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 const 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 *paramh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946 #endif
1947
1948         switch (ifa->address.sa.sa_family) {
1949 #ifdef INET
1950         case AF_INET:
1951                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952                 break;
1953 #endif
1954 #ifdef INET6
1955         case AF_INET6:
1956                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957                 break;
1958 #endif
1959         default:
1960                 return (m);
1961         }
1962 #if defined(INET) || defined(INET6)
1963         if (M_TRAILINGSPACE(m) >= plen) {
1964                 /* easy side we just drop it on the end */
1965                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 paramh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = &ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1991                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         paramh->param_length = htons(plen);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += plen;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = &ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2006                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         paramh->param_length = htons(plen);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += plen;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         if (len != NULL) {
2020                 *len += plen;
2021         }
2022         return (mret);
2023 #endif
2024 }
2025
2026
2027 struct mbuf *
2028 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2029     struct sctp_scoping *scope,
2030     struct mbuf *m_at, int cnt_inits_to,
2031     uint16_t *padding_len, uint16_t *chunk_len)
2032 {
2033         struct sctp_vrf *vrf = NULL;
2034         int cnt, limit_out = 0, total_count;
2035         uint32_t vrf_id;
2036
2037         vrf_id = inp->def_vrf_id;
2038         SCTP_IPI_ADDR_RLOCK();
2039         vrf = sctp_find_vrf(vrf_id);
2040         if (vrf == NULL) {
2041                 SCTP_IPI_ADDR_RUNLOCK();
2042                 return (m_at);
2043         }
2044         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2045                 struct sctp_ifa *sctp_ifap;
2046                 struct sctp_ifn *sctp_ifnp;
2047
2048                 cnt = cnt_inits_to;
2049                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2050                         limit_out = 1;
2051                         cnt = SCTP_ADDRESS_LIMIT;
2052                         goto skip_count;
2053                 }
2054                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2055                         if ((scope->loopback_scope == 0) &&
2056                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2057                                 /*
2058                                  * Skip loopback devices if loopback_scope
2059                                  * not set
2060                                  */
2061                                 continue;
2062                         }
2063                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2064 #ifdef INET
2065                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2066                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2067                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2068                                         continue;
2069                                 }
2070 #endif
2071 #ifdef INET6
2072                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2073                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2074                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2075                                         continue;
2076                                 }
2077 #endif
2078                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2079                                         continue;
2080                                 }
2081                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2082                                         continue;
2083                                 }
2084                                 cnt++;
2085                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2086                                         break;
2087                                 }
2088                         }
2089                         if (cnt > SCTP_ADDRESS_LIMIT) {
2090                                 break;
2091                         }
2092                 }
2093 skip_count:
2094                 if (cnt > 1) {
2095                         total_count = 0;
2096                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2097                                 cnt = 0;
2098                                 if ((scope->loopback_scope == 0) &&
2099                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2100                                         /*
2101                                          * Skip loopback devices if
2102                                          * loopback_scope not set
2103                                          */
2104                                         continue;
2105                                 }
2106                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2107 #ifdef INET
2108                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2109                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2110                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2111                                                 continue;
2112                                         }
2113 #endif
2114 #ifdef INET6
2115                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2116                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2117                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2118                                                 continue;
2119                                         }
2120 #endif
2121                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2122                                                 continue;
2123                                         }
2124                                         if (sctp_is_address_in_scope(sctp_ifap,
2125                                             scope, 0) == 0) {
2126                                                 continue;
2127                                         }
2128                                         if ((chunk_len != NULL) &&
2129                                             (padding_len != NULL) &&
2130                                             (*padding_len > 0)) {
2131                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2132                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2133                                                 *chunk_len += *padding_len;
2134                                                 *padding_len = 0;
2135                                         }
2136                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2137                                         if (limit_out) {
2138                                                 cnt++;
2139                                                 total_count++;
2140                                                 if (cnt >= 2) {
2141                                                         /*
2142                                                          * two from each
2143                                                          * address
2144                                                          */
2145                                                         break;
2146                                                 }
2147                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2148                                                         /* No more addresses */
2149                                                         break;
2150                                                 }
2151                                         }
2152                                 }
2153                         }
2154                 }
2155         } else {
2156                 struct sctp_laddr *laddr;
2157
2158                 cnt = cnt_inits_to;
2159                 /* First, how many ? */
2160                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2161                         if (laddr->ifa == NULL) {
2162                                 continue;
2163                         }
2164                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2165                                 /*
2166                                  * Address being deleted by the system, dont
2167                                  * list.
2168                                  */
2169                                 continue;
2170                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2171                                 /*
2172                                  * Address being deleted on this ep don't
2173                                  * list.
2174                                  */
2175                                 continue;
2176                         }
2177                         if (sctp_is_address_in_scope(laddr->ifa,
2178                             scope, 1) == 0) {
2179                                 continue;
2180                         }
2181                         cnt++;
2182                 }
2183                 /*
2184                  * To get through a NAT we only list addresses if we have
2185                  * more than one. That way if you just bind a single address
2186                  * we let the source of the init dictate our address.
2187                  */
2188                 if (cnt > 1) {
2189                         cnt = cnt_inits_to;
2190                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2191                                 if (laddr->ifa == NULL) {
2192                                         continue;
2193                                 }
2194                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2195                                         continue;
2196                                 }
2197                                 if (sctp_is_address_in_scope(laddr->ifa,
2198                                     scope, 0) == 0) {
2199                                         continue;
2200                                 }
2201                                 if ((chunk_len != NULL) &&
2202                                     (padding_len != NULL) &&
2203                                     (*padding_len > 0)) {
2204                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2205                                         SCTP_BUF_LEN(m_at) += *padding_len;
2206                                         *chunk_len += *padding_len;
2207                                         *padding_len = 0;
2208                                 }
2209                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2210                                 cnt++;
2211                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2212                                         break;
2213                                 }
2214                         }
2215                 }
2216         }
2217         SCTP_IPI_ADDR_RUNLOCK();
2218         return (m_at);
2219 }
2220
2221 static struct sctp_ifa *
2222 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2223     uint8_t dest_is_loop,
2224     uint8_t dest_is_priv,
2225     sa_family_t fam)
2226 {
2227         uint8_t dest_is_global = 0;
2228
2229         /* dest_is_priv is true if destination is a private address */
2230         /* dest_is_loop is true if destination is a loopback addresses */
2231
2232         /**
2233          * Here we determine if its a preferred address. A preferred address
2234          * means it is the same scope or higher scope then the destination.
2235          * L = loopback, P = private, G = global
2236          * -----------------------------------------
2237          *    src    |  dest | result
2238          *  ----------------------------------------
2239          *     L     |    L  |    yes
2240          *  -----------------------------------------
2241          *     P     |    L  |    yes-v4 no-v6
2242          *  -----------------------------------------
2243          *     G     |    L  |    yes-v4 no-v6
2244          *  -----------------------------------------
2245          *     L     |    P  |    no
2246          *  -----------------------------------------
2247          *     P     |    P  |    yes
2248          *  -----------------------------------------
2249          *     G     |    P  |    no
2250          *   -----------------------------------------
2251          *     L     |    G  |    no
2252          *   -----------------------------------------
2253          *     P     |    G  |    no
2254          *    -----------------------------------------
2255          *     G     |    G  |    yes
2256          *    -----------------------------------------
2257          */
2258
2259         if (ifa->address.sa.sa_family != fam) {
2260                 /* forget mis-matched family */
2261                 return (NULL);
2262         }
2263         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2264                 dest_is_global = 1;
2265         }
2266         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2267         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2268         /* Ok the address may be ok */
2269 #ifdef INET6
2270         if (fam == AF_INET6) {
2271                 /* ok to use deprecated addresses? no lets not! */
2272                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2273                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2274                         return (NULL);
2275                 }
2276                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2277                         if (dest_is_loop) {
2278                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2279                                 return (NULL);
2280                         }
2281                 }
2282                 if (ifa->src_is_glob) {
2283                         if (dest_is_loop) {
2284                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2285                                 return (NULL);
2286                         }
2287                 }
2288         }
2289 #endif
2290         /*
2291          * Now that we know what is what, implement or table this could in
2292          * theory be done slicker (it used to be), but this is
2293          * straightforward and easier to validate :-)
2294          */
2295         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2296             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2297         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2298             dest_is_loop, dest_is_priv, dest_is_global);
2299
2300         if ((ifa->src_is_loop) && (dest_is_priv)) {
2301                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2302                 return (NULL);
2303         }
2304         if ((ifa->src_is_glob) && (dest_is_priv)) {
2305                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2306                 return (NULL);
2307         }
2308         if ((ifa->src_is_loop) && (dest_is_global)) {
2309                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2310                 return (NULL);
2311         }
2312         if ((ifa->src_is_priv) && (dest_is_global)) {
2313                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2314                 return (NULL);
2315         }
2316         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2317         /* its a preferred address */
2318         return (ifa);
2319 }
2320
2321 static struct sctp_ifa *
2322 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2323     uint8_t dest_is_loop,
2324     uint8_t dest_is_priv,
2325     sa_family_t fam)
2326 {
2327         uint8_t dest_is_global = 0;
2328
2329         /**
2330          * Here we determine if its a acceptable address. A acceptable
2331          * address means it is the same scope or higher scope but we can
2332          * allow for NAT which means its ok to have a global dest and a
2333          * private src.
2334          *
2335          * L = loopback, P = private, G = global
2336          * -----------------------------------------
2337          *  src    |  dest | result
2338          * -----------------------------------------
2339          *   L     |   L   |    yes
2340          *  -----------------------------------------
2341          *   P     |   L   |    yes-v4 no-v6
2342          *  -----------------------------------------
2343          *   G     |   L   |    yes
2344          * -----------------------------------------
2345          *   L     |   P   |    no
2346          * -----------------------------------------
2347          *   P     |   P   |    yes
2348          * -----------------------------------------
2349          *   G     |   P   |    yes - May not work
2350          * -----------------------------------------
2351          *   L     |   G   |    no
2352          * -----------------------------------------
2353          *   P     |   G   |    yes - May not work
2354          * -----------------------------------------
2355          *   G     |   G   |    yes
2356          * -----------------------------------------
2357          */
2358
2359         if (ifa->address.sa.sa_family != fam) {
2360                 /* forget non matching family */
2361                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2362                     ifa->address.sa.sa_family, fam);
2363                 return (NULL);
2364         }
2365         /* Ok the address may be ok */
2366         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2367         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2368             dest_is_loop, dest_is_priv);
2369         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2370                 dest_is_global = 1;
2371         }
2372 #ifdef INET6
2373         if (fam == AF_INET6) {
2374                 /* ok to use deprecated addresses? */
2375                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2376                         return (NULL);
2377                 }
2378                 if (ifa->src_is_priv) {
2379                         /* Special case, linklocal to loop */
2380                         if (dest_is_loop)
2381                                 return (NULL);
2382                 }
2383         }
2384 #endif
2385         /*
2386          * Now that we know what is what, implement our table. This could in
2387          * theory be done slicker (it used to be), but this is
2388          * straightforward and easier to validate :-)
2389          */
2390         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2391             ifa->src_is_loop,
2392             dest_is_priv);
2393         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2394                 return (NULL);
2395         }
2396         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2397             ifa->src_is_loop,
2398             dest_is_global);
2399         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2400                 return (NULL);
2401         }
2402         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2403         /* its an acceptable address */
2404         return (ifa);
2405 }
2406
2407 int
2408 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2409 {
2410         struct sctp_laddr *laddr;
2411
2412         if (stcb == NULL) {
2413                 /* There are no restrictions, no TCB :-) */
2414                 return (0);
2415         }
2416         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2417                 if (laddr->ifa == NULL) {
2418                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2419                             __func__);
2420                         continue;
2421                 }
2422                 if (laddr->ifa == ifa) {
2423                         /* Yes it is on the list */
2424                         return (1);
2425                 }
2426         }
2427         return (0);
2428 }
2429
2430
2431 int
2432 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2433 {
2434         struct sctp_laddr *laddr;
2435
2436         if (ifa == NULL)
2437                 return (0);
2438         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2439                 if (laddr->ifa == NULL) {
2440                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2441                             __func__);
2442                         continue;
2443                 }
2444                 if ((laddr->ifa == ifa) && laddr->action == 0)
2445                         /* same pointer */
2446                         return (1);
2447         }
2448         return (0);
2449 }
2450
2451
2452
2453 static struct sctp_ifa *
2454 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2455     sctp_route_t *ro,
2456     uint32_t vrf_id,
2457     int non_asoc_addr_ok,
2458     uint8_t dest_is_priv,
2459     uint8_t dest_is_loop,
2460     sa_family_t fam)
2461 {
2462         struct sctp_laddr *laddr, *starting_point;
2463         void *ifn;
2464         int resettotop = 0;
2465         struct sctp_ifn *sctp_ifn;
2466         struct sctp_ifa *sctp_ifa, *sifa;
2467         struct sctp_vrf *vrf;
2468         uint32_t ifn_index;
2469
2470         vrf = sctp_find_vrf(vrf_id);
2471         if (vrf == NULL)
2472                 return (NULL);
2473
2474         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2475         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2476         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2477         /*
2478          * first question, is the ifn we will emit on in our list, if so, we
2479          * want such an address. Note that we first looked for a preferred
2480          * address.
2481          */
2482         if (sctp_ifn) {
2483                 /* is a preferred one on the interface we route out? */
2484                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2485 #ifdef INET
2486                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2487                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2488                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2489                                 continue;
2490                         }
2491 #endif
2492 #ifdef INET6
2493                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2494                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2495                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2496                                 continue;
2497                         }
2498 #endif
2499                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2500                             (non_asoc_addr_ok == 0))
2501                                 continue;
2502                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2503                             dest_is_loop,
2504                             dest_is_priv, fam);
2505                         if (sifa == NULL)
2506                                 continue;
2507                         if (sctp_is_addr_in_ep(inp, sifa)) {
2508                                 atomic_add_int(&sifa->refcount, 1);
2509                                 return (sifa);
2510                         }
2511                 }
2512         }
2513         /*
2514          * ok, now we now need to find one on the list of the addresses. We
2515          * can't get one on the emitting interface so let's find first a
2516          * preferred one. If not that an acceptable one otherwise... we
2517          * return NULL.
2518          */
2519         starting_point = inp->next_addr_touse;
2520 once_again:
2521         if (inp->next_addr_touse == NULL) {
2522                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2523                 resettotop = 1;
2524         }
2525         for (laddr = inp->next_addr_touse; laddr;
2526             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2527                 if (laddr->ifa == NULL) {
2528                         /* address has been removed */
2529                         continue;
2530                 }
2531                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2532                         /* address is being deleted */
2533                         continue;
2534                 }
2535                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2536                     dest_is_priv, fam);
2537                 if (sifa == NULL)
2538                         continue;
2539                 atomic_add_int(&sifa->refcount, 1);
2540                 return (sifa);
2541         }
2542         if (resettotop == 0) {
2543                 inp->next_addr_touse = NULL;
2544                 goto once_again;
2545         }
2546         inp->next_addr_touse = starting_point;
2547         resettotop = 0;
2548 once_again_too:
2549         if (inp->next_addr_touse == NULL) {
2550                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2551                 resettotop = 1;
2552         }
2553         /* ok, what about an acceptable address in the inp */
2554         for (laddr = inp->next_addr_touse; laddr;
2555             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2556                 if (laddr->ifa == NULL) {
2557                         /* address has been removed */
2558                         continue;
2559                 }
2560                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2561                         /* address is being deleted */
2562                         continue;
2563                 }
2564                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2565                     dest_is_priv, fam);
2566                 if (sifa == NULL)
2567                         continue;
2568                 atomic_add_int(&sifa->refcount, 1);
2569                 return (sifa);
2570         }
2571         if (resettotop == 0) {
2572                 inp->next_addr_touse = NULL;
2573                 goto once_again_too;
2574         }
2575         /*
2576          * no address bound can be a source for the destination we are in
2577          * trouble
2578          */
2579         return (NULL);
2580 }
2581
2582
2583
2584 static struct sctp_ifa *
2585 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2586     struct sctp_tcb *stcb,
2587     sctp_route_t *ro,
2588     uint32_t vrf_id,
2589     uint8_t dest_is_priv,
2590     uint8_t dest_is_loop,
2591     int non_asoc_addr_ok,
2592     sa_family_t fam)
2593 {
2594         struct sctp_laddr *laddr, *starting_point;
2595         void *ifn;
2596         struct sctp_ifn *sctp_ifn;
2597         struct sctp_ifa *sctp_ifa, *sifa;
2598         uint8_t start_at_beginning = 0;
2599         struct sctp_vrf *vrf;
2600         uint32_t ifn_index;
2601
2602         /*
2603          * first question, is the ifn we will emit on in our list, if so, we
2604          * want that one.
2605          */
2606         vrf = sctp_find_vrf(vrf_id);
2607         if (vrf == NULL)
2608                 return (NULL);
2609
2610         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2611         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2612         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2613
2614         /*
2615          * first question, is the ifn we will emit on in our list?  If so,
2616          * we want that one. First we look for a preferred. Second, we go
2617          * for an acceptable.
2618          */
2619         if (sctp_ifn) {
2620                 /* first try for a preferred address on the ep */
2621                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2622 #ifdef INET
2623                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2624                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2625                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2626                                 continue;
2627                         }
2628 #endif
2629 #ifdef INET6
2630                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2631                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2632                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2633                                 continue;
2634                         }
2635 #endif
2636                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2637                                 continue;
2638                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2639                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2640                                 if (sifa == NULL)
2641                                         continue;
2642                                 if (((non_asoc_addr_ok == 0) &&
2643                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2644                                     (non_asoc_addr_ok &&
2645                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2646                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2647                                         /* on the no-no list */
2648                                         continue;
2649                                 }
2650                                 atomic_add_int(&sifa->refcount, 1);
2651                                 return (sifa);
2652                         }
2653                 }
2654                 /* next try for an acceptable address on the ep */
2655                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2656 #ifdef INET
2657                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2658                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2659                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2660                                 continue;
2661                         }
2662 #endif
2663 #ifdef INET6
2664                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2665                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2666                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2667                                 continue;
2668                         }
2669 #endif
2670                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2671                                 continue;
2672                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2673                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2674                                 if (sifa == NULL)
2675                                         continue;
2676                                 if (((non_asoc_addr_ok == 0) &&
2677                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2678                                     (non_asoc_addr_ok &&
2679                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2680                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2681                                         /* on the no-no list */
2682                                         continue;
2683                                 }
2684                                 atomic_add_int(&sifa->refcount, 1);
2685                                 return (sifa);
2686                         }
2687                 }
2688
2689         }
2690         /*
2691          * if we can't find one like that then we must look at all addresses
2692          * bound to pick one at first preferable then secondly acceptable.
2693          */
2694         starting_point = stcb->asoc.last_used_address;
2695 sctp_from_the_top:
2696         if (stcb->asoc.last_used_address == NULL) {
2697                 start_at_beginning = 1;
2698                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2699         }
2700         /* search beginning with the last used address */
2701         for (laddr = stcb->asoc.last_used_address; laddr;
2702             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2703                 if (laddr->ifa == NULL) {
2704                         /* address has been removed */
2705                         continue;
2706                 }
2707                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2708                         /* address is being deleted */
2709                         continue;
2710                 }
2711                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2712                 if (sifa == NULL)
2713                         continue;
2714                 if (((non_asoc_addr_ok == 0) &&
2715                     (sctp_is_addr_restricted(stcb, sifa))) ||
2716                     (non_asoc_addr_ok &&
2717                     (sctp_is_addr_restricted(stcb, sifa)) &&
2718                     (!sctp_is_addr_pending(stcb, sifa)))) {
2719                         /* on the no-no list */
2720                         continue;
2721                 }
2722                 stcb->asoc.last_used_address = laddr;
2723                 atomic_add_int(&sifa->refcount, 1);
2724                 return (sifa);
2725         }
2726         if (start_at_beginning == 0) {
2727                 stcb->asoc.last_used_address = NULL;
2728                 goto sctp_from_the_top;
2729         }
2730         /* now try for any higher scope than the destination */
2731         stcb->asoc.last_used_address = starting_point;
2732         start_at_beginning = 0;
2733 sctp_from_the_top2:
2734         if (stcb->asoc.last_used_address == NULL) {
2735                 start_at_beginning = 1;
2736                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2737         }
2738         /* search beginning with the last used address */
2739         for (laddr = stcb->asoc.last_used_address; laddr;
2740             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2741                 if (laddr->ifa == NULL) {
2742                         /* address has been removed */
2743                         continue;
2744                 }
2745                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2746                         /* address is being deleted */
2747                         continue;
2748                 }
2749                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2750                     dest_is_priv, fam);
2751                 if (sifa == NULL)
2752                         continue;
2753                 if (((non_asoc_addr_ok == 0) &&
2754                     (sctp_is_addr_restricted(stcb, sifa))) ||
2755                     (non_asoc_addr_ok &&
2756                     (sctp_is_addr_restricted(stcb, sifa)) &&
2757                     (!sctp_is_addr_pending(stcb, sifa)))) {
2758                         /* on the no-no list */
2759                         continue;
2760                 }
2761                 stcb->asoc.last_used_address = laddr;
2762                 atomic_add_int(&sifa->refcount, 1);
2763                 return (sifa);
2764         }
2765         if (start_at_beginning == 0) {
2766                 stcb->asoc.last_used_address = NULL;
2767                 goto sctp_from_the_top2;
2768         }
2769         return (NULL);
2770 }
2771
2772 static struct sctp_ifa *
2773 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2774     struct sctp_inpcb *inp,
2775     struct sctp_tcb *stcb,
2776     int non_asoc_addr_ok,
2777     uint8_t dest_is_loop,
2778     uint8_t dest_is_priv,
2779     int addr_wanted,
2780     sa_family_t fam,
2781     sctp_route_t *ro
2782 )
2783 {
2784         struct sctp_ifa *ifa, *sifa;
2785         int num_eligible_addr = 0;
2786 #ifdef INET6
2787         struct sockaddr_in6 sin6, lsa6;
2788
2789         if (fam == AF_INET6) {
2790                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2791                 (void)sa6_recoverscope(&sin6);
2792         }
2793 #endif                          /* INET6 */
2794         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2795 #ifdef INET
2796                 if ((ifa->address.sa.sa_family == AF_INET) &&
2797                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2798                     &ifa->address.sin.sin_addr) != 0)) {
2799                         continue;
2800                 }
2801 #endif
2802 #ifdef INET6
2803                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2804                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2805                     &ifa->address.sin6.sin6_addr) != 0)) {
2806                         continue;
2807                 }
2808 #endif
2809                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2810                     (non_asoc_addr_ok == 0))
2811                         continue;
2812                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2813                     dest_is_priv, fam);
2814                 if (sifa == NULL)
2815                         continue;
2816 #ifdef INET6
2817                 if (fam == AF_INET6 &&
2818                     dest_is_loop &&
2819                     sifa->src_is_loop && sifa->src_is_priv) {
2820                         /*
2821                          * don't allow fe80::1 to be a src on loop ::1, we
2822                          * don't list it to the peer so we will get an
2823                          * abort.
2824                          */
2825                         continue;
2826                 }
2827                 if (fam == AF_INET6 &&
2828                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2829                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2830                         /*
2831                          * link-local <-> link-local must belong to the same
2832                          * scope.
2833                          */
2834                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2835                         (void)sa6_recoverscope(&lsa6);
2836                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2837                                 continue;
2838                         }
2839                 }
2840 #endif                          /* INET6 */
2841
2842                 /*
2843                  * Check if the IPv6 address matches to next-hop. In the
2844                  * mobile case, old IPv6 address may be not deleted from the
2845                  * interface. Then, the interface has previous and new
2846                  * addresses.  We should use one corresponding to the
2847                  * next-hop.  (by micchie)
2848                  */
2849 #ifdef INET6
2850                 if (stcb && fam == AF_INET6 &&
2851                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2852                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2853                             == 0) {
2854                                 continue;
2855                         }
2856                 }
2857 #endif
2858 #ifdef INET
2859                 /* Avoid topologically incorrect IPv4 address */
2860                 if (stcb && fam == AF_INET &&
2861                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2862                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2863                                 continue;
2864                         }
2865                 }
2866 #endif
2867                 if (stcb) {
2868                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2869                                 continue;
2870                         }
2871                         if (((non_asoc_addr_ok == 0) &&
2872                             (sctp_is_addr_restricted(stcb, sifa))) ||
2873                             (non_asoc_addr_ok &&
2874                             (sctp_is_addr_restricted(stcb, sifa)) &&
2875                             (!sctp_is_addr_pending(stcb, sifa)))) {
2876                                 /*
2877                                  * It is restricted for some reason..
2878                                  * probably not yet added.
2879                                  */
2880                                 continue;
2881                         }
2882                 }
2883                 if (num_eligible_addr >= addr_wanted) {
2884                         return (sifa);
2885                 }
2886                 num_eligible_addr++;
2887         }
2888         return (NULL);
2889 }
2890
2891
2892 static int
2893 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2894     struct sctp_inpcb *inp,
2895     struct sctp_tcb *stcb,
2896     int non_asoc_addr_ok,
2897     uint8_t dest_is_loop,
2898     uint8_t dest_is_priv,
2899     sa_family_t fam)
2900 {
2901         struct sctp_ifa *ifa, *sifa;
2902         int num_eligible_addr = 0;
2903
2904         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2905 #ifdef INET
2906                 if ((ifa->address.sa.sa_family == AF_INET) &&
2907                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2908                     &ifa->address.sin.sin_addr) != 0)) {
2909                         continue;
2910                 }
2911 #endif
2912 #ifdef INET6
2913                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2914                     (stcb != NULL) &&
2915                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2916                     &ifa->address.sin6.sin6_addr) != 0)) {
2917                         continue;
2918                 }
2919 #endif
2920                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2921                     (non_asoc_addr_ok == 0)) {
2922                         continue;
2923                 }
2924                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2925                     dest_is_priv, fam);
2926                 if (sifa == NULL) {
2927                         continue;
2928                 }
2929                 if (stcb) {
2930                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2931                                 continue;
2932                         }
2933                         if (((non_asoc_addr_ok == 0) &&
2934                             (sctp_is_addr_restricted(stcb, sifa))) ||
2935                             (non_asoc_addr_ok &&
2936                             (sctp_is_addr_restricted(stcb, sifa)) &&
2937                             (!sctp_is_addr_pending(stcb, sifa)))) {
2938                                 /*
2939                                  * It is restricted for some reason..
2940                                  * probably not yet added.
2941                                  */
2942                                 continue;
2943                         }
2944                 }
2945                 num_eligible_addr++;
2946         }
2947         return (num_eligible_addr);
2948 }
2949
2950 static struct sctp_ifa *
2951 sctp_choose_boundall(struct sctp_inpcb *inp,
2952     struct sctp_tcb *stcb,
2953     struct sctp_nets *net,
2954     sctp_route_t *ro,
2955     uint32_t vrf_id,
2956     uint8_t dest_is_priv,
2957     uint8_t dest_is_loop,
2958     int non_asoc_addr_ok,
2959     sa_family_t fam)
2960 {
2961         int cur_addr_num = 0, num_preferred = 0;
2962         void *ifn;
2963         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2964         struct sctp_ifa *sctp_ifa, *sifa;
2965         uint32_t ifn_index;
2966         struct sctp_vrf *vrf;
2967 #ifdef INET
2968         int retried = 0;
2969 #endif
2970
2971         /*-
2972          * For boundall we can use any address in the association.
2973          * If non_asoc_addr_ok is set we can use any address (at least in
2974          * theory). So we look for preferred addresses first. If we find one,
2975          * we use it. Otherwise we next try to get an address on the
2976          * interface, which we should be able to do (unless non_asoc_addr_ok
2977          * is false and we are routed out that way). In these cases where we
2978          * can't use the address of the interface we go through all the
2979          * ifn's looking for an address we can use and fill that in. Punting
2980          * means we send back address 0, which will probably cause problems
2981          * actually since then IP will fill in the address of the route ifn,
2982          * which means we probably already rejected it.. i.e. here comes an
2983          * abort :-<.
2984          */
2985         vrf = sctp_find_vrf(vrf_id);
2986         if (vrf == NULL)
2987                 return (NULL);
2988
2989         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2990         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2991         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2992         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2993         if (sctp_ifn == NULL) {
2994                 /* ?? We don't have this guy ?? */
2995                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2996                 goto bound_all_plan_b;
2997         }
2998         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2999             ifn_index, sctp_ifn->ifn_name);
3000
3001         if (net) {
3002                 cur_addr_num = net->indx_of_eligible_next_to_use;
3003         }
3004         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3005             inp, stcb,
3006             non_asoc_addr_ok,
3007             dest_is_loop,
3008             dest_is_priv, fam);
3009         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3010             num_preferred, sctp_ifn->ifn_name);
3011         if (num_preferred == 0) {
3012                 /*
3013                  * no eligible addresses, we must use some other interface
3014                  * address if we can find one.
3015                  */
3016                 goto bound_all_plan_b;
3017         }
3018         /*
3019          * Ok we have num_eligible_addr set with how many we can use, this
3020          * may vary from call to call due to addresses being deprecated
3021          * etc..
3022          */
3023         if (cur_addr_num >= num_preferred) {
3024                 cur_addr_num = 0;
3025         }
3026         /*
3027          * select the nth address from the list (where cur_addr_num is the
3028          * nth) and 0 is the first one, 1 is the second one etc...
3029          */
3030         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3031
3032         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3033             dest_is_priv, cur_addr_num, fam, ro);
3034
3035         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3036         if (sctp_ifa) {
3037                 atomic_add_int(&sctp_ifa->refcount, 1);
3038                 if (net) {
3039                         /* save off where the next one we will want */
3040                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3041                 }
3042                 return (sctp_ifa);
3043         }
3044         /*
3045          * plan_b: Look at all interfaces and find a preferred address. If
3046          * no preferred fall through to plan_c.
3047          */
3048 bound_all_plan_b:
3049         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3050         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3051                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3052                     sctp_ifn->ifn_name);
3053                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054                         /* wrong base scope */
3055                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3056                         continue;
3057                 }
3058                 if ((sctp_ifn == looked_at) && looked_at) {
3059                         /* already looked at this guy */
3060                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3061                         continue;
3062                 }
3063                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3064                     dest_is_loop, dest_is_priv, fam);
3065                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3066                     "Found ifn:%p %d preferred source addresses\n",
3067                     ifn, num_preferred);
3068                 if (num_preferred == 0) {
3069                         /* None on this interface. */
3070                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3071                         continue;
3072                 }
3073                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3074                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3075                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3076
3077                 /*
3078                  * Ok we have num_eligible_addr set with how many we can
3079                  * use, this may vary from call to call due to addresses
3080                  * being deprecated etc..
3081                  */
3082                 if (cur_addr_num >= num_preferred) {
3083                         cur_addr_num = 0;
3084                 }
3085                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3086                     dest_is_priv, cur_addr_num, fam, ro);
3087                 if (sifa == NULL)
3088                         continue;
3089                 if (net) {
3090                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3091                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3092                             cur_addr_num);
3093                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3094                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3096                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3097                 }
3098                 atomic_add_int(&sifa->refcount, 1);
3099                 return (sifa);
3100         }
3101 #ifdef INET
3102 again_with_private_addresses_allowed:
3103 #endif
3104         /* plan_c: do we have an acceptable address on the emit interface */
3105         sifa = NULL;
3106         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3107         if (emit_ifn == NULL) {
3108                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3109                 goto plan_d;
3110         }
3111         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3113 #ifdef INET
3114                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3115                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3116                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3117                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3118                         continue;
3119                 }
3120 #endif
3121 #ifdef INET6
3122                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3123                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3124                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3125                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3126                         continue;
3127                 }
3128 #endif
3129                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3130                     (non_asoc_addr_ok == 0)) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3132                         continue;
3133                 }
3134                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3135                     dest_is_priv, fam);
3136                 if (sifa == NULL) {
3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3138                         continue;
3139                 }
3140                 if (stcb) {
3141                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3142                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3143                                 sifa = NULL;
3144                                 continue;
3145                         }
3146                         if (((non_asoc_addr_ok == 0) &&
3147                             (sctp_is_addr_restricted(stcb, sifa))) ||
3148                             (non_asoc_addr_ok &&
3149                             (sctp_is_addr_restricted(stcb, sifa)) &&
3150                             (!sctp_is_addr_pending(stcb, sifa)))) {
3151                                 /*
3152                                  * It is restricted for some reason..
3153                                  * probably not yet added.
3154                                  */
3155                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3156                                 sifa = NULL;
3157                                 continue;
3158                         }
3159                 }
3160                 atomic_add_int(&sifa->refcount, 1);
3161                 goto out;
3162         }
3163 plan_d:
3164         /*
3165          * plan_d: We are in trouble. No preferred address on the emit
3166          * interface. And not even a preferred address on all interfaces. Go
3167          * out and see if we can find an acceptable address somewhere
3168          * amongst all interfaces.
3169          */
3170         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3171         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3172                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3173                         /* wrong base scope */
3174                         continue;
3175                 }
3176                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3177 #ifdef INET
3178                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3179                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3180                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3181                                 continue;
3182                         }
3183 #endif
3184 #ifdef INET6
3185                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3186                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3187                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3188                                 continue;
3189                         }
3190 #endif
3191                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3192                             (non_asoc_addr_ok == 0))
3193                                 continue;
3194                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3195                             dest_is_loop,
3196                             dest_is_priv, fam);
3197                         if (sifa == NULL)
3198                                 continue;
3199                         if (stcb) {
3200                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3201                                         sifa = NULL;
3202                                         continue;
3203                                 }
3204                                 if (((non_asoc_addr_ok == 0) &&
3205                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3206                                     (non_asoc_addr_ok &&
3207                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3208                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3209                                         /*
3210                                          * It is restricted for some
3211                                          * reason.. probably not yet added.
3212                                          */
3213                                         sifa = NULL;
3214                                         continue;
3215                                 }
3216                         }
3217                         goto out;
3218                 }
3219         }
3220 #ifdef INET
3221         if (stcb) {
3222                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3223                         stcb->asoc.scope.ipv4_local_scope = 1;
3224                         retried = 1;
3225                         goto again_with_private_addresses_allowed;
3226                 } else if (retried == 1) {
3227                         stcb->asoc.scope.ipv4_local_scope = 0;
3228                 }
3229         }
3230 #endif
3231 out:
3232 #ifdef INET
3233         if (sifa) {
3234                 if (retried == 1) {
3235                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3236                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3237                                         /* wrong base scope */
3238                                         continue;
3239                                 }
3240                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3241                                         struct sctp_ifa *tmp_sifa;
3242
3243 #ifdef INET
3244                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3245                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3246                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3247                                                 continue;
3248                                         }
3249 #endif
3250 #ifdef INET6
3251                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3252                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3253                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3254                                                 continue;
3255                                         }
3256 #endif
3257                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3258                                             (non_asoc_addr_ok == 0))
3259                                                 continue;
3260                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3261                                             dest_is_loop,
3262                                             dest_is_priv, fam);
3263                                         if (tmp_sifa == NULL) {
3264                                                 continue;
3265                                         }
3266                                         if (tmp_sifa == sifa) {
3267                                                 continue;
3268                                         }
3269                                         if (stcb) {
3270                                                 if (sctp_is_address_in_scope(tmp_sifa,
3271                                                     &stcb->asoc.scope, 0) == 0) {
3272                                                         continue;
3273                                                 }
3274                                                 if (((non_asoc_addr_ok == 0) &&
3275                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3276                                                     (non_asoc_addr_ok &&
3277                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3278                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3279                                                         /*
3280                                                          * It is restricted
3281                                                          * for some reason..
3282                                                          * probably not yet
3283                                                          * added.
3284                                                          */
3285                                                         continue;
3286                                                 }
3287                                         }
3288                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3289                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3290                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3291                                         }
3292                                 }
3293                         }
3294                 }
3295                 atomic_add_int(&sifa->refcount, 1);
3296         }
3297 #endif
3298         return (sifa);
3299 }
3300
3301
3302
3303 /* tcb may be NULL */
3304 struct sctp_ifa *
3305 sctp_source_address_selection(struct sctp_inpcb *inp,
3306     struct sctp_tcb *stcb,
3307     sctp_route_t *ro,
3308     struct sctp_nets *net,
3309     int non_asoc_addr_ok, uint32_t vrf_id)
3310 {
3311         struct sctp_ifa *answer;
3312         uint8_t dest_is_priv, dest_is_loop;
3313         sa_family_t fam;
3314 #ifdef INET
3315         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3316 #endif
3317 #ifdef INET6
3318         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3319 #endif
3320
3321         /**
3322          * Rules:
3323          * - Find the route if needed, cache if I can.
3324          * - Look at interface address in route, Is it in the bound list. If so we
3325          *   have the best source.
3326          * - If not we must rotate amongst the addresses.
3327          *
3328          * Cavets and issues
3329          *
3330          * Do we need to pay attention to scope. We can have a private address
3331          * or a global address we are sourcing or sending to. So if we draw
3332          * it out
3333          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3334          * For V4
3335          * ------------------------------------------
3336          *      source     *      dest  *  result
3337          * -----------------------------------------
3338          * <a>  Private    *    Global  *  NAT
3339          * -----------------------------------------
3340          * <b>  Private    *    Private *  No problem
3341          * -----------------------------------------
3342          * <c>  Global     *    Private *  Huh, How will this work?
3343          * -----------------------------------------
3344          * <d>  Global     *    Global  *  No Problem
3345          *------------------------------------------
3346          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3347          * For V6
3348          *------------------------------------------
3349          *      source     *      dest  *  result
3350          * -----------------------------------------
3351          * <a>  Linklocal  *    Global  *
3352          * -----------------------------------------
3353          * <b>  Linklocal  * Linklocal  *  No problem
3354          * -----------------------------------------
3355          * <c>  Global     * Linklocal  *  Huh, How will this work?
3356          * -----------------------------------------
3357          * <d>  Global     *    Global  *  No Problem
3358          *------------------------------------------
3359          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3360          *
3361          * And then we add to that what happens if there are multiple addresses
3362          * assigned to an interface. Remember the ifa on a ifn is a linked
3363          * list of addresses. So one interface can have more than one IP
3364          * address. What happens if we have both a private and a global
3365          * address? Do we then use context of destination to sort out which
3366          * one is best? And what about NAT's sending P->G may get you a NAT
3367          * translation, or should you select the G thats on the interface in
3368          * preference.
3369          *
3370          * Decisions:
3371          *
3372          * - count the number of addresses on the interface.
3373          * - if it is one, no problem except case <c>.
3374          *   For <a> we will assume a NAT out there.
3375          * - if there are more than one, then we need to worry about scope P
3376          *   or G. We should prefer G -> G and P -> P if possible.
3377          *   Then as a secondary fall back to mixed types G->P being a last
3378          *   ditch one.
3379          * - The above all works for bound all, but bound specific we need to
3380          *   use the same concept but instead only consider the bound
3381          *   addresses. If the bound set is NOT assigned to the interface then
3382          *   we must use rotation amongst the bound addresses..
3383          */
3384         if (ro->ro_rt == NULL) {
3385                 /*
3386                  * Need a route to cache.
3387                  */
3388                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3389         }
3390         if (ro->ro_rt == NULL) {
3391                 return (NULL);
3392         }
3393         fam = ro->ro_dst.sa_family;
3394         dest_is_priv = dest_is_loop = 0;
3395         /* Setup our scopes for the destination */
3396         switch (fam) {
3397 #ifdef INET
3398         case AF_INET:
3399                 /* Scope based on outbound address */
3400                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3401                         dest_is_loop = 1;
3402                         if (net != NULL) {
3403                                 /* mark it as local */
3404                                 net->addr_is_local = 1;
3405                         }
3406                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3407                         dest_is_priv = 1;
3408                 }
3409                 break;
3410 #endif
3411 #ifdef INET6
3412         case AF_INET6:
3413                 /* Scope based on outbound address */
3414                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3415                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3416                         /*
3417                          * If the address is a loopback address, which
3418                          * consists of "::1" OR "fe80::1%lo0", we are
3419                          * loopback scope. But we don't use dest_is_priv
3420                          * (link local addresses).
3421                          */
3422                         dest_is_loop = 1;
3423                         if (net != NULL) {
3424                                 /* mark it as local */
3425                                 net->addr_is_local = 1;
3426                         }
3427                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3428                         dest_is_priv = 1;
3429                 }
3430                 break;
3431 #endif
3432         }
3433         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3434         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3435         SCTP_IPI_ADDR_RLOCK();
3436         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3437                 /*
3438                  * Bound all case
3439                  */
3440                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3441                     dest_is_priv, dest_is_loop,
3442                     non_asoc_addr_ok, fam);
3443                 SCTP_IPI_ADDR_RUNLOCK();
3444                 return (answer);
3445         }
3446         /*
3447          * Subset bound case
3448          */
3449         if (stcb) {
3450                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3451                     vrf_id, dest_is_priv,
3452                     dest_is_loop,
3453                     non_asoc_addr_ok, fam);
3454         } else {
3455                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3456                     non_asoc_addr_ok,
3457                     dest_is_priv,
3458                     dest_is_loop, fam);
3459         }
3460         SCTP_IPI_ADDR_RUNLOCK();
3461         return (answer);
3462 }
3463
3464 static int
3465 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3466 {
3467         struct cmsghdr cmh;
3468         struct sctp_sndinfo sndinfo;
3469         struct sctp_prinfo prinfo;
3470         struct sctp_authinfo authinfo;
3471         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3472         int found;
3473
3474         /*
3475          * Independent of how many mbufs, find the c_type inside the control
3476          * structure and copy out the data.
3477          */
3478         found = 0;
3479         tot_len = SCTP_BUF_LEN(control);
3480         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3481                 rem_len = tot_len - off;
3482                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3483                         /* There is not enough room for one more. */
3484                         return (found);
3485                 }
3486                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3487                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3488                         /* We dont't have a complete CMSG header. */
3489                         return (found);
3490                 }
3491                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3492                         /* We don't have the complete CMSG. */
3493                         return (found);
3494                 }
3495                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3496                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3497                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3498                     ((c_type == cmh.cmsg_type) ||
3499                     ((c_type == SCTP_SNDRCV) &&
3500                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3501                     (cmh.cmsg_type == SCTP_PRINFO) ||
3502                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3503                         if (c_type == cmh.cmsg_type) {
3504                                 if (cpsize > INT_MAX) {
3505                                         return (found);
3506                                 }
3507                                 if (cmsg_data_len < (int)cpsize) {
3508                                         return (found);
3509                                 }
3510                                 /* It is exactly what we want. Copy it out. */
3511                                 m_copydata(control, cmsg_data_off, (int)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 (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3526                                                 return (found);
3527                                         }
3528                                         m_copydata(control, cmsg_data_off, 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 (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3537                                                 return (found);
3538                                         }
3539                                         m_copydata(control, cmsg_data_off, 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 (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3549                                                 return (found);
3550                                         }
3551                                         m_copydata(control, cmsg_data_off, 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         }
3562         return (found);
3563 }
3564
3565 static int
3566 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3567 {
3568         struct cmsghdr cmh;
3569         int tlen, at;
3570         struct sctp_initmsg initmsg;
3571 #ifdef INET
3572         struct sockaddr_in sin;
3573 #endif
3574 #ifdef INET6
3575         struct sockaddr_in6 sin6;
3576 #endif
3577
3578         tlen = SCTP_BUF_LEN(control);
3579         at = 0;
3580         while (at < tlen) {
3581                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3582                         /* There is not enough room for one more. */
3583                         *error = EINVAL;
3584                         return (1);
3585                 }
3586                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3587                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3588                         /* We dont't have a complete CMSG header. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 if (((int)cmh.cmsg_len + at) > tlen) {
3593                         /* We don't have the complete CMSG. */
3594                         *error = EINVAL;
3595                         return (1);
3596                 }
3597                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3598                         switch (cmh.cmsg_type) {
3599                         case SCTP_INIT:
3600                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3601                                         *error = EINVAL;
3602                                         return (1);
3603                                 }
3604                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3605                                 if (initmsg.sinit_max_attempts)
3606                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3607                                 if (initmsg.sinit_num_ostreams)
3608                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3609                                 if (initmsg.sinit_max_instreams)
3610                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3611                                 if (initmsg.sinit_max_init_timeo)
3612                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3613                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3614                                         struct sctp_stream_out *tmp_str;
3615                                         unsigned int i;
3616 #if defined(SCTP_DETAILED_STR_STATS)
3617                                         int j;
3618 #endif
3619
3620                                         /* Default is NOT correct */
3621                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3622                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3623                                         SCTP_TCB_UNLOCK(stcb);
3624                                         SCTP_MALLOC(tmp_str,
3625                                             struct sctp_stream_out *,
3626                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3627                                             SCTP_M_STRMO);
3628                                         SCTP_TCB_LOCK(stcb);
3629                                         if (tmp_str != NULL) {
3630                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3631                                                 stcb->asoc.strmout = tmp_str;
3632                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3633                                         } else {
3634                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3635                                         }
3636                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3637                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3638                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3639                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3640                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3641 #if defined(SCTP_DETAILED_STR_STATS)
3642                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3643                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3644                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3645                                                 }
3646 #else
3647                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3648                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3649 #endif
3650                                                 stcb->asoc.strmout[i].sid = i;
3651                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3652                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3653                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3654                                         }
3655                                 }
3656                                 break;
3657 #ifdef INET
3658                         case SCTP_DSTADDRV4:
3659                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3660                                         *error = EINVAL;
3661                                         return (1);
3662                                 }
3663                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3664                                 sin.sin_family = AF_INET;
3665                                 sin.sin_len = sizeof(struct sockaddr_in);
3666                                 sin.sin_port = stcb->rport;
3667                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3668                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3669                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3670                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3671                                         *error = EINVAL;
3672                                         return (1);
3673                                 }
3674                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3675                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3676                                         *error = ENOBUFS;
3677                                         return (1);
3678                                 }
3679                                 break;
3680 #endif
3681 #ifdef INET6
3682                         case SCTP_DSTADDRV6:
3683                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3684                                         *error = EINVAL;
3685                                         return (1);
3686                                 }
3687                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3688                                 sin6.sin6_family = AF_INET6;
3689                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3690                                 sin6.sin6_port = stcb->rport;
3691                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3692                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3693                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3694                                         *error = EINVAL;
3695                                         return (1);
3696                                 }
3697 #ifdef INET
3698                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3699                                         in6_sin6_2_sin(&sin, &sin6);
3700                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3701                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3702                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3703                                                 *error = EINVAL;
3704                                                 return (1);
3705                                         }
3706                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3707                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3708                                                 *error = ENOBUFS;
3709                                                 return (1);
3710                                         }
3711                                 } else
3712 #endif
3713                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3714                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3715                                         *error = ENOBUFS;
3716                                         return (1);
3717                                 }
3718                                 break;
3719 #endif
3720                         default:
3721                                 break;
3722                         }
3723                 }
3724                 at += CMSG_ALIGN(cmh.cmsg_len);
3725         }
3726         return (0);
3727 }
3728
3729 static struct sctp_tcb *
3730 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3731     uint16_t port,
3732     struct mbuf *control,
3733     struct sctp_nets **net_p,
3734     int *error)
3735 {
3736         struct cmsghdr cmh;
3737         int tlen, at;
3738         struct sctp_tcb *stcb;
3739         struct sockaddr *addr;
3740 #ifdef INET
3741         struct sockaddr_in sin;
3742 #endif
3743 #ifdef INET6
3744         struct sockaddr_in6 sin6;
3745 #endif
3746
3747         tlen = SCTP_BUF_LEN(control);
3748         at = 0;
3749         while (at < tlen) {
3750                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3751                         /* There is not enough room for one more. */
3752                         *error = EINVAL;
3753                         return (NULL);
3754                 }
3755                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3756                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3757                         /* We dont't have a complete CMSG header. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 if (((int)cmh.cmsg_len + at) > tlen) {
3762                         /* We don't have the complete CMSG. */
3763                         *error = EINVAL;
3764                         return (NULL);
3765                 }
3766                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3767                         switch (cmh.cmsg_type) {
3768 #ifdef INET
3769                         case SCTP_DSTADDRV4:
3770                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3771                                         *error = EINVAL;
3772                                         return (NULL);
3773                                 }
3774                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3775                                 sin.sin_family = AF_INET;
3776                                 sin.sin_len = sizeof(struct sockaddr_in);
3777                                 sin.sin_port = port;
3778                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3779                                 addr = (struct sockaddr *)&sin;
3780                                 break;
3781 #endif
3782 #ifdef INET6
3783                         case SCTP_DSTADDRV6:
3784                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3785                                         *error = EINVAL;
3786                                         return (NULL);
3787                                 }
3788                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3789                                 sin6.sin6_family = AF_INET6;
3790                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3791                                 sin6.sin6_port = port;
3792                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3793 #ifdef INET
3794                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3795                                         in6_sin6_2_sin(&sin, &sin6);
3796                                         addr = (struct sockaddr *)&sin;
3797                                 } else
3798 #endif
3799                                         addr = (struct sockaddr *)&sin6;
3800                                 break;
3801 #endif
3802                         default:
3803                                 addr = NULL;
3804                                 break;
3805                         }
3806                         if (addr) {
3807                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3808                                 if (stcb != NULL) {
3809                                         return (stcb);
3810                                 }
3811                         }
3812                 }
3813                 at += CMSG_ALIGN(cmh.cmsg_len);
3814         }
3815         return (NULL);
3816 }
3817
3818 static struct mbuf *
3819 sctp_add_cookie(struct mbuf *init, int init_offset,
3820     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3821 {
3822         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3823         struct sctp_state_cookie *stc;
3824         struct sctp_paramhdr *ph;
3825         uint8_t *foo;
3826         int sig_offset;
3827         uint16_t cookie_sz;
3828
3829         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3830             sizeof(struct sctp_paramhdr)), 0,
3831             M_NOWAIT, 1, MT_DATA);
3832         if (mret == NULL) {
3833                 return (NULL);
3834         }
3835         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3836         if (copy_init == NULL) {
3837                 sctp_m_freem(mret);
3838                 return (NULL);
3839         }
3840 #ifdef SCTP_MBUF_LOGGING
3841         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3842                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3843         }
3844 #endif
3845         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3846             M_NOWAIT);
3847         if (copy_initack == NULL) {
3848                 sctp_m_freem(mret);
3849                 sctp_m_freem(copy_init);
3850                 return (NULL);
3851         }
3852 #ifdef SCTP_MBUF_LOGGING
3853         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3854                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3855         }
3856 #endif
3857         /* easy side we just drop it on the end */
3858         ph = mtod(mret, struct sctp_paramhdr *);
3859         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3860             sizeof(struct sctp_paramhdr);
3861         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3862             sizeof(struct sctp_paramhdr));
3863         ph->param_type = htons(SCTP_STATE_COOKIE);
3864         ph->param_length = 0;   /* fill in at the end */
3865         /* Fill in the stc cookie data */
3866         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3867
3868         /* tack the INIT and then the INIT-ACK onto the chain */
3869         cookie_sz = 0;
3870         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3871                 cookie_sz += SCTP_BUF_LEN(m_at);
3872                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3873                         SCTP_BUF_NEXT(m_at) = copy_init;
3874                         break;
3875                 }
3876         }
3877         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3878                 cookie_sz += SCTP_BUF_LEN(m_at);
3879                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3880                         SCTP_BUF_NEXT(m_at) = copy_initack;
3881                         break;
3882                 }
3883         }
3884         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3885                 cookie_sz += SCTP_BUF_LEN(m_at);
3886                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3887                         break;
3888                 }
3889         }
3890         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3891         if (sig == NULL) {
3892                 /* no space, so free the entire chain */
3893                 sctp_m_freem(mret);
3894                 return (NULL);
3895         }
3896         SCTP_BUF_LEN(sig) = 0;
3897         SCTP_BUF_NEXT(m_at) = sig;
3898         sig_offset = 0;
3899         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3900         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3901         *signature = foo;
3902         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3903         cookie_sz += SCTP_SIGNATURE_SIZE;
3904         ph->param_length = htons(cookie_sz);
3905         return (mret);
3906 }
3907
3908
3909 static uint8_t
3910 sctp_get_ect(struct sctp_tcb *stcb)
3911 {
3912         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3913                 return (SCTP_ECT0_BIT);
3914         } else {
3915                 return (0);
3916         }
3917 }
3918
3919 #if defined(INET) || defined(INET6)
3920 static void
3921 sctp_handle_no_route(struct sctp_tcb *stcb,
3922     struct sctp_nets *net,
3923     int so_locked)
3924 {
3925         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3926
3927         if (net) {
3928                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3929                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3930                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3931                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3932                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3933                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3934                                     stcb, 0,
3935                                     (void *)net,
3936                                     so_locked);
3937                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3938                                 net->dest_state &= ~SCTP_ADDR_PF;
3939                         }
3940                 }
3941                 if (stcb) {
3942                         if (net == stcb->asoc.primary_destination) {
3943                                 /* need a new primary */
3944                                 struct sctp_nets *alt;
3945
3946                                 alt = sctp_find_alternate_net(stcb, net, 0);
3947                                 if (alt != net) {
3948                                         if (stcb->asoc.alternate) {
3949                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3950                                         }
3951                                         stcb->asoc.alternate = alt;
3952                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3953                                         if (net->ro._s_addr) {
3954                                                 sctp_free_ifa(net->ro._s_addr);
3955                                                 net->ro._s_addr = NULL;
3956                                         }
3957                                         net->src_addr_selected = 0;
3958                                 }
3959                         }
3960                 }
3961         }
3962 }
3963 #endif
3964
3965 static int
3966 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3967     struct sctp_tcb *stcb,      /* may be NULL */
3968     struct sctp_nets *net,
3969     struct sockaddr *to,
3970     struct mbuf *m,
3971     uint32_t auth_offset,
3972     struct sctp_auth_chunk *auth,
3973     uint16_t auth_keyid,
3974     int nofragment_flag,
3975     int ecn_ok,
3976     int out_of_asoc_ok,
3977     uint16_t src_port,
3978     uint16_t dest_port,
3979     uint32_t v_tag,
3980     uint16_t port,
3981     union sctp_sockstore *over_addr,
3982     uint8_t mflowtype, uint32_t mflowid,
3983 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3984     int so_locked SCTP_UNUSED
3985 #else
3986     int so_locked
3987 #endif
3988 )
3989 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3990 {
3991         /**
3992          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3993          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3994          * - fill in the HMAC digest of any AUTH chunk in the packet.
3995          * - calculate and fill in the SCTP checksum.
3996          * - prepend an IP address header.
3997          * - if boundall use INADDR_ANY.
3998          * - if boundspecific do source address selection.
3999          * - set fragmentation option for ipV4.
4000          * - On return from IP output, check/adjust mtu size of output
4001          *   interface and smallest_mtu size as well.
4002          */
4003         /* Will need ifdefs around this */
4004         struct mbuf *newm;
4005         struct sctphdr *sctphdr;
4006         int packet_length;
4007         int ret;
4008 #if defined(INET) || defined(INET6)
4009         uint32_t vrf_id;
4010 #endif
4011 #if defined(INET) || defined(INET6)
4012         struct mbuf *o_pak;
4013         sctp_route_t *ro = NULL;
4014         struct udphdr *udp = NULL;
4015 #endif
4016         uint8_t tos_value;
4017 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4018         struct socket *so = NULL;
4019 #endif
4020
4021         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4022                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4023                 sctp_m_freem(m);
4024                 return (EFAULT);
4025         }
4026 #if defined(INET) || defined(INET6)
4027         if (stcb) {
4028                 vrf_id = stcb->asoc.vrf_id;
4029         } else {
4030                 vrf_id = inp->def_vrf_id;
4031         }
4032 #endif
4033         /* fill in the HMAC digest for any AUTH chunk in the packet */
4034         if ((auth != NULL) && (stcb != NULL)) {
4035                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4036         }
4037         if (net) {
4038                 tos_value = net->dscp;
4039         } else if (stcb) {
4040                 tos_value = stcb->asoc.default_dscp;
4041         } else {
4042                 tos_value = inp->sctp_ep.default_dscp;
4043         }
4044
4045         switch (to->sa_family) {
4046 #ifdef INET
4047         case AF_INET:
4048                 {
4049                         struct ip *ip = NULL;
4050                         sctp_route_t iproute;
4051                         int len;
4052
4053                         len = SCTP_MIN_V4_OVERHEAD;
4054                         if (port) {
4055                                 len += sizeof(struct udphdr);
4056                         }
4057                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4058                         if (newm == NULL) {
4059                                 sctp_m_freem(m);
4060                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4061                                 return (ENOMEM);
4062                         }
4063                         SCTP_ALIGN_TO_END(newm, len);
4064                         SCTP_BUF_LEN(newm) = len;
4065                         SCTP_BUF_NEXT(newm) = m;
4066                         m = newm;
4067                         if (net != NULL) {
4068                                 m->m_pkthdr.flowid = net->flowid;
4069                                 M_HASHTYPE_SET(m, net->flowtype);
4070                         } else {
4071                                 m->m_pkthdr.flowid = mflowid;
4072                                 M_HASHTYPE_SET(m, mflowtype);
4073                         }
4074                         packet_length = sctp_calculate_len(m);
4075                         ip = mtod(m, struct ip *);
4076                         ip->ip_v = IPVERSION;
4077                         ip->ip_hl = (sizeof(struct ip) >> 2);
4078                         if (tos_value == 0) {
4079                                 /*
4080                                  * This means especially, that it is not set
4081                                  * at the SCTP layer. So use the value from
4082                                  * the IP layer.
4083                                  */
4084                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4085                         }
4086                         tos_value &= 0xfc;
4087                         if (ecn_ok) {
4088                                 tos_value |= sctp_get_ect(stcb);
4089                         }
4090                         if ((nofragment_flag) && (port == 0)) {
4091                                 ip->ip_off = htons(IP_DF);
4092                         } else {
4093                                 ip->ip_off = htons(0);
4094                         }
4095                         /* FreeBSD has a function for ip_id's */
4096                         ip_fillid(ip);
4097
4098                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4099                         ip->ip_len = htons(packet_length);
4100                         ip->ip_tos = tos_value;
4101                         if (port) {
4102                                 ip->ip_p = IPPROTO_UDP;
4103                         } else {
4104                                 ip->ip_p = IPPROTO_SCTP;
4105                         }
4106                         ip->ip_sum = 0;
4107                         if (net == NULL) {
4108                                 ro = &iproute;
4109                                 memset(&iproute, 0, sizeof(iproute));
4110                                 memcpy(&ro->ro_dst, to, to->sa_len);
4111                         } else {
4112                                 ro = (sctp_route_t *)&net->ro;
4113                         }
4114                         /* Now the address selection part */
4115                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4116
4117                         /* call the routine to select the src address */
4118                         if (net && out_of_asoc_ok == 0) {
4119                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4120                                         sctp_free_ifa(net->ro._s_addr);
4121                                         net->ro._s_addr = NULL;
4122                                         net->src_addr_selected = 0;
4123                                         if (ro->ro_rt) {
4124                                                 RTFREE(ro->ro_rt);
4125                                                 ro->ro_rt = NULL;
4126                                         }
4127                                 }
4128                                 if (net->src_addr_selected == 0) {
4129                                         /* Cache the source address */
4130                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4131                                             ro, net, 0,
4132                                             vrf_id);
4133                                         net->src_addr_selected = 1;
4134                                 }
4135                                 if (net->ro._s_addr == NULL) {
4136                                         /* No route to host */
4137                                         net->src_addr_selected = 0;
4138                                         sctp_handle_no_route(stcb, net, so_locked);
4139                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4140                                         sctp_m_freem(m);
4141                                         return (EHOSTUNREACH);
4142                                 }
4143                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4144                         } else {
4145                                 if (over_addr == NULL) {
4146                                         struct sctp_ifa *_lsrc;
4147
4148                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4149                                             net,
4150                                             out_of_asoc_ok,
4151                                             vrf_id);
4152                                         if (_lsrc == NULL) {
4153                                                 sctp_handle_no_route(stcb, net, so_locked);
4154                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4155                                                 sctp_m_freem(m);
4156                                                 return (EHOSTUNREACH);
4157                                         }
4158                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4159                                         sctp_free_ifa(_lsrc);
4160                                 } else {
4161                                         ip->ip_src = over_addr->sin.sin_addr;
4162                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4163                                 }
4164                         }
4165                         if (port) {
4166                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
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                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4173                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4174                                 udp->uh_dport = port;
4175                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4176                                 if (V_udp_cksum) {
4177                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4178                                 } else {
4179                                         udp->uh_sum = 0;
4180                                 }
4181                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4182                         } else {
4183                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4184                         }
4185
4186                         sctphdr->src_port = src_port;
4187                         sctphdr->dest_port = dest_port;
4188                         sctphdr->v_tag = v_tag;
4189                         sctphdr->checksum = 0;
4190
4191                         /*
4192                          * If source address selection fails and we find no
4193                          * route then the ip_output should fail as well with
4194                          * a NO_ROUTE_TO_HOST type error. We probably should
4195                          * catch that somewhere and abort the association
4196                          * right away (assuming this is an INIT being sent).
4197                          */
4198                         if (ro->ro_rt == NULL) {
4199                                 /*
4200                                  * src addr selection failed to find a route
4201                                  * (or valid source addr), so we can't get
4202                                  * there from here (yet)!
4203                                  */
4204                                 sctp_handle_no_route(stcb, net, so_locked);
4205                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4206                                 sctp_m_freem(m);
4207                                 return (EHOSTUNREACH);
4208                         }
4209                         if (ro != &iproute) {
4210                                 memcpy(&iproute, ro, sizeof(*ro));
4211                         }
4212                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4213                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4214                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4215                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4216                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4217                             (void *)ro->ro_rt);
4218
4219                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4220                                 /* failed to prepend data, give up */
4221                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4222                                 sctp_m_freem(m);
4223                                 return (ENOMEM);
4224                         }
4225                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4226                         if (port) {
4227 #if defined(SCTP_WITH_NO_CSUM)
4228                                 SCTP_STAT_INCR(sctps_sendnocrc);
4229 #else
4230                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4231                                 SCTP_STAT_INCR(sctps_sendswcrc);
4232 #endif
4233                                 if (V_udp_cksum) {
4234                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4235                                 }
4236                         } else {
4237 #if defined(SCTP_WITH_NO_CSUM)
4238                                 SCTP_STAT_INCR(sctps_sendnocrc);
4239 #else
4240                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4241                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4242                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4243 #endif
4244                         }
4245 #ifdef SCTP_PACKET_LOGGING
4246                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4247                                 sctp_packet_log(o_pak);
4248 #endif
4249                         /* send it out.  table id is taken from stcb */
4250 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4251                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4252                                 so = SCTP_INP_SO(inp);
4253                                 SCTP_SOCKET_UNLOCK(so, 0);
4254                         }
4255 #endif
4256                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4258                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4259                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4260                                 SCTP_TCB_UNLOCK(stcb);
4261                                 SCTP_SOCKET_LOCK(so, 0);
4262                                 SCTP_TCB_LOCK(stcb);
4263                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4264                         }
4265 #endif
4266                         SCTP_STAT_INCR(sctps_sendpackets);
4267                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4268                         if (ret)
4269                                 SCTP_STAT_INCR(sctps_senderrors);
4270
4271                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4272                         if (net == NULL) {
4273                                 /* free tempy routes */
4274                                 RO_RTFREE(ro);
4275                         } else {
4276                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4277                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4278                                         uint32_t mtu;
4279
4280                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4281                                         if (mtu > 0) {
4282                                                 if (net->port) {
4283                                                         mtu -= sizeof(struct udphdr);
4284                                                 }
4285                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4286                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4287                                                 }
4288                                                 net->mtu = mtu;
4289                                         }
4290                                 } else if (ro->ro_rt == NULL) {
4291                                         /* route was freed */
4292                                         if (net->ro._s_addr &&
4293                                             net->src_addr_selected) {
4294                                                 sctp_free_ifa(net->ro._s_addr);
4295                                                 net->ro._s_addr = NULL;
4296                                         }
4297                                         net->src_addr_selected = 0;
4298                                 }
4299                         }
4300                         return (ret);
4301                 }
4302 #endif
4303 #ifdef INET6
4304         case AF_INET6:
4305                 {
4306                         uint32_t flowlabel, flowinfo;
4307                         struct ip6_hdr *ip6h;
4308                         struct route_in6 ip6route;
4309                         struct ifnet *ifp;
4310                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4311                         int prev_scope = 0;
4312                         struct sockaddr_in6 lsa6_storage;
4313                         int error;
4314                         u_short prev_port = 0;
4315                         int len;
4316
4317                         if (net) {
4318                                 flowlabel = net->flowlabel;
4319                         } else if (stcb) {
4320                                 flowlabel = stcb->asoc.default_flowlabel;
4321                         } else {
4322                                 flowlabel = inp->sctp_ep.default_flowlabel;
4323                         }
4324                         if (flowlabel == 0) {
4325                                 /*
4326                                  * This means especially, that it is not set
4327                                  * at the SCTP layer. So use the value from
4328                                  * the IP layer.
4329                                  */
4330                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4331                         }
4332                         flowlabel &= 0x000fffff;
4333                         len = SCTP_MIN_OVERHEAD;
4334                         if (port) {
4335                                 len += sizeof(struct udphdr);
4336                         }
4337                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4338                         if (newm == NULL) {
4339                                 sctp_m_freem(m);
4340                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4341                                 return (ENOMEM);
4342                         }
4343                         SCTP_ALIGN_TO_END(newm, len);
4344                         SCTP_BUF_LEN(newm) = len;
4345                         SCTP_BUF_NEXT(newm) = m;
4346                         m = newm;
4347                         if (net != NULL) {
4348                                 m->m_pkthdr.flowid = net->flowid;
4349                                 M_HASHTYPE_SET(m, net->flowtype);
4350                         } else {
4351                                 m->m_pkthdr.flowid = mflowid;
4352                                 M_HASHTYPE_SET(m, mflowtype);
4353                         }
4354                         packet_length = sctp_calculate_len(m);
4355
4356                         ip6h = mtod(m, struct ip6_hdr *);
4357                         /* protect *sin6 from overwrite */
4358                         sin6 = (struct sockaddr_in6 *)to;
4359                         tmp = *sin6;
4360                         sin6 = &tmp;
4361
4362                         /* KAME hack: embed scopeid */
4363                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4364                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4365                                 return (EINVAL);
4366                         }
4367                         if (net == NULL) {
4368                                 memset(&ip6route, 0, sizeof(ip6route));
4369                                 ro = (sctp_route_t *)&ip6route;
4370                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4371                         } else {
4372                                 ro = (sctp_route_t *)&net->ro;
4373                         }
4374                         /*
4375                          * We assume here that inp_flow is in host byte
4376                          * order within the TCB!
4377                          */
4378                         if (tos_value == 0) {
4379                                 /*
4380                                  * This means especially, that it is not set
4381                                  * at the SCTP layer. So use the value from
4382                                  * the IP layer.
4383                                  */
4384                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4385                         }
4386                         tos_value &= 0xfc;
4387                         if (ecn_ok) {
4388                                 tos_value |= sctp_get_ect(stcb);
4389                         }
4390                         flowinfo = 0x06;
4391                         flowinfo <<= 8;
4392                         flowinfo |= tos_value;
4393                         flowinfo <<= 20;
4394                         flowinfo |= flowlabel;
4395                         ip6h->ip6_flow = htonl(flowinfo);
4396                         if (port) {
4397                                 ip6h->ip6_nxt = IPPROTO_UDP;
4398                         } else {
4399                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4400                         }
4401                         ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4402                         ip6h->ip6_dst = sin6->sin6_addr;
4403
4404                         /*
4405                          * Add SRC address selection here: we can only reuse
4406                          * to a limited degree the kame src-addr-sel, since
4407                          * we can try their selection but it may not be
4408                          * bound.
4409                          */
4410                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4411                         lsa6_tmp.sin6_family = AF_INET6;
4412                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4413                         lsa6 = &lsa6_tmp;
4414                         if (net && out_of_asoc_ok == 0) {
4415                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4416                                         sctp_free_ifa(net->ro._s_addr);
4417                                         net->ro._s_addr = NULL;
4418                                         net->src_addr_selected = 0;
4419                                         if (ro->ro_rt) {
4420                                                 RTFREE(ro->ro_rt);
4421                                                 ro->ro_rt = NULL;
4422                                         }
4423                                 }
4424                                 if (net->src_addr_selected == 0) {
4425                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4426                                         /* KAME hack: embed scopeid */
4427                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4428                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4429                                                 return (EINVAL);
4430                                         }
4431                                         /* Cache the source address */
4432                                         net->ro._s_addr = sctp_source_address_selection(inp,
4433                                             stcb,
4434                                             ro,
4435                                             net,
4436                                             0,
4437                                             vrf_id);
4438                                         (void)sa6_recoverscope(sin6);
4439                                         net->src_addr_selected = 1;
4440                                 }
4441                                 if (net->ro._s_addr == NULL) {
4442                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4443                                         net->src_addr_selected = 0;
4444                                         sctp_handle_no_route(stcb, net, so_locked);
4445                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4446                                         sctp_m_freem(m);
4447                                         return (EHOSTUNREACH);
4448                                 }
4449                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4450                         } else {
4451                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4452                                 /* KAME hack: embed scopeid */
4453                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4454                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4455                                         return (EINVAL);
4456                                 }
4457                                 if (over_addr == NULL) {
4458                                         struct sctp_ifa *_lsrc;
4459
4460                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4461                                             net,
4462                                             out_of_asoc_ok,
4463                                             vrf_id);
4464                                         if (_lsrc == NULL) {
4465                                                 sctp_handle_no_route(stcb, net, so_locked);
4466                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4467                                                 sctp_m_freem(m);
4468                                                 return (EHOSTUNREACH);
4469                                         }
4470                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4471                                         sctp_free_ifa(_lsrc);
4472                                 } else {
4473                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4474                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4475                                 }
4476                                 (void)sa6_recoverscope(sin6);
4477                         }
4478                         lsa6->sin6_port = inp->sctp_lport;
4479
4480                         if (ro->ro_rt == NULL) {
4481                                 /*
4482                                  * src addr selection failed to find a route
4483                                  * (or valid source addr), so we can't get
4484                                  * there from here!
4485                                  */
4486                                 sctp_handle_no_route(stcb, net, so_locked);
4487                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4488                                 sctp_m_freem(m);
4489                                 return (EHOSTUNREACH);
4490                         }
4491                         /*
4492                          * XXX: sa6 may not have a valid sin6_scope_id in
4493                          * the non-SCOPEDROUTING case.
4494                          */
4495                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4496                         lsa6_storage.sin6_family = AF_INET6;
4497                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4498                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4499                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4500                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4501                                 sctp_m_freem(m);
4502                                 return (error);
4503                         }
4504                         /* XXX */
4505                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4506                         lsa6_storage.sin6_port = inp->sctp_lport;
4507                         lsa6 = &lsa6_storage;
4508                         ip6h->ip6_src = lsa6->sin6_addr;
4509
4510                         if (port) {
4511                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4512                                         sctp_handle_no_route(stcb, net, so_locked);
4513                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4514                                         sctp_m_freem(m);
4515                                         return (EHOSTUNREACH);
4516                                 }
4517                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4518                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4519                                 udp->uh_dport = port;
4520                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4521                                 udp->uh_sum = 0;
4522                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4523                         } else {
4524                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4525                         }
4526
4527                         sctphdr->src_port = src_port;
4528                         sctphdr->dest_port = dest_port;
4529                         sctphdr->v_tag = v_tag;
4530                         sctphdr->checksum = 0;
4531
4532                         /*
4533                          * We set the hop limit now since there is a good
4534                          * chance that our ro pointer is now filled
4535                          */
4536                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4537                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4538
4539 #ifdef SCTP_DEBUG
4540                         /* Copy to be sure something bad is not happening */
4541                         sin6->sin6_addr = ip6h->ip6_dst;
4542                         lsa6->sin6_addr = ip6h->ip6_src;
4543 #endif
4544
4545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4546                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4547                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4548                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4549                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4550                         if (net) {
4551                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4552                                 /*
4553                                  * preserve the port and scope for link
4554                                  * local send
4555                                  */
4556                                 prev_scope = sin6->sin6_scope_id;
4557                                 prev_port = sin6->sin6_port;
4558                         }
4559                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4560                                 /* failed to prepend data, give up */
4561                                 sctp_m_freem(m);
4562                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4563                                 return (ENOMEM);
4564                         }
4565                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4566                         if (port) {
4567 #if defined(SCTP_WITH_NO_CSUM)
4568                                 SCTP_STAT_INCR(sctps_sendnocrc);
4569 #else
4570                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4571                                 SCTP_STAT_INCR(sctps_sendswcrc);
4572 #endif
4573                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4574                                         udp->uh_sum = 0xffff;
4575                                 }
4576                         } else {
4577 #if defined(SCTP_WITH_NO_CSUM)
4578                                 SCTP_STAT_INCR(sctps_sendnocrc);
4579 #else
4580                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4581                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4582                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4583 #endif
4584                         }
4585                         /* send it out. table id is taken from stcb */
4586 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4587                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4588                                 so = SCTP_INP_SO(inp);
4589                                 SCTP_SOCKET_UNLOCK(so, 0);
4590                         }
4591 #endif
4592 #ifdef SCTP_PACKET_LOGGING
4593                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4594                                 sctp_packet_log(o_pak);
4595 #endif
4596                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4597 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4598                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4599                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4600                                 SCTP_TCB_UNLOCK(stcb);
4601                                 SCTP_SOCKET_LOCK(so, 0);
4602                                 SCTP_TCB_LOCK(stcb);
4603                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4604                         }
4605 #endif
4606                         if (net) {
4607                                 /* for link local this must be done */
4608                                 sin6->sin6_scope_id = prev_scope;
4609                                 sin6->sin6_port = prev_port;
4610                         }
4611                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4612                         SCTP_STAT_INCR(sctps_sendpackets);
4613                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4614                         if (ret) {
4615                                 SCTP_STAT_INCR(sctps_senderrors);
4616                         }
4617                         if (net == NULL) {
4618                                 /* Now if we had a temp route free it */
4619                                 RO_RTFREE(ro);
4620                         } else {
4621                                 /*
4622                                  * PMTU check versus smallest asoc MTU goes
4623                                  * here
4624                                  */
4625                                 if (ro->ro_rt == NULL) {
4626                                         /* Route was freed */
4627                                         if (net->ro._s_addr &&
4628                                             net->src_addr_selected) {
4629                                                 sctp_free_ifa(net->ro._s_addr);
4630                                                 net->ro._s_addr = NULL;
4631                                         }
4632                                         net->src_addr_selected = 0;
4633                                 }
4634                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4635                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4636                                         uint32_t mtu;
4637
4638                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4639                                         if (mtu > 0) {
4640                                                 if (net->port) {
4641                                                         mtu -= sizeof(struct udphdr);
4642                                                 }
4643                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4644                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4645                                                 }
4646                                                 net->mtu = mtu;
4647                                         }
4648                                 } else if (ifp) {
4649                                         if (ND_IFINFO(ifp)->linkmtu &&
4650                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4651                                                 sctp_mtu_size_reset(inp,
4652                                                     &stcb->asoc,
4653                                                     ND_IFINFO(ifp)->linkmtu);
4654                                         }
4655                                 }
4656                         }
4657                         return (ret);
4658                 }
4659 #endif
4660         default:
4661                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4662                     ((struct sockaddr *)to)->sa_family);
4663                 sctp_m_freem(m);
4664                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4665                 return (EFAULT);
4666         }
4667 }
4668
4669
4670 void
4671 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4672 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4673     SCTP_UNUSED
4674 #endif
4675 )
4676 {
4677         struct mbuf *m, *m_last;
4678         struct sctp_nets *net;
4679         struct sctp_init_chunk *init;
4680         struct sctp_supported_addr_param *sup_addr;
4681         struct sctp_adaptation_layer_indication *ali;
4682         struct sctp_supported_chunk_types_param *pr_supported;
4683         struct sctp_paramhdr *ph;
4684         int cnt_inits_to = 0;
4685         int error;
4686         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4687
4688         /* INIT's always go to the primary (and usually ONLY address) */
4689         net = stcb->asoc.primary_destination;
4690         if (net == NULL) {
4691                 net = TAILQ_FIRST(&stcb->asoc.nets);
4692                 if (net == NULL) {
4693                         /* TSNH */
4694                         return;
4695                 }
4696                 /* we confirm any address we send an INIT to */
4697                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4698                 (void)sctp_set_primary_addr(stcb, NULL, net);
4699         } else {
4700                 /* we confirm any address we send an INIT to */
4701                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4702         }
4703         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4704 #ifdef INET6
4705         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4706                 /*
4707                  * special hook, if we are sending to link local it will not
4708                  * show up in our private address count.
4709                  */
4710                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4711                         cnt_inits_to = 1;
4712         }
4713 #endif
4714         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4715                 /* This case should not happen */
4716                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4717                 return;
4718         }
4719         /* start the INIT timer */
4720         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4721
4722         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4723         if (m == NULL) {
4724                 /* No memory, INIT timer will re-attempt. */
4725                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4726                 return;
4727         }
4728         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4729         padding_len = 0;
4730         /* Now lets put the chunk header in place */
4731         init = mtod(m, struct sctp_init_chunk *);
4732         /* now the chunk header */
4733         init->ch.chunk_type = SCTP_INITIATION;
4734         init->ch.chunk_flags = 0;
4735         /* fill in later from mbuf we build */
4736         init->ch.chunk_length = 0;
4737         /* place in my tag */
4738         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4739         /* set up some of the credits. */
4740         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4741             SCTP_MINIMAL_RWND));
4742         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4743         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4744         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4745
4746         /* Adaptation layer indication parameter */
4747         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4748                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4749                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4750                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4751                 ali->ph.param_length = htons(parameter_len);
4752                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4753                 chunk_len += parameter_len;
4754         }
4755         /* ECN parameter */
4756         if (stcb->asoc.ecn_supported == 1) {
4757                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4758                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4759                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4760                 ph->param_length = htons(parameter_len);
4761                 chunk_len += parameter_len;
4762         }
4763         /* PR-SCTP supported parameter */
4764         if (stcb->asoc.prsctp_supported == 1) {
4765                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4766                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4767                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4768                 ph->param_length = htons(parameter_len);
4769                 chunk_len += parameter_len;
4770         }
4771         /* Add NAT friendly parameter. */
4772         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4773                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4774                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4775                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4776                 ph->param_length = htons(parameter_len);
4777                 chunk_len += parameter_len;
4778         }
4779         /* And now tell the peer which extensions we support */
4780         num_ext = 0;
4781         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4782         if (stcb->asoc.prsctp_supported == 1) {
4783                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4784                 if (stcb->asoc.idata_supported) {
4785                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4786                 }
4787         }
4788         if (stcb->asoc.auth_supported == 1) {
4789                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4790         }
4791         if (stcb->asoc.asconf_supported == 1) {
4792                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4793                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4794         }
4795         if (stcb->asoc.reconfig_supported == 1) {
4796                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4797         }
4798         if (stcb->asoc.idata_supported) {
4799                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4800         }
4801         if (stcb->asoc.nrsack_supported == 1) {
4802                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4803         }
4804         if (stcb->asoc.pktdrop_supported == 1) {
4805                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4806         }
4807         if (num_ext > 0) {
4808                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4809                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4810                 pr_supported->ph.param_length = htons(parameter_len);
4811                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4812                 chunk_len += parameter_len;
4813         }
4814         /* add authentication parameters */
4815         if (stcb->asoc.auth_supported) {
4816                 /* attach RANDOM parameter, if available */
4817                 if (stcb->asoc.authinfo.random != NULL) {
4818                         struct sctp_auth_random *randp;
4819
4820                         if (padding_len > 0) {
4821                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4822                                 chunk_len += padding_len;
4823                                 padding_len = 0;
4824                         }
4825                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4826                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4827                         /* random key already contains the header */
4828                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4829                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4830                         chunk_len += parameter_len;
4831                 }
4832                 /* add HMAC_ALGO parameter */
4833                 if (stcb->asoc.local_hmacs != NULL) {
4834                         struct sctp_auth_hmac_algo *hmacs;
4835
4836                         if (padding_len > 0) {
4837                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4838                                 chunk_len += padding_len;
4839                                 padding_len = 0;
4840                         }
4841                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4842                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4843                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4844                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4845                         hmacs->ph.param_length = htons(parameter_len);
4846                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4847                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4848                         chunk_len += parameter_len;
4849                 }
4850                 /* add CHUNKS parameter */
4851                 if (stcb->asoc.local_auth_chunks != NULL) {
4852                         struct sctp_auth_chunk_list *chunks;
4853
4854                         if (padding_len > 0) {
4855                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4856                                 chunk_len += padding_len;
4857                                 padding_len = 0;
4858                         }
4859                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4860                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4861                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4862                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4863                         chunks->ph.param_length = htons(parameter_len);
4864                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4865                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4866                         chunk_len += parameter_len;
4867                 }
4868         }
4869         /* now any cookie time extensions */
4870         if (stcb->asoc.cookie_preserve_req) {
4871                 struct sctp_cookie_perserve_param *cookie_preserve;
4872
4873                 if (padding_len > 0) {
4874                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4875                         chunk_len += padding_len;
4876                         padding_len = 0;
4877                 }
4878                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4879                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4880                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4881                 cookie_preserve->ph.param_length = htons(parameter_len);
4882                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4883                 stcb->asoc.cookie_preserve_req = 0;
4884                 chunk_len += parameter_len;
4885         }
4886         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4887                 uint8_t i;
4888
4889                 if (padding_len > 0) {
4890                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4891                         chunk_len += padding_len;
4892                         padding_len = 0;
4893                 }
4894                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4895                 if (stcb->asoc.scope.ipv4_addr_legal) {
4896                         parameter_len += (uint16_t)sizeof(uint16_t);
4897                 }
4898                 if (stcb->asoc.scope.ipv6_addr_legal) {
4899                         parameter_len += (uint16_t)sizeof(uint16_t);
4900                 }
4901                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4902                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4903                 sup_addr->ph.param_length = htons(parameter_len);
4904                 i = 0;
4905                 if (stcb->asoc.scope.ipv4_addr_legal) {
4906                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4907                 }
4908                 if (stcb->asoc.scope.ipv6_addr_legal) {
4909                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4910                 }
4911                 padding_len = 4 - 2 * i;
4912                 chunk_len += parameter_len;
4913         }
4914         SCTP_BUF_LEN(m) = chunk_len;
4915         /* now the addresses */
4916         /*
4917          * To optimize this we could put the scoping stuff into a structure
4918          * and remove the individual uint8's from the assoc structure. Then
4919          * we could just sifa in the address within the stcb. But for now
4920          * this is a quick hack to get the address stuff teased apart.
4921          */
4922         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4923             m, cnt_inits_to,
4924             &padding_len, &chunk_len);
4925
4926         init->ch.chunk_length = htons(chunk_len);
4927         if (padding_len > 0) {
4928                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4929                         sctp_m_freem(m);
4930                         return;
4931                 }
4932         }
4933         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4934         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4935             (struct sockaddr *)&net->ro._l_addr,
4936             m, 0, NULL, 0, 0, 0, 0,
4937             inp->sctp_lport, stcb->rport, htonl(0),
4938             net->port, NULL,
4939             0, 0,
4940             so_locked))) {
4941                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4942                 if (error == ENOBUFS) {
4943                         stcb->asoc.ifp_had_enobuf = 1;
4944                         SCTP_STAT_INCR(sctps_lowlevelerr);
4945                 }
4946         } else {
4947                 stcb->asoc.ifp_had_enobuf = 0;
4948         }
4949         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4950         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4951 }
4952
4953 struct mbuf *
4954 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4955     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4956 {
4957         /*
4958          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4959          * being equal to the beginning of the params i.e. (iphlen +
4960          * sizeof(struct sctp_init_msg) parse through the parameters to the
4961          * end of the mbuf verifying that all parameters are known.
4962          *
4963          * For unknown parameters build and return a mbuf with
4964          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4965          * processing this chunk stop, and set *abort_processing to 1.
4966          *
4967          * By having param_offset be pre-set to where parameters begin it is
4968          * hoped that this routine may be reused in the future by new
4969          * features.
4970          */
4971         struct sctp_paramhdr *phdr, params;
4972
4973         struct mbuf *mat, *op_err;
4974         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4975         int at, limit, pad_needed;
4976         uint16_t ptype, plen, padded_size;
4977         int err_at;
4978
4979         *abort_processing = 0;
4980         mat = in_initpkt;
4981         err_at = 0;
4982         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4983         at = param_offset;
4984         op_err = NULL;
4985         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4986         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4987         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4988                 ptype = ntohs(phdr->param_type);
4989                 plen = ntohs(phdr->param_length);
4990                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4991                         /* wacked parameter */
4992                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4993                         goto invalid_size;
4994                 }
4995                 limit -= SCTP_SIZE32(plen);
4996                 /*-
4997                  * All parameters for all chunks that we know/understand are
4998                  * listed here. We process them other places and make
4999                  * appropriate stop actions per the upper bits. However this
5000                  * is the generic routine processor's can call to get back
5001                  * an operr.. to either incorporate (init-ack) or send.
5002                  */
5003                 padded_size = SCTP_SIZE32(plen);
5004                 switch (ptype) {
5005                         /* Param's with variable size */
5006                 case SCTP_HEARTBEAT_INFO:
5007                 case SCTP_STATE_COOKIE:
5008                 case SCTP_UNRECOG_PARAM:
5009                 case SCTP_ERROR_CAUSE_IND:
5010                         /* ok skip fwd */
5011                         at += padded_size;
5012                         break;
5013                         /* Param's with variable size within a range */
5014                 case SCTP_CHUNK_LIST:
5015                 case SCTP_SUPPORTED_CHUNK_EXT:
5016                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5017                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5018                                 goto invalid_size;
5019                         }
5020                         at += padded_size;
5021                         break;
5022                 case SCTP_SUPPORTED_ADDRTYPE:
5023                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5024                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5025                                 goto invalid_size;
5026                         }
5027                         at += padded_size;
5028                         break;
5029                 case SCTP_RANDOM:
5030                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5031                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5032                                 goto invalid_size;
5033                         }
5034                         at += padded_size;
5035                         break;
5036                 case SCTP_SET_PRIM_ADDR:
5037                 case SCTP_DEL_IP_ADDRESS:
5038                 case SCTP_ADD_IP_ADDRESS:
5039                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5040                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                         /* Param's with a fixed size */
5047                 case SCTP_IPV4_ADDRESS:
5048                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5049                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5050                                 goto invalid_size;
5051                         }
5052                         at += padded_size;
5053                         break;
5054                 case SCTP_IPV6_ADDRESS:
5055                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5056                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5057                                 goto invalid_size;
5058                         }
5059                         at += padded_size;
5060                         break;
5061                 case SCTP_COOKIE_PRESERVE:
5062                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5063                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5064                                 goto invalid_size;
5065                         }
5066                         at += padded_size;
5067                         break;
5068                 case SCTP_HAS_NAT_SUPPORT:
5069                         *nat_friendly = 1;
5070                         /* fall through */
5071                 case SCTP_PRSCTP_SUPPORTED:
5072                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_ECN_CAPABLE:
5079                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5081                                 goto invalid_size;
5082                         }
5083                         at += padded_size;
5084                         break;
5085                 case SCTP_ULP_ADAPTATION:
5086                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5087                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5088                                 goto invalid_size;
5089                         }
5090                         at += padded_size;
5091                         break;
5092                 case SCTP_SUCCESS_REPORT:
5093                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5094                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5095                                 goto invalid_size;
5096                         }
5097                         at += padded_size;
5098                         break;
5099                 case SCTP_HOSTNAME_ADDRESS:
5100                         {
5101                                 /* We can NOT handle HOST NAME addresses!! */
5102                                 int l_len;
5103
5104                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5105                                 *abort_processing = 1;
5106                                 if (op_err == NULL) {
5107                                         /* Ok need to try to get a mbuf */
5108 #ifdef INET6
5109                                         l_len = SCTP_MIN_OVERHEAD;
5110 #else
5111                                         l_len = SCTP_MIN_V4_OVERHEAD;
5112 #endif
5113                                         l_len += sizeof(struct sctp_chunkhdr);
5114                                         l_len += plen;
5115                                         l_len += sizeof(struct sctp_paramhdr);
5116                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5117                                         if (op_err) {
5118                                                 SCTP_BUF_LEN(op_err) = 0;
5119                                                 /*
5120                                                  * pre-reserve space for ip
5121                                                  * and sctp header  and
5122                                                  * chunk hdr
5123                                                  */
5124 #ifdef INET6
5125                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5126 #else
5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5128 #endif
5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5130                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5131                                         }
5132                                 }
5133                                 if (op_err) {
5134                                         /* If we have space */
5135                                         struct sctp_paramhdr s;
5136
5137                                         if (err_at % 4) {
5138                                                 uint32_t cpthis = 0;
5139
5140                                                 pad_needed = 4 - (err_at % 4);
5141                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5142                                                 err_at += pad_needed;
5143                                         }
5144                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5145                                         s.param_length = htons(sizeof(s) + plen);
5146                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5147                                         err_at += sizeof(s);
5148                                         if (plen > sizeof(tempbuf)) {
5149                                                 plen = sizeof(tempbuf);
5150                                         }
5151                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5152                                         if (phdr == NULL) {
5153                                                 sctp_m_freem(op_err);
5154                                                 /*
5155                                                  * we are out of memory but
5156                                                  * we still need to have a
5157                                                  * look at what to do (the
5158                                                  * system is in trouble
5159                                                  * though).
5160                                                  */
5161                                                 return (NULL);
5162                                         }
5163                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5164                                 }
5165                                 return (op_err);
5166                                 break;
5167                         }
5168                 default:
5169                         /*
5170                          * we do not recognize the parameter figure out what
5171                          * we do.
5172                          */
5173                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5174                         if ((ptype & 0x4000) == 0x4000) {
5175                                 /* Report bit is set?? */
5176                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5177                                 if (op_err == NULL) {
5178                                         int l_len;
5179
5180                                         /* Ok need to try to get an mbuf */
5181 #ifdef INET6
5182                                         l_len = SCTP_MIN_OVERHEAD;
5183 #else
5184                                         l_len = SCTP_MIN_V4_OVERHEAD;
5185 #endif
5186                                         l_len += sizeof(struct sctp_chunkhdr);
5187                                         l_len += plen;
5188                                         l_len += sizeof(struct sctp_paramhdr);
5189                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5190                                         if (op_err) {
5191                                                 SCTP_BUF_LEN(op_err) = 0;
5192 #ifdef INET6
5193                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5194 #else
5195                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5196 #endif
5197                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5198                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5199                                         }
5200                                 }
5201                                 if (op_err) {
5202                                         /* If we have space */
5203                                         struct sctp_paramhdr s;
5204
5205                                         if (err_at % 4) {
5206                                                 uint32_t cpthis = 0;
5207
5208                                                 pad_needed = 4 - (err_at % 4);
5209                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5210                                                 err_at += pad_needed;
5211                                         }
5212                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5213                                         s.param_length = htons(sizeof(s) + plen);
5214                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5215                                         err_at += sizeof(s);
5216                                         if (plen > sizeof(tempbuf)) {
5217                                                 plen = sizeof(tempbuf);
5218                                         }
5219                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5220                                         if (phdr == NULL) {
5221                                                 sctp_m_freem(op_err);
5222                                                 /*
5223                                                  * we are out of memory but
5224                                                  * we still need to have a
5225                                                  * look at what to do (the
5226                                                  * system is in trouble
5227                                                  * though).
5228                                                  */
5229                                                 op_err = NULL;
5230                                                 goto more_processing;
5231                                         }
5232                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5233                                         err_at += plen;
5234                                 }
5235                         }
5236         more_processing:
5237                         if ((ptype & 0x8000) == 0x0000) {
5238                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5239                                 return (op_err);
5240                         } else {
5241                                 /* skip this chunk and continue processing */
5242                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5243                                 at += SCTP_SIZE32(plen);
5244                         }
5245                         break;
5246
5247                 }
5248                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5249         }
5250         return (op_err);
5251 invalid_size:
5252         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5253         *abort_processing = 1;
5254         if ((op_err == NULL) && phdr) {
5255                 int l_len;
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 #ifdef INET
5314         struct sockaddr_in sin4, *sa4;
5315 #endif
5316 #ifdef INET6
5317         struct sockaddr_in6 sin6, *sa6;
5318 #endif
5319
5320 #ifdef INET
5321         memset(&sin4, 0, sizeof(sin4));
5322         sin4.sin_family = AF_INET;
5323         sin4.sin_len = sizeof(sin4);
5324 #endif
5325 #ifdef INET6
5326         memset(&sin6, 0, sizeof(sin6));
5327         sin6.sin6_family = AF_INET6;
5328         sin6.sin6_len = sizeof(sin6);
5329 #endif
5330         /* First what about the src address of the pkt ? */
5331         check_src = 0;
5332         switch (src->sa_family) {
5333 #ifdef INET
5334         case AF_INET:
5335                 if (asoc->scope.ipv4_addr_legal) {
5336                         check_src = 1;
5337                 }
5338                 break;
5339 #endif
5340 #ifdef INET6
5341         case AF_INET6:
5342                 if (asoc->scope.ipv6_addr_legal) {
5343                         check_src = 1;
5344                 }
5345                 break;
5346 #endif
5347         default:
5348                 /* TSNH */
5349                 break;
5350         }
5351         if (check_src) {
5352                 fnd = 0;
5353                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5354                         sa = (struct sockaddr *)&net->ro._l_addr;
5355                         if (sa->sa_family == src->sa_family) {
5356 #ifdef INET
5357                                 if (sa->sa_family == AF_INET) {
5358                                         struct sockaddr_in *src4;
5359
5360                                         sa4 = (struct sockaddr_in *)sa;
5361                                         src4 = (struct sockaddr_in *)src;
5362                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5363                                                 fnd = 1;
5364                                                 break;
5365                                         }
5366                                 }
5367 #endif
5368 #ifdef INET6
5369                                 if (sa->sa_family == AF_INET6) {
5370                                         struct sockaddr_in6 *src6;
5371
5372                                         sa6 = (struct sockaddr_in6 *)sa;
5373                                         src6 = (struct sockaddr_in6 *)src;
5374                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5375                                                 fnd = 1;
5376                                                 break;
5377                                         }
5378                                 }
5379 #endif
5380                         }
5381                 }
5382                 if (fnd == 0) {
5383                         /* New address added! no need to look further. */
5384                         return (1);
5385                 }
5386         }
5387         /* Ok so far lets munge through the rest of the packet */
5388         offset += sizeof(struct sctp_init_chunk);
5389         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5390         while (phdr) {
5391                 sa_touse = NULL;
5392                 ptype = ntohs(phdr->param_type);
5393                 plen = ntohs(phdr->param_length);
5394                 switch (ptype) {
5395 #ifdef INET
5396                 case SCTP_IPV4_ADDRESS:
5397                         {
5398                                 struct sctp_ipv4addr_param *p4, p4_buf;
5399
5400                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5401                                         return (1);
5402                                 }
5403                                 phdr = sctp_get_next_param(in_initpkt, offset,
5404                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5405                                 if (phdr == NULL) {
5406                                         return (1);
5407                                 }
5408                                 if (asoc->scope.ipv4_addr_legal) {
5409                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5410                                         sin4.sin_addr.s_addr = p4->addr;
5411                                         sa_touse = (struct sockaddr *)&sin4;
5412                                 }
5413                                 break;
5414                         }
5415 #endif
5416 #ifdef INET6
5417                 case SCTP_IPV6_ADDRESS:
5418                         {
5419                                 struct sctp_ipv6addr_param *p6, p6_buf;
5420
5421                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5422                                         return (1);
5423                                 }
5424                                 phdr = sctp_get_next_param(in_initpkt, offset,
5425                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5426                                 if (phdr == NULL) {
5427                                         return (1);
5428                                 }
5429                                 if (asoc->scope.ipv6_addr_legal) {
5430                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5431                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5432                                             sizeof(p6->addr));
5433                                         sa_touse = (struct sockaddr *)&sin6;
5434                                 }
5435                                 break;
5436                         }
5437 #endif
5438                 default:
5439                         sa_touse = NULL;
5440                         break;
5441                 }
5442                 if (sa_touse) {
5443                         /* ok, sa_touse points to one to check */
5444                         fnd = 0;
5445                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5446                                 sa = (struct sockaddr *)&net->ro._l_addr;
5447                                 if (sa->sa_family != sa_touse->sa_family) {
5448                                         continue;
5449                                 }
5450 #ifdef INET
5451                                 if (sa->sa_family == AF_INET) {
5452                                         sa4 = (struct sockaddr_in *)sa;
5453                                         if (sa4->sin_addr.s_addr ==
5454                                             sin4.sin_addr.s_addr) {
5455                                                 fnd = 1;
5456                                                 break;
5457                                         }
5458                                 }
5459 #endif
5460 #ifdef INET6
5461                                 if (sa->sa_family == AF_INET6) {
5462                                         sa6 = (struct sockaddr_in6 *)sa;
5463                                         if (SCTP6_ARE_ADDR_EQUAL(
5464                                             sa6, &sin6)) {
5465                                                 fnd = 1;
5466                                                 break;
5467                                         }
5468                                 }
5469 #endif
5470                         }
5471                         if (!fnd) {
5472                                 /* New addr added! no need to look further */
5473                                 return (1);
5474                         }
5475                 }
5476                 offset += SCTP_SIZE32(plen);
5477                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5478         }
5479         return (0);
5480 }
5481
5482 /*
5483  * Given a MBUF chain that was sent into us containing an INIT. Build a
5484  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5485  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5486  * message (i.e. the struct sctp_init_msg).
5487  */
5488 void
5489 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5490     struct sctp_nets *src_net, struct mbuf *init_pkt,
5491     int iphlen, int offset,
5492     struct sockaddr *src, struct sockaddr *dst,
5493     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5494     uint8_t mflowtype, uint32_t mflowid,
5495     uint32_t vrf_id, uint16_t port)
5496 {
5497         struct sctp_association *asoc;
5498         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5499         struct sctp_init_ack_chunk *initack;
5500         struct sctp_adaptation_layer_indication *ali;
5501         struct sctp_supported_chunk_types_param *pr_supported;
5502         struct sctp_paramhdr *ph;
5503         union sctp_sockstore *over_addr;
5504         struct sctp_scoping scp;
5505         struct timeval now;
5506 #ifdef INET
5507         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5508         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5509         struct sockaddr_in *sin;
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 #endif
5516         struct sockaddr *to;
5517         struct sctp_state_cookie stc;
5518         struct sctp_nets *net = NULL;
5519         uint8_t *signature = NULL;
5520         int cnt_inits_to = 0;
5521         uint16_t his_limit, i_want;
5522         int abort_flag;
5523         int nat_friendly = 0;
5524         int error;
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
5541                          * cause. This looks no different than if no
5542                          * listener was 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.
5557                          * This 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(&now);
5607         stc.time_entered.tv_sec = now.tv_sec;
5608         stc.time_entered.tv_usec = now.tv_usec;
5609
5610         /* populate any tie tags */
5611         if (asoc != NULL) {
5612                 /* unlock before tag selections */
5613                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5614                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5615                 stc.cookie_life = asoc->cookie_life;
5616                 net = asoc->primary_destination;
5617         } else {
5618                 stc.tie_tag_my_vtag = 0;
5619                 stc.tie_tag_peer_vtag = 0;
5620                 /* life I will award this cookie */
5621                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5622         }
5623
5624         /* copy in the ports for later check */
5625         stc.myport = sh->dest_port;
5626         stc.peerport = sh->src_port;
5627
5628         /*
5629          * If we wanted to honor cookie life extensions, we would add to
5630          * stc.cookie_life. For now we should NOT honor any extension
5631          */
5632         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5633         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5634                 stc.ipv6_addr_legal = 1;
5635                 if (SCTP_IPV6_V6ONLY(inp)) {
5636                         stc.ipv4_addr_legal = 0;
5637                 } else {
5638                         stc.ipv4_addr_legal = 1;
5639                 }
5640         } else {
5641                 stc.ipv6_addr_legal = 0;
5642                 stc.ipv4_addr_legal = 1;
5643         }
5644         stc.ipv4_scope = 0;
5645         if (net == NULL) {
5646                 to = src;
5647                 switch (dst->sa_family) {
5648 #ifdef INET
5649                 case AF_INET:
5650                         {
5651                                 /* lookup address */
5652                                 stc.address[0] = src4->sin_addr.s_addr;
5653                                 stc.address[1] = 0;
5654                                 stc.address[2] = 0;
5655                                 stc.address[3] = 0;
5656                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5657                                 /* local from address */
5658                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5659                                 stc.laddress[1] = 0;
5660                                 stc.laddress[2] = 0;
5661                                 stc.laddress[3] = 0;
5662                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5663                                 /* scope_id is only for v6 */
5664                                 stc.scope_id = 0;
5665                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5666                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5667                                         stc.ipv4_scope = 1;
5668                                 }
5669                                 /* Must use the address in this case */
5670                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5671                                         stc.loopback_scope = 1;
5672                                         stc.ipv4_scope = 1;
5673                                         stc.site_scope = 1;
5674                                         stc.local_scope = 0;
5675                                 }
5676                                 break;
5677                         }
5678 #endif
5679 #ifdef INET6
5680                 case AF_INET6:
5681                         {
5682                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5683                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5684                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5685                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5686                                         stc.loopback_scope = 1;
5687                                         stc.local_scope = 0;
5688                                         stc.site_scope = 1;
5689                                         stc.ipv4_scope = 1;
5690                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5691                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5692                                         /*
5693                                          * If the new destination or source
5694                                          * is a LINK_LOCAL we must have
5695                                          * common both site and local scope.
5696                                          * Don't set local scope though
5697                                          * since we must depend on the
5698                                          * source to be added implicitly. We
5699                                          * cannot assure just because we
5700                                          * share one link that all links are
5701                                          * common.
5702                                          */
5703                                         stc.local_scope = 0;
5704                                         stc.site_scope = 1;
5705                                         stc.ipv4_scope = 1;
5706                                         /*
5707                                          * we start counting for the private
5708                                          * address stuff at 1. since the
5709                                          * link local we source from won't
5710                                          * show up in our scoped count.
5711                                          */
5712                                         cnt_inits_to = 1;
5713                                         /*
5714                                          * pull out the scope_id from
5715                                          * incoming pkt
5716                                          */
5717                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5718                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5719                                         /*
5720                                          * If the new destination or source
5721                                          * is SITE_LOCAL then we must have
5722                                          * site scope in common.
5723                                          */
5724                                         stc.site_scope = 1;
5725                                 }
5726                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5727                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5728                                 break;
5729                         }
5730 #endif
5731                 default:
5732                         /* TSNH */
5733                         goto do_a_abort;
5734                         break;
5735                 }
5736         } else {
5737                 /* set the scope per the existing tcb */
5738
5739 #ifdef INET6
5740                 struct sctp_nets *lnet;
5741 #endif
5742
5743                 stc.loopback_scope = asoc->scope.loopback_scope;
5744                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5745                 stc.site_scope = asoc->scope.site_scope;
5746                 stc.local_scope = asoc->scope.local_scope;
5747 #ifdef INET6
5748                 /* Why do we not consider IPv4 LL addresses? */
5749                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5750                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5751                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5752                                         /*
5753                                          * if we have a LL address, start
5754                                          * counting at 1.
5755                                          */
5756                                         cnt_inits_to = 1;
5757                                 }
5758                         }
5759                 }
5760 #endif
5761                 /* use the net pointer */
5762                 to = (struct sockaddr *)&net->ro._l_addr;
5763                 switch (to->sa_family) {
5764 #ifdef INET
5765                 case AF_INET:
5766                         sin = (struct sockaddr_in *)to;
5767                         stc.address[0] = sin->sin_addr.s_addr;
5768                         stc.address[1] = 0;
5769                         stc.address[2] = 0;
5770                         stc.address[3] = 0;
5771                         stc.addr_type = SCTP_IPV4_ADDRESS;
5772                         if (net->src_addr_selected == 0) {
5773                                 /*
5774                                  * strange case here, the INIT should have
5775                                  * did the selection.
5776                                  */
5777                                 net->ro._s_addr = sctp_source_address_selection(inp,
5778                                     stcb, (sctp_route_t *)&net->ro,
5779                                     net, 0, vrf_id);
5780                                 if (net->ro._s_addr == NULL)
5781                                         return;
5782
5783                                 net->src_addr_selected = 1;
5784
5785                         }
5786                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5787                         stc.laddress[1] = 0;
5788                         stc.laddress[2] = 0;
5789                         stc.laddress[3] = 0;
5790                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5791                         /* scope_id is only for v6 */
5792                         stc.scope_id = 0;
5793                         break;
5794 #endif
5795 #ifdef INET6
5796                 case AF_INET6:
5797                         sin6 = (struct sockaddr_in6 *)to;
5798                         memcpy(&stc.address, &sin6->sin6_addr,
5799                             sizeof(struct in6_addr));
5800                         stc.addr_type = SCTP_IPV6_ADDRESS;
5801                         stc.scope_id = sin6->sin6_scope_id;
5802                         if (net->src_addr_selected == 0) {
5803                                 /*
5804                                  * strange case here, the INIT should have
5805                                  * done the selection.
5806                                  */
5807                                 net->ro._s_addr = sctp_source_address_selection(inp,
5808                                     stcb, (sctp_route_t *)&net->ro,
5809                                     net, 0, vrf_id);
5810                                 if (net->ro._s_addr == NULL)
5811                                         return;
5812
5813                                 net->src_addr_selected = 1;
5814                         }
5815                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5816                             sizeof(struct in6_addr));
5817                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5818                         break;
5819 #endif
5820                 }
5821         }
5822         /* Now lets put the SCTP header in place */
5823         initack = mtod(m, struct sctp_init_ack_chunk *);
5824         /* Save it off for quick ref */
5825         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5826         /* who are we */
5827         memcpy(stc.identification, SCTP_VERSION_STRING,
5828             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5829         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5830         /* now the chunk header */
5831         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5832         initack->ch.chunk_flags = 0;
5833         /* fill in later from mbuf we build */
5834         initack->ch.chunk_length = 0;
5835         /* place in my tag */
5836         if ((asoc != NULL) &&
5837             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5838             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5839             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5840                 /* re-use the v-tags and init-seq here */
5841                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5842                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5843         } else {
5844                 uint32_t vtag, itsn;
5845
5846                 if (asoc) {
5847                         atomic_add_int(&asoc->refcnt, 1);
5848                         SCTP_TCB_UNLOCK(stcb);
5849         new_tag:
5850                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5851                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5852                                 /*
5853                                  * Got a duplicate vtag on some guy behind a
5854                                  * nat make sure we don't use it.
5855                                  */
5856                                 goto new_tag;
5857                         }
5858                         initack->init.initiate_tag = htonl(vtag);
5859                         /* get a TSN to use too */
5860                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5861                         initack->init.initial_tsn = htonl(itsn);
5862                         SCTP_TCB_LOCK(stcb);
5863                         atomic_add_int(&asoc->refcnt, -1);
5864                 } else {
5865                         SCTP_INP_INCR_REF(inp);
5866                         SCTP_INP_RUNLOCK(inp);
5867                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5868                         initack->init.initiate_tag = htonl(vtag);
5869                         /* get a TSN to use too */
5870                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5871                         SCTP_INP_RLOCK(inp);
5872                         SCTP_INP_DECR_REF(inp);
5873                 }
5874         }
5875         /* save away my tag to */
5876         stc.my_vtag = initack->init.initiate_tag;
5877
5878         /* set up some of the credits. */
5879         so = inp->sctp_socket;
5880         if (so == NULL) {
5881                 /* memory problem */
5882                 sctp_m_freem(m);
5883                 return;
5884         } else {
5885                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5886         }
5887         /* set what I want */
5888         his_limit = ntohs(init_chk->init.num_inbound_streams);
5889         /* choose what I want */
5890         if (asoc != NULL) {
5891                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5892                         i_want = asoc->streamoutcnt;
5893                 } else {
5894                         i_want = asoc->pre_open_streams;
5895                 }
5896         } else {
5897                 i_want = inp->sctp_ep.pre_open_stream_count;
5898         }
5899         if (his_limit < i_want) {
5900                 /* I Want more :< */
5901                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5902         } else {
5903                 /* I can have what I want :> */
5904                 initack->init.num_outbound_streams = htons(i_want);
5905         }
5906         /* tell him his limit. */
5907         initack->init.num_inbound_streams =
5908             htons(inp->sctp_ep.max_open_streams_intome);
5909
5910         /* adaptation layer indication parameter */
5911         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5912                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5913                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5914                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5915                 ali->ph.param_length = htons(parameter_len);
5916                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5917                 chunk_len += parameter_len;
5918         }
5919         /* ECN parameter */
5920         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5921             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5922                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5923                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5924                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5925                 ph->param_length = htons(parameter_len);
5926                 chunk_len += parameter_len;
5927         }
5928         /* PR-SCTP supported parameter */
5929         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5930             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5931                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5932                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5933                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5934                 ph->param_length = htons(parameter_len);
5935                 chunk_len += parameter_len;
5936         }
5937         /* Add NAT friendly parameter */
5938         if (nat_friendly) {
5939                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5940                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5941                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5942                 ph->param_length = htons(parameter_len);
5943                 chunk_len += parameter_len;
5944         }
5945         /* And now tell the peer which extensions we support */
5946         num_ext = 0;
5947         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5948         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5949             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5950                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5951                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5952                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5953                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5954                 }
5955         }
5956         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5957             ((asoc == NULL) && (inp->auth_supported == 1))) {
5958                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5959         }
5960         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5961             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5962                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5963                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5964         }
5965         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5966             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5967                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5968         }
5969         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5970             ((asoc == NULL) && (inp->idata_supported == 1))) {
5971                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5972         }
5973         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5974             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5975                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5976         }
5977         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5978             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5979                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5980         }
5981         if (num_ext > 0) {
5982                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5983                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5984                 pr_supported->ph.param_length = htons(parameter_len);
5985                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5986                 chunk_len += parameter_len;
5987         }
5988         /* add authentication parameters */
5989         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5990             ((asoc == NULL) && (inp->auth_supported == 1))) {
5991                 struct sctp_auth_random *randp;
5992                 struct sctp_auth_hmac_algo *hmacs;
5993                 struct sctp_auth_chunk_list *chunks;
5994
5995                 if (padding_len > 0) {
5996                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5997                         chunk_len += padding_len;
5998                         padding_len = 0;
5999                 }
6000                 /* generate and add RANDOM parameter */
6001                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6002                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6003                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6004                 randp->ph.param_type = htons(SCTP_RANDOM);
6005                 randp->ph.param_length = htons(parameter_len);
6006                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6007                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6008                 chunk_len += parameter_len;
6009
6010                 if (padding_len > 0) {
6011                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6012                         chunk_len += padding_len;
6013                         padding_len = 0;
6014                 }
6015                 /* add HMAC_ALGO parameter */
6016                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6017                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6018                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6019                     (uint8_t *)hmacs->hmac_ids);
6020                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6021                 hmacs->ph.param_length = htons(parameter_len);
6022                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6023                 chunk_len += parameter_len;
6024
6025                 if (padding_len > 0) {
6026                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6027                         chunk_len += padding_len;
6028                         padding_len = 0;
6029                 }
6030                 /* add CHUNKS parameter */
6031                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6032                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6033                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6034                     chunks->chunk_types);
6035                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6036                 chunks->ph.param_length = htons(parameter_len);
6037                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6038                 chunk_len += parameter_len;
6039         }
6040         SCTP_BUF_LEN(m) = chunk_len;
6041         m_last = m;
6042         /* now the addresses */
6043         /*
6044          * To optimize this we could put the scoping stuff into a structure
6045          * and remove the individual uint8's from the stc structure. Then we
6046          * could just sifa in the address within the stc.. but for now this
6047          * is a quick hack to get the address stuff teased apart.
6048          */
6049         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6050         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6051         scp.loopback_scope = stc.loopback_scope;
6052         scp.ipv4_local_scope = stc.ipv4_scope;
6053         scp.local_scope = stc.local_scope;
6054         scp.site_scope = stc.site_scope;
6055         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6056             cnt_inits_to,
6057             &padding_len, &chunk_len);
6058         /* padding_len can only be positive, if no addresses have been added */
6059         if (padding_len > 0) {
6060                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6061                 chunk_len += padding_len;
6062                 SCTP_BUF_LEN(m) += padding_len;
6063                 padding_len = 0;
6064         }
6065         /* tack on the operational error if present */
6066         if (op_err) {
6067                 parameter_len = 0;
6068                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6069                         parameter_len += SCTP_BUF_LEN(m_tmp);
6070                 }
6071                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6072                 SCTP_BUF_NEXT(m_last) = op_err;
6073                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6074                         m_last = SCTP_BUF_NEXT(m_last);
6075                 }
6076                 chunk_len += parameter_len;
6077         }
6078         if (padding_len > 0) {
6079                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6080                 if (m_last == NULL) {
6081                         /* Houston we have a problem, no space */
6082                         sctp_m_freem(m);
6083                         return;
6084                 }
6085                 chunk_len += padding_len;
6086                 padding_len = 0;
6087         }
6088         /* Now we must build a cookie */
6089         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6090         if (m_cookie == NULL) {
6091                 /* memory problem */
6092                 sctp_m_freem(m);
6093                 return;
6094         }
6095         /* Now append the cookie to the end and update the space/size */
6096         SCTP_BUF_NEXT(m_last) = m_cookie;
6097         parameter_len = 0;
6098         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6099                 parameter_len += SCTP_BUF_LEN(m_tmp);
6100                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6101                         m_last = m_tmp;
6102                 }
6103         }
6104         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6105         chunk_len += parameter_len;
6106
6107         /*
6108          * Place in the size, but we don't include the last pad (if any) in
6109          * the INIT-ACK.
6110          */
6111         initack->ch.chunk_length = htons(chunk_len);
6112
6113         /*
6114          * Time to sign the cookie, we don't sign over the cookie signature
6115          * though thus we set trailer.
6116          */
6117         (void)sctp_hmac_m(SCTP_HMAC,
6118             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6119             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6120             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6121         /*
6122          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6123          * here since the timer will drive a retranmission.
6124          */
6125         if (padding_len > 0) {
6126                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6127                         sctp_m_freem(m);
6128                         return;
6129                 }
6130         }
6131         if (stc.loopback_scope) {
6132                 over_addr = (union sctp_sockstore *)dst;
6133         } else {
6134                 over_addr = NULL;
6135         }
6136
6137         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6138             0, 0,
6139             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6140             port, over_addr,
6141             mflowtype, mflowid,
6142             SCTP_SO_NOT_LOCKED))) {
6143                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6144                 if (error == ENOBUFS) {
6145                         if (asoc != NULL) {
6146                                 asoc->ifp_had_enobuf = 1;
6147                         }
6148                         SCTP_STAT_INCR(sctps_lowlevelerr);
6149                 }
6150         } else {
6151                 if (asoc != NULL) {
6152                         asoc->ifp_had_enobuf = 0;
6153                 }
6154         }
6155         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6156 }
6157
6158
6159 static void
6160 sctp_prune_prsctp(struct sctp_tcb *stcb,
6161     struct sctp_association *asoc,
6162     struct sctp_sndrcvinfo *srcv,
6163     int dataout)
6164 {
6165         int freed_spc = 0;
6166         struct sctp_tmit_chunk *chk, *nchk;
6167
6168         SCTP_TCB_LOCK_ASSERT(stcb);
6169         if ((asoc->prsctp_supported) &&
6170             (asoc->sent_queue_cnt_removeable > 0)) {
6171                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6172                         /*
6173                          * Look for chunks marked with the PR_SCTP flag AND
6174                          * the buffer space flag. If the one being sent is
6175                          * equal or greater priority then purge the old one
6176                          * and free some space.
6177                          */
6178                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6179                                 /*
6180                                  * This one is PR-SCTP AND buffer space
6181                                  * limited type
6182                                  */
6183                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6184                                         /*
6185                                          * Lower numbers equates to higher
6186                                          * priority so if the one we are
6187                                          * looking at has a larger or equal
6188                                          * priority we want to drop the data
6189                                          * and NOT retransmit it.
6190                                          */
6191                                         if (chk->data) {
6192                                                 /*
6193                                                  * We release the book_size
6194                                                  * if the mbuf is here
6195                                                  */
6196                                                 int ret_spc;
6197                                                 uint8_t sent;
6198
6199                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6200                                                         sent = 1;
6201                                                 else
6202                                                         sent = 0;
6203                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6204                                                     sent,
6205                                                     SCTP_SO_LOCKED);
6206                                                 freed_spc += ret_spc;
6207                                                 if (freed_spc >= dataout) {
6208                                                         return;
6209                                                 }
6210                                         }       /* if chunk was present */
6211                                 }       /* if of sufficient priority */
6212                         }       /* if chunk has enabled */
6213                 }               /* tailqforeach */
6214
6215                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6216                         /* Here we must move to the sent queue and mark */
6217                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6218                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6219                                         if (chk->data) {
6220                                                 /*
6221                                                  * We release the book_size
6222                                                  * if the mbuf is here
6223                                                  */
6224                                                 int ret_spc;
6225
6226                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6227                                                     0, SCTP_SO_LOCKED);
6228
6229                                                 freed_spc += ret_spc;
6230                                                 if (freed_spc >= dataout) {
6231                                                         return;
6232                                                 }
6233                                         }       /* end if chk->data */
6234                                 }       /* end if right class */
6235                         }       /* end if chk pr-sctp */
6236                 }               /* tailqforeachsafe (chk) */
6237         }                       /* if enabled in asoc */
6238 }
6239
6240 int
6241 sctp_get_frag_point(struct sctp_tcb *stcb,
6242     struct sctp_association *asoc)
6243 {
6244         int siz, ovh;
6245
6246         /*
6247          * For endpoints that have both v6 and v4 addresses we must reserve
6248          * room for the ipv6 header, for those that are only dealing with V4
6249          * we use a larger frag point.
6250          */
6251         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6252                 ovh = SCTP_MIN_OVERHEAD;
6253         } else {
6254                 ovh = SCTP_MIN_V4_OVERHEAD;
6255         }
6256         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6257         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6258                 siz = asoc->smallest_mtu - ovh;
6259         else
6260                 siz = (stcb->asoc.sctp_frag_point - ovh);
6261         /*
6262          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6263          */
6264         /* A data chunk MUST fit in a cluster */
6265         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6266         /* } */
6267
6268         /* adjust for an AUTH chunk if DATA requires auth */
6269         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6270                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6271
6272         if (siz % 4) {
6273                 /* make it an even word boundary please */
6274                 siz -= (siz % 4);
6275         }
6276         return (siz);
6277 }
6278
6279 static void
6280 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6281 {
6282         /*
6283          * We assume that the user wants PR_SCTP_TTL if the user provides a
6284          * positive lifetime but does not specify any PR_SCTP policy.
6285          */
6286         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6287                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6288         } else if (sp->timetolive > 0) {
6289                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6290                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6291         } else {
6292                 return;
6293         }
6294         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6295         case CHUNK_FLAGS_PR_SCTP_BUF:
6296                 /*
6297                  * Time to live is a priority stored in tv_sec when doing
6298                  * the buffer drop thing.
6299                  */
6300                 sp->ts.tv_sec = sp->timetolive;
6301                 sp->ts.tv_usec = 0;
6302                 break;
6303         case CHUNK_FLAGS_PR_SCTP_TTL:
6304                 {
6305                         struct timeval tv;
6306
6307                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6308                         tv.tv_sec = sp->timetolive / 1000;
6309                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6310                         /*
6311                          * TODO sctp_constants.h needs alternative time
6312                          * macros when _KERNEL is undefined.
6313                          */
6314                         timevaladd(&sp->ts, &tv);
6315                 }
6316                 break;
6317         case CHUNK_FLAGS_PR_SCTP_RTX:
6318                 /*
6319                  * Time to live is a the number or retransmissions stored in
6320                  * tv_sec.
6321                  */
6322                 sp->ts.tv_sec = sp->timetolive;
6323                 sp->ts.tv_usec = 0;
6324                 break;
6325         default:
6326                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6327                     "Unknown PR_SCTP policy %u.\n",
6328                     PR_SCTP_POLICY(sp->sinfo_flags));
6329                 break;
6330         }
6331 }
6332
6333 static int
6334 sctp_msg_append(struct sctp_tcb *stcb,
6335     struct sctp_nets *net,
6336     struct mbuf *m,
6337     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6338 {
6339         int error = 0;
6340         struct mbuf *at;
6341         struct sctp_stream_queue_pending *sp = NULL;
6342         struct sctp_stream_out *strm;
6343
6344         /*
6345          * Given an mbuf chain, put it into the association send queue and
6346          * place it on the wheel
6347          */
6348         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6349                 /* Invalid stream number */
6350                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6351                 error = EINVAL;
6352                 goto out_now;
6353         }
6354         if ((stcb->asoc.stream_locked) &&
6355             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6356                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6357                 error = EINVAL;
6358                 goto out_now;
6359         }
6360         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6361         /* Now can we send this? */
6362         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6363             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6364             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6365             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6366                 /* got data while shutting down */
6367                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6368                 error = ECONNRESET;
6369                 goto out_now;
6370         }
6371         sctp_alloc_a_strmoq(stcb, sp);
6372         if (sp == NULL) {
6373                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6374                 error = ENOMEM;
6375                 goto out_now;
6376         }
6377         sp->sinfo_flags = srcv->sinfo_flags;
6378         sp->timetolive = srcv->sinfo_timetolive;
6379         sp->ppid = srcv->sinfo_ppid;
6380         sp->context = srcv->sinfo_context;
6381         sp->fsn = 0;
6382         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6383                 sp->net = net;
6384                 atomic_add_int(&sp->net->ref_count, 1);
6385         } else {
6386                 sp->net = NULL;
6387         }
6388         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6389         sp->sid = srcv->sinfo_stream;
6390         sp->msg_is_complete = 1;
6391         sp->sender_all_done = 1;
6392         sp->some_taken = 0;
6393         sp->data = m;
6394         sp->tail_mbuf = NULL;
6395         sctp_set_prsctp_policy(sp);
6396         /*
6397          * We could in theory (for sendall) sifa the length in, but we would
6398          * still have to hunt through the chain since we need to setup the
6399          * tail_mbuf
6400          */
6401         sp->length = 0;
6402         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6403                 if (SCTP_BUF_NEXT(at) == NULL)
6404                         sp->tail_mbuf = at;
6405                 sp->length += SCTP_BUF_LEN(at);
6406         }
6407         if (srcv->sinfo_keynumber_valid) {
6408                 sp->auth_keyid = srcv->sinfo_keynumber;
6409         } else {
6410                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6411         }
6412         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6413                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6414                 sp->holds_key_ref = 1;
6415         }
6416         if (hold_stcb_lock == 0) {
6417                 SCTP_TCB_SEND_LOCK(stcb);
6418         }
6419         sctp_snd_sb_alloc(stcb, sp->length);
6420         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6421         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6422         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6423         m = NULL;
6424         if (hold_stcb_lock == 0) {
6425                 SCTP_TCB_SEND_UNLOCK(stcb);
6426         }
6427 out_now:
6428         if (m) {
6429                 sctp_m_freem(m);
6430         }
6431         return (error);
6432 }
6433
6434
6435 static struct mbuf *
6436 sctp_copy_mbufchain(struct mbuf *clonechain,
6437     struct mbuf *outchain,
6438     struct mbuf **endofchain,
6439     int can_take_mbuf,
6440     int sizeofcpy,
6441     uint8_t copy_by_ref)
6442 {
6443         struct mbuf *m;
6444         struct mbuf *appendchain;
6445         caddr_t cp;
6446         int len;
6447
6448         if (endofchain == NULL) {
6449                 /* error */
6450 error_out:
6451                 if (outchain)
6452                         sctp_m_freem(outchain);
6453                 return (NULL);
6454         }
6455         if (can_take_mbuf) {
6456                 appendchain = clonechain;
6457         } else {
6458                 if (!copy_by_ref &&
6459                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6460                     ) {
6461                         /* Its not in a cluster */
6462                         if (*endofchain == NULL) {
6463                                 /* lets get a mbuf cluster */
6464                                 if (outchain == NULL) {
6465                                         /* This is the general case */
6466                         new_mbuf:
6467                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6468                                         if (outchain == NULL) {
6469                                                 goto error_out;
6470                                         }
6471                                         SCTP_BUF_LEN(outchain) = 0;
6472                                         *endofchain = outchain;
6473                                         /* get the prepend space */
6474                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6475                                 } else {
6476                                         /*
6477                                          * We really should not get a NULL
6478                                          * in endofchain
6479                                          */
6480                                         /* find end */
6481                                         m = outchain;
6482                                         while (m) {
6483                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6484                                                         *endofchain = m;
6485                                                         break;
6486                                                 }
6487                                                 m = SCTP_BUF_NEXT(m);
6488                                         }
6489                                         /* sanity */
6490                                         if (*endofchain == NULL) {
6491                                                 /*
6492                                                  * huh, TSNH XXX maybe we
6493                                                  * should panic
6494                                                  */
6495                                                 sctp_m_freem(outchain);
6496                                                 goto new_mbuf;
6497                                         }
6498                                 }
6499                                 /* get the new end of length */
6500                                 len = (int)M_TRAILINGSPACE(*endofchain);
6501                         } else {
6502                                 /* how much is left at the end? */
6503                                 len = (int)M_TRAILINGSPACE(*endofchain);
6504                         }
6505                         /* Find the end of the data, for appending */
6506                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6507
6508                         /* Now lets copy it out */
6509                         if (len >= sizeofcpy) {
6510                                 /* It all fits, copy it in */
6511                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6512                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6513                         } else {
6514                                 /* fill up the end of the chain */
6515                                 if (len > 0) {
6516                                         m_copydata(clonechain, 0, len, cp);
6517                                         SCTP_BUF_LEN((*endofchain)) += len;
6518                                         /* now we need another one */
6519                                         sizeofcpy -= len;
6520                                 }
6521                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6522                                 if (m == NULL) {
6523                                         /* We failed */
6524                                         goto error_out;
6525                                 }
6526                                 SCTP_BUF_NEXT((*endofchain)) = m;
6527                                 *endofchain = m;
6528                                 cp = mtod((*endofchain), caddr_t);
6529                                 m_copydata(clonechain, len, sizeofcpy, cp);
6530                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6531                         }
6532                         return (outchain);
6533                 } else {
6534                         /* copy the old fashion way */
6535                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6536 #ifdef SCTP_MBUF_LOGGING
6537                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6538                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6539                         }
6540 #endif
6541                 }
6542         }
6543         if (appendchain == NULL) {
6544                 /* error */
6545                 if (outchain)
6546                         sctp_m_freem(outchain);
6547                 return (NULL);
6548         }
6549         if (outchain) {
6550                 /* tack on to the end */
6551                 if (*endofchain != NULL) {
6552                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6553                 } else {
6554                         m = outchain;
6555                         while (m) {
6556                                 if (SCTP_BUF_NEXT(m) == NULL) {
6557                                         SCTP_BUF_NEXT(m) = appendchain;
6558                                         break;
6559                                 }
6560                                 m = SCTP_BUF_NEXT(m);
6561                         }
6562                 }
6563                 /*
6564                  * save off the end and update the end-chain position
6565                  */
6566                 m = appendchain;
6567                 while (m) {
6568                         if (SCTP_BUF_NEXT(m) == NULL) {
6569                                 *endofchain = m;
6570                                 break;
6571                         }
6572                         m = SCTP_BUF_NEXT(m);
6573                 }
6574                 return (outchain);
6575         } else {
6576                 /* save off the end and update the end-chain position */
6577                 m = appendchain;
6578                 while (m) {
6579                         if (SCTP_BUF_NEXT(m) == NULL) {
6580                                 *endofchain = m;
6581                                 break;
6582                         }
6583                         m = SCTP_BUF_NEXT(m);
6584                 }
6585                 return (appendchain);
6586         }
6587 }
6588
6589 static int
6590 sctp_med_chunk_output(struct sctp_inpcb *inp,
6591     struct sctp_tcb *stcb,
6592     struct sctp_association *asoc,
6593     int *num_out,
6594     int *reason_code,
6595     int control_only, int from_where,
6596     struct timeval *now, int *now_filled, int frag_point, int so_locked
6597 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6598     SCTP_UNUSED
6599 #endif
6600 );
6601
6602 static void
6603 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6604     uint32_t val SCTP_UNUSED)
6605 {
6606         struct sctp_copy_all *ca;
6607         struct mbuf *m;
6608         int ret = 0;
6609         int added_control = 0;
6610         int un_sent, do_chunk_output = 1;
6611         struct sctp_association *asoc;
6612         struct sctp_nets *net;
6613
6614         ca = (struct sctp_copy_all *)ptr;
6615         if (ca->m == NULL) {
6616                 return;
6617         }
6618         if (ca->inp != inp) {
6619                 /* TSNH */
6620                 return;
6621         }
6622         if (ca->sndlen > 0) {
6623                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6624                 if (m == NULL) {
6625                         /* can't copy so we are done */
6626                         ca->cnt_failed++;
6627                         return;
6628                 }
6629 #ifdef SCTP_MBUF_LOGGING
6630                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6631                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6632                 }
6633 #endif
6634         } else {
6635                 m = NULL;
6636         }
6637         SCTP_TCB_LOCK_ASSERT(stcb);
6638         if (stcb->asoc.alternate) {
6639                 net = stcb->asoc.alternate;
6640         } else {
6641                 net = stcb->asoc.primary_destination;
6642         }
6643         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6644                 /* Abort this assoc with m as the user defined reason */
6645                 if (m != NULL) {
6646                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6647                 } else {
6648                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6649                             0, M_NOWAIT, 1, MT_DATA);
6650                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6651                 }
6652                 if (m != NULL) {
6653                         struct sctp_paramhdr *ph;
6654
6655                         ph = mtod(m, struct sctp_paramhdr *);
6656                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6657                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6658                 }
6659                 /*
6660                  * We add one here to keep the assoc from dis-appearing on
6661                  * us.
6662                  */
6663                 atomic_add_int(&stcb->asoc.refcnt, 1);
6664                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6665                 /*
6666                  * sctp_abort_an_association calls sctp_free_asoc() free
6667                  * association will NOT free it since we incremented the
6668                  * refcnt .. we do this to prevent it being freed and things
6669                  * getting tricky since we could end up (from free_asoc)
6670                  * calling inpcb_free which would get a recursive lock call
6671                  * to the iterator lock.. But as a consequence of that the
6672                  * stcb will return to us un-locked.. since free_asoc
6673                  * returns with either no TCB or the TCB unlocked, we must
6674                  * relock.. to unlock in the iterator timer :-0
6675                  */
6676                 SCTP_TCB_LOCK(stcb);
6677                 atomic_add_int(&stcb->asoc.refcnt, -1);
6678                 goto no_chunk_output;
6679         } else {
6680                 if (m) {
6681                         ret = sctp_msg_append(stcb, net, m,
6682                             &ca->sndrcv, 1);
6683                 }
6684                 asoc = &stcb->asoc;
6685                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6686                         /* shutdown this assoc */
6687                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6688                             TAILQ_EMPTY(&asoc->sent_queue) &&
6689                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6690                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6691                                         goto abort_anyway;
6692                                 }
6693                                 /*
6694                                  * there is nothing queued to send, so I'm
6695                                  * done...
6696                                  */
6697                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6698                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6699                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6700                                         /*
6701                                          * only send SHUTDOWN the first time
6702                                          * through
6703                                          */
6704                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6705                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6706                                         }
6707                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6708                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6709                                         sctp_stop_timers_for_shutdown(stcb);
6710                                         sctp_send_shutdown(stcb, net);
6711                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6712                                             net);
6713                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6714                                             asoc->primary_destination);
6715                                         added_control = 1;
6716                                         do_chunk_output = 0;
6717                                 }
6718                         } else {
6719                                 /*
6720                                  * we still got (or just got) data to send,
6721                                  * so set SHUTDOWN_PENDING
6722                                  */
6723                                 /*
6724                                  * XXX sockets draft says that SCTP_EOF
6725                                  * should be sent with no data.  currently,
6726                                  * we will allow user data to be sent first
6727                                  * and move to SHUTDOWN-PENDING
6728                                  */
6729                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6730                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6731                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6732                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6733                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6734                                         }
6735                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6736                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6737                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6738                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6739                                                 struct mbuf *op_err;
6740                                                 char msg[SCTP_DIAG_INFO_LEN];
6741
6742                                 abort_anyway:
6743                                                 snprintf(msg, sizeof(msg),
6744                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6745                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6746                                                     msg);
6747                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6748                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6749                                                     op_err, SCTP_SO_NOT_LOCKED);
6750                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6751                                                 goto no_chunk_output;
6752                                         }
6753                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6754                                             asoc->primary_destination);
6755                                 }
6756                         }
6757
6758                 }
6759         }
6760         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6761             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6762
6763         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6764             (stcb->asoc.total_flight > 0) &&
6765             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6766                 do_chunk_output = 0;
6767         }
6768         if (do_chunk_output)
6769                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6770         else if (added_control) {
6771                 int num_out, reason, now_filled = 0;
6772                 struct timeval now;
6773                 int frag_point;
6774
6775                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6776                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6777                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6778         }
6779 no_chunk_output:
6780         if (ret) {
6781                 ca->cnt_failed++;
6782         } else {
6783                 ca->cnt_sent++;
6784         }
6785 }
6786
6787 static void
6788 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6789 {
6790         struct sctp_copy_all *ca;
6791
6792         ca = (struct sctp_copy_all *)ptr;
6793         /*
6794          * Do a notify here? Kacheong suggests that the notify be done at
6795          * the send time.. so you would push up a notification if any send
6796          * failed. Don't know if this is feasible since the only failures we
6797          * have is "memory" related and if you cannot get an mbuf to send
6798          * the data you surely can't get an mbuf to send up to notify the
6799          * user you can't send the data :->
6800          */
6801
6802         /* now free everything */
6803         sctp_m_freem(ca->m);
6804         SCTP_FREE(ca, SCTP_M_COPYAL);
6805 }
6806
6807 static struct mbuf *
6808 sctp_copy_out_all(struct uio *uio, int len)
6809 {
6810         struct mbuf *ret, *at;
6811         int left, willcpy, cancpy, error;
6812
6813         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6814         if (ret == NULL) {
6815                 /* TSNH */
6816                 return (NULL);
6817         }
6818         left = len;
6819         SCTP_BUF_LEN(ret) = 0;
6820         /* save space for the data chunk header */
6821         cancpy = (int)M_TRAILINGSPACE(ret);
6822         willcpy = min(cancpy, left);
6823         at = ret;
6824         while (left > 0) {
6825                 /* Align data to the end */
6826                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6827                 if (error) {
6828         err_out_now:
6829                         sctp_m_freem(at);
6830                         return (NULL);
6831                 }
6832                 SCTP_BUF_LEN(at) = willcpy;
6833                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6834                 left -= willcpy;
6835                 if (left > 0) {
6836                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6837                         if (SCTP_BUF_NEXT(at) == NULL) {
6838                                 goto err_out_now;
6839                         }
6840                         at = SCTP_BUF_NEXT(at);
6841                         SCTP_BUF_LEN(at) = 0;
6842                         cancpy = (int)M_TRAILINGSPACE(at);
6843                         willcpy = min(cancpy, left);
6844                 }
6845         }
6846         return (ret);
6847 }
6848
6849 static int
6850 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6851     struct sctp_sndrcvinfo *srcv)
6852 {
6853         int ret;
6854         struct sctp_copy_all *ca;
6855
6856         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6857             SCTP_M_COPYAL);
6858         if (ca == NULL) {
6859                 sctp_m_freem(m);
6860                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6861                 return (ENOMEM);
6862         }
6863         memset(ca, 0, sizeof(struct sctp_copy_all));
6864
6865         ca->inp = inp;
6866         if (srcv) {
6867                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6868         }
6869         /*
6870          * take off the sendall flag, it would be bad if we failed to do
6871          * this :-0
6872          */
6873         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6874         /* get length and mbuf chain */
6875         if (uio) {
6876                 ca->sndlen = (int)uio->uio_resid;
6877                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6878                 if (ca->m == NULL) {
6879                         SCTP_FREE(ca, SCTP_M_COPYAL);
6880                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6881                         return (ENOMEM);
6882                 }
6883         } else {
6884                 /* Gather the length of the send */
6885                 struct mbuf *mat;
6886
6887                 ca->sndlen = 0;
6888                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6889                         ca->sndlen += SCTP_BUF_LEN(mat);
6890                 }
6891         }
6892         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6893             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6894             SCTP_ASOC_ANY_STATE,
6895             (void *)ca, 0,
6896             sctp_sendall_completes, inp, 1);
6897         if (ret) {
6898                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6899                 SCTP_FREE(ca, SCTP_M_COPYAL);
6900                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6901                 return (EFAULT);
6902         }
6903         return (0);
6904 }
6905
6906
6907 void
6908 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6909 {
6910         struct sctp_tmit_chunk *chk, *nchk;
6911
6912         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6913                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6914                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6915                         if (chk->data) {
6916                                 sctp_m_freem(chk->data);
6917                                 chk->data = NULL;
6918                         }
6919                         asoc->ctrl_queue_cnt--;
6920                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6921                 }
6922         }
6923 }
6924
6925 void
6926 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6927 {
6928         struct sctp_association *asoc;
6929         struct sctp_tmit_chunk *chk, *nchk;
6930         struct sctp_asconf_chunk *acp;
6931
6932         asoc = &stcb->asoc;
6933         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6934                 /* find SCTP_ASCONF chunk in queue */
6935                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6936                         if (chk->data) {
6937                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6938                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6939                                         /* Not Acked yet */
6940                                         break;
6941                                 }
6942                         }
6943                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6944                         if (chk->data) {
6945                                 sctp_m_freem(chk->data);
6946                                 chk->data = NULL;
6947                         }
6948                         asoc->ctrl_queue_cnt--;
6949                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6950                 }
6951         }
6952 }
6953
6954
6955 static void
6956 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6957     struct sctp_association *asoc,
6958     struct sctp_tmit_chunk **data_list,
6959     int bundle_at,
6960     struct sctp_nets *net)
6961 {
6962         int i;
6963         struct sctp_tmit_chunk *tp1;
6964
6965         for (i = 0; i < bundle_at; i++) {
6966                 /* off of the send queue */
6967                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6968                 asoc->send_queue_cnt--;
6969                 if (i > 0) {
6970                         /*
6971                          * Any chunk NOT 0 you zap the time chunk 0 gets
6972                          * zapped or set based on if a RTO measurment is
6973                          * needed.
6974                          */
6975                         data_list[i]->do_rtt = 0;
6976                 }
6977                 /* record time */
6978                 data_list[i]->sent_rcv_time = net->last_sent_time;
6979                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6980                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6981                 if (data_list[i]->whoTo == NULL) {
6982                         data_list[i]->whoTo = net;
6983                         atomic_add_int(&net->ref_count, 1);
6984                 }
6985                 /* on to the sent queue */
6986                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6987                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6988                         struct sctp_tmit_chunk *tpp;
6989
6990                         /* need to move back */
6991         back_up_more:
6992                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6993                         if (tpp == NULL) {
6994                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6995                                 goto all_done;
6996                         }
6997                         tp1 = tpp;
6998                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6999                                 goto back_up_more;
7000                         }
7001                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7002                 } else {
7003                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7004                             data_list[i],
7005                             sctp_next);
7006                 }
7007 all_done:
7008                 /* This does not lower until the cum-ack passes it */
7009                 asoc->sent_queue_cnt++;
7010                 if ((asoc->peers_rwnd <= 0) &&
7011                     (asoc->total_flight == 0) &&
7012                     (bundle_at == 1)) {
7013                         /* Mark the chunk as being a window probe */
7014                         SCTP_STAT_INCR(sctps_windowprobed);
7015                 }
7016 #ifdef SCTP_AUDITING_ENABLED
7017                 sctp_audit_log(0xC2, 3);
7018 #endif
7019                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7020                 data_list[i]->snd_count = 1;
7021                 data_list[i]->rec.data.chunk_was_revoked = 0;
7022                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7023                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7024                             data_list[i]->whoTo->flight_size,
7025                             data_list[i]->book_size,
7026                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7027                             data_list[i]->rec.data.tsn);
7028                 }
7029                 sctp_flight_size_increase(data_list[i]);
7030                 sctp_total_flight_increase(stcb, data_list[i]);
7031                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7032                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7033                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7034                 }
7035                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7036                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7037                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7038                         /* SWS sender side engages */
7039                         asoc->peers_rwnd = 0;
7040                 }
7041         }
7042         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7043                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7044         }
7045 }
7046
7047 static void
7048 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7049 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7050     SCTP_UNUSED
7051 #endif
7052 )
7053 {
7054         struct sctp_tmit_chunk *chk, *nchk;
7055
7056         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7057                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7058                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7059                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7060                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7061                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7062                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7063                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7064                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7065                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7066                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7067                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7068                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7069                         /* Stray chunks must be cleaned up */
7070         clean_up_anyway:
7071                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7072                         if (chk->data) {
7073                                 sctp_m_freem(chk->data);
7074                                 chk->data = NULL;
7075                         }
7076                         asoc->ctrl_queue_cnt--;
7077                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7078                                 asoc->fwd_tsn_cnt--;
7079                         sctp_free_a_chunk(stcb, chk, so_locked);
7080                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7081                         /* special handling, we must look into the param */
7082                         if (chk != asoc->str_reset) {
7083                                 goto clean_up_anyway;
7084                         }
7085                 }
7086         }
7087 }
7088
7089 static uint32_t
7090 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7091     uint32_t space_left, uint32_t frag_point, int eeor_on)
7092 {
7093         /*
7094          * Make a decision on if I should split a msg into multiple parts.
7095          * This is only asked of incomplete messages.
7096          */
7097         if (eeor_on) {
7098                 /*
7099                  * If we are doing EEOR we need to always send it if its the
7100                  * entire thing, since it might be all the guy is putting in
7101                  * the hopper.
7102                  */
7103                 if (space_left >= length) {
7104                         /*-
7105                          * If we have data outstanding,
7106                          * we get another chance when the sack
7107                          * arrives to transmit - wait for more data
7108                          */
7109                         if (stcb->asoc.total_flight == 0) {
7110                                 /*
7111                                  * If nothing is in flight, we zero the
7112                                  * packet counter.
7113                                  */
7114                                 return (length);
7115                         }
7116                         return (0);
7117
7118                 } else {
7119                         /* You can fill the rest */
7120                         return (space_left);
7121                 }
7122         }
7123         /*-
7124          * For those strange folk that make the send buffer
7125          * smaller than our fragmentation point, we can't
7126          * get a full msg in so we have to allow splitting.
7127          */
7128         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7129                 return (length);
7130         }
7131         if ((length <= space_left) ||
7132             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7133                 /* Sub-optimial residual don't split in non-eeor mode. */
7134                 return (0);
7135         }
7136         /*
7137          * If we reach here length is larger than the space_left. Do we wish
7138          * to split it for the sake of packet putting together?
7139          */
7140         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7141                 /* Its ok to split it */
7142                 return (min(space_left, frag_point));
7143         }
7144         /* Nope, can't split */
7145         return (0);
7146 }
7147
7148 static uint32_t
7149 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7150     struct sctp_stream_out *strq,
7151     uint32_t space_left,
7152     uint32_t frag_point,
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 = NULL;
7167         struct sctp_idata_chunk *ndchkh = NULL;
7168         uint32_t to_move, length;
7169         int leading;
7170         uint8_t rcv_flags = 0;
7171         uint8_t some_taken;
7172         uint8_t send_lock_up = 0;
7173
7174         SCTP_TCB_LOCK_ASSERT(stcb);
7175         asoc = &stcb->asoc;
7176 one_more_time:
7177         /* sa_ignore FREED_MEMORY */
7178         sp = TAILQ_FIRST(&strq->outqueue);
7179         if (sp == NULL) {
7180                 if (send_lock_up == 0) {
7181                         SCTP_TCB_SEND_LOCK(stcb);
7182                         send_lock_up = 1;
7183                 }
7184                 sp = TAILQ_FIRST(&strq->outqueue);
7185                 if (sp) {
7186                         goto one_more_time;
7187                 }
7188                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7189                     (stcb->asoc.idata_supported == 0) &&
7190                     (strq->last_msg_incomplete)) {
7191                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7192                             strq->sid,
7193                             strq->last_msg_incomplete);
7194                         strq->last_msg_incomplete = 0;
7195                 }
7196                 to_move = 0;
7197                 if (send_lock_up) {
7198                         SCTP_TCB_SEND_UNLOCK(stcb);
7199                         send_lock_up = 0;
7200                 }
7201                 goto out_of;
7202         }
7203         if ((sp->msg_is_complete) && (sp->length == 0)) {
7204                 if (sp->sender_all_done) {
7205                         /*
7206                          * We are doing differed cleanup. Last time through
7207                          * when we took all the data the sender_all_done was
7208                          * not set.
7209                          */
7210                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7211                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7212                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7213                                     sp->sender_all_done,
7214                                     sp->length,
7215                                     sp->msg_is_complete,
7216                                     sp->put_last_out,
7217                                     send_lock_up);
7218                         }
7219                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7220                                 SCTP_TCB_SEND_LOCK(stcb);
7221                                 send_lock_up = 1;
7222                         }
7223                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7224                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7225                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7226                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7227                             (strq->chunks_on_queues == 0) &&
7228                             TAILQ_EMPTY(&strq->outqueue)) {
7229                                 stcb->asoc.trigger_reset = 1;
7230                         }
7231                         if (sp->net) {
7232                                 sctp_free_remote_addr(sp->net);
7233                                 sp->net = NULL;
7234                         }
7235                         if (sp->data) {
7236                                 sctp_m_freem(sp->data);
7237                                 sp->data = NULL;
7238                         }
7239                         sctp_free_a_strmoq(stcb, sp, so_locked);
7240                         /* we can't be locked to it */
7241                         if (send_lock_up) {
7242                                 SCTP_TCB_SEND_UNLOCK(stcb);
7243                                 send_lock_up = 0;
7244                         }
7245                         /* back to get the next msg */
7246                         goto one_more_time;
7247                 } else {
7248                         /*
7249                          * sender just finished this but still holds a
7250                          * reference
7251                          */
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                         *giveup = 1;
7261                         to_move = 0;
7262                         goto out_of;
7263                 } else if (sp->discard_rest) {
7264                         if (send_lock_up == 0) {
7265                                 SCTP_TCB_SEND_LOCK(stcb);
7266                                 send_lock_up = 1;
7267                         }
7268                         /* Whack down the size */
7269                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7270                         if ((stcb->sctp_socket != NULL) &&
7271                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7272                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7273                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7274                         }
7275                         if (sp->data) {
7276                                 sctp_m_freem(sp->data);
7277                                 sp->data = NULL;
7278                                 sp->tail_mbuf = NULL;
7279                         }
7280                         sp->length = 0;
7281                         sp->some_taken = 1;
7282                         *giveup = 1;
7283                         to_move = 0;
7284                         goto out_of;
7285                 }
7286         }
7287         some_taken = sp->some_taken;
7288 re_look:
7289         length = sp->length;
7290         if (sp->msg_is_complete) {
7291                 /* The message is complete */
7292                 to_move = min(length, frag_point);
7293                 if (to_move == length) {
7294                         /* All of it fits in the MTU */
7295                         if (sp->some_taken) {
7296                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7297                         } else {
7298                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7299                         }
7300                         sp->put_last_out = 1;
7301                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7302                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
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, space_left, 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                         *giveup = 1;
7346                         to_move = 0;
7347                         goto out_of;
7348                 }
7349         }
7350
7351         /* If we reach here, we can copy out a chunk */
7352         sctp_alloc_a_chunk(stcb, chk);
7353         if (chk == NULL) {
7354                 /* No chunk memory */
7355                 *giveup = 1;
7356                 to_move = 0;
7357                 goto out_of;
7358         }
7359         /*
7360          * Setup for unordered if needed by looking at the user sent info
7361          * flags.
7362          */
7363         if (sp->sinfo_flags & SCTP_UNORDERED) {
7364                 rcv_flags |= SCTP_DATA_UNORDERED;
7365         }
7366         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7367             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7368                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7369         }
7370         /* clear out the chunk before setting up */
7371         memset(chk, 0, sizeof(*chk));
7372         chk->rec.data.rcv_flags = rcv_flags;
7373
7374         if (to_move >= length) {
7375                 /* we think we can steal the whole thing */
7376                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7377                         SCTP_TCB_SEND_LOCK(stcb);
7378                         send_lock_up = 1;
7379                 }
7380                 if (to_move < sp->length) {
7381                         /* bail, it changed */
7382                         goto dont_do_it;
7383                 }
7384                 chk->data = sp->data;
7385                 chk->last_mbuf = sp->tail_mbuf;
7386                 /* register the stealing */
7387                 sp->data = sp->tail_mbuf = NULL;
7388         } else {
7389                 struct mbuf *m;
7390
7391 dont_do_it:
7392                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7393                 chk->last_mbuf = NULL;
7394                 if (chk->data == NULL) {
7395                         sp->some_taken = some_taken;
7396                         sctp_free_a_chunk(stcb, chk, so_locked);
7397                         *bail = 1;
7398                         to_move = 0;
7399                         goto out_of;
7400                 }
7401 #ifdef SCTP_MBUF_LOGGING
7402                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7403                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7404                 }
7405 #endif
7406                 /* Pull off the data */
7407                 m_adj(sp->data, to_move);
7408                 /* Now lets work our way down and compact it */
7409                 m = sp->data;
7410                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7411                         sp->data = SCTP_BUF_NEXT(m);
7412                         SCTP_BUF_NEXT(m) = NULL;
7413                         if (sp->tail_mbuf == m) {
7414                                 /*-
7415                                  * Freeing tail? TSNH since
7416                                  * we supposedly were taking less
7417                                  * than the sp->length.
7418                                  */
7419 #ifdef INVARIANTS
7420                                 panic("Huh, freing tail? - TSNH");
7421 #else
7422                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7423                                 sp->tail_mbuf = sp->data = NULL;
7424                                 sp->length = 0;
7425 #endif
7426
7427                         }
7428                         sctp_m_free(m);
7429                         m = sp->data;
7430                 }
7431         }
7432         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7433                 chk->copy_by_ref = 1;
7434         } else {
7435                 chk->copy_by_ref = 0;
7436         }
7437         /*
7438          * get last_mbuf and counts of mb usage This is ugly but hopefully
7439          * its only one mbuf.
7440          */
7441         if (chk->last_mbuf == NULL) {
7442                 chk->last_mbuf = chk->data;
7443                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7444                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7445                 }
7446         }
7447         if (to_move > length) {
7448                 /*- This should not happen either
7449                  * since we always lower to_move to the size
7450                  * of sp->length if its larger.
7451                  */
7452 #ifdef INVARIANTS
7453                 panic("Huh, how can to_move be larger?");
7454 #else
7455                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7456                 sp->length = 0;
7457 #endif
7458         } else {
7459                 atomic_subtract_int(&sp->length, to_move);
7460         }
7461         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7462         if (M_LEADINGSPACE(chk->data) < leading) {
7463                 /* Not enough room for a chunk header, get some */
7464                 struct mbuf *m;
7465
7466                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7467                 if (m == NULL) {
7468                         /*
7469                          * we're in trouble here. _PREPEND below will free
7470                          * all the data if there is no leading space, so we
7471                          * must put the data back and restore.
7472                          */
7473                         if (send_lock_up == 0) {
7474                                 SCTP_TCB_SEND_LOCK(stcb);
7475                                 send_lock_up = 1;
7476                         }
7477                         if (sp->data == NULL) {
7478                                 /* unsteal the data */
7479                                 sp->data = chk->data;
7480                                 sp->tail_mbuf = chk->last_mbuf;
7481                         } else {
7482                                 struct mbuf *m_tmp;
7483
7484                                 /* reassemble the data */
7485                                 m_tmp = sp->data;
7486                                 sp->data = chk->data;
7487                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7488                         }
7489                         sp->some_taken = some_taken;
7490                         atomic_add_int(&sp->length, to_move);
7491                         chk->data = NULL;
7492                         *bail = 1;
7493                         sctp_free_a_chunk(stcb, chk, so_locked);
7494                         to_move = 0;
7495                         goto out_of;
7496                 } else {
7497                         SCTP_BUF_LEN(m) = 0;
7498                         SCTP_BUF_NEXT(m) = chk->data;
7499                         chk->data = m;
7500                         M_ALIGN(chk->data, 4);
7501                 }
7502         }
7503         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7504         if (chk->data == NULL) {
7505                 /* HELP, TSNH since we assured it would not above? */
7506 #ifdef INVARIANTS
7507                 panic("prepend failes HELP?");
7508 #else
7509                 SCTP_PRINTF("prepend fails HELP?\n");
7510                 sctp_free_a_chunk(stcb, chk, so_locked);
7511 #endif
7512                 *bail = 1;
7513                 to_move = 0;
7514                 goto out_of;
7515         }
7516         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7517         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7518         chk->book_size_scale = 0;
7519         chk->sent = SCTP_DATAGRAM_UNSENT;
7520
7521         chk->flags = 0;
7522         chk->asoc = &stcb->asoc;
7523         chk->pad_inplace = 0;
7524         chk->no_fr_allowed = 0;
7525         if (stcb->asoc.idata_supported == 0) {
7526                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7527                         /* Just use 0. The receiver ignores the values. */
7528                         chk->rec.data.mid = 0;
7529                 } else {
7530                         chk->rec.data.mid = strq->next_mid_ordered;
7531                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7532                                 strq->next_mid_ordered++;
7533                         }
7534                 }
7535         } else {
7536                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7537                         chk->rec.data.mid = strq->next_mid_unordered;
7538                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7539                                 strq->next_mid_unordered++;
7540                         }
7541                 } else {
7542                         chk->rec.data.mid = strq->next_mid_ordered;
7543                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7544                                 strq->next_mid_ordered++;
7545                         }
7546                 }
7547         }
7548         chk->rec.data.sid = sp->sid;
7549         chk->rec.data.ppid = sp->ppid;
7550         chk->rec.data.context = sp->context;
7551         chk->rec.data.doing_fast_retransmit = 0;
7552
7553         chk->rec.data.timetodrop = sp->ts;
7554         chk->flags = sp->act_flags;
7555
7556         if (sp->net) {
7557                 chk->whoTo = sp->net;
7558                 atomic_add_int(&chk->whoTo->ref_count, 1);
7559         } else
7560                 chk->whoTo = NULL;
7561
7562         if (sp->holds_key_ref) {
7563                 chk->auth_keyid = sp->auth_keyid;
7564                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7565                 chk->holds_key_ref = 1;
7566         }
7567         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7568         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7569                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7570                     (uint32_t)(uintptr_t)stcb, sp->length,
7571                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7572                     chk->rec.data.tsn);
7573         }
7574         if (stcb->asoc.idata_supported == 0) {
7575                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7576         } else {
7577                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7578         }
7579         /*
7580          * Put the rest of the things in place now. Size was done earlier in
7581          * previous loop prior to padding.
7582          */
7583
7584 #ifdef SCTP_ASOCLOG_OF_TSNS
7585         SCTP_TCB_LOCK_ASSERT(stcb);
7586         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7587                 asoc->tsn_out_at = 0;
7588                 asoc->tsn_out_wrapped = 1;
7589         }
7590         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7591         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7592         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7593         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7594         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7595         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7596         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7597         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7598         asoc->tsn_out_at++;
7599 #endif
7600         if (stcb->asoc.idata_supported == 0) {
7601                 dchkh->ch.chunk_type = SCTP_DATA;
7602                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7603                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7604                 dchkh->dp.sid = htons(strq->sid);
7605                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7606                 dchkh->dp.ppid = chk->rec.data.ppid;
7607                 dchkh->ch.chunk_length = htons(chk->send_size);
7608         } else {
7609                 ndchkh->ch.chunk_type = SCTP_IDATA;
7610                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7611                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7612                 ndchkh->dp.sid = htons(strq->sid);
7613                 ndchkh->dp.reserved = htons(0);
7614                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7615                 if (sp->fsn == 0)
7616                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7617                 else
7618                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7619                 sp->fsn++;
7620                 ndchkh->ch.chunk_length = htons(chk->send_size);
7621         }
7622         /* Now advance the chk->send_size by the actual pad needed. */
7623         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7624                 /* need a pad */
7625                 struct mbuf *lm;
7626                 int pads;
7627
7628                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7629                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7630                 if (lm != NULL) {
7631                         chk->last_mbuf = lm;
7632                         chk->pad_inplace = 1;
7633                 }
7634                 chk->send_size += pads;
7635         }
7636         if (PR_SCTP_ENABLED(chk->flags)) {
7637                 asoc->pr_sctp_cnt++;
7638         }
7639         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7640                 /* All done pull and kill the message */
7641                 if (sp->put_last_out == 0) {
7642                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7643                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7644                             sp->sender_all_done,
7645                             sp->length,
7646                             sp->msg_is_complete,
7647                             sp->put_last_out,
7648                             send_lock_up);
7649                 }
7650                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7651                         SCTP_TCB_SEND_LOCK(stcb);
7652                         send_lock_up = 1;
7653                 }
7654                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7655                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7656                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7657                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7658                     (strq->chunks_on_queues == 0) &&
7659                     TAILQ_EMPTY(&strq->outqueue)) {
7660                         stcb->asoc.trigger_reset = 1;
7661                 }
7662                 if (sp->net) {
7663                         sctp_free_remote_addr(sp->net);
7664                         sp->net = NULL;
7665                 }
7666                 if (sp->data) {
7667                         sctp_m_freem(sp->data);
7668                         sp->data = NULL;
7669                 }
7670                 sctp_free_a_strmoq(stcb, sp, so_locked);
7671         }
7672         asoc->chunks_on_out_queue++;
7673         strq->chunks_on_queues++;
7674         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7675         asoc->send_queue_cnt++;
7676 out_of:
7677         if (send_lock_up) {
7678                 SCTP_TCB_SEND_UNLOCK(stcb);
7679         }
7680         return (to_move);
7681 }
7682
7683
7684 static void
7685 sctp_fill_outqueue(struct sctp_tcb *stcb,
7686     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7687 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7688     SCTP_UNUSED
7689 #endif
7690 )
7691 {
7692         struct sctp_association *asoc;
7693         struct sctp_stream_out *strq;
7694         uint32_t space_left, moved, total_moved;
7695         int bail, giveup;
7696
7697         SCTP_TCB_LOCK_ASSERT(stcb);
7698         asoc = &stcb->asoc;
7699         total_moved = 0;
7700         switch (net->ro._l_addr.sa.sa_family) {
7701 #ifdef INET
7702         case AF_INET:
7703                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7704                 break;
7705 #endif
7706 #ifdef INET6
7707         case AF_INET6:
7708                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7709                 break;
7710 #endif
7711         default:
7712                 /* TSNH */
7713                 space_left = net->mtu;
7714                 break;
7715         }
7716         /* Need an allowance for the data chunk header too */
7717         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7718
7719         /* must make even word boundary */
7720         space_left &= 0xfffffffc;
7721         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7722         giveup = 0;
7723         bail = 0;
7724         while ((space_left > 0) && (strq != NULL)) {
7725                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7726                     &giveup, eeor_mode, &bail, so_locked);
7727                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7728                 if ((giveup != 0) || (bail != 0)) {
7729                         break;
7730                 }
7731                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7732                 total_moved += moved;
7733                 space_left -= moved;
7734                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7735                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7736                 } else {
7737                         space_left = 0;
7738                 }
7739                 space_left &= 0xfffffffc;
7740         }
7741         if (bail != 0)
7742                 *quit_now = 1;
7743
7744         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7745
7746         if (total_moved == 0) {
7747                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7748                     (net == stcb->asoc.primary_destination)) {
7749                         /* ran dry for primary network net */
7750                         SCTP_STAT_INCR(sctps_primary_randry);
7751                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7752                         /* ran dry with CMT on */
7753                         SCTP_STAT_INCR(sctps_cmt_randry);
7754                 }
7755         }
7756 }
7757
7758 void
7759 sctp_fix_ecn_echo(struct sctp_association *asoc)
7760 {
7761         struct sctp_tmit_chunk *chk;
7762
7763         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7764                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7765                         chk->sent = SCTP_DATAGRAM_UNSENT;
7766                 }
7767         }
7768 }
7769
7770 void
7771 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7772 {
7773         struct sctp_association *asoc;
7774         struct sctp_tmit_chunk *chk;
7775         struct sctp_stream_queue_pending *sp;
7776         unsigned int i;
7777
7778         if (net == NULL) {
7779                 return;
7780         }
7781         asoc = &stcb->asoc;
7782         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7783                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7784                         if (sp->net == net) {
7785                                 sctp_free_remote_addr(sp->net);
7786                                 sp->net = NULL;
7787                         }
7788                 }
7789         }
7790         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7791                 if (chk->whoTo == net) {
7792                         sctp_free_remote_addr(chk->whoTo);
7793                         chk->whoTo = NULL;
7794                 }
7795         }
7796 }
7797
7798 int
7799 sctp_med_chunk_output(struct sctp_inpcb *inp,
7800     struct sctp_tcb *stcb,
7801     struct sctp_association *asoc,
7802     int *num_out,
7803     int *reason_code,
7804     int control_only, int from_where,
7805     struct timeval *now, int *now_filled, int frag_point, int so_locked
7806 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7807     SCTP_UNUSED
7808 #endif
7809 )
7810 {
7811         /**
7812          * Ok this is the generic chunk service queue. we must do the
7813          * following:
7814          * - Service the stream queue that is next, moving any
7815          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7816          *   LAST to the out queue in one pass) and assigning TSN's. This
7817          *   only applys though if the peer does not support NDATA. For NDATA
7818          *   chunks its ok to not send the entire message ;-)
7819          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7820          *   fomulate and send the low level chunks. Making sure to combine
7821          *   any control in the control chunk queue also.
7822          */
7823         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7824         struct mbuf *outchain, *endoutchain;
7825         struct sctp_tmit_chunk *chk, *nchk;
7826
7827         /* temp arrays for unlinking */
7828         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7829         int no_fragmentflg, error;
7830         unsigned int max_rwnd_per_dest, max_send_per_dest;
7831         int one_chunk, hbflag, skip_data_for_this_net;
7832         int asconf, cookie, no_out_cnt;
7833         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7834         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7835         int tsns_sent = 0;
7836         uint32_t auth_offset = 0;
7837         struct sctp_auth_chunk *auth = NULL;
7838         uint16_t auth_keyid;
7839         int override_ok = 1;
7840         int skip_fill_up = 0;
7841         int data_auth_reqd = 0;
7842
7843         /*
7844          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7845          * destination.
7846          */
7847         int quit_now = 0;
7848
7849         *num_out = 0;
7850         *reason_code = 0;
7851         auth_keyid = stcb->asoc.authinfo.active_keyid;
7852         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7853             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7854             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7855                 eeor_mode = 1;
7856         } else {
7857                 eeor_mode = 0;
7858         }
7859         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7860         /*
7861          * First lets prime the pump. For each destination, if there is room
7862          * in the flight size, attempt to pull an MTU's worth out of the
7863          * stream queues into the general send_queue
7864          */
7865 #ifdef SCTP_AUDITING_ENABLED
7866         sctp_audit_log(0xC2, 2);
7867 #endif
7868         SCTP_TCB_LOCK_ASSERT(stcb);
7869         hbflag = 0;
7870         if (control_only)
7871                 no_data_chunks = 1;
7872         else
7873                 no_data_chunks = 0;
7874
7875         /* Nothing to possible to send? */
7876         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7877             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7878             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7879             TAILQ_EMPTY(&asoc->send_queue) &&
7880             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7881 nothing_to_send:
7882                 *reason_code = 9;
7883                 return (0);
7884         }
7885         if (asoc->peers_rwnd == 0) {
7886                 /* No room in peers rwnd */
7887                 *reason_code = 1;
7888                 if (asoc->total_flight > 0) {
7889                         /* we are allowed one chunk in flight */
7890                         no_data_chunks = 1;
7891                 }
7892         }
7893         if (stcb->asoc.ecn_echo_cnt_onq) {
7894                 /* Record where a sack goes, if any */
7895                 if (no_data_chunks &&
7896                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7897                         /* Nothing but ECNe to send - we don't do that */
7898                         goto nothing_to_send;
7899                 }
7900                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7901                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7902                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7903                                 sack_goes_to = chk->whoTo;
7904                                 break;
7905                         }
7906                 }
7907         }
7908         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7909         if (stcb->sctp_socket)
7910                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7911         else
7912                 max_send_per_dest = 0;
7913         if (no_data_chunks == 0) {
7914                 /* How many non-directed chunks are there? */
7915                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7916                         if (chk->whoTo == NULL) {
7917                                 /*
7918                                  * We already have non-directed chunks on
7919                                  * the queue, no need to do a fill-up.
7920                                  */
7921                                 skip_fill_up = 1;
7922                                 break;
7923                         }
7924                 }
7925
7926         }
7927         if ((no_data_chunks == 0) &&
7928             (skip_fill_up == 0) &&
7929             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7930                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7931                         /*
7932                          * This for loop we are in takes in each net, if
7933                          * its's got space in cwnd and has data sent to it
7934                          * (when CMT is off) then it calls
7935                          * sctp_fill_outqueue for the net. This gets data on
7936                          * the send queue for that network.
7937                          *
7938                          * In sctp_fill_outqueue TSN's are assigned and data
7939                          * is copied out of the stream buffers. Note mostly
7940                          * copy by reference (we hope).
7941                          */
7942                         net->window_probe = 0;
7943                         if ((net != stcb->asoc.alternate) &&
7944                             ((net->dest_state & SCTP_ADDR_PF) ||
7945                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7946                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7947                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7948                                         sctp_log_cwnd(stcb, net, 1,
7949                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7950                                 }
7951                                 continue;
7952                         }
7953                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7954                             (net->flight_size == 0)) {
7955                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7956                         }
7957                         if (net->flight_size >= net->cwnd) {
7958                                 /* skip this network, no room - can't fill */
7959                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7960                                         sctp_log_cwnd(stcb, net, 3,
7961                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7962                                 }
7963                                 continue;
7964                         }
7965                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7966                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7967                         }
7968                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7969                         if (quit_now) {
7970                                 /* memory alloc failure */
7971                                 no_data_chunks = 1;
7972                                 break;
7973                         }
7974                 }
7975         }
7976         /* now service each destination and send out what we can for it */
7977         /* Nothing to send? */
7978         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7979             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7980             TAILQ_EMPTY(&asoc->send_queue)) {
7981                 *reason_code = 8;
7982                 return (0);
7983         }
7984         if (asoc->sctp_cmt_on_off > 0) {
7985                 /* get the last start point */
7986                 start_at = asoc->last_net_cmt_send_started;
7987                 if (start_at == NULL) {
7988                         /* null so to beginning */
7989                         start_at = TAILQ_FIRST(&asoc->nets);
7990                 } else {
7991                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7992                         if (start_at == NULL) {
7993                                 start_at = TAILQ_FIRST(&asoc->nets);
7994                         }
7995                 }
7996                 asoc->last_net_cmt_send_started = start_at;
7997         } else {
7998                 start_at = TAILQ_FIRST(&asoc->nets);
7999         }
8000         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8001                 if (chk->whoTo == NULL) {
8002                         if (asoc->alternate) {
8003                                 chk->whoTo = asoc->alternate;
8004                         } else {
8005                                 chk->whoTo = asoc->primary_destination;
8006                         }
8007                         atomic_add_int(&chk->whoTo->ref_count, 1);
8008                 }
8009         }
8010         old_start_at = NULL;
8011 again_one_more_time:
8012         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8013                 /* how much can we send? */
8014                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8015                 if (old_start_at && (old_start_at == net)) {
8016                         /* through list ocmpletely. */
8017                         break;
8018                 }
8019                 tsns_sent = 0xa;
8020                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8021                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8022                     (net->flight_size >= net->cwnd)) {
8023                         /*
8024                          * Nothing on control or asconf and flight is full,
8025                          * we can skip even in the CMT case.
8026                          */
8027                         continue;
8028                 }
8029                 bundle_at = 0;
8030                 endoutchain = outchain = NULL;
8031                 no_fragmentflg = 1;
8032                 one_chunk = 0;
8033                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8034                         skip_data_for_this_net = 1;
8035                 } else {
8036                         skip_data_for_this_net = 0;
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                                         asoc->ifp_had_enobuf = 1;
8833                                         SCTP_STAT_INCR(sctps_lowlevelerr);
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;
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         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8963         chk->rec.chunk_id.can_take_data = 0;
8964         hdr = mtod(op_err, struct sctp_chunkhdr *);
8965         hdr->chunk_type = SCTP_OPERATION_ERROR;
8966         hdr->chunk_flags = 0;
8967         hdr->chunk_length = htons(chk->send_size);
8968         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8969         chk->asoc->ctrl_queue_cnt++;
8970 }
8971
8972 int
8973 sctp_send_cookie_echo(struct mbuf *m,
8974     int offset,
8975     struct sctp_tcb *stcb,
8976     struct sctp_nets *net)
8977 {
8978         /*-
8979          * pull out the cookie and put it at the front of the control chunk
8980          * queue.
8981          */
8982         int at;
8983         struct mbuf *cookie;
8984         struct sctp_paramhdr param, *phdr;
8985         struct sctp_chunkhdr *hdr;
8986         struct sctp_tmit_chunk *chk;
8987         uint16_t ptype, plen;
8988
8989         SCTP_TCB_LOCK_ASSERT(stcb);
8990         /* First find the cookie in the param area */
8991         cookie = NULL;
8992         at = offset + sizeof(struct sctp_init_chunk);
8993         for (;;) {
8994                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8995                 if (phdr == NULL) {
8996                         return (-3);
8997                 }
8998                 ptype = ntohs(phdr->param_type);
8999                 plen = ntohs(phdr->param_length);
9000                 if (ptype == SCTP_STATE_COOKIE) {
9001                         int pad;
9002
9003                         /* found the cookie */
9004                         if ((pad = (plen % 4))) {
9005                                 plen += 4 - pad;
9006                         }
9007                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9008                         if (cookie == NULL) {
9009                                 /* No memory */
9010                                 return (-2);
9011                         }
9012 #ifdef SCTP_MBUF_LOGGING
9013                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9014                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9015                         }
9016 #endif
9017                         break;
9018                 }
9019                 at += SCTP_SIZE32(plen);
9020         }
9021         /* ok, we got the cookie lets change it into a cookie echo chunk */
9022         /* first the change from param to cookie */
9023         hdr = mtod(cookie, struct sctp_chunkhdr *);
9024         hdr->chunk_type = SCTP_COOKIE_ECHO;
9025         hdr->chunk_flags = 0;
9026         /* get the chunk stuff now and place it in the FRONT of the queue */
9027         sctp_alloc_a_chunk(stcb, chk);
9028         if (chk == NULL) {
9029                 /* no memory */
9030                 sctp_m_freem(cookie);
9031                 return (-5);
9032         }
9033         chk->copy_by_ref = 0;
9034         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9035         chk->rec.chunk_id.can_take_data = 0;
9036         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9037         chk->send_size = plen;
9038         chk->sent = SCTP_DATAGRAM_UNSENT;
9039         chk->snd_count = 0;
9040         chk->asoc = &stcb->asoc;
9041         chk->data = cookie;
9042         chk->whoTo = net;
9043         atomic_add_int(&chk->whoTo->ref_count, 1);
9044         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9045         chk->asoc->ctrl_queue_cnt++;
9046         return (0);
9047 }
9048
9049 void
9050 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9051     struct mbuf *m,
9052     int offset,
9053     int chk_length,
9054     struct sctp_nets *net)
9055 {
9056         /*
9057          * take a HB request and make it into a HB ack and send it.
9058          */
9059         struct mbuf *outchain;
9060         struct sctp_chunkhdr *chdr;
9061         struct sctp_tmit_chunk *chk;
9062
9063
9064         if (net == NULL)
9065                 /* must have a net pointer */
9066                 return;
9067
9068         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9069         if (outchain == NULL) {
9070                 /* gak out of memory */
9071                 return;
9072         }
9073 #ifdef SCTP_MBUF_LOGGING
9074         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9075                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9076         }
9077 #endif
9078         chdr = mtod(outchain, struct sctp_chunkhdr *);
9079         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9080         chdr->chunk_flags = 0;
9081         if (chk_length % 4) {
9082                 /* need pad */
9083                 uint32_t cpthis = 0;
9084                 int padlen;
9085
9086                 padlen = 4 - (chk_length % 4);
9087                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9088         }
9089         sctp_alloc_a_chunk(stcb, chk);
9090         if (chk == NULL) {
9091                 /* no memory */
9092                 sctp_m_freem(outchain);
9093                 return;
9094         }
9095         chk->copy_by_ref = 0;
9096         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9097         chk->rec.chunk_id.can_take_data = 1;
9098         chk->flags = 0;
9099         chk->send_size = chk_length;
9100         chk->sent = SCTP_DATAGRAM_UNSENT;
9101         chk->snd_count = 0;
9102         chk->asoc = &stcb->asoc;
9103         chk->data = outchain;
9104         chk->whoTo = net;
9105         atomic_add_int(&chk->whoTo->ref_count, 1);
9106         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9107         chk->asoc->ctrl_queue_cnt++;
9108 }
9109
9110 void
9111 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9112 {
9113         /* formulate and queue a cookie-ack back to sender */
9114         struct mbuf *cookie_ack;
9115         struct sctp_chunkhdr *hdr;
9116         struct sctp_tmit_chunk *chk;
9117
9118         SCTP_TCB_LOCK_ASSERT(stcb);
9119
9120         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9121         if (cookie_ack == NULL) {
9122                 /* no mbuf's */
9123                 return;
9124         }
9125         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9126         sctp_alloc_a_chunk(stcb, chk);
9127         if (chk == NULL) {
9128                 /* no memory */
9129                 sctp_m_freem(cookie_ack);
9130                 return;
9131         }
9132         chk->copy_by_ref = 0;
9133         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9134         chk->rec.chunk_id.can_take_data = 1;
9135         chk->flags = 0;
9136         chk->send_size = sizeof(struct sctp_chunkhdr);
9137         chk->sent = SCTP_DATAGRAM_UNSENT;
9138         chk->snd_count = 0;
9139         chk->asoc = &stcb->asoc;
9140         chk->data = cookie_ack;
9141         if (chk->asoc->last_control_chunk_from != NULL) {
9142                 chk->whoTo = chk->asoc->last_control_chunk_from;
9143                 atomic_add_int(&chk->whoTo->ref_count, 1);
9144         } else {
9145                 chk->whoTo = NULL;
9146         }
9147         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9148         hdr->chunk_type = SCTP_COOKIE_ACK;
9149         hdr->chunk_flags = 0;
9150         hdr->chunk_length = htons(chk->send_size);
9151         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9152         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9153         chk->asoc->ctrl_queue_cnt++;
9154         return;
9155 }
9156
9157
9158 void
9159 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9160 {
9161         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9162         struct mbuf *m_shutdown_ack;
9163         struct sctp_shutdown_ack_chunk *ack_cp;
9164         struct sctp_tmit_chunk *chk;
9165
9166         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9167         if (m_shutdown_ack == NULL) {
9168                 /* no mbuf's */
9169                 return;
9170         }
9171         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9172         sctp_alloc_a_chunk(stcb, chk);
9173         if (chk == NULL) {
9174                 /* no memory */
9175                 sctp_m_freem(m_shutdown_ack);
9176                 return;
9177         }
9178         chk->copy_by_ref = 0;
9179         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9180         chk->rec.chunk_id.can_take_data = 1;
9181         chk->flags = 0;
9182         chk->send_size = sizeof(struct sctp_chunkhdr);
9183         chk->sent = SCTP_DATAGRAM_UNSENT;
9184         chk->snd_count = 0;
9185         chk->flags = 0;
9186         chk->asoc = &stcb->asoc;
9187         chk->data = m_shutdown_ack;
9188         chk->whoTo = net;
9189         if (chk->whoTo) {
9190                 atomic_add_int(&chk->whoTo->ref_count, 1);
9191         }
9192         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9193         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9194         ack_cp->ch.chunk_flags = 0;
9195         ack_cp->ch.chunk_length = htons(chk->send_size);
9196         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9197         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9198         chk->asoc->ctrl_queue_cnt++;
9199         return;
9200 }
9201
9202 void
9203 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9204 {
9205         /* formulate and queue a SHUTDOWN to the sender */
9206         struct mbuf *m_shutdown;
9207         struct sctp_shutdown_chunk *shutdown_cp;
9208         struct sctp_tmit_chunk *chk;
9209
9210         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9211                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9212                         /* We already have a SHUTDOWN queued. Reuse it. */
9213                         if (chk->whoTo) {
9214                                 sctp_free_remote_addr(chk->whoTo);
9215                                 chk->whoTo = NULL;
9216                         }
9217                         break;
9218                 }
9219         }
9220         if (chk == NULL) {
9221                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9222                 if (m_shutdown == NULL) {
9223                         /* no mbuf's */
9224                         return;
9225                 }
9226                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9227                 sctp_alloc_a_chunk(stcb, chk);
9228                 if (chk == NULL) {
9229                         /* no memory */
9230                         sctp_m_freem(m_shutdown);
9231                         return;
9232                 }
9233                 chk->copy_by_ref = 0;
9234                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9235                 chk->rec.chunk_id.can_take_data = 1;
9236                 chk->flags = 0;
9237                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9238                 chk->sent = SCTP_DATAGRAM_UNSENT;
9239                 chk->snd_count = 0;
9240                 chk->flags = 0;
9241                 chk->asoc = &stcb->asoc;
9242                 chk->data = m_shutdown;
9243                 chk->whoTo = net;
9244                 if (chk->whoTo) {
9245                         atomic_add_int(&chk->whoTo->ref_count, 1);
9246                 }
9247                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9248                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9249                 shutdown_cp->ch.chunk_flags = 0;
9250                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9251                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9252                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9253                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9254                 chk->asoc->ctrl_queue_cnt++;
9255         } else {
9256                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9257                 chk->whoTo = net;
9258                 if (chk->whoTo) {
9259                         atomic_add_int(&chk->whoTo->ref_count, 1);
9260                 }
9261                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9262                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9263                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9264         }
9265         return;
9266 }
9267
9268 void
9269 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9270 {
9271         /*
9272          * formulate and queue an ASCONF to the peer. ASCONF parameters
9273          * should be queued on the assoc queue.
9274          */
9275         struct sctp_tmit_chunk *chk;
9276         struct mbuf *m_asconf;
9277         int len;
9278
9279         SCTP_TCB_LOCK_ASSERT(stcb);
9280
9281         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9282             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9283                 /* can't send a new one if there is one in flight already */
9284                 return;
9285         }
9286         /* compose an ASCONF chunk, maximum length is PMTU */
9287         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9288         if (m_asconf == NULL) {
9289                 return;
9290         }
9291         sctp_alloc_a_chunk(stcb, chk);
9292         if (chk == NULL) {
9293                 /* no memory */
9294                 sctp_m_freem(m_asconf);
9295                 return;
9296         }
9297         chk->copy_by_ref = 0;
9298         chk->rec.chunk_id.id = SCTP_ASCONF;
9299         chk->rec.chunk_id.can_take_data = 0;
9300         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9301         chk->data = m_asconf;
9302         chk->send_size = len;
9303         chk->sent = SCTP_DATAGRAM_UNSENT;
9304         chk->snd_count = 0;
9305         chk->asoc = &stcb->asoc;
9306         chk->whoTo = net;
9307         if (chk->whoTo) {
9308                 atomic_add_int(&chk->whoTo->ref_count, 1);
9309         }
9310         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9311         chk->asoc->ctrl_queue_cnt++;
9312         return;
9313 }
9314
9315 void
9316 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9317 {
9318         /*
9319          * formulate and queue a asconf-ack back to sender. the asconf-ack
9320          * must be stored in the tcb.
9321          */
9322         struct sctp_tmit_chunk *chk;
9323         struct sctp_asconf_ack *ack, *latest_ack;
9324         struct mbuf *m_ack;
9325         struct sctp_nets *net = NULL;
9326
9327         SCTP_TCB_LOCK_ASSERT(stcb);
9328         /* Get the latest ASCONF-ACK */
9329         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9330         if (latest_ack == NULL) {
9331                 return;
9332         }
9333         if (latest_ack->last_sent_to != NULL &&
9334             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9335                 /* we're doing a retransmission */
9336                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9337                 if (net == NULL) {
9338                         /* no alternate */
9339                         if (stcb->asoc.last_control_chunk_from == NULL) {
9340                                 if (stcb->asoc.alternate) {
9341                                         net = stcb->asoc.alternate;
9342                                 } else {
9343                                         net = stcb->asoc.primary_destination;
9344                                 }
9345                         } else {
9346                                 net = stcb->asoc.last_control_chunk_from;
9347                         }
9348                 }
9349         } else {
9350                 /* normal case */
9351                 if (stcb->asoc.last_control_chunk_from == NULL) {
9352                         if (stcb->asoc.alternate) {
9353                                 net = stcb->asoc.alternate;
9354                         } else {
9355                                 net = stcb->asoc.primary_destination;
9356                         }
9357                 } else {
9358                         net = stcb->asoc.last_control_chunk_from;
9359                 }
9360         }
9361         latest_ack->last_sent_to = net;
9362
9363         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9364                 if (ack->data == NULL) {
9365                         continue;
9366                 }
9367                 /* copy the asconf_ack */
9368                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9369                 if (m_ack == NULL) {
9370                         /* couldn't copy it */
9371                         return;
9372                 }
9373 #ifdef SCTP_MBUF_LOGGING
9374                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9375                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9376                 }
9377 #endif
9378
9379                 sctp_alloc_a_chunk(stcb, chk);
9380                 if (chk == NULL) {
9381                         /* no memory */
9382                         if (m_ack)
9383                                 sctp_m_freem(m_ack);
9384                         return;
9385                 }
9386                 chk->copy_by_ref = 0;
9387                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9388                 chk->rec.chunk_id.can_take_data = 1;
9389                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9390                 chk->whoTo = net;
9391                 if (chk->whoTo) {
9392                         atomic_add_int(&chk->whoTo->ref_count, 1);
9393                 }
9394                 chk->data = m_ack;
9395                 chk->send_size = ack->len;
9396                 chk->sent = SCTP_DATAGRAM_UNSENT;
9397                 chk->snd_count = 0;
9398                 chk->asoc = &stcb->asoc;
9399
9400                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9401                 chk->asoc->ctrl_queue_cnt++;
9402         }
9403         return;
9404 }
9405
9406
9407 static int
9408 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9409     struct sctp_tcb *stcb,
9410     struct sctp_association *asoc,
9411     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9412 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9413     SCTP_UNUSED
9414 #endif
9415 )
9416 {
9417         /*-
9418          * send out one MTU of retransmission. If fast_retransmit is
9419          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9420          * rwnd. For a Cookie or Asconf in the control chunk queue we
9421          * retransmit them by themselves.
9422          *
9423          * For data chunks we will pick out the lowest TSN's in the sent_queue
9424          * marked for resend and bundle them all together (up to a MTU of
9425          * destination). The address to send to should have been
9426          * selected/changed where the retransmission was marked (i.e. in FR
9427          * or t3-timeout routines).
9428          */
9429         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9430         struct sctp_tmit_chunk *chk, *fwd;
9431         struct mbuf *m, *endofchain;
9432         struct sctp_nets *net = NULL;
9433         uint32_t tsns_sent = 0;
9434         int no_fragmentflg, bundle_at, cnt_thru;
9435         unsigned int mtu;
9436         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9437         struct sctp_auth_chunk *auth = NULL;
9438         uint32_t auth_offset = 0;
9439         uint16_t auth_keyid;
9440         int override_ok = 1;
9441         int data_auth_reqd = 0;
9442         uint32_t dmtu = 0;
9443
9444         SCTP_TCB_LOCK_ASSERT(stcb);
9445         tmr_started = ctl_cnt = bundle_at = error = 0;
9446         no_fragmentflg = 1;
9447         fwd_tsn = 0;
9448         *cnt_out = 0;
9449         fwd = NULL;
9450         endofchain = m = NULL;
9451         auth_keyid = stcb->asoc.authinfo.active_keyid;
9452 #ifdef SCTP_AUDITING_ENABLED
9453         sctp_audit_log(0xC3, 1);
9454 #endif
9455         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9456             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9457                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9458                     asoc->sent_queue_retran_cnt);
9459                 asoc->sent_queue_cnt = 0;
9460                 asoc->sent_queue_cnt_removeable = 0;
9461                 /* send back 0/0 so we enter normal transmission */
9462                 *cnt_out = 0;
9463                 return (0);
9464         }
9465         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9466                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9467                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9468                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9469                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9470                                 continue;
9471                         }
9472                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9473                                 if (chk != asoc->str_reset) {
9474                                         /*
9475                                          * not eligible for retran if its
9476                                          * not ours
9477                                          */
9478                                         continue;
9479                                 }
9480                         }
9481                         ctl_cnt++;
9482                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9483                                 fwd_tsn = 1;
9484                         }
9485                         /*
9486                          * Add an AUTH chunk, if chunk requires it save the
9487                          * offset into the chain for AUTH
9488                          */
9489                         if ((auth == NULL) &&
9490                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9491                             stcb->asoc.peer_auth_chunks))) {
9492                                 m = sctp_add_auth_chunk(m, &endofchain,
9493                                     &auth, &auth_offset,
9494                                     stcb,
9495                                     chk->rec.chunk_id.id);
9496                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9497                         }
9498                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9499                         break;
9500                 }
9501         }
9502         one_chunk = 0;
9503         cnt_thru = 0;
9504         /* do we have control chunks to retransmit? */
9505         if (m != NULL) {
9506                 /* Start a timer no matter if we succeed or fail */
9507                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9508                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9509                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9510                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9511                 chk->snd_count++;       /* update our count */
9512                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9513                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9514                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9515                     no_fragmentflg, 0, 0,
9516                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9517                     chk->whoTo->port, NULL,
9518                     0, 0,
9519                     so_locked))) {
9520                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9521                         if (error == ENOBUFS) {
9522                                 asoc->ifp_had_enobuf = 1;
9523                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9524                         }
9525                         return (error);
9526                 } else {
9527                         asoc->ifp_had_enobuf = 0;
9528                 }
9529                 endofchain = NULL;
9530                 auth = NULL;
9531                 auth_offset = 0;
9532                 /*
9533                  * We don't want to mark the net->sent time here since this
9534                  * we use this for HB and retrans cannot measure RTT
9535                  */
9536                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9537                 *cnt_out += 1;
9538                 chk->sent = SCTP_DATAGRAM_SENT;
9539                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9540                 if (fwd_tsn == 0) {
9541                         return (0);
9542                 } else {
9543                         /* Clean up the fwd-tsn list */
9544                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9545                         return (0);
9546                 }
9547         }
9548         /*
9549          * Ok, it is just data retransmission we need to do or that and a
9550          * fwd-tsn with it all.
9551          */
9552         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9553                 return (SCTP_RETRAN_DONE);
9554         }
9555         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9556             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9557                 /* not yet open, resend the cookie and that is it */
9558                 return (1);
9559         }
9560 #ifdef SCTP_AUDITING_ENABLED
9561         sctp_auditing(20, inp, stcb, NULL);
9562 #endif
9563         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9564         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9565                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9566                         /* No, not sent to this net or not ready for rtx */
9567                         continue;
9568                 }
9569                 if (chk->data == NULL) {
9570                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9571                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9572                         continue;
9573                 }
9574                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9575                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9576                         struct mbuf *op_err;
9577                         char msg[SCTP_DIAG_INFO_LEN];
9578
9579                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9580                             chk->rec.data.tsn, chk->snd_count);
9581                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9582                             msg);
9583                         atomic_add_int(&stcb->asoc.refcnt, 1);
9584                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9585                             so_locked);
9586                         SCTP_TCB_LOCK(stcb);
9587                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9588                         return (SCTP_RETRAN_EXIT);
9589                 }
9590                 /* pick up the net */
9591                 net = chk->whoTo;
9592                 switch (net->ro._l_addr.sa.sa_family) {
9593 #ifdef INET
9594                 case AF_INET:
9595                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9596                         break;
9597 #endif
9598 #ifdef INET6
9599                 case AF_INET6:
9600                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9601                         break;
9602 #endif
9603                 default:
9604                         /* TSNH */
9605                         mtu = net->mtu;
9606                         break;
9607                 }
9608
9609                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9610                         /* No room in peers rwnd */
9611                         uint32_t tsn;
9612
9613                         tsn = asoc->last_acked_seq + 1;
9614                         if (tsn == chk->rec.data.tsn) {
9615                                 /*
9616                                  * we make a special exception for this
9617                                  * case. The peer has no rwnd but is missing
9618                                  * the lowest chunk.. which is probably what
9619                                  * is holding up the rwnd.
9620                                  */
9621                                 goto one_chunk_around;
9622                         }
9623                         return (1);
9624                 }
9625 one_chunk_around:
9626                 if (asoc->peers_rwnd < mtu) {
9627                         one_chunk = 1;
9628                         if ((asoc->peers_rwnd == 0) &&
9629                             (asoc->total_flight == 0)) {
9630                                 chk->window_probe = 1;
9631                                 chk->whoTo->window_probe = 1;
9632                         }
9633                 }
9634 #ifdef SCTP_AUDITING_ENABLED
9635                 sctp_audit_log(0xC3, 2);
9636 #endif
9637                 bundle_at = 0;
9638                 m = NULL;
9639                 net->fast_retran_ip = 0;
9640                 if (chk->rec.data.doing_fast_retransmit == 0) {
9641                         /*
9642                          * if no FR in progress skip destination that have
9643                          * flight_size > cwnd.
9644                          */
9645                         if (net->flight_size >= net->cwnd) {
9646                                 continue;
9647                         }
9648                 } else {
9649                         /*
9650                          * Mark the destination net to have FR recovery
9651                          * limits put on it.
9652                          */
9653                         *fr_done = 1;
9654                         net->fast_retran_ip = 1;
9655                 }
9656
9657                 /*
9658                  * if no AUTH is yet included and this chunk requires it,
9659                  * make sure to account for it.  We don't apply the size
9660                  * until the AUTH chunk is actually added below in case
9661                  * there is no room for this chunk.
9662                  */
9663                 if (data_auth_reqd && (auth == NULL)) {
9664                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9665                 } else
9666                         dmtu = 0;
9667
9668                 if ((chk->send_size <= (mtu - dmtu)) ||
9669                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9670                         /* ok we will add this one */
9671                         if (data_auth_reqd) {
9672                                 if (auth == NULL) {
9673                                         m = sctp_add_auth_chunk(m,
9674                                             &endofchain,
9675                                             &auth,
9676                                             &auth_offset,
9677                                             stcb,
9678                                             SCTP_DATA);
9679                                         auth_keyid = chk->auth_keyid;
9680                                         override_ok = 0;
9681                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9682                                 } else if (override_ok) {
9683                                         auth_keyid = chk->auth_keyid;
9684                                         override_ok = 0;
9685                                 } else if (chk->auth_keyid != auth_keyid) {
9686                                         /* different keyid, so done bundling */
9687                                         break;
9688                                 }
9689                         }
9690                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9691                         if (m == NULL) {
9692                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9693                                 return (ENOMEM);
9694                         }
9695                         /* Do clear IP_DF ? */
9696                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9697                                 no_fragmentflg = 0;
9698                         }
9699                         /* upate our MTU size */
9700                         if (mtu > (chk->send_size + dmtu))
9701                                 mtu -= (chk->send_size + dmtu);
9702                         else
9703                                 mtu = 0;
9704                         data_list[bundle_at++] = chk;
9705                         if (one_chunk && (asoc->total_flight <= 0)) {
9706                                 SCTP_STAT_INCR(sctps_windowprobed);
9707                         }
9708                 }
9709                 if (one_chunk == 0) {
9710                         /*
9711                          * now are there anymore forward from chk to pick
9712                          * up?
9713                          */
9714                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9715                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9716                                         /* Nope, not for retran */
9717                                         continue;
9718                                 }
9719                                 if (fwd->whoTo != net) {
9720                                         /* Nope, not the net in question */
9721                                         continue;
9722                                 }
9723                                 if (data_auth_reqd && (auth == NULL)) {
9724                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9725                                 } else
9726                                         dmtu = 0;
9727                                 if (fwd->send_size <= (mtu - dmtu)) {
9728                                         if (data_auth_reqd) {
9729                                                 if (auth == NULL) {
9730                                                         m = sctp_add_auth_chunk(m,
9731                                                             &endofchain,
9732                                                             &auth,
9733                                                             &auth_offset,
9734                                                             stcb,
9735                                                             SCTP_DATA);
9736                                                         auth_keyid = fwd->auth_keyid;
9737                                                         override_ok = 0;
9738                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9739                                                 } else if (override_ok) {
9740                                                         auth_keyid = fwd->auth_keyid;
9741                                                         override_ok = 0;
9742                                                 } else if (fwd->auth_keyid != auth_keyid) {
9743                                                         /*
9744                                                          * different keyid,
9745                                                          * so done bundling
9746                                                          */
9747                                                         break;
9748                                                 }
9749                                         }
9750                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9751                                         if (m == NULL) {
9752                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9753                                                 return (ENOMEM);
9754                                         }
9755                                         /* Do clear IP_DF ? */
9756                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9757                                                 no_fragmentflg = 0;
9758                                         }
9759                                         /* upate our MTU size */
9760                                         if (mtu > (fwd->send_size + dmtu))
9761                                                 mtu -= (fwd->send_size + dmtu);
9762                                         else
9763                                                 mtu = 0;
9764                                         data_list[bundle_at++] = fwd;
9765                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9766                                                 break;
9767                                         }
9768                                 } else {
9769                                         /* can't fit so we are done */
9770                                         break;
9771                                 }
9772                         }
9773                 }
9774                 /* Is there something to send for this destination? */
9775                 if (m) {
9776                         /*
9777                          * No matter if we fail/or succeed we should start a
9778                          * timer. A failure is like a lost IP packet :-)
9779                          */
9780                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9781                                 /*
9782                                  * no timer running on this destination
9783                                  * restart it.
9784                                  */
9785                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9786                                 tmr_started = 1;
9787                         }
9788                         /* Now lets send it, if there is anything to send :> */
9789                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9790                             (struct sockaddr *)&net->ro._l_addr, m,
9791                             auth_offset, auth, auth_keyid,
9792                             no_fragmentflg, 0, 0,
9793                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9794                             net->port, NULL,
9795                             0, 0,
9796                             so_locked))) {
9797                                 /* error, we could not output */
9798                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9799                                 if (error == ENOBUFS) {
9800                                         asoc->ifp_had_enobuf = 1;
9801                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9802                                 }
9803                                 return (error);
9804                         } else {
9805                                 asoc->ifp_had_enobuf = 0;
9806                         }
9807                         endofchain = NULL;
9808                         auth = NULL;
9809                         auth_offset = 0;
9810                         /* For HB's */
9811                         /*
9812                          * We don't want to mark the net->sent time here
9813                          * since this we use this for HB and retrans cannot
9814                          * measure RTT
9815                          */
9816                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9817
9818                         /* For auto-close */
9819                         cnt_thru++;
9820                         if (*now_filled == 0) {
9821                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9822                                 *now = asoc->time_last_sent;
9823                                 *now_filled = 1;
9824                         } else {
9825                                 asoc->time_last_sent = *now;
9826                         }
9827                         *cnt_out += bundle_at;
9828 #ifdef SCTP_AUDITING_ENABLED
9829                         sctp_audit_log(0xC4, bundle_at);
9830 #endif
9831                         if (bundle_at) {
9832                                 tsns_sent = data_list[0]->rec.data.tsn;
9833                         }
9834                         for (i = 0; i < bundle_at; i++) {
9835                                 SCTP_STAT_INCR(sctps_sendretransdata);
9836                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9837                                 /*
9838                                  * When we have a revoked data, and we
9839                                  * retransmit it, then we clear the revoked
9840                                  * flag since this flag dictates if we
9841                                  * subtracted from the fs
9842                                  */
9843                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9844                                         /* Deflate the cwnd */
9845                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9846                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9847                                 }
9848                                 data_list[i]->snd_count++;
9849                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9850                                 /* record the time */
9851                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9852                                 if (data_list[i]->book_size_scale) {
9853                                         /*
9854                                          * need to double the book size on
9855                                          * this one
9856                                          */
9857                                         data_list[i]->book_size_scale = 0;
9858                                         /*
9859                                          * Since we double the booksize, we
9860                                          * must also double the output queue
9861                                          * size, since this get shrunk when
9862                                          * we free by this amount.
9863                                          */
9864                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9865                                         data_list[i]->book_size *= 2;
9866
9867
9868                                 } else {
9869                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9870                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9871                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9872                                         }
9873                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9874                                             (uint32_t)(data_list[i]->send_size +
9875                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9876                                 }
9877                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9878                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9879                                             data_list[i]->whoTo->flight_size,
9880                                             data_list[i]->book_size,
9881                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9882                                             data_list[i]->rec.data.tsn);
9883                                 }
9884                                 sctp_flight_size_increase(data_list[i]);
9885                                 sctp_total_flight_increase(stcb, data_list[i]);
9886                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9887                                         /* SWS sender side engages */
9888                                         asoc->peers_rwnd = 0;
9889                                 }
9890                                 if ((i == 0) &&
9891                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9892                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9893                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9894                                             (tmr_started == 0)) {
9895                                                 /*-
9896                                                  * ok we just fast-retrans'd
9897                                                  * the lowest TSN, i.e the
9898                                                  * first on the list. In
9899                                                  * this case we want to give
9900                                                  * some more time to get a
9901                                                  * SACK back without a
9902                                                  * t3-expiring.
9903                                                  */
9904                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9905                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9906                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9907                                         }
9908                                 }
9909                         }
9910                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9911                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9912                         }
9913 #ifdef SCTP_AUDITING_ENABLED
9914                         sctp_auditing(21, inp, stcb, NULL);
9915 #endif
9916                 } else {
9917                         /* None will fit */
9918                         return (1);
9919                 }
9920                 if (asoc->sent_queue_retran_cnt <= 0) {
9921                         /* all done we have no more to retran */
9922                         asoc->sent_queue_retran_cnt = 0;
9923                         break;
9924                 }
9925                 if (one_chunk) {
9926                         /* No more room in rwnd */
9927                         return (1);
9928                 }
9929                 /* stop the for loop here. we sent out a packet */
9930                 break;
9931         }
9932         return (0);
9933 }
9934
9935 static void
9936 sctp_timer_validation(struct sctp_inpcb *inp,
9937     struct sctp_tcb *stcb,
9938     struct sctp_association *asoc)
9939 {
9940         struct sctp_nets *net;
9941
9942         /* Validate that a timer is running somewhere */
9943         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9944                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9945                         /* Here is a timer */
9946                         return;
9947                 }
9948         }
9949         SCTP_TCB_LOCK_ASSERT(stcb);
9950         /* Gak, we did not have a timer somewhere */
9951         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9952         if (asoc->alternate) {
9953                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9954         } else {
9955                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9956         }
9957         return;
9958 }
9959
9960 void
9961 sctp_chunk_output(struct sctp_inpcb *inp,
9962     struct sctp_tcb *stcb,
9963     int from_where,
9964     int so_locked
9965 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9966     SCTP_UNUSED
9967 #endif
9968 )
9969 {
9970         /*-
9971          * Ok this is the generic chunk service queue. we must do the
9972          * following:
9973          * - See if there are retransmits pending, if so we must
9974          *   do these first.
9975          * - Service the stream queue that is next, moving any
9976          *   message (note I must get a complete message i.e.
9977          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9978          *   TSN's
9979          * - Check to see if the cwnd/rwnd allows any output, if so we
9980          *   go ahead and fomulate and send the low level chunks. Making sure
9981          *   to combine any control in the control chunk queue also.
9982          */
9983         struct sctp_association *asoc;
9984         struct sctp_nets *net;
9985         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9986         unsigned int burst_cnt = 0;
9987         struct timeval now;
9988         int now_filled = 0;
9989         int nagle_on;
9990         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9991         int un_sent = 0;
9992         int fr_done;
9993         unsigned int tot_frs = 0;
9994
9995         asoc = &stcb->asoc;
9996 do_it_again:
9997         /* The Nagle algorithm is only applied when handling a send call. */
9998         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9999                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10000                         nagle_on = 0;
10001                 } else {
10002                         nagle_on = 1;
10003                 }
10004         } else {
10005                 nagle_on = 0;
10006         }
10007         SCTP_TCB_LOCK_ASSERT(stcb);
10008
10009         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10010
10011         if ((un_sent <= 0) &&
10012             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10013             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10014             (asoc->sent_queue_retran_cnt == 0) &&
10015             (asoc->trigger_reset == 0)) {
10016                 /* Nothing to do unless there is something to be sent left */
10017                 return;
10018         }
10019         /*
10020          * Do we have something to send, data or control AND a sack timer
10021          * running, if so piggy-back the sack.
10022          */
10023         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10024                 sctp_send_sack(stcb, so_locked);
10025                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10026         }
10027         while (asoc->sent_queue_retran_cnt) {
10028                 /*-
10029                  * Ok, it is retransmission time only, we send out only ONE
10030                  * packet with a single call off to the retran code.
10031                  */
10032                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10033                         /*-
10034                          * Special hook for handling cookiess discarded
10035                          * by peer that carried data. Send cookie-ack only
10036                          * and then the next call with get the retran's.
10037                          */
10038                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10039                             from_where,
10040                             &now, &now_filled, frag_point, so_locked);
10041                         return;
10042                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10043                         /* if its not from a HB then do it */
10044                         fr_done = 0;
10045                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10046                         if (fr_done) {
10047                                 tot_frs++;
10048                         }
10049                 } else {
10050                         /*
10051                          * its from any other place, we don't allow retran
10052                          * output (only control)
10053                          */
10054                         ret = 1;
10055                 }
10056                 if (ret > 0) {
10057                         /* Can't send anymore */
10058                         /*-
10059                          * now lets push out control by calling med-level
10060                          * output once. this assures that we WILL send HB's
10061                          * if queued too.
10062                          */
10063                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10064                             from_where,
10065                             &now, &now_filled, frag_point, so_locked);
10066 #ifdef SCTP_AUDITING_ENABLED
10067                         sctp_auditing(8, inp, stcb, NULL);
10068 #endif
10069                         sctp_timer_validation(inp, stcb, asoc);
10070                         return;
10071                 }
10072                 if (ret < 0) {
10073                         /*-
10074                          * The count was off.. retran is not happening so do
10075                          * the normal retransmission.
10076                          */
10077 #ifdef SCTP_AUDITING_ENABLED
10078                         sctp_auditing(9, inp, stcb, NULL);
10079 #endif
10080                         if (ret == SCTP_RETRAN_EXIT) {
10081                                 return;
10082                         }
10083                         break;
10084                 }
10085                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10086                         /* Only one transmission allowed out of a timeout */
10087 #ifdef SCTP_AUDITING_ENABLED
10088                         sctp_auditing(10, inp, stcb, NULL);
10089 #endif
10090                         /* Push out any control */
10091                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10092                             &now, &now_filled, frag_point, so_locked);
10093                         return;
10094                 }
10095                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10096                         /* Hit FR burst limit */
10097                         return;
10098                 }
10099                 if ((num_out == 0) && (ret == 0)) {
10100                         /* No more retrans to send */
10101                         break;
10102                 }
10103         }
10104 #ifdef SCTP_AUDITING_ENABLED
10105         sctp_auditing(12, inp, stcb, NULL);
10106 #endif
10107         /* Check for bad destinations, if they exist move chunks around. */
10108         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10109                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10110                         /*-
10111                          * if possible move things off of this address we
10112                          * still may send below due to the dormant state but
10113                          * we try to find an alternate address to send to
10114                          * and if we have one we move all queued data on the
10115                          * out wheel to this alternate address.
10116                          */
10117                         if (net->ref_count > 1)
10118                                 sctp_move_chunks_from_net(stcb, net);
10119                 } else {
10120                         /*-
10121                          * if ((asoc->sat_network) || (net->addr_is_local))
10122                          * { burst_limit = asoc->max_burst *
10123                          * SCTP_SAT_NETWORK_BURST_INCR; }
10124                          */
10125                         if (asoc->max_burst > 0) {
10126                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10127                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10128                                                 /*
10129                                                  * JRS - Use the congestion
10130                                                  * control given in the
10131                                                  * congestion control module
10132                                                  */
10133                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10134                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10135                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10136                                                 }
10137                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10138                                         }
10139                                         net->fast_retran_ip = 0;
10140                                 } else {
10141                                         if (net->flight_size == 0) {
10142                                                 /*
10143                                                  * Should be decaying the
10144                                                  * cwnd here
10145                                                  */
10146                                                 ;
10147                                         }
10148                                 }
10149                         }
10150                 }
10151
10152         }
10153         burst_cnt = 0;
10154         do {
10155                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10156                     &reason_code, 0, from_where,
10157                     &now, &now_filled, frag_point, so_locked);
10158                 if (error) {
10159                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10160                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10161                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10162                         }
10163                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10164                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10165                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10166                         }
10167                         break;
10168                 }
10169                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10170
10171                 tot_out += num_out;
10172                 burst_cnt++;
10173                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10174                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10175                         if (num_out == 0) {
10176                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10177                         }
10178                 }
10179                 if (nagle_on) {
10180                         /*
10181                          * When the Nagle algorithm is used, look at how
10182                          * much is unsent, then if its smaller than an MTU
10183                          * and we have data in flight we stop, except if we
10184                          * are handling a fragmented user message.
10185                          */
10186                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10187                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10188                             (stcb->asoc.total_flight > 0)) {
10189 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10190                                 break;
10191                         }
10192                 }
10193                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10194                     TAILQ_EMPTY(&asoc->send_queue) &&
10195                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10196                         /* Nothing left to send */
10197                         break;
10198                 }
10199                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10200                         /* Nothing left to send */
10201                         break;
10202                 }
10203         } while (num_out &&
10204             ((asoc->max_burst == 0) ||
10205             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10206             (burst_cnt < asoc->max_burst)));
10207
10208         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10209                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10210                         SCTP_STAT_INCR(sctps_maxburstqueued);
10211                         asoc->burst_limit_applied = 1;
10212                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10213                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10214                         }
10215                 } else {
10216                         asoc->burst_limit_applied = 0;
10217                 }
10218         }
10219         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10220                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10221         }
10222         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10223             tot_out);
10224
10225         /*-
10226          * Now we need to clean up the control chunk chain if a ECNE is on
10227          * it. It must be marked as UNSENT again so next call will continue
10228          * to send it until such time that we get a CWR, to remove it.
10229          */
10230         if (stcb->asoc.ecn_echo_cnt_onq)
10231                 sctp_fix_ecn_echo(asoc);
10232
10233         if (stcb->asoc.trigger_reset) {
10234                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10235                         goto do_it_again;
10236                 }
10237         }
10238         return;
10239 }
10240
10241
10242 int
10243 sctp_output(
10244     struct sctp_inpcb *inp,
10245     struct mbuf *m,
10246     struct sockaddr *addr,
10247     struct mbuf *control,
10248     struct thread *p,
10249     int flags)
10250 {
10251         if (inp == NULL) {
10252                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10253                 return (EINVAL);
10254         }
10255         if (inp->sctp_socket == NULL) {
10256                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10257                 return (EINVAL);
10258         }
10259         return (sctp_sosend(inp->sctp_socket,
10260             addr,
10261             (struct uio *)NULL,
10262             m,
10263             control,
10264             flags, p
10265             ));
10266 }
10267
10268 void
10269 send_forward_tsn(struct sctp_tcb *stcb,
10270     struct sctp_association *asoc)
10271 {
10272         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10273         struct sctp_forward_tsn_chunk *fwdtsn;
10274         struct sctp_strseq *strseq;
10275         struct sctp_strseq_mid *strseq_m;
10276         uint32_t advance_peer_ack_point;
10277         unsigned int cnt_of_space, i, ovh;
10278         unsigned int space_needed;
10279         unsigned int cnt_of_skipped = 0;
10280
10281         SCTP_TCB_LOCK_ASSERT(stcb);
10282         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10283                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10284                         /* mark it to unsent */
10285                         chk->sent = SCTP_DATAGRAM_UNSENT;
10286                         chk->snd_count = 0;
10287                         /* Do we correct its output location? */
10288                         if (chk->whoTo) {
10289                                 sctp_free_remote_addr(chk->whoTo);
10290                                 chk->whoTo = NULL;
10291                         }
10292                         goto sctp_fill_in_rest;
10293                 }
10294         }
10295         /* Ok if we reach here we must build one */
10296         sctp_alloc_a_chunk(stcb, chk);
10297         if (chk == NULL) {
10298                 return;
10299         }
10300         asoc->fwd_tsn_cnt++;
10301         chk->copy_by_ref = 0;
10302         /*
10303          * We don't do the old thing here since this is used not for on-wire
10304          * but to tell if we are sending a fwd-tsn by the stack during
10305          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10306          */
10307         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10308         chk->rec.chunk_id.can_take_data = 0;
10309         chk->flags = 0;
10310         chk->asoc = asoc;
10311         chk->whoTo = NULL;
10312         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10313         if (chk->data == NULL) {
10314                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10315                 return;
10316         }
10317         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10318         chk->sent = SCTP_DATAGRAM_UNSENT;
10319         chk->snd_count = 0;
10320         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10321         asoc->ctrl_queue_cnt++;
10322 sctp_fill_in_rest:
10323         /*-
10324          * Here we go through and fill out the part that deals with
10325          * stream/seq of the ones we skip.
10326          */
10327         SCTP_BUF_LEN(chk->data) = 0;
10328         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10329                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10330                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10331                         /* no more to look at */
10332                         break;
10333                 }
10334                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10335                         /* We don't report these */
10336                         continue;
10337                 }
10338                 cnt_of_skipped++;
10339         }
10340         if (asoc->idata_supported) {
10341                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10342                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10343         } else {
10344                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10345                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10346         }
10347         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10348
10349         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10350                 ovh = SCTP_MIN_OVERHEAD;
10351         } else {
10352                 ovh = SCTP_MIN_V4_OVERHEAD;
10353         }
10354         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10355                 /* trim to a mtu size */
10356                 cnt_of_space = asoc->smallest_mtu - ovh;
10357         }
10358         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10359                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10360                     0xff, 0, cnt_of_skipped,
10361                     asoc->advanced_peer_ack_point);
10362         }
10363         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10364         if (cnt_of_space < space_needed) {
10365                 /*-
10366                  * ok we must trim down the chunk by lowering the
10367                  * advance peer ack point.
10368                  */
10369                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10370                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10371                             0xff, 0xff, cnt_of_space,
10372                             space_needed);
10373                 }
10374                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10375                 if (asoc->idata_supported) {
10376                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10377                 } else {
10378                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10379                 }
10380                 /*-
10381                  * Go through and find the TSN that will be the one
10382                  * we report.
10383                  */
10384                 at = TAILQ_FIRST(&asoc->sent_queue);
10385                 if (at != NULL) {
10386                         for (i = 0; i < cnt_of_skipped; i++) {
10387                                 tp1 = TAILQ_NEXT(at, sctp_next);
10388                                 if (tp1 == NULL) {
10389                                         break;
10390                                 }
10391                                 at = tp1;
10392                         }
10393                 }
10394                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10395                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10396                             0xff, cnt_of_skipped, at->rec.data.tsn,
10397                             asoc->advanced_peer_ack_point);
10398                 }
10399                 last = at;
10400                 /*-
10401                  * last now points to last one I can report, update
10402                  * peer ack point
10403                  */
10404                 if (last) {
10405                         advance_peer_ack_point = last->rec.data.tsn;
10406                 }
10407                 if (asoc->idata_supported) {
10408                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10409                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10410                 } else {
10411                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10412                             cnt_of_skipped * sizeof(struct sctp_strseq);
10413                 }
10414         }
10415         chk->send_size = space_needed;
10416         /* Setup the chunk */
10417         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10418         fwdtsn->ch.chunk_length = htons(chk->send_size);
10419         fwdtsn->ch.chunk_flags = 0;
10420         if (asoc->idata_supported) {
10421                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10422         } else {
10423                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10424         }
10425         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10426         SCTP_BUF_LEN(chk->data) = chk->send_size;
10427         fwdtsn++;
10428         /*-
10429          * Move pointer to after the fwdtsn and transfer to the
10430          * strseq pointer.
10431          */
10432         if (asoc->idata_supported) {
10433                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10434                 strseq = NULL;
10435         } else {
10436                 strseq = (struct sctp_strseq *)fwdtsn;
10437                 strseq_m = NULL;
10438         }
10439         /*-
10440          * Now populate the strseq list. This is done blindly
10441          * without pulling out duplicate stream info. This is
10442          * inefficent but won't harm the process since the peer will
10443          * look at these in sequence and will thus release anything.
10444          * It could mean we exceed the PMTU and chop off some that
10445          * we could have included.. but this is unlikely (aka 1432/4
10446          * would mean 300+ stream seq's would have to be reported in
10447          * one FWD-TSN. With a bit of work we can later FIX this to
10448          * optimize and pull out duplicates.. but it does add more
10449          * overhead. So for now... not!
10450          */
10451         i = 0;
10452         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10453                 if (i >= cnt_of_skipped) {
10454                         break;
10455                 }
10456                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10457                         /* We don't report these */
10458                         continue;
10459                 }
10460                 if (at->rec.data.tsn == advance_peer_ack_point) {
10461                         at->rec.data.fwd_tsn_cnt = 0;
10462                 }
10463                 if (asoc->idata_supported) {
10464                         strseq_m->sid = htons(at->rec.data.sid);
10465                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10466                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10467                         } else {
10468                                 strseq_m->flags = 0;
10469                         }
10470                         strseq_m->mid = htonl(at->rec.data.mid);
10471                         strseq_m++;
10472                 } else {
10473                         strseq->sid = htons(at->rec.data.sid);
10474                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10475                         strseq++;
10476                 }
10477                 i++;
10478         }
10479         return;
10480 }
10481
10482 void
10483 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10484 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10485     SCTP_UNUSED
10486 #endif
10487 )
10488 {
10489         /*-
10490          * Queue up a SACK or NR-SACK in the control queue.
10491          * We must first check to see if a SACK or NR-SACK is
10492          * somehow on the control queue.
10493          * If so, we will take and and remove the old one.
10494          */
10495         struct sctp_association *asoc;
10496         struct sctp_tmit_chunk *chk, *a_chk;
10497         struct sctp_sack_chunk *sack;
10498         struct sctp_nr_sack_chunk *nr_sack;
10499         struct sctp_gap_ack_block *gap_descriptor;
10500         const struct sack_track *selector;
10501         int mergeable = 0;
10502         int offset;
10503         caddr_t limit;
10504         uint32_t *dup;
10505         int limit_reached = 0;
10506         unsigned int i, siz, j;
10507         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10508         int num_dups = 0;
10509         int space_req;
10510         uint32_t highest_tsn;
10511         uint8_t flags;
10512         uint8_t type;
10513         uint8_t tsn_map;
10514
10515         if (stcb->asoc.nrsack_supported == 1) {
10516                 type = SCTP_NR_SELECTIVE_ACK;
10517         } else {
10518                 type = SCTP_SELECTIVE_ACK;
10519         }
10520         a_chk = NULL;
10521         asoc = &stcb->asoc;
10522         SCTP_TCB_LOCK_ASSERT(stcb);
10523         if (asoc->last_data_chunk_from == NULL) {
10524                 /* Hmm we never received anything */
10525                 return;
10526         }
10527         sctp_slide_mapping_arrays(stcb);
10528         sctp_set_rwnd(stcb, asoc);
10529         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10530                 if (chk->rec.chunk_id.id == type) {
10531                         /* Hmm, found a sack already on queue, remove it */
10532                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10533                         asoc->ctrl_queue_cnt--;
10534                         a_chk = chk;
10535                         if (a_chk->data) {
10536                                 sctp_m_freem(a_chk->data);
10537                                 a_chk->data = NULL;
10538                         }
10539                         if (a_chk->whoTo) {
10540                                 sctp_free_remote_addr(a_chk->whoTo);
10541                                 a_chk->whoTo = NULL;
10542                         }
10543                         break;
10544                 }
10545         }
10546         if (a_chk == NULL) {
10547                 sctp_alloc_a_chunk(stcb, a_chk);
10548                 if (a_chk == NULL) {
10549                         /* No memory so we drop the idea, and set a timer */
10550                         if (stcb->asoc.delayed_ack) {
10551                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10552                                     stcb->sctp_ep, stcb, NULL,
10553                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10554                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10555                                     stcb->sctp_ep, stcb, NULL);
10556                         } else {
10557                                 stcb->asoc.send_sack = 1;
10558                         }
10559                         return;
10560                 }
10561                 a_chk->copy_by_ref = 0;
10562                 a_chk->rec.chunk_id.id = type;
10563                 a_chk->rec.chunk_id.can_take_data = 1;
10564         }
10565         /* Clear our pkt counts */
10566         asoc->data_pkts_seen = 0;
10567
10568         a_chk->flags = 0;
10569         a_chk->asoc = asoc;
10570         a_chk->snd_count = 0;
10571         a_chk->send_size = 0;   /* fill in later */
10572         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10573         a_chk->whoTo = NULL;
10574
10575         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10576                 /*-
10577                  * Ok, the destination for the SACK is unreachable, lets see if
10578                  * we can select an alternate to asoc->last_data_chunk_from
10579                  */
10580                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10581                 if (a_chk->whoTo == NULL) {
10582                         /* Nope, no alternate */
10583                         a_chk->whoTo = asoc->last_data_chunk_from;
10584                 }
10585         } else {
10586                 a_chk->whoTo = asoc->last_data_chunk_from;
10587         }
10588         if (a_chk->whoTo) {
10589                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10590         }
10591         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10592                 highest_tsn = asoc->highest_tsn_inside_map;
10593         } else {
10594                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10595         }
10596         if (highest_tsn == asoc->cumulative_tsn) {
10597                 /* no gaps */
10598                 if (type == SCTP_SELECTIVE_ACK) {
10599                         space_req = sizeof(struct sctp_sack_chunk);
10600                 } else {
10601                         space_req = sizeof(struct sctp_nr_sack_chunk);
10602                 }
10603         } else {
10604                 /* gaps get a cluster */
10605                 space_req = MCLBYTES;
10606         }
10607         /* Ok now lets formulate a MBUF with our sack */
10608         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10609         if ((a_chk->data == NULL) ||
10610             (a_chk->whoTo == NULL)) {
10611                 /* rats, no mbuf memory */
10612                 if (a_chk->data) {
10613                         /* was a problem with the destination */
10614                         sctp_m_freem(a_chk->data);
10615                         a_chk->data = NULL;
10616                 }
10617                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10618                 /* sa_ignore NO_NULL_CHK */
10619                 if (stcb->asoc.delayed_ack) {
10620                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10621                             stcb->sctp_ep, stcb, NULL,
10622                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10623                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10624                             stcb->sctp_ep, stcb, NULL);
10625                 } else {
10626                         stcb->asoc.send_sack = 1;
10627                 }
10628                 return;
10629         }
10630         /* ok, lets go through and fill it in */
10631         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10632         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10633         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10634                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10635         }
10636         limit = mtod(a_chk->data, caddr_t);
10637         limit += space;
10638
10639         flags = 0;
10640
10641         if ((asoc->sctp_cmt_on_off > 0) &&
10642             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10643                 /*-
10644                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10645                  * received, then set high bit to 1, else 0. Reset
10646                  * pkts_rcvd.
10647                  */
10648                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10649                 asoc->cmt_dac_pkts_rcvd = 0;
10650         }
10651 #ifdef SCTP_ASOCLOG_OF_TSNS
10652         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10653         stcb->asoc.cumack_log_atsnt++;
10654         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10655                 stcb->asoc.cumack_log_atsnt = 0;
10656         }
10657 #endif
10658         /* reset the readers interpretation */
10659         stcb->freed_by_sorcv_sincelast = 0;
10660
10661         if (type == SCTP_SELECTIVE_ACK) {
10662                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10663                 nr_sack = NULL;
10664                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10665                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10666                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10667                 } else {
10668                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10669                 }
10670         } else {
10671                 sack = NULL;
10672                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10673                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10674                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10675                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10676                 } else {
10677                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10678                 }
10679         }
10680
10681         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10682                 offset = 1;
10683         } else {
10684                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10685         }
10686         if (((type == SCTP_SELECTIVE_ACK) &&
10687             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10688             ((type == SCTP_NR_SELECTIVE_ACK) &&
10689             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10690                 /* we have a gap .. maybe */
10691                 for (i = 0; i < siz; i++) {
10692                         tsn_map = asoc->mapping_array[i];
10693                         if (type == SCTP_SELECTIVE_ACK) {
10694                                 tsn_map |= asoc->nr_mapping_array[i];
10695                         }
10696                         if (i == 0) {
10697                                 /*
10698                                  * Clear all bits corresponding to TSNs
10699                                  * smaller or equal to the cumulative TSN.
10700                                  */
10701                                 tsn_map &= (~0U << (1 - offset));
10702                         }
10703                         selector = &sack_array[tsn_map];
10704                         if (mergeable && selector->right_edge) {
10705                                 /*
10706                                  * Backup, left and right edges were ok to
10707                                  * merge.
10708                                  */
10709                                 num_gap_blocks--;
10710                                 gap_descriptor--;
10711                         }
10712                         if (selector->num_entries == 0)
10713                                 mergeable = 0;
10714                         else {
10715                                 for (j = 0; j < selector->num_entries; j++) {
10716                                         if (mergeable && selector->right_edge) {
10717                                                 /*
10718                                                  * do a merge by NOT setting
10719                                                  * the left side
10720                                                  */
10721                                                 mergeable = 0;
10722                                         } else {
10723                                                 /*
10724                                                  * no merge, set the left
10725                                                  * side
10726                                                  */
10727                                                 mergeable = 0;
10728                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10729                                         }
10730                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10731                                         num_gap_blocks++;
10732                                         gap_descriptor++;
10733                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10734                                                 /* no more room */
10735                                                 limit_reached = 1;
10736                                                 break;
10737                                         }
10738                                 }
10739                                 if (selector->left_edge) {
10740                                         mergeable = 1;
10741                                 }
10742                         }
10743                         if (limit_reached) {
10744                                 /* Reached the limit stop */
10745                                 break;
10746                         }
10747                         offset += 8;
10748                 }
10749         }
10750         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10751             (limit_reached == 0)) {
10752
10753                 mergeable = 0;
10754
10755                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10756                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10757                 } else {
10758                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10759                 }
10760
10761                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10762                         offset = 1;
10763                 } else {
10764                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10765                 }
10766                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10767                         /* we have a gap .. maybe */
10768                         for (i = 0; i < siz; i++) {
10769                                 tsn_map = asoc->nr_mapping_array[i];
10770                                 if (i == 0) {
10771                                         /*
10772                                          * Clear all bits corresponding to
10773                                          * TSNs smaller or equal to the
10774                                          * cumulative TSN.
10775                                          */
10776                                         tsn_map &= (~0U << (1 - offset));
10777                                 }
10778                                 selector = &sack_array[tsn_map];
10779                                 if (mergeable && selector->right_edge) {
10780                                         /*
10781                                          * Backup, left and right edges were
10782                                          * ok to merge.
10783                                          */
10784                                         num_nr_gap_blocks--;
10785                                         gap_descriptor--;
10786                                 }
10787                                 if (selector->num_entries == 0)
10788                                         mergeable = 0;
10789                                 else {
10790                                         for (j = 0; j < selector->num_entries; j++) {
10791                                                 if (mergeable && selector->right_edge) {
10792                                                         /*
10793                                                          * do a merge by NOT
10794                                                          * setting the left
10795                                                          * side
10796                                                          */
10797                                                         mergeable = 0;
10798                                                 } else {
10799                                                         /*
10800                                                          * no merge, set the
10801                                                          * left side
10802                                                          */
10803                                                         mergeable = 0;
10804                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10805                                                 }
10806                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10807                                                 num_nr_gap_blocks++;
10808                                                 gap_descriptor++;
10809                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10810                                                         /* no more room */
10811                                                         limit_reached = 1;
10812                                                         break;
10813                                                 }
10814                                         }
10815                                         if (selector->left_edge) {
10816                                                 mergeable = 1;
10817                                         }
10818                                 }
10819                                 if (limit_reached) {
10820                                         /* Reached the limit stop */
10821                                         break;
10822                                 }
10823                                 offset += 8;
10824                         }
10825                 }
10826         }
10827         /* now we must add any dups we are going to report. */
10828         if ((limit_reached == 0) && (asoc->numduptsns)) {
10829                 dup = (uint32_t *)gap_descriptor;
10830                 for (i = 0; i < asoc->numduptsns; i++) {
10831                         *dup = htonl(asoc->dup_tsns[i]);
10832                         dup++;
10833                         num_dups++;
10834                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10835                                 /* no more room */
10836                                 break;
10837                         }
10838                 }
10839                 asoc->numduptsns = 0;
10840         }
10841         /*
10842          * now that the chunk is prepared queue it to the control chunk
10843          * queue.
10844          */
10845         if (type == SCTP_SELECTIVE_ACK) {
10846                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10847                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10848                     num_dups * sizeof(int32_t));
10849                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10850                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10851                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10852                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10853                 sack->sack.num_dup_tsns = htons(num_dups);
10854                 sack->ch.chunk_type = type;
10855                 sack->ch.chunk_flags = flags;
10856                 sack->ch.chunk_length = htons(a_chk->send_size);
10857         } else {
10858                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10859                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10860                     num_dups * sizeof(int32_t));
10861                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10862                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10863                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10864                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10865                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10866                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10867                 nr_sack->nr_sack.reserved = 0;
10868                 nr_sack->ch.chunk_type = type;
10869                 nr_sack->ch.chunk_flags = flags;
10870                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10871         }
10872         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10873         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10874         asoc->ctrl_queue_cnt++;
10875         asoc->send_sack = 0;
10876         SCTP_STAT_INCR(sctps_sendsacks);
10877         return;
10878 }
10879
10880 void
10881 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10882 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10883     SCTP_UNUSED
10884 #endif
10885 )
10886 {
10887         struct mbuf *m_abort, *m, *m_last;
10888         struct mbuf *m_out, *m_end = NULL;
10889         struct sctp_abort_chunk *abort;
10890         struct sctp_auth_chunk *auth = NULL;
10891         struct sctp_nets *net;
10892         uint32_t vtag;
10893         uint32_t auth_offset = 0;
10894         int error;
10895         uint16_t cause_len, chunk_len, padding_len;
10896
10897         SCTP_TCB_LOCK_ASSERT(stcb);
10898         /*-
10899          * Add an AUTH chunk, if chunk requires it and save the offset into
10900          * the chain for AUTH
10901          */
10902         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10903             stcb->asoc.peer_auth_chunks)) {
10904                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10905                     stcb, SCTP_ABORT_ASSOCIATION);
10906                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10907         } else {
10908                 m_out = NULL;
10909         }
10910         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10911         if (m_abort == NULL) {
10912                 if (m_out) {
10913                         sctp_m_freem(m_out);
10914                 }
10915                 if (operr) {
10916                         sctp_m_freem(operr);
10917                 }
10918                 return;
10919         }
10920         /* link in any error */
10921         SCTP_BUF_NEXT(m_abort) = operr;
10922         cause_len = 0;
10923         m_last = NULL;
10924         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10925                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10926                 if (SCTP_BUF_NEXT(m) == NULL) {
10927                         m_last = m;
10928                 }
10929         }
10930         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10931         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10932         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10933         if (m_out == NULL) {
10934                 /* NO Auth chunk prepended, so reserve space in front */
10935                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10936                 m_out = m_abort;
10937         } else {
10938                 /* Put AUTH chunk at the front of the chain */
10939                 SCTP_BUF_NEXT(m_end) = m_abort;
10940         }
10941         if (stcb->asoc.alternate) {
10942                 net = stcb->asoc.alternate;
10943         } else {
10944                 net = stcb->asoc.primary_destination;
10945         }
10946         /* Fill in the ABORT chunk header. */
10947         abort = mtod(m_abort, struct sctp_abort_chunk *);
10948         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10949         if (stcb->asoc.peer_vtag == 0) {
10950                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10951                 vtag = stcb->asoc.my_vtag;
10952                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10953         } else {
10954                 vtag = stcb->asoc.peer_vtag;
10955                 abort->ch.chunk_flags = 0;
10956         }
10957         abort->ch.chunk_length = htons(chunk_len);
10958         /* Add padding, if necessary. */
10959         if (padding_len > 0) {
10960                 if ((m_last == NULL) ||
10961                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10962                         sctp_m_freem(m_out);
10963                         return;
10964                 }
10965         }
10966         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10967             (struct sockaddr *)&net->ro._l_addr,
10968             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10969             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10970             stcb->asoc.primary_destination->port, NULL,
10971             0, 0,
10972             so_locked))) {
10973                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10974                 if (error == ENOBUFS) {
10975                         stcb->asoc.ifp_had_enobuf = 1;
10976                         SCTP_STAT_INCR(sctps_lowlevelerr);
10977                 }
10978         } else {
10979                 stcb->asoc.ifp_had_enobuf = 0;
10980         }
10981         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10982 }
10983
10984 void
10985 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10986     struct sctp_nets *net,
10987     int reflect_vtag)
10988 {
10989         /* formulate and SEND a SHUTDOWN-COMPLETE */
10990         struct mbuf *m_shutdown_comp;
10991         struct sctp_shutdown_complete_chunk *shutdown_complete;
10992         uint32_t vtag;
10993         int error;
10994         uint8_t flags;
10995
10996         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10997         if (m_shutdown_comp == NULL) {
10998                 /* no mbuf's */
10999                 return;
11000         }
11001         if (reflect_vtag) {
11002                 flags = SCTP_HAD_NO_TCB;
11003                 vtag = stcb->asoc.my_vtag;
11004         } else {
11005                 flags = 0;
11006                 vtag = stcb->asoc.peer_vtag;
11007         }
11008         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11009         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11010         shutdown_complete->ch.chunk_flags = flags;
11011         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11012         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11013         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11014             (struct sockaddr *)&net->ro._l_addr,
11015             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11016             stcb->sctp_ep->sctp_lport, stcb->rport,
11017             htonl(vtag),
11018             net->port, NULL,
11019             0, 0,
11020             SCTP_SO_NOT_LOCKED))) {
11021                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11022                 if (error == ENOBUFS) {
11023                         stcb->asoc.ifp_had_enobuf = 1;
11024                         SCTP_STAT_INCR(sctps_lowlevelerr);
11025                 }
11026         } else {
11027                 stcb->asoc.ifp_had_enobuf = 0;
11028         }
11029         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11030         return;
11031 }
11032
11033 static void
11034 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11035     struct sctphdr *sh, uint32_t vtag,
11036     uint8_t type, struct mbuf *cause,
11037     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11038     uint32_t vrf_id, uint16_t port)
11039 {
11040         struct mbuf *o_pak;
11041         struct mbuf *mout;
11042         struct sctphdr *shout;
11043         struct sctp_chunkhdr *ch;
11044 #if defined(INET) || defined(INET6)
11045         struct udphdr *udp;
11046         int ret;
11047 #endif
11048         int len, cause_len, padding_len;
11049 #ifdef INET
11050         struct sockaddr_in *src_sin, *dst_sin;
11051         struct ip *ip;
11052 #endif
11053 #ifdef INET6
11054         struct sockaddr_in6 *src_sin6, *dst_sin6;
11055         struct ip6_hdr *ip6;
11056 #endif
11057
11058         /* Compute the length of the cause and add final padding. */
11059         cause_len = 0;
11060         if (cause != NULL) {
11061                 struct mbuf *m_at, *m_last = NULL;
11062
11063                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11064                         if (SCTP_BUF_NEXT(m_at) == NULL)
11065                                 m_last = m_at;
11066                         cause_len += SCTP_BUF_LEN(m_at);
11067                 }
11068                 padding_len = cause_len % 4;
11069                 if (padding_len != 0) {
11070                         padding_len = 4 - padding_len;
11071                 }
11072                 if (padding_len != 0) {
11073                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11074                                 sctp_m_freem(cause);
11075                                 return;
11076                         }
11077                 }
11078         } else {
11079                 padding_len = 0;
11080         }
11081         /* Get an mbuf for the header. */
11082         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11083         switch (dst->sa_family) {
11084 #ifdef INET
11085         case AF_INET:
11086                 len += sizeof(struct ip);
11087                 break;
11088 #endif
11089 #ifdef INET6
11090         case AF_INET6:
11091                 len += sizeof(struct ip6_hdr);
11092                 break;
11093 #endif
11094         default:
11095                 break;
11096         }
11097 #if defined(INET) || defined(INET6)
11098         if (port) {
11099                 len += sizeof(struct udphdr);
11100         }
11101 #endif
11102         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11103         if (mout == NULL) {
11104                 if (cause) {
11105                         sctp_m_freem(cause);
11106                 }
11107                 return;
11108         }
11109         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11110         SCTP_BUF_LEN(mout) = len;
11111         SCTP_BUF_NEXT(mout) = cause;
11112         M_SETFIB(mout, fibnum);
11113         mout->m_pkthdr.flowid = mflowid;
11114         M_HASHTYPE_SET(mout, mflowtype);
11115 #ifdef INET
11116         ip = NULL;
11117 #endif
11118 #ifdef INET6
11119         ip6 = NULL;
11120 #endif
11121         switch (dst->sa_family) {
11122 #ifdef INET
11123         case AF_INET:
11124                 src_sin = (struct sockaddr_in *)src;
11125                 dst_sin = (struct sockaddr_in *)dst;
11126                 ip = mtod(mout, struct ip *);
11127                 ip->ip_v = IPVERSION;
11128                 ip->ip_hl = (sizeof(struct ip) >> 2);
11129                 ip->ip_tos = 0;
11130                 ip->ip_off = htons(IP_DF);
11131                 ip_fillid(ip);
11132                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11133                 if (port) {
11134                         ip->ip_p = IPPROTO_UDP;
11135                 } else {
11136                         ip->ip_p = IPPROTO_SCTP;
11137                 }
11138                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11139                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11140                 ip->ip_sum = 0;
11141                 len = sizeof(struct ip);
11142                 shout = (struct sctphdr *)((caddr_t)ip + len);
11143                 break;
11144 #endif
11145 #ifdef INET6
11146         case AF_INET6:
11147                 src_sin6 = (struct sockaddr_in6 *)src;
11148                 dst_sin6 = (struct sockaddr_in6 *)dst;
11149                 ip6 = mtod(mout, struct ip6_hdr *);
11150                 ip6->ip6_flow = htonl(0x60000000);
11151                 if (V_ip6_auto_flowlabel) {
11152                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11153                 }
11154                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11155                 if (port) {
11156                         ip6->ip6_nxt = IPPROTO_UDP;
11157                 } else {
11158                         ip6->ip6_nxt = IPPROTO_SCTP;
11159                 }
11160                 ip6->ip6_src = dst_sin6->sin6_addr;
11161                 ip6->ip6_dst = src_sin6->sin6_addr;
11162                 len = sizeof(struct ip6_hdr);
11163                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11164                 break;
11165 #endif
11166         default:
11167                 len = 0;
11168                 shout = mtod(mout, struct sctphdr *);
11169                 break;
11170         }
11171 #if defined(INET) || defined(INET6)
11172         if (port) {
11173                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11174                         sctp_m_freem(mout);
11175                         return;
11176                 }
11177                 udp = (struct udphdr *)shout;
11178                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11179                 udp->uh_dport = port;
11180                 udp->uh_sum = 0;
11181                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11182                     sizeof(struct sctphdr) +
11183                     sizeof(struct sctp_chunkhdr) +
11184                     cause_len + padding_len));
11185                 len += sizeof(struct udphdr);
11186                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11187         } else {
11188                 udp = NULL;
11189         }
11190 #endif
11191         shout->src_port = sh->dest_port;
11192         shout->dest_port = sh->src_port;
11193         shout->checksum = 0;
11194         if (vtag) {
11195                 shout->v_tag = htonl(vtag);
11196         } else {
11197                 shout->v_tag = sh->v_tag;
11198         }
11199         len += sizeof(struct sctphdr);
11200         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11201         ch->chunk_type = type;
11202         if (vtag) {
11203                 ch->chunk_flags = 0;
11204         } else {
11205                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11206         }
11207         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11208         len += sizeof(struct sctp_chunkhdr);
11209         len += cause_len + padding_len;
11210
11211         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11212                 sctp_m_freem(mout);
11213                 return;
11214         }
11215         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11216         switch (dst->sa_family) {
11217 #ifdef INET
11218         case AF_INET:
11219                 if (port) {
11220                         if (V_udp_cksum) {
11221                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11222                         } else {
11223                                 udp->uh_sum = 0;
11224                         }
11225                 }
11226                 ip->ip_len = htons(len);
11227                 if (port) {
11228 #if defined(SCTP_WITH_NO_CSUM)
11229                         SCTP_STAT_INCR(sctps_sendnocrc);
11230 #else
11231                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11232                         SCTP_STAT_INCR(sctps_sendswcrc);
11233 #endif
11234                         if (V_udp_cksum) {
11235                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11236                         }
11237                 } else {
11238 #if defined(SCTP_WITH_NO_CSUM)
11239                         SCTP_STAT_INCR(sctps_sendnocrc);
11240 #else
11241                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11242                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11243                         SCTP_STAT_INCR(sctps_sendhwcrc);
11244 #endif
11245                 }
11246 #ifdef SCTP_PACKET_LOGGING
11247                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11248                         sctp_packet_log(o_pak);
11249                 }
11250 #endif
11251                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11252                 break;
11253 #endif
11254 #ifdef INET6
11255         case AF_INET6:
11256                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11257                 if (port) {
11258 #if defined(SCTP_WITH_NO_CSUM)
11259                         SCTP_STAT_INCR(sctps_sendnocrc);
11260 #else
11261                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11262                         SCTP_STAT_INCR(sctps_sendswcrc);
11263 #endif
11264                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11265                                 udp->uh_sum = 0xffff;
11266                         }
11267                 } else {
11268 #if defined(SCTP_WITH_NO_CSUM)
11269                         SCTP_STAT_INCR(sctps_sendnocrc);
11270 #else
11271                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11272                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11273                         SCTP_STAT_INCR(sctps_sendhwcrc);
11274 #endif
11275                 }
11276 #ifdef SCTP_PACKET_LOGGING
11277                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11278                         sctp_packet_log(o_pak);
11279                 }
11280 #endif
11281                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11282                 break;
11283 #endif
11284         default:
11285                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11286                     dst->sa_family);
11287                 sctp_m_freem(mout);
11288                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11289                 return;
11290         }
11291         SCTP_STAT_INCR(sctps_sendpackets);
11292         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11293         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11294         return;
11295 }
11296
11297 void
11298 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11299     struct sctphdr *sh,
11300     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11301     uint32_t vrf_id, uint16_t port)
11302 {
11303         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11304             mflowtype, mflowid, fibnum,
11305             vrf_id, port);
11306 }
11307
11308 void
11309 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11310 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11311     SCTP_UNUSED
11312 #endif
11313 )
11314 {
11315         struct sctp_tmit_chunk *chk;
11316         struct sctp_heartbeat_chunk *hb;
11317         struct timeval now;
11318
11319         SCTP_TCB_LOCK_ASSERT(stcb);
11320         if (net == NULL) {
11321                 return;
11322         }
11323         (void)SCTP_GETTIME_TIMEVAL(&now);
11324         switch (net->ro._l_addr.sa.sa_family) {
11325 #ifdef INET
11326         case AF_INET:
11327                 break;
11328 #endif
11329 #ifdef INET6
11330         case AF_INET6:
11331                 break;
11332 #endif
11333         default:
11334                 return;
11335         }
11336         sctp_alloc_a_chunk(stcb, chk);
11337         if (chk == NULL) {
11338                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11339                 return;
11340         }
11341         chk->copy_by_ref = 0;
11342         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11343         chk->rec.chunk_id.can_take_data = 1;
11344         chk->flags = 0;
11345         chk->asoc = &stcb->asoc;
11346         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11347
11348         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11349         if (chk->data == NULL) {
11350                 sctp_free_a_chunk(stcb, chk, so_locked);
11351                 return;
11352         }
11353         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11354         SCTP_BUF_LEN(chk->data) = chk->send_size;
11355         chk->sent = SCTP_DATAGRAM_UNSENT;
11356         chk->snd_count = 0;
11357         chk->whoTo = net;
11358         atomic_add_int(&chk->whoTo->ref_count, 1);
11359         /* Now we have a mbuf that we can fill in with the details */
11360         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11361         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11362         /* fill out chunk header */
11363         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11364         hb->ch.chunk_flags = 0;
11365         hb->ch.chunk_length = htons(chk->send_size);
11366         /* Fill out hb parameter */
11367         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11368         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11369         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11370         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11371         /* Did our user request this one, put it in */
11372         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11373         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11374         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11375                 /*
11376                  * we only take from the entropy pool if the address is not
11377                  * confirmed.
11378                  */
11379                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11380                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11381         } else {
11382                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11383                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11384         }
11385         switch (net->ro._l_addr.sa.sa_family) {
11386 #ifdef INET
11387         case AF_INET:
11388                 memcpy(hb->heartbeat.hb_info.address,
11389                     &net->ro._l_addr.sin.sin_addr,
11390                     sizeof(net->ro._l_addr.sin.sin_addr));
11391                 break;
11392 #endif
11393 #ifdef INET6
11394         case AF_INET6:
11395                 memcpy(hb->heartbeat.hb_info.address,
11396                     &net->ro._l_addr.sin6.sin6_addr,
11397                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11398                 break;
11399 #endif
11400         default:
11401                 if (chk->data) {
11402                         sctp_m_freem(chk->data);
11403                         chk->data = NULL;
11404                 }
11405                 sctp_free_a_chunk(stcb, chk, so_locked);
11406                 return;
11407                 break;
11408         }
11409         net->hb_responded = 0;
11410         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11411         stcb->asoc.ctrl_queue_cnt++;
11412         SCTP_STAT_INCR(sctps_sendheartbeat);
11413         return;
11414 }
11415
11416 void
11417 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11418     uint32_t high_tsn)
11419 {
11420         struct sctp_association *asoc;
11421         struct sctp_ecne_chunk *ecne;
11422         struct sctp_tmit_chunk *chk;
11423
11424         if (net == NULL) {
11425                 return;
11426         }
11427         asoc = &stcb->asoc;
11428         SCTP_TCB_LOCK_ASSERT(stcb);
11429         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11430                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11431                         /* found a previous ECN_ECHO update it if needed */
11432                         uint32_t cnt, ctsn;
11433
11434                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11435                         ctsn = ntohl(ecne->tsn);
11436                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11437                                 ecne->tsn = htonl(high_tsn);
11438                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11439                         }
11440                         cnt = ntohl(ecne->num_pkts_since_cwr);
11441                         cnt++;
11442                         ecne->num_pkts_since_cwr = htonl(cnt);
11443                         return;
11444                 }
11445         }
11446         /* nope could not find one to update so we must build one */
11447         sctp_alloc_a_chunk(stcb, chk);
11448         if (chk == NULL) {
11449                 return;
11450         }
11451         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11452         chk->copy_by_ref = 0;
11453         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11454         chk->rec.chunk_id.can_take_data = 0;
11455         chk->flags = 0;
11456         chk->asoc = &stcb->asoc;
11457         chk->send_size = sizeof(struct sctp_ecne_chunk);
11458         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11459         if (chk->data == NULL) {
11460                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11461                 return;
11462         }
11463         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11464         SCTP_BUF_LEN(chk->data) = chk->send_size;
11465         chk->sent = SCTP_DATAGRAM_UNSENT;
11466         chk->snd_count = 0;
11467         chk->whoTo = net;
11468         atomic_add_int(&chk->whoTo->ref_count, 1);
11469
11470         stcb->asoc.ecn_echo_cnt_onq++;
11471         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11472         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11473         ecne->ch.chunk_flags = 0;
11474         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11475         ecne->tsn = htonl(high_tsn);
11476         ecne->num_pkts_since_cwr = htonl(1);
11477         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11478         asoc->ctrl_queue_cnt++;
11479 }
11480
11481 void
11482 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11483     struct mbuf *m, int len, int iphlen, int bad_crc)
11484 {
11485         struct sctp_association *asoc;
11486         struct sctp_pktdrop_chunk *drp;
11487         struct sctp_tmit_chunk *chk;
11488         uint8_t *datap;
11489         int was_trunc = 0;
11490         int fullsz = 0;
11491         long spc;
11492         int offset;
11493         struct sctp_chunkhdr *ch, chunk_buf;
11494         unsigned int chk_length;
11495
11496         if (!stcb) {
11497                 return;
11498         }
11499         asoc = &stcb->asoc;
11500         SCTP_TCB_LOCK_ASSERT(stcb);
11501         if (asoc->pktdrop_supported == 0) {
11502                 /*-
11503                  * peer must declare support before I send one.
11504                  */
11505                 return;
11506         }
11507         if (stcb->sctp_socket == NULL) {
11508                 return;
11509         }
11510         sctp_alloc_a_chunk(stcb, chk);
11511         if (chk == NULL) {
11512                 return;
11513         }
11514         chk->copy_by_ref = 0;
11515         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11516         chk->rec.chunk_id.can_take_data = 1;
11517         chk->flags = 0;
11518         len -= iphlen;
11519         chk->send_size = len;
11520         /* Validate that we do not have an ABORT in here. */
11521         offset = iphlen + sizeof(struct sctphdr);
11522         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11523             sizeof(*ch), (uint8_t *)&chunk_buf);
11524         while (ch != NULL) {
11525                 chk_length = ntohs(ch->chunk_length);
11526                 if (chk_length < sizeof(*ch)) {
11527                         /* break to abort land */
11528                         break;
11529                 }
11530                 switch (ch->chunk_type) {
11531                 case SCTP_PACKET_DROPPED:
11532                 case SCTP_ABORT_ASSOCIATION:
11533                 case SCTP_INITIATION_ACK:
11534                         /**
11535                          * We don't respond with an PKT-DROP to an ABORT
11536                          * or PKT-DROP. We also do not respond to an
11537                          * INIT-ACK, because we can't know if the initiation
11538                          * tag is correct or not.
11539                          */
11540                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11541                         return;
11542                 default:
11543                         break;
11544                 }
11545                 offset += SCTP_SIZE32(chk_length);
11546                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11547                     sizeof(*ch), (uint8_t *)&chunk_buf);
11548         }
11549
11550         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11551             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11552                 /*
11553                  * only send 1 mtu worth, trim off the excess on the end.
11554                  */
11555                 fullsz = len;
11556                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11557                 was_trunc = 1;
11558         }
11559         chk->asoc = &stcb->asoc;
11560         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11561         if (chk->data == NULL) {
11562 jump_out:
11563                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11564                 return;
11565         }
11566         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11567         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11568         if (drp == NULL) {
11569                 sctp_m_freem(chk->data);
11570                 chk->data = NULL;
11571                 goto jump_out;
11572         }
11573         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11574             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11575         chk->book_size_scale = 0;
11576         if (was_trunc) {
11577                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11578                 drp->trunc_len = htons(fullsz);
11579                 /*
11580                  * Len is already adjusted to size minus overhead above take
11581                  * out the pkt_drop chunk itself from it.
11582                  */
11583                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11584                 len = chk->send_size;
11585         } else {
11586                 /* no truncation needed */
11587                 drp->ch.chunk_flags = 0;
11588                 drp->trunc_len = htons(0);
11589         }
11590         if (bad_crc) {
11591                 drp->ch.chunk_flags |= SCTP_BADCRC;
11592         }
11593         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11594         SCTP_BUF_LEN(chk->data) = chk->send_size;
11595         chk->sent = SCTP_DATAGRAM_UNSENT;
11596         chk->snd_count = 0;
11597         if (net) {
11598                 /* we should hit here */
11599                 chk->whoTo = net;
11600                 atomic_add_int(&chk->whoTo->ref_count, 1);
11601         } else {
11602                 chk->whoTo = NULL;
11603         }
11604         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11605         drp->ch.chunk_length = htons(chk->send_size);
11606         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11607         if (spc < 0) {
11608                 spc = 0;
11609         }
11610         drp->bottle_bw = htonl(spc);
11611         if (asoc->my_rwnd) {
11612                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11613                     asoc->size_on_all_streams +
11614                     asoc->my_rwnd_control_len +
11615                     stcb->sctp_socket->so_rcv.sb_cc);
11616         } else {
11617                 /*-
11618                  * If my rwnd is 0, possibly from mbuf depletion as well as
11619                  * space used, tell the peer there is NO space aka onq == bw
11620                  */
11621                 drp->current_onq = htonl(spc);
11622         }
11623         drp->reserved = 0;
11624         datap = drp->data;
11625         m_copydata(m, iphlen, len, (caddr_t)datap);
11626         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11627         asoc->ctrl_queue_cnt++;
11628 }
11629
11630 void
11631 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11632 {
11633         struct sctp_association *asoc;
11634         struct sctp_cwr_chunk *cwr;
11635         struct sctp_tmit_chunk *chk;
11636
11637         SCTP_TCB_LOCK_ASSERT(stcb);
11638         if (net == NULL) {
11639                 return;
11640         }
11641         asoc = &stcb->asoc;
11642         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11643                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11644                         /*
11645                          * found a previous CWR queued to same destination
11646                          * update it if needed
11647                          */
11648                         uint32_t ctsn;
11649
11650                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11651                         ctsn = ntohl(cwr->tsn);
11652                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11653                                 cwr->tsn = htonl(high_tsn);
11654                         }
11655                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11656                                 /* Make sure override is carried */
11657                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11658                         }
11659                         return;
11660                 }
11661         }
11662         sctp_alloc_a_chunk(stcb, chk);
11663         if (chk == NULL) {
11664                 return;
11665         }
11666         chk->copy_by_ref = 0;
11667         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11668         chk->rec.chunk_id.can_take_data = 1;
11669         chk->flags = 0;
11670         chk->asoc = &stcb->asoc;
11671         chk->send_size = sizeof(struct sctp_cwr_chunk);
11672         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11673         if (chk->data == NULL) {
11674                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11675                 return;
11676         }
11677         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11678         SCTP_BUF_LEN(chk->data) = chk->send_size;
11679         chk->sent = SCTP_DATAGRAM_UNSENT;
11680         chk->snd_count = 0;
11681         chk->whoTo = net;
11682         atomic_add_int(&chk->whoTo->ref_count, 1);
11683         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11684         cwr->ch.chunk_type = SCTP_ECN_CWR;
11685         cwr->ch.chunk_flags = override;
11686         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11687         cwr->tsn = htonl(high_tsn);
11688         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11689         asoc->ctrl_queue_cnt++;
11690 }
11691
11692 static int
11693 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11694     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11695 {
11696         uint16_t len, old_len, i;
11697         struct sctp_stream_reset_out_request *req_out;
11698         struct sctp_chunkhdr *ch;
11699         int at;
11700         int number_entries = 0;
11701
11702         ch = mtod(chk->data, struct sctp_chunkhdr *);
11703         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11704         /* get to new offset for the param. */
11705         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11706         /* now how long will this param be? */
11707         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11708                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11709                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11710                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11711                         number_entries++;
11712                 }
11713         }
11714         if (number_entries == 0) {
11715                 return (0);
11716         }
11717         if (number_entries == stcb->asoc.streamoutcnt) {
11718                 number_entries = 0;
11719         }
11720         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11721                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11722         }
11723         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11724         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11725         req_out->ph.param_length = htons(len);
11726         req_out->request_seq = htonl(seq);
11727         req_out->response_seq = htonl(resp_seq);
11728         req_out->send_reset_at_tsn = htonl(last_sent);
11729         at = 0;
11730         if (number_entries) {
11731                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11732                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11733                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11734                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11735                                 req_out->list_of_streams[at] = htons(i);
11736                                 at++;
11737                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11738                                 if (at >= number_entries) {
11739                                         break;
11740                                 }
11741                         }
11742                 }
11743         } else {
11744                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11745                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11746                 }
11747         }
11748         if (SCTP_SIZE32(len) > len) {
11749                 /*-
11750                  * Need to worry about the pad we may end up adding to the
11751                  * end. This is easy since the struct is either aligned to 4
11752                  * bytes or 2 bytes off.
11753                  */
11754                 req_out->list_of_streams[number_entries] = 0;
11755         }
11756         /* now fix the chunk length */
11757         ch->chunk_length = htons(len + old_len);
11758         chk->book_size = len + old_len;
11759         chk->book_size_scale = 0;
11760         chk->send_size = SCTP_SIZE32(chk->book_size);
11761         SCTP_BUF_LEN(chk->data) = chk->send_size;
11762         return (1);
11763 }
11764
11765 static void
11766 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11767     int number_entries, uint16_t *list,
11768     uint32_t seq)
11769 {
11770         uint16_t len, old_len, i;
11771         struct sctp_stream_reset_in_request *req_in;
11772         struct sctp_chunkhdr *ch;
11773
11774         ch = mtod(chk->data, struct sctp_chunkhdr *);
11775         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11776
11777         /* get to new offset for the param. */
11778         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11779         /* now how long will this param be? */
11780         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11781         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11782         req_in->ph.param_length = htons(len);
11783         req_in->request_seq = htonl(seq);
11784         if (number_entries) {
11785                 for (i = 0; i < number_entries; i++) {
11786                         req_in->list_of_streams[i] = htons(list[i]);
11787                 }
11788         }
11789         if (SCTP_SIZE32(len) > len) {
11790                 /*-
11791                  * Need to worry about the pad we may end up adding to the
11792                  * end. This is easy since the struct is either aligned to 4
11793                  * bytes or 2 bytes off.
11794                  */
11795                 req_in->list_of_streams[number_entries] = 0;
11796         }
11797         /* now fix the chunk length */
11798         ch->chunk_length = htons(len + old_len);
11799         chk->book_size = len + old_len;
11800         chk->book_size_scale = 0;
11801         chk->send_size = SCTP_SIZE32(chk->book_size);
11802         SCTP_BUF_LEN(chk->data) = chk->send_size;
11803         return;
11804 }
11805
11806 static void
11807 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11808     uint32_t seq)
11809 {
11810         uint16_t len, old_len;
11811         struct sctp_stream_reset_tsn_request *req_tsn;
11812         struct sctp_chunkhdr *ch;
11813
11814         ch = mtod(chk->data, struct sctp_chunkhdr *);
11815         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11816
11817         /* get to new offset for the param. */
11818         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11819         /* now how long will this param be? */
11820         len = sizeof(struct sctp_stream_reset_tsn_request);
11821         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11822         req_tsn->ph.param_length = htons(len);
11823         req_tsn->request_seq = htonl(seq);
11824
11825         /* now fix the chunk length */
11826         ch->chunk_length = htons(len + old_len);
11827         chk->send_size = len + old_len;
11828         chk->book_size = SCTP_SIZE32(chk->send_size);
11829         chk->book_size_scale = 0;
11830         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11831         return;
11832 }
11833
11834 void
11835 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11836     uint32_t resp_seq, uint32_t result)
11837 {
11838         uint16_t len, old_len;
11839         struct sctp_stream_reset_response *resp;
11840         struct sctp_chunkhdr *ch;
11841
11842         ch = mtod(chk->data, struct sctp_chunkhdr *);
11843         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11844
11845         /* get to new offset for the param. */
11846         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11847         /* now how long will this param be? */
11848         len = sizeof(struct sctp_stream_reset_response);
11849         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11850         resp->ph.param_length = htons(len);
11851         resp->response_seq = htonl(resp_seq);
11852         resp->result = ntohl(result);
11853
11854         /* now fix the chunk length */
11855         ch->chunk_length = htons(len + old_len);
11856         chk->book_size = len + old_len;
11857         chk->book_size_scale = 0;
11858         chk->send_size = SCTP_SIZE32(chk->book_size);
11859         SCTP_BUF_LEN(chk->data) = chk->send_size;
11860         return;
11861 }
11862
11863 void
11864 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11865     struct sctp_stream_reset_list *ent,
11866     int response)
11867 {
11868         struct sctp_association *asoc;
11869         struct sctp_tmit_chunk *chk;
11870         struct sctp_chunkhdr *ch;
11871
11872         asoc = &stcb->asoc;
11873
11874         /*
11875          * Reset our last reset action to the new one IP -> response
11876          * (PERFORMED probably). This assures that if we fail to send, a
11877          * retran from the peer will get the new response.
11878          */
11879         asoc->last_reset_action[0] = response;
11880         if (asoc->stream_reset_outstanding) {
11881                 return;
11882         }
11883         sctp_alloc_a_chunk(stcb, chk);
11884         if (chk == NULL) {
11885                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11886                 return;
11887         }
11888         chk->copy_by_ref = 0;
11889         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11890         chk->rec.chunk_id.can_take_data = 0;
11891         chk->flags = 0;
11892         chk->asoc = &stcb->asoc;
11893         chk->book_size = sizeof(struct sctp_chunkhdr);
11894         chk->send_size = SCTP_SIZE32(chk->book_size);
11895         chk->book_size_scale = 0;
11896         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11897         if (chk->data == NULL) {
11898                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11899                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11900                 return;
11901         }
11902         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11903         /* setup chunk parameters */
11904         chk->sent = SCTP_DATAGRAM_UNSENT;
11905         chk->snd_count = 0;
11906         if (stcb->asoc.alternate) {
11907                 chk->whoTo = stcb->asoc.alternate;
11908         } else {
11909                 chk->whoTo = stcb->asoc.primary_destination;
11910         }
11911         ch = mtod(chk->data, struct sctp_chunkhdr *);
11912         ch->chunk_type = SCTP_STREAM_RESET;
11913         ch->chunk_flags = 0;
11914         ch->chunk_length = htons(chk->book_size);
11915         atomic_add_int(&chk->whoTo->ref_count, 1);
11916         SCTP_BUF_LEN(chk->data) = chk->send_size;
11917         sctp_add_stream_reset_result(chk, ent->seq, response);
11918         /* insert the chunk for sending */
11919         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11920             chk,
11921             sctp_next);
11922         asoc->ctrl_queue_cnt++;
11923 }
11924
11925 void
11926 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11927     uint32_t resp_seq, uint32_t result,
11928     uint32_t send_una, uint32_t recv_next)
11929 {
11930         uint16_t len, old_len;
11931         struct sctp_stream_reset_response_tsn *resp;
11932         struct sctp_chunkhdr *ch;
11933
11934         ch = mtod(chk->data, struct sctp_chunkhdr *);
11935         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11936
11937         /* get to new offset for the param. */
11938         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11939         /* now how long will this param be? */
11940         len = sizeof(struct sctp_stream_reset_response_tsn);
11941         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11942         resp->ph.param_length = htons(len);
11943         resp->response_seq = htonl(resp_seq);
11944         resp->result = htonl(result);
11945         resp->senders_next_tsn = htonl(send_una);
11946         resp->receivers_next_tsn = htonl(recv_next);
11947
11948         /* now fix the chunk length */
11949         ch->chunk_length = htons(len + old_len);
11950         chk->book_size = len + old_len;
11951         chk->send_size = SCTP_SIZE32(chk->book_size);
11952         chk->book_size_scale = 0;
11953         SCTP_BUF_LEN(chk->data) = chk->send_size;
11954         return;
11955 }
11956
11957 static void
11958 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11959     uint32_t seq,
11960     uint16_t adding)
11961 {
11962         uint16_t len, old_len;
11963         struct sctp_chunkhdr *ch;
11964         struct sctp_stream_reset_add_strm *addstr;
11965
11966         ch = mtod(chk->data, struct sctp_chunkhdr *);
11967         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11968
11969         /* get to new offset for the param. */
11970         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11971         /* now how long will this param be? */
11972         len = sizeof(struct sctp_stream_reset_add_strm);
11973
11974         /* Fill it out. */
11975         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11976         addstr->ph.param_length = htons(len);
11977         addstr->request_seq = htonl(seq);
11978         addstr->number_of_streams = htons(adding);
11979         addstr->reserved = 0;
11980
11981         /* now fix the chunk length */
11982         ch->chunk_length = htons(len + old_len);
11983         chk->send_size = len + old_len;
11984         chk->book_size = SCTP_SIZE32(chk->send_size);
11985         chk->book_size_scale = 0;
11986         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11987         return;
11988 }
11989
11990 static void
11991 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11992     uint32_t seq,
11993     uint16_t adding)
11994 {
11995         uint16_t len, old_len;
11996         struct sctp_chunkhdr *ch;
11997         struct sctp_stream_reset_add_strm *addstr;
11998
11999         ch = mtod(chk->data, struct sctp_chunkhdr *);
12000         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12001
12002         /* get to new offset for the param. */
12003         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12004         /* now how long will this param be? */
12005         len = sizeof(struct sctp_stream_reset_add_strm);
12006         /* Fill it out. */
12007         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12008         addstr->ph.param_length = htons(len);
12009         addstr->request_seq = htonl(seq);
12010         addstr->number_of_streams = htons(adding);
12011         addstr->reserved = 0;
12012
12013         /* now fix the chunk length */
12014         ch->chunk_length = htons(len + old_len);
12015         chk->send_size = len + old_len;
12016         chk->book_size = SCTP_SIZE32(chk->send_size);
12017         chk->book_size_scale = 0;
12018         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12019         return;
12020 }
12021
12022 int
12023 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12024 {
12025         struct sctp_association *asoc;
12026         struct sctp_tmit_chunk *chk;
12027         struct sctp_chunkhdr *ch;
12028         uint32_t seq;
12029
12030         asoc = &stcb->asoc;
12031         asoc->trigger_reset = 0;
12032         if (asoc->stream_reset_outstanding) {
12033                 return (EALREADY);
12034         }
12035         sctp_alloc_a_chunk(stcb, chk);
12036         if (chk == NULL) {
12037                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12038                 return (ENOMEM);
12039         }
12040         chk->copy_by_ref = 0;
12041         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12042         chk->rec.chunk_id.can_take_data = 0;
12043         chk->flags = 0;
12044         chk->asoc = &stcb->asoc;
12045         chk->book_size = sizeof(struct sctp_chunkhdr);
12046         chk->send_size = SCTP_SIZE32(chk->book_size);
12047         chk->book_size_scale = 0;
12048         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12049         if (chk->data == NULL) {
12050                 sctp_free_a_chunk(stcb, chk, so_locked);
12051                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12052                 return (ENOMEM);
12053         }
12054         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12055
12056         /* setup chunk parameters */
12057         chk->sent = SCTP_DATAGRAM_UNSENT;
12058         chk->snd_count = 0;
12059         if (stcb->asoc.alternate) {
12060                 chk->whoTo = stcb->asoc.alternate;
12061         } else {
12062                 chk->whoTo = stcb->asoc.primary_destination;
12063         }
12064         ch = mtod(chk->data, struct sctp_chunkhdr *);
12065         ch->chunk_type = SCTP_STREAM_RESET;
12066         ch->chunk_flags = 0;
12067         ch->chunk_length = htons(chk->book_size);
12068         atomic_add_int(&chk->whoTo->ref_count, 1);
12069         SCTP_BUF_LEN(chk->data) = chk->send_size;
12070         seq = stcb->asoc.str_reset_seq_out;
12071         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12072                 seq++;
12073                 asoc->stream_reset_outstanding++;
12074         } else {
12075                 m_freem(chk->data);
12076                 chk->data = NULL;
12077                 sctp_free_a_chunk(stcb, chk, so_locked);
12078                 return (ENOENT);
12079         }
12080         asoc->str_reset = chk;
12081         /* insert the chunk for sending */
12082         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12083             chk,
12084             sctp_next);
12085         asoc->ctrl_queue_cnt++;
12086
12087         if (stcb->asoc.send_sack) {
12088                 sctp_send_sack(stcb, so_locked);
12089         }
12090         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12091         return (0);
12092 }
12093
12094 int
12095 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12096     uint16_t number_entries, uint16_t *list,
12097     uint8_t send_in_req,
12098     uint8_t send_tsn_req,
12099     uint8_t add_stream,
12100     uint16_t adding_o,
12101     uint16_t adding_i, uint8_t peer_asked)
12102 {
12103         struct sctp_association *asoc;
12104         struct sctp_tmit_chunk *chk;
12105         struct sctp_chunkhdr *ch;
12106         int can_send_out_req = 0;
12107         uint32_t seq;
12108
12109         asoc = &stcb->asoc;
12110         if (asoc->stream_reset_outstanding) {
12111                 /*-
12112                  * Already one pending, must get ACK back to clear the flag.
12113                  */
12114                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12115                 return (EBUSY);
12116         }
12117         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12118             (add_stream == 0)) {
12119                 /* nothing to do */
12120                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12121                 return (EINVAL);
12122         }
12123         if (send_tsn_req && send_in_req) {
12124                 /* error, can't do that */
12125                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12126                 return (EINVAL);
12127         } else if (send_in_req) {
12128                 can_send_out_req = 1;
12129         }
12130         if (number_entries > (MCLBYTES -
12131             SCTP_MIN_OVERHEAD -
12132             sizeof(struct sctp_chunkhdr) -
12133             sizeof(struct sctp_stream_reset_out_request)) /
12134             sizeof(uint16_t)) {
12135                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12136                 return (ENOMEM);
12137         }
12138         sctp_alloc_a_chunk(stcb, chk);
12139         if (chk == NULL) {
12140                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12141                 return (ENOMEM);
12142         }
12143         chk->copy_by_ref = 0;
12144         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12145         chk->rec.chunk_id.can_take_data = 0;
12146         chk->flags = 0;
12147         chk->asoc = &stcb->asoc;
12148         chk->book_size = sizeof(struct sctp_chunkhdr);
12149         chk->send_size = SCTP_SIZE32(chk->book_size);
12150         chk->book_size_scale = 0;
12151
12152         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12153         if (chk->data == NULL) {
12154                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12155                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12156                 return (ENOMEM);
12157         }
12158         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12159
12160         /* setup chunk parameters */
12161         chk->sent = SCTP_DATAGRAM_UNSENT;
12162         chk->snd_count = 0;
12163         if (stcb->asoc.alternate) {
12164                 chk->whoTo = stcb->asoc.alternate;
12165         } else {
12166                 chk->whoTo = stcb->asoc.primary_destination;
12167         }
12168         atomic_add_int(&chk->whoTo->ref_count, 1);
12169         ch = mtod(chk->data, struct sctp_chunkhdr *);
12170         ch->chunk_type = SCTP_STREAM_RESET;
12171         ch->chunk_flags = 0;
12172         ch->chunk_length = htons(chk->book_size);
12173         SCTP_BUF_LEN(chk->data) = chk->send_size;
12174
12175         seq = stcb->asoc.str_reset_seq_out;
12176         if (can_send_out_req) {
12177                 int ret;
12178
12179                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12180                 if (ret) {
12181                         seq++;
12182                         asoc->stream_reset_outstanding++;
12183                 }
12184         }
12185         if ((add_stream & 1) &&
12186             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12187                 /* Need to allocate more */
12188                 struct sctp_stream_out *oldstream;
12189                 struct sctp_stream_queue_pending *sp, *nsp;
12190                 int i;
12191 #if defined(SCTP_DETAILED_STR_STATS)
12192                 int j;
12193 #endif
12194
12195                 oldstream = stcb->asoc.strmout;
12196                 /* get some more */
12197                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12198                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12199                     SCTP_M_STRMO);
12200                 if (stcb->asoc.strmout == NULL) {
12201                         uint8_t x;
12202
12203                         stcb->asoc.strmout = oldstream;
12204                         /* Turn off the bit */
12205                         x = add_stream & 0xfe;
12206                         add_stream = x;
12207                         goto skip_stuff;
12208                 }
12209                 /*
12210                  * Ok now we proceed with copying the old out stuff and
12211                  * initializing the new stuff.
12212                  */
12213                 SCTP_TCB_SEND_LOCK(stcb);
12214                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12215                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12216                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12217                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12218                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12219                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12220                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12221                         stcb->asoc.strmout[i].sid = i;
12222                         stcb->asoc.strmout[i].state = oldstream[i].state;
12223                         /* FIX ME FIX ME */
12224                         /*
12225                          * This should be a SS_COPY operation FIX ME STREAM
12226                          * SCHEDULER EXPERT
12227                          */
12228                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12229                         /* now anything on those queues? */
12230                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12231                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12232                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12233                         }
12234
12235                 }
12236                 /* now the new streams */
12237                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12238                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12239                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12240                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12241 #if defined(SCTP_DETAILED_STR_STATS)
12242                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12243                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12244                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12245                         }
12246 #else
12247                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12248                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12249 #endif
12250                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12251                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12252                         stcb->asoc.strmout[i].sid = i;
12253                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12254                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12255                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12256                 }
12257                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12258                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12259                 SCTP_TCB_SEND_UNLOCK(stcb);
12260         }
12261 skip_stuff:
12262         if ((add_stream & 1) && (adding_o > 0)) {
12263                 asoc->strm_pending_add_size = adding_o;
12264                 asoc->peer_req_out = peer_asked;
12265                 sctp_add_an_out_stream(chk, seq, adding_o);
12266                 seq++;
12267                 asoc->stream_reset_outstanding++;
12268         }
12269         if ((add_stream & 2) && (adding_i > 0)) {
12270                 sctp_add_an_in_stream(chk, seq, adding_i);
12271                 seq++;
12272                 asoc->stream_reset_outstanding++;
12273         }
12274         if (send_in_req) {
12275                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12276                 seq++;
12277                 asoc->stream_reset_outstanding++;
12278         }
12279         if (send_tsn_req) {
12280                 sctp_add_stream_reset_tsn(chk, seq);
12281                 asoc->stream_reset_outstanding++;
12282         }
12283         asoc->str_reset = chk;
12284         /* insert the chunk for sending */
12285         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12286             chk,
12287             sctp_next);
12288         asoc->ctrl_queue_cnt++;
12289         if (stcb->asoc.send_sack) {
12290                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12291         }
12292         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12293         return (0);
12294 }
12295
12296 void
12297 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12298     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12299     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12300     uint32_t vrf_id, uint16_t port)
12301 {
12302         /* Don't respond to an ABORT with an ABORT. */
12303         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12304                 if (cause)
12305                         sctp_m_freem(cause);
12306                 return;
12307         }
12308         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12309             mflowtype, mflowid, fibnum,
12310             vrf_id, port);
12311         return;
12312 }
12313
12314 void
12315 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12316     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12317     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12318     uint32_t vrf_id, uint16_t port)
12319 {
12320         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12321             mflowtype, mflowid, fibnum,
12322             vrf_id, port);
12323         return;
12324 }
12325
12326 static struct mbuf *
12327 sctp_copy_resume(struct uio *uio,
12328     int max_send_len,
12329     int user_marks_eor,
12330     int *error,
12331     uint32_t *sndout,
12332     struct mbuf **new_tail)
12333 {
12334         struct mbuf *m;
12335
12336         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12337             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12338         if (m == NULL) {
12339                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12340                 *error = ENOBUFS;
12341         } else {
12342                 *sndout = m_length(m, NULL);
12343                 *new_tail = m_last(m);
12344         }
12345         return (m);
12346 }
12347
12348 static int
12349 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12350     struct uio *uio,
12351     int resv_upfront)
12352 {
12353         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12354             resv_upfront, 0);
12355         if (sp->data == NULL) {
12356                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12357                 return (ENOBUFS);
12358         }
12359         sp->tail_mbuf = m_last(sp->data);
12360         return (0);
12361 }
12362
12363
12364
12365 static struct sctp_stream_queue_pending *
12366 sctp_copy_it_in(struct sctp_tcb *stcb,
12367     struct sctp_association *asoc,
12368     struct sctp_sndrcvinfo *srcv,
12369     struct uio *uio,
12370     struct sctp_nets *net,
12371     int max_send_len,
12372     int user_marks_eor,
12373     int *error)
12374 {
12375         /*-
12376          * This routine must be very careful in its work. Protocol
12377          * processing is up and running so care must be taken to spl...()
12378          * when you need to do something that may effect the stcb/asoc. The
12379          * sb is locked however. When data is copied the protocol processing
12380          * should be enabled since this is a slower operation...
12381          */
12382         struct sctp_stream_queue_pending *sp = NULL;
12383         int resv_in_first;
12384
12385         *error = 0;
12386         /* Now can we send this? */
12387         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12388             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12389             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12390             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12391                 /* got data while shutting down */
12392                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12393                 *error = ECONNRESET;
12394                 goto out_now;
12395         }
12396         sctp_alloc_a_strmoq(stcb, sp);
12397         if (sp == NULL) {
12398                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12399                 *error = ENOMEM;
12400                 goto out_now;
12401         }
12402         sp->act_flags = 0;
12403         sp->sender_all_done = 0;
12404         sp->sinfo_flags = srcv->sinfo_flags;
12405         sp->timetolive = srcv->sinfo_timetolive;
12406         sp->ppid = srcv->sinfo_ppid;
12407         sp->context = srcv->sinfo_context;
12408         sp->fsn = 0;
12409         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12410
12411         sp->sid = srcv->sinfo_stream;
12412         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12413         if ((sp->length == (uint32_t)uio->uio_resid) &&
12414             ((user_marks_eor == 0) ||
12415             (srcv->sinfo_flags & SCTP_EOF) ||
12416             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12417                 sp->msg_is_complete = 1;
12418         } else {
12419                 sp->msg_is_complete = 0;
12420         }
12421         sp->sender_all_done = 0;
12422         sp->some_taken = 0;
12423         sp->put_last_out = 0;
12424         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12425         sp->data = sp->tail_mbuf = NULL;
12426         if (sp->length == 0) {
12427                 goto skip_copy;
12428         }
12429         if (srcv->sinfo_keynumber_valid) {
12430                 sp->auth_keyid = srcv->sinfo_keynumber;
12431         } else {
12432                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12433         }
12434         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12435                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12436                 sp->holds_key_ref = 1;
12437         }
12438         *error = sctp_copy_one(sp, uio, resv_in_first);
12439 skip_copy:
12440         if (*error) {
12441                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12442                 sp = NULL;
12443         } else {
12444                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12445                         sp->net = net;
12446                         atomic_add_int(&sp->net->ref_count, 1);
12447                 } else {
12448                         sp->net = NULL;
12449                 }
12450                 sctp_set_prsctp_policy(sp);
12451         }
12452 out_now:
12453         return (sp);
12454 }
12455
12456
12457 int
12458 sctp_sosend(struct socket *so,
12459     struct sockaddr *addr,
12460     struct uio *uio,
12461     struct mbuf *top,
12462     struct mbuf *control,
12463     int flags,
12464     struct thread *p
12465 )
12466 {
12467         int error, use_sndinfo = 0;
12468         struct sctp_sndrcvinfo sndrcvninfo;
12469         struct sockaddr *addr_to_use;
12470 #if defined(INET) && defined(INET6)
12471         struct sockaddr_in sin;
12472 #endif
12473
12474         if (control) {
12475                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12476                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12477                     sizeof(sndrcvninfo))) {
12478                         /* got one */
12479                         use_sndinfo = 1;
12480                 }
12481         }
12482         addr_to_use = addr;
12483 #if defined(INET) && defined(INET6)
12484         if ((addr) && (addr->sa_family == AF_INET6)) {
12485                 struct sockaddr_in6 *sin6;
12486
12487                 sin6 = (struct sockaddr_in6 *)addr;
12488                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12489                         in6_sin6_2_sin(&sin, sin6);
12490                         addr_to_use = (struct sockaddr *)&sin;
12491                 }
12492         }
12493 #endif
12494         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12495             control,
12496             flags,
12497             use_sndinfo ? &sndrcvninfo : NULL
12498             ,p
12499             );
12500         return (error);
12501 }
12502
12503
12504 int
12505 sctp_lower_sosend(struct socket *so,
12506     struct sockaddr *addr,
12507     struct uio *uio,
12508     struct mbuf *i_pak,
12509     struct mbuf *control,
12510     int flags,
12511     struct sctp_sndrcvinfo *srcv
12512     ,
12513     struct thread *p
12514 )
12515 {
12516         unsigned int sndlen = 0, max_len;
12517         int error, len;
12518         struct mbuf *top = NULL;
12519         int queue_only = 0, queue_only_for_init = 0;
12520         int free_cnt_applied = 0;
12521         int un_sent;
12522         int now_filled = 0;
12523         unsigned int inqueue_bytes = 0;
12524         struct sctp_block_entry be;
12525         struct sctp_inpcb *inp;
12526         struct sctp_tcb *stcb = NULL;
12527         struct timeval now;
12528         struct sctp_nets *net;
12529         struct sctp_association *asoc;
12530         struct sctp_inpcb *t_inp;
12531         int user_marks_eor;
12532         int create_lock_applied = 0;
12533         int nagle_applies = 0;
12534         int some_on_control = 0;
12535         int got_all_of_the_send = 0;
12536         int hold_tcblock = 0;
12537         int non_blocking = 0;
12538         uint32_t local_add_more, local_soresv = 0;
12539         uint16_t port;
12540         uint16_t sinfo_flags;
12541         sctp_assoc_t sinfo_assoc_id;
12542
12543         error = 0;
12544         net = NULL;
12545         stcb = NULL;
12546         asoc = NULL;
12547
12548         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12549         if (inp == NULL) {
12550                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12551                 error = EINVAL;
12552                 if (i_pak) {
12553                         SCTP_RELEASE_PKT(i_pak);
12554                 }
12555                 return (error);
12556         }
12557         if ((uio == NULL) && (i_pak == NULL)) {
12558                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12559                 return (EINVAL);
12560         }
12561         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12562         atomic_add_int(&inp->total_sends, 1);
12563         if (uio) {
12564                 if (uio->uio_resid < 0) {
12565                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12566                         return (EINVAL);
12567                 }
12568                 sndlen = (unsigned int)uio->uio_resid;
12569         } else {
12570                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12571                 sndlen = SCTP_HEADER_LEN(i_pak);
12572         }
12573         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12574             (void *)addr,
12575             sndlen);
12576         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12577             SCTP_IS_LISTENING(inp)) {
12578                 /* The listener can NOT send */
12579                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12580                 error = ENOTCONN;
12581                 goto out_unlocked;
12582         }
12583         /**
12584          * Pre-screen address, if one is given the sin-len
12585          * must be set correctly!
12586          */
12587         if (addr) {
12588                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12589
12590                 switch (raddr->sa.sa_family) {
12591 #ifdef INET
12592                 case AF_INET:
12593                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12594                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12595                                 error = EINVAL;
12596                                 goto out_unlocked;
12597                         }
12598                         port = raddr->sin.sin_port;
12599                         break;
12600 #endif
12601 #ifdef INET6
12602                 case AF_INET6:
12603                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12604                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12605                                 error = EINVAL;
12606                                 goto out_unlocked;
12607                         }
12608                         port = raddr->sin6.sin6_port;
12609                         break;
12610 #endif
12611                 default:
12612                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12613                         error = EAFNOSUPPORT;
12614                         goto out_unlocked;
12615                 }
12616         } else
12617                 port = 0;
12618
12619         if (srcv) {
12620                 sinfo_flags = srcv->sinfo_flags;
12621                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12622                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12623                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12624                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12625                         error = EINVAL;
12626                         goto out_unlocked;
12627                 }
12628                 if (srcv->sinfo_flags)
12629                         SCTP_STAT_INCR(sctps_sends_with_flags);
12630         } else {
12631                 sinfo_flags = inp->def_send.sinfo_flags;
12632                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12633         }
12634         if (sinfo_flags & SCTP_SENDALL) {
12635                 /* its a sendall */
12636                 error = sctp_sendall(inp, uio, top, srcv);
12637                 top = NULL;
12638                 goto out_unlocked;
12639         }
12640         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12641                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12642                 error = EINVAL;
12643                 goto out_unlocked;
12644         }
12645         /* now we must find the assoc */
12646         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12647             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12648                 SCTP_INP_RLOCK(inp);
12649                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12650                 if (stcb) {
12651                         SCTP_TCB_LOCK(stcb);
12652                         hold_tcblock = 1;
12653                 }
12654                 SCTP_INP_RUNLOCK(inp);
12655         } else if (sinfo_assoc_id) {
12656                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12657                 if (stcb != NULL) {
12658                         hold_tcblock = 1;
12659                 }
12660         } else if (addr) {
12661                 /*-
12662                  * Since we did not use findep we must
12663                  * increment it, and if we don't find a tcb
12664                  * decrement it.
12665                  */
12666                 SCTP_INP_WLOCK(inp);
12667                 SCTP_INP_INCR_REF(inp);
12668                 SCTP_INP_WUNLOCK(inp);
12669                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12670                 if (stcb == NULL) {
12671                         SCTP_INP_WLOCK(inp);
12672                         SCTP_INP_DECR_REF(inp);
12673                         SCTP_INP_WUNLOCK(inp);
12674                 } else {
12675                         hold_tcblock = 1;
12676                 }
12677         }
12678         if ((stcb == NULL) && (addr)) {
12679                 /* Possible implicit send? */
12680                 SCTP_ASOC_CREATE_LOCK(inp);
12681                 create_lock_applied = 1;
12682                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12683                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12684                         /* Should I really unlock ? */
12685                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12686                         error = EINVAL;
12687                         goto out_unlocked;
12688
12689                 }
12690                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12691                     (addr->sa_family == AF_INET6)) {
12692                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12693                         error = EINVAL;
12694                         goto out_unlocked;
12695                 }
12696                 SCTP_INP_WLOCK(inp);
12697                 SCTP_INP_INCR_REF(inp);
12698                 SCTP_INP_WUNLOCK(inp);
12699                 /* With the lock applied look again */
12700                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12701                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12702                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12703                 }
12704                 if (stcb == NULL) {
12705                         SCTP_INP_WLOCK(inp);
12706                         SCTP_INP_DECR_REF(inp);
12707                         SCTP_INP_WUNLOCK(inp);
12708                 } else {
12709                         hold_tcblock = 1;
12710                 }
12711                 if (error) {
12712                         goto out_unlocked;
12713                 }
12714                 if (t_inp != inp) {
12715                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12716                         error = ENOTCONN;
12717                         goto out_unlocked;
12718                 }
12719         }
12720         if (stcb == NULL) {
12721                 if (addr == NULL) {
12722                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12723                         error = ENOENT;
12724                         goto out_unlocked;
12725                 } else {
12726                         /* We must go ahead and start the INIT process */
12727                         uint32_t vrf_id;
12728
12729                         if ((sinfo_flags & SCTP_ABORT) ||
12730                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12731                                 /*-
12732                                  * User asks to abort a non-existant assoc,
12733                                  * or EOF a non-existant assoc with no data
12734                                  */
12735                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12736                                 error = ENOENT;
12737                                 goto out_unlocked;
12738                         }
12739                         /* get an asoc/stcb struct */
12740                         vrf_id = inp->def_vrf_id;
12741 #ifdef INVARIANTS
12742                         if (create_lock_applied == 0) {
12743                                 panic("Error, should hold create lock and I don't?");
12744                         }
12745 #endif
12746                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12747                             inp->sctp_ep.pre_open_stream_count,
12748                             inp->sctp_ep.port,
12749                             p);
12750                         if (stcb == NULL) {
12751                                 /* Error is setup for us in the call */
12752                                 goto out_unlocked;
12753                         }
12754                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12755                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12756                                 /*
12757                                  * Set the connected flag so we can queue
12758                                  * data
12759                                  */
12760                                 soisconnecting(so);
12761                         }
12762                         hold_tcblock = 1;
12763                         if (create_lock_applied) {
12764                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12765                                 create_lock_applied = 0;
12766                         } else {
12767                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12768                         }
12769                         /*
12770                          * Turn on queue only flag to prevent data from
12771                          * being sent
12772                          */
12773                         queue_only = 1;
12774                         asoc = &stcb->asoc;
12775                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12776                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12777
12778                         /* initialize authentication params for the assoc */
12779                         sctp_initialize_auth_params(inp, stcb);
12780
12781                         if (control) {
12782                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12783                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12784                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12785                                         hold_tcblock = 0;
12786                                         stcb = NULL;
12787                                         goto out_unlocked;
12788                                 }
12789                         }
12790                         /* out with the INIT */
12791                         queue_only_for_init = 1;
12792                         /*-
12793                          * we may want to dig in after this call and adjust the MTU
12794                          * value. It defaulted to 1500 (constant) but the ro
12795                          * structure may now have an update and thus we may need to
12796                          * change it BEFORE we append the message.
12797                          */
12798                 }
12799         } else
12800                 asoc = &stcb->asoc;
12801         if (srcv == NULL)
12802                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12803         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12804                 if (addr)
12805                         net = sctp_findnet(stcb, addr);
12806                 else
12807                         net = NULL;
12808                 if ((net == NULL) ||
12809                     ((port != 0) && (port != stcb->rport))) {
12810                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12811                         error = EINVAL;
12812                         goto out_unlocked;
12813                 }
12814         } else {
12815                 if (stcb->asoc.alternate) {
12816                         net = stcb->asoc.alternate;
12817                 } else {
12818                         net = stcb->asoc.primary_destination;
12819                 }
12820         }
12821         atomic_add_int(&stcb->total_sends, 1);
12822         /* Keep the stcb from being freed under our feet */
12823         atomic_add_int(&asoc->refcnt, 1);
12824         free_cnt_applied = 1;
12825
12826         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12827                 if (sndlen > asoc->smallest_mtu) {
12828                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12829                         error = EMSGSIZE;
12830                         goto out_unlocked;
12831                 }
12832         }
12833         if (SCTP_SO_IS_NBIO(so)
12834             || (flags & MSG_NBIO)
12835             ) {
12836                 non_blocking = 1;
12837         }
12838         /* would we block? */
12839         if (non_blocking) {
12840                 uint32_t amount;
12841
12842                 if (hold_tcblock == 0) {
12843                         SCTP_TCB_LOCK(stcb);
12844                         hold_tcblock = 1;
12845                 }
12846                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12847                 if (user_marks_eor == 0) {
12848                         amount = sndlen;
12849                 } else {
12850                         amount = 1;
12851                 }
12852                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12853                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12854                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12855                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12856                                 error = EMSGSIZE;
12857                         else
12858                                 error = EWOULDBLOCK;
12859                         goto out_unlocked;
12860                 }
12861                 stcb->asoc.sb_send_resv += sndlen;
12862                 SCTP_TCB_UNLOCK(stcb);
12863                 hold_tcblock = 0;
12864         } else {
12865                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12866         }
12867         local_soresv = sndlen;
12868         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12869                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12870                 error = ECONNRESET;
12871                 goto out_unlocked;
12872         }
12873         if (create_lock_applied) {
12874                 SCTP_ASOC_CREATE_UNLOCK(inp);
12875                 create_lock_applied = 0;
12876         }
12877         /* Is the stream no. valid? */
12878         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12879                 /* Invalid stream number */
12880                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12881                 error = EINVAL;
12882                 goto out_unlocked;
12883         }
12884         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12885             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12886                 /*
12887                  * Can't queue any data while stream reset is underway.
12888                  */
12889                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12890                         error = EAGAIN;
12891                 } else {
12892                         error = EINVAL;
12893                 }
12894                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12895                 goto out_unlocked;
12896         }
12897         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12898             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12899                 queue_only = 1;
12900         }
12901         /* we are now done with all control */
12902         if (control) {
12903                 sctp_m_freem(control);
12904                 control = NULL;
12905         }
12906         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12907             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12908             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12909             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12910                 if (srcv->sinfo_flags & SCTP_ABORT) {
12911                         ;
12912                 } else {
12913                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12914                         error = ECONNRESET;
12915                         goto out_unlocked;
12916                 }
12917         }
12918         /* Ok, we will attempt a msgsnd :> */
12919         if (p) {
12920                 p->td_ru.ru_msgsnd++;
12921         }
12922         /* Are we aborting? */
12923         if (srcv->sinfo_flags & SCTP_ABORT) {
12924                 struct mbuf *mm;
12925                 int tot_demand, tot_out = 0, max_out;
12926
12927                 SCTP_STAT_INCR(sctps_sends_with_abort);
12928                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12929                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12930                         /* It has to be up before we abort */
12931                         /* how big is the user initiated abort? */
12932                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12933                         error = EINVAL;
12934                         goto out;
12935                 }
12936                 if (hold_tcblock) {
12937                         SCTP_TCB_UNLOCK(stcb);
12938                         hold_tcblock = 0;
12939                 }
12940                 if (top) {
12941                         struct mbuf *cntm = NULL;
12942
12943                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12944                         if (sndlen != 0) {
12945                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12946                                         tot_out += SCTP_BUF_LEN(cntm);
12947                                 }
12948                         }
12949                 } else {
12950                         /* Must fit in a MTU */
12951                         tot_out = sndlen;
12952                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12953                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12954                                 /* To big */
12955                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12956                                 error = EMSGSIZE;
12957                                 goto out;
12958                         }
12959                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12960                 }
12961                 if (mm == NULL) {
12962                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12963                         error = ENOMEM;
12964                         goto out;
12965                 }
12966                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12967                 max_out -= sizeof(struct sctp_abort_msg);
12968                 if (tot_out > max_out) {
12969                         tot_out = max_out;
12970                 }
12971                 if (mm) {
12972                         struct sctp_paramhdr *ph;
12973
12974                         /* now move forward the data pointer */
12975                         ph = mtod(mm, struct sctp_paramhdr *);
12976                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12977                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12978                         ph++;
12979                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12980                         if (top == NULL) {
12981                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12982                                 if (error) {
12983                                         /*-
12984                                          * Here if we can't get his data we
12985                                          * still abort we just don't get to
12986                                          * send the users note :-0
12987                                          */
12988                                         sctp_m_freem(mm);
12989                                         mm = NULL;
12990                                 }
12991                         } else {
12992                                 if (sndlen != 0) {
12993                                         SCTP_BUF_NEXT(mm) = top;
12994                                 }
12995                         }
12996                 }
12997                 if (hold_tcblock == 0) {
12998                         SCTP_TCB_LOCK(stcb);
12999                 }
13000                 atomic_add_int(&stcb->asoc.refcnt, -1);
13001                 free_cnt_applied = 0;
13002                 /* release this lock, otherwise we hang on ourselves */
13003                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13004                 /* now relock the stcb so everything is sane */
13005                 hold_tcblock = 0;
13006                 stcb = NULL;
13007                 /*
13008                  * In this case top is already chained to mm avoid double
13009                  * free, since we free it below if top != NULL and driver
13010                  * would free it after sending the packet out
13011                  */
13012                 if (sndlen != 0) {
13013                         top = NULL;
13014                 }
13015                 goto out_unlocked;
13016         }
13017         /* Calculate the maximum we can send */
13018         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13019         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13020                 if (non_blocking) {
13021                         /* we already checked for non-blocking above. */
13022                         max_len = sndlen;
13023                 } else {
13024                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13025                 }
13026         } else {
13027                 max_len = 0;
13028         }
13029         if (hold_tcblock) {
13030                 SCTP_TCB_UNLOCK(stcb);
13031                 hold_tcblock = 0;
13032         }
13033         if (asoc->strmout == NULL) {
13034                 /* huh? software error */
13035                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13036                 error = EFAULT;
13037                 goto out_unlocked;
13038         }
13039         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13040         if ((user_marks_eor == 0) &&
13041             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13042                 /* It will NEVER fit */
13043                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13044                 error = EMSGSIZE;
13045                 goto out_unlocked;
13046         }
13047         if ((uio == NULL) && user_marks_eor) {
13048                 /*-
13049                  * We do not support eeor mode for
13050                  * sending with mbuf chains (like sendfile).
13051                  */
13052                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13053                 error = EINVAL;
13054                 goto out_unlocked;
13055         }
13056         if (user_marks_eor) {
13057                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13058         } else {
13059                 /*-
13060                  * For non-eeor the whole message must fit in
13061                  * the socket send buffer.
13062                  */
13063                 local_add_more = sndlen;
13064         }
13065         len = 0;
13066         if (non_blocking) {
13067                 goto skip_preblock;
13068         }
13069         if (((max_len <= local_add_more) &&
13070             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13071             (max_len == 0) ||
13072             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13073                 /* No room right now ! */
13074                 SOCKBUF_LOCK(&so->so_snd);
13075                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13076                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13077                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13078                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13079                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13080                             inqueue_bytes,
13081                             local_add_more,
13082                             stcb->asoc.stream_queue_cnt,
13083                             stcb->asoc.chunks_on_out_queue,
13084                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13085                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13086                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13087                         }
13088                         be.error = 0;
13089                         stcb->block_entry = &be;
13090                         error = sbwait(&so->so_snd);
13091                         stcb->block_entry = NULL;
13092                         if (error || so->so_error || be.error) {
13093                                 if (error == 0) {
13094                                         if (so->so_error)
13095                                                 error = so->so_error;
13096                                         if (be.error) {
13097                                                 error = be.error;
13098                                         }
13099                                 }
13100                                 SOCKBUF_UNLOCK(&so->so_snd);
13101                                 goto out_unlocked;
13102                         }
13103                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13104                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13105                                     asoc, stcb->asoc.total_output_queue_size);
13106                         }
13107                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13108                                 SOCKBUF_UNLOCK(&so->so_snd);
13109                                 goto out_unlocked;
13110                         }
13111                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13112                 }
13113                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13114                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13115                 } else {
13116                         max_len = 0;
13117                 }
13118                 SOCKBUF_UNLOCK(&so->so_snd);
13119         }
13120 skip_preblock:
13121         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13122                 goto out_unlocked;
13123         }
13124         /*
13125          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13126          * case NOTE: uio will be null when top/mbuf is passed
13127          */
13128         if (sndlen == 0) {
13129                 if (srcv->sinfo_flags & SCTP_EOF) {
13130                         got_all_of_the_send = 1;
13131                         goto dataless_eof;
13132                 } else {
13133                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13134                         error = EINVAL;
13135                         goto out;
13136                 }
13137         }
13138         if (top == NULL) {
13139                 struct sctp_stream_queue_pending *sp;
13140                 struct sctp_stream_out *strm;
13141                 uint32_t sndout;
13142
13143                 SCTP_TCB_SEND_LOCK(stcb);
13144                 if ((asoc->stream_locked) &&
13145                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13146                         SCTP_TCB_SEND_UNLOCK(stcb);
13147                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13148                         error = EINVAL;
13149                         goto out;
13150                 }
13151                 SCTP_TCB_SEND_UNLOCK(stcb);
13152
13153                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13154                 if (strm->last_msg_incomplete == 0) {
13155         do_a_copy_in:
13156                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13157                         if (error) {
13158                                 goto out;
13159                         }
13160                         SCTP_TCB_SEND_LOCK(stcb);
13161                         if (sp->msg_is_complete) {
13162                                 strm->last_msg_incomplete = 0;
13163                                 asoc->stream_locked = 0;
13164                         } else {
13165                                 /*
13166                                  * Just got locked to this guy in case of an
13167                                  * interrupt.
13168                                  */
13169                                 strm->last_msg_incomplete = 1;
13170                                 if (stcb->asoc.idata_supported == 0) {
13171                                         asoc->stream_locked = 1;
13172                                         asoc->stream_locked_on = srcv->sinfo_stream;
13173                                 }
13174                                 sp->sender_all_done = 0;
13175                         }
13176                         sctp_snd_sb_alloc(stcb, sp->length);
13177                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13178                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13179                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13180                         }
13181                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13182                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13183                         SCTP_TCB_SEND_UNLOCK(stcb);
13184                 } else {
13185                         SCTP_TCB_SEND_LOCK(stcb);
13186                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13187                         SCTP_TCB_SEND_UNLOCK(stcb);
13188                         if (sp == NULL) {
13189                                 /* ???? Huh ??? last msg is gone */
13190 #ifdef INVARIANTS
13191                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13192 #else
13193                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13194                                 strm->last_msg_incomplete = 0;
13195 #endif
13196                                 goto do_a_copy_in;
13197
13198                         }
13199                 }
13200                 while (uio->uio_resid > 0) {
13201                         /* How much room do we have? */
13202                         struct mbuf *new_tail, *mm;
13203
13204                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13205                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13206                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13207                         else
13208                                 max_len = 0;
13209
13210                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13211                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13212                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13213                                 sndout = 0;
13214                                 new_tail = NULL;
13215                                 if (hold_tcblock) {
13216                                         SCTP_TCB_UNLOCK(stcb);
13217                                         hold_tcblock = 0;
13218                                 }
13219                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13220                                 if ((mm == NULL) || error) {
13221                                         if (mm) {
13222                                                 sctp_m_freem(mm);
13223                                         }
13224                                         goto out;
13225                                 }
13226                                 /* Update the mbuf and count */
13227                                 SCTP_TCB_SEND_LOCK(stcb);
13228                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13229                                         /*
13230                                          * we need to get out. Peer probably
13231                                          * aborted.
13232                                          */
13233                                         sctp_m_freem(mm);
13234                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13235                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13236                                                 error = ECONNRESET;
13237                                         }
13238                                         SCTP_TCB_SEND_UNLOCK(stcb);
13239                                         goto out;
13240                                 }
13241                                 if (sp->tail_mbuf) {
13242                                         /* tack it to the end */
13243                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13244                                         sp->tail_mbuf = new_tail;
13245                                 } else {
13246                                         /* A stolen mbuf */
13247                                         sp->data = mm;
13248                                         sp->tail_mbuf = new_tail;
13249                                 }
13250                                 sctp_snd_sb_alloc(stcb, sndout);
13251                                 atomic_add_int(&sp->length, sndout);
13252                                 len += sndout;
13253                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13254                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13255                                 }
13256                                 /* Did we reach EOR? */
13257                                 if ((uio->uio_resid == 0) &&
13258                                     ((user_marks_eor == 0) ||
13259                                     (srcv->sinfo_flags & SCTP_EOF) ||
13260                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13261                                         sp->msg_is_complete = 1;
13262                                 } else {
13263                                         sp->msg_is_complete = 0;
13264                                 }
13265                                 SCTP_TCB_SEND_UNLOCK(stcb);
13266                         }
13267                         if (uio->uio_resid == 0) {
13268                                 /* got it all? */
13269                                 continue;
13270                         }
13271                         /* PR-SCTP? */
13272                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13273                                 /*
13274                                  * This is ugly but we must assure locking
13275                                  * order
13276                                  */
13277                                 if (hold_tcblock == 0) {
13278                                         SCTP_TCB_LOCK(stcb);
13279                                         hold_tcblock = 1;
13280                                 }
13281                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13282                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13283                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13284                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13285                                 else
13286                                         max_len = 0;
13287                                 if (max_len > 0) {
13288                                         continue;
13289                                 }
13290                                 SCTP_TCB_UNLOCK(stcb);
13291                                 hold_tcblock = 0;
13292                         }
13293                         /* wait for space now */
13294                         if (non_blocking) {
13295                                 /* Non-blocking io in place out */
13296                                 goto skip_out_eof;
13297                         }
13298                         /* What about the INIT, send it maybe */
13299                         if (queue_only_for_init) {
13300                                 if (hold_tcblock == 0) {
13301                                         SCTP_TCB_LOCK(stcb);
13302                                         hold_tcblock = 1;
13303                                 }
13304                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13305                                         /* a collision took us forward? */
13306                                         queue_only = 0;
13307                                 } else {
13308                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13309                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13310                                         queue_only = 1;
13311                                 }
13312                         }
13313                         if ((net->flight_size > net->cwnd) &&
13314                             (asoc->sctp_cmt_on_off == 0)) {
13315                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13316                                 queue_only = 1;
13317                         } else if (asoc->ifp_had_enobuf) {
13318                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13319                                 if (net->flight_size > (2 * net->mtu)) {
13320                                         queue_only = 1;
13321                                 }
13322                                 asoc->ifp_had_enobuf = 0;
13323                         }
13324                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13325                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13326                             (stcb->asoc.total_flight > 0) &&
13327                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13328                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13329
13330                                 /*-
13331                                  * Ok, Nagle is set on and we have data outstanding.
13332                                  * Don't send anything and let SACKs drive out the
13333                                  * data unless we have a "full" segment to send.
13334                                  */
13335                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13336                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13337                                 }
13338                                 SCTP_STAT_INCR(sctps_naglequeued);
13339                                 nagle_applies = 1;
13340                         } else {
13341                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13342                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13343                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13344                                 }
13345                                 SCTP_STAT_INCR(sctps_naglesent);
13346                                 nagle_applies = 0;
13347                         }
13348                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13349
13350                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13351                                     nagle_applies, un_sent);
13352                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13353                                     stcb->asoc.total_flight,
13354                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13355                         }
13356                         if (queue_only_for_init)
13357                                 queue_only_for_init = 0;
13358                         if ((queue_only == 0) && (nagle_applies == 0)) {
13359                                 /*-
13360                                  * need to start chunk output
13361                                  * before blocking.. note that if
13362                                  * a lock is already applied, then
13363                                  * the input via the net is happening
13364                                  * and I don't need to start output :-D
13365                                  */
13366                                 if (hold_tcblock == 0) {
13367                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13368                                                 hold_tcblock = 1;
13369                                                 sctp_chunk_output(inp,
13370                                                     stcb,
13371                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13372                                         }
13373                                 } else {
13374                                         sctp_chunk_output(inp,
13375                                             stcb,
13376                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13377                                 }
13378                                 if (hold_tcblock == 1) {
13379                                         SCTP_TCB_UNLOCK(stcb);
13380                                         hold_tcblock = 0;
13381                                 }
13382                         }
13383                         SOCKBUF_LOCK(&so->so_snd);
13384                         /*-
13385                          * This is a bit strange, but I think it will
13386                          * work. The total_output_queue_size is locked and
13387                          * protected by the TCB_LOCK, which we just released.
13388                          * There is a race that can occur between releasing it
13389                          * above, and me getting the socket lock, where sacks
13390                          * come in but we have not put the SB_WAIT on the
13391                          * so_snd buffer to get the wakeup. After the LOCK
13392                          * is applied the sack_processing will also need to
13393                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13394                          * once we have the socket buffer lock if we recheck the
13395                          * size we KNOW we will get to sleep safely with the
13396                          * wakeup flag in place.
13397                          */
13398                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13399                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13400                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13401                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13402                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13403                                             asoc, (size_t)uio->uio_resid);
13404                                 }
13405                                 be.error = 0;
13406                                 stcb->block_entry = &be;
13407                                 error = sbwait(&so->so_snd);
13408                                 stcb->block_entry = NULL;
13409
13410                                 if (error || so->so_error || be.error) {
13411                                         if (error == 0) {
13412                                                 if (so->so_error)
13413                                                         error = so->so_error;
13414                                                 if (be.error) {
13415                                                         error = be.error;
13416                                                 }
13417                                         }
13418                                         SOCKBUF_UNLOCK(&so->so_snd);
13419                                         goto out_unlocked;
13420                                 }
13421                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13422                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13423                                             asoc, stcb->asoc.total_output_queue_size);
13424                                 }
13425                         }
13426                         SOCKBUF_UNLOCK(&so->so_snd);
13427                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13428                                 goto out_unlocked;
13429                         }
13430                 }
13431                 SCTP_TCB_SEND_LOCK(stcb);
13432                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13433                         SCTP_TCB_SEND_UNLOCK(stcb);
13434                         goto out_unlocked;
13435                 }
13436                 if (sp) {
13437                         if (sp->msg_is_complete == 0) {
13438                                 strm->last_msg_incomplete = 1;
13439                                 if (stcb->asoc.idata_supported == 0) {
13440                                         asoc->stream_locked = 1;
13441                                         asoc->stream_locked_on = srcv->sinfo_stream;
13442                                 }
13443                         } else {
13444                                 sp->sender_all_done = 1;
13445                                 strm->last_msg_incomplete = 0;
13446                                 asoc->stream_locked = 0;
13447                         }
13448                 } else {
13449                         SCTP_PRINTF("Huh no sp TSNH?\n");
13450                         strm->last_msg_incomplete = 0;
13451                         asoc->stream_locked = 0;
13452                 }
13453                 SCTP_TCB_SEND_UNLOCK(stcb);
13454                 if (uio->uio_resid == 0) {
13455                         got_all_of_the_send = 1;
13456                 }
13457         } else {
13458                 /* We send in a 0, since we do NOT have any locks */
13459                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13460                 top = NULL;
13461                 if (srcv->sinfo_flags & SCTP_EOF) {
13462                         /*
13463                          * This should only happen for Panda for the mbuf
13464                          * send case, which does NOT yet support EEOR mode.
13465                          * Thus, we can just set this flag to do the proper
13466                          * EOF handling.
13467                          */
13468                         got_all_of_the_send = 1;
13469                 }
13470         }
13471         if (error) {
13472                 goto out;
13473         }
13474 dataless_eof:
13475         /* EOF thing ? */
13476         if ((srcv->sinfo_flags & SCTP_EOF) &&
13477             (got_all_of_the_send == 1)) {
13478                 SCTP_STAT_INCR(sctps_sends_with_eof);
13479                 error = 0;
13480                 if (hold_tcblock == 0) {
13481                         SCTP_TCB_LOCK(stcb);
13482                         hold_tcblock = 1;
13483                 }
13484                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13485                     TAILQ_EMPTY(&asoc->sent_queue) &&
13486                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13487                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13488                                 goto abort_anyway;
13489                         }
13490                         /* there is nothing queued to send, so I'm done... */
13491                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13492                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13493                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13494                                 struct sctp_nets *netp;
13495
13496                                 /* only send SHUTDOWN the first time through */
13497                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13498                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13499                                 }
13500                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13501                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13502                                 sctp_stop_timers_for_shutdown(stcb);
13503                                 if (stcb->asoc.alternate) {
13504                                         netp = stcb->asoc.alternate;
13505                                 } else {
13506                                         netp = stcb->asoc.primary_destination;
13507                                 }
13508                                 sctp_send_shutdown(stcb, netp);
13509                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13510                                     netp);
13511                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13512                                     asoc->primary_destination);
13513                         }
13514                 } else {
13515                         /*-
13516                          * we still got (or just got) data to send, so set
13517                          * SHUTDOWN_PENDING
13518                          */
13519                         /*-
13520                          * XXX sockets draft says that SCTP_EOF should be
13521                          * sent with no data.  currently, we will allow user
13522                          * data to be sent first and move to
13523                          * SHUTDOWN-PENDING
13524                          */
13525                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13526                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13527                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13528                                 if (hold_tcblock == 0) {
13529                                         SCTP_TCB_LOCK(stcb);
13530                                         hold_tcblock = 1;
13531                                 }
13532                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13533                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13534                                 }
13535                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13536                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13537                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13538                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13539                                         struct mbuf *op_err;
13540                                         char msg[SCTP_DIAG_INFO_LEN];
13541
13542                         abort_anyway:
13543                                         if (free_cnt_applied) {
13544                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13545                                                 free_cnt_applied = 0;
13546                                         }
13547                                         snprintf(msg, sizeof(msg),
13548                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13549                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13550                                             msg);
13551                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13552                                             op_err, SCTP_SO_LOCKED);
13553                                         /*
13554                                          * now relock the stcb so everything
13555                                          * is sane
13556                                          */
13557                                         hold_tcblock = 0;
13558                                         stcb = NULL;
13559                                         goto out;
13560                                 }
13561                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13562                                     asoc->primary_destination);
13563                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13564                         }
13565                 }
13566         }
13567 skip_out_eof:
13568         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13569                 some_on_control = 1;
13570         }
13571         if (queue_only_for_init) {
13572                 if (hold_tcblock == 0) {
13573                         SCTP_TCB_LOCK(stcb);
13574                         hold_tcblock = 1;
13575                 }
13576                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13577                         /* a collision took us forward? */
13578                         queue_only = 0;
13579                 } else {
13580                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13581                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13582                         queue_only = 1;
13583                 }
13584         }
13585         if ((net->flight_size > net->cwnd) &&
13586             (stcb->asoc.sctp_cmt_on_off == 0)) {
13587                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13588                 queue_only = 1;
13589         } else if (asoc->ifp_had_enobuf) {
13590                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13591                 if (net->flight_size > (2 * net->mtu)) {
13592                         queue_only = 1;
13593                 }
13594                 asoc->ifp_had_enobuf = 0;
13595         }
13596         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13597         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13598             (stcb->asoc.total_flight > 0) &&
13599             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13600             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13601                 /*-
13602                  * Ok, Nagle is set on and we have data outstanding.
13603                  * Don't send anything and let SACKs drive out the
13604                  * data unless wen have a "full" segment to send.
13605                  */
13606                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13607                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13608                 }
13609                 SCTP_STAT_INCR(sctps_naglequeued);
13610                 nagle_applies = 1;
13611         } else {
13612                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13613                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13614                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13615                 }
13616                 SCTP_STAT_INCR(sctps_naglesent);
13617                 nagle_applies = 0;
13618         }
13619         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13620                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13621                     nagle_applies, un_sent);
13622                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13623                     stcb->asoc.total_flight,
13624                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13625         }
13626         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13627                 /* we can attempt to send too. */
13628                 if (hold_tcblock == 0) {
13629                         /*
13630                          * If there is activity recv'ing sacks no need to
13631                          * send
13632                          */
13633                         if (SCTP_TCB_TRYLOCK(stcb)) {
13634                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13635                                 hold_tcblock = 1;
13636                         }
13637                 } else {
13638                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13639                 }
13640         } else if ((queue_only == 0) &&
13641                     (stcb->asoc.peers_rwnd == 0) &&
13642             (stcb->asoc.total_flight == 0)) {
13643                 /* We get to have a probe outstanding */
13644                 if (hold_tcblock == 0) {
13645                         hold_tcblock = 1;
13646                         SCTP_TCB_LOCK(stcb);
13647                 }
13648                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13649         } else if (some_on_control) {
13650                 int num_out, reason, frag_point;
13651
13652                 /* Here we do control only */
13653                 if (hold_tcblock == 0) {
13654                         hold_tcblock = 1;
13655                         SCTP_TCB_LOCK(stcb);
13656                 }
13657                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13658                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13659                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13660         }
13661         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13662             queue_only, stcb->asoc.peers_rwnd, un_sent,
13663             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13664             stcb->asoc.total_output_queue_size, error);
13665
13666 out:
13667 out_unlocked:
13668
13669         if (local_soresv && stcb) {
13670                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13671         }
13672         if (create_lock_applied) {
13673                 SCTP_ASOC_CREATE_UNLOCK(inp);
13674         }
13675         if ((stcb) && hold_tcblock) {
13676                 SCTP_TCB_UNLOCK(stcb);
13677         }
13678         if (stcb && free_cnt_applied) {
13679                 atomic_add_int(&stcb->asoc.refcnt, -1);
13680         }
13681 #ifdef INVARIANTS
13682         if (stcb) {
13683                 if (mtx_owned(&stcb->tcb_mtx)) {
13684                         panic("Leaving with tcb mtx owned?");
13685                 }
13686                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13687                         panic("Leaving with tcb send mtx owned?");
13688                 }
13689         }
13690 #endif
13691         if (top) {
13692                 sctp_m_freem(top);
13693         }
13694         if (control) {
13695                 sctp_m_freem(control);
13696         }
13697         return (error);
13698 }
13699
13700
13701 /*
13702  * generate an AUTHentication chunk, if required
13703  */
13704 struct mbuf *
13705 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13706     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13707     struct sctp_tcb *stcb, uint8_t chunk)
13708 {
13709         struct mbuf *m_auth;
13710         struct sctp_auth_chunk *auth;
13711         int chunk_len;
13712         struct mbuf *cn;
13713
13714         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13715             (stcb == NULL))
13716                 return (m);
13717
13718         if (stcb->asoc.auth_supported == 0) {
13719                 return (m);
13720         }
13721         /* does the requested chunk require auth? */
13722         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13723                 return (m);
13724         }
13725         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13726         if (m_auth == NULL) {
13727                 /* no mbuf's */
13728                 return (m);
13729         }
13730         /* reserve some space if this will be the first mbuf */
13731         if (m == NULL)
13732                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13733         /* fill in the AUTH chunk details */
13734         auth = mtod(m_auth, struct sctp_auth_chunk *);
13735         memset(auth, 0, sizeof(*auth));
13736         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13737         auth->ch.chunk_flags = 0;
13738         chunk_len = sizeof(*auth) +
13739             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13740         auth->ch.chunk_length = htons(chunk_len);
13741         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13742         /* key id and hmac digest will be computed and filled in upon send */
13743
13744         /* save the offset where the auth was inserted into the chain */
13745         *offset = 0;
13746         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13747                 *offset += SCTP_BUF_LEN(cn);
13748         }
13749
13750         /* update length and return pointer to the auth chunk */
13751         SCTP_BUF_LEN(m_auth) = chunk_len;
13752         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13753         if (auth_ret != NULL)
13754                 *auth_ret = auth;
13755
13756         return (m);
13757 }
13758
13759 #ifdef INET6
13760 int
13761 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13762 {
13763         struct nd_prefix *pfx = NULL;
13764         struct nd_pfxrouter *pfxrtr = NULL;
13765         struct sockaddr_in6 gw6;
13766
13767         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13768                 return (0);
13769
13770         /* get prefix entry of address */
13771         ND6_RLOCK();
13772         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13773                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13774                         continue;
13775                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13776                     &src6->sin6_addr, &pfx->ndpr_mask))
13777                         break;
13778         }
13779         /* no prefix entry in the prefix list */
13780         if (pfx == NULL) {
13781                 ND6_RUNLOCK();
13782                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13783                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13784                 return (0);
13785         }
13786         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13787         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13788
13789         /* search installed gateway from prefix entry */
13790         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13791                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13792                 gw6.sin6_family = AF_INET6;
13793                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13794                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13795                     sizeof(struct in6_addr));
13796                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13797                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13798                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13799                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13800                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13801                         ND6_RUNLOCK();
13802                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13803                         return (1);
13804                 }
13805         }
13806         ND6_RUNLOCK();
13807         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13808         return (0);
13809 }
13810 #endif
13811
13812 int
13813 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13814 {
13815 #ifdef INET
13816         struct sockaddr_in *sin, *mask;
13817         struct ifaddr *ifa;
13818         struct in_addr srcnetaddr, gwnetaddr;
13819
13820         if (ro == NULL || ro->ro_rt == NULL ||
13821             sifa->address.sa.sa_family != AF_INET) {
13822                 return (0);
13823         }
13824         ifa = (struct ifaddr *)sifa->ifa;
13825         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13826         sin = &sifa->address.sin;
13827         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13828         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13829         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13830         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13831
13832         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13833         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13834         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13835         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13836         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13837         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13838                 return (1);
13839         }
13840 #endif
13841         return (0);
13842 }