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 (stcb) {
3226                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3227                         stcb->asoc.scope.ipv4_local_scope = 1;
3228                         retried = 1;
3229                         goto again_with_private_addresses_allowed;
3230                 } else if (retried == 1) {
3231                         stcb->asoc.scope.ipv4_local_scope = 0;
3232                 }
3233         }
3234 #endif
3235 out:
3236 #ifdef INET
3237         if (sifa) {
3238                 if (retried == 1) {
3239                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3240                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3241                                         /* wrong base scope */
3242                                         continue;
3243                                 }
3244                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3245                                         struct sctp_ifa *tmp_sifa;
3246
3247 #ifdef INET
3248                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3249                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3250                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3251                                                 continue;
3252                                         }
3253 #endif
3254 #ifdef INET6
3255                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3256                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3257                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3258                                                 continue;
3259                                         }
3260 #endif
3261                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3262                                             (non_asoc_addr_ok == 0))
3263                                                 continue;
3264                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3265                                             dest_is_loop,
3266                                             dest_is_priv, fam);
3267                                         if (tmp_sifa == NULL) {
3268                                                 continue;
3269                                         }
3270                                         if (tmp_sifa == sifa) {
3271                                                 continue;
3272                                         }
3273                                         if (stcb) {
3274                                                 if (sctp_is_address_in_scope(tmp_sifa,
3275                                                     &stcb->asoc.scope, 0) == 0) {
3276                                                         continue;
3277                                                 }
3278                                                 if (((non_asoc_addr_ok == 0) &&
3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3280                                                     (non_asoc_addr_ok &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3282                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3283                                                         /*
3284                                                          * It is restricted
3285                                                          * for some reason..
3286                                                          * probably not yet
3287                                                          * added.
3288                                                          */
3289                                                         continue;
3290                                                 }
3291                                         }
3292                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3293                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3294                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3295                                         }
3296                                 }
3297                         }
3298                 }
3299                 atomic_add_int(&sifa->refcount, 1);
3300         }
3301 #endif
3302         return (sifa);
3303 }
3304
3305
3306
3307 /* tcb may be NULL */
3308 struct sctp_ifa *
3309 sctp_source_address_selection(struct sctp_inpcb *inp,
3310     struct sctp_tcb *stcb,
3311     sctp_route_t * ro,
3312     struct sctp_nets *net,
3313     int non_asoc_addr_ok, uint32_t vrf_id)
3314 {
3315         struct sctp_ifa *answer;
3316         uint8_t dest_is_priv, dest_is_loop;
3317         sa_family_t fam;
3318
3319 #ifdef INET
3320         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3321
3322 #endif
3323 #ifdef INET6
3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325
3326 #endif
3327
3328         /**
3329          * Rules: - Find the route if needed, cache if I can. - Look at
3330          * interface address in route, Is it in the bound list. If so we
3331          * have the best source. - If not we must rotate amongst the
3332          * addresses.
3333          *
3334          * Cavets and issues
3335          *
3336          * Do we need to pay attention to scope. We can have a private address
3337          * or a global address we are sourcing or sending to. So if we draw
3338          * it out
3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340          * For V4
3341          * ------------------------------------------
3342          *      source     *      dest  *  result
3343          * -----------------------------------------
3344          * <a>  Private    *    Global  *  NAT
3345          * -----------------------------------------
3346          * <b>  Private    *    Private *  No problem
3347          * -----------------------------------------
3348          * <c>  Global     *    Private *  Huh, How will this work?
3349          * -----------------------------------------
3350          * <d>  Global     *    Global  *  No Problem
3351          *------------------------------------------
3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353          * For V6
3354          *------------------------------------------
3355          *      source     *      dest  *  result
3356          * -----------------------------------------
3357          * <a>  Linklocal  *    Global  *
3358          * -----------------------------------------
3359          * <b>  Linklocal  * Linklocal  *  No problem
3360          * -----------------------------------------
3361          * <c>  Global     * Linklocal  *  Huh, How will this work?
3362          * -----------------------------------------
3363          * <d>  Global     *    Global  *  No Problem
3364          *------------------------------------------
3365          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366          *
3367          * And then we add to that what happens if there are multiple addresses
3368          * assigned to an interface. Remember the ifa on a ifn is a linked
3369          * list of addresses. So one interface can have more than one IP
3370          * address. What happens if we have both a private and a global
3371          * address? Do we then use context of destination to sort out which
3372          * one is best? And what about NAT's sending P->G may get you a NAT
3373          * translation, or should you select the G thats on the interface in
3374          * preference.
3375          *
3376          * Decisions:
3377          *
3378          * - count the number of addresses on the interface.
3379          * - if it is one, no problem except case <c>.
3380          *   For <a> we will assume a NAT out there.
3381          * - if there are more than one, then we need to worry about scope P
3382          *   or G. We should prefer G -> G and P -> P if possible.
3383          *   Then as a secondary fall back to mixed types G->P being a last
3384          *   ditch one.
3385          * - The above all works for bound all, but bound specific we need to
3386          *   use the same concept but instead only consider the bound
3387          *   addresses. If the bound set is NOT assigned to the interface then
3388          *   we must use rotation amongst the bound addresses..
3389          */
3390         if (ro->ro_rt == NULL) {
3391                 /*
3392                  * Need a route to cache.
3393                  */
3394                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3395         }
3396         if (ro->ro_rt == NULL) {
3397                 return (NULL);
3398         }
3399         fam = ro->ro_dst.sa_family;
3400         dest_is_priv = dest_is_loop = 0;
3401         /* Setup our scopes for the destination */
3402         switch (fam) {
3403 #ifdef INET
3404         case AF_INET:
3405                 /* Scope based on outbound address */
3406                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407                         dest_is_loop = 1;
3408                         if (net != NULL) {
3409                                 /* mark it as local */
3410                                 net->addr_is_local = 1;
3411                         }
3412                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413                         dest_is_priv = 1;
3414                 }
3415                 break;
3416 #endif
3417 #ifdef INET6
3418         case AF_INET6:
3419                 /* Scope based on outbound address */
3420                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422                         /*
3423                          * If the address is a loopback address, which
3424                          * consists of "::1" OR "fe80::1%lo0", we are
3425                          * loopback scope. But we don't use dest_is_priv
3426                          * (link local addresses).
3427                          */
3428                         dest_is_loop = 1;
3429                         if (net != NULL) {
3430                                 /* mark it as local */
3431                                 net->addr_is_local = 1;
3432                         }
3433                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434                         dest_is_priv = 1;
3435                 }
3436                 break;
3437 #endif
3438         }
3439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441         SCTP_IPI_ADDR_RLOCK();
3442         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443                 /*
3444                  * Bound all case
3445                  */
3446                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447                     dest_is_priv, dest_is_loop,
3448                     non_asoc_addr_ok, fam);
3449                 SCTP_IPI_ADDR_RUNLOCK();
3450                 return (answer);
3451         }
3452         /*
3453          * Subset bound case
3454          */
3455         if (stcb) {
3456                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457                     vrf_id, dest_is_priv,
3458                     dest_is_loop,
3459                     non_asoc_addr_ok, fam);
3460         } else {
3461                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462                     non_asoc_addr_ok,
3463                     dest_is_priv,
3464                     dest_is_loop, fam);
3465         }
3466         SCTP_IPI_ADDR_RUNLOCK();
3467         return (answer);
3468 }
3469
3470 static int
3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472 {
3473         struct cmsghdr cmh;
3474         int tlen, at, found;
3475         struct sctp_sndinfo sndinfo;
3476         struct sctp_prinfo prinfo;
3477         struct sctp_authinfo authinfo;
3478
3479         tlen = SCTP_BUF_LEN(control);
3480         at = 0;
3481         found = 0;
3482         /*
3483          * Independent of how many mbufs, find the c_type inside the control
3484          * structure and copy out the data.
3485          */
3486         while (at < tlen) {
3487                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3488                         /* There is not enough room for one more. */
3489                         return (found);
3490                 }
3491                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3492                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3493                         /* We dont't have a complete CMSG header. */
3494                         return (found);
3495                 }
3496                 if (((int)cmh.cmsg_len + at) > tlen) {
3497                         /* We don't have the complete CMSG. */
3498                         return (found);
3499                 }
3500                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3501                     ((c_type == cmh.cmsg_type) ||
3502                     ((c_type == SCTP_SNDRCV) &&
3503                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3504                     (cmh.cmsg_type == SCTP_PRINFO) ||
3505                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3506                         if (c_type == cmh.cmsg_type) {
3507                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3508                                         return (found);
3509                                 }
3510                                 /* It is exactly what we want. Copy it out. */
3511                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3512                                 return (1);
3513                         } else {
3514                                 struct sctp_sndrcvinfo *sndrcvinfo;
3515
3516                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3517                                 if (found == 0) {
3518                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3519                                                 return (found);
3520                                         }
3521                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3522                                 }
3523                                 switch (cmh.cmsg_type) {
3524                                 case SCTP_SNDINFO:
3525                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3526                                                 return (found);
3527                                         }
3528                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3529                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3530                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3531                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3532                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3533                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3534                                         break;
3535                                 case SCTP_PRINFO:
3536                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3537                                                 return (found);
3538                                         }
3539                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3540                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3541                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3542                                         } else {
3543                                                 sndrcvinfo->sinfo_timetolive = 0;
3544                                         }
3545                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3546                                         break;
3547                                 case SCTP_AUTHINFO:
3548                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3549                                                 return (found);
3550                                         }
3551                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3552                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3553                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3554                                         break;
3555                                 default:
3556                                         return (found);
3557                                 }
3558                                 found = 1;
3559                         }
3560                 }
3561                 at += CMSG_ALIGN(cmh.cmsg_len);
3562         }
3563         return (found);
3564 }
3565
3566 static int
3567 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3568 {
3569         struct cmsghdr cmh;
3570         int tlen, at;
3571         struct sctp_initmsg initmsg;
3572
3573 #ifdef INET
3574         struct sockaddr_in sin;
3575
3576 #endif
3577 #ifdef INET6
3578         struct sockaddr_in6 sin6;
3579
3580 #endif
3581
3582         tlen = SCTP_BUF_LEN(control);
3583         at = 0;
3584         while (at < tlen) {
3585                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3586                         /* There is not enough room for one more. */
3587                         *error = EINVAL;
3588                         return (1);
3589                 }
3590                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3591                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3592                         /* We dont't have a complete CMSG header. */
3593                         *error = EINVAL;
3594                         return (1);
3595                 }
3596                 if (((int)cmh.cmsg_len + at) > tlen) {
3597                         /* We don't have the complete CMSG. */
3598                         *error = EINVAL;
3599                         return (1);
3600                 }
3601                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3602                         switch (cmh.cmsg_type) {
3603                         case SCTP_INIT:
3604                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3605                                         *error = EINVAL;
3606                                         return (1);
3607                                 }
3608                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3609                                 if (initmsg.sinit_max_attempts)
3610                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3611                                 if (initmsg.sinit_num_ostreams)
3612                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3613                                 if (initmsg.sinit_max_instreams)
3614                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3615                                 if (initmsg.sinit_max_init_timeo)
3616                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3617                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3618                                         struct sctp_stream_out *tmp_str;
3619                                         unsigned int i;
3620
3621 #if defined(SCTP_DETAILED_STR_STATS)
3622                                         int j;
3623
3624 #endif
3625
3626                                         /* Default is NOT correct */
3627                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3628                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3629                                         SCTP_TCB_UNLOCK(stcb);
3630                                         SCTP_MALLOC(tmp_str,
3631                                             struct sctp_stream_out *,
3632                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3633                                             SCTP_M_STRMO);
3634                                         SCTP_TCB_LOCK(stcb);
3635                                         if (tmp_str != NULL) {
3636                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3637                                                 stcb->asoc.strmout = tmp_str;
3638                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3639                                         } else {
3640                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3641                                         }
3642                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3643                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3644                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3645                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3646 #if defined(SCTP_DETAILED_STR_STATS)
3647                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3648                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3649                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3650                                                 }
3651 #else
3652                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3653                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3654 #endif
3655                                                 stcb->asoc.strmout[i].stream_no = i;
3656                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3657                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3658                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3659                                         }
3660                                 }
3661                                 break;
3662 #ifdef INET
3663                         case SCTP_DSTADDRV4:
3664                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3665                                         *error = EINVAL;
3666                                         return (1);
3667                                 }
3668                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3669                                 sin.sin_family = AF_INET;
3670                                 sin.sin_len = sizeof(struct sockaddr_in);
3671                                 sin.sin_port = stcb->rport;
3672                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3673                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3674                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3675                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3676                                         *error = EINVAL;
3677                                         return (1);
3678                                 }
3679                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3680                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3681                                         *error = ENOBUFS;
3682                                         return (1);
3683                                 }
3684                                 break;
3685 #endif
3686 #ifdef INET6
3687                         case SCTP_DSTADDRV6:
3688                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3689                                         *error = EINVAL;
3690                                         return (1);
3691                                 }
3692                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3693                                 sin6.sin6_family = AF_INET6;
3694                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3695                                 sin6.sin6_port = stcb->rport;
3696                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3697                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3698                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3699                                         *error = EINVAL;
3700                                         return (1);
3701                                 }
3702 #ifdef INET
3703                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3704                                         in6_sin6_2_sin(&sin, &sin6);
3705                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3706                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3707                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3708                                                 *error = EINVAL;
3709                                                 return (1);
3710                                         }
3711                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3712                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3713                                                 *error = ENOBUFS;
3714                                                 return (1);
3715                                         }
3716                                 } else
3717 #endif
3718                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3719                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3720                                         *error = ENOBUFS;
3721                                         return (1);
3722                                 }
3723                                 break;
3724 #endif
3725                         default:
3726                                 break;
3727                         }
3728                 }
3729                 at += CMSG_ALIGN(cmh.cmsg_len);
3730         }
3731         return (0);
3732 }
3733
3734 static struct sctp_tcb *
3735 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3736     uint16_t port,
3737     struct mbuf *control,
3738     struct sctp_nets **net_p,
3739     int *error)
3740 {
3741         struct cmsghdr cmh;
3742         int tlen, at;
3743         struct sctp_tcb *stcb;
3744         struct sockaddr *addr;
3745
3746 #ifdef INET
3747         struct sockaddr_in sin;
3748
3749 #endif
3750 #ifdef INET6
3751         struct sockaddr_in6 sin6;
3752
3753 #endif
3754
3755         tlen = SCTP_BUF_LEN(control);
3756         at = 0;
3757         while (at < tlen) {
3758                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3759                         /* There is not enough room for one more. */
3760                         *error = EINVAL;
3761                         return (NULL);
3762                 }
3763                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3764                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3765                         /* We dont't have a complete CMSG header. */
3766                         *error = EINVAL;
3767                         return (NULL);
3768                 }
3769                 if (((int)cmh.cmsg_len + at) > tlen) {
3770                         /* We don't have the complete CMSG. */
3771                         *error = EINVAL;
3772                         return (NULL);
3773                 }
3774                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3775                         switch (cmh.cmsg_type) {
3776 #ifdef INET
3777                         case SCTP_DSTADDRV4:
3778                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3779                                         *error = EINVAL;
3780                                         return (NULL);
3781                                 }
3782                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3783                                 sin.sin_family = AF_INET;
3784                                 sin.sin_len = sizeof(struct sockaddr_in);
3785                                 sin.sin_port = port;
3786                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3787                                 addr = (struct sockaddr *)&sin;
3788                                 break;
3789 #endif
3790 #ifdef INET6
3791                         case SCTP_DSTADDRV6:
3792                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3793                                         *error = EINVAL;
3794                                         return (NULL);
3795                                 }
3796                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3797                                 sin6.sin6_family = AF_INET6;
3798                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3799                                 sin6.sin6_port = port;
3800                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3801 #ifdef INET
3802                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3803                                         in6_sin6_2_sin(&sin, &sin6);
3804                                         addr = (struct sockaddr *)&sin;
3805                                 } else
3806 #endif
3807                                         addr = (struct sockaddr *)&sin6;
3808                                 break;
3809 #endif
3810                         default:
3811                                 addr = NULL;
3812                                 break;
3813                         }
3814                         if (addr) {
3815                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3816                                 if (stcb != NULL) {
3817                                         return (stcb);
3818                                 }
3819                         }
3820                 }
3821                 at += CMSG_ALIGN(cmh.cmsg_len);
3822         }
3823         return (NULL);
3824 }
3825
3826 static struct mbuf *
3827 sctp_add_cookie(struct mbuf *init, int init_offset,
3828     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3829 {
3830         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3831         struct sctp_state_cookie *stc;
3832         struct sctp_paramhdr *ph;
3833         uint8_t *foo;
3834         int sig_offset;
3835         uint16_t cookie_sz;
3836
3837         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3838             sizeof(struct sctp_paramhdr)), 0,
3839             M_NOWAIT, 1, MT_DATA);
3840         if (mret == NULL) {
3841                 return (NULL);
3842         }
3843         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3844         if (copy_init == NULL) {
3845                 sctp_m_freem(mret);
3846                 return (NULL);
3847         }
3848 #ifdef SCTP_MBUF_LOGGING
3849         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3850                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3851         }
3852 #endif
3853         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3854             M_NOWAIT);
3855         if (copy_initack == NULL) {
3856                 sctp_m_freem(mret);
3857                 sctp_m_freem(copy_init);
3858                 return (NULL);
3859         }
3860 #ifdef SCTP_MBUF_LOGGING
3861         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3862                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3863         }
3864 #endif
3865         /* easy side we just drop it on the end */
3866         ph = mtod(mret, struct sctp_paramhdr *);
3867         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3868             sizeof(struct sctp_paramhdr);
3869         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3870             sizeof(struct sctp_paramhdr));
3871         ph->param_type = htons(SCTP_STATE_COOKIE);
3872         ph->param_length = 0;   /* fill in at the end */
3873         /* Fill in the stc cookie data */
3874         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3875
3876         /* tack the INIT and then the INIT-ACK onto the chain */
3877         cookie_sz = 0;
3878         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3879                 cookie_sz += SCTP_BUF_LEN(m_at);
3880                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3881                         SCTP_BUF_NEXT(m_at) = copy_init;
3882                         break;
3883                 }
3884         }
3885         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3886                 cookie_sz += SCTP_BUF_LEN(m_at);
3887                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3888                         SCTP_BUF_NEXT(m_at) = copy_initack;
3889                         break;
3890                 }
3891         }
3892         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3893                 cookie_sz += SCTP_BUF_LEN(m_at);
3894                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3895                         break;
3896                 }
3897         }
3898         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3899         if (sig == NULL) {
3900                 /* no space, so free the entire chain */
3901                 sctp_m_freem(mret);
3902                 return (NULL);
3903         }
3904         SCTP_BUF_LEN(sig) = 0;
3905         SCTP_BUF_NEXT(m_at) = sig;
3906         sig_offset = 0;
3907         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3908         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3909         *signature = foo;
3910         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3911         cookie_sz += SCTP_SIGNATURE_SIZE;
3912         ph->param_length = htons(cookie_sz);
3913         return (mret);
3914 }
3915
3916
3917 static uint8_t
3918 sctp_get_ect(struct sctp_tcb *stcb)
3919 {
3920         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3921                 return (SCTP_ECT0_BIT);
3922         } else {
3923                 return (0);
3924         }
3925 }
3926
3927 #if defined(INET) || defined(INET6)
3928 static void
3929 sctp_handle_no_route(struct sctp_tcb *stcb,
3930     struct sctp_nets *net,
3931     int so_locked)
3932 {
3933         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3934
3935         if (net) {
3936                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3937                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3938                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3939                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3940                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3941                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3942                                     stcb, 0,
3943                                     (void *)net,
3944                                     so_locked);
3945                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3946                                 net->dest_state &= ~SCTP_ADDR_PF;
3947                         }
3948                 }
3949                 if (stcb) {
3950                         if (net == stcb->asoc.primary_destination) {
3951                                 /* need a new primary */
3952                                 struct sctp_nets *alt;
3953
3954                                 alt = sctp_find_alternate_net(stcb, net, 0);
3955                                 if (alt != net) {
3956                                         if (stcb->asoc.alternate) {
3957                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3958                                         }
3959                                         stcb->asoc.alternate = alt;
3960                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3961                                         if (net->ro._s_addr) {
3962                                                 sctp_free_ifa(net->ro._s_addr);
3963                                                 net->ro._s_addr = NULL;
3964                                         }
3965                                         net->src_addr_selected = 0;
3966                                 }
3967                         }
3968                 }
3969         }
3970 }
3971
3972 #endif
3973
3974 static int
3975 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3976     struct sctp_tcb *stcb,      /* may be NULL */
3977     struct sctp_nets *net,
3978     struct sockaddr *to,
3979     struct mbuf *m,
3980     uint32_t auth_offset,
3981     struct sctp_auth_chunk *auth,
3982     uint16_t auth_keyid,
3983     int nofragment_flag,
3984     int ecn_ok,
3985     int out_of_asoc_ok,
3986     uint16_t src_port,
3987     uint16_t dest_port,
3988     uint32_t v_tag,
3989     uint16_t port,
3990     union sctp_sockstore *over_addr,
3991     uint8_t mflowtype, uint32_t mflowid,
3992 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3993     int so_locked SCTP_UNUSED
3994 #else
3995     int so_locked
3996 #endif
3997 )
3998 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3999 {
4000         /**
4001          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4002          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4003          * - fill in the HMAC digest of any AUTH chunk in the packet.
4004          * - calculate and fill in the SCTP checksum.
4005          * - prepend an IP address header.
4006          * - if boundall use INADDR_ANY.
4007          * - if boundspecific do source address selection.
4008          * - set fragmentation option for ipV4.
4009          * - On return from IP output, check/adjust mtu size of output
4010          *   interface and smallest_mtu size as well.
4011          */
4012         /* Will need ifdefs around this */
4013         struct mbuf *newm;
4014         struct sctphdr *sctphdr;
4015         int packet_length;
4016         int ret;
4017
4018 #if defined(INET) || defined(INET6)
4019         uint32_t vrf_id;
4020
4021 #endif
4022 #if defined(INET) || defined(INET6)
4023         struct mbuf *o_pak;
4024         sctp_route_t *ro = NULL;
4025         struct udphdr *udp = NULL;
4026
4027 #endif
4028         uint8_t tos_value;
4029
4030 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4031         struct socket *so = NULL;
4032
4033 #endif
4034
4035         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4036                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4037                 sctp_m_freem(m);
4038                 return (EFAULT);
4039         }
4040 #if defined(INET) || defined(INET6)
4041         if (stcb) {
4042                 vrf_id = stcb->asoc.vrf_id;
4043         } else {
4044                 vrf_id = inp->def_vrf_id;
4045         }
4046 #endif
4047         /* fill in the HMAC digest for any AUTH chunk in the packet */
4048         if ((auth != NULL) && (stcb != NULL)) {
4049                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4050         }
4051         if (net) {
4052                 tos_value = net->dscp;
4053         } else if (stcb) {
4054                 tos_value = stcb->asoc.default_dscp;
4055         } else {
4056                 tos_value = inp->sctp_ep.default_dscp;
4057         }
4058
4059         switch (to->sa_family) {
4060 #ifdef INET
4061         case AF_INET:
4062                 {
4063                         struct ip *ip = NULL;
4064                         sctp_route_t iproute;
4065                         int len;
4066
4067                         len = SCTP_MIN_V4_OVERHEAD;
4068                         if (port) {
4069                                 len += sizeof(struct udphdr);
4070                         }
4071                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4072                         if (newm == NULL) {
4073                                 sctp_m_freem(m);
4074                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4075                                 return (ENOMEM);
4076                         }
4077                         SCTP_ALIGN_TO_END(newm, len);
4078                         SCTP_BUF_LEN(newm) = len;
4079                         SCTP_BUF_NEXT(newm) = m;
4080                         m = newm;
4081                         if (net != NULL) {
4082                                 m->m_pkthdr.flowid = net->flowid;
4083                                 M_HASHTYPE_SET(m, net->flowtype);
4084                         } else {
4085                                 m->m_pkthdr.flowid = mflowid;
4086                                 M_HASHTYPE_SET(m, mflowtype);
4087                         }
4088                         packet_length = sctp_calculate_len(m);
4089                         ip = mtod(m, struct ip *);
4090                         ip->ip_v = IPVERSION;
4091                         ip->ip_hl = (sizeof(struct ip) >> 2);
4092                         if (tos_value == 0) {
4093                                 /*
4094                                  * This means especially, that it is not set
4095                                  * at the SCTP layer. So use the value from
4096                                  * the IP layer.
4097                                  */
4098                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4099                         }
4100                         tos_value &= 0xfc;
4101                         if (ecn_ok) {
4102                                 tos_value |= sctp_get_ect(stcb);
4103                         }
4104                         if ((nofragment_flag) && (port == 0)) {
4105                                 ip->ip_off = htons(IP_DF);
4106                         } else {
4107                                 ip->ip_off = htons(0);
4108                         }
4109                         /* FreeBSD has a function for ip_id's */
4110                         ip->ip_id = ip_newid();
4111
4112                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4113                         ip->ip_len = htons(packet_length);
4114                         ip->ip_tos = tos_value;
4115                         if (port) {
4116                                 ip->ip_p = IPPROTO_UDP;
4117                         } else {
4118                                 ip->ip_p = IPPROTO_SCTP;
4119                         }
4120                         ip->ip_sum = 0;
4121                         if (net == NULL) {
4122                                 ro = &iproute;
4123                                 memset(&iproute, 0, sizeof(iproute));
4124                                 memcpy(&ro->ro_dst, to, to->sa_len);
4125                         } else {
4126                                 ro = (sctp_route_t *) & net->ro;
4127                         }
4128                         /* Now the address selection part */
4129                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4130
4131                         /* call the routine to select the src address */
4132                         if (net && out_of_asoc_ok == 0) {
4133                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4134                                         sctp_free_ifa(net->ro._s_addr);
4135                                         net->ro._s_addr = NULL;
4136                                         net->src_addr_selected = 0;
4137                                         if (ro->ro_rt) {
4138                                                 RTFREE(ro->ro_rt);
4139                                                 ro->ro_rt = NULL;
4140                                         }
4141                                 }
4142                                 if (net->src_addr_selected == 0) {
4143                                         /* Cache the source address */
4144                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4145                                             ro, net, 0,
4146                                             vrf_id);
4147                                         net->src_addr_selected = 1;
4148                                 }
4149                                 if (net->ro._s_addr == NULL) {
4150                                         /* No route to host */
4151                                         net->src_addr_selected = 0;
4152                                         sctp_handle_no_route(stcb, net, so_locked);
4153                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4154                                         sctp_m_freem(m);
4155                                         return (EHOSTUNREACH);
4156                                 }
4157                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4158                         } else {
4159                                 if (over_addr == NULL) {
4160                                         struct sctp_ifa *_lsrc;
4161
4162                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4163                                             net,
4164                                             out_of_asoc_ok,
4165                                             vrf_id);
4166                                         if (_lsrc == NULL) {
4167                                                 sctp_handle_no_route(stcb, net, so_locked);
4168                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4169                                                 sctp_m_freem(m);
4170                                                 return (EHOSTUNREACH);
4171                                         }
4172                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4173                                         sctp_free_ifa(_lsrc);
4174                                 } else {
4175                                         ip->ip_src = over_addr->sin.sin_addr;
4176                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4177                                 }
4178                         }
4179                         if (port) {
4180                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4181                                         sctp_handle_no_route(stcb, net, so_locked);
4182                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4183                                         sctp_m_freem(m);
4184                                         return (EHOSTUNREACH);
4185                                 }
4186                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4187                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4188                                 udp->uh_dport = port;
4189                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4190                                 if (V_udp_cksum) {
4191                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4192                                 } else {
4193                                         udp->uh_sum = 0;
4194                                 }
4195                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4196                         } else {
4197                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4198                         }
4199
4200                         sctphdr->src_port = src_port;
4201                         sctphdr->dest_port = dest_port;
4202                         sctphdr->v_tag = v_tag;
4203                         sctphdr->checksum = 0;
4204
4205                         /*
4206                          * If source address selection fails and we find no
4207                          * route then the ip_output should fail as well with
4208                          * a NO_ROUTE_TO_HOST type error. We probably should
4209                          * catch that somewhere and abort the association
4210                          * right away (assuming this is an INIT being sent).
4211                          */
4212                         if (ro->ro_rt == NULL) {
4213                                 /*
4214                                  * src addr selection failed to find a route
4215                                  * (or valid source addr), so we can't get
4216                                  * there from here (yet)!
4217                                  */
4218                                 sctp_handle_no_route(stcb, net, so_locked);
4219                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4220                                 sctp_m_freem(m);
4221                                 return (EHOSTUNREACH);
4222                         }
4223                         if (ro != &iproute) {
4224                                 memcpy(&iproute, ro, sizeof(*ro));
4225                         }
4226                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4227                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4228                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4229                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4230                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4231                             (void *)ro->ro_rt);
4232
4233                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4234                                 /* failed to prepend data, give up */
4235                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4236                                 sctp_m_freem(m);
4237                                 return (ENOMEM);
4238                         }
4239                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4240                         if (port) {
4241 #if defined(SCTP_WITH_NO_CSUM)
4242                                 SCTP_STAT_INCR(sctps_sendnocrc);
4243 #else
4244                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4245                                 SCTP_STAT_INCR(sctps_sendswcrc);
4246 #endif
4247                                 if (V_udp_cksum) {
4248                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4249                                 }
4250                         } else {
4251 #if defined(SCTP_WITH_NO_CSUM)
4252                                 SCTP_STAT_INCR(sctps_sendnocrc);
4253 #else
4254                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4255                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4256                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4257 #endif
4258                         }
4259 #ifdef SCTP_PACKET_LOGGING
4260                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4261                                 sctp_packet_log(o_pak);
4262 #endif
4263                         /* send it out.  table id is taken from stcb */
4264 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4265                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4266                                 so = SCTP_INP_SO(inp);
4267                                 SCTP_SOCKET_UNLOCK(so, 0);
4268                         }
4269 #endif
4270                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4271 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4272                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4273                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4274                                 SCTP_TCB_UNLOCK(stcb);
4275                                 SCTP_SOCKET_LOCK(so, 0);
4276                                 SCTP_TCB_LOCK(stcb);
4277                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4278                         }
4279 #endif
4280                         SCTP_STAT_INCR(sctps_sendpackets);
4281                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4282                         if (ret)
4283                                 SCTP_STAT_INCR(sctps_senderrors);
4284
4285                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4286                         if (net == NULL) {
4287                                 /* free tempy routes */
4288                                 RO_RTFREE(ro);
4289                         } else {
4290                                 /*
4291                                  * PMTU check versus smallest asoc MTU goes
4292                                  * here
4293                                  */
4294                                 if ((ro->ro_rt != NULL) &&
4295                                     (net->ro._s_addr)) {
4296                                         uint32_t mtu;
4297
4298                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4299                                         if (net->port) {
4300                                                 mtu -= sizeof(struct udphdr);
4301                                         }
4302                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4303                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4304                                                 net->mtu = mtu;
4305                                         }
4306                                 } else if (ro->ro_rt == NULL) {
4307                                         /* route was freed */
4308                                         if (net->ro._s_addr &&
4309                                             net->src_addr_selected) {
4310                                                 sctp_free_ifa(net->ro._s_addr);
4311                                                 net->ro._s_addr = NULL;
4312                                         }
4313                                         net->src_addr_selected = 0;
4314                                 }
4315                         }
4316                         return (ret);
4317                 }
4318 #endif
4319 #ifdef INET6
4320         case AF_INET6:
4321                 {
4322                         uint32_t flowlabel, flowinfo;
4323                         struct ip6_hdr *ip6h;
4324                         struct route_in6 ip6route;
4325                         struct ifnet *ifp;
4326                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4327                         int prev_scope = 0;
4328                         struct sockaddr_in6 lsa6_storage;
4329                         int error;
4330                         u_short prev_port = 0;
4331                         int len;
4332
4333                         if (net) {
4334                                 flowlabel = net->flowlabel;
4335                         } else if (stcb) {
4336                                 flowlabel = stcb->asoc.default_flowlabel;
4337                         } else {
4338                                 flowlabel = inp->sctp_ep.default_flowlabel;
4339                         }
4340                         if (flowlabel == 0) {
4341                                 /*
4342                                  * This means especially, that it is not set
4343                                  * at the SCTP layer. So use the value from
4344                                  * the IP layer.
4345                                  */
4346                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4347                         }
4348                         flowlabel &= 0x000fffff;
4349                         len = SCTP_MIN_OVERHEAD;
4350                         if (port) {
4351                                 len += sizeof(struct udphdr);
4352                         }
4353                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4354                         if (newm == NULL) {
4355                                 sctp_m_freem(m);
4356                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4357                                 return (ENOMEM);
4358                         }
4359                         SCTP_ALIGN_TO_END(newm, len);
4360                         SCTP_BUF_LEN(newm) = len;
4361                         SCTP_BUF_NEXT(newm) = m;
4362                         m = newm;
4363                         if (net != NULL) {
4364                                 m->m_pkthdr.flowid = net->flowid;
4365                                 M_HASHTYPE_SET(m, net->flowtype);
4366                         } else {
4367                                 m->m_pkthdr.flowid = mflowid;
4368                                 M_HASHTYPE_SET(m, mflowtype);
4369                         }
4370                         packet_length = sctp_calculate_len(m);
4371
4372                         ip6h = mtod(m, struct ip6_hdr *);
4373                         /* protect *sin6 from overwrite */
4374                         sin6 = (struct sockaddr_in6 *)to;
4375                         tmp = *sin6;
4376                         sin6 = &tmp;
4377
4378                         /* KAME hack: embed scopeid */
4379                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4380                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4381                                 return (EINVAL);
4382                         }
4383                         if (net == NULL) {
4384                                 memset(&ip6route, 0, sizeof(ip6route));
4385                                 ro = (sctp_route_t *) & ip6route;
4386                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4387                         } else {
4388                                 ro = (sctp_route_t *) & net->ro;
4389                         }
4390                         /*
4391                          * We assume here that inp_flow is in host byte
4392                          * order within the TCB!
4393                          */
4394                         if (tos_value == 0) {
4395                                 /*
4396                                  * This means especially, that it is not set
4397                                  * at the SCTP layer. So use the value from
4398                                  * the IP layer.
4399                                  */
4400                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4401                         }
4402                         tos_value &= 0xfc;
4403                         if (ecn_ok) {
4404                                 tos_value |= sctp_get_ect(stcb);
4405                         }
4406                         flowinfo = 0x06;
4407                         flowinfo <<= 8;
4408                         flowinfo |= tos_value;
4409                         flowinfo <<= 20;
4410                         flowinfo |= flowlabel;
4411                         ip6h->ip6_flow = htonl(flowinfo);
4412                         if (port) {
4413                                 ip6h->ip6_nxt = IPPROTO_UDP;
4414                         } else {
4415                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4416                         }
4417                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4418                         ip6h->ip6_dst = sin6->sin6_addr;
4419
4420                         /*
4421                          * Add SRC address selection here: we can only reuse
4422                          * to a limited degree the kame src-addr-sel, since
4423                          * we can try their selection but it may not be
4424                          * bound.
4425                          */
4426                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4427                         lsa6_tmp.sin6_family = AF_INET6;
4428                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4429                         lsa6 = &lsa6_tmp;
4430                         if (net && out_of_asoc_ok == 0) {
4431                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4432                                         sctp_free_ifa(net->ro._s_addr);
4433                                         net->ro._s_addr = NULL;
4434                                         net->src_addr_selected = 0;
4435                                         if (ro->ro_rt) {
4436                                                 RTFREE(ro->ro_rt);
4437                                                 ro->ro_rt = NULL;
4438                                         }
4439                                 }
4440                                 if (net->src_addr_selected == 0) {
4441                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4442                                         /* KAME hack: embed scopeid */
4443                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4444                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4445                                                 return (EINVAL);
4446                                         }
4447                                         /* Cache the source address */
4448                                         net->ro._s_addr = sctp_source_address_selection(inp,
4449                                             stcb,
4450                                             ro,
4451                                             net,
4452                                             0,
4453                                             vrf_id);
4454                                         (void)sa6_recoverscope(sin6);
4455                                         net->src_addr_selected = 1;
4456                                 }
4457                                 if (net->ro._s_addr == NULL) {
4458                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4459                                         net->src_addr_selected = 0;
4460                                         sctp_handle_no_route(stcb, net, so_locked);
4461                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4462                                         sctp_m_freem(m);
4463                                         return (EHOSTUNREACH);
4464                                 }
4465                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4466                         } else {
4467                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4468                                 /* KAME hack: embed scopeid */
4469                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4470                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4471                                         return (EINVAL);
4472                                 }
4473                                 if (over_addr == NULL) {
4474                                         struct sctp_ifa *_lsrc;
4475
4476                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4477                                             net,
4478                                             out_of_asoc_ok,
4479                                             vrf_id);
4480                                         if (_lsrc == NULL) {
4481                                                 sctp_handle_no_route(stcb, net, so_locked);
4482                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4483                                                 sctp_m_freem(m);
4484                                                 return (EHOSTUNREACH);
4485                                         }
4486                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4487                                         sctp_free_ifa(_lsrc);
4488                                 } else {
4489                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4490                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4491                                 }
4492                                 (void)sa6_recoverscope(sin6);
4493                         }
4494                         lsa6->sin6_port = inp->sctp_lport;
4495
4496                         if (ro->ro_rt == NULL) {
4497                                 /*
4498                                  * src addr selection failed to find a route
4499                                  * (or valid source addr), so we can't get
4500                                  * there from here!
4501                                  */
4502                                 sctp_handle_no_route(stcb, net, so_locked);
4503                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4504                                 sctp_m_freem(m);
4505                                 return (EHOSTUNREACH);
4506                         }
4507                         /*
4508                          * XXX: sa6 may not have a valid sin6_scope_id in
4509                          * the non-SCOPEDROUTING case.
4510                          */
4511                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4512                         lsa6_storage.sin6_family = AF_INET6;
4513                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4514                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4515                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4516                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4517                                 sctp_m_freem(m);
4518                                 return (error);
4519                         }
4520                         /* XXX */
4521                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4522                         lsa6_storage.sin6_port = inp->sctp_lport;
4523                         lsa6 = &lsa6_storage;
4524                         ip6h->ip6_src = lsa6->sin6_addr;
4525
4526                         if (port) {
4527                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4528                                         sctp_handle_no_route(stcb, net, so_locked);
4529                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4530                                         sctp_m_freem(m);
4531                                         return (EHOSTUNREACH);
4532                                 }
4533                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4534                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4535                                 udp->uh_dport = port;
4536                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4537                                 udp->uh_sum = 0;
4538                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4539                         } else {
4540                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4541                         }
4542
4543                         sctphdr->src_port = src_port;
4544                         sctphdr->dest_port = dest_port;
4545                         sctphdr->v_tag = v_tag;
4546                         sctphdr->checksum = 0;
4547
4548                         /*
4549                          * We set the hop limit now since there is a good
4550                          * chance that our ro pointer is now filled
4551                          */
4552                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4553                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4554
4555 #ifdef SCTP_DEBUG
4556                         /* Copy to be sure something bad is not happening */
4557                         sin6->sin6_addr = ip6h->ip6_dst;
4558                         lsa6->sin6_addr = ip6h->ip6_src;
4559 #endif
4560
4561                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4562                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4563                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4564                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4565                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4566                         if (net) {
4567                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4568                                 /*
4569                                  * preserve the port and scope for link
4570                                  * local send
4571                                  */
4572                                 prev_scope = sin6->sin6_scope_id;
4573                                 prev_port = sin6->sin6_port;
4574                         }
4575                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4576                                 /* failed to prepend data, give up */
4577                                 sctp_m_freem(m);
4578                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4579                                 return (ENOMEM);
4580                         }
4581                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4582                         if (port) {
4583 #if defined(SCTP_WITH_NO_CSUM)
4584                                 SCTP_STAT_INCR(sctps_sendnocrc);
4585 #else
4586                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4587                                 SCTP_STAT_INCR(sctps_sendswcrc);
4588 #endif
4589                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4590                                         udp->uh_sum = 0xffff;
4591                                 }
4592                         } else {
4593 #if defined(SCTP_WITH_NO_CSUM)
4594                                 SCTP_STAT_INCR(sctps_sendnocrc);
4595 #else
4596                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4597                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4598                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4599 #endif
4600                         }
4601                         /* send it out. table id is taken from stcb */
4602 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4603                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4604                                 so = SCTP_INP_SO(inp);
4605                                 SCTP_SOCKET_UNLOCK(so, 0);
4606                         }
4607 #endif
4608 #ifdef SCTP_PACKET_LOGGING
4609                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4610                                 sctp_packet_log(o_pak);
4611 #endif
4612                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4613 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4614                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4615                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4616                                 SCTP_TCB_UNLOCK(stcb);
4617                                 SCTP_SOCKET_LOCK(so, 0);
4618                                 SCTP_TCB_LOCK(stcb);
4619                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4620                         }
4621 #endif
4622                         if (net) {
4623                                 /* for link local this must be done */
4624                                 sin6->sin6_scope_id = prev_scope;
4625                                 sin6->sin6_port = prev_port;
4626                         }
4627                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4628                         SCTP_STAT_INCR(sctps_sendpackets);
4629                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4630                         if (ret) {
4631                                 SCTP_STAT_INCR(sctps_senderrors);
4632                         }
4633                         if (net == NULL) {
4634                                 /* Now if we had a temp route free it */
4635                                 RO_RTFREE(ro);
4636                         } else {
4637                                 /*
4638                                  * PMTU check versus smallest asoc MTU goes
4639                                  * here
4640                                  */
4641                                 if (ro->ro_rt == NULL) {
4642                                         /* Route was freed */
4643                                         if (net->ro._s_addr &&
4644                                             net->src_addr_selected) {
4645                                                 sctp_free_ifa(net->ro._s_addr);
4646                                                 net->ro._s_addr = NULL;
4647                                         }
4648                                         net->src_addr_selected = 0;
4649                                 }
4650                                 if ((ro->ro_rt != NULL) &&
4651                                     (net->ro._s_addr)) {
4652                                         uint32_t mtu;
4653
4654                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4655                                         if (mtu &&
4656                                             (stcb->asoc.smallest_mtu > mtu)) {
4657                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4658                                                 net->mtu = mtu;
4659                                                 if (net->port) {
4660                                                         net->mtu -= sizeof(struct udphdr);
4661                                                 }
4662                                         }
4663                                 } else if (ifp) {
4664                                         if (ND_IFINFO(ifp)->linkmtu &&
4665                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4666                                                 sctp_mtu_size_reset(inp,
4667                                                     &stcb->asoc,
4668                                                     ND_IFINFO(ifp)->linkmtu);
4669                                         }
4670                                 }
4671                         }
4672                         return (ret);
4673                 }
4674 #endif
4675         default:
4676                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4677                     ((struct sockaddr *)to)->sa_family);
4678                 sctp_m_freem(m);
4679                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4680                 return (EFAULT);
4681         }
4682 }
4683
4684
4685 void
4686 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4687 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4688     SCTP_UNUSED
4689 #endif
4690 )
4691 {
4692         struct mbuf *m, *m_last;
4693         struct sctp_nets *net;
4694         struct sctp_init_chunk *init;
4695         struct sctp_supported_addr_param *sup_addr;
4696         struct sctp_adaptation_layer_indication *ali;
4697         struct sctp_supported_chunk_types_param *pr_supported;
4698         struct sctp_paramhdr *ph;
4699         int cnt_inits_to = 0;
4700         int ret;
4701         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4702
4703         /* INIT's always go to the primary (and usually ONLY address) */
4704         net = stcb->asoc.primary_destination;
4705         if (net == NULL) {
4706                 net = TAILQ_FIRST(&stcb->asoc.nets);
4707                 if (net == NULL) {
4708                         /* TSNH */
4709                         return;
4710                 }
4711                 /* we confirm any address we send an INIT to */
4712                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4713                 (void)sctp_set_primary_addr(stcb, NULL, net);
4714         } else {
4715                 /* we confirm any address we send an INIT to */
4716                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4717         }
4718         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4719 #ifdef INET6
4720         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4721                 /*
4722                  * special hook, if we are sending to link local it will not
4723                  * show up in our private address count.
4724                  */
4725                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4726                         cnt_inits_to = 1;
4727         }
4728 #endif
4729         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4730                 /* This case should not happen */
4731                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4732                 return;
4733         }
4734         /* start the INIT timer */
4735         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4736
4737         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4738         if (m == NULL) {
4739                 /* No memory, INIT timer will re-attempt. */
4740                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4741                 return;
4742         }
4743         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4744         padding_len = 0;
4745         /* Now lets put the chunk header in place */
4746         init = mtod(m, struct sctp_init_chunk *);
4747         /* now the chunk header */
4748         init->ch.chunk_type = SCTP_INITIATION;
4749         init->ch.chunk_flags = 0;
4750         /* fill in later from mbuf we build */
4751         init->ch.chunk_length = 0;
4752         /* place in my tag */
4753         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4754         /* set up some of the credits. */
4755         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4756             SCTP_MINIMAL_RWND));
4757         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4758         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4759         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4760
4761         /* Adaptation layer indication parameter */
4762         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4763                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4764                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4765                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4766                 ali->ph.param_length = htons(parameter_len);
4767                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4768                 chunk_len += parameter_len;
4769         }
4770         /* ECN parameter */
4771         if (stcb->asoc.ecn_supported == 1) {
4772                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4773                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4774                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4775                 ph->param_length = htons(parameter_len);
4776                 chunk_len += parameter_len;
4777         }
4778         /* PR-SCTP supported parameter */
4779         if (stcb->asoc.prsctp_supported == 1) {
4780                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4781                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4782                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4783                 ph->param_length = htons(parameter_len);
4784                 chunk_len += parameter_len;
4785         }
4786         /* Add NAT friendly parameter. */
4787         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4788                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4789                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4790                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4791                 ph->param_length = htons(parameter_len);
4792                 chunk_len += parameter_len;
4793         }
4794         /* And now tell the peer which extensions we support */
4795         num_ext = 0;
4796         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4797         if (stcb->asoc.prsctp_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4799         }
4800         if (stcb->asoc.auth_supported == 1) {
4801                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4802         }
4803         if (stcb->asoc.asconf_supported == 1) {
4804                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4805                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4806         }
4807         if (stcb->asoc.reconfig_supported == 1) {
4808                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4809         }
4810         if (stcb->asoc.nrsack_supported == 1) {
4811                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4812         }
4813         if (stcb->asoc.pktdrop_supported == 1) {
4814                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4815         }
4816         if (num_ext > 0) {
4817                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4818                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4819                 pr_supported->ph.param_length = htons(parameter_len);
4820                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4821                 chunk_len += parameter_len;
4822         }
4823         /* add authentication parameters */
4824         if (stcb->asoc.auth_supported) {
4825                 /* attach RANDOM parameter, if available */
4826                 if (stcb->asoc.authinfo.random != NULL) {
4827                         struct sctp_auth_random *randp;
4828
4829                         if (padding_len > 0) {
4830                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4831                                 chunk_len += padding_len;
4832                                 padding_len = 0;
4833                         }
4834                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4835                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4836                         /* random key already contains the header */
4837                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4838                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4839                         chunk_len += parameter_len;
4840                 }
4841                 /* add HMAC_ALGO parameter */
4842                 if (stcb->asoc.local_hmacs != NULL) {
4843                         struct sctp_auth_hmac_algo *hmacs;
4844
4845                         if (padding_len > 0) {
4846                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4847                                 chunk_len += padding_len;
4848                                 padding_len = 0;
4849                         }
4850                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4851                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4852                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4853                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4854                         hmacs->ph.param_length = htons(parameter_len);
4855                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4856                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4857                         chunk_len += parameter_len;
4858                 }
4859                 /* add CHUNKS parameter */
4860                 if (stcb->asoc.local_auth_chunks != NULL) {
4861                         struct sctp_auth_chunk_list *chunks;
4862
4863                         if (padding_len > 0) {
4864                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4865                                 chunk_len += padding_len;
4866                                 padding_len = 0;
4867                         }
4868                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4869                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4870                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4871                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4872                         chunks->ph.param_length = htons(parameter_len);
4873                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4874                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4875                         chunk_len += parameter_len;
4876                 }
4877         }
4878         /* now any cookie time extensions */
4879         if (stcb->asoc.cookie_preserve_req) {
4880                 struct sctp_cookie_perserve_param *cookie_preserve;
4881
4882                 if (padding_len > 0) {
4883                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4884                         chunk_len += padding_len;
4885                         padding_len = 0;
4886                 }
4887                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4888                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4889                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4890                 cookie_preserve->ph.param_length = htons(parameter_len);
4891                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4892                 stcb->asoc.cookie_preserve_req = 0;
4893                 chunk_len += parameter_len;
4894         }
4895         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4896                 uint8_t i;
4897
4898                 if (padding_len > 0) {
4899                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4900                         chunk_len += padding_len;
4901                         padding_len = 0;
4902                 }
4903                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4904                 if (stcb->asoc.scope.ipv4_addr_legal) {
4905                         parameter_len += (uint16_t) sizeof(uint16_t);
4906                 }
4907                 if (stcb->asoc.scope.ipv6_addr_legal) {
4908                         parameter_len += (uint16_t) sizeof(uint16_t);
4909                 }
4910                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4911                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4912                 sup_addr->ph.param_length = htons(parameter_len);
4913                 i = 0;
4914                 if (stcb->asoc.scope.ipv4_addr_legal) {
4915                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4916                 }
4917                 if (stcb->asoc.scope.ipv6_addr_legal) {
4918                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4919                 }
4920                 padding_len = 4 - 2 * i;
4921                 chunk_len += parameter_len;
4922         }
4923         SCTP_BUF_LEN(m) = chunk_len;
4924         /* now the addresses */
4925         /*
4926          * To optimize this we could put the scoping stuff into a structure
4927          * and remove the individual uint8's from the assoc structure. Then
4928          * we could just sifa in the address within the stcb. But for now
4929          * this is a quick hack to get the address stuff teased apart.
4930          */
4931         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4932             m, cnt_inits_to,
4933             &padding_len, &chunk_len);
4934
4935         init->ch.chunk_length = htons(chunk_len);
4936         if (padding_len > 0) {
4937                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4938                         sctp_m_freem(m);
4939                         return;
4940                 }
4941         }
4942         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4943         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4944             (struct sockaddr *)&net->ro._l_addr,
4945             m, 0, NULL, 0, 0, 0, 0,
4946             inp->sctp_lport, stcb->rport, htonl(0),
4947             net->port, NULL,
4948             0, 0,
4949             so_locked);
4950         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4951         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4952         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4953 }
4954
4955 struct mbuf *
4956 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4957     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4958 {
4959         /*
4960          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4961          * being equal to the beginning of the params i.e. (iphlen +
4962          * sizeof(struct sctp_init_msg) parse through the parameters to the
4963          * end of the mbuf verifying that all parameters are known.
4964          *
4965          * For unknown parameters build and return a mbuf with
4966          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4967          * processing this chunk stop, and set *abort_processing to 1.
4968          *
4969          * By having param_offset be pre-set to where parameters begin it is
4970          * hoped that this routine may be reused in the future by new
4971          * features.
4972          */
4973         struct sctp_paramhdr *phdr, params;
4974
4975         struct mbuf *mat, *op_err;
4976         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4977         int at, limit, pad_needed;
4978         uint16_t ptype, plen, padded_size;
4979         int err_at;
4980
4981         *abort_processing = 0;
4982         mat = in_initpkt;
4983         err_at = 0;
4984         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4985         at = param_offset;
4986         op_err = NULL;
4987         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4988         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4989         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4990                 ptype = ntohs(phdr->param_type);
4991                 plen = ntohs(phdr->param_length);
4992                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4993                         /* wacked parameter */
4994                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4995                         goto invalid_size;
4996                 }
4997                 limit -= SCTP_SIZE32(plen);
4998                 /*-
4999                  * All parameters for all chunks that we know/understand are
5000                  * listed here. We process them other places and make
5001                  * appropriate stop actions per the upper bits. However this
5002                  * is the generic routine processor's can call to get back
5003                  * an operr.. to either incorporate (init-ack) or send.
5004                  */
5005                 padded_size = SCTP_SIZE32(plen);
5006                 switch (ptype) {
5007                         /* Param's with variable size */
5008                 case SCTP_HEARTBEAT_INFO:
5009                 case SCTP_STATE_COOKIE:
5010                 case SCTP_UNRECOG_PARAM:
5011                 case SCTP_ERROR_CAUSE_IND:
5012                         /* ok skip fwd */
5013                         at += padded_size;
5014                         break;
5015                         /* Param's with variable size within a range */
5016                 case SCTP_CHUNK_LIST:
5017                 case SCTP_SUPPORTED_CHUNK_EXT:
5018                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5019                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5020                                 goto invalid_size;
5021                         }
5022                         at += padded_size;
5023                         break;
5024                 case SCTP_SUPPORTED_ADDRTYPE:
5025                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5026                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5027                                 goto invalid_size;
5028                         }
5029                         at += padded_size;
5030                         break;
5031                 case SCTP_RANDOM:
5032                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5033                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5034                                 goto invalid_size;
5035                         }
5036                         at += padded_size;
5037                         break;
5038                 case SCTP_SET_PRIM_ADDR:
5039                 case SCTP_DEL_IP_ADDRESS:
5040                 case SCTP_ADD_IP_ADDRESS:
5041                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5042                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5043                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5044                                 goto invalid_size;
5045                         }
5046                         at += padded_size;
5047                         break;
5048                         /* Param's with a fixed size */
5049                 case SCTP_IPV4_ADDRESS:
5050                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5051                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5052                                 goto invalid_size;
5053                         }
5054                         at += padded_size;
5055                         break;
5056                 case SCTP_IPV6_ADDRESS:
5057                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5058                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5059                                 goto invalid_size;
5060                         }
5061                         at += padded_size;
5062                         break;
5063                 case SCTP_COOKIE_PRESERVE:
5064                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5065                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5066                                 goto invalid_size;
5067                         }
5068                         at += padded_size;
5069                         break;
5070                 case SCTP_HAS_NAT_SUPPORT:
5071                         *nat_friendly = 1;
5072                         /* fall through */
5073                 case SCTP_PRSCTP_SUPPORTED:
5074                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5075                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5076                                 goto invalid_size;
5077                         }
5078                         at += padded_size;
5079                         break;
5080                 case SCTP_ECN_CAPABLE:
5081                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5082                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5083                                 goto invalid_size;
5084                         }
5085                         at += padded_size;
5086                         break;
5087                 case SCTP_ULP_ADAPTATION:
5088                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5089                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5090                                 goto invalid_size;
5091                         }
5092                         at += padded_size;
5093                         break;
5094                 case SCTP_SUCCESS_REPORT:
5095                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5096                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5097                                 goto invalid_size;
5098                         }
5099                         at += padded_size;
5100                         break;
5101                 case SCTP_HOSTNAME_ADDRESS:
5102                         {
5103                                 /* We can NOT handle HOST NAME addresses!! */
5104                                 int l_len;
5105
5106                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5107                                 *abort_processing = 1;
5108                                 if (op_err == NULL) {
5109                                         /* Ok need to try to get a mbuf */
5110 #ifdef INET6
5111                                         l_len = SCTP_MIN_OVERHEAD;
5112 #else
5113                                         l_len = SCTP_MIN_V4_OVERHEAD;
5114 #endif
5115                                         l_len += sizeof(struct sctp_chunkhdr);
5116                                         l_len += plen;
5117                                         l_len += sizeof(struct sctp_paramhdr);
5118                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5119                                         if (op_err) {
5120                                                 SCTP_BUF_LEN(op_err) = 0;
5121                                                 /*
5122                                                  * pre-reserve space for ip
5123                                                  * and sctp header  and
5124                                                  * chunk hdr
5125                                                  */
5126 #ifdef INET6
5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5128 #else
5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5130 #endif
5131                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5132                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5133                                         }
5134                                 }
5135                                 if (op_err) {
5136                                         /* If we have space */
5137                                         struct sctp_paramhdr s;
5138
5139                                         if (err_at % 4) {
5140                                                 uint32_t cpthis = 0;
5141
5142                                                 pad_needed = 4 - (err_at % 4);
5143                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5144                                                 err_at += pad_needed;
5145                                         }
5146                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5147                                         s.param_length = htons(sizeof(s) + plen);
5148                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5149                                         err_at += sizeof(s);
5150                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5151                                         if (phdr == NULL) {
5152                                                 sctp_m_freem(op_err);
5153                                                 /*
5154                                                  * we are out of memory but
5155                                                  * we still need to have a
5156                                                  * look at what to do (the
5157                                                  * system is in trouble
5158                                                  * though).
5159                                                  */
5160                                                 return (NULL);
5161                                         }
5162                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5163                                 }
5164                                 return (op_err);
5165                                 break;
5166                         }
5167                 default:
5168                         /*
5169                          * we do not recognize the parameter figure out what
5170                          * we do.
5171                          */
5172                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5173                         if ((ptype & 0x4000) == 0x4000) {
5174                                 /* Report bit is set?? */
5175                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5176                                 if (op_err == NULL) {
5177                                         int l_len;
5178
5179                                         /* Ok need to try to get an mbuf */
5180 #ifdef INET6
5181                                         l_len = SCTP_MIN_OVERHEAD;
5182 #else
5183                                         l_len = SCTP_MIN_V4_OVERHEAD;
5184 #endif
5185                                         l_len += sizeof(struct sctp_chunkhdr);
5186                                         l_len += plen;
5187                                         l_len += sizeof(struct sctp_paramhdr);
5188                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5189                                         if (op_err) {
5190                                                 SCTP_BUF_LEN(op_err) = 0;
5191 #ifdef INET6
5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5193 #else
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5195 #endif
5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5197                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5198                                         }
5199                                 }
5200                                 if (op_err) {
5201                                         /* If we have space */
5202                                         struct sctp_paramhdr s;
5203
5204                                         if (err_at % 4) {
5205                                                 uint32_t cpthis = 0;
5206
5207                                                 pad_needed = 4 - (err_at % 4);
5208                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5209                                                 err_at += pad_needed;
5210                                         }
5211                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5212                                         s.param_length = htons(sizeof(s) + plen);
5213                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5214                                         err_at += sizeof(s);
5215                                         if (plen > sizeof(tempbuf)) {
5216                                                 plen = sizeof(tempbuf);
5217                                         }
5218                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5219                                         if (phdr == NULL) {
5220                                                 sctp_m_freem(op_err);
5221                                                 /*
5222                                                  * we are out of memory but
5223                                                  * we still need to have a
5224                                                  * look at what to do (the
5225                                                  * system is in trouble
5226                                                  * though).
5227                                                  */
5228                                                 op_err = NULL;
5229                                                 goto more_processing;
5230                                         }
5231                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5232                                         err_at += plen;
5233                                 }
5234                         }
5235         more_processing:
5236                         if ((ptype & 0x8000) == 0x0000) {
5237                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5238                                 return (op_err);
5239                         } else {
5240                                 /* skip this chunk and continue processing */
5241                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5242                                 at += SCTP_SIZE32(plen);
5243                         }
5244                         break;
5245
5246                 }
5247                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5248         }
5249         return (op_err);
5250 invalid_size:
5251         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5252         *abort_processing = 1;
5253         if ((op_err == NULL) && phdr) {
5254                 int l_len;
5255
5256 #ifdef INET6
5257                 l_len = SCTP_MIN_OVERHEAD;
5258 #else
5259                 l_len = SCTP_MIN_V4_OVERHEAD;
5260 #endif
5261                 l_len += sizeof(struct sctp_chunkhdr);
5262                 l_len += (2 * sizeof(struct sctp_paramhdr));
5263                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5264                 if (op_err) {
5265                         SCTP_BUF_LEN(op_err) = 0;
5266 #ifdef INET6
5267                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5268 #else
5269                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5270 #endif
5271                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5272                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5273                 }
5274         }
5275         if ((op_err) && phdr) {
5276                 struct sctp_paramhdr s;
5277
5278                 if (err_at % 4) {
5279                         uint32_t cpthis = 0;
5280
5281                         pad_needed = 4 - (err_at % 4);
5282                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5283                         err_at += pad_needed;
5284                 }
5285                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5286                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5287                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5288                 err_at += sizeof(s);
5289                 /* Only copy back the p-hdr that caused the issue */
5290                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5291         }
5292         return (op_err);
5293 }
5294
5295 static int
5296 sctp_are_there_new_addresses(struct sctp_association *asoc,
5297     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5298 {
5299         /*
5300          * Given a INIT packet, look through the packet to verify that there
5301          * are NO new addresses. As we go through the parameters add reports
5302          * of any un-understood parameters that require an error.  Also we
5303          * must return (1) to drop the packet if we see a un-understood
5304          * parameter that tells us to drop the chunk.
5305          */
5306         struct sockaddr *sa_touse;
5307         struct sockaddr *sa;
5308         struct sctp_paramhdr *phdr, params;
5309         uint16_t ptype, plen;
5310         uint8_t fnd;
5311         struct sctp_nets *net;
5312         int check_src;
5313
5314 #ifdef INET
5315         struct sockaddr_in sin4, *sa4;
5316
5317 #endif
5318 #ifdef INET6
5319         struct sockaddr_in6 sin6, *sa6;
5320
5321 #endif
5322
5323 #ifdef INET
5324         memset(&sin4, 0, sizeof(sin4));
5325         sin4.sin_family = AF_INET;
5326         sin4.sin_len = sizeof(sin4);
5327 #endif
5328 #ifdef INET6
5329         memset(&sin6, 0, sizeof(sin6));
5330         sin6.sin6_family = AF_INET6;
5331         sin6.sin6_len = sizeof(sin6);
5332 #endif
5333         /* First what about the src address of the pkt ? */
5334         check_src = 0;
5335         switch (src->sa_family) {
5336 #ifdef INET
5337         case AF_INET:
5338                 if (asoc->scope.ipv4_addr_legal) {
5339                         check_src = 1;
5340                 }
5341                 break;
5342 #endif
5343 #ifdef INET6
5344         case AF_INET6:
5345                 if (asoc->scope.ipv6_addr_legal) {
5346                         check_src = 1;
5347                 }
5348                 break;
5349 #endif
5350         default:
5351                 /* TSNH */
5352                 break;
5353         }
5354         if (check_src) {
5355                 fnd = 0;
5356                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5357                         sa = (struct sockaddr *)&net->ro._l_addr;
5358                         if (sa->sa_family == src->sa_family) {
5359 #ifdef INET
5360                                 if (sa->sa_family == AF_INET) {
5361                                         struct sockaddr_in *src4;
5362
5363                                         sa4 = (struct sockaddr_in *)sa;
5364                                         src4 = (struct sockaddr_in *)src;
5365                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5366                                                 fnd = 1;
5367                                                 break;
5368                                         }
5369                                 }
5370 #endif
5371 #ifdef INET6
5372                                 if (sa->sa_family == AF_INET6) {
5373                                         struct sockaddr_in6 *src6;
5374
5375                                         sa6 = (struct sockaddr_in6 *)sa;
5376                                         src6 = (struct sockaddr_in6 *)src;
5377                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5378                                                 fnd = 1;
5379                                                 break;
5380                                         }
5381                                 }
5382 #endif
5383                         }
5384                 }
5385                 if (fnd == 0) {
5386                         /* New address added! no need to look futher. */
5387                         return (1);
5388                 }
5389         }
5390         /* Ok so far lets munge through the rest of the packet */
5391         offset += sizeof(struct sctp_init_chunk);
5392         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5393         while (phdr) {
5394                 sa_touse = NULL;
5395                 ptype = ntohs(phdr->param_type);
5396                 plen = ntohs(phdr->param_length);
5397                 switch (ptype) {
5398 #ifdef INET
5399                 case SCTP_IPV4_ADDRESS:
5400                         {
5401                                 struct sctp_ipv4addr_param *p4, p4_buf;
5402
5403                                 phdr = sctp_get_next_param(in_initpkt, offset,
5404                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5405                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5406                                     phdr == NULL) {
5407                                         return (1);
5408                                 }
5409                                 if (asoc->scope.ipv4_addr_legal) {
5410                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5411                                         sin4.sin_addr.s_addr = p4->addr;
5412                                         sa_touse = (struct sockaddr *)&sin4;
5413                                 }
5414                                 break;
5415                         }
5416 #endif
5417 #ifdef INET6
5418                 case SCTP_IPV6_ADDRESS:
5419                         {
5420                                 struct sctp_ipv6addr_param *p6, p6_buf;
5421
5422                                 phdr = sctp_get_next_param(in_initpkt, offset,
5423                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5424                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5425                                     phdr == NULL) {
5426                                         return (1);
5427                                 }
5428                                 if (asoc->scope.ipv6_addr_legal) {
5429                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5430                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5431                                             sizeof(p6->addr));
5432                                         sa_touse = (struct sockaddr *)&sin6;
5433                                 }
5434                                 break;
5435                         }
5436 #endif
5437                 default:
5438                         sa_touse = NULL;
5439                         break;
5440                 }
5441                 if (sa_touse) {
5442                         /* ok, sa_touse points to one to check */
5443                         fnd = 0;
5444                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5445                                 sa = (struct sockaddr *)&net->ro._l_addr;
5446                                 if (sa->sa_family != sa_touse->sa_family) {
5447                                         continue;
5448                                 }
5449 #ifdef INET
5450                                 if (sa->sa_family == AF_INET) {
5451                                         sa4 = (struct sockaddr_in *)sa;
5452                                         if (sa4->sin_addr.s_addr ==
5453                                             sin4.sin_addr.s_addr) {
5454                                                 fnd = 1;
5455                                                 break;
5456                                         }
5457                                 }
5458 #endif
5459 #ifdef INET6
5460                                 if (sa->sa_family == AF_INET6) {
5461                                         sa6 = (struct sockaddr_in6 *)sa;
5462                                         if (SCTP6_ARE_ADDR_EQUAL(
5463                                             sa6, &sin6)) {
5464                                                 fnd = 1;
5465                                                 break;
5466                                         }
5467                                 }
5468 #endif
5469                         }
5470                         if (!fnd) {
5471                                 /* New addr added! no need to look further */
5472                                 return (1);
5473                         }
5474                 }
5475                 offset += SCTP_SIZE32(plen);
5476                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5477         }
5478         return (0);
5479 }
5480
5481 /*
5482  * Given a MBUF chain that was sent into us containing an INIT. Build a
5483  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5484  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5485  * message (i.e. the struct sctp_init_msg).
5486  */
5487 void
5488 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5489     struct sctp_nets *src_net, struct mbuf *init_pkt,
5490     int iphlen, int offset,
5491     struct sockaddr *src, struct sockaddr *dst,
5492     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5493     uint8_t mflowtype, uint32_t mflowid,
5494     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5495 {
5496         struct sctp_association *asoc;
5497         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5498         struct sctp_init_ack_chunk *initack;
5499         struct sctp_adaptation_layer_indication *ali;
5500         struct sctp_supported_chunk_types_param *pr_supported;
5501         struct sctp_paramhdr *ph;
5502         union sctp_sockstore *over_addr;
5503         struct sctp_scoping scp;
5504
5505 #ifdef INET
5506         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5507         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5508         struct sockaddr_in *sin;
5509
5510 #endif
5511 #ifdef INET6
5512         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5513         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5514         struct sockaddr_in6 *sin6;
5515
5516 #endif
5517         struct sockaddr *to;
5518         struct sctp_state_cookie stc;
5519         struct sctp_nets *net = NULL;
5520         uint8_t *signature = NULL;
5521         int cnt_inits_to = 0;
5522         uint16_t his_limit, i_want;
5523         int abort_flag;
5524         int nat_friendly = 0;
5525         struct socket *so;
5526         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5527
5528         if (stcb) {
5529                 asoc = &stcb->asoc;
5530         } else {
5531                 asoc = NULL;
5532         }
5533         if ((asoc != NULL) &&
5534             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5535                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5536                         /*
5537                          * new addresses, out of here in non-cookie-wait
5538                          * states
5539                          *
5540                          * Send an ABORT, without the new address error cause.
5541                          * This looks no different than if no listener was
5542                          * present.
5543                          */
5544                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5545                             "Address added");
5546                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5547                             mflowtype, mflowid, inp->fibnum,
5548                             vrf_id, port);
5549                         return;
5550                 }
5551                 if (src_net != NULL && (src_net->port != port)) {
5552                         /*
5553                          * change of remote encapsulation port, out of here
5554                          * in non-cookie-wait states
5555                          *
5556                          * Send an ABORT, without an specific error cause. This
5557                          * looks no different than if no listener was
5558                          * present.
5559                          */
5560                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5561                             "Remote encapsulation port changed");
5562                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5563                             mflowtype, mflowid, inp->fibnum,
5564                             vrf_id, port);
5565                         return;
5566                 }
5567         }
5568         abort_flag = 0;
5569         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5570             (offset + sizeof(struct sctp_init_chunk)),
5571             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5572         if (abort_flag) {
5573 do_a_abort:
5574                 if (op_err == NULL) {
5575                         char msg[SCTP_DIAG_INFO_LEN];
5576
5577                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5578                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5579                             msg);
5580                 }
5581                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5582                     init_chk->init.initiate_tag, op_err,
5583                     mflowtype, mflowid, inp->fibnum,
5584                     vrf_id, port);
5585                 return;
5586         }
5587         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5588         if (m == NULL) {
5589                 /* No memory, INIT timer will re-attempt. */
5590                 if (op_err)
5591                         sctp_m_freem(op_err);
5592                 return;
5593         }
5594         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5595         padding_len = 0;
5596
5597         /*
5598          * We might not overwrite the identification[] completely and on
5599          * some platforms time_entered will contain some padding. Therefore
5600          * zero out the cookie to avoid putting uninitialized memory on the
5601          * wire.
5602          */
5603         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5604
5605         /* the time I built cookie */
5606         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5607
5608         /* populate any tie tags */
5609         if (asoc != NULL) {
5610                 /* unlock before tag selections */
5611                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5612                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5613                 stc.cookie_life = asoc->cookie_life;
5614                 net = asoc->primary_destination;
5615         } else {
5616                 stc.tie_tag_my_vtag = 0;
5617                 stc.tie_tag_peer_vtag = 0;
5618                 /* life I will award this cookie */
5619                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5620         }
5621
5622         /* copy in the ports for later check */
5623         stc.myport = sh->dest_port;
5624         stc.peerport = sh->src_port;
5625
5626         /*
5627          * If we wanted to honor cookie life extentions, we would add to
5628          * stc.cookie_life. For now we should NOT honor any extension
5629          */
5630         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5631         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5632                 stc.ipv6_addr_legal = 1;
5633                 if (SCTP_IPV6_V6ONLY(inp)) {
5634                         stc.ipv4_addr_legal = 0;
5635                 } else {
5636                         stc.ipv4_addr_legal = 1;
5637                 }
5638         } else {
5639                 stc.ipv6_addr_legal = 0;
5640                 stc.ipv4_addr_legal = 1;
5641         }
5642         stc.ipv4_scope = 0;
5643         if (net == NULL) {
5644                 to = src;
5645                 switch (dst->sa_family) {
5646 #ifdef INET
5647                 case AF_INET:
5648                         {
5649                                 /* lookup address */
5650                                 stc.address[0] = src4->sin_addr.s_addr;
5651                                 stc.address[1] = 0;
5652                                 stc.address[2] = 0;
5653                                 stc.address[3] = 0;
5654                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5655                                 /* local from address */
5656                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5657                                 stc.laddress[1] = 0;
5658                                 stc.laddress[2] = 0;
5659                                 stc.laddress[3] = 0;
5660                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5661                                 /* scope_id is only for v6 */
5662                                 stc.scope_id = 0;
5663                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5664                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5665                                         stc.ipv4_scope = 1;
5666                                 }
5667                                 /* Must use the address in this case */
5668                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5669                                         stc.loopback_scope = 1;
5670                                         stc.ipv4_scope = 1;
5671                                         stc.site_scope = 1;
5672                                         stc.local_scope = 0;
5673                                 }
5674                                 break;
5675                         }
5676 #endif
5677 #ifdef INET6
5678                 case AF_INET6:
5679                         {
5680                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5681                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5682                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5683                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5684                                         stc.loopback_scope = 1;
5685                                         stc.local_scope = 0;
5686                                         stc.site_scope = 1;
5687                                         stc.ipv4_scope = 1;
5688                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5689                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5690                                         /*
5691                                          * If the new destination or source
5692                                          * is a LINK_LOCAL we must have
5693                                          * common both site and local scope.
5694                                          * Don't set local scope though
5695                                          * since we must depend on the
5696                                          * source to be added implicitly. We
5697                                          * cannot assure just because we
5698                                          * share one link that all links are
5699                                          * common.
5700                                          */
5701                                         stc.local_scope = 0;
5702                                         stc.site_scope = 1;
5703                                         stc.ipv4_scope = 1;
5704                                         /*
5705                                          * we start counting for the private
5706                                          * address stuff at 1. since the
5707                                          * link local we source from won't
5708                                          * show up in our scoped count.
5709                                          */
5710                                         cnt_inits_to = 1;
5711                                         /*
5712                                          * pull out the scope_id from
5713                                          * incoming pkt
5714                                          */
5715                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5716                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5717                                         /*
5718                                          * If the new destination or source
5719                                          * is SITE_LOCAL then we must have
5720                                          * site scope in common.
5721                                          */
5722                                         stc.site_scope = 1;
5723                                 }
5724                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5725                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5726                                 break;
5727                         }
5728 #endif
5729                 default:
5730                         /* TSNH */
5731                         goto do_a_abort;
5732                         break;
5733                 }
5734         } else {
5735                 /* set the scope per the existing tcb */
5736
5737 #ifdef INET6
5738                 struct sctp_nets *lnet;
5739
5740 #endif
5741
5742                 stc.loopback_scope = asoc->scope.loopback_scope;
5743                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5744                 stc.site_scope = asoc->scope.site_scope;
5745                 stc.local_scope = asoc->scope.local_scope;
5746 #ifdef INET6
5747                 /* Why do we not consider IPv4 LL addresses? */
5748                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5749                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5750                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5751                                         /*
5752                                          * if we have a LL address, start
5753                                          * counting at 1.
5754                                          */
5755                                         cnt_inits_to = 1;
5756                                 }
5757                         }
5758                 }
5759 #endif
5760                 /* use the net pointer */
5761                 to = (struct sockaddr *)&net->ro._l_addr;
5762                 switch (to->sa_family) {
5763 #ifdef INET
5764                 case AF_INET:
5765                         sin = (struct sockaddr_in *)to;
5766                         stc.address[0] = sin->sin_addr.s_addr;
5767                         stc.address[1] = 0;
5768                         stc.address[2] = 0;
5769                         stc.address[3] = 0;
5770                         stc.addr_type = SCTP_IPV4_ADDRESS;
5771                         if (net->src_addr_selected == 0) {
5772                                 /*
5773                                  * strange case here, the INIT should have
5774                                  * did the selection.
5775                                  */
5776                                 net->ro._s_addr = sctp_source_address_selection(inp,
5777                                     stcb, (sctp_route_t *) & net->ro,
5778                                     net, 0, vrf_id);
5779                                 if (net->ro._s_addr == NULL)
5780                                         return;
5781
5782                                 net->src_addr_selected = 1;
5783
5784                         }
5785                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5786                         stc.laddress[1] = 0;
5787                         stc.laddress[2] = 0;
5788                         stc.laddress[3] = 0;
5789                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5790                         /* scope_id is only for v6 */
5791                         stc.scope_id = 0;
5792                         break;
5793 #endif
5794 #ifdef INET6
5795                 case AF_INET6:
5796                         sin6 = (struct sockaddr_in6 *)to;
5797                         memcpy(&stc.address, &sin6->sin6_addr,
5798                             sizeof(struct in6_addr));
5799                         stc.addr_type = SCTP_IPV6_ADDRESS;
5800                         stc.scope_id = sin6->sin6_scope_id;
5801                         if (net->src_addr_selected == 0) {
5802                                 /*
5803                                  * strange case here, the INIT should have
5804                                  * done the selection.
5805                                  */
5806                                 net->ro._s_addr = sctp_source_address_selection(inp,
5807                                     stcb, (sctp_route_t *) & net->ro,
5808                                     net, 0, vrf_id);
5809                                 if (net->ro._s_addr == NULL)
5810                                         return;
5811
5812                                 net->src_addr_selected = 1;
5813                         }
5814                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5815                             sizeof(struct in6_addr));
5816                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5817                         break;
5818 #endif
5819                 }
5820         }
5821         /* Now lets put the SCTP header in place */
5822         initack = mtod(m, struct sctp_init_ack_chunk *);
5823         /* Save it off for quick ref */
5824         stc.peers_vtag = init_chk->init.initiate_tag;
5825         /* who are we */
5826         memcpy(stc.identification, SCTP_VERSION_STRING,
5827             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5828         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5829         /* now the chunk header */
5830         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5831         initack->ch.chunk_flags = 0;
5832         /* fill in later from mbuf we build */
5833         initack->ch.chunk_length = 0;
5834         /* place in my tag */
5835         if ((asoc != NULL) &&
5836             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5837             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5838             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5839                 /* re-use the v-tags and init-seq here */
5840                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5841                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5842         } else {
5843                 uint32_t vtag, itsn;
5844
5845                 if (hold_inp_lock) {
5846                         SCTP_INP_INCR_REF(inp);
5847                         SCTP_INP_RUNLOCK(inp);
5848                 }
5849                 if (asoc) {
5850                         atomic_add_int(&asoc->refcnt, 1);
5851                         SCTP_TCB_UNLOCK(stcb);
5852         new_tag:
5853                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5854                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5855                                 /*
5856                                  * Got a duplicate vtag on some guy behind a
5857                                  * nat make sure we don't use it.
5858                                  */
5859                                 goto new_tag;
5860                         }
5861                         initack->init.initiate_tag = htonl(vtag);
5862                         /* get a TSN to use too */
5863                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5864                         initack->init.initial_tsn = htonl(itsn);
5865                         SCTP_TCB_LOCK(stcb);
5866                         atomic_add_int(&asoc->refcnt, -1);
5867                 } else {
5868                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5869                         initack->init.initiate_tag = htonl(vtag);
5870                         /* get a TSN to use too */
5871                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5872                 }
5873                 if (hold_inp_lock) {
5874                         SCTP_INP_RLOCK(inp);
5875                         SCTP_INP_DECR_REF(inp);
5876                 }
5877         }
5878         /* save away my tag to */
5879         stc.my_vtag = initack->init.initiate_tag;
5880
5881         /* set up some of the credits. */
5882         so = inp->sctp_socket;
5883         if (so == NULL) {
5884                 /* memory problem */
5885                 sctp_m_freem(m);
5886                 return;
5887         } else {
5888                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5889         }
5890         /* set what I want */
5891         his_limit = ntohs(init_chk->init.num_inbound_streams);
5892         /* choose what I want */
5893         if (asoc != NULL) {
5894                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5895                         i_want = asoc->streamoutcnt;
5896                 } else {
5897                         i_want = asoc->pre_open_streams;
5898                 }
5899         } else {
5900                 i_want = inp->sctp_ep.pre_open_stream_count;
5901         }
5902         if (his_limit < i_want) {
5903                 /* I Want more :< */
5904                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5905         } else {
5906                 /* I can have what I want :> */
5907                 initack->init.num_outbound_streams = htons(i_want);
5908         }
5909         /* tell him his limit. */
5910         initack->init.num_inbound_streams =
5911             htons(inp->sctp_ep.max_open_streams_intome);
5912
5913         /* adaptation layer indication parameter */
5914         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5915                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5916                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5917                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5918                 ali->ph.param_length = htons(parameter_len);
5919                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5920                 chunk_len += parameter_len;
5921         }
5922         /* ECN parameter */
5923         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5924             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5925                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5926                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5927                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5928                 ph->param_length = htons(parameter_len);
5929                 chunk_len += parameter_len;
5930         }
5931         /* PR-SCTP supported parameter */
5932         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5933             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5934                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5935                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5936                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5937                 ph->param_length = htons(parameter_len);
5938                 chunk_len += parameter_len;
5939         }
5940         /* Add NAT friendly parameter */
5941         if (nat_friendly) {
5942                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5943                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5944                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5945                 ph->param_length = htons(parameter_len);
5946                 chunk_len += parameter_len;
5947         }
5948         /* And now tell the peer which extensions we support */
5949         num_ext = 0;
5950         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5951         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5952             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5953                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5954         }
5955         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5956             ((asoc == NULL) && (inp->auth_supported == 1))) {
5957                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5958         }
5959         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5960             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5961                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5962                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5963         }
5964         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5965             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5966                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5967         }
5968         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5969             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5970                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5971         }
5972         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5973             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5974                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5975         }
5976         if (num_ext > 0) {
5977                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5978                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5979                 pr_supported->ph.param_length = htons(parameter_len);
5980                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5981                 chunk_len += parameter_len;
5982         }
5983         /* add authentication parameters */
5984         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5985             ((asoc == NULL) && (inp->auth_supported == 1))) {
5986                 struct sctp_auth_random *randp;
5987                 struct sctp_auth_hmac_algo *hmacs;
5988                 struct sctp_auth_chunk_list *chunks;
5989
5990                 if (padding_len > 0) {
5991                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5992                         chunk_len += padding_len;
5993                         padding_len = 0;
5994                 }
5995                 /* generate and add RANDOM parameter */
5996                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5997                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5998                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5999                 randp->ph.param_type = htons(SCTP_RANDOM);
6000                 randp->ph.param_length = htons(parameter_len);
6001                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6002                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6003                 chunk_len += parameter_len;
6004
6005                 if (padding_len > 0) {
6006                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6007                         chunk_len += padding_len;
6008                         padding_len = 0;
6009                 }
6010                 /* add HMAC_ALGO parameter */
6011                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6012                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
6013                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6014                     (uint8_t *) hmacs->hmac_ids);
6015                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6016                 hmacs->ph.param_length = htons(parameter_len);
6017                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6018                 chunk_len += parameter_len;
6019
6020                 if (padding_len > 0) {
6021                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6022                         chunk_len += padding_len;
6023                         padding_len = 0;
6024                 }
6025                 /* add CHUNKS parameter */
6026                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6027                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
6028                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6029                     chunks->chunk_types);
6030                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6031                 chunks->ph.param_length = htons(parameter_len);
6032                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6033                 chunk_len += parameter_len;
6034         }
6035         SCTP_BUF_LEN(m) = chunk_len;
6036         m_last = m;
6037         /* now the addresses */
6038         /*
6039          * To optimize this we could put the scoping stuff into a structure
6040          * and remove the individual uint8's from the stc structure. Then we
6041          * could just sifa in the address within the stc.. but for now this
6042          * is a quick hack to get the address stuff teased apart.
6043          */
6044         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6045         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6046         scp.loopback_scope = stc.loopback_scope;
6047         scp.ipv4_local_scope = stc.ipv4_scope;
6048         scp.local_scope = stc.local_scope;
6049         scp.site_scope = stc.site_scope;
6050         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6051             cnt_inits_to,
6052             &padding_len, &chunk_len);
6053         /* padding_len can only be positive, if no addresses have been added */
6054         if (padding_len > 0) {
6055                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6056                 chunk_len += padding_len;
6057                 SCTP_BUF_LEN(m) += padding_len;
6058                 padding_len = 0;
6059         }
6060         /* tack on the operational error if present */
6061         if (op_err) {
6062                 parameter_len = 0;
6063                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6064                         parameter_len += SCTP_BUF_LEN(m_tmp);
6065                 }
6066                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6067                 SCTP_BUF_NEXT(m_last) = op_err;
6068                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6069                         m_last = SCTP_BUF_NEXT(m_last);
6070                 }
6071                 chunk_len += parameter_len;
6072         }
6073         if (padding_len > 0) {
6074                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6075                 if (m_last == NULL) {
6076                         /* Houston we have a problem, no space */
6077                         sctp_m_freem(m);
6078                         return;
6079                 }
6080                 chunk_len += padding_len;
6081                 padding_len = 0;
6082         }
6083         /* Now we must build a cookie */
6084         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6085         if (m_cookie == NULL) {
6086                 /* memory problem */
6087                 sctp_m_freem(m);
6088                 return;
6089         }
6090         /* Now append the cookie to the end and update the space/size */
6091         SCTP_BUF_NEXT(m_last) = m_cookie;
6092         parameter_len = 0;
6093         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6094                 parameter_len += SCTP_BUF_LEN(m_tmp);
6095                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6096                         m_last = m_tmp;
6097                 }
6098         }
6099         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6100         chunk_len += parameter_len;
6101
6102         /*
6103          * Place in the size, but we don't include the last pad (if any) in
6104          * the INIT-ACK.
6105          */
6106         initack->ch.chunk_length = htons(chunk_len);
6107
6108         /*
6109          * Time to sign the cookie, we don't sign over the cookie signature
6110          * though thus we set trailer.
6111          */
6112         (void)sctp_hmac_m(SCTP_HMAC,
6113             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6114             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6115             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6116         /*
6117          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6118          * here since the timer will drive a retranmission.
6119          */
6120         if (padding_len > 0) {
6121                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6122                         sctp_m_freem(m);
6123                         return;
6124                 }
6125         }
6126         if (stc.loopback_scope) {
6127                 over_addr = (union sctp_sockstore *)dst;
6128         } else {
6129                 over_addr = NULL;
6130         }
6131
6132         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6133             0, 0,
6134             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6135             port, over_addr,
6136             mflowtype, mflowid,
6137             SCTP_SO_NOT_LOCKED);
6138         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6139 }
6140
6141
6142 static void
6143 sctp_prune_prsctp(struct sctp_tcb *stcb,
6144     struct sctp_association *asoc,
6145     struct sctp_sndrcvinfo *srcv,
6146     int dataout)
6147 {
6148         int freed_spc = 0;
6149         struct sctp_tmit_chunk *chk, *nchk;
6150
6151         SCTP_TCB_LOCK_ASSERT(stcb);
6152         if ((asoc->prsctp_supported) &&
6153             (asoc->sent_queue_cnt_removeable > 0)) {
6154                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6155                         /*
6156                          * Look for chunks marked with the PR_SCTP flag AND
6157                          * the buffer space flag. If the one being sent is
6158                          * equal or greater priority then purge the old one
6159                          * and free some space.
6160                          */
6161                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6162                                 /*
6163                                  * This one is PR-SCTP AND buffer space
6164                                  * limited type
6165                                  */
6166                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6167                                         /*
6168                                          * Lower numbers equates to higher
6169                                          * priority so if the one we are
6170                                          * looking at has a larger or equal
6171                                          * priority we want to drop the data
6172                                          * and NOT retransmit it.
6173                                          */
6174                                         if (chk->data) {
6175                                                 /*
6176                                                  * We release the book_size
6177                                                  * if the mbuf is here
6178                                                  */
6179                                                 int ret_spc;
6180                                                 uint8_t sent;
6181
6182                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6183                                                         sent = 1;
6184                                                 else
6185                                                         sent = 0;
6186                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6187                                                     sent,
6188                                                     SCTP_SO_LOCKED);
6189                                                 freed_spc += ret_spc;
6190                                                 if (freed_spc >= dataout) {
6191                                                         return;
6192                                                 }
6193                                         }       /* if chunk was present */
6194                                 }       /* if of sufficent priority */
6195                         }       /* if chunk has enabled */
6196                 }               /* tailqforeach */
6197
6198                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6199                         /* Here we must move to the sent queue and mark */
6200                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6201                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6202                                         if (chk->data) {
6203                                                 /*
6204                                                  * We release the book_size
6205                                                  * if the mbuf is here
6206                                                  */
6207                                                 int ret_spc;
6208
6209                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6210                                                     0, SCTP_SO_LOCKED);
6211
6212                                                 freed_spc += ret_spc;
6213                                                 if (freed_spc >= dataout) {
6214                                                         return;
6215                                                 }
6216                                         }       /* end if chk->data */
6217                                 }       /* end if right class */
6218                         }       /* end if chk pr-sctp */
6219                 }               /* tailqforeachsafe (chk) */
6220         }                       /* if enabled in asoc */
6221 }
6222
6223 int
6224 sctp_get_frag_point(struct sctp_tcb *stcb,
6225     struct sctp_association *asoc)
6226 {
6227         int siz, ovh;
6228
6229         /*
6230          * For endpoints that have both v6 and v4 addresses we must reserve
6231          * room for the ipv6 header, for those that are only dealing with V4
6232          * we use a larger frag point.
6233          */
6234         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6235                 ovh = SCTP_MED_OVERHEAD;
6236         } else {
6237                 ovh = SCTP_MED_V4_OVERHEAD;
6238         }
6239
6240         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6241                 siz = asoc->smallest_mtu - ovh;
6242         else
6243                 siz = (stcb->asoc.sctp_frag_point - ovh);
6244         /*
6245          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6246          */
6247         /* A data chunk MUST fit in a cluster */
6248         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6249         /* } */
6250
6251         /* adjust for an AUTH chunk if DATA requires auth */
6252         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6253                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6254
6255         if (siz % 4) {
6256                 /* make it an even word boundary please */
6257                 siz -= (siz % 4);
6258         }
6259         return (siz);
6260 }
6261
6262 static void
6263 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6264 {
6265         /*
6266          * We assume that the user wants PR_SCTP_TTL if the user provides a
6267          * positive lifetime but does not specify any PR_SCTP policy.
6268          */
6269         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6270                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6271         } else if (sp->timetolive > 0) {
6272                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6273                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6274         } else {
6275                 return;
6276         }
6277         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6278         case CHUNK_FLAGS_PR_SCTP_BUF:
6279                 /*
6280                  * Time to live is a priority stored in tv_sec when doing
6281                  * the buffer drop thing.
6282                  */
6283                 sp->ts.tv_sec = sp->timetolive;
6284                 sp->ts.tv_usec = 0;
6285                 break;
6286         case CHUNK_FLAGS_PR_SCTP_TTL:
6287                 {
6288                         struct timeval tv;
6289
6290                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6291                         tv.tv_sec = sp->timetolive / 1000;
6292                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6293                         /*
6294                          * TODO sctp_constants.h needs alternative time
6295                          * macros when _KERNEL is undefined.
6296                          */
6297                         timevaladd(&sp->ts, &tv);
6298                 }
6299                 break;
6300         case CHUNK_FLAGS_PR_SCTP_RTX:
6301                 /*
6302                  * Time to live is a the number or retransmissions stored in
6303                  * tv_sec.
6304                  */
6305                 sp->ts.tv_sec = sp->timetolive;
6306                 sp->ts.tv_usec = 0;
6307                 break;
6308         default:
6309                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6310                     "Unknown PR_SCTP policy %u.\n",
6311                     PR_SCTP_POLICY(sp->sinfo_flags));
6312                 break;
6313         }
6314 }
6315
6316 static int
6317 sctp_msg_append(struct sctp_tcb *stcb,
6318     struct sctp_nets *net,
6319     struct mbuf *m,
6320     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6321 {
6322         int error = 0;
6323         struct mbuf *at;
6324         struct sctp_stream_queue_pending *sp = NULL;
6325         struct sctp_stream_out *strm;
6326
6327         /*
6328          * Given an mbuf chain, put it into the association send queue and
6329          * place it on the wheel
6330          */
6331         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6332                 /* Invalid stream number */
6333                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6334                 error = EINVAL;
6335                 goto out_now;
6336         }
6337         if ((stcb->asoc.stream_locked) &&
6338             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6339                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6340                 error = EINVAL;
6341                 goto out_now;
6342         }
6343         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6344         /* Now can we send this? */
6345         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6346             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6347             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6348             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6349                 /* got data while shutting down */
6350                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6351                 error = ECONNRESET;
6352                 goto out_now;
6353         }
6354         sctp_alloc_a_strmoq(stcb, sp);
6355         if (sp == NULL) {
6356                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6357                 error = ENOMEM;
6358                 goto out_now;
6359         }
6360         sp->sinfo_flags = srcv->sinfo_flags;
6361         sp->timetolive = srcv->sinfo_timetolive;
6362         sp->ppid = srcv->sinfo_ppid;
6363         sp->context = srcv->sinfo_context;
6364         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6365                 sp->net = net;
6366                 atomic_add_int(&sp->net->ref_count, 1);
6367         } else {
6368                 sp->net = NULL;
6369         }
6370         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6371         sp->stream = srcv->sinfo_stream;
6372         sp->msg_is_complete = 1;
6373         sp->sender_all_done = 1;
6374         sp->some_taken = 0;
6375         sp->data = m;
6376         sp->tail_mbuf = NULL;
6377         sctp_set_prsctp_policy(sp);
6378         /*
6379          * We could in theory (for sendall) sifa the length in, but we would
6380          * still have to hunt through the chain since we need to setup the
6381          * tail_mbuf
6382          */
6383         sp->length = 0;
6384         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6385                 if (SCTP_BUF_NEXT(at) == NULL)
6386                         sp->tail_mbuf = at;
6387                 sp->length += SCTP_BUF_LEN(at);
6388         }
6389         if (srcv->sinfo_keynumber_valid) {
6390                 sp->auth_keyid = srcv->sinfo_keynumber;
6391         } else {
6392                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6393         }
6394         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6395                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6396                 sp->holds_key_ref = 1;
6397         }
6398         if (hold_stcb_lock == 0) {
6399                 SCTP_TCB_SEND_LOCK(stcb);
6400         }
6401         sctp_snd_sb_alloc(stcb, sp->length);
6402         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6403         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6404         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6405         m = NULL;
6406         if (hold_stcb_lock == 0) {
6407                 SCTP_TCB_SEND_UNLOCK(stcb);
6408         }
6409 out_now:
6410         if (m) {
6411                 sctp_m_freem(m);
6412         }
6413         return (error);
6414 }
6415
6416
6417 static struct mbuf *
6418 sctp_copy_mbufchain(struct mbuf *clonechain,
6419     struct mbuf *outchain,
6420     struct mbuf **endofchain,
6421     int can_take_mbuf,
6422     int sizeofcpy,
6423     uint8_t copy_by_ref)
6424 {
6425         struct mbuf *m;
6426         struct mbuf *appendchain;
6427         caddr_t cp;
6428         int len;
6429
6430         if (endofchain == NULL) {
6431                 /* error */
6432 error_out:
6433                 if (outchain)
6434                         sctp_m_freem(outchain);
6435                 return (NULL);
6436         }
6437         if (can_take_mbuf) {
6438                 appendchain = clonechain;
6439         } else {
6440                 if (!copy_by_ref &&
6441                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6442                     ) {
6443                         /* Its not in a cluster */
6444                         if (*endofchain == NULL) {
6445                                 /* lets get a mbuf cluster */
6446                                 if (outchain == NULL) {
6447                                         /* This is the general case */
6448                         new_mbuf:
6449                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6450                                         if (outchain == NULL) {
6451                                                 goto error_out;
6452                                         }
6453                                         SCTP_BUF_LEN(outchain) = 0;
6454                                         *endofchain = outchain;
6455                                         /* get the prepend space */
6456                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6457                                 } else {
6458                                         /*
6459                                          * We really should not get a NULL
6460                                          * in endofchain
6461                                          */
6462                                         /* find end */
6463                                         m = outchain;
6464                                         while (m) {
6465                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6466                                                         *endofchain = m;
6467                                                         break;
6468                                                 }
6469                                                 m = SCTP_BUF_NEXT(m);
6470                                         }
6471                                         /* sanity */
6472                                         if (*endofchain == NULL) {
6473                                                 /*
6474                                                  * huh, TSNH XXX maybe we
6475                                                  * should panic
6476                                                  */
6477                                                 sctp_m_freem(outchain);
6478                                                 goto new_mbuf;
6479                                         }
6480                                 }
6481                                 /* get the new end of length */
6482                                 len = M_TRAILINGSPACE(*endofchain);
6483                         } else {
6484                                 /* how much is left at the end? */
6485                                 len = M_TRAILINGSPACE(*endofchain);
6486                         }
6487                         /* Find the end of the data, for appending */
6488                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6489
6490                         /* Now lets copy it out */
6491                         if (len >= sizeofcpy) {
6492                                 /* It all fits, copy it in */
6493                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6494                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6495                         } else {
6496                                 /* fill up the end of the chain */
6497                                 if (len > 0) {
6498                                         m_copydata(clonechain, 0, len, cp);
6499                                         SCTP_BUF_LEN((*endofchain)) += len;
6500                                         /* now we need another one */
6501                                         sizeofcpy -= len;
6502                                 }
6503                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6504                                 if (m == NULL) {
6505                                         /* We failed */
6506                                         goto error_out;
6507                                 }
6508                                 SCTP_BUF_NEXT((*endofchain)) = m;
6509                                 *endofchain = m;
6510                                 cp = mtod((*endofchain), caddr_t);
6511                                 m_copydata(clonechain, len, sizeofcpy, cp);
6512                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6513                         }
6514                         return (outchain);
6515                 } else {
6516                         /* copy the old fashion way */
6517                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6518 #ifdef SCTP_MBUF_LOGGING
6519                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6520                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6521                         }
6522 #endif
6523                 }
6524         }
6525         if (appendchain == NULL) {
6526                 /* error */
6527                 if (outchain)
6528                         sctp_m_freem(outchain);
6529                 return (NULL);
6530         }
6531         if (outchain) {
6532                 /* tack on to the end */
6533                 if (*endofchain != NULL) {
6534                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6535                 } else {
6536                         m = outchain;
6537                         while (m) {
6538                                 if (SCTP_BUF_NEXT(m) == NULL) {
6539                                         SCTP_BUF_NEXT(m) = appendchain;
6540                                         break;
6541                                 }
6542                                 m = SCTP_BUF_NEXT(m);
6543                         }
6544                 }
6545                 /*
6546                  * save off the end and update the end-chain postion
6547                  */
6548                 m = appendchain;
6549                 while (m) {
6550                         if (SCTP_BUF_NEXT(m) == NULL) {
6551                                 *endofchain = m;
6552                                 break;
6553                         }
6554                         m = SCTP_BUF_NEXT(m);
6555                 }
6556                 return (outchain);
6557         } else {
6558                 /* save off the end and update the end-chain postion */
6559                 m = appendchain;
6560                 while (m) {
6561                         if (SCTP_BUF_NEXT(m) == NULL) {
6562                                 *endofchain = m;
6563                                 break;
6564                         }
6565                         m = SCTP_BUF_NEXT(m);
6566                 }
6567                 return (appendchain);
6568         }
6569 }
6570
6571 static int
6572 sctp_med_chunk_output(struct sctp_inpcb *inp,
6573     struct sctp_tcb *stcb,
6574     struct sctp_association *asoc,
6575     int *num_out,
6576     int *reason_code,
6577     int control_only, int from_where,
6578     struct timeval *now, int *now_filled, int frag_point, int so_locked
6579 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6580     SCTP_UNUSED
6581 #endif
6582 );
6583
6584 static void
6585 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6586     uint32_t val SCTP_UNUSED)
6587 {
6588         struct sctp_copy_all *ca;
6589         struct mbuf *m;
6590         int ret = 0;
6591         int added_control = 0;
6592         int un_sent, do_chunk_output = 1;
6593         struct sctp_association *asoc;
6594         struct sctp_nets *net;
6595
6596         ca = (struct sctp_copy_all *)ptr;
6597         if (ca->m == NULL) {
6598                 return;
6599         }
6600         if (ca->inp != inp) {
6601                 /* TSNH */
6602                 return;
6603         }
6604         if (ca->sndlen > 0) {
6605                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6606                 if (m == NULL) {
6607                         /* can't copy so we are done */
6608                         ca->cnt_failed++;
6609                         return;
6610                 }
6611 #ifdef SCTP_MBUF_LOGGING
6612                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6613                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6614                 }
6615 #endif
6616         } else {
6617                 m = NULL;
6618         }
6619         SCTP_TCB_LOCK_ASSERT(stcb);
6620         if (stcb->asoc.alternate) {
6621                 net = stcb->asoc.alternate;
6622         } else {
6623                 net = stcb->asoc.primary_destination;
6624         }
6625         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6626                 /* Abort this assoc with m as the user defined reason */
6627                 if (m != NULL) {
6628                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6629                 } else {
6630                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6631                             0, M_NOWAIT, 1, MT_DATA);
6632                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6633                 }
6634                 if (m != NULL) {
6635                         struct sctp_paramhdr *ph;
6636
6637                         ph = mtod(m, struct sctp_paramhdr *);
6638                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6639                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6640                 }
6641                 /*
6642                  * We add one here to keep the assoc from dis-appearing on
6643                  * us.
6644                  */
6645                 atomic_add_int(&stcb->asoc.refcnt, 1);
6646                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6647                 /*
6648                  * sctp_abort_an_association calls sctp_free_asoc() free
6649                  * association will NOT free it since we incremented the
6650                  * refcnt .. we do this to prevent it being freed and things
6651                  * getting tricky since we could end up (from free_asoc)
6652                  * calling inpcb_free which would get a recursive lock call
6653                  * to the iterator lock.. But as a consequence of that the
6654                  * stcb will return to us un-locked.. since free_asoc
6655                  * returns with either no TCB or the TCB unlocked, we must
6656                  * relock.. to unlock in the iterator timer :-0
6657                  */
6658                 SCTP_TCB_LOCK(stcb);
6659                 atomic_add_int(&stcb->asoc.refcnt, -1);
6660                 goto no_chunk_output;
6661         } else {
6662                 if (m) {
6663                         ret = sctp_msg_append(stcb, net, m,
6664                             &ca->sndrcv, 1);
6665                 }
6666                 asoc = &stcb->asoc;
6667                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6668                         /* shutdown this assoc */
6669                         int cnt;
6670
6671                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6672
6673                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6674                             TAILQ_EMPTY(&asoc->sent_queue) &&
6675                             (cnt == 0)) {
6676                                 if (asoc->locked_on_sending) {
6677                                         goto abort_anyway;
6678                                 }
6679                                 /*
6680                                  * there is nothing queued to send, so I'm
6681                                  * done...
6682                                  */
6683                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6684                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6685                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6686                                         /*
6687                                          * only send SHUTDOWN the first time
6688                                          * through
6689                                          */
6690                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6691                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6692                                         }
6693                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6694                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6695                                         sctp_stop_timers_for_shutdown(stcb);
6696                                         sctp_send_shutdown(stcb, net);
6697                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6698                                             net);
6699                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6700                                             asoc->primary_destination);
6701                                         added_control = 1;
6702                                         do_chunk_output = 0;
6703                                 }
6704                         } else {
6705                                 /*
6706                                  * we still got (or just got) data to send,
6707                                  * so set SHUTDOWN_PENDING
6708                                  */
6709                                 /*
6710                                  * XXX sockets draft says that SCTP_EOF
6711                                  * should be sent with no data.  currently,
6712                                  * we will allow user data to be sent first
6713                                  * and move to SHUTDOWN-PENDING
6714                                  */
6715                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6716                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6717                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6718                                         if (asoc->locked_on_sending) {
6719                                                 /*
6720                                                  * Locked to send out the
6721                                                  * data
6722                                                  */
6723                                                 struct sctp_stream_queue_pending *sp;
6724
6725                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6726                                                 if (sp) {
6727                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6728                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6729                                                 }
6730                                         }
6731                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6732                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6733                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6734                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6735                                                 struct mbuf *op_err;
6736                                                 char msg[SCTP_DIAG_INFO_LEN];
6737
6738                                 abort_anyway:
6739                                                 snprintf(msg, sizeof(msg),
6740                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6741                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6742                                                     msg);
6743                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6744                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6745                                                     op_err, SCTP_SO_NOT_LOCKED);
6746                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6747                                                 goto no_chunk_output;
6748                                         }
6749                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6750                                             asoc->primary_destination);
6751                                 }
6752                         }
6753
6754                 }
6755         }
6756         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6757             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6758
6759         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6760             (stcb->asoc.total_flight > 0) &&
6761             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6762                 do_chunk_output = 0;
6763         }
6764         if (do_chunk_output)
6765                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6766         else if (added_control) {
6767                 int num_out, reason, now_filled = 0;
6768                 struct timeval now;
6769                 int frag_point;
6770
6771                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6772                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6773                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6774         }
6775 no_chunk_output:
6776         if (ret) {
6777                 ca->cnt_failed++;
6778         } else {
6779                 ca->cnt_sent++;
6780         }
6781 }
6782
6783 static void
6784 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6785 {
6786         struct sctp_copy_all *ca;
6787
6788         ca = (struct sctp_copy_all *)ptr;
6789         /*
6790          * Do a notify here? Kacheong suggests that the notify be done at
6791          * the send time.. so you would push up a notification if any send
6792          * failed. Don't know if this is feasable since the only failures we
6793          * have is "memory" related and if you cannot get an mbuf to send
6794          * the data you surely can't get an mbuf to send up to notify the
6795          * user you can't send the data :->
6796          */
6797
6798         /* now free everything */
6799         sctp_m_freem(ca->m);
6800         SCTP_FREE(ca, SCTP_M_COPYAL);
6801 }
6802
6803 static struct mbuf *
6804 sctp_copy_out_all(struct uio *uio, int len)
6805 {
6806         struct mbuf *ret, *at;
6807         int left, willcpy, cancpy, error;
6808
6809         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6810         if (ret == NULL) {
6811                 /* TSNH */
6812                 return (NULL);
6813         }
6814         left = len;
6815         SCTP_BUF_LEN(ret) = 0;
6816         /* save space for the data chunk header */
6817         cancpy = M_TRAILINGSPACE(ret);
6818         willcpy = min(cancpy, left);
6819         at = ret;
6820         while (left > 0) {
6821                 /* Align data to the end */
6822                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6823                 if (error) {
6824         err_out_now:
6825                         sctp_m_freem(at);
6826                         return (NULL);
6827                 }
6828                 SCTP_BUF_LEN(at) = willcpy;
6829                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6830                 left -= willcpy;
6831                 if (left > 0) {
6832                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6833                         if (SCTP_BUF_NEXT(at) == NULL) {
6834                                 goto err_out_now;
6835                         }
6836                         at = SCTP_BUF_NEXT(at);
6837                         SCTP_BUF_LEN(at) = 0;
6838                         cancpy = M_TRAILINGSPACE(at);
6839                         willcpy = min(cancpy, left);
6840                 }
6841         }
6842         return (ret);
6843 }
6844
6845 static int
6846 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6847     struct sctp_sndrcvinfo *srcv)
6848 {
6849         int ret;
6850         struct sctp_copy_all *ca;
6851
6852         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6853             SCTP_M_COPYAL);
6854         if (ca == NULL) {
6855                 sctp_m_freem(m);
6856                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6857                 return (ENOMEM);
6858         }
6859         memset(ca, 0, sizeof(struct sctp_copy_all));
6860
6861         ca->inp = inp;
6862         if (srcv) {
6863                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6864         }
6865         /*
6866          * take off the sendall flag, it would be bad if we failed to do
6867          * this :-0
6868          */
6869         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6870         /* get length and mbuf chain */
6871         if (uio) {
6872                 ca->sndlen = uio->uio_resid;
6873                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6874                 if (ca->m == NULL) {
6875                         SCTP_FREE(ca, SCTP_M_COPYAL);
6876                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6877                         return (ENOMEM);
6878                 }
6879         } else {
6880                 /* Gather the length of the send */
6881                 struct mbuf *mat;
6882
6883                 ca->sndlen = 0;
6884                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6885                         ca->sndlen += SCTP_BUF_LEN(mat);
6886                 }
6887         }
6888         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6889             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6890             SCTP_ASOC_ANY_STATE,
6891             (void *)ca, 0,
6892             sctp_sendall_completes, inp, 1);
6893         if (ret) {
6894                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6895                 SCTP_FREE(ca, SCTP_M_COPYAL);
6896                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6897                 return (EFAULT);
6898         }
6899         return (0);
6900 }
6901
6902
6903 void
6904 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6905 {
6906         struct sctp_tmit_chunk *chk, *nchk;
6907
6908         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6909                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6910                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6911                         if (chk->data) {
6912                                 sctp_m_freem(chk->data);
6913                                 chk->data = NULL;
6914                         }
6915                         asoc->ctrl_queue_cnt--;
6916                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6917                 }
6918         }
6919 }
6920
6921 void
6922 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6923 {
6924         struct sctp_association *asoc;
6925         struct sctp_tmit_chunk *chk, *nchk;
6926         struct sctp_asconf_chunk *acp;
6927
6928         asoc = &stcb->asoc;
6929         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6930                 /* find SCTP_ASCONF chunk in queue */
6931                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6932                         if (chk->data) {
6933                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6934                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6935                                         /* Not Acked yet */
6936                                         break;
6937                                 }
6938                         }
6939                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6940                         if (chk->data) {
6941                                 sctp_m_freem(chk->data);
6942                                 chk->data = NULL;
6943                         }
6944                         asoc->ctrl_queue_cnt--;
6945                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6946                 }
6947         }
6948 }
6949
6950
6951 static void
6952 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6953     struct sctp_association *asoc,
6954     struct sctp_tmit_chunk **data_list,
6955     int bundle_at,
6956     struct sctp_nets *net)
6957 {
6958         int i;
6959         struct sctp_tmit_chunk *tp1;
6960
6961         for (i = 0; i < bundle_at; i++) {
6962                 /* off of the send queue */
6963                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6964                 asoc->send_queue_cnt--;
6965                 if (i > 0) {
6966                         /*
6967                          * Any chunk NOT 0 you zap the time chunk 0 gets
6968                          * zapped or set based on if a RTO measurment is
6969                          * needed.
6970                          */
6971                         data_list[i]->do_rtt = 0;
6972                 }
6973                 /* record time */
6974                 data_list[i]->sent_rcv_time = net->last_sent_time;
6975                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6976                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6977                 if (data_list[i]->whoTo == NULL) {
6978                         data_list[i]->whoTo = net;
6979                         atomic_add_int(&net->ref_count, 1);
6980                 }
6981                 /* on to the sent queue */
6982                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6983                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6984                         struct sctp_tmit_chunk *tpp;
6985
6986                         /* need to move back */
6987         back_up_more:
6988                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6989                         if (tpp == NULL) {
6990                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6991                                 goto all_done;
6992                         }
6993                         tp1 = tpp;
6994                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6995                                 goto back_up_more;
6996                         }
6997                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6998                 } else {
6999                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7000                             data_list[i],
7001                             sctp_next);
7002                 }
7003 all_done:
7004                 /* This does not lower until the cum-ack passes it */
7005                 asoc->sent_queue_cnt++;
7006                 if ((asoc->peers_rwnd <= 0) &&
7007                     (asoc->total_flight == 0) &&
7008                     (bundle_at == 1)) {
7009                         /* Mark the chunk as being a window probe */
7010                         SCTP_STAT_INCR(sctps_windowprobed);
7011                 }
7012 #ifdef SCTP_AUDITING_ENABLED
7013                 sctp_audit_log(0xC2, 3);
7014 #endif
7015                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7016                 data_list[i]->snd_count = 1;
7017                 data_list[i]->rec.data.chunk_was_revoked = 0;
7018                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7019                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7020                             data_list[i]->whoTo->flight_size,
7021                             data_list[i]->book_size,
7022                             (uintptr_t) data_list[i]->whoTo,
7023                             data_list[i]->rec.data.TSN_seq);
7024                 }
7025                 sctp_flight_size_increase(data_list[i]);
7026                 sctp_total_flight_increase(stcb, data_list[i]);
7027                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7028                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7029                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7030                 }
7031                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7032                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7033                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7034                         /* SWS sender side engages */
7035                         asoc->peers_rwnd = 0;
7036                 }
7037         }
7038         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7039                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7040         }
7041 }
7042
7043 static void
7044 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7045 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7046     SCTP_UNUSED
7047 #endif
7048 )
7049 {
7050         struct sctp_tmit_chunk *chk, *nchk;
7051
7052         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7053                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7054                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7055                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7056                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7057                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7058                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7059                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7060                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7061                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7062                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7063                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7064                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7065                         /* Stray chunks must be cleaned up */
7066         clean_up_anyway:
7067                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7068                         if (chk->data) {
7069                                 sctp_m_freem(chk->data);
7070                                 chk->data = NULL;
7071                         }
7072                         asoc->ctrl_queue_cnt--;
7073                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7074                                 asoc->fwd_tsn_cnt--;
7075                         sctp_free_a_chunk(stcb, chk, so_locked);
7076                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7077                         /* special handling, we must look into the param */
7078                         if (chk != asoc->str_reset) {
7079                                 goto clean_up_anyway;
7080                         }
7081                 }
7082         }
7083 }
7084
7085
7086 static int
7087 sctp_can_we_split_this(struct sctp_tcb *stcb,
7088     uint32_t length,
7089     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7090 {
7091         /*
7092          * Make a decision on if I should split a msg into multiple parts.
7093          * This is only asked of incomplete messages.
7094          */
7095         if (eeor_on) {
7096                 /*
7097                  * If we are doing EEOR we need to always send it if its the
7098                  * entire thing, since it might be all the guy is putting in
7099                  * the hopper.
7100                  */
7101                 if (goal_mtu >= length) {
7102                         /*-
7103                          * If we have data outstanding,
7104                          * we get another chance when the sack
7105                          * arrives to transmit - wait for more data
7106                          */
7107                         if (stcb->asoc.total_flight == 0) {
7108                                 /*
7109                                  * If nothing is in flight, we zero the
7110                                  * packet counter.
7111                                  */
7112                                 return (length);
7113                         }
7114                         return (0);
7115
7116                 } else {
7117                         /* You can fill the rest */
7118                         return (goal_mtu);
7119                 }
7120         }
7121         /*-
7122          * For those strange folk that make the send buffer
7123          * smaller than our fragmentation point, we can't
7124          * get a full msg in so we have to allow splitting.
7125          */
7126         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7127                 return (length);
7128         }
7129         if ((length <= goal_mtu) ||
7130             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7131                 /* Sub-optimial residual don't split in non-eeor mode. */
7132                 return (0);
7133         }
7134         /*
7135          * If we reach here length is larger than the goal_mtu. Do we wish
7136          * to split it for the sake of packet putting together?
7137          */
7138         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7139                 /* Its ok to split it */
7140                 return (min(goal_mtu, frag_point));
7141         }
7142         /* Nope, can't split */
7143         return (0);
7144
7145 }
7146
7147 static uint32_t
7148 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7149     struct sctp_stream_out *strq,
7150     uint32_t goal_mtu,
7151     uint32_t frag_point,
7152     int *locked,
7153     int *giveup,
7154     int eeor_mode,
7155     int *bail,
7156     int so_locked
7157 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7158     SCTP_UNUSED
7159 #endif
7160 )
7161 {
7162         /* Move from the stream to the send_queue keeping track of the total */
7163         struct sctp_association *asoc;
7164         struct sctp_stream_queue_pending *sp;
7165         struct sctp_tmit_chunk *chk;
7166         struct sctp_data_chunk *dchkh;
7167         uint32_t to_move, length;
7168         uint8_t rcv_flags = 0;
7169         uint8_t some_taken;
7170         uint8_t send_lock_up = 0;
7171
7172         SCTP_TCB_LOCK_ASSERT(stcb);
7173         asoc = &stcb->asoc;
7174 one_more_time:
7175         /* sa_ignore FREED_MEMORY */
7176         sp = TAILQ_FIRST(&strq->outqueue);
7177         if (sp == NULL) {
7178                 *locked = 0;
7179                 if (send_lock_up == 0) {
7180                         SCTP_TCB_SEND_LOCK(stcb);
7181                         send_lock_up = 1;
7182                 }
7183                 sp = TAILQ_FIRST(&strq->outqueue);
7184                 if (sp) {
7185                         goto one_more_time;
7186                 }
7187                 if (strq->last_msg_incomplete) {
7188                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7189                             strq->stream_no,
7190                             strq->last_msg_incomplete);
7191                         strq->last_msg_incomplete = 0;
7192                 }
7193                 to_move = 0;
7194                 if (send_lock_up) {
7195                         SCTP_TCB_SEND_UNLOCK(stcb);
7196                         send_lock_up = 0;
7197                 }
7198                 goto out_of;
7199         }
7200         if ((sp->msg_is_complete) && (sp->length == 0)) {
7201                 if (sp->sender_all_done) {
7202                         /*
7203                          * We are doing differed cleanup. Last time through
7204                          * when we took all the data the sender_all_done was
7205                          * not set.
7206                          */
7207                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7208                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7209                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7210                                     sp->sender_all_done,
7211                                     sp->length,
7212                                     sp->msg_is_complete,
7213                                     sp->put_last_out,
7214                                     send_lock_up);
7215                         }
7216                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7217                                 SCTP_TCB_SEND_LOCK(stcb);
7218                                 send_lock_up = 1;
7219                         }
7220                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7221                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7222                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7223                             (strq->chunks_on_queues == 0) &&
7224                             TAILQ_EMPTY(&strq->outqueue)) {
7225                                 stcb->asoc.trigger_reset = 1;
7226                         }
7227                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7228                         if (sp->net) {
7229                                 sctp_free_remote_addr(sp->net);
7230                                 sp->net = NULL;
7231                         }
7232                         if (sp->data) {
7233                                 sctp_m_freem(sp->data);
7234                                 sp->data = NULL;
7235                         }
7236                         sctp_free_a_strmoq(stcb, sp, so_locked);
7237                         /* we can't be locked to it */
7238                         *locked = 0;
7239                         stcb->asoc.locked_on_sending = NULL;
7240                         if (send_lock_up) {
7241                                 SCTP_TCB_SEND_UNLOCK(stcb);
7242                                 send_lock_up = 0;
7243                         }
7244                         /* back to get the next msg */
7245                         goto one_more_time;
7246                 } else {
7247                         /*
7248                          * sender just finished this but still holds a
7249                          * reference
7250                          */
7251                         *locked = 1;
7252                         *giveup = 1;
7253                         to_move = 0;
7254                         goto out_of;
7255                 }
7256         } else {
7257                 /* is there some to get */
7258                 if (sp->length == 0) {
7259                         /* no */
7260                         *locked = 1;
7261                         *giveup = 1;
7262                         to_move = 0;
7263                         goto out_of;
7264                 } else if (sp->discard_rest) {
7265                         if (send_lock_up == 0) {
7266                                 SCTP_TCB_SEND_LOCK(stcb);
7267                                 send_lock_up = 1;
7268                         }
7269                         /* Whack down the size */
7270                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7271                         if ((stcb->sctp_socket != NULL) &&
7272                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7273                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7274                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7275                         }
7276                         if (sp->data) {
7277                                 sctp_m_freem(sp->data);
7278                                 sp->data = NULL;
7279                                 sp->tail_mbuf = NULL;
7280                         }
7281                         sp->length = 0;
7282                         sp->some_taken = 1;
7283                         *locked = 1;
7284                         *giveup = 1;
7285                         to_move = 0;
7286                         goto out_of;
7287                 }
7288         }
7289         some_taken = sp->some_taken;
7290 re_look:
7291         length = sp->length;
7292         if (sp->msg_is_complete) {
7293                 /* The message is complete */
7294                 to_move = min(length, frag_point);
7295                 if (to_move == length) {
7296                         /* All of it fits in the MTU */
7297                         if (sp->some_taken) {
7298                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7299                                 sp->put_last_out = 1;
7300                         } else {
7301                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7302                                 sp->put_last_out = 1;
7303                         }
7304                 } else {
7305                         /* Not all of it fits, we fragment */
7306                         if (sp->some_taken == 0) {
7307                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7308                         }
7309                         sp->some_taken = 1;
7310                 }
7311         } else {
7312                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7313                 if (to_move) {
7314                         /*-
7315                          * We use a snapshot of length in case it
7316                          * is expanding during the compare.
7317                          */
7318                         uint32_t llen;
7319
7320                         llen = length;
7321                         if (to_move >= llen) {
7322                                 to_move = llen;
7323                                 if (send_lock_up == 0) {
7324                                         /*-
7325                                          * We are taking all of an incomplete msg
7326                                          * thus we need a send lock.
7327                                          */
7328                                         SCTP_TCB_SEND_LOCK(stcb);
7329                                         send_lock_up = 1;
7330                                         if (sp->msg_is_complete) {
7331                                                 /*
7332                                                  * the sender finished the
7333                                                  * msg
7334                                                  */
7335                                                 goto re_look;
7336                                         }
7337                                 }
7338                         }
7339                         if (sp->some_taken == 0) {
7340                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7341                                 sp->some_taken = 1;
7342                         }
7343                 } else {
7344                         /* Nothing to take. */
7345                         if (sp->some_taken) {
7346                                 *locked = 1;
7347                         }
7348                         *giveup = 1;
7349                         to_move = 0;
7350                         goto out_of;
7351                 }
7352         }
7353
7354         /* If we reach here, we can copy out a chunk */
7355         sctp_alloc_a_chunk(stcb, chk);
7356         if (chk == NULL) {
7357                 /* No chunk memory */
7358                 *giveup = 1;
7359                 to_move = 0;
7360                 goto out_of;
7361         }
7362         /*
7363          * Setup for unordered if needed by looking at the user sent info
7364          * flags.
7365          */
7366         if (sp->sinfo_flags & SCTP_UNORDERED) {
7367                 rcv_flags |= SCTP_DATA_UNORDERED;
7368         }
7369         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7370             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7371                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7372         }
7373         /* clear out the chunk before setting up */
7374         memset(chk, 0, sizeof(*chk));
7375         chk->rec.data.rcv_flags = rcv_flags;
7376
7377         if (to_move >= length) {
7378                 /* we think we can steal the whole thing */
7379                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7380                         SCTP_TCB_SEND_LOCK(stcb);
7381                         send_lock_up = 1;
7382                 }
7383                 if (to_move < sp->length) {
7384                         /* bail, it changed */
7385                         goto dont_do_it;
7386                 }
7387                 chk->data = sp->data;
7388                 chk->last_mbuf = sp->tail_mbuf;
7389                 /* register the stealing */
7390                 sp->data = sp->tail_mbuf = NULL;
7391         } else {
7392                 struct mbuf *m;
7393
7394 dont_do_it:
7395                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7396                 chk->last_mbuf = NULL;
7397                 if (chk->data == NULL) {
7398                         sp->some_taken = some_taken;
7399                         sctp_free_a_chunk(stcb, chk, so_locked);
7400                         *bail = 1;
7401                         to_move = 0;
7402                         goto out_of;
7403                 }
7404 #ifdef SCTP_MBUF_LOGGING
7405                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7406                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7407                 }
7408 #endif
7409                 /* Pull off the data */
7410                 m_adj(sp->data, to_move);
7411                 /* Now lets work our way down and compact it */
7412                 m = sp->data;
7413                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7414                         sp->data = SCTP_BUF_NEXT(m);
7415                         SCTP_BUF_NEXT(m) = NULL;
7416                         if (sp->tail_mbuf == m) {
7417                                 /*-
7418                                  * Freeing tail? TSNH since
7419                                  * we supposedly were taking less
7420                                  * than the sp->length.
7421                                  */
7422 #ifdef INVARIANTS
7423                                 panic("Huh, freing tail? - TSNH");
7424 #else
7425                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7426                                 sp->tail_mbuf = sp->data = NULL;
7427                                 sp->length = 0;
7428 #endif
7429
7430                         }
7431                         sctp_m_free(m);
7432                         m = sp->data;
7433                 }
7434         }
7435         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7436                 chk->copy_by_ref = 1;
7437         } else {
7438                 chk->copy_by_ref = 0;
7439         }
7440         /*
7441          * get last_mbuf and counts of mb useage This is ugly but hopefully
7442          * its only one mbuf.
7443          */
7444         if (chk->last_mbuf == NULL) {
7445                 chk->last_mbuf = chk->data;
7446                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7447                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7448                 }
7449         }
7450         if (to_move > length) {
7451                 /*- This should not happen either
7452                  * since we always lower to_move to the size
7453                  * of sp->length if its larger.
7454                  */
7455 #ifdef INVARIANTS
7456                 panic("Huh, how can to_move be larger?");
7457 #else
7458                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7459                 sp->length = 0;
7460 #endif
7461         } else {
7462                 atomic_subtract_int(&sp->length, to_move);
7463         }
7464         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7465                 /* Not enough room for a chunk header, get some */
7466                 struct mbuf *m;
7467
7468                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7469                 if (m == NULL) {
7470                         /*
7471                          * we're in trouble here. _PREPEND below will free
7472                          * all the data if there is no leading space, so we
7473                          * must put the data back and restore.
7474                          */
7475                         if (send_lock_up == 0) {
7476                                 SCTP_TCB_SEND_LOCK(stcb);
7477                                 send_lock_up = 1;
7478                         }
7479                         if (sp->data == NULL) {
7480                                 /* unsteal the data */
7481                                 sp->data = chk->data;
7482                                 sp->tail_mbuf = chk->last_mbuf;
7483                         } else {
7484                                 struct mbuf *m_tmp;
7485
7486                                 /* reassemble the data */
7487                                 m_tmp = sp->data;
7488                                 sp->data = chk->data;
7489                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7490                         }
7491                         sp->some_taken = some_taken;
7492                         atomic_add_int(&sp->length, to_move);
7493                         chk->data = NULL;
7494                         *bail = 1;
7495                         sctp_free_a_chunk(stcb, chk, so_locked);
7496                         to_move = 0;
7497                         goto out_of;
7498                 } else {
7499                         SCTP_BUF_LEN(m) = 0;
7500                         SCTP_BUF_NEXT(m) = chk->data;
7501                         chk->data = m;
7502                         M_ALIGN(chk->data, 4);
7503                 }
7504         }
7505         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7506         if (chk->data == NULL) {
7507                 /* HELP, TSNH since we assured it would not above? */
7508 #ifdef INVARIANTS
7509                 panic("prepend failes HELP?");
7510 #else
7511                 SCTP_PRINTF("prepend fails HELP?\n");
7512                 sctp_free_a_chunk(stcb, chk, so_locked);
7513 #endif
7514                 *bail = 1;
7515                 to_move = 0;
7516                 goto out_of;
7517         }
7518         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7519         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7520         chk->book_size_scale = 0;
7521         chk->sent = SCTP_DATAGRAM_UNSENT;
7522
7523         chk->flags = 0;
7524         chk->asoc = &stcb->asoc;
7525         chk->pad_inplace = 0;
7526         chk->no_fr_allowed = 0;
7527         chk->rec.data.stream_seq = strq->next_sequence_send;
7528         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7529             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7530                 strq->next_sequence_send++;
7531         }
7532         chk->rec.data.stream_number = sp->stream;
7533         chk->rec.data.payloadtype = sp->ppid;
7534         chk->rec.data.context = sp->context;
7535         chk->rec.data.doing_fast_retransmit = 0;
7536
7537         chk->rec.data.timetodrop = sp->ts;
7538         chk->flags = sp->act_flags;
7539
7540         if (sp->net) {
7541                 chk->whoTo = sp->net;
7542                 atomic_add_int(&chk->whoTo->ref_count, 1);
7543         } else
7544                 chk->whoTo = NULL;
7545
7546         if (sp->holds_key_ref) {
7547                 chk->auth_keyid = sp->auth_keyid;
7548                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7549                 chk->holds_key_ref = 1;
7550         }
7551         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7552         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7553                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7554                     (uintptr_t) stcb, sp->length,
7555                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7556                     chk->rec.data.TSN_seq);
7557         }
7558         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7559         /*
7560          * Put the rest of the things in place now. Size was done earlier in
7561          * previous loop prior to padding.
7562          */
7563
7564 #ifdef SCTP_ASOCLOG_OF_TSNS
7565         SCTP_TCB_LOCK_ASSERT(stcb);
7566         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7567                 asoc->tsn_out_at = 0;
7568                 asoc->tsn_out_wrapped = 1;
7569         }
7570         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7571         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7572         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7573         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7574         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7575         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7576         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7577         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7578         asoc->tsn_out_at++;
7579 #endif
7580
7581         dchkh->ch.chunk_type = SCTP_DATA;
7582         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7583         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7584         dchkh->dp.stream_id = htons(strq->stream_no);
7585         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7586         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7587         dchkh->ch.chunk_length = htons(chk->send_size);
7588         /* Now advance the chk->send_size by the actual pad needed. */
7589         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7590                 /* need a pad */
7591                 struct mbuf *lm;
7592                 int pads;
7593
7594                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7595                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7596                 if (lm != NULL) {
7597                         chk->last_mbuf = lm;
7598                         chk->pad_inplace = 1;
7599                 }
7600                 chk->send_size += pads;
7601         }
7602         if (PR_SCTP_ENABLED(chk->flags)) {
7603                 asoc->pr_sctp_cnt++;
7604         }
7605         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7606                 /* All done pull and kill the message */
7607                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7608                 if (sp->put_last_out == 0) {
7609                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7610                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7611                             sp->sender_all_done,
7612                             sp->length,
7613                             sp->msg_is_complete,
7614                             sp->put_last_out,
7615                             send_lock_up);
7616                 }
7617                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7618                         SCTP_TCB_SEND_LOCK(stcb);
7619                         send_lock_up = 1;
7620                 }
7621                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7622                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7623                     (strq->chunks_on_queues == 0) &&
7624                     TAILQ_EMPTY(&strq->outqueue)) {
7625                         stcb->asoc.trigger_reset = 1;
7626                 }
7627                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7628                 if (sp->net) {
7629                         sctp_free_remote_addr(sp->net);
7630                         sp->net = NULL;
7631                 }
7632                 if (sp->data) {
7633                         sctp_m_freem(sp->data);
7634                         sp->data = NULL;
7635                 }
7636                 sctp_free_a_strmoq(stcb, sp, so_locked);
7637
7638                 /* we can't be locked to it */
7639                 *locked = 0;
7640                 stcb->asoc.locked_on_sending = NULL;
7641         } else {
7642                 /* more to go, we are locked */
7643                 *locked = 1;
7644         }
7645         asoc->chunks_on_out_queue++;
7646         strq->chunks_on_queues++;
7647         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7648         asoc->send_queue_cnt++;
7649 out_of:
7650         if (send_lock_up) {
7651                 SCTP_TCB_SEND_UNLOCK(stcb);
7652         }
7653         return (to_move);
7654 }
7655
7656
7657 static void
7658 sctp_fill_outqueue(struct sctp_tcb *stcb,
7659     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7660 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7661     SCTP_UNUSED
7662 #endif
7663 )
7664 {
7665         struct sctp_association *asoc;
7666         struct sctp_stream_out *strq;
7667         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7668         int locked, giveup;
7669
7670         SCTP_TCB_LOCK_ASSERT(stcb);
7671         asoc = &stcb->asoc;
7672         switch (net->ro._l_addr.sa.sa_family) {
7673 #ifdef INET
7674         case AF_INET:
7675                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7676                 break;
7677 #endif
7678 #ifdef INET6
7679         case AF_INET6:
7680                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7681                 break;
7682 #endif
7683         default:
7684                 /* TSNH */
7685                 goal_mtu = net->mtu;
7686                 break;
7687         }
7688         /* Need an allowance for the data chunk header too */
7689         goal_mtu -= sizeof(struct sctp_data_chunk);
7690
7691         /* must make even word boundary */
7692         goal_mtu &= 0xfffffffc;
7693         if (asoc->locked_on_sending) {
7694                 /* We are stuck on one stream until the message completes. */
7695                 strq = asoc->locked_on_sending;
7696                 locked = 1;
7697         } else {
7698                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7699                 locked = 0;
7700         }
7701         while ((goal_mtu > 0) && strq) {
7702                 giveup = 0;
7703                 bail = 0;
7704                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7705                     &giveup, eeor_mode, &bail, so_locked);
7706                 if (moved_how_much)
7707                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7708
7709                 if (locked) {
7710                         asoc->locked_on_sending = strq;
7711                         if ((moved_how_much == 0) || (giveup) || bail)
7712                                 /* no more to move for now */
7713                                 break;
7714                 } else {
7715                         asoc->locked_on_sending = NULL;
7716                         if ((giveup) || bail) {
7717                                 break;
7718                         }
7719                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7720                         if (strq == NULL) {
7721                                 break;
7722                         }
7723                 }
7724                 total_moved += moved_how_much;
7725                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7726                 goal_mtu &= 0xfffffffc;
7727         }
7728         if (bail)
7729                 *quit_now = 1;
7730
7731         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7732
7733         if (total_moved == 0) {
7734                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7735                     (net == stcb->asoc.primary_destination)) {
7736                         /* ran dry for primary network net */
7737                         SCTP_STAT_INCR(sctps_primary_randry);
7738                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7739                         /* ran dry with CMT on */
7740                         SCTP_STAT_INCR(sctps_cmt_randry);
7741                 }
7742         }
7743 }
7744
7745 void
7746 sctp_fix_ecn_echo(struct sctp_association *asoc)
7747 {
7748         struct sctp_tmit_chunk *chk;
7749
7750         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7751                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7752                         chk->sent = SCTP_DATAGRAM_UNSENT;
7753                 }
7754         }
7755 }
7756
7757 void
7758 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7759 {
7760         struct sctp_association *asoc;
7761         struct sctp_tmit_chunk *chk;
7762         struct sctp_stream_queue_pending *sp;
7763         unsigned int i;
7764
7765         if (net == NULL) {
7766                 return;
7767         }
7768         asoc = &stcb->asoc;
7769         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7770                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7771                         if (sp->net == net) {
7772                                 sctp_free_remote_addr(sp->net);
7773                                 sp->net = NULL;
7774                         }
7775                 }
7776         }
7777         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7778                 if (chk->whoTo == net) {
7779                         sctp_free_remote_addr(chk->whoTo);
7780                         chk->whoTo = NULL;
7781                 }
7782         }
7783 }
7784
7785 int
7786 sctp_med_chunk_output(struct sctp_inpcb *inp,
7787     struct sctp_tcb *stcb,
7788     struct sctp_association *asoc,
7789     int *num_out,
7790     int *reason_code,
7791     int control_only, int from_where,
7792     struct timeval *now, int *now_filled, int frag_point, int so_locked
7793 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7794     SCTP_UNUSED
7795 #endif
7796 )
7797 {
7798         /**
7799          * Ok this is the generic chunk service queue. we must do the
7800          * following: - Service the stream queue that is next, moving any
7801          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7802          * LAST to the out queue in one pass) and assigning TSN's - Check to
7803          * see if the cwnd/rwnd allows any output, if so we go ahead and
7804          * fomulate and send the low level chunks. Making sure to combine
7805          * any control in the control chunk queue also.
7806          */
7807         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7808         struct mbuf *outchain, *endoutchain;
7809         struct sctp_tmit_chunk *chk, *nchk;
7810
7811         /* temp arrays for unlinking */
7812         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7813         int no_fragmentflg, error;
7814         unsigned int max_rwnd_per_dest, max_send_per_dest;
7815         int one_chunk, hbflag, skip_data_for_this_net;
7816         int asconf, cookie, no_out_cnt;
7817         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7818         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7819         int tsns_sent = 0;
7820         uint32_t auth_offset = 0;
7821         struct sctp_auth_chunk *auth = NULL;
7822         uint16_t auth_keyid;
7823         int override_ok = 1;
7824         int skip_fill_up = 0;
7825         int data_auth_reqd = 0;
7826
7827         /*
7828          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7829          * destination.
7830          */
7831         int quit_now = 0;
7832
7833         *num_out = 0;
7834         *reason_code = 0;
7835         auth_keyid = stcb->asoc.authinfo.active_keyid;
7836         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7837             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7838             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7839                 eeor_mode = 1;
7840         } else {
7841                 eeor_mode = 0;
7842         }
7843         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7844         /*
7845          * First lets prime the pump. For each destination, if there is room
7846          * in the flight size, attempt to pull an MTU's worth out of the
7847          * stream queues into the general send_queue
7848          */
7849 #ifdef SCTP_AUDITING_ENABLED
7850         sctp_audit_log(0xC2, 2);
7851 #endif
7852         SCTP_TCB_LOCK_ASSERT(stcb);
7853         hbflag = 0;
7854         if (control_only)
7855                 no_data_chunks = 1;
7856         else
7857                 no_data_chunks = 0;
7858
7859         /* Nothing to possible to send? */
7860         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7861             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7862             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7863             TAILQ_EMPTY(&asoc->send_queue) &&
7864             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7865 nothing_to_send:
7866                 *reason_code = 9;
7867                 return (0);
7868         }
7869         if (asoc->peers_rwnd == 0) {
7870                 /* No room in peers rwnd */
7871                 *reason_code = 1;
7872                 if (asoc->total_flight > 0) {
7873                         /* we are allowed one chunk in flight */
7874                         no_data_chunks = 1;
7875                 }
7876         }
7877         if (stcb->asoc.ecn_echo_cnt_onq) {
7878                 /* Record where a sack goes, if any */
7879                 if (no_data_chunks &&
7880                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7881                         /* Nothing but ECNe to send - we don't do that */
7882                         goto nothing_to_send;
7883                 }
7884                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7885                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7886                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7887                                 sack_goes_to = chk->whoTo;
7888                                 break;
7889                         }
7890                 }
7891         }
7892         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7893         if (stcb->sctp_socket)
7894                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7895         else
7896                 max_send_per_dest = 0;
7897         if (no_data_chunks == 0) {
7898                 /* How many non-directed chunks are there? */
7899                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7900                         if (chk->whoTo == NULL) {
7901                                 /*
7902                                  * We already have non-directed chunks on
7903                                  * the queue, no need to do a fill-up.
7904                                  */
7905                                 skip_fill_up = 1;
7906                                 break;
7907                         }
7908                 }
7909
7910         }
7911         if ((no_data_chunks == 0) &&
7912             (skip_fill_up == 0) &&
7913             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7914                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7915                         /*
7916                          * This for loop we are in takes in each net, if
7917                          * its's got space in cwnd and has data sent to it
7918                          * (when CMT is off) then it calls
7919                          * sctp_fill_outqueue for the net. This gets data on
7920                          * the send queue for that network.
7921                          *
7922                          * In sctp_fill_outqueue TSN's are assigned and data is
7923                          * copied out of the stream buffers. Note mostly
7924                          * copy by reference (we hope).
7925                          */
7926                         net->window_probe = 0;
7927                         if ((net != stcb->asoc.alternate) &&
7928                             ((net->dest_state & SCTP_ADDR_PF) ||
7929                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7930                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7931                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7932                                         sctp_log_cwnd(stcb, net, 1,
7933                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7934                                 }
7935                                 continue;
7936                         }
7937                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7938                             (net->flight_size == 0)) {
7939                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7940                         }
7941                         if (net->flight_size >= net->cwnd) {
7942                                 /* skip this network, no room - can't fill */
7943                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7944                                         sctp_log_cwnd(stcb, net, 3,
7945                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7946                                 }
7947                                 continue;
7948                         }
7949                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7950                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7951                         }
7952                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7953                         if (quit_now) {
7954                                 /* memory alloc failure */
7955                                 no_data_chunks = 1;
7956                                 break;
7957                         }
7958                 }
7959         }
7960         /* now service each destination and send out what we can for it */
7961         /* Nothing to send? */
7962         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7963             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7964             TAILQ_EMPTY(&asoc->send_queue)) {
7965                 *reason_code = 8;
7966                 return (0);
7967         }
7968         if (asoc->sctp_cmt_on_off > 0) {
7969                 /* get the last start point */
7970                 start_at = asoc->last_net_cmt_send_started;
7971                 if (start_at == NULL) {
7972                         /* null so to beginning */
7973                         start_at = TAILQ_FIRST(&asoc->nets);
7974                 } else {
7975                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7976                         if (start_at == NULL) {
7977                                 start_at = TAILQ_FIRST(&asoc->nets);
7978                         }
7979                 }
7980                 asoc->last_net_cmt_send_started = start_at;
7981         } else {
7982                 start_at = TAILQ_FIRST(&asoc->nets);
7983         }
7984         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7985                 if (chk->whoTo == NULL) {
7986                         if (asoc->alternate) {
7987                                 chk->whoTo = asoc->alternate;
7988                         } else {
7989                                 chk->whoTo = asoc->primary_destination;
7990                         }
7991                         atomic_add_int(&chk->whoTo->ref_count, 1);
7992                 }
7993         }
7994         old_start_at = NULL;
7995 again_one_more_time:
7996         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7997                 /* how much can we send? */
7998                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7999                 if (old_start_at && (old_start_at == net)) {
8000                         /* through list ocmpletely. */
8001                         break;
8002                 }
8003                 tsns_sent = 0xa;
8004                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8005                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8006                     (net->flight_size >= net->cwnd)) {
8007                         /*
8008                          * Nothing on control or asconf and flight is full,
8009                          * we can skip even in the CMT case.
8010                          */
8011                         continue;
8012                 }
8013                 bundle_at = 0;
8014                 endoutchain = outchain = NULL;
8015                 no_fragmentflg = 1;
8016                 one_chunk = 0;
8017                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8018                         skip_data_for_this_net = 1;
8019                 } else {
8020                         skip_data_for_this_net = 0;
8021                 }
8022                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
8023                         /*
8024                          * if we have a route and an ifp check to see if we
8025                          * have room to send to this guy
8026                          */
8027                         struct ifnet *ifp;
8028
8029                         ifp = net->ro.ro_rt->rt_ifp;
8030                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
8031                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
8032                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
8033                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
8034                                 }
8035                                 continue;
8036                         }
8037                 }
8038                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8039 #ifdef INET
8040                 case AF_INET:
8041                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8042                         break;
8043 #endif
8044 #ifdef INET6
8045                 case AF_INET6:
8046                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8047                         break;
8048 #endif
8049                 default:
8050                         /* TSNH */
8051                         mtu = net->mtu;
8052                         break;
8053                 }
8054                 mx_mtu = mtu;
8055                 to_out = 0;
8056                 if (mtu > asoc->peers_rwnd) {
8057                         if (asoc->total_flight > 0) {
8058                                 /* We have a packet in flight somewhere */
8059                                 r_mtu = asoc->peers_rwnd;
8060                         } else {
8061                                 /* We are always allowed to send one MTU out */
8062                                 one_chunk = 1;
8063                                 r_mtu = mtu;
8064                         }
8065                 } else {
8066                         r_mtu = mtu;
8067                 }
8068                 error = 0;
8069                 /************************/
8070                 /* ASCONF transmission */
8071                 /************************/
8072                 /* Now first lets go through the asconf queue */
8073                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8074                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8075                                 continue;
8076                         }
8077                         if (chk->whoTo == NULL) {
8078                                 if (asoc->alternate == NULL) {
8079                                         if (asoc->primary_destination != net) {
8080                                                 break;
8081                                         }
8082                                 } else {
8083                                         if (asoc->alternate != net) {
8084                                                 break;
8085                                         }
8086                                 }
8087                         } else {
8088                                 if (chk->whoTo != net) {
8089                                         break;
8090                                 }
8091                         }
8092                         if (chk->data == NULL) {
8093                                 break;
8094                         }
8095                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8096                             chk->sent != SCTP_DATAGRAM_RESEND) {
8097                                 break;
8098                         }
8099                         /*
8100                          * if no AUTH is yet included and this chunk
8101                          * requires it, make sure to account for it.  We
8102                          * don't apply the size until the AUTH chunk is
8103                          * actually added below in case there is no room for
8104                          * this chunk. NOTE: we overload the use of "omtu"
8105                          * here
8106                          */
8107                         if ((auth == NULL) &&
8108                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8109                             stcb->asoc.peer_auth_chunks)) {
8110                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8111                         } else
8112                                 omtu = 0;
8113                         /* Here we do NOT factor the r_mtu */
8114                         if ((chk->send_size < (int)(mtu - omtu)) ||
8115                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8116                                 /*
8117                                  * We probably should glom the mbuf chain
8118                                  * from the chk->data for control but the
8119                                  * problem is it becomes yet one more level
8120                                  * of tracking to do if for some reason
8121                                  * output fails. Then I have got to
8122                                  * reconstruct the merged control chain.. el
8123                                  * yucko.. for now we take the easy way and
8124                                  * do the copy
8125                                  */
8126                                 /*
8127                                  * Add an AUTH chunk, if chunk requires it
8128                                  * save the offset into the chain for AUTH
8129                                  */
8130                                 if ((auth == NULL) &&
8131                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8132                                     stcb->asoc.peer_auth_chunks))) {
8133                                         outchain = sctp_add_auth_chunk(outchain,
8134                                             &endoutchain,
8135                                             &auth,
8136                                             &auth_offset,
8137                                             stcb,
8138                                             chk->rec.chunk_id.id);
8139                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8140                                 }
8141                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8142                                     (int)chk->rec.chunk_id.can_take_data,
8143                                     chk->send_size, chk->copy_by_ref);
8144                                 if (outchain == NULL) {
8145                                         *reason_code = 8;
8146                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8147                                         return (ENOMEM);
8148                                 }
8149                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8150                                 /* update our MTU size */
8151                                 if (mtu > (chk->send_size + omtu))
8152                                         mtu -= (chk->send_size + omtu);
8153                                 else
8154                                         mtu = 0;
8155                                 to_out += (chk->send_size + omtu);
8156                                 /* Do clear IP_DF ? */
8157                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8158                                         no_fragmentflg = 0;
8159                                 }
8160                                 if (chk->rec.chunk_id.can_take_data)
8161                                         chk->data = NULL;
8162                                 /*
8163                                  * set hb flag since we can use these for
8164                                  * RTO
8165                                  */
8166                                 hbflag = 1;
8167                                 asconf = 1;
8168                                 /*
8169                                  * should sysctl this: don't bundle data
8170                                  * with ASCONF since it requires AUTH
8171                                  */
8172                                 no_data_chunks = 1;
8173                                 chk->sent = SCTP_DATAGRAM_SENT;
8174                                 if (chk->whoTo == NULL) {
8175                                         chk->whoTo = net;
8176                                         atomic_add_int(&net->ref_count, 1);
8177                                 }
8178                                 chk->snd_count++;
8179                                 if (mtu == 0) {
8180                                         /*
8181                                          * Ok we are out of room but we can
8182                                          * output without effecting the
8183                                          * flight size since this little guy
8184                                          * is a control only packet.
8185                                          */
8186                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8187                                         /*
8188                                          * do NOT clear the asconf flag as
8189                                          * it is used to do appropriate
8190                                          * source address selection.
8191                                          */
8192                                         if (*now_filled == 0) {
8193                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8194                                                 *now_filled = 1;
8195                                         }
8196                                         net->last_sent_time = *now;
8197                                         hbflag = 0;
8198                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8199                                             (struct sockaddr *)&net->ro._l_addr,
8200                                             outchain, auth_offset, auth,
8201                                             stcb->asoc.authinfo.active_keyid,
8202                                             no_fragmentflg, 0, asconf,
8203                                             inp->sctp_lport, stcb->rport,
8204                                             htonl(stcb->asoc.peer_vtag),
8205                                             net->port, NULL,
8206                                             0, 0,
8207                                             so_locked))) {
8208                                                 /*
8209                                                  * error, we could not
8210                                                  * output
8211                                                  */
8212                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8213                                                 if (from_where == 0) {
8214                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8215                                                 }
8216                                                 if (error == ENOBUFS) {
8217                                                         asoc->ifp_had_enobuf = 1;
8218                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8219                                                 }
8220                                                 /* error, could not output */
8221                                                 if (error == EHOSTUNREACH) {
8222                                                         /*
8223                                                          * Destination went
8224                                                          * unreachable
8225                                                          * during this send
8226                                                          */
8227                                                         sctp_move_chunks_from_net(stcb, net);
8228                                                 }
8229                                                 *reason_code = 7;
8230                                                 break;
8231                                         } else {
8232                                                 asoc->ifp_had_enobuf = 0;
8233                                         }
8234                                         /*
8235                                          * increase the number we sent, if a
8236                                          * cookie is sent we don't tell them
8237                                          * any was sent out.
8238                                          */
8239                                         outchain = endoutchain = NULL;
8240                                         auth = NULL;
8241                                         auth_offset = 0;
8242                                         if (!no_out_cnt)
8243                                                 *num_out += ctl_cnt;
8244                                         /* recalc a clean slate and setup */
8245                                         switch (net->ro._l_addr.sa.sa_family) {
8246 #ifdef INET
8247                                         case AF_INET:
8248                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8249                                                 break;
8250 #endif
8251 #ifdef INET6
8252                                         case AF_INET6:
8253                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8254                                                 break;
8255 #endif
8256                                         default:
8257                                                 /* TSNH */
8258                                                 mtu = net->mtu;
8259                                                 break;
8260                                         }
8261                                         to_out = 0;
8262                                         no_fragmentflg = 1;
8263                                 }
8264                         }
8265                 }
8266                 if (error != 0) {
8267                         /* try next net */
8268                         continue;
8269                 }
8270                 /************************/
8271                 /* Control transmission */
8272                 /************************/
8273                 /* Now first lets go through the control queue */
8274                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8275                         if ((sack_goes_to) &&
8276                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8277                             (chk->whoTo != sack_goes_to)) {
8278                                 /*
8279                                  * if we have a sack in queue, and we are
8280                                  * looking at an ecn echo that is NOT queued
8281                                  * to where the sack is going..
8282                                  */
8283                                 if (chk->whoTo == net) {
8284                                         /*
8285                                          * Don't transmit it to where its
8286                                          * going (current net)
8287                                          */
8288                                         continue;
8289                                 } else if (sack_goes_to == net) {
8290                                         /*
8291                                          * But do transmit it to this
8292                                          * address
8293                                          */
8294                                         goto skip_net_check;
8295                                 }
8296                         }
8297                         if (chk->whoTo == NULL) {
8298                                 if (asoc->alternate == NULL) {
8299                                         if (asoc->primary_destination != net) {
8300                                                 continue;
8301                                         }
8302                                 } else {
8303                                         if (asoc->alternate != net) {
8304                                                 continue;
8305                                         }
8306                                 }
8307                         } else {
8308                                 if (chk->whoTo != net) {
8309                                         continue;
8310                                 }
8311                         }
8312         skip_net_check:
8313                         if (chk->data == NULL) {
8314                                 continue;
8315                         }
8316                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8317                                 /*
8318                                  * It must be unsent. Cookies and ASCONF's
8319                                  * hang around but there timers will force
8320                                  * when marked for resend.
8321                                  */
8322                                 continue;
8323                         }
8324                         /*
8325                          * if no AUTH is yet included and this chunk
8326                          * requires it, make sure to account for it.  We
8327                          * don't apply the size until the AUTH chunk is
8328                          * actually added below in case there is no room for
8329                          * this chunk. NOTE: we overload the use of "omtu"
8330                          * here
8331                          */
8332                         if ((auth == NULL) &&
8333                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8334                             stcb->asoc.peer_auth_chunks)) {
8335                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8336                         } else
8337                                 omtu = 0;
8338                         /* Here we do NOT factor the r_mtu */
8339                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8340                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8341                                 /*
8342                                  * We probably should glom the mbuf chain
8343                                  * from the chk->data for control but the
8344                                  * problem is it becomes yet one more level
8345                                  * of tracking to do if for some reason
8346                                  * output fails. Then I have got to
8347                                  * reconstruct the merged control chain.. el
8348                                  * yucko.. for now we take the easy way and
8349                                  * do the copy
8350                                  */
8351                                 /*
8352                                  * Add an AUTH chunk, if chunk requires it
8353                                  * save the offset into the chain for AUTH
8354                                  */
8355                                 if ((auth == NULL) &&
8356                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8357                                     stcb->asoc.peer_auth_chunks))) {
8358                                         outchain = sctp_add_auth_chunk(outchain,
8359                                             &endoutchain,
8360                                             &auth,
8361                                             &auth_offset,
8362                                             stcb,
8363                                             chk->rec.chunk_id.id);
8364                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8365                                 }
8366                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8367                                     (int)chk->rec.chunk_id.can_take_data,
8368                                     chk->send_size, chk->copy_by_ref);
8369                                 if (outchain == NULL) {
8370                                         *reason_code = 8;
8371                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8372                                         return (ENOMEM);
8373                                 }
8374                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8375                                 /* update our MTU size */
8376                                 if (mtu > (chk->send_size + omtu))
8377                                         mtu -= (chk->send_size + omtu);
8378                                 else
8379                                         mtu = 0;
8380                                 to_out += (chk->send_size + omtu);
8381                                 /* Do clear IP_DF ? */
8382                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8383                                         no_fragmentflg = 0;
8384                                 }
8385                                 if (chk->rec.chunk_id.can_take_data)
8386                                         chk->data = NULL;
8387                                 /* Mark things to be removed, if needed */
8388                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8389                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8390                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8391                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8392                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8393                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8394                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8395                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8396                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8397                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8398                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8399                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8400                                                 hbflag = 1;
8401                                         }
8402                                         /* remove these chunks at the end */
8403                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8404                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8405                                                 /* turn off the timer */
8406                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8407                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8408                                                             inp, stcb, net,
8409                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8410                                                 }
8411                                         }
8412                                         ctl_cnt++;
8413                                 } else {
8414                                         /*
8415                                          * Other chunks, since they have
8416                                          * timers running (i.e. COOKIE) we
8417                                          * just "trust" that it gets sent or
8418                                          * retransmitted.
8419                                          */
8420                                         ctl_cnt++;
8421                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8422                                                 cookie = 1;
8423                                                 no_out_cnt = 1;
8424                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8425                                                 /*
8426                                                  * Increment ecne send count
8427                                                  * here this means we may be
8428                                                  * over-zealous in our
8429                                                  * counting if the send
8430                                                  * fails, but its the best
8431                                                  * place to do it (we used
8432                                                  * to do it in the queue of
8433                                                  * the chunk, but that did
8434                                                  * not tell how many times
8435                                                  * it was sent.
8436                                                  */
8437                                                 SCTP_STAT_INCR(sctps_sendecne);
8438                                         }
8439                                         chk->sent = SCTP_DATAGRAM_SENT;
8440                                         if (chk->whoTo == NULL) {
8441                                                 chk->whoTo = net;
8442                                                 atomic_add_int(&net->ref_count, 1);
8443                                         }
8444                                         chk->snd_count++;
8445                                 }
8446                                 if (mtu == 0) {
8447                                         /*
8448                                          * Ok we are out of room but we can
8449                                          * output without effecting the
8450                                          * flight size since this little guy
8451                                          * is a control only packet.
8452                                          */
8453                                         if (asconf) {
8454                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8455                                                 /*
8456                                                  * do NOT clear the asconf
8457                                                  * flag as it is used to do
8458                                                  * appropriate source
8459                                                  * address selection.
8460                                                  */
8461                                         }
8462                                         if (cookie) {
8463                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8464                                                 cookie = 0;
8465                                         }
8466                                         /* Only HB or ASCONF advances time */
8467                                         if (hbflag) {
8468                                                 if (*now_filled == 0) {
8469                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8470                                                         *now_filled = 1;
8471                                                 }
8472                                                 net->last_sent_time = *now;
8473                                                 hbflag = 0;
8474                                         }
8475                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8476                                             (struct sockaddr *)&net->ro._l_addr,
8477                                             outchain,
8478                                             auth_offset, auth,
8479                                             stcb->asoc.authinfo.active_keyid,
8480                                             no_fragmentflg, 0, asconf,
8481                                             inp->sctp_lport, stcb->rport,
8482                                             htonl(stcb->asoc.peer_vtag),
8483                                             net->port, NULL,
8484                                             0, 0,
8485                                             so_locked))) {
8486                                                 /*
8487                                                  * error, we could not
8488                                                  * output
8489                                                  */
8490                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8491                                                 if (from_where == 0) {
8492                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8493                                                 }
8494                                                 if (error == ENOBUFS) {
8495                                                         asoc->ifp_had_enobuf = 1;
8496                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8497                                                 }
8498                                                 if (error == EHOSTUNREACH) {
8499                                                         /*
8500                                                          * Destination went
8501                                                          * unreachable
8502                                                          * during this send
8503                                                          */
8504                                                         sctp_move_chunks_from_net(stcb, net);
8505                                                 }
8506                                                 *reason_code = 7;
8507                                                 break;
8508                                         } else {
8509                                                 asoc->ifp_had_enobuf = 0;
8510                                         }
8511                                         /*
8512                                          * increase the number we sent, if a
8513                                          * cookie is sent we don't tell them
8514                                          * any was sent out.
8515                                          */
8516                                         outchain = endoutchain = NULL;
8517                                         auth = NULL;
8518                                         auth_offset = 0;
8519                                         if (!no_out_cnt)
8520                                                 *num_out += ctl_cnt;
8521                                         /* recalc a clean slate and setup */
8522                                         switch (net->ro._l_addr.sa.sa_family) {
8523 #ifdef INET
8524                                         case AF_INET:
8525                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8526                                                 break;
8527 #endif
8528 #ifdef INET6
8529                                         case AF_INET6:
8530                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8531                                                 break;
8532 #endif
8533                                         default:
8534                                                 /* TSNH */
8535                                                 mtu = net->mtu;
8536                                                 break;
8537                                         }
8538                                         to_out = 0;
8539                                         no_fragmentflg = 1;
8540                                 }
8541                         }
8542                 }
8543                 if (error != 0) {
8544                         /* try next net */
8545                         continue;
8546                 }
8547                 /* JRI: if dest is in PF state, do not send data to it */
8548                 if ((asoc->sctp_cmt_on_off > 0) &&
8549                     (net != stcb->asoc.alternate) &&
8550                     (net->dest_state & SCTP_ADDR_PF)) {
8551                         goto no_data_fill;
8552                 }
8553                 if (net->flight_size >= net->cwnd) {
8554                         goto no_data_fill;
8555                 }
8556                 if ((asoc->sctp_cmt_on_off > 0) &&
8557                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8558                     (net->flight_size > max_rwnd_per_dest)) {
8559                         goto no_data_fill;
8560                 }
8561                 /*
8562                  * We need a specific accounting for the usage of the send
8563                  * buffer. We also need to check the number of messages per
8564                  * net. For now, this is better than nothing and it disabled
8565                  * by default...
8566                  */
8567                 if ((asoc->sctp_cmt_on_off > 0) &&
8568                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8569                     (max_send_per_dest > 0) &&
8570                     (net->flight_size > max_send_per_dest)) {
8571                         goto no_data_fill;
8572                 }
8573                 /*********************/
8574                 /* Data transmission */
8575                 /*********************/
8576                 /*
8577                  * if AUTH for DATA is required and no AUTH has been added
8578                  * yet, account for this in the mtu now... if no data can be
8579                  * bundled, this adjustment won't matter anyways since the
8580                  * packet will be going out...
8581                  */
8582                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8583                     stcb->asoc.peer_auth_chunks);
8584                 if (data_auth_reqd && (auth == NULL)) {
8585                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8586                 }
8587                 /* now lets add any data within the MTU constraints */
8588                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8589 #ifdef INET
8590                 case AF_INET:
8591                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8592                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8593                         else
8594                                 omtu = 0;
8595                         break;
8596 #endif
8597 #ifdef INET6
8598                 case AF_INET6:
8599                         if (net->mtu > SCTP_MIN_OVERHEAD)
8600                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8601                         else
8602                                 omtu = 0;
8603                         break;
8604 #endif
8605                 default:
8606                         /* TSNH */
8607                         omtu = 0;
8608                         break;
8609                 }
8610                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8611                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8612                     (skip_data_for_this_net == 0)) ||
8613                     (cookie)) {
8614                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8615                                 if (no_data_chunks) {
8616                                         /* let only control go out */
8617                                         *reason_code = 1;
8618                                         break;
8619                                 }
8620                                 if (net->flight_size >= net->cwnd) {
8621                                         /* skip this net, no room for data */
8622                                         *reason_code = 2;
8623                                         break;
8624                                 }
8625                                 if ((chk->whoTo != NULL) &&
8626                                     (chk->whoTo != net)) {
8627                                         /* Don't send the chunk on this net */
8628                                         continue;
8629                                 }
8630                                 if (asoc->sctp_cmt_on_off == 0) {
8631                                         if ((asoc->alternate) &&
8632                                             (asoc->alternate != net) &&
8633                                             (chk->whoTo == NULL)) {
8634                                                 continue;
8635                                         } else if ((net != asoc->primary_destination) &&
8636                                                     (asoc->alternate == NULL) &&
8637                                             (chk->whoTo == NULL)) {
8638                                                 continue;
8639                                         }
8640                                 }
8641                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8642                                         /*-
8643                                          * strange, we have a chunk that is
8644                                          * to big for its destination and
8645                                          * yet no fragment ok flag.
8646                                          * Something went wrong when the
8647                                          * PMTU changed...we did not mark
8648                                          * this chunk for some reason?? I
8649                                          * will fix it here by letting IP
8650                                          * fragment it for now and printing
8651                                          * a warning. This really should not
8652                                          * happen ...
8653                                          */
8654                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8655                                             chk->send_size, mtu);
8656                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8657                                 }
8658                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8659                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8660                                         struct sctp_data_chunk *dchkh;
8661
8662                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8663                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8664                                 }
8665                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8666                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8667                                         /* ok we will add this one */
8668
8669                                         /*
8670                                          * Add an AUTH chunk, if chunk
8671                                          * requires it, save the offset into
8672                                          * the chain for AUTH
8673                                          */
8674                                         if (data_auth_reqd) {
8675                                                 if (auth == NULL) {
8676                                                         outchain = sctp_add_auth_chunk(outchain,
8677                                                             &endoutchain,
8678                                                             &auth,
8679                                                             &auth_offset,
8680                                                             stcb,
8681                                                             SCTP_DATA);
8682                                                         auth_keyid = chk->auth_keyid;
8683                                                         override_ok = 0;
8684                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8685                                                 } else if (override_ok) {
8686                                                         /*
8687                                                          * use this data's
8688                                                          * keyid
8689                                                          */
8690                                                         auth_keyid = chk->auth_keyid;
8691                                                         override_ok = 0;
8692                                                 } else if (auth_keyid != chk->auth_keyid) {
8693                                                         /*
8694                                                          * different keyid,
8695                                                          * so done bundling
8696                                                          */
8697                                                         break;
8698                                                 }
8699                                         }
8700                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8701                                             chk->send_size, chk->copy_by_ref);
8702                                         if (outchain == NULL) {
8703                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8704                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8705                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8706                                                 }
8707                                                 *reason_code = 3;
8708                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8709                                                 return (ENOMEM);
8710                                         }
8711                                         /* upate our MTU size */
8712                                         /* Do clear IP_DF ? */
8713                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8714                                                 no_fragmentflg = 0;
8715                                         }
8716                                         /* unsigned subtraction of mtu */
8717                                         if (mtu > chk->send_size)
8718                                                 mtu -= chk->send_size;
8719                                         else
8720                                                 mtu = 0;
8721                                         /* unsigned subtraction of r_mtu */
8722                                         if (r_mtu > chk->send_size)
8723                                                 r_mtu -= chk->send_size;
8724                                         else
8725                                                 r_mtu = 0;
8726
8727                                         to_out += chk->send_size;
8728                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8729 #ifdef INVARIANTS
8730                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8731 #else
8732                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8733                                                     mx_mtu, to_out);
8734 #endif
8735                                         }
8736                                         chk->window_probe = 0;
8737                                         data_list[bundle_at++] = chk;
8738                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8739                                                 break;
8740                                         }
8741                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8742                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8743                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8744                                                 } else {
8745                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8746                                                 }
8747                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8748                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8749                                                         /*
8750                                                          * Count number of
8751                                                          * user msg's that
8752                                                          * were fragmented
8753                                                          * we do this by
8754                                                          * counting when we
8755                                                          * see a LAST
8756                                                          * fragment only.
8757                                                          */
8758                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8759                                         }
8760                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8761                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8762                                                         data_list[0]->window_probe = 1;
8763                                                         net->window_probe = 1;
8764                                                 }
8765                                                 break;
8766                                         }
8767                                 } else {
8768                                         /*
8769                                          * Must be sent in order of the
8770                                          * TSN's (on a network)
8771                                          */
8772                                         break;
8773                                 }
8774                         }       /* for (chunk gather loop for this net) */
8775                 }               /* if asoc.state OPEN */
8776 no_data_fill:
8777                 /* Is there something to send for this destination? */
8778                 if (outchain) {
8779                         /* We may need to start a control timer or two */
8780                         if (asconf) {
8781                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8782                                     stcb, net);
8783                                 /*
8784                                  * do NOT clear the asconf flag as it is
8785                                  * used to do appropriate source address
8786                                  * selection.
8787                                  */
8788                         }
8789                         if (cookie) {
8790                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8791                                 cookie = 0;
8792                         }
8793                         /* must start a send timer if data is being sent */
8794                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8795                                 /*
8796                                  * no timer running on this destination
8797                                  * restart it.
8798                                  */
8799                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8800                         }
8801                         if (bundle_at || hbflag) {
8802                                 /* For data/asconf and hb set time */
8803                                 if (*now_filled == 0) {
8804                                         (void)SCTP_GETTIME_TIMEVAL(now);
8805                                         *now_filled = 1;
8806                                 }
8807                                 net->last_sent_time = *now;
8808                         }
8809                         /* Now send it, if there is anything to send :> */
8810                         if ((error = sctp_lowlevel_chunk_output(inp,
8811                             stcb,
8812                             net,
8813                             (struct sockaddr *)&net->ro._l_addr,
8814                             outchain,
8815                             auth_offset,
8816                             auth,
8817                             auth_keyid,
8818                             no_fragmentflg,
8819                             bundle_at,
8820                             asconf,
8821                             inp->sctp_lport, stcb->rport,
8822                             htonl(stcb->asoc.peer_vtag),
8823                             net->port, NULL,
8824                             0, 0,
8825                             so_locked))) {
8826                                 /* error, we could not output */
8827                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8828                                 if (from_where == 0) {
8829                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8830                                 }
8831                                 if (error == ENOBUFS) {
8832                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8833                                         asoc->ifp_had_enobuf = 1;
8834                                 }
8835                                 if (error == EHOSTUNREACH) {
8836                                         /*
8837                                          * Destination went unreachable
8838                                          * during this send
8839                                          */
8840                                         sctp_move_chunks_from_net(stcb, net);
8841                                 }
8842                                 *reason_code = 6;
8843                                 /*-
8844                                  * I add this line to be paranoid. As far as
8845                                  * I can tell the continue, takes us back to
8846                                  * the top of the for, but just to make sure
8847                                  * I will reset these again here.
8848                                  */
8849                                 ctl_cnt = bundle_at = 0;
8850                                 continue;       /* This takes us back to the
8851                                                  * for() for the nets. */
8852                         } else {
8853                                 asoc->ifp_had_enobuf = 0;
8854                         }
8855                         endoutchain = NULL;
8856                         auth = NULL;
8857                         auth_offset = 0;
8858                         if (!no_out_cnt) {
8859                                 *num_out += (ctl_cnt + bundle_at);
8860                         }
8861                         if (bundle_at) {
8862                                 /* setup for a RTO measurement */
8863                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8864                                 /* fill time if not already filled */
8865                                 if (*now_filled == 0) {
8866                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8867                                         *now_filled = 1;
8868                                         *now = asoc->time_last_sent;
8869                                 } else {
8870                                         asoc->time_last_sent = *now;
8871                                 }
8872                                 if (net->rto_needed) {
8873                                         data_list[0]->do_rtt = 1;
8874                                         net->rto_needed = 0;
8875                                 }
8876                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8877                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8878                         }
8879                         if (one_chunk) {
8880                                 break;
8881                         }
8882                 }
8883                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8884                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8885                 }
8886         }
8887         if (old_start_at == NULL) {
8888                 old_start_at = start_at;
8889                 start_at = TAILQ_FIRST(&asoc->nets);
8890                 if (old_start_at)
8891                         goto again_one_more_time;
8892         }
8893         /*
8894          * At the end there should be no NON timed chunks hanging on this
8895          * queue.
8896          */
8897         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8898                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8899         }
8900         if ((*num_out == 0) && (*reason_code == 0)) {
8901                 *reason_code = 4;
8902         } else {
8903                 *reason_code = 5;
8904         }
8905         sctp_clean_up_ctl(stcb, asoc, so_locked);
8906         return (0);
8907 }
8908
8909 void
8910 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8911 {
8912         /*-
8913          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8914          * the control chunk queue.
8915          */
8916         struct sctp_chunkhdr *hdr;
8917         struct sctp_tmit_chunk *chk;
8918         struct mbuf *mat, *last_mbuf;
8919         uint32_t chunk_length;
8920         uint16_t padding_length;
8921
8922         SCTP_TCB_LOCK_ASSERT(stcb);
8923         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8924         if (op_err == NULL) {
8925                 return;
8926         }
8927         last_mbuf = NULL;
8928         chunk_length = 0;
8929         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8930                 chunk_length += SCTP_BUF_LEN(mat);
8931                 if (SCTP_BUF_NEXT(mat) == NULL) {
8932                         last_mbuf = mat;
8933                 }
8934         }
8935         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8936                 sctp_m_freem(op_err);
8937                 return;
8938         }
8939         padding_length = chunk_length % 4;
8940         if (padding_length != 0) {
8941                 padding_length = 4 - padding_length;
8942         }
8943         if (padding_length != 0) {
8944                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8945                         sctp_m_freem(op_err);
8946                         return;
8947                 }
8948         }
8949         sctp_alloc_a_chunk(stcb, chk);
8950         if (chk == NULL) {
8951                 /* no memory */
8952                 sctp_m_freem(op_err);
8953                 return;
8954         }
8955         chk->copy_by_ref = 0;
8956         chk->send_size = (uint16_t) chunk_length;
8957         chk->sent = SCTP_DATAGRAM_UNSENT;
8958         chk->snd_count = 0;
8959         chk->asoc = &stcb->asoc;
8960         chk->data = op_err;
8961         chk->whoTo = NULL;
8962         hdr = mtod(op_err, struct sctp_chunkhdr *);
8963         hdr->chunk_type = SCTP_OPERATION_ERROR;
8964         hdr->chunk_flags = 0;
8965         hdr->chunk_length = htons(chk->send_size);
8966         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8967         chk->asoc->ctrl_queue_cnt++;
8968 }
8969
8970 int
8971 sctp_send_cookie_echo(struct mbuf *m,
8972     int offset,
8973     struct sctp_tcb *stcb,
8974     struct sctp_nets *net)
8975 {
8976         /*-
8977          * pull out the cookie and put it at the front of the control chunk
8978          * queue.
8979          */
8980         int at;
8981         struct mbuf *cookie;
8982         struct sctp_paramhdr parm, *phdr;
8983         struct sctp_chunkhdr *hdr;
8984         struct sctp_tmit_chunk *chk;
8985         uint16_t ptype, plen;
8986
8987         SCTP_TCB_LOCK_ASSERT(stcb);
8988         /* First find the cookie in the param area */
8989         cookie = NULL;
8990         at = offset + sizeof(struct sctp_init_chunk);
8991         for (;;) {
8992                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8993                 if (phdr == NULL) {
8994                         return (-3);
8995                 }
8996                 ptype = ntohs(phdr->param_type);
8997                 plen = ntohs(phdr->param_length);
8998                 if (ptype == SCTP_STATE_COOKIE) {
8999                         int pad;
9000
9001                         /* found the cookie */
9002                         if ((pad = (plen % 4))) {
9003                                 plen += 4 - pad;
9004                         }
9005                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9006                         if (cookie == NULL) {
9007                                 /* No memory */
9008                                 return (-2);
9009                         }
9010 #ifdef SCTP_MBUF_LOGGING
9011                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9012                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9013                         }
9014 #endif
9015                         break;
9016                 }
9017                 at += SCTP_SIZE32(plen);
9018         }
9019         /* ok, we got the cookie lets change it into a cookie echo chunk */
9020         /* first the change from param to cookie */
9021         hdr = mtod(cookie, struct sctp_chunkhdr *);
9022         hdr->chunk_type = SCTP_COOKIE_ECHO;
9023         hdr->chunk_flags = 0;
9024         /* get the chunk stuff now and place it in the FRONT of the queue */
9025         sctp_alloc_a_chunk(stcb, chk);
9026         if (chk == NULL) {
9027                 /* no memory */
9028                 sctp_m_freem(cookie);
9029                 return (-5);
9030         }
9031         chk->copy_by_ref = 0;
9032         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9033         chk->rec.chunk_id.can_take_data = 0;
9034         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9035         chk->send_size = plen;
9036         chk->sent = SCTP_DATAGRAM_UNSENT;
9037         chk->snd_count = 0;
9038         chk->asoc = &stcb->asoc;
9039         chk->data = cookie;
9040         chk->whoTo = net;
9041         atomic_add_int(&chk->whoTo->ref_count, 1);
9042         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9043         chk->asoc->ctrl_queue_cnt++;
9044         return (0);
9045 }
9046
9047 void
9048 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9049     struct mbuf *m,
9050     int offset,
9051     int chk_length,
9052     struct sctp_nets *net)
9053 {
9054         /*
9055          * take a HB request and make it into a HB ack and send it.
9056          */
9057         struct mbuf *outchain;
9058         struct sctp_chunkhdr *chdr;
9059         struct sctp_tmit_chunk *chk;
9060
9061
9062         if (net == NULL)
9063                 /* must have a net pointer */
9064                 return;
9065
9066         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9067         if (outchain == NULL) {
9068                 /* gak out of memory */
9069                 return;
9070         }
9071 #ifdef SCTP_MBUF_LOGGING
9072         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9073                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9074         }
9075 #endif
9076         chdr = mtod(outchain, struct sctp_chunkhdr *);
9077         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9078         chdr->chunk_flags = 0;
9079         if (chk_length % 4) {
9080                 /* need pad */
9081                 uint32_t cpthis = 0;
9082                 int padlen;
9083
9084                 padlen = 4 - (chk_length % 4);
9085                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9086         }
9087         sctp_alloc_a_chunk(stcb, chk);
9088         if (chk == NULL) {
9089                 /* no memory */
9090                 sctp_m_freem(outchain);
9091                 return;
9092         }
9093         chk->copy_by_ref = 0;
9094         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9095         chk->rec.chunk_id.can_take_data = 1;
9096         chk->flags = 0;
9097         chk->send_size = chk_length;
9098         chk->sent = SCTP_DATAGRAM_UNSENT;
9099         chk->snd_count = 0;
9100         chk->asoc = &stcb->asoc;
9101         chk->data = outchain;
9102         chk->whoTo = net;
9103         atomic_add_int(&chk->whoTo->ref_count, 1);
9104         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9105         chk->asoc->ctrl_queue_cnt++;
9106 }
9107
9108 void
9109 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9110 {
9111         /* formulate and queue a cookie-ack back to sender */
9112         struct mbuf *cookie_ack;
9113         struct sctp_chunkhdr *hdr;
9114         struct sctp_tmit_chunk *chk;
9115
9116         SCTP_TCB_LOCK_ASSERT(stcb);
9117
9118         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9119         if (cookie_ack == NULL) {
9120                 /* no mbuf's */
9121                 return;
9122         }
9123         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9124         sctp_alloc_a_chunk(stcb, chk);
9125         if (chk == NULL) {
9126                 /* no memory */
9127                 sctp_m_freem(cookie_ack);
9128                 return;
9129         }
9130         chk->copy_by_ref = 0;
9131         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9132         chk->rec.chunk_id.can_take_data = 1;
9133         chk->flags = 0;
9134         chk->send_size = sizeof(struct sctp_chunkhdr);
9135         chk->sent = SCTP_DATAGRAM_UNSENT;
9136         chk->snd_count = 0;
9137         chk->asoc = &stcb->asoc;
9138         chk->data = cookie_ack;
9139         if (chk->asoc->last_control_chunk_from != NULL) {
9140                 chk->whoTo = chk->asoc->last_control_chunk_from;
9141                 atomic_add_int(&chk->whoTo->ref_count, 1);
9142         } else {
9143                 chk->whoTo = NULL;
9144         }
9145         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9146         hdr->chunk_type = SCTP_COOKIE_ACK;
9147         hdr->chunk_flags = 0;
9148         hdr->chunk_length = htons(chk->send_size);
9149         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9150         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9151         chk->asoc->ctrl_queue_cnt++;
9152         return;
9153 }
9154
9155
9156 void
9157 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9158 {
9159         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9160         struct mbuf *m_shutdown_ack;
9161         struct sctp_shutdown_ack_chunk *ack_cp;
9162         struct sctp_tmit_chunk *chk;
9163
9164         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9165         if (m_shutdown_ack == NULL) {
9166                 /* no mbuf's */
9167                 return;
9168         }
9169         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9170         sctp_alloc_a_chunk(stcb, chk);
9171         if (chk == NULL) {
9172                 /* no memory */
9173                 sctp_m_freem(m_shutdown_ack);
9174                 return;
9175         }
9176         chk->copy_by_ref = 0;
9177         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9178         chk->rec.chunk_id.can_take_data = 1;
9179         chk->flags = 0;
9180         chk->send_size = sizeof(struct sctp_chunkhdr);
9181         chk->sent = SCTP_DATAGRAM_UNSENT;
9182         chk->snd_count = 0;
9183         chk->flags = 0;
9184         chk->asoc = &stcb->asoc;
9185         chk->data = m_shutdown_ack;
9186         chk->whoTo = net;
9187         if (chk->whoTo) {
9188                 atomic_add_int(&chk->whoTo->ref_count, 1);
9189         }
9190         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9191         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9192         ack_cp->ch.chunk_flags = 0;
9193         ack_cp->ch.chunk_length = htons(chk->send_size);
9194         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9195         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9196         chk->asoc->ctrl_queue_cnt++;
9197         return;
9198 }
9199
9200 void
9201 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9202 {
9203         /* formulate and queue a SHUTDOWN to the sender */
9204         struct mbuf *m_shutdown;
9205         struct sctp_shutdown_chunk *shutdown_cp;
9206         struct sctp_tmit_chunk *chk;
9207
9208         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9209         if (m_shutdown == NULL) {
9210                 /* no mbuf's */
9211                 return;
9212         }
9213         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9214         sctp_alloc_a_chunk(stcb, chk);
9215         if (chk == NULL) {
9216                 /* no memory */
9217                 sctp_m_freem(m_shutdown);
9218                 return;
9219         }
9220         chk->copy_by_ref = 0;
9221         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9222         chk->rec.chunk_id.can_take_data = 1;
9223         chk->flags = 0;
9224         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9225         chk->sent = SCTP_DATAGRAM_UNSENT;
9226         chk->snd_count = 0;
9227         chk->flags = 0;
9228         chk->asoc = &stcb->asoc;
9229         chk->data = m_shutdown;
9230         chk->whoTo = net;
9231         if (chk->whoTo) {
9232                 atomic_add_int(&chk->whoTo->ref_count, 1);
9233         }
9234         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9235         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9236         shutdown_cp->ch.chunk_flags = 0;
9237         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9238         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9239         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9240         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9241         chk->asoc->ctrl_queue_cnt++;
9242         return;
9243 }
9244
9245 void
9246 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9247 {
9248         /*
9249          * formulate and queue an ASCONF to the peer. ASCONF parameters
9250          * should be queued on the assoc queue.
9251          */
9252         struct sctp_tmit_chunk *chk;
9253         struct mbuf *m_asconf;
9254         int len;
9255
9256         SCTP_TCB_LOCK_ASSERT(stcb);
9257
9258         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9259             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9260                 /* can't send a new one if there is one in flight already */
9261                 return;
9262         }
9263         /* compose an ASCONF chunk, maximum length is PMTU */
9264         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9265         if (m_asconf == NULL) {
9266                 return;
9267         }
9268         sctp_alloc_a_chunk(stcb, chk);
9269         if (chk == NULL) {
9270                 /* no memory */
9271                 sctp_m_freem(m_asconf);
9272                 return;
9273         }
9274         chk->copy_by_ref = 0;
9275         chk->rec.chunk_id.id = SCTP_ASCONF;
9276         chk->rec.chunk_id.can_take_data = 0;
9277         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9278         chk->data = m_asconf;
9279         chk->send_size = len;
9280         chk->sent = SCTP_DATAGRAM_UNSENT;
9281         chk->snd_count = 0;
9282         chk->asoc = &stcb->asoc;
9283         chk->whoTo = net;
9284         if (chk->whoTo) {
9285                 atomic_add_int(&chk->whoTo->ref_count, 1);
9286         }
9287         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9288         chk->asoc->ctrl_queue_cnt++;
9289         return;
9290 }
9291
9292 void
9293 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9294 {
9295         /*
9296          * formulate and queue a asconf-ack back to sender. the asconf-ack
9297          * must be stored in the tcb.
9298          */
9299         struct sctp_tmit_chunk *chk;
9300         struct sctp_asconf_ack *ack, *latest_ack;
9301         struct mbuf *m_ack;
9302         struct sctp_nets *net = NULL;
9303
9304         SCTP_TCB_LOCK_ASSERT(stcb);
9305         /* Get the latest ASCONF-ACK */
9306         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9307         if (latest_ack == NULL) {
9308                 return;
9309         }
9310         if (latest_ack->last_sent_to != NULL &&
9311             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9312                 /* we're doing a retransmission */
9313                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9314                 if (net == NULL) {
9315                         /* no alternate */
9316                         if (stcb->asoc.last_control_chunk_from == NULL) {
9317                                 if (stcb->asoc.alternate) {
9318                                         net = stcb->asoc.alternate;
9319                                 } else {
9320                                         net = stcb->asoc.primary_destination;
9321                                 }
9322                         } else {
9323                                 net = stcb->asoc.last_control_chunk_from;
9324                         }
9325                 }
9326         } else {
9327                 /* normal case */
9328                 if (stcb->asoc.last_control_chunk_from == NULL) {
9329                         if (stcb->asoc.alternate) {
9330                                 net = stcb->asoc.alternate;
9331                         } else {
9332                                 net = stcb->asoc.primary_destination;
9333                         }
9334                 } else {
9335                         net = stcb->asoc.last_control_chunk_from;
9336                 }
9337         }
9338         latest_ack->last_sent_to = net;
9339
9340         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9341                 if (ack->data == NULL) {
9342                         continue;
9343                 }
9344                 /* copy the asconf_ack */
9345                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9346                 if (m_ack == NULL) {
9347                         /* couldn't copy it */
9348                         return;
9349                 }
9350 #ifdef SCTP_MBUF_LOGGING
9351                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9352                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9353                 }
9354 #endif
9355
9356                 sctp_alloc_a_chunk(stcb, chk);
9357                 if (chk == NULL) {
9358                         /* no memory */
9359                         if (m_ack)
9360                                 sctp_m_freem(m_ack);
9361                         return;
9362                 }
9363                 chk->copy_by_ref = 0;
9364                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9365                 chk->rec.chunk_id.can_take_data = 1;
9366                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9367                 chk->whoTo = net;
9368                 if (chk->whoTo) {
9369                         atomic_add_int(&chk->whoTo->ref_count, 1);
9370                 }
9371                 chk->data = m_ack;
9372                 chk->send_size = ack->len;
9373                 chk->sent = SCTP_DATAGRAM_UNSENT;
9374                 chk->snd_count = 0;
9375                 chk->asoc = &stcb->asoc;
9376
9377                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9378                 chk->asoc->ctrl_queue_cnt++;
9379         }
9380         return;
9381 }
9382
9383
9384 static int
9385 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9386     struct sctp_tcb *stcb,
9387     struct sctp_association *asoc,
9388     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9389 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9390     SCTP_UNUSED
9391 #endif
9392 )
9393 {
9394         /*-
9395          * send out one MTU of retransmission. If fast_retransmit is
9396          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9397          * rwnd. For a Cookie or Asconf in the control chunk queue we
9398          * retransmit them by themselves.
9399          *
9400          * For data chunks we will pick out the lowest TSN's in the sent_queue
9401          * marked for resend and bundle them all together (up to a MTU of
9402          * destination). The address to send to should have been
9403          * selected/changed where the retransmission was marked (i.e. in FR
9404          * or t3-timeout routines).
9405          */
9406         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9407         struct sctp_tmit_chunk *chk, *fwd;
9408         struct mbuf *m, *endofchain;
9409         struct sctp_nets *net = NULL;
9410         uint32_t tsns_sent = 0;
9411         int no_fragmentflg, bundle_at, cnt_thru;
9412         unsigned int mtu;
9413         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9414         struct sctp_auth_chunk *auth = NULL;
9415         uint32_t auth_offset = 0;
9416         uint16_t auth_keyid;
9417         int override_ok = 1;
9418         int data_auth_reqd = 0;
9419         uint32_t dmtu = 0;
9420
9421         SCTP_TCB_LOCK_ASSERT(stcb);
9422         tmr_started = ctl_cnt = bundle_at = error = 0;
9423         no_fragmentflg = 1;
9424         fwd_tsn = 0;
9425         *cnt_out = 0;
9426         fwd = NULL;
9427         endofchain = m = NULL;
9428         auth_keyid = stcb->asoc.authinfo.active_keyid;
9429 #ifdef SCTP_AUDITING_ENABLED
9430         sctp_audit_log(0xC3, 1);
9431 #endif
9432         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9433             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9434                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9435                     asoc->sent_queue_retran_cnt);
9436                 asoc->sent_queue_cnt = 0;
9437                 asoc->sent_queue_cnt_removeable = 0;
9438                 /* send back 0/0 so we enter normal transmission */
9439                 *cnt_out = 0;
9440                 return (0);
9441         }
9442         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9443                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9444                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9445                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9446                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9447                                 continue;
9448                         }
9449                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9450                                 if (chk != asoc->str_reset) {
9451                                         /*
9452                                          * not eligible for retran if its
9453                                          * not ours
9454                                          */
9455                                         continue;
9456                                 }
9457                         }
9458                         ctl_cnt++;
9459                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9460                                 fwd_tsn = 1;
9461                         }
9462                         /*
9463                          * Add an AUTH chunk, if chunk requires it save the
9464                          * offset into the chain for AUTH
9465                          */
9466                         if ((auth == NULL) &&
9467                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9468                             stcb->asoc.peer_auth_chunks))) {
9469                                 m = sctp_add_auth_chunk(m, &endofchain,
9470                                     &auth, &auth_offset,
9471                                     stcb,
9472                                     chk->rec.chunk_id.id);
9473                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9474                         }
9475                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9476                         break;
9477                 }
9478         }
9479         one_chunk = 0;
9480         cnt_thru = 0;
9481         /* do we have control chunks to retransmit? */
9482         if (m != NULL) {
9483                 /* Start a timer no matter if we suceed or fail */
9484                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9485                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9486                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9487                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9488                 chk->snd_count++;       /* update our count */
9489                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9490                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9491                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9492                     no_fragmentflg, 0, 0,
9493                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9494                     chk->whoTo->port, NULL,
9495                     0, 0,
9496                     so_locked))) {
9497                         SCTP_STAT_INCR(sctps_lowlevelerr);
9498                         return (error);
9499                 }
9500                 endofchain = NULL;
9501                 auth = NULL;
9502                 auth_offset = 0;
9503                 /*
9504                  * We don't want to mark the net->sent time here since this
9505                  * we use this for HB and retrans cannot measure RTT
9506                  */
9507                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9508                 *cnt_out += 1;
9509                 chk->sent = SCTP_DATAGRAM_SENT;
9510                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9511                 if (fwd_tsn == 0) {
9512                         return (0);
9513                 } else {
9514                         /* Clean up the fwd-tsn list */
9515                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9516                         return (0);
9517                 }
9518         }
9519         /*
9520          * Ok, it is just data retransmission we need to do or that and a
9521          * fwd-tsn with it all.
9522          */
9523         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9524                 return (SCTP_RETRAN_DONE);
9525         }
9526         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9527             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9528                 /* not yet open, resend the cookie and that is it */
9529                 return (1);
9530         }
9531 #ifdef SCTP_AUDITING_ENABLED
9532         sctp_auditing(20, inp, stcb, NULL);
9533 #endif
9534         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9535         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9536                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9537                         /* No, not sent to this net or not ready for rtx */
9538                         continue;
9539                 }
9540                 if (chk->data == NULL) {
9541                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9542                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9543                         continue;
9544                 }
9545                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9546                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9547                         struct mbuf *op_err;
9548                         char msg[SCTP_DIAG_INFO_LEN];
9549
9550                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9551                             chk->rec.data.TSN_seq, chk->snd_count);
9552                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9553                             msg);
9554                         atomic_add_int(&stcb->asoc.refcnt, 1);
9555                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9556                             so_locked);
9557                         SCTP_TCB_LOCK(stcb);
9558                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9559                         return (SCTP_RETRAN_EXIT);
9560                 }
9561                 /* pick up the net */
9562                 net = chk->whoTo;
9563                 switch (net->ro._l_addr.sa.sa_family) {
9564 #ifdef INET
9565                 case AF_INET:
9566                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9567                         break;
9568 #endif
9569 #ifdef INET6
9570                 case AF_INET6:
9571                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9572                         break;
9573 #endif
9574                 default:
9575                         /* TSNH */
9576                         mtu = net->mtu;
9577                         break;
9578                 }
9579
9580                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9581                         /* No room in peers rwnd */
9582                         uint32_t tsn;
9583
9584                         tsn = asoc->last_acked_seq + 1;
9585                         if (tsn == chk->rec.data.TSN_seq) {
9586                                 /*
9587                                  * we make a special exception for this
9588                                  * case. The peer has no rwnd but is missing
9589                                  * the lowest chunk.. which is probably what
9590                                  * is holding up the rwnd.
9591                                  */
9592                                 goto one_chunk_around;
9593                         }
9594                         return (1);
9595                 }
9596 one_chunk_around:
9597                 if (asoc->peers_rwnd < mtu) {
9598                         one_chunk = 1;
9599                         if ((asoc->peers_rwnd == 0) &&
9600                             (asoc->total_flight == 0)) {
9601                                 chk->window_probe = 1;
9602                                 chk->whoTo->window_probe = 1;
9603                         }
9604                 }
9605 #ifdef SCTP_AUDITING_ENABLED
9606                 sctp_audit_log(0xC3, 2);
9607 #endif
9608                 bundle_at = 0;
9609                 m = NULL;
9610                 net->fast_retran_ip = 0;
9611                 if (chk->rec.data.doing_fast_retransmit == 0) {
9612                         /*
9613                          * if no FR in progress skip destination that have
9614                          * flight_size > cwnd.
9615                          */
9616                         if (net->flight_size >= net->cwnd) {
9617                                 continue;
9618                         }
9619                 } else {
9620                         /*
9621                          * Mark the destination net to have FR recovery
9622                          * limits put on it.
9623                          */
9624                         *fr_done = 1;
9625                         net->fast_retran_ip = 1;
9626                 }
9627
9628                 /*
9629                  * if no AUTH is yet included and this chunk requires it,
9630                  * make sure to account for it.  We don't apply the size
9631                  * until the AUTH chunk is actually added below in case
9632                  * there is no room for this chunk.
9633                  */
9634                 if (data_auth_reqd && (auth == NULL)) {
9635                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9636                 } else
9637                         dmtu = 0;
9638
9639                 if ((chk->send_size <= (mtu - dmtu)) ||
9640                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9641                         /* ok we will add this one */
9642                         if (data_auth_reqd) {
9643                                 if (auth == NULL) {
9644                                         m = sctp_add_auth_chunk(m,
9645                                             &endofchain,
9646                                             &auth,
9647                                             &auth_offset,
9648                                             stcb,
9649                                             SCTP_DATA);
9650                                         auth_keyid = chk->auth_keyid;
9651                                         override_ok = 0;
9652                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9653                                 } else if (override_ok) {
9654                                         auth_keyid = chk->auth_keyid;
9655                                         override_ok = 0;
9656                                 } else if (chk->auth_keyid != auth_keyid) {
9657                                         /* different keyid, so done bundling */
9658                                         break;
9659                                 }
9660                         }
9661                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9662                         if (m == NULL) {
9663                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9664                                 return (ENOMEM);
9665                         }
9666                         /* Do clear IP_DF ? */
9667                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9668                                 no_fragmentflg = 0;
9669                         }
9670                         /* upate our MTU size */
9671                         if (mtu > (chk->send_size + dmtu))
9672                                 mtu -= (chk->send_size + dmtu);
9673                         else
9674                                 mtu = 0;
9675                         data_list[bundle_at++] = chk;
9676                         if (one_chunk && (asoc->total_flight <= 0)) {
9677                                 SCTP_STAT_INCR(sctps_windowprobed);
9678                         }
9679                 }
9680                 if (one_chunk == 0) {
9681                         /*
9682                          * now are there anymore forward from chk to pick
9683                          * up?
9684                          */
9685                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9686                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9687                                         /* Nope, not for retran */
9688                                         continue;
9689                                 }
9690                                 if (fwd->whoTo != net) {
9691                                         /* Nope, not the net in question */
9692                                         continue;
9693                                 }
9694                                 if (data_auth_reqd && (auth == NULL)) {
9695                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9696                                 } else
9697                                         dmtu = 0;
9698                                 if (fwd->send_size <= (mtu - dmtu)) {
9699                                         if (data_auth_reqd) {
9700                                                 if (auth == NULL) {
9701                                                         m = sctp_add_auth_chunk(m,
9702                                                             &endofchain,
9703                                                             &auth,
9704                                                             &auth_offset,
9705                                                             stcb,
9706                                                             SCTP_DATA);
9707                                                         auth_keyid = fwd->auth_keyid;
9708                                                         override_ok = 0;
9709                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9710                                                 } else if (override_ok) {
9711                                                         auth_keyid = fwd->auth_keyid;
9712                                                         override_ok = 0;
9713                                                 } else if (fwd->auth_keyid != auth_keyid) {
9714                                                         /*
9715                                                          * different keyid,
9716                                                          * so done bundling
9717                                                          */
9718                                                         break;
9719                                                 }
9720                                         }
9721                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9722                                         if (m == NULL) {
9723                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9724                                                 return (ENOMEM);
9725                                         }
9726                                         /* Do clear IP_DF ? */
9727                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9728                                                 no_fragmentflg = 0;
9729                                         }
9730                                         /* upate our MTU size */
9731                                         if (mtu > (fwd->send_size + dmtu))
9732                                                 mtu -= (fwd->send_size + dmtu);
9733                                         else
9734                                                 mtu = 0;
9735                                         data_list[bundle_at++] = fwd;
9736                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9737                                                 break;
9738                                         }
9739                                 } else {
9740                                         /* can't fit so we are done */
9741                                         break;
9742                                 }
9743                         }
9744                 }
9745                 /* Is there something to send for this destination? */
9746                 if (m) {
9747                         /*
9748                          * No matter if we fail/or suceed we should start a
9749                          * timer. A failure is like a lost IP packet :-)
9750                          */
9751                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9752                                 /*
9753                                  * no timer running on this destination
9754                                  * restart it.
9755                                  */
9756                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9757                                 tmr_started = 1;
9758                         }
9759                         /* Now lets send it, if there is anything to send :> */
9760                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9761                             (struct sockaddr *)&net->ro._l_addr, m,
9762                             auth_offset, auth, auth_keyid,
9763                             no_fragmentflg, 0, 0,
9764                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9765                             net->port, NULL,
9766                             0, 0,
9767                             so_locked))) {
9768                                 /* error, we could not output */
9769                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9770                                 return (error);
9771                         }
9772                         endofchain = NULL;
9773                         auth = NULL;
9774                         auth_offset = 0;
9775                         /* For HB's */
9776                         /*
9777                          * We don't want to mark the net->sent time here
9778                          * since this we use this for HB and retrans cannot
9779                          * measure RTT
9780                          */
9781                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9782
9783                         /* For auto-close */
9784                         cnt_thru++;
9785                         if (*now_filled == 0) {
9786                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9787                                 *now = asoc->time_last_sent;
9788                                 *now_filled = 1;
9789                         } else {
9790                                 asoc->time_last_sent = *now;
9791                         }
9792                         *cnt_out += bundle_at;
9793 #ifdef SCTP_AUDITING_ENABLED
9794                         sctp_audit_log(0xC4, bundle_at);
9795 #endif
9796                         if (bundle_at) {
9797                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9798                         }
9799                         for (i = 0; i < bundle_at; i++) {
9800                                 SCTP_STAT_INCR(sctps_sendretransdata);
9801                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9802                                 /*
9803                                  * When we have a revoked data, and we
9804                                  * retransmit it, then we clear the revoked
9805                                  * flag since this flag dictates if we
9806                                  * subtracted from the fs
9807                                  */
9808                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9809                                         /* Deflate the cwnd */
9810                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9811                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9812                                 }
9813                                 data_list[i]->snd_count++;
9814                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9815                                 /* record the time */
9816                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9817                                 if (data_list[i]->book_size_scale) {
9818                                         /*
9819                                          * need to double the book size on
9820                                          * this one
9821                                          */
9822                                         data_list[i]->book_size_scale = 0;
9823                                         /*
9824                                          * Since we double the booksize, we
9825                                          * must also double the output queue
9826                                          * size, since this get shrunk when
9827                                          * we free by this amount.
9828                                          */
9829                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9830                                         data_list[i]->book_size *= 2;
9831
9832
9833                                 } else {
9834                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9835                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9836                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9837                                         }
9838                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9839                                             (uint32_t) (data_list[i]->send_size +
9840                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9841                                 }
9842                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9843                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9844                                             data_list[i]->whoTo->flight_size,
9845                                             data_list[i]->book_size,
9846                                             (uintptr_t) data_list[i]->whoTo,
9847                                             data_list[i]->rec.data.TSN_seq);
9848                                 }
9849                                 sctp_flight_size_increase(data_list[i]);
9850                                 sctp_total_flight_increase(stcb, data_list[i]);
9851                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9852                                         /* SWS sender side engages */
9853                                         asoc->peers_rwnd = 0;
9854                                 }
9855                                 if ((i == 0) &&
9856                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9857                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9858                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9859                                             (tmr_started == 0)) {
9860                                                 /*-
9861                                                  * ok we just fast-retrans'd
9862                                                  * the lowest TSN, i.e the
9863                                                  * first on the list. In
9864                                                  * this case we want to give
9865                                                  * some more time to get a
9866                                                  * SACK back without a
9867                                                  * t3-expiring.
9868                                                  */
9869                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9870                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9871                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9872                                         }
9873                                 }
9874                         }
9875                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9876                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9877                         }
9878 #ifdef SCTP_AUDITING_ENABLED
9879                         sctp_auditing(21, inp, stcb, NULL);
9880 #endif
9881                 } else {
9882                         /* None will fit */
9883                         return (1);
9884                 }
9885                 if (asoc->sent_queue_retran_cnt <= 0) {
9886                         /* all done we have no more to retran */
9887                         asoc->sent_queue_retran_cnt = 0;
9888                         break;
9889                 }
9890                 if (one_chunk) {
9891                         /* No more room in rwnd */
9892                         return (1);
9893                 }
9894                 /* stop the for loop here. we sent out a packet */
9895                 break;
9896         }
9897         return (0);
9898 }
9899
9900 static void
9901 sctp_timer_validation(struct sctp_inpcb *inp,
9902     struct sctp_tcb *stcb,
9903     struct sctp_association *asoc)
9904 {
9905         struct sctp_nets *net;
9906
9907         /* Validate that a timer is running somewhere */
9908         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9909                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9910                         /* Here is a timer */
9911                         return;
9912                 }
9913         }
9914         SCTP_TCB_LOCK_ASSERT(stcb);
9915         /* Gak, we did not have a timer somewhere */
9916         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9917         if (asoc->alternate) {
9918                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9919         } else {
9920                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9921         }
9922         return;
9923 }
9924
9925 void
9926 sctp_chunk_output(struct sctp_inpcb *inp,
9927     struct sctp_tcb *stcb,
9928     int from_where,
9929     int so_locked
9930 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9931     SCTP_UNUSED
9932 #endif
9933 )
9934 {
9935         /*-
9936          * Ok this is the generic chunk service queue. we must do the
9937          * following:
9938          * - See if there are retransmits pending, if so we must
9939          *   do these first.
9940          * - Service the stream queue that is next, moving any
9941          *   message (note I must get a complete message i.e.
9942          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9943          *   TSN's
9944          * - Check to see if the cwnd/rwnd allows any output, if so we
9945          *   go ahead and fomulate and send the low level chunks. Making sure
9946          *   to combine any control in the control chunk queue also.
9947          */
9948         struct sctp_association *asoc;
9949         struct sctp_nets *net;
9950         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9951         unsigned int burst_cnt = 0;
9952         struct timeval now;
9953         int now_filled = 0;
9954         int nagle_on;
9955         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9956         int un_sent = 0;
9957         int fr_done;
9958         unsigned int tot_frs = 0;
9959
9960         asoc = &stcb->asoc;
9961 do_it_again:
9962         /* The Nagle algorithm is only applied when handling a send call. */
9963         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9964                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9965                         nagle_on = 0;
9966                 } else {
9967                         nagle_on = 1;
9968                 }
9969         } else {
9970                 nagle_on = 0;
9971         }
9972         SCTP_TCB_LOCK_ASSERT(stcb);
9973
9974         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9975
9976         if ((un_sent <= 0) &&
9977             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9978             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9979             (asoc->sent_queue_retran_cnt == 0) &&
9980             (asoc->trigger_reset == 0)) {
9981                 /* Nothing to do unless there is something to be sent left */
9982                 return;
9983         }
9984         /*
9985          * Do we have something to send, data or control AND a sack timer
9986          * running, if so piggy-back the sack.
9987          */
9988         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9989                 sctp_send_sack(stcb, so_locked);
9990                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9991         }
9992         while (asoc->sent_queue_retran_cnt) {
9993                 /*-
9994                  * Ok, it is retransmission time only, we send out only ONE
9995                  * packet with a single call off to the retran code.
9996                  */
9997                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9998                         /*-
9999                          * Special hook for handling cookiess discarded
10000                          * by peer that carried data. Send cookie-ack only
10001                          * and then the next call with get the retran's.
10002                          */
10003                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10004                             from_where,
10005                             &now, &now_filled, frag_point, so_locked);
10006                         return;
10007                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10008                         /* if its not from a HB then do it */
10009                         fr_done = 0;
10010                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10011                         if (fr_done) {
10012                                 tot_frs++;
10013                         }
10014                 } else {
10015                         /*
10016                          * its from any other place, we don't allow retran
10017                          * output (only control)
10018                          */
10019                         ret = 1;
10020                 }
10021                 if (ret > 0) {
10022                         /* Can't send anymore */
10023                         /*-
10024                          * now lets push out control by calling med-level
10025                          * output once. this assures that we WILL send HB's
10026                          * if queued too.
10027                          */
10028                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10029                             from_where,
10030                             &now, &now_filled, frag_point, so_locked);
10031 #ifdef SCTP_AUDITING_ENABLED
10032                         sctp_auditing(8, inp, stcb, NULL);
10033 #endif
10034                         sctp_timer_validation(inp, stcb, asoc);
10035                         return;
10036                 }
10037                 if (ret < 0) {
10038                         /*-
10039                          * The count was off.. retran is not happening so do
10040                          * the normal retransmission.
10041                          */
10042 #ifdef SCTP_AUDITING_ENABLED
10043                         sctp_auditing(9, inp, stcb, NULL);
10044 #endif
10045                         if (ret == SCTP_RETRAN_EXIT) {
10046                                 return;
10047                         }
10048                         break;
10049                 }
10050                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10051                         /* Only one transmission allowed out of a timeout */
10052 #ifdef SCTP_AUDITING_ENABLED
10053                         sctp_auditing(10, inp, stcb, NULL);
10054 #endif
10055                         /* Push out any control */
10056                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10057                             &now, &now_filled, frag_point, so_locked);
10058                         return;
10059                 }
10060                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10061                         /* Hit FR burst limit */
10062                         return;
10063                 }
10064                 if ((num_out == 0) && (ret == 0)) {
10065                         /* No more retrans to send */
10066                         break;
10067                 }
10068         }
10069 #ifdef SCTP_AUDITING_ENABLED
10070         sctp_auditing(12, inp, stcb, NULL);
10071 #endif
10072         /* Check for bad destinations, if they exist move chunks around. */
10073         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10074                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10075                         /*-
10076                          * if possible move things off of this address we
10077                          * still may send below due to the dormant state but
10078                          * we try to find an alternate address to send to
10079                          * and if we have one we move all queued data on the
10080                          * out wheel to this alternate address.
10081                          */
10082                         if (net->ref_count > 1)
10083                                 sctp_move_chunks_from_net(stcb, net);
10084                 } else {
10085                         /*-
10086                          * if ((asoc->sat_network) || (net->addr_is_local))
10087                          * { burst_limit = asoc->max_burst *
10088                          * SCTP_SAT_NETWORK_BURST_INCR; }
10089                          */
10090                         if (asoc->max_burst > 0) {
10091                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10092                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10093                                                 /*
10094                                                  * JRS - Use the congestion
10095                                                  * control given in the
10096                                                  * congestion control module
10097                                                  */
10098                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10099                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10100                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10101                                                 }
10102                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10103                                         }
10104                                         net->fast_retran_ip = 0;
10105                                 } else {
10106                                         if (net->flight_size == 0) {
10107                                                 /*
10108                                                  * Should be decaying the
10109                                                  * cwnd here
10110                                                  */
10111                                                 ;
10112                                         }
10113                                 }
10114                         }
10115                 }
10116
10117         }
10118         burst_cnt = 0;
10119         do {
10120                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10121                     &reason_code, 0, from_where,
10122                     &now, &now_filled, frag_point, so_locked);
10123                 if (error) {
10124                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10125                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10126                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10127                         }
10128                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10129                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10130                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10131                         }
10132                         break;
10133                 }
10134                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10135
10136                 tot_out += num_out;
10137                 burst_cnt++;
10138                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10139                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10140                         if (num_out == 0) {
10141                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10142                         }
10143                 }
10144                 if (nagle_on) {
10145                         /*
10146                          * When the Nagle algorithm is used, look at how
10147                          * much is unsent, then if its smaller than an MTU
10148                          * and we have data in flight we stop, except if we
10149                          * are handling a fragmented user message.
10150                          */
10151                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10152                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10153                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10154                             (stcb->asoc.total_flight > 0) &&
10155                             ((stcb->asoc.locked_on_sending == NULL) ||
10156                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10157                                 break;
10158                         }
10159                 }
10160                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10161                     TAILQ_EMPTY(&asoc->send_queue) &&
10162                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10163                         /* Nothing left to send */
10164                         break;
10165                 }
10166                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10167                         /* Nothing left to send */
10168                         break;
10169                 }
10170         } while (num_out &&
10171             ((asoc->max_burst == 0) ||
10172             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10173             (burst_cnt < asoc->max_burst)));
10174
10175         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10176                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10177                         SCTP_STAT_INCR(sctps_maxburstqueued);
10178                         asoc->burst_limit_applied = 1;
10179                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10180                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10181                         }
10182                 } else {
10183                         asoc->burst_limit_applied = 0;
10184                 }
10185         }
10186         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10187                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10188         }
10189         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10190             tot_out);
10191
10192         /*-
10193          * Now we need to clean up the control chunk chain if a ECNE is on
10194          * it. It must be marked as UNSENT again so next call will continue
10195          * to send it until such time that we get a CWR, to remove it.
10196          */
10197         if (stcb->asoc.ecn_echo_cnt_onq)
10198                 sctp_fix_ecn_echo(asoc);
10199
10200         if (stcb->asoc.trigger_reset) {
10201                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10202                         goto do_it_again;
10203                 }
10204         }
10205         return;
10206 }
10207
10208
10209 int
10210 sctp_output(
10211     struct sctp_inpcb *inp,
10212     struct mbuf *m,
10213     struct sockaddr *addr,
10214     struct mbuf *control,
10215     struct thread *p,
10216     int flags)
10217 {
10218         if (inp == NULL) {
10219                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10220                 return (EINVAL);
10221         }
10222         if (inp->sctp_socket == NULL) {
10223                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10224                 return (EINVAL);
10225         }
10226         return (sctp_sosend(inp->sctp_socket,
10227             addr,
10228             (struct uio *)NULL,
10229             m,
10230             control,
10231             flags, p
10232             ));
10233 }
10234
10235 void
10236 send_forward_tsn(struct sctp_tcb *stcb,
10237     struct sctp_association *asoc)
10238 {
10239         struct sctp_tmit_chunk *chk;
10240         struct sctp_forward_tsn_chunk *fwdtsn;
10241         uint32_t advance_peer_ack_point;
10242
10243         SCTP_TCB_LOCK_ASSERT(stcb);
10244         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10245                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10246                         /* mark it to unsent */
10247                         chk->sent = SCTP_DATAGRAM_UNSENT;
10248                         chk->snd_count = 0;
10249                         /* Do we correct its output location? */
10250                         if (chk->whoTo) {
10251                                 sctp_free_remote_addr(chk->whoTo);
10252                                 chk->whoTo = NULL;
10253                         }
10254                         goto sctp_fill_in_rest;
10255                 }
10256         }
10257         /* Ok if we reach here we must build one */
10258         sctp_alloc_a_chunk(stcb, chk);
10259         if (chk == NULL) {
10260                 return;
10261         }
10262         asoc->fwd_tsn_cnt++;
10263         chk->copy_by_ref = 0;
10264         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10265         chk->rec.chunk_id.can_take_data = 0;
10266         chk->flags = 0;
10267         chk->asoc = asoc;
10268         chk->whoTo = NULL;
10269         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10270         if (chk->data == NULL) {
10271                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10272                 return;
10273         }
10274         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10275         chk->sent = SCTP_DATAGRAM_UNSENT;
10276         chk->snd_count = 0;
10277         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10278         asoc->ctrl_queue_cnt++;
10279 sctp_fill_in_rest:
10280         /*-
10281          * Here we go through and fill out the part that deals with
10282          * stream/seq of the ones we skip.
10283          */
10284         SCTP_BUF_LEN(chk->data) = 0;
10285         {
10286                 struct sctp_tmit_chunk *at, *tp1, *last;
10287                 struct sctp_strseq *strseq;
10288                 unsigned int cnt_of_space, i, ovh;
10289                 unsigned int space_needed;
10290                 unsigned int cnt_of_skipped = 0;
10291
10292                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10293                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10294                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10295                                 /* no more to look at */
10296                                 break;
10297                         }
10298                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10299                                 /* We don't report these */
10300                                 continue;
10301                         }
10302                         cnt_of_skipped++;
10303                 }
10304                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10305                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10306
10307                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10308
10309                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10310                         ovh = SCTP_MIN_OVERHEAD;
10311                 } else {
10312                         ovh = SCTP_MIN_V4_OVERHEAD;
10313                 }
10314                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10315                         /* trim to a mtu size */
10316                         cnt_of_space = asoc->smallest_mtu - ovh;
10317                 }
10318                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10319                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10320                             0xff, 0, cnt_of_skipped,
10321                             asoc->advanced_peer_ack_point);
10322
10323                 }
10324                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10325                 if (cnt_of_space < space_needed) {
10326                         /*-
10327                          * ok we must trim down the chunk by lowering the
10328                          * advance peer ack point.
10329                          */
10330                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10331                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10332                                     0xff, 0xff, cnt_of_space,
10333                                     space_needed);
10334                         }
10335                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10336                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10337                         /*-
10338                          * Go through and find the TSN that will be the one
10339                          * we report.
10340                          */
10341                         at = TAILQ_FIRST(&asoc->sent_queue);
10342                         if (at != NULL) {
10343                                 for (i = 0; i < cnt_of_skipped; i++) {
10344                                         tp1 = TAILQ_NEXT(at, sctp_next);
10345                                         if (tp1 == NULL) {
10346                                                 break;
10347                                         }
10348                                         at = tp1;
10349                                 }
10350                         }
10351                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10352                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10353                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10354                                     asoc->advanced_peer_ack_point);
10355                         }
10356                         last = at;
10357                         /*-
10358                          * last now points to last one I can report, update
10359                          * peer ack point
10360                          */
10361                         if (last)
10362                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10363                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10364                             cnt_of_skipped * sizeof(struct sctp_strseq);
10365                 }
10366                 chk->send_size = space_needed;
10367                 /* Setup the chunk */
10368                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10369                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10370                 fwdtsn->ch.chunk_flags = 0;
10371                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10372                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10373                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10374                 fwdtsn++;
10375                 /*-
10376                  * Move pointer to after the fwdtsn and transfer to the
10377                  * strseq pointer.
10378                  */
10379                 strseq = (struct sctp_strseq *)fwdtsn;
10380                 /*-
10381                  * Now populate the strseq list. This is done blindly
10382                  * without pulling out duplicate stream info. This is
10383                  * inefficent but won't harm the process since the peer will
10384                  * look at these in sequence and will thus release anything.
10385                  * It could mean we exceed the PMTU and chop off some that
10386                  * we could have included.. but this is unlikely (aka 1432/4
10387                  * would mean 300+ stream seq's would have to be reported in
10388                  * one FWD-TSN. With a bit of work we can later FIX this to
10389                  * optimize and pull out duplcates.. but it does add more
10390                  * overhead. So for now... not!
10391                  */
10392                 at = TAILQ_FIRST(&asoc->sent_queue);
10393                 for (i = 0; i < cnt_of_skipped; i++) {
10394                         tp1 = TAILQ_NEXT(at, sctp_next);
10395                         if (tp1 == NULL)
10396                                 break;
10397                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10398                                 /* We don't report these */
10399                                 i--;
10400                                 at = tp1;
10401                                 continue;
10402                         }
10403                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10404                                 at->rec.data.fwd_tsn_cnt = 0;
10405                         }
10406                         strseq->stream = ntohs(at->rec.data.stream_number);
10407                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10408                         strseq++;
10409                         at = tp1;
10410                 }
10411         }
10412         return;
10413 }
10414
10415 void
10416 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10417 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10418     SCTP_UNUSED
10419 #endif
10420 )
10421 {
10422         /*-
10423          * Queue up a SACK or NR-SACK in the control queue.
10424          * We must first check to see if a SACK or NR-SACK is
10425          * somehow on the control queue.
10426          * If so, we will take and and remove the old one.
10427          */
10428         struct sctp_association *asoc;
10429         struct sctp_tmit_chunk *chk, *a_chk;
10430         struct sctp_sack_chunk *sack;
10431         struct sctp_nr_sack_chunk *nr_sack;
10432         struct sctp_gap_ack_block *gap_descriptor;
10433         struct sack_track *selector;
10434         int mergeable = 0;
10435         int offset;
10436         caddr_t limit;
10437         uint32_t *dup;
10438         int limit_reached = 0;
10439         unsigned int i, siz, j;
10440         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10441         int num_dups = 0;
10442         int space_req;
10443         uint32_t highest_tsn;
10444         uint8_t flags;
10445         uint8_t type;
10446         uint8_t tsn_map;
10447
10448         if (stcb->asoc.nrsack_supported == 1) {
10449                 type = SCTP_NR_SELECTIVE_ACK;
10450         } else {
10451                 type = SCTP_SELECTIVE_ACK;
10452         }
10453         a_chk = NULL;
10454         asoc = &stcb->asoc;
10455         SCTP_TCB_LOCK_ASSERT(stcb);
10456         if (asoc->last_data_chunk_from == NULL) {
10457                 /* Hmm we never received anything */
10458                 return;
10459         }
10460         sctp_slide_mapping_arrays(stcb);
10461         sctp_set_rwnd(stcb, asoc);
10462         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10463                 if (chk->rec.chunk_id.id == type) {
10464                         /* Hmm, found a sack already on queue, remove it */
10465                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10466                         asoc->ctrl_queue_cnt--;
10467                         a_chk = chk;
10468                         if (a_chk->data) {
10469                                 sctp_m_freem(a_chk->data);
10470                                 a_chk->data = NULL;
10471                         }
10472                         if (a_chk->whoTo) {
10473                                 sctp_free_remote_addr(a_chk->whoTo);
10474                                 a_chk->whoTo = NULL;
10475                         }
10476                         break;
10477                 }
10478         }
10479         if (a_chk == NULL) {
10480                 sctp_alloc_a_chunk(stcb, a_chk);
10481                 if (a_chk == NULL) {
10482                         /* No memory so we drop the idea, and set a timer */
10483                         if (stcb->asoc.delayed_ack) {
10484                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10485                                     stcb->sctp_ep, stcb, NULL,
10486                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10487                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10488                                     stcb->sctp_ep, stcb, NULL);
10489                         } else {
10490                                 stcb->asoc.send_sack = 1;
10491                         }
10492                         return;
10493                 }
10494                 a_chk->copy_by_ref = 0;
10495                 a_chk->rec.chunk_id.id = type;
10496                 a_chk->rec.chunk_id.can_take_data = 1;
10497         }
10498         /* Clear our pkt counts */
10499         asoc->data_pkts_seen = 0;
10500
10501         a_chk->flags = 0;
10502         a_chk->asoc = asoc;
10503         a_chk->snd_count = 0;
10504         a_chk->send_size = 0;   /* fill in later */
10505         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10506         a_chk->whoTo = NULL;
10507
10508         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10509                 /*-
10510                  * Ok, the destination for the SACK is unreachable, lets see if
10511                  * we can select an alternate to asoc->last_data_chunk_from
10512                  */
10513                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10514                 if (a_chk->whoTo == NULL) {
10515                         /* Nope, no alternate */
10516                         a_chk->whoTo = asoc->last_data_chunk_from;
10517                 }
10518         } else {
10519                 a_chk->whoTo = asoc->last_data_chunk_from;
10520         }
10521         if (a_chk->whoTo) {
10522                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10523         }
10524         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10525                 highest_tsn = asoc->highest_tsn_inside_map;
10526         } else {
10527                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10528         }
10529         if (highest_tsn == asoc->cumulative_tsn) {
10530                 /* no gaps */
10531                 if (type == SCTP_SELECTIVE_ACK) {
10532                         space_req = sizeof(struct sctp_sack_chunk);
10533                 } else {
10534                         space_req = sizeof(struct sctp_nr_sack_chunk);
10535                 }
10536         } else {
10537                 /* gaps get a cluster */
10538                 space_req = MCLBYTES;
10539         }
10540         /* Ok now lets formulate a MBUF with our sack */
10541         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10542         if ((a_chk->data == NULL) ||
10543             (a_chk->whoTo == NULL)) {
10544                 /* rats, no mbuf memory */
10545                 if (a_chk->data) {
10546                         /* was a problem with the destination */
10547                         sctp_m_freem(a_chk->data);
10548                         a_chk->data = NULL;
10549                 }
10550                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10551                 /* sa_ignore NO_NULL_CHK */
10552                 if (stcb->asoc.delayed_ack) {
10553                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10554                             stcb->sctp_ep, stcb, NULL,
10555                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10556                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10557                             stcb->sctp_ep, stcb, NULL);
10558                 } else {
10559                         stcb->asoc.send_sack = 1;
10560                 }
10561                 return;
10562         }
10563         /* ok, lets go through and fill it in */
10564         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10565         space = M_TRAILINGSPACE(a_chk->data);
10566         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10567                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10568         }
10569         limit = mtod(a_chk->data, caddr_t);
10570         limit += space;
10571
10572         flags = 0;
10573
10574         if ((asoc->sctp_cmt_on_off > 0) &&
10575             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10576                 /*-
10577                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10578                  * received, then set high bit to 1, else 0. Reset
10579                  * pkts_rcvd.
10580                  */
10581                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10582                 asoc->cmt_dac_pkts_rcvd = 0;
10583         }
10584 #ifdef SCTP_ASOCLOG_OF_TSNS
10585         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10586         stcb->asoc.cumack_log_atsnt++;
10587         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10588                 stcb->asoc.cumack_log_atsnt = 0;
10589         }
10590 #endif
10591         /* reset the readers interpretation */
10592         stcb->freed_by_sorcv_sincelast = 0;
10593
10594         if (type == SCTP_SELECTIVE_ACK) {
10595                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10596                 nr_sack = NULL;
10597                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10598                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10599                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10600                 } else {
10601                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10602                 }
10603         } else {
10604                 sack = NULL;
10605                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10606                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10607                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10608                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10609                 } else {
10610                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10611                 }
10612         }
10613
10614         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10615                 offset = 1;
10616         } else {
10617                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10618         }
10619         if (((type == SCTP_SELECTIVE_ACK) &&
10620             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10621             ((type == SCTP_NR_SELECTIVE_ACK) &&
10622             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10623                 /* we have a gap .. maybe */
10624                 for (i = 0; i < siz; i++) {
10625                         tsn_map = asoc->mapping_array[i];
10626                         if (type == SCTP_SELECTIVE_ACK) {
10627                                 tsn_map |= asoc->nr_mapping_array[i];
10628                         }
10629                         if (i == 0) {
10630                                 /*
10631                                  * Clear all bits corresponding to TSNs
10632                                  * smaller or equal to the cumulative TSN.
10633                                  */
10634                                 tsn_map &= (~0U << (1 - offset));
10635                         }
10636                         selector = &sack_array[tsn_map];
10637                         if (mergeable && selector->right_edge) {
10638                                 /*
10639                                  * Backup, left and right edges were ok to
10640                                  * merge.
10641                                  */
10642                                 num_gap_blocks--;
10643                                 gap_descriptor--;
10644                         }
10645                         if (selector->num_entries == 0)
10646                                 mergeable = 0;
10647                         else {
10648                                 for (j = 0; j < selector->num_entries; j++) {
10649                                         if (mergeable && selector->right_edge) {
10650                                                 /*
10651                                                  * do a merge by NOT setting
10652                                                  * the left side
10653                                                  */
10654                                                 mergeable = 0;
10655                                         } else {
10656                                                 /*
10657                                                  * no merge, set the left
10658                                                  * side
10659                                                  */
10660                                                 mergeable = 0;
10661                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10662                                         }
10663                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10664                                         num_gap_blocks++;
10665                                         gap_descriptor++;
10666                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10667                                                 /* no more room */
10668                                                 limit_reached = 1;
10669                                                 break;
10670                                         }
10671                                 }
10672                                 if (selector->left_edge) {
10673                                         mergeable = 1;
10674                                 }
10675                         }
10676                         if (limit_reached) {
10677                                 /* Reached the limit stop */
10678                                 break;
10679                         }
10680                         offset += 8;
10681                 }
10682         }
10683         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10684             (limit_reached == 0)) {
10685
10686                 mergeable = 0;
10687
10688                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10689                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10690                 } else {
10691                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10692                 }
10693
10694                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10695                         offset = 1;
10696                 } else {
10697                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10698                 }
10699                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10700                         /* we have a gap .. maybe */
10701                         for (i = 0; i < siz; i++) {
10702                                 tsn_map = asoc->nr_mapping_array[i];
10703                                 if (i == 0) {
10704                                         /*
10705                                          * Clear all bits corresponding to
10706                                          * TSNs smaller or equal to the
10707                                          * cumulative TSN.
10708                                          */
10709                                         tsn_map &= (~0U << (1 - offset));
10710                                 }
10711                                 selector = &sack_array[tsn_map];
10712                                 if (mergeable && selector->right_edge) {
10713                                         /*
10714                                          * Backup, left and right edges were
10715                                          * ok to merge.
10716                                          */
10717                                         num_nr_gap_blocks--;
10718                                         gap_descriptor--;
10719                                 }
10720                                 if (selector->num_entries == 0)
10721                                         mergeable = 0;
10722                                 else {
10723                                         for (j = 0; j < selector->num_entries; j++) {
10724                                                 if (mergeable && selector->right_edge) {
10725                                                         /*
10726                                                          * do a merge by NOT
10727                                                          * setting the left
10728                                                          * side
10729                                                          */
10730                                                         mergeable = 0;
10731                                                 } else {
10732                                                         /*
10733                                                          * no merge, set the
10734                                                          * left side
10735                                                          */
10736                                                         mergeable = 0;
10737                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10738                                                 }
10739                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10740                                                 num_nr_gap_blocks++;
10741                                                 gap_descriptor++;
10742                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10743                                                         /* no more room */
10744                                                         limit_reached = 1;
10745                                                         break;
10746                                                 }
10747                                         }
10748                                         if (selector->left_edge) {
10749                                                 mergeable = 1;
10750                                         }
10751                                 }
10752                                 if (limit_reached) {
10753                                         /* Reached the limit stop */
10754                                         break;
10755                                 }
10756                                 offset += 8;
10757                         }
10758                 }
10759         }
10760         /* now we must add any dups we are going to report. */
10761         if ((limit_reached == 0) && (asoc->numduptsns)) {
10762                 dup = (uint32_t *) gap_descriptor;
10763                 for (i = 0; i < asoc->numduptsns; i++) {
10764                         *dup = htonl(asoc->dup_tsns[i]);
10765                         dup++;
10766                         num_dups++;
10767                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10768                                 /* no more room */
10769                                 break;
10770                         }
10771                 }
10772                 asoc->numduptsns = 0;
10773         }
10774         /*
10775          * now that the chunk is prepared queue it to the control chunk
10776          * queue.
10777          */
10778         if (type == SCTP_SELECTIVE_ACK) {
10779                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10780                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10781                     num_dups * sizeof(int32_t);
10782                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10783                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10784                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10785                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10786                 sack->sack.num_dup_tsns = htons(num_dups);
10787                 sack->ch.chunk_type = type;
10788                 sack->ch.chunk_flags = flags;
10789                 sack->ch.chunk_length = htons(a_chk->send_size);
10790         } else {
10791                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10792                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10793                     num_dups * sizeof(int32_t);
10794                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10795                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10796                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10797                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10798                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10799                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10800                 nr_sack->nr_sack.reserved = 0;
10801                 nr_sack->ch.chunk_type = type;
10802                 nr_sack->ch.chunk_flags = flags;
10803                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10804         }
10805         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10806         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10807         asoc->ctrl_queue_cnt++;
10808         asoc->send_sack = 0;
10809         SCTP_STAT_INCR(sctps_sendsacks);
10810         return;
10811 }
10812
10813 void
10814 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10815 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10816     SCTP_UNUSED
10817 #endif
10818 )
10819 {
10820         struct mbuf *m_abort, *m, *m_last;
10821         struct mbuf *m_out, *m_end = NULL;
10822         struct sctp_abort_chunk *abort;
10823         struct sctp_auth_chunk *auth = NULL;
10824         struct sctp_nets *net;
10825         uint32_t vtag;
10826         uint32_t auth_offset = 0;
10827         uint16_t cause_len, chunk_len, padding_len;
10828
10829         SCTP_TCB_LOCK_ASSERT(stcb);
10830         /*-
10831          * Add an AUTH chunk, if chunk requires it and save the offset into
10832          * the chain for AUTH
10833          */
10834         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10835             stcb->asoc.peer_auth_chunks)) {
10836                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10837                     stcb, SCTP_ABORT_ASSOCIATION);
10838                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10839         } else {
10840                 m_out = NULL;
10841         }
10842         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10843         if (m_abort == NULL) {
10844                 if (m_out) {
10845                         sctp_m_freem(m_out);
10846                 }
10847                 if (operr) {
10848                         sctp_m_freem(operr);
10849                 }
10850                 return;
10851         }
10852         /* link in any error */
10853         SCTP_BUF_NEXT(m_abort) = operr;
10854         cause_len = 0;
10855         m_last = NULL;
10856         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10857                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10858                 if (SCTP_BUF_NEXT(m) == NULL) {
10859                         m_last = m;
10860                 }
10861         }
10862         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10863         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10864         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10865         if (m_out == NULL) {
10866                 /* NO Auth chunk prepended, so reserve space in front */
10867                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10868                 m_out = m_abort;
10869         } else {
10870                 /* Put AUTH chunk at the front of the chain */
10871                 SCTP_BUF_NEXT(m_end) = m_abort;
10872         }
10873         if (stcb->asoc.alternate) {
10874                 net = stcb->asoc.alternate;
10875         } else {
10876                 net = stcb->asoc.primary_destination;
10877         }
10878         /* Fill in the ABORT chunk header. */
10879         abort = mtod(m_abort, struct sctp_abort_chunk *);
10880         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10881         if (stcb->asoc.peer_vtag == 0) {
10882                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10883                 vtag = stcb->asoc.my_vtag;
10884                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10885         } else {
10886                 vtag = stcb->asoc.peer_vtag;
10887                 abort->ch.chunk_flags = 0;
10888         }
10889         abort->ch.chunk_length = htons(chunk_len);
10890         /* Add padding, if necessary. */
10891         if (padding_len > 0) {
10892                 if ((m_last == NULL) ||
10893                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10894                         sctp_m_freem(m_out);
10895                         return;
10896                 }
10897         }
10898         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10899             (struct sockaddr *)&net->ro._l_addr,
10900             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10901             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10902             stcb->asoc.primary_destination->port, NULL,
10903             0, 0,
10904             so_locked);
10905         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10906 }
10907
10908 void
10909 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10910     struct sctp_nets *net,
10911     int reflect_vtag)
10912 {
10913         /* formulate and SEND a SHUTDOWN-COMPLETE */
10914         struct mbuf *m_shutdown_comp;
10915         struct sctp_shutdown_complete_chunk *shutdown_complete;
10916         uint32_t vtag;
10917         uint8_t flags;
10918
10919         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10920         if (m_shutdown_comp == NULL) {
10921                 /* no mbuf's */
10922                 return;
10923         }
10924         if (reflect_vtag) {
10925                 flags = SCTP_HAD_NO_TCB;
10926                 vtag = stcb->asoc.my_vtag;
10927         } else {
10928                 flags = 0;
10929                 vtag = stcb->asoc.peer_vtag;
10930         }
10931         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10932         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10933         shutdown_complete->ch.chunk_flags = flags;
10934         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10935         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10936         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10937             (struct sockaddr *)&net->ro._l_addr,
10938             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10939             stcb->sctp_ep->sctp_lport, stcb->rport,
10940             htonl(vtag),
10941             net->port, NULL,
10942             0, 0,
10943             SCTP_SO_NOT_LOCKED);
10944         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10945         return;
10946 }
10947
10948 static void
10949 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10950     struct sctphdr *sh, uint32_t vtag,
10951     uint8_t type, struct mbuf *cause,
10952     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10953     uint32_t vrf_id, uint16_t port)
10954 {
10955         struct mbuf *o_pak;
10956         struct mbuf *mout;
10957         struct sctphdr *shout;
10958         struct sctp_chunkhdr *ch;
10959
10960 #if defined(INET) || defined(INET6)
10961         struct udphdr *udp;
10962         int ret;
10963
10964 #endif
10965         int len, cause_len, padding_len;
10966
10967 #ifdef INET
10968         struct sockaddr_in *src_sin, *dst_sin;
10969         struct ip *ip;
10970
10971 #endif
10972 #ifdef INET6
10973         struct sockaddr_in6 *src_sin6, *dst_sin6;
10974         struct ip6_hdr *ip6;
10975
10976 #endif
10977
10978         /* Compute the length of the cause and add final padding. */
10979         cause_len = 0;
10980         if (cause != NULL) {
10981                 struct mbuf *m_at, *m_last = NULL;
10982
10983                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10984                         if (SCTP_BUF_NEXT(m_at) == NULL)
10985                                 m_last = m_at;
10986                         cause_len += SCTP_BUF_LEN(m_at);
10987                 }
10988                 padding_len = cause_len % 4;
10989                 if (padding_len != 0) {
10990                         padding_len = 4 - padding_len;
10991                 }
10992                 if (padding_len != 0) {
10993                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10994                                 sctp_m_freem(cause);
10995                                 return;
10996                         }
10997                 }
10998         } else {
10999                 padding_len = 0;
11000         }
11001         /* Get an mbuf for the header. */
11002         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11003         switch (dst->sa_family) {
11004 #ifdef INET
11005         case AF_INET:
11006                 len += sizeof(struct ip);
11007                 break;
11008 #endif
11009 #ifdef INET6
11010         case AF_INET6:
11011                 len += sizeof(struct ip6_hdr);
11012                 break;
11013 #endif
11014         default:
11015                 break;
11016         }
11017 #if defined(INET) || defined(INET6)
11018         if (port) {
11019                 len += sizeof(struct udphdr);
11020         }
11021 #endif
11022         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11023         if (mout == NULL) {
11024                 if (cause) {
11025                         sctp_m_freem(cause);
11026                 }
11027                 return;
11028         }
11029         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11030         SCTP_BUF_LEN(mout) = len;
11031         SCTP_BUF_NEXT(mout) = cause;
11032         M_SETFIB(mout, fibnum);
11033         mout->m_pkthdr.flowid = mflowid;
11034         M_HASHTYPE_SET(mout, mflowtype);
11035 #ifdef INET
11036         ip = NULL;
11037 #endif
11038 #ifdef INET6
11039         ip6 = NULL;
11040 #endif
11041         switch (dst->sa_family) {
11042 #ifdef INET
11043         case AF_INET:
11044                 src_sin = (struct sockaddr_in *)src;
11045                 dst_sin = (struct sockaddr_in *)dst;
11046                 ip = mtod(mout, struct ip *);
11047                 ip->ip_v = IPVERSION;
11048                 ip->ip_hl = (sizeof(struct ip) >> 2);
11049                 ip->ip_tos = 0;
11050                 ip->ip_id = ip_newid();
11051                 ip->ip_off = 0;
11052                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11053                 if (port) {
11054                         ip->ip_p = IPPROTO_UDP;
11055                 } else {
11056                         ip->ip_p = IPPROTO_SCTP;
11057                 }
11058                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11059                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11060                 ip->ip_sum = 0;
11061                 len = sizeof(struct ip);
11062                 shout = (struct sctphdr *)((caddr_t)ip + len);
11063                 break;
11064 #endif
11065 #ifdef INET6
11066         case AF_INET6:
11067                 src_sin6 = (struct sockaddr_in6 *)src;
11068                 dst_sin6 = (struct sockaddr_in6 *)dst;
11069                 ip6 = mtod(mout, struct ip6_hdr *);
11070                 ip6->ip6_flow = htonl(0x60000000);
11071                 if (V_ip6_auto_flowlabel) {
11072                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11073                 }
11074                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11075                 if (port) {
11076                         ip6->ip6_nxt = IPPROTO_UDP;
11077                 } else {
11078                         ip6->ip6_nxt = IPPROTO_SCTP;
11079                 }
11080                 ip6->ip6_src = dst_sin6->sin6_addr;
11081                 ip6->ip6_dst = src_sin6->sin6_addr;
11082                 len = sizeof(struct ip6_hdr);
11083                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11084                 break;
11085 #endif
11086         default:
11087                 len = 0;
11088                 shout = mtod(mout, struct sctphdr *);
11089                 break;
11090         }
11091 #if defined(INET) || defined(INET6)
11092         if (port) {
11093                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11094                         sctp_m_freem(mout);
11095                         return;
11096                 }
11097                 udp = (struct udphdr *)shout;
11098                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11099                 udp->uh_dport = port;
11100                 udp->uh_sum = 0;
11101                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11102                     sizeof(struct sctphdr) +
11103                     sizeof(struct sctp_chunkhdr) +
11104                     cause_len + padding_len);
11105                 len += sizeof(struct udphdr);
11106                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11107         } else {
11108                 udp = NULL;
11109         }
11110 #endif
11111         shout->src_port = sh->dest_port;
11112         shout->dest_port = sh->src_port;
11113         shout->checksum = 0;
11114         if (vtag) {
11115                 shout->v_tag = htonl(vtag);
11116         } else {
11117                 shout->v_tag = sh->v_tag;
11118         }
11119         len += sizeof(struct sctphdr);
11120         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11121         ch->chunk_type = type;
11122         if (vtag) {
11123                 ch->chunk_flags = 0;
11124         } else {
11125                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11126         }
11127         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11128         len += sizeof(struct sctp_chunkhdr);
11129         len += cause_len + padding_len;
11130
11131         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11132                 sctp_m_freem(mout);
11133                 return;
11134         }
11135         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11136         switch (dst->sa_family) {
11137 #ifdef INET
11138         case AF_INET:
11139                 if (port) {
11140                         if (V_udp_cksum) {
11141                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11142                         } else {
11143                                 udp->uh_sum = 0;
11144                         }
11145                 }
11146                 ip->ip_len = htons(len);
11147                 if (port) {
11148 #if defined(SCTP_WITH_NO_CSUM)
11149                         SCTP_STAT_INCR(sctps_sendnocrc);
11150 #else
11151                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11152                         SCTP_STAT_INCR(sctps_sendswcrc);
11153 #endif
11154                         if (V_udp_cksum) {
11155                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11156                         }
11157                 } else {
11158 #if defined(SCTP_WITH_NO_CSUM)
11159                         SCTP_STAT_INCR(sctps_sendnocrc);
11160 #else
11161                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11162                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11163                         SCTP_STAT_INCR(sctps_sendhwcrc);
11164 #endif
11165                 }
11166 #ifdef SCTP_PACKET_LOGGING
11167                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11168                         sctp_packet_log(o_pak);
11169                 }
11170 #endif
11171                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11172                 break;
11173 #endif
11174 #ifdef INET6
11175         case AF_INET6:
11176                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11177                 if (port) {
11178 #if defined(SCTP_WITH_NO_CSUM)
11179                         SCTP_STAT_INCR(sctps_sendnocrc);
11180 #else
11181                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11182                         SCTP_STAT_INCR(sctps_sendswcrc);
11183 #endif
11184                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11185                                 udp->uh_sum = 0xffff;
11186                         }
11187                 } else {
11188 #if defined(SCTP_WITH_NO_CSUM)
11189                         SCTP_STAT_INCR(sctps_sendnocrc);
11190 #else
11191                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11192                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11193                         SCTP_STAT_INCR(sctps_sendhwcrc);
11194 #endif
11195                 }
11196 #ifdef SCTP_PACKET_LOGGING
11197                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11198                         sctp_packet_log(o_pak);
11199                 }
11200 #endif
11201                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11202                 break;
11203 #endif
11204         default:
11205                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11206                     dst->sa_family);
11207                 sctp_m_freem(mout);
11208                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11209                 return;
11210         }
11211         SCTP_STAT_INCR(sctps_sendpackets);
11212         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11213         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11214         return;
11215 }
11216
11217 void
11218 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11219     struct sctphdr *sh,
11220     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11221     uint32_t vrf_id, uint16_t port)
11222 {
11223         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11224             mflowtype, mflowid, fibnum,
11225             vrf_id, port);
11226 }
11227
11228 void
11229 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11230 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11231     SCTP_UNUSED
11232 #endif
11233 )
11234 {
11235         struct sctp_tmit_chunk *chk;
11236         struct sctp_heartbeat_chunk *hb;
11237         struct timeval now;
11238
11239         SCTP_TCB_LOCK_ASSERT(stcb);
11240         if (net == NULL) {
11241                 return;
11242         }
11243         (void)SCTP_GETTIME_TIMEVAL(&now);
11244         switch (net->ro._l_addr.sa.sa_family) {
11245 #ifdef INET
11246         case AF_INET:
11247                 break;
11248 #endif
11249 #ifdef INET6
11250         case AF_INET6:
11251                 break;
11252 #endif
11253         default:
11254                 return;
11255         }
11256         sctp_alloc_a_chunk(stcb, chk);
11257         if (chk == NULL) {
11258                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11259                 return;
11260         }
11261         chk->copy_by_ref = 0;
11262         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11263         chk->rec.chunk_id.can_take_data = 1;
11264         chk->flags = 0;
11265         chk->asoc = &stcb->asoc;
11266         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11267
11268         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11269         if (chk->data == NULL) {
11270                 sctp_free_a_chunk(stcb, chk, so_locked);
11271                 return;
11272         }
11273         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11274         SCTP_BUF_LEN(chk->data) = chk->send_size;
11275         chk->sent = SCTP_DATAGRAM_UNSENT;
11276         chk->snd_count = 0;
11277         chk->whoTo = net;
11278         atomic_add_int(&chk->whoTo->ref_count, 1);
11279         /* Now we have a mbuf that we can fill in with the details */
11280         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11281         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11282         /* fill out chunk header */
11283         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11284         hb->ch.chunk_flags = 0;
11285         hb->ch.chunk_length = htons(chk->send_size);
11286         /* Fill out hb parameter */
11287         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11288         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11289         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11290         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11291         /* Did our user request this one, put it in */
11292         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11293         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11294         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11295                 /*
11296                  * we only take from the entropy pool if the address is not
11297                  * confirmed.
11298                  */
11299                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11300                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11301         } else {
11302                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11303                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11304         }
11305         switch (net->ro._l_addr.sa.sa_family) {
11306 #ifdef INET
11307         case AF_INET:
11308                 memcpy(hb->heartbeat.hb_info.address,
11309                     &net->ro._l_addr.sin.sin_addr,
11310                     sizeof(net->ro._l_addr.sin.sin_addr));
11311                 break;
11312 #endif
11313 #ifdef INET6
11314         case AF_INET6:
11315                 memcpy(hb->heartbeat.hb_info.address,
11316                     &net->ro._l_addr.sin6.sin6_addr,
11317                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11318                 break;
11319 #endif
11320         default:
11321                 if (chk->data) {
11322                         sctp_m_freem(chk->data);
11323                         chk->data = NULL;
11324                 }
11325                 sctp_free_a_chunk(stcb, chk, so_locked);
11326                 return;
11327                 break;
11328         }
11329         net->hb_responded = 0;
11330         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11331         stcb->asoc.ctrl_queue_cnt++;
11332         SCTP_STAT_INCR(sctps_sendheartbeat);
11333         return;
11334 }
11335
11336 void
11337 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11338     uint32_t high_tsn)
11339 {
11340         struct sctp_association *asoc;
11341         struct sctp_ecne_chunk *ecne;
11342         struct sctp_tmit_chunk *chk;
11343
11344         if (net == NULL) {
11345                 return;
11346         }
11347         asoc = &stcb->asoc;
11348         SCTP_TCB_LOCK_ASSERT(stcb);
11349         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11350                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11351                         /* found a previous ECN_ECHO update it if needed */
11352                         uint32_t cnt, ctsn;
11353
11354                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11355                         ctsn = ntohl(ecne->tsn);
11356                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11357                                 ecne->tsn = htonl(high_tsn);
11358                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11359                         }
11360                         cnt = ntohl(ecne->num_pkts_since_cwr);
11361                         cnt++;
11362                         ecne->num_pkts_since_cwr = htonl(cnt);
11363                         return;
11364                 }
11365         }
11366         /* nope could not find one to update so we must build one */
11367         sctp_alloc_a_chunk(stcb, chk);
11368         if (chk == NULL) {
11369                 return;
11370         }
11371         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11372         chk->copy_by_ref = 0;
11373         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11374         chk->rec.chunk_id.can_take_data = 0;
11375         chk->flags = 0;
11376         chk->asoc = &stcb->asoc;
11377         chk->send_size = sizeof(struct sctp_ecne_chunk);
11378         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11379         if (chk->data == NULL) {
11380                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11381                 return;
11382         }
11383         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11384         SCTP_BUF_LEN(chk->data) = chk->send_size;
11385         chk->sent = SCTP_DATAGRAM_UNSENT;
11386         chk->snd_count = 0;
11387         chk->whoTo = net;
11388         atomic_add_int(&chk->whoTo->ref_count, 1);
11389
11390         stcb->asoc.ecn_echo_cnt_onq++;
11391         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11392         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11393         ecne->ch.chunk_flags = 0;
11394         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11395         ecne->tsn = htonl(high_tsn);
11396         ecne->num_pkts_since_cwr = htonl(1);
11397         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11398         asoc->ctrl_queue_cnt++;
11399 }
11400
11401 void
11402 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11403     struct mbuf *m, int len, int iphlen, int bad_crc)
11404 {
11405         struct sctp_association *asoc;
11406         struct sctp_pktdrop_chunk *drp;
11407         struct sctp_tmit_chunk *chk;
11408         uint8_t *datap;
11409         int was_trunc = 0;
11410         int fullsz = 0;
11411         long spc;
11412         int offset;
11413         struct sctp_chunkhdr *ch, chunk_buf;
11414         unsigned int chk_length;
11415
11416         if (!stcb) {
11417                 return;
11418         }
11419         asoc = &stcb->asoc;
11420         SCTP_TCB_LOCK_ASSERT(stcb);
11421         if (asoc->pktdrop_supported == 0) {
11422                 /*-
11423                  * peer must declare support before I send one.
11424                  */
11425                 return;
11426         }
11427         if (stcb->sctp_socket == NULL) {
11428                 return;
11429         }
11430         sctp_alloc_a_chunk(stcb, chk);
11431         if (chk == NULL) {
11432                 return;
11433         }
11434         chk->copy_by_ref = 0;
11435         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11436         chk->rec.chunk_id.can_take_data = 1;
11437         chk->flags = 0;
11438         len -= iphlen;
11439         chk->send_size = len;
11440         /* Validate that we do not have an ABORT in here. */
11441         offset = iphlen + sizeof(struct sctphdr);
11442         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11443             sizeof(*ch), (uint8_t *) & chunk_buf);
11444         while (ch != NULL) {
11445                 chk_length = ntohs(ch->chunk_length);
11446                 if (chk_length < sizeof(*ch)) {
11447                         /* break to abort land */
11448                         break;
11449                 }
11450                 switch (ch->chunk_type) {
11451                 case SCTP_PACKET_DROPPED:
11452                 case SCTP_ABORT_ASSOCIATION:
11453                 case SCTP_INITIATION_ACK:
11454                         /**
11455                          * We don't respond with an PKT-DROP to an ABORT
11456                          * or PKT-DROP. We also do not respond to an
11457                          * INIT-ACK, because we can't know if the initiation
11458                          * tag is correct or not.
11459                          */
11460                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11461                         return;
11462                 default:
11463                         break;
11464                 }
11465                 offset += SCTP_SIZE32(chk_length);
11466                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11467                     sizeof(*ch), (uint8_t *) & chunk_buf);
11468         }
11469
11470         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11471             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11472                 /*
11473                  * only send 1 mtu worth, trim off the excess on the end.
11474                  */
11475                 fullsz = len;
11476                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11477                 was_trunc = 1;
11478         }
11479         chk->asoc = &stcb->asoc;
11480         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11481         if (chk->data == NULL) {
11482 jump_out:
11483                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11484                 return;
11485         }
11486         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11487         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11488         if (drp == NULL) {
11489                 sctp_m_freem(chk->data);
11490                 chk->data = NULL;
11491                 goto jump_out;
11492         }
11493         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11494             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11495         chk->book_size_scale = 0;
11496         if (was_trunc) {
11497                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11498                 drp->trunc_len = htons(fullsz);
11499                 /*
11500                  * Len is already adjusted to size minus overhead above take
11501                  * out the pkt_drop chunk itself from it.
11502                  */
11503                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11504                 len = chk->send_size;
11505         } else {
11506                 /* no truncation needed */
11507                 drp->ch.chunk_flags = 0;
11508                 drp->trunc_len = htons(0);
11509         }
11510         if (bad_crc) {
11511                 drp->ch.chunk_flags |= SCTP_BADCRC;
11512         }
11513         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11514         SCTP_BUF_LEN(chk->data) = chk->send_size;
11515         chk->sent = SCTP_DATAGRAM_UNSENT;
11516         chk->snd_count = 0;
11517         if (net) {
11518                 /* we should hit here */
11519                 chk->whoTo = net;
11520                 atomic_add_int(&chk->whoTo->ref_count, 1);
11521         } else {
11522                 chk->whoTo = NULL;
11523         }
11524         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11525         drp->ch.chunk_length = htons(chk->send_size);
11526         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11527         if (spc < 0) {
11528                 spc = 0;
11529         }
11530         drp->bottle_bw = htonl(spc);
11531         if (asoc->my_rwnd) {
11532                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11533                     asoc->size_on_all_streams +
11534                     asoc->my_rwnd_control_len +
11535                     stcb->sctp_socket->so_rcv.sb_cc);
11536         } else {
11537                 /*-
11538                  * If my rwnd is 0, possibly from mbuf depletion as well as
11539                  * space used, tell the peer there is NO space aka onq == bw
11540                  */
11541                 drp->current_onq = htonl(spc);
11542         }
11543         drp->reserved = 0;
11544         datap = drp->data;
11545         m_copydata(m, iphlen, len, (caddr_t)datap);
11546         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11547         asoc->ctrl_queue_cnt++;
11548 }
11549
11550 void
11551 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11552 {
11553         struct sctp_association *asoc;
11554         struct sctp_cwr_chunk *cwr;
11555         struct sctp_tmit_chunk *chk;
11556
11557         SCTP_TCB_LOCK_ASSERT(stcb);
11558         if (net == NULL) {
11559                 return;
11560         }
11561         asoc = &stcb->asoc;
11562         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11563                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11564                         /*
11565                          * found a previous CWR queued to same destination
11566                          * update it if needed
11567                          */
11568                         uint32_t ctsn;
11569
11570                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11571                         ctsn = ntohl(cwr->tsn);
11572                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11573                                 cwr->tsn = htonl(high_tsn);
11574                         }
11575                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11576                                 /* Make sure override is carried */
11577                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11578                         }
11579                         return;
11580                 }
11581         }
11582         sctp_alloc_a_chunk(stcb, chk);
11583         if (chk == NULL) {
11584                 return;
11585         }
11586         chk->copy_by_ref = 0;
11587         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11588         chk->rec.chunk_id.can_take_data = 1;
11589         chk->flags = 0;
11590         chk->asoc = &stcb->asoc;
11591         chk->send_size = sizeof(struct sctp_cwr_chunk);
11592         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11593         if (chk->data == NULL) {
11594                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11595                 return;
11596         }
11597         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11598         SCTP_BUF_LEN(chk->data) = chk->send_size;
11599         chk->sent = SCTP_DATAGRAM_UNSENT;
11600         chk->snd_count = 0;
11601         chk->whoTo = net;
11602         atomic_add_int(&chk->whoTo->ref_count, 1);
11603         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11604         cwr->ch.chunk_type = SCTP_ECN_CWR;
11605         cwr->ch.chunk_flags = override;
11606         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11607         cwr->tsn = htonl(high_tsn);
11608         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11609         asoc->ctrl_queue_cnt++;
11610 }
11611
11612 static int
11613 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11614     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11615 {
11616         uint16_t len, old_len, i;
11617         struct sctp_stream_reset_out_request *req_out;
11618         struct sctp_chunkhdr *ch;
11619         int at;
11620         int number_entries = 0;
11621
11622         ch = mtod(chk->data, struct sctp_chunkhdr *);
11623         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11624         /* get to new offset for the param. */
11625         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11626         /* now how long will this param be? */
11627         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11628                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11629                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11630                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11631                         number_entries++;
11632                 }
11633         }
11634         if (number_entries == 0) {
11635                 return (0);
11636         }
11637         if (number_entries == stcb->asoc.streamoutcnt) {
11638                 number_entries = 0;
11639         }
11640         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11641                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11642         }
11643         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11644         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11645         req_out->ph.param_length = htons(len);
11646         req_out->request_seq = htonl(seq);
11647         req_out->response_seq = htonl(resp_seq);
11648         req_out->send_reset_at_tsn = htonl(last_sent);
11649         at = 0;
11650         if (number_entries) {
11651                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11652                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11653                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11654                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11655                                 req_out->list_of_streams[at] = htons(i);
11656                                 at++;
11657                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11658                                 if (at >= number_entries) {
11659                                         break;
11660                                 }
11661                         }
11662                 }
11663         } else {
11664                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11665                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11666                 }
11667         }
11668         if (SCTP_SIZE32(len) > len) {
11669                 /*-
11670                  * Need to worry about the pad we may end up adding to the
11671                  * end. This is easy since the struct is either aligned to 4
11672                  * bytes or 2 bytes off.
11673                  */
11674                 req_out->list_of_streams[number_entries] = 0;
11675         }
11676         /* now fix the chunk length */
11677         ch->chunk_length = htons(len + old_len);
11678         chk->book_size = len + old_len;
11679         chk->book_size_scale = 0;
11680         chk->send_size = SCTP_SIZE32(chk->book_size);
11681         SCTP_BUF_LEN(chk->data) = chk->send_size;
11682         return (1);
11683 }
11684
11685 static void
11686 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11687     int number_entries, uint16_t * list,
11688     uint32_t seq)
11689 {
11690         uint16_t len, old_len, i;
11691         struct sctp_stream_reset_in_request *req_in;
11692         struct sctp_chunkhdr *ch;
11693
11694         ch = mtod(chk->data, struct sctp_chunkhdr *);
11695         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11696
11697         /* get to new offset for the param. */
11698         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11699         /* now how long will this param be? */
11700         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11701         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11702         req_in->ph.param_length = htons(len);
11703         req_in->request_seq = htonl(seq);
11704         if (number_entries) {
11705                 for (i = 0; i < number_entries; i++) {
11706                         req_in->list_of_streams[i] = htons(list[i]);
11707                 }
11708         }
11709         if (SCTP_SIZE32(len) > len) {
11710                 /*-
11711                  * Need to worry about the pad we may end up adding to the
11712                  * end. This is easy since the struct is either aligned to 4
11713                  * bytes or 2 bytes off.
11714                  */
11715                 req_in->list_of_streams[number_entries] = 0;
11716         }
11717         /* now fix the chunk length */
11718         ch->chunk_length = htons(len + old_len);
11719         chk->book_size = len + old_len;
11720         chk->book_size_scale = 0;
11721         chk->send_size = SCTP_SIZE32(chk->book_size);
11722         SCTP_BUF_LEN(chk->data) = chk->send_size;
11723         return;
11724 }
11725
11726 static void
11727 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11728     uint32_t seq)
11729 {
11730         uint16_t len, old_len;
11731         struct sctp_stream_reset_tsn_request *req_tsn;
11732         struct sctp_chunkhdr *ch;
11733
11734         ch = mtod(chk->data, struct sctp_chunkhdr *);
11735         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11736
11737         /* get to new offset for the param. */
11738         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11739         /* now how long will this param be? */
11740         len = sizeof(struct sctp_stream_reset_tsn_request);
11741         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11742         req_tsn->ph.param_length = htons(len);
11743         req_tsn->request_seq = htonl(seq);
11744
11745         /* now fix the chunk length */
11746         ch->chunk_length = htons(len + old_len);
11747         chk->send_size = len + old_len;
11748         chk->book_size = SCTP_SIZE32(chk->send_size);
11749         chk->book_size_scale = 0;
11750         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11751         return;
11752 }
11753
11754 void
11755 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11756     uint32_t resp_seq, uint32_t result)
11757 {
11758         uint16_t len, old_len;
11759         struct sctp_stream_reset_response *resp;
11760         struct sctp_chunkhdr *ch;
11761
11762         ch = mtod(chk->data, struct sctp_chunkhdr *);
11763         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11764
11765         /* get to new offset for the param. */
11766         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11767         /* now how long will this param be? */
11768         len = sizeof(struct sctp_stream_reset_response);
11769         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11770         resp->ph.param_length = htons(len);
11771         resp->response_seq = htonl(resp_seq);
11772         resp->result = ntohl(result);
11773
11774         /* now fix the chunk length */
11775         ch->chunk_length = htons(len + old_len);
11776         chk->book_size = len + old_len;
11777         chk->book_size_scale = 0;
11778         chk->send_size = SCTP_SIZE32(chk->book_size);
11779         SCTP_BUF_LEN(chk->data) = chk->send_size;
11780         return;
11781 }
11782
11783 void
11784 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11785     struct sctp_stream_reset_list *ent,
11786     int response)
11787 {
11788         struct sctp_association *asoc;
11789         struct sctp_tmit_chunk *chk;
11790         struct sctp_chunkhdr *ch;
11791
11792         asoc = &stcb->asoc;
11793
11794         /*
11795          * Reset our last reset action to the new one IP -> response
11796          * (PERFORMED probably). This assures that if we fail to send, a
11797          * retran from the peer will get the new response.
11798          */
11799         asoc->last_reset_action[0] = response;
11800         if (asoc->stream_reset_outstanding) {
11801                 return;
11802         }
11803         sctp_alloc_a_chunk(stcb, chk);
11804         if (chk == NULL) {
11805                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11806                 return;
11807         }
11808         chk->copy_by_ref = 0;
11809         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11810         chk->rec.chunk_id.can_take_data = 0;
11811         chk->flags = 0;
11812         chk->asoc = &stcb->asoc;
11813         chk->book_size = sizeof(struct sctp_chunkhdr);
11814         chk->send_size = SCTP_SIZE32(chk->book_size);
11815         chk->book_size_scale = 0;
11816         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11817         if (chk->data == NULL) {
11818                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11819                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11820                 return;
11821         }
11822         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11823         sctp_add_stream_reset_result(chk, ent->seq, response);
11824         /* setup chunk parameters */
11825         chk->sent = SCTP_DATAGRAM_UNSENT;
11826         chk->snd_count = 0;
11827         if (stcb->asoc.alternate) {
11828                 chk->whoTo = stcb->asoc.alternate;
11829         } else {
11830                 chk->whoTo = stcb->asoc.primary_destination;
11831         }
11832         ch = mtod(chk->data, struct sctp_chunkhdr *);
11833         ch->chunk_type = SCTP_STREAM_RESET;
11834         ch->chunk_flags = 0;
11835         ch->chunk_length = htons(chk->book_size);
11836         atomic_add_int(&chk->whoTo->ref_count, 1);
11837         SCTP_BUF_LEN(chk->data) = chk->send_size;
11838         /* insert the chunk for sending */
11839         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11840             chk,
11841             sctp_next);
11842         asoc->ctrl_queue_cnt++;
11843 }
11844
11845 void
11846 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11847     uint32_t resp_seq, uint32_t result,
11848     uint32_t send_una, uint32_t recv_next)
11849 {
11850         uint16_t len, old_len;
11851         struct sctp_stream_reset_response_tsn *resp;
11852         struct sctp_chunkhdr *ch;
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         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11859         /* now how long will this param be? */
11860         len = sizeof(struct sctp_stream_reset_response_tsn);
11861         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11862         resp->ph.param_length = htons(len);
11863         resp->response_seq = htonl(resp_seq);
11864         resp->result = htonl(result);
11865         resp->senders_next_tsn = htonl(send_una);
11866         resp->receivers_next_tsn = htonl(recv_next);
11867
11868         /* now fix the chunk length */
11869         ch->chunk_length = htons(len + old_len);
11870         chk->book_size = len + old_len;
11871         chk->send_size = SCTP_SIZE32(chk->book_size);
11872         chk->book_size_scale = 0;
11873         SCTP_BUF_LEN(chk->data) = chk->send_size;
11874         return;
11875 }
11876
11877 static void
11878 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11879     uint32_t seq,
11880     uint16_t adding)
11881 {
11882         uint16_t len, old_len;
11883         struct sctp_chunkhdr *ch;
11884         struct sctp_stream_reset_add_strm *addstr;
11885
11886         ch = mtod(chk->data, struct sctp_chunkhdr *);
11887         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11888
11889         /* get to new offset for the param. */
11890         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11891         /* now how long will this param be? */
11892         len = sizeof(struct sctp_stream_reset_add_strm);
11893
11894         /* Fill it out. */
11895         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11896         addstr->ph.param_length = htons(len);
11897         addstr->request_seq = htonl(seq);
11898         addstr->number_of_streams = htons(adding);
11899         addstr->reserved = 0;
11900
11901         /* now fix the chunk length */
11902         ch->chunk_length = htons(len + old_len);
11903         chk->send_size = len + old_len;
11904         chk->book_size = SCTP_SIZE32(chk->send_size);
11905         chk->book_size_scale = 0;
11906         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11907         return;
11908 }
11909
11910 static void
11911 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11912     uint32_t seq,
11913     uint16_t adding)
11914 {
11915         uint16_t len, old_len;
11916         struct sctp_chunkhdr *ch;
11917         struct sctp_stream_reset_add_strm *addstr;
11918
11919         ch = mtod(chk->data, struct sctp_chunkhdr *);
11920         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11921
11922         /* get to new offset for the param. */
11923         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11924         /* now how long will this param be? */
11925         len = sizeof(struct sctp_stream_reset_add_strm);
11926         /* Fill it out. */
11927         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11928         addstr->ph.param_length = htons(len);
11929         addstr->request_seq = htonl(seq);
11930         addstr->number_of_streams = htons(adding);
11931         addstr->reserved = 0;
11932
11933         /* now fix the chunk length */
11934         ch->chunk_length = htons(len + old_len);
11935         chk->send_size = len + old_len;
11936         chk->book_size = SCTP_SIZE32(chk->send_size);
11937         chk->book_size_scale = 0;
11938         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11939         return;
11940 }
11941
11942 int
11943 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11944 {
11945         struct sctp_association *asoc;
11946         struct sctp_tmit_chunk *chk;
11947         struct sctp_chunkhdr *ch;
11948         uint32_t seq;
11949
11950         asoc = &stcb->asoc;
11951         asoc->trigger_reset = 0;
11952         if (asoc->stream_reset_outstanding) {
11953                 return (EALREADY);
11954         }
11955         sctp_alloc_a_chunk(stcb, chk);
11956         if (chk == NULL) {
11957                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11958                 return (ENOMEM);
11959         }
11960         chk->copy_by_ref = 0;
11961         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11962         chk->rec.chunk_id.can_take_data = 0;
11963         chk->flags = 0;
11964         chk->asoc = &stcb->asoc;
11965         chk->book_size = sizeof(struct sctp_chunkhdr);
11966         chk->send_size = SCTP_SIZE32(chk->book_size);
11967         chk->book_size_scale = 0;
11968         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11969         if (chk->data == NULL) {
11970                 sctp_free_a_chunk(stcb, chk, so_locked);
11971                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11972                 return (ENOMEM);
11973         }
11974         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11975
11976         /* setup chunk parameters */
11977         chk->sent = SCTP_DATAGRAM_UNSENT;
11978         chk->snd_count = 0;
11979         if (stcb->asoc.alternate) {
11980                 chk->whoTo = stcb->asoc.alternate;
11981         } else {
11982                 chk->whoTo = stcb->asoc.primary_destination;
11983         }
11984         ch = mtod(chk->data, struct sctp_chunkhdr *);
11985         ch->chunk_type = SCTP_STREAM_RESET;
11986         ch->chunk_flags = 0;
11987         ch->chunk_length = htons(chk->book_size);
11988         atomic_add_int(&chk->whoTo->ref_count, 1);
11989         SCTP_BUF_LEN(chk->data) = chk->send_size;
11990         seq = stcb->asoc.str_reset_seq_out;
11991         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11992                 seq++;
11993                 asoc->stream_reset_outstanding++;
11994         } else {
11995                 m_freem(chk->data);
11996                 chk->data = NULL;
11997                 sctp_free_a_chunk(stcb, chk, so_locked);
11998                 return (ENOENT);
11999         }
12000         asoc->str_reset = chk;
12001         /* insert the chunk for sending */
12002         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12003             chk,
12004             sctp_next);
12005         asoc->ctrl_queue_cnt++;
12006
12007         if (stcb->asoc.send_sack) {
12008                 sctp_send_sack(stcb, so_locked);
12009         }
12010         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12011         return (0);
12012 }
12013
12014 int
12015 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12016     uint16_t number_entries, uint16_t * list,
12017     uint8_t send_in_req,
12018     uint8_t send_tsn_req,
12019     uint8_t add_stream,
12020     uint16_t adding_o,
12021     uint16_t adding_i, uint8_t peer_asked)
12022 {
12023         struct sctp_association *asoc;
12024         struct sctp_tmit_chunk *chk;
12025         struct sctp_chunkhdr *ch;
12026         int can_send_out_req = 0;
12027         uint32_t seq;
12028
12029         asoc = &stcb->asoc;
12030         if (asoc->stream_reset_outstanding) {
12031                 /*-
12032                  * Already one pending, must get ACK back to clear the flag.
12033                  */
12034                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12035                 return (EBUSY);
12036         }
12037         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12038             (add_stream == 0)) {
12039                 /* nothing to do */
12040                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12041                 return (EINVAL);
12042         }
12043         if (send_tsn_req && send_in_req) {
12044                 /* error, can't do that */
12045                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12046                 return (EINVAL);
12047         } else if (send_in_req) {
12048                 can_send_out_req = 1;
12049         }
12050         if (number_entries > (MCLBYTES -
12051             SCTP_MIN_OVERHEAD -
12052             sizeof(struct sctp_chunkhdr) -
12053             sizeof(struct sctp_stream_reset_out_request)) /
12054             sizeof(uint16_t)) {
12055                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12056                 return (ENOMEM);
12057         }
12058         sctp_alloc_a_chunk(stcb, chk);
12059         if (chk == NULL) {
12060                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12061                 return (ENOMEM);
12062         }
12063         chk->copy_by_ref = 0;
12064         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12065         chk->rec.chunk_id.can_take_data = 0;
12066         chk->flags = 0;
12067         chk->asoc = &stcb->asoc;
12068         chk->book_size = sizeof(struct sctp_chunkhdr);
12069         chk->send_size = SCTP_SIZE32(chk->book_size);
12070         chk->book_size_scale = 0;
12071
12072         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12073         if (chk->data == NULL) {
12074                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12075                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12076                 return (ENOMEM);
12077         }
12078         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12079
12080         /* setup chunk parameters */
12081         chk->sent = SCTP_DATAGRAM_UNSENT;
12082         chk->snd_count = 0;
12083         if (stcb->asoc.alternate) {
12084                 chk->whoTo = stcb->asoc.alternate;
12085         } else {
12086                 chk->whoTo = stcb->asoc.primary_destination;
12087         }
12088         atomic_add_int(&chk->whoTo->ref_count, 1);
12089         ch = mtod(chk->data, struct sctp_chunkhdr *);
12090         ch->chunk_type = SCTP_STREAM_RESET;
12091         ch->chunk_flags = 0;
12092         ch->chunk_length = htons(chk->book_size);
12093         SCTP_BUF_LEN(chk->data) = chk->send_size;
12094
12095         seq = stcb->asoc.str_reset_seq_out;
12096         if (can_send_out_req) {
12097                 int ret;
12098
12099                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12100                 if (ret) {
12101                         seq++;
12102                         asoc->stream_reset_outstanding++;
12103                 }
12104         }
12105         if ((add_stream & 1) &&
12106             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12107                 /* Need to allocate more */
12108                 struct sctp_stream_out *oldstream;
12109                 struct sctp_stream_queue_pending *sp, *nsp;
12110                 int i;
12111
12112 #if defined(SCTP_DETAILED_STR_STATS)
12113                 int j;
12114
12115 #endif
12116
12117                 oldstream = stcb->asoc.strmout;
12118                 /* get some more */
12119                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12120                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12121                     SCTP_M_STRMO);
12122                 if (stcb->asoc.strmout == NULL) {
12123                         uint8_t x;
12124
12125                         stcb->asoc.strmout = oldstream;
12126                         /* Turn off the bit */
12127                         x = add_stream & 0xfe;
12128                         add_stream = x;
12129                         goto skip_stuff;
12130                 }
12131                 /*
12132                  * Ok now we proceed with copying the old out stuff and
12133                  * initializing the new stuff.
12134                  */
12135                 SCTP_TCB_SEND_LOCK(stcb);
12136                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12137                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12138                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12139                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12140                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
12141                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12142                         stcb->asoc.strmout[i].stream_no = i;
12143                         stcb->asoc.strmout[i].state = oldstream[i].state;
12144                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
12145                         /* now anything on those queues? */
12146                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12147                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12148                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12149                         }
12150                         /* Now move assoc pointers too */
12151                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
12152                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
12153                         }
12154                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
12155                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
12156                         }
12157                 }
12158                 /* now the new streams */
12159                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12160                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12161                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12162                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12163 #if defined(SCTP_DETAILED_STR_STATS)
12164                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12165                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12166                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12167                         }
12168 #else
12169                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12170                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12171 #endif
12172                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
12173                         stcb->asoc.strmout[i].stream_no = i;
12174                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12175                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12176                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12177                 }
12178                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12179                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12180                 SCTP_TCB_SEND_UNLOCK(stcb);
12181         }
12182 skip_stuff:
12183         if ((add_stream & 1) && (adding_o > 0)) {
12184                 asoc->strm_pending_add_size = adding_o;
12185                 asoc->peer_req_out = peer_asked;
12186                 sctp_add_an_out_stream(chk, seq, adding_o);
12187                 seq++;
12188                 asoc->stream_reset_outstanding++;
12189         }
12190         if ((add_stream & 2) && (adding_i > 0)) {
12191                 sctp_add_an_in_stream(chk, seq, adding_i);
12192                 seq++;
12193                 asoc->stream_reset_outstanding++;
12194         }
12195         if (send_in_req) {
12196                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12197                 seq++;
12198                 asoc->stream_reset_outstanding++;
12199         }
12200         if (send_tsn_req) {
12201                 sctp_add_stream_reset_tsn(chk, seq);
12202                 asoc->stream_reset_outstanding++;
12203         }
12204         asoc->str_reset = chk;
12205         /* insert the chunk for sending */
12206         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12207             chk,
12208             sctp_next);
12209         asoc->ctrl_queue_cnt++;
12210         if (stcb->asoc.send_sack) {
12211                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12212         }
12213         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12214         return (0);
12215 }
12216
12217 void
12218 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12219     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12220     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12221     uint32_t vrf_id, uint16_t port)
12222 {
12223         /* Don't respond to an ABORT with an ABORT. */
12224         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12225                 if (cause)
12226                         sctp_m_freem(cause);
12227                 return;
12228         }
12229         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12230             mflowtype, mflowid, fibnum,
12231             vrf_id, port);
12232         return;
12233 }
12234
12235 void
12236 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12237     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12238     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12239     uint32_t vrf_id, uint16_t port)
12240 {
12241         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12242             mflowtype, mflowid, fibnum,
12243             vrf_id, port);
12244         return;
12245 }
12246
12247 static struct mbuf *
12248 sctp_copy_resume(struct uio *uio,
12249     int max_send_len,
12250     int user_marks_eor,
12251     int *error,
12252     uint32_t * sndout,
12253     struct mbuf **new_tail)
12254 {
12255         struct mbuf *m;
12256
12257         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12258             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12259         if (m == NULL) {
12260                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12261                 *error = ENOBUFS;
12262         } else {
12263                 *sndout = m_length(m, NULL);
12264                 *new_tail = m_last(m);
12265         }
12266         return (m);
12267 }
12268
12269 static int
12270 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12271     struct uio *uio,
12272     int resv_upfront)
12273 {
12274         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12275             resv_upfront, 0);
12276         if (sp->data == NULL) {
12277                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12278                 return (ENOBUFS);
12279         }
12280         sp->tail_mbuf = m_last(sp->data);
12281         return (0);
12282 }
12283
12284
12285
12286 static struct sctp_stream_queue_pending *
12287 sctp_copy_it_in(struct sctp_tcb *stcb,
12288     struct sctp_association *asoc,
12289     struct sctp_sndrcvinfo *srcv,
12290     struct uio *uio,
12291     struct sctp_nets *net,
12292     int max_send_len,
12293     int user_marks_eor,
12294     int *error)
12295 {
12296         /*-
12297          * This routine must be very careful in its work. Protocol
12298          * processing is up and running so care must be taken to spl...()
12299          * when you need to do something that may effect the stcb/asoc. The
12300          * sb is locked however. When data is copied the protocol processing
12301          * should be enabled since this is a slower operation...
12302          */
12303         struct sctp_stream_queue_pending *sp = NULL;
12304         int resv_in_first;
12305
12306         *error = 0;
12307         /* Now can we send this? */
12308         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12309             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12310             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12311             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12312                 /* got data while shutting down */
12313                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12314                 *error = ECONNRESET;
12315                 goto out_now;
12316         }
12317         sctp_alloc_a_strmoq(stcb, sp);
12318         if (sp == NULL) {
12319                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12320                 *error = ENOMEM;
12321                 goto out_now;
12322         }
12323         sp->act_flags = 0;
12324         sp->sender_all_done = 0;
12325         sp->sinfo_flags = srcv->sinfo_flags;
12326         sp->timetolive = srcv->sinfo_timetolive;
12327         sp->ppid = srcv->sinfo_ppid;
12328         sp->context = srcv->sinfo_context;
12329         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12330
12331         sp->stream = srcv->sinfo_stream;
12332         sp->length = min(uio->uio_resid, max_send_len);
12333         if ((sp->length == (uint32_t) uio->uio_resid) &&
12334             ((user_marks_eor == 0) ||
12335             (srcv->sinfo_flags & SCTP_EOF) ||
12336             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12337                 sp->msg_is_complete = 1;
12338         } else {
12339                 sp->msg_is_complete = 0;
12340         }
12341         sp->sender_all_done = 0;
12342         sp->some_taken = 0;
12343         sp->put_last_out = 0;
12344         resv_in_first = sizeof(struct sctp_data_chunk);
12345         sp->data = sp->tail_mbuf = NULL;
12346         if (sp->length == 0) {
12347                 *error = 0;
12348                 goto skip_copy;
12349         }
12350         if (srcv->sinfo_keynumber_valid) {
12351                 sp->auth_keyid = srcv->sinfo_keynumber;
12352         } else {
12353                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12354         }
12355         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12356                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12357                 sp->holds_key_ref = 1;
12358         }
12359         *error = sctp_copy_one(sp, uio, resv_in_first);
12360 skip_copy:
12361         if (*error) {
12362                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12363                 sp = NULL;
12364         } else {
12365                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12366                         sp->net = net;
12367                         atomic_add_int(&sp->net->ref_count, 1);
12368                 } else {
12369                         sp->net = NULL;
12370                 }
12371                 sctp_set_prsctp_policy(sp);
12372         }
12373 out_now:
12374         return (sp);
12375 }
12376
12377
12378 int
12379 sctp_sosend(struct socket *so,
12380     struct sockaddr *addr,
12381     struct uio *uio,
12382     struct mbuf *top,
12383     struct mbuf *control,
12384     int flags,
12385     struct thread *p
12386 )
12387 {
12388         int error, use_sndinfo = 0;
12389         struct sctp_sndrcvinfo sndrcvninfo;
12390         struct sockaddr *addr_to_use;
12391
12392 #if defined(INET) && defined(INET6)
12393         struct sockaddr_in sin;
12394
12395 #endif
12396
12397         if (control) {
12398                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12399                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12400                     sizeof(sndrcvninfo))) {
12401                         /* got one */
12402                         use_sndinfo = 1;
12403                 }
12404         }
12405         addr_to_use = addr;
12406 #if defined(INET) && defined(INET6)
12407         if ((addr) && (addr->sa_family == AF_INET6)) {
12408                 struct sockaddr_in6 *sin6;
12409
12410                 sin6 = (struct sockaddr_in6 *)addr;
12411                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12412                         in6_sin6_2_sin(&sin, sin6);
12413                         addr_to_use = (struct sockaddr *)&sin;
12414                 }
12415         }
12416 #endif
12417         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12418             control,
12419             flags,
12420             use_sndinfo ? &sndrcvninfo : NULL
12421             ,p
12422             );
12423         return (error);
12424 }
12425
12426
12427 int
12428 sctp_lower_sosend(struct socket *so,
12429     struct sockaddr *addr,
12430     struct uio *uio,
12431     struct mbuf *i_pak,
12432     struct mbuf *control,
12433     int flags,
12434     struct sctp_sndrcvinfo *srcv
12435     ,
12436     struct thread *p
12437 )
12438 {
12439         unsigned int sndlen = 0, max_len;
12440         int error, len;
12441         struct mbuf *top = NULL;
12442         int queue_only = 0, queue_only_for_init = 0;
12443         int free_cnt_applied = 0;
12444         int un_sent;
12445         int now_filled = 0;
12446         unsigned int inqueue_bytes = 0;
12447         struct sctp_block_entry be;
12448         struct sctp_inpcb *inp;
12449         struct sctp_tcb *stcb = NULL;
12450         struct timeval now;
12451         struct sctp_nets *net;
12452         struct sctp_association *asoc;
12453         struct sctp_inpcb *t_inp;
12454         int user_marks_eor;
12455         int create_lock_applied = 0;
12456         int nagle_applies = 0;
12457         int some_on_control = 0;
12458         int got_all_of_the_send = 0;
12459         int hold_tcblock = 0;
12460         int non_blocking = 0;
12461         uint32_t local_add_more, local_soresv = 0;
12462         uint16_t port;
12463         uint16_t sinfo_flags;
12464         sctp_assoc_t sinfo_assoc_id;
12465
12466         error = 0;
12467         net = NULL;
12468         stcb = NULL;
12469         asoc = NULL;
12470
12471         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12472         if (inp == NULL) {
12473                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12474                 error = EINVAL;
12475                 if (i_pak) {
12476                         SCTP_RELEASE_PKT(i_pak);
12477                 }
12478                 return (error);
12479         }
12480         if ((uio == NULL) && (i_pak == NULL)) {
12481                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12482                 return (EINVAL);
12483         }
12484         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12485         atomic_add_int(&inp->total_sends, 1);
12486         if (uio) {
12487                 if (uio->uio_resid < 0) {
12488                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12489                         return (EINVAL);
12490                 }
12491                 sndlen = uio->uio_resid;
12492         } else {
12493                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12494                 sndlen = SCTP_HEADER_LEN(i_pak);
12495         }
12496         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12497             (void *)addr,
12498             sndlen);
12499         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12500             (inp->sctp_socket->so_qlimit)) {
12501                 /* The listener can NOT send */
12502                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12503                 error = ENOTCONN;
12504                 goto out_unlocked;
12505         }
12506         /**
12507          * Pre-screen address, if one is given the sin-len
12508          * must be set correctly!
12509          */
12510         if (addr) {
12511                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12512
12513                 switch (raddr->sa.sa_family) {
12514 #ifdef INET
12515                 case AF_INET:
12516                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12517                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12518                                 error = EINVAL;
12519                                 goto out_unlocked;
12520                         }
12521                         port = raddr->sin.sin_port;
12522                         break;
12523 #endif
12524 #ifdef INET6
12525                 case AF_INET6:
12526                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12527                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12528                                 error = EINVAL;
12529                                 goto out_unlocked;
12530                         }
12531                         port = raddr->sin6.sin6_port;
12532                         break;
12533 #endif
12534                 default:
12535                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12536                         error = EAFNOSUPPORT;
12537                         goto out_unlocked;
12538                 }
12539         } else
12540                 port = 0;
12541
12542         if (srcv) {
12543                 sinfo_flags = srcv->sinfo_flags;
12544                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12545                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12546                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12547                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12548                         error = EINVAL;
12549                         goto out_unlocked;
12550                 }
12551                 if (srcv->sinfo_flags)
12552                         SCTP_STAT_INCR(sctps_sends_with_flags);
12553         } else {
12554                 sinfo_flags = inp->def_send.sinfo_flags;
12555                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12556         }
12557         if (sinfo_flags & SCTP_SENDALL) {
12558                 /* its a sendall */
12559                 error = sctp_sendall(inp, uio, top, srcv);
12560                 top = NULL;
12561                 goto out_unlocked;
12562         }
12563         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12564                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12565                 error = EINVAL;
12566                 goto out_unlocked;
12567         }
12568         /* now we must find the assoc */
12569         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12570             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12571                 SCTP_INP_RLOCK(inp);
12572                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12573                 if (stcb) {
12574                         SCTP_TCB_LOCK(stcb);
12575                         hold_tcblock = 1;
12576                 }
12577                 SCTP_INP_RUNLOCK(inp);
12578         } else if (sinfo_assoc_id) {
12579                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12580         } else if (addr) {
12581                 /*-
12582                  * Since we did not use findep we must
12583                  * increment it, and if we don't find a tcb
12584                  * decrement it.
12585                  */
12586                 SCTP_INP_WLOCK(inp);
12587                 SCTP_INP_INCR_REF(inp);
12588                 SCTP_INP_WUNLOCK(inp);
12589                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12590                 if (stcb == NULL) {
12591                         SCTP_INP_WLOCK(inp);
12592                         SCTP_INP_DECR_REF(inp);
12593                         SCTP_INP_WUNLOCK(inp);
12594                 } else {
12595                         hold_tcblock = 1;
12596                 }
12597         }
12598         if ((stcb == NULL) && (addr)) {
12599                 /* Possible implicit send? */
12600                 SCTP_ASOC_CREATE_LOCK(inp);
12601                 create_lock_applied = 1;
12602                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12603                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12604                         /* Should I really unlock ? */
12605                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606                         error = EINVAL;
12607                         goto out_unlocked;
12608
12609                 }
12610                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12611                     (addr->sa_family == AF_INET6)) {
12612                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12613                         error = EINVAL;
12614                         goto out_unlocked;
12615                 }
12616                 SCTP_INP_WLOCK(inp);
12617                 SCTP_INP_INCR_REF(inp);
12618                 SCTP_INP_WUNLOCK(inp);
12619                 /* With the lock applied look again */
12620                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12621                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12622                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12623                 }
12624                 if (stcb == NULL) {
12625                         SCTP_INP_WLOCK(inp);
12626                         SCTP_INP_DECR_REF(inp);
12627                         SCTP_INP_WUNLOCK(inp);
12628                 } else {
12629                         hold_tcblock = 1;
12630                 }
12631                 if (error) {
12632                         goto out_unlocked;
12633                 }
12634                 if (t_inp != inp) {
12635                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12636                         error = ENOTCONN;
12637                         goto out_unlocked;
12638                 }
12639         }
12640         if (stcb == NULL) {
12641                 if (addr == NULL) {
12642                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12643                         error = ENOENT;
12644                         goto out_unlocked;
12645                 } else {
12646                         /* We must go ahead and start the INIT process */
12647                         uint32_t vrf_id;
12648
12649                         if ((sinfo_flags & SCTP_ABORT) ||
12650                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12651                                 /*-
12652                                  * User asks to abort a non-existant assoc,
12653                                  * or EOF a non-existant assoc with no data
12654                                  */
12655                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12656                                 error = ENOENT;
12657                                 goto out_unlocked;
12658                         }
12659                         /* get an asoc/stcb struct */
12660                         vrf_id = inp->def_vrf_id;
12661 #ifdef INVARIANTS
12662                         if (create_lock_applied == 0) {
12663                                 panic("Error, should hold create lock and I don't?");
12664                         }
12665 #endif
12666                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12667                             inp->sctp_ep.pre_open_stream_count,
12668                             p
12669                             );
12670                         if (stcb == NULL) {
12671                                 /* Error is setup for us in the call */
12672                                 goto out_unlocked;
12673                         }
12674                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12675                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12676                                 /*
12677                                  * Set the connected flag so we can queue
12678                                  * data
12679                                  */
12680                                 soisconnecting(so);
12681                         }
12682                         hold_tcblock = 1;
12683                         if (create_lock_applied) {
12684                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12685                                 create_lock_applied = 0;
12686                         } else {
12687                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12688                         }
12689                         /*
12690                          * Turn on queue only flag to prevent data from
12691                          * being sent
12692                          */
12693                         queue_only = 1;
12694                         asoc = &stcb->asoc;
12695                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12696                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12697
12698                         /* initialize authentication params for the assoc */
12699                         sctp_initialize_auth_params(inp, stcb);
12700
12701                         if (control) {
12702                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12703                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12704                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12705                                         hold_tcblock = 0;
12706                                         stcb = NULL;
12707                                         goto out_unlocked;
12708                                 }
12709                         }
12710                         /* out with the INIT */
12711                         queue_only_for_init = 1;
12712                         /*-
12713                          * we may want to dig in after this call and adjust the MTU
12714                          * value. It defaulted to 1500 (constant) but the ro
12715                          * structure may now have an update and thus we may need to
12716                          * change it BEFORE we append the message.
12717                          */
12718                 }
12719         } else
12720                 asoc = &stcb->asoc;
12721         if (srcv == NULL)
12722                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12723         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12724                 if (addr)
12725                         net = sctp_findnet(stcb, addr);
12726                 else
12727                         net = NULL;
12728                 if ((net == NULL) ||
12729                     ((port != 0) && (port != stcb->rport))) {
12730                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12731                         error = EINVAL;
12732                         goto out_unlocked;
12733                 }
12734         } else {
12735                 if (stcb->asoc.alternate) {
12736                         net = stcb->asoc.alternate;
12737                 } else {
12738                         net = stcb->asoc.primary_destination;
12739                 }
12740         }
12741         atomic_add_int(&stcb->total_sends, 1);
12742         /* Keep the stcb from being freed under our feet */
12743         atomic_add_int(&asoc->refcnt, 1);
12744         free_cnt_applied = 1;
12745
12746         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12747                 if (sndlen > asoc->smallest_mtu) {
12748                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12749                         error = EMSGSIZE;
12750                         goto out_unlocked;
12751                 }
12752         }
12753         if (SCTP_SO_IS_NBIO(so)
12754             || (flags & MSG_NBIO)
12755             ) {
12756                 non_blocking = 1;
12757         }
12758         /* would we block? */
12759         if (non_blocking) {
12760                 if (hold_tcblock == 0) {
12761                         SCTP_TCB_LOCK(stcb);
12762                         hold_tcblock = 1;
12763                 }
12764                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12765                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12766                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12767                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12768                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12769                                 error = EMSGSIZE;
12770                         else
12771                                 error = EWOULDBLOCK;
12772                         goto out_unlocked;
12773                 }
12774                 stcb->asoc.sb_send_resv += sndlen;
12775                 SCTP_TCB_UNLOCK(stcb);
12776                 hold_tcblock = 0;
12777         } else {
12778                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12779         }
12780         local_soresv = sndlen;
12781         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12782                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12783                 error = ECONNRESET;
12784                 goto out_unlocked;
12785         }
12786         if (create_lock_applied) {
12787                 SCTP_ASOC_CREATE_UNLOCK(inp);
12788                 create_lock_applied = 0;
12789         }
12790         /* Is the stream no. valid? */
12791         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12792                 /* Invalid stream number */
12793                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12794                 error = EINVAL;
12795                 goto out_unlocked;
12796         }
12797         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12798             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12799                 /*
12800                  * Can't queue any data while stream reset is underway.
12801                  */
12802                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12803                         error = EAGAIN;
12804                 } else {
12805                         error = EINVAL;
12806                 }
12807                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12808                 goto out_unlocked;
12809         }
12810         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12811             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12812                 queue_only = 1;
12813         }
12814         /* we are now done with all control */
12815         if (control) {
12816                 sctp_m_freem(control);
12817                 control = NULL;
12818         }
12819         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12820             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12821             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12822             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12823                 if (srcv->sinfo_flags & SCTP_ABORT) {
12824                         ;
12825                 } else {
12826                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12827                         error = ECONNRESET;
12828                         goto out_unlocked;
12829                 }
12830         }
12831         /* Ok, we will attempt a msgsnd :> */
12832         if (p) {
12833                 p->td_ru.ru_msgsnd++;
12834         }
12835         /* Are we aborting? */
12836         if (srcv->sinfo_flags & SCTP_ABORT) {
12837                 struct mbuf *mm;
12838                 int tot_demand, tot_out = 0, max_out;
12839
12840                 SCTP_STAT_INCR(sctps_sends_with_abort);
12841                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12842                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12843                         /* It has to be up before we abort */
12844                         /* how big is the user initiated abort? */
12845                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12846                         error = EINVAL;
12847                         goto out;
12848                 }
12849                 if (hold_tcblock) {
12850                         SCTP_TCB_UNLOCK(stcb);
12851                         hold_tcblock = 0;
12852                 }
12853                 if (top) {
12854                         struct mbuf *cntm = NULL;
12855
12856                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12857                         if (sndlen != 0) {
12858                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12859                                         tot_out += SCTP_BUF_LEN(cntm);
12860                                 }
12861                         }
12862                 } else {
12863                         /* Must fit in a MTU */
12864                         tot_out = sndlen;
12865                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12866                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12867                                 /* To big */
12868                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12869                                 error = EMSGSIZE;
12870                                 goto out;
12871                         }
12872                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12873                 }
12874                 if (mm == NULL) {
12875                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12876                         error = ENOMEM;
12877                         goto out;
12878                 }
12879                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12880                 max_out -= sizeof(struct sctp_abort_msg);
12881                 if (tot_out > max_out) {
12882                         tot_out = max_out;
12883                 }
12884                 if (mm) {
12885                         struct sctp_paramhdr *ph;
12886
12887                         /* now move forward the data pointer */
12888                         ph = mtod(mm, struct sctp_paramhdr *);
12889                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12890                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12891                         ph++;
12892                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12893                         if (top == NULL) {
12894                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12895                                 if (error) {
12896                                         /*-
12897                                          * Here if we can't get his data we
12898                                          * still abort we just don't get to
12899                                          * send the users note :-0
12900                                          */
12901                                         sctp_m_freem(mm);
12902                                         mm = NULL;
12903                                 }
12904                         } else {
12905                                 if (sndlen != 0) {
12906                                         SCTP_BUF_NEXT(mm) = top;
12907                                 }
12908                         }
12909                 }
12910                 if (hold_tcblock == 0) {
12911                         SCTP_TCB_LOCK(stcb);
12912                 }
12913                 atomic_add_int(&stcb->asoc.refcnt, -1);
12914                 free_cnt_applied = 0;
12915                 /* release this lock, otherwise we hang on ourselves */
12916                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12917                 /* now relock the stcb so everything is sane */
12918                 hold_tcblock = 0;
12919                 stcb = NULL;
12920                 /*
12921                  * In this case top is already chained to mm avoid double
12922                  * free, since we free it below if top != NULL and driver
12923                  * would free it after sending the packet out
12924                  */
12925                 if (sndlen != 0) {
12926                         top = NULL;
12927                 }
12928                 goto out_unlocked;
12929         }
12930         /* Calculate the maximum we can send */
12931         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12932         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12933                 if (non_blocking) {
12934                         /* we already checked for non-blocking above. */
12935                         max_len = sndlen;
12936                 } else {
12937                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12938                 }
12939         } else {
12940                 max_len = 0;
12941         }
12942         if (hold_tcblock) {
12943                 SCTP_TCB_UNLOCK(stcb);
12944                 hold_tcblock = 0;
12945         }
12946         if (asoc->strmout == NULL) {
12947                 /* huh? software error */
12948                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12949                 error = EFAULT;
12950                 goto out_unlocked;
12951         }
12952         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12953         if ((user_marks_eor == 0) &&
12954             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12955                 /* It will NEVER fit */
12956                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12957                 error = EMSGSIZE;
12958                 goto out_unlocked;
12959         }
12960         if ((uio == NULL) && user_marks_eor) {
12961                 /*-
12962                  * We do not support eeor mode for
12963                  * sending with mbuf chains (like sendfile).
12964                  */
12965                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12966                 error = EINVAL;
12967                 goto out_unlocked;
12968         }
12969         if (user_marks_eor) {
12970                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12971         } else {
12972                 /*-
12973                  * For non-eeor the whole message must fit in
12974                  * the socket send buffer.
12975                  */
12976                 local_add_more = sndlen;
12977         }
12978         len = 0;
12979         if (non_blocking) {
12980                 goto skip_preblock;
12981         }
12982         if (((max_len <= local_add_more) &&
12983             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12984             (max_len == 0) ||
12985             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12986                 /* No room right now ! */
12987                 SOCKBUF_LOCK(&so->so_snd);
12988                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12989                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12990                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12991                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12992                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12993                             inqueue_bytes,
12994                             local_add_more,
12995                             stcb->asoc.stream_queue_cnt,
12996                             stcb->asoc.chunks_on_out_queue,
12997                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12998                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12999                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13000                         }
13001                         be.error = 0;
13002                         stcb->block_entry = &be;
13003                         error = sbwait(&so->so_snd);
13004                         stcb->block_entry = NULL;
13005                         if (error || so->so_error || be.error) {
13006                                 if (error == 0) {
13007                                         if (so->so_error)
13008                                                 error = so->so_error;
13009                                         if (be.error) {
13010                                                 error = be.error;
13011                                         }
13012                                 }
13013                                 SOCKBUF_UNLOCK(&so->so_snd);
13014                                 goto out_unlocked;
13015                         }
13016                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13017                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13018                                     asoc, stcb->asoc.total_output_queue_size);
13019                         }
13020                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13021                                 goto out_unlocked;
13022                         }
13023                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13024                 }
13025                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13026                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13027                 } else {
13028                         max_len = 0;
13029                 }
13030                 SOCKBUF_UNLOCK(&so->so_snd);
13031         }
13032 skip_preblock:
13033         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13034                 goto out_unlocked;
13035         }
13036         /*
13037          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13038          * case NOTE: uio will be null when top/mbuf is passed
13039          */
13040         if (sndlen == 0) {
13041                 if (srcv->sinfo_flags & SCTP_EOF) {
13042                         got_all_of_the_send = 1;
13043                         goto dataless_eof;
13044                 } else {
13045                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13046                         error = EINVAL;
13047                         goto out;
13048                 }
13049         }
13050         if (top == NULL) {
13051                 struct sctp_stream_queue_pending *sp;
13052                 struct sctp_stream_out *strm;
13053                 uint32_t sndout;
13054
13055                 SCTP_TCB_SEND_LOCK(stcb);
13056                 if ((asoc->stream_locked) &&
13057                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13058                         SCTP_TCB_SEND_UNLOCK(stcb);
13059                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13060                         error = EINVAL;
13061                         goto out;
13062                 }
13063                 SCTP_TCB_SEND_UNLOCK(stcb);
13064
13065                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13066                 if (strm->last_msg_incomplete == 0) {
13067         do_a_copy_in:
13068                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13069                         if ((sp == NULL) || (error)) {
13070                                 goto out;
13071                         }
13072                         SCTP_TCB_SEND_LOCK(stcb);
13073                         if (sp->msg_is_complete) {
13074                                 strm->last_msg_incomplete = 0;
13075                                 asoc->stream_locked = 0;
13076                         } else {
13077                                 /*
13078                                  * Just got locked to this guy in case of an
13079                                  * interrupt.
13080                                  */
13081                                 strm->last_msg_incomplete = 1;
13082                                 asoc->stream_locked = 1;
13083                                 asoc->stream_locked_on = srcv->sinfo_stream;
13084                                 sp->sender_all_done = 0;
13085                         }
13086                         sctp_snd_sb_alloc(stcb, sp->length);
13087                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13088                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13089                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13090                         }
13091                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13092                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13093                         SCTP_TCB_SEND_UNLOCK(stcb);
13094                 } else {
13095                         SCTP_TCB_SEND_LOCK(stcb);
13096                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13097                         SCTP_TCB_SEND_UNLOCK(stcb);
13098                         if (sp == NULL) {
13099                                 /* ???? Huh ??? last msg is gone */
13100 #ifdef INVARIANTS
13101                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13102 #else
13103                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13104                                 strm->last_msg_incomplete = 0;
13105 #endif
13106                                 goto do_a_copy_in;
13107
13108                         }
13109                 }
13110                 while (uio->uio_resid > 0) {
13111                         /* How much room do we have? */
13112                         struct mbuf *new_tail, *mm;
13113
13114                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13115                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13116                         else
13117                                 max_len = 0;
13118
13119                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13120                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13121                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13122                                 sndout = 0;
13123                                 new_tail = NULL;
13124                                 if (hold_tcblock) {
13125                                         SCTP_TCB_UNLOCK(stcb);
13126                                         hold_tcblock = 0;
13127                                 }
13128                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13129                                 if ((mm == NULL) || error) {
13130                                         if (mm) {
13131                                                 sctp_m_freem(mm);
13132                                         }
13133                                         goto out;
13134                                 }
13135                                 /* Update the mbuf and count */
13136                                 SCTP_TCB_SEND_LOCK(stcb);
13137                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13138                                         /*
13139                                          * we need to get out. Peer probably
13140                                          * aborted.
13141                                          */
13142                                         sctp_m_freem(mm);
13143                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13144                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13145                                                 error = ECONNRESET;
13146                                         }
13147                                         SCTP_TCB_SEND_UNLOCK(stcb);
13148                                         goto out;
13149                                 }
13150                                 if (sp->tail_mbuf) {
13151                                         /* tack it to the end */
13152                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13153                                         sp->tail_mbuf = new_tail;
13154                                 } else {
13155                                         /* A stolen mbuf */
13156                                         sp->data = mm;
13157                                         sp->tail_mbuf = new_tail;
13158                                 }
13159                                 sctp_snd_sb_alloc(stcb, sndout);
13160                                 atomic_add_int(&sp->length, sndout);
13161                                 len += sndout;
13162
13163                                 /* Did we reach EOR? */
13164                                 if ((uio->uio_resid == 0) &&
13165                                     ((user_marks_eor == 0) ||
13166                                     (srcv->sinfo_flags & SCTP_EOF) ||
13167                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13168                                         sp->msg_is_complete = 1;
13169                                 } else {
13170                                         sp->msg_is_complete = 0;
13171                                 }
13172                                 SCTP_TCB_SEND_UNLOCK(stcb);
13173                         }
13174                         if (uio->uio_resid == 0) {
13175                                 /* got it all? */
13176                                 continue;
13177                         }
13178                         /* PR-SCTP? */
13179                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13180                                 /*
13181                                  * This is ugly but we must assure locking
13182                                  * order
13183                                  */
13184                                 if (hold_tcblock == 0) {
13185                                         SCTP_TCB_LOCK(stcb);
13186                                         hold_tcblock = 1;
13187                                 }
13188                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13189                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13190                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13191                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13192                                 else
13193                                         max_len = 0;
13194                                 if (max_len > 0) {
13195                                         continue;
13196                                 }
13197                                 SCTP_TCB_UNLOCK(stcb);
13198                                 hold_tcblock = 0;
13199                         }
13200                         /* wait for space now */
13201                         if (non_blocking) {
13202                                 /* Non-blocking io in place out */
13203                                 goto skip_out_eof;
13204                         }
13205                         /* What about the INIT, send it maybe */
13206                         if (queue_only_for_init) {
13207                                 if (hold_tcblock == 0) {
13208                                         SCTP_TCB_LOCK(stcb);
13209                                         hold_tcblock = 1;
13210                                 }
13211                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13212                                         /* a collision took us forward? */
13213                                         queue_only = 0;
13214                                 } else {
13215                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13216                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13217                                         queue_only = 1;
13218                                 }
13219                         }
13220                         if ((net->flight_size > net->cwnd) &&
13221                             (asoc->sctp_cmt_on_off == 0)) {
13222                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13223                                 queue_only = 1;
13224                         } else if (asoc->ifp_had_enobuf) {
13225                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13226                                 if (net->flight_size > (2 * net->mtu)) {
13227                                         queue_only = 1;
13228                                 }
13229                                 asoc->ifp_had_enobuf = 0;
13230                         }
13231                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13232                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13233                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13234                             (stcb->asoc.total_flight > 0) &&
13235                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13236                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13237
13238                                 /*-
13239                                  * Ok, Nagle is set on and we have data outstanding.
13240                                  * Don't send anything and let SACKs drive out the
13241                                  * data unless we have a "full" segment to send.
13242                                  */
13243                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13244                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13245                                 }
13246                                 SCTP_STAT_INCR(sctps_naglequeued);
13247                                 nagle_applies = 1;
13248                         } else {
13249                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13250                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13251                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13252                                 }
13253                                 SCTP_STAT_INCR(sctps_naglesent);
13254                                 nagle_applies = 0;
13255                         }
13256                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13257
13258                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13259                                     nagle_applies, un_sent);
13260                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13261                                     stcb->asoc.total_flight,
13262                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13263                         }
13264                         if (queue_only_for_init)
13265                                 queue_only_for_init = 0;
13266                         if ((queue_only == 0) && (nagle_applies == 0)) {
13267                                 /*-
13268                                  * need to start chunk output
13269                                  * before blocking.. note that if
13270                                  * a lock is already applied, then
13271                                  * the input via the net is happening
13272                                  * and I don't need to start output :-D
13273                                  */
13274                                 if (hold_tcblock == 0) {
13275                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13276                                                 hold_tcblock = 1;
13277                                                 sctp_chunk_output(inp,
13278                                                     stcb,
13279                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13280                                         }
13281                                 } else {
13282                                         sctp_chunk_output(inp,
13283                                             stcb,
13284                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13285                                 }
13286                                 if (hold_tcblock == 1) {
13287                                         SCTP_TCB_UNLOCK(stcb);
13288                                         hold_tcblock = 0;
13289                                 }
13290                         }
13291                         SOCKBUF_LOCK(&so->so_snd);
13292                         /*-
13293                          * This is a bit strange, but I think it will
13294                          * work. The total_output_queue_size is locked and
13295                          * protected by the TCB_LOCK, which we just released.
13296                          * There is a race that can occur between releasing it
13297                          * above, and me getting the socket lock, where sacks
13298                          * come in but we have not put the SB_WAIT on the
13299                          * so_snd buffer to get the wakeup. After the LOCK
13300                          * is applied the sack_processing will also need to
13301                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13302                          * once we have the socket buffer lock if we recheck the
13303                          * size we KNOW we will get to sleep safely with the
13304                          * wakeup flag in place.
13305                          */
13306                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13307                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13308                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13309                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13310                                             asoc, uio->uio_resid);
13311                                 }
13312                                 be.error = 0;
13313                                 stcb->block_entry = &be;
13314                                 error = sbwait(&so->so_snd);
13315                                 stcb->block_entry = NULL;
13316
13317                                 if (error || so->so_error || be.error) {
13318                                         if (error == 0) {
13319                                                 if (so->so_error)
13320                                                         error = so->so_error;
13321                                                 if (be.error) {
13322                                                         error = be.error;
13323                                                 }
13324                                         }
13325                                         SOCKBUF_UNLOCK(&so->so_snd);
13326                                         goto out_unlocked;
13327                                 }
13328                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13329                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13330                                             asoc, stcb->asoc.total_output_queue_size);
13331                                 }
13332                         }
13333                         SOCKBUF_UNLOCK(&so->so_snd);
13334                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13335                                 goto out_unlocked;
13336                         }
13337                 }
13338                 SCTP_TCB_SEND_LOCK(stcb);
13339                 if (sp) {
13340                         if (sp->msg_is_complete == 0) {
13341                                 strm->last_msg_incomplete = 1;
13342                                 asoc->stream_locked = 1;
13343                                 asoc->stream_locked_on = srcv->sinfo_stream;
13344                         } else {
13345                                 sp->sender_all_done = 1;
13346                                 strm->last_msg_incomplete = 0;
13347                                 asoc->stream_locked = 0;
13348                         }
13349                 } else {
13350                         SCTP_PRINTF("Huh no sp TSNH?\n");
13351                         strm->last_msg_incomplete = 0;
13352                         asoc->stream_locked = 0;
13353                 }
13354                 SCTP_TCB_SEND_UNLOCK(stcb);
13355                 if (uio->uio_resid == 0) {
13356                         got_all_of_the_send = 1;
13357                 }
13358         } else {
13359                 /* We send in a 0, since we do NOT have any locks */
13360                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13361                 top = NULL;
13362                 if (srcv->sinfo_flags & SCTP_EOF) {
13363                         /*
13364                          * This should only happen for Panda for the mbuf
13365                          * send case, which does NOT yet support EEOR mode.
13366                          * Thus, we can just set this flag to do the proper
13367                          * EOF handling.
13368                          */
13369                         got_all_of_the_send = 1;
13370                 }
13371         }
13372         if (error) {
13373                 goto out;
13374         }
13375 dataless_eof:
13376         /* EOF thing ? */
13377         if ((srcv->sinfo_flags & SCTP_EOF) &&
13378             (got_all_of_the_send == 1)) {
13379                 int cnt;
13380
13381                 SCTP_STAT_INCR(sctps_sends_with_eof);
13382                 error = 0;
13383                 if (hold_tcblock == 0) {
13384                         SCTP_TCB_LOCK(stcb);
13385                         hold_tcblock = 1;
13386                 }
13387                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13388                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13389                     TAILQ_EMPTY(&asoc->sent_queue) &&
13390                     (cnt == 0)) {
13391                         if (asoc->locked_on_sending) {
13392                                 goto abort_anyway;
13393                         }
13394                         /* there is nothing queued to send, so I'm done... */
13395                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13396                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13397                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13398                                 struct sctp_nets *netp;
13399
13400                                 /* only send SHUTDOWN the first time through */
13401                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13402                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13403                                 }
13404                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13405                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13406                                 sctp_stop_timers_for_shutdown(stcb);
13407                                 if (stcb->asoc.alternate) {
13408                                         netp = stcb->asoc.alternate;
13409                                 } else {
13410                                         netp = stcb->asoc.primary_destination;
13411                                 }
13412                                 sctp_send_shutdown(stcb, netp);
13413                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13414                                     netp);
13415                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13416                                     asoc->primary_destination);
13417                         }
13418                 } else {
13419                         /*-
13420                          * we still got (or just got) data to send, so set
13421                          * SHUTDOWN_PENDING
13422                          */
13423                         /*-
13424                          * XXX sockets draft says that SCTP_EOF should be
13425                          * sent with no data.  currently, we will allow user
13426                          * data to be sent first and move to
13427                          * SHUTDOWN-PENDING
13428                          */
13429                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13430                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13431                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13432                                 if (hold_tcblock == 0) {
13433                                         SCTP_TCB_LOCK(stcb);
13434                                         hold_tcblock = 1;
13435                                 }
13436                                 if (asoc->locked_on_sending) {
13437                                         /* Locked to send out the data */
13438                                         struct sctp_stream_queue_pending *sp;
13439
13440                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13441                                         if (sp) {
13442                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13443                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13444                                         }
13445                                 }
13446                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13447                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13448                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13449                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13450                                         struct mbuf *op_err;
13451                                         char msg[SCTP_DIAG_INFO_LEN];
13452
13453                         abort_anyway:
13454                                         if (free_cnt_applied) {
13455                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13456                                                 free_cnt_applied = 0;
13457                                         }
13458                                         snprintf(msg, sizeof(msg),
13459                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13460                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13461                                             msg);
13462                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13463                                             op_err, SCTP_SO_LOCKED);
13464                                         /*
13465                                          * now relock the stcb so everything
13466                                          * is sane
13467                                          */
13468                                         hold_tcblock = 0;
13469                                         stcb = NULL;
13470                                         goto out;
13471                                 }
13472                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13473                                     asoc->primary_destination);
13474                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13475                         }
13476                 }
13477         }
13478 skip_out_eof:
13479         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13480                 some_on_control = 1;
13481         }
13482         if (queue_only_for_init) {
13483                 if (hold_tcblock == 0) {
13484                         SCTP_TCB_LOCK(stcb);
13485                         hold_tcblock = 1;
13486                 }
13487                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13488                         /* a collision took us forward? */
13489                         queue_only = 0;
13490                 } else {
13491                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13492                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13493                         queue_only = 1;
13494                 }
13495         }
13496         if ((net->flight_size > net->cwnd) &&
13497             (stcb->asoc.sctp_cmt_on_off == 0)) {
13498                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13499                 queue_only = 1;
13500         } else if (asoc->ifp_had_enobuf) {
13501                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13502                 if (net->flight_size > (2 * net->mtu)) {
13503                         queue_only = 1;
13504                 }
13505                 asoc->ifp_had_enobuf = 0;
13506         }
13507         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13508             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13509         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13510             (stcb->asoc.total_flight > 0) &&
13511             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13512             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13513                 /*-
13514                  * Ok, Nagle is set on and we have data outstanding.
13515                  * Don't send anything and let SACKs drive out the
13516                  * data unless wen have a "full" segment to send.
13517                  */
13518                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13519                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13520                 }
13521                 SCTP_STAT_INCR(sctps_naglequeued);
13522                 nagle_applies = 1;
13523         } else {
13524                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13525                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13526                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13527                 }
13528                 SCTP_STAT_INCR(sctps_naglesent);
13529                 nagle_applies = 0;
13530         }
13531         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13532                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13533                     nagle_applies, un_sent);
13534                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13535                     stcb->asoc.total_flight,
13536                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13537         }
13538         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13539                 /* we can attempt to send too. */
13540                 if (hold_tcblock == 0) {
13541                         /*
13542                          * If there is activity recv'ing sacks no need to
13543                          * send
13544                          */
13545                         if (SCTP_TCB_TRYLOCK(stcb)) {
13546                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13547                                 hold_tcblock = 1;
13548                         }
13549                 } else {
13550                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13551                 }
13552         } else if ((queue_only == 0) &&
13553                     (stcb->asoc.peers_rwnd == 0) &&
13554             (stcb->asoc.total_flight == 0)) {
13555                 /* We get to have a probe outstanding */
13556                 if (hold_tcblock == 0) {
13557                         hold_tcblock = 1;
13558                         SCTP_TCB_LOCK(stcb);
13559                 }
13560                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13561         } else if (some_on_control) {
13562                 int num_out, reason, frag_point;
13563
13564                 /* Here we do control only */
13565                 if (hold_tcblock == 0) {
13566                         hold_tcblock = 1;
13567                         SCTP_TCB_LOCK(stcb);
13568                 }
13569                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13570                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13571                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13572         }
13573         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13574             queue_only, stcb->asoc.peers_rwnd, un_sent,
13575             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13576             stcb->asoc.total_output_queue_size, error);
13577
13578 out:
13579 out_unlocked:
13580
13581         if (local_soresv && stcb) {
13582                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13583         }
13584         if (create_lock_applied) {
13585                 SCTP_ASOC_CREATE_UNLOCK(inp);
13586         }
13587         if ((stcb) && hold_tcblock) {
13588                 SCTP_TCB_UNLOCK(stcb);
13589         }
13590         if (stcb && free_cnt_applied) {
13591                 atomic_add_int(&stcb->asoc.refcnt, -1);
13592         }
13593 #ifdef INVARIANTS
13594         if (stcb) {
13595                 if (mtx_owned(&stcb->tcb_mtx)) {
13596                         panic("Leaving with tcb mtx owned?");
13597                 }
13598                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13599                         panic("Leaving with tcb send mtx owned?");
13600                 }
13601         }
13602 #endif
13603         if (top) {
13604                 sctp_m_freem(top);
13605         }
13606         if (control) {
13607                 sctp_m_freem(control);
13608         }
13609         return (error);
13610 }
13611
13612
13613 /*
13614  * generate an AUTHentication chunk, if required
13615  */
13616 struct mbuf *
13617 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13618     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13619     struct sctp_tcb *stcb, uint8_t chunk)
13620 {
13621         struct mbuf *m_auth;
13622         struct sctp_auth_chunk *auth;
13623         int chunk_len;
13624         struct mbuf *cn;
13625
13626         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13627             (stcb == NULL))
13628                 return (m);
13629
13630         if (stcb->asoc.auth_supported == 0) {
13631                 return (m);
13632         }
13633         /* does the requested chunk require auth? */
13634         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13635                 return (m);
13636         }
13637         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13638         if (m_auth == NULL) {
13639                 /* no mbuf's */
13640                 return (m);
13641         }
13642         /* reserve some space if this will be the first mbuf */
13643         if (m == NULL)
13644                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13645         /* fill in the AUTH chunk details */
13646         auth = mtod(m_auth, struct sctp_auth_chunk *);
13647         bzero(auth, sizeof(*auth));
13648         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13649         auth->ch.chunk_flags = 0;
13650         chunk_len = sizeof(*auth) +
13651             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13652         auth->ch.chunk_length = htons(chunk_len);
13653         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13654         /* key id and hmac digest will be computed and filled in upon send */
13655
13656         /* save the offset where the auth was inserted into the chain */
13657         *offset = 0;
13658         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13659                 *offset += SCTP_BUF_LEN(cn);
13660         }
13661
13662         /* update length and return pointer to the auth chunk */
13663         SCTP_BUF_LEN(m_auth) = chunk_len;
13664         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13665         if (auth_ret != NULL)
13666                 *auth_ret = auth;
13667
13668         return (m);
13669 }
13670
13671 #ifdef INET6
13672 int
13673 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13674 {
13675         struct nd_prefix *pfx = NULL;
13676         struct nd_pfxrouter *pfxrtr = NULL;
13677         struct sockaddr_in6 gw6;
13678
13679         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13680                 return (0);
13681
13682         /* get prefix entry of address */
13683         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13684                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13685                         continue;
13686                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13687                     &src6->sin6_addr, &pfx->ndpr_mask))
13688                         break;
13689         }
13690         /* no prefix entry in the prefix list */
13691         if (pfx == NULL) {
13692                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13693                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13694                 return (0);
13695         }
13696         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13697         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13698
13699         /* search installed gateway from prefix entry */
13700         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13701                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13702                 gw6.sin6_family = AF_INET6;
13703                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13704                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13705                     sizeof(struct in6_addr));
13706                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13707                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13708                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13709                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13710                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13711                     ro->ro_rt->rt_gateway)) {
13712                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13713                         return (1);
13714                 }
13715         }
13716         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13717         return (0);
13718 }
13719
13720 #endif
13721
13722 int
13723 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13724 {
13725 #ifdef INET
13726         struct sockaddr_in *sin, *mask;
13727         struct ifaddr *ifa;
13728         struct in_addr srcnetaddr, gwnetaddr;
13729
13730         if (ro == NULL || ro->ro_rt == NULL ||
13731             sifa->address.sa.sa_family != AF_INET) {
13732                 return (0);
13733         }
13734         ifa = (struct ifaddr *)sifa->ifa;
13735         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13736         sin = &sifa->address.sin;
13737         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13738         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13739         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13740         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13741
13742         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13743         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13744         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13745         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13746         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13747         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13748                 return (1);
13749         }
13750 #endif
13751         return (0);
13752 }