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 *parmh;
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                 parmh = (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                 parmh = 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 *)parmh;
1991                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         parmh->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 *)parmh;
2006                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         parmh->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         int tlen, at, found;
3469         struct sctp_sndinfo sndinfo;
3470         struct sctp_prinfo prinfo;
3471         struct sctp_authinfo authinfo;
3472
3473         tlen = SCTP_BUF_LEN(control);
3474         at = 0;
3475         found = 0;
3476         /*
3477          * Independent of how many mbufs, find the c_type inside the control
3478          * structure and copy out the data.
3479          */
3480         while (at < tlen) {
3481                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3482                         /* There is not enough room for one more. */
3483                         return (found);
3484                 }
3485                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3486                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3487                         /* We dont't have a complete CMSG header. */
3488                         return (found);
3489                 }
3490                 if (((int)cmh.cmsg_len + at) > tlen) {
3491                         /* We don't have the complete CMSG. */
3492                         return (found);
3493                 }
3494                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3495                     ((c_type == cmh.cmsg_type) ||
3496                     ((c_type == SCTP_SNDRCV) &&
3497                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3498                     (cmh.cmsg_type == SCTP_PRINFO) ||
3499                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3500                         if (c_type == cmh.cmsg_type) {
3501                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3502                                         return (found);
3503                                 }
3504                                 /* It is exactly what we want. Copy it out. */
3505                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3506                                 return (1);
3507                         } else {
3508                                 struct sctp_sndrcvinfo *sndrcvinfo;
3509
3510                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3511                                 if (found == 0) {
3512                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3513                                                 return (found);
3514                                         }
3515                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3516                                 }
3517                                 switch (cmh.cmsg_type) {
3518                                 case SCTP_SNDINFO:
3519                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3520                                                 return (found);
3521                                         }
3522                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3523                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3524                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3525                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3526                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3527                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3528                                         break;
3529                                 case SCTP_PRINFO:
3530                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3531                                                 return (found);
3532                                         }
3533                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3534                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3535                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3536                                         } else {
3537                                                 sndrcvinfo->sinfo_timetolive = 0;
3538                                         }
3539                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3540                                         break;
3541                                 case SCTP_AUTHINFO:
3542                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3543                                                 return (found);
3544                                         }
3545                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3546                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3547                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3548                                         break;
3549                                 default:
3550                                         return (found);
3551                                 }
3552                                 found = 1;
3553                         }
3554                 }
3555                 at += CMSG_ALIGN(cmh.cmsg_len);
3556         }
3557         return (found);
3558 }
3559
3560 static int
3561 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3562 {
3563         struct cmsghdr cmh;
3564         int tlen, at;
3565         struct sctp_initmsg initmsg;
3566 #ifdef INET
3567         struct sockaddr_in sin;
3568 #endif
3569 #ifdef INET6
3570         struct sockaddr_in6 sin6;
3571 #endif
3572
3573         tlen = SCTP_BUF_LEN(control);
3574         at = 0;
3575         while (at < tlen) {
3576                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3577                         /* There is not enough room for one more. */
3578                         *error = EINVAL;
3579                         return (1);
3580                 }
3581                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3582                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3583                         /* We dont't have a complete CMSG header. */
3584                         *error = EINVAL;
3585                         return (1);
3586                 }
3587                 if (((int)cmh.cmsg_len + at) > tlen) {
3588                         /* We don't have the complete CMSG. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3593                         switch (cmh.cmsg_type) {
3594                         case SCTP_INIT:
3595                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3596                                         *error = EINVAL;
3597                                         return (1);
3598                                 }
3599                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3600                                 if (initmsg.sinit_max_attempts)
3601                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3602                                 if (initmsg.sinit_num_ostreams)
3603                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3604                                 if (initmsg.sinit_max_instreams)
3605                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3606                                 if (initmsg.sinit_max_init_timeo)
3607                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3608                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3609                                         struct sctp_stream_out *tmp_str;
3610                                         unsigned int i;
3611 #if defined(SCTP_DETAILED_STR_STATS)
3612                                         int j;
3613 #endif
3614
3615                                         /* Default is NOT correct */
3616                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3617                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3618                                         SCTP_TCB_UNLOCK(stcb);
3619                                         SCTP_MALLOC(tmp_str,
3620                                             struct sctp_stream_out *,
3621                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3622                                             SCTP_M_STRMO);
3623                                         SCTP_TCB_LOCK(stcb);
3624                                         if (tmp_str != NULL) {
3625                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3626                                                 stcb->asoc.strmout = tmp_str;
3627                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3628                                         } else {
3629                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3630                                         }
3631                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3632                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3633                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3634                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3635                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3636 #if defined(SCTP_DETAILED_STR_STATS)
3637                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3638                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3639                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3640                                                 }
3641 #else
3642                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3643                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3644 #endif
3645                                                 stcb->asoc.strmout[i].sid = i;
3646                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3649                                         }
3650                                 }
3651                                 break;
3652 #ifdef INET
3653                         case SCTP_DSTADDRV4:
3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3655                                         *error = EINVAL;
3656                                         return (1);
3657                                 }
3658                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3659                                 sin.sin_family = AF_INET;
3660                                 sin.sin_len = sizeof(struct sockaddr_in);
3661                                 sin.sin_port = stcb->rport;
3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3663                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3664                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3665                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3670                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3671                                         *error = ENOBUFS;
3672                                         return (1);
3673                                 }
3674                                 break;
3675 #endif
3676 #ifdef INET6
3677                         case SCTP_DSTADDRV6:
3678                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3679                                         *error = EINVAL;
3680                                         return (1);
3681                                 }
3682                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3683                                 sin6.sin6_family = AF_INET6;
3684                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3685                                 sin6.sin6_port = stcb->rport;
3686                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3687                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3688                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3689                                         *error = EINVAL;
3690                                         return (1);
3691                                 }
3692 #ifdef INET
3693                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3694                                         in6_sin6_2_sin(&sin, &sin6);
3695                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3696                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3697                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3698                                                 *error = EINVAL;
3699                                                 return (1);
3700                                         }
3701                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3702                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703                                                 *error = ENOBUFS;
3704                                                 return (1);
3705                                         }
3706                                 } else
3707 #endif
3708                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3709                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710                                         *error = ENOBUFS;
3711                                         return (1);
3712                                 }
3713                                 break;
3714 #endif
3715                         default:
3716                                 break;
3717                         }
3718                 }
3719                 at += CMSG_ALIGN(cmh.cmsg_len);
3720         }
3721         return (0);
3722 }
3723
3724 static struct sctp_tcb *
3725 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3726     uint16_t port,
3727     struct mbuf *control,
3728     struct sctp_nets **net_p,
3729     int *error)
3730 {
3731         struct cmsghdr cmh;
3732         int tlen, at;
3733         struct sctp_tcb *stcb;
3734         struct sockaddr *addr;
3735 #ifdef INET
3736         struct sockaddr_in sin;
3737 #endif
3738 #ifdef INET6
3739         struct sockaddr_in6 sin6;
3740 #endif
3741
3742         tlen = SCTP_BUF_LEN(control);
3743         at = 0;
3744         while (at < tlen) {
3745                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3746                         /* There is not enough room for one more. */
3747                         *error = EINVAL;
3748                         return (NULL);
3749                 }
3750                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3751                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3752                         /* We dont't have a complete CMSG header. */
3753                         *error = EINVAL;
3754                         return (NULL);
3755                 }
3756                 if (((int)cmh.cmsg_len + at) > tlen) {
3757                         /* We don't have the complete CMSG. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3762                         switch (cmh.cmsg_type) {
3763 #ifdef INET
3764                         case SCTP_DSTADDRV4:
3765                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3766                                         *error = EINVAL;
3767                                         return (NULL);
3768                                 }
3769                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3770                                 sin.sin_family = AF_INET;
3771                                 sin.sin_len = sizeof(struct sockaddr_in);
3772                                 sin.sin_port = port;
3773                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3774                                 addr = (struct sockaddr *)&sin;
3775                                 break;
3776 #endif
3777 #ifdef INET6
3778                         case SCTP_DSTADDRV6:
3779                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3780                                         *error = EINVAL;
3781                                         return (NULL);
3782                                 }
3783                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3784                                 sin6.sin6_family = AF_INET6;
3785                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3786                                 sin6.sin6_port = port;
3787                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3788 #ifdef INET
3789                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3790                                         in6_sin6_2_sin(&sin, &sin6);
3791                                         addr = (struct sockaddr *)&sin;
3792                                 } else
3793 #endif
3794                                         addr = (struct sockaddr *)&sin6;
3795                                 break;
3796 #endif
3797                         default:
3798                                 addr = NULL;
3799                                 break;
3800                         }
3801                         if (addr) {
3802                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3803                                 if (stcb != NULL) {
3804                                         return (stcb);
3805                                 }
3806                         }
3807                 }
3808                 at += CMSG_ALIGN(cmh.cmsg_len);
3809         }
3810         return (NULL);
3811 }
3812
3813 static struct mbuf *
3814 sctp_add_cookie(struct mbuf *init, int init_offset,
3815     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3816 {
3817         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3818         struct sctp_state_cookie *stc;
3819         struct sctp_paramhdr *ph;
3820         uint8_t *foo;
3821         int sig_offset;
3822         uint16_t cookie_sz;
3823
3824         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3825             sizeof(struct sctp_paramhdr)), 0,
3826             M_NOWAIT, 1, MT_DATA);
3827         if (mret == NULL) {
3828                 return (NULL);
3829         }
3830         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3831         if (copy_init == NULL) {
3832                 sctp_m_freem(mret);
3833                 return (NULL);
3834         }
3835 #ifdef SCTP_MBUF_LOGGING
3836         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3837                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3838         }
3839 #endif
3840         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3841             M_NOWAIT);
3842         if (copy_initack == NULL) {
3843                 sctp_m_freem(mret);
3844                 sctp_m_freem(copy_init);
3845                 return (NULL);
3846         }
3847 #ifdef SCTP_MBUF_LOGGING
3848         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3850         }
3851 #endif
3852         /* easy side we just drop it on the end */
3853         ph = mtod(mret, struct sctp_paramhdr *);
3854         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3855             sizeof(struct sctp_paramhdr);
3856         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3857             sizeof(struct sctp_paramhdr));
3858         ph->param_type = htons(SCTP_STATE_COOKIE);
3859         ph->param_length = 0;   /* fill in at the end */
3860         /* Fill in the stc cookie data */
3861         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3862
3863         /* tack the INIT and then the INIT-ACK onto the chain */
3864         cookie_sz = 0;
3865         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3866                 cookie_sz += SCTP_BUF_LEN(m_at);
3867                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3868                         SCTP_BUF_NEXT(m_at) = copy_init;
3869                         break;
3870                 }
3871         }
3872         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3873                 cookie_sz += SCTP_BUF_LEN(m_at);
3874                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3875                         SCTP_BUF_NEXT(m_at) = copy_initack;
3876                         break;
3877                 }
3878         }
3879         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880                 cookie_sz += SCTP_BUF_LEN(m_at);
3881                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3882                         break;
3883                 }
3884         }
3885         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3886         if (sig == NULL) {
3887                 /* no space, so free the entire chain */
3888                 sctp_m_freem(mret);
3889                 return (NULL);
3890         }
3891         SCTP_BUF_LEN(sig) = 0;
3892         SCTP_BUF_NEXT(m_at) = sig;
3893         sig_offset = 0;
3894         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3895         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3896         *signature = foo;
3897         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3898         cookie_sz += SCTP_SIGNATURE_SIZE;
3899         ph->param_length = htons(cookie_sz);
3900         return (mret);
3901 }
3902
3903
3904 static uint8_t
3905 sctp_get_ect(struct sctp_tcb *stcb)
3906 {
3907         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3908                 return (SCTP_ECT0_BIT);
3909         } else {
3910                 return (0);
3911         }
3912 }
3913
3914 #if defined(INET) || defined(INET6)
3915 static void
3916 sctp_handle_no_route(struct sctp_tcb *stcb,
3917     struct sctp_nets *net,
3918     int so_locked)
3919 {
3920         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3921
3922         if (net) {
3923                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3924                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3925                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3926                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3927                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3928                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3929                                     stcb, 0,
3930                                     (void *)net,
3931                                     so_locked);
3932                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3933                                 net->dest_state &= ~SCTP_ADDR_PF;
3934                         }
3935                 }
3936                 if (stcb) {
3937                         if (net == stcb->asoc.primary_destination) {
3938                                 /* need a new primary */
3939                                 struct sctp_nets *alt;
3940
3941                                 alt = sctp_find_alternate_net(stcb, net, 0);
3942                                 if (alt != net) {
3943                                         if (stcb->asoc.alternate) {
3944                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3945                                         }
3946                                         stcb->asoc.alternate = alt;
3947                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3948                                         if (net->ro._s_addr) {
3949                                                 sctp_free_ifa(net->ro._s_addr);
3950                                                 net->ro._s_addr = NULL;
3951                                         }
3952                                         net->src_addr_selected = 0;
3953                                 }
3954                         }
3955                 }
3956         }
3957 }
3958 #endif
3959
3960 static int
3961 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3962     struct sctp_tcb *stcb,      /* may be NULL */
3963     struct sctp_nets *net,
3964     struct sockaddr *to,
3965     struct mbuf *m,
3966     uint32_t auth_offset,
3967     struct sctp_auth_chunk *auth,
3968     uint16_t auth_keyid,
3969     int nofragment_flag,
3970     int ecn_ok,
3971     int out_of_asoc_ok,
3972     uint16_t src_port,
3973     uint16_t dest_port,
3974     uint32_t v_tag,
3975     uint16_t port,
3976     union sctp_sockstore *over_addr,
3977     uint8_t mflowtype, uint32_t mflowid,
3978 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3979     int so_locked SCTP_UNUSED
3980 #else
3981     int so_locked
3982 #endif
3983 )
3984 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3985 {
3986         /**
3987          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3988          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3989          * - fill in the HMAC digest of any AUTH chunk in the packet.
3990          * - calculate and fill in the SCTP checksum.
3991          * - prepend an IP address header.
3992          * - if boundall use INADDR_ANY.
3993          * - if boundspecific do source address selection.
3994          * - set fragmentation option for ipV4.
3995          * - On return from IP output, check/adjust mtu size of output
3996          *   interface and smallest_mtu size as well.
3997          */
3998         /* Will need ifdefs around this */
3999         struct mbuf *newm;
4000         struct sctphdr *sctphdr;
4001         int packet_length;
4002         int ret;
4003 #if defined(INET) || defined(INET6)
4004         uint32_t vrf_id;
4005 #endif
4006 #if defined(INET) || defined(INET6)
4007         struct mbuf *o_pak;
4008         sctp_route_t *ro = NULL;
4009         struct udphdr *udp = NULL;
4010 #endif
4011         uint8_t tos_value;
4012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4013         struct socket *so = NULL;
4014 #endif
4015
4016         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4017                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4018                 sctp_m_freem(m);
4019                 return (EFAULT);
4020         }
4021 #if defined(INET) || defined(INET6)
4022         if (stcb) {
4023                 vrf_id = stcb->asoc.vrf_id;
4024         } else {
4025                 vrf_id = inp->def_vrf_id;
4026         }
4027 #endif
4028         /* fill in the HMAC digest for any AUTH chunk in the packet */
4029         if ((auth != NULL) && (stcb != NULL)) {
4030                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4031         }
4032         if (net) {
4033                 tos_value = net->dscp;
4034         } else if (stcb) {
4035                 tos_value = stcb->asoc.default_dscp;
4036         } else {
4037                 tos_value = inp->sctp_ep.default_dscp;
4038         }
4039
4040         switch (to->sa_family) {
4041 #ifdef INET
4042         case AF_INET:
4043                 {
4044                         struct ip *ip = NULL;
4045                         sctp_route_t iproute;
4046                         int len;
4047
4048                         len = SCTP_MIN_V4_OVERHEAD;
4049                         if (port) {
4050                                 len += sizeof(struct udphdr);
4051                         }
4052                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4053                         if (newm == NULL) {
4054                                 sctp_m_freem(m);
4055                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4056                                 return (ENOMEM);
4057                         }
4058                         SCTP_ALIGN_TO_END(newm, len);
4059                         SCTP_BUF_LEN(newm) = len;
4060                         SCTP_BUF_NEXT(newm) = m;
4061                         m = newm;
4062                         if (net != NULL) {
4063                                 m->m_pkthdr.flowid = net->flowid;
4064                                 M_HASHTYPE_SET(m, net->flowtype);
4065                         } else {
4066                                 m->m_pkthdr.flowid = mflowid;
4067                                 M_HASHTYPE_SET(m, mflowtype);
4068                         }
4069                         packet_length = sctp_calculate_len(m);
4070                         ip = mtod(m, struct ip *);
4071                         ip->ip_v = IPVERSION;
4072                         ip->ip_hl = (sizeof(struct ip) >> 2);
4073                         if (tos_value == 0) {
4074                                 /*
4075                                  * This means especially, that it is not set
4076                                  * at the SCTP layer. So use the value from
4077                                  * the IP layer.
4078                                  */
4079                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4080                         }
4081                         tos_value &= 0xfc;
4082                         if (ecn_ok) {
4083                                 tos_value |= sctp_get_ect(stcb);
4084                         }
4085                         if ((nofragment_flag) && (port == 0)) {
4086                                 ip->ip_off = htons(IP_DF);
4087                         } else {
4088                                 ip->ip_off = htons(0);
4089                         }
4090                         /* FreeBSD has a function for ip_id's */
4091                         ip_fillid(ip);
4092
4093                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4094                         ip->ip_len = htons(packet_length);
4095                         ip->ip_tos = tos_value;
4096                         if (port) {
4097                                 ip->ip_p = IPPROTO_UDP;
4098                         } else {
4099                                 ip->ip_p = IPPROTO_SCTP;
4100                         }
4101                         ip->ip_sum = 0;
4102                         if (net == NULL) {
4103                                 ro = &iproute;
4104                                 memset(&iproute, 0, sizeof(iproute));
4105                                 memcpy(&ro->ro_dst, to, to->sa_len);
4106                         } else {
4107                                 ro = (sctp_route_t *)&net->ro;
4108                         }
4109                         /* Now the address selection part */
4110                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4111
4112                         /* call the routine to select the src address */
4113                         if (net && out_of_asoc_ok == 0) {
4114                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4115                                         sctp_free_ifa(net->ro._s_addr);
4116                                         net->ro._s_addr = NULL;
4117                                         net->src_addr_selected = 0;
4118                                         if (ro->ro_rt) {
4119                                                 RTFREE(ro->ro_rt);
4120                                                 ro->ro_rt = NULL;
4121                                         }
4122                                 }
4123                                 if (net->src_addr_selected == 0) {
4124                                         /* Cache the source address */
4125                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4126                                             ro, net, 0,
4127                                             vrf_id);
4128                                         net->src_addr_selected = 1;
4129                                 }
4130                                 if (net->ro._s_addr == NULL) {
4131                                         /* No route to host */
4132                                         net->src_addr_selected = 0;
4133                                         sctp_handle_no_route(stcb, net, so_locked);
4134                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135                                         sctp_m_freem(m);
4136                                         return (EHOSTUNREACH);
4137                                 }
4138                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4139                         } else {
4140                                 if (over_addr == NULL) {
4141                                         struct sctp_ifa *_lsrc;
4142
4143                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4144                                             net,
4145                                             out_of_asoc_ok,
4146                                             vrf_id);
4147                                         if (_lsrc == NULL) {
4148                                                 sctp_handle_no_route(stcb, net, so_locked);
4149                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4150                                                 sctp_m_freem(m);
4151                                                 return (EHOSTUNREACH);
4152                                         }
4153                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4154                                         sctp_free_ifa(_lsrc);
4155                                 } else {
4156                                         ip->ip_src = over_addr->sin.sin_addr;
4157                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4158                                 }
4159                         }
4160                         if (port) {
4161                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4162                                         sctp_handle_no_route(stcb, net, so_locked);
4163                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4164                                         sctp_m_freem(m);
4165                                         return (EHOSTUNREACH);
4166                                 }
4167                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4168                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4169                                 udp->uh_dport = port;
4170                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4171                                 if (V_udp_cksum) {
4172                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4173                                 } else {
4174                                         udp->uh_sum = 0;
4175                                 }
4176                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4177                         } else {
4178                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4179                         }
4180
4181                         sctphdr->src_port = src_port;
4182                         sctphdr->dest_port = dest_port;
4183                         sctphdr->v_tag = v_tag;
4184                         sctphdr->checksum = 0;
4185
4186                         /*
4187                          * If source address selection fails and we find no
4188                          * route then the ip_output should fail as well with
4189                          * a NO_ROUTE_TO_HOST type error. We probably should
4190                          * catch that somewhere and abort the association
4191                          * right away (assuming this is an INIT being sent).
4192                          */
4193                         if (ro->ro_rt == NULL) {
4194                                 /*
4195                                  * src addr selection failed to find a route
4196                                  * (or valid source addr), so we can't get
4197                                  * there from here (yet)!
4198                                  */
4199                                 sctp_handle_no_route(stcb, net, so_locked);
4200                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201                                 sctp_m_freem(m);
4202                                 return (EHOSTUNREACH);
4203                         }
4204                         if (ro != &iproute) {
4205                                 memcpy(&iproute, ro, sizeof(*ro));
4206                         }
4207                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4208                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4209                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4210                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4211                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4212                             (void *)ro->ro_rt);
4213
4214                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4215                                 /* failed to prepend data, give up */
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4217                                 sctp_m_freem(m);
4218                                 return (ENOMEM);
4219                         }
4220                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4221                         if (port) {
4222 #if defined(SCTP_WITH_NO_CSUM)
4223                                 SCTP_STAT_INCR(sctps_sendnocrc);
4224 #else
4225                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4226                                 SCTP_STAT_INCR(sctps_sendswcrc);
4227 #endif
4228                                 if (V_udp_cksum) {
4229                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4230                                 }
4231                         } else {
4232 #if defined(SCTP_WITH_NO_CSUM)
4233                                 SCTP_STAT_INCR(sctps_sendnocrc);
4234 #else
4235                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4236                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4237                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4238 #endif
4239                         }
4240 #ifdef SCTP_PACKET_LOGGING
4241                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4242                                 sctp_packet_log(o_pak);
4243 #endif
4244                         /* send it out.  table id is taken from stcb */
4245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4246                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4247                                 so = SCTP_INP_SO(inp);
4248                                 SCTP_SOCKET_UNLOCK(so, 0);
4249                         }
4250 #endif
4251                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4253                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4254                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4255                                 SCTP_TCB_UNLOCK(stcb);
4256                                 SCTP_SOCKET_LOCK(so, 0);
4257                                 SCTP_TCB_LOCK(stcb);
4258                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4259                         }
4260 #endif
4261                         SCTP_STAT_INCR(sctps_sendpackets);
4262                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4263                         if (ret)
4264                                 SCTP_STAT_INCR(sctps_senderrors);
4265
4266                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4267                         if (net == NULL) {
4268                                 /* free tempy routes */
4269                                 RO_RTFREE(ro);
4270                         } else {
4271                                 /*
4272                                  * PMTU check versus smallest asoc MTU goes
4273                                  * here
4274                                  */
4275                                 if ((ro->ro_rt != NULL) &&
4276                                     (net->ro._s_addr)) {
4277                                         uint32_t mtu;
4278
4279                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4280                                         if (net->port) {
4281                                                 mtu -= sizeof(struct udphdr);
4282                                         }
4283                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4284                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4285                                                 net->mtu = mtu;
4286                                         }
4287                                 } else if (ro->ro_rt == NULL) {
4288                                         /* route was freed */
4289                                         if (net->ro._s_addr &&
4290                                             net->src_addr_selected) {
4291                                                 sctp_free_ifa(net->ro._s_addr);
4292                                                 net->ro._s_addr = NULL;
4293                                         }
4294                                         net->src_addr_selected = 0;
4295                                 }
4296                         }
4297                         return (ret);
4298                 }
4299 #endif
4300 #ifdef INET6
4301         case AF_INET6:
4302                 {
4303                         uint32_t flowlabel, flowinfo;
4304                         struct ip6_hdr *ip6h;
4305                         struct route_in6 ip6route;
4306                         struct ifnet *ifp;
4307                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4308                         int prev_scope = 0;
4309                         struct sockaddr_in6 lsa6_storage;
4310                         int error;
4311                         u_short prev_port = 0;
4312                         int len;
4313
4314                         if (net) {
4315                                 flowlabel = net->flowlabel;
4316                         } else if (stcb) {
4317                                 flowlabel = stcb->asoc.default_flowlabel;
4318                         } else {
4319                                 flowlabel = inp->sctp_ep.default_flowlabel;
4320                         }
4321                         if (flowlabel == 0) {
4322                                 /*
4323                                  * This means especially, that it is not set
4324                                  * at the SCTP layer. So use the value from
4325                                  * the IP layer.
4326                                  */
4327                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4328                         }
4329                         flowlabel &= 0x000fffff;
4330                         len = SCTP_MIN_OVERHEAD;
4331                         if (port) {
4332                                 len += sizeof(struct udphdr);
4333                         }
4334                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4335                         if (newm == NULL) {
4336                                 sctp_m_freem(m);
4337                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4338                                 return (ENOMEM);
4339                         }
4340                         SCTP_ALIGN_TO_END(newm, len);
4341                         SCTP_BUF_LEN(newm) = len;
4342                         SCTP_BUF_NEXT(newm) = m;
4343                         m = newm;
4344                         if (net != NULL) {
4345                                 m->m_pkthdr.flowid = net->flowid;
4346                                 M_HASHTYPE_SET(m, net->flowtype);
4347                         } else {
4348                                 m->m_pkthdr.flowid = mflowid;
4349                                 M_HASHTYPE_SET(m, mflowtype);
4350                         }
4351                         packet_length = sctp_calculate_len(m);
4352
4353                         ip6h = mtod(m, struct ip6_hdr *);
4354                         /* protect *sin6 from overwrite */
4355                         sin6 = (struct sockaddr_in6 *)to;
4356                         tmp = *sin6;
4357                         sin6 = &tmp;
4358
4359                         /* KAME hack: embed scopeid */
4360                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4361                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4362                                 return (EINVAL);
4363                         }
4364                         if (net == NULL) {
4365                                 memset(&ip6route, 0, sizeof(ip6route));
4366                                 ro = (sctp_route_t *)&ip6route;
4367                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4368                         } else {
4369                                 ro = (sctp_route_t *)&net->ro;
4370                         }
4371                         /*
4372                          * We assume here that inp_flow is in host byte
4373                          * order within the TCB!
4374                          */
4375                         if (tos_value == 0) {
4376                                 /*
4377                                  * This means especially, that it is not set
4378                                  * at the SCTP layer. So use the value from
4379                                  * the IP layer.
4380                                  */
4381                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4382                         }
4383                         tos_value &= 0xfc;
4384                         if (ecn_ok) {
4385                                 tos_value |= sctp_get_ect(stcb);
4386                         }
4387                         flowinfo = 0x06;
4388                         flowinfo <<= 8;
4389                         flowinfo |= tos_value;
4390                         flowinfo <<= 20;
4391                         flowinfo |= flowlabel;
4392                         ip6h->ip6_flow = htonl(flowinfo);
4393                         if (port) {
4394                                 ip6h->ip6_nxt = IPPROTO_UDP;
4395                         } else {
4396                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4397                         }
4398                         ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4399                         ip6h->ip6_dst = sin6->sin6_addr;
4400
4401                         /*
4402                          * Add SRC address selection here: we can only reuse
4403                          * to a limited degree the kame src-addr-sel, since
4404                          * we can try their selection but it may not be
4405                          * bound.
4406                          */
4407                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4408                         lsa6_tmp.sin6_family = AF_INET6;
4409                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4410                         lsa6 = &lsa6_tmp;
4411                         if (net && out_of_asoc_ok == 0) {
4412                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4413                                         sctp_free_ifa(net->ro._s_addr);
4414                                         net->ro._s_addr = NULL;
4415                                         net->src_addr_selected = 0;
4416                                         if (ro->ro_rt) {
4417                                                 RTFREE(ro->ro_rt);
4418                                                 ro->ro_rt = NULL;
4419                                         }
4420                                 }
4421                                 if (net->src_addr_selected == 0) {
4422                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4423                                         /* KAME hack: embed scopeid */
4424                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4425                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4426                                                 return (EINVAL);
4427                                         }
4428                                         /* Cache the source address */
4429                                         net->ro._s_addr = sctp_source_address_selection(inp,
4430                                             stcb,
4431                                             ro,
4432                                             net,
4433                                             0,
4434                                             vrf_id);
4435                                         (void)sa6_recoverscope(sin6);
4436                                         net->src_addr_selected = 1;
4437                                 }
4438                                 if (net->ro._s_addr == NULL) {
4439                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4440                                         net->src_addr_selected = 0;
4441                                         sctp_handle_no_route(stcb, net, so_locked);
4442                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4443                                         sctp_m_freem(m);
4444                                         return (EHOSTUNREACH);
4445                                 }
4446                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4447                         } else {
4448                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4449                                 /* KAME hack: embed scopeid */
4450                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4451                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4452                                         return (EINVAL);
4453                                 }
4454                                 if (over_addr == NULL) {
4455                                         struct sctp_ifa *_lsrc;
4456
4457                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4458                                             net,
4459                                             out_of_asoc_ok,
4460                                             vrf_id);
4461                                         if (_lsrc == NULL) {
4462                                                 sctp_handle_no_route(stcb, net, so_locked);
4463                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4464                                                 sctp_m_freem(m);
4465                                                 return (EHOSTUNREACH);
4466                                         }
4467                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4468                                         sctp_free_ifa(_lsrc);
4469                                 } else {
4470                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4471                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4472                                 }
4473                                 (void)sa6_recoverscope(sin6);
4474                         }
4475                         lsa6->sin6_port = inp->sctp_lport;
4476
4477                         if (ro->ro_rt == NULL) {
4478                                 /*
4479                                  * src addr selection failed to find a route
4480                                  * (or valid source addr), so we can't get
4481                                  * there from here!
4482                                  */
4483                                 sctp_handle_no_route(stcb, net, so_locked);
4484                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4485                                 sctp_m_freem(m);
4486                                 return (EHOSTUNREACH);
4487                         }
4488                         /*
4489                          * XXX: sa6 may not have a valid sin6_scope_id in
4490                          * the non-SCOPEDROUTING case.
4491                          */
4492                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4493                         lsa6_storage.sin6_family = AF_INET6;
4494                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4495                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4496                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4497                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4498                                 sctp_m_freem(m);
4499                                 return (error);
4500                         }
4501                         /* XXX */
4502                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4503                         lsa6_storage.sin6_port = inp->sctp_lport;
4504                         lsa6 = &lsa6_storage;
4505                         ip6h->ip6_src = lsa6->sin6_addr;
4506
4507                         if (port) {
4508                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4509                                         sctp_handle_no_route(stcb, net, so_locked);
4510                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4511                                         sctp_m_freem(m);
4512                                         return (EHOSTUNREACH);
4513                                 }
4514                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4515                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4516                                 udp->uh_dport = port;
4517                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4518                                 udp->uh_sum = 0;
4519                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4520                         } else {
4521                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4522                         }
4523
4524                         sctphdr->src_port = src_port;
4525                         sctphdr->dest_port = dest_port;
4526                         sctphdr->v_tag = v_tag;
4527                         sctphdr->checksum = 0;
4528
4529                         /*
4530                          * We set the hop limit now since there is a good
4531                          * chance that our ro pointer is now filled
4532                          */
4533                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4534                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4535
4536 #ifdef SCTP_DEBUG
4537                         /* Copy to be sure something bad is not happening */
4538                         sin6->sin6_addr = ip6h->ip6_dst;
4539                         lsa6->sin6_addr = ip6h->ip6_src;
4540 #endif
4541
4542                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4543                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4544                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4546                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4547                         if (net) {
4548                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4549                                 /*
4550                                  * preserve the port and scope for link
4551                                  * local send
4552                                  */
4553                                 prev_scope = sin6->sin6_scope_id;
4554                                 prev_port = sin6->sin6_port;
4555                         }
4556                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4557                                 /* failed to prepend data, give up */
4558                                 sctp_m_freem(m);
4559                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4560                                 return (ENOMEM);
4561                         }
4562                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4563                         if (port) {
4564 #if defined(SCTP_WITH_NO_CSUM)
4565                                 SCTP_STAT_INCR(sctps_sendnocrc);
4566 #else
4567                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4568                                 SCTP_STAT_INCR(sctps_sendswcrc);
4569 #endif
4570                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4571                                         udp->uh_sum = 0xffff;
4572                                 }
4573                         } else {
4574 #if defined(SCTP_WITH_NO_CSUM)
4575                                 SCTP_STAT_INCR(sctps_sendnocrc);
4576 #else
4577                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4578                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4579                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4580 #endif
4581                         }
4582                         /* send it out. table id is taken from stcb */
4583 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4584                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4585                                 so = SCTP_INP_SO(inp);
4586                                 SCTP_SOCKET_UNLOCK(so, 0);
4587                         }
4588 #endif
4589 #ifdef SCTP_PACKET_LOGGING
4590                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4591                                 sctp_packet_log(o_pak);
4592 #endif
4593                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4595                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4596                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4597                                 SCTP_TCB_UNLOCK(stcb);
4598                                 SCTP_SOCKET_LOCK(so, 0);
4599                                 SCTP_TCB_LOCK(stcb);
4600                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4601                         }
4602 #endif
4603                         if (net) {
4604                                 /* for link local this must be done */
4605                                 sin6->sin6_scope_id = prev_scope;
4606                                 sin6->sin6_port = prev_port;
4607                         }
4608                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4609                         SCTP_STAT_INCR(sctps_sendpackets);
4610                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4611                         if (ret) {
4612                                 SCTP_STAT_INCR(sctps_senderrors);
4613                         }
4614                         if (net == NULL) {
4615                                 /* Now if we had a temp route free it */
4616                                 RO_RTFREE(ro);
4617                         } else {
4618                                 /*
4619                                  * PMTU check versus smallest asoc MTU goes
4620                                  * here
4621                                  */
4622                                 if (ro->ro_rt == NULL) {
4623                                         /* Route was freed */
4624                                         if (net->ro._s_addr &&
4625                                             net->src_addr_selected) {
4626                                                 sctp_free_ifa(net->ro._s_addr);
4627                                                 net->ro._s_addr = NULL;
4628                                         }
4629                                         net->src_addr_selected = 0;
4630                                 }
4631                                 if ((ro->ro_rt != NULL) &&
4632                                     (net->ro._s_addr)) {
4633                                         uint32_t mtu;
4634
4635                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4636                                         if (mtu &&
4637                                             (stcb->asoc.smallest_mtu > mtu)) {
4638                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4639                                                 net->mtu = mtu;
4640                                                 if (net->port) {
4641                                                         net->mtu -= sizeof(struct udphdr);
4642                                                 }
4643                                         }
4644                                 } else if (ifp) {
4645                                         if (ND_IFINFO(ifp)->linkmtu &&
4646                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4647                                                 sctp_mtu_size_reset(inp,
4648                                                     &stcb->asoc,
4649                                                     ND_IFINFO(ifp)->linkmtu);
4650                                         }
4651                                 }
4652                         }
4653                         return (ret);
4654                 }
4655 #endif
4656         default:
4657                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4658                     ((struct sockaddr *)to)->sa_family);
4659                 sctp_m_freem(m);
4660                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4661                 return (EFAULT);
4662         }
4663 }
4664
4665
4666 void
4667 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4668 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4669     SCTP_UNUSED
4670 #endif
4671 )
4672 {
4673         struct mbuf *m, *m_last;
4674         struct sctp_nets *net;
4675         struct sctp_init_chunk *init;
4676         struct sctp_supported_addr_param *sup_addr;
4677         struct sctp_adaptation_layer_indication *ali;
4678         struct sctp_supported_chunk_types_param *pr_supported;
4679         struct sctp_paramhdr *ph;
4680         int cnt_inits_to = 0;
4681         int ret;
4682         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4683
4684         /* INIT's always go to the primary (and usually ONLY address) */
4685         net = stcb->asoc.primary_destination;
4686         if (net == NULL) {
4687                 net = TAILQ_FIRST(&stcb->asoc.nets);
4688                 if (net == NULL) {
4689                         /* TSNH */
4690                         return;
4691                 }
4692                 /* we confirm any address we send an INIT to */
4693                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4694                 (void)sctp_set_primary_addr(stcb, NULL, net);
4695         } else {
4696                 /* we confirm any address we send an INIT to */
4697                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4698         }
4699         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4700 #ifdef INET6
4701         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4702                 /*
4703                  * special hook, if we are sending to link local it will not
4704                  * show up in our private address count.
4705                  */
4706                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4707                         cnt_inits_to = 1;
4708         }
4709 #endif
4710         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4711                 /* This case should not happen */
4712                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4713                 return;
4714         }
4715         /* start the INIT timer */
4716         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4717
4718         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4719         if (m == NULL) {
4720                 /* No memory, INIT timer will re-attempt. */
4721                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4722                 return;
4723         }
4724         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4725         padding_len = 0;
4726         /* Now lets put the chunk header in place */
4727         init = mtod(m, struct sctp_init_chunk *);
4728         /* now the chunk header */
4729         init->ch.chunk_type = SCTP_INITIATION;
4730         init->ch.chunk_flags = 0;
4731         /* fill in later from mbuf we build */
4732         init->ch.chunk_length = 0;
4733         /* place in my tag */
4734         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4735         /* set up some of the credits. */
4736         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4737             SCTP_MINIMAL_RWND));
4738         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4739         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4740         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4741
4742         /* Adaptation layer indication parameter */
4743         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4744                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4745                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4746                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4747                 ali->ph.param_length = htons(parameter_len);
4748                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4749                 chunk_len += parameter_len;
4750         }
4751         /* ECN parameter */
4752         if (stcb->asoc.ecn_supported == 1) {
4753                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4754                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4755                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4756                 ph->param_length = htons(parameter_len);
4757                 chunk_len += parameter_len;
4758         }
4759         /* PR-SCTP supported parameter */
4760         if (stcb->asoc.prsctp_supported == 1) {
4761                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4762                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4763                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4764                 ph->param_length = htons(parameter_len);
4765                 chunk_len += parameter_len;
4766         }
4767         /* Add NAT friendly parameter. */
4768         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4769                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4772                 ph->param_length = htons(parameter_len);
4773                 chunk_len += parameter_len;
4774         }
4775         /* And now tell the peer which extensions we support */
4776         num_ext = 0;
4777         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4778         if (stcb->asoc.prsctp_supported == 1) {
4779                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4780                 if (stcb->asoc.idata_supported) {
4781                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4782                 }
4783         }
4784         if (stcb->asoc.auth_supported == 1) {
4785                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4786         }
4787         if (stcb->asoc.asconf_supported == 1) {
4788                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4789                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4790         }
4791         if (stcb->asoc.reconfig_supported == 1) {
4792                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4793         }
4794         if (stcb->asoc.idata_supported) {
4795                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4796         }
4797         if (stcb->asoc.nrsack_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4799         }
4800         if (stcb->asoc.pktdrop_supported == 1) {
4801                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4802         }
4803         if (num_ext > 0) {
4804                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4805                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4806                 pr_supported->ph.param_length = htons(parameter_len);
4807                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4808                 chunk_len += parameter_len;
4809         }
4810         /* add authentication parameters */
4811         if (stcb->asoc.auth_supported) {
4812                 /* attach RANDOM parameter, if available */
4813                 if (stcb->asoc.authinfo.random != NULL) {
4814                         struct sctp_auth_random *randp;
4815
4816                         if (padding_len > 0) {
4817                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4818                                 chunk_len += padding_len;
4819                                 padding_len = 0;
4820                         }
4821                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4822                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4823                         /* random key already contains the header */
4824                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4825                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4826                         chunk_len += parameter_len;
4827                 }
4828                 /* add HMAC_ALGO parameter */
4829                 if (stcb->asoc.local_hmacs != NULL) {
4830                         struct sctp_auth_hmac_algo *hmacs;
4831
4832                         if (padding_len > 0) {
4833                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4834                                 chunk_len += padding_len;
4835                                 padding_len = 0;
4836                         }
4837                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4838                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4839                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4840                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4841                         hmacs->ph.param_length = htons(parameter_len);
4842                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4843                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4844                         chunk_len += parameter_len;
4845                 }
4846                 /* add CHUNKS parameter */
4847                 if (stcb->asoc.local_auth_chunks != NULL) {
4848                         struct sctp_auth_chunk_list *chunks;
4849
4850                         if (padding_len > 0) {
4851                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4852                                 chunk_len += padding_len;
4853                                 padding_len = 0;
4854                         }
4855                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4856                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4857                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4858                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4859                         chunks->ph.param_length = htons(parameter_len);
4860                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4861                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4862                         chunk_len += parameter_len;
4863                 }
4864         }
4865         /* now any cookie time extensions */
4866         if (stcb->asoc.cookie_preserve_req) {
4867                 struct sctp_cookie_perserve_param *cookie_preserve;
4868
4869                 if (padding_len > 0) {
4870                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871                         chunk_len += padding_len;
4872                         padding_len = 0;
4873                 }
4874                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4875                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4876                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4877                 cookie_preserve->ph.param_length = htons(parameter_len);
4878                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4879                 stcb->asoc.cookie_preserve_req = 0;
4880                 chunk_len += parameter_len;
4881         }
4882         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4883                 uint8_t i;
4884
4885                 if (padding_len > 0) {
4886                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4887                         chunk_len += padding_len;
4888                         padding_len = 0;
4889                 }
4890                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4891                 if (stcb->asoc.scope.ipv4_addr_legal) {
4892                         parameter_len += (uint16_t)sizeof(uint16_t);
4893                 }
4894                 if (stcb->asoc.scope.ipv6_addr_legal) {
4895                         parameter_len += (uint16_t)sizeof(uint16_t);
4896                 }
4897                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4898                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4899                 sup_addr->ph.param_length = htons(parameter_len);
4900                 i = 0;
4901                 if (stcb->asoc.scope.ipv4_addr_legal) {
4902                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4903                 }
4904                 if (stcb->asoc.scope.ipv6_addr_legal) {
4905                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4906                 }
4907                 padding_len = 4 - 2 * i;
4908                 chunk_len += parameter_len;
4909         }
4910         SCTP_BUF_LEN(m) = chunk_len;
4911         /* now the addresses */
4912         /*
4913          * To optimize this we could put the scoping stuff into a structure
4914          * and remove the individual uint8's from the assoc structure. Then
4915          * we could just sifa in the address within the stcb. But for now
4916          * this is a quick hack to get the address stuff teased apart.
4917          */
4918         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4919             m, cnt_inits_to,
4920             &padding_len, &chunk_len);
4921
4922         init->ch.chunk_length = htons(chunk_len);
4923         if (padding_len > 0) {
4924                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4925                         sctp_m_freem(m);
4926                         return;
4927                 }
4928         }
4929         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4930         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4931             (struct sockaddr *)&net->ro._l_addr,
4932             m, 0, NULL, 0, 0, 0, 0,
4933             inp->sctp_lport, stcb->rport, htonl(0),
4934             net->port, NULL,
4935             0, 0,
4936             so_locked);
4937         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4938         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4939         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4940 }
4941
4942 struct mbuf *
4943 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4944     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4945 {
4946         /*
4947          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4948          * being equal to the beginning of the params i.e. (iphlen +
4949          * sizeof(struct sctp_init_msg) parse through the parameters to the
4950          * end of the mbuf verifying that all parameters are known.
4951          *
4952          * For unknown parameters build and return a mbuf with
4953          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4954          * processing this chunk stop, and set *abort_processing to 1.
4955          *
4956          * By having param_offset be pre-set to where parameters begin it is
4957          * hoped that this routine may be reused in the future by new
4958          * features.
4959          */
4960         struct sctp_paramhdr *phdr, params;
4961
4962         struct mbuf *mat, *op_err;
4963         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4964         int at, limit, pad_needed;
4965         uint16_t ptype, plen, padded_size;
4966         int err_at;
4967
4968         *abort_processing = 0;
4969         mat = in_initpkt;
4970         err_at = 0;
4971         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4972         at = param_offset;
4973         op_err = NULL;
4974         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4975         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4976         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4977                 ptype = ntohs(phdr->param_type);
4978                 plen = ntohs(phdr->param_length);
4979                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4980                         /* wacked parameter */
4981                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4982                         goto invalid_size;
4983                 }
4984                 limit -= SCTP_SIZE32(plen);
4985                 /*-
4986                  * All parameters for all chunks that we know/understand are
4987                  * listed here. We process them other places and make
4988                  * appropriate stop actions per the upper bits. However this
4989                  * is the generic routine processor's can call to get back
4990                  * an operr.. to either incorporate (init-ack) or send.
4991                  */
4992                 padded_size = SCTP_SIZE32(plen);
4993                 switch (ptype) {
4994                         /* Param's with variable size */
4995                 case SCTP_HEARTBEAT_INFO:
4996                 case SCTP_STATE_COOKIE:
4997                 case SCTP_UNRECOG_PARAM:
4998                 case SCTP_ERROR_CAUSE_IND:
4999                         /* ok skip fwd */
5000                         at += padded_size;
5001                         break;
5002                         /* Param's with variable size within a range */
5003                 case SCTP_CHUNK_LIST:
5004                 case SCTP_SUPPORTED_CHUNK_EXT:
5005                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5006                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5007                                 goto invalid_size;
5008                         }
5009                         at += padded_size;
5010                         break;
5011                 case SCTP_SUPPORTED_ADDRTYPE:
5012                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5013                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5014                                 goto invalid_size;
5015                         }
5016                         at += padded_size;
5017                         break;
5018                 case SCTP_RANDOM:
5019                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5020                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5021                                 goto invalid_size;
5022                         }
5023                         at += padded_size;
5024                         break;
5025                 case SCTP_SET_PRIM_ADDR:
5026                 case SCTP_DEL_IP_ADDRESS:
5027                 case SCTP_ADD_IP_ADDRESS:
5028                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5029                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5030                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5031                                 goto invalid_size;
5032                         }
5033                         at += padded_size;
5034                         break;
5035                         /* Param's with a fixed size */
5036                 case SCTP_IPV4_ADDRESS:
5037                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5038                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5039                                 goto invalid_size;
5040                         }
5041                         at += padded_size;
5042                         break;
5043                 case SCTP_IPV6_ADDRESS:
5044                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5045                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5046                                 goto invalid_size;
5047                         }
5048                         at += padded_size;
5049                         break;
5050                 case SCTP_COOKIE_PRESERVE:
5051                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5053                                 goto invalid_size;
5054                         }
5055                         at += padded_size;
5056                         break;
5057                 case SCTP_HAS_NAT_SUPPORT:
5058                         *nat_friendly = 1;
5059                         /* fall through */
5060                 case SCTP_PRSCTP_SUPPORTED:
5061                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5062                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5063                                 goto invalid_size;
5064                         }
5065                         at += padded_size;
5066                         break;
5067                 case SCTP_ECN_CAPABLE:
5068                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5069                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5070                                 goto invalid_size;
5071                         }
5072                         at += padded_size;
5073                         break;
5074                 case SCTP_ULP_ADAPTATION:
5075                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5076                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5077                                 goto invalid_size;
5078                         }
5079                         at += padded_size;
5080                         break;
5081                 case SCTP_SUCCESS_REPORT:
5082                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5083                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5084                                 goto invalid_size;
5085                         }
5086                         at += padded_size;
5087                         break;
5088                 case SCTP_HOSTNAME_ADDRESS:
5089                         {
5090                                 /* We can NOT handle HOST NAME addresses!! */
5091                                 int l_len;
5092
5093                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5094                                 *abort_processing = 1;
5095                                 if (op_err == NULL) {
5096                                         /* Ok need to try to get a mbuf */
5097 #ifdef INET6
5098                                         l_len = SCTP_MIN_OVERHEAD;
5099 #else
5100                                         l_len = SCTP_MIN_V4_OVERHEAD;
5101 #endif
5102                                         l_len += sizeof(struct sctp_chunkhdr);
5103                                         l_len += plen;
5104                                         l_len += sizeof(struct sctp_paramhdr);
5105                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5106                                         if (op_err) {
5107                                                 SCTP_BUF_LEN(op_err) = 0;
5108                                                 /*
5109                                                  * pre-reserve space for ip
5110                                                  * and sctp header  and
5111                                                  * chunk hdr
5112                                                  */
5113 #ifdef INET6
5114                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5115 #else
5116                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5117 #endif
5118                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5119                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5120                                         }
5121                                 }
5122                                 if (op_err) {
5123                                         /* If we have space */
5124                                         struct sctp_paramhdr s;
5125
5126                                         if (err_at % 4) {
5127                                                 uint32_t cpthis = 0;
5128
5129                                                 pad_needed = 4 - (err_at % 4);
5130                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5131                                                 err_at += pad_needed;
5132                                         }
5133                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5134                                         s.param_length = htons(sizeof(s) + plen);
5135                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5136                                         err_at += sizeof(s);
5137                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5138                                         if (phdr == NULL) {
5139                                                 sctp_m_freem(op_err);
5140                                                 /*
5141                                                  * we are out of memory but
5142                                                  * we still need to have a
5143                                                  * look at what to do (the
5144                                                  * system is in trouble
5145                                                  * though).
5146                                                  */
5147                                                 return (NULL);
5148                                         }
5149                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5150                                 }
5151                                 return (op_err);
5152                                 break;
5153                         }
5154                 default:
5155                         /*
5156                          * we do not recognize the parameter figure out what
5157                          * we do.
5158                          */
5159                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5160                         if ((ptype & 0x4000) == 0x4000) {
5161                                 /* Report bit is set?? */
5162                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5163                                 if (op_err == NULL) {
5164                                         int l_len;
5165
5166                                         /* Ok need to try to get an mbuf */
5167 #ifdef INET6
5168                                         l_len = SCTP_MIN_OVERHEAD;
5169 #else
5170                                         l_len = SCTP_MIN_V4_OVERHEAD;
5171 #endif
5172                                         l_len += sizeof(struct sctp_chunkhdr);
5173                                         l_len += plen;
5174                                         l_len += sizeof(struct sctp_paramhdr);
5175                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5176                                         if (op_err) {
5177                                                 SCTP_BUF_LEN(op_err) = 0;
5178 #ifdef INET6
5179                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5180 #else
5181                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5182 #endif
5183                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5184                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5185                                         }
5186                                 }
5187                                 if (op_err) {
5188                                         /* If we have space */
5189                                         struct sctp_paramhdr s;
5190
5191                                         if (err_at % 4) {
5192                                                 uint32_t cpthis = 0;
5193
5194                                                 pad_needed = 4 - (err_at % 4);
5195                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5196                                                 err_at += pad_needed;
5197                                         }
5198                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5199                                         s.param_length = htons(sizeof(s) + plen);
5200                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5201                                         err_at += sizeof(s);
5202                                         if (plen > sizeof(tempbuf)) {
5203                                                 plen = sizeof(tempbuf);
5204                                         }
5205                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5206                                         if (phdr == NULL) {
5207                                                 sctp_m_freem(op_err);
5208                                                 /*
5209                                                  * we are out of memory but
5210                                                  * we still need to have a
5211                                                  * look at what to do (the
5212                                                  * system is in trouble
5213                                                  * though).
5214                                                  */
5215                                                 op_err = NULL;
5216                                                 goto more_processing;
5217                                         }
5218                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5219                                         err_at += plen;
5220                                 }
5221                         }
5222         more_processing:
5223                         if ((ptype & 0x8000) == 0x0000) {
5224                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5225                                 return (op_err);
5226                         } else {
5227                                 /* skip this chunk and continue processing */
5228                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5229                                 at += SCTP_SIZE32(plen);
5230                         }
5231                         break;
5232
5233                 }
5234                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5235         }
5236         return (op_err);
5237 invalid_size:
5238         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5239         *abort_processing = 1;
5240         if ((op_err == NULL) && phdr) {
5241                 int l_len;
5242 #ifdef INET6
5243                 l_len = SCTP_MIN_OVERHEAD;
5244 #else
5245                 l_len = SCTP_MIN_V4_OVERHEAD;
5246 #endif
5247                 l_len += sizeof(struct sctp_chunkhdr);
5248                 l_len += (2 * sizeof(struct sctp_paramhdr));
5249                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5250                 if (op_err) {
5251                         SCTP_BUF_LEN(op_err) = 0;
5252 #ifdef INET6
5253                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5254 #else
5255                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5256 #endif
5257                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5258                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5259                 }
5260         }
5261         if ((op_err) && phdr) {
5262                 struct sctp_paramhdr s;
5263
5264                 if (err_at % 4) {
5265                         uint32_t cpthis = 0;
5266
5267                         pad_needed = 4 - (err_at % 4);
5268                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5269                         err_at += pad_needed;
5270                 }
5271                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5272                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5273                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5274                 err_at += sizeof(s);
5275                 /* Only copy back the p-hdr that caused the issue */
5276                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5277         }
5278         return (op_err);
5279 }
5280
5281 static int
5282 sctp_are_there_new_addresses(struct sctp_association *asoc,
5283     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5284 {
5285         /*
5286          * Given a INIT packet, look through the packet to verify that there
5287          * are NO new addresses. As we go through the parameters add reports
5288          * of any un-understood parameters that require an error.  Also we
5289          * must return (1) to drop the packet if we see a un-understood
5290          * parameter that tells us to drop the chunk.
5291          */
5292         struct sockaddr *sa_touse;
5293         struct sockaddr *sa;
5294         struct sctp_paramhdr *phdr, params;
5295         uint16_t ptype, plen;
5296         uint8_t fnd;
5297         struct sctp_nets *net;
5298         int check_src;
5299 #ifdef INET
5300         struct sockaddr_in sin4, *sa4;
5301 #endif
5302 #ifdef INET6
5303         struct sockaddr_in6 sin6, *sa6;
5304 #endif
5305
5306 #ifdef INET
5307         memset(&sin4, 0, sizeof(sin4));
5308         sin4.sin_family = AF_INET;
5309         sin4.sin_len = sizeof(sin4);
5310 #endif
5311 #ifdef INET6
5312         memset(&sin6, 0, sizeof(sin6));
5313         sin6.sin6_family = AF_INET6;
5314         sin6.sin6_len = sizeof(sin6);
5315 #endif
5316         /* First what about the src address of the pkt ? */
5317         check_src = 0;
5318         switch (src->sa_family) {
5319 #ifdef INET
5320         case AF_INET:
5321                 if (asoc->scope.ipv4_addr_legal) {
5322                         check_src = 1;
5323                 }
5324                 break;
5325 #endif
5326 #ifdef INET6
5327         case AF_INET6:
5328                 if (asoc->scope.ipv6_addr_legal) {
5329                         check_src = 1;
5330                 }
5331                 break;
5332 #endif
5333         default:
5334                 /* TSNH */
5335                 break;
5336         }
5337         if (check_src) {
5338                 fnd = 0;
5339                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5340                         sa = (struct sockaddr *)&net->ro._l_addr;
5341                         if (sa->sa_family == src->sa_family) {
5342 #ifdef INET
5343                                 if (sa->sa_family == AF_INET) {
5344                                         struct sockaddr_in *src4;
5345
5346                                         sa4 = (struct sockaddr_in *)sa;
5347                                         src4 = (struct sockaddr_in *)src;
5348                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5349                                                 fnd = 1;
5350                                                 break;
5351                                         }
5352                                 }
5353 #endif
5354 #ifdef INET6
5355                                 if (sa->sa_family == AF_INET6) {
5356                                         struct sockaddr_in6 *src6;
5357
5358                                         sa6 = (struct sockaddr_in6 *)sa;
5359                                         src6 = (struct sockaddr_in6 *)src;
5360                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5361                                                 fnd = 1;
5362                                                 break;
5363                                         }
5364                                 }
5365 #endif
5366                         }
5367                 }
5368                 if (fnd == 0) {
5369                         /* New address added! no need to look further. */
5370                         return (1);
5371                 }
5372         }
5373         /* Ok so far lets munge through the rest of the packet */
5374         offset += sizeof(struct sctp_init_chunk);
5375         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5376         while (phdr) {
5377                 sa_touse = NULL;
5378                 ptype = ntohs(phdr->param_type);
5379                 plen = ntohs(phdr->param_length);
5380                 switch (ptype) {
5381 #ifdef INET
5382                 case SCTP_IPV4_ADDRESS:
5383                         {
5384                                 struct sctp_ipv4addr_param *p4, p4_buf;
5385
5386                                 phdr = sctp_get_next_param(in_initpkt, offset,
5387                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5388                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5389                                     phdr == NULL) {
5390                                         return (1);
5391                                 }
5392                                 if (asoc->scope.ipv4_addr_legal) {
5393                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5394                                         sin4.sin_addr.s_addr = p4->addr;
5395                                         sa_touse = (struct sockaddr *)&sin4;
5396                                 }
5397                                 break;
5398                         }
5399 #endif
5400 #ifdef INET6
5401                 case SCTP_IPV6_ADDRESS:
5402                         {
5403                                 struct sctp_ipv6addr_param *p6, p6_buf;
5404
5405                                 phdr = sctp_get_next_param(in_initpkt, offset,
5406                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5407                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5408                                     phdr == NULL) {
5409                                         return (1);
5410                                 }
5411                                 if (asoc->scope.ipv6_addr_legal) {
5412                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5413                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5414                                             sizeof(p6->addr));
5415                                         sa_touse = (struct sockaddr *)&sin6;
5416                                 }
5417                                 break;
5418                         }
5419 #endif
5420                 default:
5421                         sa_touse = NULL;
5422                         break;
5423                 }
5424                 if (sa_touse) {
5425                         /* ok, sa_touse points to one to check */
5426                         fnd = 0;
5427                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5428                                 sa = (struct sockaddr *)&net->ro._l_addr;
5429                                 if (sa->sa_family != sa_touse->sa_family) {
5430                                         continue;
5431                                 }
5432 #ifdef INET
5433                                 if (sa->sa_family == AF_INET) {
5434                                         sa4 = (struct sockaddr_in *)sa;
5435                                         if (sa4->sin_addr.s_addr ==
5436                                             sin4.sin_addr.s_addr) {
5437                                                 fnd = 1;
5438                                                 break;
5439                                         }
5440                                 }
5441 #endif
5442 #ifdef INET6
5443                                 if (sa->sa_family == AF_INET6) {
5444                                         sa6 = (struct sockaddr_in6 *)sa;
5445                                         if (SCTP6_ARE_ADDR_EQUAL(
5446                                             sa6, &sin6)) {
5447                                                 fnd = 1;
5448                                                 break;
5449                                         }
5450                                 }
5451 #endif
5452                         }
5453                         if (!fnd) {
5454                                 /* New addr added! no need to look further */
5455                                 return (1);
5456                         }
5457                 }
5458                 offset += SCTP_SIZE32(plen);
5459                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5460         }
5461         return (0);
5462 }
5463
5464 /*
5465  * Given a MBUF chain that was sent into us containing an INIT. Build a
5466  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5467  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5468  * message (i.e. the struct sctp_init_msg).
5469  */
5470 void
5471 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5472     struct sctp_nets *src_net, struct mbuf *init_pkt,
5473     int iphlen, int offset,
5474     struct sockaddr *src, struct sockaddr *dst,
5475     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5476     uint8_t mflowtype, uint32_t mflowid,
5477     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5478 {
5479         struct sctp_association *asoc;
5480         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5481         struct sctp_init_ack_chunk *initack;
5482         struct sctp_adaptation_layer_indication *ali;
5483         struct sctp_supported_chunk_types_param *pr_supported;
5484         struct sctp_paramhdr *ph;
5485         union sctp_sockstore *over_addr;
5486         struct sctp_scoping scp;
5487 #ifdef INET
5488         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5489         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5490         struct sockaddr_in *sin;
5491 #endif
5492 #ifdef INET6
5493         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5494         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5495         struct sockaddr_in6 *sin6;
5496 #endif
5497         struct sockaddr *to;
5498         struct sctp_state_cookie stc;
5499         struct sctp_nets *net = NULL;
5500         uint8_t *signature = NULL;
5501         int cnt_inits_to = 0;
5502         uint16_t his_limit, i_want;
5503         int abort_flag;
5504         int nat_friendly = 0;
5505         struct socket *so;
5506         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5507
5508         if (stcb) {
5509                 asoc = &stcb->asoc;
5510         } else {
5511                 asoc = NULL;
5512         }
5513         if ((asoc != NULL) &&
5514             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5515                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5516                         /*
5517                          * new addresses, out of here in non-cookie-wait
5518                          * states
5519                          *
5520                          * Send an ABORT, without the new address error
5521                          * cause. This looks no different than if no
5522                          * listener was present.
5523                          */
5524                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5525                             "Address added");
5526                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5527                             mflowtype, mflowid, inp->fibnum,
5528                             vrf_id, port);
5529                         return;
5530                 }
5531                 if (src_net != NULL && (src_net->port != port)) {
5532                         /*
5533                          * change of remote encapsulation port, out of here
5534                          * in non-cookie-wait states
5535                          *
5536                          * Send an ABORT, without an specific error cause.
5537                          * This looks no different than if no listener was
5538                          * present.
5539                          */
5540                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5541                             "Remote encapsulation port changed");
5542                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5543                             mflowtype, mflowid, inp->fibnum,
5544                             vrf_id, port);
5545                         return;
5546                 }
5547         }
5548         abort_flag = 0;
5549         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5550             (offset + sizeof(struct sctp_init_chunk)),
5551             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5552         if (abort_flag) {
5553 do_a_abort:
5554                 if (op_err == NULL) {
5555                         char msg[SCTP_DIAG_INFO_LEN];
5556
5557                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5558                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5559                             msg);
5560                 }
5561                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5562                     init_chk->init.initiate_tag, op_err,
5563                     mflowtype, mflowid, inp->fibnum,
5564                     vrf_id, port);
5565                 return;
5566         }
5567         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5568         if (m == NULL) {
5569                 /* No memory, INIT timer will re-attempt. */
5570                 if (op_err)
5571                         sctp_m_freem(op_err);
5572                 return;
5573         }
5574         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5575         padding_len = 0;
5576
5577         /*
5578          * We might not overwrite the identification[] completely and on
5579          * some platforms time_entered will contain some padding. Therefore
5580          * zero out the cookie to avoid putting uninitialized memory on the
5581          * wire.
5582          */
5583         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5584
5585         /* the time I built cookie */
5586         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5587
5588         /* populate any tie tags */
5589         if (asoc != NULL) {
5590                 /* unlock before tag selections */
5591                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5592                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5593                 stc.cookie_life = asoc->cookie_life;
5594                 net = asoc->primary_destination;
5595         } else {
5596                 stc.tie_tag_my_vtag = 0;
5597                 stc.tie_tag_peer_vtag = 0;
5598                 /* life I will award this cookie */
5599                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5600         }
5601
5602         /* copy in the ports for later check */
5603         stc.myport = sh->dest_port;
5604         stc.peerport = sh->src_port;
5605
5606         /*
5607          * If we wanted to honor cookie life extensions, we would add to
5608          * stc.cookie_life. For now we should NOT honor any extension
5609          */
5610         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5611         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5612                 stc.ipv6_addr_legal = 1;
5613                 if (SCTP_IPV6_V6ONLY(inp)) {
5614                         stc.ipv4_addr_legal = 0;
5615                 } else {
5616                         stc.ipv4_addr_legal = 1;
5617                 }
5618         } else {
5619                 stc.ipv6_addr_legal = 0;
5620                 stc.ipv4_addr_legal = 1;
5621         }
5622         stc.ipv4_scope = 0;
5623         if (net == NULL) {
5624                 to = src;
5625                 switch (dst->sa_family) {
5626 #ifdef INET
5627                 case AF_INET:
5628                         {
5629                                 /* lookup address */
5630                                 stc.address[0] = src4->sin_addr.s_addr;
5631                                 stc.address[1] = 0;
5632                                 stc.address[2] = 0;
5633                                 stc.address[3] = 0;
5634                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5635                                 /* local from address */
5636                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5637                                 stc.laddress[1] = 0;
5638                                 stc.laddress[2] = 0;
5639                                 stc.laddress[3] = 0;
5640                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5641                                 /* scope_id is only for v6 */
5642                                 stc.scope_id = 0;
5643                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5644                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5645                                         stc.ipv4_scope = 1;
5646                                 }
5647                                 /* Must use the address in this case */
5648                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5649                                         stc.loopback_scope = 1;
5650                                         stc.ipv4_scope = 1;
5651                                         stc.site_scope = 1;
5652                                         stc.local_scope = 0;
5653                                 }
5654                                 break;
5655                         }
5656 #endif
5657 #ifdef INET6
5658                 case AF_INET6:
5659                         {
5660                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5661                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5662                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5663                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5664                                         stc.loopback_scope = 1;
5665                                         stc.local_scope = 0;
5666                                         stc.site_scope = 1;
5667                                         stc.ipv4_scope = 1;
5668                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5669                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5670                                         /*
5671                                          * If the new destination or source
5672                                          * is a LINK_LOCAL we must have
5673                                          * common both site and local scope.
5674                                          * Don't set local scope though
5675                                          * since we must depend on the
5676                                          * source to be added implicitly. We
5677                                          * cannot assure just because we
5678                                          * share one link that all links are
5679                                          * common.
5680                                          */
5681                                         stc.local_scope = 0;
5682                                         stc.site_scope = 1;
5683                                         stc.ipv4_scope = 1;
5684                                         /*
5685                                          * we start counting for the private
5686                                          * address stuff at 1. since the
5687                                          * link local we source from won't
5688                                          * show up in our scoped count.
5689                                          */
5690                                         cnt_inits_to = 1;
5691                                         /*
5692                                          * pull out the scope_id from
5693                                          * incoming pkt
5694                                          */
5695                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5696                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5697                                         /*
5698                                          * If the new destination or source
5699                                          * is SITE_LOCAL then we must have
5700                                          * site scope in common.
5701                                          */
5702                                         stc.site_scope = 1;
5703                                 }
5704                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5705                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5706                                 break;
5707                         }
5708 #endif
5709                 default:
5710                         /* TSNH */
5711                         goto do_a_abort;
5712                         break;
5713                 }
5714         } else {
5715                 /* set the scope per the existing tcb */
5716
5717 #ifdef INET6
5718                 struct sctp_nets *lnet;
5719 #endif
5720
5721                 stc.loopback_scope = asoc->scope.loopback_scope;
5722                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5723                 stc.site_scope = asoc->scope.site_scope;
5724                 stc.local_scope = asoc->scope.local_scope;
5725 #ifdef INET6
5726                 /* Why do we not consider IPv4 LL addresses? */
5727                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5728                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5729                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5730                                         /*
5731                                          * if we have a LL address, start
5732                                          * counting at 1.
5733                                          */
5734                                         cnt_inits_to = 1;
5735                                 }
5736                         }
5737                 }
5738 #endif
5739                 /* use the net pointer */
5740                 to = (struct sockaddr *)&net->ro._l_addr;
5741                 switch (to->sa_family) {
5742 #ifdef INET
5743                 case AF_INET:
5744                         sin = (struct sockaddr_in *)to;
5745                         stc.address[0] = sin->sin_addr.s_addr;
5746                         stc.address[1] = 0;
5747                         stc.address[2] = 0;
5748                         stc.address[3] = 0;
5749                         stc.addr_type = SCTP_IPV4_ADDRESS;
5750                         if (net->src_addr_selected == 0) {
5751                                 /*
5752                                  * strange case here, the INIT should have
5753                                  * did the selection.
5754                                  */
5755                                 net->ro._s_addr = sctp_source_address_selection(inp,
5756                                     stcb, (sctp_route_t *)&net->ro,
5757                                     net, 0, vrf_id);
5758                                 if (net->ro._s_addr == NULL)
5759                                         return;
5760
5761                                 net->src_addr_selected = 1;
5762
5763                         }
5764                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5765                         stc.laddress[1] = 0;
5766                         stc.laddress[2] = 0;
5767                         stc.laddress[3] = 0;
5768                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5769                         /* scope_id is only for v6 */
5770                         stc.scope_id = 0;
5771                         break;
5772 #endif
5773 #ifdef INET6
5774                 case AF_INET6:
5775                         sin6 = (struct sockaddr_in6 *)to;
5776                         memcpy(&stc.address, &sin6->sin6_addr,
5777                             sizeof(struct in6_addr));
5778                         stc.addr_type = SCTP_IPV6_ADDRESS;
5779                         stc.scope_id = sin6->sin6_scope_id;
5780                         if (net->src_addr_selected == 0) {
5781                                 /*
5782                                  * strange case here, the INIT should have
5783                                  * done the selection.
5784                                  */
5785                                 net->ro._s_addr = sctp_source_address_selection(inp,
5786                                     stcb, (sctp_route_t *)&net->ro,
5787                                     net, 0, vrf_id);
5788                                 if (net->ro._s_addr == NULL)
5789                                         return;
5790
5791                                 net->src_addr_selected = 1;
5792                         }
5793                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5794                             sizeof(struct in6_addr));
5795                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5796                         break;
5797 #endif
5798                 }
5799         }
5800         /* Now lets put the SCTP header in place */
5801         initack = mtod(m, struct sctp_init_ack_chunk *);
5802         /* Save it off for quick ref */
5803         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5804         /* who are we */
5805         memcpy(stc.identification, SCTP_VERSION_STRING,
5806             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5807         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5808         /* now the chunk header */
5809         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5810         initack->ch.chunk_flags = 0;
5811         /* fill in later from mbuf we build */
5812         initack->ch.chunk_length = 0;
5813         /* place in my tag */
5814         if ((asoc != NULL) &&
5815             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5816             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5817             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5818                 /* re-use the v-tags and init-seq here */
5819                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5820                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5821         } else {
5822                 uint32_t vtag, itsn;
5823
5824                 if (hold_inp_lock) {
5825                         SCTP_INP_INCR_REF(inp);
5826                         SCTP_INP_RUNLOCK(inp);
5827                 }
5828                 if (asoc) {
5829                         atomic_add_int(&asoc->refcnt, 1);
5830                         SCTP_TCB_UNLOCK(stcb);
5831         new_tag:
5832                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5833                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5834                                 /*
5835                                  * Got a duplicate vtag on some guy behind a
5836                                  * nat make sure we don't use it.
5837                                  */
5838                                 goto new_tag;
5839                         }
5840                         initack->init.initiate_tag = htonl(vtag);
5841                         /* get a TSN to use too */
5842                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5843                         initack->init.initial_tsn = htonl(itsn);
5844                         SCTP_TCB_LOCK(stcb);
5845                         atomic_add_int(&asoc->refcnt, -1);
5846                 } else {
5847                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5848                         initack->init.initiate_tag = htonl(vtag);
5849                         /* get a TSN to use too */
5850                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5851                 }
5852                 if (hold_inp_lock) {
5853                         SCTP_INP_RLOCK(inp);
5854                         SCTP_INP_DECR_REF(inp);
5855                 }
5856         }
5857         /* save away my tag to */
5858         stc.my_vtag = initack->init.initiate_tag;
5859
5860         /* set up some of the credits. */
5861         so = inp->sctp_socket;
5862         if (so == NULL) {
5863                 /* memory problem */
5864                 sctp_m_freem(m);
5865                 return;
5866         } else {
5867                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5868         }
5869         /* set what I want */
5870         his_limit = ntohs(init_chk->init.num_inbound_streams);
5871         /* choose what I want */
5872         if (asoc != NULL) {
5873                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5874                         i_want = asoc->streamoutcnt;
5875                 } else {
5876                         i_want = asoc->pre_open_streams;
5877                 }
5878         } else {
5879                 i_want = inp->sctp_ep.pre_open_stream_count;
5880         }
5881         if (his_limit < i_want) {
5882                 /* I Want more :< */
5883                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5884         } else {
5885                 /* I can have what I want :> */
5886                 initack->init.num_outbound_streams = htons(i_want);
5887         }
5888         /* tell him his limit. */
5889         initack->init.num_inbound_streams =
5890             htons(inp->sctp_ep.max_open_streams_intome);
5891
5892         /* adaptation layer indication parameter */
5893         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5894                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5895                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5896                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5897                 ali->ph.param_length = htons(parameter_len);
5898                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5899                 chunk_len += parameter_len;
5900         }
5901         /* ECN parameter */
5902         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5903             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5904                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5905                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5906                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5907                 ph->param_length = htons(parameter_len);
5908                 chunk_len += parameter_len;
5909         }
5910         /* PR-SCTP supported parameter */
5911         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5912             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5913                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5914                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5915                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5916                 ph->param_length = htons(parameter_len);
5917                 chunk_len += parameter_len;
5918         }
5919         /* Add NAT friendly parameter */
5920         if (nat_friendly) {
5921                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5922                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5923                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5924                 ph->param_length = htons(parameter_len);
5925                 chunk_len += parameter_len;
5926         }
5927         /* And now tell the peer which extensions we support */
5928         num_ext = 0;
5929         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5930         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5931             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5932                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5933                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5934                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5935                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5936                 }
5937         }
5938         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5939             ((asoc == NULL) && (inp->auth_supported == 1))) {
5940                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5941         }
5942         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5943             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5944                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5945                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5946         }
5947         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5948             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5949                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5950         }
5951         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5952             ((asoc == NULL) && (inp->idata_supported == 1))) {
5953                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5954         }
5955         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5956             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5957                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5958         }
5959         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5960             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5961                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5962         }
5963         if (num_ext > 0) {
5964                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5965                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5966                 pr_supported->ph.param_length = htons(parameter_len);
5967                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5968                 chunk_len += parameter_len;
5969         }
5970         /* add authentication parameters */
5971         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5972             ((asoc == NULL) && (inp->auth_supported == 1))) {
5973                 struct sctp_auth_random *randp;
5974                 struct sctp_auth_hmac_algo *hmacs;
5975                 struct sctp_auth_chunk_list *chunks;
5976
5977                 if (padding_len > 0) {
5978                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5979                         chunk_len += padding_len;
5980                         padding_len = 0;
5981                 }
5982                 /* generate and add RANDOM parameter */
5983                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5984                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5985                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5986                 randp->ph.param_type = htons(SCTP_RANDOM);
5987                 randp->ph.param_length = htons(parameter_len);
5988                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5989                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5990                 chunk_len += parameter_len;
5991
5992                 if (padding_len > 0) {
5993                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5994                         chunk_len += padding_len;
5995                         padding_len = 0;
5996                 }
5997                 /* add HMAC_ALGO parameter */
5998                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5999                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6000                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6001                     (uint8_t *)hmacs->hmac_ids);
6002                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6003                 hmacs->ph.param_length = htons(parameter_len);
6004                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6005                 chunk_len += parameter_len;
6006
6007                 if (padding_len > 0) {
6008                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6009                         chunk_len += padding_len;
6010                         padding_len = 0;
6011                 }
6012                 /* add CHUNKS parameter */
6013                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6014                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6015                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6016                     chunks->chunk_types);
6017                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6018                 chunks->ph.param_length = htons(parameter_len);
6019                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6020                 chunk_len += parameter_len;
6021         }
6022         SCTP_BUF_LEN(m) = chunk_len;
6023         m_last = m;
6024         /* now the addresses */
6025         /*
6026          * To optimize this we could put the scoping stuff into a structure
6027          * and remove the individual uint8's from the stc structure. Then we
6028          * could just sifa in the address within the stc.. but for now this
6029          * is a quick hack to get the address stuff teased apart.
6030          */
6031         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6032         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6033         scp.loopback_scope = stc.loopback_scope;
6034         scp.ipv4_local_scope = stc.ipv4_scope;
6035         scp.local_scope = stc.local_scope;
6036         scp.site_scope = stc.site_scope;
6037         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6038             cnt_inits_to,
6039             &padding_len, &chunk_len);
6040         /* padding_len can only be positive, if no addresses have been added */
6041         if (padding_len > 0) {
6042                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6043                 chunk_len += padding_len;
6044                 SCTP_BUF_LEN(m) += padding_len;
6045                 padding_len = 0;
6046         }
6047         /* tack on the operational error if present */
6048         if (op_err) {
6049                 parameter_len = 0;
6050                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6051                         parameter_len += SCTP_BUF_LEN(m_tmp);
6052                 }
6053                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6054                 SCTP_BUF_NEXT(m_last) = op_err;
6055                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6056                         m_last = SCTP_BUF_NEXT(m_last);
6057                 }
6058                 chunk_len += parameter_len;
6059         }
6060         if (padding_len > 0) {
6061                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6062                 if (m_last == NULL) {
6063                         /* Houston we have a problem, no space */
6064                         sctp_m_freem(m);
6065                         return;
6066                 }
6067                 chunk_len += padding_len;
6068                 padding_len = 0;
6069         }
6070         /* Now we must build a cookie */
6071         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6072         if (m_cookie == NULL) {
6073                 /* memory problem */
6074                 sctp_m_freem(m);
6075                 return;
6076         }
6077         /* Now append the cookie to the end and update the space/size */
6078         SCTP_BUF_NEXT(m_last) = m_cookie;
6079         parameter_len = 0;
6080         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6081                 parameter_len += SCTP_BUF_LEN(m_tmp);
6082                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6083                         m_last = m_tmp;
6084                 }
6085         }
6086         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6087         chunk_len += parameter_len;
6088
6089         /*
6090          * Place in the size, but we don't include the last pad (if any) in
6091          * the INIT-ACK.
6092          */
6093         initack->ch.chunk_length = htons(chunk_len);
6094
6095         /*
6096          * Time to sign the cookie, we don't sign over the cookie signature
6097          * though thus we set trailer.
6098          */
6099         (void)sctp_hmac_m(SCTP_HMAC,
6100             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6101             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6102             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6103         /*
6104          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6105          * here since the timer will drive a retranmission.
6106          */
6107         if (padding_len > 0) {
6108                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6109                         sctp_m_freem(m);
6110                         return;
6111                 }
6112         }
6113         if (stc.loopback_scope) {
6114                 over_addr = (union sctp_sockstore *)dst;
6115         } else {
6116                 over_addr = NULL;
6117         }
6118
6119         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6120             0, 0,
6121             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6122             port, over_addr,
6123             mflowtype, mflowid,
6124             SCTP_SO_NOT_LOCKED);
6125         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6126 }
6127
6128
6129 static void
6130 sctp_prune_prsctp(struct sctp_tcb *stcb,
6131     struct sctp_association *asoc,
6132     struct sctp_sndrcvinfo *srcv,
6133     int dataout)
6134 {
6135         int freed_spc = 0;
6136         struct sctp_tmit_chunk *chk, *nchk;
6137
6138         SCTP_TCB_LOCK_ASSERT(stcb);
6139         if ((asoc->prsctp_supported) &&
6140             (asoc->sent_queue_cnt_removeable > 0)) {
6141                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6142                         /*
6143                          * Look for chunks marked with the PR_SCTP flag AND
6144                          * the buffer space flag. If the one being sent is
6145                          * equal or greater priority then purge the old one
6146                          * and free some space.
6147                          */
6148                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6149                                 /*
6150                                  * This one is PR-SCTP AND buffer space
6151                                  * limited type
6152                                  */
6153                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6154                                         /*
6155                                          * Lower numbers equates to higher
6156                                          * priority so if the one we are
6157                                          * looking at has a larger or equal
6158                                          * priority we want to drop the data
6159                                          * and NOT retransmit it.
6160                                          */
6161                                         if (chk->data) {
6162                                                 /*
6163                                                  * We release the book_size
6164                                                  * if the mbuf is here
6165                                                  */
6166                                                 int ret_spc;
6167                                                 uint8_t sent;
6168
6169                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6170                                                         sent = 1;
6171                                                 else
6172                                                         sent = 0;
6173                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6174                                                     sent,
6175                                                     SCTP_SO_LOCKED);
6176                                                 freed_spc += ret_spc;
6177                                                 if (freed_spc >= dataout) {
6178                                                         return;
6179                                                 }
6180                                         }       /* if chunk was present */
6181                                 }       /* if of sufficient priority */
6182                         }       /* if chunk has enabled */
6183                 }               /* tailqforeach */
6184
6185                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6186                         /* Here we must move to the sent queue and mark */
6187                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6188                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6189                                         if (chk->data) {
6190                                                 /*
6191                                                  * We release the book_size
6192                                                  * if the mbuf is here
6193                                                  */
6194                                                 int ret_spc;
6195
6196                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6197                                                     0, SCTP_SO_LOCKED);
6198
6199                                                 freed_spc += ret_spc;
6200                                                 if (freed_spc >= dataout) {
6201                                                         return;
6202                                                 }
6203                                         }       /* end if chk->data */
6204                                 }       /* end if right class */
6205                         }       /* end if chk pr-sctp */
6206                 }               /* tailqforeachsafe (chk) */
6207         }                       /* if enabled in asoc */
6208 }
6209
6210 int
6211 sctp_get_frag_point(struct sctp_tcb *stcb,
6212     struct sctp_association *asoc)
6213 {
6214         int siz, ovh;
6215
6216         /*
6217          * For endpoints that have both v6 and v4 addresses we must reserve
6218          * room for the ipv6 header, for those that are only dealing with V4
6219          * we use a larger frag point.
6220          */
6221         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6222                 ovh = SCTP_MIN_OVERHEAD;
6223         } else {
6224                 ovh = SCTP_MIN_V4_OVERHEAD;
6225         }
6226         if (stcb->asoc.idata_supported) {
6227                 ovh += sizeof(struct sctp_idata_chunk);
6228         } else {
6229                 ovh += sizeof(struct sctp_data_chunk);
6230         }
6231         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6232                 siz = asoc->smallest_mtu - ovh;
6233         else
6234                 siz = (stcb->asoc.sctp_frag_point - ovh);
6235         /*
6236          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6237          */
6238         /* A data chunk MUST fit in a cluster */
6239         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6240         /* } */
6241
6242         /* adjust for an AUTH chunk if DATA requires auth */
6243         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6244                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6245
6246         if (siz % 4) {
6247                 /* make it an even word boundary please */
6248                 siz -= (siz % 4);
6249         }
6250         return (siz);
6251 }
6252
6253 static void
6254 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6255 {
6256         /*
6257          * We assume that the user wants PR_SCTP_TTL if the user provides a
6258          * positive lifetime but does not specify any PR_SCTP policy.
6259          */
6260         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6261                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6262         } else if (sp->timetolive > 0) {
6263                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6264                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6265         } else {
6266                 return;
6267         }
6268         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6269         case CHUNK_FLAGS_PR_SCTP_BUF:
6270                 /*
6271                  * Time to live is a priority stored in tv_sec when doing
6272                  * the buffer drop thing.
6273                  */
6274                 sp->ts.tv_sec = sp->timetolive;
6275                 sp->ts.tv_usec = 0;
6276                 break;
6277         case CHUNK_FLAGS_PR_SCTP_TTL:
6278                 {
6279                         struct timeval tv;
6280
6281                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6282                         tv.tv_sec = sp->timetolive / 1000;
6283                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6284                         /*
6285                          * TODO sctp_constants.h needs alternative time
6286                          * macros when _KERNEL is undefined.
6287                          */
6288                         timevaladd(&sp->ts, &tv);
6289                 }
6290                 break;
6291         case CHUNK_FLAGS_PR_SCTP_RTX:
6292                 /*
6293                  * Time to live is a the number or retransmissions stored in
6294                  * tv_sec.
6295                  */
6296                 sp->ts.tv_sec = sp->timetolive;
6297                 sp->ts.tv_usec = 0;
6298                 break;
6299         default:
6300                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6301                     "Unknown PR_SCTP policy %u.\n",
6302                     PR_SCTP_POLICY(sp->sinfo_flags));
6303                 break;
6304         }
6305 }
6306
6307 static int
6308 sctp_msg_append(struct sctp_tcb *stcb,
6309     struct sctp_nets *net,
6310     struct mbuf *m,
6311     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6312 {
6313         int error = 0;
6314         struct mbuf *at;
6315         struct sctp_stream_queue_pending *sp = NULL;
6316         struct sctp_stream_out *strm;
6317
6318         /*
6319          * Given an mbuf chain, put it into the association send queue and
6320          * place it on the wheel
6321          */
6322         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6323                 /* Invalid stream number */
6324                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6325                 error = EINVAL;
6326                 goto out_now;
6327         }
6328         if ((stcb->asoc.stream_locked) &&
6329             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6330                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6331                 error = EINVAL;
6332                 goto out_now;
6333         }
6334         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6335         /* Now can we send this? */
6336         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6337             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6338             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6339             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6340                 /* got data while shutting down */
6341                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6342                 error = ECONNRESET;
6343                 goto out_now;
6344         }
6345         sctp_alloc_a_strmoq(stcb, sp);
6346         if (sp == NULL) {
6347                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6348                 error = ENOMEM;
6349                 goto out_now;
6350         }
6351         sp->sinfo_flags = srcv->sinfo_flags;
6352         sp->timetolive = srcv->sinfo_timetolive;
6353         sp->ppid = srcv->sinfo_ppid;
6354         sp->context = srcv->sinfo_context;
6355         sp->fsn = 0;
6356         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6357                 sp->net = net;
6358                 atomic_add_int(&sp->net->ref_count, 1);
6359         } else {
6360                 sp->net = NULL;
6361         }
6362         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6363         sp->sid = srcv->sinfo_stream;
6364         sp->msg_is_complete = 1;
6365         sp->sender_all_done = 1;
6366         sp->some_taken = 0;
6367         sp->data = m;
6368         sp->tail_mbuf = NULL;
6369         sctp_set_prsctp_policy(sp);
6370         /*
6371          * We could in theory (for sendall) sifa the length in, but we would
6372          * still have to hunt through the chain since we need to setup the
6373          * tail_mbuf
6374          */
6375         sp->length = 0;
6376         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6377                 if (SCTP_BUF_NEXT(at) == NULL)
6378                         sp->tail_mbuf = at;
6379                 sp->length += SCTP_BUF_LEN(at);
6380         }
6381         if (srcv->sinfo_keynumber_valid) {
6382                 sp->auth_keyid = srcv->sinfo_keynumber;
6383         } else {
6384                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6385         }
6386         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6387                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6388                 sp->holds_key_ref = 1;
6389         }
6390         if (hold_stcb_lock == 0) {
6391                 SCTP_TCB_SEND_LOCK(stcb);
6392         }
6393         sctp_snd_sb_alloc(stcb, sp->length);
6394         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6395         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6396         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6397         m = NULL;
6398         if (hold_stcb_lock == 0) {
6399                 SCTP_TCB_SEND_UNLOCK(stcb);
6400         }
6401 out_now:
6402         if (m) {
6403                 sctp_m_freem(m);
6404         }
6405         return (error);
6406 }
6407
6408
6409 static struct mbuf *
6410 sctp_copy_mbufchain(struct mbuf *clonechain,
6411     struct mbuf *outchain,
6412     struct mbuf **endofchain,
6413     int can_take_mbuf,
6414     int sizeofcpy,
6415     uint8_t copy_by_ref)
6416 {
6417         struct mbuf *m;
6418         struct mbuf *appendchain;
6419         caddr_t cp;
6420         int len;
6421
6422         if (endofchain == NULL) {
6423                 /* error */
6424 error_out:
6425                 if (outchain)
6426                         sctp_m_freem(outchain);
6427                 return (NULL);
6428         }
6429         if (can_take_mbuf) {
6430                 appendchain = clonechain;
6431         } else {
6432                 if (!copy_by_ref &&
6433                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6434                     ) {
6435                         /* Its not in a cluster */
6436                         if (*endofchain == NULL) {
6437                                 /* lets get a mbuf cluster */
6438                                 if (outchain == NULL) {
6439                                         /* This is the general case */
6440                         new_mbuf:
6441                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6442                                         if (outchain == NULL) {
6443                                                 goto error_out;
6444                                         }
6445                                         SCTP_BUF_LEN(outchain) = 0;
6446                                         *endofchain = outchain;
6447                                         /* get the prepend space */
6448                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6449                                 } else {
6450                                         /*
6451                                          * We really should not get a NULL
6452                                          * in endofchain
6453                                          */
6454                                         /* find end */
6455                                         m = outchain;
6456                                         while (m) {
6457                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6458                                                         *endofchain = m;
6459                                                         break;
6460                                                 }
6461                                                 m = SCTP_BUF_NEXT(m);
6462                                         }
6463                                         /* sanity */
6464                                         if (*endofchain == NULL) {
6465                                                 /*
6466                                                  * huh, TSNH XXX maybe we
6467                                                  * should panic
6468                                                  */
6469                                                 sctp_m_freem(outchain);
6470                                                 goto new_mbuf;
6471                                         }
6472                                 }
6473                                 /* get the new end of length */
6474                                 len = (int)M_TRAILINGSPACE(*endofchain);
6475                         } else {
6476                                 /* how much is left at the end? */
6477                                 len = (int)M_TRAILINGSPACE(*endofchain);
6478                         }
6479                         /* Find the end of the data, for appending */
6480                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6481
6482                         /* Now lets copy it out */
6483                         if (len >= sizeofcpy) {
6484                                 /* It all fits, copy it in */
6485                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6486                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6487                         } else {
6488                                 /* fill up the end of the chain */
6489                                 if (len > 0) {
6490                                         m_copydata(clonechain, 0, len, cp);
6491                                         SCTP_BUF_LEN((*endofchain)) += len;
6492                                         /* now we need another one */
6493                                         sizeofcpy -= len;
6494                                 }
6495                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6496                                 if (m == NULL) {
6497                                         /* We failed */
6498                                         goto error_out;
6499                                 }
6500                                 SCTP_BUF_NEXT((*endofchain)) = m;
6501                                 *endofchain = m;
6502                                 cp = mtod((*endofchain), caddr_t);
6503                                 m_copydata(clonechain, len, sizeofcpy, cp);
6504                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6505                         }
6506                         return (outchain);
6507                 } else {
6508                         /* copy the old fashion way */
6509                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6510 #ifdef SCTP_MBUF_LOGGING
6511                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6512                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6513                         }
6514 #endif
6515                 }
6516         }
6517         if (appendchain == NULL) {
6518                 /* error */
6519                 if (outchain)
6520                         sctp_m_freem(outchain);
6521                 return (NULL);
6522         }
6523         if (outchain) {
6524                 /* tack on to the end */
6525                 if (*endofchain != NULL) {
6526                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6527                 } else {
6528                         m = outchain;
6529                         while (m) {
6530                                 if (SCTP_BUF_NEXT(m) == NULL) {
6531                                         SCTP_BUF_NEXT(m) = appendchain;
6532                                         break;
6533                                 }
6534                                 m = SCTP_BUF_NEXT(m);
6535                         }
6536                 }
6537                 /*
6538                  * save off the end and update the end-chain position
6539                  */
6540                 m = appendchain;
6541                 while (m) {
6542                         if (SCTP_BUF_NEXT(m) == NULL) {
6543                                 *endofchain = m;
6544                                 break;
6545                         }
6546                         m = SCTP_BUF_NEXT(m);
6547                 }
6548                 return (outchain);
6549         } else {
6550                 /* save off the end and update the end-chain position */
6551                 m = appendchain;
6552                 while (m) {
6553                         if (SCTP_BUF_NEXT(m) == NULL) {
6554                                 *endofchain = m;
6555                                 break;
6556                         }
6557                         m = SCTP_BUF_NEXT(m);
6558                 }
6559                 return (appendchain);
6560         }
6561 }
6562
6563 static int
6564 sctp_med_chunk_output(struct sctp_inpcb *inp,
6565     struct sctp_tcb *stcb,
6566     struct sctp_association *asoc,
6567     int *num_out,
6568     int *reason_code,
6569     int control_only, int from_where,
6570     struct timeval *now, int *now_filled, int frag_point, int so_locked
6571 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6572     SCTP_UNUSED
6573 #endif
6574 );
6575
6576 static void
6577 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6578     uint32_t val SCTP_UNUSED)
6579 {
6580         struct sctp_copy_all *ca;
6581         struct mbuf *m;
6582         int ret = 0;
6583         int added_control = 0;
6584         int un_sent, do_chunk_output = 1;
6585         struct sctp_association *asoc;
6586         struct sctp_nets *net;
6587
6588         ca = (struct sctp_copy_all *)ptr;
6589         if (ca->m == NULL) {
6590                 return;
6591         }
6592         if (ca->inp != inp) {
6593                 /* TSNH */
6594                 return;
6595         }
6596         if (ca->sndlen > 0) {
6597                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6598                 if (m == NULL) {
6599                         /* can't copy so we are done */
6600                         ca->cnt_failed++;
6601                         return;
6602                 }
6603 #ifdef SCTP_MBUF_LOGGING
6604                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6605                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6606                 }
6607 #endif
6608         } else {
6609                 m = NULL;
6610         }
6611         SCTP_TCB_LOCK_ASSERT(stcb);
6612         if (stcb->asoc.alternate) {
6613                 net = stcb->asoc.alternate;
6614         } else {
6615                 net = stcb->asoc.primary_destination;
6616         }
6617         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6618                 /* Abort this assoc with m as the user defined reason */
6619                 if (m != NULL) {
6620                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6621                 } else {
6622                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6623                             0, M_NOWAIT, 1, MT_DATA);
6624                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6625                 }
6626                 if (m != NULL) {
6627                         struct sctp_paramhdr *ph;
6628
6629                         ph = mtod(m, struct sctp_paramhdr *);
6630                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6631                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6632                 }
6633                 /*
6634                  * We add one here to keep the assoc from dis-appearing on
6635                  * us.
6636                  */
6637                 atomic_add_int(&stcb->asoc.refcnt, 1);
6638                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6639                 /*
6640                  * sctp_abort_an_association calls sctp_free_asoc() free
6641                  * association will NOT free it since we incremented the
6642                  * refcnt .. we do this to prevent it being freed and things
6643                  * getting tricky since we could end up (from free_asoc)
6644                  * calling inpcb_free which would get a recursive lock call
6645                  * to the iterator lock.. But as a consequence of that the
6646                  * stcb will return to us un-locked.. since free_asoc
6647                  * returns with either no TCB or the TCB unlocked, we must
6648                  * relock.. to unlock in the iterator timer :-0
6649                  */
6650                 SCTP_TCB_LOCK(stcb);
6651                 atomic_add_int(&stcb->asoc.refcnt, -1);
6652                 goto no_chunk_output;
6653         } else {
6654                 if (m) {
6655                         ret = sctp_msg_append(stcb, net, m,
6656                             &ca->sndrcv, 1);
6657                 }
6658                 asoc = &stcb->asoc;
6659                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6660                         /* shutdown this assoc */
6661                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6662                             TAILQ_EMPTY(&asoc->sent_queue) &&
6663                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6664                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6665                                         goto abort_anyway;
6666                                 }
6667                                 /*
6668                                  * there is nothing queued to send, so I'm
6669                                  * done...
6670                                  */
6671                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6672                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6673                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6674                                         /*
6675                                          * only send SHUTDOWN the first time
6676                                          * through
6677                                          */
6678                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6679                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6680                                         }
6681                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6682                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6683                                         sctp_stop_timers_for_shutdown(stcb);
6684                                         sctp_send_shutdown(stcb, net);
6685                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6686                                             net);
6687                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6688                                             asoc->primary_destination);
6689                                         added_control = 1;
6690                                         do_chunk_output = 0;
6691                                 }
6692                         } else {
6693                                 /*
6694                                  * we still got (or just got) data to send,
6695                                  * so set SHUTDOWN_PENDING
6696                                  */
6697                                 /*
6698                                  * XXX sockets draft says that SCTP_EOF
6699                                  * should be sent with no data.  currently,
6700                                  * we will allow user data to be sent first
6701                                  * and move to SHUTDOWN-PENDING
6702                                  */
6703                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6704                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6705                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6706                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6707                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6708                                         }
6709                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6710                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6711                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6712                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6713                                                 struct mbuf *op_err;
6714                                                 char msg[SCTP_DIAG_INFO_LEN];
6715
6716                                 abort_anyway:
6717                                                 snprintf(msg, sizeof(msg),
6718                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6719                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6720                                                     msg);
6721                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6722                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6723                                                     op_err, SCTP_SO_NOT_LOCKED);
6724                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6725                                                 goto no_chunk_output;
6726                                         }
6727                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6728                                             asoc->primary_destination);
6729                                 }
6730                         }
6731
6732                 }
6733         }
6734         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6735             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6736
6737         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6738             (stcb->asoc.total_flight > 0) &&
6739             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6740                 do_chunk_output = 0;
6741         }
6742         if (do_chunk_output)
6743                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6744         else if (added_control) {
6745                 int num_out, reason, now_filled = 0;
6746                 struct timeval now;
6747                 int frag_point;
6748
6749                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6750                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6751                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6752         }
6753 no_chunk_output:
6754         if (ret) {
6755                 ca->cnt_failed++;
6756         } else {
6757                 ca->cnt_sent++;
6758         }
6759 }
6760
6761 static void
6762 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6763 {
6764         struct sctp_copy_all *ca;
6765
6766         ca = (struct sctp_copy_all *)ptr;
6767         /*
6768          * Do a notify here? Kacheong suggests that the notify be done at
6769          * the send time.. so you would push up a notification if any send
6770          * failed. Don't know if this is feasible since the only failures we
6771          * have is "memory" related and if you cannot get an mbuf to send
6772          * the data you surely can't get an mbuf to send up to notify the
6773          * user you can't send the data :->
6774          */
6775
6776         /* now free everything */
6777         sctp_m_freem(ca->m);
6778         SCTP_FREE(ca, SCTP_M_COPYAL);
6779 }
6780
6781 static struct mbuf *
6782 sctp_copy_out_all(struct uio *uio, int len)
6783 {
6784         struct mbuf *ret, *at;
6785         int left, willcpy, cancpy, error;
6786
6787         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6788         if (ret == NULL) {
6789                 /* TSNH */
6790                 return (NULL);
6791         }
6792         left = len;
6793         SCTP_BUF_LEN(ret) = 0;
6794         /* save space for the data chunk header */
6795         cancpy = (int)M_TRAILINGSPACE(ret);
6796         willcpy = min(cancpy, left);
6797         at = ret;
6798         while (left > 0) {
6799                 /* Align data to the end */
6800                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6801                 if (error) {
6802         err_out_now:
6803                         sctp_m_freem(at);
6804                         return (NULL);
6805                 }
6806                 SCTP_BUF_LEN(at) = willcpy;
6807                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6808                 left -= willcpy;
6809                 if (left > 0) {
6810                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6811                         if (SCTP_BUF_NEXT(at) == NULL) {
6812                                 goto err_out_now;
6813                         }
6814                         at = SCTP_BUF_NEXT(at);
6815                         SCTP_BUF_LEN(at) = 0;
6816                         cancpy = (int)M_TRAILINGSPACE(at);
6817                         willcpy = min(cancpy, left);
6818                 }
6819         }
6820         return (ret);
6821 }
6822
6823 static int
6824 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6825     struct sctp_sndrcvinfo *srcv)
6826 {
6827         int ret;
6828         struct sctp_copy_all *ca;
6829
6830         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6831             SCTP_M_COPYAL);
6832         if (ca == NULL) {
6833                 sctp_m_freem(m);
6834                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6835                 return (ENOMEM);
6836         }
6837         memset(ca, 0, sizeof(struct sctp_copy_all));
6838
6839         ca->inp = inp;
6840         if (srcv) {
6841                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6842         }
6843         /*
6844          * take off the sendall flag, it would be bad if we failed to do
6845          * this :-0
6846          */
6847         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6848         /* get length and mbuf chain */
6849         if (uio) {
6850                 ca->sndlen = (int)uio->uio_resid;
6851                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6852                 if (ca->m == NULL) {
6853                         SCTP_FREE(ca, SCTP_M_COPYAL);
6854                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6855                         return (ENOMEM);
6856                 }
6857         } else {
6858                 /* Gather the length of the send */
6859                 struct mbuf *mat;
6860
6861                 ca->sndlen = 0;
6862                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6863                         ca->sndlen += SCTP_BUF_LEN(mat);
6864                 }
6865         }
6866         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6867             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6868             SCTP_ASOC_ANY_STATE,
6869             (void *)ca, 0,
6870             sctp_sendall_completes, inp, 1);
6871         if (ret) {
6872                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6873                 SCTP_FREE(ca, SCTP_M_COPYAL);
6874                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6875                 return (EFAULT);
6876         }
6877         return (0);
6878 }
6879
6880
6881 void
6882 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6883 {
6884         struct sctp_tmit_chunk *chk, *nchk;
6885
6886         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6887                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6888                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6889                         if (chk->data) {
6890                                 sctp_m_freem(chk->data);
6891                                 chk->data = NULL;
6892                         }
6893                         asoc->ctrl_queue_cnt--;
6894                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6895                 }
6896         }
6897 }
6898
6899 void
6900 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6901 {
6902         struct sctp_association *asoc;
6903         struct sctp_tmit_chunk *chk, *nchk;
6904         struct sctp_asconf_chunk *acp;
6905
6906         asoc = &stcb->asoc;
6907         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6908                 /* find SCTP_ASCONF chunk in queue */
6909                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6910                         if (chk->data) {
6911                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6912                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6913                                         /* Not Acked yet */
6914                                         break;
6915                                 }
6916                         }
6917                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6918                         if (chk->data) {
6919                                 sctp_m_freem(chk->data);
6920                                 chk->data = NULL;
6921                         }
6922                         asoc->ctrl_queue_cnt--;
6923                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6924                 }
6925         }
6926 }
6927
6928
6929 static void
6930 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6931     struct sctp_association *asoc,
6932     struct sctp_tmit_chunk **data_list,
6933     int bundle_at,
6934     struct sctp_nets *net)
6935 {
6936         int i;
6937         struct sctp_tmit_chunk *tp1;
6938
6939         for (i = 0; i < bundle_at; i++) {
6940                 /* off of the send queue */
6941                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6942                 asoc->send_queue_cnt--;
6943                 if (i > 0) {
6944                         /*
6945                          * Any chunk NOT 0 you zap the time chunk 0 gets
6946                          * zapped or set based on if a RTO measurment is
6947                          * needed.
6948                          */
6949                         data_list[i]->do_rtt = 0;
6950                 }
6951                 /* record time */
6952                 data_list[i]->sent_rcv_time = net->last_sent_time;
6953                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6954                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6955                 if (data_list[i]->whoTo == NULL) {
6956                         data_list[i]->whoTo = net;
6957                         atomic_add_int(&net->ref_count, 1);
6958                 }
6959                 /* on to the sent queue */
6960                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6961                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6962                         struct sctp_tmit_chunk *tpp;
6963
6964                         /* need to move back */
6965         back_up_more:
6966                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6967                         if (tpp == NULL) {
6968                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6969                                 goto all_done;
6970                         }
6971                         tp1 = tpp;
6972                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6973                                 goto back_up_more;
6974                         }
6975                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6976                 } else {
6977                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6978                             data_list[i],
6979                             sctp_next);
6980                 }
6981 all_done:
6982                 /* This does not lower until the cum-ack passes it */
6983                 asoc->sent_queue_cnt++;
6984                 if ((asoc->peers_rwnd <= 0) &&
6985                     (asoc->total_flight == 0) &&
6986                     (bundle_at == 1)) {
6987                         /* Mark the chunk as being a window probe */
6988                         SCTP_STAT_INCR(sctps_windowprobed);
6989                 }
6990 #ifdef SCTP_AUDITING_ENABLED
6991                 sctp_audit_log(0xC2, 3);
6992 #endif
6993                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6994                 data_list[i]->snd_count = 1;
6995                 data_list[i]->rec.data.chunk_was_revoked = 0;
6996                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6997                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6998                             data_list[i]->whoTo->flight_size,
6999                             data_list[i]->book_size,
7000                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7001                             data_list[i]->rec.data.tsn);
7002                 }
7003                 sctp_flight_size_increase(data_list[i]);
7004                 sctp_total_flight_increase(stcb, data_list[i]);
7005                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7006                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7007                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7008                 }
7009                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7010                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7011                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7012                         /* SWS sender side engages */
7013                         asoc->peers_rwnd = 0;
7014                 }
7015         }
7016         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7017                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7018         }
7019 }
7020
7021 static void
7022 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7023 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7024     SCTP_UNUSED
7025 #endif
7026 )
7027 {
7028         struct sctp_tmit_chunk *chk, *nchk;
7029
7030         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7031                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7032                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7033                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7034                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7035                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7036                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7037                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7038                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7039                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7040                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7041                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7042                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7043                         /* Stray chunks must be cleaned up */
7044         clean_up_anyway:
7045                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7046                         if (chk->data) {
7047                                 sctp_m_freem(chk->data);
7048                                 chk->data = NULL;
7049                         }
7050                         asoc->ctrl_queue_cnt--;
7051                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7052                                 asoc->fwd_tsn_cnt--;
7053                         sctp_free_a_chunk(stcb, chk, so_locked);
7054                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7055                         /* special handling, we must look into the param */
7056                         if (chk != asoc->str_reset) {
7057                                 goto clean_up_anyway;
7058                         }
7059                 }
7060         }
7061 }
7062
7063
7064 static int
7065 sctp_can_we_split_this(struct sctp_tcb *stcb,
7066     uint32_t length,
7067     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7068 {
7069         /*
7070          * Make a decision on if I should split a msg into multiple parts.
7071          * This is only asked of incomplete messages.
7072          */
7073         if (eeor_on) {
7074                 /*
7075                  * If we are doing EEOR we need to always send it if its the
7076                  * entire thing, since it might be all the guy is putting in
7077                  * the hopper.
7078                  */
7079                 if (goal_mtu >= length) {
7080                         /*-
7081                          * If we have data outstanding,
7082                          * we get another chance when the sack
7083                          * arrives to transmit - wait for more data
7084                          */
7085                         if (stcb->asoc.total_flight == 0) {
7086                                 /*
7087                                  * If nothing is in flight, we zero the
7088                                  * packet counter.
7089                                  */
7090                                 return (length);
7091                         }
7092                         return (0);
7093
7094                 } else {
7095                         /* You can fill the rest */
7096                         return (goal_mtu);
7097                 }
7098         }
7099         /*-
7100          * For those strange folk that make the send buffer
7101          * smaller than our fragmentation point, we can't
7102          * get a full msg in so we have to allow splitting.
7103          */
7104         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7105                 return (length);
7106         }
7107         if ((length <= goal_mtu) ||
7108             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7109                 /* Sub-optimial residual don't split in non-eeor mode. */
7110                 return (0);
7111         }
7112         /*
7113          * If we reach here length is larger than the goal_mtu. Do we wish
7114          * to split it for the sake of packet putting together?
7115          */
7116         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7117                 /* Its ok to split it */
7118                 return (min(goal_mtu, frag_point));
7119         }
7120         /* Nope, can't split */
7121         return (0);
7122
7123 }
7124
7125 static uint32_t
7126 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7127     struct sctp_stream_out *strq,
7128     uint32_t goal_mtu,
7129     uint32_t frag_point,
7130     int *giveup,
7131     int eeor_mode,
7132     int *bail,
7133     int so_locked
7134 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7135     SCTP_UNUSED
7136 #endif
7137 )
7138 {
7139         /* Move from the stream to the send_queue keeping track of the total */
7140         struct sctp_association *asoc;
7141         struct sctp_stream_queue_pending *sp;
7142         struct sctp_tmit_chunk *chk;
7143         struct sctp_data_chunk *dchkh = NULL;
7144         struct sctp_idata_chunk *ndchkh = NULL;
7145         uint32_t to_move, length;
7146         int leading;
7147         uint8_t rcv_flags = 0;
7148         uint8_t some_taken;
7149         uint8_t send_lock_up = 0;
7150
7151         SCTP_TCB_LOCK_ASSERT(stcb);
7152         asoc = &stcb->asoc;
7153 one_more_time:
7154         /* sa_ignore FREED_MEMORY */
7155         sp = TAILQ_FIRST(&strq->outqueue);
7156         if (sp == NULL) {
7157                 if (send_lock_up == 0) {
7158                         SCTP_TCB_SEND_LOCK(stcb);
7159                         send_lock_up = 1;
7160                 }
7161                 sp = TAILQ_FIRST(&strq->outqueue);
7162                 if (sp) {
7163                         goto one_more_time;
7164                 }
7165                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7166                     (stcb->asoc.idata_supported == 0) &&
7167                     (strq->last_msg_incomplete)) {
7168                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7169                             strq->sid,
7170                             strq->last_msg_incomplete);
7171                         strq->last_msg_incomplete = 0;
7172                 }
7173                 to_move = 0;
7174                 if (send_lock_up) {
7175                         SCTP_TCB_SEND_UNLOCK(stcb);
7176                         send_lock_up = 0;
7177                 }
7178                 goto out_of;
7179         }
7180         if ((sp->msg_is_complete) && (sp->length == 0)) {
7181                 if (sp->sender_all_done) {
7182                         /*
7183                          * We are doing differed cleanup. Last time through
7184                          * when we took all the data the sender_all_done was
7185                          * not set.
7186                          */
7187                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7188                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7189                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7190                                     sp->sender_all_done,
7191                                     sp->length,
7192                                     sp->msg_is_complete,
7193                                     sp->put_last_out,
7194                                     send_lock_up);
7195                         }
7196                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7197                                 SCTP_TCB_SEND_LOCK(stcb);
7198                                 send_lock_up = 1;
7199                         }
7200                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7201                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7202                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7203                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7204                             (strq->chunks_on_queues == 0) &&
7205                             TAILQ_EMPTY(&strq->outqueue)) {
7206                                 stcb->asoc.trigger_reset = 1;
7207                         }
7208                         if (sp->net) {
7209                                 sctp_free_remote_addr(sp->net);
7210                                 sp->net = NULL;
7211                         }
7212                         if (sp->data) {
7213                                 sctp_m_freem(sp->data);
7214                                 sp->data = NULL;
7215                         }
7216                         sctp_free_a_strmoq(stcb, sp, so_locked);
7217                         /* we can't be locked to it */
7218                         if (send_lock_up) {
7219                                 SCTP_TCB_SEND_UNLOCK(stcb);
7220                                 send_lock_up = 0;
7221                         }
7222                         /* back to get the next msg */
7223                         goto one_more_time;
7224                 } else {
7225                         /*
7226                          * sender just finished this but still holds a
7227                          * reference
7228                          */
7229                         *giveup = 1;
7230                         to_move = 0;
7231                         goto out_of;
7232                 }
7233         } else {
7234                 /* is there some to get */
7235                 if (sp->length == 0) {
7236                         /* no */
7237                         *giveup = 1;
7238                         to_move = 0;
7239                         goto out_of;
7240                 } else if (sp->discard_rest) {
7241                         if (send_lock_up == 0) {
7242                                 SCTP_TCB_SEND_LOCK(stcb);
7243                                 send_lock_up = 1;
7244                         }
7245                         /* Whack down the size */
7246                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7247                         if ((stcb->sctp_socket != NULL) &&
7248                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7249                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7250                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7251                         }
7252                         if (sp->data) {
7253                                 sctp_m_freem(sp->data);
7254                                 sp->data = NULL;
7255                                 sp->tail_mbuf = NULL;
7256                         }
7257                         sp->length = 0;
7258                         sp->some_taken = 1;
7259                         *giveup = 1;
7260                         to_move = 0;
7261                         goto out_of;
7262                 }
7263         }
7264         some_taken = sp->some_taken;
7265 re_look:
7266         length = sp->length;
7267         if (sp->msg_is_complete) {
7268                 /* The message is complete */
7269                 to_move = min(length, frag_point);
7270                 if (to_move == length) {
7271                         /* All of it fits in the MTU */
7272                         if (sp->some_taken) {
7273                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7274                         } else {
7275                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7276                         }
7277                         sp->put_last_out = 1;
7278                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7279                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7280                         }
7281                 } else {
7282                         /* Not all of it fits, we fragment */
7283                         if (sp->some_taken == 0) {
7284                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7285                         }
7286                         sp->some_taken = 1;
7287                 }
7288         } else {
7289                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7290                 if (to_move) {
7291                         /*-
7292                          * We use a snapshot of length in case it
7293                          * is expanding during the compare.
7294                          */
7295                         uint32_t llen;
7296
7297                         llen = length;
7298                         if (to_move >= llen) {
7299                                 to_move = llen;
7300                                 if (send_lock_up == 0) {
7301                                         /*-
7302                                          * We are taking all of an incomplete msg
7303                                          * thus we need a send lock.
7304                                          */
7305                                         SCTP_TCB_SEND_LOCK(stcb);
7306                                         send_lock_up = 1;
7307                                         if (sp->msg_is_complete) {
7308                                                 /*
7309                                                  * the sender finished the
7310                                                  * msg
7311                                                  */
7312                                                 goto re_look;
7313                                         }
7314                                 }
7315                         }
7316                         if (sp->some_taken == 0) {
7317                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7318                                 sp->some_taken = 1;
7319                         }
7320                 } else {
7321                         /* Nothing to take. */
7322                         *giveup = 1;
7323                         to_move = 0;
7324                         goto out_of;
7325                 }
7326         }
7327
7328         /* If we reach here, we can copy out a chunk */
7329         sctp_alloc_a_chunk(stcb, chk);
7330         if (chk == NULL) {
7331                 /* No chunk memory */
7332                 *giveup = 1;
7333                 to_move = 0;
7334                 goto out_of;
7335         }
7336         /*
7337          * Setup for unordered if needed by looking at the user sent info
7338          * flags.
7339          */
7340         if (sp->sinfo_flags & SCTP_UNORDERED) {
7341                 rcv_flags |= SCTP_DATA_UNORDERED;
7342         }
7343         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7344             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7345                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7346         }
7347         /* clear out the chunk before setting up */
7348         memset(chk, 0, sizeof(*chk));
7349         chk->rec.data.rcv_flags = rcv_flags;
7350
7351         if (to_move >= length) {
7352                 /* we think we can steal the whole thing */
7353                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7354                         SCTP_TCB_SEND_LOCK(stcb);
7355                         send_lock_up = 1;
7356                 }
7357                 if (to_move < sp->length) {
7358                         /* bail, it changed */
7359                         goto dont_do_it;
7360                 }
7361                 chk->data = sp->data;
7362                 chk->last_mbuf = sp->tail_mbuf;
7363                 /* register the stealing */
7364                 sp->data = sp->tail_mbuf = NULL;
7365         } else {
7366                 struct mbuf *m;
7367
7368 dont_do_it:
7369                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7370                 chk->last_mbuf = NULL;
7371                 if (chk->data == NULL) {
7372                         sp->some_taken = some_taken;
7373                         sctp_free_a_chunk(stcb, chk, so_locked);
7374                         *bail = 1;
7375                         to_move = 0;
7376                         goto out_of;
7377                 }
7378 #ifdef SCTP_MBUF_LOGGING
7379                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7380                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7381                 }
7382 #endif
7383                 /* Pull off the data */
7384                 m_adj(sp->data, to_move);
7385                 /* Now lets work our way down and compact it */
7386                 m = sp->data;
7387                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7388                         sp->data = SCTP_BUF_NEXT(m);
7389                         SCTP_BUF_NEXT(m) = NULL;
7390                         if (sp->tail_mbuf == m) {
7391                                 /*-
7392                                  * Freeing tail? TSNH since
7393                                  * we supposedly were taking less
7394                                  * than the sp->length.
7395                                  */
7396 #ifdef INVARIANTS
7397                                 panic("Huh, freing tail? - TSNH");
7398 #else
7399                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7400                                 sp->tail_mbuf = sp->data = NULL;
7401                                 sp->length = 0;
7402 #endif
7403
7404                         }
7405                         sctp_m_free(m);
7406                         m = sp->data;
7407                 }
7408         }
7409         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7410                 chk->copy_by_ref = 1;
7411         } else {
7412                 chk->copy_by_ref = 0;
7413         }
7414         /*
7415          * get last_mbuf and counts of mb usage This is ugly but hopefully
7416          * its only one mbuf.
7417          */
7418         if (chk->last_mbuf == NULL) {
7419                 chk->last_mbuf = chk->data;
7420                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7421                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7422                 }
7423         }
7424         if (to_move > length) {
7425                 /*- This should not happen either
7426                  * since we always lower to_move to the size
7427                  * of sp->length if its larger.
7428                  */
7429 #ifdef INVARIANTS
7430                 panic("Huh, how can to_move be larger?");
7431 #else
7432                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7433                 sp->length = 0;
7434 #endif
7435         } else {
7436                 atomic_subtract_int(&sp->length, to_move);
7437         }
7438         if (stcb->asoc.idata_supported == 0) {
7439                 leading = sizeof(struct sctp_data_chunk);
7440         } else {
7441                 leading = sizeof(struct sctp_idata_chunk);
7442         }
7443         if (M_LEADINGSPACE(chk->data) < leading) {
7444                 /* Not enough room for a chunk header, get some */
7445                 struct mbuf *m;
7446
7447                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7448                 if (m == NULL) {
7449                         /*
7450                          * we're in trouble here. _PREPEND below will free
7451                          * all the data if there is no leading space, so we
7452                          * must put the data back and restore.
7453                          */
7454                         if (send_lock_up == 0) {
7455                                 SCTP_TCB_SEND_LOCK(stcb);
7456                                 send_lock_up = 1;
7457                         }
7458                         if (sp->data == NULL) {
7459                                 /* unsteal the data */
7460                                 sp->data = chk->data;
7461                                 sp->tail_mbuf = chk->last_mbuf;
7462                         } else {
7463                                 struct mbuf *m_tmp;
7464
7465                                 /* reassemble the data */
7466                                 m_tmp = sp->data;
7467                                 sp->data = chk->data;
7468                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7469                         }
7470                         sp->some_taken = some_taken;
7471                         atomic_add_int(&sp->length, to_move);
7472                         chk->data = NULL;
7473                         *bail = 1;
7474                         sctp_free_a_chunk(stcb, chk, so_locked);
7475                         to_move = 0;
7476                         goto out_of;
7477                 } else {
7478                         SCTP_BUF_LEN(m) = 0;
7479                         SCTP_BUF_NEXT(m) = chk->data;
7480                         chk->data = m;
7481                         M_ALIGN(chk->data, 4);
7482                 }
7483         }
7484         if (stcb->asoc.idata_supported == 0) {
7485                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7486         } else {
7487                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
7488         }
7489         if (chk->data == NULL) {
7490                 /* HELP, TSNH since we assured it would not above? */
7491 #ifdef INVARIANTS
7492                 panic("prepend failes HELP?");
7493 #else
7494                 SCTP_PRINTF("prepend fails HELP?\n");
7495                 sctp_free_a_chunk(stcb, chk, so_locked);
7496 #endif
7497                 *bail = 1;
7498                 to_move = 0;
7499                 goto out_of;
7500         }
7501         if (stcb->asoc.idata_supported == 0) {
7502                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7503                 chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_data_chunk));
7504         } else {
7505                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
7506                 chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_idata_chunk));
7507         }
7508         chk->book_size_scale = 0;
7509         chk->sent = SCTP_DATAGRAM_UNSENT;
7510
7511         chk->flags = 0;
7512         chk->asoc = &stcb->asoc;
7513         chk->pad_inplace = 0;
7514         chk->no_fr_allowed = 0;
7515         if (stcb->asoc.idata_supported == 0) {
7516                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7517                         /* Just use 0. The receiver ignores the values. */
7518                         chk->rec.data.mid = 0;
7519                 } else {
7520                         chk->rec.data.mid = strq->next_mid_ordered;
7521                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7522                                 strq->next_mid_ordered++;
7523                         }
7524                 }
7525         } else {
7526                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7527                         chk->rec.data.mid = strq->next_mid_unordered;
7528                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7529                                 strq->next_mid_unordered++;
7530                         }
7531                 } else {
7532                         chk->rec.data.mid = strq->next_mid_ordered;
7533                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7534                                 strq->next_mid_ordered++;
7535                         }
7536                 }
7537         }
7538         chk->rec.data.sid = sp->sid;
7539         chk->rec.data.ppid = sp->ppid;
7540         chk->rec.data.context = sp->context;
7541         chk->rec.data.doing_fast_retransmit = 0;
7542
7543         chk->rec.data.timetodrop = sp->ts;
7544         chk->flags = sp->act_flags;
7545
7546         if (sp->net) {
7547                 chk->whoTo = sp->net;
7548                 atomic_add_int(&chk->whoTo->ref_count, 1);
7549         } else
7550                 chk->whoTo = NULL;
7551
7552         if (sp->holds_key_ref) {
7553                 chk->auth_keyid = sp->auth_keyid;
7554                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7555                 chk->holds_key_ref = 1;
7556         }
7557         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7558         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7559                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7560                     (uint32_t)(uintptr_t)stcb, sp->length,
7561                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7562                     chk->rec.data.tsn);
7563         }
7564         if (stcb->asoc.idata_supported == 0) {
7565                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7566         } else {
7567                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7568         }
7569         /*
7570          * Put the rest of the things in place now. Size was done earlier in
7571          * previous loop prior to padding.
7572          */
7573
7574 #ifdef SCTP_ASOCLOG_OF_TSNS
7575         SCTP_TCB_LOCK_ASSERT(stcb);
7576         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7577                 asoc->tsn_out_at = 0;
7578                 asoc->tsn_out_wrapped = 1;
7579         }
7580         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7581         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7582         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7583         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7584         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7585         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7586         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7587         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7588         asoc->tsn_out_at++;
7589 #endif
7590         if (stcb->asoc.idata_supported == 0) {
7591                 dchkh->ch.chunk_type = SCTP_DATA;
7592                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7593                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7594                 dchkh->dp.sid = htons(strq->sid);
7595                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7596                 dchkh->dp.ppid = chk->rec.data.ppid;
7597                 dchkh->ch.chunk_length = htons(chk->send_size);
7598         } else {
7599                 ndchkh->ch.chunk_type = SCTP_IDATA;
7600                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7601                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7602                 ndchkh->dp.sid = htons(strq->sid);
7603                 ndchkh->dp.reserved = htons(0);
7604                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7605                 if (sp->fsn == 0)
7606                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7607                 else
7608                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7609                 sp->fsn++;
7610                 ndchkh->ch.chunk_length = htons(chk->send_size);
7611         }
7612         /* Now advance the chk->send_size by the actual pad needed. */
7613         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7614                 /* need a pad */
7615                 struct mbuf *lm;
7616                 int pads;
7617
7618                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7619                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7620                 if (lm != NULL) {
7621                         chk->last_mbuf = lm;
7622                         chk->pad_inplace = 1;
7623                 }
7624                 chk->send_size += pads;
7625         }
7626         if (PR_SCTP_ENABLED(chk->flags)) {
7627                 asoc->pr_sctp_cnt++;
7628         }
7629         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7630                 /* All done pull and kill the message */
7631                 if (sp->put_last_out == 0) {
7632                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7633                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7634                             sp->sender_all_done,
7635                             sp->length,
7636                             sp->msg_is_complete,
7637                             sp->put_last_out,
7638                             send_lock_up);
7639                 }
7640                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7641                         SCTP_TCB_SEND_LOCK(stcb);
7642                         send_lock_up = 1;
7643                 }
7644                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7645                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7646                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7647                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7648                     (strq->chunks_on_queues == 0) &&
7649                     TAILQ_EMPTY(&strq->outqueue)) {
7650                         stcb->asoc.trigger_reset = 1;
7651                 }
7652                 if (sp->net) {
7653                         sctp_free_remote_addr(sp->net);
7654                         sp->net = NULL;
7655                 }
7656                 if (sp->data) {
7657                         sctp_m_freem(sp->data);
7658                         sp->data = NULL;
7659                 }
7660                 sctp_free_a_strmoq(stcb, sp, so_locked);
7661         }
7662         asoc->chunks_on_out_queue++;
7663         strq->chunks_on_queues++;
7664         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7665         asoc->send_queue_cnt++;
7666 out_of:
7667         if (send_lock_up) {
7668                 SCTP_TCB_SEND_UNLOCK(stcb);
7669         }
7670         return (to_move);
7671 }
7672
7673
7674 static void
7675 sctp_fill_outqueue(struct sctp_tcb *stcb,
7676     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7677 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7678     SCTP_UNUSED
7679 #endif
7680 )
7681 {
7682         struct sctp_association *asoc;
7683         struct sctp_stream_out *strq;
7684         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7685         int giveup;
7686
7687         SCTP_TCB_LOCK_ASSERT(stcb);
7688         asoc = &stcb->asoc;
7689         switch (net->ro._l_addr.sa.sa_family) {
7690 #ifdef INET
7691         case AF_INET:
7692                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7693                 break;
7694 #endif
7695 #ifdef INET6
7696         case AF_INET6:
7697                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7698                 break;
7699 #endif
7700         default:
7701                 /* TSNH */
7702                 goal_mtu = net->mtu;
7703                 break;
7704         }
7705         /* Need an allowance for the data chunk header too */
7706         if (stcb->asoc.idata_supported == 0) {
7707                 goal_mtu -= sizeof(struct sctp_data_chunk);
7708         } else {
7709                 goal_mtu -= sizeof(struct sctp_idata_chunk);
7710         }
7711
7712         /* must make even word boundary */
7713         goal_mtu &= 0xfffffffc;
7714         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7715         while ((goal_mtu > 0) && strq) {
7716                 giveup = 0;
7717                 bail = 0;
7718                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point,
7719                     &giveup, eeor_mode, &bail, so_locked);
7720                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7721
7722                 if ((giveup) || bail) {
7723                         break;
7724                 }
7725                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7726                 if (strq == NULL) {
7727                         break;
7728                 }
7729                 total_moved += moved_how_much;
7730                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7731                 goal_mtu &= 0xfffffffc;
7732         }
7733         if (bail)
7734                 *quit_now = 1;
7735
7736         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7737
7738         if (total_moved == 0) {
7739                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7740                     (net == stcb->asoc.primary_destination)) {
7741                         /* ran dry for primary network net */
7742                         SCTP_STAT_INCR(sctps_primary_randry);
7743                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7744                         /* ran dry with CMT on */
7745                         SCTP_STAT_INCR(sctps_cmt_randry);
7746                 }
7747         }
7748 }
7749
7750 void
7751 sctp_fix_ecn_echo(struct sctp_association *asoc)
7752 {
7753         struct sctp_tmit_chunk *chk;
7754
7755         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7756                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7757                         chk->sent = SCTP_DATAGRAM_UNSENT;
7758                 }
7759         }
7760 }
7761
7762 void
7763 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7764 {
7765         struct sctp_association *asoc;
7766         struct sctp_tmit_chunk *chk;
7767         struct sctp_stream_queue_pending *sp;
7768         unsigned int i;
7769
7770         if (net == NULL) {
7771                 return;
7772         }
7773         asoc = &stcb->asoc;
7774         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7775                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7776                         if (sp->net == net) {
7777                                 sctp_free_remote_addr(sp->net);
7778                                 sp->net = NULL;
7779                         }
7780                 }
7781         }
7782         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7783                 if (chk->whoTo == net) {
7784                         sctp_free_remote_addr(chk->whoTo);
7785                         chk->whoTo = NULL;
7786                 }
7787         }
7788 }
7789
7790 int
7791 sctp_med_chunk_output(struct sctp_inpcb *inp,
7792     struct sctp_tcb *stcb,
7793     struct sctp_association *asoc,
7794     int *num_out,
7795     int *reason_code,
7796     int control_only, int from_where,
7797     struct timeval *now, int *now_filled, int frag_point, int so_locked
7798 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7799     SCTP_UNUSED
7800 #endif
7801 )
7802 {
7803         /**
7804          * Ok this is the generic chunk service queue. we must do the
7805          * following:
7806          * - Service the stream queue that is next, moving any
7807          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7808          *   LAST to the out queue in one pass) and assigning TSN's. This
7809          *   only applys though if the peer does not support NDATA. For NDATA
7810          *   chunks its ok to not send the entire message ;-)
7811          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7812          *   fomulate and send the low level chunks. Making sure to combine
7813          *   any control in the control chunk queue also.
7814          */
7815         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7816         struct mbuf *outchain, *endoutchain;
7817         struct sctp_tmit_chunk *chk, *nchk;
7818
7819         /* temp arrays for unlinking */
7820         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7821         int no_fragmentflg, error;
7822         unsigned int max_rwnd_per_dest, max_send_per_dest;
7823         int one_chunk, hbflag, skip_data_for_this_net;
7824         int asconf, cookie, no_out_cnt;
7825         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7826         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7827         int tsns_sent = 0;
7828         uint32_t auth_offset = 0;
7829         struct sctp_auth_chunk *auth = NULL;
7830         uint16_t auth_keyid;
7831         int override_ok = 1;
7832         int skip_fill_up = 0;
7833         int data_auth_reqd = 0;
7834
7835         /*
7836          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7837          * destination.
7838          */
7839         int quit_now = 0;
7840
7841         *num_out = 0;
7842         *reason_code = 0;
7843         auth_keyid = stcb->asoc.authinfo.active_keyid;
7844         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7845             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7846             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7847                 eeor_mode = 1;
7848         } else {
7849                 eeor_mode = 0;
7850         }
7851         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7852         /*
7853          * First lets prime the pump. For each destination, if there is room
7854          * in the flight size, attempt to pull an MTU's worth out of the
7855          * stream queues into the general send_queue
7856          */
7857 #ifdef SCTP_AUDITING_ENABLED
7858         sctp_audit_log(0xC2, 2);
7859 #endif
7860         SCTP_TCB_LOCK_ASSERT(stcb);
7861         hbflag = 0;
7862         if (control_only)
7863                 no_data_chunks = 1;
7864         else
7865                 no_data_chunks = 0;
7866
7867         /* Nothing to possible to send? */
7868         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7869             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7870             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7871             TAILQ_EMPTY(&asoc->send_queue) &&
7872             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7873 nothing_to_send:
7874                 *reason_code = 9;
7875                 return (0);
7876         }
7877         if (asoc->peers_rwnd == 0) {
7878                 /* No room in peers rwnd */
7879                 *reason_code = 1;
7880                 if (asoc->total_flight > 0) {
7881                         /* we are allowed one chunk in flight */
7882                         no_data_chunks = 1;
7883                 }
7884         }
7885         if (stcb->asoc.ecn_echo_cnt_onq) {
7886                 /* Record where a sack goes, if any */
7887                 if (no_data_chunks &&
7888                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7889                         /* Nothing but ECNe to send - we don't do that */
7890                         goto nothing_to_send;
7891                 }
7892                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7893                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7894                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7895                                 sack_goes_to = chk->whoTo;
7896                                 break;
7897                         }
7898                 }
7899         }
7900         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7901         if (stcb->sctp_socket)
7902                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7903         else
7904                 max_send_per_dest = 0;
7905         if (no_data_chunks == 0) {
7906                 /* How many non-directed chunks are there? */
7907                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7908                         if (chk->whoTo == NULL) {
7909                                 /*
7910                                  * We already have non-directed chunks on
7911                                  * the queue, no need to do a fill-up.
7912                                  */
7913                                 skip_fill_up = 1;
7914                                 break;
7915                         }
7916                 }
7917
7918         }
7919         if ((no_data_chunks == 0) &&
7920             (skip_fill_up == 0) &&
7921             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7922                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7923                         /*
7924                          * This for loop we are in takes in each net, if
7925                          * its's got space in cwnd and has data sent to it
7926                          * (when CMT is off) then it calls
7927                          * sctp_fill_outqueue for the net. This gets data on
7928                          * the send queue for that network.
7929                          *
7930                          * In sctp_fill_outqueue TSN's are assigned and data
7931                          * is copied out of the stream buffers. Note mostly
7932                          * copy by reference (we hope).
7933                          */
7934                         net->window_probe = 0;
7935                         if ((net != stcb->asoc.alternate) &&
7936                             ((net->dest_state & SCTP_ADDR_PF) ||
7937                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7938                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7939                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7940                                         sctp_log_cwnd(stcb, net, 1,
7941                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7942                                 }
7943                                 continue;
7944                         }
7945                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7946                             (net->flight_size == 0)) {
7947                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7948                         }
7949                         if (net->flight_size >= net->cwnd) {
7950                                 /* skip this network, no room - can't fill */
7951                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7952                                         sctp_log_cwnd(stcb, net, 3,
7953                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7954                                 }
7955                                 continue;
7956                         }
7957                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7958                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7959                         }
7960                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7961                         if (quit_now) {
7962                                 /* memory alloc failure */
7963                                 no_data_chunks = 1;
7964                                 break;
7965                         }
7966                 }
7967         }
7968         /* now service each destination and send out what we can for it */
7969         /* Nothing to send? */
7970         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7971             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7972             TAILQ_EMPTY(&asoc->send_queue)) {
7973                 *reason_code = 8;
7974                 return (0);
7975         }
7976         if (asoc->sctp_cmt_on_off > 0) {
7977                 /* get the last start point */
7978                 start_at = asoc->last_net_cmt_send_started;
7979                 if (start_at == NULL) {
7980                         /* null so to beginning */
7981                         start_at = TAILQ_FIRST(&asoc->nets);
7982                 } else {
7983                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7984                         if (start_at == NULL) {
7985                                 start_at = TAILQ_FIRST(&asoc->nets);
7986                         }
7987                 }
7988                 asoc->last_net_cmt_send_started = start_at;
7989         } else {
7990                 start_at = TAILQ_FIRST(&asoc->nets);
7991         }
7992         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7993                 if (chk->whoTo == NULL) {
7994                         if (asoc->alternate) {
7995                                 chk->whoTo = asoc->alternate;
7996                         } else {
7997                                 chk->whoTo = asoc->primary_destination;
7998                         }
7999                         atomic_add_int(&chk->whoTo->ref_count, 1);
8000                 }
8001         }
8002         old_start_at = NULL;
8003 again_one_more_time:
8004         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8005                 /* how much can we send? */
8006                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8007                 if (old_start_at && (old_start_at == net)) {
8008                         /* through list ocmpletely. */
8009                         break;
8010                 }
8011                 tsns_sent = 0xa;
8012                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8013                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8014                     (net->flight_size >= net->cwnd)) {
8015                         /*
8016                          * Nothing on control or asconf and flight is full,
8017                          * we can skip even in the CMT case.
8018                          */
8019                         continue;
8020                 }
8021                 bundle_at = 0;
8022                 endoutchain = outchain = NULL;
8023                 no_fragmentflg = 1;
8024                 one_chunk = 0;
8025                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8026                         skip_data_for_this_net = 1;
8027                 } else {
8028                         skip_data_for_this_net = 0;
8029                 }
8030                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8031 #ifdef INET
8032                 case AF_INET:
8033                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8034                         break;
8035 #endif
8036 #ifdef INET6
8037                 case AF_INET6:
8038                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8039                         break;
8040 #endif
8041                 default:
8042                         /* TSNH */
8043                         mtu = net->mtu;
8044                         break;
8045                 }
8046                 mx_mtu = mtu;
8047                 to_out = 0;
8048                 if (mtu > asoc->peers_rwnd) {
8049                         if (asoc->total_flight > 0) {
8050                                 /* We have a packet in flight somewhere */
8051                                 r_mtu = asoc->peers_rwnd;
8052                         } else {
8053                                 /* We are always allowed to send one MTU out */
8054                                 one_chunk = 1;
8055                                 r_mtu = mtu;
8056                         }
8057                 } else {
8058                         r_mtu = mtu;
8059                 }
8060                 error = 0;
8061                 /************************/
8062                 /* ASCONF transmission */
8063                 /************************/
8064                 /* Now first lets go through the asconf queue */
8065                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8066                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8067                                 continue;
8068                         }
8069                         if (chk->whoTo == NULL) {
8070                                 if (asoc->alternate == NULL) {
8071                                         if (asoc->primary_destination != net) {
8072                                                 break;
8073                                         }
8074                                 } else {
8075                                         if (asoc->alternate != net) {
8076                                                 break;
8077                                         }
8078                                 }
8079                         } else {
8080                                 if (chk->whoTo != net) {
8081                                         break;
8082                                 }
8083                         }
8084                         if (chk->data == NULL) {
8085                                 break;
8086                         }
8087                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8088                             chk->sent != SCTP_DATAGRAM_RESEND) {
8089                                 break;
8090                         }
8091                         /*
8092                          * if no AUTH is yet included and this chunk
8093                          * requires it, make sure to account for it.  We
8094                          * don't apply the size until the AUTH chunk is
8095                          * actually added below in case there is no room for
8096                          * this chunk. NOTE: we overload the use of "omtu"
8097                          * here
8098                          */
8099                         if ((auth == NULL) &&
8100                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8101                             stcb->asoc.peer_auth_chunks)) {
8102                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8103                         } else
8104                                 omtu = 0;
8105                         /* Here we do NOT factor the r_mtu */
8106                         if ((chk->send_size < (int)(mtu - omtu)) ||
8107                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8108                                 /*
8109                                  * We probably should glom the mbuf chain
8110                                  * from the chk->data for control but the
8111                                  * problem is it becomes yet one more level
8112                                  * of tracking to do if for some reason
8113                                  * output fails. Then I have got to
8114                                  * reconstruct the merged control chain.. el
8115                                  * yucko.. for now we take the easy way and
8116                                  * do the copy
8117                                  */
8118                                 /*
8119                                  * Add an AUTH chunk, if chunk requires it
8120                                  * save the offset into the chain for AUTH
8121                                  */
8122                                 if ((auth == NULL) &&
8123                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8124                                     stcb->asoc.peer_auth_chunks))) {
8125                                         outchain = sctp_add_auth_chunk(outchain,
8126                                             &endoutchain,
8127                                             &auth,
8128                                             &auth_offset,
8129                                             stcb,
8130                                             chk->rec.chunk_id.id);
8131                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8132                                 }
8133                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8134                                     (int)chk->rec.chunk_id.can_take_data,
8135                                     chk->send_size, chk->copy_by_ref);
8136                                 if (outchain == NULL) {
8137                                         *reason_code = 8;
8138                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8139                                         return (ENOMEM);
8140                                 }
8141                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8142                                 /* update our MTU size */
8143                                 if (mtu > (chk->send_size + omtu))
8144                                         mtu -= (chk->send_size + omtu);
8145                                 else
8146                                         mtu = 0;
8147                                 to_out += (chk->send_size + omtu);
8148                                 /* Do clear IP_DF ? */
8149                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8150                                         no_fragmentflg = 0;
8151                                 }
8152                                 if (chk->rec.chunk_id.can_take_data)
8153                                         chk->data = NULL;
8154                                 /*
8155                                  * set hb flag since we can use these for
8156                                  * RTO
8157                                  */
8158                                 hbflag = 1;
8159                                 asconf = 1;
8160                                 /*
8161                                  * should sysctl this: don't bundle data
8162                                  * with ASCONF since it requires AUTH
8163                                  */
8164                                 no_data_chunks = 1;
8165                                 chk->sent = SCTP_DATAGRAM_SENT;
8166                                 if (chk->whoTo == NULL) {
8167                                         chk->whoTo = net;
8168                                         atomic_add_int(&net->ref_count, 1);
8169                                 }
8170                                 chk->snd_count++;
8171                                 if (mtu == 0) {
8172                                         /*
8173                                          * Ok we are out of room but we can
8174                                          * output without effecting the
8175                                          * flight size since this little guy
8176                                          * is a control only packet.
8177                                          */
8178                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8179                                         /*
8180                                          * do NOT clear the asconf flag as
8181                                          * it is used to do appropriate
8182                                          * source address selection.
8183                                          */
8184                                         if (*now_filled == 0) {
8185                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8186                                                 *now_filled = 1;
8187                                         }
8188                                         net->last_sent_time = *now;
8189                                         hbflag = 0;
8190                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8191                                             (struct sockaddr *)&net->ro._l_addr,
8192                                             outchain, auth_offset, auth,
8193                                             stcb->asoc.authinfo.active_keyid,
8194                                             no_fragmentflg, 0, asconf,
8195                                             inp->sctp_lport, stcb->rport,
8196                                             htonl(stcb->asoc.peer_vtag),
8197                                             net->port, NULL,
8198                                             0, 0,
8199                                             so_locked))) {
8200                                                 /*
8201                                                  * error, we could not
8202                                                  * output
8203                                                  */
8204                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8205                                                 if (from_where == 0) {
8206                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8207                                                 }
8208                                                 if (error == ENOBUFS) {
8209                                                         asoc->ifp_had_enobuf = 1;
8210                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8211                                                 }
8212                                                 /* error, could not output */
8213                                                 if (error == EHOSTUNREACH) {
8214                                                         /*
8215                                                          * Destination went
8216                                                          * unreachable
8217                                                          * during this send
8218                                                          */
8219                                                         sctp_move_chunks_from_net(stcb, net);
8220                                                 }
8221                                                 *reason_code = 7;
8222                                                 break;
8223                                         } else {
8224                                                 asoc->ifp_had_enobuf = 0;
8225                                         }
8226                                         /*
8227                                          * increase the number we sent, if a
8228                                          * cookie is sent we don't tell them
8229                                          * any was sent out.
8230                                          */
8231                                         outchain = endoutchain = NULL;
8232                                         auth = NULL;
8233                                         auth_offset = 0;
8234                                         if (!no_out_cnt)
8235                                                 *num_out += ctl_cnt;
8236                                         /* recalc a clean slate and setup */
8237                                         switch (net->ro._l_addr.sa.sa_family) {
8238 #ifdef INET
8239                                         case AF_INET:
8240                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8241                                                 break;
8242 #endif
8243 #ifdef INET6
8244                                         case AF_INET6:
8245                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8246                                                 break;
8247 #endif
8248                                         default:
8249                                                 /* TSNH */
8250                                                 mtu = net->mtu;
8251                                                 break;
8252                                         }
8253                                         to_out = 0;
8254                                         no_fragmentflg = 1;
8255                                 }
8256                         }
8257                 }
8258                 if (error != 0) {
8259                         /* try next net */
8260                         continue;
8261                 }
8262                 /************************/
8263                 /* Control transmission */
8264                 /************************/
8265                 /* Now first lets go through the control queue */
8266                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8267                         if ((sack_goes_to) &&
8268                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8269                             (chk->whoTo != sack_goes_to)) {
8270                                 /*
8271                                  * if we have a sack in queue, and we are
8272                                  * looking at an ecn echo that is NOT queued
8273                                  * to where the sack is going..
8274                                  */
8275                                 if (chk->whoTo == net) {
8276                                         /*
8277                                          * Don't transmit it to where its
8278                                          * going (current net)
8279                                          */
8280                                         continue;
8281                                 } else if (sack_goes_to == net) {
8282                                         /*
8283                                          * But do transmit it to this
8284                                          * address
8285                                          */
8286                                         goto skip_net_check;
8287                                 }
8288                         }
8289                         if (chk->whoTo == NULL) {
8290                                 if (asoc->alternate == NULL) {
8291                                         if (asoc->primary_destination != net) {
8292                                                 continue;
8293                                         }
8294                                 } else {
8295                                         if (asoc->alternate != net) {
8296                                                 continue;
8297                                         }
8298                                 }
8299                         } else {
8300                                 if (chk->whoTo != net) {
8301                                         continue;
8302                                 }
8303                         }
8304         skip_net_check:
8305                         if (chk->data == NULL) {
8306                                 continue;
8307                         }
8308                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8309                                 /*
8310                                  * It must be unsent. Cookies and ASCONF's
8311                                  * hang around but there timers will force
8312                                  * when marked for resend.
8313                                  */
8314                                 continue;
8315                         }
8316                         /*
8317                          * if no AUTH is yet included and this chunk
8318                          * requires it, make sure to account for it.  We
8319                          * don't apply the size until the AUTH chunk is
8320                          * actually added below in case there is no room for
8321                          * this chunk. NOTE: we overload the use of "omtu"
8322                          * here
8323                          */
8324                         if ((auth == NULL) &&
8325                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8326                             stcb->asoc.peer_auth_chunks)) {
8327                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8328                         } else
8329                                 omtu = 0;
8330                         /* Here we do NOT factor the r_mtu */
8331                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8332                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8333                                 /*
8334                                  * We probably should glom the mbuf chain
8335                                  * from the chk->data for control but the
8336                                  * problem is it becomes yet one more level
8337                                  * of tracking to do if for some reason
8338                                  * output fails. Then I have got to
8339                                  * reconstruct the merged control chain.. el
8340                                  * yucko.. for now we take the easy way and
8341                                  * do the copy
8342                                  */
8343                                 /*
8344                                  * Add an AUTH chunk, if chunk requires it
8345                                  * save the offset into the chain for AUTH
8346                                  */
8347                                 if ((auth == NULL) &&
8348                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8349                                     stcb->asoc.peer_auth_chunks))) {
8350                                         outchain = sctp_add_auth_chunk(outchain,
8351                                             &endoutchain,
8352                                             &auth,
8353                                             &auth_offset,
8354                                             stcb,
8355                                             chk->rec.chunk_id.id);
8356                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8357                                 }
8358                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8359                                     (int)chk->rec.chunk_id.can_take_data,
8360                                     chk->send_size, chk->copy_by_ref);
8361                                 if (outchain == NULL) {
8362                                         *reason_code = 8;
8363                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8364                                         return (ENOMEM);
8365                                 }
8366                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8367                                 /* update our MTU size */
8368                                 if (mtu > (chk->send_size + omtu))
8369                                         mtu -= (chk->send_size + omtu);
8370                                 else
8371                                         mtu = 0;
8372                                 to_out += (chk->send_size + omtu);
8373                                 /* Do clear IP_DF ? */
8374                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8375                                         no_fragmentflg = 0;
8376                                 }
8377                                 if (chk->rec.chunk_id.can_take_data)
8378                                         chk->data = NULL;
8379                                 /* Mark things to be removed, if needed */
8380                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8381                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8382                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8383                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8384                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8385                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8386                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8387                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8388                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8389                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8390                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8391                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8392                                                 hbflag = 1;
8393                                         }
8394                                         /* remove these chunks at the end */
8395                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8396                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8397                                                 /* turn off the timer */
8398                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8399                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8400                                                             inp, stcb, net,
8401                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8402                                                 }
8403                                         }
8404                                         ctl_cnt++;
8405                                 } else {
8406                                         /*
8407                                          * Other chunks, since they have
8408                                          * timers running (i.e. COOKIE) we
8409                                          * just "trust" that it gets sent or
8410                                          * retransmitted.
8411                                          */
8412                                         ctl_cnt++;
8413                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8414                                                 cookie = 1;
8415                                                 no_out_cnt = 1;
8416                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8417                                                 /*
8418                                                  * Increment ecne send count
8419                                                  * here this means we may be
8420                                                  * over-zealous in our
8421                                                  * counting if the send
8422                                                  * fails, but its the best
8423                                                  * place to do it (we used
8424                                                  * to do it in the queue of
8425                                                  * the chunk, but that did
8426                                                  * not tell how many times
8427                                                  * it was sent.
8428                                                  */
8429                                                 SCTP_STAT_INCR(sctps_sendecne);
8430                                         }
8431                                         chk->sent = SCTP_DATAGRAM_SENT;
8432                                         if (chk->whoTo == NULL) {
8433                                                 chk->whoTo = net;
8434                                                 atomic_add_int(&net->ref_count, 1);
8435                                         }
8436                                         chk->snd_count++;
8437                                 }
8438                                 if (mtu == 0) {
8439                                         /*
8440                                          * Ok we are out of room but we can
8441                                          * output without effecting the
8442                                          * flight size since this little guy
8443                                          * is a control only packet.
8444                                          */
8445                                         if (asconf) {
8446                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8447                                                 /*
8448                                                  * do NOT clear the asconf
8449                                                  * flag as it is used to do
8450                                                  * appropriate source
8451                                                  * address selection.
8452                                                  */
8453                                         }
8454                                         if (cookie) {
8455                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8456                                                 cookie = 0;
8457                                         }
8458                                         /* Only HB or ASCONF advances time */
8459                                         if (hbflag) {
8460                                                 if (*now_filled == 0) {
8461                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8462                                                         *now_filled = 1;
8463                                                 }
8464                                                 net->last_sent_time = *now;
8465                                                 hbflag = 0;
8466                                         }
8467                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8468                                             (struct sockaddr *)&net->ro._l_addr,
8469                                             outchain,
8470                                             auth_offset, auth,
8471                                             stcb->asoc.authinfo.active_keyid,
8472                                             no_fragmentflg, 0, asconf,
8473                                             inp->sctp_lport, stcb->rport,
8474                                             htonl(stcb->asoc.peer_vtag),
8475                                             net->port, NULL,
8476                                             0, 0,
8477                                             so_locked))) {
8478                                                 /*
8479                                                  * error, we could not
8480                                                  * output
8481                                                  */
8482                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8483                                                 if (from_where == 0) {
8484                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8485                                                 }
8486                                                 if (error == ENOBUFS) {
8487                                                         asoc->ifp_had_enobuf = 1;
8488                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8489                                                 }
8490                                                 if (error == EHOSTUNREACH) {
8491                                                         /*
8492                                                          * Destination went
8493                                                          * unreachable
8494                                                          * during this send
8495                                                          */
8496                                                         sctp_move_chunks_from_net(stcb, net);
8497                                                 }
8498                                                 *reason_code = 7;
8499                                                 break;
8500                                         } else {
8501                                                 asoc->ifp_had_enobuf = 0;
8502                                         }
8503                                         /*
8504                                          * increase the number we sent, if a
8505                                          * cookie is sent we don't tell them
8506                                          * any was sent out.
8507                                          */
8508                                         outchain = endoutchain = NULL;
8509                                         auth = NULL;
8510                                         auth_offset = 0;
8511                                         if (!no_out_cnt)
8512                                                 *num_out += ctl_cnt;
8513                                         /* recalc a clean slate and setup */
8514                                         switch (net->ro._l_addr.sa.sa_family) {
8515 #ifdef INET
8516                                         case AF_INET:
8517                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8518                                                 break;
8519 #endif
8520 #ifdef INET6
8521                                         case AF_INET6:
8522                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8523                                                 break;
8524 #endif
8525                                         default:
8526                                                 /* TSNH */
8527                                                 mtu = net->mtu;
8528                                                 break;
8529                                         }
8530                                         to_out = 0;
8531                                         no_fragmentflg = 1;
8532                                 }
8533                         }
8534                 }
8535                 if (error != 0) {
8536                         /* try next net */
8537                         continue;
8538                 }
8539                 /* JRI: if dest is in PF state, do not send data to it */
8540                 if ((asoc->sctp_cmt_on_off > 0) &&
8541                     (net != stcb->asoc.alternate) &&
8542                     (net->dest_state & SCTP_ADDR_PF)) {
8543                         goto no_data_fill;
8544                 }
8545                 if (net->flight_size >= net->cwnd) {
8546                         goto no_data_fill;
8547                 }
8548                 if ((asoc->sctp_cmt_on_off > 0) &&
8549                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8550                     (net->flight_size > max_rwnd_per_dest)) {
8551                         goto no_data_fill;
8552                 }
8553                 /*
8554                  * We need a specific accounting for the usage of the send
8555                  * buffer. We also need to check the number of messages per
8556                  * net. For now, this is better than nothing and it disabled
8557                  * by default...
8558                  */
8559                 if ((asoc->sctp_cmt_on_off > 0) &&
8560                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8561                     (max_send_per_dest > 0) &&
8562                     (net->flight_size > max_send_per_dest)) {
8563                         goto no_data_fill;
8564                 }
8565                 /*********************/
8566                 /* Data transmission */
8567                 /*********************/
8568                 /*
8569                  * if AUTH for DATA is required and no AUTH has been added
8570                  * yet, account for this in the mtu now... if no data can be
8571                  * bundled, this adjustment won't matter anyways since the
8572                  * packet will be going out...
8573                  */
8574                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8575                     stcb->asoc.peer_auth_chunks);
8576                 if (data_auth_reqd && (auth == NULL)) {
8577                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8578                 }
8579                 /* now lets add any data within the MTU constraints */
8580                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8581 #ifdef INET
8582                 case AF_INET:
8583                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8584                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8585                         else
8586                                 omtu = 0;
8587                         break;
8588 #endif
8589 #ifdef INET6
8590                 case AF_INET6:
8591                         if (net->mtu > SCTP_MIN_OVERHEAD)
8592                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8593                         else
8594                                 omtu = 0;
8595                         break;
8596 #endif
8597                 default:
8598                         /* TSNH */
8599                         omtu = 0;
8600                         break;
8601                 }
8602                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8603                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8604                     (skip_data_for_this_net == 0)) ||
8605                     (cookie)) {
8606                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8607                                 if (no_data_chunks) {
8608                                         /* let only control go out */
8609                                         *reason_code = 1;
8610                                         break;
8611                                 }
8612                                 if (net->flight_size >= net->cwnd) {
8613                                         /* skip this net, no room for data */
8614                                         *reason_code = 2;
8615                                         break;
8616                                 }
8617                                 if ((chk->whoTo != NULL) &&
8618                                     (chk->whoTo != net)) {
8619                                         /* Don't send the chunk on this net */
8620                                         continue;
8621                                 }
8622                                 if (asoc->sctp_cmt_on_off == 0) {
8623                                         if ((asoc->alternate) &&
8624                                             (asoc->alternate != net) &&
8625                                             (chk->whoTo == NULL)) {
8626                                                 continue;
8627                                         } else if ((net != asoc->primary_destination) &&
8628                                                     (asoc->alternate == NULL) &&
8629                                             (chk->whoTo == NULL)) {
8630                                                 continue;
8631                                         }
8632                                 }
8633                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8634                                         /*-
8635                                          * strange, we have a chunk that is
8636                                          * to big for its destination and
8637                                          * yet no fragment ok flag.
8638                                          * Something went wrong when the
8639                                          * PMTU changed...we did not mark
8640                                          * this chunk for some reason?? I
8641                                          * will fix it here by letting IP
8642                                          * fragment it for now and printing
8643                                          * a warning. This really should not
8644                                          * happen ...
8645                                          */
8646                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8647                                             chk->send_size, mtu);
8648                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8649                                 }
8650                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8651                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8652                                         struct sctp_data_chunk *dchkh;
8653
8654                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8655                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8656                                 }
8657                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8658                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8659                                         /* ok we will add this one */
8660
8661                                         /*
8662                                          * Add an AUTH chunk, if chunk
8663                                          * requires it, save the offset into
8664                                          * the chain for AUTH
8665                                          */
8666                                         if (data_auth_reqd) {
8667                                                 if (auth == NULL) {
8668                                                         outchain = sctp_add_auth_chunk(outchain,
8669                                                             &endoutchain,
8670                                                             &auth,
8671                                                             &auth_offset,
8672                                                             stcb,
8673                                                             SCTP_DATA);
8674                                                         auth_keyid = chk->auth_keyid;
8675                                                         override_ok = 0;
8676                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8677                                                 } else if (override_ok) {
8678                                                         /*
8679                                                          * use this data's
8680                                                          * keyid
8681                                                          */
8682                                                         auth_keyid = chk->auth_keyid;
8683                                                         override_ok = 0;
8684                                                 } else if (auth_keyid != chk->auth_keyid) {
8685                                                         /*
8686                                                          * different keyid,
8687                                                          * so done bundling
8688                                                          */
8689                                                         break;
8690                                                 }
8691                                         }
8692                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8693                                             chk->send_size, chk->copy_by_ref);
8694                                         if (outchain == NULL) {
8695                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8696                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8697                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8698                                                 }
8699                                                 *reason_code = 3;
8700                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8701                                                 return (ENOMEM);
8702                                         }
8703                                         /* upate our MTU size */
8704                                         /* Do clear IP_DF ? */
8705                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8706                                                 no_fragmentflg = 0;
8707                                         }
8708                                         /* unsigned subtraction of mtu */
8709                                         if (mtu > chk->send_size)
8710                                                 mtu -= chk->send_size;
8711                                         else
8712                                                 mtu = 0;
8713                                         /* unsigned subtraction of r_mtu */
8714                                         if (r_mtu > chk->send_size)
8715                                                 r_mtu -= chk->send_size;
8716                                         else
8717                                                 r_mtu = 0;
8718
8719                                         to_out += chk->send_size;
8720                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8721 #ifdef INVARIANTS
8722                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8723 #else
8724                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8725                                                     mx_mtu, to_out);
8726 #endif
8727                                         }
8728                                         chk->window_probe = 0;
8729                                         data_list[bundle_at++] = chk;
8730                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8731                                                 break;
8732                                         }
8733                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8734                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8735                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8736                                                 } else {
8737                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8738                                                 }
8739                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8740                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8741                                                         /*
8742                                                          * Count number of
8743                                                          * user msg's that
8744                                                          * were fragmented
8745                                                          * we do this by
8746                                                          * counting when we
8747                                                          * see a LAST
8748                                                          * fragment only.
8749                                                          */
8750                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8751                                         }
8752                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8753                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8754                                                         data_list[0]->window_probe = 1;
8755                                                         net->window_probe = 1;
8756                                                 }
8757                                                 break;
8758                                         }
8759                                 } else {
8760                                         /*
8761                                          * Must be sent in order of the
8762                                          * TSN's (on a network)
8763                                          */
8764                                         break;
8765                                 }
8766                         }       /* for (chunk gather loop for this net) */
8767                 }               /* if asoc.state OPEN */
8768 no_data_fill:
8769                 /* Is there something to send for this destination? */
8770                 if (outchain) {
8771                         /* We may need to start a control timer or two */
8772                         if (asconf) {
8773                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8774                                     stcb, net);
8775                                 /*
8776                                  * do NOT clear the asconf flag as it is
8777                                  * used to do appropriate source address
8778                                  * selection.
8779                                  */
8780                         }
8781                         if (cookie) {
8782                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8783                                 cookie = 0;
8784                         }
8785                         /* must start a send timer if data is being sent */
8786                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8787                                 /*
8788                                  * no timer running on this destination
8789                                  * restart it.
8790                                  */
8791                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8792                         }
8793                         if (bundle_at || hbflag) {
8794                                 /* For data/asconf and hb set time */
8795                                 if (*now_filled == 0) {
8796                                         (void)SCTP_GETTIME_TIMEVAL(now);
8797                                         *now_filled = 1;
8798                                 }
8799                                 net->last_sent_time = *now;
8800                         }
8801                         /* Now send it, if there is anything to send :> */
8802                         if ((error = sctp_lowlevel_chunk_output(inp,
8803                             stcb,
8804                             net,
8805                             (struct sockaddr *)&net->ro._l_addr,
8806                             outchain,
8807                             auth_offset,
8808                             auth,
8809                             auth_keyid,
8810                             no_fragmentflg,
8811                             bundle_at,
8812                             asconf,
8813                             inp->sctp_lport, stcb->rport,
8814                             htonl(stcb->asoc.peer_vtag),
8815                             net->port, NULL,
8816                             0, 0,
8817                             so_locked))) {
8818                                 /* error, we could not output */
8819                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8820                                 if (from_where == 0) {
8821                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8822                                 }
8823                                 if (error == ENOBUFS) {
8824                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8825                                         asoc->ifp_had_enobuf = 1;
8826                                 }
8827                                 if (error == EHOSTUNREACH) {
8828                                         /*
8829                                          * Destination went unreachable
8830                                          * during this send
8831                                          */
8832                                         sctp_move_chunks_from_net(stcb, net);
8833                                 }
8834                                 *reason_code = 6;
8835                                 /*-
8836                                  * I add this line to be paranoid. As far as
8837                                  * I can tell the continue, takes us back to
8838                                  * the top of the for, but just to make sure
8839                                  * I will reset these again here.
8840                                  */
8841                                 ctl_cnt = bundle_at = 0;
8842                                 continue;       /* This takes us back to the
8843                                                  * for() for the nets. */
8844                         } else {
8845                                 asoc->ifp_had_enobuf = 0;
8846                         }
8847                         endoutchain = NULL;
8848                         auth = NULL;
8849                         auth_offset = 0;
8850                         if (!no_out_cnt) {
8851                                 *num_out += (ctl_cnt + bundle_at);
8852                         }
8853                         if (bundle_at) {
8854                                 /* setup for a RTO measurement */
8855                                 tsns_sent = data_list[0]->rec.data.tsn;
8856                                 /* fill time if not already filled */
8857                                 if (*now_filled == 0) {
8858                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8859                                         *now_filled = 1;
8860                                         *now = asoc->time_last_sent;
8861                                 } else {
8862                                         asoc->time_last_sent = *now;
8863                                 }
8864                                 if (net->rto_needed) {
8865                                         data_list[0]->do_rtt = 1;
8866                                         net->rto_needed = 0;
8867                                 }
8868                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8869                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8870                         }
8871                         if (one_chunk) {
8872                                 break;
8873                         }
8874                 }
8875                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8876                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8877                 }
8878         }
8879         if (old_start_at == NULL) {
8880                 old_start_at = start_at;
8881                 start_at = TAILQ_FIRST(&asoc->nets);
8882                 if (old_start_at)
8883                         goto again_one_more_time;
8884         }
8885         /*
8886          * At the end there should be no NON timed chunks hanging on this
8887          * queue.
8888          */
8889         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8890                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8891         }
8892         if ((*num_out == 0) && (*reason_code == 0)) {
8893                 *reason_code = 4;
8894         } else {
8895                 *reason_code = 5;
8896         }
8897         sctp_clean_up_ctl(stcb, asoc, so_locked);
8898         return (0);
8899 }
8900
8901 void
8902 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8903 {
8904         /*-
8905          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8906          * the control chunk queue.
8907          */
8908         struct sctp_chunkhdr *hdr;
8909         struct sctp_tmit_chunk *chk;
8910         struct mbuf *mat, *last_mbuf;
8911         uint32_t chunk_length;
8912         uint16_t padding_length;
8913
8914         SCTP_TCB_LOCK_ASSERT(stcb);
8915         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8916         if (op_err == NULL) {
8917                 return;
8918         }
8919         last_mbuf = NULL;
8920         chunk_length = 0;
8921         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8922                 chunk_length += SCTP_BUF_LEN(mat);
8923                 if (SCTP_BUF_NEXT(mat) == NULL) {
8924                         last_mbuf = mat;
8925                 }
8926         }
8927         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8928                 sctp_m_freem(op_err);
8929                 return;
8930         }
8931         padding_length = chunk_length % 4;
8932         if (padding_length != 0) {
8933                 padding_length = 4 - padding_length;
8934         }
8935         if (padding_length != 0) {
8936                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8937                         sctp_m_freem(op_err);
8938                         return;
8939                 }
8940         }
8941         sctp_alloc_a_chunk(stcb, chk);
8942         if (chk == NULL) {
8943                 /* no memory */
8944                 sctp_m_freem(op_err);
8945                 return;
8946         }
8947         chk->copy_by_ref = 0;
8948         chk->send_size = (uint16_t)chunk_length;
8949         chk->sent = SCTP_DATAGRAM_UNSENT;
8950         chk->snd_count = 0;
8951         chk->asoc = &stcb->asoc;
8952         chk->data = op_err;
8953         chk->whoTo = NULL;
8954         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8955         chk->rec.chunk_id.can_take_data = 0;
8956         hdr = mtod(op_err, struct sctp_chunkhdr *);
8957         hdr->chunk_type = SCTP_OPERATION_ERROR;
8958         hdr->chunk_flags = 0;
8959         hdr->chunk_length = htons(chk->send_size);
8960         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8961         chk->asoc->ctrl_queue_cnt++;
8962 }
8963
8964 int
8965 sctp_send_cookie_echo(struct mbuf *m,
8966     int offset,
8967     struct sctp_tcb *stcb,
8968     struct sctp_nets *net)
8969 {
8970         /*-
8971          * pull out the cookie and put it at the front of the control chunk
8972          * queue.
8973          */
8974         int at;
8975         struct mbuf *cookie;
8976         struct sctp_paramhdr parm, *phdr;
8977         struct sctp_chunkhdr *hdr;
8978         struct sctp_tmit_chunk *chk;
8979         uint16_t ptype, plen;
8980
8981         SCTP_TCB_LOCK_ASSERT(stcb);
8982         /* First find the cookie in the param area */
8983         cookie = NULL;
8984         at = offset + sizeof(struct sctp_init_chunk);
8985         for (;;) {
8986                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8987                 if (phdr == NULL) {
8988                         return (-3);
8989                 }
8990                 ptype = ntohs(phdr->param_type);
8991                 plen = ntohs(phdr->param_length);
8992                 if (ptype == SCTP_STATE_COOKIE) {
8993                         int pad;
8994
8995                         /* found the cookie */
8996                         if ((pad = (plen % 4))) {
8997                                 plen += 4 - pad;
8998                         }
8999                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9000                         if (cookie == NULL) {
9001                                 /* No memory */
9002                                 return (-2);
9003                         }
9004 #ifdef SCTP_MBUF_LOGGING
9005                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9006                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9007                         }
9008 #endif
9009                         break;
9010                 }
9011                 at += SCTP_SIZE32(plen);
9012         }
9013         /* ok, we got the cookie lets change it into a cookie echo chunk */
9014         /* first the change from param to cookie */
9015         hdr = mtod(cookie, struct sctp_chunkhdr *);
9016         hdr->chunk_type = SCTP_COOKIE_ECHO;
9017         hdr->chunk_flags = 0;
9018         /* get the chunk stuff now and place it in the FRONT of the queue */
9019         sctp_alloc_a_chunk(stcb, chk);
9020         if (chk == NULL) {
9021                 /* no memory */
9022                 sctp_m_freem(cookie);
9023                 return (-5);
9024         }
9025         chk->copy_by_ref = 0;
9026         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9027         chk->rec.chunk_id.can_take_data = 0;
9028         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9029         chk->send_size = plen;
9030         chk->sent = SCTP_DATAGRAM_UNSENT;
9031         chk->snd_count = 0;
9032         chk->asoc = &stcb->asoc;
9033         chk->data = cookie;
9034         chk->whoTo = net;
9035         atomic_add_int(&chk->whoTo->ref_count, 1);
9036         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9037         chk->asoc->ctrl_queue_cnt++;
9038         return (0);
9039 }
9040
9041 void
9042 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9043     struct mbuf *m,
9044     int offset,
9045     int chk_length,
9046     struct sctp_nets *net)
9047 {
9048         /*
9049          * take a HB request and make it into a HB ack and send it.
9050          */
9051         struct mbuf *outchain;
9052         struct sctp_chunkhdr *chdr;
9053         struct sctp_tmit_chunk *chk;
9054
9055
9056         if (net == NULL)
9057                 /* must have a net pointer */
9058                 return;
9059
9060         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9061         if (outchain == NULL) {
9062                 /* gak out of memory */
9063                 return;
9064         }
9065 #ifdef SCTP_MBUF_LOGGING
9066         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9067                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9068         }
9069 #endif
9070         chdr = mtod(outchain, struct sctp_chunkhdr *);
9071         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9072         chdr->chunk_flags = 0;
9073         if (chk_length % 4) {
9074                 /* need pad */
9075                 uint32_t cpthis = 0;
9076                 int padlen;
9077
9078                 padlen = 4 - (chk_length % 4);
9079                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9080         }
9081         sctp_alloc_a_chunk(stcb, chk);
9082         if (chk == NULL) {
9083                 /* no memory */
9084                 sctp_m_freem(outchain);
9085                 return;
9086         }
9087         chk->copy_by_ref = 0;
9088         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9089         chk->rec.chunk_id.can_take_data = 1;
9090         chk->flags = 0;
9091         chk->send_size = chk_length;
9092         chk->sent = SCTP_DATAGRAM_UNSENT;
9093         chk->snd_count = 0;
9094         chk->asoc = &stcb->asoc;
9095         chk->data = outchain;
9096         chk->whoTo = net;
9097         atomic_add_int(&chk->whoTo->ref_count, 1);
9098         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9099         chk->asoc->ctrl_queue_cnt++;
9100 }
9101
9102 void
9103 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9104 {
9105         /* formulate and queue a cookie-ack back to sender */
9106         struct mbuf *cookie_ack;
9107         struct sctp_chunkhdr *hdr;
9108         struct sctp_tmit_chunk *chk;
9109
9110         SCTP_TCB_LOCK_ASSERT(stcb);
9111
9112         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9113         if (cookie_ack == NULL) {
9114                 /* no mbuf's */
9115                 return;
9116         }
9117         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9118         sctp_alloc_a_chunk(stcb, chk);
9119         if (chk == NULL) {
9120                 /* no memory */
9121                 sctp_m_freem(cookie_ack);
9122                 return;
9123         }
9124         chk->copy_by_ref = 0;
9125         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9126         chk->rec.chunk_id.can_take_data = 1;
9127         chk->flags = 0;
9128         chk->send_size = sizeof(struct sctp_chunkhdr);
9129         chk->sent = SCTP_DATAGRAM_UNSENT;
9130         chk->snd_count = 0;
9131         chk->asoc = &stcb->asoc;
9132         chk->data = cookie_ack;
9133         if (chk->asoc->last_control_chunk_from != NULL) {
9134                 chk->whoTo = chk->asoc->last_control_chunk_from;
9135                 atomic_add_int(&chk->whoTo->ref_count, 1);
9136         } else {
9137                 chk->whoTo = NULL;
9138         }
9139         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9140         hdr->chunk_type = SCTP_COOKIE_ACK;
9141         hdr->chunk_flags = 0;
9142         hdr->chunk_length = htons(chk->send_size);
9143         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9144         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9145         chk->asoc->ctrl_queue_cnt++;
9146         return;
9147 }
9148
9149
9150 void
9151 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9152 {
9153         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9154         struct mbuf *m_shutdown_ack;
9155         struct sctp_shutdown_ack_chunk *ack_cp;
9156         struct sctp_tmit_chunk *chk;
9157
9158         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9159         if (m_shutdown_ack == NULL) {
9160                 /* no mbuf's */
9161                 return;
9162         }
9163         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9164         sctp_alloc_a_chunk(stcb, chk);
9165         if (chk == NULL) {
9166                 /* no memory */
9167                 sctp_m_freem(m_shutdown_ack);
9168                 return;
9169         }
9170         chk->copy_by_ref = 0;
9171         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9172         chk->rec.chunk_id.can_take_data = 1;
9173         chk->flags = 0;
9174         chk->send_size = sizeof(struct sctp_chunkhdr);
9175         chk->sent = SCTP_DATAGRAM_UNSENT;
9176         chk->snd_count = 0;
9177         chk->flags = 0;
9178         chk->asoc = &stcb->asoc;
9179         chk->data = m_shutdown_ack;
9180         chk->whoTo = net;
9181         if (chk->whoTo) {
9182                 atomic_add_int(&chk->whoTo->ref_count, 1);
9183         }
9184         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9185         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9186         ack_cp->ch.chunk_flags = 0;
9187         ack_cp->ch.chunk_length = htons(chk->send_size);
9188         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9189         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9190         chk->asoc->ctrl_queue_cnt++;
9191         return;
9192 }
9193
9194 void
9195 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9196 {
9197         /* formulate and queue a SHUTDOWN to the sender */
9198         struct mbuf *m_shutdown;
9199         struct sctp_shutdown_chunk *shutdown_cp;
9200         struct sctp_tmit_chunk *chk;
9201
9202         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9203                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9204                         /* We already have a SHUTDOWN queued. Reuse it. */
9205                         if (chk->whoTo) {
9206                                 sctp_free_remote_addr(chk->whoTo);
9207                                 chk->whoTo = NULL;
9208                         }
9209                         break;
9210                 }
9211         }
9212         if (chk == NULL) {
9213                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9214                 if (m_shutdown == NULL) {
9215                         /* no mbuf's */
9216                         return;
9217                 }
9218                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9219                 sctp_alloc_a_chunk(stcb, chk);
9220                 if (chk == NULL) {
9221                         /* no memory */
9222                         sctp_m_freem(m_shutdown);
9223                         return;
9224                 }
9225                 chk->copy_by_ref = 0;
9226                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9227                 chk->rec.chunk_id.can_take_data = 1;
9228                 chk->flags = 0;
9229                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9230                 chk->sent = SCTP_DATAGRAM_UNSENT;
9231                 chk->snd_count = 0;
9232                 chk->flags = 0;
9233                 chk->asoc = &stcb->asoc;
9234                 chk->data = m_shutdown;
9235                 chk->whoTo = net;
9236                 if (chk->whoTo) {
9237                         atomic_add_int(&chk->whoTo->ref_count, 1);
9238                 }
9239                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9240                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9241                 shutdown_cp->ch.chunk_flags = 0;
9242                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9243                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9244                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9245                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9246                 chk->asoc->ctrl_queue_cnt++;
9247         } else {
9248                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9249                 chk->whoTo = net;
9250                 if (chk->whoTo) {
9251                         atomic_add_int(&chk->whoTo->ref_count, 1);
9252                 }
9253                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9254                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9255                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9256         }
9257         return;
9258 }
9259
9260 void
9261 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9262 {
9263         /*
9264          * formulate and queue an ASCONF to the peer. ASCONF parameters
9265          * should be queued on the assoc queue.
9266          */
9267         struct sctp_tmit_chunk *chk;
9268         struct mbuf *m_asconf;
9269         int len;
9270
9271         SCTP_TCB_LOCK_ASSERT(stcb);
9272
9273         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9274             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9275                 /* can't send a new one if there is one in flight already */
9276                 return;
9277         }
9278         /* compose an ASCONF chunk, maximum length is PMTU */
9279         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9280         if (m_asconf == NULL) {
9281                 return;
9282         }
9283         sctp_alloc_a_chunk(stcb, chk);
9284         if (chk == NULL) {
9285                 /* no memory */
9286                 sctp_m_freem(m_asconf);
9287                 return;
9288         }
9289         chk->copy_by_ref = 0;
9290         chk->rec.chunk_id.id = SCTP_ASCONF;
9291         chk->rec.chunk_id.can_take_data = 0;
9292         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9293         chk->data = m_asconf;
9294         chk->send_size = len;
9295         chk->sent = SCTP_DATAGRAM_UNSENT;
9296         chk->snd_count = 0;
9297         chk->asoc = &stcb->asoc;
9298         chk->whoTo = net;
9299         if (chk->whoTo) {
9300                 atomic_add_int(&chk->whoTo->ref_count, 1);
9301         }
9302         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9303         chk->asoc->ctrl_queue_cnt++;
9304         return;
9305 }
9306
9307 void
9308 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9309 {
9310         /*
9311          * formulate and queue a asconf-ack back to sender. the asconf-ack
9312          * must be stored in the tcb.
9313          */
9314         struct sctp_tmit_chunk *chk;
9315         struct sctp_asconf_ack *ack, *latest_ack;
9316         struct mbuf *m_ack;
9317         struct sctp_nets *net = NULL;
9318
9319         SCTP_TCB_LOCK_ASSERT(stcb);
9320         /* Get the latest ASCONF-ACK */
9321         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9322         if (latest_ack == NULL) {
9323                 return;
9324         }
9325         if (latest_ack->last_sent_to != NULL &&
9326             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9327                 /* we're doing a retransmission */
9328                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9329                 if (net == NULL) {
9330                         /* no alternate */
9331                         if (stcb->asoc.last_control_chunk_from == NULL) {
9332                                 if (stcb->asoc.alternate) {
9333                                         net = stcb->asoc.alternate;
9334                                 } else {
9335                                         net = stcb->asoc.primary_destination;
9336                                 }
9337                         } else {
9338                                 net = stcb->asoc.last_control_chunk_from;
9339                         }
9340                 }
9341         } else {
9342                 /* normal case */
9343                 if (stcb->asoc.last_control_chunk_from == NULL) {
9344                         if (stcb->asoc.alternate) {
9345                                 net = stcb->asoc.alternate;
9346                         } else {
9347                                 net = stcb->asoc.primary_destination;
9348                         }
9349                 } else {
9350                         net = stcb->asoc.last_control_chunk_from;
9351                 }
9352         }
9353         latest_ack->last_sent_to = net;
9354
9355         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9356                 if (ack->data == NULL) {
9357                         continue;
9358                 }
9359                 /* copy the asconf_ack */
9360                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9361                 if (m_ack == NULL) {
9362                         /* couldn't copy it */
9363                         return;
9364                 }
9365 #ifdef SCTP_MBUF_LOGGING
9366                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9367                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9368                 }
9369 #endif
9370
9371                 sctp_alloc_a_chunk(stcb, chk);
9372                 if (chk == NULL) {
9373                         /* no memory */
9374                         if (m_ack)
9375                                 sctp_m_freem(m_ack);
9376                         return;
9377                 }
9378                 chk->copy_by_ref = 0;
9379                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9380                 chk->rec.chunk_id.can_take_data = 1;
9381                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9382                 chk->whoTo = net;
9383                 if (chk->whoTo) {
9384                         atomic_add_int(&chk->whoTo->ref_count, 1);
9385                 }
9386                 chk->data = m_ack;
9387                 chk->send_size = ack->len;
9388                 chk->sent = SCTP_DATAGRAM_UNSENT;
9389                 chk->snd_count = 0;
9390                 chk->asoc = &stcb->asoc;
9391
9392                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9393                 chk->asoc->ctrl_queue_cnt++;
9394         }
9395         return;
9396 }
9397
9398
9399 static int
9400 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9401     struct sctp_tcb *stcb,
9402     struct sctp_association *asoc,
9403     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9404 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9405     SCTP_UNUSED
9406 #endif
9407 )
9408 {
9409         /*-
9410          * send out one MTU of retransmission. If fast_retransmit is
9411          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9412          * rwnd. For a Cookie or Asconf in the control chunk queue we
9413          * retransmit them by themselves.
9414          *
9415          * For data chunks we will pick out the lowest TSN's in the sent_queue
9416          * marked for resend and bundle them all together (up to a MTU of
9417          * destination). The address to send to should have been
9418          * selected/changed where the retransmission was marked (i.e. in FR
9419          * or t3-timeout routines).
9420          */
9421         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9422         struct sctp_tmit_chunk *chk, *fwd;
9423         struct mbuf *m, *endofchain;
9424         struct sctp_nets *net = NULL;
9425         uint32_t tsns_sent = 0;
9426         int no_fragmentflg, bundle_at, cnt_thru;
9427         unsigned int mtu;
9428         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9429         struct sctp_auth_chunk *auth = NULL;
9430         uint32_t auth_offset = 0;
9431         uint16_t auth_keyid;
9432         int override_ok = 1;
9433         int data_auth_reqd = 0;
9434         uint32_t dmtu = 0;
9435
9436         SCTP_TCB_LOCK_ASSERT(stcb);
9437         tmr_started = ctl_cnt = bundle_at = error = 0;
9438         no_fragmentflg = 1;
9439         fwd_tsn = 0;
9440         *cnt_out = 0;
9441         fwd = NULL;
9442         endofchain = m = NULL;
9443         auth_keyid = stcb->asoc.authinfo.active_keyid;
9444 #ifdef SCTP_AUDITING_ENABLED
9445         sctp_audit_log(0xC3, 1);
9446 #endif
9447         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9448             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9449                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9450                     asoc->sent_queue_retran_cnt);
9451                 asoc->sent_queue_cnt = 0;
9452                 asoc->sent_queue_cnt_removeable = 0;
9453                 /* send back 0/0 so we enter normal transmission */
9454                 *cnt_out = 0;
9455                 return (0);
9456         }
9457         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9458                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9459                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9460                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9461                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9462                                 continue;
9463                         }
9464                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9465                                 if (chk != asoc->str_reset) {
9466                                         /*
9467                                          * not eligible for retran if its
9468                                          * not ours
9469                                          */
9470                                         continue;
9471                                 }
9472                         }
9473                         ctl_cnt++;
9474                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9475                                 fwd_tsn = 1;
9476                         }
9477                         /*
9478                          * Add an AUTH chunk, if chunk requires it save the
9479                          * offset into the chain for AUTH
9480                          */
9481                         if ((auth == NULL) &&
9482                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9483                             stcb->asoc.peer_auth_chunks))) {
9484                                 m = sctp_add_auth_chunk(m, &endofchain,
9485                                     &auth, &auth_offset,
9486                                     stcb,
9487                                     chk->rec.chunk_id.id);
9488                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9489                         }
9490                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9491                         break;
9492                 }
9493         }
9494         one_chunk = 0;
9495         cnt_thru = 0;
9496         /* do we have control chunks to retransmit? */
9497         if (m != NULL) {
9498                 /* Start a timer no matter if we succeed or fail */
9499                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9500                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9501                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9502                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9503                 chk->snd_count++;       /* update our count */
9504                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9505                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9506                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9507                     no_fragmentflg, 0, 0,
9508                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9509                     chk->whoTo->port, NULL,
9510                     0, 0,
9511                     so_locked))) {
9512                         SCTP_STAT_INCR(sctps_lowlevelerr);
9513                         return (error);
9514                 }
9515                 endofchain = NULL;
9516                 auth = NULL;
9517                 auth_offset = 0;
9518                 /*
9519                  * We don't want to mark the net->sent time here since this
9520                  * we use this for HB and retrans cannot measure RTT
9521                  */
9522                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9523                 *cnt_out += 1;
9524                 chk->sent = SCTP_DATAGRAM_SENT;
9525                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9526                 if (fwd_tsn == 0) {
9527                         return (0);
9528                 } else {
9529                         /* Clean up the fwd-tsn list */
9530                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9531                         return (0);
9532                 }
9533         }
9534         /*
9535          * Ok, it is just data retransmission we need to do or that and a
9536          * fwd-tsn with it all.
9537          */
9538         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9539                 return (SCTP_RETRAN_DONE);
9540         }
9541         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9542             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9543                 /* not yet open, resend the cookie and that is it */
9544                 return (1);
9545         }
9546 #ifdef SCTP_AUDITING_ENABLED
9547         sctp_auditing(20, inp, stcb, NULL);
9548 #endif
9549         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9550         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9551                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9552                         /* No, not sent to this net or not ready for rtx */
9553                         continue;
9554                 }
9555                 if (chk->data == NULL) {
9556                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9557                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9558                         continue;
9559                 }
9560                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9561                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9562                         struct mbuf *op_err;
9563                         char msg[SCTP_DIAG_INFO_LEN];
9564
9565                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9566                             chk->rec.data.tsn, chk->snd_count);
9567                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9568                             msg);
9569                         atomic_add_int(&stcb->asoc.refcnt, 1);
9570                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9571                             so_locked);
9572                         SCTP_TCB_LOCK(stcb);
9573                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9574                         return (SCTP_RETRAN_EXIT);
9575                 }
9576                 /* pick up the net */
9577                 net = chk->whoTo;
9578                 switch (net->ro._l_addr.sa.sa_family) {
9579 #ifdef INET
9580                 case AF_INET:
9581                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9582                         break;
9583 #endif
9584 #ifdef INET6
9585                 case AF_INET6:
9586                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9587                         break;
9588 #endif
9589                 default:
9590                         /* TSNH */
9591                         mtu = net->mtu;
9592                         break;
9593                 }
9594
9595                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9596                         /* No room in peers rwnd */
9597                         uint32_t tsn;
9598
9599                         tsn = asoc->last_acked_seq + 1;
9600                         if (tsn == chk->rec.data.tsn) {
9601                                 /*
9602                                  * we make a special exception for this
9603                                  * case. The peer has no rwnd but is missing
9604                                  * the lowest chunk.. which is probably what
9605                                  * is holding up the rwnd.
9606                                  */
9607                                 goto one_chunk_around;
9608                         }
9609                         return (1);
9610                 }
9611 one_chunk_around:
9612                 if (asoc->peers_rwnd < mtu) {
9613                         one_chunk = 1;
9614                         if ((asoc->peers_rwnd == 0) &&
9615                             (asoc->total_flight == 0)) {
9616                                 chk->window_probe = 1;
9617                                 chk->whoTo->window_probe = 1;
9618                         }
9619                 }
9620 #ifdef SCTP_AUDITING_ENABLED
9621                 sctp_audit_log(0xC3, 2);
9622 #endif
9623                 bundle_at = 0;
9624                 m = NULL;
9625                 net->fast_retran_ip = 0;
9626                 if (chk->rec.data.doing_fast_retransmit == 0) {
9627                         /*
9628                          * if no FR in progress skip destination that have
9629                          * flight_size > cwnd.
9630                          */
9631                         if (net->flight_size >= net->cwnd) {
9632                                 continue;
9633                         }
9634                 } else {
9635                         /*
9636                          * Mark the destination net to have FR recovery
9637                          * limits put on it.
9638                          */
9639                         *fr_done = 1;
9640                         net->fast_retran_ip = 1;
9641                 }
9642
9643                 /*
9644                  * if no AUTH is yet included and this chunk requires it,
9645                  * make sure to account for it.  We don't apply the size
9646                  * until the AUTH chunk is actually added below in case
9647                  * there is no room for this chunk.
9648                  */
9649                 if (data_auth_reqd && (auth == NULL)) {
9650                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9651                 } else
9652                         dmtu = 0;
9653
9654                 if ((chk->send_size <= (mtu - dmtu)) ||
9655                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9656                         /* ok we will add this one */
9657                         if (data_auth_reqd) {
9658                                 if (auth == NULL) {
9659                                         m = sctp_add_auth_chunk(m,
9660                                             &endofchain,
9661                                             &auth,
9662                                             &auth_offset,
9663                                             stcb,
9664                                             SCTP_DATA);
9665                                         auth_keyid = chk->auth_keyid;
9666                                         override_ok = 0;
9667                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9668                                 } else if (override_ok) {
9669                                         auth_keyid = chk->auth_keyid;
9670                                         override_ok = 0;
9671                                 } else if (chk->auth_keyid != auth_keyid) {
9672                                         /* different keyid, so done bundling */
9673                                         break;
9674                                 }
9675                         }
9676                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9677                         if (m == NULL) {
9678                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9679                                 return (ENOMEM);
9680                         }
9681                         /* Do clear IP_DF ? */
9682                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9683                                 no_fragmentflg = 0;
9684                         }
9685                         /* upate our MTU size */
9686                         if (mtu > (chk->send_size + dmtu))
9687                                 mtu -= (chk->send_size + dmtu);
9688                         else
9689                                 mtu = 0;
9690                         data_list[bundle_at++] = chk;
9691                         if (one_chunk && (asoc->total_flight <= 0)) {
9692                                 SCTP_STAT_INCR(sctps_windowprobed);
9693                         }
9694                 }
9695                 if (one_chunk == 0) {
9696                         /*
9697                          * now are there anymore forward from chk to pick
9698                          * up?
9699                          */
9700                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9701                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9702                                         /* Nope, not for retran */
9703                                         continue;
9704                                 }
9705                                 if (fwd->whoTo != net) {
9706                                         /* Nope, not the net in question */
9707                                         continue;
9708                                 }
9709                                 if (data_auth_reqd && (auth == NULL)) {
9710                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9711                                 } else
9712                                         dmtu = 0;
9713                                 if (fwd->send_size <= (mtu - dmtu)) {
9714                                         if (data_auth_reqd) {
9715                                                 if (auth == NULL) {
9716                                                         m = sctp_add_auth_chunk(m,
9717                                                             &endofchain,
9718                                                             &auth,
9719                                                             &auth_offset,
9720                                                             stcb,
9721                                                             SCTP_DATA);
9722                                                         auth_keyid = fwd->auth_keyid;
9723                                                         override_ok = 0;
9724                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9725                                                 } else if (override_ok) {
9726                                                         auth_keyid = fwd->auth_keyid;
9727                                                         override_ok = 0;
9728                                                 } else if (fwd->auth_keyid != auth_keyid) {
9729                                                         /*
9730                                                          * different keyid,
9731                                                          * so done bundling
9732                                                          */
9733                                                         break;
9734                                                 }
9735                                         }
9736                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9737                                         if (m == NULL) {
9738                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9739                                                 return (ENOMEM);
9740                                         }
9741                                         /* Do clear IP_DF ? */
9742                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9743                                                 no_fragmentflg = 0;
9744                                         }
9745                                         /* upate our MTU size */
9746                                         if (mtu > (fwd->send_size + dmtu))
9747                                                 mtu -= (fwd->send_size + dmtu);
9748                                         else
9749                                                 mtu = 0;
9750                                         data_list[bundle_at++] = fwd;
9751                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9752                                                 break;
9753                                         }
9754                                 } else {
9755                                         /* can't fit so we are done */
9756                                         break;
9757                                 }
9758                         }
9759                 }
9760                 /* Is there something to send for this destination? */
9761                 if (m) {
9762                         /*
9763                          * No matter if we fail/or succeed we should start a
9764                          * timer. A failure is like a lost IP packet :-)
9765                          */
9766                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9767                                 /*
9768                                  * no timer running on this destination
9769                                  * restart it.
9770                                  */
9771                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9772                                 tmr_started = 1;
9773                         }
9774                         /* Now lets send it, if there is anything to send :> */
9775                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9776                             (struct sockaddr *)&net->ro._l_addr, m,
9777                             auth_offset, auth, auth_keyid,
9778                             no_fragmentflg, 0, 0,
9779                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9780                             net->port, NULL,
9781                             0, 0,
9782                             so_locked))) {
9783                                 /* error, we could not output */
9784                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9785                                 return (error);
9786                         }
9787                         endofchain = NULL;
9788                         auth = NULL;
9789                         auth_offset = 0;
9790                         /* For HB's */
9791                         /*
9792                          * We don't want to mark the net->sent time here
9793                          * since this we use this for HB and retrans cannot
9794                          * measure RTT
9795                          */
9796                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9797
9798                         /* For auto-close */
9799                         cnt_thru++;
9800                         if (*now_filled == 0) {
9801                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9802                                 *now = asoc->time_last_sent;
9803                                 *now_filled = 1;
9804                         } else {
9805                                 asoc->time_last_sent = *now;
9806                         }
9807                         *cnt_out += bundle_at;
9808 #ifdef SCTP_AUDITING_ENABLED
9809                         sctp_audit_log(0xC4, bundle_at);
9810 #endif
9811                         if (bundle_at) {
9812                                 tsns_sent = data_list[0]->rec.data.tsn;
9813                         }
9814                         for (i = 0; i < bundle_at; i++) {
9815                                 SCTP_STAT_INCR(sctps_sendretransdata);
9816                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9817                                 /*
9818                                  * When we have a revoked data, and we
9819                                  * retransmit it, then we clear the revoked
9820                                  * flag since this flag dictates if we
9821                                  * subtracted from the fs
9822                                  */
9823                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9824                                         /* Deflate the cwnd */
9825                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9826                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9827                                 }
9828                                 data_list[i]->snd_count++;
9829                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9830                                 /* record the time */
9831                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9832                                 if (data_list[i]->book_size_scale) {
9833                                         /*
9834                                          * need to double the book size on
9835                                          * this one
9836                                          */
9837                                         data_list[i]->book_size_scale = 0;
9838                                         /*
9839                                          * Since we double the booksize, we
9840                                          * must also double the output queue
9841                                          * size, since this get shrunk when
9842                                          * we free by this amount.
9843                                          */
9844                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9845                                         data_list[i]->book_size *= 2;
9846
9847
9848                                 } else {
9849                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9850                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9851                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9852                                         }
9853                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9854                                             (uint32_t)(data_list[i]->send_size +
9855                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9856                                 }
9857                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9858                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9859                                             data_list[i]->whoTo->flight_size,
9860                                             data_list[i]->book_size,
9861                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9862                                             data_list[i]->rec.data.tsn);
9863                                 }
9864                                 sctp_flight_size_increase(data_list[i]);
9865                                 sctp_total_flight_increase(stcb, data_list[i]);
9866                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9867                                         /* SWS sender side engages */
9868                                         asoc->peers_rwnd = 0;
9869                                 }
9870                                 if ((i == 0) &&
9871                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9872                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9873                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9874                                             (tmr_started == 0)) {
9875                                                 /*-
9876                                                  * ok we just fast-retrans'd
9877                                                  * the lowest TSN, i.e the
9878                                                  * first on the list. In
9879                                                  * this case we want to give
9880                                                  * some more time to get a
9881                                                  * SACK back without a
9882                                                  * t3-expiring.
9883                                                  */
9884                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9885                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9886                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9887                                         }
9888                                 }
9889                         }
9890                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9891                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9892                         }
9893 #ifdef SCTP_AUDITING_ENABLED
9894                         sctp_auditing(21, inp, stcb, NULL);
9895 #endif
9896                 } else {
9897                         /* None will fit */
9898                         return (1);
9899                 }
9900                 if (asoc->sent_queue_retran_cnt <= 0) {
9901                         /* all done we have no more to retran */
9902                         asoc->sent_queue_retran_cnt = 0;
9903                         break;
9904                 }
9905                 if (one_chunk) {
9906                         /* No more room in rwnd */
9907                         return (1);
9908                 }
9909                 /* stop the for loop here. we sent out a packet */
9910                 break;
9911         }
9912         return (0);
9913 }
9914
9915 static void
9916 sctp_timer_validation(struct sctp_inpcb *inp,
9917     struct sctp_tcb *stcb,
9918     struct sctp_association *asoc)
9919 {
9920         struct sctp_nets *net;
9921
9922         /* Validate that a timer is running somewhere */
9923         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9924                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9925                         /* Here is a timer */
9926                         return;
9927                 }
9928         }
9929         SCTP_TCB_LOCK_ASSERT(stcb);
9930         /* Gak, we did not have a timer somewhere */
9931         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9932         if (asoc->alternate) {
9933                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9934         } else {
9935                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9936         }
9937         return;
9938 }
9939
9940 void
9941 sctp_chunk_output(struct sctp_inpcb *inp,
9942     struct sctp_tcb *stcb,
9943     int from_where,
9944     int so_locked
9945 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9946     SCTP_UNUSED
9947 #endif
9948 )
9949 {
9950         /*-
9951          * Ok this is the generic chunk service queue. we must do the
9952          * following:
9953          * - See if there are retransmits pending, if so we must
9954          *   do these first.
9955          * - Service the stream queue that is next, moving any
9956          *   message (note I must get a complete message i.e.
9957          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9958          *   TSN's
9959          * - Check to see if the cwnd/rwnd allows any output, if so we
9960          *   go ahead and fomulate and send the low level chunks. Making sure
9961          *   to combine any control in the control chunk queue also.
9962          */
9963         struct sctp_association *asoc;
9964         struct sctp_nets *net;
9965         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9966         unsigned int burst_cnt = 0;
9967         struct timeval now;
9968         int now_filled = 0;
9969         int nagle_on;
9970         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9971         int un_sent = 0;
9972         int fr_done;
9973         unsigned int tot_frs = 0;
9974
9975         asoc = &stcb->asoc;
9976 do_it_again:
9977         /* The Nagle algorithm is only applied when handling a send call. */
9978         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9979                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9980                         nagle_on = 0;
9981                 } else {
9982                         nagle_on = 1;
9983                 }
9984         } else {
9985                 nagle_on = 0;
9986         }
9987         SCTP_TCB_LOCK_ASSERT(stcb);
9988
9989         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9990
9991         if ((un_sent <= 0) &&
9992             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9993             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9994             (asoc->sent_queue_retran_cnt == 0) &&
9995             (asoc->trigger_reset == 0)) {
9996                 /* Nothing to do unless there is something to be sent left */
9997                 return;
9998         }
9999         /*
10000          * Do we have something to send, data or control AND a sack timer
10001          * running, if so piggy-back the sack.
10002          */
10003         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10004                 sctp_send_sack(stcb, so_locked);
10005                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10006         }
10007         while (asoc->sent_queue_retran_cnt) {
10008                 /*-
10009                  * Ok, it is retransmission time only, we send out only ONE
10010                  * packet with a single call off to the retran code.
10011                  */
10012                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10013                         /*-
10014                          * Special hook for handling cookiess discarded
10015                          * by peer that carried data. Send cookie-ack only
10016                          * and then the next call with get the retran's.
10017                          */
10018                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10019                             from_where,
10020                             &now, &now_filled, frag_point, so_locked);
10021                         return;
10022                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10023                         /* if its not from a HB then do it */
10024                         fr_done = 0;
10025                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10026                         if (fr_done) {
10027                                 tot_frs++;
10028                         }
10029                 } else {
10030                         /*
10031                          * its from any other place, we don't allow retran
10032                          * output (only control)
10033                          */
10034                         ret = 1;
10035                 }
10036                 if (ret > 0) {
10037                         /* Can't send anymore */
10038                         /*-
10039                          * now lets push out control by calling med-level
10040                          * output once. this assures that we WILL send HB's
10041                          * if queued too.
10042                          */
10043                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10044                             from_where,
10045                             &now, &now_filled, frag_point, so_locked);
10046 #ifdef SCTP_AUDITING_ENABLED
10047                         sctp_auditing(8, inp, stcb, NULL);
10048 #endif
10049                         sctp_timer_validation(inp, stcb, asoc);
10050                         return;
10051                 }
10052                 if (ret < 0) {
10053                         /*-
10054                          * The count was off.. retran is not happening so do
10055                          * the normal retransmission.
10056                          */
10057 #ifdef SCTP_AUDITING_ENABLED
10058                         sctp_auditing(9, inp, stcb, NULL);
10059 #endif
10060                         if (ret == SCTP_RETRAN_EXIT) {
10061                                 return;
10062                         }
10063                         break;
10064                 }
10065                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10066                         /* Only one transmission allowed out of a timeout */
10067 #ifdef SCTP_AUDITING_ENABLED
10068                         sctp_auditing(10, inp, stcb, NULL);
10069 #endif
10070                         /* Push out any control */
10071                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10072                             &now, &now_filled, frag_point, so_locked);
10073                         return;
10074                 }
10075                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10076                         /* Hit FR burst limit */
10077                         return;
10078                 }
10079                 if ((num_out == 0) && (ret == 0)) {
10080                         /* No more retrans to send */
10081                         break;
10082                 }
10083         }
10084 #ifdef SCTP_AUDITING_ENABLED
10085         sctp_auditing(12, inp, stcb, NULL);
10086 #endif
10087         /* Check for bad destinations, if they exist move chunks around. */
10088         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10089                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10090                         /*-
10091                          * if possible move things off of this address we
10092                          * still may send below due to the dormant state but
10093                          * we try to find an alternate address to send to
10094                          * and if we have one we move all queued data on the
10095                          * out wheel to this alternate address.
10096                          */
10097                         if (net->ref_count > 1)
10098                                 sctp_move_chunks_from_net(stcb, net);
10099                 } else {
10100                         /*-
10101                          * if ((asoc->sat_network) || (net->addr_is_local))
10102                          * { burst_limit = asoc->max_burst *
10103                          * SCTP_SAT_NETWORK_BURST_INCR; }
10104                          */
10105                         if (asoc->max_burst > 0) {
10106                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10107                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10108                                                 /*
10109                                                  * JRS - Use the congestion
10110                                                  * control given in the
10111                                                  * congestion control module
10112                                                  */
10113                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10114                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10115                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10116                                                 }
10117                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10118                                         }
10119                                         net->fast_retran_ip = 0;
10120                                 } else {
10121                                         if (net->flight_size == 0) {
10122                                                 /*
10123                                                  * Should be decaying the
10124                                                  * cwnd here
10125                                                  */
10126                                                 ;
10127                                         }
10128                                 }
10129                         }
10130                 }
10131
10132         }
10133         burst_cnt = 0;
10134         do {
10135                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10136                     &reason_code, 0, from_where,
10137                     &now, &now_filled, frag_point, so_locked);
10138                 if (error) {
10139                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10140                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10141                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10142                         }
10143                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10144                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10145                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10146                         }
10147                         break;
10148                 }
10149                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10150
10151                 tot_out += num_out;
10152                 burst_cnt++;
10153                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10154                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10155                         if (num_out == 0) {
10156                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10157                         }
10158                 }
10159                 if (nagle_on) {
10160                         /*
10161                          * When the Nagle algorithm is used, look at how
10162                          * much is unsent, then if its smaller than an MTU
10163                          * and we have data in flight we stop, except if we
10164                          * are handling a fragmented user message.
10165                          */
10166                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10167                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10168                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10169                             (stcb->asoc.total_flight > 0)) {
10170 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10171                                 break;
10172                         }
10173                 }
10174                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10175                     TAILQ_EMPTY(&asoc->send_queue) &&
10176                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10177                         /* Nothing left to send */
10178                         break;
10179                 }
10180                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10181                         /* Nothing left to send */
10182                         break;
10183                 }
10184         } while (num_out &&
10185             ((asoc->max_burst == 0) ||
10186             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10187             (burst_cnt < asoc->max_burst)));
10188
10189         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10190                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10191                         SCTP_STAT_INCR(sctps_maxburstqueued);
10192                         asoc->burst_limit_applied = 1;
10193                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10194                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10195                         }
10196                 } else {
10197                         asoc->burst_limit_applied = 0;
10198                 }
10199         }
10200         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10201                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10202         }
10203         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10204             tot_out);
10205
10206         /*-
10207          * Now we need to clean up the control chunk chain if a ECNE is on
10208          * it. It must be marked as UNSENT again so next call will continue
10209          * to send it until such time that we get a CWR, to remove it.
10210          */
10211         if (stcb->asoc.ecn_echo_cnt_onq)
10212                 sctp_fix_ecn_echo(asoc);
10213
10214         if (stcb->asoc.trigger_reset) {
10215                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10216                         goto do_it_again;
10217                 }
10218         }
10219         return;
10220 }
10221
10222
10223 int
10224 sctp_output(
10225     struct sctp_inpcb *inp,
10226     struct mbuf *m,
10227     struct sockaddr *addr,
10228     struct mbuf *control,
10229     struct thread *p,
10230     int flags)
10231 {
10232         if (inp == NULL) {
10233                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10234                 return (EINVAL);
10235         }
10236         if (inp->sctp_socket == NULL) {
10237                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10238                 return (EINVAL);
10239         }
10240         return (sctp_sosend(inp->sctp_socket,
10241             addr,
10242             (struct uio *)NULL,
10243             m,
10244             control,
10245             flags, p
10246             ));
10247 }
10248
10249 void
10250 send_forward_tsn(struct sctp_tcb *stcb,
10251     struct sctp_association *asoc)
10252 {
10253         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10254         struct sctp_forward_tsn_chunk *fwdtsn;
10255         struct sctp_strseq *strseq;
10256         struct sctp_strseq_mid *strseq_m;
10257         uint32_t advance_peer_ack_point;
10258         unsigned int cnt_of_space, i, ovh;
10259         unsigned int space_needed;
10260         unsigned int cnt_of_skipped = 0;
10261
10262         SCTP_TCB_LOCK_ASSERT(stcb);
10263         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10264                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10265                         /* mark it to unsent */
10266                         chk->sent = SCTP_DATAGRAM_UNSENT;
10267                         chk->snd_count = 0;
10268                         /* Do we correct its output location? */
10269                         if (chk->whoTo) {
10270                                 sctp_free_remote_addr(chk->whoTo);
10271                                 chk->whoTo = NULL;
10272                         }
10273                         goto sctp_fill_in_rest;
10274                 }
10275         }
10276         /* Ok if we reach here we must build one */
10277         sctp_alloc_a_chunk(stcb, chk);
10278         if (chk == NULL) {
10279                 return;
10280         }
10281         asoc->fwd_tsn_cnt++;
10282         chk->copy_by_ref = 0;
10283         /*
10284          * We don't do the old thing here since this is used not for on-wire
10285          * but to tell if we are sending a fwd-tsn by the stack during
10286          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10287          */
10288         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10289         chk->rec.chunk_id.can_take_data = 0;
10290         chk->flags = 0;
10291         chk->asoc = asoc;
10292         chk->whoTo = NULL;
10293         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10294         if (chk->data == NULL) {
10295                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10296                 return;
10297         }
10298         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10299         chk->sent = SCTP_DATAGRAM_UNSENT;
10300         chk->snd_count = 0;
10301         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10302         asoc->ctrl_queue_cnt++;
10303 sctp_fill_in_rest:
10304         /*-
10305          * Here we go through and fill out the part that deals with
10306          * stream/seq of the ones we skip.
10307          */
10308         SCTP_BUF_LEN(chk->data) = 0;
10309         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10310                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10311                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10312                         /* no more to look at */
10313                         break;
10314                 }
10315                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10316                         /* We don't report these */
10317                         continue;
10318                 }
10319                 cnt_of_skipped++;
10320         }
10321         if (asoc->idata_supported) {
10322                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10323                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10324         } else {
10325                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10326                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10327         }
10328         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10329
10330         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10331                 ovh = SCTP_MIN_OVERHEAD;
10332         } else {
10333                 ovh = SCTP_MIN_V4_OVERHEAD;
10334         }
10335         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10336                 /* trim to a mtu size */
10337                 cnt_of_space = asoc->smallest_mtu - ovh;
10338         }
10339         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10340                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10341                     0xff, 0, cnt_of_skipped,
10342                     asoc->advanced_peer_ack_point);
10343         }
10344         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10345         if (cnt_of_space < space_needed) {
10346                 /*-
10347                  * ok we must trim down the chunk by lowering the
10348                  * advance peer ack point.
10349                  */
10350                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10351                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10352                             0xff, 0xff, cnt_of_space,
10353                             space_needed);
10354                 }
10355                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10356                 if (asoc->idata_supported) {
10357                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10358                 } else {
10359                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10360                 }
10361                 /*-
10362                  * Go through and find the TSN that will be the one
10363                  * we report.
10364                  */
10365                 at = TAILQ_FIRST(&asoc->sent_queue);
10366                 if (at != NULL) {
10367                         for (i = 0; i < cnt_of_skipped; i++) {
10368                                 tp1 = TAILQ_NEXT(at, sctp_next);
10369                                 if (tp1 == NULL) {
10370                                         break;
10371                                 }
10372                                 at = tp1;
10373                         }
10374                 }
10375                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10376                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10377                             0xff, cnt_of_skipped, at->rec.data.tsn,
10378                             asoc->advanced_peer_ack_point);
10379                 }
10380                 last = at;
10381                 /*-
10382                  * last now points to last one I can report, update
10383                  * peer ack point
10384                  */
10385                 if (last) {
10386                         advance_peer_ack_point = last->rec.data.tsn;
10387                 }
10388                 if (asoc->idata_supported) {
10389                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10390                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10391                 } else {
10392                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10393                             cnt_of_skipped * sizeof(struct sctp_strseq);
10394                 }
10395         }
10396         chk->send_size = space_needed;
10397         /* Setup the chunk */
10398         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10399         fwdtsn->ch.chunk_length = htons(chk->send_size);
10400         fwdtsn->ch.chunk_flags = 0;
10401         if (asoc->idata_supported) {
10402                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10403         } else {
10404                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10405         }
10406         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10407         SCTP_BUF_LEN(chk->data) = chk->send_size;
10408         fwdtsn++;
10409         /*-
10410          * Move pointer to after the fwdtsn and transfer to the
10411          * strseq pointer.
10412          */
10413         if (asoc->idata_supported) {
10414                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10415                 strseq = NULL;
10416         } else {
10417                 strseq = (struct sctp_strseq *)fwdtsn;
10418                 strseq_m = NULL;
10419         }
10420         /*-
10421          * Now populate the strseq list. This is done blindly
10422          * without pulling out duplicate stream info. This is
10423          * inefficent but won't harm the process since the peer will
10424          * look at these in sequence and will thus release anything.
10425          * It could mean we exceed the PMTU and chop off some that
10426          * we could have included.. but this is unlikely (aka 1432/4
10427          * would mean 300+ stream seq's would have to be reported in
10428          * one FWD-TSN. With a bit of work we can later FIX this to
10429          * optimize and pull out duplicates.. but it does add more
10430          * overhead. So for now... not!
10431          */
10432         i = 0;
10433         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10434                 if (i >= cnt_of_skipped) {
10435                         break;
10436                 }
10437                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10438                         /* We don't report these */
10439                         continue;
10440                 }
10441                 if (at->rec.data.tsn == advance_peer_ack_point) {
10442                         at->rec.data.fwd_tsn_cnt = 0;
10443                 }
10444                 if (asoc->idata_supported) {
10445                         strseq_m->sid = htons(at->rec.data.sid);
10446                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10447                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10448                         } else {
10449                                 strseq_m->flags = 0;
10450                         }
10451                         strseq_m->mid = htonl(at->rec.data.mid);
10452                         strseq_m++;
10453                 } else {
10454                         strseq->sid = htons(at->rec.data.sid);
10455                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10456                         strseq++;
10457                 }
10458                 i++;
10459         }
10460         return;
10461 }
10462
10463 void
10464 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10465 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10466     SCTP_UNUSED
10467 #endif
10468 )
10469 {
10470         /*-
10471          * Queue up a SACK or NR-SACK in the control queue.
10472          * We must first check to see if a SACK or NR-SACK is
10473          * somehow on the control queue.
10474          * If so, we will take and and remove the old one.
10475          */
10476         struct sctp_association *asoc;
10477         struct sctp_tmit_chunk *chk, *a_chk;
10478         struct sctp_sack_chunk *sack;
10479         struct sctp_nr_sack_chunk *nr_sack;
10480         struct sctp_gap_ack_block *gap_descriptor;
10481         const struct sack_track *selector;
10482         int mergeable = 0;
10483         int offset;
10484         caddr_t limit;
10485         uint32_t *dup;
10486         int limit_reached = 0;
10487         unsigned int i, siz, j;
10488         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10489         int num_dups = 0;
10490         int space_req;
10491         uint32_t highest_tsn;
10492         uint8_t flags;
10493         uint8_t type;
10494         uint8_t tsn_map;
10495
10496         if (stcb->asoc.nrsack_supported == 1) {
10497                 type = SCTP_NR_SELECTIVE_ACK;
10498         } else {
10499                 type = SCTP_SELECTIVE_ACK;
10500         }
10501         a_chk = NULL;
10502         asoc = &stcb->asoc;
10503         SCTP_TCB_LOCK_ASSERT(stcb);
10504         if (asoc->last_data_chunk_from == NULL) {
10505                 /* Hmm we never received anything */
10506                 return;
10507         }
10508         sctp_slide_mapping_arrays(stcb);
10509         sctp_set_rwnd(stcb, asoc);
10510         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10511                 if (chk->rec.chunk_id.id == type) {
10512                         /* Hmm, found a sack already on queue, remove it */
10513                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10514                         asoc->ctrl_queue_cnt--;
10515                         a_chk = chk;
10516                         if (a_chk->data) {
10517                                 sctp_m_freem(a_chk->data);
10518                                 a_chk->data = NULL;
10519                         }
10520                         if (a_chk->whoTo) {
10521                                 sctp_free_remote_addr(a_chk->whoTo);
10522                                 a_chk->whoTo = NULL;
10523                         }
10524                         break;
10525                 }
10526         }
10527         if (a_chk == NULL) {
10528                 sctp_alloc_a_chunk(stcb, a_chk);
10529                 if (a_chk == NULL) {
10530                         /* No memory so we drop the idea, and set a timer */
10531                         if (stcb->asoc.delayed_ack) {
10532                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10533                                     stcb->sctp_ep, stcb, NULL,
10534                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10535                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10536                                     stcb->sctp_ep, stcb, NULL);
10537                         } else {
10538                                 stcb->asoc.send_sack = 1;
10539                         }
10540                         return;
10541                 }
10542                 a_chk->copy_by_ref = 0;
10543                 a_chk->rec.chunk_id.id = type;
10544                 a_chk->rec.chunk_id.can_take_data = 1;
10545         }
10546         /* Clear our pkt counts */
10547         asoc->data_pkts_seen = 0;
10548
10549         a_chk->flags = 0;
10550         a_chk->asoc = asoc;
10551         a_chk->snd_count = 0;
10552         a_chk->send_size = 0;   /* fill in later */
10553         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10554         a_chk->whoTo = NULL;
10555
10556         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10557                 /*-
10558                  * Ok, the destination for the SACK is unreachable, lets see if
10559                  * we can select an alternate to asoc->last_data_chunk_from
10560                  */
10561                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10562                 if (a_chk->whoTo == NULL) {
10563                         /* Nope, no alternate */
10564                         a_chk->whoTo = asoc->last_data_chunk_from;
10565                 }
10566         } else {
10567                 a_chk->whoTo = asoc->last_data_chunk_from;
10568         }
10569         if (a_chk->whoTo) {
10570                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10571         }
10572         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10573                 highest_tsn = asoc->highest_tsn_inside_map;
10574         } else {
10575                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10576         }
10577         if (highest_tsn == asoc->cumulative_tsn) {
10578                 /* no gaps */
10579                 if (type == SCTP_SELECTIVE_ACK) {
10580                         space_req = sizeof(struct sctp_sack_chunk);
10581                 } else {
10582                         space_req = sizeof(struct sctp_nr_sack_chunk);
10583                 }
10584         } else {
10585                 /* gaps get a cluster */
10586                 space_req = MCLBYTES;
10587         }
10588         /* Ok now lets formulate a MBUF with our sack */
10589         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10590         if ((a_chk->data == NULL) ||
10591             (a_chk->whoTo == NULL)) {
10592                 /* rats, no mbuf memory */
10593                 if (a_chk->data) {
10594                         /* was a problem with the destination */
10595                         sctp_m_freem(a_chk->data);
10596                         a_chk->data = NULL;
10597                 }
10598                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10599                 /* sa_ignore NO_NULL_CHK */
10600                 if (stcb->asoc.delayed_ack) {
10601                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10602                             stcb->sctp_ep, stcb, NULL,
10603                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10604                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10605                             stcb->sctp_ep, stcb, NULL);
10606                 } else {
10607                         stcb->asoc.send_sack = 1;
10608                 }
10609                 return;
10610         }
10611         /* ok, lets go through and fill it in */
10612         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10613         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10614         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10615                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10616         }
10617         limit = mtod(a_chk->data, caddr_t);
10618         limit += space;
10619
10620         flags = 0;
10621
10622         if ((asoc->sctp_cmt_on_off > 0) &&
10623             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10624                 /*-
10625                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10626                  * received, then set high bit to 1, else 0. Reset
10627                  * pkts_rcvd.
10628                  */
10629                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10630                 asoc->cmt_dac_pkts_rcvd = 0;
10631         }
10632 #ifdef SCTP_ASOCLOG_OF_TSNS
10633         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10634         stcb->asoc.cumack_log_atsnt++;
10635         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10636                 stcb->asoc.cumack_log_atsnt = 0;
10637         }
10638 #endif
10639         /* reset the readers interpretation */
10640         stcb->freed_by_sorcv_sincelast = 0;
10641
10642         if (type == SCTP_SELECTIVE_ACK) {
10643                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10644                 nr_sack = NULL;
10645                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10646                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10647                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10648                 } else {
10649                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10650                 }
10651         } else {
10652                 sack = NULL;
10653                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10654                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10655                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10656                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10657                 } else {
10658                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10659                 }
10660         }
10661
10662         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10663                 offset = 1;
10664         } else {
10665                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10666         }
10667         if (((type == SCTP_SELECTIVE_ACK) &&
10668             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10669             ((type == SCTP_NR_SELECTIVE_ACK) &&
10670             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10671                 /* we have a gap .. maybe */
10672                 for (i = 0; i < siz; i++) {
10673                         tsn_map = asoc->mapping_array[i];
10674                         if (type == SCTP_SELECTIVE_ACK) {
10675                                 tsn_map |= asoc->nr_mapping_array[i];
10676                         }
10677                         if (i == 0) {
10678                                 /*
10679                                  * Clear all bits corresponding to TSNs
10680                                  * smaller or equal to the cumulative TSN.
10681                                  */
10682                                 tsn_map &= (~0U << (1 - offset));
10683                         }
10684                         selector = &sack_array[tsn_map];
10685                         if (mergeable && selector->right_edge) {
10686                                 /*
10687                                  * Backup, left and right edges were ok to
10688                                  * merge.
10689                                  */
10690                                 num_gap_blocks--;
10691                                 gap_descriptor--;
10692                         }
10693                         if (selector->num_entries == 0)
10694                                 mergeable = 0;
10695                         else {
10696                                 for (j = 0; j < selector->num_entries; j++) {
10697                                         if (mergeable && selector->right_edge) {
10698                                                 /*
10699                                                  * do a merge by NOT setting
10700                                                  * the left side
10701                                                  */
10702                                                 mergeable = 0;
10703                                         } else {
10704                                                 /*
10705                                                  * no merge, set the left
10706                                                  * side
10707                                                  */
10708                                                 mergeable = 0;
10709                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10710                                         }
10711                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10712                                         num_gap_blocks++;
10713                                         gap_descriptor++;
10714                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10715                                                 /* no more room */
10716                                                 limit_reached = 1;
10717                                                 break;
10718                                         }
10719                                 }
10720                                 if (selector->left_edge) {
10721                                         mergeable = 1;
10722                                 }
10723                         }
10724                         if (limit_reached) {
10725                                 /* Reached the limit stop */
10726                                 break;
10727                         }
10728                         offset += 8;
10729                 }
10730         }
10731         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10732             (limit_reached == 0)) {
10733
10734                 mergeable = 0;
10735
10736                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10737                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10738                 } else {
10739                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10740                 }
10741
10742                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10743                         offset = 1;
10744                 } else {
10745                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10746                 }
10747                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10748                         /* we have a gap .. maybe */
10749                         for (i = 0; i < siz; i++) {
10750                                 tsn_map = asoc->nr_mapping_array[i];
10751                                 if (i == 0) {
10752                                         /*
10753                                          * Clear all bits corresponding to
10754                                          * TSNs smaller or equal to the
10755                                          * cumulative TSN.
10756                                          */
10757                                         tsn_map &= (~0U << (1 - offset));
10758                                 }
10759                                 selector = &sack_array[tsn_map];
10760                                 if (mergeable && selector->right_edge) {
10761                                         /*
10762                                          * Backup, left and right edges were
10763                                          * ok to merge.
10764                                          */
10765                                         num_nr_gap_blocks--;
10766                                         gap_descriptor--;
10767                                 }
10768                                 if (selector->num_entries == 0)
10769                                         mergeable = 0;
10770                                 else {
10771                                         for (j = 0; j < selector->num_entries; j++) {
10772                                                 if (mergeable && selector->right_edge) {
10773                                                         /*
10774                                                          * do a merge by NOT
10775                                                          * setting the left
10776                                                          * side
10777                                                          */
10778                                                         mergeable = 0;
10779                                                 } else {
10780                                                         /*
10781                                                          * no merge, set the
10782                                                          * left side
10783                                                          */
10784                                                         mergeable = 0;
10785                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10786                                                 }
10787                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10788                                                 num_nr_gap_blocks++;
10789                                                 gap_descriptor++;
10790                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10791                                                         /* no more room */
10792                                                         limit_reached = 1;
10793                                                         break;
10794                                                 }
10795                                         }
10796                                         if (selector->left_edge) {
10797                                                 mergeable = 1;
10798                                         }
10799                                 }
10800                                 if (limit_reached) {
10801                                         /* Reached the limit stop */
10802                                         break;
10803                                 }
10804                                 offset += 8;
10805                         }
10806                 }
10807         }
10808         /* now we must add any dups we are going to report. */
10809         if ((limit_reached == 0) && (asoc->numduptsns)) {
10810                 dup = (uint32_t *)gap_descriptor;
10811                 for (i = 0; i < asoc->numduptsns; i++) {
10812                         *dup = htonl(asoc->dup_tsns[i]);
10813                         dup++;
10814                         num_dups++;
10815                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10816                                 /* no more room */
10817                                 break;
10818                         }
10819                 }
10820                 asoc->numduptsns = 0;
10821         }
10822         /*
10823          * now that the chunk is prepared queue it to the control chunk
10824          * queue.
10825          */
10826         if (type == SCTP_SELECTIVE_ACK) {
10827                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10828                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10829                     num_dups * sizeof(int32_t));
10830                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10831                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10832                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10833                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10834                 sack->sack.num_dup_tsns = htons(num_dups);
10835                 sack->ch.chunk_type = type;
10836                 sack->ch.chunk_flags = flags;
10837                 sack->ch.chunk_length = htons(a_chk->send_size);
10838         } else {
10839                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10840                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10841                     num_dups * sizeof(int32_t));
10842                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10843                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10844                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10845                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10846                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10847                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10848                 nr_sack->nr_sack.reserved = 0;
10849                 nr_sack->ch.chunk_type = type;
10850                 nr_sack->ch.chunk_flags = flags;
10851                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10852         }
10853         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10854         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10855         asoc->ctrl_queue_cnt++;
10856         asoc->send_sack = 0;
10857         SCTP_STAT_INCR(sctps_sendsacks);
10858         return;
10859 }
10860
10861 void
10862 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10863 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10864     SCTP_UNUSED
10865 #endif
10866 )
10867 {
10868         struct mbuf *m_abort, *m, *m_last;
10869         struct mbuf *m_out, *m_end = NULL;
10870         struct sctp_abort_chunk *abort;
10871         struct sctp_auth_chunk *auth = NULL;
10872         struct sctp_nets *net;
10873         uint32_t vtag;
10874         uint32_t auth_offset = 0;
10875         uint16_t cause_len, chunk_len, padding_len;
10876
10877         SCTP_TCB_LOCK_ASSERT(stcb);
10878         /*-
10879          * Add an AUTH chunk, if chunk requires it and save the offset into
10880          * the chain for AUTH
10881          */
10882         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10883             stcb->asoc.peer_auth_chunks)) {
10884                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10885                     stcb, SCTP_ABORT_ASSOCIATION);
10886                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10887         } else {
10888                 m_out = NULL;
10889         }
10890         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10891         if (m_abort == NULL) {
10892                 if (m_out) {
10893                         sctp_m_freem(m_out);
10894                 }
10895                 if (operr) {
10896                         sctp_m_freem(operr);
10897                 }
10898                 return;
10899         }
10900         /* link in any error */
10901         SCTP_BUF_NEXT(m_abort) = operr;
10902         cause_len = 0;
10903         m_last = NULL;
10904         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10905                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10906                 if (SCTP_BUF_NEXT(m) == NULL) {
10907                         m_last = m;
10908                 }
10909         }
10910         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10911         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10912         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10913         if (m_out == NULL) {
10914                 /* NO Auth chunk prepended, so reserve space in front */
10915                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10916                 m_out = m_abort;
10917         } else {
10918                 /* Put AUTH chunk at the front of the chain */
10919                 SCTP_BUF_NEXT(m_end) = m_abort;
10920         }
10921         if (stcb->asoc.alternate) {
10922                 net = stcb->asoc.alternate;
10923         } else {
10924                 net = stcb->asoc.primary_destination;
10925         }
10926         /* Fill in the ABORT chunk header. */
10927         abort = mtod(m_abort, struct sctp_abort_chunk *);
10928         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10929         if (stcb->asoc.peer_vtag == 0) {
10930                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10931                 vtag = stcb->asoc.my_vtag;
10932                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10933         } else {
10934                 vtag = stcb->asoc.peer_vtag;
10935                 abort->ch.chunk_flags = 0;
10936         }
10937         abort->ch.chunk_length = htons(chunk_len);
10938         /* Add padding, if necessary. */
10939         if (padding_len > 0) {
10940                 if ((m_last == NULL) ||
10941                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10942                         sctp_m_freem(m_out);
10943                         return;
10944                 }
10945         }
10946         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10947             (struct sockaddr *)&net->ro._l_addr,
10948             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10949             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10950             stcb->asoc.primary_destination->port, NULL,
10951             0, 0,
10952             so_locked);
10953         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10954 }
10955
10956 void
10957 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10958     struct sctp_nets *net,
10959     int reflect_vtag)
10960 {
10961         /* formulate and SEND a SHUTDOWN-COMPLETE */
10962         struct mbuf *m_shutdown_comp;
10963         struct sctp_shutdown_complete_chunk *shutdown_complete;
10964         uint32_t vtag;
10965         uint8_t flags;
10966
10967         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10968         if (m_shutdown_comp == NULL) {
10969                 /* no mbuf's */
10970                 return;
10971         }
10972         if (reflect_vtag) {
10973                 flags = SCTP_HAD_NO_TCB;
10974                 vtag = stcb->asoc.my_vtag;
10975         } else {
10976                 flags = 0;
10977                 vtag = stcb->asoc.peer_vtag;
10978         }
10979         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10980         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10981         shutdown_complete->ch.chunk_flags = flags;
10982         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10983         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10984         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10985             (struct sockaddr *)&net->ro._l_addr,
10986             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10987             stcb->sctp_ep->sctp_lport, stcb->rport,
10988             htonl(vtag),
10989             net->port, NULL,
10990             0, 0,
10991             SCTP_SO_NOT_LOCKED);
10992         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10993         return;
10994 }
10995
10996 static void
10997 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10998     struct sctphdr *sh, uint32_t vtag,
10999     uint8_t type, struct mbuf *cause,
11000     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11001     uint32_t vrf_id, uint16_t port)
11002 {
11003         struct mbuf *o_pak;
11004         struct mbuf *mout;
11005         struct sctphdr *shout;
11006         struct sctp_chunkhdr *ch;
11007 #if defined(INET) || defined(INET6)
11008         struct udphdr *udp;
11009         int ret;
11010 #endif
11011         int len, cause_len, padding_len;
11012 #ifdef INET
11013         struct sockaddr_in *src_sin, *dst_sin;
11014         struct ip *ip;
11015 #endif
11016 #ifdef INET6
11017         struct sockaddr_in6 *src_sin6, *dst_sin6;
11018         struct ip6_hdr *ip6;
11019 #endif
11020
11021         /* Compute the length of the cause and add final padding. */
11022         cause_len = 0;
11023         if (cause != NULL) {
11024                 struct mbuf *m_at, *m_last = NULL;
11025
11026                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11027                         if (SCTP_BUF_NEXT(m_at) == NULL)
11028                                 m_last = m_at;
11029                         cause_len += SCTP_BUF_LEN(m_at);
11030                 }
11031                 padding_len = cause_len % 4;
11032                 if (padding_len != 0) {
11033                         padding_len = 4 - padding_len;
11034                 }
11035                 if (padding_len != 0) {
11036                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11037                                 sctp_m_freem(cause);
11038                                 return;
11039                         }
11040                 }
11041         } else {
11042                 padding_len = 0;
11043         }
11044         /* Get an mbuf for the header. */
11045         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11046         switch (dst->sa_family) {
11047 #ifdef INET
11048         case AF_INET:
11049                 len += sizeof(struct ip);
11050                 break;
11051 #endif
11052 #ifdef INET6
11053         case AF_INET6:
11054                 len += sizeof(struct ip6_hdr);
11055                 break;
11056 #endif
11057         default:
11058                 break;
11059         }
11060 #if defined(INET) || defined(INET6)
11061         if (port) {
11062                 len += sizeof(struct udphdr);
11063         }
11064 #endif
11065         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11066         if (mout == NULL) {
11067                 if (cause) {
11068                         sctp_m_freem(cause);
11069                 }
11070                 return;
11071         }
11072         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11073         SCTP_BUF_LEN(mout) = len;
11074         SCTP_BUF_NEXT(mout) = cause;
11075         M_SETFIB(mout, fibnum);
11076         mout->m_pkthdr.flowid = mflowid;
11077         M_HASHTYPE_SET(mout, mflowtype);
11078 #ifdef INET
11079         ip = NULL;
11080 #endif
11081 #ifdef INET6
11082         ip6 = NULL;
11083 #endif
11084         switch (dst->sa_family) {
11085 #ifdef INET
11086         case AF_INET:
11087                 src_sin = (struct sockaddr_in *)src;
11088                 dst_sin = (struct sockaddr_in *)dst;
11089                 ip = mtod(mout, struct ip *);
11090                 ip->ip_v = IPVERSION;
11091                 ip->ip_hl = (sizeof(struct ip) >> 2);
11092                 ip->ip_tos = 0;
11093                 ip->ip_off = 0;
11094                 ip_fillid(ip);
11095                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11096                 if (port) {
11097                         ip->ip_p = IPPROTO_UDP;
11098                 } else {
11099                         ip->ip_p = IPPROTO_SCTP;
11100                 }
11101                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11102                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11103                 ip->ip_sum = 0;
11104                 len = sizeof(struct ip);
11105                 shout = (struct sctphdr *)((caddr_t)ip + len);
11106                 break;
11107 #endif
11108 #ifdef INET6
11109         case AF_INET6:
11110                 src_sin6 = (struct sockaddr_in6 *)src;
11111                 dst_sin6 = (struct sockaddr_in6 *)dst;
11112                 ip6 = mtod(mout, struct ip6_hdr *);
11113                 ip6->ip6_flow = htonl(0x60000000);
11114                 if (V_ip6_auto_flowlabel) {
11115                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11116                 }
11117                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11118                 if (port) {
11119                         ip6->ip6_nxt = IPPROTO_UDP;
11120                 } else {
11121                         ip6->ip6_nxt = IPPROTO_SCTP;
11122                 }
11123                 ip6->ip6_src = dst_sin6->sin6_addr;
11124                 ip6->ip6_dst = src_sin6->sin6_addr;
11125                 len = sizeof(struct ip6_hdr);
11126                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11127                 break;
11128 #endif
11129         default:
11130                 len = 0;
11131                 shout = mtod(mout, struct sctphdr *);
11132                 break;
11133         }
11134 #if defined(INET) || defined(INET6)
11135         if (port) {
11136                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11137                         sctp_m_freem(mout);
11138                         return;
11139                 }
11140                 udp = (struct udphdr *)shout;
11141                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11142                 udp->uh_dport = port;
11143                 udp->uh_sum = 0;
11144                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11145                     sizeof(struct sctphdr) +
11146                     sizeof(struct sctp_chunkhdr) +
11147                     cause_len + padding_len));
11148                 len += sizeof(struct udphdr);
11149                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11150         } else {
11151                 udp = NULL;
11152         }
11153 #endif
11154         shout->src_port = sh->dest_port;
11155         shout->dest_port = sh->src_port;
11156         shout->checksum = 0;
11157         if (vtag) {
11158                 shout->v_tag = htonl(vtag);
11159         } else {
11160                 shout->v_tag = sh->v_tag;
11161         }
11162         len += sizeof(struct sctphdr);
11163         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11164         ch->chunk_type = type;
11165         if (vtag) {
11166                 ch->chunk_flags = 0;
11167         } else {
11168                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11169         }
11170         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11171         len += sizeof(struct sctp_chunkhdr);
11172         len += cause_len + padding_len;
11173
11174         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11175                 sctp_m_freem(mout);
11176                 return;
11177         }
11178         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11179         switch (dst->sa_family) {
11180 #ifdef INET
11181         case AF_INET:
11182                 if (port) {
11183                         if (V_udp_cksum) {
11184                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11185                         } else {
11186                                 udp->uh_sum = 0;
11187                         }
11188                 }
11189                 ip->ip_len = htons(len);
11190                 if (port) {
11191 #if defined(SCTP_WITH_NO_CSUM)
11192                         SCTP_STAT_INCR(sctps_sendnocrc);
11193 #else
11194                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11195                         SCTP_STAT_INCR(sctps_sendswcrc);
11196 #endif
11197                         if (V_udp_cksum) {
11198                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11199                         }
11200                 } else {
11201 #if defined(SCTP_WITH_NO_CSUM)
11202                         SCTP_STAT_INCR(sctps_sendnocrc);
11203 #else
11204                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11205                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11206                         SCTP_STAT_INCR(sctps_sendhwcrc);
11207 #endif
11208                 }
11209 #ifdef SCTP_PACKET_LOGGING
11210                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11211                         sctp_packet_log(o_pak);
11212                 }
11213 #endif
11214                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11215                 break;
11216 #endif
11217 #ifdef INET6
11218         case AF_INET6:
11219                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11220                 if (port) {
11221 #if defined(SCTP_WITH_NO_CSUM)
11222                         SCTP_STAT_INCR(sctps_sendnocrc);
11223 #else
11224                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11225                         SCTP_STAT_INCR(sctps_sendswcrc);
11226 #endif
11227                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11228                                 udp->uh_sum = 0xffff;
11229                         }
11230                 } else {
11231 #if defined(SCTP_WITH_NO_CSUM)
11232                         SCTP_STAT_INCR(sctps_sendnocrc);
11233 #else
11234                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11235                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11236                         SCTP_STAT_INCR(sctps_sendhwcrc);
11237 #endif
11238                 }
11239 #ifdef SCTP_PACKET_LOGGING
11240                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11241                         sctp_packet_log(o_pak);
11242                 }
11243 #endif
11244                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11245                 break;
11246 #endif
11247         default:
11248                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11249                     dst->sa_family);
11250                 sctp_m_freem(mout);
11251                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11252                 return;
11253         }
11254         SCTP_STAT_INCR(sctps_sendpackets);
11255         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11256         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11257         return;
11258 }
11259
11260 void
11261 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11262     struct sctphdr *sh,
11263     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11264     uint32_t vrf_id, uint16_t port)
11265 {
11266         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11267             mflowtype, mflowid, fibnum,
11268             vrf_id, port);
11269 }
11270
11271 void
11272 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11273 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11274     SCTP_UNUSED
11275 #endif
11276 )
11277 {
11278         struct sctp_tmit_chunk *chk;
11279         struct sctp_heartbeat_chunk *hb;
11280         struct timeval now;
11281
11282         SCTP_TCB_LOCK_ASSERT(stcb);
11283         if (net == NULL) {
11284                 return;
11285         }
11286         (void)SCTP_GETTIME_TIMEVAL(&now);
11287         switch (net->ro._l_addr.sa.sa_family) {
11288 #ifdef INET
11289         case AF_INET:
11290                 break;
11291 #endif
11292 #ifdef INET6
11293         case AF_INET6:
11294                 break;
11295 #endif
11296         default:
11297                 return;
11298         }
11299         sctp_alloc_a_chunk(stcb, chk);
11300         if (chk == NULL) {
11301                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11302                 return;
11303         }
11304         chk->copy_by_ref = 0;
11305         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11306         chk->rec.chunk_id.can_take_data = 1;
11307         chk->flags = 0;
11308         chk->asoc = &stcb->asoc;
11309         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11310
11311         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11312         if (chk->data == NULL) {
11313                 sctp_free_a_chunk(stcb, chk, so_locked);
11314                 return;
11315         }
11316         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11317         SCTP_BUF_LEN(chk->data) = chk->send_size;
11318         chk->sent = SCTP_DATAGRAM_UNSENT;
11319         chk->snd_count = 0;
11320         chk->whoTo = net;
11321         atomic_add_int(&chk->whoTo->ref_count, 1);
11322         /* Now we have a mbuf that we can fill in with the details */
11323         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11324         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11325         /* fill out chunk header */
11326         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11327         hb->ch.chunk_flags = 0;
11328         hb->ch.chunk_length = htons(chk->send_size);
11329         /* Fill out hb parameter */
11330         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11331         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11332         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11333         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11334         /* Did our user request this one, put it in */
11335         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11336         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11337         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11338                 /*
11339                  * we only take from the entropy pool if the address is not
11340                  * confirmed.
11341                  */
11342                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11343                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11344         } else {
11345                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11346                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11347         }
11348         switch (net->ro._l_addr.sa.sa_family) {
11349 #ifdef INET
11350         case AF_INET:
11351                 memcpy(hb->heartbeat.hb_info.address,
11352                     &net->ro._l_addr.sin.sin_addr,
11353                     sizeof(net->ro._l_addr.sin.sin_addr));
11354                 break;
11355 #endif
11356 #ifdef INET6
11357         case AF_INET6:
11358                 memcpy(hb->heartbeat.hb_info.address,
11359                     &net->ro._l_addr.sin6.sin6_addr,
11360                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11361                 break;
11362 #endif
11363         default:
11364                 if (chk->data) {
11365                         sctp_m_freem(chk->data);
11366                         chk->data = NULL;
11367                 }
11368                 sctp_free_a_chunk(stcb, chk, so_locked);
11369                 return;
11370                 break;
11371         }
11372         net->hb_responded = 0;
11373         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11374         stcb->asoc.ctrl_queue_cnt++;
11375         SCTP_STAT_INCR(sctps_sendheartbeat);
11376         return;
11377 }
11378
11379 void
11380 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11381     uint32_t high_tsn)
11382 {
11383         struct sctp_association *asoc;
11384         struct sctp_ecne_chunk *ecne;
11385         struct sctp_tmit_chunk *chk;
11386
11387         if (net == NULL) {
11388                 return;
11389         }
11390         asoc = &stcb->asoc;
11391         SCTP_TCB_LOCK_ASSERT(stcb);
11392         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11393                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11394                         /* found a previous ECN_ECHO update it if needed */
11395                         uint32_t cnt, ctsn;
11396
11397                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11398                         ctsn = ntohl(ecne->tsn);
11399                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11400                                 ecne->tsn = htonl(high_tsn);
11401                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11402                         }
11403                         cnt = ntohl(ecne->num_pkts_since_cwr);
11404                         cnt++;
11405                         ecne->num_pkts_since_cwr = htonl(cnt);
11406                         return;
11407                 }
11408         }
11409         /* nope could not find one to update so we must build one */
11410         sctp_alloc_a_chunk(stcb, chk);
11411         if (chk == NULL) {
11412                 return;
11413         }
11414         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11415         chk->copy_by_ref = 0;
11416         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11417         chk->rec.chunk_id.can_take_data = 0;
11418         chk->flags = 0;
11419         chk->asoc = &stcb->asoc;
11420         chk->send_size = sizeof(struct sctp_ecne_chunk);
11421         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11422         if (chk->data == NULL) {
11423                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11424                 return;
11425         }
11426         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11427         SCTP_BUF_LEN(chk->data) = chk->send_size;
11428         chk->sent = SCTP_DATAGRAM_UNSENT;
11429         chk->snd_count = 0;
11430         chk->whoTo = net;
11431         atomic_add_int(&chk->whoTo->ref_count, 1);
11432
11433         stcb->asoc.ecn_echo_cnt_onq++;
11434         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11435         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11436         ecne->ch.chunk_flags = 0;
11437         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11438         ecne->tsn = htonl(high_tsn);
11439         ecne->num_pkts_since_cwr = htonl(1);
11440         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11441         asoc->ctrl_queue_cnt++;
11442 }
11443
11444 void
11445 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11446     struct mbuf *m, int len, int iphlen, int bad_crc)
11447 {
11448         struct sctp_association *asoc;
11449         struct sctp_pktdrop_chunk *drp;
11450         struct sctp_tmit_chunk *chk;
11451         uint8_t *datap;
11452         int was_trunc = 0;
11453         int fullsz = 0;
11454         long spc;
11455         int offset;
11456         struct sctp_chunkhdr *ch, chunk_buf;
11457         unsigned int chk_length;
11458
11459         if (!stcb) {
11460                 return;
11461         }
11462         asoc = &stcb->asoc;
11463         SCTP_TCB_LOCK_ASSERT(stcb);
11464         if (asoc->pktdrop_supported == 0) {
11465                 /*-
11466                  * peer must declare support before I send one.
11467                  */
11468                 return;
11469         }
11470         if (stcb->sctp_socket == NULL) {
11471                 return;
11472         }
11473         sctp_alloc_a_chunk(stcb, chk);
11474         if (chk == NULL) {
11475                 return;
11476         }
11477         chk->copy_by_ref = 0;
11478         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11479         chk->rec.chunk_id.can_take_data = 1;
11480         chk->flags = 0;
11481         len -= iphlen;
11482         chk->send_size = len;
11483         /* Validate that we do not have an ABORT in here. */
11484         offset = iphlen + sizeof(struct sctphdr);
11485         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11486             sizeof(*ch), (uint8_t *)&chunk_buf);
11487         while (ch != NULL) {
11488                 chk_length = ntohs(ch->chunk_length);
11489                 if (chk_length < sizeof(*ch)) {
11490                         /* break to abort land */
11491                         break;
11492                 }
11493                 switch (ch->chunk_type) {
11494                 case SCTP_PACKET_DROPPED:
11495                 case SCTP_ABORT_ASSOCIATION:
11496                 case SCTP_INITIATION_ACK:
11497                         /**
11498                          * We don't respond with an PKT-DROP to an ABORT
11499                          * or PKT-DROP. We also do not respond to an
11500                          * INIT-ACK, because we can't know if the initiation
11501                          * tag is correct or not.
11502                          */
11503                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11504                         return;
11505                 default:
11506                         break;
11507                 }
11508                 offset += SCTP_SIZE32(chk_length);
11509                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11510                     sizeof(*ch), (uint8_t *)&chunk_buf);
11511         }
11512
11513         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11514             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11515                 /*
11516                  * only send 1 mtu worth, trim off the excess on the end.
11517                  */
11518                 fullsz = len;
11519                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11520                 was_trunc = 1;
11521         }
11522         chk->asoc = &stcb->asoc;
11523         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11524         if (chk->data == NULL) {
11525 jump_out:
11526                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11527                 return;
11528         }
11529         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11530         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11531         if (drp == NULL) {
11532                 sctp_m_freem(chk->data);
11533                 chk->data = NULL;
11534                 goto jump_out;
11535         }
11536         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11537             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11538         chk->book_size_scale = 0;
11539         if (was_trunc) {
11540                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11541                 drp->trunc_len = htons(fullsz);
11542                 /*
11543                  * Len is already adjusted to size minus overhead above take
11544                  * out the pkt_drop chunk itself from it.
11545                  */
11546                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11547                 len = chk->send_size;
11548         } else {
11549                 /* no truncation needed */
11550                 drp->ch.chunk_flags = 0;
11551                 drp->trunc_len = htons(0);
11552         }
11553         if (bad_crc) {
11554                 drp->ch.chunk_flags |= SCTP_BADCRC;
11555         }
11556         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11557         SCTP_BUF_LEN(chk->data) = chk->send_size;
11558         chk->sent = SCTP_DATAGRAM_UNSENT;
11559         chk->snd_count = 0;
11560         if (net) {
11561                 /* we should hit here */
11562                 chk->whoTo = net;
11563                 atomic_add_int(&chk->whoTo->ref_count, 1);
11564         } else {
11565                 chk->whoTo = NULL;
11566         }
11567         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11568         drp->ch.chunk_length = htons(chk->send_size);
11569         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11570         if (spc < 0) {
11571                 spc = 0;
11572         }
11573         drp->bottle_bw = htonl(spc);
11574         if (asoc->my_rwnd) {
11575                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11576                     asoc->size_on_all_streams +
11577                     asoc->my_rwnd_control_len +
11578                     stcb->sctp_socket->so_rcv.sb_cc);
11579         } else {
11580                 /*-
11581                  * If my rwnd is 0, possibly from mbuf depletion as well as
11582                  * space used, tell the peer there is NO space aka onq == bw
11583                  */
11584                 drp->current_onq = htonl(spc);
11585         }
11586         drp->reserved = 0;
11587         datap = drp->data;
11588         m_copydata(m, iphlen, len, (caddr_t)datap);
11589         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11590         asoc->ctrl_queue_cnt++;
11591 }
11592
11593 void
11594 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11595 {
11596         struct sctp_association *asoc;
11597         struct sctp_cwr_chunk *cwr;
11598         struct sctp_tmit_chunk *chk;
11599
11600         SCTP_TCB_LOCK_ASSERT(stcb);
11601         if (net == NULL) {
11602                 return;
11603         }
11604         asoc = &stcb->asoc;
11605         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11606                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11607                         /*
11608                          * found a previous CWR queued to same destination
11609                          * update it if needed
11610                          */
11611                         uint32_t ctsn;
11612
11613                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11614                         ctsn = ntohl(cwr->tsn);
11615                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11616                                 cwr->tsn = htonl(high_tsn);
11617                         }
11618                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11619                                 /* Make sure override is carried */
11620                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11621                         }
11622                         return;
11623                 }
11624         }
11625         sctp_alloc_a_chunk(stcb, chk);
11626         if (chk == NULL) {
11627                 return;
11628         }
11629         chk->copy_by_ref = 0;
11630         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11631         chk->rec.chunk_id.can_take_data = 1;
11632         chk->flags = 0;
11633         chk->asoc = &stcb->asoc;
11634         chk->send_size = sizeof(struct sctp_cwr_chunk);
11635         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11636         if (chk->data == NULL) {
11637                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11638                 return;
11639         }
11640         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11641         SCTP_BUF_LEN(chk->data) = chk->send_size;
11642         chk->sent = SCTP_DATAGRAM_UNSENT;
11643         chk->snd_count = 0;
11644         chk->whoTo = net;
11645         atomic_add_int(&chk->whoTo->ref_count, 1);
11646         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11647         cwr->ch.chunk_type = SCTP_ECN_CWR;
11648         cwr->ch.chunk_flags = override;
11649         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11650         cwr->tsn = htonl(high_tsn);
11651         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11652         asoc->ctrl_queue_cnt++;
11653 }
11654
11655 static int
11656 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11657     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11658 {
11659         uint16_t len, old_len, i;
11660         struct sctp_stream_reset_out_request *req_out;
11661         struct sctp_chunkhdr *ch;
11662         int at;
11663         int number_entries = 0;
11664
11665         ch = mtod(chk->data, struct sctp_chunkhdr *);
11666         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11667         /* get to new offset for the param. */
11668         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11669         /* now how long will this param be? */
11670         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11671                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11672                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11673                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11674                         number_entries++;
11675                 }
11676         }
11677         if (number_entries == 0) {
11678                 return (0);
11679         }
11680         if (number_entries == stcb->asoc.streamoutcnt) {
11681                 number_entries = 0;
11682         }
11683         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11684                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11685         }
11686         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11687         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11688         req_out->ph.param_length = htons(len);
11689         req_out->request_seq = htonl(seq);
11690         req_out->response_seq = htonl(resp_seq);
11691         req_out->send_reset_at_tsn = htonl(last_sent);
11692         at = 0;
11693         if (number_entries) {
11694                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11695                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11696                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11697                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11698                                 req_out->list_of_streams[at] = htons(i);
11699                                 at++;
11700                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11701                                 if (at >= number_entries) {
11702                                         break;
11703                                 }
11704                         }
11705                 }
11706         } else {
11707                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11708                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11709                 }
11710         }
11711         if (SCTP_SIZE32(len) > len) {
11712                 /*-
11713                  * Need to worry about the pad we may end up adding to the
11714                  * end. This is easy since the struct is either aligned to 4
11715                  * bytes or 2 bytes off.
11716                  */
11717                 req_out->list_of_streams[number_entries] = 0;
11718         }
11719         /* now fix the chunk length */
11720         ch->chunk_length = htons(len + old_len);
11721         chk->book_size = len + old_len;
11722         chk->book_size_scale = 0;
11723         chk->send_size = SCTP_SIZE32(chk->book_size);
11724         SCTP_BUF_LEN(chk->data) = chk->send_size;
11725         return (1);
11726 }
11727
11728 static void
11729 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11730     int number_entries, uint16_t *list,
11731     uint32_t seq)
11732 {
11733         uint16_t len, old_len, i;
11734         struct sctp_stream_reset_in_request *req_in;
11735         struct sctp_chunkhdr *ch;
11736
11737         ch = mtod(chk->data, struct sctp_chunkhdr *);
11738         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11739
11740         /* get to new offset for the param. */
11741         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11742         /* now how long will this param be? */
11743         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11744         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11745         req_in->ph.param_length = htons(len);
11746         req_in->request_seq = htonl(seq);
11747         if (number_entries) {
11748                 for (i = 0; i < number_entries; i++) {
11749                         req_in->list_of_streams[i] = htons(list[i]);
11750                 }
11751         }
11752         if (SCTP_SIZE32(len) > len) {
11753                 /*-
11754                  * Need to worry about the pad we may end up adding to the
11755                  * end. This is easy since the struct is either aligned to 4
11756                  * bytes or 2 bytes off.
11757                  */
11758                 req_in->list_of_streams[number_entries] = 0;
11759         }
11760         /* now fix the chunk length */
11761         ch->chunk_length = htons(len + old_len);
11762         chk->book_size = len + old_len;
11763         chk->book_size_scale = 0;
11764         chk->send_size = SCTP_SIZE32(chk->book_size);
11765         SCTP_BUF_LEN(chk->data) = chk->send_size;
11766         return;
11767 }
11768
11769 static void
11770 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11771     uint32_t seq)
11772 {
11773         uint16_t len, old_len;
11774         struct sctp_stream_reset_tsn_request *req_tsn;
11775         struct sctp_chunkhdr *ch;
11776
11777         ch = mtod(chk->data, struct sctp_chunkhdr *);
11778         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11779
11780         /* get to new offset for the param. */
11781         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11782         /* now how long will this param be? */
11783         len = sizeof(struct sctp_stream_reset_tsn_request);
11784         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11785         req_tsn->ph.param_length = htons(len);
11786         req_tsn->request_seq = htonl(seq);
11787
11788         /* now fix the chunk length */
11789         ch->chunk_length = htons(len + old_len);
11790         chk->send_size = len + old_len;
11791         chk->book_size = SCTP_SIZE32(chk->send_size);
11792         chk->book_size_scale = 0;
11793         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11794         return;
11795 }
11796
11797 void
11798 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11799     uint32_t resp_seq, uint32_t result)
11800 {
11801         uint16_t len, old_len;
11802         struct sctp_stream_reset_response *resp;
11803         struct sctp_chunkhdr *ch;
11804
11805         ch = mtod(chk->data, struct sctp_chunkhdr *);
11806         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11807
11808         /* get to new offset for the param. */
11809         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11810         /* now how long will this param be? */
11811         len = sizeof(struct sctp_stream_reset_response);
11812         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11813         resp->ph.param_length = htons(len);
11814         resp->response_seq = htonl(resp_seq);
11815         resp->result = ntohl(result);
11816
11817         /* now fix the chunk length */
11818         ch->chunk_length = htons(len + old_len);
11819         chk->book_size = len + old_len;
11820         chk->book_size_scale = 0;
11821         chk->send_size = SCTP_SIZE32(chk->book_size);
11822         SCTP_BUF_LEN(chk->data) = chk->send_size;
11823         return;
11824 }
11825
11826 void
11827 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11828     struct sctp_stream_reset_list *ent,
11829     int response)
11830 {
11831         struct sctp_association *asoc;
11832         struct sctp_tmit_chunk *chk;
11833         struct sctp_chunkhdr *ch;
11834
11835         asoc = &stcb->asoc;
11836
11837         /*
11838          * Reset our last reset action to the new one IP -> response
11839          * (PERFORMED probably). This assures that if we fail to send, a
11840          * retran from the peer will get the new response.
11841          */
11842         asoc->last_reset_action[0] = response;
11843         if (asoc->stream_reset_outstanding) {
11844                 return;
11845         }
11846         sctp_alloc_a_chunk(stcb, chk);
11847         if (chk == NULL) {
11848                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11849                 return;
11850         }
11851         chk->copy_by_ref = 0;
11852         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11853         chk->rec.chunk_id.can_take_data = 0;
11854         chk->flags = 0;
11855         chk->asoc = &stcb->asoc;
11856         chk->book_size = sizeof(struct sctp_chunkhdr);
11857         chk->send_size = SCTP_SIZE32(chk->book_size);
11858         chk->book_size_scale = 0;
11859         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11860         if (chk->data == NULL) {
11861                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11862                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11863                 return;
11864         }
11865         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11866         /* setup chunk parameters */
11867         chk->sent = SCTP_DATAGRAM_UNSENT;
11868         chk->snd_count = 0;
11869         if (stcb->asoc.alternate) {
11870                 chk->whoTo = stcb->asoc.alternate;
11871         } else {
11872                 chk->whoTo = stcb->asoc.primary_destination;
11873         }
11874         ch = mtod(chk->data, struct sctp_chunkhdr *);
11875         ch->chunk_type = SCTP_STREAM_RESET;
11876         ch->chunk_flags = 0;
11877         ch->chunk_length = htons(chk->book_size);
11878         atomic_add_int(&chk->whoTo->ref_count, 1);
11879         SCTP_BUF_LEN(chk->data) = chk->send_size;
11880         sctp_add_stream_reset_result(chk, ent->seq, response);
11881         /* insert the chunk for sending */
11882         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11883             chk,
11884             sctp_next);
11885         asoc->ctrl_queue_cnt++;
11886 }
11887
11888 void
11889 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11890     uint32_t resp_seq, uint32_t result,
11891     uint32_t send_una, uint32_t recv_next)
11892 {
11893         uint16_t len, old_len;
11894         struct sctp_stream_reset_response_tsn *resp;
11895         struct sctp_chunkhdr *ch;
11896
11897         ch = mtod(chk->data, struct sctp_chunkhdr *);
11898         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11899
11900         /* get to new offset for the param. */
11901         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11902         /* now how long will this param be? */
11903         len = sizeof(struct sctp_stream_reset_response_tsn);
11904         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11905         resp->ph.param_length = htons(len);
11906         resp->response_seq = htonl(resp_seq);
11907         resp->result = htonl(result);
11908         resp->senders_next_tsn = htonl(send_una);
11909         resp->receivers_next_tsn = htonl(recv_next);
11910
11911         /* now fix the chunk length */
11912         ch->chunk_length = htons(len + old_len);
11913         chk->book_size = len + old_len;
11914         chk->send_size = SCTP_SIZE32(chk->book_size);
11915         chk->book_size_scale = 0;
11916         SCTP_BUF_LEN(chk->data) = chk->send_size;
11917         return;
11918 }
11919
11920 static void
11921 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11922     uint32_t seq,
11923     uint16_t adding)
11924 {
11925         uint16_t len, old_len;
11926         struct sctp_chunkhdr *ch;
11927         struct sctp_stream_reset_add_strm *addstr;
11928
11929         ch = mtod(chk->data, struct sctp_chunkhdr *);
11930         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11931
11932         /* get to new offset for the param. */
11933         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11934         /* now how long will this param be? */
11935         len = sizeof(struct sctp_stream_reset_add_strm);
11936
11937         /* Fill it out. */
11938         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11939         addstr->ph.param_length = htons(len);
11940         addstr->request_seq = htonl(seq);
11941         addstr->number_of_streams = htons(adding);
11942         addstr->reserved = 0;
11943
11944         /* now fix the chunk length */
11945         ch->chunk_length = htons(len + old_len);
11946         chk->send_size = len + old_len;
11947         chk->book_size = SCTP_SIZE32(chk->send_size);
11948         chk->book_size_scale = 0;
11949         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11950         return;
11951 }
11952
11953 static void
11954 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11955     uint32_t seq,
11956     uint16_t adding)
11957 {
11958         uint16_t len, old_len;
11959         struct sctp_chunkhdr *ch;
11960         struct sctp_stream_reset_add_strm *addstr;
11961
11962         ch = mtod(chk->data, struct sctp_chunkhdr *);
11963         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11964
11965         /* get to new offset for the param. */
11966         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11967         /* now how long will this param be? */
11968         len = sizeof(struct sctp_stream_reset_add_strm);
11969         /* Fill it out. */
11970         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11971         addstr->ph.param_length = htons(len);
11972         addstr->request_seq = htonl(seq);
11973         addstr->number_of_streams = htons(adding);
11974         addstr->reserved = 0;
11975
11976         /* now fix the chunk length */
11977         ch->chunk_length = htons(len + old_len);
11978         chk->send_size = len + old_len;
11979         chk->book_size = SCTP_SIZE32(chk->send_size);
11980         chk->book_size_scale = 0;
11981         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11982         return;
11983 }
11984
11985 int
11986 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11987 {
11988         struct sctp_association *asoc;
11989         struct sctp_tmit_chunk *chk;
11990         struct sctp_chunkhdr *ch;
11991         uint32_t seq;
11992
11993         asoc = &stcb->asoc;
11994         asoc->trigger_reset = 0;
11995         if (asoc->stream_reset_outstanding) {
11996                 return (EALREADY);
11997         }
11998         sctp_alloc_a_chunk(stcb, chk);
11999         if (chk == NULL) {
12000                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12001                 return (ENOMEM);
12002         }
12003         chk->copy_by_ref = 0;
12004         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12005         chk->rec.chunk_id.can_take_data = 0;
12006         chk->flags = 0;
12007         chk->asoc = &stcb->asoc;
12008         chk->book_size = sizeof(struct sctp_chunkhdr);
12009         chk->send_size = SCTP_SIZE32(chk->book_size);
12010         chk->book_size_scale = 0;
12011         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12012         if (chk->data == NULL) {
12013                 sctp_free_a_chunk(stcb, chk, so_locked);
12014                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12015                 return (ENOMEM);
12016         }
12017         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12018
12019         /* setup chunk parameters */
12020         chk->sent = SCTP_DATAGRAM_UNSENT;
12021         chk->snd_count = 0;
12022         if (stcb->asoc.alternate) {
12023                 chk->whoTo = stcb->asoc.alternate;
12024         } else {
12025                 chk->whoTo = stcb->asoc.primary_destination;
12026         }
12027         ch = mtod(chk->data, struct sctp_chunkhdr *);
12028         ch->chunk_type = SCTP_STREAM_RESET;
12029         ch->chunk_flags = 0;
12030         ch->chunk_length = htons(chk->book_size);
12031         atomic_add_int(&chk->whoTo->ref_count, 1);
12032         SCTP_BUF_LEN(chk->data) = chk->send_size;
12033         seq = stcb->asoc.str_reset_seq_out;
12034         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12035                 seq++;
12036                 asoc->stream_reset_outstanding++;
12037         } else {
12038                 m_freem(chk->data);
12039                 chk->data = NULL;
12040                 sctp_free_a_chunk(stcb, chk, so_locked);
12041                 return (ENOENT);
12042         }
12043         asoc->str_reset = chk;
12044         /* insert the chunk for sending */
12045         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12046             chk,
12047             sctp_next);
12048         asoc->ctrl_queue_cnt++;
12049
12050         if (stcb->asoc.send_sack) {
12051                 sctp_send_sack(stcb, so_locked);
12052         }
12053         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12054         return (0);
12055 }
12056
12057 int
12058 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12059     uint16_t number_entries, uint16_t *list,
12060     uint8_t send_in_req,
12061     uint8_t send_tsn_req,
12062     uint8_t add_stream,
12063     uint16_t adding_o,
12064     uint16_t adding_i, uint8_t peer_asked)
12065 {
12066         struct sctp_association *asoc;
12067         struct sctp_tmit_chunk *chk;
12068         struct sctp_chunkhdr *ch;
12069         int can_send_out_req = 0;
12070         uint32_t seq;
12071
12072         asoc = &stcb->asoc;
12073         if (asoc->stream_reset_outstanding) {
12074                 /*-
12075                  * Already one pending, must get ACK back to clear the flag.
12076                  */
12077                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12078                 return (EBUSY);
12079         }
12080         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12081             (add_stream == 0)) {
12082                 /* nothing to do */
12083                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12084                 return (EINVAL);
12085         }
12086         if (send_tsn_req && send_in_req) {
12087                 /* error, can't do that */
12088                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12089                 return (EINVAL);
12090         } else if (send_in_req) {
12091                 can_send_out_req = 1;
12092         }
12093         if (number_entries > (MCLBYTES -
12094             SCTP_MIN_OVERHEAD -
12095             sizeof(struct sctp_chunkhdr) -
12096             sizeof(struct sctp_stream_reset_out_request)) /
12097             sizeof(uint16_t)) {
12098                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12099                 return (ENOMEM);
12100         }
12101         sctp_alloc_a_chunk(stcb, chk);
12102         if (chk == NULL) {
12103                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12104                 return (ENOMEM);
12105         }
12106         chk->copy_by_ref = 0;
12107         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12108         chk->rec.chunk_id.can_take_data = 0;
12109         chk->flags = 0;
12110         chk->asoc = &stcb->asoc;
12111         chk->book_size = sizeof(struct sctp_chunkhdr);
12112         chk->send_size = SCTP_SIZE32(chk->book_size);
12113         chk->book_size_scale = 0;
12114
12115         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12116         if (chk->data == NULL) {
12117                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12118                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12119                 return (ENOMEM);
12120         }
12121         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12122
12123         /* setup chunk parameters */
12124         chk->sent = SCTP_DATAGRAM_UNSENT;
12125         chk->snd_count = 0;
12126         if (stcb->asoc.alternate) {
12127                 chk->whoTo = stcb->asoc.alternate;
12128         } else {
12129                 chk->whoTo = stcb->asoc.primary_destination;
12130         }
12131         atomic_add_int(&chk->whoTo->ref_count, 1);
12132         ch = mtod(chk->data, struct sctp_chunkhdr *);
12133         ch->chunk_type = SCTP_STREAM_RESET;
12134         ch->chunk_flags = 0;
12135         ch->chunk_length = htons(chk->book_size);
12136         SCTP_BUF_LEN(chk->data) = chk->send_size;
12137
12138         seq = stcb->asoc.str_reset_seq_out;
12139         if (can_send_out_req) {
12140                 int ret;
12141
12142                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12143                 if (ret) {
12144                         seq++;
12145                         asoc->stream_reset_outstanding++;
12146                 }
12147         }
12148         if ((add_stream & 1) &&
12149             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12150                 /* Need to allocate more */
12151                 struct sctp_stream_out *oldstream;
12152                 struct sctp_stream_queue_pending *sp, *nsp;
12153                 int i;
12154 #if defined(SCTP_DETAILED_STR_STATS)
12155                 int j;
12156 #endif
12157
12158                 oldstream = stcb->asoc.strmout;
12159                 /* get some more */
12160                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12161                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12162                     SCTP_M_STRMO);
12163                 if (stcb->asoc.strmout == NULL) {
12164                         uint8_t x;
12165
12166                         stcb->asoc.strmout = oldstream;
12167                         /* Turn off the bit */
12168                         x = add_stream & 0xfe;
12169                         add_stream = x;
12170                         goto skip_stuff;
12171                 }
12172                 /*
12173                  * Ok now we proceed with copying the old out stuff and
12174                  * initializing the new stuff.
12175                  */
12176                 SCTP_TCB_SEND_LOCK(stcb);
12177                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12178                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12179                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12180                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12181                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12182                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12183                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12184                         stcb->asoc.strmout[i].sid = i;
12185                         stcb->asoc.strmout[i].state = oldstream[i].state;
12186                         /* FIX ME FIX ME */
12187                         /*
12188                          * This should be a SS_COPY operation FIX ME STREAM
12189                          * SCHEDULER EXPERT
12190                          */
12191                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12192                         /* now anything on those queues? */
12193                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12194                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12195                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12196                         }
12197
12198                 }
12199                 /* now the new streams */
12200                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12201                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12202                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12203                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12204 #if defined(SCTP_DETAILED_STR_STATS)
12205                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12206                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12207                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12208                         }
12209 #else
12210                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12211                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12212 #endif
12213                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12214                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12215                         stcb->asoc.strmout[i].sid = i;
12216                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12217                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12218                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12219                 }
12220                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12221                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12222                 SCTP_TCB_SEND_UNLOCK(stcb);
12223         }
12224 skip_stuff:
12225         if ((add_stream & 1) && (adding_o > 0)) {
12226                 asoc->strm_pending_add_size = adding_o;
12227                 asoc->peer_req_out = peer_asked;
12228                 sctp_add_an_out_stream(chk, seq, adding_o);
12229                 seq++;
12230                 asoc->stream_reset_outstanding++;
12231         }
12232         if ((add_stream & 2) && (adding_i > 0)) {
12233                 sctp_add_an_in_stream(chk, seq, adding_i);
12234                 seq++;
12235                 asoc->stream_reset_outstanding++;
12236         }
12237         if (send_in_req) {
12238                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12239                 seq++;
12240                 asoc->stream_reset_outstanding++;
12241         }
12242         if (send_tsn_req) {
12243                 sctp_add_stream_reset_tsn(chk, seq);
12244                 asoc->stream_reset_outstanding++;
12245         }
12246         asoc->str_reset = chk;
12247         /* insert the chunk for sending */
12248         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12249             chk,
12250             sctp_next);
12251         asoc->ctrl_queue_cnt++;
12252         if (stcb->asoc.send_sack) {
12253                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12254         }
12255         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12256         return (0);
12257 }
12258
12259 void
12260 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12261     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12262     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12263     uint32_t vrf_id, uint16_t port)
12264 {
12265         /* Don't respond to an ABORT with an ABORT. */
12266         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12267                 if (cause)
12268                         sctp_m_freem(cause);
12269                 return;
12270         }
12271         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12272             mflowtype, mflowid, fibnum,
12273             vrf_id, port);
12274         return;
12275 }
12276
12277 void
12278 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12279     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12280     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12281     uint32_t vrf_id, uint16_t port)
12282 {
12283         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12284             mflowtype, mflowid, fibnum,
12285             vrf_id, port);
12286         return;
12287 }
12288
12289 static struct mbuf *
12290 sctp_copy_resume(struct uio *uio,
12291     int max_send_len,
12292     int user_marks_eor,
12293     int *error,
12294     uint32_t *sndout,
12295     struct mbuf **new_tail)
12296 {
12297         struct mbuf *m;
12298
12299         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12300             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12301         if (m == NULL) {
12302                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12303                 *error = ENOBUFS;
12304         } else {
12305                 *sndout = m_length(m, NULL);
12306                 *new_tail = m_last(m);
12307         }
12308         return (m);
12309 }
12310
12311 static int
12312 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12313     struct uio *uio,
12314     int resv_upfront)
12315 {
12316         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12317             resv_upfront, 0);
12318         if (sp->data == NULL) {
12319                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12320                 return (ENOBUFS);
12321         }
12322         sp->tail_mbuf = m_last(sp->data);
12323         return (0);
12324 }
12325
12326
12327
12328 static struct sctp_stream_queue_pending *
12329 sctp_copy_it_in(struct sctp_tcb *stcb,
12330     struct sctp_association *asoc,
12331     struct sctp_sndrcvinfo *srcv,
12332     struct uio *uio,
12333     struct sctp_nets *net,
12334     int max_send_len,
12335     int user_marks_eor,
12336     int *error)
12337 {
12338         /*-
12339          * This routine must be very careful in its work. Protocol
12340          * processing is up and running so care must be taken to spl...()
12341          * when you need to do something that may effect the stcb/asoc. The
12342          * sb is locked however. When data is copied the protocol processing
12343          * should be enabled since this is a slower operation...
12344          */
12345         struct sctp_stream_queue_pending *sp = NULL;
12346         int resv_in_first;
12347
12348         *error = 0;
12349         /* Now can we send this? */
12350         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12351             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12352             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12353             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12354                 /* got data while shutting down */
12355                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12356                 *error = ECONNRESET;
12357                 goto out_now;
12358         }
12359         sctp_alloc_a_strmoq(stcb, sp);
12360         if (sp == NULL) {
12361                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12362                 *error = ENOMEM;
12363                 goto out_now;
12364         }
12365         sp->act_flags = 0;
12366         sp->sender_all_done = 0;
12367         sp->sinfo_flags = srcv->sinfo_flags;
12368         sp->timetolive = srcv->sinfo_timetolive;
12369         sp->ppid = srcv->sinfo_ppid;
12370         sp->context = srcv->sinfo_context;
12371         sp->fsn = 0;
12372         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12373
12374         sp->sid = srcv->sinfo_stream;
12375         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12376         if ((sp->length == (uint32_t)uio->uio_resid) &&
12377             ((user_marks_eor == 0) ||
12378             (srcv->sinfo_flags & SCTP_EOF) ||
12379             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12380                 sp->msg_is_complete = 1;
12381         } else {
12382                 sp->msg_is_complete = 0;
12383         }
12384         sp->sender_all_done = 0;
12385         sp->some_taken = 0;
12386         sp->put_last_out = 0;
12387         resv_in_first = sizeof(struct sctp_data_chunk);
12388         sp->data = sp->tail_mbuf = NULL;
12389         if (sp->length == 0) {
12390                 *error = 0;
12391                 goto skip_copy;
12392         }
12393         if (srcv->sinfo_keynumber_valid) {
12394                 sp->auth_keyid = srcv->sinfo_keynumber;
12395         } else {
12396                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12397         }
12398         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12399                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12400                 sp->holds_key_ref = 1;
12401         }
12402         *error = sctp_copy_one(sp, uio, resv_in_first);
12403 skip_copy:
12404         if (*error) {
12405                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12406                 sp = NULL;
12407         } else {
12408                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12409                         sp->net = net;
12410                         atomic_add_int(&sp->net->ref_count, 1);
12411                 } else {
12412                         sp->net = NULL;
12413                 }
12414                 sctp_set_prsctp_policy(sp);
12415         }
12416 out_now:
12417         return (sp);
12418 }
12419
12420
12421 int
12422 sctp_sosend(struct socket *so,
12423     struct sockaddr *addr,
12424     struct uio *uio,
12425     struct mbuf *top,
12426     struct mbuf *control,
12427     int flags,
12428     struct thread *p
12429 )
12430 {
12431         int error, use_sndinfo = 0;
12432         struct sctp_sndrcvinfo sndrcvninfo;
12433         struct sockaddr *addr_to_use;
12434 #if defined(INET) && defined(INET6)
12435         struct sockaddr_in sin;
12436 #endif
12437
12438         if (control) {
12439                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12440                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12441                     sizeof(sndrcvninfo))) {
12442                         /* got one */
12443                         use_sndinfo = 1;
12444                 }
12445         }
12446         addr_to_use = addr;
12447 #if defined(INET) && defined(INET6)
12448         if ((addr) && (addr->sa_family == AF_INET6)) {
12449                 struct sockaddr_in6 *sin6;
12450
12451                 sin6 = (struct sockaddr_in6 *)addr;
12452                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12453                         in6_sin6_2_sin(&sin, sin6);
12454                         addr_to_use = (struct sockaddr *)&sin;
12455                 }
12456         }
12457 #endif
12458         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12459             control,
12460             flags,
12461             use_sndinfo ? &sndrcvninfo : NULL
12462             ,p
12463             );
12464         return (error);
12465 }
12466
12467
12468 int
12469 sctp_lower_sosend(struct socket *so,
12470     struct sockaddr *addr,
12471     struct uio *uio,
12472     struct mbuf *i_pak,
12473     struct mbuf *control,
12474     int flags,
12475     struct sctp_sndrcvinfo *srcv
12476     ,
12477     struct thread *p
12478 )
12479 {
12480         unsigned int sndlen = 0, max_len;
12481         int error, len;
12482         struct mbuf *top = NULL;
12483         int queue_only = 0, queue_only_for_init = 0;
12484         int free_cnt_applied = 0;
12485         int un_sent;
12486         int now_filled = 0;
12487         unsigned int inqueue_bytes = 0;
12488         struct sctp_block_entry be;
12489         struct sctp_inpcb *inp;
12490         struct sctp_tcb *stcb = NULL;
12491         struct timeval now;
12492         struct sctp_nets *net;
12493         struct sctp_association *asoc;
12494         struct sctp_inpcb *t_inp;
12495         int user_marks_eor;
12496         int create_lock_applied = 0;
12497         int nagle_applies = 0;
12498         int some_on_control = 0;
12499         int got_all_of_the_send = 0;
12500         int hold_tcblock = 0;
12501         int non_blocking = 0;
12502         uint32_t local_add_more, local_soresv = 0;
12503         uint16_t port;
12504         uint16_t sinfo_flags;
12505         sctp_assoc_t sinfo_assoc_id;
12506
12507         error = 0;
12508         net = NULL;
12509         stcb = NULL;
12510         asoc = NULL;
12511
12512         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12513         if (inp == NULL) {
12514                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12515                 error = EINVAL;
12516                 if (i_pak) {
12517                         SCTP_RELEASE_PKT(i_pak);
12518                 }
12519                 return (error);
12520         }
12521         if ((uio == NULL) && (i_pak == NULL)) {
12522                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12523                 return (EINVAL);
12524         }
12525         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12526         atomic_add_int(&inp->total_sends, 1);
12527         if (uio) {
12528                 if (uio->uio_resid < 0) {
12529                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12530                         return (EINVAL);
12531                 }
12532                 sndlen = (unsigned int)uio->uio_resid;
12533         } else {
12534                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12535                 sndlen = SCTP_HEADER_LEN(i_pak);
12536         }
12537         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12538             (void *)addr,
12539             sndlen);
12540         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12541             (inp->sctp_socket->so_qlimit)) {
12542                 /* The listener can NOT send */
12543                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12544                 error = ENOTCONN;
12545                 goto out_unlocked;
12546         }
12547         /**
12548          * Pre-screen address, if one is given the sin-len
12549          * must be set correctly!
12550          */
12551         if (addr) {
12552                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12553
12554                 switch (raddr->sa.sa_family) {
12555 #ifdef INET
12556                 case AF_INET:
12557                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12558                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12559                                 error = EINVAL;
12560                                 goto out_unlocked;
12561                         }
12562                         port = raddr->sin.sin_port;
12563                         break;
12564 #endif
12565 #ifdef INET6
12566                 case AF_INET6:
12567                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12568                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12569                                 error = EINVAL;
12570                                 goto out_unlocked;
12571                         }
12572                         port = raddr->sin6.sin6_port;
12573                         break;
12574 #endif
12575                 default:
12576                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12577                         error = EAFNOSUPPORT;
12578                         goto out_unlocked;
12579                 }
12580         } else
12581                 port = 0;
12582
12583         if (srcv) {
12584                 sinfo_flags = srcv->sinfo_flags;
12585                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12586                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12587                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12588                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12589                         error = EINVAL;
12590                         goto out_unlocked;
12591                 }
12592                 if (srcv->sinfo_flags)
12593                         SCTP_STAT_INCR(sctps_sends_with_flags);
12594         } else {
12595                 sinfo_flags = inp->def_send.sinfo_flags;
12596                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12597         }
12598         if (sinfo_flags & SCTP_SENDALL) {
12599                 /* its a sendall */
12600                 error = sctp_sendall(inp, uio, top, srcv);
12601                 top = NULL;
12602                 goto out_unlocked;
12603         }
12604         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12605                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606                 error = EINVAL;
12607                 goto out_unlocked;
12608         }
12609         /* now we must find the assoc */
12610         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12611             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12612                 SCTP_INP_RLOCK(inp);
12613                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12614                 if (stcb) {
12615                         SCTP_TCB_LOCK(stcb);
12616                         hold_tcblock = 1;
12617                 }
12618                 SCTP_INP_RUNLOCK(inp);
12619         } else if (sinfo_assoc_id) {
12620                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12621                 if (stcb != NULL) {
12622                         hold_tcblock = 1;
12623                 }
12624         } else if (addr) {
12625                 /*-
12626                  * Since we did not use findep we must
12627                  * increment it, and if we don't find a tcb
12628                  * decrement it.
12629                  */
12630                 SCTP_INP_WLOCK(inp);
12631                 SCTP_INP_INCR_REF(inp);
12632                 SCTP_INP_WUNLOCK(inp);
12633                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12634                 if (stcb == NULL) {
12635                         SCTP_INP_WLOCK(inp);
12636                         SCTP_INP_DECR_REF(inp);
12637                         SCTP_INP_WUNLOCK(inp);
12638                 } else {
12639                         hold_tcblock = 1;
12640                 }
12641         }
12642         if ((stcb == NULL) && (addr)) {
12643                 /* Possible implicit send? */
12644                 SCTP_ASOC_CREATE_LOCK(inp);
12645                 create_lock_applied = 1;
12646                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12647                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12648                         /* Should I really unlock ? */
12649                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12650                         error = EINVAL;
12651                         goto out_unlocked;
12652
12653                 }
12654                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12655                     (addr->sa_family == AF_INET6)) {
12656                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12657                         error = EINVAL;
12658                         goto out_unlocked;
12659                 }
12660                 SCTP_INP_WLOCK(inp);
12661                 SCTP_INP_INCR_REF(inp);
12662                 SCTP_INP_WUNLOCK(inp);
12663                 /* With the lock applied look again */
12664                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12665                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12666                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12667                 }
12668                 if (stcb == NULL) {
12669                         SCTP_INP_WLOCK(inp);
12670                         SCTP_INP_DECR_REF(inp);
12671                         SCTP_INP_WUNLOCK(inp);
12672                 } else {
12673                         hold_tcblock = 1;
12674                 }
12675                 if (error) {
12676                         goto out_unlocked;
12677                 }
12678                 if (t_inp != inp) {
12679                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12680                         error = ENOTCONN;
12681                         goto out_unlocked;
12682                 }
12683         }
12684         if (stcb == NULL) {
12685                 if (addr == NULL) {
12686                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12687                         error = ENOENT;
12688                         goto out_unlocked;
12689                 } else {
12690                         /* We must go ahead and start the INIT process */
12691                         uint32_t vrf_id;
12692
12693                         if ((sinfo_flags & SCTP_ABORT) ||
12694                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12695                                 /*-
12696                                  * User asks to abort a non-existant assoc,
12697                                  * or EOF a non-existant assoc with no data
12698                                  */
12699                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12700                                 error = ENOENT;
12701                                 goto out_unlocked;
12702                         }
12703                         /* get an asoc/stcb struct */
12704                         vrf_id = inp->def_vrf_id;
12705 #ifdef INVARIANTS
12706                         if (create_lock_applied == 0) {
12707                                 panic("Error, should hold create lock and I don't?");
12708                         }
12709 #endif
12710                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12711                             inp->sctp_ep.pre_open_stream_count,
12712                             inp->sctp_ep.port,
12713                             p);
12714                         if (stcb == NULL) {
12715                                 /* Error is setup for us in the call */
12716                                 goto out_unlocked;
12717                         }
12718                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12719                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12720                                 /*
12721                                  * Set the connected flag so we can queue
12722                                  * data
12723                                  */
12724                                 soisconnecting(so);
12725                         }
12726                         hold_tcblock = 1;
12727                         if (create_lock_applied) {
12728                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12729                                 create_lock_applied = 0;
12730                         } else {
12731                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12732                         }
12733                         /*
12734                          * Turn on queue only flag to prevent data from
12735                          * being sent
12736                          */
12737                         queue_only = 1;
12738                         asoc = &stcb->asoc;
12739                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12740                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12741
12742                         /* initialize authentication params for the assoc */
12743                         sctp_initialize_auth_params(inp, stcb);
12744
12745                         if (control) {
12746                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12747                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12748                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12749                                         hold_tcblock = 0;
12750                                         stcb = NULL;
12751                                         goto out_unlocked;
12752                                 }
12753                         }
12754                         /* out with the INIT */
12755                         queue_only_for_init = 1;
12756                         /*-
12757                          * we may want to dig in after this call and adjust the MTU
12758                          * value. It defaulted to 1500 (constant) but the ro
12759                          * structure may now have an update and thus we may need to
12760                          * change it BEFORE we append the message.
12761                          */
12762                 }
12763         } else
12764                 asoc = &stcb->asoc;
12765         if (srcv == NULL)
12766                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12767         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12768                 if (addr)
12769                         net = sctp_findnet(stcb, addr);
12770                 else
12771                         net = NULL;
12772                 if ((net == NULL) ||
12773                     ((port != 0) && (port != stcb->rport))) {
12774                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12775                         error = EINVAL;
12776                         goto out_unlocked;
12777                 }
12778         } else {
12779                 if (stcb->asoc.alternate) {
12780                         net = stcb->asoc.alternate;
12781                 } else {
12782                         net = stcb->asoc.primary_destination;
12783                 }
12784         }
12785         atomic_add_int(&stcb->total_sends, 1);
12786         /* Keep the stcb from being freed under our feet */
12787         atomic_add_int(&asoc->refcnt, 1);
12788         free_cnt_applied = 1;
12789
12790         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12791                 if (sndlen > asoc->smallest_mtu) {
12792                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12793                         error = EMSGSIZE;
12794                         goto out_unlocked;
12795                 }
12796         }
12797         if (SCTP_SO_IS_NBIO(so)
12798             || (flags & MSG_NBIO)
12799             ) {
12800                 non_blocking = 1;
12801         }
12802         /* would we block? */
12803         if (non_blocking) {
12804                 if (hold_tcblock == 0) {
12805                         SCTP_TCB_LOCK(stcb);
12806                         hold_tcblock = 1;
12807                 }
12808                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12809                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12810                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12811                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12812                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12813                                 error = EMSGSIZE;
12814                         else
12815                                 error = EWOULDBLOCK;
12816                         goto out_unlocked;
12817                 }
12818                 stcb->asoc.sb_send_resv += sndlen;
12819                 SCTP_TCB_UNLOCK(stcb);
12820                 hold_tcblock = 0;
12821         } else {
12822                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12823         }
12824         local_soresv = sndlen;
12825         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12826                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12827                 error = ECONNRESET;
12828                 goto out_unlocked;
12829         }
12830         if (create_lock_applied) {
12831                 SCTP_ASOC_CREATE_UNLOCK(inp);
12832                 create_lock_applied = 0;
12833         }
12834         /* Is the stream no. valid? */
12835         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12836                 /* Invalid stream number */
12837                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12838                 error = EINVAL;
12839                 goto out_unlocked;
12840         }
12841         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12842             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12843                 /*
12844                  * Can't queue any data while stream reset is underway.
12845                  */
12846                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12847                         error = EAGAIN;
12848                 } else {
12849                         error = EINVAL;
12850                 }
12851                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12852                 goto out_unlocked;
12853         }
12854         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12855             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12856                 queue_only = 1;
12857         }
12858         /* we are now done with all control */
12859         if (control) {
12860                 sctp_m_freem(control);
12861                 control = NULL;
12862         }
12863         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12864             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12865             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12866             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12867                 if (srcv->sinfo_flags & SCTP_ABORT) {
12868                         ;
12869                 } else {
12870                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12871                         error = ECONNRESET;
12872                         goto out_unlocked;
12873                 }
12874         }
12875         /* Ok, we will attempt a msgsnd :> */
12876         if (p) {
12877                 p->td_ru.ru_msgsnd++;
12878         }
12879         /* Are we aborting? */
12880         if (srcv->sinfo_flags & SCTP_ABORT) {
12881                 struct mbuf *mm;
12882                 int tot_demand, tot_out = 0, max_out;
12883
12884                 SCTP_STAT_INCR(sctps_sends_with_abort);
12885                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12886                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12887                         /* It has to be up before we abort */
12888                         /* how big is the user initiated abort? */
12889                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12890                         error = EINVAL;
12891                         goto out;
12892                 }
12893                 if (hold_tcblock) {
12894                         SCTP_TCB_UNLOCK(stcb);
12895                         hold_tcblock = 0;
12896                 }
12897                 if (top) {
12898                         struct mbuf *cntm = NULL;
12899
12900                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12901                         if (sndlen != 0) {
12902                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12903                                         tot_out += SCTP_BUF_LEN(cntm);
12904                                 }
12905                         }
12906                 } else {
12907                         /* Must fit in a MTU */
12908                         tot_out = sndlen;
12909                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12910                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12911                                 /* To big */
12912                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12913                                 error = EMSGSIZE;
12914                                 goto out;
12915                         }
12916                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12917                 }
12918                 if (mm == NULL) {
12919                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12920                         error = ENOMEM;
12921                         goto out;
12922                 }
12923                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12924                 max_out -= sizeof(struct sctp_abort_msg);
12925                 if (tot_out > max_out) {
12926                         tot_out = max_out;
12927                 }
12928                 if (mm) {
12929                         struct sctp_paramhdr *ph;
12930
12931                         /* now move forward the data pointer */
12932                         ph = mtod(mm, struct sctp_paramhdr *);
12933                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12934                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12935                         ph++;
12936                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12937                         if (top == NULL) {
12938                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12939                                 if (error) {
12940                                         /*-
12941                                          * Here if we can't get his data we
12942                                          * still abort we just don't get to
12943                                          * send the users note :-0
12944                                          */
12945                                         sctp_m_freem(mm);
12946                                         mm = NULL;
12947                                 }
12948                         } else {
12949                                 if (sndlen != 0) {
12950                                         SCTP_BUF_NEXT(mm) = top;
12951                                 }
12952                         }
12953                 }
12954                 if (hold_tcblock == 0) {
12955                         SCTP_TCB_LOCK(stcb);
12956                 }
12957                 atomic_add_int(&stcb->asoc.refcnt, -1);
12958                 free_cnt_applied = 0;
12959                 /* release this lock, otherwise we hang on ourselves */
12960                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12961                 /* now relock the stcb so everything is sane */
12962                 hold_tcblock = 0;
12963                 stcb = NULL;
12964                 /*
12965                  * In this case top is already chained to mm avoid double
12966                  * free, since we free it below if top != NULL and driver
12967                  * would free it after sending the packet out
12968                  */
12969                 if (sndlen != 0) {
12970                         top = NULL;
12971                 }
12972                 goto out_unlocked;
12973         }
12974         /* Calculate the maximum we can send */
12975         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12976         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12977                 if (non_blocking) {
12978                         /* we already checked for non-blocking above. */
12979                         max_len = sndlen;
12980                 } else {
12981                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12982                 }
12983         } else {
12984                 max_len = 0;
12985         }
12986         if (hold_tcblock) {
12987                 SCTP_TCB_UNLOCK(stcb);
12988                 hold_tcblock = 0;
12989         }
12990         if (asoc->strmout == NULL) {
12991                 /* huh? software error */
12992                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12993                 error = EFAULT;
12994                 goto out_unlocked;
12995         }
12996         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12997         if ((user_marks_eor == 0) &&
12998             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12999                 /* It will NEVER fit */
13000                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13001                 error = EMSGSIZE;
13002                 goto out_unlocked;
13003         }
13004         if ((uio == NULL) && user_marks_eor) {
13005                 /*-
13006                  * We do not support eeor mode for
13007                  * sending with mbuf chains (like sendfile).
13008                  */
13009                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13010                 error = EINVAL;
13011                 goto out_unlocked;
13012         }
13013         if (user_marks_eor) {
13014                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13015         } else {
13016                 /*-
13017                  * For non-eeor the whole message must fit in
13018                  * the socket send buffer.
13019                  */
13020                 local_add_more = sndlen;
13021         }
13022         len = 0;
13023         if (non_blocking) {
13024                 goto skip_preblock;
13025         }
13026         if (((max_len <= local_add_more) &&
13027             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13028             (max_len == 0) ||
13029             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13030                 /* No room right now ! */
13031                 SOCKBUF_LOCK(&so->so_snd);
13032                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13033                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13034                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13035                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13036                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13037                             inqueue_bytes,
13038                             local_add_more,
13039                             stcb->asoc.stream_queue_cnt,
13040                             stcb->asoc.chunks_on_out_queue,
13041                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13042                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13043                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13044                         }
13045                         be.error = 0;
13046                         stcb->block_entry = &be;
13047                         error = sbwait(&so->so_snd);
13048                         stcb->block_entry = NULL;
13049                         if (error || so->so_error || be.error) {
13050                                 if (error == 0) {
13051                                         if (so->so_error)
13052                                                 error = so->so_error;
13053                                         if (be.error) {
13054                                                 error = be.error;
13055                                         }
13056                                 }
13057                                 SOCKBUF_UNLOCK(&so->so_snd);
13058                                 goto out_unlocked;
13059                         }
13060                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13061                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13062                                     asoc, stcb->asoc.total_output_queue_size);
13063                         }
13064                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13065                                 SOCKBUF_UNLOCK(&so->so_snd);
13066                                 goto out_unlocked;
13067                         }
13068                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13069                 }
13070                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13071                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13072                 } else {
13073                         max_len = 0;
13074                 }
13075                 SOCKBUF_UNLOCK(&so->so_snd);
13076         }
13077 skip_preblock:
13078         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13079                 goto out_unlocked;
13080         }
13081         /*
13082          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13083          * case NOTE: uio will be null when top/mbuf is passed
13084          */
13085         if (sndlen == 0) {
13086                 if (srcv->sinfo_flags & SCTP_EOF) {
13087                         got_all_of_the_send = 1;
13088                         goto dataless_eof;
13089                 } else {
13090                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13091                         error = EINVAL;
13092                         goto out;
13093                 }
13094         }
13095         if (top == NULL) {
13096                 struct sctp_stream_queue_pending *sp;
13097                 struct sctp_stream_out *strm;
13098                 uint32_t sndout;
13099
13100                 SCTP_TCB_SEND_LOCK(stcb);
13101                 if ((asoc->stream_locked) &&
13102                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13103                         SCTP_TCB_SEND_UNLOCK(stcb);
13104                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13105                         error = EINVAL;
13106                         goto out;
13107                 }
13108                 SCTP_TCB_SEND_UNLOCK(stcb);
13109
13110                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13111                 if (strm->last_msg_incomplete == 0) {
13112         do_a_copy_in:
13113                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13114                         if ((sp == NULL) || (error)) {
13115                                 goto out;
13116                         }
13117                         SCTP_TCB_SEND_LOCK(stcb);
13118                         if (sp->msg_is_complete) {
13119                                 strm->last_msg_incomplete = 0;
13120                                 asoc->stream_locked = 0;
13121                         } else {
13122                                 /*
13123                                  * Just got locked to this guy in case of an
13124                                  * interrupt.
13125                                  */
13126                                 strm->last_msg_incomplete = 1;
13127                                 if (stcb->asoc.idata_supported == 0) {
13128                                         asoc->stream_locked = 1;
13129                                         asoc->stream_locked_on = srcv->sinfo_stream;
13130                                 }
13131                                 sp->sender_all_done = 0;
13132                         }
13133                         sctp_snd_sb_alloc(stcb, sp->length);
13134                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13135                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13136                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13137                         }
13138                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13139                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13140                         SCTP_TCB_SEND_UNLOCK(stcb);
13141                 } else {
13142                         SCTP_TCB_SEND_LOCK(stcb);
13143                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13144                         SCTP_TCB_SEND_UNLOCK(stcb);
13145                         if (sp == NULL) {
13146                                 /* ???? Huh ??? last msg is gone */
13147 #ifdef INVARIANTS
13148                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13149 #else
13150                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13151                                 strm->last_msg_incomplete = 0;
13152 #endif
13153                                 goto do_a_copy_in;
13154
13155                         }
13156                 }
13157                 while (uio->uio_resid > 0) {
13158                         /* How much room do we have? */
13159                         struct mbuf *new_tail, *mm;
13160
13161                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13162                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13163                         else
13164                                 max_len = 0;
13165
13166                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13167                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13168                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13169                                 sndout = 0;
13170                                 new_tail = NULL;
13171                                 if (hold_tcblock) {
13172                                         SCTP_TCB_UNLOCK(stcb);
13173                                         hold_tcblock = 0;
13174                                 }
13175                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13176                                 if ((mm == NULL) || error) {
13177                                         if (mm) {
13178                                                 sctp_m_freem(mm);
13179                                         }
13180                                         goto out;
13181                                 }
13182                                 /* Update the mbuf and count */
13183                                 SCTP_TCB_SEND_LOCK(stcb);
13184                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13185                                         /*
13186                                          * we need to get out. Peer probably
13187                                          * aborted.
13188                                          */
13189                                         sctp_m_freem(mm);
13190                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13191                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13192                                                 error = ECONNRESET;
13193                                         }
13194                                         SCTP_TCB_SEND_UNLOCK(stcb);
13195                                         goto out;
13196                                 }
13197                                 if (sp->tail_mbuf) {
13198                                         /* tack it to the end */
13199                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13200                                         sp->tail_mbuf = new_tail;
13201                                 } else {
13202                                         /* A stolen mbuf */
13203                                         sp->data = mm;
13204                                         sp->tail_mbuf = new_tail;
13205                                 }
13206                                 sctp_snd_sb_alloc(stcb, sndout);
13207                                 atomic_add_int(&sp->length, sndout);
13208                                 len += sndout;
13209                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13210                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13211                                 }
13212                                 /* Did we reach EOR? */
13213                                 if ((uio->uio_resid == 0) &&
13214                                     ((user_marks_eor == 0) ||
13215                                     (srcv->sinfo_flags & SCTP_EOF) ||
13216                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13217                                         sp->msg_is_complete = 1;
13218                                 } else {
13219                                         sp->msg_is_complete = 0;
13220                                 }
13221                                 SCTP_TCB_SEND_UNLOCK(stcb);
13222                         }
13223                         if (uio->uio_resid == 0) {
13224                                 /* got it all? */
13225                                 continue;
13226                         }
13227                         /* PR-SCTP? */
13228                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13229                                 /*
13230                                  * This is ugly but we must assure locking
13231                                  * order
13232                                  */
13233                                 if (hold_tcblock == 0) {
13234                                         SCTP_TCB_LOCK(stcb);
13235                                         hold_tcblock = 1;
13236                                 }
13237                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13238                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13239                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13240                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13241                                 else
13242                                         max_len = 0;
13243                                 if (max_len > 0) {
13244                                         continue;
13245                                 }
13246                                 SCTP_TCB_UNLOCK(stcb);
13247                                 hold_tcblock = 0;
13248                         }
13249                         /* wait for space now */
13250                         if (non_blocking) {
13251                                 /* Non-blocking io in place out */
13252                                 goto skip_out_eof;
13253                         }
13254                         /* What about the INIT, send it maybe */
13255                         if (queue_only_for_init) {
13256                                 if (hold_tcblock == 0) {
13257                                         SCTP_TCB_LOCK(stcb);
13258                                         hold_tcblock = 1;
13259                                 }
13260                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13261                                         /* a collision took us forward? */
13262                                         queue_only = 0;
13263                                 } else {
13264                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13265                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13266                                         queue_only = 1;
13267                                 }
13268                         }
13269                         if ((net->flight_size > net->cwnd) &&
13270                             (asoc->sctp_cmt_on_off == 0)) {
13271                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13272                                 queue_only = 1;
13273                         } else if (asoc->ifp_had_enobuf) {
13274                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13275                                 if (net->flight_size > (2 * net->mtu)) {
13276                                         queue_only = 1;
13277                                 }
13278                                 asoc->ifp_had_enobuf = 0;
13279                         }
13280                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13281                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13282                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13283                             (stcb->asoc.total_flight > 0) &&
13284                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13285                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13286
13287                                 /*-
13288                                  * Ok, Nagle is set on and we have data outstanding.
13289                                  * Don't send anything and let SACKs drive out the
13290                                  * data unless we have a "full" segment to send.
13291                                  */
13292                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13293                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13294                                 }
13295                                 SCTP_STAT_INCR(sctps_naglequeued);
13296                                 nagle_applies = 1;
13297                         } else {
13298                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13299                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13300                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13301                                 }
13302                                 SCTP_STAT_INCR(sctps_naglesent);
13303                                 nagle_applies = 0;
13304                         }
13305                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13306
13307                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13308                                     nagle_applies, un_sent);
13309                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13310                                     stcb->asoc.total_flight,
13311                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13312                         }
13313                         if (queue_only_for_init)
13314                                 queue_only_for_init = 0;
13315                         if ((queue_only == 0) && (nagle_applies == 0)) {
13316                                 /*-
13317                                  * need to start chunk output
13318                                  * before blocking.. note that if
13319                                  * a lock is already applied, then
13320                                  * the input via the net is happening
13321                                  * and I don't need to start output :-D
13322                                  */
13323                                 if (hold_tcblock == 0) {
13324                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13325                                                 hold_tcblock = 1;
13326                                                 sctp_chunk_output(inp,
13327                                                     stcb,
13328                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13329                                         }
13330                                 } else {
13331                                         sctp_chunk_output(inp,
13332                                             stcb,
13333                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13334                                 }
13335                                 if (hold_tcblock == 1) {
13336                                         SCTP_TCB_UNLOCK(stcb);
13337                                         hold_tcblock = 0;
13338                                 }
13339                         }
13340                         SOCKBUF_LOCK(&so->so_snd);
13341                         /*-
13342                          * This is a bit strange, but I think it will
13343                          * work. The total_output_queue_size is locked and
13344                          * protected by the TCB_LOCK, which we just released.
13345                          * There is a race that can occur between releasing it
13346                          * above, and me getting the socket lock, where sacks
13347                          * come in but we have not put the SB_WAIT on the
13348                          * so_snd buffer to get the wakeup. After the LOCK
13349                          * is applied the sack_processing will also need to
13350                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13351                          * once we have the socket buffer lock if we recheck the
13352                          * size we KNOW we will get to sleep safely with the
13353                          * wakeup flag in place.
13354                          */
13355                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13356                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13357                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13358                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13359                                             asoc, (size_t)uio->uio_resid);
13360                                 }
13361                                 be.error = 0;
13362                                 stcb->block_entry = &be;
13363                                 error = sbwait(&so->so_snd);
13364                                 stcb->block_entry = NULL;
13365
13366                                 if (error || so->so_error || be.error) {
13367                                         if (error == 0) {
13368                                                 if (so->so_error)
13369                                                         error = so->so_error;
13370                                                 if (be.error) {
13371                                                         error = be.error;
13372                                                 }
13373                                         }
13374                                         SOCKBUF_UNLOCK(&so->so_snd);
13375                                         goto out_unlocked;
13376                                 }
13377                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13378                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13379                                             asoc, stcb->asoc.total_output_queue_size);
13380                                 }
13381                         }
13382                         SOCKBUF_UNLOCK(&so->so_snd);
13383                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13384                                 goto out_unlocked;
13385                         }
13386                 }
13387                 SCTP_TCB_SEND_LOCK(stcb);
13388                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13389                         SCTP_TCB_SEND_UNLOCK(stcb);
13390                         goto out_unlocked;
13391                 }
13392                 if (sp) {
13393                         if (sp->msg_is_complete == 0) {
13394                                 strm->last_msg_incomplete = 1;
13395                                 if (stcb->asoc.idata_supported == 0) {
13396                                         asoc->stream_locked = 1;
13397                                         asoc->stream_locked_on = srcv->sinfo_stream;
13398                                 }
13399                         } else {
13400                                 sp->sender_all_done = 1;
13401                                 strm->last_msg_incomplete = 0;
13402                                 asoc->stream_locked = 0;
13403                         }
13404                 } else {
13405                         SCTP_PRINTF("Huh no sp TSNH?\n");
13406                         strm->last_msg_incomplete = 0;
13407                         asoc->stream_locked = 0;
13408                 }
13409                 SCTP_TCB_SEND_UNLOCK(stcb);
13410                 if (uio->uio_resid == 0) {
13411                         got_all_of_the_send = 1;
13412                 }
13413         } else {
13414                 /* We send in a 0, since we do NOT have any locks */
13415                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13416                 top = NULL;
13417                 if (srcv->sinfo_flags & SCTP_EOF) {
13418                         /*
13419                          * This should only happen for Panda for the mbuf
13420                          * send case, which does NOT yet support EEOR mode.
13421                          * Thus, we can just set this flag to do the proper
13422                          * EOF handling.
13423                          */
13424                         got_all_of_the_send = 1;
13425                 }
13426         }
13427         if (error) {
13428                 goto out;
13429         }
13430 dataless_eof:
13431         /* EOF thing ? */
13432         if ((srcv->sinfo_flags & SCTP_EOF) &&
13433             (got_all_of_the_send == 1)) {
13434                 SCTP_STAT_INCR(sctps_sends_with_eof);
13435                 error = 0;
13436                 if (hold_tcblock == 0) {
13437                         SCTP_TCB_LOCK(stcb);
13438                         hold_tcblock = 1;
13439                 }
13440                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13441                     TAILQ_EMPTY(&asoc->sent_queue) &&
13442                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13443                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13444                                 goto abort_anyway;
13445                         }
13446                         /* there is nothing queued to send, so I'm done... */
13447                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13448                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13449                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13450                                 struct sctp_nets *netp;
13451
13452                                 /* only send SHUTDOWN the first time through */
13453                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13454                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13455                                 }
13456                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13457                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13458                                 sctp_stop_timers_for_shutdown(stcb);
13459                                 if (stcb->asoc.alternate) {
13460                                         netp = stcb->asoc.alternate;
13461                                 } else {
13462                                         netp = stcb->asoc.primary_destination;
13463                                 }
13464                                 sctp_send_shutdown(stcb, netp);
13465                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13466                                     netp);
13467                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13468                                     asoc->primary_destination);
13469                         }
13470                 } else {
13471                         /*-
13472                          * we still got (or just got) data to send, so set
13473                          * SHUTDOWN_PENDING
13474                          */
13475                         /*-
13476                          * XXX sockets draft says that SCTP_EOF should be
13477                          * sent with no data.  currently, we will allow user
13478                          * data to be sent first and move to
13479                          * SHUTDOWN-PENDING
13480                          */
13481                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13482                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13483                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13484                                 if (hold_tcblock == 0) {
13485                                         SCTP_TCB_LOCK(stcb);
13486                                         hold_tcblock = 1;
13487                                 }
13488                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13489                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13490                                 }
13491                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13492                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13493                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13494                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13495                                         struct mbuf *op_err;
13496                                         char msg[SCTP_DIAG_INFO_LEN];
13497
13498                         abort_anyway:
13499                                         if (free_cnt_applied) {
13500                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13501                                                 free_cnt_applied = 0;
13502                                         }
13503                                         snprintf(msg, sizeof(msg),
13504                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13505                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13506                                             msg);
13507                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13508                                             op_err, SCTP_SO_LOCKED);
13509                                         /*
13510                                          * now relock the stcb so everything
13511                                          * is sane
13512                                          */
13513                                         hold_tcblock = 0;
13514                                         stcb = NULL;
13515                                         goto out;
13516                                 }
13517                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13518                                     asoc->primary_destination);
13519                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13520                         }
13521                 }
13522         }
13523 skip_out_eof:
13524         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13525                 some_on_control = 1;
13526         }
13527         if (queue_only_for_init) {
13528                 if (hold_tcblock == 0) {
13529                         SCTP_TCB_LOCK(stcb);
13530                         hold_tcblock = 1;
13531                 }
13532                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13533                         /* a collision took us forward? */
13534                         queue_only = 0;
13535                 } else {
13536                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13537                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13538                         queue_only = 1;
13539                 }
13540         }
13541         if ((net->flight_size > net->cwnd) &&
13542             (stcb->asoc.sctp_cmt_on_off == 0)) {
13543                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13544                 queue_only = 1;
13545         } else if (asoc->ifp_had_enobuf) {
13546                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13547                 if (net->flight_size > (2 * net->mtu)) {
13548                         queue_only = 1;
13549                 }
13550                 asoc->ifp_had_enobuf = 0;
13551         }
13552         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13553             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13554         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13555             (stcb->asoc.total_flight > 0) &&
13556             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13557             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13558                 /*-
13559                  * Ok, Nagle is set on and we have data outstanding.
13560                  * Don't send anything and let SACKs drive out the
13561                  * data unless wen have a "full" segment to send.
13562                  */
13563                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13564                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13565                 }
13566                 SCTP_STAT_INCR(sctps_naglequeued);
13567                 nagle_applies = 1;
13568         } else {
13569                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13570                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13571                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13572                 }
13573                 SCTP_STAT_INCR(sctps_naglesent);
13574                 nagle_applies = 0;
13575         }
13576         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13577                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13578                     nagle_applies, un_sent);
13579                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13580                     stcb->asoc.total_flight,
13581                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13582         }
13583         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13584                 /* we can attempt to send too. */
13585                 if (hold_tcblock == 0) {
13586                         /*
13587                          * If there is activity recv'ing sacks no need to
13588                          * send
13589                          */
13590                         if (SCTP_TCB_TRYLOCK(stcb)) {
13591                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13592                                 hold_tcblock = 1;
13593                         }
13594                 } else {
13595                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13596                 }
13597         } else if ((queue_only == 0) &&
13598                     (stcb->asoc.peers_rwnd == 0) &&
13599             (stcb->asoc.total_flight == 0)) {
13600                 /* We get to have a probe outstanding */
13601                 if (hold_tcblock == 0) {
13602                         hold_tcblock = 1;
13603                         SCTP_TCB_LOCK(stcb);
13604                 }
13605                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13606         } else if (some_on_control) {
13607                 int num_out, reason, frag_point;
13608
13609                 /* Here we do control only */
13610                 if (hold_tcblock == 0) {
13611                         hold_tcblock = 1;
13612                         SCTP_TCB_LOCK(stcb);
13613                 }
13614                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13615                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13616                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13617         }
13618         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13619             queue_only, stcb->asoc.peers_rwnd, un_sent,
13620             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13621             stcb->asoc.total_output_queue_size, error);
13622
13623 out:
13624 out_unlocked:
13625
13626         if (local_soresv && stcb) {
13627                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13628         }
13629         if (create_lock_applied) {
13630                 SCTP_ASOC_CREATE_UNLOCK(inp);
13631         }
13632         if ((stcb) && hold_tcblock) {
13633                 SCTP_TCB_UNLOCK(stcb);
13634         }
13635         if (stcb && free_cnt_applied) {
13636                 atomic_add_int(&stcb->asoc.refcnt, -1);
13637         }
13638 #ifdef INVARIANTS
13639         if (stcb) {
13640                 if (mtx_owned(&stcb->tcb_mtx)) {
13641                         panic("Leaving with tcb mtx owned?");
13642                 }
13643                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13644                         panic("Leaving with tcb send mtx owned?");
13645                 }
13646         }
13647 #endif
13648         if (top) {
13649                 sctp_m_freem(top);
13650         }
13651         if (control) {
13652                 sctp_m_freem(control);
13653         }
13654         return (error);
13655 }
13656
13657
13658 /*
13659  * generate an AUTHentication chunk, if required
13660  */
13661 struct mbuf *
13662 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13663     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13664     struct sctp_tcb *stcb, uint8_t chunk)
13665 {
13666         struct mbuf *m_auth;
13667         struct sctp_auth_chunk *auth;
13668         int chunk_len;
13669         struct mbuf *cn;
13670
13671         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13672             (stcb == NULL))
13673                 return (m);
13674
13675         if (stcb->asoc.auth_supported == 0) {
13676                 return (m);
13677         }
13678         /* does the requested chunk require auth? */
13679         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13680                 return (m);
13681         }
13682         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13683         if (m_auth == NULL) {
13684                 /* no mbuf's */
13685                 return (m);
13686         }
13687         /* reserve some space if this will be the first mbuf */
13688         if (m == NULL)
13689                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13690         /* fill in the AUTH chunk details */
13691         auth = mtod(m_auth, struct sctp_auth_chunk *);
13692         bzero(auth, sizeof(*auth));
13693         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13694         auth->ch.chunk_flags = 0;
13695         chunk_len = sizeof(*auth) +
13696             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13697         auth->ch.chunk_length = htons(chunk_len);
13698         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13699         /* key id and hmac digest will be computed and filled in upon send */
13700
13701         /* save the offset where the auth was inserted into the chain */
13702         *offset = 0;
13703         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13704                 *offset += SCTP_BUF_LEN(cn);
13705         }
13706
13707         /* update length and return pointer to the auth chunk */
13708         SCTP_BUF_LEN(m_auth) = chunk_len;
13709         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13710         if (auth_ret != NULL)
13711                 *auth_ret = auth;
13712
13713         return (m);
13714 }
13715
13716 #ifdef INET6
13717 int
13718 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13719 {
13720         struct nd_prefix *pfx = NULL;
13721         struct nd_pfxrouter *pfxrtr = NULL;
13722         struct sockaddr_in6 gw6;
13723
13724         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13725                 return (0);
13726
13727         /* get prefix entry of address */
13728         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13729                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13730                         continue;
13731                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13732                     &src6->sin6_addr, &pfx->ndpr_mask))
13733                         break;
13734         }
13735         /* no prefix entry in the prefix list */
13736         if (pfx == NULL) {
13737                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13738                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13739                 return (0);
13740         }
13741         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13742         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13743
13744         /* search installed gateway from prefix entry */
13745         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13746                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13747                 gw6.sin6_family = AF_INET6;
13748                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13749                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13750                     sizeof(struct in6_addr));
13751                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13752                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13753                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13754                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13755                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13756                         ND6_RUNLOCK();
13757                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13758                         return (1);
13759                 }
13760         }
13761         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13762         return (0);
13763 }
13764 #endif
13765
13766 int
13767 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13768 {
13769 #ifdef INET
13770         struct sockaddr_in *sin, *mask;
13771         struct ifaddr *ifa;
13772         struct in_addr srcnetaddr, gwnetaddr;
13773
13774         if (ro == NULL || ro->ro_rt == NULL ||
13775             sifa->address.sa.sa_family != AF_INET) {
13776                 return (0);
13777         }
13778         ifa = (struct ifaddr *)sifa->ifa;
13779         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13780         sin = &sifa->address.sin;
13781         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13782         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13783         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13784         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13785
13786         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13787         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13788         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13789         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13790         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13791         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13792                 return (1);
13793         }
13794 #endif
13795         return (0);
13796 }