 /* got data while shutting down */
12222                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12223                 *error = ECONNRESET;
12224                 goto out_now;
12225         }
12226         sctp_alloc_a_strmoq(stcb, sp);
12227         if (sp == NULL) {
12228                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12229                 *error = ENOMEM;
12230                 goto out_now;
12231         }
12232         sp->act_flags = 0;
12233         sp->sender_all_done = 0;
12234         sp->sinfo_flags = srcv->sinfo_flags;
12235         sp->timetolive = srcv->sinfo_timetolive;
12236         sp->ppid = srcv->sinfo_ppid;
12237         sp->context = srcv->sinfo_context;
12238         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12239
12240         sp->stream = srcv->sinfo_stream;
12241         sp->length = min(uio->uio_resid, max_send_len);
12242         if ((sp->length == (uint32_t) uio->uio_resid) &&
12243             ((user_marks_eor == 0) ||
12244             (srcv->sinfo_flags & SCTP_EOF) ||
12245             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12246                 sp->msg_is_complete = 1;
12247         } else {
12248                 sp->msg_is_complete = 0;
12249         }
12250         sp->sender_all_done = 0;
12251         sp->some_taken = 0;
12252         sp->put_last_out = 0;
12253         resv_in_first = sizeof(struct sctp_data_chunk);
12254         sp->data = sp->tail_mbuf = NULL;
12255         if (sp->length == 0) {
12256                 *error = 0;
12257                 goto skip_copy;
12258         }
12259         if (srcv->sinfo_keynumber_valid) {
12260                 sp->auth_keyid = srcv->sinfo_keynumber;
12261         } else {
12262                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12263         }
12264         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12265                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12266                 sp->holds_key_ref = 1;
12267         }
12268         *error = sctp_copy_one(sp, uio, resv_in_first);
12269 skip_copy:
12270         if (*error) {
12271                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12272                 sp = NULL;
12273         } else {
12274                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12275                         sp->net = net;
12276                         atomic_add_int(&sp->net->ref_count, 1);
12277                 } else {
12278                         sp->net = NULL;
12279                 }
12280                 sctp_set_prsctp_policy(sp);
12281         }
12282 out_now:
12283         return (sp);
12284 }
12285
12286
12287 int
12288 sctp_sosend(struct socket *so,
12289     struct sockaddr *addr,
12290     struct uio *uio,
12291     struct mbuf *top,
12292     struct mbuf *control,
12293     int flags,
12294     struct thread *p
12295 )
12296 {
12297         int error, use_sndinfo = 0;
12298         struct sctp_sndrcvinfo sndrcvninfo;
12299         struct sockaddr *addr_to_use;
12300
12301 #if defined(INET) && defined(INET6)
12302         struct sockaddr_in sin;
12303
12304 #endif
12305
12306         if (control) {
12307                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12308                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12309                     sizeof(sndrcvninfo))) {
12310                         /* got one */
12311                         use_sndinfo = 1;
12312                 }
12313         }
12314         addr_to_use = addr;
12315 #if defined(INET) && defined(INET6)
12316         if ((addr) && (addr->sa_family == AF_INET6)) {
12317                 struct sockaddr_in6 *sin6;
12318
12319                 sin6 = (struct sockaddr_in6 *)addr;
12320                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12321                         in6_sin6_2_sin(&sin, sin6);
12322                         addr_to_use = (struct sockaddr *)&sin;
12323                 }
12324         }
12325 #endif
12326         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12327             control,
12328             flags,
12329             use_sndinfo ? &sndrcvninfo : NULL
12330             ,p
12331             );
12332         return (error);
12333 }
12334
12335
12336 int
12337 sctp_lower_sosend(struct socket *so,
12338     struct sockaddr *addr,
12339     struct uio *uio,
12340     struct mbuf *i_pak,
12341     struct mbuf *control,
12342     int flags,
12343     struct sctp_sndrcvinfo *srcv
12344     ,
12345     struct thread *p
12346 )
12347 {
12348         unsigned int sndlen = 0, max_len;
12349         int error, len;
12350         struct mbuf *top = NULL;
12351         int queue_only = 0, queue_only_for_init = 0;
12352         int free_cnt_applied = 0;
12353         int un_sent;
12354         int now_filled = 0;
12355         unsigned int inqueue_bytes = 0;
12356         struct sctp_block_entry be;
12357         struct sctp_inpcb *inp;
12358         struct sctp_tcb *stcb = NULL;
12359         struct timeval now;
12360         struct sctp_nets *net;
12361         struct sctp_association *asoc;
12362         struct sctp_inpcb *t_inp;
12363         int user_marks_eor;
12364         int create_lock_applied = 0;
12365         int nagle_applies = 0;
12366         int some_on_control = 0;
12367         int got_all_of_the_send = 0;
12368         int hold_tcblock = 0;
12369         int non_blocking = 0;
12370         uint32_t local_add_more, local_soresv = 0;
12371         uint16_t port;
12372         uint16_t sinfo_flags;
12373         sctp_assoc_t sinfo_assoc_id;
12374
12375         error = 0;
12376         net = NULL;
12377         stcb = NULL;
12378         asoc = NULL;
12379
12380         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12381         if (inp == NULL) {
12382                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12383                 error = EINVAL;
12384                 if (i_pak) {
12385                         SCTP_RELEASE_PKT(i_pak);
12386                 }
12387                 return (error);
12388         }
12389         if ((uio == NULL) && (i_pak == NULL)) {
12390                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12391                 return (EINVAL);
12392         }
12393         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12394         atomic_add_int(&inp->total_sends, 1);
12395         if (uio) {
12396                 if (uio->uio_resid < 0) {
12397                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12398                         return (EINVAL);
12399                 }
12400                 sndlen = uio->uio_resid;
12401         } else {
12402                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12403                 sndlen = SCTP_HEADER_LEN(i_pak);
12404         }
12405         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12406             (void *)addr,
12407             sndlen);
12408         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12409             (inp->sctp_socket->so_qlimit)) {
12410                 /* The listener can NOT send */
12411                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12412                 error = ENOTCONN;
12413                 goto out_unlocked;
12414         }
12415         /**
12416          * Pre-screen address, if one is given the sin-len
12417          * must be set correctly!
12418          */
12419         if (addr) {
12420                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12421
12422                 switch (raddr->sa.sa_family) {
12423 #ifdef INET
12424                 case AF_INET:
12425                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12426                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12427                                 error = EINVAL;
12428                                 goto out_unlocked;
12429                         }
12430                         port = raddr->sin.sin_port;
12431                         break;
12432 #endif
12433 #ifdef INET6
12434                 case AF_INET6:
12435                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12436                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12437                                 error = EINVAL;
12438                                 goto out_unlocked;
12439                         }
12440                         port = raddr->sin6.sin6_port;
12441                         break;
12442 #endif
12443                 default:
12444                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12445                         error = EAFNOSUPPORT;
12446                         goto out_unlocked;
12447                 }
12448         } else
12449                 port = 0;
12450
12451         if (srcv) {
12452                 sinfo_flags = srcv->sinfo_flags;
12453                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12454                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12455                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12456                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12457                         error = EINVAL;
12458                         goto out_unlocked;
12459                 }
12460                 if (srcv->sinfo_flags)
12461                         SCTP_STAT_INCR(sctps_sends_with_flags);
12462         } else {
12463                 sinfo_flags = inp->def_send.sinfo_flags;
12464                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12465         }
12466         if (sinfo_flags & SCTP_SENDALL) {
12467                 /* its a sendall */
12468                 error = sctp_sendall(inp, uio, top, srcv);
12469                 top = NULL;
12470                 goto out_unlocked;
12471         }
12472         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12473                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12474                 error = EINVAL;
12475                 goto out_unlocked;
12476         }
12477         /* now we must find the assoc */
12478         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12479             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12480                 SCTP_INP_RLOCK(inp);
12481                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12482                 if (stcb) {
12483                         SCTP_TCB_LOCK(stcb);
12484                         hold_tcblock = 1;
12485                 }
12486                 SCTP_INP_RUNLOCK(inp);
12487         } else if (sinfo_assoc_id) {
12488                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12489         } else if (addr) {
12490                 /*-
12491                  * Since we did not use findep we must
12492                  * increment it, and if we don't find a tcb
12493                  * decrement it.
12494                  */
12495                 SCTP_INP_WLOCK(inp);
12496                 SCTP_INP_INCR_REF(inp);
12497                 SCTP_INP_WUNLOCK(inp);
12498                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12499                 if (stcb == NULL) {
12500                         SCTP_INP_WLOCK(inp);
12501                         SCTP_INP_DECR_REF(inp);
12502                         SCTP_INP_WUNLOCK(inp);
12503                 } else {
12504                         hold_tcblock = 1;
12505                 }
12506         }
12507         if ((stcb == NULL) && (addr)) {
12508                 /* Possible implicit send? */
12509                 SCTP_ASOC_CREATE_LOCK(inp);
12510                 create_lock_applied = 1;
12511                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12512                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12513                         /* Should I really unlock ? */
12514                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12515                         error = EINVAL;
12516                         goto out_unlocked;
12517
12518                 }
12519                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12520                     (addr->sa_family == AF_INET6)) {
12521                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12522                         error = EINVAL;
12523                         goto out_unlocked;
12524                 }
12525                 SCTP_INP_WLOCK(inp);
12526                 SCTP_INP_INCR_REF(inp);
12527                 SCTP_INP_WUNLOCK(inp);
12528                 /* With the lock applied look again */
12529                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12530                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12531                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12532                 }
12533                 if (stcb == NULL) {
12534                         SCTP_INP_WLOCK(inp);
12535                         SCTP_INP_DECR_REF(inp);
12536                         SCTP_INP_WUNLOCK(inp);
12537                 } else {
12538                         hold_tcblock = 1;
12539                 }
12540                 if (error) {
12541                         goto out_unlocked;
12542                 }
12543                 if (t_inp != inp) {
12544                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12545                         error = ENOTCONN;
12546                         goto out_unlocked;
12547                 }
12548         }
12549         if (stcb == NULL) {
12550                 if (addr == NULL) {
12551                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12552                         error = ENOENT;
12553                         goto out_unlocked;
12554                 } else {
12555                         /* We must go ahead and start the INIT process */
12556                         uint32_t vrf_id;
12557
12558                         if ((sinfo_flags & SCTP_ABORT) ||
12559                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12560                                 /*-
12561                                  * User asks to abort a non-existant assoc,
12562                                  * or EOF a non-existant assoc with no data
12563                                  */
12564                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12565                                 error = ENOENT;
12566                                 goto out_unlocked;
12567                         }
12568                         /* get an asoc/stcb struct */
12569                         vrf_id = inp->def_vrf_id;
12570 #ifdef INVARIANTS
12571                         if (create_lock_applied == 0) {
12572                                 panic("Error, should hold create lock and I don't?");
12573                         }
12574 #endif
12575                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12576                             p
12577                             );
12578                         if (stcb == NULL) {
12579                                 /* Error is setup for us in the call */
12580                                 goto out_unlocked;
12581                         }
12582                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12583                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12584                                 /*
12585                                  * Set the connected flag so we can queue
12586                                  * data
12587                                  */
12588                                 soisconnecting(so);
12589                         }
12590                         hold_tcblock = 1;
12591                         if (create_lock_applied) {
12592                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12593                                 create_lock_applied = 0;
12594                         } else {
12595                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12596                         }
12597                         /*
12598                          * Turn on queue only flag to prevent data from
12599                          * being sent
12600                          */
12601                         queue_only = 1;
12602                         asoc = &stcb->asoc;
12603                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12604                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12605
12606                         /* initialize authentication params for the assoc */
12607                         sctp_initialize_auth_params(inp, stcb);
12608
12609                         if (control) {
12610                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12611                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12612                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12613                                         hold_tcblock = 0;
12614                                         stcb = NULL;
12615                                         goto out_unlocked;
12616                                 }
12617                         }
12618                         /* out with the INIT */
12619                         queue_only_for_init = 1;
12620                         /*-
12621                          * we may want to dig in after this call and adjust the MTU
12622                          * value. It defaulted to 1500 (constant) but the ro
12623                          * structure may now have an update and thus we may need to
12624                          * change it BEFORE we append the message.
12625                          */
12626                 }
12627         } else
12628                 asoc = &stcb->asoc;
12629         if (srcv == NULL)
12630                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12631         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12632                 if (addr)
12633                         net = sctp_findnet(stcb, addr);
12634                 else
12635                         net = NULL;
12636                 if ((net == NULL) ||
12637                     ((port != 0) && (port != stcb->rport))) {
12638                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12639                         error = EINVAL;
12640                         goto out_unlocked;
12641                 }
12642         } else {
12643                 if (stcb->asoc.alternate) {
12644                         net = stcb->asoc.alternate;
12645                 } else {
12646                         net = stcb->asoc.primary_destination;
12647                 }
12648         }
12649         atomic_add_int(&stcb->total_sends, 1);
12650         /* Keep the stcb from being freed under our feet */
12651         atomic_add_int(&asoc->refcnt, 1);
12652         free_cnt_applied = 1;
12653
12654         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12655                 if (sndlen > asoc->smallest_mtu) {
12656                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12657                         error = EMSGSIZE;
12658                         goto out_unlocked;
12659                 }
12660         }
12661         if (SCTP_SO_IS_NBIO(so)
12662             || (flags & MSG_NBIO)
12663             ) {
12664                 non_blocking = 1;
12665         }
12666         /* would we block? */
12667         if (non_blocking) {
12668                 if (hold_tcblock == 0) {
12669                         SCTP_TCB_LOCK(stcb);
12670                         hold_tcblock = 1;
12671                 }
12672                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12673                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12674                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12675                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12676                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12677                                 error = EMSGSIZE;
12678                         else
12679                                 error = EWOULDBLOCK;
12680                         goto out_unlocked;
12681                 }
12682                 stcb->asoc.sb_send_resv += sndlen;
12683                 SCTP_TCB_UNLOCK(stcb);
12684                 hold_tcblock = 0;
12685         } else {
12686                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12687         }
12688         local_soresv = sndlen;
12689         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12690                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12691                 error = ECONNRESET;
12692                 goto out_unlocked;
12693         }
12694         if (create_lock_applied) {
12695                 SCTP_ASOC_CREATE_UNLOCK(inp);
12696                 create_lock_applied = 0;
12697         }
12698         /* Is the stream no. valid? */
12699         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12700                 /* Invalid stream number */
12701                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12702                 error = EINVAL;
12703                 goto out_unlocked;
12704         }
12705         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12706             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12707                 /*
12708                  * Can't queue any data while stream reset is underway.
12709                  */
12710                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12711                         error = EAGAIN;
12712                 } else {
12713                         error = EINVAL;
12714                 }
12715                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12716                 goto out_unlocked;
12717         }
12718         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12719             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12720                 queue_only = 1;
12721         }
12722         /* we are now done with all control */
12723         if (control) {
12724                 sctp_m_freem(control);
12725                 control = NULL;
12726         }
12727         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12728             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12729             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12730             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12731                 if (srcv->sinfo_flags & SCTP_ABORT) {
12732                         ;
12733                 } else {
12734                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12735                         error = ECONNRESET;
12736                         goto out_unlocked;
12737                 }
12738         }
12739         /* Ok, we will attempt a msgsnd :> */
12740         if (p) {
12741                 p->td_ru.ru_msgsnd++;
12742         }
12743         /* Are we aborting? */
12744         if (srcv->sinfo_flags & SCTP_ABORT) {
12745                 struct mbuf *mm;
12746                 int tot_demand, tot_out = 0, max_out;
12747
12748                 SCTP_STAT_INCR(sctps_sends_with_abort);
12749                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12750                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12751                         /* It has to be up before we abort */
12752                         /* how big is the user initiated abort? */
12753                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12754                         error = EINVAL;
12755                         goto out;
12756                 }
12757                 if (hold_tcblock) {
12758                         SCTP_TCB_UNLOCK(stcb);
12759                         hold_tcblock = 0;
12760                 }
12761                 if (top) {
12762                         struct mbuf *cntm = NULL;
12763
12764                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12765                         if (sndlen != 0) {
12766                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12767                                         tot_out += SCTP_BUF_LEN(cntm);
12768                                 }
12769                         }
12770                 } else {
12771                         /* Must fit in a MTU */
12772                         tot_out = sndlen;
12773                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12774                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12775                                 /* To big */
12776                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12777                                 error = EMSGSIZE;
12778                                 goto out;
12779                         }
12780                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12781                 }
12782                 if (mm == NULL) {
12783                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12784                         error = ENOMEM;
12785                         goto out;
12786                 }
12787                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12788                 max_out -= sizeof(struct sctp_abort_msg);
12789                 if (tot_out > max_out) {
12790                         tot_out = max_out;
12791                 }
12792                 if (mm) {
12793                         struct sctp_paramhdr *ph;
12794
12795                         /* now move forward the data pointer */
12796                         ph = mtod(mm, struct sctp_paramhdr *);
12797                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12798                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12799                         ph++;
12800                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12801                         if (top == NULL) {
12802                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12803                                 if (error) {
12804                                         /*-
12805                                          * Here if we can't get his data we
12806                                          * still abort we just don't get to
12807                                          * send the users note :-0
12808                                          */
12809                                         sctp_m_freem(mm);
12810                                         mm = NULL;
12811                                 }
12812                         } else {
12813                                 if (sndlen != 0) {
12814                                         SCTP_BUF_NEXT(mm) = top;
12815                                 }
12816                         }
12817                 }
12818                 if (hold_tcblock == 0) {
12819                         SCTP_TCB_LOCK(stcb);
12820                 }
12821                 atomic_add_int(&stcb->asoc.refcnt, -1);
12822                 free_cnt_applied = 0;
12823                 /* release this lock, otherwise we hang on ourselves */
12824                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12825                 /* now relock the stcb so everything is sane */
12826                 hold_tcblock = 0;
12827                 stcb = NULL;
12828                 /*
12829                  * In this case top is already chained to mm avoid double
12830                  * free, since we free it below if top != NULL and driver
12831                  * would free it after sending the packet out
12832                  */
12833                 if (sndlen != 0) {
12834                         top = NULL;
12835                 }
12836                 goto out_unlocked;
12837         }
12838         /* Calculate the maximum we can send */
12839         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12840         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12841                 if (non_blocking) {
12842                         /* we already checked for non-blocking above. */
12843                         max_len = sndlen;
12844                 } else {
12845                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12846                 }
12847         } else {
12848                 max_len = 0;
12849         }
12850         if (hold_tcblock) {
12851                 SCTP_TCB_UNLOCK(stcb);
12852                 hold_tcblock = 0;
12853         }
12854         if (asoc->strmout == NULL) {
12855                 /* huh? software error */
12856                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12857                 error = EFAULT;
12858                 goto out_unlocked;
12859         }
12860         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12861         if ((user_marks_eor == 0) &&
12862             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12863                 /* It will NEVER fit */
12864                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12865                 error = EMSGSIZE;
12866                 goto out_unlocked;
12867         }
12868         if ((uio == NULL) && user_marks_eor) {
12869                 /*-
12870                  * We do not support eeor mode for
12871                  * sending with mbuf chains (like sendfile).
12872                  */
12873                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12874                 error = EINVAL;
12875                 goto out_unlocked;
12876         }
12877         if (user_marks_eor) {
12878                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12879         } else {
12880                 /*-
12881                  * For non-eeor the whole message must fit in
12882                  * the socket send buffer.
12883                  */
12884                 local_add_more = sndlen;
12885         }
12886         len = 0;
12887         if (non_blocking) {
12888                 goto skip_preblock;
12889         }
12890         if (((max_len <= local_add_more) &&
12891             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12892             (max_len == 0) ||
12893             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12894                 /* No room right now ! */
12895                 SOCKBUF_LOCK(&so->so_snd);
12896                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12897                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12898                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12899                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12900                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12901                             inqueue_bytes,
12902                             local_add_more,
12903                             stcb->asoc.stream_queue_cnt,
12904                             stcb->asoc.chunks_on_out_queue,
12905                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12906                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12907                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12908                         }
12909                         be.error = 0;
12910                         stcb->block_entry = &be;
12911                         error = sbwait(&so->so_snd);
12912                         stcb->block_entry = NULL;
12913                         if (error || so->so_error || be.error) {
12914                                 if (error == 0) {
12915                                         if (so->so_error)
12916                                                 error = so->so_error;
12917                                         if (be.error) {
12918                                                 error = be.error;
12919                                         }
12920                                 }
12921                                 SOCKBUF_UNLOCK(&so->so_snd);
12922                                 goto out_unlocked;
12923                         }
12924                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12925                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12926                                     asoc, stcb->asoc.total_output_queue_size);
12927                         }
12928                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12929                                 goto out_unlocked;
12930                         }
12931                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12932                 }
12933                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12934                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12935                 } else {
12936                         max_len = 0;
12937                 }
12938                 SOCKBUF_UNLOCK(&so->so_snd);
12939         }
12940 skip_preblock:
12941         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12942                 goto out_unlocked;
12943         }
12944         /*
12945          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12946          * case NOTE: uio will be null when top/mbuf is passed
12947          */
12948         if (sndlen == 0) {
12949                 if (srcv->sinfo_flags & SCTP_EOF) {
12950                         got_all_of_the_send = 1;
12951                         goto dataless_eof;
12952                 } else {
12953                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12954                         error = EINVAL;
12955                         goto out;
12956                 }
12957         }
12958         if (top == NULL) {
12959                 struct sctp_stream_queue_pending *sp;
12960                 struct sctp_stream_out *strm;
12961                 uint32_t sndout;
12962
12963                 SCTP_TCB_SEND_LOCK(stcb);
12964                 if ((asoc->stream_locked) &&
12965                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12966                         SCTP_TCB_SEND_UNLOCK(stcb);
12967                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12968                         error = EINVAL;
12969                         goto out;
12970                 }
12971                 SCTP_TCB_SEND_UNLOCK(stcb);
12972
12973                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12974                 if (strm->last_msg_incomplete == 0) {
12975         do_a_copy_in:
12976                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12977                         if ((sp == NULL) || (error)) {
12978                                 goto out;
12979                         }
12980                         SCTP_TCB_SEND_LOCK(stcb);
12981                         if (sp->msg_is_complete) {
12982                                 strm->last_msg_incomplete = 0;
12983                                 asoc->stream_locked = 0;
12984                         } else {
12985                                 /*
12986                                  * Just got locked to this guy in case of an
12987                                  * interrupt.
12988                                  */
12989                                 strm->last_msg_incomplete = 1;
12990                                 asoc->stream_locked = 1;
12991                                 asoc->stream_locked_on = srcv->sinfo_stream;
12992                                 sp->sender_all_done = 0;
12993                         }
12994                         sctp_snd_sb_alloc(stcb, sp->length);
12995                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12996                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12997                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12998                         }
12999                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13000                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13001                         SCTP_TCB_SEND_UNLOCK(stcb);
13002                 } else {
13003                         SCTP_TCB_SEND_LOCK(stcb);
13004                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13005                         SCTP_TCB_SEND_UNLOCK(stcb);
13006                         if (sp == NULL) {
13007                                 /* ???? Huh ??? last msg is gone */
13008 #ifdef INVARIANTS
13009                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13010 #else
13011                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13012                                 strm->last_msg_incomplete = 0;
13013 #endif
13014                                 goto do_a_copy_in;
13015
13016                         }
13017                 }
13018                 while (uio->uio_resid > 0) {
13019                         /* How much room do we have? */
13020                         struct mbuf *new_tail, *mm;
13021
13022                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13023                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13024                         else
13025                                 max_len = 0;
13026
13027                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13028                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13029                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13030                                 sndout = 0;
13031                                 new_tail = NULL;
13032                                 if (hold_tcblock) {
13033                                         SCTP_TCB_UNLOCK(stcb);
13034                                         hold_tcblock = 0;
13035                                 }
13036                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13037                                 if ((mm == NULL) || error) {
13038                                         if (mm) {
13039                                                 sctp_m_freem(mm);
13040                                         }
13041                                         goto out;
13042                                 }
13043                                 /* Update the mbuf and count */
13044                                 SCTP_TCB_SEND_LOCK(stcb);
13045                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13046                                         /*
13047                                          * we need to get out. Peer probably
13048                                          * aborted.
13049                                          */
13050                                         sctp_m_freem(mm);
13051                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13052                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13053                                                 error = ECONNRESET;
13054                                         }
13055                                         SCTP_TCB_SEND_UNLOCK(stcb);
13056                                         goto out;
13057                                 }
13058                                 if (sp->tail_mbuf) {
13059                                         /* tack it to the end */
13060                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13061                                         sp->tail_mbuf = new_tail;
13062                                 } else {
13063                                         /* A stolen mbuf */
13064                                         sp->data = mm;
13065                                         sp->tail_mbuf = new_tail;
13066                                 }
13067                                 sctp_snd_sb_alloc(stcb, sndout);
13068                                 atomic_add_int(&sp->length, sndout);
13069                                 len += sndout;
13070
13071                                 /* Did we reach EOR? */
13072                                 if ((uio->uio_resid == 0) &&
13073                                     ((user_marks_eor == 0) ||
13074                                     (srcv->sinfo_flags & SCTP_EOF) ||
13075                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13076                                         sp->msg_is_complete = 1;
13077                                 } else {
13078                                         sp->msg_is_complete = 0;
13079                                 }
13080                                 SCTP_TCB_SEND_UNLOCK(stcb);
13081                         }
13082                         if (uio->uio_resid == 0) {
13083                                 /* got it all? */
13084                                 continue;
13085                         }
13086                         /* PR-SCTP? */
13087                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13088                                 /*
13089                                  * This is ugly but we must assure locking
13090                                  * order
13091                                  */
13092                                 if (hold_tcblock == 0) {
13093                                         SCTP_TCB_LOCK(stcb);
13094                                         hold_tcblock = 1;
13095                                 }
13096                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13097                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13098                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13099                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13100                                 else
13101                                         max_len = 0;
13102                                 if (max_len > 0) {
13103                                         continue;
13104                                 }
13105                                 SCTP_TCB_UNLOCK(stcb);
13106                                 hold_tcblock = 0;
13107                         }
13108                         /* wait for space now */
13109                         if (non_blocking) {
13110                                 /* Non-blocking io in place out */
13111                                 goto skip_out_eof;
13112                         }
13113                         /* What about the INIT, send it maybe */
13114                         if (queue_only_for_init) {
13115                                 if (hold_tcblock == 0) {
13116                                         SCTP_TCB_LOCK(stcb);
13117                                         hold_tcblock = 1;
13118                                 }
13119                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13120                                         /* a collision took us forward? */
13121                                         queue_only = 0;
13122                                 } else {
13123                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13124                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13125                                         queue_only = 1;
13126                                 }
13127                         }
13128                         if ((net->flight_size > net->cwnd) &&
13129                             (asoc->sctp_cmt_on_off == 0)) {
13130                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13131                                 queue_only = 1;
13132                         } else if (asoc->ifp_had_enobuf) {
13133                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13134                                 if (net->flight_size > (2 * net->mtu)) {
13135                                         queue_only = 1;
13136                                 }
13137                                 asoc->ifp_had_enobuf = 0;
13138                         }
13139                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13140                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13141                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13142                             (stcb->asoc.total_flight > 0) &&
13143                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13144                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13145
13146                                 /*-
13147                                  * Ok, Nagle is set on and we have data outstanding.
13148                                  * Don't send anything and let SACKs drive out the
13149                                  * data unless we have a "full" segment to send.
13150                                  */
13151                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13152                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13153                                 }
13154                                 SCTP_STAT_INCR(sctps_naglequeued);
13155                                 nagle_applies = 1;
13156                         } else {
13157                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13158                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13159                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13160                                 }
13161                                 SCTP_STAT_INCR(sctps_naglesent);
13162                                 nagle_applies = 0;
13163                         }
13164                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13165
13166                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13167                                     nagle_applies, un_sent);
13168                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13169                                     stcb->asoc.total_flight,
13170                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13171                         }
13172                         if (queue_only_for_init)
13173                                 queue_only_for_init = 0;
13174                         if ((queue_only == 0) && (nagle_applies == 0)) {
13175                                 /*-
13176                                  * need to start chunk output
13177                                  * before blocking.. note that if
13178                                  * a lock is already applied, then
13179                                  * the input via the net is happening
13180                                  * and I don't need to start output :-D
13181                                  */
13182                                 if (hold_tcblock == 0) {
13183                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13184                                                 hold_tcblock = 1;
13185                                                 sctp_chunk_output(inp,
13186                                                     stcb,
13187                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13188                                         }
13189                                 } else {
13190                                         sctp_chunk_output(inp,
13191                                             stcb,
13192                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13193                                 }
13194                                 if (hold_tcblock == 1) {
13195                                         SCTP_TCB_UNLOCK(stcb);
13196                                         hold_tcblock = 0;
13197                                 }
13198                         }
13199                         SOCKBUF_LOCK(&so->so_snd);
13200                         /*-
13201                          * This is a bit strange, but I think it will
13202                          * work. The total_output_queue_size is locked and
13203                          * protected by the TCB_LOCK, which we just released.
13204                          * There is a race that can occur between releasing it
13205                          * above, and me getting the socket lock, where sacks
13206                          * come in but we have not put the SB_WAIT on the
13207                          * so_snd buffer to get the wakeup. After the LOCK
13208                          * is applied the sack_processing will also need to
13209                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13210                          * once we have the socket buffer lock if we recheck the
13211                          * size we KNOW we will get to sleep safely with the
13212                          * wakeup flag in place.
13213                          */
13214                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13215                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13216                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13217                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13218                                             asoc, uio->uio_resid);
13219                                 }
13220                                 be.error = 0;
13221                                 stcb->block_entry = &be;
13222                                 error = sbwait(&so->so_snd);
13223                                 stcb->block_entry = NULL;
13224
13225                                 if (error || so->so_error || be.error) {
13226                                         if (error == 0) {
13227                                                 if (so->so_error)
13228                                                         error = so->so_error;
13229                                                 if (be.error) {
13230                                                         error = be.error;
13231                                                 }
13232                                         }
13233                                         SOCKBUF_UNLOCK(&so->so_snd);
13234                                         goto out_unlocked;
13235                                 }
13236                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13237                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13238                                             asoc, stcb->asoc.total_output_queue_size);
13239                                 }
13240                         }
13241                         SOCKBUF_UNLOCK(&so->so_snd);
13242                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13243                                 goto out_unlocked;
13244                         }
13245                 }
13246                 SCTP_TCB_SEND_LOCK(stcb);
13247                 if (sp) {
13248                         if (sp->msg_is_complete == 0) {
13249                                 strm->last_msg_incomplete = 1;
13250                                 asoc->stream_locked = 1;
13251                                 asoc->stream_locked_on = srcv->sinfo_stream;
13252                         } else {
13253                                 sp->sender_all_done = 1;
13254                                 strm->last_msg_incomplete = 0;
13255                                 asoc->stream_locked = 0;
13256                         }
13257                 } else {
13258                         SCTP_PRINTF("Huh no sp TSNH?\n");
13259                         strm->last_msg_incomplete = 0;
13260                         asoc->stream_locked = 0;
13261                 }
13262                 SCTP_TCB_SEND_UNLOCK(stcb);
13263                 if (uio->uio_resid == 0) {
13264                         got_all_of_the_send = 1;
13265                 }
13266         } else {
13267                 /* We send in a 0, since we do NOT have any locks */
13268                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13269                 top = NULL;
13270                 if (srcv->sinfo_flags & SCTP_EOF) {
13271                         /*
13272                          * This should only happen for Panda for the mbuf
13273                          * send case, which does NOT yet support EEOR mode.
13274                          * Thus, we can just set this flag to do the proper
13275                          * EOF handling.
13276                          */
13277                         got_all_of_the_send = 1;
13278                 }
13279         }
13280         if (error) {
13281                 goto out;
13282         }
13283 dataless_eof:
13284         /* EOF thing ? */
13285         if ((srcv->sinfo_flags & SCTP_EOF) &&
13286             (got_all_of_the_send == 1)) {
13287                 int cnt;
13288
13289                 SCTP_STAT_INCR(sctps_sends_with_eof);
13290                 error = 0;
13291                 if (hold_tcblock == 0) {
13292                         SCTP_TCB_LOCK(stcb);
13293                         hold_tcblock = 1;
13294                 }
13295                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13296                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13297                     TAILQ_EMPTY(&asoc->sent_queue) &&
13298                     (cnt == 0)) {
13299                         if (asoc->locked_on_sending) {
13300                                 goto abort_anyway;
13301                         }
13302                         /* there is nothing queued to send, so I'm done... */
13303                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13304                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13305                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13306                                 struct sctp_nets *netp;
13307
13308                                 /* only send SHUTDOWN the first time through */
13309                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13310                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13311                                 }
13312                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13313                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13314                                 sctp_stop_timers_for_shutdown(stcb);
13315                                 if (stcb->asoc.alternate) {
13316                                         netp = stcb->asoc.alternate;
13317                                 } else {
13318                                         netp = stcb->asoc.primary_destination;
13319                                 }
13320                                 sctp_send_shutdown(stcb, netp);
13321                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13322                                     netp);
13323                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13324                                     asoc->primary_destination);
13325                         }
13326                 } else {
13327                         /*-
13328                          * we still got (or just got) data to send, so set
13329                          * SHUTDOWN_PENDING
13330                          */
13331                         /*-
13332                          * XXX sockets draft says that SCTP_EOF should be
13333                          * sent with no data.  currently, we will allow user
13334                          * data to be sent first and move to
13335                          * SHUTDOWN-PENDING
13336                          */
13337                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13338                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13339                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13340                                 if (hold_tcblock == 0) {
13341                                         SCTP_TCB_LOCK(stcb);
13342                                         hold_tcblock = 1;
13343                                 }
13344                                 if (asoc->locked_on_sending) {
13345                                         /* Locked to send out the data */
13346                                         struct sctp_stream_queue_pending *sp;
13347
13348                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13349                                         if (sp) {
13350                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13351                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13352                                         }
13353                                 }
13354                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13355                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13356                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13357                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13358                                         struct mbuf *op_err;
13359                                         char msg[SCTP_DIAG_INFO_LEN];
13360
13361                         abort_anyway:
13362                                         if (free_cnt_applied) {
13363                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13364                                                 free_cnt_applied = 0;
13365                                         }
13366                                         snprintf(msg, sizeof(msg),
13367                                             "%s:%d at %s", __FILE__, __LINE__, __FUNCTION__);
13368                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13369                                             msg);
13370                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13371                                             op_err, SCTP_SO_LOCKED);
13372                                         /*
13373                                          * now relock the stcb so everything
13374                                          * is sane
13375                                          */
13376                                         hold_tcblock = 0;
13377                                         stcb = NULL;
13378                                         goto out;
13379                                 }
13380                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13381                                     asoc->primary_destination);
13382                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13383                         }
13384                 }
13385         }
13386 skip_out_eof:
13387         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13388                 some_on_control = 1;
13389         }
13390         if (queue_only_for_init) {
13391                 if (hold_tcblock == 0) {
13392                         SCTP_TCB_LOCK(stcb);
13393                         hold_tcblock = 1;
13394                 }
13395                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13396                         /* a collision took us forward? */
13397                         queue_only = 0;
13398                 } else {
13399                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13400                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13401                         queue_only = 1;
13402                 }
13403         }
13404         if ((net->flight_size > net->cwnd) &&
13405             (stcb->asoc.sctp_cmt_on_off == 0)) {
13406                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13407                 queue_only = 1;
13408         } else if (asoc->ifp_had_enobuf) {
13409                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13410                 if (net->flight_size > (2 * net->mtu)) {
13411                         queue_only = 1;
13412                 }
13413                 asoc->ifp_had_enobuf = 0;
13414         }
13415         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13416             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13417         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13418             (stcb->asoc.total_flight > 0) &&
13419             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13420             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13421                 /*-
13422                  * Ok, Nagle is set on and we have data outstanding.
13423                  * Don't send anything and let SACKs drive out the
13424                  * data unless wen have a "full" segment to send.
13425                  */
13426                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13427                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13428                 }
13429                 SCTP_STAT_INCR(sctps_naglequeued);
13430                 nagle_applies = 1;
13431         } else {
13432                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13433                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13434                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13435                 }
13436                 SCTP_STAT_INCR(sctps_naglesent);
13437                 nagle_applies = 0;
13438         }
13439         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13440                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13441                     nagle_applies, un_sent);
13442                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13443                     stcb->asoc.total_flight,
13444                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13445         }
13446         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13447                 /* we can attempt to send too. */
13448                 if (hold_tcblock == 0) {
13449                         /*
13450                          * If there is activity recv'ing sacks no need to
13451                          * send
13452                          */
13453                         if (SCTP_TCB_TRYLOCK(stcb)) {
13454                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13455                                 hold_tcblock = 1;
13456                         }
13457                 } else {
13458                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13459                 }
13460         } else if ((queue_only == 0) &&
13461                     (stcb->asoc.peers_rwnd == 0) &&
13462             (stcb->asoc.total_flight == 0)) {
13463                 /* We get to have a probe outstanding */
13464                 if (hold_tcblock == 0) {
13465                         hold_tcblock = 1;
13466                         SCTP_TCB_LOCK(stcb);
13467                 }
13468                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13469         } else if (some_on_control) {
13470                 int num_out, reason, frag_point;
13471
13472                 /* Here we do control only */
13473                 if (hold_tcblock == 0) {
13474                         hold_tcblock = 1;
13475                         SCTP_TCB_LOCK(stcb);
13476                 }
13477                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13478                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13479                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13480         }
13481         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13482             queue_only, stcb->asoc.peers_rwnd, un_sent,
13483             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13484             stcb->asoc.total_output_queue_size, error);
13485
13486 out:
13487 out_unlocked:
13488
13489         if (local_soresv && stcb) {
13490                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13491         }
13492         if (create_lock_applied) {
13493                 SCTP_ASOC_CREATE_UNLOCK(inp);
13494         }
13495         if ((stcb) && hold_tcblock) {
13496                 SCTP_TCB_UNLOCK(stcb);
13497         }
13498         if (stcb && free_cnt_applied) {
13499                 atomic_add_int(&stcb->asoc.refcnt, -1);
13500         }
13501 #ifdef INVARIANTS
13502         if (stcb) {
13503                 if (mtx_owned(&stcb->tcb_mtx)) {
13504                         panic("Leaving with tcb mtx owned?");
13505                 }
13506                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13507                         panic("Leaving with tcb send mtx owned?");
13508                 }
13509         }
13510 #endif
13511 #ifdef INVARIANTS
13512         if (inp) {
13513                 sctp_validate_no_locks(inp);
13514         } else {
13515                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13516         }
13517 #endif
13518         if (top) {
13519                 sctp_m_freem(top);
13520         }
13521         if (control) {
13522                 sctp_m_freem(control);
13523         }
13524         return (error);
13525 }
13526
13527
13528 /*
13529  * generate an AUTHentication chunk, if required
13530  */
13531 struct mbuf *
13532 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13533     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13534     struct sctp_tcb *stcb, uint8_t chunk)
13535 {
13536         struct mbuf *m_auth;
13537         struct sctp_auth_chunk *auth;
13538         int chunk_len;
13539         struct mbuf *cn;
13540
13541         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13542             (stcb == NULL))
13543                 return (m);
13544
13545         if (stcb->asoc.auth_supported == 0) {
13546                 return (m);
13547         }
13548         /* does the requested chunk require auth? */
13549         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13550                 return (m);
13551         }
13552         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13553         if (m_auth == NULL) {
13554                 /* no mbuf's */
13555                 return (m);
13556         }
13557         /* reserve some space if this will be the first mbuf */
13558         if (m == NULL)
13559                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13560         /* fill in the AUTH chunk details */
13561         auth = mtod(m_auth, struct sctp_auth_chunk *);
13562         bzero(auth, sizeof(*auth));
13563         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13564         auth->ch.chunk_flags = 0;
13565         chunk_len = sizeof(*auth) +
13566             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13567         auth->ch.chunk_length = htons(chunk_len);
13568         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13569         /* key id and hmac digest will be computed and filled in upon send */
13570
13571         /* save the offset where the auth was inserted into the chain */
13572         *offset = 0;
13573         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13574                 *offset += SCTP_BUF_LEN(cn);
13575         }
13576
13577         /* update length and return pointer to the auth chunk */
13578         SCTP_BUF_LEN(m_auth) = chunk_len;
13579         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13580         if (auth_ret != NULL)
13581                 *auth_ret = auth;
13582
13583         return (m);
13584 }
13585
13586 #ifdef INET6
13587 int
13588 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13589 {
13590         struct nd_prefix *pfx = NULL;
13591         struct nd_pfxrouter *pfxrtr = NULL;
13592         struct sockaddr_in6 gw6;
13593
13594         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13595                 return (0);
13596
13597         /* get prefix entry of address */
13598         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13599                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13600                         continue;
13601                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13602                     &src6->sin6_addr, &pfx->ndpr_mask))
13603                         break;
13604         }
13605         /* no prefix entry in the prefix list */
13606         if (pfx == NULL) {
13607                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13608                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13609                 return (0);
13610         }
13611         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13612         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13613
13614         /* search installed gateway from prefix entry */
13615         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13616                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13617                 gw6.sin6_family = AF_INET6;
13618                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13619                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13620                     sizeof(struct in6_addr));
13621                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13622                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13623                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13624                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13625                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13626                     ro->ro_rt->rt_gateway)) {
13627                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13628                         return (1);
13629                 }
13630         }
13631         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13632         return (0);
13633 }
13634
13635 #endif
13636
13637 int
13638 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13639 {
13640 #ifdef INET
13641         struct sockaddr_in *sin, *mask;
13642         struct ifaddr *ifa;
13643         struct in_addr srcnetaddr, gwnetaddr;
13644
13645         if (ro == NULL || ro->ro_rt == NULL ||
13646             sifa->address.sa.sa_family != AF_INET) {
13647                 return (0);
13648         }
13649         ifa = (struct ifaddr *)sifa->ifa;
13650         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13651         sin = &sifa->address.sin;
13652         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13653         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13654         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13655         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13656
13657         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13658         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13659         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13660         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13661         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13662         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13663                 return (1);
13664         }
13665 #endif
13666         return (0);
13667 }