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                             __func__);
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                             __func__);
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.strmout[i].state = SCTP_STREAM_OPENING;
3656                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3657                                         }
3658                                 }
3659                                 break;
3660 #ifdef INET
3661                         case SCTP_DSTADDRV4:
3662                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3663                                         *error = EINVAL;
3664                                         return (1);
3665                                 }
3666                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3667                                 sin.sin_family = AF_INET;
3668                                 sin.sin_len = sizeof(struct sockaddr_in);
3669                                 sin.sin_port = stcb->rport;
3670                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3671                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3672                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3673                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3674                                         *error = EINVAL;
3675                                         return (1);
3676                                 }
3677                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3678                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3679                                         *error = ENOBUFS;
3680                                         return (1);
3681                                 }
3682                                 break;
3683 #endif
3684 #ifdef INET6
3685                         case SCTP_DSTADDRV6:
3686                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3687                                         *error = EINVAL;
3688                                         return (1);
3689                                 }
3690                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3691                                 sin6.sin6_family = AF_INET6;
3692                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3693                                 sin6.sin6_port = stcb->rport;
3694                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3695                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3696                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3697                                         *error = EINVAL;
3698                                         return (1);
3699                                 }
3700 #ifdef INET
3701                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3702                                         in6_sin6_2_sin(&sin, &sin6);
3703                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3704                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3705                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3706                                                 *error = EINVAL;
3707                                                 return (1);
3708                                         }
3709                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3710                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3711                                                 *error = ENOBUFS;
3712                                                 return (1);
3713                                         }
3714                                 } else
3715 #endif
3716                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3717                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3718                                         *error = ENOBUFS;
3719                                         return (1);
3720                                 }
3721                                 break;
3722 #endif
3723                         default:
3724                                 break;
3725                         }
3726                 }
3727                 at += CMSG_ALIGN(cmh.cmsg_len);
3728         }
3729         return (0);
3730 }
3731
3732 static struct sctp_tcb *
3733 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3734     uint16_t port,
3735     struct mbuf *control,
3736     struct sctp_nets **net_p,
3737     int *error)
3738 {
3739         struct cmsghdr cmh;
3740         int tlen, at;
3741         struct sctp_tcb *stcb;
3742         struct sockaddr *addr;
3743
3744 #ifdef INET
3745         struct sockaddr_in sin;
3746
3747 #endif
3748 #ifdef INET6
3749         struct sockaddr_in6 sin6;
3750
3751 #endif
3752
3753         tlen = SCTP_BUF_LEN(control);
3754         at = 0;
3755         while (at < tlen) {
3756                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3757                         /* There is not enough room for one more. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3762                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3763                         /* We dont't have a complete CMSG header. */
3764                         *error = EINVAL;
3765                         return (NULL);
3766                 }
3767                 if (((int)cmh.cmsg_len + at) > tlen) {
3768                         /* We don't have the complete CMSG. */
3769                         *error = EINVAL;
3770                         return (NULL);
3771                 }
3772                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3773                         switch (cmh.cmsg_type) {
3774 #ifdef INET
3775                         case SCTP_DSTADDRV4:
3776                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3777                                         *error = EINVAL;
3778                                         return (NULL);
3779                                 }
3780                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3781                                 sin.sin_family = AF_INET;
3782                                 sin.sin_len = sizeof(struct sockaddr_in);
3783                                 sin.sin_port = port;
3784                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3785                                 addr = (struct sockaddr *)&sin;
3786                                 break;
3787 #endif
3788 #ifdef INET6
3789                         case SCTP_DSTADDRV6:
3790                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3791                                         *error = EINVAL;
3792                                         return (NULL);
3793                                 }
3794                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3795                                 sin6.sin6_family = AF_INET6;
3796                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3797                                 sin6.sin6_port = port;
3798                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3799 #ifdef INET
3800                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3801                                         in6_sin6_2_sin(&sin, &sin6);
3802                                         addr = (struct sockaddr *)&sin;
3803                                 } else
3804 #endif
3805                                         addr = (struct sockaddr *)&sin6;
3806                                 break;
3807 #endif
3808                         default:
3809                                 addr = NULL;
3810                                 break;
3811                         }
3812                         if (addr) {
3813                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3814                                 if (stcb != NULL) {
3815                                         return (stcb);
3816                                 }
3817                         }
3818                 }
3819                 at += CMSG_ALIGN(cmh.cmsg_len);
3820         }
3821         return (NULL);
3822 }
3823
3824 static struct mbuf *
3825 sctp_add_cookie(struct mbuf *init, int init_offset,
3826     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3827 {
3828         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3829         struct sctp_state_cookie *stc;
3830         struct sctp_paramhdr *ph;
3831         uint8_t *foo;
3832         int sig_offset;
3833         uint16_t cookie_sz;
3834
3835         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3836             sizeof(struct sctp_paramhdr)), 0,
3837             M_NOWAIT, 1, MT_DATA);
3838         if (mret == NULL) {
3839                 return (NULL);
3840         }
3841         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3842         if (copy_init == NULL) {
3843                 sctp_m_freem(mret);
3844                 return (NULL);
3845         }
3846 #ifdef SCTP_MBUF_LOGGING
3847         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3848                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3849         }
3850 #endif
3851         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3852             M_NOWAIT);
3853         if (copy_initack == NULL) {
3854                 sctp_m_freem(mret);
3855                 sctp_m_freem(copy_init);
3856                 return (NULL);
3857         }
3858 #ifdef SCTP_MBUF_LOGGING
3859         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3860                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3861         }
3862 #endif
3863         /* easy side we just drop it on the end */
3864         ph = mtod(mret, struct sctp_paramhdr *);
3865         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3866             sizeof(struct sctp_paramhdr);
3867         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3868             sizeof(struct sctp_paramhdr));
3869         ph->param_type = htons(SCTP_STATE_COOKIE);
3870         ph->param_length = 0;   /* fill in at the end */
3871         /* Fill in the stc cookie data */
3872         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3873
3874         /* tack the INIT and then the INIT-ACK onto the chain */
3875         cookie_sz = 0;
3876         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3877                 cookie_sz += SCTP_BUF_LEN(m_at);
3878                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3879                         SCTP_BUF_NEXT(m_at) = copy_init;
3880                         break;
3881                 }
3882         }
3883         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3884                 cookie_sz += SCTP_BUF_LEN(m_at);
3885                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3886                         SCTP_BUF_NEXT(m_at) = copy_initack;
3887                         break;
3888                 }
3889         }
3890         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3891                 cookie_sz += SCTP_BUF_LEN(m_at);
3892                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3893                         break;
3894                 }
3895         }
3896         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3897         if (sig == NULL) {
3898                 /* no space, so free the entire chain */
3899                 sctp_m_freem(mret);
3900                 return (NULL);
3901         }
3902         SCTP_BUF_LEN(sig) = 0;
3903         SCTP_BUF_NEXT(m_at) = sig;
3904         sig_offset = 0;
3905         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3906         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3907         *signature = foo;
3908         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3909         cookie_sz += SCTP_SIGNATURE_SIZE;
3910         ph->param_length = htons(cookie_sz);
3911         return (mret);
3912 }
3913
3914
3915 static uint8_t
3916 sctp_get_ect(struct sctp_tcb *stcb)
3917 {
3918         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3919                 return (SCTP_ECT0_BIT);
3920         } else {
3921                 return (0);
3922         }
3923 }
3924
3925 #if defined(INET) || defined(INET6)
3926 static void
3927 sctp_handle_no_route(struct sctp_tcb *stcb,
3928     struct sctp_nets *net,
3929     int so_locked)
3930 {
3931         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3932
3933         if (net) {
3934                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3935                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3936                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3937                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3938                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3939                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3940                                     stcb, 0,
3941                                     (void *)net,
3942                                     so_locked);
3943                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3944                                 net->dest_state &= ~SCTP_ADDR_PF;
3945                         }
3946                 }
3947                 if (stcb) {
3948                         if (net == stcb->asoc.primary_destination) {
3949                                 /* need a new primary */
3950                                 struct sctp_nets *alt;
3951
3952                                 alt = sctp_find_alternate_net(stcb, net, 0);
3953                                 if (alt != net) {
3954                                         if (stcb->asoc.alternate) {
3955                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3956                                         }
3957                                         stcb->asoc.alternate = alt;
3958                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3959                                         if (net->ro._s_addr) {
3960                                                 sctp_free_ifa(net->ro._s_addr);
3961                                                 net->ro._s_addr = NULL;
3962                                         }
3963                                         net->src_addr_selected = 0;
3964                                 }
3965                         }
3966                 }
3967         }
3968 }
3969
3970 #endif
3971
3972 static int
3973 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3974     struct sctp_tcb *stcb,      /* may be NULL */
3975     struct sctp_nets *net,
3976     struct sockaddr *to,
3977     struct mbuf *m,
3978     uint32_t auth_offset,
3979     struct sctp_auth_chunk *auth,
3980     uint16_t auth_keyid,
3981     int nofragment_flag,
3982     int ecn_ok,
3983     int out_of_asoc_ok,
3984     uint16_t src_port,
3985     uint16_t dest_port,
3986     uint32_t v_tag,
3987     uint16_t port,
3988     union sctp_sockstore *over_addr,
3989     uint8_t mflowtype, uint32_t mflowid,
3990 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3991     int so_locked SCTP_UNUSED
3992 #else
3993     int so_locked
3994 #endif
3995 )
3996 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3997 {
3998         /**
3999          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4000          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4001          * - fill in the HMAC digest of any AUTH chunk in the packet.
4002          * - calculate and fill in the SCTP checksum.
4003          * - prepend an IP address header.
4004          * - if boundall use INADDR_ANY.
4005          * - if boundspecific do source address selection.
4006          * - set fragmentation option for ipV4.
4007          * - On return from IP output, check/adjust mtu size of output
4008          *   interface and smallest_mtu size as well.
4009          */
4010         /* Will need ifdefs around this */
4011         struct mbuf *newm;
4012         struct sctphdr *sctphdr;
4013         int packet_length;
4014         int ret;
4015
4016 #if defined(INET) || defined(INET6)
4017         uint32_t vrf_id;
4018
4019 #endif
4020 #if defined(INET) || defined(INET6)
4021         struct mbuf *o_pak;
4022         sctp_route_t *ro = NULL;
4023         struct udphdr *udp = NULL;
4024
4025 #endif
4026         uint8_t tos_value;
4027
4028 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4029         struct socket *so = NULL;
4030
4031 #endif
4032
4033         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4034                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4035                 sctp_m_freem(m);
4036                 return (EFAULT);
4037         }
4038 #if defined(INET) || defined(INET6)
4039         if (stcb) {
4040                 vrf_id = stcb->asoc.vrf_id;
4041         } else {
4042                 vrf_id = inp->def_vrf_id;
4043         }
4044 #endif
4045         /* fill in the HMAC digest for any AUTH chunk in the packet */
4046         if ((auth != NULL) && (stcb != NULL)) {
4047                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4048         }
4049         if (net) {
4050                 tos_value = net->dscp;
4051         } else if (stcb) {
4052                 tos_value = stcb->asoc.default_dscp;
4053         } else {
4054                 tos_value = inp->sctp_ep.default_dscp;
4055         }
4056
4057         switch (to->sa_family) {
4058 #ifdef INET
4059         case AF_INET:
4060                 {
4061                         struct ip *ip = NULL;
4062                         sctp_route_t iproute;
4063                         int len;
4064
4065                         len = SCTP_MIN_V4_OVERHEAD;
4066                         if (port) {
4067                                 len += sizeof(struct udphdr);
4068                         }
4069                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4070                         if (newm == NULL) {
4071                                 sctp_m_freem(m);
4072                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4073                                 return (ENOMEM);
4074                         }
4075                         SCTP_ALIGN_TO_END(newm, len);
4076                         SCTP_BUF_LEN(newm) = len;
4077                         SCTP_BUF_NEXT(newm) = m;
4078                         m = newm;
4079                         if (net != NULL) {
4080                                 m->m_pkthdr.flowid = net->flowid;
4081                                 M_HASHTYPE_SET(m, net->flowtype);
4082                         } else {
4083                                 m->m_pkthdr.flowid = mflowid;
4084                                 M_HASHTYPE_SET(m, mflowtype);
4085                         }
4086                         packet_length = sctp_calculate_len(m);
4087                         ip = mtod(m, struct ip *);
4088                         ip->ip_v = IPVERSION;
4089                         ip->ip_hl = (sizeof(struct ip) >> 2);
4090                         if (tos_value == 0) {
4091                                 /*
4092                                  * This means especially, that it is not set
4093                                  * at the SCTP layer. So use the value from
4094                                  * the IP layer.
4095                                  */
4096                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4097                         }
4098                         tos_value &= 0xfc;
4099                         if (ecn_ok) {
4100                                 tos_value |= sctp_get_ect(stcb);
4101                         }
4102                         if ((nofragment_flag) && (port == 0)) {
4103                                 ip->ip_off = htons(IP_DF);
4104                         } else {
4105                                 ip->ip_off = htons(0);
4106                         }
4107                         /* FreeBSD has a function for ip_id's */
4108                         ip_fillid(ip);
4109
4110                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4111                         ip->ip_len = htons(packet_length);
4112                         ip->ip_tos = tos_value;
4113                         if (port) {
4114                                 ip->ip_p = IPPROTO_UDP;
4115                         } else {
4116                                 ip->ip_p = IPPROTO_SCTP;
4117                         }
4118                         ip->ip_sum = 0;
4119                         if (net == NULL) {
4120                                 ro = &iproute;
4121                                 memset(&iproute, 0, sizeof(iproute));
4122                                 memcpy(&ro->ro_dst, to, to->sa_len);
4123                         } else {
4124                                 ro = (sctp_route_t *) & net->ro;
4125                         }
4126                         /* Now the address selection part */
4127                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4128
4129                         /* call the routine to select the src address */
4130                         if (net && out_of_asoc_ok == 0) {
4131                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4132                                         sctp_free_ifa(net->ro._s_addr);
4133                                         net->ro._s_addr = NULL;
4134                                         net->src_addr_selected = 0;
4135                                         if (ro->ro_rt) {
4136                                                 RTFREE(ro->ro_rt);
4137                                                 ro->ro_rt = NULL;
4138                                         }
4139                                 }
4140                                 if (net->src_addr_selected == 0) {
4141                                         /* Cache the source address */
4142                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4143                                             ro, net, 0,
4144                                             vrf_id);
4145                                         net->src_addr_selected = 1;
4146                                 }
4147                                 if (net->ro._s_addr == NULL) {
4148                                         /* No route to host */
4149                                         net->src_addr_selected = 0;
4150                                         sctp_handle_no_route(stcb, net, so_locked);
4151                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4152                                         sctp_m_freem(m);
4153                                         return (EHOSTUNREACH);
4154                                 }
4155                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4156                         } else {
4157                                 if (over_addr == NULL) {
4158                                         struct sctp_ifa *_lsrc;
4159
4160                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4161                                             net,
4162                                             out_of_asoc_ok,
4163                                             vrf_id);
4164                                         if (_lsrc == NULL) {
4165                                                 sctp_handle_no_route(stcb, net, so_locked);
4166                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4167                                                 sctp_m_freem(m);
4168                                                 return (EHOSTUNREACH);
4169                                         }
4170                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4171                                         sctp_free_ifa(_lsrc);
4172                                 } else {
4173                                         ip->ip_src = over_addr->sin.sin_addr;
4174                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4175                                 }
4176                         }
4177                         if (port) {
4178                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4179                                         sctp_handle_no_route(stcb, net, so_locked);
4180                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4181                                         sctp_m_freem(m);
4182                                         return (EHOSTUNREACH);
4183                                 }
4184                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4185                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4186                                 udp->uh_dport = port;
4187                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4188                                 if (V_udp_cksum) {
4189                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4190                                 } else {
4191                                         udp->uh_sum = 0;
4192                                 }
4193                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4194                         } else {
4195                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4196                         }
4197
4198                         sctphdr->src_port = src_port;
4199                         sctphdr->dest_port = dest_port;
4200                         sctphdr->v_tag = v_tag;
4201                         sctphdr->checksum = 0;
4202
4203                         /*
4204                          * If source address selection fails and we find no
4205                          * route then the ip_output should fail as well with
4206                          * a NO_ROUTE_TO_HOST type error. We probably should
4207                          * catch that somewhere and abort the association
4208                          * right away (assuming this is an INIT being sent).
4209                          */
4210                         if (ro->ro_rt == NULL) {
4211                                 /*
4212                                  * src addr selection failed to find a route
4213                                  * (or valid source addr), so we can't get
4214                                  * there from here (yet)!
4215                                  */
4216                                 sctp_handle_no_route(stcb, net, so_locked);
4217                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4218                                 sctp_m_freem(m);
4219                                 return (EHOSTUNREACH);
4220                         }
4221                         if (ro != &iproute) {
4222                                 memcpy(&iproute, ro, sizeof(*ro));
4223                         }
4224                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4225                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4226                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4227                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4228                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4229                             (void *)ro->ro_rt);
4230
4231                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4232                                 /* failed to prepend data, give up */
4233                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4234                                 sctp_m_freem(m);
4235                                 return (ENOMEM);
4236                         }
4237                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4238                         if (port) {
4239 #if defined(SCTP_WITH_NO_CSUM)
4240                                 SCTP_STAT_INCR(sctps_sendnocrc);
4241 #else
4242                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4243                                 SCTP_STAT_INCR(sctps_sendswcrc);
4244 #endif
4245                                 if (V_udp_cksum) {
4246                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4247                                 }
4248                         } else {
4249 #if defined(SCTP_WITH_NO_CSUM)
4250                                 SCTP_STAT_INCR(sctps_sendnocrc);
4251 #else
4252                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4253                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4254                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4255 #endif
4256                         }
4257 #ifdef SCTP_PACKET_LOGGING
4258                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4259                                 sctp_packet_log(o_pak);
4260 #endif
4261                         /* send it out.  table id is taken from stcb */
4262 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4263                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4264                                 so = SCTP_INP_SO(inp);
4265                                 SCTP_SOCKET_UNLOCK(so, 0);
4266                         }
4267 #endif
4268                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4269 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4270                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4271                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4272                                 SCTP_TCB_UNLOCK(stcb);
4273                                 SCTP_SOCKET_LOCK(so, 0);
4274                                 SCTP_TCB_LOCK(stcb);
4275                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4276                         }
4277 #endif
4278                         SCTP_STAT_INCR(sctps_sendpackets);
4279                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4280                         if (ret)
4281                                 SCTP_STAT_INCR(sctps_senderrors);
4282
4283                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4284                         if (net == NULL) {
4285                                 /* free tempy routes */
4286                                 RO_RTFREE(ro);
4287                         } else {
4288                                 /*
4289                                  * PMTU check versus smallest asoc MTU goes
4290                                  * here
4291                                  */
4292                                 if ((ro->ro_rt != NULL) &&
4293                                     (net->ro._s_addr)) {
4294                                         uint32_t mtu;
4295
4296                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4297                                         if (net->port) {
4298                                                 mtu -= sizeof(struct udphdr);
4299                                         }
4300                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4301                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4302                                                 net->mtu = mtu;
4303                                         }
4304                                 } else if (ro->ro_rt == NULL) {
4305                                         /* route was freed */
4306                                         if (net->ro._s_addr &&
4307                                             net->src_addr_selected) {
4308                                                 sctp_free_ifa(net->ro._s_addr);
4309                                                 net->ro._s_addr = NULL;
4310                                         }
4311                                         net->src_addr_selected = 0;
4312                                 }
4313                         }
4314                         return (ret);
4315                 }
4316 #endif
4317 #ifdef INET6
4318         case AF_INET6:
4319                 {
4320                         uint32_t flowlabel, flowinfo;
4321                         struct ip6_hdr *ip6h;
4322                         struct route_in6 ip6route;
4323                         struct ifnet *ifp;
4324                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4325                         int prev_scope = 0;
4326                         struct sockaddr_in6 lsa6_storage;
4327                         int error;
4328                         u_short prev_port = 0;
4329                         int len;
4330
4331                         if (net) {
4332                                 flowlabel = net->flowlabel;
4333                         } else if (stcb) {
4334                                 flowlabel = stcb->asoc.default_flowlabel;
4335                         } else {
4336                                 flowlabel = inp->sctp_ep.default_flowlabel;
4337                         }
4338                         if (flowlabel == 0) {
4339                                 /*
4340                                  * This means especially, that it is not set
4341                                  * at the SCTP layer. So use the value from
4342                                  * the IP layer.
4343                                  */
4344                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4345                         }
4346                         flowlabel &= 0x000fffff;
4347                         len = SCTP_MIN_OVERHEAD;
4348                         if (port) {
4349                                 len += sizeof(struct udphdr);
4350                         }
4351                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4352                         if (newm == NULL) {
4353                                 sctp_m_freem(m);
4354                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4355                                 return (ENOMEM);
4356                         }
4357                         SCTP_ALIGN_TO_END(newm, len);
4358                         SCTP_BUF_LEN(newm) = len;
4359                         SCTP_BUF_NEXT(newm) = m;
4360                         m = newm;
4361                         if (net != NULL) {
4362                                 m->m_pkthdr.flowid = net->flowid;
4363                                 M_HASHTYPE_SET(m, net->flowtype);
4364                         } else {
4365                                 m->m_pkthdr.flowid = mflowid;
4366                                 M_HASHTYPE_SET(m, mflowtype);
4367                         }
4368                         packet_length = sctp_calculate_len(m);
4369
4370                         ip6h = mtod(m, struct ip6_hdr *);
4371                         /* protect *sin6 from overwrite */
4372                         sin6 = (struct sockaddr_in6 *)to;
4373                         tmp = *sin6;
4374                         sin6 = &tmp;
4375
4376                         /* KAME hack: embed scopeid */
4377                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4378                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4379                                 return (EINVAL);
4380                         }
4381                         if (net == NULL) {
4382                                 memset(&ip6route, 0, sizeof(ip6route));
4383                                 ro = (sctp_route_t *) & ip6route;
4384                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4385                         } else {
4386                                 ro = (sctp_route_t *) & net->ro;
4387                         }
4388                         /*
4389                          * We assume here that inp_flow is in host byte
4390                          * order within the TCB!
4391                          */
4392                         if (tos_value == 0) {
4393                                 /*
4394                                  * This means especially, that it is not set
4395                                  * at the SCTP layer. So use the value from
4396                                  * the IP layer.
4397                                  */
4398                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4399                         }
4400                         tos_value &= 0xfc;
4401                         if (ecn_ok) {
4402                                 tos_value |= sctp_get_ect(stcb);
4403                         }
4404                         flowinfo = 0x06;
4405                         flowinfo <<= 8;
4406                         flowinfo |= tos_value;
4407                         flowinfo <<= 20;
4408                         flowinfo |= flowlabel;
4409                         ip6h->ip6_flow = htonl(flowinfo);
4410                         if (port) {
4411                                 ip6h->ip6_nxt = IPPROTO_UDP;
4412                         } else {
4413                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4414                         }
4415                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4416                         ip6h->ip6_dst = sin6->sin6_addr;
4417
4418                         /*
4419                          * Add SRC address selection here: we can only reuse
4420                          * to a limited degree the kame src-addr-sel, since
4421                          * we can try their selection but it may not be
4422                          * bound.
4423                          */
4424                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4425                         lsa6_tmp.sin6_family = AF_INET6;
4426                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4427                         lsa6 = &lsa6_tmp;
4428                         if (net && out_of_asoc_ok == 0) {
4429                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4430                                         sctp_free_ifa(net->ro._s_addr);
4431                                         net->ro._s_addr = NULL;
4432                                         net->src_addr_selected = 0;
4433                                         if (ro->ro_rt) {
4434                                                 RTFREE(ro->ro_rt);
4435                                                 ro->ro_rt = NULL;
4436                                         }
4437                                 }
4438                                 if (net->src_addr_selected == 0) {
4439                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4440                                         /* KAME hack: embed scopeid */
4441                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4442                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4443                                                 return (EINVAL);
4444                                         }
4445                                         /* Cache the source address */
4446                                         net->ro._s_addr = sctp_source_address_selection(inp,
4447                                             stcb,
4448                                             ro,
4449                                             net,
4450                                             0,
4451                                             vrf_id);
4452                                         (void)sa6_recoverscope(sin6);
4453                                         net->src_addr_selected = 1;
4454                                 }
4455                                 if (net->ro._s_addr == NULL) {
4456                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4457                                         net->src_addr_selected = 0;
4458                                         sctp_handle_no_route(stcb, net, so_locked);
4459                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4460                                         sctp_m_freem(m);
4461                                         return (EHOSTUNREACH);
4462                                 }
4463                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4464                         } else {
4465                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4466                                 /* KAME hack: embed scopeid */
4467                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4468                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4469                                         return (EINVAL);
4470                                 }
4471                                 if (over_addr == NULL) {
4472                                         struct sctp_ifa *_lsrc;
4473
4474                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4475                                             net,
4476                                             out_of_asoc_ok,
4477                                             vrf_id);
4478                                         if (_lsrc == NULL) {
4479                                                 sctp_handle_no_route(stcb, net, so_locked);
4480                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4481                                                 sctp_m_freem(m);
4482                                                 return (EHOSTUNREACH);
4483                                         }
4484                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4485                                         sctp_free_ifa(_lsrc);
4486                                 } else {
4487                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4488                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4489                                 }
4490                                 (void)sa6_recoverscope(sin6);
4491                         }
4492                         lsa6->sin6_port = inp->sctp_lport;
4493
4494                         if (ro->ro_rt == NULL) {
4495                                 /*
4496                                  * src addr selection failed to find a route
4497                                  * (or valid source addr), so we can't get
4498                                  * there from here!
4499                                  */
4500                                 sctp_handle_no_route(stcb, net, so_locked);
4501                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4502                                 sctp_m_freem(m);
4503                                 return (EHOSTUNREACH);
4504                         }
4505                         /*
4506                          * XXX: sa6 may not have a valid sin6_scope_id in
4507                          * the non-SCOPEDROUTING case.
4508                          */
4509                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4510                         lsa6_storage.sin6_family = AF_INET6;
4511                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4512                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4513                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4514                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4515                                 sctp_m_freem(m);
4516                                 return (error);
4517                         }
4518                         /* XXX */
4519                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4520                         lsa6_storage.sin6_port = inp->sctp_lport;
4521                         lsa6 = &lsa6_storage;
4522                         ip6h->ip6_src = lsa6->sin6_addr;
4523
4524                         if (port) {
4525                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4526                                         sctp_handle_no_route(stcb, net, so_locked);
4527                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4528                                         sctp_m_freem(m);
4529                                         return (EHOSTUNREACH);
4530                                 }
4531                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4532                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4533                                 udp->uh_dport = port;
4534                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4535                                 udp->uh_sum = 0;
4536                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4537                         } else {
4538                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4539                         }
4540
4541                         sctphdr->src_port = src_port;
4542                         sctphdr->dest_port = dest_port;
4543                         sctphdr->v_tag = v_tag;
4544                         sctphdr->checksum = 0;
4545
4546                         /*
4547                          * We set the hop limit now since there is a good
4548                          * chance that our ro pointer is now filled
4549                          */
4550                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4551                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4552
4553 #ifdef SCTP_DEBUG
4554                         /* Copy to be sure something bad is not happening */
4555                         sin6->sin6_addr = ip6h->ip6_dst;
4556                         lsa6->sin6_addr = ip6h->ip6_src;
4557 #endif
4558
4559                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4560                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4561                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4562                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4563                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4564                         if (net) {
4565                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4566                                 /*
4567                                  * preserve the port and scope for link
4568                                  * local send
4569                                  */
4570                                 prev_scope = sin6->sin6_scope_id;
4571                                 prev_port = sin6->sin6_port;
4572                         }
4573                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4574                                 /* failed to prepend data, give up */
4575                                 sctp_m_freem(m);
4576                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4577                                 return (ENOMEM);
4578                         }
4579                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4580                         if (port) {
4581 #if defined(SCTP_WITH_NO_CSUM)
4582                                 SCTP_STAT_INCR(sctps_sendnocrc);
4583 #else
4584                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4585                                 SCTP_STAT_INCR(sctps_sendswcrc);
4586 #endif
4587                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4588                                         udp->uh_sum = 0xffff;
4589                                 }
4590                         } else {
4591 #if defined(SCTP_WITH_NO_CSUM)
4592                                 SCTP_STAT_INCR(sctps_sendnocrc);
4593 #else
4594                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4595                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4596                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4597 #endif
4598                         }
4599                         /* send it out. table id is taken from stcb */
4600 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4601                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4602                                 so = SCTP_INP_SO(inp);
4603                                 SCTP_SOCKET_UNLOCK(so, 0);
4604                         }
4605 #endif
4606 #ifdef SCTP_PACKET_LOGGING
4607                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4608                                 sctp_packet_log(o_pak);
4609 #endif
4610                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4611 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4612                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4613                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4614                                 SCTP_TCB_UNLOCK(stcb);
4615                                 SCTP_SOCKET_LOCK(so, 0);
4616                                 SCTP_TCB_LOCK(stcb);
4617                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4618                         }
4619 #endif
4620                         if (net) {
4621                                 /* for link local this must be done */
4622                                 sin6->sin6_scope_id = prev_scope;
4623                                 sin6->sin6_port = prev_port;
4624                         }
4625                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4626                         SCTP_STAT_INCR(sctps_sendpackets);
4627                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4628                         if (ret) {
4629                                 SCTP_STAT_INCR(sctps_senderrors);
4630                         }
4631                         if (net == NULL) {
4632                                 /* Now if we had a temp route free it */
4633                                 RO_RTFREE(ro);
4634                         } else {
4635                                 /*
4636                                  * PMTU check versus smallest asoc MTU goes
4637                                  * here
4638                                  */
4639                                 if (ro->ro_rt == NULL) {
4640                                         /* Route was freed */
4641                                         if (net->ro._s_addr &&
4642                                             net->src_addr_selected) {
4643                                                 sctp_free_ifa(net->ro._s_addr);
4644                                                 net->ro._s_addr = NULL;
4645                                         }
4646                                         net->src_addr_selected = 0;
4647                                 }
4648                                 if ((ro->ro_rt != NULL) &&
4649                                     (net->ro._s_addr)) {
4650                                         uint32_t mtu;
4651
4652                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4653                                         if (mtu &&
4654                                             (stcb->asoc.smallest_mtu > mtu)) {
4655                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4656                                                 net->mtu = mtu;
4657                                                 if (net->port) {
4658                                                         net->mtu -= sizeof(struct udphdr);
4659                                                 }
4660                                         }
4661                                 } else if (ifp) {
4662                                         if (ND_IFINFO(ifp)->linkmtu &&
4663                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4664                                                 sctp_mtu_size_reset(inp,
4665                                                     &stcb->asoc,
4666                                                     ND_IFINFO(ifp)->linkmtu);
4667                                         }
4668                                 }
4669                         }
4670                         return (ret);
4671                 }
4672 #endif
4673         default:
4674                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4675                     ((struct sockaddr *)to)->sa_family);
4676                 sctp_m_freem(m);
4677                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4678                 return (EFAULT);
4679         }
4680 }
4681
4682
4683 void
4684 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4685 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4686     SCTP_UNUSED
4687 #endif
4688 )
4689 {
4690         struct mbuf *m, *m_last;
4691         struct sctp_nets *net;
4692         struct sctp_init_chunk *init;
4693         struct sctp_supported_addr_param *sup_addr;
4694         struct sctp_adaptation_layer_indication *ali;
4695         struct sctp_supported_chunk_types_param *pr_supported;
4696         struct sctp_paramhdr *ph;
4697         int cnt_inits_to = 0;
4698         int ret;
4699         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4700
4701         /* INIT's always go to the primary (and usually ONLY address) */
4702         net = stcb->asoc.primary_destination;
4703         if (net == NULL) {
4704                 net = TAILQ_FIRST(&stcb->asoc.nets);
4705                 if (net == NULL) {
4706                         /* TSNH */
4707                         return;
4708                 }
4709                 /* we confirm any address we send an INIT to */
4710                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4711                 (void)sctp_set_primary_addr(stcb, NULL, net);
4712         } else {
4713                 /* we confirm any address we send an INIT to */
4714                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4715         }
4716         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4717 #ifdef INET6
4718         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4719                 /*
4720                  * special hook, if we are sending to link local it will not
4721                  * show up in our private address count.
4722                  */
4723                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4724                         cnt_inits_to = 1;
4725         }
4726 #endif
4727         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4728                 /* This case should not happen */
4729                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4730                 return;
4731         }
4732         /* start the INIT timer */
4733         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4734
4735         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4736         if (m == NULL) {
4737                 /* No memory, INIT timer will re-attempt. */
4738                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4739                 return;
4740         }
4741         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4742         padding_len = 0;
4743         /* Now lets put the chunk header in place */
4744         init = mtod(m, struct sctp_init_chunk *);
4745         /* now the chunk header */
4746         init->ch.chunk_type = SCTP_INITIATION;
4747         init->ch.chunk_flags = 0;
4748         /* fill in later from mbuf we build */
4749         init->ch.chunk_length = 0;
4750         /* place in my tag */
4751         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4752         /* set up some of the credits. */
4753         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4754             SCTP_MINIMAL_RWND));
4755         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4756         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4757         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4758
4759         /* Adaptation layer indication parameter */
4760         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4761                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4762                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4763                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4764                 ali->ph.param_length = htons(parameter_len);
4765                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4766                 chunk_len += parameter_len;
4767         }
4768         /* ECN parameter */
4769         if (stcb->asoc.ecn_supported == 1) {
4770                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4771                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4772                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4773                 ph->param_length = htons(parameter_len);
4774                 chunk_len += parameter_len;
4775         }
4776         /* PR-SCTP supported parameter */
4777         if (stcb->asoc.prsctp_supported == 1) {
4778                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4779                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4780                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4781                 ph->param_length = htons(parameter_len);
4782                 chunk_len += parameter_len;
4783         }
4784         /* Add NAT friendly parameter. */
4785         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4786                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4787                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4788                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4789                 ph->param_length = htons(parameter_len);
4790                 chunk_len += parameter_len;
4791         }
4792         /* And now tell the peer which extensions we support */
4793         num_ext = 0;
4794         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4795         if (stcb->asoc.prsctp_supported == 1) {
4796                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4797         }
4798         if (stcb->asoc.auth_supported == 1) {
4799                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4800         }
4801         if (stcb->asoc.asconf_supported == 1) {
4802                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4803                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4804         }
4805         if (stcb->asoc.reconfig_supported == 1) {
4806                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4807         }
4808         if (stcb->asoc.nrsack_supported == 1) {
4809                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4810         }
4811         if (stcb->asoc.pktdrop_supported == 1) {
4812                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4813         }
4814         if (num_ext > 0) {
4815                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4816                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4817                 pr_supported->ph.param_length = htons(parameter_len);
4818                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4819                 chunk_len += parameter_len;
4820         }
4821         /* add authentication parameters */
4822         if (stcb->asoc.auth_supported) {
4823                 /* attach RANDOM parameter, if available */
4824                 if (stcb->asoc.authinfo.random != NULL) {
4825                         struct sctp_auth_random *randp;
4826
4827                         if (padding_len > 0) {
4828                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4829                                 chunk_len += padding_len;
4830                                 padding_len = 0;
4831                         }
4832                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4833                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4834                         /* random key already contains the header */
4835                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4836                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4837                         chunk_len += parameter_len;
4838                 }
4839                 /* add HMAC_ALGO parameter */
4840                 if (stcb->asoc.local_hmacs != NULL) {
4841                         struct sctp_auth_hmac_algo *hmacs;
4842
4843                         if (padding_len > 0) {
4844                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4845                                 chunk_len += padding_len;
4846                                 padding_len = 0;
4847                         }
4848                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4849                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4850                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4851                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4852                         hmacs->ph.param_length = htons(parameter_len);
4853                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4854                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4855                         chunk_len += parameter_len;
4856                 }
4857                 /* add CHUNKS parameter */
4858                 if (stcb->asoc.local_auth_chunks != NULL) {
4859                         struct sctp_auth_chunk_list *chunks;
4860
4861                         if (padding_len > 0) {
4862                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4863                                 chunk_len += padding_len;
4864                                 padding_len = 0;
4865                         }
4866                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4867                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4868                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4869                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4870                         chunks->ph.param_length = htons(parameter_len);
4871                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4872                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4873                         chunk_len += parameter_len;
4874                 }
4875         }
4876         /* now any cookie time extensions */
4877         if (stcb->asoc.cookie_preserve_req) {
4878                 struct sctp_cookie_perserve_param *cookie_preserve;
4879
4880                 if (padding_len > 0) {
4881                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4882                         chunk_len += padding_len;
4883                         padding_len = 0;
4884                 }
4885                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4886                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4887                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4888                 cookie_preserve->ph.param_length = htons(parameter_len);
4889                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4890                 stcb->asoc.cookie_preserve_req = 0;
4891                 chunk_len += parameter_len;
4892         }
4893         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4894                 uint8_t i;
4895
4896                 if (padding_len > 0) {
4897                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4898                         chunk_len += padding_len;
4899                         padding_len = 0;
4900                 }
4901                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4902                 if (stcb->asoc.scope.ipv4_addr_legal) {
4903                         parameter_len += (uint16_t) sizeof(uint16_t);
4904                 }
4905                 if (stcb->asoc.scope.ipv6_addr_legal) {
4906                         parameter_len += (uint16_t) sizeof(uint16_t);
4907                 }
4908                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4909                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4910                 sup_addr->ph.param_length = htons(parameter_len);
4911                 i = 0;
4912                 if (stcb->asoc.scope.ipv4_addr_legal) {
4913                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4914                 }
4915                 if (stcb->asoc.scope.ipv6_addr_legal) {
4916                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4917                 }
4918                 padding_len = 4 - 2 * i;
4919                 chunk_len += parameter_len;
4920         }
4921         SCTP_BUF_LEN(m) = chunk_len;
4922         /* now the addresses */
4923         /*
4924          * To optimize this we could put the scoping stuff into a structure
4925          * and remove the individual uint8's from the assoc structure. Then
4926          * we could just sifa in the address within the stcb. But for now
4927          * this is a quick hack to get the address stuff teased apart.
4928          */
4929         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4930             m, cnt_inits_to,
4931             &padding_len, &chunk_len);
4932
4933         init->ch.chunk_length = htons(chunk_len);
4934         if (padding_len > 0) {
4935                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4936                         sctp_m_freem(m);
4937                         return;
4938                 }
4939         }
4940         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4941         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4942             (struct sockaddr *)&net->ro._l_addr,
4943             m, 0, NULL, 0, 0, 0, 0,
4944             inp->sctp_lport, stcb->rport, htonl(0),
4945             net->port, NULL,
4946             0, 0,
4947             so_locked);
4948         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4949         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4950         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4951 }
4952
4953 struct mbuf *
4954 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4955     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4956 {
4957         /*
4958          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4959          * being equal to the beginning of the params i.e. (iphlen +
4960          * sizeof(struct sctp_init_msg) parse through the parameters to the
4961          * end of the mbuf verifying that all parameters are known.
4962          *
4963          * For unknown parameters build and return a mbuf with
4964          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4965          * processing this chunk stop, and set *abort_processing to 1.
4966          *
4967          * By having param_offset be pre-set to where parameters begin it is
4968          * hoped that this routine may be reused in the future by new
4969          * features.
4970          */
4971         struct sctp_paramhdr *phdr, params;
4972
4973         struct mbuf *mat, *op_err;
4974         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4975         int at, limit, pad_needed;
4976         uint16_t ptype, plen, padded_size;
4977         int err_at;
4978
4979         *abort_processing = 0;
4980         mat = in_initpkt;
4981         err_at = 0;
4982         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4983         at = param_offset;
4984         op_err = NULL;
4985         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4986         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4987         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4988                 ptype = ntohs(phdr->param_type);
4989                 plen = ntohs(phdr->param_length);
4990                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4991                         /* wacked parameter */
4992                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4993                         goto invalid_size;
4994                 }
4995                 limit -= SCTP_SIZE32(plen);
4996                 /*-
4997                  * All parameters for all chunks that we know/understand are
4998                  * listed here. We process them other places and make
4999                  * appropriate stop actions per the upper bits. However this
5000                  * is the generic routine processor's can call to get back
5001                  * an operr.. to either incorporate (init-ack) or send.
5002                  */
5003                 padded_size = SCTP_SIZE32(plen);
5004                 switch (ptype) {
5005                         /* Param's with variable size */
5006                 case SCTP_HEARTBEAT_INFO:
5007                 case SCTP_STATE_COOKIE:
5008                 case SCTP_UNRECOG_PARAM:
5009                 case SCTP_ERROR_CAUSE_IND:
5010                         /* ok skip fwd */
5011                         at += padded_size;
5012                         break;
5013                         /* Param's with variable size within a range */
5014                 case SCTP_CHUNK_LIST:
5015                 case SCTP_SUPPORTED_CHUNK_EXT:
5016                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5017                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5018                                 goto invalid_size;
5019                         }
5020                         at += padded_size;
5021                         break;
5022                 case SCTP_SUPPORTED_ADDRTYPE:
5023                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5024                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5025                                 goto invalid_size;
5026                         }
5027                         at += padded_size;
5028                         break;
5029                 case SCTP_RANDOM:
5030                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5031                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5032                                 goto invalid_size;
5033                         }
5034                         at += padded_size;
5035                         break;
5036                 case SCTP_SET_PRIM_ADDR:
5037                 case SCTP_DEL_IP_ADDRESS:
5038                 case SCTP_ADD_IP_ADDRESS:
5039                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5040                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                         /* Param's with a fixed size */
5047                 case SCTP_IPV4_ADDRESS:
5048                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5049                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5050                                 goto invalid_size;
5051                         }
5052                         at += padded_size;
5053                         break;
5054                 case SCTP_IPV6_ADDRESS:
5055                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5056                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5057                                 goto invalid_size;
5058                         }
5059                         at += padded_size;
5060                         break;
5061                 case SCTP_COOKIE_PRESERVE:
5062                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5063                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5064                                 goto invalid_size;
5065                         }
5066                         at += padded_size;
5067                         break;
5068                 case SCTP_HAS_NAT_SUPPORT:
5069                         *nat_friendly = 1;
5070                         /* fall through */
5071                 case SCTP_PRSCTP_SUPPORTED:
5072                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_ECN_CAPABLE:
5079                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5081                                 goto invalid_size;
5082                         }
5083                         at += padded_size;
5084                         break;
5085                 case SCTP_ULP_ADAPTATION:
5086                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5087                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5088                                 goto invalid_size;
5089                         }
5090                         at += padded_size;
5091                         break;
5092                 case SCTP_SUCCESS_REPORT:
5093                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5094                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5095                                 goto invalid_size;
5096                         }
5097                         at += padded_size;
5098                         break;
5099                 case SCTP_HOSTNAME_ADDRESS:
5100                         {
5101                                 /* We can NOT handle HOST NAME addresses!! */
5102                                 int l_len;
5103
5104                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5105                                 *abort_processing = 1;
5106                                 if (op_err == NULL) {
5107                                         /* Ok need to try to get a mbuf */
5108 #ifdef INET6
5109                                         l_len = SCTP_MIN_OVERHEAD;
5110 #else
5111                                         l_len = SCTP_MIN_V4_OVERHEAD;
5112 #endif
5113                                         l_len += sizeof(struct sctp_chunkhdr);
5114                                         l_len += plen;
5115                                         l_len += sizeof(struct sctp_paramhdr);
5116                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5117                                         if (op_err) {
5118                                                 SCTP_BUF_LEN(op_err) = 0;
5119                                                 /*
5120                                                  * pre-reserve space for ip
5121                                                  * and sctp header  and
5122                                                  * chunk hdr
5123                                                  */
5124 #ifdef INET6
5125                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5126 #else
5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5128 #endif
5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5130                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5131                                         }
5132                                 }
5133                                 if (op_err) {
5134                                         /* If we have space */
5135                                         struct sctp_paramhdr s;
5136
5137                                         if (err_at % 4) {
5138                                                 uint32_t cpthis = 0;
5139
5140                                                 pad_needed = 4 - (err_at % 4);
5141                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5142                                                 err_at += pad_needed;
5143                                         }
5144                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5145                                         s.param_length = htons(sizeof(s) + plen);
5146                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5147                                         err_at += sizeof(s);
5148                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5149                                         if (phdr == NULL) {
5150                                                 sctp_m_freem(op_err);
5151                                                 /*
5152                                                  * we are out of memory but
5153                                                  * we still need to have a
5154                                                  * look at what to do (the
5155                                                  * system is in trouble
5156                                                  * though).
5157                                                  */
5158                                                 return (NULL);
5159                                         }
5160                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5161                                 }
5162                                 return (op_err);
5163                                 break;
5164                         }
5165                 default:
5166                         /*
5167                          * we do not recognize the parameter figure out what
5168                          * we do.
5169                          */
5170                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5171                         if ((ptype & 0x4000) == 0x4000) {
5172                                 /* Report bit is set?? */
5173                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5174                                 if (op_err == NULL) {
5175                                         int l_len;
5176
5177                                         /* Ok need to try to get an mbuf */
5178 #ifdef INET6
5179                                         l_len = SCTP_MIN_OVERHEAD;
5180 #else
5181                                         l_len = SCTP_MIN_V4_OVERHEAD;
5182 #endif
5183                                         l_len += sizeof(struct sctp_chunkhdr);
5184                                         l_len += plen;
5185                                         l_len += sizeof(struct sctp_paramhdr);
5186                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5187                                         if (op_err) {
5188                                                 SCTP_BUF_LEN(op_err) = 0;
5189 #ifdef INET6
5190                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5191 #else
5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5193 #endif
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5195                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5196                                         }
5197                                 }
5198                                 if (op_err) {
5199                                         /* If we have space */
5200                                         struct sctp_paramhdr s;
5201
5202                                         if (err_at % 4) {
5203                                                 uint32_t cpthis = 0;
5204
5205                                                 pad_needed = 4 - (err_at % 4);
5206                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5207                                                 err_at += pad_needed;
5208                                         }
5209                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5210                                         s.param_length = htons(sizeof(s) + plen);
5211                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5212                                         err_at += sizeof(s);
5213                                         if (plen > sizeof(tempbuf)) {
5214                                                 plen = sizeof(tempbuf);
5215                                         }
5216                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5217                                         if (phdr == NULL) {
5218                                                 sctp_m_freem(op_err);
5219                                                 /*
5220                                                  * we are out of memory but
5221                                                  * we still need to have a
5222                                                  * look at what to do (the
5223                                                  * system is in trouble
5224                                                  * though).
5225                                                  */
5226                                                 op_err = NULL;
5227                                                 goto more_processing;
5228                                         }
5229                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5230                                         err_at += plen;
5231                                 }
5232                         }
5233         more_processing:
5234                         if ((ptype & 0x8000) == 0x0000) {
5235                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5236                                 return (op_err);
5237                         } else {
5238                                 /* skip this chunk and continue processing */
5239                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5240                                 at += SCTP_SIZE32(plen);
5241                         }
5242                         break;
5243
5244                 }
5245                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5246         }
5247         return (op_err);
5248 invalid_size:
5249         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5250         *abort_processing = 1;
5251         if ((op_err == NULL) && phdr) {
5252                 int l_len;
5253
5254 #ifdef INET6
5255                 l_len = SCTP_MIN_OVERHEAD;
5256 #else
5257                 l_len = SCTP_MIN_V4_OVERHEAD;
5258 #endif
5259                 l_len += sizeof(struct sctp_chunkhdr);
5260                 l_len += (2 * sizeof(struct sctp_paramhdr));
5261                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5262                 if (op_err) {
5263                         SCTP_BUF_LEN(op_err) = 0;
5264 #ifdef INET6
5265                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5266 #else
5267                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5268 #endif
5269                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5270                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5271                 }
5272         }
5273         if ((op_err) && phdr) {
5274                 struct sctp_paramhdr s;
5275
5276                 if (err_at % 4) {
5277                         uint32_t cpthis = 0;
5278
5279                         pad_needed = 4 - (err_at % 4);
5280                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5281                         err_at += pad_needed;
5282                 }
5283                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5284                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5285                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5286                 err_at += sizeof(s);
5287                 /* Only copy back the p-hdr that caused the issue */
5288                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5289         }
5290         return (op_err);
5291 }
5292
5293 static int
5294 sctp_are_there_new_addresses(struct sctp_association *asoc,
5295     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5296 {
5297         /*
5298          * Given a INIT packet, look through the packet to verify that there
5299          * are NO new addresses. As we go through the parameters add reports
5300          * of any un-understood parameters that require an error.  Also we
5301          * must return (1) to drop the packet if we see a un-understood
5302          * parameter that tells us to drop the chunk.
5303          */
5304         struct sockaddr *sa_touse;
5305         struct sockaddr *sa;
5306         struct sctp_paramhdr *phdr, params;
5307         uint16_t ptype, plen;
5308         uint8_t fnd;
5309         struct sctp_nets *net;
5310
5311 #ifdef INET
5312         struct sockaddr_in sin4, *sa4;
5313
5314 #endif
5315 #ifdef INET6
5316         struct sockaddr_in6 sin6, *sa6;
5317
5318 #endif
5319
5320 #ifdef INET
5321         memset(&sin4, 0, sizeof(sin4));
5322         sin4.sin_family = AF_INET;
5323         sin4.sin_len = sizeof(sin4);
5324 #endif
5325 #ifdef INET6
5326         memset(&sin6, 0, sizeof(sin6));
5327         sin6.sin6_family = AF_INET6;
5328         sin6.sin6_len = sizeof(sin6);
5329 #endif
5330         /* First what about the src address of the pkt ? */
5331         fnd = 0;
5332         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5333                 sa = (struct sockaddr *)&net->ro._l_addr;
5334                 if (sa->sa_family == src->sa_family) {
5335 #ifdef INET
5336                         if (sa->sa_family == AF_INET) {
5337                                 struct sockaddr_in *src4;
5338
5339                                 sa4 = (struct sockaddr_in *)sa;
5340                                 src4 = (struct sockaddr_in *)src;
5341                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5342                                         fnd = 1;
5343                                         break;
5344                                 }
5345                         }
5346 #endif
5347 #ifdef INET6
5348                         if (sa->sa_family == AF_INET6) {
5349                                 struct sockaddr_in6 *src6;
5350
5351                                 sa6 = (struct sockaddr_in6 *)sa;
5352                                 src6 = (struct sockaddr_in6 *)src;
5353                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5354                                         fnd = 1;
5355                                         break;
5356                                 }
5357                         }
5358 #endif
5359                 }
5360         }
5361         if (fnd == 0) {
5362                 /* New address added! no need to look futher. */
5363                 return (1);
5364         }
5365         /* Ok so far lets munge through the rest of the packet */
5366         offset += sizeof(struct sctp_init_chunk);
5367         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5368         while (phdr) {
5369                 sa_touse = NULL;
5370                 ptype = ntohs(phdr->param_type);
5371                 plen = ntohs(phdr->param_length);
5372                 switch (ptype) {
5373 #ifdef INET
5374                 case SCTP_IPV4_ADDRESS:
5375                         {
5376                                 struct sctp_ipv4addr_param *p4, p4_buf;
5377
5378                                 phdr = sctp_get_next_param(in_initpkt, offset,
5379                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5380                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5381                                     phdr == NULL) {
5382                                         return (1);
5383                                 }
5384                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5385                                 sin4.sin_addr.s_addr = p4->addr;
5386                                 sa_touse = (struct sockaddr *)&sin4;
5387                                 break;
5388                         }
5389 #endif
5390 #ifdef INET6
5391                 case SCTP_IPV6_ADDRESS:
5392                         {
5393                                 struct sctp_ipv6addr_param *p6, p6_buf;
5394
5395                                 phdr = sctp_get_next_param(in_initpkt, offset,
5396                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5397                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5398                                     phdr == NULL) {
5399                                         return (1);
5400                                 }
5401                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5402                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5403                                     sizeof(p6->addr));
5404                                 sa_touse = (struct sockaddr *)&sin6;
5405                                 break;
5406                         }
5407 #endif
5408                 default:
5409                         sa_touse = NULL;
5410                         break;
5411                 }
5412                 if (sa_touse) {
5413                         /* ok, sa_touse points to one to check */
5414                         fnd = 0;
5415                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5416                                 sa = (struct sockaddr *)&net->ro._l_addr;
5417                                 if (sa->sa_family != sa_touse->sa_family) {
5418                                         continue;
5419                                 }
5420 #ifdef INET
5421                                 if (sa->sa_family == AF_INET) {
5422                                         sa4 = (struct sockaddr_in *)sa;
5423                                         if (sa4->sin_addr.s_addr ==
5424                                             sin4.sin_addr.s_addr) {
5425                                                 fnd = 1;
5426                                                 break;
5427                                         }
5428                                 }
5429 #endif
5430 #ifdef INET6
5431                                 if (sa->sa_family == AF_INET6) {
5432                                         sa6 = (struct sockaddr_in6 *)sa;
5433                                         if (SCTP6_ARE_ADDR_EQUAL(
5434                                             sa6, &sin6)) {
5435                                                 fnd = 1;
5436                                                 break;
5437                                         }
5438                                 }
5439 #endif
5440                         }
5441                         if (!fnd) {
5442                                 /* New addr added! no need to look further */
5443                                 return (1);
5444                         }
5445                 }
5446                 offset += SCTP_SIZE32(plen);
5447                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5448         }
5449         return (0);
5450 }
5451
5452 /*
5453  * Given a MBUF chain that was sent into us containing an INIT. Build a
5454  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5455  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5456  * message (i.e. the struct sctp_init_msg).
5457  */
5458 void
5459 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5460     struct mbuf *init_pkt, int iphlen, int offset,
5461     struct sockaddr *src, struct sockaddr *dst,
5462     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5463     uint8_t mflowtype, uint32_t mflowid,
5464     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5465 {
5466         struct sctp_association *asoc;
5467         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5468         struct sctp_init_ack_chunk *initack;
5469         struct sctp_adaptation_layer_indication *ali;
5470         struct sctp_supported_chunk_types_param *pr_supported;
5471         struct sctp_paramhdr *ph;
5472         union sctp_sockstore *over_addr;
5473         struct sctp_scoping scp;
5474
5475 #ifdef INET
5476         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5477         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5478         struct sockaddr_in *sin;
5479
5480 #endif
5481 #ifdef INET6
5482         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5483         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5484         struct sockaddr_in6 *sin6;
5485
5486 #endif
5487         struct sockaddr *to;
5488         struct sctp_state_cookie stc;
5489         struct sctp_nets *net = NULL;
5490         uint8_t *signature = NULL;
5491         int cnt_inits_to = 0;
5492         uint16_t his_limit, i_want;
5493         int abort_flag;
5494         int nat_friendly = 0;
5495         struct socket *so;
5496         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5497
5498         if (stcb) {
5499                 asoc = &stcb->asoc;
5500         } else {
5501                 asoc = NULL;
5502         }
5503         if ((asoc != NULL) &&
5504             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5505             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5506                 /* new addresses, out of here in non-cookie-wait states */
5507                 /*
5508                  * Send a ABORT, we don't add the new address error clause
5509                  * though we even set the T bit and copy in the 0 tag.. this
5510                  * looks no different than if no listener was present.
5511                  */
5512                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5513                     "Address added");
5514                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5515                     mflowtype, mflowid, inp->fibnum,
5516                     vrf_id, port);
5517                 return;
5518         }
5519         abort_flag = 0;
5520         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5521             (offset + sizeof(struct sctp_init_chunk)),
5522             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5523         if (abort_flag) {
5524 do_a_abort:
5525                 if (op_err == NULL) {
5526                         char msg[SCTP_DIAG_INFO_LEN];
5527
5528                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5529                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5530                             msg);
5531                 }
5532                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5533                     init_chk->init.initiate_tag, op_err,
5534                     mflowtype, mflowid, inp->fibnum,
5535                     vrf_id, port);
5536                 return;
5537         }
5538         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5539         if (m == NULL) {
5540                 /* No memory, INIT timer will re-attempt. */
5541                 if (op_err)
5542                         sctp_m_freem(op_err);
5543                 return;
5544         }
5545         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5546         padding_len = 0;
5547
5548         /*
5549          * We might not overwrite the identification[] completely and on
5550          * some platforms time_entered will contain some padding. Therefore
5551          * zero out the cookie to avoid putting uninitialized memory on the
5552          * wire.
5553          */
5554         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5555
5556         /* the time I built cookie */
5557         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5558
5559         /* populate any tie tags */
5560         if (asoc != NULL) {
5561                 /* unlock before tag selections */
5562                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5563                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5564                 stc.cookie_life = asoc->cookie_life;
5565                 net = asoc->primary_destination;
5566         } else {
5567                 stc.tie_tag_my_vtag = 0;
5568                 stc.tie_tag_peer_vtag = 0;
5569                 /* life I will award this cookie */
5570                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5571         }
5572
5573         /* copy in the ports for later check */
5574         stc.myport = sh->dest_port;
5575         stc.peerport = sh->src_port;
5576
5577         /*
5578          * If we wanted to honor cookie life extentions, we would add to
5579          * stc.cookie_life. For now we should NOT honor any extension
5580          */
5581         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5582         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5583                 stc.ipv6_addr_legal = 1;
5584                 if (SCTP_IPV6_V6ONLY(inp)) {
5585                         stc.ipv4_addr_legal = 0;
5586                 } else {
5587                         stc.ipv4_addr_legal = 1;
5588                 }
5589         } else {
5590                 stc.ipv6_addr_legal = 0;
5591                 stc.ipv4_addr_legal = 1;
5592         }
5593         stc.ipv4_scope = 0;
5594         if (net == NULL) {
5595                 to = src;
5596                 switch (dst->sa_family) {
5597 #ifdef INET
5598                 case AF_INET:
5599                         {
5600                                 /* lookup address */
5601                                 stc.address[0] = src4->sin_addr.s_addr;
5602                                 stc.address[1] = 0;
5603                                 stc.address[2] = 0;
5604                                 stc.address[3] = 0;
5605                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5606                                 /* local from address */
5607                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5608                                 stc.laddress[1] = 0;
5609                                 stc.laddress[2] = 0;
5610                                 stc.laddress[3] = 0;
5611                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5612                                 /* scope_id is only for v6 */
5613                                 stc.scope_id = 0;
5614                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5615                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5616                                         stc.ipv4_scope = 1;
5617                                 }
5618                                 /* Must use the address in this case */
5619                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5620                                         stc.loopback_scope = 1;
5621                                         stc.ipv4_scope = 1;
5622                                         stc.site_scope = 1;
5623                                         stc.local_scope = 0;
5624                                 }
5625                                 break;
5626                         }
5627 #endif
5628 #ifdef INET6
5629                 case AF_INET6:
5630                         {
5631                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5632                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5633                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5634                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5635                                         stc.loopback_scope = 1;
5636                                         stc.local_scope = 0;
5637                                         stc.site_scope = 1;
5638                                         stc.ipv4_scope = 1;
5639                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5640                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5641                                         /*
5642                                          * If the new destination or source
5643                                          * is a LINK_LOCAL we must have
5644                                          * common both site and local scope.
5645                                          * Don't set local scope though
5646                                          * since we must depend on the
5647                                          * source to be added implicitly. We
5648                                          * cannot assure just because we
5649                                          * share one link that all links are
5650                                          * common.
5651                                          */
5652                                         stc.local_scope = 0;
5653                                         stc.site_scope = 1;
5654                                         stc.ipv4_scope = 1;
5655                                         /*
5656                                          * we start counting for the private
5657                                          * address stuff at 1. since the
5658                                          * link local we source from won't
5659                                          * show up in our scoped count.
5660                                          */
5661                                         cnt_inits_to = 1;
5662                                         /*
5663                                          * pull out the scope_id from
5664                                          * incoming pkt
5665                                          */
5666                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5667                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5668                                         /*
5669                                          * If the new destination or source
5670                                          * is SITE_LOCAL then we must have
5671                                          * site scope in common.
5672                                          */
5673                                         stc.site_scope = 1;
5674                                 }
5675                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5676                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5677                                 break;
5678                         }
5679 #endif
5680                 default:
5681                         /* TSNH */
5682                         goto do_a_abort;
5683                         break;
5684                 }
5685         } else {
5686                 /* set the scope per the existing tcb */
5687
5688 #ifdef INET6
5689                 struct sctp_nets *lnet;
5690
5691 #endif
5692
5693                 stc.loopback_scope = asoc->scope.loopback_scope;
5694                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5695                 stc.site_scope = asoc->scope.site_scope;
5696                 stc.local_scope = asoc->scope.local_scope;
5697 #ifdef INET6
5698                 /* Why do we not consider IPv4 LL addresses? */
5699                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5700                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5701                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5702                                         /*
5703                                          * if we have a LL address, start
5704                                          * counting at 1.
5705                                          */
5706                                         cnt_inits_to = 1;
5707                                 }
5708                         }
5709                 }
5710 #endif
5711                 /* use the net pointer */
5712                 to = (struct sockaddr *)&net->ro._l_addr;
5713                 switch (to->sa_family) {
5714 #ifdef INET
5715                 case AF_INET:
5716                         sin = (struct sockaddr_in *)to;
5717                         stc.address[0] = sin->sin_addr.s_addr;
5718                         stc.address[1] = 0;
5719                         stc.address[2] = 0;
5720                         stc.address[3] = 0;
5721                         stc.addr_type = SCTP_IPV4_ADDRESS;
5722                         if (net->src_addr_selected == 0) {
5723                                 /*
5724                                  * strange case here, the INIT should have
5725                                  * did the selection.
5726                                  */
5727                                 net->ro._s_addr = sctp_source_address_selection(inp,
5728                                     stcb, (sctp_route_t *) & net->ro,
5729                                     net, 0, vrf_id);
5730                                 if (net->ro._s_addr == NULL)
5731                                         return;
5732
5733                                 net->src_addr_selected = 1;
5734
5735                         }
5736                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5737                         stc.laddress[1] = 0;
5738                         stc.laddress[2] = 0;
5739                         stc.laddress[3] = 0;
5740                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5741                         /* scope_id is only for v6 */
5742                         stc.scope_id = 0;
5743                         break;
5744 #endif
5745 #ifdef INET6
5746                 case AF_INET6:
5747                         sin6 = (struct sockaddr_in6 *)to;
5748                         memcpy(&stc.address, &sin6->sin6_addr,
5749                             sizeof(struct in6_addr));
5750                         stc.addr_type = SCTP_IPV6_ADDRESS;
5751                         stc.scope_id = sin6->sin6_scope_id;
5752                         if (net->src_addr_selected == 0) {
5753                                 /*
5754                                  * strange case here, the INIT should have
5755                                  * done the selection.
5756                                  */
5757                                 net->ro._s_addr = sctp_source_address_selection(inp,
5758                                     stcb, (sctp_route_t *) & net->ro,
5759                                     net, 0, vrf_id);
5760                                 if (net->ro._s_addr == NULL)
5761                                         return;
5762
5763                                 net->src_addr_selected = 1;
5764                         }
5765                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5766                             sizeof(struct in6_addr));
5767                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5768                         break;
5769 #endif
5770                 }
5771         }
5772         /* Now lets put the SCTP header in place */
5773         initack = mtod(m, struct sctp_init_ack_chunk *);
5774         /* Save it off for quick ref */
5775         stc.peers_vtag = init_chk->init.initiate_tag;
5776         /* who are we */
5777         memcpy(stc.identification, SCTP_VERSION_STRING,
5778             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5779         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5780         /* now the chunk header */
5781         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5782         initack->ch.chunk_flags = 0;
5783         /* fill in later from mbuf we build */
5784         initack->ch.chunk_length = 0;
5785         /* place in my tag */
5786         if ((asoc != NULL) &&
5787             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5788             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5789             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5790                 /* re-use the v-tags and init-seq here */
5791                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5792                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5793         } else {
5794                 uint32_t vtag, itsn;
5795
5796                 if (hold_inp_lock) {
5797                         SCTP_INP_INCR_REF(inp);
5798                         SCTP_INP_RUNLOCK(inp);
5799                 }
5800                 if (asoc) {
5801                         atomic_add_int(&asoc->refcnt, 1);
5802                         SCTP_TCB_UNLOCK(stcb);
5803         new_tag:
5804                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5805                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5806                                 /*
5807                                  * Got a duplicate vtag on some guy behind a
5808                                  * nat make sure we don't use it.
5809                                  */
5810                                 goto new_tag;
5811                         }
5812                         initack->init.initiate_tag = htonl(vtag);
5813                         /* get a TSN to use too */
5814                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5815                         initack->init.initial_tsn = htonl(itsn);
5816                         SCTP_TCB_LOCK(stcb);
5817                         atomic_add_int(&asoc->refcnt, -1);
5818                 } else {
5819                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5820                         initack->init.initiate_tag = htonl(vtag);
5821                         /* get a TSN to use too */
5822                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5823                 }
5824                 if (hold_inp_lock) {
5825                         SCTP_INP_RLOCK(inp);
5826                         SCTP_INP_DECR_REF(inp);
5827                 }
5828         }
5829         /* save away my tag to */
5830         stc.my_vtag = initack->init.initiate_tag;
5831
5832         /* set up some of the credits. */
5833         so = inp->sctp_socket;
5834         if (so == NULL) {
5835                 /* memory problem */
5836                 sctp_m_freem(m);
5837                 return;
5838         } else {
5839                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5840         }
5841         /* set what I want */
5842         his_limit = ntohs(init_chk->init.num_inbound_streams);
5843         /* choose what I want */
5844         if (asoc != NULL) {
5845                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5846                         i_want = asoc->streamoutcnt;
5847                 } else {
5848                         i_want = asoc->pre_open_streams;
5849                 }
5850         } else {
5851                 i_want = inp->sctp_ep.pre_open_stream_count;
5852         }
5853         if (his_limit < i_want) {
5854                 /* I Want more :< */
5855                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5856         } else {
5857                 /* I can have what I want :> */
5858                 initack->init.num_outbound_streams = htons(i_want);
5859         }
5860         /* tell him his limit. */
5861         initack->init.num_inbound_streams =
5862             htons(inp->sctp_ep.max_open_streams_intome);
5863
5864         /* adaptation layer indication parameter */
5865         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5866                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5867                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5868                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5869                 ali->ph.param_length = htons(parameter_len);
5870                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5871                 chunk_len += parameter_len;
5872         }
5873         /* ECN parameter */
5874         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5875             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5876                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5877                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5878                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5879                 ph->param_length = htons(parameter_len);
5880                 chunk_len += parameter_len;
5881         }
5882         /* PR-SCTP supported parameter */
5883         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5884             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5885                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5886                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5887                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5888                 ph->param_length = htons(parameter_len);
5889                 chunk_len += parameter_len;
5890         }
5891         /* Add NAT friendly parameter */
5892         if (nat_friendly) {
5893                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5894                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5895                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5896                 ph->param_length = htons(parameter_len);
5897                 chunk_len += parameter_len;
5898         }
5899         /* And now tell the peer which extensions we support */
5900         num_ext = 0;
5901         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5902         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5903             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5904                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5905         }
5906         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5907             ((asoc == NULL) && (inp->auth_supported == 1))) {
5908                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5909         }
5910         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5911             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5912                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5913                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5914         }
5915         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5916             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5917                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5918         }
5919         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5920             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5921                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5922         }
5923         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5924             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5925                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5926         }
5927         if (num_ext > 0) {
5928                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5929                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5930                 pr_supported->ph.param_length = htons(parameter_len);
5931                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5932                 chunk_len += parameter_len;
5933         }
5934         /* add authentication parameters */
5935         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5936             ((asoc == NULL) && (inp->auth_supported == 1))) {
5937                 struct sctp_auth_random *randp;
5938                 struct sctp_auth_hmac_algo *hmacs;
5939                 struct sctp_auth_chunk_list *chunks;
5940
5941                 if (padding_len > 0) {
5942                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5943                         chunk_len += padding_len;
5944                         padding_len = 0;
5945                 }
5946                 /* generate and add RANDOM parameter */
5947                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5948                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5949                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5950                 randp->ph.param_type = htons(SCTP_RANDOM);
5951                 randp->ph.param_length = htons(parameter_len);
5952                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5953                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5954                 chunk_len += parameter_len;
5955
5956                 if (padding_len > 0) {
5957                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5958                         chunk_len += padding_len;
5959                         padding_len = 0;
5960                 }
5961                 /* add HMAC_ALGO parameter */
5962                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5963                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
5964                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5965                     (uint8_t *) hmacs->hmac_ids);
5966                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5967                 hmacs->ph.param_length = htons(parameter_len);
5968                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5969                 chunk_len += parameter_len;
5970
5971                 if (padding_len > 0) {
5972                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5973                         chunk_len += padding_len;
5974                         padding_len = 0;
5975                 }
5976                 /* add CHUNKS parameter */
5977                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
5978                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
5979                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5980                     chunks->chunk_types);
5981                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5982                 chunks->ph.param_length = htons(parameter_len);
5983                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5984                 chunk_len += parameter_len;
5985         }
5986         SCTP_BUF_LEN(m) = chunk_len;
5987         m_last = m;
5988         /* now the addresses */
5989         /*
5990          * To optimize this we could put the scoping stuff into a structure
5991          * and remove the individual uint8's from the stc structure. Then we
5992          * could just sifa in the address within the stc.. but for now this
5993          * is a quick hack to get the address stuff teased apart.
5994          */
5995         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5996         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5997         scp.loopback_scope = stc.loopback_scope;
5998         scp.ipv4_local_scope = stc.ipv4_scope;
5999         scp.local_scope = stc.local_scope;
6000         scp.site_scope = stc.site_scope;
6001         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6002             cnt_inits_to,
6003             &padding_len, &chunk_len);
6004         /* padding_len can only be positive, if no addresses have been added */
6005         if (padding_len > 0) {
6006                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6007                 chunk_len += padding_len;
6008                 SCTP_BUF_LEN(m) += padding_len;
6009                 padding_len = 0;
6010         }
6011         /* tack on the operational error if present */
6012         if (op_err) {
6013                 parameter_len = 0;
6014                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6015                         parameter_len += SCTP_BUF_LEN(m_tmp);
6016                 }
6017                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6018                 SCTP_BUF_NEXT(m_last) = op_err;
6019                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6020                         m_last = SCTP_BUF_NEXT(m_last);
6021                 }
6022                 chunk_len += parameter_len;
6023         }
6024         if (padding_len > 0) {
6025                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6026                 if (m_last == NULL) {
6027                         /* Houston we have a problem, no space */
6028                         sctp_m_freem(m);
6029                         return;
6030                 }
6031                 chunk_len += padding_len;
6032                 padding_len = 0;
6033         }
6034         /* Now we must build a cookie */
6035         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6036         if (m_cookie == NULL) {
6037                 /* memory problem */
6038                 sctp_m_freem(m);
6039                 return;
6040         }
6041         /* Now append the cookie to the end and update the space/size */
6042         SCTP_BUF_NEXT(m_last) = m_cookie;
6043         parameter_len = 0;
6044         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6045                 parameter_len += SCTP_BUF_LEN(m_tmp);
6046                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6047                         m_last = m_tmp;
6048                 }
6049         }
6050         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6051         chunk_len += parameter_len;
6052
6053         /*
6054          * Place in the size, but we don't include the last pad (if any) in
6055          * the INIT-ACK.
6056          */
6057         initack->ch.chunk_length = htons(chunk_len);
6058
6059         /*
6060          * Time to sign the cookie, we don't sign over the cookie signature
6061          * though thus we set trailer.
6062          */
6063         (void)sctp_hmac_m(SCTP_HMAC,
6064             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6065             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6066             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6067         /*
6068          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6069          * here since the timer will drive a retranmission.
6070          */
6071         if (padding_len > 0) {
6072                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6073                         sctp_m_freem(m);
6074                         return;
6075                 }
6076         }
6077         if (stc.loopback_scope) {
6078                 over_addr = (union sctp_sockstore *)dst;
6079         } else {
6080                 over_addr = NULL;
6081         }
6082
6083         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6084             0, 0,
6085             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6086             port, over_addr,
6087             mflowtype, mflowid,
6088             SCTP_SO_NOT_LOCKED);
6089         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6090 }
6091
6092
6093 static void
6094 sctp_prune_prsctp(struct sctp_tcb *stcb,
6095     struct sctp_association *asoc,
6096     struct sctp_sndrcvinfo *srcv,
6097     int dataout)
6098 {
6099         int freed_spc = 0;
6100         struct sctp_tmit_chunk *chk, *nchk;
6101
6102         SCTP_TCB_LOCK_ASSERT(stcb);
6103         if ((asoc->prsctp_supported) &&
6104             (asoc->sent_queue_cnt_removeable > 0)) {
6105                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6106                         /*
6107                          * Look for chunks marked with the PR_SCTP flag AND
6108                          * the buffer space flag. If the one being sent is
6109                          * equal or greater priority then purge the old one
6110                          * and free some space.
6111                          */
6112                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6113                                 /*
6114                                  * This one is PR-SCTP AND buffer space
6115                                  * limited type
6116                                  */
6117                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6118                                         /*
6119                                          * Lower numbers equates to higher
6120                                          * priority so if the one we are
6121                                          * looking at has a larger or equal
6122                                          * priority we want to drop the data
6123                                          * and NOT retransmit it.
6124                                          */
6125                                         if (chk->data) {
6126                                                 /*
6127                                                  * We release the book_size
6128                                                  * if the mbuf is here
6129                                                  */
6130                                                 int ret_spc;
6131                                                 uint8_t sent;
6132
6133                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6134                                                         sent = 1;
6135                                                 else
6136                                                         sent = 0;
6137                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6138                                                     sent,
6139                                                     SCTP_SO_LOCKED);
6140                                                 freed_spc += ret_spc;
6141                                                 if (freed_spc >= dataout) {
6142                                                         return;
6143                                                 }
6144                                         }       /* if chunk was present */
6145                                 }       /* if of sufficent priority */
6146                         }       /* if chunk has enabled */
6147                 }               /* tailqforeach */
6148
6149                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6150                         /* Here we must move to the sent queue and mark */
6151                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6152                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6153                                         if (chk->data) {
6154                                                 /*
6155                                                  * We release the book_size
6156                                                  * if the mbuf is here
6157                                                  */
6158                                                 int ret_spc;
6159
6160                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6161                                                     0, SCTP_SO_LOCKED);
6162
6163                                                 freed_spc += ret_spc;
6164                                                 if (freed_spc >= dataout) {
6165                                                         return;
6166                                                 }
6167                                         }       /* end if chk->data */
6168                                 }       /* end if right class */
6169                         }       /* end if chk pr-sctp */
6170                 }               /* tailqforeachsafe (chk) */
6171         }                       /* if enabled in asoc */
6172 }
6173
6174 int
6175 sctp_get_frag_point(struct sctp_tcb *stcb,
6176     struct sctp_association *asoc)
6177 {
6178         int siz, ovh;
6179
6180         /*
6181          * For endpoints that have both v6 and v4 addresses we must reserve
6182          * room for the ipv6 header, for those that are only dealing with V4
6183          * we use a larger frag point.
6184          */
6185         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6186                 ovh = SCTP_MED_OVERHEAD;
6187         } else {
6188                 ovh = SCTP_MED_V4_OVERHEAD;
6189         }
6190
6191         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6192                 siz = asoc->smallest_mtu - ovh;
6193         else
6194                 siz = (stcb->asoc.sctp_frag_point - ovh);
6195         /*
6196          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6197          */
6198         /* A data chunk MUST fit in a cluster */
6199         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6200         /* } */
6201
6202         /* adjust for an AUTH chunk if DATA requires auth */
6203         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6204                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6205
6206         if (siz % 4) {
6207                 /* make it an even word boundary please */
6208                 siz -= (siz % 4);
6209         }
6210         return (siz);
6211 }
6212
6213 static void
6214 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6215 {
6216         /*
6217          * We assume that the user wants PR_SCTP_TTL if the user provides a
6218          * positive lifetime but does not specify any PR_SCTP policy.
6219          */
6220         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6221                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6222         } else if (sp->timetolive > 0) {
6223                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6224                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6225         } else {
6226                 return;
6227         }
6228         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6229         case CHUNK_FLAGS_PR_SCTP_BUF:
6230                 /*
6231                  * Time to live is a priority stored in tv_sec when doing
6232                  * the buffer drop thing.
6233                  */
6234                 sp->ts.tv_sec = sp->timetolive;
6235                 sp->ts.tv_usec = 0;
6236                 break;
6237         case CHUNK_FLAGS_PR_SCTP_TTL:
6238                 {
6239                         struct timeval tv;
6240
6241                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6242                         tv.tv_sec = sp->timetolive / 1000;
6243                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6244                         /*
6245                          * TODO sctp_constants.h needs alternative time
6246                          * macros when _KERNEL is undefined.
6247                          */
6248                         timevaladd(&sp->ts, &tv);
6249                 }
6250                 break;
6251         case CHUNK_FLAGS_PR_SCTP_RTX:
6252                 /*
6253                  * Time to live is a the number or retransmissions stored in
6254                  * tv_sec.
6255                  */
6256                 sp->ts.tv_sec = sp->timetolive;
6257                 sp->ts.tv_usec = 0;
6258                 break;
6259         default:
6260                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6261                     "Unknown PR_SCTP policy %u.\n",
6262                     PR_SCTP_POLICY(sp->sinfo_flags));
6263                 break;
6264         }
6265 }
6266
6267 static int
6268 sctp_msg_append(struct sctp_tcb *stcb,
6269     struct sctp_nets *net,
6270     struct mbuf *m,
6271     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6272 {
6273         int error = 0;
6274         struct mbuf *at;
6275         struct sctp_stream_queue_pending *sp = NULL;
6276         struct sctp_stream_out *strm;
6277
6278         /*
6279          * Given an mbuf chain, put it into the association send queue and
6280          * place it on the wheel
6281          */
6282         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6283                 /* Invalid stream number */
6284                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6285                 error = EINVAL;
6286                 goto out_now;
6287         }
6288         if ((stcb->asoc.stream_locked) &&
6289             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6290                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6291                 error = EINVAL;
6292                 goto out_now;
6293         }
6294         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6295         /* Now can we send this? */
6296         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6297             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6298             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6299             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6300                 /* got data while shutting down */
6301                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6302                 error = ECONNRESET;
6303                 goto out_now;
6304         }
6305         sctp_alloc_a_strmoq(stcb, sp);
6306         if (sp == NULL) {
6307                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6308                 error = ENOMEM;
6309                 goto out_now;
6310         }
6311         sp->sinfo_flags = srcv->sinfo_flags;
6312         sp->timetolive = srcv->sinfo_timetolive;
6313         sp->ppid = srcv->sinfo_ppid;
6314         sp->context = srcv->sinfo_context;
6315         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6316                 sp->net = net;
6317                 atomic_add_int(&sp->net->ref_count, 1);
6318         } else {
6319                 sp->net = NULL;
6320         }
6321         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6322         sp->stream = srcv->sinfo_stream;
6323         sp->msg_is_complete = 1;
6324         sp->sender_all_done = 1;
6325         sp->some_taken = 0;
6326         sp->data = m;
6327         sp->tail_mbuf = NULL;
6328         sctp_set_prsctp_policy(sp);
6329         /*
6330          * We could in theory (for sendall) sifa the length in, but we would
6331          * still have to hunt through the chain since we need to setup the
6332          * tail_mbuf
6333          */
6334         sp->length = 0;
6335         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6336                 if (SCTP_BUF_NEXT(at) == NULL)
6337                         sp->tail_mbuf = at;
6338                 sp->length += SCTP_BUF_LEN(at);
6339         }
6340         if (srcv->sinfo_keynumber_valid) {
6341                 sp->auth_keyid = srcv->sinfo_keynumber;
6342         } else {
6343                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6344         }
6345         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6346                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6347                 sp->holds_key_ref = 1;
6348         }
6349         if (hold_stcb_lock == 0) {
6350                 SCTP_TCB_SEND_LOCK(stcb);
6351         }
6352         sctp_snd_sb_alloc(stcb, sp->length);
6353         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6354         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6355         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6356         m = NULL;
6357         if (hold_stcb_lock == 0) {
6358                 SCTP_TCB_SEND_UNLOCK(stcb);
6359         }
6360 out_now:
6361         if (m) {
6362                 sctp_m_freem(m);
6363         }
6364         return (error);
6365 }
6366
6367
6368 static struct mbuf *
6369 sctp_copy_mbufchain(struct mbuf *clonechain,
6370     struct mbuf *outchain,
6371     struct mbuf **endofchain,
6372     int can_take_mbuf,
6373     int sizeofcpy,
6374     uint8_t copy_by_ref)
6375 {
6376         struct mbuf *m;
6377         struct mbuf *appendchain;
6378         caddr_t cp;
6379         int len;
6380
6381         if (endofchain == NULL) {
6382                 /* error */
6383 error_out:
6384                 if (outchain)
6385                         sctp_m_freem(outchain);
6386                 return (NULL);
6387         }
6388         if (can_take_mbuf) {
6389                 appendchain = clonechain;
6390         } else {
6391                 if (!copy_by_ref &&
6392                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6393                     ) {
6394                         /* Its not in a cluster */
6395                         if (*endofchain == NULL) {
6396                                 /* lets get a mbuf cluster */
6397                                 if (outchain == NULL) {
6398                                         /* This is the general case */
6399                         new_mbuf:
6400                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6401                                         if (outchain == NULL) {
6402                                                 goto error_out;
6403                                         }
6404                                         SCTP_BUF_LEN(outchain) = 0;
6405                                         *endofchain = outchain;
6406                                         /* get the prepend space */
6407                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6408                                 } else {
6409                                         /*
6410                                          * We really should not get a NULL
6411                                          * in endofchain
6412                                          */
6413                                         /* find end */
6414                                         m = outchain;
6415                                         while (m) {
6416                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6417                                                         *endofchain = m;
6418                                                         break;
6419                                                 }
6420                                                 m = SCTP_BUF_NEXT(m);
6421                                         }
6422                                         /* sanity */
6423                                         if (*endofchain == NULL) {
6424                                                 /*
6425                                                  * huh, TSNH XXX maybe we
6426                                                  * should panic
6427                                                  */
6428                                                 sctp_m_freem(outchain);
6429                                                 goto new_mbuf;
6430                                         }
6431                                 }
6432                                 /* get the new end of length */
6433                                 len = M_TRAILINGSPACE(*endofchain);
6434                         } else {
6435                                 /* how much is left at the end? */
6436                                 len = M_TRAILINGSPACE(*endofchain);
6437                         }
6438                         /* Find the end of the data, for appending */
6439                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6440
6441                         /* Now lets copy it out */
6442                         if (len >= sizeofcpy) {
6443                                 /* It all fits, copy it in */
6444                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6445                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6446                         } else {
6447                                 /* fill up the end of the chain */
6448                                 if (len > 0) {
6449                                         m_copydata(clonechain, 0, len, cp);
6450                                         SCTP_BUF_LEN((*endofchain)) += len;
6451                                         /* now we need another one */
6452                                         sizeofcpy -= len;
6453                                 }
6454                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6455                                 if (m == NULL) {
6456                                         /* We failed */
6457                                         goto error_out;
6458                                 }
6459                                 SCTP_BUF_NEXT((*endofchain)) = m;
6460                                 *endofchain = m;
6461                                 cp = mtod((*endofchain), caddr_t);
6462                                 m_copydata(clonechain, len, sizeofcpy, cp);
6463                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6464                         }
6465                         return (outchain);
6466                 } else {
6467                         /* copy the old fashion way */
6468                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6469 #ifdef SCTP_MBUF_LOGGING
6470                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6471                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6472                         }
6473 #endif
6474                 }
6475         }
6476         if (appendchain == NULL) {
6477                 /* error */
6478                 if (outchain)
6479                         sctp_m_freem(outchain);
6480                 return (NULL);
6481         }
6482         if (outchain) {
6483                 /* tack on to the end */
6484                 if (*endofchain != NULL) {
6485                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6486                 } else {
6487                         m = outchain;
6488                         while (m) {
6489                                 if (SCTP_BUF_NEXT(m) == NULL) {
6490                                         SCTP_BUF_NEXT(m) = appendchain;
6491                                         break;
6492                                 }
6493                                 m = SCTP_BUF_NEXT(m);
6494                         }
6495                 }
6496                 /*
6497                  * save off the end and update the end-chain postion
6498                  */
6499                 m = appendchain;
6500                 while (m) {
6501                         if (SCTP_BUF_NEXT(m) == NULL) {
6502                                 *endofchain = m;
6503                                 break;
6504                         }
6505                         m = SCTP_BUF_NEXT(m);
6506                 }
6507                 return (outchain);
6508         } else {
6509                 /* save off the end and update the end-chain postion */
6510                 m = appendchain;
6511                 while (m) {
6512                         if (SCTP_BUF_NEXT(m) == NULL) {
6513                                 *endofchain = m;
6514                                 break;
6515                         }
6516                         m = SCTP_BUF_NEXT(m);
6517                 }
6518                 return (appendchain);
6519         }
6520 }
6521
6522 static int
6523 sctp_med_chunk_output(struct sctp_inpcb *inp,
6524     struct sctp_tcb *stcb,
6525     struct sctp_association *asoc,
6526     int *num_out,
6527     int *reason_code,
6528     int control_only, int from_where,
6529     struct timeval *now, int *now_filled, int frag_point, int so_locked
6530 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6531     SCTP_UNUSED
6532 #endif
6533 );
6534
6535 static void
6536 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6537     uint32_t val SCTP_UNUSED)
6538 {
6539         struct sctp_copy_all *ca;
6540         struct mbuf *m;
6541         int ret = 0;
6542         int added_control = 0;
6543         int un_sent, do_chunk_output = 1;
6544         struct sctp_association *asoc;
6545         struct sctp_nets *net;
6546
6547         ca = (struct sctp_copy_all *)ptr;
6548         if (ca->m == NULL) {
6549                 return;
6550         }
6551         if (ca->inp != inp) {
6552                 /* TSNH */
6553                 return;
6554         }
6555         if (ca->sndlen > 0) {
6556                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6557                 if (m == NULL) {
6558                         /* can't copy so we are done */
6559                         ca->cnt_failed++;
6560                         return;
6561                 }
6562 #ifdef SCTP_MBUF_LOGGING
6563                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6564                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6565                 }
6566 #endif
6567         } else {
6568                 m = NULL;
6569         }
6570         SCTP_TCB_LOCK_ASSERT(stcb);
6571         if (stcb->asoc.alternate) {
6572                 net = stcb->asoc.alternate;
6573         } else {
6574                 net = stcb->asoc.primary_destination;
6575         }
6576         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6577                 /* Abort this assoc with m as the user defined reason */
6578                 if (m != NULL) {
6579                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6580                 } else {
6581                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6582                             0, M_NOWAIT, 1, MT_DATA);
6583                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6584                 }
6585                 if (m != NULL) {
6586                         struct sctp_paramhdr *ph;
6587
6588                         ph = mtod(m, struct sctp_paramhdr *);
6589                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6590                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6591                 }
6592                 /*
6593                  * We add one here to keep the assoc from dis-appearing on
6594                  * us.
6595                  */
6596                 atomic_add_int(&stcb->asoc.refcnt, 1);
6597                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6598                 /*
6599                  * sctp_abort_an_association calls sctp_free_asoc() free
6600                  * association will NOT free it since we incremented the
6601                  * refcnt .. we do this to prevent it being freed and things
6602                  * getting tricky since we could end up (from free_asoc)
6603                  * calling inpcb_free which would get a recursive lock call
6604                  * to the iterator lock.. But as a consequence of that the
6605                  * stcb will return to us un-locked.. since free_asoc
6606                  * returns with either no TCB or the TCB unlocked, we must
6607                  * relock.. to unlock in the iterator timer :-0
6608                  */
6609                 SCTP_TCB_LOCK(stcb);
6610                 atomic_add_int(&stcb->asoc.refcnt, -1);
6611                 goto no_chunk_output;
6612         } else {
6613                 if (m) {
6614                         ret = sctp_msg_append(stcb, net, m,
6615                             &ca->sndrcv, 1);
6616                 }
6617                 asoc = &stcb->asoc;
6618                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6619                         /* shutdown this assoc */
6620                         int cnt;
6621
6622                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6623
6624                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6625                             TAILQ_EMPTY(&asoc->sent_queue) &&
6626                             (cnt == 0)) {
6627                                 if (asoc->locked_on_sending) {
6628                                         goto abort_anyway;
6629                                 }
6630                                 /*
6631                                  * there is nothing queued to send, so I'm
6632                                  * done...
6633                                  */
6634                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6635                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6636                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6637                                         /*
6638                                          * only send SHUTDOWN the first time
6639                                          * through
6640                                          */
6641                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6642                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6643                                         }
6644                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6645                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6646                                         sctp_stop_timers_for_shutdown(stcb);
6647                                         sctp_send_shutdown(stcb, net);
6648                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6649                                             net);
6650                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6651                                             asoc->primary_destination);
6652                                         added_control = 1;
6653                                         do_chunk_output = 0;
6654                                 }
6655                         } else {
6656                                 /*
6657                                  * we still got (or just got) data to send,
6658                                  * so set SHUTDOWN_PENDING
6659                                  */
6660                                 /*
6661                                  * XXX sockets draft says that SCTP_EOF
6662                                  * should be sent with no data.  currently,
6663                                  * we will allow user data to be sent first
6664                                  * and move to SHUTDOWN-PENDING
6665                                  */
6666                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6667                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6668                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6669                                         if (asoc->locked_on_sending) {
6670                                                 /*
6671                                                  * Locked to send out the
6672                                                  * data
6673                                                  */
6674                                                 struct sctp_stream_queue_pending *sp;
6675
6676                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6677                                                 if (sp) {
6678                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6679                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6680                                                 }
6681                                         }
6682                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6683                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6684                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6685                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6686                                                 struct mbuf *op_err;
6687                                                 char msg[SCTP_DIAG_INFO_LEN];
6688
6689                                 abort_anyway:
6690                                                 snprintf(msg, sizeof(msg),
6691                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6692                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6693                                                     msg);
6694                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6695                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6696                                                     op_err, SCTP_SO_NOT_LOCKED);
6697                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6698                                                 goto no_chunk_output;
6699                                         }
6700                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6701                                             asoc->primary_destination);
6702                                 }
6703                         }
6704
6705                 }
6706         }
6707         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6708             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6709
6710         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6711             (stcb->asoc.total_flight > 0) &&
6712             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6713                 do_chunk_output = 0;
6714         }
6715         if (do_chunk_output)
6716                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6717         else if (added_control) {
6718                 int num_out, reason, now_filled = 0;
6719                 struct timeval now;
6720                 int frag_point;
6721
6722                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6723                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6724                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6725         }
6726 no_chunk_output:
6727         if (ret) {
6728                 ca->cnt_failed++;
6729         } else {
6730                 ca->cnt_sent++;
6731         }
6732 }
6733
6734 static void
6735 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6736 {
6737         struct sctp_copy_all *ca;
6738
6739         ca = (struct sctp_copy_all *)ptr;
6740         /*
6741          * Do a notify here? Kacheong suggests that the notify be done at
6742          * the send time.. so you would push up a notification if any send
6743          * failed. Don't know if this is feasable since the only failures we
6744          * have is "memory" related and if you cannot get an mbuf to send
6745          * the data you surely can't get an mbuf to send up to notify the
6746          * user you can't send the data :->
6747          */
6748
6749         /* now free everything */
6750         sctp_m_freem(ca->m);
6751         SCTP_FREE(ca, SCTP_M_COPYAL);
6752 }
6753
6754 static struct mbuf *
6755 sctp_copy_out_all(struct uio *uio, int len)
6756 {
6757         struct mbuf *ret, *at;
6758         int left, willcpy, cancpy, error;
6759
6760         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6761         if (ret == NULL) {
6762                 /* TSNH */
6763                 return (NULL);
6764         }
6765         left = len;
6766         SCTP_BUF_LEN(ret) = 0;
6767         /* save space for the data chunk header */
6768         cancpy = M_TRAILINGSPACE(ret);
6769         willcpy = min(cancpy, left);
6770         at = ret;
6771         while (left > 0) {
6772                 /* Align data to the end */
6773                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6774                 if (error) {
6775         err_out_now:
6776                         sctp_m_freem(at);
6777                         return (NULL);
6778                 }
6779                 SCTP_BUF_LEN(at) = willcpy;
6780                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6781                 left -= willcpy;
6782                 if (left > 0) {
6783                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6784                         if (SCTP_BUF_NEXT(at) == NULL) {
6785                                 goto err_out_now;
6786                         }
6787                         at = SCTP_BUF_NEXT(at);
6788                         SCTP_BUF_LEN(at) = 0;
6789                         cancpy = M_TRAILINGSPACE(at);
6790                         willcpy = min(cancpy, left);
6791                 }
6792         }
6793         return (ret);
6794 }
6795
6796 static int
6797 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6798     struct sctp_sndrcvinfo *srcv)
6799 {
6800         int ret;
6801         struct sctp_copy_all *ca;
6802
6803         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6804             SCTP_M_COPYAL);
6805         if (ca == NULL) {
6806                 sctp_m_freem(m);
6807                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6808                 return (ENOMEM);
6809         }
6810         memset(ca, 0, sizeof(struct sctp_copy_all));
6811
6812         ca->inp = inp;
6813         if (srcv) {
6814                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6815         }
6816         /*
6817          * take off the sendall flag, it would be bad if we failed to do
6818          * this :-0
6819          */
6820         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6821         /* get length and mbuf chain */
6822         if (uio) {
6823                 ca->sndlen = uio->uio_resid;
6824                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6825                 if (ca->m == NULL) {
6826                         SCTP_FREE(ca, SCTP_M_COPYAL);
6827                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6828                         return (ENOMEM);
6829                 }
6830         } else {
6831                 /* Gather the length of the send */
6832                 struct mbuf *mat;
6833
6834                 ca->sndlen = 0;
6835                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6836                         ca->sndlen += SCTP_BUF_LEN(mat);
6837                 }
6838         }
6839         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6840             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6841             SCTP_ASOC_ANY_STATE,
6842             (void *)ca, 0,
6843             sctp_sendall_completes, inp, 1);
6844         if (ret) {
6845                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6846                 SCTP_FREE(ca, SCTP_M_COPYAL);
6847                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6848                 return (EFAULT);
6849         }
6850         return (0);
6851 }
6852
6853
6854 void
6855 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6856 {
6857         struct sctp_tmit_chunk *chk, *nchk;
6858
6859         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6860                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6861                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6862                         if (chk->data) {
6863                                 sctp_m_freem(chk->data);
6864                                 chk->data = NULL;
6865                         }
6866                         asoc->ctrl_queue_cnt--;
6867                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6868                 }
6869         }
6870 }
6871
6872 void
6873 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6874 {
6875         struct sctp_association *asoc;
6876         struct sctp_tmit_chunk *chk, *nchk;
6877         struct sctp_asconf_chunk *acp;
6878
6879         asoc = &stcb->asoc;
6880         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6881                 /* find SCTP_ASCONF chunk in queue */
6882                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6883                         if (chk->data) {
6884                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6885                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6886                                         /* Not Acked yet */
6887                                         break;
6888                                 }
6889                         }
6890                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6891                         if (chk->data) {
6892                                 sctp_m_freem(chk->data);
6893                                 chk->data = NULL;
6894                         }
6895                         asoc->ctrl_queue_cnt--;
6896                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6897                 }
6898         }
6899 }
6900
6901
6902 static void
6903 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6904     struct sctp_association *asoc,
6905     struct sctp_tmit_chunk **data_list,
6906     int bundle_at,
6907     struct sctp_nets *net)
6908 {
6909         int i;
6910         struct sctp_tmit_chunk *tp1;
6911
6912         for (i = 0; i < bundle_at; i++) {
6913                 /* off of the send queue */
6914                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6915                 asoc->send_queue_cnt--;
6916                 if (i > 0) {
6917                         /*
6918                          * Any chunk NOT 0 you zap the time chunk 0 gets
6919                          * zapped or set based on if a RTO measurment is
6920                          * needed.
6921                          */
6922                         data_list[i]->do_rtt = 0;
6923                 }
6924                 /* record time */
6925                 data_list[i]->sent_rcv_time = net->last_sent_time;
6926                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6927                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6928                 if (data_list[i]->whoTo == NULL) {
6929                         data_list[i]->whoTo = net;
6930                         atomic_add_int(&net->ref_count, 1);
6931                 }
6932                 /* on to the sent queue */
6933                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6934                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6935                         struct sctp_tmit_chunk *tpp;
6936
6937                         /* need to move back */
6938         back_up_more:
6939                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6940                         if (tpp == NULL) {
6941                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6942                                 goto all_done;
6943                         }
6944                         tp1 = tpp;
6945                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6946                                 goto back_up_more;
6947                         }
6948                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6949                 } else {
6950                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6951                             data_list[i],
6952                             sctp_next);
6953                 }
6954 all_done:
6955                 /* This does not lower until the cum-ack passes it */
6956                 asoc->sent_queue_cnt++;
6957                 if ((asoc->peers_rwnd <= 0) &&
6958                     (asoc->total_flight == 0) &&
6959                     (bundle_at == 1)) {
6960                         /* Mark the chunk as being a window probe */
6961                         SCTP_STAT_INCR(sctps_windowprobed);
6962                 }
6963 #ifdef SCTP_AUDITING_ENABLED
6964                 sctp_audit_log(0xC2, 3);
6965 #endif
6966                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6967                 data_list[i]->snd_count = 1;
6968                 data_list[i]->rec.data.chunk_was_revoked = 0;
6969                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6970                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6971                             data_list[i]->whoTo->flight_size,
6972                             data_list[i]->book_size,
6973                             (uintptr_t) data_list[i]->whoTo,
6974                             data_list[i]->rec.data.TSN_seq);
6975                 }
6976                 sctp_flight_size_increase(data_list[i]);
6977                 sctp_total_flight_increase(stcb, data_list[i]);
6978                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6979                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6980                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6981                 }
6982                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6983                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6984                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6985                         /* SWS sender side engages */
6986                         asoc->peers_rwnd = 0;
6987                 }
6988         }
6989         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6990                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6991         }
6992 }
6993
6994 static void
6995 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6996 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6997     SCTP_UNUSED
6998 #endif
6999 )
7000 {
7001         struct sctp_tmit_chunk *chk, *nchk;
7002
7003         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7004                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7005                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7006                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7007                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7008                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7009                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7010                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7011                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7012                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7013                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7014                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7015                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7016                         /* Stray chunks must be cleaned up */
7017         clean_up_anyway:
7018                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7019                         if (chk->data) {
7020                                 sctp_m_freem(chk->data);
7021                                 chk->data = NULL;
7022                         }
7023                         asoc->ctrl_queue_cnt--;
7024                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7025                                 asoc->fwd_tsn_cnt--;
7026                         sctp_free_a_chunk(stcb, chk, so_locked);
7027                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7028                         /* special handling, we must look into the param */
7029                         if (chk != asoc->str_reset) {
7030                                 goto clean_up_anyway;
7031                         }
7032                 }
7033         }
7034 }
7035
7036
7037 static int
7038 sctp_can_we_split_this(struct sctp_tcb *stcb,
7039     uint32_t length,
7040     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7041 {
7042         /*
7043          * Make a decision on if I should split a msg into multiple parts.
7044          * This is only asked of incomplete messages.
7045          */
7046         if (eeor_on) {
7047                 /*
7048                  * If we are doing EEOR we need to always send it if its the
7049                  * entire thing, since it might be all the guy is putting in
7050                  * the hopper.
7051                  */
7052                 if (goal_mtu >= length) {
7053                         /*-
7054                          * If we have data outstanding,
7055                          * we get another chance when the sack
7056                          * arrives to transmit - wait for more data
7057                          */
7058                         if (stcb->asoc.total_flight == 0) {
7059                                 /*
7060                                  * If nothing is in flight, we zero the
7061                                  * packet counter.
7062                                  */
7063                                 return (length);
7064                         }
7065                         return (0);
7066
7067                 } else {
7068                         /* You can fill the rest */
7069                         return (goal_mtu);
7070                 }
7071         }
7072         /*-
7073          * For those strange folk that make the send buffer
7074          * smaller than our fragmentation point, we can't
7075          * get a full msg in so we have to allow splitting.
7076          */
7077         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7078                 return (length);
7079         }
7080         if ((length <= goal_mtu) ||
7081             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7082                 /* Sub-optimial residual don't split in non-eeor mode. */
7083                 return (0);
7084         }
7085         /*
7086          * If we reach here length is larger than the goal_mtu. Do we wish
7087          * to split it for the sake of packet putting together?
7088          */
7089         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7090                 /* Its ok to split it */
7091                 return (min(goal_mtu, frag_point));
7092         }
7093         /* Nope, can't split */
7094         return (0);
7095
7096 }
7097
7098 static uint32_t
7099 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7100     struct sctp_stream_out *strq,
7101     uint32_t goal_mtu,
7102     uint32_t frag_point,
7103     int *locked,
7104     int *giveup,
7105     int eeor_mode,
7106     int *bail,
7107     int so_locked
7108 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7109     SCTP_UNUSED
7110 #endif
7111 )
7112 {
7113         /* Move from the stream to the send_queue keeping track of the total */
7114         struct sctp_association *asoc;
7115         struct sctp_stream_queue_pending *sp;
7116         struct sctp_tmit_chunk *chk;
7117         struct sctp_data_chunk *dchkh;
7118         uint32_t to_move, length;
7119         uint8_t rcv_flags = 0;
7120         uint8_t some_taken;
7121         uint8_t send_lock_up = 0;
7122
7123         SCTP_TCB_LOCK_ASSERT(stcb);
7124         asoc = &stcb->asoc;
7125 one_more_time:
7126         /* sa_ignore FREED_MEMORY */
7127         sp = TAILQ_FIRST(&strq->outqueue);
7128         if (sp == NULL) {
7129                 *locked = 0;
7130                 if (send_lock_up == 0) {
7131                         SCTP_TCB_SEND_LOCK(stcb);
7132                         send_lock_up = 1;
7133                 }
7134                 sp = TAILQ_FIRST(&strq->outqueue);
7135                 if (sp) {
7136                         goto one_more_time;
7137                 }
7138                 if (strq->last_msg_incomplete) {
7139                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7140                             strq->stream_no,
7141                             strq->last_msg_incomplete);
7142                         strq->last_msg_incomplete = 0;
7143                 }
7144                 to_move = 0;
7145                 if (send_lock_up) {
7146                         SCTP_TCB_SEND_UNLOCK(stcb);
7147                         send_lock_up = 0;
7148                 }
7149                 goto out_of;
7150         }
7151         if ((sp->msg_is_complete) && (sp->length == 0)) {
7152                 if (sp->sender_all_done) {
7153                         /*
7154                          * We are doing differed cleanup. Last time through
7155                          * when we took all the data the sender_all_done was
7156                          * not set.
7157                          */
7158                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7159                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7160                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7161                                     sp->sender_all_done,
7162                                     sp->length,
7163                                     sp->msg_is_complete,
7164                                     sp->put_last_out,
7165                                     send_lock_up);
7166                         }
7167                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7168                                 SCTP_TCB_SEND_LOCK(stcb);
7169                                 send_lock_up = 1;
7170                         }
7171                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7172                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7173                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7174                             (strq->chunks_on_queues == 0) &&
7175                             TAILQ_EMPTY(&strq->outqueue)) {
7176                                 stcb->asoc.trigger_reset = 1;
7177                         }
7178                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7179                         if (sp->net) {
7180                                 sctp_free_remote_addr(sp->net);
7181                                 sp->net = NULL;
7182                         }
7183                         if (sp->data) {
7184                                 sctp_m_freem(sp->data);
7185                                 sp->data = NULL;
7186                         }
7187                         sctp_free_a_strmoq(stcb, sp, so_locked);
7188                         /* we can't be locked to it */
7189                         *locked = 0;
7190                         stcb->asoc.locked_on_sending = NULL;
7191                         if (send_lock_up) {
7192                                 SCTP_TCB_SEND_UNLOCK(stcb);
7193                                 send_lock_up = 0;
7194                         }
7195                         /* back to get the next msg */
7196                         goto one_more_time;
7197                 } else {
7198                         /*
7199                          * sender just finished this but still holds a
7200                          * reference
7201                          */
7202                         *locked = 1;
7203                         *giveup = 1;
7204                         to_move = 0;
7205                         goto out_of;
7206                 }
7207         } else {
7208                 /* is there some to get */
7209                 if (sp->length == 0) {
7210                         /* no */
7211                         *locked = 1;
7212                         *giveup = 1;
7213                         to_move = 0;
7214                         goto out_of;
7215                 } else if (sp->discard_rest) {
7216                         if (send_lock_up == 0) {
7217                                 SCTP_TCB_SEND_LOCK(stcb);
7218                                 send_lock_up = 1;
7219                         }
7220                         /* Whack down the size */
7221                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7222                         if ((stcb->sctp_socket != NULL) &&
7223                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7224                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7225                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7226                         }
7227                         if (sp->data) {
7228                                 sctp_m_freem(sp->data);
7229                                 sp->data = NULL;
7230                                 sp->tail_mbuf = NULL;
7231                         }
7232                         sp->length = 0;
7233                         sp->some_taken = 1;
7234                         *locked = 1;
7235                         *giveup = 1;
7236                         to_move = 0;
7237                         goto out_of;
7238                 }
7239         }
7240         some_taken = sp->some_taken;
7241 re_look:
7242         length = sp->length;
7243         if (sp->msg_is_complete) {
7244                 /* The message is complete */
7245                 to_move = min(length, frag_point);
7246                 if (to_move == length) {
7247                         /* All of it fits in the MTU */
7248                         if (sp->some_taken) {
7249                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7250                                 sp->put_last_out = 1;
7251                         } else {
7252                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7253                                 sp->put_last_out = 1;
7254                         }
7255                 } else {
7256                         /* Not all of it fits, we fragment */
7257                         if (sp->some_taken == 0) {
7258                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7259                         }
7260                         sp->some_taken = 1;
7261                 }
7262         } else {
7263                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7264                 if (to_move) {
7265                         /*-
7266                          * We use a snapshot of length in case it
7267                          * is expanding during the compare.
7268                          */
7269                         uint32_t llen;
7270
7271                         llen = length;
7272                         if (to_move >= llen) {
7273                                 to_move = llen;
7274                                 if (send_lock_up == 0) {
7275                                         /*-
7276                                          * We are taking all of an incomplete msg
7277                                          * thus we need a send lock.
7278                                          */
7279                                         SCTP_TCB_SEND_LOCK(stcb);
7280                                         send_lock_up = 1;
7281                                         if (sp->msg_is_complete) {
7282                                                 /*
7283                                                  * the sender finished the
7284                                                  * msg
7285                                                  */
7286                                                 goto re_look;
7287                                         }
7288                                 }
7289                         }
7290                         if (sp->some_taken == 0) {
7291                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7292                                 sp->some_taken = 1;
7293                         }
7294                 } else {
7295                         /* Nothing to take. */
7296                         if (sp->some_taken) {
7297                                 *locked = 1;
7298                         }
7299                         *giveup = 1;
7300                         to_move = 0;
7301                         goto out_of;
7302                 }
7303         }
7304
7305         /* If we reach here, we can copy out a chunk */
7306         sctp_alloc_a_chunk(stcb, chk);
7307         if (chk == NULL) {
7308                 /* No chunk memory */
7309                 *giveup = 1;
7310                 to_move = 0;
7311                 goto out_of;
7312         }
7313         /*
7314          * Setup for unordered if needed by looking at the user sent info
7315          * flags.
7316          */
7317         if (sp->sinfo_flags & SCTP_UNORDERED) {
7318                 rcv_flags |= SCTP_DATA_UNORDERED;
7319         }
7320         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7321             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7322                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7323         }
7324         /* clear out the chunk before setting up */
7325         memset(chk, 0, sizeof(*chk));
7326         chk->rec.data.rcv_flags = rcv_flags;
7327
7328         if (to_move >= length) {
7329                 /* we think we can steal the whole thing */
7330                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7331                         SCTP_TCB_SEND_LOCK(stcb);
7332                         send_lock_up = 1;
7333                 }
7334                 if (to_move < sp->length) {
7335                         /* bail, it changed */
7336                         goto dont_do_it;
7337                 }
7338                 chk->data = sp->data;
7339                 chk->last_mbuf = sp->tail_mbuf;
7340                 /* register the stealing */
7341                 sp->data = sp->tail_mbuf = NULL;
7342         } else {
7343                 struct mbuf *m;
7344
7345 dont_do_it:
7346                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7347                 chk->last_mbuf = NULL;
7348                 if (chk->data == NULL) {
7349                         sp->some_taken = some_taken;
7350                         sctp_free_a_chunk(stcb, chk, so_locked);
7351                         *bail = 1;
7352                         to_move = 0;
7353                         goto out_of;
7354                 }
7355 #ifdef SCTP_MBUF_LOGGING
7356                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7357                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7358                 }
7359 #endif
7360                 /* Pull off the data */
7361                 m_adj(sp->data, to_move);
7362                 /* Now lets work our way down and compact it */
7363                 m = sp->data;
7364                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7365                         sp->data = SCTP_BUF_NEXT(m);
7366                         SCTP_BUF_NEXT(m) = NULL;
7367                         if (sp->tail_mbuf == m) {
7368                                 /*-
7369                                  * Freeing tail? TSNH since
7370                                  * we supposedly were taking less
7371                                  * than the sp->length.
7372                                  */
7373 #ifdef INVARIANTS
7374                                 panic("Huh, freing tail? - TSNH");
7375 #else
7376                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7377                                 sp->tail_mbuf = sp->data = NULL;
7378                                 sp->length = 0;
7379 #endif
7380
7381                         }
7382                         sctp_m_free(m);
7383                         m = sp->data;
7384                 }
7385         }
7386         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7387                 chk->copy_by_ref = 1;
7388         } else {
7389                 chk->copy_by_ref = 0;
7390         }
7391         /*
7392          * get last_mbuf and counts of mb useage This is ugly but hopefully
7393          * its only one mbuf.
7394          */
7395         if (chk->last_mbuf == NULL) {
7396                 chk->last_mbuf = chk->data;
7397                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7398                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7399                 }
7400         }
7401         if (to_move > length) {
7402                 /*- This should not happen either
7403                  * since we always lower to_move to the size
7404                  * of sp->length if its larger.
7405                  */
7406 #ifdef INVARIANTS
7407                 panic("Huh, how can to_move be larger?");
7408 #else
7409                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7410                 sp->length = 0;
7411 #endif
7412         } else {
7413                 atomic_subtract_int(&sp->length, to_move);
7414         }
7415         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7416                 /* Not enough room for a chunk header, get some */
7417                 struct mbuf *m;
7418
7419                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7420                 if (m == NULL) {
7421                         /*
7422                          * we're in trouble here. _PREPEND below will free
7423                          * all the data if there is no leading space, so we
7424                          * must put the data back and restore.
7425                          */
7426                         if (send_lock_up == 0) {
7427                                 SCTP_TCB_SEND_LOCK(stcb);
7428                                 send_lock_up = 1;
7429                         }
7430                         if (sp->data == NULL) {
7431                                 /* unsteal the data */
7432                                 sp->data = chk->data;
7433                                 sp->tail_mbuf = chk->last_mbuf;
7434                         } else {
7435                                 struct mbuf *m_tmp;
7436
7437                                 /* reassemble the data */
7438                                 m_tmp = sp->data;
7439                                 sp->data = chk->data;
7440                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7441                         }
7442                         sp->some_taken = some_taken;
7443                         atomic_add_int(&sp->length, to_move);
7444                         chk->data = NULL;
7445                         *bail = 1;
7446                         sctp_free_a_chunk(stcb, chk, so_locked);
7447                         to_move = 0;
7448                         goto out_of;
7449                 } else {
7450                         SCTP_BUF_LEN(m) = 0;
7451                         SCTP_BUF_NEXT(m) = chk->data;
7452                         chk->data = m;
7453                         M_ALIGN(chk->data, 4);
7454                 }
7455         }
7456         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7457         if (chk->data == NULL) {
7458                 /* HELP, TSNH since we assured it would not above? */
7459 #ifdef INVARIANTS
7460                 panic("prepend failes HELP?");
7461 #else
7462                 SCTP_PRINTF("prepend fails HELP?\n");
7463                 sctp_free_a_chunk(stcb, chk, so_locked);
7464 #endif
7465                 *bail = 1;
7466                 to_move = 0;
7467                 goto out_of;
7468         }
7469         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7470         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7471         chk->book_size_scale = 0;
7472         chk->sent = SCTP_DATAGRAM_UNSENT;
7473
7474         chk->flags = 0;
7475         chk->asoc = &stcb->asoc;
7476         chk->pad_inplace = 0;
7477         chk->no_fr_allowed = 0;
7478         chk->rec.data.stream_seq = strq->next_sequence_send;
7479         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7480             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7481                 strq->next_sequence_send++;
7482         }
7483         chk->rec.data.stream_number = sp->stream;
7484         chk->rec.data.payloadtype = sp->ppid;
7485         chk->rec.data.context = sp->context;
7486         chk->rec.data.doing_fast_retransmit = 0;
7487
7488         chk->rec.data.timetodrop = sp->ts;
7489         chk->flags = sp->act_flags;
7490
7491         if (sp->net) {
7492                 chk->whoTo = sp->net;
7493                 atomic_add_int(&chk->whoTo->ref_count, 1);
7494         } else
7495                 chk->whoTo = NULL;
7496
7497         if (sp->holds_key_ref) {
7498                 chk->auth_keyid = sp->auth_keyid;
7499                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7500                 chk->holds_key_ref = 1;
7501         }
7502         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7503         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7504                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7505                     (uintptr_t) stcb, sp->length,
7506                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7507                     chk->rec.data.TSN_seq);
7508         }
7509         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7510         /*
7511          * Put the rest of the things in place now. Size was done earlier in
7512          * previous loop prior to padding.
7513          */
7514
7515 #ifdef SCTP_ASOCLOG_OF_TSNS
7516         SCTP_TCB_LOCK_ASSERT(stcb);
7517         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7518                 asoc->tsn_out_at = 0;
7519                 asoc->tsn_out_wrapped = 1;
7520         }
7521         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7522         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7523         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7524         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7525         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7526         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7527         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7528         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7529         asoc->tsn_out_at++;
7530 #endif
7531
7532         dchkh->ch.chunk_type = SCTP_DATA;
7533         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7534         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7535         dchkh->dp.stream_id = htons(strq->stream_no);
7536         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7537         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7538         dchkh->ch.chunk_length = htons(chk->send_size);
7539         /* Now advance the chk->send_size by the actual pad needed. */
7540         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7541                 /* need a pad */
7542                 struct mbuf *lm;
7543                 int pads;
7544
7545                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7546                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7547                 if (lm != NULL) {
7548                         chk->last_mbuf = lm;
7549                         chk->pad_inplace = 1;
7550                 }
7551                 chk->send_size += pads;
7552         }
7553         if (PR_SCTP_ENABLED(chk->flags)) {
7554                 asoc->pr_sctp_cnt++;
7555         }
7556         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7557                 /* All done pull and kill the message */
7558                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7559                 if (sp->put_last_out == 0) {
7560                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7561                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7562                             sp->sender_all_done,
7563                             sp->length,
7564                             sp->msg_is_complete,
7565                             sp->put_last_out,
7566                             send_lock_up);
7567                 }
7568                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7569                         SCTP_TCB_SEND_LOCK(stcb);
7570                         send_lock_up = 1;
7571                 }
7572                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7573                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7574                     (strq->chunks_on_queues == 0) &&
7575                     TAILQ_EMPTY(&strq->outqueue)) {
7576                         stcb->asoc.trigger_reset = 1;
7577                 }
7578                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7579                 if (sp->net) {
7580                         sctp_free_remote_addr(sp->net);
7581                         sp->net = NULL;
7582                 }
7583                 if (sp->data) {
7584                         sctp_m_freem(sp->data);
7585                         sp->data = NULL;
7586                 }
7587                 sctp_free_a_strmoq(stcb, sp, so_locked);
7588
7589                 /* we can't be locked to it */
7590                 *locked = 0;
7591                 stcb->asoc.locked_on_sending = NULL;
7592         } else {
7593                 /* more to go, we are locked */
7594                 *locked = 1;
7595         }
7596         asoc->chunks_on_out_queue++;
7597         strq->chunks_on_queues++;
7598         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7599         asoc->send_queue_cnt++;
7600 out_of:
7601         if (send_lock_up) {
7602                 SCTP_TCB_SEND_UNLOCK(stcb);
7603         }
7604         return (to_move);
7605 }
7606
7607
7608 static void
7609 sctp_fill_outqueue(struct sctp_tcb *stcb,
7610     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7611 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7612     SCTP_UNUSED
7613 #endif
7614 )
7615 {
7616         struct sctp_association *asoc;
7617         struct sctp_stream_out *strq;
7618         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7619         int locked, giveup;
7620
7621         SCTP_TCB_LOCK_ASSERT(stcb);
7622         asoc = &stcb->asoc;
7623         switch (net->ro._l_addr.sa.sa_family) {
7624 #ifdef INET
7625         case AF_INET:
7626                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7627                 break;
7628 #endif
7629 #ifdef INET6
7630         case AF_INET6:
7631                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7632                 break;
7633 #endif
7634         default:
7635                 /* TSNH */
7636                 goal_mtu = net->mtu;
7637                 break;
7638         }
7639         /* Need an allowance for the data chunk header too */
7640         goal_mtu -= sizeof(struct sctp_data_chunk);
7641
7642         /* must make even word boundary */
7643         goal_mtu &= 0xfffffffc;
7644         if (asoc->locked_on_sending) {
7645                 /* We are stuck on one stream until the message completes. */
7646                 strq = asoc->locked_on_sending;
7647                 locked = 1;
7648         } else {
7649                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7650                 locked = 0;
7651         }
7652         while ((goal_mtu > 0) && strq) {
7653                 giveup = 0;
7654                 bail = 0;
7655                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7656                     &giveup, eeor_mode, &bail, so_locked);
7657                 if (moved_how_much)
7658                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7659
7660                 if (locked) {
7661                         asoc->locked_on_sending = strq;
7662                         if ((moved_how_much == 0) || (giveup) || bail)
7663                                 /* no more to move for now */
7664                                 break;
7665                 } else {
7666                         asoc->locked_on_sending = NULL;
7667                         if ((giveup) || bail) {
7668                                 break;
7669                         }
7670                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7671                         if (strq == NULL) {
7672                                 break;
7673                         }
7674                 }
7675                 total_moved += moved_how_much;
7676                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7677                 goal_mtu &= 0xfffffffc;
7678         }
7679         if (bail)
7680                 *quit_now = 1;
7681
7682         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7683
7684         if (total_moved == 0) {
7685                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7686                     (net == stcb->asoc.primary_destination)) {
7687                         /* ran dry for primary network net */
7688                         SCTP_STAT_INCR(sctps_primary_randry);
7689                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7690                         /* ran dry with CMT on */
7691                         SCTP_STAT_INCR(sctps_cmt_randry);
7692                 }
7693         }
7694 }
7695
7696 void
7697 sctp_fix_ecn_echo(struct sctp_association *asoc)
7698 {
7699         struct sctp_tmit_chunk *chk;
7700
7701         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7702                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7703                         chk->sent = SCTP_DATAGRAM_UNSENT;
7704                 }
7705         }
7706 }
7707
7708 void
7709 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7710 {
7711         struct sctp_association *asoc;
7712         struct sctp_tmit_chunk *chk;
7713         struct sctp_stream_queue_pending *sp;
7714         unsigned int i;
7715
7716         if (net == NULL) {
7717                 return;
7718         }
7719         asoc = &stcb->asoc;
7720         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7721                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7722                         if (sp->net == net) {
7723                                 sctp_free_remote_addr(sp->net);
7724                                 sp->net = NULL;
7725                         }
7726                 }
7727         }
7728         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7729                 if (chk->whoTo == net) {
7730                         sctp_free_remote_addr(chk->whoTo);
7731                         chk->whoTo = NULL;
7732                 }
7733         }
7734 }
7735
7736 int
7737 sctp_med_chunk_output(struct sctp_inpcb *inp,
7738     struct sctp_tcb *stcb,
7739     struct sctp_association *asoc,
7740     int *num_out,
7741     int *reason_code,
7742     int control_only, int from_where,
7743     struct timeval *now, int *now_filled, int frag_point, int so_locked
7744 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7745     SCTP_UNUSED
7746 #endif
7747 )
7748 {
7749         /**
7750          * Ok this is the generic chunk service queue. we must do the
7751          * following: - Service the stream queue that is next, moving any
7752          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7753          * LAST to the out queue in one pass) and assigning TSN's - Check to
7754          * see if the cwnd/rwnd allows any output, if so we go ahead and
7755          * fomulate and send the low level chunks. Making sure to combine
7756          * any control in the control chunk queue also.
7757          */
7758         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7759         struct mbuf *outchain, *endoutchain;
7760         struct sctp_tmit_chunk *chk, *nchk;
7761
7762         /* temp arrays for unlinking */
7763         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7764         int no_fragmentflg, error;
7765         unsigned int max_rwnd_per_dest, max_send_per_dest;
7766         int one_chunk, hbflag, skip_data_for_this_net;
7767         int asconf, cookie, no_out_cnt;
7768         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7769         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7770         int tsns_sent = 0;
7771         uint32_t auth_offset = 0;
7772         struct sctp_auth_chunk *auth = NULL;
7773         uint16_t auth_keyid;
7774         int override_ok = 1;
7775         int skip_fill_up = 0;
7776         int data_auth_reqd = 0;
7777
7778         /*
7779          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7780          * destination.
7781          */
7782         int quit_now = 0;
7783
7784         *num_out = 0;
7785         *reason_code = 0;
7786         auth_keyid = stcb->asoc.authinfo.active_keyid;
7787         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7788             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7789             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7790                 eeor_mode = 1;
7791         } else {
7792                 eeor_mode = 0;
7793         }
7794         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7795         /*
7796          * First lets prime the pump. For each destination, if there is room
7797          * in the flight size, attempt to pull an MTU's worth out of the
7798          * stream queues into the general send_queue
7799          */
7800 #ifdef SCTP_AUDITING_ENABLED
7801         sctp_audit_log(0xC2, 2);
7802 #endif
7803         SCTP_TCB_LOCK_ASSERT(stcb);
7804         hbflag = 0;
7805         if (control_only)
7806                 no_data_chunks = 1;
7807         else
7808                 no_data_chunks = 0;
7809
7810         /* Nothing to possible to send? */
7811         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7812             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7813             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7814             TAILQ_EMPTY(&asoc->send_queue) &&
7815             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7816 nothing_to_send:
7817                 *reason_code = 9;
7818                 return (0);
7819         }
7820         if (asoc->peers_rwnd == 0) {
7821                 /* No room in peers rwnd */
7822                 *reason_code = 1;
7823                 if (asoc->total_flight > 0) {
7824                         /* we are allowed one chunk in flight */
7825                         no_data_chunks = 1;
7826                 }
7827         }
7828         if (stcb->asoc.ecn_echo_cnt_onq) {
7829                 /* Record where a sack goes, if any */
7830                 if (no_data_chunks &&
7831                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7832                         /* Nothing but ECNe to send - we don't do that */
7833                         goto nothing_to_send;
7834                 }
7835                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7836                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7837                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7838                                 sack_goes_to = chk->whoTo;
7839                                 break;
7840                         }
7841                 }
7842         }
7843         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7844         if (stcb->sctp_socket)
7845                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7846         else
7847                 max_send_per_dest = 0;
7848         if (no_data_chunks == 0) {
7849                 /* How many non-directed chunks are there? */
7850                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7851                         if (chk->whoTo == NULL) {
7852                                 /*
7853                                  * We already have non-directed chunks on
7854                                  * the queue, no need to do a fill-up.
7855                                  */
7856                                 skip_fill_up = 1;
7857                                 break;
7858                         }
7859                 }
7860
7861         }
7862         if ((no_data_chunks == 0) &&
7863             (skip_fill_up == 0) &&
7864             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7865                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7866                         /*
7867                          * This for loop we are in takes in each net, if
7868                          * its's got space in cwnd and has data sent to it
7869                          * (when CMT is off) then it calls
7870                          * sctp_fill_outqueue for the net. This gets data on
7871                          * the send queue for that network.
7872                          *
7873                          * In sctp_fill_outqueue TSN's are assigned and data is
7874                          * copied out of the stream buffers. Note mostly
7875                          * copy by reference (we hope).
7876                          */
7877                         net->window_probe = 0;
7878                         if ((net != stcb->asoc.alternate) &&
7879                             ((net->dest_state & SCTP_ADDR_PF) ||
7880                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7881                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7882                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7883                                         sctp_log_cwnd(stcb, net, 1,
7884                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7885                                 }
7886                                 continue;
7887                         }
7888                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7889                             (net->flight_size == 0)) {
7890                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7891                         }
7892                         if (net->flight_size >= net->cwnd) {
7893                                 /* skip this network, no room - can't fill */
7894                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7895                                         sctp_log_cwnd(stcb, net, 3,
7896                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7897                                 }
7898                                 continue;
7899                         }
7900                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7901                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7902                         }
7903                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7904                         if (quit_now) {
7905                                 /* memory alloc failure */
7906                                 no_data_chunks = 1;
7907                                 break;
7908                         }
7909                 }
7910         }
7911         /* now service each destination and send out what we can for it */
7912         /* Nothing to send? */
7913         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7914             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7915             TAILQ_EMPTY(&asoc->send_queue)) {
7916                 *reason_code = 8;
7917                 return (0);
7918         }
7919         if (asoc->sctp_cmt_on_off > 0) {
7920                 /* get the last start point */
7921                 start_at = asoc->last_net_cmt_send_started;
7922                 if (start_at == NULL) {
7923                         /* null so to beginning */
7924                         start_at = TAILQ_FIRST(&asoc->nets);
7925                 } else {
7926                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7927                         if (start_at == NULL) {
7928                                 start_at = TAILQ_FIRST(&asoc->nets);
7929                         }
7930                 }
7931                 asoc->last_net_cmt_send_started = start_at;
7932         } else {
7933                 start_at = TAILQ_FIRST(&asoc->nets);
7934         }
7935         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7936                 if (chk->whoTo == NULL) {
7937                         if (asoc->alternate) {
7938                                 chk->whoTo = asoc->alternate;
7939                         } else {
7940                                 chk->whoTo = asoc->primary_destination;
7941                         }
7942                         atomic_add_int(&chk->whoTo->ref_count, 1);
7943                 }
7944         }
7945         old_start_at = NULL;
7946 again_one_more_time:
7947         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7948                 /* how much can we send? */
7949                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7950                 if (old_start_at && (old_start_at == net)) {
7951                         /* through list ocmpletely. */
7952                         break;
7953                 }
7954                 tsns_sent = 0xa;
7955                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7956                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7957                     (net->flight_size >= net->cwnd)) {
7958                         /*
7959                          * Nothing on control or asconf and flight is full,
7960                          * we can skip even in the CMT case.
7961                          */
7962                         continue;
7963                 }
7964                 bundle_at = 0;
7965                 endoutchain = outchain = NULL;
7966                 no_fragmentflg = 1;
7967                 one_chunk = 0;
7968                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7969                         skip_data_for_this_net = 1;
7970                 } else {
7971                         skip_data_for_this_net = 0;
7972                 }
7973                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7974 #ifdef INET
7975                 case AF_INET:
7976                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7977                         break;
7978 #endif
7979 #ifdef INET6
7980                 case AF_INET6:
7981                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
7982                         break;
7983 #endif
7984                 default:
7985                         /* TSNH */
7986                         mtu = net->mtu;
7987                         break;
7988                 }
7989                 mx_mtu = mtu;
7990                 to_out = 0;
7991                 if (mtu > asoc->peers_rwnd) {
7992                         if (asoc->total_flight > 0) {
7993                                 /* We have a packet in flight somewhere */
7994                                 r_mtu = asoc->peers_rwnd;
7995                         } else {
7996                                 /* We are always allowed to send one MTU out */
7997                                 one_chunk = 1;
7998                                 r_mtu = mtu;
7999                         }
8000                 } else {
8001                         r_mtu = mtu;
8002                 }
8003                 error = 0;
8004                 /************************/
8005                 /* ASCONF transmission */
8006                 /************************/
8007                 /* Now first lets go through the asconf queue */
8008                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8009                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8010                                 continue;
8011                         }
8012                         if (chk->whoTo == NULL) {
8013                                 if (asoc->alternate == NULL) {
8014                                         if (asoc->primary_destination != net) {
8015                                                 break;
8016                                         }
8017                                 } else {
8018                                         if (asoc->alternate != net) {
8019                                                 break;
8020                                         }
8021                                 }
8022                         } else {
8023                                 if (chk->whoTo != net) {
8024                                         break;
8025                                 }
8026                         }
8027                         if (chk->data == NULL) {
8028                                 break;
8029                         }
8030                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8031                             chk->sent != SCTP_DATAGRAM_RESEND) {
8032                                 break;
8033                         }
8034                         /*
8035                          * if no AUTH is yet included and this chunk
8036                          * requires it, make sure to account for it.  We
8037                          * don't apply the size until the AUTH chunk is
8038                          * actually added below in case there is no room for
8039                          * this chunk. NOTE: we overload the use of "omtu"
8040                          * here
8041                          */
8042                         if ((auth == NULL) &&
8043                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8044                             stcb->asoc.peer_auth_chunks)) {
8045                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8046                         } else
8047                                 omtu = 0;
8048                         /* Here we do NOT factor the r_mtu */
8049                         if ((chk->send_size < (int)(mtu - omtu)) ||
8050                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8051                                 /*
8052                                  * We probably should glom the mbuf chain
8053                                  * from the chk->data for control but the
8054                                  * problem is it becomes yet one more level
8055                                  * of tracking to do if for some reason
8056                                  * output fails. Then I have got to
8057                                  * reconstruct the merged control chain.. el
8058                                  * yucko.. for now we take the easy way and
8059                                  * do the copy
8060                                  */
8061                                 /*
8062                                  * Add an AUTH chunk, if chunk requires it
8063                                  * save the offset into the chain for AUTH
8064                                  */
8065                                 if ((auth == NULL) &&
8066                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8067                                     stcb->asoc.peer_auth_chunks))) {
8068                                         outchain = sctp_add_auth_chunk(outchain,
8069                                             &endoutchain,
8070                                             &auth,
8071                                             &auth_offset,
8072                                             stcb,
8073                                             chk->rec.chunk_id.id);
8074                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8075                                 }
8076                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8077                                     (int)chk->rec.chunk_id.can_take_data,
8078                                     chk->send_size, chk->copy_by_ref);
8079                                 if (outchain == NULL) {
8080                                         *reason_code = 8;
8081                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8082                                         return (ENOMEM);
8083                                 }
8084                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8085                                 /* update our MTU size */
8086                                 if (mtu > (chk->send_size + omtu))
8087                                         mtu -= (chk->send_size + omtu);
8088                                 else
8089                                         mtu = 0;
8090                                 to_out += (chk->send_size + omtu);
8091                                 /* Do clear IP_DF ? */
8092                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8093                                         no_fragmentflg = 0;
8094                                 }
8095                                 if (chk->rec.chunk_id.can_take_data)
8096                                         chk->data = NULL;
8097                                 /*
8098                                  * set hb flag since we can use these for
8099                                  * RTO
8100                                  */
8101                                 hbflag = 1;
8102                                 asconf = 1;
8103                                 /*
8104                                  * should sysctl this: don't bundle data
8105                                  * with ASCONF since it requires AUTH
8106                                  */
8107                                 no_data_chunks = 1;
8108                                 chk->sent = SCTP_DATAGRAM_SENT;
8109                                 if (chk->whoTo == NULL) {
8110                                         chk->whoTo = net;
8111                                         atomic_add_int(&net->ref_count, 1);
8112                                 }
8113                                 chk->snd_count++;
8114                                 if (mtu == 0) {
8115                                         /*
8116                                          * Ok we are out of room but we can
8117                                          * output without effecting the
8118                                          * flight size since this little guy
8119                                          * is a control only packet.
8120                                          */
8121                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8122                                         /*
8123                                          * do NOT clear the asconf flag as
8124                                          * it is used to do appropriate
8125                                          * source address selection.
8126                                          */
8127                                         if (*now_filled == 0) {
8128                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8129                                                 *now_filled = 1;
8130                                         }
8131                                         net->last_sent_time = *now;
8132                                         hbflag = 0;
8133                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8134                                             (struct sockaddr *)&net->ro._l_addr,
8135                                             outchain, auth_offset, auth,
8136                                             stcb->asoc.authinfo.active_keyid,
8137                                             no_fragmentflg, 0, asconf,
8138                                             inp->sctp_lport, stcb->rport,
8139                                             htonl(stcb->asoc.peer_vtag),
8140                                             net->port, NULL,
8141                                             0, 0,
8142                                             so_locked))) {
8143                                                 /*
8144                                                  * error, we could not
8145                                                  * output
8146                                                  */
8147                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8148                                                 if (from_where == 0) {
8149                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8150                                                 }
8151                                                 if (error == ENOBUFS) {
8152                                                         asoc->ifp_had_enobuf = 1;
8153                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8154                                                 }
8155                                                 /* error, could not output */
8156                                                 if (error == EHOSTUNREACH) {
8157                                                         /*
8158                                                          * Destination went
8159                                                          * unreachable
8160                                                          * during this send
8161                                                          */
8162                                                         sctp_move_chunks_from_net(stcb, net);
8163                                                 }
8164                                                 *reason_code = 7;
8165                                                 break;
8166                                         } else {
8167                                                 asoc->ifp_had_enobuf = 0;
8168                                         }
8169                                         /*
8170                                          * increase the number we sent, if a
8171                                          * cookie is sent we don't tell them
8172                                          * any was sent out.
8173                                          */
8174                                         outchain = endoutchain = NULL;
8175                                         auth = NULL;
8176                                         auth_offset = 0;
8177                                         if (!no_out_cnt)
8178                                                 *num_out += ctl_cnt;
8179                                         /* recalc a clean slate and setup */
8180                                         switch (net->ro._l_addr.sa.sa_family) {
8181 #ifdef INET
8182                                         case AF_INET:
8183                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8184                                                 break;
8185 #endif
8186 #ifdef INET6
8187                                         case AF_INET6:
8188                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8189                                                 break;
8190 #endif
8191                                         default:
8192                                                 /* TSNH */
8193                                                 mtu = net->mtu;
8194                                                 break;
8195                                         }
8196                                         to_out = 0;
8197                                         no_fragmentflg = 1;
8198                                 }
8199                         }
8200                 }
8201                 if (error != 0) {
8202                         /* try next net */
8203                         continue;
8204                 }
8205                 /************************/
8206                 /* Control transmission */
8207                 /************************/
8208                 /* Now first lets go through the control queue */
8209                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8210                         if ((sack_goes_to) &&
8211                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8212                             (chk->whoTo != sack_goes_to)) {
8213                                 /*
8214                                  * if we have a sack in queue, and we are
8215                                  * looking at an ecn echo that is NOT queued
8216                                  * to where the sack is going..
8217                                  */
8218                                 if (chk->whoTo == net) {
8219                                         /*
8220                                          * Don't transmit it to where its
8221                                          * going (current net)
8222                                          */
8223                                         continue;
8224                                 } else if (sack_goes_to == net) {
8225                                         /*
8226                                          * But do transmit it to this
8227                                          * address
8228                                          */
8229                                         goto skip_net_check;
8230                                 }
8231                         }
8232                         if (chk->whoTo == NULL) {
8233                                 if (asoc->alternate == NULL) {
8234                                         if (asoc->primary_destination != net) {
8235                                                 continue;
8236                                         }
8237                                 } else {
8238                                         if (asoc->alternate != net) {
8239                                                 continue;
8240                                         }
8241                                 }
8242                         } else {
8243                                 if (chk->whoTo != net) {
8244                                         continue;
8245                                 }
8246                         }
8247         skip_net_check:
8248                         if (chk->data == NULL) {
8249                                 continue;
8250                         }
8251                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8252                                 /*
8253                                  * It must be unsent. Cookies and ASCONF's
8254                                  * hang around but there timers will force
8255                                  * when marked for resend.
8256                                  */
8257                                 continue;
8258                         }
8259                         /*
8260                          * if no AUTH is yet included and this chunk
8261                          * requires it, make sure to account for it.  We
8262                          * don't apply the size until the AUTH chunk is
8263                          * actually added below in case there is no room for
8264                          * this chunk. NOTE: we overload the use of "omtu"
8265                          * here
8266                          */
8267                         if ((auth == NULL) &&
8268                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8269                             stcb->asoc.peer_auth_chunks)) {
8270                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8271                         } else
8272                                 omtu = 0;
8273                         /* Here we do NOT factor the r_mtu */
8274                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8275                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8276                                 /*
8277                                  * We probably should glom the mbuf chain
8278                                  * from the chk->data for control but the
8279                                  * problem is it becomes yet one more level
8280                                  * of tracking to do if for some reason
8281                                  * output fails. Then I have got to
8282                                  * reconstruct the merged control chain.. el
8283                                  * yucko.. for now we take the easy way and
8284                                  * do the copy
8285                                  */
8286                                 /*
8287                                  * Add an AUTH chunk, if chunk requires it
8288                                  * save the offset into the chain for AUTH
8289                                  */
8290                                 if ((auth == NULL) &&
8291                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8292                                     stcb->asoc.peer_auth_chunks))) {
8293                                         outchain = sctp_add_auth_chunk(outchain,
8294                                             &endoutchain,
8295                                             &auth,
8296                                             &auth_offset,
8297                                             stcb,
8298                                             chk->rec.chunk_id.id);
8299                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8300                                 }
8301                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8302                                     (int)chk->rec.chunk_id.can_take_data,
8303                                     chk->send_size, chk->copy_by_ref);
8304                                 if (outchain == NULL) {
8305                                         *reason_code = 8;
8306                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8307                                         return (ENOMEM);
8308                                 }
8309                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8310                                 /* update our MTU size */
8311                                 if (mtu > (chk->send_size + omtu))
8312                                         mtu -= (chk->send_size + omtu);
8313                                 else
8314                                         mtu = 0;
8315                                 to_out += (chk->send_size + omtu);
8316                                 /* Do clear IP_DF ? */
8317                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8318                                         no_fragmentflg = 0;
8319                                 }
8320                                 if (chk->rec.chunk_id.can_take_data)
8321                                         chk->data = NULL;
8322                                 /* Mark things to be removed, if needed */
8323                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8324                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8325                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8326                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8327                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8328                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8329                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8330                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8331                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8332                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8333                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8334                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8335                                                 hbflag = 1;
8336                                         }
8337                                         /* remove these chunks at the end */
8338                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8339                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8340                                                 /* turn off the timer */
8341                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8342                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8343                                                             inp, stcb, net,
8344                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8345                                                 }
8346                                         }
8347                                         ctl_cnt++;
8348                                 } else {
8349                                         /*
8350                                          * Other chunks, since they have
8351                                          * timers running (i.e. COOKIE) we
8352                                          * just "trust" that it gets sent or
8353                                          * retransmitted.
8354                                          */
8355                                         ctl_cnt++;
8356                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8357                                                 cookie = 1;
8358                                                 no_out_cnt = 1;
8359                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8360                                                 /*
8361                                                  * Increment ecne send count
8362                                                  * here this means we may be
8363                                                  * over-zealous in our
8364                                                  * counting if the send
8365                                                  * fails, but its the best
8366                                                  * place to do it (we used
8367                                                  * to do it in the queue of
8368                                                  * the chunk, but that did
8369                                                  * not tell how many times
8370                                                  * it was sent.
8371                                                  */
8372                                                 SCTP_STAT_INCR(sctps_sendecne);
8373                                         }
8374                                         chk->sent = SCTP_DATAGRAM_SENT;
8375                                         if (chk->whoTo == NULL) {
8376                                                 chk->whoTo = net;
8377                                                 atomic_add_int(&net->ref_count, 1);
8378                                         }
8379                                         chk->snd_count++;
8380                                 }
8381                                 if (mtu == 0) {
8382                                         /*
8383                                          * Ok we are out of room but we can
8384                                          * output without effecting the
8385                                          * flight size since this little guy
8386                                          * is a control only packet.
8387                                          */
8388                                         if (asconf) {
8389                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8390                                                 /*
8391                                                  * do NOT clear the asconf
8392                                                  * flag as it is used to do
8393                                                  * appropriate source
8394                                                  * address selection.
8395                                                  */
8396                                         }
8397                                         if (cookie) {
8398                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8399                                                 cookie = 0;
8400                                         }
8401                                         /* Only HB or ASCONF advances time */
8402                                         if (hbflag) {
8403                                                 if (*now_filled == 0) {
8404                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8405                                                         *now_filled = 1;
8406                                                 }
8407                                                 net->last_sent_time = *now;
8408                                                 hbflag = 0;
8409                                         }
8410                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8411                                             (struct sockaddr *)&net->ro._l_addr,
8412                                             outchain,
8413                                             auth_offset, auth,
8414                                             stcb->asoc.authinfo.active_keyid,
8415                                             no_fragmentflg, 0, asconf,
8416                                             inp->sctp_lport, stcb->rport,
8417                                             htonl(stcb->asoc.peer_vtag),
8418                                             net->port, NULL,
8419                                             0, 0,
8420                                             so_locked))) {
8421                                                 /*
8422                                                  * error, we could not
8423                                                  * output
8424                                                  */
8425                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8426                                                 if (from_where == 0) {
8427                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8428                                                 }
8429                                                 if (error == ENOBUFS) {
8430                                                         asoc->ifp_had_enobuf = 1;
8431                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8432                                                 }
8433                                                 if (error == EHOSTUNREACH) {
8434                                                         /*
8435                                                          * Destination went
8436                                                          * unreachable
8437                                                          * during this send
8438                                                          */
8439                                                         sctp_move_chunks_from_net(stcb, net);
8440                                                 }
8441                                                 *reason_code = 7;
8442                                                 break;
8443                                         } else {
8444                                                 asoc->ifp_had_enobuf = 0;
8445                                         }
8446                                         /*
8447                                          * increase the number we sent, if a
8448                                          * cookie is sent we don't tell them
8449                                          * any was sent out.
8450                                          */
8451                                         outchain = endoutchain = NULL;
8452                                         auth = NULL;
8453                                         auth_offset = 0;
8454                                         if (!no_out_cnt)
8455                                                 *num_out += ctl_cnt;
8456                                         /* recalc a clean slate and setup */
8457                                         switch (net->ro._l_addr.sa.sa_family) {
8458 #ifdef INET
8459                                         case AF_INET:
8460                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8461                                                 break;
8462 #endif
8463 #ifdef INET6
8464                                         case AF_INET6:
8465                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8466                                                 break;
8467 #endif
8468                                         default:
8469                                                 /* TSNH */
8470                                                 mtu = net->mtu;
8471                                                 break;
8472                                         }
8473                                         to_out = 0;
8474                                         no_fragmentflg = 1;
8475                                 }
8476                         }
8477                 }
8478                 if (error != 0) {
8479                         /* try next net */
8480                         continue;
8481                 }
8482                 /* JRI: if dest is in PF state, do not send data to it */
8483                 if ((asoc->sctp_cmt_on_off > 0) &&
8484                     (net != stcb->asoc.alternate) &&
8485                     (net->dest_state & SCTP_ADDR_PF)) {
8486                         goto no_data_fill;
8487                 }
8488                 if (net->flight_size >= net->cwnd) {
8489                         goto no_data_fill;
8490                 }
8491                 if ((asoc->sctp_cmt_on_off > 0) &&
8492                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8493                     (net->flight_size > max_rwnd_per_dest)) {
8494                         goto no_data_fill;
8495                 }
8496                 /*
8497                  * We need a specific accounting for the usage of the send
8498                  * buffer. We also need to check the number of messages per
8499                  * net. For now, this is better than nothing and it disabled
8500                  * by default...
8501                  */
8502                 if ((asoc->sctp_cmt_on_off > 0) &&
8503                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8504                     (max_send_per_dest > 0) &&
8505                     (net->flight_size > max_send_per_dest)) {
8506                         goto no_data_fill;
8507                 }
8508                 /*********************/
8509                 /* Data transmission */
8510                 /*********************/
8511                 /*
8512                  * if AUTH for DATA is required and no AUTH has been added
8513                  * yet, account for this in the mtu now... if no data can be
8514                  * bundled, this adjustment won't matter anyways since the
8515                  * packet will be going out...
8516                  */
8517                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8518                     stcb->asoc.peer_auth_chunks);
8519                 if (data_auth_reqd && (auth == NULL)) {
8520                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8521                 }
8522                 /* now lets add any data within the MTU constraints */
8523                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8524 #ifdef INET
8525                 case AF_INET:
8526                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8527                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8528                         else
8529                                 omtu = 0;
8530                         break;
8531 #endif
8532 #ifdef INET6
8533                 case AF_INET6:
8534                         if (net->mtu > SCTP_MIN_OVERHEAD)
8535                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8536                         else
8537                                 omtu = 0;
8538                         break;
8539 #endif
8540                 default:
8541                         /* TSNH */
8542                         omtu = 0;
8543                         break;
8544                 }
8545                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8546                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8547                     (skip_data_for_this_net == 0)) ||
8548                     (cookie)) {
8549                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8550                                 if (no_data_chunks) {
8551                                         /* let only control go out */
8552                                         *reason_code = 1;
8553                                         break;
8554                                 }
8555                                 if (net->flight_size >= net->cwnd) {
8556                                         /* skip this net, no room for data */
8557                                         *reason_code = 2;
8558                                         break;
8559                                 }
8560                                 if ((chk->whoTo != NULL) &&
8561                                     (chk->whoTo != net)) {
8562                                         /* Don't send the chunk on this net */
8563                                         continue;
8564                                 }
8565                                 if (asoc->sctp_cmt_on_off == 0) {
8566                                         if ((asoc->alternate) &&
8567                                             (asoc->alternate != net) &&
8568                                             (chk->whoTo == NULL)) {
8569                                                 continue;
8570                                         } else if ((net != asoc->primary_destination) &&
8571                                                     (asoc->alternate == NULL) &&
8572                                             (chk->whoTo == NULL)) {
8573                                                 continue;
8574                                         }
8575                                 }
8576                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8577                                         /*-
8578                                          * strange, we have a chunk that is
8579                                          * to big for its destination and
8580                                          * yet no fragment ok flag.
8581                                          * Something went wrong when the
8582                                          * PMTU changed...we did not mark
8583                                          * this chunk for some reason?? I
8584                                          * will fix it here by letting IP
8585                                          * fragment it for now and printing
8586                                          * a warning. This really should not
8587                                          * happen ...
8588                                          */
8589                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8590                                             chk->send_size, mtu);
8591                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8592                                 }
8593                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8594                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8595                                         struct sctp_data_chunk *dchkh;
8596
8597                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8598                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8599                                 }
8600                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8601                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8602                                         /* ok we will add this one */
8603
8604                                         /*
8605                                          * Add an AUTH chunk, if chunk
8606                                          * requires it, save the offset into
8607                                          * the chain for AUTH
8608                                          */
8609                                         if (data_auth_reqd) {
8610                                                 if (auth == NULL) {
8611                                                         outchain = sctp_add_auth_chunk(outchain,
8612                                                             &endoutchain,
8613                                                             &auth,
8614                                                             &auth_offset,
8615                                                             stcb,
8616                                                             SCTP_DATA);
8617                                                         auth_keyid = chk->auth_keyid;
8618                                                         override_ok = 0;
8619                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8620                                                 } else if (override_ok) {
8621                                                         /*
8622                                                          * use this data's
8623                                                          * keyid
8624                                                          */
8625                                                         auth_keyid = chk->auth_keyid;
8626                                                         override_ok = 0;
8627                                                 } else if (auth_keyid != chk->auth_keyid) {
8628                                                         /*
8629                                                          * different keyid,
8630                                                          * so done bundling
8631                                                          */
8632                                                         break;
8633                                                 }
8634                                         }
8635                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8636                                             chk->send_size, chk->copy_by_ref);
8637                                         if (outchain == NULL) {
8638                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8639                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8640                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8641                                                 }
8642                                                 *reason_code = 3;
8643                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8644                                                 return (ENOMEM);
8645                                         }
8646                                         /* upate our MTU size */
8647                                         /* Do clear IP_DF ? */
8648                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8649                                                 no_fragmentflg = 0;
8650                                         }
8651                                         /* unsigned subtraction of mtu */
8652                                         if (mtu > chk->send_size)
8653                                                 mtu -= chk->send_size;
8654                                         else
8655                                                 mtu = 0;
8656                                         /* unsigned subtraction of r_mtu */
8657                                         if (r_mtu > chk->send_size)
8658                                                 r_mtu -= chk->send_size;
8659                                         else
8660                                                 r_mtu = 0;
8661
8662                                         to_out += chk->send_size;
8663                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8664 #ifdef INVARIANTS
8665                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8666 #else
8667                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8668                                                     mx_mtu, to_out);
8669 #endif
8670                                         }
8671                                         chk->window_probe = 0;
8672                                         data_list[bundle_at++] = chk;
8673                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8674                                                 break;
8675                                         }
8676                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8677                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8678                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8679                                                 } else {
8680                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8681                                                 }
8682                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8683                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8684                                                         /*
8685                                                          * Count number of
8686                                                          * user msg's that
8687                                                          * were fragmented
8688                                                          * we do this by
8689                                                          * counting when we
8690                                                          * see a LAST
8691                                                          * fragment only.
8692                                                          */
8693                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8694                                         }
8695                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8696                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8697                                                         data_list[0]->window_probe = 1;
8698                                                         net->window_probe = 1;
8699                                                 }
8700                                                 break;
8701                                         }
8702                                 } else {
8703                                         /*
8704                                          * Must be sent in order of the
8705                                          * TSN's (on a network)
8706                                          */
8707                                         break;
8708                                 }
8709                         }       /* for (chunk gather loop for this net) */
8710                 }               /* if asoc.state OPEN */
8711 no_data_fill:
8712                 /* Is there something to send for this destination? */
8713                 if (outchain) {
8714                         /* We may need to start a control timer or two */
8715                         if (asconf) {
8716                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8717                                     stcb, net);
8718                                 /*
8719                                  * do NOT clear the asconf flag as it is
8720                                  * used to do appropriate source address
8721                                  * selection.
8722                                  */
8723                         }
8724                         if (cookie) {
8725                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8726                                 cookie = 0;
8727                         }
8728                         /* must start a send timer if data is being sent */
8729                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8730                                 /*
8731                                  * no timer running on this destination
8732                                  * restart it.
8733                                  */
8734                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8735                         }
8736                         if (bundle_at || hbflag) {
8737                                 /* For data/asconf and hb set time */
8738                                 if (*now_filled == 0) {
8739                                         (void)SCTP_GETTIME_TIMEVAL(now);
8740                                         *now_filled = 1;
8741                                 }
8742                                 net->last_sent_time = *now;
8743                         }
8744                         /* Now send it, if there is anything to send :> */
8745                         if ((error = sctp_lowlevel_chunk_output(inp,
8746                             stcb,
8747                             net,
8748                             (struct sockaddr *)&net->ro._l_addr,
8749                             outchain,
8750                             auth_offset,
8751                             auth,
8752                             auth_keyid,
8753                             no_fragmentflg,
8754                             bundle_at,
8755                             asconf,
8756                             inp->sctp_lport, stcb->rport,
8757                             htonl(stcb->asoc.peer_vtag),
8758                             net->port, NULL,
8759                             0, 0,
8760                             so_locked))) {
8761                                 /* error, we could not output */
8762                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8763                                 if (from_where == 0) {
8764                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8765                                 }
8766                                 if (error == ENOBUFS) {
8767                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8768                                         asoc->ifp_had_enobuf = 1;
8769                                 }
8770                                 if (error == EHOSTUNREACH) {
8771                                         /*
8772                                          * Destination went unreachable
8773                                          * during this send
8774                                          */
8775                                         sctp_move_chunks_from_net(stcb, net);
8776                                 }
8777                                 *reason_code = 6;
8778                                 /*-
8779                                  * I add this line to be paranoid. As far as
8780                                  * I can tell the continue, takes us back to
8781                                  * the top of the for, but just to make sure
8782                                  * I will reset these again here.
8783                                  */
8784                                 ctl_cnt = bundle_at = 0;
8785                                 continue;       /* This takes us back to the
8786                                                  * for() for the nets. */
8787                         } else {
8788                                 asoc->ifp_had_enobuf = 0;
8789                         }
8790                         endoutchain = NULL;
8791                         auth = NULL;
8792                         auth_offset = 0;
8793                         if (!no_out_cnt) {
8794                                 *num_out += (ctl_cnt + bundle_at);
8795                         }
8796                         if (bundle_at) {
8797                                 /* setup for a RTO measurement */
8798                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8799                                 /* fill time if not already filled */
8800                                 if (*now_filled == 0) {
8801                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8802                                         *now_filled = 1;
8803                                         *now = asoc->time_last_sent;
8804                                 } else {
8805                                         asoc->time_last_sent = *now;
8806                                 }
8807                                 if (net->rto_needed) {
8808                                         data_list[0]->do_rtt = 1;
8809                                         net->rto_needed = 0;
8810                                 }
8811                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8812                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8813                         }
8814                         if (one_chunk) {
8815                                 break;
8816                         }
8817                 }
8818                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8819                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8820                 }
8821         }
8822         if (old_start_at == NULL) {
8823                 old_start_at = start_at;
8824                 start_at = TAILQ_FIRST(&asoc->nets);
8825                 if (old_start_at)
8826                         goto again_one_more_time;
8827         }
8828         /*
8829          * At the end there should be no NON timed chunks hanging on this
8830          * queue.
8831          */
8832         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8833                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8834         }
8835         if ((*num_out == 0) && (*reason_code == 0)) {
8836                 *reason_code = 4;
8837         } else {
8838                 *reason_code = 5;
8839         }
8840         sctp_clean_up_ctl(stcb, asoc, so_locked);
8841         return (0);
8842 }
8843
8844 void
8845 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8846 {
8847         /*-
8848          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8849          * the control chunk queue.
8850          */
8851         struct sctp_chunkhdr *hdr;
8852         struct sctp_tmit_chunk *chk;
8853         struct mbuf *mat, *last_mbuf;
8854         uint32_t chunk_length;
8855         uint16_t padding_length;
8856
8857         SCTP_TCB_LOCK_ASSERT(stcb);
8858         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8859         if (op_err == NULL) {
8860                 return;
8861         }
8862         last_mbuf = NULL;
8863         chunk_length = 0;
8864         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8865                 chunk_length += SCTP_BUF_LEN(mat);
8866                 if (SCTP_BUF_NEXT(mat) == NULL) {
8867                         last_mbuf = mat;
8868                 }
8869         }
8870         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8871                 sctp_m_freem(op_err);
8872                 return;
8873         }
8874         padding_length = chunk_length % 4;
8875         if (padding_length != 0) {
8876                 padding_length = 4 - padding_length;
8877         }
8878         if (padding_length != 0) {
8879                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8880                         sctp_m_freem(op_err);
8881                         return;
8882                 }
8883         }
8884         sctp_alloc_a_chunk(stcb, chk);
8885         if (chk == NULL) {
8886                 /* no memory */
8887                 sctp_m_freem(op_err);
8888                 return;
8889         }
8890         chk->copy_by_ref = 0;
8891         chk->send_size = (uint16_t) chunk_length;
8892         chk->sent = SCTP_DATAGRAM_UNSENT;
8893         chk->snd_count = 0;
8894         chk->asoc = &stcb->asoc;
8895         chk->data = op_err;
8896         chk->whoTo = NULL;
8897         hdr = mtod(op_err, struct sctp_chunkhdr *);
8898         hdr->chunk_type = SCTP_OPERATION_ERROR;
8899         hdr->chunk_flags = 0;
8900         hdr->chunk_length = htons(chk->send_size);
8901         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8902         chk->asoc->ctrl_queue_cnt++;
8903 }
8904
8905 int
8906 sctp_send_cookie_echo(struct mbuf *m,
8907     int offset,
8908     struct sctp_tcb *stcb,
8909     struct sctp_nets *net)
8910 {
8911         /*-
8912          * pull out the cookie and put it at the front of the control chunk
8913          * queue.
8914          */
8915         int at;
8916         struct mbuf *cookie;
8917         struct sctp_paramhdr parm, *phdr;
8918         struct sctp_chunkhdr *hdr;
8919         struct sctp_tmit_chunk *chk;
8920         uint16_t ptype, plen;
8921
8922         SCTP_TCB_LOCK_ASSERT(stcb);
8923         /* First find the cookie in the param area */
8924         cookie = NULL;
8925         at = offset + sizeof(struct sctp_init_chunk);
8926         for (;;) {
8927                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8928                 if (phdr == NULL) {
8929                         return (-3);
8930                 }
8931                 ptype = ntohs(phdr->param_type);
8932                 plen = ntohs(phdr->param_length);
8933                 if (ptype == SCTP_STATE_COOKIE) {
8934                         int pad;
8935
8936                         /* found the cookie */
8937                         if ((pad = (plen % 4))) {
8938                                 plen += 4 - pad;
8939                         }
8940                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8941                         if (cookie == NULL) {
8942                                 /* No memory */
8943                                 return (-2);
8944                         }
8945 #ifdef SCTP_MBUF_LOGGING
8946                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8947                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8948                         }
8949 #endif
8950                         break;
8951                 }
8952                 at += SCTP_SIZE32(plen);
8953         }
8954         /* ok, we got the cookie lets change it into a cookie echo chunk */
8955         /* first the change from param to cookie */
8956         hdr = mtod(cookie, struct sctp_chunkhdr *);
8957         hdr->chunk_type = SCTP_COOKIE_ECHO;
8958         hdr->chunk_flags = 0;
8959         /* get the chunk stuff now and place it in the FRONT of the queue */
8960         sctp_alloc_a_chunk(stcb, chk);
8961         if (chk == NULL) {
8962                 /* no memory */
8963                 sctp_m_freem(cookie);
8964                 return (-5);
8965         }
8966         chk->copy_by_ref = 0;
8967         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8968         chk->rec.chunk_id.can_take_data = 0;
8969         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8970         chk->send_size = plen;
8971         chk->sent = SCTP_DATAGRAM_UNSENT;
8972         chk->snd_count = 0;
8973         chk->asoc = &stcb->asoc;
8974         chk->data = cookie;
8975         chk->whoTo = net;
8976         atomic_add_int(&chk->whoTo->ref_count, 1);
8977         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8978         chk->asoc->ctrl_queue_cnt++;
8979         return (0);
8980 }
8981
8982 void
8983 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8984     struct mbuf *m,
8985     int offset,
8986     int chk_length,
8987     struct sctp_nets *net)
8988 {
8989         /*
8990          * take a HB request and make it into a HB ack and send it.
8991          */
8992         struct mbuf *outchain;
8993         struct sctp_chunkhdr *chdr;
8994         struct sctp_tmit_chunk *chk;
8995
8996
8997         if (net == NULL)
8998                 /* must have a net pointer */
8999                 return;
9000
9001         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9002         if (outchain == NULL) {
9003                 /* gak out of memory */
9004                 return;
9005         }
9006 #ifdef SCTP_MBUF_LOGGING
9007         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9008                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9009         }
9010 #endif
9011         chdr = mtod(outchain, struct sctp_chunkhdr *);
9012         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9013         chdr->chunk_flags = 0;
9014         if (chk_length % 4) {
9015                 /* need pad */
9016                 uint32_t cpthis = 0;
9017                 int padlen;
9018
9019                 padlen = 4 - (chk_length % 4);
9020                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9021         }
9022         sctp_alloc_a_chunk(stcb, chk);
9023         if (chk == NULL) {
9024                 /* no memory */
9025                 sctp_m_freem(outchain);
9026                 return;
9027         }
9028         chk->copy_by_ref = 0;
9029         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9030         chk->rec.chunk_id.can_take_data = 1;
9031         chk->flags = 0;
9032         chk->send_size = chk_length;
9033         chk->sent = SCTP_DATAGRAM_UNSENT;
9034         chk->snd_count = 0;
9035         chk->asoc = &stcb->asoc;
9036         chk->data = outchain;
9037         chk->whoTo = net;
9038         atomic_add_int(&chk->whoTo->ref_count, 1);
9039         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9040         chk->asoc->ctrl_queue_cnt++;
9041 }
9042
9043 void
9044 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9045 {
9046         /* formulate and queue a cookie-ack back to sender */
9047         struct mbuf *cookie_ack;
9048         struct sctp_chunkhdr *hdr;
9049         struct sctp_tmit_chunk *chk;
9050
9051         SCTP_TCB_LOCK_ASSERT(stcb);
9052
9053         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9054         if (cookie_ack == NULL) {
9055                 /* no mbuf's */
9056                 return;
9057         }
9058         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9059         sctp_alloc_a_chunk(stcb, chk);
9060         if (chk == NULL) {
9061                 /* no memory */
9062                 sctp_m_freem(cookie_ack);
9063                 return;
9064         }
9065         chk->copy_by_ref = 0;
9066         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9067         chk->rec.chunk_id.can_take_data = 1;
9068         chk->flags = 0;
9069         chk->send_size = sizeof(struct sctp_chunkhdr);
9070         chk->sent = SCTP_DATAGRAM_UNSENT;
9071         chk->snd_count = 0;
9072         chk->asoc = &stcb->asoc;
9073         chk->data = cookie_ack;
9074         if (chk->asoc->last_control_chunk_from != NULL) {
9075                 chk->whoTo = chk->asoc->last_control_chunk_from;
9076                 atomic_add_int(&chk->whoTo->ref_count, 1);
9077         } else {
9078                 chk->whoTo = NULL;
9079         }
9080         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9081         hdr->chunk_type = SCTP_COOKIE_ACK;
9082         hdr->chunk_flags = 0;
9083         hdr->chunk_length = htons(chk->send_size);
9084         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9085         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9086         chk->asoc->ctrl_queue_cnt++;
9087         return;
9088 }
9089
9090
9091 void
9092 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9093 {
9094         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9095         struct mbuf *m_shutdown_ack;
9096         struct sctp_shutdown_ack_chunk *ack_cp;
9097         struct sctp_tmit_chunk *chk;
9098
9099         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9100         if (m_shutdown_ack == NULL) {
9101                 /* no mbuf's */
9102                 return;
9103         }
9104         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9105         sctp_alloc_a_chunk(stcb, chk);
9106         if (chk == NULL) {
9107                 /* no memory */
9108                 sctp_m_freem(m_shutdown_ack);
9109                 return;
9110         }
9111         chk->copy_by_ref = 0;
9112         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9113         chk->rec.chunk_id.can_take_data = 1;
9114         chk->flags = 0;
9115         chk->send_size = sizeof(struct sctp_chunkhdr);
9116         chk->sent = SCTP_DATAGRAM_UNSENT;
9117         chk->snd_count = 0;
9118         chk->flags = 0;
9119         chk->asoc = &stcb->asoc;
9120         chk->data = m_shutdown_ack;
9121         chk->whoTo = net;
9122         if (chk->whoTo) {
9123                 atomic_add_int(&chk->whoTo->ref_count, 1);
9124         }
9125         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9126         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9127         ack_cp->ch.chunk_flags = 0;
9128         ack_cp->ch.chunk_length = htons(chk->send_size);
9129         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9130         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9131         chk->asoc->ctrl_queue_cnt++;
9132         return;
9133 }
9134
9135 void
9136 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9137 {
9138         /* formulate and queue a SHUTDOWN to the sender */
9139         struct mbuf *m_shutdown;
9140         struct sctp_shutdown_chunk *shutdown_cp;
9141         struct sctp_tmit_chunk *chk;
9142
9143         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9144         if (m_shutdown == NULL) {
9145                 /* no mbuf's */
9146                 return;
9147         }
9148         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9149         sctp_alloc_a_chunk(stcb, chk);
9150         if (chk == NULL) {
9151                 /* no memory */
9152                 sctp_m_freem(m_shutdown);
9153                 return;
9154         }
9155         chk->copy_by_ref = 0;
9156         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9157         chk->rec.chunk_id.can_take_data = 1;
9158         chk->flags = 0;
9159         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9160         chk->sent = SCTP_DATAGRAM_UNSENT;
9161         chk->snd_count = 0;
9162         chk->flags = 0;
9163         chk->asoc = &stcb->asoc;
9164         chk->data = m_shutdown;
9165         chk->whoTo = net;
9166         if (chk->whoTo) {
9167                 atomic_add_int(&chk->whoTo->ref_count, 1);
9168         }
9169         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9170         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9171         shutdown_cp->ch.chunk_flags = 0;
9172         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9173         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9174         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9175         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9176         chk->asoc->ctrl_queue_cnt++;
9177         return;
9178 }
9179
9180 void
9181 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9182 {
9183         /*
9184          * formulate and queue an ASCONF to the peer. ASCONF parameters
9185          * should be queued on the assoc queue.
9186          */
9187         struct sctp_tmit_chunk *chk;
9188         struct mbuf *m_asconf;
9189         int len;
9190
9191         SCTP_TCB_LOCK_ASSERT(stcb);
9192
9193         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9194             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9195                 /* can't send a new one if there is one in flight already */
9196                 return;
9197         }
9198         /* compose an ASCONF chunk, maximum length is PMTU */
9199         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9200         if (m_asconf == NULL) {
9201                 return;
9202         }
9203         sctp_alloc_a_chunk(stcb, chk);
9204         if (chk == NULL) {
9205                 /* no memory */
9206                 sctp_m_freem(m_asconf);
9207                 return;
9208         }
9209         chk->copy_by_ref = 0;
9210         chk->rec.chunk_id.id = SCTP_ASCONF;
9211         chk->rec.chunk_id.can_take_data = 0;
9212         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9213         chk->data = m_asconf;
9214         chk->send_size = len;
9215         chk->sent = SCTP_DATAGRAM_UNSENT;
9216         chk->snd_count = 0;
9217         chk->asoc = &stcb->asoc;
9218         chk->whoTo = net;
9219         if (chk->whoTo) {
9220                 atomic_add_int(&chk->whoTo->ref_count, 1);
9221         }
9222         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9223         chk->asoc->ctrl_queue_cnt++;
9224         return;
9225 }
9226
9227 void
9228 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9229 {
9230         /*
9231          * formulate and queue a asconf-ack back to sender. the asconf-ack
9232          * must be stored in the tcb.
9233          */
9234         struct sctp_tmit_chunk *chk;
9235         struct sctp_asconf_ack *ack, *latest_ack;
9236         struct mbuf *m_ack;
9237         struct sctp_nets *net = NULL;
9238
9239         SCTP_TCB_LOCK_ASSERT(stcb);
9240         /* Get the latest ASCONF-ACK */
9241         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9242         if (latest_ack == NULL) {
9243                 return;
9244         }
9245         if (latest_ack->last_sent_to != NULL &&
9246             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9247                 /* we're doing a retransmission */
9248                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9249                 if (net == NULL) {
9250                         /* no alternate */
9251                         if (stcb->asoc.last_control_chunk_from == NULL) {
9252                                 if (stcb->asoc.alternate) {
9253                                         net = stcb->asoc.alternate;
9254                                 } else {
9255                                         net = stcb->asoc.primary_destination;
9256                                 }
9257                         } else {
9258                                 net = stcb->asoc.last_control_chunk_from;
9259                         }
9260                 }
9261         } else {
9262                 /* normal case */
9263                 if (stcb->asoc.last_control_chunk_from == NULL) {
9264                         if (stcb->asoc.alternate) {
9265                                 net = stcb->asoc.alternate;
9266                         } else {
9267                                 net = stcb->asoc.primary_destination;
9268                         }
9269                 } else {
9270                         net = stcb->asoc.last_control_chunk_from;
9271                 }
9272         }
9273         latest_ack->last_sent_to = net;
9274
9275         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9276                 if (ack->data == NULL) {
9277                         continue;
9278                 }
9279                 /* copy the asconf_ack */
9280                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9281                 if (m_ack == NULL) {
9282                         /* couldn't copy it */
9283                         return;
9284                 }
9285 #ifdef SCTP_MBUF_LOGGING
9286                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9287                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9288                 }
9289 #endif
9290
9291                 sctp_alloc_a_chunk(stcb, chk);
9292                 if (chk == NULL) {
9293                         /* no memory */
9294                         if (m_ack)
9295                                 sctp_m_freem(m_ack);
9296                         return;
9297                 }
9298                 chk->copy_by_ref = 0;
9299                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9300                 chk->rec.chunk_id.can_take_data = 1;
9301                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9302                 chk->whoTo = net;
9303                 if (chk->whoTo) {
9304                         atomic_add_int(&chk->whoTo->ref_count, 1);
9305                 }
9306                 chk->data = m_ack;
9307                 chk->send_size = ack->len;
9308                 chk->sent = SCTP_DATAGRAM_UNSENT;
9309                 chk->snd_count = 0;
9310                 chk->asoc = &stcb->asoc;
9311
9312                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9313                 chk->asoc->ctrl_queue_cnt++;
9314         }
9315         return;
9316 }
9317
9318
9319 static int
9320 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9321     struct sctp_tcb *stcb,
9322     struct sctp_association *asoc,
9323     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9324 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9325     SCTP_UNUSED
9326 #endif
9327 )
9328 {
9329         /*-
9330          * send out one MTU of retransmission. If fast_retransmit is
9331          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9332          * rwnd. For a Cookie or Asconf in the control chunk queue we
9333          * retransmit them by themselves.
9334          *
9335          * For data chunks we will pick out the lowest TSN's in the sent_queue
9336          * marked for resend and bundle them all together (up to a MTU of
9337          * destination). The address to send to should have been
9338          * selected/changed where the retransmission was marked (i.e. in FR
9339          * or t3-timeout routines).
9340          */
9341         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9342         struct sctp_tmit_chunk *chk, *fwd;
9343         struct mbuf *m, *endofchain;
9344         struct sctp_nets *net = NULL;
9345         uint32_t tsns_sent = 0;
9346         int no_fragmentflg, bundle_at, cnt_thru;
9347         unsigned int mtu;
9348         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9349         struct sctp_auth_chunk *auth = NULL;
9350         uint32_t auth_offset = 0;
9351         uint16_t auth_keyid;
9352         int override_ok = 1;
9353         int data_auth_reqd = 0;
9354         uint32_t dmtu = 0;
9355
9356         SCTP_TCB_LOCK_ASSERT(stcb);
9357         tmr_started = ctl_cnt = bundle_at = error = 0;
9358         no_fragmentflg = 1;
9359         fwd_tsn = 0;
9360         *cnt_out = 0;
9361         fwd = NULL;
9362         endofchain = m = NULL;
9363         auth_keyid = stcb->asoc.authinfo.active_keyid;
9364 #ifdef SCTP_AUDITING_ENABLED
9365         sctp_audit_log(0xC3, 1);
9366 #endif
9367         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9368             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9369                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9370                     asoc->sent_queue_retran_cnt);
9371                 asoc->sent_queue_cnt = 0;
9372                 asoc->sent_queue_cnt_removeable = 0;
9373                 /* send back 0/0 so we enter normal transmission */
9374                 *cnt_out = 0;
9375                 return (0);
9376         }
9377         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9378                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9379                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9380                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9381                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9382                                 continue;
9383                         }
9384                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9385                                 if (chk != asoc->str_reset) {
9386                                         /*
9387                                          * not eligible for retran if its
9388                                          * not ours
9389                                          */
9390                                         continue;
9391                                 }
9392                         }
9393                         ctl_cnt++;
9394                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9395                                 fwd_tsn = 1;
9396                         }
9397                         /*
9398                          * Add an AUTH chunk, if chunk requires it save the
9399                          * offset into the chain for AUTH
9400                          */
9401                         if ((auth == NULL) &&
9402                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9403                             stcb->asoc.peer_auth_chunks))) {
9404                                 m = sctp_add_auth_chunk(m, &endofchain,
9405                                     &auth, &auth_offset,
9406                                     stcb,
9407                                     chk->rec.chunk_id.id);
9408                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9409                         }
9410                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9411                         break;
9412                 }
9413         }
9414         one_chunk = 0;
9415         cnt_thru = 0;
9416         /* do we have control chunks to retransmit? */
9417         if (m != NULL) {
9418                 /* Start a timer no matter if we suceed or fail */
9419                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9420                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9421                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9422                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9423                 chk->snd_count++;       /* update our count */
9424                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9425                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9426                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9427                     no_fragmentflg, 0, 0,
9428                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9429                     chk->whoTo->port, NULL,
9430                     0, 0,
9431                     so_locked))) {
9432                         SCTP_STAT_INCR(sctps_lowlevelerr);
9433                         return (error);
9434                 }
9435                 endofchain = NULL;
9436                 auth = NULL;
9437                 auth_offset = 0;
9438                 /*
9439                  * We don't want to mark the net->sent time here since this
9440                  * we use this for HB and retrans cannot measure RTT
9441                  */
9442                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9443                 *cnt_out += 1;
9444                 chk->sent = SCTP_DATAGRAM_SENT;
9445                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9446                 if (fwd_tsn == 0) {
9447                         return (0);
9448                 } else {
9449                         /* Clean up the fwd-tsn list */
9450                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9451                         return (0);
9452                 }
9453         }
9454         /*
9455          * Ok, it is just data retransmission we need to do or that and a
9456          * fwd-tsn with it all.
9457          */
9458         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9459                 return (SCTP_RETRAN_DONE);
9460         }
9461         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9462             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9463                 /* not yet open, resend the cookie and that is it */
9464                 return (1);
9465         }
9466 #ifdef SCTP_AUDITING_ENABLED
9467         sctp_auditing(20, inp, stcb, NULL);
9468 #endif
9469         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9470         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9471                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9472                         /* No, not sent to this net or not ready for rtx */
9473                         continue;
9474                 }
9475                 if (chk->data == NULL) {
9476                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9477                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9478                         continue;
9479                 }
9480                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9481                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9482                         struct mbuf *op_err;
9483                         char msg[SCTP_DIAG_INFO_LEN];
9484
9485                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9486                             chk->rec.data.TSN_seq, chk->snd_count);
9487                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9488                             msg);
9489                         atomic_add_int(&stcb->asoc.refcnt, 1);
9490                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9491                             so_locked);
9492                         SCTP_TCB_LOCK(stcb);
9493                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9494                         return (SCTP_RETRAN_EXIT);
9495                 }
9496                 /* pick up the net */
9497                 net = chk->whoTo;
9498                 switch (net->ro._l_addr.sa.sa_family) {
9499 #ifdef INET
9500                 case AF_INET:
9501                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9502                         break;
9503 #endif
9504 #ifdef INET6
9505                 case AF_INET6:
9506                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9507                         break;
9508 #endif
9509                 default:
9510                         /* TSNH */
9511                         mtu = net->mtu;
9512                         break;
9513                 }
9514
9515                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9516                         /* No room in peers rwnd */
9517                         uint32_t tsn;
9518
9519                         tsn = asoc->last_acked_seq + 1;
9520                         if (tsn == chk->rec.data.TSN_seq) {
9521                                 /*
9522                                  * we make a special exception for this
9523                                  * case. The peer has no rwnd but is missing
9524                                  * the lowest chunk.. which is probably what
9525                                  * is holding up the rwnd.
9526                                  */
9527                                 goto one_chunk_around;
9528                         }
9529                         return (1);
9530                 }
9531 one_chunk_around:
9532                 if (asoc->peers_rwnd < mtu) {
9533                         one_chunk = 1;
9534                         if ((asoc->peers_rwnd == 0) &&
9535                             (asoc->total_flight == 0)) {
9536                                 chk->window_probe = 1;
9537                                 chk->whoTo->window_probe = 1;
9538                         }
9539                 }
9540 #ifdef SCTP_AUDITING_ENABLED
9541                 sctp_audit_log(0xC3, 2);
9542 #endif
9543                 bundle_at = 0;
9544                 m = NULL;
9545                 net->fast_retran_ip = 0;
9546                 if (chk->rec.data.doing_fast_retransmit == 0) {
9547                         /*
9548                          * if no FR in progress skip destination that have
9549                          * flight_size > cwnd.
9550                          */
9551                         if (net->flight_size >= net->cwnd) {
9552                                 continue;
9553                         }
9554                 } else {
9555                         /*
9556                          * Mark the destination net to have FR recovery
9557                          * limits put on it.
9558                          */
9559                         *fr_done = 1;
9560                         net->fast_retran_ip = 1;
9561                 }
9562
9563                 /*
9564                  * if no AUTH is yet included and this chunk requires it,
9565                  * make sure to account for it.  We don't apply the size
9566                  * until the AUTH chunk is actually added below in case
9567                  * there is no room for this chunk.
9568                  */
9569                 if (data_auth_reqd && (auth == NULL)) {
9570                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9571                 } else
9572                         dmtu = 0;
9573
9574                 if ((chk->send_size <= (mtu - dmtu)) ||
9575                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9576                         /* ok we will add this one */
9577                         if (data_auth_reqd) {
9578                                 if (auth == NULL) {
9579                                         m = sctp_add_auth_chunk(m,
9580                                             &endofchain,
9581                                             &auth,
9582                                             &auth_offset,
9583                                             stcb,
9584                                             SCTP_DATA);
9585                                         auth_keyid = chk->auth_keyid;
9586                                         override_ok = 0;
9587                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9588                                 } else if (override_ok) {
9589                                         auth_keyid = chk->auth_keyid;
9590                                         override_ok = 0;
9591                                 } else if (chk->auth_keyid != auth_keyid) {
9592                                         /* different keyid, so done bundling */
9593                                         break;
9594                                 }
9595                         }
9596                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9597                         if (m == NULL) {
9598                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9599                                 return (ENOMEM);
9600                         }
9601                         /* Do clear IP_DF ? */
9602                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9603                                 no_fragmentflg = 0;
9604                         }
9605                         /* upate our MTU size */
9606                         if (mtu > (chk->send_size + dmtu))
9607                                 mtu -= (chk->send_size + dmtu);
9608                         else
9609                                 mtu = 0;
9610                         data_list[bundle_at++] = chk;
9611                         if (one_chunk && (asoc->total_flight <= 0)) {
9612                                 SCTP_STAT_INCR(sctps_windowprobed);
9613                         }
9614                 }
9615                 if (one_chunk == 0) {
9616                         /*
9617                          * now are there anymore forward from chk to pick
9618                          * up?
9619                          */
9620                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9621                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9622                                         /* Nope, not for retran */
9623                                         continue;
9624                                 }
9625                                 if (fwd->whoTo != net) {
9626                                         /* Nope, not the net in question */
9627                                         continue;
9628                                 }
9629                                 if (data_auth_reqd && (auth == NULL)) {
9630                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9631                                 } else
9632                                         dmtu = 0;
9633                                 if (fwd->send_size <= (mtu - dmtu)) {
9634                                         if (data_auth_reqd) {
9635                                                 if (auth == NULL) {
9636                                                         m = sctp_add_auth_chunk(m,
9637                                                             &endofchain,
9638                                                             &auth,
9639                                                             &auth_offset,
9640                                                             stcb,
9641                                                             SCTP_DATA);
9642                                                         auth_keyid = fwd->auth_keyid;
9643                                                         override_ok = 0;
9644                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9645                                                 } else if (override_ok) {
9646                                                         auth_keyid = fwd->auth_keyid;
9647                                                         override_ok = 0;
9648                                                 } else if (fwd->auth_keyid != auth_keyid) {
9649                                                         /*
9650                                                          * different keyid,
9651                                                          * so done bundling
9652                                                          */
9653                                                         break;
9654                                                 }
9655                                         }
9656                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9657                                         if (m == NULL) {
9658                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9659                                                 return (ENOMEM);
9660                                         }
9661                                         /* Do clear IP_DF ? */
9662                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9663                                                 no_fragmentflg = 0;
9664                                         }
9665                                         /* upate our MTU size */
9666                                         if (mtu > (fwd->send_size + dmtu))
9667                                                 mtu -= (fwd->send_size + dmtu);
9668                                         else
9669                                                 mtu = 0;
9670                                         data_list[bundle_at++] = fwd;
9671                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9672                                                 break;
9673                                         }
9674                                 } else {
9675                                         /* can't fit so we are done */
9676                                         break;
9677                                 }
9678                         }
9679                 }
9680                 /* Is there something to send for this destination? */
9681                 if (m) {
9682                         /*
9683                          * No matter if we fail/or suceed we should start a
9684                          * timer. A failure is like a lost IP packet :-)
9685                          */
9686                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9687                                 /*
9688                                  * no timer running on this destination
9689                                  * restart it.
9690                                  */
9691                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9692                                 tmr_started = 1;
9693                         }
9694                         /* Now lets send it, if there is anything to send :> */
9695                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9696                             (struct sockaddr *)&net->ro._l_addr, m,
9697                             auth_offset, auth, auth_keyid,
9698                             no_fragmentflg, 0, 0,
9699                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9700                             net->port, NULL,
9701                             0, 0,
9702                             so_locked))) {
9703                                 /* error, we could not output */
9704                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9705                                 return (error);
9706                         }
9707                         endofchain = NULL;
9708                         auth = NULL;
9709                         auth_offset = 0;
9710                         /* For HB's */
9711                         /*
9712                          * We don't want to mark the net->sent time here
9713                          * since this we use this for HB and retrans cannot
9714                          * measure RTT
9715                          */
9716                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9717
9718                         /* For auto-close */
9719                         cnt_thru++;
9720                         if (*now_filled == 0) {
9721                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9722                                 *now = asoc->time_last_sent;
9723                                 *now_filled = 1;
9724                         } else {
9725                                 asoc->time_last_sent = *now;
9726                         }
9727                         *cnt_out += bundle_at;
9728 #ifdef SCTP_AUDITING_ENABLED
9729                         sctp_audit_log(0xC4, bundle_at);
9730 #endif
9731                         if (bundle_at) {
9732                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9733                         }
9734                         for (i = 0; i < bundle_at; i++) {
9735                                 SCTP_STAT_INCR(sctps_sendretransdata);
9736                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9737                                 /*
9738                                  * When we have a revoked data, and we
9739                                  * retransmit it, then we clear the revoked
9740                                  * flag since this flag dictates if we
9741                                  * subtracted from the fs
9742                                  */
9743                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9744                                         /* Deflate the cwnd */
9745                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9746                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9747                                 }
9748                                 data_list[i]->snd_count++;
9749                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9750                                 /* record the time */
9751                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9752                                 if (data_list[i]->book_size_scale) {
9753                                         /*
9754                                          * need to double the book size on
9755                                          * this one
9756                                          */
9757                                         data_list[i]->book_size_scale = 0;
9758                                         /*
9759                                          * Since we double the booksize, we
9760                                          * must also double the output queue
9761                                          * size, since this get shrunk when
9762                                          * we free by this amount.
9763                                          */
9764                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9765                                         data_list[i]->book_size *= 2;
9766
9767
9768                                 } else {
9769                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9770                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9771                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9772                                         }
9773                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9774                                             (uint32_t) (data_list[i]->send_size +
9775                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9776                                 }
9777                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9778                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9779                                             data_list[i]->whoTo->flight_size,
9780                                             data_list[i]->book_size,
9781                                             (uintptr_t) data_list[i]->whoTo,
9782                                             data_list[i]->rec.data.TSN_seq);
9783                                 }
9784                                 sctp_flight_size_increase(data_list[i]);
9785                                 sctp_total_flight_increase(stcb, data_list[i]);
9786                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9787                                         /* SWS sender side engages */
9788                                         asoc->peers_rwnd = 0;
9789                                 }
9790                                 if ((i == 0) &&
9791                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9792                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9793                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9794                                             (tmr_started == 0)) {
9795                                                 /*-
9796                                                  * ok we just fast-retrans'd
9797                                                  * the lowest TSN, i.e the
9798                                                  * first on the list. In
9799                                                  * this case we want to give
9800                                                  * some more time to get a
9801                                                  * SACK back without a
9802                                                  * t3-expiring.
9803                                                  */
9804                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9805                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9806                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9807                                         }
9808                                 }
9809                         }
9810                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9811                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9812                         }
9813 #ifdef SCTP_AUDITING_ENABLED
9814                         sctp_auditing(21, inp, stcb, NULL);
9815 #endif
9816                 } else {
9817                         /* None will fit */
9818                         return (1);
9819                 }
9820                 if (asoc->sent_queue_retran_cnt <= 0) {
9821                         /* all done we have no more to retran */
9822                         asoc->sent_queue_retran_cnt = 0;
9823                         break;
9824                 }
9825                 if (one_chunk) {
9826                         /* No more room in rwnd */
9827                         return (1);
9828                 }
9829                 /* stop the for loop here. we sent out a packet */
9830                 break;
9831         }
9832         return (0);
9833 }
9834
9835 static void
9836 sctp_timer_validation(struct sctp_inpcb *inp,
9837     struct sctp_tcb *stcb,
9838     struct sctp_association *asoc)
9839 {
9840         struct sctp_nets *net;
9841
9842         /* Validate that a timer is running somewhere */
9843         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9844                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9845                         /* Here is a timer */
9846                         return;
9847                 }
9848         }
9849         SCTP_TCB_LOCK_ASSERT(stcb);
9850         /* Gak, we did not have a timer somewhere */
9851         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9852         if (asoc->alternate) {
9853                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9854         } else {
9855                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9856         }
9857         return;
9858 }
9859
9860 void
9861 sctp_chunk_output(struct sctp_inpcb *inp,
9862     struct sctp_tcb *stcb,
9863     int from_where,
9864     int so_locked
9865 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9866     SCTP_UNUSED
9867 #endif
9868 )
9869 {
9870         /*-
9871          * Ok this is the generic chunk service queue. we must do the
9872          * following:
9873          * - See if there are retransmits pending, if so we must
9874          *   do these first.
9875          * - Service the stream queue that is next, moving any
9876          *   message (note I must get a complete message i.e.
9877          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9878          *   TSN's
9879          * - Check to see if the cwnd/rwnd allows any output, if so we
9880          *   go ahead and fomulate and send the low level chunks. Making sure
9881          *   to combine any control in the control chunk queue also.
9882          */
9883         struct sctp_association *asoc;
9884         struct sctp_nets *net;
9885         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9886         unsigned int burst_cnt = 0;
9887         struct timeval now;
9888         int now_filled = 0;
9889         int nagle_on;
9890         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9891         int un_sent = 0;
9892         int fr_done;
9893         unsigned int tot_frs = 0;
9894
9895         asoc = &stcb->asoc;
9896 do_it_again:
9897         /* The Nagle algorithm is only applied when handling a send call. */
9898         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9899                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9900                         nagle_on = 0;
9901                 } else {
9902                         nagle_on = 1;
9903                 }
9904         } else {
9905                 nagle_on = 0;
9906         }
9907         SCTP_TCB_LOCK_ASSERT(stcb);
9908
9909         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9910
9911         if ((un_sent <= 0) &&
9912             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9913             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9914             (asoc->sent_queue_retran_cnt == 0) &&
9915             (asoc->trigger_reset == 0)) {
9916                 /* Nothing to do unless there is something to be sent left */
9917                 return;
9918         }
9919         /*
9920          * Do we have something to send, data or control AND a sack timer
9921          * running, if so piggy-back the sack.
9922          */
9923         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9924                 sctp_send_sack(stcb, so_locked);
9925                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9926         }
9927         while (asoc->sent_queue_retran_cnt) {
9928                 /*-
9929                  * Ok, it is retransmission time only, we send out only ONE
9930                  * packet with a single call off to the retran code.
9931                  */
9932                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9933                         /*-
9934                          * Special hook for handling cookiess discarded
9935                          * by peer that carried data. Send cookie-ack only
9936                          * and then the next call with get the retran's.
9937                          */
9938                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9939                             from_where,
9940                             &now, &now_filled, frag_point, so_locked);
9941                         return;
9942                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9943                         /* if its not from a HB then do it */
9944                         fr_done = 0;
9945                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9946                         if (fr_done) {
9947                                 tot_frs++;
9948                         }
9949                 } else {
9950                         /*
9951                          * its from any other place, we don't allow retran
9952                          * output (only control)
9953                          */
9954                         ret = 1;
9955                 }
9956                 if (ret > 0) {
9957                         /* Can't send anymore */
9958                         /*-
9959                          * now lets push out control by calling med-level
9960                          * output once. this assures that we WILL send HB's
9961                          * if queued too.
9962                          */
9963                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9964                             from_where,
9965                             &now, &now_filled, frag_point, so_locked);
9966 #ifdef SCTP_AUDITING_ENABLED
9967                         sctp_auditing(8, inp, stcb, NULL);
9968 #endif
9969                         sctp_timer_validation(inp, stcb, asoc);
9970                         return;
9971                 }
9972                 if (ret < 0) {
9973                         /*-
9974                          * The count was off.. retran is not happening so do
9975                          * the normal retransmission.
9976                          */
9977 #ifdef SCTP_AUDITING_ENABLED
9978                         sctp_auditing(9, inp, stcb, NULL);
9979 #endif
9980                         if (ret == SCTP_RETRAN_EXIT) {
9981                                 return;
9982                         }
9983                         break;
9984                 }
9985                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9986                         /* Only one transmission allowed out of a timeout */
9987 #ifdef SCTP_AUDITING_ENABLED
9988                         sctp_auditing(10, inp, stcb, NULL);
9989 #endif
9990                         /* Push out any control */
9991                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9992                             &now, &now_filled, frag_point, so_locked);
9993                         return;
9994                 }
9995                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9996                         /* Hit FR burst limit */
9997                         return;
9998                 }
9999                 if ((num_out == 0) && (ret == 0)) {
10000                         /* No more retrans to send */
10001                         break;
10002                 }
10003         }
10004 #ifdef SCTP_AUDITING_ENABLED
10005         sctp_auditing(12, inp, stcb, NULL);
10006 #endif
10007         /* Check for bad destinations, if they exist move chunks around. */
10008         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10009                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10010                         /*-
10011                          * if possible move things off of this address we
10012                          * still may send below due to the dormant state but
10013                          * we try to find an alternate address to send to
10014                          * and if we have one we move all queued data on the
10015                          * out wheel to this alternate address.
10016                          */
10017                         if (net->ref_count > 1)
10018                                 sctp_move_chunks_from_net(stcb, net);
10019                 } else {
10020                         /*-
10021                          * if ((asoc->sat_network) || (net->addr_is_local))
10022                          * { burst_limit = asoc->max_burst *
10023                          * SCTP_SAT_NETWORK_BURST_INCR; }
10024                          */
10025                         if (asoc->max_burst > 0) {
10026                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10027                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10028                                                 /*
10029                                                  * JRS - Use the congestion
10030                                                  * control given in the
10031                                                  * congestion control module
10032                                                  */
10033                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10034                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10035                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10036                                                 }
10037                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10038                                         }
10039                                         net->fast_retran_ip = 0;
10040                                 } else {
10041                                         if (net->flight_size == 0) {
10042                                                 /*
10043                                                  * Should be decaying the
10044                                                  * cwnd here
10045                                                  */
10046                                                 ;
10047                                         }
10048                                 }
10049                         }
10050                 }
10051
10052         }
10053         burst_cnt = 0;
10054         do {
10055                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10056                     &reason_code, 0, from_where,
10057                     &now, &now_filled, frag_point, so_locked);
10058                 if (error) {
10059                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10060                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10061                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10062                         }
10063                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10064                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10065                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10066                         }
10067                         break;
10068                 }
10069                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10070
10071                 tot_out += num_out;
10072                 burst_cnt++;
10073                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10074                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10075                         if (num_out == 0) {
10076                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10077                         }
10078                 }
10079                 if (nagle_on) {
10080                         /*
10081                          * When the Nagle algorithm is used, look at how
10082                          * much is unsent, then if its smaller than an MTU
10083                          * and we have data in flight we stop, except if we
10084                          * are handling a fragmented user message.
10085                          */
10086                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10087                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10088                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10089                             (stcb->asoc.total_flight > 0) &&
10090                             ((stcb->asoc.locked_on_sending == NULL) ||
10091                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10092                                 break;
10093                         }
10094                 }
10095                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10096                     TAILQ_EMPTY(&asoc->send_queue) &&
10097                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10098                         /* Nothing left to send */
10099                         break;
10100                 }
10101                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10102                         /* Nothing left to send */
10103                         break;
10104                 }
10105         } while (num_out &&
10106             ((asoc->max_burst == 0) ||
10107             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10108             (burst_cnt < asoc->max_burst)));
10109
10110         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10111                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10112                         SCTP_STAT_INCR(sctps_maxburstqueued);
10113                         asoc->burst_limit_applied = 1;
10114                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10115                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10116                         }
10117                 } else {
10118                         asoc->burst_limit_applied = 0;
10119                 }
10120         }
10121         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10122                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10123         }
10124         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10125             tot_out);
10126
10127         /*-
10128          * Now we need to clean up the control chunk chain if a ECNE is on
10129          * it. It must be marked as UNSENT again so next call will continue
10130          * to send it until such time that we get a CWR, to remove it.
10131          */
10132         if (stcb->asoc.ecn_echo_cnt_onq)
10133                 sctp_fix_ecn_echo(asoc);
10134
10135         if (stcb->asoc.trigger_reset) {
10136                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10137                         goto do_it_again;
10138                 }
10139         }
10140         return;
10141 }
10142
10143
10144 int
10145 sctp_output(
10146     struct sctp_inpcb *inp,
10147     struct mbuf *m,
10148     struct sockaddr *addr,
10149     struct mbuf *control,
10150     struct thread *p,
10151     int flags)
10152 {
10153         if (inp == NULL) {
10154                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10155                 return (EINVAL);
10156         }
10157         if (inp->sctp_socket == NULL) {
10158                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10159                 return (EINVAL);
10160         }
10161         return (sctp_sosend(inp->sctp_socket,
10162             addr,
10163             (struct uio *)NULL,
10164             m,
10165             control,
10166             flags, p
10167             ));
10168 }
10169
10170 void
10171 send_forward_tsn(struct sctp_tcb *stcb,
10172     struct sctp_association *asoc)
10173 {
10174         struct sctp_tmit_chunk *chk;
10175         struct sctp_forward_tsn_chunk *fwdtsn;
10176         uint32_t advance_peer_ack_point;
10177
10178         SCTP_TCB_LOCK_ASSERT(stcb);
10179         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10180                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10181                         /* mark it to unsent */
10182                         chk->sent = SCTP_DATAGRAM_UNSENT;
10183                         chk->snd_count = 0;
10184                         /* Do we correct its output location? */
10185                         if (chk->whoTo) {
10186                                 sctp_free_remote_addr(chk->whoTo);
10187                                 chk->whoTo = NULL;
10188                         }
10189                         goto sctp_fill_in_rest;
10190                 }
10191         }
10192         /* Ok if we reach here we must build one */
10193         sctp_alloc_a_chunk(stcb, chk);
10194         if (chk == NULL) {
10195                 return;
10196         }
10197         asoc->fwd_tsn_cnt++;
10198         chk->copy_by_ref = 0;
10199         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10200         chk->rec.chunk_id.can_take_data = 0;
10201         chk->flags = 0;
10202         chk->asoc = asoc;
10203         chk->whoTo = NULL;
10204         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10205         if (chk->data == NULL) {
10206                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10207                 return;
10208         }
10209         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10210         chk->sent = SCTP_DATAGRAM_UNSENT;
10211         chk->snd_count = 0;
10212         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10213         asoc->ctrl_queue_cnt++;
10214 sctp_fill_in_rest:
10215         /*-
10216          * Here we go through and fill out the part that deals with
10217          * stream/seq of the ones we skip.
10218          */
10219         SCTP_BUF_LEN(chk->data) = 0;
10220         {
10221                 struct sctp_tmit_chunk *at, *tp1, *last;
10222                 struct sctp_strseq *strseq;
10223                 unsigned int cnt_of_space, i, ovh;
10224                 unsigned int space_needed;
10225                 unsigned int cnt_of_skipped = 0;
10226
10227                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10228                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10229                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10230                                 /* no more to look at */
10231                                 break;
10232                         }
10233                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10234                                 /* We don't report these */
10235                                 continue;
10236                         }
10237                         cnt_of_skipped++;
10238                 }
10239                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10240                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10241
10242                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10243
10244                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10245                         ovh = SCTP_MIN_OVERHEAD;
10246                 } else {
10247                         ovh = SCTP_MIN_V4_OVERHEAD;
10248                 }
10249                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10250                         /* trim to a mtu size */
10251                         cnt_of_space = asoc->smallest_mtu - ovh;
10252                 }
10253                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10254                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10255                             0xff, 0, cnt_of_skipped,
10256                             asoc->advanced_peer_ack_point);
10257
10258                 }
10259                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10260                 if (cnt_of_space < space_needed) {
10261                         /*-
10262                          * ok we must trim down the chunk by lowering the
10263                          * advance peer ack point.
10264                          */
10265                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10266                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10267                                     0xff, 0xff, cnt_of_space,
10268                                     space_needed);
10269                         }
10270                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10271                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10272                         /*-
10273                          * Go through and find the TSN that will be the one
10274                          * we report.
10275                          */
10276                         at = TAILQ_FIRST(&asoc->sent_queue);
10277                         if (at != NULL) {
10278                                 for (i = 0; i < cnt_of_skipped; i++) {
10279                                         tp1 = TAILQ_NEXT(at, sctp_next);
10280                                         if (tp1 == NULL) {
10281                                                 break;
10282                                         }
10283                                         at = tp1;
10284                                 }
10285                         }
10286                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10287                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10288                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10289                                     asoc->advanced_peer_ack_point);
10290                         }
10291                         last = at;
10292                         /*-
10293                          * last now points to last one I can report, update
10294                          * peer ack point
10295                          */
10296                         if (last)
10297                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10298                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10299                             cnt_of_skipped * sizeof(struct sctp_strseq);
10300                 }
10301                 chk->send_size = space_needed;
10302                 /* Setup the chunk */
10303                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10304                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10305                 fwdtsn->ch.chunk_flags = 0;
10306                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10307                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10308                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10309                 fwdtsn++;
10310                 /*-
10311                  * Move pointer to after the fwdtsn and transfer to the
10312                  * strseq pointer.
10313                  */
10314                 strseq = (struct sctp_strseq *)fwdtsn;
10315                 /*-
10316                  * Now populate the strseq list. This is done blindly
10317                  * without pulling out duplicate stream info. This is
10318                  * inefficent but won't harm the process since the peer will
10319                  * look at these in sequence and will thus release anything.
10320                  * It could mean we exceed the PMTU and chop off some that
10321                  * we could have included.. but this is unlikely (aka 1432/4
10322                  * would mean 300+ stream seq's would have to be reported in
10323                  * one FWD-TSN. With a bit of work we can later FIX this to
10324                  * optimize and pull out duplcates.. but it does add more
10325                  * overhead. So for now... not!
10326                  */
10327                 at = TAILQ_FIRST(&asoc->sent_queue);
10328                 for (i = 0; i < cnt_of_skipped; i++) {
10329                         tp1 = TAILQ_NEXT(at, sctp_next);
10330                         if (tp1 == NULL)
10331                                 break;
10332                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10333                                 /* We don't report these */
10334                                 i--;
10335                                 at = tp1;
10336                                 continue;
10337                         }
10338                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10339                                 at->rec.data.fwd_tsn_cnt = 0;
10340                         }
10341                         strseq->stream = ntohs(at->rec.data.stream_number);
10342                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10343                         strseq++;
10344                         at = tp1;
10345                 }
10346         }
10347         return;
10348 }
10349
10350 void
10351 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10352 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10353     SCTP_UNUSED
10354 #endif
10355 )
10356 {
10357         /*-
10358          * Queue up a SACK or NR-SACK in the control queue.
10359          * We must first check to see if a SACK or NR-SACK is
10360          * somehow on the control queue.
10361          * If so, we will take and and remove the old one.
10362          */
10363         struct sctp_association *asoc;
10364         struct sctp_tmit_chunk *chk, *a_chk;
10365         struct sctp_sack_chunk *sack;
10366         struct sctp_nr_sack_chunk *nr_sack;
10367         struct sctp_gap_ack_block *gap_descriptor;
10368         struct sack_track *selector;
10369         int mergeable = 0;
10370         int offset;
10371         caddr_t limit;
10372         uint32_t *dup;
10373         int limit_reached = 0;
10374         unsigned int i, siz, j;
10375         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10376         int num_dups = 0;
10377         int space_req;
10378         uint32_t highest_tsn;
10379         uint8_t flags;
10380         uint8_t type;
10381         uint8_t tsn_map;
10382
10383         if (stcb->asoc.nrsack_supported == 1) {
10384                 type = SCTP_NR_SELECTIVE_ACK;
10385         } else {
10386                 type = SCTP_SELECTIVE_ACK;
10387         }
10388         a_chk = NULL;
10389         asoc = &stcb->asoc;
10390         SCTP_TCB_LOCK_ASSERT(stcb);
10391         if (asoc->last_data_chunk_from == NULL) {
10392                 /* Hmm we never received anything */
10393                 return;
10394         }
10395         sctp_slide_mapping_arrays(stcb);
10396         sctp_set_rwnd(stcb, asoc);
10397         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10398                 if (chk->rec.chunk_id.id == type) {
10399                         /* Hmm, found a sack already on queue, remove it */
10400                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10401                         asoc->ctrl_queue_cnt--;
10402                         a_chk = chk;
10403                         if (a_chk->data) {
10404                                 sctp_m_freem(a_chk->data);
10405                                 a_chk->data = NULL;
10406                         }
10407                         if (a_chk->whoTo) {
10408                                 sctp_free_remote_addr(a_chk->whoTo);
10409                                 a_chk->whoTo = NULL;
10410                         }
10411                         break;
10412                 }
10413         }
10414         if (a_chk == NULL) {
10415                 sctp_alloc_a_chunk(stcb, a_chk);
10416                 if (a_chk == NULL) {
10417                         /* No memory so we drop the idea, and set a timer */
10418                         if (stcb->asoc.delayed_ack) {
10419                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10420                                     stcb->sctp_ep, stcb, NULL,
10421                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10422                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10423                                     stcb->sctp_ep, stcb, NULL);
10424                         } else {
10425                                 stcb->asoc.send_sack = 1;
10426                         }
10427                         return;
10428                 }
10429                 a_chk->copy_by_ref = 0;
10430                 a_chk->rec.chunk_id.id = type;
10431                 a_chk->rec.chunk_id.can_take_data = 1;
10432         }
10433         /* Clear our pkt counts */
10434         asoc->data_pkts_seen = 0;
10435
10436         a_chk->flags = 0;
10437         a_chk->asoc = asoc;
10438         a_chk->snd_count = 0;
10439         a_chk->send_size = 0;   /* fill in later */
10440         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10441         a_chk->whoTo = NULL;
10442
10443         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10444                 /*-
10445                  * Ok, the destination for the SACK is unreachable, lets see if
10446                  * we can select an alternate to asoc->last_data_chunk_from
10447                  */
10448                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10449                 if (a_chk->whoTo == NULL) {
10450                         /* Nope, no alternate */
10451                         a_chk->whoTo = asoc->last_data_chunk_from;
10452                 }
10453         } else {
10454                 a_chk->whoTo = asoc->last_data_chunk_from;
10455         }
10456         if (a_chk->whoTo) {
10457                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10458         }
10459         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10460                 highest_tsn = asoc->highest_tsn_inside_map;
10461         } else {
10462                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10463         }
10464         if (highest_tsn == asoc->cumulative_tsn) {
10465                 /* no gaps */
10466                 if (type == SCTP_SELECTIVE_ACK) {
10467                         space_req = sizeof(struct sctp_sack_chunk);
10468                 } else {
10469                         space_req = sizeof(struct sctp_nr_sack_chunk);
10470                 }
10471         } else {
10472                 /* gaps get a cluster */
10473                 space_req = MCLBYTES;
10474         }
10475         /* Ok now lets formulate a MBUF with our sack */
10476         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10477         if ((a_chk->data == NULL) ||
10478             (a_chk->whoTo == NULL)) {
10479                 /* rats, no mbuf memory */
10480                 if (a_chk->data) {
10481                         /* was a problem with the destination */
10482                         sctp_m_freem(a_chk->data);
10483                         a_chk->data = NULL;
10484                 }
10485                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10486                 /* sa_ignore NO_NULL_CHK */
10487                 if (stcb->asoc.delayed_ack) {
10488                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10489                             stcb->sctp_ep, stcb, NULL,
10490                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10491                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10492                             stcb->sctp_ep, stcb, NULL);
10493                 } else {
10494                         stcb->asoc.send_sack = 1;
10495                 }
10496                 return;
10497         }
10498         /* ok, lets go through and fill it in */
10499         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10500         space = M_TRAILINGSPACE(a_chk->data);
10501         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10502                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10503         }
10504         limit = mtod(a_chk->data, caddr_t);
10505         limit += space;
10506
10507         flags = 0;
10508
10509         if ((asoc->sctp_cmt_on_off > 0) &&
10510             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10511                 /*-
10512                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10513                  * received, then set high bit to 1, else 0. Reset
10514                  * pkts_rcvd.
10515                  */
10516                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10517                 asoc->cmt_dac_pkts_rcvd = 0;
10518         }
10519 #ifdef SCTP_ASOCLOG_OF_TSNS
10520         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10521         stcb->asoc.cumack_log_atsnt++;
10522         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10523                 stcb->asoc.cumack_log_atsnt = 0;
10524         }
10525 #endif
10526         /* reset the readers interpretation */
10527         stcb->freed_by_sorcv_sincelast = 0;
10528
10529         if (type == SCTP_SELECTIVE_ACK) {
10530                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10531                 nr_sack = NULL;
10532                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10533                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10534                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10535                 } else {
10536                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10537                 }
10538         } else {
10539                 sack = NULL;
10540                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10541                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10542                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10543                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10544                 } else {
10545                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10546                 }
10547         }
10548
10549         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10550                 offset = 1;
10551         } else {
10552                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10553         }
10554         if (((type == SCTP_SELECTIVE_ACK) &&
10555             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10556             ((type == SCTP_NR_SELECTIVE_ACK) &&
10557             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10558                 /* we have a gap .. maybe */
10559                 for (i = 0; i < siz; i++) {
10560                         tsn_map = asoc->mapping_array[i];
10561                         if (type == SCTP_SELECTIVE_ACK) {
10562                                 tsn_map |= asoc->nr_mapping_array[i];
10563                         }
10564                         if (i == 0) {
10565                                 /*
10566                                  * Clear all bits corresponding to TSNs
10567                                  * smaller or equal to the cumulative TSN.
10568                                  */
10569                                 tsn_map &= (~0 << (1 - offset));
10570                         }
10571                         selector = &sack_array[tsn_map];
10572                         if (mergeable && selector->right_edge) {
10573                                 /*
10574                                  * Backup, left and right edges were ok to
10575                                  * merge.
10576                                  */
10577                                 num_gap_blocks--;
10578                                 gap_descriptor--;
10579                         }
10580                         if (selector->num_entries == 0)
10581                                 mergeable = 0;
10582                         else {
10583                                 for (j = 0; j < selector->num_entries; j++) {
10584                                         if (mergeable && selector->right_edge) {
10585                                                 /*
10586                                                  * do a merge by NOT setting
10587                                                  * the left side
10588                                                  */
10589                                                 mergeable = 0;
10590                                         } else {
10591                                                 /*
10592                                                  * no merge, set the left
10593                                                  * side
10594                                                  */
10595                                                 mergeable = 0;
10596                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10597                                         }
10598                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10599                                         num_gap_blocks++;
10600                                         gap_descriptor++;
10601                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10602                                                 /* no more room */
10603                                                 limit_reached = 1;
10604                                                 break;
10605                                         }
10606                                 }
10607                                 if (selector->left_edge) {
10608                                         mergeable = 1;
10609                                 }
10610                         }
10611                         if (limit_reached) {
10612                                 /* Reached the limit stop */
10613                                 break;
10614                         }
10615                         offset += 8;
10616                 }
10617         }
10618         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10619             (limit_reached == 0)) {
10620
10621                 mergeable = 0;
10622
10623                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10624                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10625                 } else {
10626                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10627                 }
10628
10629                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10630                         offset = 1;
10631                 } else {
10632                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10633                 }
10634                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10635                         /* we have a gap .. maybe */
10636                         for (i = 0; i < siz; i++) {
10637                                 tsn_map = asoc->nr_mapping_array[i];
10638                                 if (i == 0) {
10639                                         /*
10640                                          * Clear all bits corresponding to
10641                                          * TSNs smaller or equal to the
10642                                          * cumulative TSN.
10643                                          */
10644                                         tsn_map &= (~0 << (1 - offset));
10645                                 }
10646                                 selector = &sack_array[tsn_map];
10647                                 if (mergeable && selector->right_edge) {
10648                                         /*
10649                                          * Backup, left and right edges were
10650                                          * ok to merge.
10651                                          */
10652                                         num_nr_gap_blocks--;
10653                                         gap_descriptor--;
10654                                 }
10655                                 if (selector->num_entries == 0)
10656                                         mergeable = 0;
10657                                 else {
10658                                         for (j = 0; j < selector->num_entries; j++) {
10659                                                 if (mergeable && selector->right_edge) {
10660                                                         /*
10661                                                          * do a merge by NOT
10662                                                          * setting the left
10663                                                          * side
10664                                                          */
10665                                                         mergeable = 0;
10666                                                 } else {
10667                                                         /*
10668                                                          * no merge, set the
10669                                                          * left side
10670                                                          */
10671                                                         mergeable = 0;
10672                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10673                                                 }
10674                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10675                                                 num_nr_gap_blocks++;
10676                                                 gap_descriptor++;
10677                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10678                                                         /* no more room */
10679                                                         limit_reached = 1;
10680                                                         break;
10681                                                 }
10682                                         }
10683                                         if (selector->left_edge) {
10684                                                 mergeable = 1;
10685                                         }
10686                                 }
10687                                 if (limit_reached) {
10688                                         /* Reached the limit stop */
10689                                         break;
10690                                 }
10691                                 offset += 8;
10692                         }
10693                 }
10694         }
10695         /* now we must add any dups we are going to report. */
10696         if ((limit_reached == 0) && (asoc->numduptsns)) {
10697                 dup = (uint32_t *) gap_descriptor;
10698                 for (i = 0; i < asoc->numduptsns; i++) {
10699                         *dup = htonl(asoc->dup_tsns[i]);
10700                         dup++;
10701                         num_dups++;
10702                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10703                                 /* no more room */
10704                                 break;
10705                         }
10706                 }
10707                 asoc->numduptsns = 0;
10708         }
10709         /*
10710          * now that the chunk is prepared queue it to the control chunk
10711          * queue.
10712          */
10713         if (type == SCTP_SELECTIVE_ACK) {
10714                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10715                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10716                     num_dups * sizeof(int32_t);
10717                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10718                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10719                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10720                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10721                 sack->sack.num_dup_tsns = htons(num_dups);
10722                 sack->ch.chunk_type = type;
10723                 sack->ch.chunk_flags = flags;
10724                 sack->ch.chunk_length = htons(a_chk->send_size);
10725         } else {
10726                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10727                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10728                     num_dups * sizeof(int32_t);
10729                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10730                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10731                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10732                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10733                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10734                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10735                 nr_sack->nr_sack.reserved = 0;
10736                 nr_sack->ch.chunk_type = type;
10737                 nr_sack->ch.chunk_flags = flags;
10738                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10739         }
10740         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10741         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10742         asoc->ctrl_queue_cnt++;
10743         asoc->send_sack = 0;
10744         SCTP_STAT_INCR(sctps_sendsacks);
10745         return;
10746 }
10747
10748 void
10749 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10750 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10751     SCTP_UNUSED
10752 #endif
10753 )
10754 {
10755         struct mbuf *m_abort, *m, *m_last;
10756         struct mbuf *m_out, *m_end = NULL;
10757         struct sctp_abort_chunk *abort;
10758         struct sctp_auth_chunk *auth = NULL;
10759         struct sctp_nets *net;
10760         uint32_t vtag;
10761         uint32_t auth_offset = 0;
10762         uint16_t cause_len, chunk_len, padding_len;
10763
10764         SCTP_TCB_LOCK_ASSERT(stcb);
10765         /*-
10766          * Add an AUTH chunk, if chunk requires it and save the offset into
10767          * the chain for AUTH
10768          */
10769         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10770             stcb->asoc.peer_auth_chunks)) {
10771                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10772                     stcb, SCTP_ABORT_ASSOCIATION);
10773                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10774         } else {
10775                 m_out = NULL;
10776         }
10777         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10778         if (m_abort == NULL) {
10779                 if (m_out) {
10780                         sctp_m_freem(m_out);
10781                 }
10782                 if (operr) {
10783                         sctp_m_freem(operr);
10784                 }
10785                 return;
10786         }
10787         /* link in any error */
10788         SCTP_BUF_NEXT(m_abort) = operr;
10789         cause_len = 0;
10790         m_last = NULL;
10791         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10792                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10793                 if (SCTP_BUF_NEXT(m) == NULL) {
10794                         m_last = m;
10795                 }
10796         }
10797         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10798         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10799         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10800         if (m_out == NULL) {
10801                 /* NO Auth chunk prepended, so reserve space in front */
10802                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10803                 m_out = m_abort;
10804         } else {
10805                 /* Put AUTH chunk at the front of the chain */
10806                 SCTP_BUF_NEXT(m_end) = m_abort;
10807         }
10808         if (stcb->asoc.alternate) {
10809                 net = stcb->asoc.alternate;
10810         } else {
10811                 net = stcb->asoc.primary_destination;
10812         }
10813         /* Fill in the ABORT chunk header. */
10814         abort = mtod(m_abort, struct sctp_abort_chunk *);
10815         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10816         if (stcb->asoc.peer_vtag == 0) {
10817                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10818                 vtag = stcb->asoc.my_vtag;
10819                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10820         } else {
10821                 vtag = stcb->asoc.peer_vtag;
10822                 abort->ch.chunk_flags = 0;
10823         }
10824         abort->ch.chunk_length = htons(chunk_len);
10825         /* Add padding, if necessary. */
10826         if (padding_len > 0) {
10827                 if ((m_last == NULL) ||
10828                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10829                         sctp_m_freem(m_out);
10830                         return;
10831                 }
10832         }
10833         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10834             (struct sockaddr *)&net->ro._l_addr,
10835             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10836             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10837             stcb->asoc.primary_destination->port, NULL,
10838             0, 0,
10839             so_locked);
10840         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10841 }
10842
10843 void
10844 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10845     struct sctp_nets *net,
10846     int reflect_vtag)
10847 {
10848         /* formulate and SEND a SHUTDOWN-COMPLETE */
10849         struct mbuf *m_shutdown_comp;
10850         struct sctp_shutdown_complete_chunk *shutdown_complete;
10851         uint32_t vtag;
10852         uint8_t flags;
10853
10854         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10855         if (m_shutdown_comp == NULL) {
10856                 /* no mbuf's */
10857                 return;
10858         }
10859         if (reflect_vtag) {
10860                 flags = SCTP_HAD_NO_TCB;
10861                 vtag = stcb->asoc.my_vtag;
10862         } else {
10863                 flags = 0;
10864                 vtag = stcb->asoc.peer_vtag;
10865         }
10866         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10867         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10868         shutdown_complete->ch.chunk_flags = flags;
10869         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10870         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10871         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10872             (struct sockaddr *)&net->ro._l_addr,
10873             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10874             stcb->sctp_ep->sctp_lport, stcb->rport,
10875             htonl(vtag),
10876             net->port, NULL,
10877             0, 0,
10878             SCTP_SO_NOT_LOCKED);
10879         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10880         return;
10881 }
10882
10883 static void
10884 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10885     struct sctphdr *sh, uint32_t vtag,
10886     uint8_t type, struct mbuf *cause,
10887     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10888     uint32_t vrf_id, uint16_t port)
10889 {
10890         struct mbuf *o_pak;
10891         struct mbuf *mout;
10892         struct sctphdr *shout;
10893         struct sctp_chunkhdr *ch;
10894
10895 #if defined(INET) || defined(INET6)
10896         struct udphdr *udp;
10897         int ret;
10898
10899 #endif
10900         int len, cause_len, padding_len;
10901
10902 #ifdef INET
10903         struct sockaddr_in *src_sin, *dst_sin;
10904         struct ip *ip;
10905
10906 #endif
10907 #ifdef INET6
10908         struct sockaddr_in6 *src_sin6, *dst_sin6;
10909         struct ip6_hdr *ip6;
10910
10911 #endif
10912
10913         /* Compute the length of the cause and add final padding. */
10914         cause_len = 0;
10915         if (cause != NULL) {
10916                 struct mbuf *m_at, *m_last = NULL;
10917
10918                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10919                         if (SCTP_BUF_NEXT(m_at) == NULL)
10920                                 m_last = m_at;
10921                         cause_len += SCTP_BUF_LEN(m_at);
10922                 }
10923                 padding_len = cause_len % 4;
10924                 if (padding_len != 0) {
10925                         padding_len = 4 - padding_len;
10926                 }
10927                 if (padding_len != 0) {
10928                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10929                                 sctp_m_freem(cause);
10930                                 return;
10931                         }
10932                 }
10933         } else {
10934                 padding_len = 0;
10935         }
10936         /* Get an mbuf for the header. */
10937         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10938         switch (dst->sa_family) {
10939 #ifdef INET
10940         case AF_INET:
10941                 len += sizeof(struct ip);
10942                 break;
10943 #endif
10944 #ifdef INET6
10945         case AF_INET6:
10946                 len += sizeof(struct ip6_hdr);
10947                 break;
10948 #endif
10949         default:
10950                 break;
10951         }
10952 #if defined(INET) || defined(INET6)
10953         if (port) {
10954                 len += sizeof(struct udphdr);
10955         }
10956 #endif
10957         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
10958         if (mout == NULL) {
10959                 if (cause) {
10960                         sctp_m_freem(cause);
10961                 }
10962                 return;
10963         }
10964         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10965         SCTP_BUF_LEN(mout) = len;
10966         SCTP_BUF_NEXT(mout) = cause;
10967         M_SETFIB(mout, fibnum);
10968         mout->m_pkthdr.flowid = mflowid;
10969         M_HASHTYPE_SET(mout, mflowtype);
10970 #ifdef INET
10971         ip = NULL;
10972 #endif
10973 #ifdef INET6
10974         ip6 = NULL;
10975 #endif
10976         switch (dst->sa_family) {
10977 #ifdef INET
10978         case AF_INET:
10979                 src_sin = (struct sockaddr_in *)src;
10980                 dst_sin = (struct sockaddr_in *)dst;
10981                 ip = mtod(mout, struct ip *);
10982                 ip->ip_v = IPVERSION;
10983                 ip->ip_hl = (sizeof(struct ip) >> 2);
10984                 ip->ip_tos = 0;
10985                 ip->ip_off = 0;
10986                 ip_fillid(ip);
10987                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10988                 if (port) {
10989                         ip->ip_p = IPPROTO_UDP;
10990                 } else {
10991                         ip->ip_p = IPPROTO_SCTP;
10992                 }
10993                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10994                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10995                 ip->ip_sum = 0;
10996                 len = sizeof(struct ip);
10997                 shout = (struct sctphdr *)((caddr_t)ip + len);
10998                 break;
10999 #endif
11000 #ifdef INET6
11001         case AF_INET6:
11002                 src_sin6 = (struct sockaddr_in6 *)src;
11003                 dst_sin6 = (struct sockaddr_in6 *)dst;
11004                 ip6 = mtod(mout, struct ip6_hdr *);
11005                 ip6->ip6_flow = htonl(0x60000000);
11006                 if (V_ip6_auto_flowlabel) {
11007                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11008                 }
11009                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11010                 if (port) {
11011                         ip6->ip6_nxt = IPPROTO_UDP;
11012                 } else {
11013                         ip6->ip6_nxt = IPPROTO_SCTP;
11014                 }
11015                 ip6->ip6_src = dst_sin6->sin6_addr;
11016                 ip6->ip6_dst = src_sin6->sin6_addr;
11017                 len = sizeof(struct ip6_hdr);
11018                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11019                 break;
11020 #endif
11021         default:
11022                 len = 0;
11023                 shout = mtod(mout, struct sctphdr *);
11024                 break;
11025         }
11026 #if defined(INET) || defined(INET6)
11027         if (port) {
11028                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11029                         sctp_m_freem(mout);
11030                         return;
11031                 }
11032                 udp = (struct udphdr *)shout;
11033                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11034                 udp->uh_dport = port;
11035                 udp->uh_sum = 0;
11036                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11037                     sizeof(struct sctphdr) +
11038                     sizeof(struct sctp_chunkhdr) +
11039                     cause_len + padding_len);
11040                 len += sizeof(struct udphdr);
11041                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11042         } else {
11043                 udp = NULL;
11044         }
11045 #endif
11046         shout->src_port = sh->dest_port;
11047         shout->dest_port = sh->src_port;
11048         shout->checksum = 0;
11049         if (vtag) {
11050                 shout->v_tag = htonl(vtag);
11051         } else {
11052                 shout->v_tag = sh->v_tag;
11053         }
11054         len += sizeof(struct sctphdr);
11055         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11056         ch->chunk_type = type;
11057         if (vtag) {
11058                 ch->chunk_flags = 0;
11059         } else {
11060                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11061         }
11062         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11063         len += sizeof(struct sctp_chunkhdr);
11064         len += cause_len + padding_len;
11065
11066         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11067                 sctp_m_freem(mout);
11068                 return;
11069         }
11070         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11071         switch (dst->sa_family) {
11072 #ifdef INET
11073         case AF_INET:
11074                 if (port) {
11075                         if (V_udp_cksum) {
11076                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11077                         } else {
11078                                 udp->uh_sum = 0;
11079                         }
11080                 }
11081                 ip->ip_len = htons(len);
11082                 if (port) {
11083 #if defined(SCTP_WITH_NO_CSUM)
11084                         SCTP_STAT_INCR(sctps_sendnocrc);
11085 #else
11086                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11087                         SCTP_STAT_INCR(sctps_sendswcrc);
11088 #endif
11089                         if (V_udp_cksum) {
11090                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11091                         }
11092                 } else {
11093 #if defined(SCTP_WITH_NO_CSUM)
11094                         SCTP_STAT_INCR(sctps_sendnocrc);
11095 #else
11096                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11097                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11098                         SCTP_STAT_INCR(sctps_sendhwcrc);
11099 #endif
11100                 }
11101 #ifdef SCTP_PACKET_LOGGING
11102                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11103                         sctp_packet_log(o_pak);
11104                 }
11105 #endif
11106                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11107                 break;
11108 #endif
11109 #ifdef INET6
11110         case AF_INET6:
11111                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11112                 if (port) {
11113 #if defined(SCTP_WITH_NO_CSUM)
11114                         SCTP_STAT_INCR(sctps_sendnocrc);
11115 #else
11116                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11117                         SCTP_STAT_INCR(sctps_sendswcrc);
11118 #endif
11119                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11120                                 udp->uh_sum = 0xffff;
11121                         }
11122                 } else {
11123 #if defined(SCTP_WITH_NO_CSUM)
11124                         SCTP_STAT_INCR(sctps_sendnocrc);
11125 #else
11126                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11127                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11128                         SCTP_STAT_INCR(sctps_sendhwcrc);
11129 #endif
11130                 }
11131 #ifdef SCTP_PACKET_LOGGING
11132                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11133                         sctp_packet_log(o_pak);
11134                 }
11135 #endif
11136                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11137                 break;
11138 #endif
11139         default:
11140                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11141                     dst->sa_family);
11142                 sctp_m_freem(mout);
11143                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11144                 return;
11145         }
11146         SCTP_STAT_INCR(sctps_sendpackets);
11147         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11148         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11149         return;
11150 }
11151
11152 void
11153 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11154     struct sctphdr *sh,
11155     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11156     uint32_t vrf_id, uint16_t port)
11157 {
11158         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11159             mflowtype, mflowid, fibnum,
11160             vrf_id, port);
11161 }
11162
11163 void
11164 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11165 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11166     SCTP_UNUSED
11167 #endif
11168 )
11169 {
11170         struct sctp_tmit_chunk *chk;
11171         struct sctp_heartbeat_chunk *hb;
11172         struct timeval now;
11173
11174         SCTP_TCB_LOCK_ASSERT(stcb);
11175         if (net == NULL) {
11176                 return;
11177         }
11178         (void)SCTP_GETTIME_TIMEVAL(&now);
11179         switch (net->ro._l_addr.sa.sa_family) {
11180 #ifdef INET
11181         case AF_INET:
11182                 break;
11183 #endif
11184 #ifdef INET6
11185         case AF_INET6:
11186                 break;
11187 #endif
11188         default:
11189                 return;
11190         }
11191         sctp_alloc_a_chunk(stcb, chk);
11192         if (chk == NULL) {
11193                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11194                 return;
11195         }
11196         chk->copy_by_ref = 0;
11197         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11198         chk->rec.chunk_id.can_take_data = 1;
11199         chk->flags = 0;
11200         chk->asoc = &stcb->asoc;
11201         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11202
11203         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11204         if (chk->data == NULL) {
11205                 sctp_free_a_chunk(stcb, chk, so_locked);
11206                 return;
11207         }
11208         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11209         SCTP_BUF_LEN(chk->data) = chk->send_size;
11210         chk->sent = SCTP_DATAGRAM_UNSENT;
11211         chk->snd_count = 0;
11212         chk->whoTo = net;
11213         atomic_add_int(&chk->whoTo->ref_count, 1);
11214         /* Now we have a mbuf that we can fill in with the details */
11215         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11216         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11217         /* fill out chunk header */
11218         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11219         hb->ch.chunk_flags = 0;
11220         hb->ch.chunk_length = htons(chk->send_size);
11221         /* Fill out hb parameter */
11222         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11223         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11224         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11225         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11226         /* Did our user request this one, put it in */
11227         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11228         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11229         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11230                 /*
11231                  * we only take from the entropy pool if the address is not
11232                  * confirmed.
11233                  */
11234                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11235                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11236         } else {
11237                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11238                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11239         }
11240         switch (net->ro._l_addr.sa.sa_family) {
11241 #ifdef INET
11242         case AF_INET:
11243                 memcpy(hb->heartbeat.hb_info.address,
11244                     &net->ro._l_addr.sin.sin_addr,
11245                     sizeof(net->ro._l_addr.sin.sin_addr));
11246                 break;
11247 #endif
11248 #ifdef INET6
11249         case AF_INET6:
11250                 memcpy(hb->heartbeat.hb_info.address,
11251                     &net->ro._l_addr.sin6.sin6_addr,
11252                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11253                 break;
11254 #endif
11255         default:
11256                 if (chk->data) {
11257                         sctp_m_freem(chk->data);
11258                         chk->data = NULL;
11259                 }
11260                 sctp_free_a_chunk(stcb, chk, so_locked);
11261                 return;
11262                 break;
11263         }
11264         net->hb_responded = 0;
11265         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11266         stcb->asoc.ctrl_queue_cnt++;
11267         SCTP_STAT_INCR(sctps_sendheartbeat);
11268         return;
11269 }
11270
11271 void
11272 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11273     uint32_t high_tsn)
11274 {
11275         struct sctp_association *asoc;
11276         struct sctp_ecne_chunk *ecne;
11277         struct sctp_tmit_chunk *chk;
11278
11279         if (net == NULL) {
11280                 return;
11281         }
11282         asoc = &stcb->asoc;
11283         SCTP_TCB_LOCK_ASSERT(stcb);
11284         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11285                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11286                         /* found a previous ECN_ECHO update it if needed */
11287                         uint32_t cnt, ctsn;
11288
11289                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11290                         ctsn = ntohl(ecne->tsn);
11291                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11292                                 ecne->tsn = htonl(high_tsn);
11293                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11294                         }
11295                         cnt = ntohl(ecne->num_pkts_since_cwr);
11296                         cnt++;
11297                         ecne->num_pkts_since_cwr = htonl(cnt);
11298                         return;
11299                 }
11300         }
11301         /* nope could not find one to update so we must build one */
11302         sctp_alloc_a_chunk(stcb, chk);
11303         if (chk == NULL) {
11304                 return;
11305         }
11306         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11307         chk->copy_by_ref = 0;
11308         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11309         chk->rec.chunk_id.can_take_data = 0;
11310         chk->flags = 0;
11311         chk->asoc = &stcb->asoc;
11312         chk->send_size = sizeof(struct sctp_ecne_chunk);
11313         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11314         if (chk->data == NULL) {
11315                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11316                 return;
11317         }
11318         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11319         SCTP_BUF_LEN(chk->data) = chk->send_size;
11320         chk->sent = SCTP_DATAGRAM_UNSENT;
11321         chk->snd_count = 0;
11322         chk->whoTo = net;
11323         atomic_add_int(&chk->whoTo->ref_count, 1);
11324
11325         stcb->asoc.ecn_echo_cnt_onq++;
11326         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11327         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11328         ecne->ch.chunk_flags = 0;
11329         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11330         ecne->tsn = htonl(high_tsn);
11331         ecne->num_pkts_since_cwr = htonl(1);
11332         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11333         asoc->ctrl_queue_cnt++;
11334 }
11335
11336 void
11337 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11338     struct mbuf *m, int len, int iphlen, int bad_crc)
11339 {
11340         struct sctp_association *asoc;
11341         struct sctp_pktdrop_chunk *drp;
11342         struct sctp_tmit_chunk *chk;
11343         uint8_t *datap;
11344         int was_trunc = 0;
11345         int fullsz = 0;
11346         long spc;
11347         int offset;
11348         struct sctp_chunkhdr *ch, chunk_buf;
11349         unsigned int chk_length;
11350
11351         if (!stcb) {
11352                 return;
11353         }
11354         asoc = &stcb->asoc;
11355         SCTP_TCB_LOCK_ASSERT(stcb);
11356         if (asoc->pktdrop_supported == 0) {
11357                 /*-
11358                  * peer must declare support before I send one.
11359                  */
11360                 return;
11361         }
11362         if (stcb->sctp_socket == NULL) {
11363                 return;
11364         }
11365         sctp_alloc_a_chunk(stcb, chk);
11366         if (chk == NULL) {
11367                 return;
11368         }
11369         chk->copy_by_ref = 0;
11370         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11371         chk->rec.chunk_id.can_take_data = 1;
11372         chk->flags = 0;
11373         len -= iphlen;
11374         chk->send_size = len;
11375         /* Validate that we do not have an ABORT in here. */
11376         offset = iphlen + sizeof(struct sctphdr);
11377         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11378             sizeof(*ch), (uint8_t *) & chunk_buf);
11379         while (ch != NULL) {
11380                 chk_length = ntohs(ch->chunk_length);
11381                 if (chk_length < sizeof(*ch)) {
11382                         /* break to abort land */
11383                         break;
11384                 }
11385                 switch (ch->chunk_type) {
11386                 case SCTP_PACKET_DROPPED:
11387                 case SCTP_ABORT_ASSOCIATION:
11388                 case SCTP_INITIATION_ACK:
11389                         /**
11390                          * We don't respond with an PKT-DROP to an ABORT
11391                          * or PKT-DROP. We also do not respond to an
11392                          * INIT-ACK, because we can't know if the initiation
11393                          * tag is correct or not.
11394                          */
11395                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11396                         return;
11397                 default:
11398                         break;
11399                 }
11400                 offset += SCTP_SIZE32(chk_length);
11401                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11402                     sizeof(*ch), (uint8_t *) & chunk_buf);
11403         }
11404
11405         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11406             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11407                 /*
11408                  * only send 1 mtu worth, trim off the excess on the end.
11409                  */
11410                 fullsz = len;
11411                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11412                 was_trunc = 1;
11413         }
11414         chk->asoc = &stcb->asoc;
11415         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11416         if (chk->data == NULL) {
11417 jump_out:
11418                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11419                 return;
11420         }
11421         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11422         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11423         if (drp == NULL) {
11424                 sctp_m_freem(chk->data);
11425                 chk->data = NULL;
11426                 goto jump_out;
11427         }
11428         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11429             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11430         chk->book_size_scale = 0;
11431         if (was_trunc) {
11432                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11433                 drp->trunc_len = htons(fullsz);
11434                 /*
11435                  * Len is already adjusted to size minus overhead above take
11436                  * out the pkt_drop chunk itself from it.
11437                  */
11438                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11439                 len = chk->send_size;
11440         } else {
11441                 /* no truncation needed */
11442                 drp->ch.chunk_flags = 0;
11443                 drp->trunc_len = htons(0);
11444         }
11445         if (bad_crc) {
11446                 drp->ch.chunk_flags |= SCTP_BADCRC;
11447         }
11448         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11449         SCTP_BUF_LEN(chk->data) = chk->send_size;
11450         chk->sent = SCTP_DATAGRAM_UNSENT;
11451         chk->snd_count = 0;
11452         if (net) {
11453                 /* we should hit here */
11454                 chk->whoTo = net;
11455                 atomic_add_int(&chk->whoTo->ref_count, 1);
11456         } else {
11457                 chk->whoTo = NULL;
11458         }
11459         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11460         drp->ch.chunk_length = htons(chk->send_size);
11461         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11462         if (spc < 0) {
11463                 spc = 0;
11464         }
11465         drp->bottle_bw = htonl(spc);
11466         if (asoc->my_rwnd) {
11467                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11468                     asoc->size_on_all_streams +
11469                     asoc->my_rwnd_control_len +
11470                     stcb->sctp_socket->so_rcv.sb_cc);
11471         } else {
11472                 /*-
11473                  * If my rwnd is 0, possibly from mbuf depletion as well as
11474                  * space used, tell the peer there is NO space aka onq == bw
11475                  */
11476                 drp->current_onq = htonl(spc);
11477         }
11478         drp->reserved = 0;
11479         datap = drp->data;
11480         m_copydata(m, iphlen, len, (caddr_t)datap);
11481         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11482         asoc->ctrl_queue_cnt++;
11483 }
11484
11485 void
11486 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11487 {
11488         struct sctp_association *asoc;
11489         struct sctp_cwr_chunk *cwr;
11490         struct sctp_tmit_chunk *chk;
11491
11492         SCTP_TCB_LOCK_ASSERT(stcb);
11493         if (net == NULL) {
11494                 return;
11495         }
11496         asoc = &stcb->asoc;
11497         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11498                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11499                         /*
11500                          * found a previous CWR queued to same destination
11501                          * update it if needed
11502                          */
11503                         uint32_t ctsn;
11504
11505                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11506                         ctsn = ntohl(cwr->tsn);
11507                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11508                                 cwr->tsn = htonl(high_tsn);
11509                         }
11510                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11511                                 /* Make sure override is carried */
11512                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11513                         }
11514                         return;
11515                 }
11516         }
11517         sctp_alloc_a_chunk(stcb, chk);
11518         if (chk == NULL) {
11519                 return;
11520         }
11521         chk->copy_by_ref = 0;
11522         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11523         chk->rec.chunk_id.can_take_data = 1;
11524         chk->flags = 0;
11525         chk->asoc = &stcb->asoc;
11526         chk->send_size = sizeof(struct sctp_cwr_chunk);
11527         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11528         if (chk->data == NULL) {
11529                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11530                 return;
11531         }
11532         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11533         SCTP_BUF_LEN(chk->data) = chk->send_size;
11534         chk->sent = SCTP_DATAGRAM_UNSENT;
11535         chk->snd_count = 0;
11536         chk->whoTo = net;
11537         atomic_add_int(&chk->whoTo->ref_count, 1);
11538         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11539         cwr->ch.chunk_type = SCTP_ECN_CWR;
11540         cwr->ch.chunk_flags = override;
11541         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11542         cwr->tsn = htonl(high_tsn);
11543         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11544         asoc->ctrl_queue_cnt++;
11545 }
11546
11547 static int
11548 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11549     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11550 {
11551         uint16_t len, old_len, i;
11552         struct sctp_stream_reset_out_request *req_out;
11553         struct sctp_chunkhdr *ch;
11554         int at;
11555         int number_entries = 0;
11556
11557         ch = mtod(chk->data, struct sctp_chunkhdr *);
11558         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11559         /* get to new offset for the param. */
11560         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11561         /* now how long will this param be? */
11562         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11563                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11564                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11565                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11566                         number_entries++;
11567                 }
11568         }
11569         if (number_entries == 0) {
11570                 return (0);
11571         }
11572         if (number_entries == stcb->asoc.streamoutcnt) {
11573                 number_entries = 0;
11574         }
11575         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11576                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11577         }
11578         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11579         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11580         req_out->ph.param_length = htons(len);
11581         req_out->request_seq = htonl(seq);
11582         req_out->response_seq = htonl(resp_seq);
11583         req_out->send_reset_at_tsn = htonl(last_sent);
11584         at = 0;
11585         if (number_entries) {
11586                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11587                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11588                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11589                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11590                                 req_out->list_of_streams[at] = htons(i);
11591                                 at++;
11592                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11593                                 if (at >= number_entries) {
11594                                         break;
11595                                 }
11596                         }
11597                 }
11598         } else {
11599                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11600                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11601                 }
11602         }
11603         if (SCTP_SIZE32(len) > len) {
11604                 /*-
11605                  * Need to worry about the pad we may end up adding to the
11606                  * end. This is easy since the struct is either aligned to 4
11607                  * bytes or 2 bytes off.
11608                  */
11609                 req_out->list_of_streams[number_entries] = 0;
11610         }
11611         /* now fix the chunk length */
11612         ch->chunk_length = htons(len + old_len);
11613         chk->book_size = len + old_len;
11614         chk->book_size_scale = 0;
11615         chk->send_size = SCTP_SIZE32(chk->book_size);
11616         SCTP_BUF_LEN(chk->data) = chk->send_size;
11617         return (1);
11618 }
11619
11620 static void
11621 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11622     int number_entries, uint16_t * list,
11623     uint32_t seq)
11624 {
11625         uint16_t len, old_len, i;
11626         struct sctp_stream_reset_in_request *req_in;
11627         struct sctp_chunkhdr *ch;
11628
11629         ch = mtod(chk->data, struct sctp_chunkhdr *);
11630         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11631
11632         /* get to new offset for the param. */
11633         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11634         /* now how long will this param be? */
11635         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11636         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11637         req_in->ph.param_length = htons(len);
11638         req_in->request_seq = htonl(seq);
11639         if (number_entries) {
11640                 for (i = 0; i < number_entries; i++) {
11641                         req_in->list_of_streams[i] = htons(list[i]);
11642                 }
11643         }
11644         if (SCTP_SIZE32(len) > len) {
11645                 /*-
11646                  * Need to worry about the pad we may end up adding to the
11647                  * end. This is easy since the struct is either aligned to 4
11648                  * bytes or 2 bytes off.
11649                  */
11650                 req_in->list_of_streams[number_entries] = 0;
11651         }
11652         /* now fix the chunk length */
11653         ch->chunk_length = htons(len + old_len);
11654         chk->book_size = len + old_len;
11655         chk->book_size_scale = 0;
11656         chk->send_size = SCTP_SIZE32(chk->book_size);
11657         SCTP_BUF_LEN(chk->data) = chk->send_size;
11658         return;
11659 }
11660
11661 static void
11662 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11663     uint32_t seq)
11664 {
11665         uint16_t len, old_len;
11666         struct sctp_stream_reset_tsn_request *req_tsn;
11667         struct sctp_chunkhdr *ch;
11668
11669         ch = mtod(chk->data, struct sctp_chunkhdr *);
11670         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11671
11672         /* get to new offset for the param. */
11673         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11674         /* now how long will this param be? */
11675         len = sizeof(struct sctp_stream_reset_tsn_request);
11676         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11677         req_tsn->ph.param_length = htons(len);
11678         req_tsn->request_seq = htonl(seq);
11679
11680         /* now fix the chunk length */
11681         ch->chunk_length = htons(len + old_len);
11682         chk->send_size = len + old_len;
11683         chk->book_size = SCTP_SIZE32(chk->send_size);
11684         chk->book_size_scale = 0;
11685         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11686         return;
11687 }
11688
11689 void
11690 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11691     uint32_t resp_seq, uint32_t result)
11692 {
11693         uint16_t len, old_len;
11694         struct sctp_stream_reset_response *resp;
11695         struct sctp_chunkhdr *ch;
11696
11697         ch = mtod(chk->data, struct sctp_chunkhdr *);
11698         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11699
11700         /* get to new offset for the param. */
11701         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11702         /* now how long will this param be? */
11703         len = sizeof(struct sctp_stream_reset_response);
11704         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11705         resp->ph.param_length = htons(len);
11706         resp->response_seq = htonl(resp_seq);
11707         resp->result = ntohl(result);
11708
11709         /* now fix the chunk length */
11710         ch->chunk_length = htons(len + old_len);
11711         chk->book_size = len + old_len;
11712         chk->book_size_scale = 0;
11713         chk->send_size = SCTP_SIZE32(chk->book_size);
11714         SCTP_BUF_LEN(chk->data) = chk->send_size;
11715         return;
11716 }
11717
11718 void
11719 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11720     struct sctp_stream_reset_list *ent,
11721     int response)
11722 {
11723         struct sctp_association *asoc;
11724         struct sctp_tmit_chunk *chk;
11725         struct sctp_chunkhdr *ch;
11726
11727         asoc = &stcb->asoc;
11728
11729         /*
11730          * Reset our last reset action to the new one IP -> response
11731          * (PERFORMED probably). This assures that if we fail to send, a
11732          * retran from the peer will get the new response.
11733          */
11734         asoc->last_reset_action[0] = response;
11735         if (asoc->stream_reset_outstanding) {
11736                 return;
11737         }
11738         sctp_alloc_a_chunk(stcb, chk);
11739         if (chk == NULL) {
11740                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11741                 return;
11742         }
11743         chk->copy_by_ref = 0;
11744         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11745         chk->rec.chunk_id.can_take_data = 0;
11746         chk->flags = 0;
11747         chk->asoc = &stcb->asoc;
11748         chk->book_size = sizeof(struct sctp_chunkhdr);
11749         chk->send_size = SCTP_SIZE32(chk->book_size);
11750         chk->book_size_scale = 0;
11751         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11752         if (chk->data == NULL) {
11753                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11754                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11755                 return;
11756         }
11757         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11758         sctp_add_stream_reset_result(chk, ent->seq, response);
11759         /* setup chunk parameters */
11760         chk->sent = SCTP_DATAGRAM_UNSENT;
11761         chk->snd_count = 0;
11762         if (stcb->asoc.alternate) {
11763                 chk->whoTo = stcb->asoc.alternate;
11764         } else {
11765                 chk->whoTo = stcb->asoc.primary_destination;
11766         }
11767         ch = mtod(chk->data, struct sctp_chunkhdr *);
11768         ch->chunk_type = SCTP_STREAM_RESET;
11769         ch->chunk_flags = 0;
11770         ch->chunk_length = htons(chk->book_size);
11771         atomic_add_int(&chk->whoTo->ref_count, 1);
11772         SCTP_BUF_LEN(chk->data) = chk->send_size;
11773         /* insert the chunk for sending */
11774         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11775             chk,
11776             sctp_next);
11777         asoc->ctrl_queue_cnt++;
11778 }
11779
11780 void
11781 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11782     uint32_t resp_seq, uint32_t result,
11783     uint32_t send_una, uint32_t recv_next)
11784 {
11785         uint16_t len, old_len;
11786         struct sctp_stream_reset_response_tsn *resp;
11787         struct sctp_chunkhdr *ch;
11788
11789         ch = mtod(chk->data, struct sctp_chunkhdr *);
11790         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11791
11792         /* get to new offset for the param. */
11793         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11794         /* now how long will this param be? */
11795         len = sizeof(struct sctp_stream_reset_response_tsn);
11796         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11797         resp->ph.param_length = htons(len);
11798         resp->response_seq = htonl(resp_seq);
11799         resp->result = htonl(result);
11800         resp->senders_next_tsn = htonl(send_una);
11801         resp->receivers_next_tsn = htonl(recv_next);
11802
11803         /* now fix the chunk length */
11804         ch->chunk_length = htons(len + old_len);
11805         chk->book_size = len + old_len;
11806         chk->send_size = SCTP_SIZE32(chk->book_size);
11807         chk->book_size_scale = 0;
11808         SCTP_BUF_LEN(chk->data) = chk->send_size;
11809         return;
11810 }
11811
11812 static void
11813 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11814     uint32_t seq,
11815     uint16_t adding)
11816 {
11817         uint16_t len, old_len;
11818         struct sctp_chunkhdr *ch;
11819         struct sctp_stream_reset_add_strm *addstr;
11820
11821         ch = mtod(chk->data, struct sctp_chunkhdr *);
11822         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11823
11824         /* get to new offset for the param. */
11825         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11826         /* now how long will this param be? */
11827         len = sizeof(struct sctp_stream_reset_add_strm);
11828
11829         /* Fill it out. */
11830         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11831         addstr->ph.param_length = htons(len);
11832         addstr->request_seq = htonl(seq);
11833         addstr->number_of_streams = htons(adding);
11834         addstr->reserved = 0;
11835
11836         /* now fix the chunk length */
11837         ch->chunk_length = htons(len + old_len);
11838         chk->send_size = len + old_len;
11839         chk->book_size = SCTP_SIZE32(chk->send_size);
11840         chk->book_size_scale = 0;
11841         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11842         return;
11843 }
11844
11845 static void
11846 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11847     uint32_t seq,
11848     uint16_t adding)
11849 {
11850         uint16_t len, old_len;
11851         struct sctp_chunkhdr *ch;
11852         struct sctp_stream_reset_add_strm *addstr;
11853
11854         ch = mtod(chk->data, struct sctp_chunkhdr *);
11855         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11856
11857         /* get to new offset for the param. */
11858         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11859         /* now how long will this param be? */
11860         len = sizeof(struct sctp_stream_reset_add_strm);
11861         /* Fill it out. */
11862         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11863         addstr->ph.param_length = htons(len);
11864         addstr->request_seq = htonl(seq);
11865         addstr->number_of_streams = htons(adding);
11866         addstr->reserved = 0;
11867
11868         /* now fix the chunk length */
11869         ch->chunk_length = htons(len + old_len);
11870         chk->send_size = len + old_len;
11871         chk->book_size = SCTP_SIZE32(chk->send_size);
11872         chk->book_size_scale = 0;
11873         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11874         return;
11875 }
11876
11877 int
11878 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11879 {
11880         struct sctp_association *asoc;
11881         struct sctp_tmit_chunk *chk;
11882         struct sctp_chunkhdr *ch;
11883         uint32_t seq;
11884
11885         asoc = &stcb->asoc;
11886         asoc->trigger_reset = 0;
11887         if (asoc->stream_reset_outstanding) {
11888                 return (EALREADY);
11889         }
11890         sctp_alloc_a_chunk(stcb, chk);
11891         if (chk == NULL) {
11892                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11893                 return (ENOMEM);
11894         }
11895         chk->copy_by_ref = 0;
11896         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11897         chk->rec.chunk_id.can_take_data = 0;
11898         chk->flags = 0;
11899         chk->asoc = &stcb->asoc;
11900         chk->book_size = sizeof(struct sctp_chunkhdr);
11901         chk->send_size = SCTP_SIZE32(chk->book_size);
11902         chk->book_size_scale = 0;
11903         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11904         if (chk->data == NULL) {
11905                 sctp_free_a_chunk(stcb, chk, so_locked);
11906                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11907                 return (ENOMEM);
11908         }
11909         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11910
11911         /* setup chunk parameters */
11912         chk->sent = SCTP_DATAGRAM_UNSENT;
11913         chk->snd_count = 0;
11914         if (stcb->asoc.alternate) {
11915                 chk->whoTo = stcb->asoc.alternate;
11916         } else {
11917                 chk->whoTo = stcb->asoc.primary_destination;
11918         }
11919         ch = mtod(chk->data, struct sctp_chunkhdr *);
11920         ch->chunk_type = SCTP_STREAM_RESET;
11921         ch->chunk_flags = 0;
11922         ch->chunk_length = htons(chk->book_size);
11923         atomic_add_int(&chk->whoTo->ref_count, 1);
11924         SCTP_BUF_LEN(chk->data) = chk->send_size;
11925         seq = stcb->asoc.str_reset_seq_out;
11926         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11927                 seq++;
11928                 asoc->stream_reset_outstanding++;
11929         } else {
11930                 m_freem(chk->data);
11931                 chk->data = NULL;
11932                 sctp_free_a_chunk(stcb, chk, so_locked);
11933                 return (ENOENT);
11934         }
11935         asoc->str_reset = chk;
11936         /* insert the chunk for sending */
11937         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11938             chk,
11939             sctp_next);
11940         asoc->ctrl_queue_cnt++;
11941
11942         if (stcb->asoc.send_sack) {
11943                 sctp_send_sack(stcb, so_locked);
11944         }
11945         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11946         return (0);
11947 }
11948
11949 int
11950 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11951     uint16_t number_entries, uint16_t * list,
11952     uint8_t send_in_req,
11953     uint8_t send_tsn_req,
11954     uint8_t add_stream,
11955     uint16_t adding_o,
11956     uint16_t adding_i, uint8_t peer_asked)
11957 {
11958         struct sctp_association *asoc;
11959         struct sctp_tmit_chunk *chk;
11960         struct sctp_chunkhdr *ch;
11961         int can_send_out_req = 0;
11962         uint32_t seq;
11963
11964         asoc = &stcb->asoc;
11965         if (asoc->stream_reset_outstanding) {
11966                 /*-
11967                  * Already one pending, must get ACK back to clear the flag.
11968                  */
11969                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11970                 return (EBUSY);
11971         }
11972         if ((send_in_req == 0) && (send_tsn_req == 0) &&
11973             (add_stream == 0)) {
11974                 /* nothing to do */
11975                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11976                 return (EINVAL);
11977         }
11978         if (send_tsn_req && send_in_req) {
11979                 /* error, can't do that */
11980                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11981                 return (EINVAL);
11982         } else if (send_in_req) {
11983                 can_send_out_req = 1;
11984         }
11985         if (number_entries > (MCLBYTES -
11986             SCTP_MIN_OVERHEAD -
11987             sizeof(struct sctp_chunkhdr) -
11988             sizeof(struct sctp_stream_reset_out_request)) /
11989             sizeof(uint16_t)) {
11990                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11991                 return (ENOMEM);
11992         }
11993         sctp_alloc_a_chunk(stcb, chk);
11994         if (chk == NULL) {
11995                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11996                 return (ENOMEM);
11997         }
11998         chk->copy_by_ref = 0;
11999         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12000         chk->rec.chunk_id.can_take_data = 0;
12001         chk->flags = 0;
12002         chk->asoc = &stcb->asoc;
12003         chk->book_size = sizeof(struct sctp_chunkhdr);
12004         chk->send_size = SCTP_SIZE32(chk->book_size);
12005         chk->book_size_scale = 0;
12006
12007         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12008         if (chk->data == NULL) {
12009                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12010                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12011                 return (ENOMEM);
12012         }
12013         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12014
12015         /* setup chunk parameters */
12016         chk->sent = SCTP_DATAGRAM_UNSENT;
12017         chk->snd_count = 0;
12018         if (stcb->asoc.alternate) {
12019                 chk->whoTo = stcb->asoc.alternate;
12020         } else {
12021                 chk->whoTo = stcb->asoc.primary_destination;
12022         }
12023         atomic_add_int(&chk->whoTo->ref_count, 1);
12024         ch = mtod(chk->data, struct sctp_chunkhdr *);
12025         ch->chunk_type = SCTP_STREAM_RESET;
12026         ch->chunk_flags = 0;
12027         ch->chunk_length = htons(chk->book_size);
12028         SCTP_BUF_LEN(chk->data) = chk->send_size;
12029
12030         seq = stcb->asoc.str_reset_seq_out;
12031         if (can_send_out_req) {
12032                 int ret;
12033
12034                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12035                 if (ret) {
12036                         seq++;
12037                         asoc->stream_reset_outstanding++;
12038                 }
12039         }
12040         if ((add_stream & 1) &&
12041             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12042                 /* Need to allocate more */
12043                 struct sctp_stream_out *oldstream;
12044                 struct sctp_stream_queue_pending *sp, *nsp;
12045                 int i;
12046
12047 #if defined(SCTP_DETAILED_STR_STATS)
12048                 int j;
12049
12050 #endif
12051
12052                 oldstream = stcb->asoc.strmout;
12053                 /* get some more */
12054                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12055                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12056                     SCTP_M_STRMO);
12057                 if (stcb->asoc.strmout == NULL) {
12058                         uint8_t x;
12059
12060                         stcb->asoc.strmout = oldstream;
12061                         /* Turn off the bit */
12062                         x = add_stream & 0xfe;
12063                         add_stream = x;
12064                         goto skip_stuff;
12065                 }
12066                 /*
12067                  * Ok now we proceed with copying the old out stuff and
12068                  * initializing the new stuff.
12069                  */
12070                 SCTP_TCB_SEND_LOCK(stcb);
12071                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12072                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12073                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12074                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12075                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
12076                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12077                         stcb->asoc.strmout[i].stream_no = i;
12078                         stcb->asoc.strmout[i].state = oldstream[i].state;
12079                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
12080                         /* now anything on those queues? */
12081                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12082                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12083                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12084                         }
12085                         /* Now move assoc pointers too */
12086                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
12087                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
12088                         }
12089                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
12090                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
12091                         }
12092                 }
12093                 /* now the new streams */
12094                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12095                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12096                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12097                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12098 #if defined(SCTP_DETAILED_STR_STATS)
12099                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12100                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12101                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12102                         }
12103 #else
12104                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12105                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12106 #endif
12107                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
12108                         stcb->asoc.strmout[i].stream_no = i;
12109                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12110                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12111                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12112                 }
12113                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12114                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12115                 SCTP_TCB_SEND_UNLOCK(stcb);
12116         }
12117 skip_stuff:
12118         if ((add_stream & 1) && (adding_o > 0)) {
12119                 asoc->strm_pending_add_size = adding_o;
12120                 asoc->peer_req_out = peer_asked;
12121                 sctp_add_an_out_stream(chk, seq, adding_o);
12122                 seq++;
12123                 asoc->stream_reset_outstanding++;
12124         }
12125         if ((add_stream & 2) && (adding_i > 0)) {
12126                 sctp_add_an_in_stream(chk, seq, adding_i);
12127                 seq++;
12128                 asoc->stream_reset_outstanding++;
12129         }
12130         if (send_in_req) {
12131                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12132                 seq++;
12133                 asoc->stream_reset_outstanding++;
12134         }
12135         if (send_tsn_req) {
12136                 sctp_add_stream_reset_tsn(chk, seq);
12137                 asoc->stream_reset_outstanding++;
12138         }
12139         asoc->str_reset = chk;
12140         /* insert the chunk for sending */
12141         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12142             chk,
12143             sctp_next);
12144         asoc->ctrl_queue_cnt++;
12145         if (stcb->asoc.send_sack) {
12146                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12147         }
12148         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12149         return (0);
12150 }
12151
12152 void
12153 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12154     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12155     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12156     uint32_t vrf_id, uint16_t port)
12157 {
12158         /* Don't respond to an ABORT with an ABORT. */
12159         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12160                 if (cause)
12161                         sctp_m_freem(cause);
12162                 return;
12163         }
12164         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12165             mflowtype, mflowid, fibnum,
12166             vrf_id, port);
12167         return;
12168 }
12169
12170 void
12171 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12172     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12173     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12174     uint32_t vrf_id, uint16_t port)
12175 {
12176         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12177             mflowtype, mflowid, fibnum,
12178             vrf_id, port);
12179         return;
12180 }
12181
12182 static struct mbuf *
12183 sctp_copy_resume(struct uio *uio,
12184     int max_send_len,
12185     int user_marks_eor,
12186     int *error,
12187     uint32_t * sndout,
12188     struct mbuf **new_tail)
12189 {
12190         struct mbuf *m;
12191
12192         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12193             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12194         if (m == NULL) {
12195                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12196                 *error = ENOBUFS;
12197         } else {
12198                 *sndout = m_length(m, NULL);
12199                 *new_tail = m_last(m);
12200         }
12201         return (m);
12202 }
12203
12204 static int
12205 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12206     struct uio *uio,
12207     int resv_upfront)
12208 {
12209         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12210             resv_upfront, 0);
12211         if (sp->data == NULL) {
12212                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12213                 return (ENOBUFS);
12214         }
12215         sp->tail_mbuf = m_last(sp->data);
12216         return (0);
12217 }
12218
12219
12220
12221 static struct sctp_stream_queue_pending *
12222 sctp_copy_it_in(struct sctp_tcb *stcb,
12223     struct sctp_association *asoc,
12224     struct sctp_sndrcvinfo *srcv,
12225     struct uio *uio,
12226     struct sctp_nets *net,
12227     int max_send_len,
12228     int user_marks_eor,
12229     int *error)
12230 {
12231         /*-
12232          * This routine must be very careful in its work. Protocol
12233          * processing is up and running so care must be taken to spl...()
12234          * when you need to do something that may effect the stcb/asoc. The
12235          * sb is locked however. When data is copied the protocol processing
12236          * should be enabled since this is a slower operation...
12237          */
12238         struct sctp_stream_queue_pending *sp = NULL;
12239         int resv_in_first;
12240
12241         *error = 0;
12242         /* Now can we send this? */
12243         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12244             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12245             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12246             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12247                 /* got data while shutting down */
12248                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12249                 *error = ECONNRESET;
12250                 goto out_now;
12251         }
12252         sctp_alloc_a_strmoq(stcb, sp);
12253         if (sp == NULL) {
12254                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12255                 *error = ENOMEM;
12256                 goto out_now;
12257         }
12258         sp->act_flags = 0;
12259         sp->sender_all_done = 0;
12260         sp->sinfo_flags = srcv->sinfo_flags;
12261         sp->timetolive = srcv->sinfo_timetolive;
12262         sp->ppid = srcv->sinfo_ppid;
12263         sp->context = srcv->sinfo_context;
12264         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12265
12266         sp->stream = srcv->sinfo_stream;
12267         sp->length = min(uio->uio_resid, max_send_len);
12268         if ((sp->length == (uint32_t) uio->uio_resid) &&
12269             ((user_marks_eor == 0) ||
12270             (srcv->sinfo_flags & SCTP_EOF) ||
12271             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12272                 sp->msg_is_complete = 1;
12273         } else {
12274                 sp->msg_is_complete = 0;
12275         }
12276         sp->sender_all_done = 0;
12277         sp->some_taken = 0;
12278         sp->put_last_out = 0;
12279         resv_in_first = sizeof(struct sctp_data_chunk);
12280         sp->data = sp->tail_mbuf = NULL;
12281         if (sp->length == 0) {
12282                 *error = 0;
12283                 goto skip_copy;
12284         }
12285         if (srcv->sinfo_keynumber_valid) {
12286                 sp->auth_keyid = srcv->sinfo_keynumber;
12287         } else {
12288                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12289         }
12290         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12291                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12292                 sp->holds_key_ref = 1;
12293         }
12294         *error = sctp_copy_one(sp, uio, resv_in_first);
12295 skip_copy:
12296         if (*error) {
12297                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12298                 sp = NULL;
12299         } else {
12300                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12301                         sp->net = net;
12302                         atomic_add_int(&sp->net->ref_count, 1);
12303                 } else {
12304                         sp->net = NULL;
12305                 }
12306                 sctp_set_prsctp_policy(sp);
12307         }
12308 out_now:
12309         return (sp);
12310 }
12311
12312
12313 int
12314 sctp_sosend(struct socket *so,
12315     struct sockaddr *addr,
12316     struct uio *uio,
12317     struct mbuf *top,
12318     struct mbuf *control,
12319     int flags,
12320     struct thread *p
12321 )
12322 {
12323         int error, use_sndinfo = 0;
12324         struct sctp_sndrcvinfo sndrcvninfo;
12325         struct sockaddr *addr_to_use;
12326
12327 #if defined(INET) && defined(INET6)
12328         struct sockaddr_in sin;
12329
12330 #endif
12331
12332         if (control) {
12333                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12334                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12335                     sizeof(sndrcvninfo))) {
12336                         /* got one */
12337                         use_sndinfo = 1;
12338                 }
12339         }
12340         addr_to_use = addr;
12341 #if defined(INET) && defined(INET6)
12342         if ((addr) && (addr->sa_family == AF_INET6)) {
12343                 struct sockaddr_in6 *sin6;
12344
12345                 sin6 = (struct sockaddr_in6 *)addr;
12346                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12347                         in6_sin6_2_sin(&sin, sin6);
12348                         addr_to_use = (struct sockaddr *)&sin;
12349                 }
12350         }
12351 #endif
12352         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12353             control,
12354             flags,
12355             use_sndinfo ? &sndrcvninfo : NULL
12356             ,p
12357             );
12358         return (error);
12359 }
12360
12361
12362 int
12363 sctp_lower_sosend(struct socket *so,
12364     struct sockaddr *addr,
12365     struct uio *uio,
12366     struct mbuf *i_pak,
12367     struct mbuf *control,
12368     int flags,
12369     struct sctp_sndrcvinfo *srcv
12370     ,
12371     struct thread *p
12372 )
12373 {
12374         unsigned int sndlen = 0, max_len;
12375         int error, len;
12376         struct mbuf *top = NULL;
12377         int queue_only = 0, queue_only_for_init = 0;
12378         int free_cnt_applied = 0;
12379         int un_sent;
12380         int now_filled = 0;
12381         unsigned int inqueue_bytes = 0;
12382         struct sctp_block_entry be;
12383         struct sctp_inpcb *inp;
12384         struct sctp_tcb *stcb = NULL;
12385         struct timeval now;
12386         struct sctp_nets *net;
12387         struct sctp_association *asoc;
12388         struct sctp_inpcb *t_inp;
12389         int user_marks_eor;
12390         int create_lock_applied = 0;
12391         int nagle_applies = 0;
12392         int some_on_control = 0;
12393         int got_all_of_the_send = 0;
12394         int hold_tcblock = 0;
12395         int non_blocking = 0;
12396         uint32_t local_add_more, local_soresv = 0;
12397         uint16_t port;
12398         uint16_t sinfo_flags;
12399         sctp_assoc_t sinfo_assoc_id;
12400
12401         error = 0;
12402         net = NULL;
12403         stcb = NULL;
12404         asoc = NULL;
12405
12406         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12407         if (inp == NULL) {
12408                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12409                 error = EINVAL;
12410                 if (i_pak) {
12411                         SCTP_RELEASE_PKT(i_pak);
12412                 }
12413                 return (error);
12414         }
12415         if ((uio == NULL) && (i_pak == NULL)) {
12416                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12417                 return (EINVAL);
12418         }
12419         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12420         atomic_add_int(&inp->total_sends, 1);
12421         if (uio) {
12422                 if (uio->uio_resid < 0) {
12423                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12424                         return (EINVAL);
12425                 }
12426                 sndlen = uio->uio_resid;
12427         } else {
12428                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12429                 sndlen = SCTP_HEADER_LEN(i_pak);
12430         }
12431         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12432             (void *)addr,
12433             sndlen);
12434         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12435             (inp->sctp_socket->so_qlimit)) {
12436                 /* The listener can NOT send */
12437                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12438                 error = ENOTCONN;
12439                 goto out_unlocked;
12440         }
12441         /**
12442          * Pre-screen address, if one is given the sin-len
12443          * must be set correctly!
12444          */
12445         if (addr) {
12446                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12447
12448                 switch (raddr->sa.sa_family) {
12449 #ifdef INET
12450                 case AF_INET:
12451                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12452                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12453                                 error = EINVAL;
12454                                 goto out_unlocked;
12455                         }
12456                         port = raddr->sin.sin_port;
12457                         break;
12458 #endif
12459 #ifdef INET6
12460                 case AF_INET6:
12461                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12462                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12463                                 error = EINVAL;
12464                                 goto out_unlocked;
12465                         }
12466                         port = raddr->sin6.sin6_port;
12467                         break;
12468 #endif
12469                 default:
12470                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12471                         error = EAFNOSUPPORT;
12472                         goto out_unlocked;
12473                 }
12474         } else
12475                 port = 0;
12476
12477         if (srcv) {
12478                 sinfo_flags = srcv->sinfo_flags;
12479                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12480                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12481                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12482                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12483                         error = EINVAL;
12484                         goto out_unlocked;
12485                 }
12486                 if (srcv->sinfo_flags)
12487                         SCTP_STAT_INCR(sctps_sends_with_flags);
12488         } else {
12489                 sinfo_flags = inp->def_send.sinfo_flags;
12490                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12491         }
12492         if (sinfo_flags & SCTP_SENDALL) {
12493                 /* its a sendall */
12494                 error = sctp_sendall(inp, uio, top, srcv);
12495                 top = NULL;
12496                 goto out_unlocked;
12497         }
12498         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12499                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12500                 error = EINVAL;
12501                 goto out_unlocked;
12502         }
12503         /* now we must find the assoc */
12504         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12505             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12506                 SCTP_INP_RLOCK(inp);
12507                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12508                 if (stcb) {
12509                         SCTP_TCB_LOCK(stcb);
12510                         hold_tcblock = 1;
12511                 }
12512                 SCTP_INP_RUNLOCK(inp);
12513         } else if (sinfo_assoc_id) {
12514                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12515         } else if (addr) {
12516                 /*-
12517                  * Since we did not use findep we must
12518                  * increment it, and if we don't find a tcb
12519                  * decrement it.
12520                  */
12521                 SCTP_INP_WLOCK(inp);
12522                 SCTP_INP_INCR_REF(inp);
12523                 SCTP_INP_WUNLOCK(inp);
12524                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12525                 if (stcb == NULL) {
12526                         SCTP_INP_WLOCK(inp);
12527                         SCTP_INP_DECR_REF(inp);
12528                         SCTP_INP_WUNLOCK(inp);
12529                 } else {
12530                         hold_tcblock = 1;
12531                 }
12532         }
12533         if ((stcb == NULL) && (addr)) {
12534                 /* Possible implicit send? */
12535                 SCTP_ASOC_CREATE_LOCK(inp);
12536                 create_lock_applied = 1;
12537                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12538                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12539                         /* Should I really unlock ? */
12540                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12541                         error = EINVAL;
12542                         goto out_unlocked;
12543
12544                 }
12545                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12546                     (addr->sa_family == AF_INET6)) {
12547                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12548                         error = EINVAL;
12549                         goto out_unlocked;
12550                 }
12551                 SCTP_INP_WLOCK(inp);
12552                 SCTP_INP_INCR_REF(inp);
12553                 SCTP_INP_WUNLOCK(inp);
12554                 /* With the lock applied look again */
12555                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12556                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12557                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12558                 }
12559                 if (stcb == NULL) {
12560                         SCTP_INP_WLOCK(inp);
12561                         SCTP_INP_DECR_REF(inp);
12562                         SCTP_INP_WUNLOCK(inp);
12563                 } else {
12564                         hold_tcblock = 1;
12565                 }
12566                 if (error) {
12567                         goto out_unlocked;
12568                 }
12569                 if (t_inp != inp) {
12570                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12571                         error = ENOTCONN;
12572                         goto out_unlocked;
12573                 }
12574         }
12575         if (stcb == NULL) {
12576                 if (addr == NULL) {
12577                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12578                         error = ENOENT;
12579                         goto out_unlocked;
12580                 } else {
12581                         /* We must go ahead and start the INIT process */
12582                         uint32_t vrf_id;
12583
12584                         if ((sinfo_flags & SCTP_ABORT) ||
12585                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12586                                 /*-
12587                                  * User asks to abort a non-existant assoc,
12588                                  * or EOF a non-existant assoc with no data
12589                                  */
12590                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12591                                 error = ENOENT;
12592                                 goto out_unlocked;
12593                         }
12594                         /* get an asoc/stcb struct */
12595                         vrf_id = inp->def_vrf_id;
12596 #ifdef INVARIANTS
12597                         if (create_lock_applied == 0) {
12598                                 panic("Error, should hold create lock and I don't?");
12599                         }
12600 #endif
12601                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12602                             inp->sctp_ep.pre_open_stream_count,
12603                             p
12604                             );
12605                         if (stcb == NULL) {
12606                                 /* Error is setup for us in the call */
12607                                 goto out_unlocked;
12608                         }
12609                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12610                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12611                                 /*
12612                                  * Set the connected flag so we can queue
12613                                  * data
12614                                  */
12615                                 soisconnecting(so);
12616                         }
12617                         hold_tcblock = 1;
12618                         if (create_lock_applied) {
12619                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12620                                 create_lock_applied = 0;
12621                         } else {
12622                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12623                         }
12624                         /*
12625                          * Turn on queue only flag to prevent data from
12626                          * being sent
12627                          */
12628                         queue_only = 1;
12629                         asoc = &stcb->asoc;
12630                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12631                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12632
12633                         /* initialize authentication params for the assoc */
12634                         sctp_initialize_auth_params(inp, stcb);
12635
12636                         if (control) {
12637                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12638                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12639                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12640                                         hold_tcblock = 0;
12641                                         stcb = NULL;
12642                                         goto out_unlocked;
12643                                 }
12644                         }
12645                         /* out with the INIT */
12646                         queue_only_for_init = 1;
12647                         /*-
12648                          * we may want to dig in after this call and adjust the MTU
12649                          * value. It defaulted to 1500 (constant) but the ro
12650                          * structure may now have an update and thus we may need to
12651                          * change it BEFORE we append the message.
12652                          */
12653                 }
12654         } else
12655                 asoc = &stcb->asoc;
12656         if (srcv == NULL)
12657                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12658         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12659                 if (addr)
12660                         net = sctp_findnet(stcb, addr);
12661                 else
12662                         net = NULL;
12663                 if ((net == NULL) ||
12664                     ((port != 0) && (port != stcb->rport))) {
12665                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12666                         error = EINVAL;
12667                         goto out_unlocked;
12668                 }
12669         } else {
12670                 if (stcb->asoc.alternate) {
12671                         net = stcb->asoc.alternate;
12672                 } else {
12673                         net = stcb->asoc.primary_destination;
12674                 }
12675         }
12676         atomic_add_int(&stcb->total_sends, 1);
12677         /* Keep the stcb from being freed under our feet */
12678         atomic_add_int(&asoc->refcnt, 1);
12679         free_cnt_applied = 1;
12680
12681         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12682                 if (sndlen > asoc->smallest_mtu) {
12683                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12684                         error = EMSGSIZE;
12685                         goto out_unlocked;
12686                 }
12687         }
12688         if (SCTP_SO_IS_NBIO(so)
12689             || (flags & MSG_NBIO)
12690             ) {
12691                 non_blocking = 1;
12692         }
12693         /* would we block? */
12694         if (non_blocking) {
12695                 if (hold_tcblock == 0) {
12696                         SCTP_TCB_LOCK(stcb);
12697                         hold_tcblock = 1;
12698                 }
12699                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12700                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12701                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12702                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12703                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12704                                 error = EMSGSIZE;
12705                         else
12706                                 error = EWOULDBLOCK;
12707                         goto out_unlocked;
12708                 }
12709                 stcb->asoc.sb_send_resv += sndlen;
12710                 SCTP_TCB_UNLOCK(stcb);
12711                 hold_tcblock = 0;
12712         } else {
12713                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12714         }
12715         local_soresv = sndlen;
12716         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12717                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12718                 error = ECONNRESET;
12719                 goto out_unlocked;
12720         }
12721         if (create_lock_applied) {
12722                 SCTP_ASOC_CREATE_UNLOCK(inp);
12723                 create_lock_applied = 0;
12724         }
12725         /* Is the stream no. valid? */
12726         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12727                 /* Invalid stream number */
12728                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12729                 error = EINVAL;
12730                 goto out_unlocked;
12731         }
12732         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12733             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12734                 /*
12735                  * Can't queue any data while stream reset is underway.
12736                  */
12737                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12738                         error = EAGAIN;
12739                 } else {
12740                         error = EINVAL;
12741                 }
12742                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12743                 goto out_unlocked;
12744         }
12745         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12746             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12747                 queue_only = 1;
12748         }
12749         /* we are now done with all control */
12750         if (control) {
12751                 sctp_m_freem(control);
12752                 control = NULL;
12753         }
12754         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12755             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12756             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12757             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12758                 if (srcv->sinfo_flags & SCTP_ABORT) {
12759                         ;
12760                 } else {
12761                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12762                         error = ECONNRESET;
12763                         goto out_unlocked;
12764                 }
12765         }
12766         /* Ok, we will attempt a msgsnd :> */
12767         if (p) {
12768                 p->td_ru.ru_msgsnd++;
12769         }
12770         /* Are we aborting? */
12771         if (srcv->sinfo_flags & SCTP_ABORT) {
12772                 struct mbuf *mm;
12773                 int tot_demand, tot_out = 0, max_out;
12774
12775                 SCTP_STAT_INCR(sctps_sends_with_abort);
12776                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12777                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12778                         /* It has to be up before we abort */
12779                         /* how big is the user initiated abort? */
12780                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12781                         error = EINVAL;
12782                         goto out;
12783                 }
12784                 if (hold_tcblock) {
12785                         SCTP_TCB_UNLOCK(stcb);
12786                         hold_tcblock = 0;
12787                 }
12788                 if (top) {
12789                         struct mbuf *cntm = NULL;
12790
12791                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12792                         if (sndlen != 0) {
12793                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12794                                         tot_out += SCTP_BUF_LEN(cntm);
12795                                 }
12796                         }
12797                 } else {
12798                         /* Must fit in a MTU */
12799                         tot_out = sndlen;
12800                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12801                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12802                                 /* To big */
12803                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12804                                 error = EMSGSIZE;
12805                                 goto out;
12806                         }
12807                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12808                 }
12809                 if (mm == NULL) {
12810                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12811                         error = ENOMEM;
12812                         goto out;
12813                 }
12814                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12815                 max_out -= sizeof(struct sctp_abort_msg);
12816                 if (tot_out > max_out) {
12817                         tot_out = max_out;
12818                 }
12819                 if (mm) {
12820                         struct sctp_paramhdr *ph;
12821
12822                         /* now move forward the data pointer */
12823                         ph = mtod(mm, struct sctp_paramhdr *);
12824                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12825                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12826                         ph++;
12827                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12828                         if (top == NULL) {
12829                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12830                                 if (error) {
12831                                         /*-
12832                                          * Here if we can't get his data we
12833                                          * still abort we just don't get to
12834                                          * send the users note :-0
12835                                          */
12836                                         sctp_m_freem(mm);
12837                                         mm = NULL;
12838                                 }
12839                         } else {
12840                                 if (sndlen != 0) {
12841                                         SCTP_BUF_NEXT(mm) = top;
12842                                 }
12843                         }
12844                 }
12845                 if (hold_tcblock == 0) {
12846                         SCTP_TCB_LOCK(stcb);
12847                 }
12848                 atomic_add_int(&stcb->asoc.refcnt, -1);
12849                 free_cnt_applied = 0;
12850                 /* release this lock, otherwise we hang on ourselves */
12851                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12852                 /* now relock the stcb so everything is sane */
12853                 hold_tcblock = 0;
12854                 stcb = NULL;
12855                 /*
12856                  * In this case top is already chained to mm avoid double
12857                  * free, since we free it below if top != NULL and driver
12858                  * would free it after sending the packet out
12859                  */
12860                 if (sndlen != 0) {
12861                         top = NULL;
12862                 }
12863                 goto out_unlocked;
12864         }
12865         /* Calculate the maximum we can send */
12866         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12867         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12868                 if (non_blocking) {
12869                         /* we already checked for non-blocking above. */
12870                         max_len = sndlen;
12871                 } else {
12872                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12873                 }
12874         } else {
12875                 max_len = 0;
12876         }
12877         if (hold_tcblock) {
12878                 SCTP_TCB_UNLOCK(stcb);
12879                 hold_tcblock = 0;
12880         }
12881         if (asoc->strmout == NULL) {
12882                 /* huh? software error */
12883                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12884                 error = EFAULT;
12885                 goto out_unlocked;
12886         }
12887         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12888         if ((user_marks_eor == 0) &&
12889             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12890                 /* It will NEVER fit */
12891                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12892                 error = EMSGSIZE;
12893                 goto out_unlocked;
12894         }
12895         if ((uio == NULL) && user_marks_eor) {
12896                 /*-
12897                  * We do not support eeor mode for
12898                  * sending with mbuf chains (like sendfile).
12899                  */
12900                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12901                 error = EINVAL;
12902                 goto out_unlocked;
12903         }
12904         if (user_marks_eor) {
12905                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12906         } else {
12907                 /*-
12908                  * For non-eeor the whole message must fit in
12909                  * the socket send buffer.
12910                  */
12911                 local_add_more = sndlen;
12912         }
12913         len = 0;
12914         if (non_blocking) {
12915                 goto skip_preblock;
12916         }
12917         if (((max_len <= local_add_more) &&
12918             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12919             (max_len == 0) ||
12920             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12921                 /* No room right now ! */
12922                 SOCKBUF_LOCK(&so->so_snd);
12923                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12924                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12925                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12926                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12927                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12928                             inqueue_bytes,
12929                             local_add_more,
12930                             stcb->asoc.stream_queue_cnt,
12931                             stcb->asoc.chunks_on_out_queue,
12932                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12933                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12934                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12935                         }
12936                         be.error = 0;
12937                         stcb->block_entry = &be;
12938                         error = sbwait(&so->so_snd);
12939                         stcb->block_entry = NULL;
12940                         if (error || so->so_error || be.error) {
12941                                 if (error == 0) {
12942                                         if (so->so_error)
12943                                                 error = so->so_error;
12944                                         if (be.error) {
12945                                                 error = be.error;
12946                                         }
12947                                 }
12948                                 SOCKBUF_UNLOCK(&so->so_snd);
12949                                 goto out_unlocked;
12950                         }
12951                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12952                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12953                                     asoc, stcb->asoc.total_output_queue_size);
12954                         }
12955                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12956                                 goto out_unlocked;
12957                         }
12958                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12959                 }
12960                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12961                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12962                 } else {
12963                         max_len = 0;
12964                 }
12965                 SOCKBUF_UNLOCK(&so->so_snd);
12966         }
12967 skip_preblock:
12968         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12969                 goto out_unlocked;
12970         }
12971         /*
12972          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12973          * case NOTE: uio will be null when top/mbuf is passed
12974          */
12975         if (sndlen == 0) {
12976                 if (srcv->sinfo_flags & SCTP_EOF) {
12977                         got_all_of_the_send = 1;
12978                         goto dataless_eof;
12979                 } else {
12980                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12981                         error = EINVAL;
12982                         goto out;
12983                 }
12984         }
12985         if (top == NULL) {
12986                 struct sctp_stream_queue_pending *sp;
12987                 struct sctp_stream_out *strm;
12988                 uint32_t sndout;
12989
12990                 SCTP_TCB_SEND_LOCK(stcb);
12991                 if ((asoc->stream_locked) &&
12992                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12993                         SCTP_TCB_SEND_UNLOCK(stcb);
12994                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12995                         error = EINVAL;
12996                         goto out;
12997                 }
12998                 SCTP_TCB_SEND_UNLOCK(stcb);
12999
13000                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13001                 if (strm->last_msg_incomplete == 0) {
13002         do_a_copy_in:
13003                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13004                         if ((sp == NULL) || (error)) {
13005                                 goto out;
13006                         }
13007                         SCTP_TCB_SEND_LOCK(stcb);
13008                         if (sp->msg_is_complete) {
13009                                 strm->last_msg_incomplete = 0;
13010                                 asoc->stream_locked = 0;
13011                         } else {
13012                                 /*
13013                                  * Just got locked to this guy in case of an
13014                                  * interrupt.
13015                                  */
13016                                 strm->last_msg_incomplete = 1;
13017                                 asoc->stream_locked = 1;
13018                                 asoc->stream_locked_on = srcv->sinfo_stream;
13019                                 sp->sender_all_done = 0;
13020                         }
13021                         sctp_snd_sb_alloc(stcb, sp->length);
13022                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13023                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13024                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13025                         }
13026                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13027                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13028                         SCTP_TCB_SEND_UNLOCK(stcb);
13029                 } else {
13030                         SCTP_TCB_SEND_LOCK(stcb);
13031                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13032                         SCTP_TCB_SEND_UNLOCK(stcb);
13033                         if (sp == NULL) {
13034                                 /* ???? Huh ??? last msg is gone */
13035 #ifdef INVARIANTS
13036                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13037 #else
13038                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13039                                 strm->last_msg_incomplete = 0;
13040 #endif
13041                                 goto do_a_copy_in;
13042
13043                         }
13044                 }
13045                 while (uio->uio_resid > 0) {
13046                         /* How much room do we have? */
13047                         struct mbuf *new_tail, *mm;
13048
13049                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13050                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13051                         else
13052                                 max_len = 0;
13053
13054                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13055                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13056                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13057                                 sndout = 0;
13058                                 new_tail = NULL;
13059                                 if (hold_tcblock) {
13060                                         SCTP_TCB_UNLOCK(stcb);
13061                                         hold_tcblock = 0;
13062                                 }
13063                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13064                                 if ((mm == NULL) || error) {
13065                                         if (mm) {
13066                                                 sctp_m_freem(mm);
13067                                         }
13068                                         goto out;
13069                                 }
13070                                 /* Update the mbuf and count */
13071                                 SCTP_TCB_SEND_LOCK(stcb);
13072                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13073                                         /*
13074                                          * we need to get out. Peer probably
13075                                          * aborted.
13076                                          */
13077                                         sctp_m_freem(mm);
13078                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13079                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13080                                                 error = ECONNRESET;
13081                                         }
13082                                         SCTP_TCB_SEND_UNLOCK(stcb);
13083                                         goto out;
13084                                 }
13085                                 if (sp->tail_mbuf) {
13086                                         /* tack it to the end */
13087                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13088                                         sp->tail_mbuf = new_tail;
13089                                 } else {
13090                                         /* A stolen mbuf */
13091                                         sp->data = mm;
13092                                         sp->tail_mbuf = new_tail;
13093                                 }
13094                                 sctp_snd_sb_alloc(stcb, sndout);
13095                                 atomic_add_int(&sp->length, sndout);
13096                                 len += sndout;
13097
13098                                 /* Did we reach EOR? */
13099                                 if ((uio->uio_resid == 0) &&
13100                                     ((user_marks_eor == 0) ||
13101                                     (srcv->sinfo_flags & SCTP_EOF) ||
13102                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13103                                         sp->msg_is_complete = 1;
13104                                 } else {
13105                                         sp->msg_is_complete = 0;
13106                                 }
13107                                 SCTP_TCB_SEND_UNLOCK(stcb);
13108                         }
13109                         if (uio->uio_resid == 0) {
13110                                 /* got it all? */
13111                                 continue;
13112                         }
13113                         /* PR-SCTP? */
13114                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13115                                 /*
13116                                  * This is ugly but we must assure locking
13117                                  * order
13118                                  */
13119                                 if (hold_tcblock == 0) {
13120                                         SCTP_TCB_LOCK(stcb);
13121                                         hold_tcblock = 1;
13122                                 }
13123                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13124                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13125                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13126                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13127                                 else
13128                                         max_len = 0;
13129                                 if (max_len > 0) {
13130                                         continue;
13131                                 }
13132                                 SCTP_TCB_UNLOCK(stcb);
13133                                 hold_tcblock = 0;
13134                         }
13135                         /* wait for space now */
13136                         if (non_blocking) {
13137                                 /* Non-blocking io in place out */
13138                                 goto skip_out_eof;
13139                         }
13140                         /* What about the INIT, send it maybe */
13141                         if (queue_only_for_init) {
13142                                 if (hold_tcblock == 0) {
13143                                         SCTP_TCB_LOCK(stcb);
13144                                         hold_tcblock = 1;
13145                                 }
13146                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13147                                         /* a collision took us forward? */
13148                                         queue_only = 0;
13149                                 } else {
13150                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13151                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13152                                         queue_only = 1;
13153                                 }
13154                         }
13155                         if ((net->flight_size > net->cwnd) &&
13156                             (asoc->sctp_cmt_on_off == 0)) {
13157                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13158                                 queue_only = 1;
13159                         } else if (asoc->ifp_had_enobuf) {
13160                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13161                                 if (net->flight_size > (2 * net->mtu)) {
13162                                         queue_only = 1;
13163                                 }
13164                                 asoc->ifp_had_enobuf = 0;
13165                         }
13166                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13167                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13168                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13169                             (stcb->asoc.total_flight > 0) &&
13170                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13171                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13172
13173                                 /*-
13174                                  * Ok, Nagle is set on and we have data outstanding.
13175                                  * Don't send anything and let SACKs drive out the
13176                                  * data unless we have a "full" segment to send.
13177                                  */
13178                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13179                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13180                                 }
13181                                 SCTP_STAT_INCR(sctps_naglequeued);
13182                                 nagle_applies = 1;
13183                         } else {
13184                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13185                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13186                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13187                                 }
13188                                 SCTP_STAT_INCR(sctps_naglesent);
13189                                 nagle_applies = 0;
13190                         }
13191                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13192
13193                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13194                                     nagle_applies, un_sent);
13195                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13196                                     stcb->asoc.total_flight,
13197                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13198                         }
13199                         if (queue_only_for_init)
13200                                 queue_only_for_init = 0;
13201                         if ((queue_only == 0) && (nagle_applies == 0)) {
13202                                 /*-
13203                                  * need to start chunk output
13204                                  * before blocking.. note that if
13205                                  * a lock is already applied, then
13206                                  * the input via the net is happening
13207                                  * and I don't need to start output :-D
13208                                  */
13209                                 if (hold_tcblock == 0) {
13210                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13211                                                 hold_tcblock = 1;
13212                                                 sctp_chunk_output(inp,
13213                                                     stcb,
13214                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13215                                         }
13216                                 } else {
13217                                         sctp_chunk_output(inp,
13218                                             stcb,
13219                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13220                                 }
13221                                 if (hold_tcblock == 1) {
13222                                         SCTP_TCB_UNLOCK(stcb);
13223                                         hold_tcblock = 0;
13224                                 }
13225                         }
13226                         SOCKBUF_LOCK(&so->so_snd);
13227                         /*-
13228                          * This is a bit strange, but I think it will
13229                          * work. The total_output_queue_size is locked and
13230                          * protected by the TCB_LOCK, which we just released.
13231                          * There is a race that can occur between releasing it
13232                          * above, and me getting the socket lock, where sacks
13233                          * come in but we have not put the SB_WAIT on the
13234                          * so_snd buffer to get the wakeup. After the LOCK
13235                          * is applied the sack_processing will also need to
13236                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13237                          * once we have the socket buffer lock if we recheck the
13238                          * size we KNOW we will get to sleep safely with the
13239                          * wakeup flag in place.
13240                          */
13241                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13242                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13243                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13244                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13245                                             asoc, uio->uio_resid);
13246                                 }
13247                                 be.error = 0;
13248                                 stcb->block_entry = &be;
13249                                 error = sbwait(&so->so_snd);
13250                                 stcb->block_entry = NULL;
13251
13252                                 if (error || so->so_error || be.error) {
13253                                         if (error == 0) {
13254                                                 if (so->so_error)
13255                                                         error = so->so_error;
13256                                                 if (be.error) {
13257                                                         error = be.error;
13258                                                 }
13259                                         }
13260                                         SOCKBUF_UNLOCK(&so->so_snd);
13261                                         goto out_unlocked;
13262                                 }
13263                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13264                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13265                                             asoc, stcb->asoc.total_output_queue_size);
13266                                 }
13267                         }
13268                         SOCKBUF_UNLOCK(&so->so_snd);
13269                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13270                                 goto out_unlocked;
13271                         }
13272                 }
13273                 SCTP_TCB_SEND_LOCK(stcb);
13274                 if (sp) {
13275                         if (sp->msg_is_complete == 0) {
13276                                 strm->last_msg_incomplete = 1;
13277                                 asoc->stream_locked = 1;
13278                                 asoc->stream_locked_on = srcv->sinfo_stream;
13279                         } else {
13280                                 sp->sender_all_done = 1;
13281                                 strm->last_msg_incomplete = 0;
13282                                 asoc->stream_locked = 0;
13283                         }
13284                 } else {
13285                         SCTP_PRINTF("Huh no sp TSNH?\n");
13286                         strm->last_msg_incomplete = 0;
13287                         asoc->stream_locked = 0;
13288                 }
13289                 SCTP_TCB_SEND_UNLOCK(stcb);
13290                 if (uio->uio_resid == 0) {
13291                         got_all_of_the_send = 1;
13292                 }
13293         } else {
13294                 /* We send in a 0, since we do NOT have any locks */
13295                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13296                 top = NULL;
13297                 if (srcv->sinfo_flags & SCTP_EOF) {
13298                         /*
13299                          * This should only happen for Panda for the mbuf
13300                          * send case, which does NOT yet support EEOR mode.
13301                          * Thus, we can just set this flag to do the proper
13302                          * EOF handling.
13303                          */
13304                         got_all_of_the_send = 1;
13305                 }
13306         }
13307         if (error) {
13308                 goto out;
13309         }
13310 dataless_eof:
13311         /* EOF thing ? */
13312         if ((srcv->sinfo_flags & SCTP_EOF) &&
13313             (got_all_of_the_send == 1)) {
13314                 int cnt;
13315
13316                 SCTP_STAT_INCR(sctps_sends_with_eof);
13317                 error = 0;
13318                 if (hold_tcblock == 0) {
13319                         SCTP_TCB_LOCK(stcb);
13320                         hold_tcblock = 1;
13321                 }
13322                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13323                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13324                     TAILQ_EMPTY(&asoc->sent_queue) &&
13325                     (cnt == 0)) {
13326                         if (asoc->locked_on_sending) {
13327                                 goto abort_anyway;
13328                         }
13329                         /* there is nothing queued to send, so I'm done... */
13330                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13331                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13332                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13333                                 struct sctp_nets *netp;
13334
13335                                 /* only send SHUTDOWN the first time through */
13336                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13337                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13338                                 }
13339                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13340                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13341                                 sctp_stop_timers_for_shutdown(stcb);
13342                                 if (stcb->asoc.alternate) {
13343                                         netp = stcb->asoc.alternate;
13344                                 } else {
13345                                         netp = stcb->asoc.primary_destination;
13346                                 }
13347                                 sctp_send_shutdown(stcb, netp);
13348                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13349                                     netp);
13350                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13351                                     asoc->primary_destination);
13352                         }
13353                 } else {
13354                         /*-
13355                          * we still got (or just got) data to send, so set
13356                          * SHUTDOWN_PENDING
13357                          */
13358                         /*-
13359                          * XXX sockets draft says that SCTP_EOF should be
13360                          * sent with no data.  currently, we will allow user
13361                          * data to be sent first and move to
13362                          * SHUTDOWN-PENDING
13363                          */
13364                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13365                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13366                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13367                                 if (hold_tcblock == 0) {
13368                                         SCTP_TCB_LOCK(stcb);
13369                                         hold_tcblock = 1;
13370                                 }
13371                                 if (asoc->locked_on_sending) {
13372                                         /* Locked to send out the data */
13373                                         struct sctp_stream_queue_pending *sp;
13374
13375                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13376                                         if (sp) {
13377                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13378                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13379                                         }
13380                                 }
13381                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13382                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13383                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13384                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13385                                         struct mbuf *op_err;
13386                                         char msg[SCTP_DIAG_INFO_LEN];
13387
13388                         abort_anyway:
13389                                         if (free_cnt_applied) {
13390                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13391                                                 free_cnt_applied = 0;
13392                                         }
13393                                         snprintf(msg, sizeof(msg),
13394                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13395                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13396                                             msg);
13397                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13398                                             op_err, SCTP_SO_LOCKED);
13399                                         /*
13400                                          * now relock the stcb so everything
13401                                          * is sane
13402                                          */
13403                                         hold_tcblock = 0;
13404                                         stcb = NULL;
13405                                         goto out;
13406                                 }
13407                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13408                                     asoc->primary_destination);
13409                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13410                         }
13411                 }
13412         }
13413 skip_out_eof:
13414         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13415                 some_on_control = 1;
13416         }
13417         if (queue_only_for_init) {
13418                 if (hold_tcblock == 0) {
13419                         SCTP_TCB_LOCK(stcb);
13420                         hold_tcblock = 1;
13421                 }
13422                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13423                         /* a collision took us forward? */
13424                         queue_only = 0;
13425                 } else {
13426                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13427                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13428                         queue_only = 1;
13429                 }
13430         }
13431         if ((net->flight_size > net->cwnd) &&
13432             (stcb->asoc.sctp_cmt_on_off == 0)) {
13433                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13434                 queue_only = 1;
13435         } else if (asoc->ifp_had_enobuf) {
13436                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13437                 if (net->flight_size > (2 * net->mtu)) {
13438                         queue_only = 1;
13439                 }
13440                 asoc->ifp_had_enobuf = 0;
13441         }
13442         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13443             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13444         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13445             (stcb->asoc.total_flight > 0) &&
13446             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13447             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13448                 /*-
13449                  * Ok, Nagle is set on and we have data outstanding.
13450                  * Don't send anything and let SACKs drive out the
13451                  * data unless wen have a "full" segment to send.
13452                  */
13453                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13454                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13455                 }
13456                 SCTP_STAT_INCR(sctps_naglequeued);
13457                 nagle_applies = 1;
13458         } else {
13459                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13460                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13461                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13462                 }
13463                 SCTP_STAT_INCR(sctps_naglesent);
13464                 nagle_applies = 0;
13465         }
13466         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13467                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13468                     nagle_applies, un_sent);
13469                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13470                     stcb->asoc.total_flight,
13471                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13472         }
13473         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13474                 /* we can attempt to send too. */
13475                 if (hold_tcblock == 0) {
13476                         /*
13477                          * If there is activity recv'ing sacks no need to
13478                          * send
13479                          */
13480                         if (SCTP_TCB_TRYLOCK(stcb)) {
13481                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13482                                 hold_tcblock = 1;
13483                         }
13484                 } else {
13485                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13486                 }
13487         } else if ((queue_only == 0) &&
13488                     (stcb->asoc.peers_rwnd == 0) &&
13489             (stcb->asoc.total_flight == 0)) {
13490                 /* We get to have a probe outstanding */
13491                 if (hold_tcblock == 0) {
13492                         hold_tcblock = 1;
13493                         SCTP_TCB_LOCK(stcb);
13494                 }
13495                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13496         } else if (some_on_control) {
13497                 int num_out, reason, frag_point;
13498
13499                 /* Here we do control only */
13500                 if (hold_tcblock == 0) {
13501                         hold_tcblock = 1;
13502                         SCTP_TCB_LOCK(stcb);
13503                 }
13504                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13505                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13506                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13507         }
13508         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13509             queue_only, stcb->asoc.peers_rwnd, un_sent,
13510             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13511             stcb->asoc.total_output_queue_size, error);
13512
13513 out:
13514 out_unlocked:
13515
13516         if (local_soresv && stcb) {
13517                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13518         }
13519         if (create_lock_applied) {
13520                 SCTP_ASOC_CREATE_UNLOCK(inp);
13521         }
13522         if ((stcb) && hold_tcblock) {
13523                 SCTP_TCB_UNLOCK(stcb);
13524         }
13525         if (stcb && free_cnt_applied) {
13526                 atomic_add_int(&stcb->asoc.refcnt, -1);
13527         }
13528 #ifdef INVARIANTS
13529         if (stcb) {
13530                 if (mtx_owned(&stcb->tcb_mtx)) {
13531                         panic("Leaving with tcb mtx owned?");
13532                 }
13533                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13534                         panic("Leaving with tcb send mtx owned?");
13535                 }
13536         }
13537 #endif
13538         if (top) {
13539                 sctp_m_freem(top);
13540         }
13541         if (control) {
13542                 sctp_m_freem(control);
13543         }
13544         return (error);
13545 }
13546
13547
13548 /*
13549  * generate an AUTHentication chunk, if required
13550  */
13551 struct mbuf *
13552 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13553     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13554     struct sctp_tcb *stcb, uint8_t chunk)
13555 {
13556         struct mbuf *m_auth;
13557         struct sctp_auth_chunk *auth;
13558         int chunk_len;
13559         struct mbuf *cn;
13560
13561         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13562             (stcb == NULL))
13563                 return (m);
13564
13565         if (stcb->asoc.auth_supported == 0) {
13566                 return (m);
13567         }
13568         /* does the requested chunk require auth? */
13569         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13570                 return (m);
13571         }
13572         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13573         if (m_auth == NULL) {
13574                 /* no mbuf's */
13575                 return (m);
13576         }
13577         /* reserve some space if this will be the first mbuf */
13578         if (m == NULL)
13579                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13580         /* fill in the AUTH chunk details */
13581         auth = mtod(m_auth, struct sctp_auth_chunk *);
13582         bzero(auth, sizeof(*auth));
13583         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13584         auth->ch.chunk_flags = 0;
13585         chunk_len = sizeof(*auth) +
13586             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13587         auth->ch.chunk_length = htons(chunk_len);
13588         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13589         /* key id and hmac digest will be computed and filled in upon send */
13590
13591         /* save the offset where the auth was inserted into the chain */
13592         *offset = 0;
13593         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13594                 *offset += SCTP_BUF_LEN(cn);
13595         }
13596
13597         /* update length and return pointer to the auth chunk */
13598         SCTP_BUF_LEN(m_auth) = chunk_len;
13599         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13600         if (auth_ret != NULL)
13601                 *auth_ret = auth;
13602
13603         return (m);
13604 }
13605
13606 #ifdef INET6
13607 int
13608 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13609 {
13610         struct nd_prefix *pfx = NULL;
13611         struct nd_pfxrouter *pfxrtr = NULL;
13612         struct sockaddr_in6 gw6;
13613
13614         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13615                 return (0);
13616
13617         /* get prefix entry of address */
13618         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13619                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13620                         continue;
13621                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13622                     &src6->sin6_addr, &pfx->ndpr_mask))
13623                         break;
13624         }
13625         /* no prefix entry in the prefix list */
13626         if (pfx == NULL) {
13627                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13628                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13629                 return (0);
13630         }
13631         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13632         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13633
13634         /* search installed gateway from prefix entry */
13635         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13636                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13637                 gw6.sin6_family = AF_INET6;
13638                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13639                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13640                     sizeof(struct in6_addr));
13641                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13642                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13643                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13644                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13645                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13646                     ro->ro_rt->rt_gateway)) {
13647                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13648                         return (1);
13649                 }
13650         }
13651         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13652         return (0);
13653 }
13654
13655 #endif
13656
13657 int
13658 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13659 {
13660 #ifdef INET
13661         struct sockaddr_in *sin, *mask;
13662         struct ifaddr *ifa;
13663         struct in_addr srcnetaddr, gwnetaddr;
13664
13665         if (ro == NULL || ro->ro_rt == NULL ||
13666             sifa->address.sa.sa_family != AF_INET) {
13667                 return (0);
13668         }
13669         ifa = (struct ifaddr *)sifa->ifa;
13670         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13671         sin = &sifa->address.sin;
13672         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13673         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13674         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13675         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13676
13677         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13678         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13679         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13680         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13681         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13682         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13683                 return (1);
13684         }
13685 #endif
13686         return (0);
13687 }