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->ip_id = ip_newid();
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\n", __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                                 abort_anyway:
6686                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6687                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6688                                                     NULL, SCTP_SO_NOT_LOCKED);
6689                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6690                                                 goto no_chunk_output;
6691                                         }
6692                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6693                                             asoc->primary_destination);
6694                                 }
6695                         }
6696
6697                 }
6698         }
6699         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6700             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6701
6702         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6703             (stcb->asoc.total_flight > 0) &&
6704             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6705                 do_chunk_output = 0;
6706         }
6707         if (do_chunk_output)
6708                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6709         else if (added_control) {
6710                 int num_out, reason, now_filled = 0;
6711                 struct timeval now;
6712                 int frag_point;
6713
6714                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6715                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6716                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6717         }
6718 no_chunk_output:
6719         if (ret) {
6720                 ca->cnt_failed++;
6721         } else {
6722                 ca->cnt_sent++;
6723         }
6724 }
6725
6726 static void
6727 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6728 {
6729         struct sctp_copy_all *ca;
6730
6731         ca = (struct sctp_copy_all *)ptr;
6732         /*
6733          * Do a notify here? Kacheong suggests that the notify be done at
6734          * the send time.. so you would push up a notification if any send
6735          * failed. Don't know if this is feasable since the only failures we
6736          * have is "memory" related and if you cannot get an mbuf to send
6737          * the data you surely can't get an mbuf to send up to notify the
6738          * user you can't send the data :->
6739          */
6740
6741         /* now free everything */
6742         sctp_m_freem(ca->m);
6743         SCTP_FREE(ca, SCTP_M_COPYAL);
6744 }
6745
6746 static struct mbuf *
6747 sctp_copy_out_all(struct uio *uio, int len)
6748 {
6749         struct mbuf *ret, *at;
6750         int left, willcpy, cancpy, error;
6751
6752         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6753         if (ret == NULL) {
6754                 /* TSNH */
6755                 return (NULL);
6756         }
6757         left = len;
6758         SCTP_BUF_LEN(ret) = 0;
6759         /* save space for the data chunk header */
6760         cancpy = M_TRAILINGSPACE(ret);
6761         willcpy = min(cancpy, left);
6762         at = ret;
6763         while (left > 0) {
6764                 /* Align data to the end */
6765                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6766                 if (error) {
6767         err_out_now:
6768                         sctp_m_freem(at);
6769                         return (NULL);
6770                 }
6771                 SCTP_BUF_LEN(at) = willcpy;
6772                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6773                 left -= willcpy;
6774                 if (left > 0) {
6775                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6776                         if (SCTP_BUF_NEXT(at) == NULL) {
6777                                 goto err_out_now;
6778                         }
6779                         at = SCTP_BUF_NEXT(at);
6780                         SCTP_BUF_LEN(at) = 0;
6781                         cancpy = M_TRAILINGSPACE(at);
6782                         willcpy = min(cancpy, left);
6783                 }
6784         }
6785         return (ret);
6786 }
6787
6788 static int
6789 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6790     struct sctp_sndrcvinfo *srcv)
6791 {
6792         int ret;
6793         struct sctp_copy_all *ca;
6794
6795         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6796             SCTP_M_COPYAL);
6797         if (ca == NULL) {
6798                 sctp_m_freem(m);
6799                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6800                 return (ENOMEM);
6801         }
6802         memset(ca, 0, sizeof(struct sctp_copy_all));
6803
6804         ca->inp = inp;
6805         if (srcv) {
6806                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6807         }
6808         /*
6809          * take off the sendall flag, it would be bad if we failed to do
6810          * this :-0
6811          */
6812         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6813         /* get length and mbuf chain */
6814         if (uio) {
6815                 ca->sndlen = uio->uio_resid;
6816                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6817                 if (ca->m == NULL) {
6818                         SCTP_FREE(ca, SCTP_M_COPYAL);
6819                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6820                         return (ENOMEM);
6821                 }
6822         } else {
6823                 /* Gather the length of the send */
6824                 struct mbuf *mat;
6825
6826                 ca->sndlen = 0;
6827                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6828                         ca->sndlen += SCTP_BUF_LEN(mat);
6829                 }
6830         }
6831         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6832             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6833             SCTP_ASOC_ANY_STATE,
6834             (void *)ca, 0,
6835             sctp_sendall_completes, inp, 1);
6836         if (ret) {
6837                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6838                 SCTP_FREE(ca, SCTP_M_COPYAL);
6839                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6840                 return (EFAULT);
6841         }
6842         return (0);
6843 }
6844
6845
6846 void
6847 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6848 {
6849         struct sctp_tmit_chunk *chk, *nchk;
6850
6851         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6852                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6853                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6854                         if (chk->data) {
6855                                 sctp_m_freem(chk->data);
6856                                 chk->data = NULL;
6857                         }
6858                         asoc->ctrl_queue_cnt--;
6859                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6860                 }
6861         }
6862 }
6863
6864 void
6865 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6866 {
6867         struct sctp_association *asoc;
6868         struct sctp_tmit_chunk *chk, *nchk;
6869         struct sctp_asconf_chunk *acp;
6870
6871         asoc = &stcb->asoc;
6872         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6873                 /* find SCTP_ASCONF chunk in queue */
6874                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6875                         if (chk->data) {
6876                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6877                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6878                                         /* Not Acked yet */
6879                                         break;
6880                                 }
6881                         }
6882                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6883                         if (chk->data) {
6884                                 sctp_m_freem(chk->data);
6885                                 chk->data = NULL;
6886                         }
6887                         asoc->ctrl_queue_cnt--;
6888                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6889                 }
6890         }
6891 }
6892
6893
6894 static void
6895 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6896     struct sctp_association *asoc,
6897     struct sctp_tmit_chunk **data_list,
6898     int bundle_at,
6899     struct sctp_nets *net)
6900 {
6901         int i;
6902         struct sctp_tmit_chunk *tp1;
6903
6904         for (i = 0; i < bundle_at; i++) {
6905                 /* off of the send queue */
6906                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6907                 asoc->send_queue_cnt--;
6908                 if (i > 0) {
6909                         /*
6910                          * Any chunk NOT 0 you zap the time chunk 0 gets
6911                          * zapped or set based on if a RTO measurment is
6912                          * needed.
6913                          */
6914                         data_list[i]->do_rtt = 0;
6915                 }
6916                 /* record time */
6917                 data_list[i]->sent_rcv_time = net->last_sent_time;
6918                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6919                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6920                 if (data_list[i]->whoTo == NULL) {
6921                         data_list[i]->whoTo = net;
6922                         atomic_add_int(&net->ref_count, 1);
6923                 }
6924                 /* on to the sent queue */
6925                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6926                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6927                         struct sctp_tmit_chunk *tpp;
6928
6929                         /* need to move back */
6930         back_up_more:
6931                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6932                         if (tpp == NULL) {
6933                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6934                                 goto all_done;
6935                         }
6936                         tp1 = tpp;
6937                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6938                                 goto back_up_more;
6939                         }
6940                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6941                 } else {
6942                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6943                             data_list[i],
6944                             sctp_next);
6945                 }
6946 all_done:
6947                 /* This does not lower until the cum-ack passes it */
6948                 asoc->sent_queue_cnt++;
6949                 if ((asoc->peers_rwnd <= 0) &&
6950                     (asoc->total_flight == 0) &&
6951                     (bundle_at == 1)) {
6952                         /* Mark the chunk as being a window probe */
6953                         SCTP_STAT_INCR(sctps_windowprobed);
6954                 }
6955 #ifdef SCTP_AUDITING_ENABLED
6956                 sctp_audit_log(0xC2, 3);
6957 #endif
6958                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6959                 data_list[i]->snd_count = 1;
6960                 data_list[i]->rec.data.chunk_was_revoked = 0;
6961                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6962                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6963                             data_list[i]->whoTo->flight_size,
6964                             data_list[i]->book_size,
6965                             (uintptr_t) data_list[i]->whoTo,
6966                             data_list[i]->rec.data.TSN_seq);
6967                 }
6968                 sctp_flight_size_increase(data_list[i]);
6969                 sctp_total_flight_increase(stcb, data_list[i]);
6970                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6971                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6972                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6973                 }
6974                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6975                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6976                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6977                         /* SWS sender side engages */
6978                         asoc->peers_rwnd = 0;
6979                 }
6980         }
6981         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6982                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6983         }
6984 }
6985
6986 static void
6987 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6988 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6989     SCTP_UNUSED
6990 #endif
6991 )
6992 {
6993         struct sctp_tmit_chunk *chk, *nchk;
6994
6995         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6996                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6997                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6998                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6999                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7000                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7001                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7002                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7003                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7004                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7005                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7006                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7007                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7008                         /* Stray chunks must be cleaned up */
7009         clean_up_anyway:
7010                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7011                         if (chk->data) {
7012                                 sctp_m_freem(chk->data);
7013                                 chk->data = NULL;
7014                         }
7015                         asoc->ctrl_queue_cnt--;
7016                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7017                                 asoc->fwd_tsn_cnt--;
7018                         sctp_free_a_chunk(stcb, chk, so_locked);
7019                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7020                         /* special handling, we must look into the param */
7021                         if (chk != asoc->str_reset) {
7022                                 goto clean_up_anyway;
7023                         }
7024                 }
7025         }
7026 }
7027
7028
7029 static int
7030 sctp_can_we_split_this(struct sctp_tcb *stcb,
7031     uint32_t length,
7032     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7033 {
7034         /*
7035          * Make a decision on if I should split a msg into multiple parts.
7036          * This is only asked of incomplete messages.
7037          */
7038         if (eeor_on) {
7039                 /*
7040                  * If we are doing EEOR we need to always send it if its the
7041                  * entire thing, since it might be all the guy is putting in
7042                  * the hopper.
7043                  */
7044                 if (goal_mtu >= length) {
7045                         /*-
7046                          * If we have data outstanding,
7047                          * we get another chance when the sack
7048                          * arrives to transmit - wait for more data
7049                          */
7050                         if (stcb->asoc.total_flight == 0) {
7051                                 /*
7052                                  * If nothing is in flight, we zero the
7053                                  * packet counter.
7054                                  */
7055                                 return (length);
7056                         }
7057                         return (0);
7058
7059                 } else {
7060                         /* You can fill the rest */
7061                         return (goal_mtu);
7062                 }
7063         }
7064         /*-
7065          * For those strange folk that make the send buffer
7066          * smaller than our fragmentation point, we can't
7067          * get a full msg in so we have to allow splitting.
7068          */
7069         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7070                 return (length);
7071         }
7072         if ((length <= goal_mtu) ||
7073             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7074                 /* Sub-optimial residual don't split in non-eeor mode. */
7075                 return (0);
7076         }
7077         /*
7078          * If we reach here length is larger than the goal_mtu. Do we wish
7079          * to split it for the sake of packet putting together?
7080          */
7081         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7082                 /* Its ok to split it */
7083                 return (min(goal_mtu, frag_point));
7084         }
7085         /* Nope, can't split */
7086         return (0);
7087
7088 }
7089
7090 static uint32_t
7091 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7092     struct sctp_stream_out *strq,
7093     uint32_t goal_mtu,
7094     uint32_t frag_point,
7095     int *locked,
7096     int *giveup,
7097     int eeor_mode,
7098     int *bail,
7099     int so_locked
7100 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7101     SCTP_UNUSED
7102 #endif
7103 )
7104 {
7105         /* Move from the stream to the send_queue keeping track of the total */
7106         struct sctp_association *asoc;
7107         struct sctp_stream_queue_pending *sp;
7108         struct sctp_tmit_chunk *chk;
7109         struct sctp_data_chunk *dchkh;
7110         uint32_t to_move, length;
7111         uint8_t rcv_flags = 0;
7112         uint8_t some_taken;
7113         uint8_t send_lock_up = 0;
7114
7115         SCTP_TCB_LOCK_ASSERT(stcb);
7116         asoc = &stcb->asoc;
7117 one_more_time:
7118         /* sa_ignore FREED_MEMORY */
7119         sp = TAILQ_FIRST(&strq->outqueue);
7120         if (sp == NULL) {
7121                 *locked = 0;
7122                 if (send_lock_up == 0) {
7123                         SCTP_TCB_SEND_LOCK(stcb);
7124                         send_lock_up = 1;
7125                 }
7126                 sp = TAILQ_FIRST(&strq->outqueue);
7127                 if (sp) {
7128                         goto one_more_time;
7129                 }
7130                 if (strq->last_msg_incomplete) {
7131                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7132                             strq->stream_no,
7133                             strq->last_msg_incomplete);
7134                         strq->last_msg_incomplete = 0;
7135                 }
7136                 to_move = 0;
7137                 if (send_lock_up) {
7138                         SCTP_TCB_SEND_UNLOCK(stcb);
7139                         send_lock_up = 0;
7140                 }
7141                 goto out_of;
7142         }
7143         if ((sp->msg_is_complete) && (sp->length == 0)) {
7144                 if (sp->sender_all_done) {
7145                         /*
7146                          * We are doing differed cleanup. Last time through
7147                          * when we took all the data the sender_all_done was
7148                          * not set.
7149                          */
7150                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7151                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7152                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7153                                     sp->sender_all_done,
7154                                     sp->length,
7155                                     sp->msg_is_complete,
7156                                     sp->put_last_out,
7157                                     send_lock_up);
7158                         }
7159                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7160                                 SCTP_TCB_SEND_LOCK(stcb);
7161                                 send_lock_up = 1;
7162                         }
7163                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7164                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7165                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7166                         if (sp->net) {
7167                                 sctp_free_remote_addr(sp->net);
7168                                 sp->net = NULL;
7169                         }
7170                         if (sp->data) {
7171                                 sctp_m_freem(sp->data);
7172                                 sp->data = NULL;
7173                         }
7174                         sctp_free_a_strmoq(stcb, sp, so_locked);
7175                         /* we can't be locked to it */
7176                         *locked = 0;
7177                         stcb->asoc.locked_on_sending = NULL;
7178                         if (send_lock_up) {
7179                                 SCTP_TCB_SEND_UNLOCK(stcb);
7180                                 send_lock_up = 0;
7181                         }
7182                         /* back to get the next msg */
7183                         goto one_more_time;
7184                 } else {
7185                         /*
7186                          * sender just finished this but still holds a
7187                          * reference
7188                          */
7189                         *locked = 1;
7190                         *giveup = 1;
7191                         to_move = 0;
7192                         goto out_of;
7193                 }
7194         } else {
7195                 /* is there some to get */
7196                 if (sp->length == 0) {
7197                         /* no */
7198                         *locked = 1;
7199                         *giveup = 1;
7200                         to_move = 0;
7201                         goto out_of;
7202                 } else if (sp->discard_rest) {
7203                         if (send_lock_up == 0) {
7204                                 SCTP_TCB_SEND_LOCK(stcb);
7205                                 send_lock_up = 1;
7206                         }
7207                         /* Whack down the size */
7208                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7209                         if ((stcb->sctp_socket != NULL) && \
7210                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7211                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7212                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7213                         }
7214                         if (sp->data) {
7215                                 sctp_m_freem(sp->data);
7216                                 sp->data = NULL;
7217                                 sp->tail_mbuf = NULL;
7218                         }
7219                         sp->length = 0;
7220                         sp->some_taken = 1;
7221                         *locked = 1;
7222                         *giveup = 1;
7223                         to_move = 0;
7224                         goto out_of;
7225                 }
7226         }
7227         some_taken = sp->some_taken;
7228         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7229                 sp->msg_is_complete = 1;
7230         }
7231 re_look:
7232         length = sp->length;
7233         if (sp->msg_is_complete) {
7234                 /* The message is complete */
7235                 to_move = min(length, frag_point);
7236                 if (to_move == length) {
7237                         /* All of it fits in the MTU */
7238                         if (sp->some_taken) {
7239                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7240                                 sp->put_last_out = 1;
7241                         } else {
7242                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7243                                 sp->put_last_out = 1;
7244                         }
7245                 } else {
7246                         /* Not all of it fits, we fragment */
7247                         if (sp->some_taken == 0) {
7248                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7249                         }
7250                         sp->some_taken = 1;
7251                 }
7252         } else {
7253                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7254                 if (to_move) {
7255                         /*-
7256                          * We use a snapshot of length in case it
7257                          * is expanding during the compare.
7258                          */
7259                         uint32_t llen;
7260
7261                         llen = length;
7262                         if (to_move >= llen) {
7263                                 to_move = llen;
7264                                 if (send_lock_up == 0) {
7265                                         /*-
7266                                          * We are taking all of an incomplete msg
7267                                          * thus we need a send lock.
7268                                          */
7269                                         SCTP_TCB_SEND_LOCK(stcb);
7270                                         send_lock_up = 1;
7271                                         if (sp->msg_is_complete) {
7272                                                 /*
7273                                                  * the sender finished the
7274                                                  * msg
7275                                                  */
7276                                                 goto re_look;
7277                                         }
7278                                 }
7279                         }
7280                         if (sp->some_taken == 0) {
7281                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7282                                 sp->some_taken = 1;
7283                         }
7284                 } else {
7285                         /* Nothing to take. */
7286                         if (sp->some_taken) {
7287                                 *locked = 1;
7288                         }
7289                         *giveup = 1;
7290                         to_move = 0;
7291                         goto out_of;
7292                 }
7293         }
7294
7295         /* If we reach here, we can copy out a chunk */
7296         sctp_alloc_a_chunk(stcb, chk);
7297         if (chk == NULL) {
7298                 /* No chunk memory */
7299                 *giveup = 1;
7300                 to_move = 0;
7301                 goto out_of;
7302         }
7303         /*
7304          * Setup for unordered if needed by looking at the user sent info
7305          * flags.
7306          */
7307         if (sp->sinfo_flags & SCTP_UNORDERED) {
7308                 rcv_flags |= SCTP_DATA_UNORDERED;
7309         }
7310         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7311             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7312                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7313         }
7314         /* clear out the chunk before setting up */
7315         memset(chk, 0, sizeof(*chk));
7316         chk->rec.data.rcv_flags = rcv_flags;
7317
7318         if (to_move >= length) {
7319                 /* we think we can steal the whole thing */
7320                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7321                         SCTP_TCB_SEND_LOCK(stcb);
7322                         send_lock_up = 1;
7323                 }
7324                 if (to_move < sp->length) {
7325                         /* bail, it changed */
7326                         goto dont_do_it;
7327                 }
7328                 chk->data = sp->data;
7329                 chk->last_mbuf = sp->tail_mbuf;
7330                 /* register the stealing */
7331                 sp->data = sp->tail_mbuf = NULL;
7332         } else {
7333                 struct mbuf *m;
7334
7335 dont_do_it:
7336                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7337                 chk->last_mbuf = NULL;
7338                 if (chk->data == NULL) {
7339                         sp->some_taken = some_taken;
7340                         sctp_free_a_chunk(stcb, chk, so_locked);
7341                         *bail = 1;
7342                         to_move = 0;
7343                         goto out_of;
7344                 }
7345 #ifdef SCTP_MBUF_LOGGING
7346                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7347                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7348                 }
7349 #endif
7350                 /* Pull off the data */
7351                 m_adj(sp->data, to_move);
7352                 /* Now lets work our way down and compact it */
7353                 m = sp->data;
7354                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7355                         sp->data = SCTP_BUF_NEXT(m);
7356                         SCTP_BUF_NEXT(m) = NULL;
7357                         if (sp->tail_mbuf == m) {
7358                                 /*-
7359                                  * Freeing tail? TSNH since
7360                                  * we supposedly were taking less
7361                                  * than the sp->length.
7362                                  */
7363 #ifdef INVARIANTS
7364                                 panic("Huh, freing tail? - TSNH");
7365 #else
7366                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7367                                 sp->tail_mbuf = sp->data = NULL;
7368                                 sp->length = 0;
7369 #endif
7370
7371                         }
7372                         sctp_m_free(m);
7373                         m = sp->data;
7374                 }
7375         }
7376         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7377                 chk->copy_by_ref = 1;
7378         } else {
7379                 chk->copy_by_ref = 0;
7380         }
7381         /*
7382          * get last_mbuf and counts of mb useage This is ugly but hopefully
7383          * its only one mbuf.
7384          */
7385         if (chk->last_mbuf == NULL) {
7386                 chk->last_mbuf = chk->data;
7387                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7388                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7389                 }
7390         }
7391         if (to_move > length) {
7392                 /*- This should not happen either
7393                  * since we always lower to_move to the size
7394                  * of sp->length if its larger.
7395                  */
7396 #ifdef INVARIANTS
7397                 panic("Huh, how can to_move be larger?");
7398 #else
7399                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7400                 sp->length = 0;
7401 #endif
7402         } else {
7403                 atomic_subtract_int(&sp->length, to_move);
7404         }
7405         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7406                 /* Not enough room for a chunk header, get some */
7407                 struct mbuf *m;
7408
7409                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7410                 if (m == NULL) {
7411                         /*
7412                          * we're in trouble here. _PREPEND below will free
7413                          * all the data if there is no leading space, so we
7414                          * must put the data back and restore.
7415                          */
7416                         if (send_lock_up == 0) {
7417                                 SCTP_TCB_SEND_LOCK(stcb);
7418                                 send_lock_up = 1;
7419                         }
7420                         if (sp->data == NULL) {
7421                                 /* unsteal the data */
7422                                 sp->data = chk->data;
7423                                 sp->tail_mbuf = chk->last_mbuf;
7424                         } else {
7425                                 struct mbuf *m_tmp;
7426
7427                                 /* reassemble the data */
7428                                 m_tmp = sp->data;
7429                                 sp->data = chk->data;
7430                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7431                         }
7432                         sp->some_taken = some_taken;
7433                         atomic_add_int(&sp->length, to_move);
7434                         chk->data = NULL;
7435                         *bail = 1;
7436                         sctp_free_a_chunk(stcb, chk, so_locked);
7437                         to_move = 0;
7438                         goto out_of;
7439                 } else {
7440                         SCTP_BUF_LEN(m) = 0;
7441                         SCTP_BUF_NEXT(m) = chk->data;
7442                         chk->data = m;
7443                         M_ALIGN(chk->data, 4);
7444                 }
7445         }
7446         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7447         if (chk->data == NULL) {
7448                 /* HELP, TSNH since we assured it would not above? */
7449 #ifdef INVARIANTS
7450                 panic("prepend failes HELP?");
7451 #else
7452                 SCTP_PRINTF("prepend fails HELP?\n");
7453                 sctp_free_a_chunk(stcb, chk, so_locked);
7454 #endif
7455                 *bail = 1;
7456                 to_move = 0;
7457                 goto out_of;
7458         }
7459         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7460         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7461         chk->book_size_scale = 0;
7462         chk->sent = SCTP_DATAGRAM_UNSENT;
7463
7464         chk->flags = 0;
7465         chk->asoc = &stcb->asoc;
7466         chk->pad_inplace = 0;
7467         chk->no_fr_allowed = 0;
7468         chk->rec.data.stream_seq = strq->next_sequence_send;
7469         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7470             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7471                 strq->next_sequence_send++;
7472         }
7473         chk->rec.data.stream_number = sp->stream;
7474         chk->rec.data.payloadtype = sp->ppid;
7475         chk->rec.data.context = sp->context;
7476         chk->rec.data.doing_fast_retransmit = 0;
7477
7478         chk->rec.data.timetodrop = sp->ts;
7479         chk->flags = sp->act_flags;
7480
7481         if (sp->net) {
7482                 chk->whoTo = sp->net;
7483                 atomic_add_int(&chk->whoTo->ref_count, 1);
7484         } else
7485                 chk->whoTo = NULL;
7486
7487         if (sp->holds_key_ref) {
7488                 chk->auth_keyid = sp->auth_keyid;
7489                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7490                 chk->holds_key_ref = 1;
7491         }
7492         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7493         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7494                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7495                     (uintptr_t) stcb, sp->length,
7496                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7497                     chk->rec.data.TSN_seq);
7498         }
7499         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7500         /*
7501          * Put the rest of the things in place now. Size was done earlier in
7502          * previous loop prior to padding.
7503          */
7504
7505 #ifdef SCTP_ASOCLOG_OF_TSNS
7506         SCTP_TCB_LOCK_ASSERT(stcb);
7507         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7508                 asoc->tsn_out_at = 0;
7509                 asoc->tsn_out_wrapped = 1;
7510         }
7511         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7512         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7513         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7514         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7515         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7516         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7517         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7518         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7519         asoc->tsn_out_at++;
7520 #endif
7521
7522         dchkh->ch.chunk_type = SCTP_DATA;
7523         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7524         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7525         dchkh->dp.stream_id = htons(strq->stream_no);
7526         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7527         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7528         dchkh->ch.chunk_length = htons(chk->send_size);
7529         /* Now advance the chk->send_size by the actual pad needed. */
7530         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7531                 /* need a pad */
7532                 struct mbuf *lm;
7533                 int pads;
7534
7535                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7536                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7537                 if (lm != NULL) {
7538                         chk->last_mbuf = lm;
7539                         chk->pad_inplace = 1;
7540                 }
7541                 chk->send_size += pads;
7542         }
7543         if (PR_SCTP_ENABLED(chk->flags)) {
7544                 asoc->pr_sctp_cnt++;
7545         }
7546         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7547                 /* All done pull and kill the message */
7548                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7549                 if (sp->put_last_out == 0) {
7550                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7551                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7552                             sp->sender_all_done,
7553                             sp->length,
7554                             sp->msg_is_complete,
7555                             sp->put_last_out,
7556                             send_lock_up);
7557                 }
7558                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7559                         SCTP_TCB_SEND_LOCK(stcb);
7560                         send_lock_up = 1;
7561                 }
7562                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7563                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7564                 if (sp->net) {
7565                         sctp_free_remote_addr(sp->net);
7566                         sp->net = NULL;
7567                 }
7568                 if (sp->data) {
7569                         sctp_m_freem(sp->data);
7570                         sp->data = NULL;
7571                 }
7572                 sctp_free_a_strmoq(stcb, sp, so_locked);
7573
7574                 /* we can't be locked to it */
7575                 *locked = 0;
7576                 stcb->asoc.locked_on_sending = NULL;
7577         } else {
7578                 /* more to go, we are locked */
7579                 *locked = 1;
7580         }
7581         asoc->chunks_on_out_queue++;
7582         strq->chunks_on_queues++;
7583         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7584         asoc->send_queue_cnt++;
7585 out_of:
7586         if (send_lock_up) {
7587                 SCTP_TCB_SEND_UNLOCK(stcb);
7588         }
7589         return (to_move);
7590 }
7591
7592
7593 static void
7594 sctp_fill_outqueue(struct sctp_tcb *stcb,
7595     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7596 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7597     SCTP_UNUSED
7598 #endif
7599 )
7600 {
7601         struct sctp_association *asoc;
7602         struct sctp_stream_out *strq;
7603         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7604         int locked, giveup;
7605
7606         SCTP_TCB_LOCK_ASSERT(stcb);
7607         asoc = &stcb->asoc;
7608         switch (net->ro._l_addr.sa.sa_family) {
7609 #ifdef INET
7610         case AF_INET:
7611                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7612                 break;
7613 #endif
7614 #ifdef INET6
7615         case AF_INET6:
7616                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7617                 break;
7618 #endif
7619         default:
7620                 /* TSNH */
7621                 goal_mtu = net->mtu;
7622                 break;
7623         }
7624         /* Need an allowance for the data chunk header too */
7625         goal_mtu -= sizeof(struct sctp_data_chunk);
7626
7627         /* must make even word boundary */
7628         goal_mtu &= 0xfffffffc;
7629         if (asoc->locked_on_sending) {
7630                 /* We are stuck on one stream until the message completes. */
7631                 strq = asoc->locked_on_sending;
7632                 locked = 1;
7633         } else {
7634                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7635                 locked = 0;
7636         }
7637         while ((goal_mtu > 0) && strq) {
7638                 giveup = 0;
7639                 bail = 0;
7640                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7641                     &giveup, eeor_mode, &bail, so_locked);
7642                 if (moved_how_much)
7643                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7644
7645                 if (locked) {
7646                         asoc->locked_on_sending = strq;
7647                         if ((moved_how_much == 0) || (giveup) || bail)
7648                                 /* no more to move for now */
7649                                 break;
7650                 } else {
7651                         asoc->locked_on_sending = NULL;
7652                         if ((giveup) || bail) {
7653                                 break;
7654                         }
7655                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7656                         if (strq == NULL) {
7657                                 break;
7658                         }
7659                 }
7660                 total_moved += moved_how_much;
7661                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7662                 goal_mtu &= 0xfffffffc;
7663         }
7664         if (bail)
7665                 *quit_now = 1;
7666
7667         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7668
7669         if (total_moved == 0) {
7670                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7671                     (net == stcb->asoc.primary_destination)) {
7672                         /* ran dry for primary network net */
7673                         SCTP_STAT_INCR(sctps_primary_randry);
7674                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7675                         /* ran dry with CMT on */
7676                         SCTP_STAT_INCR(sctps_cmt_randry);
7677                 }
7678         }
7679 }
7680
7681 void
7682 sctp_fix_ecn_echo(struct sctp_association *asoc)
7683 {
7684         struct sctp_tmit_chunk *chk;
7685
7686         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7687                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7688                         chk->sent = SCTP_DATAGRAM_UNSENT;
7689                 }
7690         }
7691 }
7692
7693 void
7694 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7695 {
7696         struct sctp_association *asoc;
7697         struct sctp_tmit_chunk *chk;
7698         struct sctp_stream_queue_pending *sp;
7699         unsigned int i;
7700
7701         if (net == NULL) {
7702                 return;
7703         }
7704         asoc = &stcb->asoc;
7705         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7706                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7707                         if (sp->net == net) {
7708                                 sctp_free_remote_addr(sp->net);
7709                                 sp->net = NULL;
7710                         }
7711                 }
7712         }
7713         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7714                 if (chk->whoTo == net) {
7715                         sctp_free_remote_addr(chk->whoTo);
7716                         chk->whoTo = NULL;
7717                 }
7718         }
7719 }
7720
7721 int
7722 sctp_med_chunk_output(struct sctp_inpcb *inp,
7723     struct sctp_tcb *stcb,
7724     struct sctp_association *asoc,
7725     int *num_out,
7726     int *reason_code,
7727     int control_only, int from_where,
7728     struct timeval *now, int *now_filled, int frag_point, int so_locked
7729 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7730     SCTP_UNUSED
7731 #endif
7732 )
7733 {
7734         /**
7735          * Ok this is the generic chunk service queue. we must do the
7736          * following: - Service the stream queue that is next, moving any
7737          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7738          * LAST to the out queue in one pass) and assigning TSN's - Check to
7739          * see if the cwnd/rwnd allows any output, if so we go ahead and
7740          * fomulate and send the low level chunks. Making sure to combine
7741          * any control in the control chunk queue also.
7742          */
7743         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7744         struct mbuf *outchain, *endoutchain;
7745         struct sctp_tmit_chunk *chk, *nchk;
7746
7747         /* temp arrays for unlinking */
7748         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7749         int no_fragmentflg, error;
7750         unsigned int max_rwnd_per_dest, max_send_per_dest;
7751         int one_chunk, hbflag, skip_data_for_this_net;
7752         int asconf, cookie, no_out_cnt;
7753         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7754         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7755         int tsns_sent = 0;
7756         uint32_t auth_offset = 0;
7757         struct sctp_auth_chunk *auth = NULL;
7758         uint16_t auth_keyid;
7759         int override_ok = 1;
7760         int skip_fill_up = 0;
7761         int data_auth_reqd = 0;
7762
7763         /*
7764          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7765          * destination.
7766          */
7767         int quit_now = 0;
7768
7769         *num_out = 0;
7770         *reason_code = 0;
7771         auth_keyid = stcb->asoc.authinfo.active_keyid;
7772         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7773             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7774             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7775                 eeor_mode = 1;
7776         } else {
7777                 eeor_mode = 0;
7778         }
7779         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7780         /*
7781          * First lets prime the pump. For each destination, if there is room
7782          * in the flight size, attempt to pull an MTU's worth out of the
7783          * stream queues into the general send_queue
7784          */
7785 #ifdef SCTP_AUDITING_ENABLED
7786         sctp_audit_log(0xC2, 2);
7787 #endif
7788         SCTP_TCB_LOCK_ASSERT(stcb);
7789         hbflag = 0;
7790         if ((control_only) || (asoc->stream_reset_outstanding))
7791                 no_data_chunks = 1;
7792         else
7793                 no_data_chunks = 0;
7794
7795         /* Nothing to possible to send? */
7796         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7797             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7798             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7799             TAILQ_EMPTY(&asoc->send_queue) &&
7800             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7801 nothing_to_send:
7802                 *reason_code = 9;
7803                 return (0);
7804         }
7805         if (asoc->peers_rwnd == 0) {
7806                 /* No room in peers rwnd */
7807                 *reason_code = 1;
7808                 if (asoc->total_flight > 0) {
7809                         /* we are allowed one chunk in flight */
7810                         no_data_chunks = 1;
7811                 }
7812         }
7813         if (stcb->asoc.ecn_echo_cnt_onq) {
7814                 /* Record where a sack goes, if any */
7815                 if (no_data_chunks &&
7816                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7817                         /* Nothing but ECNe to send - we don't do that */
7818                         goto nothing_to_send;
7819                 }
7820                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7821                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7822                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7823                                 sack_goes_to = chk->whoTo;
7824                                 break;
7825                         }
7826                 }
7827         }
7828         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7829         if (stcb->sctp_socket)
7830                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7831         else
7832                 max_send_per_dest = 0;
7833         if (no_data_chunks == 0) {
7834                 /* How many non-directed chunks are there? */
7835                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7836                         if (chk->whoTo == NULL) {
7837                                 /*
7838                                  * We already have non-directed chunks on
7839                                  * the queue, no need to do a fill-up.
7840                                  */
7841                                 skip_fill_up = 1;
7842                                 break;
7843                         }
7844                 }
7845
7846         }
7847         if ((no_data_chunks == 0) &&
7848             (skip_fill_up == 0) &&
7849             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7850                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7851                         /*
7852                          * This for loop we are in takes in each net, if
7853                          * its's got space in cwnd and has data sent to it
7854                          * (when CMT is off) then it calls
7855                          * sctp_fill_outqueue for the net. This gets data on
7856                          * the send queue for that network.
7857                          *
7858                          * In sctp_fill_outqueue TSN's are assigned and data is
7859                          * copied out of the stream buffers. Note mostly
7860                          * copy by reference (we hope).
7861                          */
7862                         net->window_probe = 0;
7863                         if ((net != stcb->asoc.alternate) &&
7864                             ((net->dest_state & SCTP_ADDR_PF) ||
7865                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7866                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7867                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7868                                         sctp_log_cwnd(stcb, net, 1,
7869                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7870                                 }
7871                                 continue;
7872                         }
7873                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7874                             (net->flight_size == 0)) {
7875                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7876                         }
7877                         if (net->flight_size >= net->cwnd) {
7878                                 /* skip this network, no room - can't fill */
7879                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7880                                         sctp_log_cwnd(stcb, net, 3,
7881                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7882                                 }
7883                                 continue;
7884                         }
7885                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7886                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7887                         }
7888                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7889                         if (quit_now) {
7890                                 /* memory alloc failure */
7891                                 no_data_chunks = 1;
7892                                 break;
7893                         }
7894                 }
7895         }
7896         /* now service each destination and send out what we can for it */
7897         /* Nothing to send? */
7898         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7899             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7900             TAILQ_EMPTY(&asoc->send_queue)) {
7901                 *reason_code = 8;
7902                 return (0);
7903         }
7904         if (asoc->sctp_cmt_on_off > 0) {
7905                 /* get the last start point */
7906                 start_at = asoc->last_net_cmt_send_started;
7907                 if (start_at == NULL) {
7908                         /* null so to beginning */
7909                         start_at = TAILQ_FIRST(&asoc->nets);
7910                 } else {
7911                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7912                         if (start_at == NULL) {
7913                                 start_at = TAILQ_FIRST(&asoc->nets);
7914                         }
7915                 }
7916                 asoc->last_net_cmt_send_started = start_at;
7917         } else {
7918                 start_at = TAILQ_FIRST(&asoc->nets);
7919         }
7920         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7921                 if (chk->whoTo == NULL) {
7922                         if (asoc->alternate) {
7923                                 chk->whoTo = asoc->alternate;
7924                         } else {
7925                                 chk->whoTo = asoc->primary_destination;
7926                         }
7927                         atomic_add_int(&chk->whoTo->ref_count, 1);
7928                 }
7929         }
7930         old_start_at = NULL;
7931 again_one_more_time:
7932         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7933                 /* how much can we send? */
7934                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7935                 if (old_start_at && (old_start_at == net)) {
7936                         /* through list ocmpletely. */
7937                         break;
7938                 }
7939                 tsns_sent = 0xa;
7940                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7941                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7942                     (net->flight_size >= net->cwnd)) {
7943                         /*
7944                          * Nothing on control or asconf and flight is full,
7945                          * we can skip even in the CMT case.
7946                          */
7947                         continue;
7948                 }
7949                 bundle_at = 0;
7950                 endoutchain = outchain = NULL;
7951                 no_fragmentflg = 1;
7952                 one_chunk = 0;
7953                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7954                         skip_data_for_this_net = 1;
7955                 } else {
7956                         skip_data_for_this_net = 0;
7957                 }
7958                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7959                         /*
7960                          * if we have a route and an ifp check to see if we
7961                          * have room to send to this guy
7962                          */
7963                         struct ifnet *ifp;
7964
7965                         ifp = net->ro.ro_rt->rt_ifp;
7966                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7967                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7968                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7969                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7970                                 }
7971                                 continue;
7972                         }
7973                 }
7974                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7975 #ifdef INET
7976                 case AF_INET:
7977                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7978                         break;
7979 #endif
7980 #ifdef INET6
7981                 case AF_INET6:
7982                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
7983                         break;
7984 #endif
7985                 default:
7986                         /* TSNH */
7987                         mtu = net->mtu;
7988                         break;
7989                 }
7990                 mx_mtu = mtu;
7991                 to_out = 0;
7992                 if (mtu > asoc->peers_rwnd) {
7993                         if (asoc->total_flight > 0) {
7994                                 /* We have a packet in flight somewhere */
7995                                 r_mtu = asoc->peers_rwnd;
7996                         } else {
7997                                 /* We are always allowed to send one MTU out */
7998                                 one_chunk = 1;
7999                                 r_mtu = mtu;
8000                         }
8001                 } else {
8002                         r_mtu = mtu;
8003                 }
8004                 error = 0;
8005                 /************************/
8006                 /* ASCONF transmission */
8007                 /************************/
8008                 /* Now first lets go through the asconf queue */
8009                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8010                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8011                                 continue;
8012                         }
8013                         if (chk->whoTo == NULL) {
8014                                 if (asoc->alternate == NULL) {
8015                                         if (asoc->primary_destination != net) {
8016                                                 break;
8017                                         }
8018                                 } else {
8019                                         if (asoc->alternate != net) {
8020                                                 break;
8021                                         }
8022                                 }
8023                         } else {
8024                                 if (chk->whoTo != net) {
8025                                         break;
8026                                 }
8027                         }
8028                         if (chk->data == NULL) {
8029                                 break;
8030                         }
8031                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8032                             chk->sent != SCTP_DATAGRAM_RESEND) {
8033                                 break;
8034                         }
8035                         /*
8036                          * if no AUTH is yet included and this chunk
8037                          * requires it, make sure to account for it.  We
8038                          * don't apply the size until the AUTH chunk is
8039                          * actually added below in case there is no room for
8040                          * this chunk. NOTE: we overload the use of "omtu"
8041                          * here
8042                          */
8043                         if ((auth == NULL) &&
8044                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8045                             stcb->asoc.peer_auth_chunks)) {
8046                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8047                         } else
8048                                 omtu = 0;
8049                         /* Here we do NOT factor the r_mtu */
8050                         if ((chk->send_size < (int)(mtu - omtu)) ||
8051                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8052                                 /*
8053                                  * We probably should glom the mbuf chain
8054                                  * from the chk->data for control but the
8055                                  * problem is it becomes yet one more level
8056                                  * of tracking to do if for some reason
8057                                  * output fails. Then I have got to
8058                                  * reconstruct the merged control chain.. el
8059                                  * yucko.. for now we take the easy way and
8060                                  * do the copy
8061                                  */
8062                                 /*
8063                                  * Add an AUTH chunk, if chunk requires it
8064                                  * save the offset into the chain for AUTH
8065                                  */
8066                                 if ((auth == NULL) &&
8067                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8068                                     stcb->asoc.peer_auth_chunks))) {
8069                                         outchain = sctp_add_auth_chunk(outchain,
8070                                             &endoutchain,
8071                                             &auth,
8072                                             &auth_offset,
8073                                             stcb,
8074                                             chk->rec.chunk_id.id);
8075                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8076                                 }
8077                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8078                                     (int)chk->rec.chunk_id.can_take_data,
8079                                     chk->send_size, chk->copy_by_ref);
8080                                 if (outchain == NULL) {
8081                                         *reason_code = 8;
8082                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8083                                         return (ENOMEM);
8084                                 }
8085                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8086                                 /* update our MTU size */
8087                                 if (mtu > (chk->send_size + omtu))
8088                                         mtu -= (chk->send_size + omtu);
8089                                 else
8090                                         mtu = 0;
8091                                 to_out += (chk->send_size + omtu);
8092                                 /* Do clear IP_DF ? */
8093                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8094                                         no_fragmentflg = 0;
8095                                 }
8096                                 if (chk->rec.chunk_id.can_take_data)
8097                                         chk->data = NULL;
8098                                 /*
8099                                  * set hb flag since we can use these for
8100                                  * RTO
8101                                  */
8102                                 hbflag = 1;
8103                                 asconf = 1;
8104                                 /*
8105                                  * should sysctl this: don't bundle data
8106                                  * with ASCONF since it requires AUTH
8107                                  */
8108                                 no_data_chunks = 1;
8109                                 chk->sent = SCTP_DATAGRAM_SENT;
8110                                 if (chk->whoTo == NULL) {
8111                                         chk->whoTo = net;
8112                                         atomic_add_int(&net->ref_count, 1);
8113                                 }
8114                                 chk->snd_count++;
8115                                 if (mtu == 0) {
8116                                         /*
8117                                          * Ok we are out of room but we can
8118                                          * output without effecting the
8119                                          * flight size since this little guy
8120                                          * is a control only packet.
8121                                          */
8122                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8123                                         /*
8124                                          * do NOT clear the asconf flag as
8125                                          * it is used to do appropriate
8126                                          * source address selection.
8127                                          */
8128                                         if (*now_filled == 0) {
8129                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8130                                                 *now_filled = 1;
8131                                         }
8132                                         net->last_sent_time = *now;
8133                                         hbflag = 0;
8134                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8135                                             (struct sockaddr *)&net->ro._l_addr,
8136                                             outchain, auth_offset, auth,
8137                                             stcb->asoc.authinfo.active_keyid,
8138                                             no_fragmentflg, 0, asconf,
8139                                             inp->sctp_lport, stcb->rport,
8140                                             htonl(stcb->asoc.peer_vtag),
8141                                             net->port, NULL,
8142                                             0, 0,
8143                                             so_locked))) {
8144                                                 /*
8145                                                  * error, we could not
8146                                                  * output
8147                                                  */
8148                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8149                                                 if (from_where == 0) {
8150                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8151                                                 }
8152                                                 if (error == ENOBUFS) {
8153                                                         asoc->ifp_had_enobuf = 1;
8154                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8155                                                 }
8156                                                 /* error, could not output */
8157                                                 if (error == EHOSTUNREACH) {
8158                                                         /*
8159                                                          * Destination went
8160                                                          * unreachable
8161                                                          * during this send
8162                                                          */
8163                                                         sctp_move_chunks_from_net(stcb, net);
8164                                                 }
8165                                                 *reason_code = 7;
8166                                                 break;
8167                                         } else {
8168                                                 asoc->ifp_had_enobuf = 0;
8169                                         }
8170                                         /*
8171                                          * increase the number we sent, if a
8172                                          * cookie is sent we don't tell them
8173                                          * any was sent out.
8174                                          */
8175                                         outchain = endoutchain = NULL;
8176                                         auth = NULL;
8177                                         auth_offset = 0;
8178                                         if (!no_out_cnt)
8179                                                 *num_out += ctl_cnt;
8180                                         /* recalc a clean slate and setup */
8181                                         switch (net->ro._l_addr.sa.sa_family) {
8182 #ifdef INET
8183                                         case AF_INET:
8184                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8185                                                 break;
8186 #endif
8187 #ifdef INET6
8188                                         case AF_INET6:
8189                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8190                                                 break;
8191 #endif
8192                                         default:
8193                                                 /* TSNH */
8194                                                 mtu = net->mtu;
8195                                                 break;
8196                                         }
8197                                         to_out = 0;
8198                                         no_fragmentflg = 1;
8199                                 }
8200                         }
8201                 }
8202                 if (error != 0) {
8203                         /* try next net */
8204                         continue;
8205                 }
8206                 /************************/
8207                 /* Control transmission */
8208                 /************************/
8209                 /* Now first lets go through the control queue */
8210                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8211                         if ((sack_goes_to) &&
8212                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8213                             (chk->whoTo != sack_goes_to)) {
8214                                 /*
8215                                  * if we have a sack in queue, and we are
8216                                  * looking at an ecn echo that is NOT queued
8217                                  * to where the sack is going..
8218                                  */
8219                                 if (chk->whoTo == net) {
8220                                         /*
8221                                          * Don't transmit it to where its
8222                                          * going (current net)
8223                                          */
8224                                         continue;
8225                                 } else if (sack_goes_to == net) {
8226                                         /*
8227                                          * But do transmit it to this
8228                                          * address
8229                                          */
8230                                         goto skip_net_check;
8231                                 }
8232                         }
8233                         if (chk->whoTo == NULL) {
8234                                 if (asoc->alternate == NULL) {
8235                                         if (asoc->primary_destination != net) {
8236                                                 continue;
8237                                         }
8238                                 } else {
8239                                         if (asoc->alternate != net) {
8240                                                 continue;
8241                                         }
8242                                 }
8243                         } else {
8244                                 if (chk->whoTo != net) {
8245                                         continue;
8246                                 }
8247                         }
8248         skip_net_check:
8249                         if (chk->data == NULL) {
8250                                 continue;
8251                         }
8252                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8253                                 /*
8254                                  * It must be unsent. Cookies and ASCONF's
8255                                  * hang around but there timers will force
8256                                  * when marked for resend.
8257                                  */
8258                                 continue;
8259                         }
8260                         /*
8261                          * if no AUTH is yet included and this chunk
8262                          * requires it, make sure to account for it.  We
8263                          * don't apply the size until the AUTH chunk is
8264                          * actually added below in case there is no room for
8265                          * this chunk. NOTE: we overload the use of "omtu"
8266                          * here
8267                          */
8268                         if ((auth == NULL) &&
8269                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8270                             stcb->asoc.peer_auth_chunks)) {
8271                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8272                         } else
8273                                 omtu = 0;
8274                         /* Here we do NOT factor the r_mtu */
8275                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8276                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8277                                 /*
8278                                  * We probably should glom the mbuf chain
8279                                  * from the chk->data for control but the
8280                                  * problem is it becomes yet one more level
8281                                  * of tracking to do if for some reason
8282                                  * output fails. Then I have got to
8283                                  * reconstruct the merged control chain.. el
8284                                  * yucko.. for now we take the easy way and
8285                                  * do the copy
8286                                  */
8287                                 /*
8288                                  * Add an AUTH chunk, if chunk requires it
8289                                  * save the offset into the chain for AUTH
8290                                  */
8291                                 if ((auth == NULL) &&
8292                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8293                                     stcb->asoc.peer_auth_chunks))) {
8294                                         outchain = sctp_add_auth_chunk(outchain,
8295                                             &endoutchain,
8296                                             &auth,
8297                                             &auth_offset,
8298                                             stcb,
8299                                             chk->rec.chunk_id.id);
8300                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8301                                 }
8302                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8303                                     (int)chk->rec.chunk_id.can_take_data,
8304                                     chk->send_size, chk->copy_by_ref);
8305                                 if (outchain == NULL) {
8306                                         *reason_code = 8;
8307                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8308                                         return (ENOMEM);
8309                                 }
8310                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8311                                 /* update our MTU size */
8312                                 if (mtu > (chk->send_size + omtu))
8313                                         mtu -= (chk->send_size + omtu);
8314                                 else
8315                                         mtu = 0;
8316                                 to_out += (chk->send_size + omtu);
8317                                 /* Do clear IP_DF ? */
8318                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8319                                         no_fragmentflg = 0;
8320                                 }
8321                                 if (chk->rec.chunk_id.can_take_data)
8322                                         chk->data = NULL;
8323                                 /* Mark things to be removed, if needed */
8324                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8325                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8326                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8327                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8328                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8329                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8330                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8331                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8332                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8333                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8334                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8335                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8336                                                 hbflag = 1;
8337                                         }
8338                                         /* remove these chunks at the end */
8339                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8340                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8341                                                 /* turn off the timer */
8342                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8343                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8344                                                             inp, stcb, net,
8345                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8346                                                 }
8347                                         }
8348                                         ctl_cnt++;
8349                                 } else {
8350                                         /*
8351                                          * Other chunks, since they have
8352                                          * timers running (i.e. COOKIE) we
8353                                          * just "trust" that it gets sent or
8354                                          * retransmitted.
8355                                          */
8356                                         ctl_cnt++;
8357                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8358                                                 cookie = 1;
8359                                                 no_out_cnt = 1;
8360                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8361                                                 /*
8362                                                  * Increment ecne send count
8363                                                  * here this means we may be
8364                                                  * over-zealous in our
8365                                                  * counting if the send
8366                                                  * fails, but its the best
8367                                                  * place to do it (we used
8368                                                  * to do it in the queue of
8369                                                  * the chunk, but that did
8370                                                  * not tell how many times
8371                                                  * it was sent.
8372                                                  */
8373                                                 SCTP_STAT_INCR(sctps_sendecne);
8374                                         }
8375                                         chk->sent = SCTP_DATAGRAM_SENT;
8376                                         if (chk->whoTo == NULL) {
8377                                                 chk->whoTo = net;
8378                                                 atomic_add_int(&net->ref_count, 1);
8379                                         }
8380                                         chk->snd_count++;
8381                                 }
8382                                 if (mtu == 0) {
8383                                         /*
8384                                          * Ok we are out of room but we can
8385                                          * output without effecting the
8386                                          * flight size since this little guy
8387                                          * is a control only packet.
8388                                          */
8389                                         if (asconf) {
8390                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8391                                                 /*
8392                                                  * do NOT clear the asconf
8393                                                  * flag as it is used to do
8394                                                  * appropriate source
8395                                                  * address selection.
8396                                                  */
8397                                         }
8398                                         if (cookie) {
8399                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8400                                                 cookie = 0;
8401                                         }
8402                                         /* Only HB or ASCONF advances time */
8403                                         if (hbflag) {
8404                                                 if (*now_filled == 0) {
8405                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8406                                                         *now_filled = 1;
8407                                                 }
8408                                                 net->last_sent_time = *now;
8409                                                 hbflag = 0;
8410                                         }
8411                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8412                                             (struct sockaddr *)&net->ro._l_addr,
8413                                             outchain,
8414                                             auth_offset, auth,
8415                                             stcb->asoc.authinfo.active_keyid,
8416                                             no_fragmentflg, 0, asconf,
8417                                             inp->sctp_lport, stcb->rport,
8418                                             htonl(stcb->asoc.peer_vtag),
8419                                             net->port, NULL,
8420                                             0, 0,
8421                                             so_locked))) {
8422                                                 /*
8423                                                  * error, we could not
8424                                                  * output
8425                                                  */
8426                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8427                                                 if (from_where == 0) {
8428                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8429                                                 }
8430                                                 if (error == ENOBUFS) {
8431                                                         asoc->ifp_had_enobuf = 1;
8432                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8433                                                 }
8434                                                 if (error == EHOSTUNREACH) {
8435                                                         /*
8436                                                          * Destination went
8437                                                          * unreachable
8438                                                          * during this send
8439                                                          */
8440                                                         sctp_move_chunks_from_net(stcb, net);
8441                                                 }
8442                                                 *reason_code = 7;
8443                                                 break;
8444                                         } else {
8445                                                 asoc->ifp_had_enobuf = 0;
8446                                         }
8447                                         /*
8448                                          * increase the number we sent, if a
8449                                          * cookie is sent we don't tell them
8450                                          * any was sent out.
8451                                          */
8452                                         outchain = endoutchain = NULL;
8453                                         auth = NULL;
8454                                         auth_offset = 0;
8455                                         if (!no_out_cnt)
8456                                                 *num_out += ctl_cnt;
8457                                         /* recalc a clean slate and setup */
8458                                         switch (net->ro._l_addr.sa.sa_family) {
8459 #ifdef INET
8460                                         case AF_INET:
8461                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8462                                                 break;
8463 #endif
8464 #ifdef INET6
8465                                         case AF_INET6:
8466                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8467                                                 break;
8468 #endif
8469                                         default:
8470                                                 /* TSNH */
8471                                                 mtu = net->mtu;
8472                                                 break;
8473                                         }
8474                                         to_out = 0;
8475                                         no_fragmentflg = 1;
8476                                 }
8477                         }
8478                 }
8479                 if (error != 0) {
8480                         /* try next net */
8481                         continue;
8482                 }
8483                 /* JRI: if dest is in PF state, do not send data to it */
8484                 if ((asoc->sctp_cmt_on_off > 0) &&
8485                     (net != stcb->asoc.alternate) &&
8486                     (net->dest_state & SCTP_ADDR_PF)) {
8487                         goto no_data_fill;
8488                 }
8489                 if (net->flight_size >= net->cwnd) {
8490                         goto no_data_fill;
8491                 }
8492                 if ((asoc->sctp_cmt_on_off > 0) &&
8493                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8494                     (net->flight_size > max_rwnd_per_dest)) {
8495                         goto no_data_fill;
8496                 }
8497                 /*
8498                  * We need a specific accounting for the usage of the send
8499                  * buffer. We also need to check the number of messages per
8500                  * net. For now, this is better than nothing and it disabled
8501                  * by default...
8502                  */
8503                 if ((asoc->sctp_cmt_on_off > 0) &&
8504                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8505                     (max_send_per_dest > 0) &&
8506                     (net->flight_size > max_send_per_dest)) {
8507                         goto no_data_fill;
8508                 }
8509                 /*********************/
8510                 /* Data transmission */
8511                 /*********************/
8512                 /*
8513                  * if AUTH for DATA is required and no AUTH has been added
8514                  * yet, account for this in the mtu now... if no data can be
8515                  * bundled, this adjustment won't matter anyways since the
8516                  * packet will be going out...
8517                  */
8518                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8519                     stcb->asoc.peer_auth_chunks);
8520                 if (data_auth_reqd && (auth == NULL)) {
8521                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8522                 }
8523                 /* now lets add any data within the MTU constraints */
8524                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8525 #ifdef INET
8526                 case AF_INET:
8527                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8528                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8529                         else
8530                                 omtu = 0;
8531                         break;
8532 #endif
8533 #ifdef INET6
8534                 case AF_INET6:
8535                         if (net->mtu > SCTP_MIN_OVERHEAD)
8536                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8537                         else
8538                                 omtu = 0;
8539                         break;
8540 #endif
8541                 default:
8542                         /* TSNH */
8543                         omtu = 0;
8544                         break;
8545                 }
8546                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8547                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8548                     (skip_data_for_this_net == 0)) ||
8549                     (cookie)) {
8550                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8551                                 if (no_data_chunks) {
8552                                         /* let only control go out */
8553                                         *reason_code = 1;
8554                                         break;
8555                                 }
8556                                 if (net->flight_size >= net->cwnd) {
8557                                         /* skip this net, no room for data */
8558                                         *reason_code = 2;
8559                                         break;
8560                                 }
8561                                 if ((chk->whoTo != NULL) &&
8562                                     (chk->whoTo != net)) {
8563                                         /* Don't send the chunk on this net */
8564                                         continue;
8565                                 }
8566                                 if (asoc->sctp_cmt_on_off == 0) {
8567                                         if ((asoc->alternate) &&
8568                                             (asoc->alternate != net) &&
8569                                             (chk->whoTo == NULL)) {
8570                                                 continue;
8571                                         } else if ((net != asoc->primary_destination) &&
8572                                                     (asoc->alternate == NULL) &&
8573                                             (chk->whoTo == NULL)) {
8574                                                 continue;
8575                                         }
8576                                 }
8577                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8578                                         /*-
8579                                          * strange, we have a chunk that is
8580                                          * to big for its destination and
8581                                          * yet no fragment ok flag.
8582                                          * Something went wrong when the
8583                                          * PMTU changed...we did not mark
8584                                          * this chunk for some reason?? I
8585                                          * will fix it here by letting IP
8586                                          * fragment it for now and printing
8587                                          * a warning. This really should not
8588                                          * happen ...
8589                                          */
8590                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8591                                             chk->send_size, mtu);
8592                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8593                                 }
8594                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8595                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8596                                         struct sctp_data_chunk *dchkh;
8597
8598                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8599                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8600                                 }
8601                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8602                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8603                                         /* ok we will add this one */
8604
8605                                         /*
8606                                          * Add an AUTH chunk, if chunk
8607                                          * requires it, save the offset into
8608                                          * the chain for AUTH
8609                                          */
8610                                         if (data_auth_reqd) {
8611                                                 if (auth == NULL) {
8612                                                         outchain = sctp_add_auth_chunk(outchain,
8613                                                             &endoutchain,
8614                                                             &auth,
8615                                                             &auth_offset,
8616                                                             stcb,
8617                                                             SCTP_DATA);
8618                                                         auth_keyid = chk->auth_keyid;
8619                                                         override_ok = 0;
8620                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8621                                                 } else if (override_ok) {
8622                                                         /*
8623                                                          * use this data's
8624                                                          * keyid
8625                                                          */
8626                                                         auth_keyid = chk->auth_keyid;
8627                                                         override_ok = 0;
8628                                                 } else if (auth_keyid != chk->auth_keyid) {
8629                                                         /*
8630                                                          * different keyid,
8631                                                          * so done bundling
8632                                                          */
8633                                                         break;
8634                                                 }
8635                                         }
8636                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8637                                             chk->send_size, chk->copy_by_ref);
8638                                         if (outchain == NULL) {
8639                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8640                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8641                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8642                                                 }
8643                                                 *reason_code = 3;
8644                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8645                                                 return (ENOMEM);
8646                                         }
8647                                         /* upate our MTU size */
8648                                         /* Do clear IP_DF ? */
8649                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8650                                                 no_fragmentflg = 0;
8651                                         }
8652                                         /* unsigned subtraction of mtu */
8653                                         if (mtu > chk->send_size)
8654                                                 mtu -= chk->send_size;
8655                                         else
8656                                                 mtu = 0;
8657                                         /* unsigned subtraction of r_mtu */
8658                                         if (r_mtu > chk->send_size)
8659                                                 r_mtu -= chk->send_size;
8660                                         else
8661                                                 r_mtu = 0;
8662
8663                                         to_out += chk->send_size;
8664                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8665 #ifdef INVARIANTS
8666                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8667 #else
8668                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8669                                                     mx_mtu, to_out);
8670 #endif
8671                                         }
8672                                         chk->window_probe = 0;
8673                                         data_list[bundle_at++] = chk;
8674                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8675                                                 break;
8676                                         }
8677                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8678                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8679                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8680                                                 } else {
8681                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8682                                                 }
8683                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8684                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8685                                                         /*
8686                                                          * Count number of
8687                                                          * user msg's that
8688                                                          * were fragmented
8689                                                          * we do this by
8690                                                          * counting when we
8691                                                          * see a LAST
8692                                                          * fragment only.
8693                                                          */
8694                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8695                                         }
8696                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8697                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8698                                                         data_list[0]->window_probe = 1;
8699                                                         net->window_probe = 1;
8700                                                 }
8701                                                 break;
8702                                         }
8703                                 } else {
8704                                         /*
8705                                          * Must be sent in order of the
8706                                          * TSN's (on a network)
8707                                          */
8708                                         break;
8709                                 }
8710                         }       /* for (chunk gather loop for this net) */
8711                 }               /* if asoc.state OPEN */
8712 no_data_fill:
8713                 /* Is there something to send for this destination? */
8714                 if (outchain) {
8715                         /* We may need to start a control timer or two */
8716                         if (asconf) {
8717                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8718                                     stcb, net);
8719                                 /*
8720                                  * do NOT clear the asconf flag as it is
8721                                  * used to do appropriate source address
8722                                  * selection.
8723                                  */
8724                         }
8725                         if (cookie) {
8726                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8727                                 cookie = 0;
8728                         }
8729                         /* must start a send timer if data is being sent */
8730                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8731                                 /*
8732                                  * no timer running on this destination
8733                                  * restart it.
8734                                  */
8735                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8736                         }
8737                         if (bundle_at || hbflag) {
8738                                 /* For data/asconf and hb set time */
8739                                 if (*now_filled == 0) {
8740                                         (void)SCTP_GETTIME_TIMEVAL(now);
8741                                         *now_filled = 1;
8742                                 }
8743                                 net->last_sent_time = *now;
8744                         }
8745                         /* Now send it, if there is anything to send :> */
8746                         if ((error = sctp_lowlevel_chunk_output(inp,
8747                             stcb,
8748                             net,
8749                             (struct sockaddr *)&net->ro._l_addr,
8750                             outchain,
8751                             auth_offset,
8752                             auth,
8753                             auth_keyid,
8754                             no_fragmentflg,
8755                             bundle_at,
8756                             asconf,
8757                             inp->sctp_lport, stcb->rport,
8758                             htonl(stcb->asoc.peer_vtag),
8759                             net->port, NULL,
8760                             0, 0,
8761                             so_locked))) {
8762                                 /* error, we could not output */
8763                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8764                                 if (from_where == 0) {
8765                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8766                                 }
8767                                 if (error == ENOBUFS) {
8768                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8769                                         asoc->ifp_had_enobuf = 1;
8770                                 }
8771                                 if (error == EHOSTUNREACH) {
8772                                         /*
8773                                          * Destination went unreachable
8774                                          * during this send
8775                                          */
8776                                         sctp_move_chunks_from_net(stcb, net);
8777                                 }
8778                                 *reason_code = 6;
8779                                 /*-
8780                                  * I add this line to be paranoid. As far as
8781                                  * I can tell the continue, takes us back to
8782                                  * the top of the for, but just to make sure
8783                                  * I will reset these again here.
8784                                  */
8785                                 ctl_cnt = bundle_at = 0;
8786                                 continue;       /* This takes us back to the
8787                                                  * for() for the nets. */
8788                         } else {
8789                                 asoc->ifp_had_enobuf = 0;
8790                         }
8791                         endoutchain = NULL;
8792                         auth = NULL;
8793                         auth_offset = 0;
8794                         if (!no_out_cnt) {
8795                                 *num_out += (ctl_cnt + bundle_at);
8796                         }
8797                         if (bundle_at) {
8798                                 /* setup for a RTO measurement */
8799                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8800                                 /* fill time if not already filled */
8801                                 if (*now_filled == 0) {
8802                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8803                                         *now_filled = 1;
8804                                         *now = asoc->time_last_sent;
8805                                 } else {
8806                                         asoc->time_last_sent = *now;
8807                                 }
8808                                 if (net->rto_needed) {
8809                                         data_list[0]->do_rtt = 1;
8810                                         net->rto_needed = 0;
8811                                 }
8812                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8813                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8814                         }
8815                         if (one_chunk) {
8816                                 break;
8817                         }
8818                 }
8819                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8820                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8821                 }
8822         }
8823         if (old_start_at == NULL) {
8824                 old_start_at = start_at;
8825                 start_at = TAILQ_FIRST(&asoc->nets);
8826                 if (old_start_at)
8827                         goto again_one_more_time;
8828         }
8829         /*
8830          * At the end there should be no NON timed chunks hanging on this
8831          * queue.
8832          */
8833         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8834                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8835         }
8836         if ((*num_out == 0) && (*reason_code == 0)) {
8837                 *reason_code = 4;
8838         } else {
8839                 *reason_code = 5;
8840         }
8841         sctp_clean_up_ctl(stcb, asoc, so_locked);
8842         return (0);
8843 }
8844
8845 void
8846 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8847 {
8848         /*-
8849          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8850          * the control chunk queue.
8851          */
8852         struct sctp_chunkhdr *hdr;
8853         struct sctp_tmit_chunk *chk;
8854         struct mbuf *mat;
8855
8856         SCTP_TCB_LOCK_ASSERT(stcb);
8857         sctp_alloc_a_chunk(stcb, chk);
8858         if (chk == NULL) {
8859                 /* no memory */
8860                 sctp_m_freem(op_err);
8861                 return;
8862         }
8863         chk->copy_by_ref = 0;
8864         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8865         if (op_err == NULL) {
8866                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8867                 return;
8868         }
8869         chk->send_size = 0;
8870         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8871                 chk->send_size += SCTP_BUF_LEN(mat);
8872         }
8873         chk->sent = SCTP_DATAGRAM_UNSENT;
8874         chk->snd_count = 0;
8875         chk->asoc = &stcb->asoc;
8876         chk->data = op_err;
8877         chk->whoTo = NULL;
8878         hdr = mtod(op_err, struct sctp_chunkhdr *);
8879         hdr->chunk_type = SCTP_OPERATION_ERROR;
8880         hdr->chunk_flags = 0;
8881         hdr->chunk_length = htons(chk->send_size);
8882         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8883             chk,
8884             sctp_next);
8885         chk->asoc->ctrl_queue_cnt++;
8886 }
8887
8888 int
8889 sctp_send_cookie_echo(struct mbuf *m,
8890     int offset,
8891     struct sctp_tcb *stcb,
8892     struct sctp_nets *net)
8893 {
8894         /*-
8895          * pull out the cookie and put it at the front of the control chunk
8896          * queue.
8897          */
8898         int at;
8899         struct mbuf *cookie;
8900         struct sctp_paramhdr parm, *phdr;
8901         struct sctp_chunkhdr *hdr;
8902         struct sctp_tmit_chunk *chk;
8903         uint16_t ptype, plen;
8904
8905         SCTP_TCB_LOCK_ASSERT(stcb);
8906         /* First find the cookie in the param area */
8907         cookie = NULL;
8908         at = offset + sizeof(struct sctp_init_chunk);
8909         for (;;) {
8910                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8911                 if (phdr == NULL) {
8912                         return (-3);
8913                 }
8914                 ptype = ntohs(phdr->param_type);
8915                 plen = ntohs(phdr->param_length);
8916                 if (ptype == SCTP_STATE_COOKIE) {
8917                         int pad;
8918
8919                         /* found the cookie */
8920                         if ((pad = (plen % 4))) {
8921                                 plen += 4 - pad;
8922                         }
8923                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8924                         if (cookie == NULL) {
8925                                 /* No memory */
8926                                 return (-2);
8927                         }
8928 #ifdef SCTP_MBUF_LOGGING
8929                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8930                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8931                         }
8932 #endif
8933                         break;
8934                 }
8935                 at += SCTP_SIZE32(plen);
8936         }
8937         /* ok, we got the cookie lets change it into a cookie echo chunk */
8938         /* first the change from param to cookie */
8939         hdr = mtod(cookie, struct sctp_chunkhdr *);
8940         hdr->chunk_type = SCTP_COOKIE_ECHO;
8941         hdr->chunk_flags = 0;
8942         /* get the chunk stuff now and place it in the FRONT of the queue */
8943         sctp_alloc_a_chunk(stcb, chk);
8944         if (chk == NULL) {
8945                 /* no memory */
8946                 sctp_m_freem(cookie);
8947                 return (-5);
8948         }
8949         chk->copy_by_ref = 0;
8950         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8951         chk->rec.chunk_id.can_take_data = 0;
8952         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8953         chk->send_size = plen;
8954         chk->sent = SCTP_DATAGRAM_UNSENT;
8955         chk->snd_count = 0;
8956         chk->asoc = &stcb->asoc;
8957         chk->data = cookie;
8958         chk->whoTo = net;
8959         atomic_add_int(&chk->whoTo->ref_count, 1);
8960         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8961         chk->asoc->ctrl_queue_cnt++;
8962         return (0);
8963 }
8964
8965 void
8966 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8967     struct mbuf *m,
8968     int offset,
8969     int chk_length,
8970     struct sctp_nets *net)
8971 {
8972         /*
8973          * take a HB request and make it into a HB ack and send it.
8974          */
8975         struct mbuf *outchain;
8976         struct sctp_chunkhdr *chdr;
8977         struct sctp_tmit_chunk *chk;
8978
8979
8980         if (net == NULL)
8981                 /* must have a net pointer */
8982                 return;
8983
8984         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
8985         if (outchain == NULL) {
8986                 /* gak out of memory */
8987                 return;
8988         }
8989 #ifdef SCTP_MBUF_LOGGING
8990         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8991                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
8992         }
8993 #endif
8994         chdr = mtod(outchain, struct sctp_chunkhdr *);
8995         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8996         chdr->chunk_flags = 0;
8997         if (chk_length % 4) {
8998                 /* need pad */
8999                 uint32_t cpthis = 0;
9000                 int padlen;
9001
9002                 padlen = 4 - (chk_length % 4);
9003                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9004         }
9005         sctp_alloc_a_chunk(stcb, chk);
9006         if (chk == NULL) {
9007                 /* no memory */
9008                 sctp_m_freem(outchain);
9009                 return;
9010         }
9011         chk->copy_by_ref = 0;
9012         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9013         chk->rec.chunk_id.can_take_data = 1;
9014         chk->flags = 0;
9015         chk->send_size = chk_length;
9016         chk->sent = SCTP_DATAGRAM_UNSENT;
9017         chk->snd_count = 0;
9018         chk->asoc = &stcb->asoc;
9019         chk->data = outchain;
9020         chk->whoTo = net;
9021         atomic_add_int(&chk->whoTo->ref_count, 1);
9022         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9023         chk->asoc->ctrl_queue_cnt++;
9024 }
9025
9026 void
9027 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9028 {
9029         /* formulate and queue a cookie-ack back to sender */
9030         struct mbuf *cookie_ack;
9031         struct sctp_chunkhdr *hdr;
9032         struct sctp_tmit_chunk *chk;
9033
9034         SCTP_TCB_LOCK_ASSERT(stcb);
9035
9036         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9037         if (cookie_ack == NULL) {
9038                 /* no mbuf's */
9039                 return;
9040         }
9041         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9042         sctp_alloc_a_chunk(stcb, chk);
9043         if (chk == NULL) {
9044                 /* no memory */
9045                 sctp_m_freem(cookie_ack);
9046                 return;
9047         }
9048         chk->copy_by_ref = 0;
9049         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9050         chk->rec.chunk_id.can_take_data = 1;
9051         chk->flags = 0;
9052         chk->send_size = sizeof(struct sctp_chunkhdr);
9053         chk->sent = SCTP_DATAGRAM_UNSENT;
9054         chk->snd_count = 0;
9055         chk->asoc = &stcb->asoc;
9056         chk->data = cookie_ack;
9057         if (chk->asoc->last_control_chunk_from != NULL) {
9058                 chk->whoTo = chk->asoc->last_control_chunk_from;
9059                 atomic_add_int(&chk->whoTo->ref_count, 1);
9060         } else {
9061                 chk->whoTo = NULL;
9062         }
9063         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9064         hdr->chunk_type = SCTP_COOKIE_ACK;
9065         hdr->chunk_flags = 0;
9066         hdr->chunk_length = htons(chk->send_size);
9067         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9068         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9069         chk->asoc->ctrl_queue_cnt++;
9070         return;
9071 }
9072
9073
9074 void
9075 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9076 {
9077         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9078         struct mbuf *m_shutdown_ack;
9079         struct sctp_shutdown_ack_chunk *ack_cp;
9080         struct sctp_tmit_chunk *chk;
9081
9082         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9083         if (m_shutdown_ack == NULL) {
9084                 /* no mbuf's */
9085                 return;
9086         }
9087         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9088         sctp_alloc_a_chunk(stcb, chk);
9089         if (chk == NULL) {
9090                 /* no memory */
9091                 sctp_m_freem(m_shutdown_ack);
9092                 return;
9093         }
9094         chk->copy_by_ref = 0;
9095         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9096         chk->rec.chunk_id.can_take_data = 1;
9097         chk->flags = 0;
9098         chk->send_size = sizeof(struct sctp_chunkhdr);
9099         chk->sent = SCTP_DATAGRAM_UNSENT;
9100         chk->snd_count = 0;
9101         chk->flags = 0;
9102         chk->asoc = &stcb->asoc;
9103         chk->data = m_shutdown_ack;
9104         chk->whoTo = net;
9105         if (chk->whoTo) {
9106                 atomic_add_int(&chk->whoTo->ref_count, 1);
9107         }
9108         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9109         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9110         ack_cp->ch.chunk_flags = 0;
9111         ack_cp->ch.chunk_length = htons(chk->send_size);
9112         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9113         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9114         chk->asoc->ctrl_queue_cnt++;
9115         return;
9116 }
9117
9118 void
9119 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9120 {
9121         /* formulate and queue a SHUTDOWN to the sender */
9122         struct mbuf *m_shutdown;
9123         struct sctp_shutdown_chunk *shutdown_cp;
9124         struct sctp_tmit_chunk *chk;
9125
9126         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9127         if (m_shutdown == NULL) {
9128                 /* no mbuf's */
9129                 return;
9130         }
9131         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9132         sctp_alloc_a_chunk(stcb, chk);
9133         if (chk == NULL) {
9134                 /* no memory */
9135                 sctp_m_freem(m_shutdown);
9136                 return;
9137         }
9138         chk->copy_by_ref = 0;
9139         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9140         chk->rec.chunk_id.can_take_data = 1;
9141         chk->flags = 0;
9142         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9143         chk->sent = SCTP_DATAGRAM_UNSENT;
9144         chk->snd_count = 0;
9145         chk->flags = 0;
9146         chk->asoc = &stcb->asoc;
9147         chk->data = m_shutdown;
9148         chk->whoTo = net;
9149         if (chk->whoTo) {
9150                 atomic_add_int(&chk->whoTo->ref_count, 1);
9151         }
9152         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9153         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9154         shutdown_cp->ch.chunk_flags = 0;
9155         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9156         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9157         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9158         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9159         chk->asoc->ctrl_queue_cnt++;
9160         return;
9161 }
9162
9163 void
9164 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9165 {
9166         /*
9167          * formulate and queue an ASCONF to the peer. ASCONF parameters
9168          * should be queued on the assoc queue.
9169          */
9170         struct sctp_tmit_chunk *chk;
9171         struct mbuf *m_asconf;
9172         int len;
9173
9174         SCTP_TCB_LOCK_ASSERT(stcb);
9175
9176         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9177             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9178                 /* can't send a new one if there is one in flight already */
9179                 return;
9180         }
9181         /* compose an ASCONF chunk, maximum length is PMTU */
9182         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9183         if (m_asconf == NULL) {
9184                 return;
9185         }
9186         sctp_alloc_a_chunk(stcb, chk);
9187         if (chk == NULL) {
9188                 /* no memory */
9189                 sctp_m_freem(m_asconf);
9190                 return;
9191         }
9192         chk->copy_by_ref = 0;
9193         chk->rec.chunk_id.id = SCTP_ASCONF;
9194         chk->rec.chunk_id.can_take_data = 0;
9195         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9196         chk->data = m_asconf;
9197         chk->send_size = len;
9198         chk->sent = SCTP_DATAGRAM_UNSENT;
9199         chk->snd_count = 0;
9200         chk->asoc = &stcb->asoc;
9201         chk->whoTo = net;
9202         if (chk->whoTo) {
9203                 atomic_add_int(&chk->whoTo->ref_count, 1);
9204         }
9205         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9206         chk->asoc->ctrl_queue_cnt++;
9207         return;
9208 }
9209
9210 void
9211 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9212 {
9213         /*
9214          * formulate and queue a asconf-ack back to sender. the asconf-ack
9215          * must be stored in the tcb.
9216          */
9217         struct sctp_tmit_chunk *chk;
9218         struct sctp_asconf_ack *ack, *latest_ack;
9219         struct mbuf *m_ack;
9220         struct sctp_nets *net = NULL;
9221
9222         SCTP_TCB_LOCK_ASSERT(stcb);
9223         /* Get the latest ASCONF-ACK */
9224         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9225         if (latest_ack == NULL) {
9226                 return;
9227         }
9228         if (latest_ack->last_sent_to != NULL &&
9229             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9230                 /* we're doing a retransmission */
9231                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9232                 if (net == NULL) {
9233                         /* no alternate */
9234                         if (stcb->asoc.last_control_chunk_from == NULL) {
9235                                 if (stcb->asoc.alternate) {
9236                                         net = stcb->asoc.alternate;
9237                                 } else {
9238                                         net = stcb->asoc.primary_destination;
9239                                 }
9240                         } else {
9241                                 net = stcb->asoc.last_control_chunk_from;
9242                         }
9243                 }
9244         } else {
9245                 /* normal case */
9246                 if (stcb->asoc.last_control_chunk_from == NULL) {
9247                         if (stcb->asoc.alternate) {
9248                                 net = stcb->asoc.alternate;
9249                         } else {
9250                                 net = stcb->asoc.primary_destination;
9251                         }
9252                 } else {
9253                         net = stcb->asoc.last_control_chunk_from;
9254                 }
9255         }
9256         latest_ack->last_sent_to = net;
9257
9258         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9259                 if (ack->data == NULL) {
9260                         continue;
9261                 }
9262                 /* copy the asconf_ack */
9263                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9264                 if (m_ack == NULL) {
9265                         /* couldn't copy it */
9266                         return;
9267                 }
9268 #ifdef SCTP_MBUF_LOGGING
9269                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9270                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9271                 }
9272 #endif
9273
9274                 sctp_alloc_a_chunk(stcb, chk);
9275                 if (chk == NULL) {
9276                         /* no memory */
9277                         if (m_ack)
9278                                 sctp_m_freem(m_ack);
9279                         return;
9280                 }
9281                 chk->copy_by_ref = 0;
9282                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9283                 chk->rec.chunk_id.can_take_data = 1;
9284                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9285                 chk->whoTo = net;
9286                 if (chk->whoTo) {
9287                         atomic_add_int(&chk->whoTo->ref_count, 1);
9288                 }
9289                 chk->data = m_ack;
9290                 chk->send_size = ack->len;
9291                 chk->sent = SCTP_DATAGRAM_UNSENT;
9292                 chk->snd_count = 0;
9293                 chk->asoc = &stcb->asoc;
9294
9295                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9296                 chk->asoc->ctrl_queue_cnt++;
9297         }
9298         return;
9299 }
9300
9301
9302 static int
9303 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9304     struct sctp_tcb *stcb,
9305     struct sctp_association *asoc,
9306     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9307 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9308     SCTP_UNUSED
9309 #endif
9310 )
9311 {
9312         /*-
9313          * send out one MTU of retransmission. If fast_retransmit is
9314          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9315          * rwnd. For a Cookie or Asconf in the control chunk queue we
9316          * retransmit them by themselves.
9317          *
9318          * For data chunks we will pick out the lowest TSN's in the sent_queue
9319          * marked for resend and bundle them all together (up to a MTU of
9320          * destination). The address to send to should have been
9321          * selected/changed where the retransmission was marked (i.e. in FR
9322          * or t3-timeout routines).
9323          */
9324         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9325         struct sctp_tmit_chunk *chk, *fwd;
9326         struct mbuf *m, *endofchain;
9327         struct sctp_nets *net = NULL;
9328         uint32_t tsns_sent = 0;
9329         int no_fragmentflg, bundle_at, cnt_thru;
9330         unsigned int mtu;
9331         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9332         struct sctp_auth_chunk *auth = NULL;
9333         uint32_t auth_offset = 0;
9334         uint16_t auth_keyid;
9335         int override_ok = 1;
9336         int data_auth_reqd = 0;
9337         uint32_t dmtu = 0;
9338
9339         SCTP_TCB_LOCK_ASSERT(stcb);
9340         tmr_started = ctl_cnt = bundle_at = error = 0;
9341         no_fragmentflg = 1;
9342         fwd_tsn = 0;
9343         *cnt_out = 0;
9344         fwd = NULL;
9345         endofchain = m = NULL;
9346         auth_keyid = stcb->asoc.authinfo.active_keyid;
9347 #ifdef SCTP_AUDITING_ENABLED
9348         sctp_audit_log(0xC3, 1);
9349 #endif
9350         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9351             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9352                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9353                     asoc->sent_queue_retran_cnt);
9354                 asoc->sent_queue_cnt = 0;
9355                 asoc->sent_queue_cnt_removeable = 0;
9356                 /* send back 0/0 so we enter normal transmission */
9357                 *cnt_out = 0;
9358                 return (0);
9359         }
9360         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9361                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9362                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9363                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9364                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9365                                 continue;
9366                         }
9367                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9368                                 if (chk != asoc->str_reset) {
9369                                         /*
9370                                          * not eligible for retran if its
9371                                          * not ours
9372                                          */
9373                                         continue;
9374                                 }
9375                         }
9376                         ctl_cnt++;
9377                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9378                                 fwd_tsn = 1;
9379                         }
9380                         /*
9381                          * Add an AUTH chunk, if chunk requires it save the
9382                          * offset into the chain for AUTH
9383                          */
9384                         if ((auth == NULL) &&
9385                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9386                             stcb->asoc.peer_auth_chunks))) {
9387                                 m = sctp_add_auth_chunk(m, &endofchain,
9388                                     &auth, &auth_offset,
9389                                     stcb,
9390                                     chk->rec.chunk_id.id);
9391                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9392                         }
9393                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9394                         break;
9395                 }
9396         }
9397         one_chunk = 0;
9398         cnt_thru = 0;
9399         /* do we have control chunks to retransmit? */
9400         if (m != NULL) {
9401                 /* Start a timer no matter if we suceed or fail */
9402                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9403                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9404                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9405                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9406                 chk->snd_count++;       /* update our count */
9407                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9408                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9409                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9410                     no_fragmentflg, 0, 0,
9411                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9412                     chk->whoTo->port, NULL,
9413                     0, 0,
9414                     so_locked))) {
9415                         SCTP_STAT_INCR(sctps_lowlevelerr);
9416                         return (error);
9417                 }
9418                 endofchain = NULL;
9419                 auth = NULL;
9420                 auth_offset = 0;
9421                 /*
9422                  * We don't want to mark the net->sent time here since this
9423                  * we use this for HB and retrans cannot measure RTT
9424                  */
9425                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9426                 *cnt_out += 1;
9427                 chk->sent = SCTP_DATAGRAM_SENT;
9428                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9429                 if (fwd_tsn == 0) {
9430                         return (0);
9431                 } else {
9432                         /* Clean up the fwd-tsn list */
9433                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9434                         return (0);
9435                 }
9436         }
9437         /*
9438          * Ok, it is just data retransmission we need to do or that and a
9439          * fwd-tsn with it all.
9440          */
9441         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9442                 return (SCTP_RETRAN_DONE);
9443         }
9444         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9445             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9446                 /* not yet open, resend the cookie and that is it */
9447                 return (1);
9448         }
9449 #ifdef SCTP_AUDITING_ENABLED
9450         sctp_auditing(20, inp, stcb, NULL);
9451 #endif
9452         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9453         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9454                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9455                         /* No, not sent to this net or not ready for rtx */
9456                         continue;
9457                 }
9458                 if (chk->data == NULL) {
9459                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9460                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9461                         continue;
9462                 }
9463                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9464                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9465                         /* Gak, we have exceeded max unlucky retran, abort! */
9466                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9467                             chk->snd_count,
9468                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9469                         atomic_add_int(&stcb->asoc.refcnt, 1);
9470                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9471                         SCTP_TCB_LOCK(stcb);
9472                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9473                         return (SCTP_RETRAN_EXIT);
9474                 }
9475                 /* pick up the net */
9476                 net = chk->whoTo;
9477                 switch (net->ro._l_addr.sa.sa_family) {
9478 #ifdef INET
9479                 case AF_INET:
9480                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9481                         break;
9482 #endif
9483 #ifdef INET6
9484                 case AF_INET6:
9485                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9486                         break;
9487 #endif
9488                 default:
9489                         /* TSNH */
9490                         mtu = net->mtu;
9491                         break;
9492                 }
9493
9494                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9495                         /* No room in peers rwnd */
9496                         uint32_t tsn;
9497
9498                         tsn = asoc->last_acked_seq + 1;
9499                         if (tsn == chk->rec.data.TSN_seq) {
9500                                 /*
9501                                  * we make a special exception for this
9502                                  * case. The peer has no rwnd but is missing
9503                                  * the lowest chunk.. which is probably what
9504                                  * is holding up the rwnd.
9505                                  */
9506                                 goto one_chunk_around;
9507                         }
9508                         return (1);
9509                 }
9510 one_chunk_around:
9511                 if (asoc->peers_rwnd < mtu) {
9512                         one_chunk = 1;
9513                         if ((asoc->peers_rwnd == 0) &&
9514                             (asoc->total_flight == 0)) {
9515                                 chk->window_probe = 1;
9516                                 chk->whoTo->window_probe = 1;
9517                         }
9518                 }
9519 #ifdef SCTP_AUDITING_ENABLED
9520                 sctp_audit_log(0xC3, 2);
9521 #endif
9522                 bundle_at = 0;
9523                 m = NULL;
9524                 net->fast_retran_ip = 0;
9525                 if (chk->rec.data.doing_fast_retransmit == 0) {
9526                         /*
9527                          * if no FR in progress skip destination that have
9528                          * flight_size > cwnd.
9529                          */
9530                         if (net->flight_size >= net->cwnd) {
9531                                 continue;
9532                         }
9533                 } else {
9534                         /*
9535                          * Mark the destination net to have FR recovery
9536                          * limits put on it.
9537                          */
9538                         *fr_done = 1;
9539                         net->fast_retran_ip = 1;
9540                 }
9541
9542                 /*
9543                  * if no AUTH is yet included and this chunk requires it,
9544                  * make sure to account for it.  We don't apply the size
9545                  * until the AUTH chunk is actually added below in case
9546                  * there is no room for this chunk.
9547                  */
9548                 if (data_auth_reqd && (auth == NULL)) {
9549                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9550                 } else
9551                         dmtu = 0;
9552
9553                 if ((chk->send_size <= (mtu - dmtu)) ||
9554                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9555                         /* ok we will add this one */
9556                         if (data_auth_reqd) {
9557                                 if (auth == NULL) {
9558                                         m = sctp_add_auth_chunk(m,
9559                                             &endofchain,
9560                                             &auth,
9561                                             &auth_offset,
9562                                             stcb,
9563                                             SCTP_DATA);
9564                                         auth_keyid = chk->auth_keyid;
9565                                         override_ok = 0;
9566                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9567                                 } else if (override_ok) {
9568                                         auth_keyid = chk->auth_keyid;
9569                                         override_ok = 0;
9570                                 } else if (chk->auth_keyid != auth_keyid) {
9571                                         /* different keyid, so done bundling */
9572                                         break;
9573                                 }
9574                         }
9575                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9576                         if (m == NULL) {
9577                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9578                                 return (ENOMEM);
9579                         }
9580                         /* Do clear IP_DF ? */
9581                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9582                                 no_fragmentflg = 0;
9583                         }
9584                         /* upate our MTU size */
9585                         if (mtu > (chk->send_size + dmtu))
9586                                 mtu -= (chk->send_size + dmtu);
9587                         else
9588                                 mtu = 0;
9589                         data_list[bundle_at++] = chk;
9590                         if (one_chunk && (asoc->total_flight <= 0)) {
9591                                 SCTP_STAT_INCR(sctps_windowprobed);
9592                         }
9593                 }
9594                 if (one_chunk == 0) {
9595                         /*
9596                          * now are there anymore forward from chk to pick
9597                          * up?
9598                          */
9599                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9600                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9601                                         /* Nope, not for retran */
9602                                         continue;
9603                                 }
9604                                 if (fwd->whoTo != net) {
9605                                         /* Nope, not the net in question */
9606                                         continue;
9607                                 }
9608                                 if (data_auth_reqd && (auth == NULL)) {
9609                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9610                                 } else
9611                                         dmtu = 0;
9612                                 if (fwd->send_size <= (mtu - dmtu)) {
9613                                         if (data_auth_reqd) {
9614                                                 if (auth == NULL) {
9615                                                         m = sctp_add_auth_chunk(m,
9616                                                             &endofchain,
9617                                                             &auth,
9618                                                             &auth_offset,
9619                                                             stcb,
9620                                                             SCTP_DATA);
9621                                                         auth_keyid = fwd->auth_keyid;
9622                                                         override_ok = 0;
9623                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9624                                                 } else if (override_ok) {
9625                                                         auth_keyid = fwd->auth_keyid;
9626                                                         override_ok = 0;
9627                                                 } else if (fwd->auth_keyid != auth_keyid) {
9628                                                         /*
9629                                                          * different keyid,
9630                                                          * so done bundling
9631                                                          */
9632                                                         break;
9633                                                 }
9634                                         }
9635                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9636                                         if (m == NULL) {
9637                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9638                                                 return (ENOMEM);
9639                                         }
9640                                         /* Do clear IP_DF ? */
9641                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9642                                                 no_fragmentflg = 0;
9643                                         }
9644                                         /* upate our MTU size */
9645                                         if (mtu > (fwd->send_size + dmtu))
9646                                                 mtu -= (fwd->send_size + dmtu);
9647                                         else
9648                                                 mtu = 0;
9649                                         data_list[bundle_at++] = fwd;
9650                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9651                                                 break;
9652                                         }
9653                                 } else {
9654                                         /* can't fit so we are done */
9655                                         break;
9656                                 }
9657                         }
9658                 }
9659                 /* Is there something to send for this destination? */
9660                 if (m) {
9661                         /*
9662                          * No matter if we fail/or suceed we should start a
9663                          * timer. A failure is like a lost IP packet :-)
9664                          */
9665                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9666                                 /*
9667                                  * no timer running on this destination
9668                                  * restart it.
9669                                  */
9670                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9671                                 tmr_started = 1;
9672                         }
9673                         /* Now lets send it, if there is anything to send :> */
9674                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9675                             (struct sockaddr *)&net->ro._l_addr, m,
9676                             auth_offset, auth, auth_keyid,
9677                             no_fragmentflg, 0, 0,
9678                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9679                             net->port, NULL,
9680                             0, 0,
9681                             so_locked))) {
9682                                 /* error, we could not output */
9683                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9684                                 return (error);
9685                         }
9686                         endofchain = NULL;
9687                         auth = NULL;
9688                         auth_offset = 0;
9689                         /* For HB's */
9690                         /*
9691                          * We don't want to mark the net->sent time here
9692                          * since this we use this for HB and retrans cannot
9693                          * measure RTT
9694                          */
9695                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9696
9697                         /* For auto-close */
9698                         cnt_thru++;
9699                         if (*now_filled == 0) {
9700                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9701                                 *now = asoc->time_last_sent;
9702                                 *now_filled = 1;
9703                         } else {
9704                                 asoc->time_last_sent = *now;
9705                         }
9706                         *cnt_out += bundle_at;
9707 #ifdef SCTP_AUDITING_ENABLED
9708                         sctp_audit_log(0xC4, bundle_at);
9709 #endif
9710                         if (bundle_at) {
9711                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9712                         }
9713                         for (i = 0; i < bundle_at; i++) {
9714                                 SCTP_STAT_INCR(sctps_sendretransdata);
9715                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9716                                 /*
9717                                  * When we have a revoked data, and we
9718                                  * retransmit it, then we clear the revoked
9719                                  * flag since this flag dictates if we
9720                                  * subtracted from the fs
9721                                  */
9722                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9723                                         /* Deflate the cwnd */
9724                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9725                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9726                                 }
9727                                 data_list[i]->snd_count++;
9728                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9729                                 /* record the time */
9730                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9731                                 if (data_list[i]->book_size_scale) {
9732                                         /*
9733                                          * need to double the book size on
9734                                          * this one
9735                                          */
9736                                         data_list[i]->book_size_scale = 0;
9737                                         /*
9738                                          * Since we double the booksize, we
9739                                          * must also double the output queue
9740                                          * size, since this get shrunk when
9741                                          * we free by this amount.
9742                                          */
9743                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9744                                         data_list[i]->book_size *= 2;
9745
9746
9747                                 } else {
9748                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9749                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9750                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9751                                         }
9752                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9753                                             (uint32_t) (data_list[i]->send_size +
9754                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9755                                 }
9756                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9757                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9758                                             data_list[i]->whoTo->flight_size,
9759                                             data_list[i]->book_size,
9760                                             (uintptr_t) data_list[i]->whoTo,
9761                                             data_list[i]->rec.data.TSN_seq);
9762                                 }
9763                                 sctp_flight_size_increase(data_list[i]);
9764                                 sctp_total_flight_increase(stcb, data_list[i]);
9765                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9766                                         /* SWS sender side engages */
9767                                         asoc->peers_rwnd = 0;
9768                                 }
9769                                 if ((i == 0) &&
9770                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9771                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9772                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9773                                             (tmr_started == 0)) {
9774                                                 /*-
9775                                                  * ok we just fast-retrans'd
9776                                                  * the lowest TSN, i.e the
9777                                                  * first on the list. In
9778                                                  * this case we want to give
9779                                                  * some more time to get a
9780                                                  * SACK back without a
9781                                                  * t3-expiring.
9782                                                  */
9783                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9784                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9785                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9786                                         }
9787                                 }
9788                         }
9789                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9790                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9791                         }
9792 #ifdef SCTP_AUDITING_ENABLED
9793                         sctp_auditing(21, inp, stcb, NULL);
9794 #endif
9795                 } else {
9796                         /* None will fit */
9797                         return (1);
9798                 }
9799                 if (asoc->sent_queue_retran_cnt <= 0) {
9800                         /* all done we have no more to retran */
9801                         asoc->sent_queue_retran_cnt = 0;
9802                         break;
9803                 }
9804                 if (one_chunk) {
9805                         /* No more room in rwnd */
9806                         return (1);
9807                 }
9808                 /* stop the for loop here. we sent out a packet */
9809                 break;
9810         }
9811         return (0);
9812 }
9813
9814 static void
9815 sctp_timer_validation(struct sctp_inpcb *inp,
9816     struct sctp_tcb *stcb,
9817     struct sctp_association *asoc)
9818 {
9819         struct sctp_nets *net;
9820
9821         /* Validate that a timer is running somewhere */
9822         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9823                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9824                         /* Here is a timer */
9825                         return;
9826                 }
9827         }
9828         SCTP_TCB_LOCK_ASSERT(stcb);
9829         /* Gak, we did not have a timer somewhere */
9830         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9831         if (asoc->alternate) {
9832                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9833         } else {
9834                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9835         }
9836         return;
9837 }
9838
9839 void
9840 sctp_chunk_output(struct sctp_inpcb *inp,
9841     struct sctp_tcb *stcb,
9842     int from_where,
9843     int so_locked
9844 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9845     SCTP_UNUSED
9846 #endif
9847 )
9848 {
9849         /*-
9850          * Ok this is the generic chunk service queue. we must do the
9851          * following:
9852          * - See if there are retransmits pending, if so we must
9853          *   do these first.
9854          * - Service the stream queue that is next, moving any
9855          *   message (note I must get a complete message i.e.
9856          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9857          *   TSN's
9858          * - Check to see if the cwnd/rwnd allows any output, if so we
9859          *   go ahead and fomulate and send the low level chunks. Making sure
9860          *   to combine any control in the control chunk queue also.
9861          */
9862         struct sctp_association *asoc;
9863         struct sctp_nets *net;
9864         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9865         unsigned int burst_cnt = 0;
9866         struct timeval now;
9867         int now_filled = 0;
9868         int nagle_on;
9869         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9870         int un_sent = 0;
9871         int fr_done;
9872         unsigned int tot_frs = 0;
9873
9874         asoc = &stcb->asoc;
9875         /* The Nagle algorithm is only applied when handling a send call. */
9876         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9877                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9878                         nagle_on = 0;
9879                 } else {
9880                         nagle_on = 1;
9881                 }
9882         } else {
9883                 nagle_on = 0;
9884         }
9885         SCTP_TCB_LOCK_ASSERT(stcb);
9886
9887         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9888
9889         if ((un_sent <= 0) &&
9890             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9891             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9892             (asoc->sent_queue_retran_cnt == 0)) {
9893                 /* Nothing to do unless there is something to be sent left */
9894                 return;
9895         }
9896         /*
9897          * Do we have something to send, data or control AND a sack timer
9898          * running, if so piggy-back the sack.
9899          */
9900         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9901                 sctp_send_sack(stcb, so_locked);
9902                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9903         }
9904         while (asoc->sent_queue_retran_cnt) {
9905                 /*-
9906                  * Ok, it is retransmission time only, we send out only ONE
9907                  * packet with a single call off to the retran code.
9908                  */
9909                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9910                         /*-
9911                          * Special hook for handling cookiess discarded
9912                          * by peer that carried data. Send cookie-ack only
9913                          * and then the next call with get the retran's.
9914                          */
9915                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9916                             from_where,
9917                             &now, &now_filled, frag_point, so_locked);
9918                         return;
9919                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9920                         /* if its not from a HB then do it */
9921                         fr_done = 0;
9922                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9923                         if (fr_done) {
9924                                 tot_frs++;
9925                         }
9926                 } else {
9927                         /*
9928                          * its from any other place, we don't allow retran
9929                          * output (only control)
9930                          */
9931                         ret = 1;
9932                 }
9933                 if (ret > 0) {
9934                         /* Can't send anymore */
9935                         /*-
9936                          * now lets push out control by calling med-level
9937                          * output once. this assures that we WILL send HB's
9938                          * if queued too.
9939                          */
9940                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9941                             from_where,
9942                             &now, &now_filled, frag_point, so_locked);
9943 #ifdef SCTP_AUDITING_ENABLED
9944                         sctp_auditing(8, inp, stcb, NULL);
9945 #endif
9946                         sctp_timer_validation(inp, stcb, asoc);
9947                         return;
9948                 }
9949                 if (ret < 0) {
9950                         /*-
9951                          * The count was off.. retran is not happening so do
9952                          * the normal retransmission.
9953                          */
9954 #ifdef SCTP_AUDITING_ENABLED
9955                         sctp_auditing(9, inp, stcb, NULL);
9956 #endif
9957                         if (ret == SCTP_RETRAN_EXIT) {
9958                                 return;
9959                         }
9960                         break;
9961                 }
9962                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9963                         /* Only one transmission allowed out of a timeout */
9964 #ifdef SCTP_AUDITING_ENABLED
9965                         sctp_auditing(10, inp, stcb, NULL);
9966 #endif
9967                         /* Push out any control */
9968                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9969                             &now, &now_filled, frag_point, so_locked);
9970                         return;
9971                 }
9972                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9973                         /* Hit FR burst limit */
9974                         return;
9975                 }
9976                 if ((num_out == 0) && (ret == 0)) {
9977                         /* No more retrans to send */
9978                         break;
9979                 }
9980         }
9981 #ifdef SCTP_AUDITING_ENABLED
9982         sctp_auditing(12, inp, stcb, NULL);
9983 #endif
9984         /* Check for bad destinations, if they exist move chunks around. */
9985         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9986                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9987                         /*-
9988                          * if possible move things off of this address we
9989                          * still may send below due to the dormant state but
9990                          * we try to find an alternate address to send to
9991                          * and if we have one we move all queued data on the
9992                          * out wheel to this alternate address.
9993                          */
9994                         if (net->ref_count > 1)
9995                                 sctp_move_chunks_from_net(stcb, net);
9996                 } else {
9997                         /*-
9998                          * if ((asoc->sat_network) || (net->addr_is_local))
9999                          * { burst_limit = asoc->max_burst *
10000                          * SCTP_SAT_NETWORK_BURST_INCR; }
10001                          */
10002                         if (asoc->max_burst > 0) {
10003                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10004                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10005                                                 /*
10006                                                  * JRS - Use the congestion
10007                                                  * control given in the
10008                                                  * congestion control module
10009                                                  */
10010                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10011                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10012                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10013                                                 }
10014                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10015                                         }
10016                                         net->fast_retran_ip = 0;
10017                                 } else {
10018                                         if (net->flight_size == 0) {
10019                                                 /*
10020                                                  * Should be decaying the
10021                                                  * cwnd here
10022                                                  */
10023                                                 ;
10024                                         }
10025                                 }
10026                         }
10027                 }
10028
10029         }
10030         burst_cnt = 0;
10031         do {
10032                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10033                     &reason_code, 0, from_where,
10034                     &now, &now_filled, frag_point, so_locked);
10035                 if (error) {
10036                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10037                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10038                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10039                         }
10040                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10041                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10042                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10043                         }
10044                         break;
10045                 }
10046                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10047
10048                 tot_out += num_out;
10049                 burst_cnt++;
10050                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10051                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10052                         if (num_out == 0) {
10053                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10054                         }
10055                 }
10056                 if (nagle_on) {
10057                         /*
10058                          * When the Nagle algorithm is used, look at how
10059                          * much is unsent, then if its smaller than an MTU
10060                          * and we have data in flight we stop, except if we
10061                          * are handling a fragmented user message.
10062                          */
10063                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10064                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10065                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10066                             (stcb->asoc.total_flight > 0) &&
10067                             ((stcb->asoc.locked_on_sending == NULL) ||
10068                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10069                                 break;
10070                         }
10071                 }
10072                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10073                     TAILQ_EMPTY(&asoc->send_queue) &&
10074                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10075                         /* Nothing left to send */
10076                         break;
10077                 }
10078                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10079                         /* Nothing left to send */
10080                         break;
10081                 }
10082         } while (num_out &&
10083             ((asoc->max_burst == 0) ||
10084             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10085             (burst_cnt < asoc->max_burst)));
10086
10087         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10088                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10089                         SCTP_STAT_INCR(sctps_maxburstqueued);
10090                         asoc->burst_limit_applied = 1;
10091                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10092                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10093                         }
10094                 } else {
10095                         asoc->burst_limit_applied = 0;
10096                 }
10097         }
10098         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10099                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10100         }
10101         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10102             tot_out);
10103
10104         /*-
10105          * Now we need to clean up the control chunk chain if a ECNE is on
10106          * it. It must be marked as UNSENT again so next call will continue
10107          * to send it until such time that we get a CWR, to remove it.
10108          */
10109         if (stcb->asoc.ecn_echo_cnt_onq)
10110                 sctp_fix_ecn_echo(asoc);
10111         return;
10112 }
10113
10114
10115 int
10116 sctp_output(
10117     struct sctp_inpcb *inp,
10118     struct mbuf *m,
10119     struct sockaddr *addr,
10120     struct mbuf *control,
10121     struct thread *p,
10122     int flags)
10123 {
10124         if (inp == NULL) {
10125                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10126                 return (EINVAL);
10127         }
10128         if (inp->sctp_socket == NULL) {
10129                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10130                 return (EINVAL);
10131         }
10132         return (sctp_sosend(inp->sctp_socket,
10133             addr,
10134             (struct uio *)NULL,
10135             m,
10136             control,
10137             flags, p
10138             ));
10139 }
10140
10141 void
10142 send_forward_tsn(struct sctp_tcb *stcb,
10143     struct sctp_association *asoc)
10144 {
10145         struct sctp_tmit_chunk *chk;
10146         struct sctp_forward_tsn_chunk *fwdtsn;
10147         uint32_t advance_peer_ack_point;
10148
10149         SCTP_TCB_LOCK_ASSERT(stcb);
10150         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10151                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10152                         /* mark it to unsent */
10153                         chk->sent = SCTP_DATAGRAM_UNSENT;
10154                         chk->snd_count = 0;
10155                         /* Do we correct its output location? */
10156                         if (chk->whoTo) {
10157                                 sctp_free_remote_addr(chk->whoTo);
10158                                 chk->whoTo = NULL;
10159                         }
10160                         goto sctp_fill_in_rest;
10161                 }
10162         }
10163         /* Ok if we reach here we must build one */
10164         sctp_alloc_a_chunk(stcb, chk);
10165         if (chk == NULL) {
10166                 return;
10167         }
10168         asoc->fwd_tsn_cnt++;
10169         chk->copy_by_ref = 0;
10170         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10171         chk->rec.chunk_id.can_take_data = 0;
10172         chk->flags = 0;
10173         chk->asoc = asoc;
10174         chk->whoTo = NULL;
10175         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10176         if (chk->data == NULL) {
10177                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10178                 return;
10179         }
10180         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10181         chk->sent = SCTP_DATAGRAM_UNSENT;
10182         chk->snd_count = 0;
10183         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10184         asoc->ctrl_queue_cnt++;
10185 sctp_fill_in_rest:
10186         /*-
10187          * Here we go through and fill out the part that deals with
10188          * stream/seq of the ones we skip.
10189          */
10190         SCTP_BUF_LEN(chk->data) = 0;
10191         {
10192                 struct sctp_tmit_chunk *at, *tp1, *last;
10193                 struct sctp_strseq *strseq;
10194                 unsigned int cnt_of_space, i, ovh;
10195                 unsigned int space_needed;
10196                 unsigned int cnt_of_skipped = 0;
10197
10198                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10199                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10200                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10201                                 /* no more to look at */
10202                                 break;
10203                         }
10204                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10205                                 /* We don't report these */
10206                                 continue;
10207                         }
10208                         cnt_of_skipped++;
10209                 }
10210                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10211                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10212
10213                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10214
10215                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10216                         ovh = SCTP_MIN_OVERHEAD;
10217                 } else {
10218                         ovh = SCTP_MIN_V4_OVERHEAD;
10219                 }
10220                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10221                         /* trim to a mtu size */
10222                         cnt_of_space = asoc->smallest_mtu - ovh;
10223                 }
10224                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10225                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10226                             0xff, 0, cnt_of_skipped,
10227                             asoc->advanced_peer_ack_point);
10228
10229                 }
10230                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10231                 if (cnt_of_space < space_needed) {
10232                         /*-
10233                          * ok we must trim down the chunk by lowering the
10234                          * advance peer ack point.
10235                          */
10236                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10237                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10238                                     0xff, 0xff, cnt_of_space,
10239                                     space_needed);
10240                         }
10241                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10242                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10243                         /*-
10244                          * Go through and find the TSN that will be the one
10245                          * we report.
10246                          */
10247                         at = TAILQ_FIRST(&asoc->sent_queue);
10248                         if (at != NULL) {
10249                                 for (i = 0; i < cnt_of_skipped; i++) {
10250                                         tp1 = TAILQ_NEXT(at, sctp_next);
10251                                         if (tp1 == NULL) {
10252                                                 break;
10253                                         }
10254                                         at = tp1;
10255                                 }
10256                         }
10257                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10258                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10259                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10260                                     asoc->advanced_peer_ack_point);
10261                         }
10262                         last = at;
10263                         /*-
10264                          * last now points to last one I can report, update
10265                          * peer ack point
10266                          */
10267                         if (last)
10268                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10269                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10270                             cnt_of_skipped * sizeof(struct sctp_strseq);
10271                 }
10272                 chk->send_size = space_needed;
10273                 /* Setup the chunk */
10274                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10275                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10276                 fwdtsn->ch.chunk_flags = 0;
10277                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10278                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10279                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10280                 fwdtsn++;
10281                 /*-
10282                  * Move pointer to after the fwdtsn and transfer to the
10283                  * strseq pointer.
10284                  */
10285                 strseq = (struct sctp_strseq *)fwdtsn;
10286                 /*-
10287                  * Now populate the strseq list. This is done blindly
10288                  * without pulling out duplicate stream info. This is
10289                  * inefficent but won't harm the process since the peer will
10290                  * look at these in sequence and will thus release anything.
10291                  * It could mean we exceed the PMTU and chop off some that
10292                  * we could have included.. but this is unlikely (aka 1432/4
10293                  * would mean 300+ stream seq's would have to be reported in
10294                  * one FWD-TSN. With a bit of work we can later FIX this to
10295                  * optimize and pull out duplcates.. but it does add more
10296                  * overhead. So for now... not!
10297                  */
10298                 at = TAILQ_FIRST(&asoc->sent_queue);
10299                 for (i = 0; i < cnt_of_skipped; i++) {
10300                         tp1 = TAILQ_NEXT(at, sctp_next);
10301                         if (tp1 == NULL)
10302                                 break;
10303                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10304                                 /* We don't report these */
10305                                 i--;
10306                                 at = tp1;
10307                                 continue;
10308                         }
10309                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10310                                 at->rec.data.fwd_tsn_cnt = 0;
10311                         }
10312                         strseq->stream = ntohs(at->rec.data.stream_number);
10313                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10314                         strseq++;
10315                         at = tp1;
10316                 }
10317         }
10318         return;
10319 }
10320
10321 void
10322 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10323 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10324     SCTP_UNUSED
10325 #endif
10326 )
10327 {
10328         /*-
10329          * Queue up a SACK or NR-SACK in the control queue.
10330          * We must first check to see if a SACK or NR-SACK is
10331          * somehow on the control queue.
10332          * If so, we will take and and remove the old one.
10333          */
10334         struct sctp_association *asoc;
10335         struct sctp_tmit_chunk *chk, *a_chk;
10336         struct sctp_sack_chunk *sack;
10337         struct sctp_nr_sack_chunk *nr_sack;
10338         struct sctp_gap_ack_block *gap_descriptor;
10339         struct sack_track *selector;
10340         int mergeable = 0;
10341         int offset;
10342         caddr_t limit;
10343         uint32_t *dup;
10344         int limit_reached = 0;
10345         unsigned int i, siz, j;
10346         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10347         int num_dups = 0;
10348         int space_req;
10349         uint32_t highest_tsn;
10350         uint8_t flags;
10351         uint8_t type;
10352         uint8_t tsn_map;
10353
10354         if (stcb->asoc.nrsack_supported == 1) {
10355                 type = SCTP_NR_SELECTIVE_ACK;
10356         } else {
10357                 type = SCTP_SELECTIVE_ACK;
10358         }
10359         a_chk = NULL;
10360         asoc = &stcb->asoc;
10361         SCTP_TCB_LOCK_ASSERT(stcb);
10362         if (asoc->last_data_chunk_from == NULL) {
10363                 /* Hmm we never received anything */
10364                 return;
10365         }
10366         sctp_slide_mapping_arrays(stcb);
10367         sctp_set_rwnd(stcb, asoc);
10368         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10369                 if (chk->rec.chunk_id.id == type) {
10370                         /* Hmm, found a sack already on queue, remove it */
10371                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10372                         asoc->ctrl_queue_cnt--;
10373                         a_chk = chk;
10374                         if (a_chk->data) {
10375                                 sctp_m_freem(a_chk->data);
10376                                 a_chk->data = NULL;
10377                         }
10378                         if (a_chk->whoTo) {
10379                                 sctp_free_remote_addr(a_chk->whoTo);
10380                                 a_chk->whoTo = NULL;
10381                         }
10382                         break;
10383                 }
10384         }
10385         if (a_chk == NULL) {
10386                 sctp_alloc_a_chunk(stcb, a_chk);
10387                 if (a_chk == NULL) {
10388                         /* No memory so we drop the idea, and set a timer */
10389                         if (stcb->asoc.delayed_ack) {
10390                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10391                                     stcb->sctp_ep, stcb, NULL,
10392                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10393                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10394                                     stcb->sctp_ep, stcb, NULL);
10395                         } else {
10396                                 stcb->asoc.send_sack = 1;
10397                         }
10398                         return;
10399                 }
10400                 a_chk->copy_by_ref = 0;
10401                 a_chk->rec.chunk_id.id = type;
10402                 a_chk->rec.chunk_id.can_take_data = 1;
10403         }
10404         /* Clear our pkt counts */
10405         asoc->data_pkts_seen = 0;
10406
10407         a_chk->flags = 0;
10408         a_chk->asoc = asoc;
10409         a_chk->snd_count = 0;
10410         a_chk->send_size = 0;   /* fill in later */
10411         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10412         a_chk->whoTo = NULL;
10413
10414         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10415                 /*-
10416                  * Ok, the destination for the SACK is unreachable, lets see if
10417                  * we can select an alternate to asoc->last_data_chunk_from
10418                  */
10419                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10420                 if (a_chk->whoTo == NULL) {
10421                         /* Nope, no alternate */
10422                         a_chk->whoTo = asoc->last_data_chunk_from;
10423                 }
10424         } else {
10425                 a_chk->whoTo = asoc->last_data_chunk_from;
10426         }
10427         if (a_chk->whoTo) {
10428                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10429         }
10430         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10431                 highest_tsn = asoc->highest_tsn_inside_map;
10432         } else {
10433                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10434         }
10435         if (highest_tsn == asoc->cumulative_tsn) {
10436                 /* no gaps */
10437                 if (type == SCTP_SELECTIVE_ACK) {
10438                         space_req = sizeof(struct sctp_sack_chunk);
10439                 } else {
10440                         space_req = sizeof(struct sctp_nr_sack_chunk);
10441                 }
10442         } else {
10443                 /* gaps get a cluster */
10444                 space_req = MCLBYTES;
10445         }
10446         /* Ok now lets formulate a MBUF with our sack */
10447         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10448         if ((a_chk->data == NULL) ||
10449             (a_chk->whoTo == NULL)) {
10450                 /* rats, no mbuf memory */
10451                 if (a_chk->data) {
10452                         /* was a problem with the destination */
10453                         sctp_m_freem(a_chk->data);
10454                         a_chk->data = NULL;
10455                 }
10456                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10457                 /* sa_ignore NO_NULL_CHK */
10458                 if (stcb->asoc.delayed_ack) {
10459                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10460                             stcb->sctp_ep, stcb, NULL,
10461                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10462                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10463                             stcb->sctp_ep, stcb, NULL);
10464                 } else {
10465                         stcb->asoc.send_sack = 1;
10466                 }
10467                 return;
10468         }
10469         /* ok, lets go through and fill it in */
10470         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10471         space = M_TRAILINGSPACE(a_chk->data);
10472         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10473                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10474         }
10475         limit = mtod(a_chk->data, caddr_t);
10476         limit += space;
10477
10478         flags = 0;
10479
10480         if ((asoc->sctp_cmt_on_off > 0) &&
10481             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10482                 /*-
10483                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10484                  * received, then set high bit to 1, else 0. Reset
10485                  * pkts_rcvd.
10486                  */
10487                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10488                 asoc->cmt_dac_pkts_rcvd = 0;
10489         }
10490 #ifdef SCTP_ASOCLOG_OF_TSNS
10491         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10492         stcb->asoc.cumack_log_atsnt++;
10493         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10494                 stcb->asoc.cumack_log_atsnt = 0;
10495         }
10496 #endif
10497         /* reset the readers interpretation */
10498         stcb->freed_by_sorcv_sincelast = 0;
10499
10500         if (type == SCTP_SELECTIVE_ACK) {
10501                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10502                 nr_sack = NULL;
10503                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10504                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10505                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10506                 } else {
10507                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10508                 }
10509         } else {
10510                 sack = NULL;
10511                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10512                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10513                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10514                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10515                 } else {
10516                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10517                 }
10518         }
10519
10520         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10521                 offset = 1;
10522         } else {
10523                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10524         }
10525         if (((type == SCTP_SELECTIVE_ACK) &&
10526             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10527             ((type == SCTP_NR_SELECTIVE_ACK) &&
10528             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10529                 /* we have a gap .. maybe */
10530                 for (i = 0; i < siz; i++) {
10531                         tsn_map = asoc->mapping_array[i];
10532                         if (type == SCTP_SELECTIVE_ACK) {
10533                                 tsn_map |= asoc->nr_mapping_array[i];
10534                         }
10535                         if (i == 0) {
10536                                 /*
10537                                  * Clear all bits corresponding to TSNs
10538                                  * smaller or equal to the cumulative TSN.
10539                                  */
10540                                 tsn_map &= (~0 << (1 - offset));
10541                         }
10542                         selector = &sack_array[tsn_map];
10543                         if (mergeable && selector->right_edge) {
10544                                 /*
10545                                  * Backup, left and right edges were ok to
10546                                  * merge.
10547                                  */
10548                                 num_gap_blocks--;
10549                                 gap_descriptor--;
10550                         }
10551                         if (selector->num_entries == 0)
10552                                 mergeable = 0;
10553                         else {
10554                                 for (j = 0; j < selector->num_entries; j++) {
10555                                         if (mergeable && selector->right_edge) {
10556                                                 /*
10557                                                  * do a merge by NOT setting
10558                                                  * the left side
10559                                                  */
10560                                                 mergeable = 0;
10561                                         } else {
10562                                                 /*
10563                                                  * no merge, set the left
10564                                                  * side
10565                                                  */
10566                                                 mergeable = 0;
10567                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10568                                         }
10569                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10570                                         num_gap_blocks++;
10571                                         gap_descriptor++;
10572                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10573                                                 /* no more room */
10574                                                 limit_reached = 1;
10575                                                 break;
10576                                         }
10577                                 }
10578                                 if (selector->left_edge) {
10579                                         mergeable = 1;
10580                                 }
10581                         }
10582                         if (limit_reached) {
10583                                 /* Reached the limit stop */
10584                                 break;
10585                         }
10586                         offset += 8;
10587                 }
10588         }
10589         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10590             (limit_reached == 0)) {
10591
10592                 mergeable = 0;
10593
10594                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10595                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10596                 } else {
10597                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10598                 }
10599
10600                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10601                         offset = 1;
10602                 } else {
10603                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10604                 }
10605                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10606                         /* we have a gap .. maybe */
10607                         for (i = 0; i < siz; i++) {
10608                                 tsn_map = asoc->nr_mapping_array[i];
10609                                 if (i == 0) {
10610                                         /*
10611                                          * Clear all bits corresponding to
10612                                          * TSNs smaller or equal to the
10613                                          * cumulative TSN.
10614                                          */
10615                                         tsn_map &= (~0 << (1 - offset));
10616                                 }
10617                                 selector = &sack_array[tsn_map];
10618                                 if (mergeable && selector->right_edge) {
10619                                         /*
10620                                          * Backup, left and right edges were
10621                                          * ok to merge.
10622                                          */
10623                                         num_nr_gap_blocks--;
10624                                         gap_descriptor--;
10625                                 }
10626                                 if (selector->num_entries == 0)
10627                                         mergeable = 0;
10628                                 else {
10629                                         for (j = 0; j < selector->num_entries; j++) {
10630                                                 if (mergeable && selector->right_edge) {
10631                                                         /*
10632                                                          * do a merge by NOT
10633                                                          * setting the left
10634                                                          * side
10635                                                          */
10636                                                         mergeable = 0;
10637                                                 } else {
10638                                                         /*
10639                                                          * no merge, set the
10640                                                          * left side
10641                                                          */
10642                                                         mergeable = 0;
10643                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10644                                                 }
10645                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10646                                                 num_nr_gap_blocks++;
10647                                                 gap_descriptor++;
10648                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10649                                                         /* no more room */
10650                                                         limit_reached = 1;
10651                                                         break;
10652                                                 }
10653                                         }
10654                                         if (selector->left_edge) {
10655                                                 mergeable = 1;
10656                                         }
10657                                 }
10658                                 if (limit_reached) {
10659                                         /* Reached the limit stop */
10660                                         break;
10661                                 }
10662                                 offset += 8;
10663                         }
10664                 }
10665         }
10666         /* now we must add any dups we are going to report. */
10667         if ((limit_reached == 0) && (asoc->numduptsns)) {
10668                 dup = (uint32_t *) gap_descriptor;
10669                 for (i = 0; i < asoc->numduptsns; i++) {
10670                         *dup = htonl(asoc->dup_tsns[i]);
10671                         dup++;
10672                         num_dups++;
10673                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10674                                 /* no more room */
10675                                 break;
10676                         }
10677                 }
10678                 asoc->numduptsns = 0;
10679         }
10680         /*
10681          * now that the chunk is prepared queue it to the control chunk
10682          * queue.
10683          */
10684         if (type == SCTP_SELECTIVE_ACK) {
10685                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10686                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10687                     num_dups * sizeof(int32_t);
10688                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10689                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10690                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10691                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10692                 sack->sack.num_dup_tsns = htons(num_dups);
10693                 sack->ch.chunk_type = type;
10694                 sack->ch.chunk_flags = flags;
10695                 sack->ch.chunk_length = htons(a_chk->send_size);
10696         } else {
10697                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10698                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10699                     num_dups * sizeof(int32_t);
10700                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10701                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10702                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10703                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10704                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10705                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10706                 nr_sack->nr_sack.reserved = 0;
10707                 nr_sack->ch.chunk_type = type;
10708                 nr_sack->ch.chunk_flags = flags;
10709                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10710         }
10711         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10712         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10713         asoc->ctrl_queue_cnt++;
10714         asoc->send_sack = 0;
10715         SCTP_STAT_INCR(sctps_sendsacks);
10716         return;
10717 }
10718
10719 void
10720 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10721 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10722     SCTP_UNUSED
10723 #endif
10724 )
10725 {
10726         struct mbuf *m_abort, *m, *m_last;
10727         struct mbuf *m_out, *m_end = NULL;
10728         struct sctp_abort_chunk *abort;
10729         struct sctp_auth_chunk *auth = NULL;
10730         struct sctp_nets *net;
10731         uint32_t vtag;
10732         uint32_t auth_offset = 0;
10733         uint16_t cause_len, chunk_len, padding_len;
10734
10735         SCTP_TCB_LOCK_ASSERT(stcb);
10736         /*-
10737          * Add an AUTH chunk, if chunk requires it and save the offset into
10738          * the chain for AUTH
10739          */
10740         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10741             stcb->asoc.peer_auth_chunks)) {
10742                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10743                     stcb, SCTP_ABORT_ASSOCIATION);
10744                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10745         } else {
10746                 m_out = NULL;
10747         }
10748         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10749         if (m_abort == NULL) {
10750                 if (m_out) {
10751                         sctp_m_freem(m_out);
10752                 }
10753                 if (operr) {
10754                         sctp_m_freem(operr);
10755                 }
10756                 return;
10757         }
10758         /* link in any error */
10759         SCTP_BUF_NEXT(m_abort) = operr;
10760         cause_len = 0;
10761         m_last = NULL;
10762         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10763                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10764                 if (SCTP_BUF_NEXT(m) == NULL) {
10765                         m_last = m;
10766                 }
10767         }
10768         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10769         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10770         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10771         if (m_out == NULL) {
10772                 /* NO Auth chunk prepended, so reserve space in front */
10773                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10774                 m_out = m_abort;
10775         } else {
10776                 /* Put AUTH chunk at the front of the chain */
10777                 SCTP_BUF_NEXT(m_end) = m_abort;
10778         }
10779         if (stcb->asoc.alternate) {
10780                 net = stcb->asoc.alternate;
10781         } else {
10782                 net = stcb->asoc.primary_destination;
10783         }
10784         /* Fill in the ABORT chunk header. */
10785         abort = mtod(m_abort, struct sctp_abort_chunk *);
10786         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10787         if (stcb->asoc.peer_vtag == 0) {
10788                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10789                 vtag = stcb->asoc.my_vtag;
10790                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10791         } else {
10792                 vtag = stcb->asoc.peer_vtag;
10793                 abort->ch.chunk_flags = 0;
10794         }
10795         abort->ch.chunk_length = htons(chunk_len);
10796         /* Add padding, if necessary. */
10797         if (padding_len > 0) {
10798                 if ((m_last == NULL) ||
10799                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10800                         sctp_m_freem(m_out);
10801                         return;
10802                 }
10803         }
10804         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10805             (struct sockaddr *)&net->ro._l_addr,
10806             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10807             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10808             stcb->asoc.primary_destination->port, NULL,
10809             0, 0,
10810             so_locked);
10811         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10812 }
10813
10814 void
10815 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10816     struct sctp_nets *net,
10817     int reflect_vtag)
10818 {
10819         /* formulate and SEND a SHUTDOWN-COMPLETE */
10820         struct mbuf *m_shutdown_comp;
10821         struct sctp_shutdown_complete_chunk *shutdown_complete;
10822         uint32_t vtag;
10823         uint8_t flags;
10824
10825         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10826         if (m_shutdown_comp == NULL) {
10827                 /* no mbuf's */
10828                 return;
10829         }
10830         if (reflect_vtag) {
10831                 flags = SCTP_HAD_NO_TCB;
10832                 vtag = stcb->asoc.my_vtag;
10833         } else {
10834                 flags = 0;
10835                 vtag = stcb->asoc.peer_vtag;
10836         }
10837         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10838         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10839         shutdown_complete->ch.chunk_flags = flags;
10840         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10841         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10842         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10843             (struct sockaddr *)&net->ro._l_addr,
10844             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10845             stcb->sctp_ep->sctp_lport, stcb->rport,
10846             htonl(vtag),
10847             net->port, NULL,
10848             0, 0,
10849             SCTP_SO_NOT_LOCKED);
10850         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10851         return;
10852 }
10853
10854 static void
10855 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10856     struct sctphdr *sh, uint32_t vtag,
10857     uint8_t type, struct mbuf *cause,
10858     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10859     uint32_t vrf_id, uint16_t port)
10860 {
10861         struct mbuf *o_pak;
10862         struct mbuf *mout;
10863         struct sctphdr *shout;
10864         struct sctp_chunkhdr *ch;
10865
10866 #if defined(INET) || defined(INET6)
10867         struct udphdr *udp;
10868         int ret;
10869
10870 #endif
10871         int len, cause_len, padding_len;
10872
10873 #ifdef INET
10874         struct sockaddr_in *src_sin, *dst_sin;
10875         struct ip *ip;
10876
10877 #endif
10878 #ifdef INET6
10879         struct sockaddr_in6 *src_sin6, *dst_sin6;
10880         struct ip6_hdr *ip6;
10881
10882 #endif
10883
10884         /* Compute the length of the cause and add final padding. */
10885         cause_len = 0;
10886         if (cause != NULL) {
10887                 struct mbuf *m_at, *m_last = NULL;
10888
10889                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10890                         if (SCTP_BUF_NEXT(m_at) == NULL)
10891                                 m_last = m_at;
10892                         cause_len += SCTP_BUF_LEN(m_at);
10893                 }
10894                 padding_len = cause_len % 4;
10895                 if (padding_len != 0) {
10896                         padding_len = 4 - padding_len;
10897                 }
10898                 if (padding_len != 0) {
10899                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10900                                 sctp_m_freem(cause);
10901                                 return;
10902                         }
10903                 }
10904         } else {
10905                 padding_len = 0;
10906         }
10907         /* Get an mbuf for the header. */
10908         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10909         switch (dst->sa_family) {
10910 #ifdef INET
10911         case AF_INET:
10912                 len += sizeof(struct ip);
10913                 break;
10914 #endif
10915 #ifdef INET6
10916         case AF_INET6:
10917                 len += sizeof(struct ip6_hdr);
10918                 break;
10919 #endif
10920         default:
10921                 break;
10922         }
10923 #if defined(INET) || defined(INET6)
10924         if (port) {
10925                 len += sizeof(struct udphdr);
10926         }
10927 #endif
10928         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
10929         if (mout == NULL) {
10930                 if (cause) {
10931                         sctp_m_freem(cause);
10932                 }
10933                 return;
10934         }
10935         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10936         SCTP_BUF_LEN(mout) = len;
10937         SCTP_BUF_NEXT(mout) = cause;
10938         M_SETFIB(mout, fibnum);
10939         mout->m_pkthdr.flowid = mflowid;
10940         M_HASHTYPE_SET(mout, mflowtype);
10941 #ifdef INET
10942         ip = NULL;
10943 #endif
10944 #ifdef INET6
10945         ip6 = NULL;
10946 #endif
10947         switch (dst->sa_family) {
10948 #ifdef INET
10949         case AF_INET:
10950                 src_sin = (struct sockaddr_in *)src;
10951                 dst_sin = (struct sockaddr_in *)dst;
10952                 ip = mtod(mout, struct ip *);
10953                 ip->ip_v = IPVERSION;
10954                 ip->ip_hl = (sizeof(struct ip) >> 2);
10955                 ip->ip_tos = 0;
10956                 ip->ip_id = ip_newid();
10957                 ip->ip_off = 0;
10958                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10959                 if (port) {
10960                         ip->ip_p = IPPROTO_UDP;
10961                 } else {
10962                         ip->ip_p = IPPROTO_SCTP;
10963                 }
10964                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10965                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10966                 ip->ip_sum = 0;
10967                 len = sizeof(struct ip);
10968                 shout = (struct sctphdr *)((caddr_t)ip + len);
10969                 break;
10970 #endif
10971 #ifdef INET6
10972         case AF_INET6:
10973                 src_sin6 = (struct sockaddr_in6 *)src;
10974                 dst_sin6 = (struct sockaddr_in6 *)dst;
10975                 ip6 = mtod(mout, struct ip6_hdr *);
10976                 ip6->ip6_flow = htonl(0x60000000);
10977                 if (V_ip6_auto_flowlabel) {
10978                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10979                 }
10980                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10981                 if (port) {
10982                         ip6->ip6_nxt = IPPROTO_UDP;
10983                 } else {
10984                         ip6->ip6_nxt = IPPROTO_SCTP;
10985                 }
10986                 ip6->ip6_src = dst_sin6->sin6_addr;
10987                 ip6->ip6_dst = src_sin6->sin6_addr;
10988                 len = sizeof(struct ip6_hdr);
10989                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10990                 break;
10991 #endif
10992         default:
10993                 len = 0;
10994                 shout = mtod(mout, struct sctphdr *);
10995                 break;
10996         }
10997 #if defined(INET) || defined(INET6)
10998         if (port) {
10999                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11000                         sctp_m_freem(mout);
11001                         return;
11002                 }
11003                 udp = (struct udphdr *)shout;
11004                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11005                 udp->uh_dport = port;
11006                 udp->uh_sum = 0;
11007                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11008                     sizeof(struct sctphdr) +
11009                     sizeof(struct sctp_chunkhdr) +
11010                     cause_len + padding_len);
11011                 len += sizeof(struct udphdr);
11012                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11013         } else {
11014                 udp = NULL;
11015         }
11016 #endif
11017         shout->src_port = sh->dest_port;
11018         shout->dest_port = sh->src_port;
11019         shout->checksum = 0;
11020         if (vtag) {
11021                 shout->v_tag = htonl(vtag);
11022         } else {
11023                 shout->v_tag = sh->v_tag;
11024         }
11025         len += sizeof(struct sctphdr);
11026         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11027         ch->chunk_type = type;
11028         if (vtag) {
11029                 ch->chunk_flags = 0;
11030         } else {
11031                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11032         }
11033         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11034         len += sizeof(struct sctp_chunkhdr);
11035         len += cause_len + padding_len;
11036
11037         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11038                 sctp_m_freem(mout);
11039                 return;
11040         }
11041         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11042         switch (dst->sa_family) {
11043 #ifdef INET
11044         case AF_INET:
11045                 if (port) {
11046                         if (V_udp_cksum) {
11047                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11048                         } else {
11049                                 udp->uh_sum = 0;
11050                         }
11051                 }
11052                 ip->ip_len = htons(len);
11053                 if (port) {
11054 #if defined(SCTP_WITH_NO_CSUM)
11055                         SCTP_STAT_INCR(sctps_sendnocrc);
11056 #else
11057                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11058                         SCTP_STAT_INCR(sctps_sendswcrc);
11059 #endif
11060                         if (V_udp_cksum) {
11061                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11062                         }
11063                 } else {
11064 #if defined(SCTP_WITH_NO_CSUM)
11065                         SCTP_STAT_INCR(sctps_sendnocrc);
11066 #else
11067                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11068                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11069                         SCTP_STAT_INCR(sctps_sendhwcrc);
11070 #endif
11071                 }
11072 #ifdef SCTP_PACKET_LOGGING
11073                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11074                         sctp_packet_log(o_pak);
11075                 }
11076 #endif
11077                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11078                 break;
11079 #endif
11080 #ifdef INET6
11081         case AF_INET6:
11082                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11083                 if (port) {
11084 #if defined(SCTP_WITH_NO_CSUM)
11085                         SCTP_STAT_INCR(sctps_sendnocrc);
11086 #else
11087                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11088                         SCTP_STAT_INCR(sctps_sendswcrc);
11089 #endif
11090                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11091                                 udp->uh_sum = 0xffff;
11092                         }
11093                 } else {
11094 #if defined(SCTP_WITH_NO_CSUM)
11095                         SCTP_STAT_INCR(sctps_sendnocrc);
11096 #else
11097                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11098                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11099                         SCTP_STAT_INCR(sctps_sendhwcrc);
11100 #endif
11101                 }
11102 #ifdef SCTP_PACKET_LOGGING
11103                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11104                         sctp_packet_log(o_pak);
11105                 }
11106 #endif
11107                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11108                 break;
11109 #endif
11110         default:
11111                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11112                     dst->sa_family);
11113                 sctp_m_freem(mout);
11114                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11115                 return;
11116         }
11117         SCTP_STAT_INCR(sctps_sendpackets);
11118         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11119         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11120         return;
11121 }
11122
11123 void
11124 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11125     struct sctphdr *sh,
11126     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11127     uint32_t vrf_id, uint16_t port)
11128 {
11129         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11130             mflowtype, mflowid, fibnum,
11131             vrf_id, port);
11132 }
11133
11134 void
11135 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11136 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11137     SCTP_UNUSED
11138 #endif
11139 )
11140 {
11141         struct sctp_tmit_chunk *chk;
11142         struct sctp_heartbeat_chunk *hb;
11143         struct timeval now;
11144
11145         SCTP_TCB_LOCK_ASSERT(stcb);
11146         if (net == NULL) {
11147                 return;
11148         }
11149         (void)SCTP_GETTIME_TIMEVAL(&now);
11150         switch (net->ro._l_addr.sa.sa_family) {
11151 #ifdef INET
11152         case AF_INET:
11153                 break;
11154 #endif
11155 #ifdef INET6
11156         case AF_INET6:
11157                 break;
11158 #endif
11159         default:
11160                 return;
11161         }
11162         sctp_alloc_a_chunk(stcb, chk);
11163         if (chk == NULL) {
11164                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11165                 return;
11166         }
11167         chk->copy_by_ref = 0;
11168         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11169         chk->rec.chunk_id.can_take_data = 1;
11170         chk->flags = 0;
11171         chk->asoc = &stcb->asoc;
11172         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11173
11174         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11175         if (chk->data == NULL) {
11176                 sctp_free_a_chunk(stcb, chk, so_locked);
11177                 return;
11178         }
11179         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11180         SCTP_BUF_LEN(chk->data) = chk->send_size;
11181         chk->sent = SCTP_DATAGRAM_UNSENT;
11182         chk->snd_count = 0;
11183         chk->whoTo = net;
11184         atomic_add_int(&chk->whoTo->ref_count, 1);
11185         /* Now we have a mbuf that we can fill in with the details */
11186         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11187         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11188         /* fill out chunk header */
11189         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11190         hb->ch.chunk_flags = 0;
11191         hb->ch.chunk_length = htons(chk->send_size);
11192         /* Fill out hb parameter */
11193         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11194         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11195         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11196         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11197         /* Did our user request this one, put it in */
11198         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11199         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11200         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11201                 /*
11202                  * we only take from the entropy pool if the address is not
11203                  * confirmed.
11204                  */
11205                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11206                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11207         } else {
11208                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11209                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11210         }
11211         switch (net->ro._l_addr.sa.sa_family) {
11212 #ifdef INET
11213         case AF_INET:
11214                 memcpy(hb->heartbeat.hb_info.address,
11215                     &net->ro._l_addr.sin.sin_addr,
11216                     sizeof(net->ro._l_addr.sin.sin_addr));
11217                 break;
11218 #endif
11219 #ifdef INET6
11220         case AF_INET6:
11221                 memcpy(hb->heartbeat.hb_info.address,
11222                     &net->ro._l_addr.sin6.sin6_addr,
11223                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11224                 break;
11225 #endif
11226         default:
11227                 return;
11228                 break;
11229         }
11230         net->hb_responded = 0;
11231         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11232         stcb->asoc.ctrl_queue_cnt++;
11233         SCTP_STAT_INCR(sctps_sendheartbeat);
11234         return;
11235 }
11236
11237 void
11238 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11239     uint32_t high_tsn)
11240 {
11241         struct sctp_association *asoc;
11242         struct sctp_ecne_chunk *ecne;
11243         struct sctp_tmit_chunk *chk;
11244
11245         if (net == NULL) {
11246                 return;
11247         }
11248         asoc = &stcb->asoc;
11249         SCTP_TCB_LOCK_ASSERT(stcb);
11250         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11251                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11252                         /* found a previous ECN_ECHO update it if needed */
11253                         uint32_t cnt, ctsn;
11254
11255                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11256                         ctsn = ntohl(ecne->tsn);
11257                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11258                                 ecne->tsn = htonl(high_tsn);
11259                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11260                         }
11261                         cnt = ntohl(ecne->num_pkts_since_cwr);
11262                         cnt++;
11263                         ecne->num_pkts_since_cwr = htonl(cnt);
11264                         return;
11265                 }
11266         }
11267         /* nope could not find one to update so we must build one */
11268         sctp_alloc_a_chunk(stcb, chk);
11269         if (chk == NULL) {
11270                 return;
11271         }
11272         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11273         chk->copy_by_ref = 0;
11274         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11275         chk->rec.chunk_id.can_take_data = 0;
11276         chk->flags = 0;
11277         chk->asoc = &stcb->asoc;
11278         chk->send_size = sizeof(struct sctp_ecne_chunk);
11279         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11280         if (chk->data == NULL) {
11281                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11282                 return;
11283         }
11284         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11285         SCTP_BUF_LEN(chk->data) = chk->send_size;
11286         chk->sent = SCTP_DATAGRAM_UNSENT;
11287         chk->snd_count = 0;
11288         chk->whoTo = net;
11289         atomic_add_int(&chk->whoTo->ref_count, 1);
11290
11291         stcb->asoc.ecn_echo_cnt_onq++;
11292         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11293         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11294         ecne->ch.chunk_flags = 0;
11295         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11296         ecne->tsn = htonl(high_tsn);
11297         ecne->num_pkts_since_cwr = htonl(1);
11298         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11299         asoc->ctrl_queue_cnt++;
11300 }
11301
11302 void
11303 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11304     struct mbuf *m, int len, int iphlen, int bad_crc)
11305 {
11306         struct sctp_association *asoc;
11307         struct sctp_pktdrop_chunk *drp;
11308         struct sctp_tmit_chunk *chk;
11309         uint8_t *datap;
11310         int was_trunc = 0;
11311         int fullsz = 0;
11312         long spc;
11313         int offset;
11314         struct sctp_chunkhdr *ch, chunk_buf;
11315         unsigned int chk_length;
11316
11317         if (!stcb) {
11318                 return;
11319         }
11320         asoc = &stcb->asoc;
11321         SCTP_TCB_LOCK_ASSERT(stcb);
11322         if (asoc->pktdrop_supported == 0) {
11323                 /*-
11324                  * peer must declare support before I send one.
11325                  */
11326                 return;
11327         }
11328         if (stcb->sctp_socket == NULL) {
11329                 return;
11330         }
11331         sctp_alloc_a_chunk(stcb, chk);
11332         if (chk == NULL) {
11333                 return;
11334         }
11335         chk->copy_by_ref = 0;
11336         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11337         chk->rec.chunk_id.can_take_data = 1;
11338         chk->flags = 0;
11339         len -= iphlen;
11340         chk->send_size = len;
11341         /* Validate that we do not have an ABORT in here. */
11342         offset = iphlen + sizeof(struct sctphdr);
11343         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11344             sizeof(*ch), (uint8_t *) & chunk_buf);
11345         while (ch != NULL) {
11346                 chk_length = ntohs(ch->chunk_length);
11347                 if (chk_length < sizeof(*ch)) {
11348                         /* break to abort land */
11349                         break;
11350                 }
11351                 switch (ch->chunk_type) {
11352                 case SCTP_PACKET_DROPPED:
11353                 case SCTP_ABORT_ASSOCIATION:
11354                 case SCTP_INITIATION_ACK:
11355                         /**
11356                          * We don't respond with an PKT-DROP to an ABORT
11357                          * or PKT-DROP. We also do not respond to an
11358                          * INIT-ACK, because we can't know if the initiation
11359                          * tag is correct or not.
11360                          */
11361                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11362                         return;
11363                 default:
11364                         break;
11365                 }
11366                 offset += SCTP_SIZE32(chk_length);
11367                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11368                     sizeof(*ch), (uint8_t *) & chunk_buf);
11369         }
11370
11371         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11372             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11373                 /*
11374                  * only send 1 mtu worth, trim off the excess on the end.
11375                  */
11376                 fullsz = len;
11377                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11378                 was_trunc = 1;
11379         }
11380         chk->asoc = &stcb->asoc;
11381         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11382         if (chk->data == NULL) {
11383 jump_out:
11384                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11385                 return;
11386         }
11387         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11388         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11389         if (drp == NULL) {
11390                 sctp_m_freem(chk->data);
11391                 chk->data = NULL;
11392                 goto jump_out;
11393         }
11394         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11395             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11396         chk->book_size_scale = 0;
11397         if (was_trunc) {
11398                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11399                 drp->trunc_len = htons(fullsz);
11400                 /*
11401                  * Len is already adjusted to size minus overhead above take
11402                  * out the pkt_drop chunk itself from it.
11403                  */
11404                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11405                 len = chk->send_size;
11406         } else {
11407                 /* no truncation needed */
11408                 drp->ch.chunk_flags = 0;
11409                 drp->trunc_len = htons(0);
11410         }
11411         if (bad_crc) {
11412                 drp->ch.chunk_flags |= SCTP_BADCRC;
11413         }
11414         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11415         SCTP_BUF_LEN(chk->data) = chk->send_size;
11416         chk->sent = SCTP_DATAGRAM_UNSENT;
11417         chk->snd_count = 0;
11418         if (net) {
11419                 /* we should hit here */
11420                 chk->whoTo = net;
11421                 atomic_add_int(&chk->whoTo->ref_count, 1);
11422         } else {
11423                 chk->whoTo = NULL;
11424         }
11425         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11426         drp->ch.chunk_length = htons(chk->send_size);
11427         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11428         if (spc < 0) {
11429                 spc = 0;
11430         }
11431         drp->bottle_bw = htonl(spc);
11432         if (asoc->my_rwnd) {
11433                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11434                     asoc->size_on_all_streams +
11435                     asoc->my_rwnd_control_len +
11436                     stcb->sctp_socket->so_rcv.sb_cc);
11437         } else {
11438                 /*-
11439                  * If my rwnd is 0, possibly from mbuf depletion as well as
11440                  * space used, tell the peer there is NO space aka onq == bw
11441                  */
11442                 drp->current_onq = htonl(spc);
11443         }
11444         drp->reserved = 0;
11445         datap = drp->data;
11446         m_copydata(m, iphlen, len, (caddr_t)datap);
11447         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11448         asoc->ctrl_queue_cnt++;
11449 }
11450
11451 void
11452 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11453 {
11454         struct sctp_association *asoc;
11455         struct sctp_cwr_chunk *cwr;
11456         struct sctp_tmit_chunk *chk;
11457
11458         SCTP_TCB_LOCK_ASSERT(stcb);
11459         if (net == NULL) {
11460                 return;
11461         }
11462         asoc = &stcb->asoc;
11463         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11464                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11465                         /*
11466                          * found a previous CWR queued to same destination
11467                          * update it if needed
11468                          */
11469                         uint32_t ctsn;
11470
11471                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11472                         ctsn = ntohl(cwr->tsn);
11473                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11474                                 cwr->tsn = htonl(high_tsn);
11475                         }
11476                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11477                                 /* Make sure override is carried */
11478                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11479                         }
11480                         return;
11481                 }
11482         }
11483         sctp_alloc_a_chunk(stcb, chk);
11484         if (chk == NULL) {
11485                 return;
11486         }
11487         chk->copy_by_ref = 0;
11488         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11489         chk->rec.chunk_id.can_take_data = 1;
11490         chk->flags = 0;
11491         chk->asoc = &stcb->asoc;
11492         chk->send_size = sizeof(struct sctp_cwr_chunk);
11493         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11494         if (chk->data == NULL) {
11495                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11496                 return;
11497         }
11498         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11499         SCTP_BUF_LEN(chk->data) = chk->send_size;
11500         chk->sent = SCTP_DATAGRAM_UNSENT;
11501         chk->snd_count = 0;
11502         chk->whoTo = net;
11503         atomic_add_int(&chk->whoTo->ref_count, 1);
11504         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11505         cwr->ch.chunk_type = SCTP_ECN_CWR;
11506         cwr->ch.chunk_flags = override;
11507         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11508         cwr->tsn = htonl(high_tsn);
11509         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11510         asoc->ctrl_queue_cnt++;
11511 }
11512
11513 void
11514 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11515     int number_entries, uint16_t * list,
11516     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11517 {
11518         uint16_t len, old_len, i;
11519         struct sctp_stream_reset_out_request *req_out;
11520         struct sctp_chunkhdr *ch;
11521
11522         ch = mtod(chk->data, struct sctp_chunkhdr *);
11523         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11524
11525         /* get to new offset for the param. */
11526         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11527         /* now how long will this param be? */
11528         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11529         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11530         req_out->ph.param_length = htons(len);
11531         req_out->request_seq = htonl(seq);
11532         req_out->response_seq = htonl(resp_seq);
11533         req_out->send_reset_at_tsn = htonl(last_sent);
11534         if (number_entries) {
11535                 for (i = 0; i < number_entries; i++) {
11536                         req_out->list_of_streams[i] = htons(list[i]);
11537                 }
11538         }
11539         if (SCTP_SIZE32(len) > len) {
11540                 /*-
11541                  * Need to worry about the pad we may end up adding to the
11542                  * end. This is easy since the struct is either aligned to 4
11543                  * bytes or 2 bytes off.
11544                  */
11545                 req_out->list_of_streams[number_entries] = 0;
11546         }
11547         /* now fix the chunk length */
11548         ch->chunk_length = htons(len + old_len);
11549         chk->book_size = len + old_len;
11550         chk->book_size_scale = 0;
11551         chk->send_size = SCTP_SIZE32(chk->book_size);
11552         SCTP_BUF_LEN(chk->data) = chk->send_size;
11553         return;
11554 }
11555
11556 static void
11557 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11558     int number_entries, uint16_t * list,
11559     uint32_t seq)
11560 {
11561         uint16_t len, old_len, i;
11562         struct sctp_stream_reset_in_request *req_in;
11563         struct sctp_chunkhdr *ch;
11564
11565         ch = mtod(chk->data, struct sctp_chunkhdr *);
11566         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11567
11568         /* get to new offset for the param. */
11569         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11570         /* now how long will this param be? */
11571         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11572         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11573         req_in->ph.param_length = htons(len);
11574         req_in->request_seq = htonl(seq);
11575         if (number_entries) {
11576                 for (i = 0; i < number_entries; i++) {
11577                         req_in->list_of_streams[i] = htons(list[i]);
11578                 }
11579         }
11580         if (SCTP_SIZE32(len) > len) {
11581                 /*-
11582                  * Need to worry about the pad we may end up adding to the
11583                  * end. This is easy since the struct is either aligned to 4
11584                  * bytes or 2 bytes off.
11585                  */
11586                 req_in->list_of_streams[number_entries] = 0;
11587         }
11588         /* now fix the chunk length */
11589         ch->chunk_length = htons(len + old_len);
11590         chk->book_size = len + old_len;
11591         chk->book_size_scale = 0;
11592         chk->send_size = SCTP_SIZE32(chk->book_size);
11593         SCTP_BUF_LEN(chk->data) = chk->send_size;
11594         return;
11595 }
11596
11597 static void
11598 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11599     uint32_t seq)
11600 {
11601         uint16_t len, old_len;
11602         struct sctp_stream_reset_tsn_request *req_tsn;
11603         struct sctp_chunkhdr *ch;
11604
11605         ch = mtod(chk->data, struct sctp_chunkhdr *);
11606         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11607
11608         /* get to new offset for the param. */
11609         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11610         /* now how long will this param be? */
11611         len = sizeof(struct sctp_stream_reset_tsn_request);
11612         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11613         req_tsn->ph.param_length = htons(len);
11614         req_tsn->request_seq = htonl(seq);
11615
11616         /* now fix the chunk length */
11617         ch->chunk_length = htons(len + old_len);
11618         chk->send_size = len + old_len;
11619         chk->book_size = SCTP_SIZE32(chk->send_size);
11620         chk->book_size_scale = 0;
11621         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11622         return;
11623 }
11624
11625 void
11626 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11627     uint32_t resp_seq, uint32_t result)
11628 {
11629         uint16_t len, old_len;
11630         struct sctp_stream_reset_response *resp;
11631         struct sctp_chunkhdr *ch;
11632
11633         ch = mtod(chk->data, struct sctp_chunkhdr *);
11634         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11635
11636         /* get to new offset for the param. */
11637         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11638         /* now how long will this param be? */
11639         len = sizeof(struct sctp_stream_reset_response);
11640         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11641         resp->ph.param_length = htons(len);
11642         resp->response_seq = htonl(resp_seq);
11643         resp->result = ntohl(result);
11644
11645         /* now fix the chunk length */
11646         ch->chunk_length = htons(len + old_len);
11647         chk->book_size = len + old_len;
11648         chk->book_size_scale = 0;
11649         chk->send_size = SCTP_SIZE32(chk->book_size);
11650         SCTP_BUF_LEN(chk->data) = chk->send_size;
11651         return;
11652 }
11653
11654 void
11655 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11656     uint32_t resp_seq, uint32_t result,
11657     uint32_t send_una, uint32_t recv_next)
11658 {
11659         uint16_t len, old_len;
11660         struct sctp_stream_reset_response_tsn *resp;
11661         struct sctp_chunkhdr *ch;
11662
11663         ch = mtod(chk->data, struct sctp_chunkhdr *);
11664         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11665
11666         /* get to new offset for the param. */
11667         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11668         /* now how long will this param be? */
11669         len = sizeof(struct sctp_stream_reset_response_tsn);
11670         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11671         resp->ph.param_length = htons(len);
11672         resp->response_seq = htonl(resp_seq);
11673         resp->result = htonl(result);
11674         resp->senders_next_tsn = htonl(send_una);
11675         resp->receivers_next_tsn = htonl(recv_next);
11676
11677         /* now fix the chunk length */
11678         ch->chunk_length = htons(len + old_len);
11679         chk->book_size = len + old_len;
11680         chk->send_size = SCTP_SIZE32(chk->book_size);
11681         chk->book_size_scale = 0;
11682         SCTP_BUF_LEN(chk->data) = chk->send_size;
11683         return;
11684 }
11685
11686 static void
11687 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11688     uint32_t seq,
11689     uint16_t adding)
11690 {
11691         uint16_t len, old_len;
11692         struct sctp_chunkhdr *ch;
11693         struct sctp_stream_reset_add_strm *addstr;
11694
11695         ch = mtod(chk->data, struct sctp_chunkhdr *);
11696         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11697
11698         /* get to new offset for the param. */
11699         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11700         /* now how long will this param be? */
11701         len = sizeof(struct sctp_stream_reset_add_strm);
11702
11703         /* Fill it out. */
11704         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11705         addstr->ph.param_length = htons(len);
11706         addstr->request_seq = htonl(seq);
11707         addstr->number_of_streams = htons(adding);
11708         addstr->reserved = 0;
11709
11710         /* now fix the chunk length */
11711         ch->chunk_length = htons(len + old_len);
11712         chk->send_size = len + old_len;
11713         chk->book_size = SCTP_SIZE32(chk->send_size);
11714         chk->book_size_scale = 0;
11715         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11716         return;
11717 }
11718
11719 static void
11720 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11721     uint32_t seq,
11722     uint16_t adding)
11723 {
11724         uint16_t len, old_len;
11725         struct sctp_chunkhdr *ch;
11726         struct sctp_stream_reset_add_strm *addstr;
11727
11728         ch = mtod(chk->data, struct sctp_chunkhdr *);
11729         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11730
11731         /* get to new offset for the param. */
11732         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11733         /* now how long will this param be? */
11734         len = sizeof(struct sctp_stream_reset_add_strm);
11735         /* Fill it out. */
11736         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11737         addstr->ph.param_length = htons(len);
11738         addstr->request_seq = htonl(seq);
11739         addstr->number_of_streams = htons(adding);
11740         addstr->reserved = 0;
11741
11742         /* now fix the chunk length */
11743         ch->chunk_length = htons(len + old_len);
11744         chk->send_size = len + old_len;
11745         chk->book_size = SCTP_SIZE32(chk->send_size);
11746         chk->book_size_scale = 0;
11747         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11748         return;
11749 }
11750
11751 int
11752 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11753     uint16_t number_entries, uint16_t * list,
11754     uint8_t send_out_req,
11755     uint8_t send_in_req,
11756     uint8_t send_tsn_req,
11757     uint8_t add_stream,
11758     uint16_t adding_o,
11759     uint16_t adding_i, uint8_t peer_asked)
11760 {
11761
11762         struct sctp_association *asoc;
11763         struct sctp_tmit_chunk *chk;
11764         struct sctp_chunkhdr *ch;
11765         uint32_t seq;
11766
11767         asoc = &stcb->asoc;
11768         if (asoc->stream_reset_outstanding) {
11769                 /*-
11770                  * Already one pending, must get ACK back to clear the flag.
11771                  */
11772                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11773                 return (EBUSY);
11774         }
11775         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11776             (add_stream == 0)) {
11777                 /* nothing to do */
11778                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11779                 return (EINVAL);
11780         }
11781         if (send_tsn_req && (send_out_req || send_in_req)) {
11782                 /* error, can't do that */
11783                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11784                 return (EINVAL);
11785         }
11786         if (number_entries > (MCLBYTES -
11787             SCTP_MIN_OVERHEAD -
11788             sizeof(struct sctp_chunkhdr) -
11789             sizeof(struct sctp_stream_reset_out_request)) /
11790             sizeof(uint16_t)) {
11791                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11792                 return (ENOMEM);
11793         }
11794         sctp_alloc_a_chunk(stcb, chk);
11795         if (chk == NULL) {
11796                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11797                 return (ENOMEM);
11798         }
11799         chk->copy_by_ref = 0;
11800         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11801         chk->rec.chunk_id.can_take_data = 0;
11802         chk->flags = 0;
11803         chk->asoc = &stcb->asoc;
11804         chk->book_size = sizeof(struct sctp_chunkhdr);
11805         chk->send_size = SCTP_SIZE32(chk->book_size);
11806         chk->book_size_scale = 0;
11807
11808         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11809         if (chk->data == NULL) {
11810                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11811                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11812                 return (ENOMEM);
11813         }
11814         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11815
11816         /* setup chunk parameters */
11817         chk->sent = SCTP_DATAGRAM_UNSENT;
11818         chk->snd_count = 0;
11819         if (stcb->asoc.alternate) {
11820                 chk->whoTo = stcb->asoc.alternate;
11821         } else {
11822                 chk->whoTo = stcb->asoc.primary_destination;
11823         }
11824         atomic_add_int(&chk->whoTo->ref_count, 1);
11825         ch = mtod(chk->data, struct sctp_chunkhdr *);
11826         ch->chunk_type = SCTP_STREAM_RESET;
11827         ch->chunk_flags = 0;
11828         ch->chunk_length = htons(chk->book_size);
11829         SCTP_BUF_LEN(chk->data) = chk->send_size;
11830
11831         seq = stcb->asoc.str_reset_seq_out;
11832         if (send_out_req) {
11833                 sctp_add_stream_reset_out(chk, number_entries, list,
11834                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11835                 asoc->stream_reset_out_is_outstanding = 1;
11836                 seq++;
11837                 asoc->stream_reset_outstanding++;
11838         }
11839         if ((add_stream & 1) &&
11840             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11841                 /* Need to allocate more */
11842                 struct sctp_stream_out *oldstream;
11843                 struct sctp_stream_queue_pending *sp, *nsp;
11844                 int i;
11845
11846 #if defined(SCTP_DETAILED_STR_STATS)
11847                 int j;
11848
11849 #endif
11850
11851                 oldstream = stcb->asoc.strmout;
11852                 /* get some more */
11853                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11854                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11855                     SCTP_M_STRMO);
11856                 if (stcb->asoc.strmout == NULL) {
11857                         uint8_t x;
11858
11859                         stcb->asoc.strmout = oldstream;
11860                         /* Turn off the bit */
11861                         x = add_stream & 0xfe;
11862                         add_stream = x;
11863                         goto skip_stuff;
11864                 }
11865                 /*
11866                  * Ok now we proceed with copying the old out stuff and
11867                  * initializing the new stuff.
11868                  */
11869                 SCTP_TCB_SEND_LOCK(stcb);
11870                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11871                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11872                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11873                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11874                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11875                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11876                         stcb->asoc.strmout[i].stream_no = i;
11877                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11878                         /* now anything on those queues? */
11879                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11880                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11881                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11882                         }
11883                         /* Now move assoc pointers too */
11884                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11885                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11886                         }
11887                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11888                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11889                         }
11890                 }
11891                 /* now the new streams */
11892                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11893                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11894                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11895                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11896 #if defined(SCTP_DETAILED_STR_STATS)
11897                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
11898                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
11899                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
11900                         }
11901 #else
11902                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
11903                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
11904 #endif
11905                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11906                         stcb->asoc.strmout[i].stream_no = i;
11907                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11908                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11909                 }
11910                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11911                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11912                 SCTP_TCB_SEND_UNLOCK(stcb);
11913         }
11914 skip_stuff:
11915         if ((add_stream & 1) && (adding_o > 0)) {
11916                 asoc->strm_pending_add_size = adding_o;
11917                 asoc->peer_req_out = peer_asked;
11918                 sctp_add_an_out_stream(chk, seq, adding_o);
11919                 seq++;
11920                 asoc->stream_reset_outstanding++;
11921         }
11922         if ((add_stream & 2) && (adding_i > 0)) {
11923                 sctp_add_an_in_stream(chk, seq, adding_i);
11924                 seq++;
11925                 asoc->stream_reset_outstanding++;
11926         }
11927         if (send_in_req) {
11928                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11929                 seq++;
11930                 asoc->stream_reset_outstanding++;
11931         }
11932         if (send_tsn_req) {
11933                 sctp_add_stream_reset_tsn(chk, seq);
11934                 asoc->stream_reset_outstanding++;
11935         }
11936         asoc->str_reset = chk;
11937         /* insert the chunk for sending */
11938         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11939             chk,
11940             sctp_next);
11941         asoc->ctrl_queue_cnt++;
11942         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11943         return (0);
11944 }
11945
11946 void
11947 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11948     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11949     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11950     uint32_t vrf_id, uint16_t port)
11951 {
11952         /* Don't respond to an ABORT with an ABORT. */
11953         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11954                 if (cause)
11955                         sctp_m_freem(cause);
11956                 return;
11957         }
11958         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11959             mflowtype, mflowid, fibnum,
11960             vrf_id, port);
11961         return;
11962 }
11963
11964 void
11965 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11966     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11967     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11968     uint32_t vrf_id, uint16_t port)
11969 {
11970         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11971             mflowtype, mflowid, fibnum,
11972             vrf_id, port);
11973         return;
11974 }
11975
11976 static struct mbuf *
11977 sctp_copy_resume(struct uio *uio,
11978     int max_send_len,
11979     int user_marks_eor,
11980     int *error,
11981     uint32_t * sndout,
11982     struct mbuf **new_tail)
11983 {
11984         struct mbuf *m;
11985
11986         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11987             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11988         if (m == NULL) {
11989                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
11990                 *error = ENOBUFS;
11991         } else {
11992                 *sndout = m_length(m, NULL);
11993                 *new_tail = m_last(m);
11994         }
11995         return (m);
11996 }
11997
11998 static int
11999 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12000     struct uio *uio,
12001     int resv_upfront)
12002 {
12003         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12004             resv_upfront, 0);
12005         if (sp->data == NULL) {
12006                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12007                 return (ENOBUFS);
12008         }
12009         sp->tail_mbuf = m_last(sp->data);
12010         return (0);
12011 }
12012
12013
12014
12015 static struct sctp_stream_queue_pending *
12016 sctp_copy_it_in(struct sctp_tcb *stcb,
12017     struct sctp_association *asoc,
12018     struct sctp_sndrcvinfo *srcv,
12019     struct uio *uio,
12020     struct sctp_nets *net,
12021     int max_send_len,
12022     int user_marks_eor,
12023     int *error)
12024 {
12025         /*-
12026          * This routine must be very careful in its work. Protocol
12027          * processing is up and running so care must be taken to spl...()
12028          * when you need to do something that may effect the stcb/asoc. The
12029          * sb is locked however. When data is copied the protocol processing
12030          * should be enabled since this is a slower operation...
12031          */
12032         struct sctp_stream_queue_pending *sp = NULL;
12033         int resv_in_first;
12034
12035         *error = 0;
12036         /* Now can we send this? */
12037         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12038             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12039             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12040             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12041                 /* got data while shutting down */
12042                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12043                 *error = ECONNRESET;
12044                 goto out_now;
12045         }
12046         sctp_alloc_a_strmoq(stcb, sp);
12047         if (sp == NULL) {
12048                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12049                 *error = ENOMEM;
12050                 goto out_now;
12051         }
12052         sp->act_flags = 0;
12053         sp->sender_all_done = 0;
12054         sp->sinfo_flags = srcv->sinfo_flags;
12055         sp->timetolive = srcv->sinfo_timetolive;
12056         sp->ppid = srcv->sinfo_ppid;
12057         sp->context = srcv->sinfo_context;
12058         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12059
12060         sp->stream = srcv->sinfo_stream;
12061         sp->length = min(uio->uio_resid, max_send_len);
12062         if ((sp->length == (uint32_t) uio->uio_resid) &&
12063             ((user_marks_eor == 0) ||
12064             (srcv->sinfo_flags & SCTP_EOF) ||
12065             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12066                 sp->msg_is_complete = 1;
12067         } else {
12068                 sp->msg_is_complete = 0;
12069         }
12070         sp->sender_all_done = 0;
12071         sp->some_taken = 0;
12072         sp->put_last_out = 0;
12073         resv_in_first = sizeof(struct sctp_data_chunk);
12074         sp->data = sp->tail_mbuf = NULL;
12075         if (sp->length == 0) {
12076                 *error = 0;
12077                 goto skip_copy;
12078         }
12079         if (srcv->sinfo_keynumber_valid) {
12080                 sp->auth_keyid = srcv->sinfo_keynumber;
12081         } else {
12082                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12083         }
12084         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12085                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12086                 sp->holds_key_ref = 1;
12087         }
12088         *error = sctp_copy_one(sp, uio, resv_in_first);
12089 skip_copy:
12090         if (*error) {
12091                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12092                 sp = NULL;
12093         } else {
12094                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12095                         sp->net = net;
12096                         atomic_add_int(&sp->net->ref_count, 1);
12097                 } else {
12098                         sp->net = NULL;
12099                 }
12100                 sctp_set_prsctp_policy(sp);
12101         }
12102 out_now:
12103         return (sp);
12104 }
12105
12106
12107 int
12108 sctp_sosend(struct socket *so,
12109     struct sockaddr *addr,
12110     struct uio *uio,
12111     struct mbuf *top,
12112     struct mbuf *control,
12113     int flags,
12114     struct thread *p
12115 )
12116 {
12117         int error, use_sndinfo = 0;
12118         struct sctp_sndrcvinfo sndrcvninfo;
12119         struct sockaddr *addr_to_use;
12120
12121 #if defined(INET) && defined(INET6)
12122         struct sockaddr_in sin;
12123
12124 #endif
12125
12126         if (control) {
12127                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12128                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12129                     sizeof(sndrcvninfo))) {
12130                         /* got one */
12131                         use_sndinfo = 1;
12132                 }
12133         }
12134         addr_to_use = addr;
12135 #if defined(INET) && defined(INET6)
12136         if ((addr) && (addr->sa_family == AF_INET6)) {
12137                 struct sockaddr_in6 *sin6;
12138
12139                 sin6 = (struct sockaddr_in6 *)addr;
12140                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12141                         in6_sin6_2_sin(&sin, sin6);
12142                         addr_to_use = (struct sockaddr *)&sin;
12143                 }
12144         }
12145 #endif
12146         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12147             control,
12148             flags,
12149             use_sndinfo ? &sndrcvninfo : NULL
12150             ,p
12151             );
12152         return (error);
12153 }
12154
12155
12156 int
12157 sctp_lower_sosend(struct socket *so,
12158     struct sockaddr *addr,
12159     struct uio *uio,
12160     struct mbuf *i_pak,
12161     struct mbuf *control,
12162     int flags,
12163     struct sctp_sndrcvinfo *srcv
12164     ,
12165     struct thread *p
12166 )
12167 {
12168         unsigned int sndlen = 0, max_len;
12169         int error, len;
12170         struct mbuf *top = NULL;
12171         int queue_only = 0, queue_only_for_init = 0;
12172         int free_cnt_applied = 0;
12173         int un_sent;
12174         int now_filled = 0;
12175         unsigned int inqueue_bytes = 0;
12176         struct sctp_block_entry be;
12177         struct sctp_inpcb *inp;
12178         struct sctp_tcb *stcb = NULL;
12179         struct timeval now;
12180         struct sctp_nets *net;
12181         struct sctp_association *asoc;
12182         struct sctp_inpcb *t_inp;
12183         int user_marks_eor;
12184         int create_lock_applied = 0;
12185         int nagle_applies = 0;
12186         int some_on_control = 0;
12187         int got_all_of_the_send = 0;
12188         int hold_tcblock = 0;
12189         int non_blocking = 0;
12190         uint32_t local_add_more, local_soresv = 0;
12191         uint16_t port;
12192         uint16_t sinfo_flags;
12193         sctp_assoc_t sinfo_assoc_id;
12194
12195         error = 0;
12196         net = NULL;
12197         stcb = NULL;
12198         asoc = NULL;
12199
12200         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12201         if (inp == NULL) {
12202                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12203                 error = EINVAL;
12204                 if (i_pak) {
12205                         SCTP_RELEASE_PKT(i_pak);
12206                 }
12207                 return (error);
12208         }
12209         if ((uio == NULL) && (i_pak == NULL)) {
12210                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12211                 return (EINVAL);
12212         }
12213         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12214         atomic_add_int(&inp->total_sends, 1);
12215         if (uio) {
12216                 if (uio->uio_resid < 0) {
12217                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12218                         return (EINVAL);
12219                 }
12220                 sndlen = uio->uio_resid;
12221         } else {
12222                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12223                 sndlen = SCTP_HEADER_LEN(i_pak);
12224         }
12225         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12226             (void *)addr,
12227             sndlen);
12228         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12229             (inp->sctp_socket->so_qlimit)) {
12230                 /* The listener can NOT send */
12231                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12232                 error = ENOTCONN;
12233                 goto out_unlocked;
12234         }
12235         /**
12236          * Pre-screen address, if one is given the sin-len
12237          * must be set correctly!
12238          */
12239         if (addr) {
12240                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12241
12242                 switch (raddr->sa.sa_family) {
12243 #ifdef INET
12244                 case AF_INET:
12245                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12246                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12247                                 error = EINVAL;
12248                                 goto out_unlocked;
12249                         }
12250                         port = raddr->sin.sin_port;
12251                         break;
12252 #endif
12253 #ifdef INET6
12254                 case AF_INET6:
12255                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12256                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12257                                 error = EINVAL;
12258                                 goto out_unlocked;
12259                         }
12260                         port = raddr->sin6.sin6_port;
12261                         break;
12262 #endif
12263                 default:
12264                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12265                         error = EAFNOSUPPORT;
12266                         goto out_unlocked;
12267                 }
12268         } else
12269                 port = 0;
12270
12271         if (srcv) {
12272                 sinfo_flags = srcv->sinfo_flags;
12273                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12274                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12275                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12276                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12277                         error = EINVAL;
12278                         goto out_unlocked;
12279                 }
12280                 if (srcv->sinfo_flags)
12281                         SCTP_STAT_INCR(sctps_sends_with_flags);
12282         } else {
12283                 sinfo_flags = inp->def_send.sinfo_flags;
12284                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12285         }
12286         if (sinfo_flags & SCTP_SENDALL) {
12287                 /* its a sendall */
12288                 error = sctp_sendall(inp, uio, top, srcv);
12289                 top = NULL;
12290                 goto out_unlocked;
12291         }
12292         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12293                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12294                 error = EINVAL;
12295                 goto out_unlocked;
12296         }
12297         /* now we must find the assoc */
12298         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12299             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12300                 SCTP_INP_RLOCK(inp);
12301                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12302                 if (stcb) {
12303                         SCTP_TCB_LOCK(stcb);
12304                         hold_tcblock = 1;
12305                 }
12306                 SCTP_INP_RUNLOCK(inp);
12307         } else if (sinfo_assoc_id) {
12308                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12309         } else if (addr) {
12310                 /*-
12311                  * Since we did not use findep we must
12312                  * increment it, and if we don't find a tcb
12313                  * decrement it.
12314                  */
12315                 SCTP_INP_WLOCK(inp);
12316                 SCTP_INP_INCR_REF(inp);
12317                 SCTP_INP_WUNLOCK(inp);
12318                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12319                 if (stcb == NULL) {
12320                         SCTP_INP_WLOCK(inp);
12321                         SCTP_INP_DECR_REF(inp);
12322                         SCTP_INP_WUNLOCK(inp);
12323                 } else {
12324                         hold_tcblock = 1;
12325                 }
12326         }
12327         if ((stcb == NULL) && (addr)) {
12328                 /* Possible implicit send? */
12329                 SCTP_ASOC_CREATE_LOCK(inp);
12330                 create_lock_applied = 1;
12331                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12332                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12333                         /* Should I really unlock ? */
12334                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12335                         error = EINVAL;
12336                         goto out_unlocked;
12337
12338                 }
12339                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12340                     (addr->sa_family == AF_INET6)) {
12341                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12342                         error = EINVAL;
12343                         goto out_unlocked;
12344                 }
12345                 SCTP_INP_WLOCK(inp);
12346                 SCTP_INP_INCR_REF(inp);
12347                 SCTP_INP_WUNLOCK(inp);
12348                 /* With the lock applied look again */
12349                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12350                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12351                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12352                 }
12353                 if (stcb == NULL) {
12354                         SCTP_INP_WLOCK(inp);
12355                         SCTP_INP_DECR_REF(inp);
12356                         SCTP_INP_WUNLOCK(inp);
12357                 } else {
12358                         hold_tcblock = 1;
12359                 }
12360                 if (error) {
12361                         goto out_unlocked;
12362                 }
12363                 if (t_inp != inp) {
12364                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12365                         error = ENOTCONN;
12366                         goto out_unlocked;
12367                 }
12368         }
12369         if (stcb == NULL) {
12370                 if (addr == NULL) {
12371                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12372                         error = ENOENT;
12373                         goto out_unlocked;
12374                 } else {
12375                         /* We must go ahead and start the INIT process */
12376                         uint32_t vrf_id;
12377
12378                         if ((sinfo_flags & SCTP_ABORT) ||
12379                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12380                                 /*-
12381                                  * User asks to abort a non-existant assoc,
12382                                  * or EOF a non-existant assoc with no data
12383                                  */
12384                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12385                                 error = ENOENT;
12386                                 goto out_unlocked;
12387                         }
12388                         /* get an asoc/stcb struct */
12389                         vrf_id = inp->def_vrf_id;
12390 #ifdef INVARIANTS
12391                         if (create_lock_applied == 0) {
12392                                 panic("Error, should hold create lock and I don't?");
12393                         }
12394 #endif
12395                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12396                             p
12397                             );
12398                         if (stcb == NULL) {
12399                                 /* Error is setup for us in the call */
12400                                 goto out_unlocked;
12401                         }
12402                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12403                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12404                                 /*
12405                                  * Set the connected flag so we can queue
12406                                  * data
12407                                  */
12408                                 soisconnecting(so);
12409                         }
12410                         hold_tcblock = 1;
12411                         if (create_lock_applied) {
12412                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12413                                 create_lock_applied = 0;
12414                         } else {
12415                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12416                         }
12417                         /*
12418                          * Turn on queue only flag to prevent data from
12419                          * being sent
12420                          */
12421                         queue_only = 1;
12422                         asoc = &stcb->asoc;
12423                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12424                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12425
12426                         /* initialize authentication params for the assoc */
12427                         sctp_initialize_auth_params(inp, stcb);
12428
12429                         if (control) {
12430                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12431                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12432                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12433                                         hold_tcblock = 0;
12434                                         stcb = NULL;
12435                                         goto out_unlocked;
12436                                 }
12437                         }
12438                         /* out with the INIT */
12439                         queue_only_for_init = 1;
12440                         /*-
12441                          * we may want to dig in after this call and adjust the MTU
12442                          * value. It defaulted to 1500 (constant) but the ro
12443                          * structure may now have an update and thus we may need to
12444                          * change it BEFORE we append the message.
12445                          */
12446                 }
12447         } else
12448                 asoc = &stcb->asoc;
12449         if (srcv == NULL)
12450                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12451         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12452                 if (addr)
12453                         net = sctp_findnet(stcb, addr);
12454                 else
12455                         net = NULL;
12456                 if ((net == NULL) ||
12457                     ((port != 0) && (port != stcb->rport))) {
12458                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12459                         error = EINVAL;
12460                         goto out_unlocked;
12461                 }
12462         } else {
12463                 if (stcb->asoc.alternate) {
12464                         net = stcb->asoc.alternate;
12465                 } else {
12466                         net = stcb->asoc.primary_destination;
12467                 }
12468         }
12469         atomic_add_int(&stcb->total_sends, 1);
12470         /* Keep the stcb from being freed under our feet */
12471         atomic_add_int(&asoc->refcnt, 1);
12472         free_cnt_applied = 1;
12473
12474         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12475                 if (sndlen > asoc->smallest_mtu) {
12476                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12477                         error = EMSGSIZE;
12478                         goto out_unlocked;
12479                 }
12480         }
12481         if (SCTP_SO_IS_NBIO(so)
12482             || (flags & MSG_NBIO)
12483             ) {
12484                 non_blocking = 1;
12485         }
12486         /* would we block? */
12487         if (non_blocking) {
12488                 if (hold_tcblock == 0) {
12489                         SCTP_TCB_LOCK(stcb);
12490                         hold_tcblock = 1;
12491                 }
12492                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12493                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12494                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12495                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12496                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12497                                 error = EMSGSIZE;
12498                         else
12499                                 error = EWOULDBLOCK;
12500                         goto out_unlocked;
12501                 }
12502                 stcb->asoc.sb_send_resv += sndlen;
12503                 SCTP_TCB_UNLOCK(stcb);
12504                 hold_tcblock = 0;
12505         } else {
12506                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12507         }
12508         local_soresv = sndlen;
12509         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12510                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12511                 error = ECONNRESET;
12512                 goto out_unlocked;
12513         }
12514         if (create_lock_applied) {
12515                 SCTP_ASOC_CREATE_UNLOCK(inp);
12516                 create_lock_applied = 0;
12517         }
12518         if (asoc->stream_reset_outstanding) {
12519                 /*
12520                  * Can't queue any data while stream reset is underway.
12521                  */
12522                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12523                 error = EAGAIN;
12524                 goto out_unlocked;
12525         }
12526         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12527             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12528                 queue_only = 1;
12529         }
12530         /* we are now done with all control */
12531         if (control) {
12532                 sctp_m_freem(control);
12533                 control = NULL;
12534         }
12535         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12536             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12537             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12538             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12539                 if (srcv->sinfo_flags & SCTP_ABORT) {
12540                         ;
12541                 } else {
12542                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12543                         error = ECONNRESET;
12544                         goto out_unlocked;
12545                 }
12546         }
12547         /* Ok, we will attempt a msgsnd :> */
12548         if (p) {
12549                 p->td_ru.ru_msgsnd++;
12550         }
12551         /* Are we aborting? */
12552         if (srcv->sinfo_flags & SCTP_ABORT) {
12553                 struct mbuf *mm;
12554                 int tot_demand, tot_out = 0, max_out;
12555
12556                 SCTP_STAT_INCR(sctps_sends_with_abort);
12557                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12558                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12559                         /* It has to be up before we abort */
12560                         /* how big is the user initiated abort? */
12561                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12562                         error = EINVAL;
12563                         goto out;
12564                 }
12565                 if (hold_tcblock) {
12566                         SCTP_TCB_UNLOCK(stcb);
12567                         hold_tcblock = 0;
12568                 }
12569                 if (top) {
12570                         struct mbuf *cntm = NULL;
12571
12572                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12573                         if (sndlen != 0) {
12574                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12575                                         tot_out += SCTP_BUF_LEN(cntm);
12576                                 }
12577                         }
12578                 } else {
12579                         /* Must fit in a MTU */
12580                         tot_out = sndlen;
12581                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12582                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12583                                 /* To big */
12584                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12585                                 error = EMSGSIZE;
12586                                 goto out;
12587                         }
12588                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12589                 }
12590                 if (mm == NULL) {
12591                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12592                         error = ENOMEM;
12593                         goto out;
12594                 }
12595                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12596                 max_out -= sizeof(struct sctp_abort_msg);
12597                 if (tot_out > max_out) {
12598                         tot_out = max_out;
12599                 }
12600                 if (mm) {
12601                         struct sctp_paramhdr *ph;
12602
12603                         /* now move forward the data pointer */
12604                         ph = mtod(mm, struct sctp_paramhdr *);
12605                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12606                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12607                         ph++;
12608                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12609                         if (top == NULL) {
12610                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12611                                 if (error) {
12612                                         /*-
12613                                          * Here if we can't get his data we
12614                                          * still abort we just don't get to
12615                                          * send the users note :-0
12616                                          */
12617                                         sctp_m_freem(mm);
12618                                         mm = NULL;
12619                                 }
12620                         } else {
12621                                 if (sndlen != 0) {
12622                                         SCTP_BUF_NEXT(mm) = top;
12623                                 }
12624                         }
12625                 }
12626                 if (hold_tcblock == 0) {
12627                         SCTP_TCB_LOCK(stcb);
12628                 }
12629                 atomic_add_int(&stcb->asoc.refcnt, -1);
12630                 free_cnt_applied = 0;
12631                 /* release this lock, otherwise we hang on ourselves */
12632                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12633                 /* now relock the stcb so everything is sane */
12634                 hold_tcblock = 0;
12635                 stcb = NULL;
12636                 /*
12637                  * In this case top is already chained to mm avoid double
12638                  * free, since we free it below if top != NULL and driver
12639                  * would free it after sending the packet out
12640                  */
12641                 if (sndlen != 0) {
12642                         top = NULL;
12643                 }
12644                 goto out_unlocked;
12645         }
12646         /* Calculate the maximum we can send */
12647         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12648         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12649                 if (non_blocking) {
12650                         /* we already checked for non-blocking above. */
12651                         max_len = sndlen;
12652                 } else {
12653                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12654                 }
12655         } else {
12656                 max_len = 0;
12657         }
12658         if (hold_tcblock) {
12659                 SCTP_TCB_UNLOCK(stcb);
12660                 hold_tcblock = 0;
12661         }
12662         /* Is the stream no. valid? */
12663         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12664                 /* Invalid stream number */
12665                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12666                 error = EINVAL;
12667                 goto out_unlocked;
12668         }
12669         if (asoc->strmout == NULL) {
12670                 /* huh? software error */
12671                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12672                 error = EFAULT;
12673                 goto out_unlocked;
12674         }
12675         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12676         if ((user_marks_eor == 0) &&
12677             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12678                 /* It will NEVER fit */
12679                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12680                 error = EMSGSIZE;
12681                 goto out_unlocked;
12682         }
12683         if ((uio == NULL) && user_marks_eor) {
12684                 /*-
12685                  * We do not support eeor mode for
12686                  * sending with mbuf chains (like sendfile).
12687                  */
12688                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12689                 error = EINVAL;
12690                 goto out_unlocked;
12691         }
12692         if (user_marks_eor) {
12693                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12694         } else {
12695                 /*-
12696                  * For non-eeor the whole message must fit in
12697                  * the socket send buffer.
12698                  */
12699                 local_add_more = sndlen;
12700         }
12701         len = 0;
12702         if (non_blocking) {
12703                 goto skip_preblock;
12704         }
12705         if (((max_len <= local_add_more) &&
12706             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12707             (max_len == 0) ||
12708             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12709                 /* No room right now ! */
12710                 SOCKBUF_LOCK(&so->so_snd);
12711                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12712                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12713                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12714                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12715                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12716                             inqueue_bytes,
12717                             local_add_more,
12718                             stcb->asoc.stream_queue_cnt,
12719                             stcb->asoc.chunks_on_out_queue,
12720                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12721                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12722                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12723                         }
12724                         be.error = 0;
12725                         stcb->block_entry = &be;
12726                         error = sbwait(&so->so_snd);
12727                         stcb->block_entry = NULL;
12728                         if (error || so->so_error || be.error) {
12729                                 if (error == 0) {
12730                                         if (so->so_error)
12731                                                 error = so->so_error;
12732                                         if (be.error) {
12733                                                 error = be.error;
12734                                         }
12735                                 }
12736                                 SOCKBUF_UNLOCK(&so->so_snd);
12737                                 goto out_unlocked;
12738                         }
12739                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12740                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12741                                     asoc, stcb->asoc.total_output_queue_size);
12742                         }
12743                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12744                                 goto out_unlocked;
12745                         }
12746                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12747                 }
12748                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12749                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12750                 } else {
12751                         max_len = 0;
12752                 }
12753                 SOCKBUF_UNLOCK(&so->so_snd);
12754         }
12755 skip_preblock:
12756         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12757                 goto out_unlocked;
12758         }
12759         /*
12760          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12761          * case NOTE: uio will be null when top/mbuf is passed
12762          */
12763         if (sndlen == 0) {
12764                 if (srcv->sinfo_flags & SCTP_EOF) {
12765                         got_all_of_the_send = 1;
12766                         goto dataless_eof;
12767                 } else {
12768                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12769                         error = EINVAL;
12770                         goto out;
12771                 }
12772         }
12773         if (top == NULL) {
12774                 struct sctp_stream_queue_pending *sp;
12775                 struct sctp_stream_out *strm;
12776                 uint32_t sndout;
12777
12778                 SCTP_TCB_SEND_LOCK(stcb);
12779                 if ((asoc->stream_locked) &&
12780                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12781                         SCTP_TCB_SEND_UNLOCK(stcb);
12782                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12783                         error = EINVAL;
12784                         goto out;
12785                 }
12786                 SCTP_TCB_SEND_UNLOCK(stcb);
12787
12788                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12789                 if (strm->last_msg_incomplete == 0) {
12790         do_a_copy_in:
12791                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12792                         if ((sp == NULL) || (error)) {
12793                                 goto out;
12794                         }
12795                         SCTP_TCB_SEND_LOCK(stcb);
12796                         if (sp->msg_is_complete) {
12797                                 strm->last_msg_incomplete = 0;
12798                                 asoc->stream_locked = 0;
12799                         } else {
12800                                 /*
12801                                  * Just got locked to this guy in case of an
12802                                  * interrupt.
12803                                  */
12804                                 strm->last_msg_incomplete = 1;
12805                                 asoc->stream_locked = 1;
12806                                 asoc->stream_locked_on = srcv->sinfo_stream;
12807                                 sp->sender_all_done = 0;
12808                         }
12809                         sctp_snd_sb_alloc(stcb, sp->length);
12810                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12811                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12812                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12813                         }
12814                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12815                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12816                         SCTP_TCB_SEND_UNLOCK(stcb);
12817                 } else {
12818                         SCTP_TCB_SEND_LOCK(stcb);
12819                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12820                         SCTP_TCB_SEND_UNLOCK(stcb);
12821                         if (sp == NULL) {
12822                                 /* ???? Huh ??? last msg is gone */
12823 #ifdef INVARIANTS
12824                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12825 #else
12826                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12827                                 strm->last_msg_incomplete = 0;
12828 #endif
12829                                 goto do_a_copy_in;
12830
12831                         }
12832                 }
12833                 while (uio->uio_resid > 0) {
12834                         /* How much room do we have? */
12835                         struct mbuf *new_tail, *mm;
12836
12837                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12838                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12839                         else
12840                                 max_len = 0;
12841
12842                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12843                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12844                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12845                                 sndout = 0;
12846                                 new_tail = NULL;
12847                                 if (hold_tcblock) {
12848                                         SCTP_TCB_UNLOCK(stcb);
12849                                         hold_tcblock = 0;
12850                                 }
12851                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12852                                 if ((mm == NULL) || error) {
12853                                         if (mm) {
12854                                                 sctp_m_freem(mm);
12855                                         }
12856                                         goto out;
12857                                 }
12858                                 /* Update the mbuf and count */
12859                                 SCTP_TCB_SEND_LOCK(stcb);
12860                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12861                                         /*
12862                                          * we need to get out. Peer probably
12863                                          * aborted.
12864                                          */
12865                                         sctp_m_freem(mm);
12866                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12867                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12868                                                 error = ECONNRESET;
12869                                         }
12870                                         SCTP_TCB_SEND_UNLOCK(stcb);
12871                                         goto out;
12872                                 }
12873                                 if (sp->tail_mbuf) {
12874                                         /* tack it to the end */
12875                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12876                                         sp->tail_mbuf = new_tail;
12877                                 } else {
12878                                         /* A stolen mbuf */
12879                                         sp->data = mm;
12880                                         sp->tail_mbuf = new_tail;
12881                                 }
12882                                 sctp_snd_sb_alloc(stcb, sndout);
12883                                 atomic_add_int(&sp->length, sndout);
12884                                 len += sndout;
12885
12886                                 /* Did we reach EOR? */
12887                                 if ((uio->uio_resid == 0) &&
12888                                     ((user_marks_eor == 0) ||
12889                                     (srcv->sinfo_flags & SCTP_EOF) ||
12890                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12891                                         sp->msg_is_complete = 1;
12892                                 } else {
12893                                         sp->msg_is_complete = 0;
12894                                 }
12895                                 SCTP_TCB_SEND_UNLOCK(stcb);
12896                         }
12897                         if (uio->uio_resid == 0) {
12898                                 /* got it all? */
12899                                 continue;
12900                         }
12901                         /* PR-SCTP? */
12902                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
12903                                 /*
12904                                  * This is ugly but we must assure locking
12905                                  * order
12906                                  */
12907                                 if (hold_tcblock == 0) {
12908                                         SCTP_TCB_LOCK(stcb);
12909                                         hold_tcblock = 1;
12910                                 }
12911                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12912                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12913                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12914                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12915                                 else
12916                                         max_len = 0;
12917                                 if (max_len > 0) {
12918                                         continue;
12919                                 }
12920                                 SCTP_TCB_UNLOCK(stcb);
12921                                 hold_tcblock = 0;
12922                         }
12923                         /* wait for space now */
12924                         if (non_blocking) {
12925                                 /* Non-blocking io in place out */
12926                                 goto skip_out_eof;
12927                         }
12928                         /* What about the INIT, send it maybe */
12929                         if (queue_only_for_init) {
12930                                 if (hold_tcblock == 0) {
12931                                         SCTP_TCB_LOCK(stcb);
12932                                         hold_tcblock = 1;
12933                                 }
12934                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12935                                         /* a collision took us forward? */
12936                                         queue_only = 0;
12937                                 } else {
12938                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12939                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12940                                         queue_only = 1;
12941                                 }
12942                         }
12943                         if ((net->flight_size > net->cwnd) &&
12944                             (asoc->sctp_cmt_on_off == 0)) {
12945                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12946                                 queue_only = 1;
12947                         } else if (asoc->ifp_had_enobuf) {
12948                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12949                                 if (net->flight_size > (2 * net->mtu)) {
12950                                         queue_only = 1;
12951                                 }
12952                                 asoc->ifp_had_enobuf = 0;
12953                         }
12954                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12955                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12956                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12957                             (stcb->asoc.total_flight > 0) &&
12958                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12959                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12960
12961                                 /*-
12962                                  * Ok, Nagle is set on and we have data outstanding.
12963                                  * Don't send anything and let SACKs drive out the
12964                                  * data unless wen have a "full" segment to send.
12965                                  */
12966                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12967                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12968                                 }
12969                                 SCTP_STAT_INCR(sctps_naglequeued);
12970                                 nagle_applies = 1;
12971                         } else {
12972                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12973                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12974                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12975                                 }
12976                                 SCTP_STAT_INCR(sctps_naglesent);
12977                                 nagle_applies = 0;
12978                         }
12979                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12980
12981                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12982                                     nagle_applies, un_sent);
12983                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12984                                     stcb->asoc.total_flight,
12985                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12986                         }
12987                         if (queue_only_for_init)
12988                                 queue_only_for_init = 0;
12989                         if ((queue_only == 0) && (nagle_applies == 0)) {
12990                                 /*-
12991                                  * need to start chunk output
12992                                  * before blocking.. note that if
12993                                  * a lock is already applied, then
12994                                  * the input via the net is happening
12995                                  * and I don't need to start output :-D
12996                                  */
12997                                 if (hold_tcblock == 0) {
12998                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12999                                                 hold_tcblock = 1;
13000                                                 sctp_chunk_output(inp,
13001                                                     stcb,
13002                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13003                                         }
13004                                 } else {
13005                                         sctp_chunk_output(inp,
13006                                             stcb,
13007                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13008                                 }
13009                                 if (hold_tcblock == 1) {
13010                                         SCTP_TCB_UNLOCK(stcb);
13011                                         hold_tcblock = 0;
13012                                 }
13013                         }
13014                         SOCKBUF_LOCK(&so->so_snd);
13015                         /*-
13016                          * This is a bit strange, but I think it will
13017                          * work. The total_output_queue_size is locked and
13018                          * protected by the TCB_LOCK, which we just released.
13019                          * There is a race that can occur between releasing it
13020                          * above, and me getting the socket lock, where sacks
13021                          * come in but we have not put the SB_WAIT on the
13022                          * so_snd buffer to get the wakeup. After the LOCK
13023                          * is applied the sack_processing will also need to
13024                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13025                          * once we have the socket buffer lock if we recheck the
13026                          * size we KNOW we will get to sleep safely with the
13027                          * wakeup flag in place.
13028                          */
13029                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13030                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13031                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13032                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13033                                             asoc, uio->uio_resid);
13034                                 }
13035                                 be.error = 0;
13036                                 stcb->block_entry = &be;
13037                                 error = sbwait(&so->so_snd);
13038                                 stcb->block_entry = NULL;
13039
13040                                 if (error || so->so_error || be.error) {
13041                                         if (error == 0) {
13042                                                 if (so->so_error)
13043                                                         error = so->so_error;
13044                                                 if (be.error) {
13045                                                         error = be.error;
13046                                                 }
13047                                         }
13048                                         SOCKBUF_UNLOCK(&so->so_snd);
13049                                         goto out_unlocked;
13050                                 }
13051                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13052                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13053                                             asoc, stcb->asoc.total_output_queue_size);
13054                                 }
13055                         }
13056                         SOCKBUF_UNLOCK(&so->so_snd);
13057                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13058                                 goto out_unlocked;
13059                         }
13060                 }
13061                 SCTP_TCB_SEND_LOCK(stcb);
13062                 if (sp) {
13063                         if (sp->msg_is_complete == 0) {
13064                                 strm->last_msg_incomplete = 1;
13065                                 asoc->stream_locked = 1;
13066                                 asoc->stream_locked_on = srcv->sinfo_stream;
13067                         } else {
13068                                 sp->sender_all_done = 1;
13069                                 strm->last_msg_incomplete = 0;
13070                                 asoc->stream_locked = 0;
13071                         }
13072                 } else {
13073                         SCTP_PRINTF("Huh no sp TSNH?\n");
13074                         strm->last_msg_incomplete = 0;
13075                         asoc->stream_locked = 0;
13076                 }
13077                 SCTP_TCB_SEND_UNLOCK(stcb);
13078                 if (uio->uio_resid == 0) {
13079                         got_all_of_the_send = 1;
13080                 }
13081         } else {
13082                 /* We send in a 0, since we do NOT have any locks */
13083                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13084                 top = NULL;
13085                 if (srcv->sinfo_flags & SCTP_EOF) {
13086                         /*
13087                          * This should only happen for Panda for the mbuf
13088                          * send case, which does NOT yet support EEOR mode.
13089                          * Thus, we can just set this flag to do the proper
13090                          * EOF handling.
13091                          */
13092                         got_all_of_the_send = 1;
13093                 }
13094         }
13095         if (error) {
13096                 goto out;
13097         }
13098 dataless_eof:
13099         /* EOF thing ? */
13100         if ((srcv->sinfo_flags & SCTP_EOF) &&
13101             (got_all_of_the_send == 1)) {
13102                 int cnt;
13103
13104                 SCTP_STAT_INCR(sctps_sends_with_eof);
13105                 error = 0;
13106                 if (hold_tcblock == 0) {
13107                         SCTP_TCB_LOCK(stcb);
13108                         hold_tcblock = 1;
13109                 }
13110                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13111                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13112                     TAILQ_EMPTY(&asoc->sent_queue) &&
13113                     (cnt == 0)) {
13114                         if (asoc->locked_on_sending) {
13115                                 goto abort_anyway;
13116                         }
13117                         /* there is nothing queued to send, so I'm done... */
13118                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13119                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13120                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13121                                 struct sctp_nets *netp;
13122
13123                                 /* only send SHUTDOWN the first time through */
13124                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13125                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13126                                 }
13127                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13128                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13129                                 sctp_stop_timers_for_shutdown(stcb);
13130                                 if (stcb->asoc.alternate) {
13131                                         netp = stcb->asoc.alternate;
13132                                 } else {
13133                                         netp = stcb->asoc.primary_destination;
13134                                 }
13135                                 sctp_send_shutdown(stcb, netp);
13136                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13137                                     netp);
13138                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13139                                     asoc->primary_destination);
13140                         }
13141                 } else {
13142                         /*-
13143                          * we still got (or just got) data to send, so set
13144                          * SHUTDOWN_PENDING
13145                          */
13146                         /*-
13147                          * XXX sockets draft says that SCTP_EOF should be
13148                          * sent with no data.  currently, we will allow user
13149                          * data to be sent first and move to
13150                          * SHUTDOWN-PENDING
13151                          */
13152                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13153                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13154                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13155                                 if (hold_tcblock == 0) {
13156                                         SCTP_TCB_LOCK(stcb);
13157                                         hold_tcblock = 1;
13158                                 }
13159                                 if (asoc->locked_on_sending) {
13160                                         /* Locked to send out the data */
13161                                         struct sctp_stream_queue_pending *sp;
13162
13163                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13164                                         if (sp) {
13165                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13166                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13167                                         }
13168                                 }
13169                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13170                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13171                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13172                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13173                         abort_anyway:
13174                                         if (free_cnt_applied) {
13175                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13176                                                 free_cnt_applied = 0;
13177                                         }
13178                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13179                                             NULL, SCTP_SO_LOCKED);
13180                                         /*
13181                                          * now relock the stcb so everything
13182                                          * is sane
13183                                          */
13184                                         hold_tcblock = 0;
13185                                         stcb = NULL;
13186                                         goto out;
13187                                 }
13188                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13189                                     asoc->primary_destination);
13190                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13191                         }
13192                 }
13193         }
13194 skip_out_eof:
13195         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13196                 some_on_control = 1;
13197         }
13198         if (queue_only_for_init) {
13199                 if (hold_tcblock == 0) {
13200                         SCTP_TCB_LOCK(stcb);
13201                         hold_tcblock = 1;
13202                 }
13203                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13204                         /* a collision took us forward? */
13205                         queue_only = 0;
13206                 } else {
13207                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13208                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13209                         queue_only = 1;
13210                 }
13211         }
13212         if ((net->flight_size > net->cwnd) &&
13213             (stcb->asoc.sctp_cmt_on_off == 0)) {
13214                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13215                 queue_only = 1;
13216         } else if (asoc->ifp_had_enobuf) {
13217                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13218                 if (net->flight_size > (2 * net->mtu)) {
13219                         queue_only = 1;
13220                 }
13221                 asoc->ifp_had_enobuf = 0;
13222         }
13223         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13224             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13225         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13226             (stcb->asoc.total_flight > 0) &&
13227             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13228             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13229                 /*-
13230                  * Ok, Nagle is set on and we have data outstanding.
13231                  * Don't send anything and let SACKs drive out the
13232                  * data unless wen have a "full" segment to send.
13233                  */
13234                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13235                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13236                 }
13237                 SCTP_STAT_INCR(sctps_naglequeued);
13238                 nagle_applies = 1;
13239         } else {
13240                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13241                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13242                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13243                 }
13244                 SCTP_STAT_INCR(sctps_naglesent);
13245                 nagle_applies = 0;
13246         }
13247         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13248                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13249                     nagle_applies, un_sent);
13250                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13251                     stcb->asoc.total_flight,
13252                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13253         }
13254         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13255                 /* we can attempt to send too. */
13256                 if (hold_tcblock == 0) {
13257                         /*
13258                          * If there is activity recv'ing sacks no need to
13259                          * send
13260                          */
13261                         if (SCTP_TCB_TRYLOCK(stcb)) {
13262                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13263                                 hold_tcblock = 1;
13264                         }
13265                 } else {
13266                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13267                 }
13268         } else if ((queue_only == 0) &&
13269                     (stcb->asoc.peers_rwnd == 0) &&
13270             (stcb->asoc.total_flight == 0)) {
13271                 /* We get to have a probe outstanding */
13272                 if (hold_tcblock == 0) {
13273                         hold_tcblock = 1;
13274                         SCTP_TCB_LOCK(stcb);
13275                 }
13276                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13277         } else if (some_on_control) {
13278                 int num_out, reason, frag_point;
13279
13280                 /* Here we do control only */
13281                 if (hold_tcblock == 0) {
13282                         hold_tcblock = 1;
13283                         SCTP_TCB_LOCK(stcb);
13284                 }
13285                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13286                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13287                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13288         }
13289         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13290             queue_only, stcb->asoc.peers_rwnd, un_sent,
13291             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13292             stcb->asoc.total_output_queue_size, error);
13293
13294 out:
13295 out_unlocked:
13296
13297         if (local_soresv && stcb) {
13298                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13299         }
13300         if (create_lock_applied) {
13301                 SCTP_ASOC_CREATE_UNLOCK(inp);
13302         }
13303         if ((stcb) && hold_tcblock) {
13304                 SCTP_TCB_UNLOCK(stcb);
13305         }
13306         if (stcb && free_cnt_applied) {
13307                 atomic_add_int(&stcb->asoc.refcnt, -1);
13308         }
13309 #ifdef INVARIANTS
13310         if (stcb) {
13311                 if (mtx_owned(&stcb->tcb_mtx)) {
13312                         panic("Leaving with tcb mtx owned?");
13313                 }
13314                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13315                         panic("Leaving with tcb send mtx owned?");
13316                 }
13317         }
13318 #endif
13319 #ifdef INVARIANTS
13320         if (inp) {
13321                 sctp_validate_no_locks(inp);
13322         } else {
13323                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13324         }
13325 #endif
13326         if (top) {
13327                 sctp_m_freem(top);
13328         }
13329         if (control) {
13330                 sctp_m_freem(control);
13331         }
13332         return (error);
13333 }
13334
13335
13336 /*
13337  * generate an AUTHentication chunk, if required
13338  */
13339 struct mbuf *
13340 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13341     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13342     struct sctp_tcb *stcb, uint8_t chunk)
13343 {
13344         struct mbuf *m_auth;
13345         struct sctp_auth_chunk *auth;
13346         int chunk_len;
13347         struct mbuf *cn;
13348
13349         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13350             (stcb == NULL))
13351                 return (m);
13352
13353         if (stcb->asoc.auth_supported == 0) {
13354                 return (m);
13355         }
13356         /* does the requested chunk require auth? */
13357         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13358                 return (m);
13359         }
13360         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13361         if (m_auth == NULL) {
13362                 /* no mbuf's */
13363                 return (m);
13364         }
13365         /* reserve some space if this will be the first mbuf */
13366         if (m == NULL)
13367                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13368         /* fill in the AUTH chunk details */
13369         auth = mtod(m_auth, struct sctp_auth_chunk *);
13370         bzero(auth, sizeof(*auth));
13371         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13372         auth->ch.chunk_flags = 0;
13373         chunk_len = sizeof(*auth) +
13374             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13375         auth->ch.chunk_length = htons(chunk_len);
13376         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13377         /* key id and hmac digest will be computed and filled in upon send */
13378
13379         /* save the offset where the auth was inserted into the chain */
13380         *offset = 0;
13381         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13382                 *offset += SCTP_BUF_LEN(cn);
13383         }
13384
13385         /* update length and return pointer to the auth chunk */
13386         SCTP_BUF_LEN(m_auth) = chunk_len;
13387         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13388         if (auth_ret != NULL)
13389                 *auth_ret = auth;
13390
13391         return (m);
13392 }
13393
13394 #ifdef INET6
13395 int
13396 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13397 {
13398         struct nd_prefix *pfx = NULL;
13399         struct nd_pfxrouter *pfxrtr = NULL;
13400         struct sockaddr_in6 gw6;
13401
13402         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13403                 return (0);
13404
13405         /* get prefix entry of address */
13406         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13407                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13408                         continue;
13409                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13410                     &src6->sin6_addr, &pfx->ndpr_mask))
13411                         break;
13412         }
13413         /* no prefix entry in the prefix list */
13414         if (pfx == NULL) {
13415                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13416                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13417                 return (0);
13418         }
13419         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13420         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13421
13422         /* search installed gateway from prefix entry */
13423         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13424                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13425                 gw6.sin6_family = AF_INET6;
13426                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13427                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13428                     sizeof(struct in6_addr));
13429                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13430                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13431                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13432                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13433                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13434                     ro->ro_rt->rt_gateway)) {
13435                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13436                         return (1);
13437                 }
13438         }
13439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13440         return (0);
13441 }
13442
13443 #endif
13444
13445 int
13446 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13447 {
13448 #ifdef INET
13449         struct sockaddr_in *sin, *mask;
13450         struct ifaddr *ifa;
13451         struct in_addr srcnetaddr, gwnetaddr;
13452
13453         if (ro == NULL || ro->ro_rt == NULL ||
13454             sifa->address.sa.sa_family != AF_INET) {
13455                 return (0);
13456         }
13457         ifa = (struct ifaddr *)sifa->ifa;
13458         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13459         sin = &sifa->address.sin;
13460         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13461         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13462         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13463         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13464
13465         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13466         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13467         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13468         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13469         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13470         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13471                 return (1);
13472         }
13473 #endif
13474         return (0);
13475 }