sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59
  60
  61 #define SCTP_MAX_GAPS_INARRAY 4
  62 struct sack_track {
  63         uint8_t right_edge;     /* mergable on the right edge */
  64         uint8_t left_edge;      /* mergable on the left edge */
  65         uint8_t num_entries;
  66         uint8_t spare;
  67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  68 };
  69
  70 const struct sack_track sack_array[256] = {
  71         {0, 0, 0, 0,            /* 0x00 */
  72                 {{0, 0},
  73                 {0, 0},
  74                 {0, 0},
  75                 {0, 0}
  76                 }
  77         },
  78         {1, 0, 1, 0,            /* 0x01 */
  79                 {{0, 0},
  80                 {0, 0},
  81                 {0, 0},
  82                 {0, 0}
  83                 }
  84         },
  85         {0, 0, 1, 0,            /* 0x02 */
  86                 {{1, 1},
  87                 {0, 0},
  88                 {0, 0},
  89                 {0, 0}
  90                 }
  91         },
  92         {1, 0, 1, 0,            /* 0x03 */
  93                 {{0, 1},
  94                 {0, 0},
  95                 {0, 0},
  96                 {0, 0}
  97                 }
  98         },
  99         {0, 0, 1, 0,            /* 0x04 */
 100                 {{2, 2},
 101                 {0, 0},
 102                 {0, 0},
 103                 {0, 0}
 104                 }
 105         },
 106         {1, 0, 2, 0,            /* 0x05 */
 107                 {{0, 0},
 108                 {2, 2},
 109                 {0, 0},
 110                 {0, 0}
 111                 }
 112         },
 113         {0, 0, 1, 0,            /* 0x06 */
 114                 {{1, 2},
 115                 {0, 0},
 116                 {0, 0},
 117                 {0, 0}
 118                 }
 119         },
 120         {1, 0, 1, 0,            /* 0x07 */
 121                 {{0, 2},
 122                 {0, 0},
 123                 {0, 0},
 124                 {0, 0}
 125                 }
 126         },
 127         {0, 0, 1, 0,            /* 0x08 */
 128                 {{3, 3},
 129                 {0, 0},
 130                 {0, 0},
 131                 {0, 0}
 132                 }
 133         },
 134         {1, 0, 2, 0,            /* 0x09 */
 135                 {{0, 0},
 136                 {3, 3},
 137                 {0, 0},
 138                 {0, 0}
 139                 }
 140         },
 141         {0, 0, 2, 0,            /* 0x0a */
 142                 {{1, 1},
 143                 {3, 3},
 144                 {0, 0},
 145                 {0, 0}
 146                 }
 147         },
 148         {1, 0, 2, 0,            /* 0x0b */
 149                 {{0, 1},
 150                 {3, 3},
 151                 {0, 0},
 152                 {0, 0}
 153                 }
 154         },
 155         {0, 0, 1, 0,            /* 0x0c */
 156                 {{2, 3},
 157                 {0, 0},
 158                 {0, 0},
 159                 {0, 0}
 160                 }
 161         },
 162         {1, 0, 2, 0,            /* 0x0d */
 163                 {{0, 0},
 164                 {2, 3},
 165                 {0, 0},
 166                 {0, 0}
 167                 }
 168         },
 169         {0, 0, 1, 0,            /* 0x0e */
 170                 {{1, 3},
 171                 {0, 0},
 172                 {0, 0},
 173                 {0, 0}
 174                 }
 175         },
 176         {1, 0, 1, 0,            /* 0x0f */
 177                 {{0, 3},
 178                 {0, 0},
 179                 {0, 0},
 180                 {0, 0}
 181                 }
 182         },
 183         {0, 0, 1, 0,            /* 0x10 */
 184                 {{4, 4},
 185                 {0, 0},
 186                 {0, 0},
 187                 {0, 0}
 188                 }
 189         },
 190         {1, 0, 2, 0,            /* 0x11 */
 191                 {{0, 0},
 192                 {4, 4},
 193                 {0, 0},
 194                 {0, 0}
 195                 }
 196         },
 197         {0, 0, 2, 0,            /* 0x12 */
 198                 {{1, 1},
 199                 {4, 4},
 200                 {0, 0},
 201                 {0, 0}
 202                 }
 203         },
 204         {1, 0, 2, 0,            /* 0x13 */
 205                 {{0, 1},
 206                 {4, 4},
 207                 {0, 0},
 208                 {0, 0}
 209                 }
 210         },
 211         {0, 0, 2, 0,            /* 0x14 */
 212                 {{2, 2},
 213                 {4, 4},
 214                 {0, 0},
 215                 {0, 0}
 216                 }
 217         },
 218         {1, 0, 3, 0,            /* 0x15 */
 219                 {{0, 0},
 220                 {2, 2},
 221                 {4, 4},
 222                 {0, 0}
 223                 }
 224         },
 225         {0, 0, 2, 0,            /* 0x16 */
 226                 {{1, 2},
 227                 {4, 4},
 228                 {0, 0},
 229                 {0, 0}
 230                 }
 231         },
 232         {1, 0, 2, 0,            /* 0x17 */
 233                 {{0, 2},
 234                 {4, 4},
 235                 {0, 0},
 236                 {0, 0}
 237                 }
 238         },
 239         {0, 0, 1, 0,            /* 0x18 */
 240                 {{3, 4},
 241                 {0, 0},
 242                 {0, 0},
 243                 {0, 0}
 244                 }
 245         },
 246         {1, 0, 2, 0,            /* 0x19 */
 247                 {{0, 0},
 248                 {3, 4},
 249                 {0, 0},
 250                 {0, 0}
 251                 }
 252         },
 253         {0, 0, 2, 0,            /* 0x1a */
 254                 {{1, 1},
 255                 {3, 4},
 256                 {0, 0},
 257                 {0, 0}
 258                 }
 259         },
 260         {1, 0, 2, 0,            /* 0x1b */
 261                 {{0, 1},
 262                 {3, 4},
 263                 {0, 0},
 264                 {0, 0}
 265                 }
 266         },
 267         {0, 0, 1, 0,            /* 0x1c */
 268                 {{2, 4},
 269                 {0, 0},
 270                 {0, 0},
 271                 {0, 0}
 272                 }
 273         },
 274         {1, 0, 2, 0,            /* 0x1d */
 275                 {{0, 0},
 276                 {2, 4},
 277                 {0, 0},
 278                 {0, 0}
 279                 }
 280         },
 281         {0, 0, 1, 0,            /* 0x1e */
 282                 {{1, 4},
 283                 {0, 0},
 284                 {0, 0},
 285                 {0, 0}
 286                 }
 287         },
 288         {1, 0, 1, 0,            /* 0x1f */
 289                 {{0, 4},
 290                 {0, 0},
 291                 {0, 0},
 292                 {0, 0}
 293                 }
 294         },
 295         {0, 0, 1, 0,            /* 0x20 */
 296                 {{5, 5},
 297                 {0, 0},
 298                 {0, 0},
 299                 {0, 0}
 300                 }
 301         },
 302         {1, 0, 2, 0,            /* 0x21 */
 303                 {{0, 0},
 304                 {5, 5},
 305                 {0, 0},
 306                 {0, 0}
 307                 }
 308         },
 309         {0, 0, 2, 0,            /* 0x22 */
 310                 {{1, 1},
 311                 {5, 5},
 312                 {0, 0},
 313                 {0, 0}
 314                 }
 315         },
 316         {1, 0, 2, 0,            /* 0x23 */
 317                 {{0, 1},
 318                 {5, 5},
 319                 {0, 0},
 320                 {0, 0}
 321                 }
 322         },
 323         {0, 0, 2, 0,            /* 0x24 */
 324                 {{2, 2},
 325                 {5, 5},
 326                 {0, 0},
 327                 {0, 0}
 328                 }
 329         },
 330         {1, 0, 3, 0,            /* 0x25 */
 331                 {{0, 0},
 332                 {2, 2},
 333                 {5, 5},
 334                 {0, 0}
 335                 }
 336         },
 337         {0, 0, 2, 0,            /* 0x26 */
 338                 {{1, 2},
 339                 {5, 5},
 340                 {0, 0},
 341                 {0, 0}
 342                 }
 343         },
 344         {1, 0, 2, 0,            /* 0x27 */
 345                 {{0, 2},
 346                 {5, 5},
 347                 {0, 0},
 348                 {0, 0}
 349                 }
 350         },
 351         {0, 0, 2, 0,            /* 0x28 */
 352                 {{3, 3},
 353                 {5, 5},
 354                 {0, 0},
 355                 {0, 0}
 356                 }
 357         },
 358         {1, 0, 3, 0,            /* 0x29 */
 359                 {{0, 0},
 360                 {3, 3},
 361                 {5, 5},
 362                 {0, 0}
 363                 }
 364         },
 365         {0, 0, 3, 0,            /* 0x2a */
 366                 {{1, 1},
 367                 {3, 3},
 368                 {5, 5},
 369                 {0, 0}
 370                 }
 371         },
 372         {1, 0, 3, 0,            /* 0x2b */
 373                 {{0, 1},
 374                 {3, 3},
 375                 {5, 5},
 376                 {0, 0}
 377                 }
 378         },
 379         {0, 0, 2, 0,            /* 0x2c */
 380                 {{2, 3},
 381                 {5, 5},
 382                 {0, 0},
 383                 {0, 0}
 384                 }
 385         },
 386         {1, 0, 3, 0,            /* 0x2d */
 387                 {{0, 0},
 388                 {2, 3},
 389                 {5, 5},
 390                 {0, 0}
 391                 }
 392         },
 393         {0, 0, 2, 0,            /* 0x2e */
 394                 {{1, 3},
 395                 {5, 5},
 396                 {0, 0},
 397                 {0, 0}
 398                 }
 399         },
 400         {1, 0, 2, 0,            /* 0x2f */
 401                 {{0, 3},
 402                 {5, 5},
 403                 {0, 0},
 404                 {0, 0}
 405                 }
 406         },
 407         {0, 0, 1, 0,            /* 0x30 */
 408                 {{4, 5},
 409                 {0, 0},
 410                 {0, 0},
 411                 {0, 0}
 412                 }
 413         },
 414         {1, 0, 2, 0,            /* 0x31 */
 415                 {{0, 0},
 416                 {4, 5},
 417                 {0, 0},
 418                 {0, 0}
 419                 }
 420         },
 421         {0, 0, 2, 0,            /* 0x32 */
 422                 {{1, 1},
 423                 {4, 5},
 424                 {0, 0},
 425                 {0, 0}
 426                 }
 427         },
 428         {1, 0, 2, 0,            /* 0x33 */
 429                 {{0, 1},
 430                 {4, 5},
 431                 {0, 0},
 432                 {0, 0}
 433                 }
 434         },
 435         {0, 0, 2, 0,            /* 0x34 */
 436                 {{2, 2},
 437                 {4, 5},
 438                 {0, 0},
 439                 {0, 0}
 440                 }
 441         },
 442         {1, 0, 3, 0,            /* 0x35 */
 443                 {{0, 0},
 444                 {2, 2},
 445                 {4, 5},
 446                 {0, 0}
 447                 }
 448         },
 449         {0, 0, 2, 0,            /* 0x36 */
 450                 {{1, 2},
 451                 {4, 5},
 452                 {0, 0},
 453                 {0, 0}
 454                 }
 455         },
 456         {1, 0, 2, 0,            /* 0x37 */
 457                 {{0, 2},
 458                 {4, 5},
 459                 {0, 0},
 460                 {0, 0}
 461                 }
 462         },
 463         {0, 0, 1, 0,            /* 0x38 */
 464                 {{3, 5},
 465                 {0, 0},
 466                 {0, 0},
 467                 {0, 0}
 468                 }
 469         },
 470         {1, 0, 2, 0,            /* 0x39 */
 471                 {{0, 0},
 472                 {3, 5},
 473                 {0, 0},
 474                 {0, 0}
 475                 }
 476         },
 477         {0, 0, 2, 0,            /* 0x3a */
 478                 {{1, 1},
 479                 {3, 5},
 480                 {0, 0},
 481                 {0, 0}
 482                 }
 483         },
 484         {1, 0, 2, 0,            /* 0x3b */
 485                 {{0, 1},
 486                 {3, 5},
 487                 {0, 0},
 488                 {0, 0}
 489                 }
 490         },
 491         {0, 0, 1, 0,            /* 0x3c */
 492                 {{2, 5},
 493                 {0, 0},
 494                 {0, 0},
 495                 {0, 0}
 496                 }
 497         },
 498         {1, 0, 2, 0,            /* 0x3d */
 499                 {{0, 0},
 500                 {2, 5},
 501                 {0, 0},
 502                 {0, 0}
 503                 }
 504         },
 505         {0, 0, 1, 0,            /* 0x3e */
 506                 {{1, 5},
 507                 {0, 0},
 508                 {0, 0},
 509                 {0, 0}
 510                 }
 511         },
 512         {1, 0, 1, 0,            /* 0x3f */
 513                 {{0, 5},
 514                 {0, 0},
 515                 {0, 0},
 516                 {0, 0}
 517                 }
 518         },
 519         {0, 0, 1, 0,            /* 0x40 */
 520                 {{6, 6},
 521                 {0, 0},
 522                 {0, 0},
 523                 {0, 0}
 524                 }
 525         },
 526         {1, 0, 2, 0,            /* 0x41 */
 527                 {{0, 0},
 528                 {6, 6},
 529                 {0, 0},
 530                 {0, 0}
 531                 }
 532         },
 533         {0, 0, 2, 0,            /* 0x42 */
 534                 {{1, 1},
 535                 {6, 6},
 536                 {0, 0},
 537                 {0, 0}
 538                 }
 539         },
 540         {1, 0, 2, 0,            /* 0x43 */
 541                 {{0, 1},
 542                 {6, 6},
 543                 {0, 0},
 544                 {0, 0}
 545                 }
 546         },
 547         {0, 0, 2, 0,            /* 0x44 */
 548                 {{2, 2},
 549                 {6, 6},
 550                 {0, 0},
 551                 {0, 0}
 552                 }
 553         },
 554         {1, 0, 3, 0,            /* 0x45 */
 555                 {{0, 0},
 556                 {2, 2},
 557                 {6, 6},
 558                 {0, 0}
 559                 }
 560         },
 561         {0, 0, 2, 0,            /* 0x46 */
 562                 {{1, 2},
 563                 {6, 6},
 564                 {0, 0},
 565                 {0, 0}
 566                 }
 567         },
 568         {1, 0, 2, 0,            /* 0x47 */
 569                 {{0, 2},
 570                 {6, 6},
 571                 {0, 0},
 572                 {0, 0}
 573                 }
 574         },
 575         {0, 0, 2, 0,            /* 0x48 */
 576                 {{3, 3},
 577                 {6, 6},
 578                 {0, 0},
 579                 {0, 0}
 580                 }
 581         },
 582         {1, 0, 3, 0,            /* 0x49 */
 583                 {{0, 0},
 584                 {3, 3},
 585                 {6, 6},
 586                 {0, 0}
 587                 }
 588         },
 589         {0, 0, 3, 0,            /* 0x4a */
 590                 {{1, 1},
 591                 {3, 3},
 592                 {6, 6},
 593                 {0, 0}
 594                 }
 595         },
 596         {1, 0, 3, 0,            /* 0x4b */
 597                 {{0, 1},
 598                 {3, 3},
 599                 {6, 6},
 600                 {0, 0}
 601                 }
 602         },
 603         {0, 0, 2, 0,            /* 0x4c */
 604                 {{2, 3},
 605                 {6, 6},
 606                 {0, 0},
 607                 {0, 0}
 608                 }
 609         },
 610         {1, 0, 3, 0,            /* 0x4d */
 611                 {{0, 0},
 612                 {2, 3},
 613                 {6, 6},
 614                 {0, 0}
 615                 }
 616         },
 617         {0, 0, 2, 0,            /* 0x4e */
 618                 {{1, 3},
 619                 {6, 6},
 620                 {0, 0},
 621                 {0, 0}
 622                 }
 623         },
 624         {1, 0, 2, 0,            /* 0x4f */
 625                 {{0, 3},
 626                 {6, 6},
 627                 {0, 0},
 628                 {0, 0}
 629                 }
 630         },
 631         {0, 0, 2, 0,            /* 0x50 */
 632                 {{4, 4},
 633                 {6, 6},
 634                 {0, 0},
 635                 {0, 0}
 636                 }
 637         },
 638         {1, 0, 3, 0,            /* 0x51 */
 639                 {{0, 0},
 640                 {4, 4},
 641                 {6, 6},
 642                 {0, 0}
 643                 }
 644         },
 645         {0, 0, 3, 0,            /* 0x52 */
 646                 {{1, 1},
 647                 {4, 4},
 648                 {6, 6},
 649                 {0, 0}
 650                 }
 651         },
 652         {1, 0, 3, 0,            /* 0x53 */
 653                 {{0, 1},
 654                 {4, 4},
 655                 {6, 6},
 656                 {0, 0}
 657                 }
 658         },
 659         {0, 0, 3, 0,            /* 0x54 */
 660                 {{2, 2},
 661                 {4, 4},
 662                 {6, 6},
 663                 {0, 0}
 664                 }
 665         },
 666         {1, 0, 4, 0,            /* 0x55 */
 667                 {{0, 0},
 668                 {2, 2},
 669                 {4, 4},
 670                 {6, 6}
 671                 }
 672         },
 673         {0, 0, 3, 0,            /* 0x56 */
 674                 {{1, 2},
 675                 {4, 4},
 676                 {6, 6},
 677                 {0, 0}
 678                 }
 679         },
 680         {1, 0, 3, 0,            /* 0x57 */
 681                 {{0, 2},
 682                 {4, 4},
 683                 {6, 6},
 684                 {0, 0}
 685                 }
 686         },
 687         {0, 0, 2, 0,            /* 0x58 */
 688                 {{3, 4},
 689                 {6, 6},
 690                 {0, 0},
 691                 {0, 0}
 692                 }
 693         },
 694         {1, 0, 3, 0,            /* 0x59 */
 695                 {{0, 0},
 696                 {3, 4},
 697                 {6, 6},
 698                 {0, 0}
 699                 }
 700         },
 701         {0, 0, 3, 0,            /* 0x5a */
 702                 {{1, 1},
 703                 {3, 4},
 704                 {6, 6},
 705                 {0, 0}
 706                 }
 707         },
 708         {1, 0, 3, 0,            /* 0x5b */
 709                 {{0, 1},
 710                 {3, 4},
 711                 {6, 6},
 712                 {0, 0}
 713                 }
 714         },
 715         {0, 0, 2, 0,            /* 0x5c */
 716                 {{2, 4},
 717                 {6, 6},
 718                 {0, 0},
 719                 {0, 0}
 720                 }
 721         },
 722         {1, 0, 3, 0,            /* 0x5d */
 723                 {{0, 0},
 724                 {2, 4},
 725                 {6, 6},
 726                 {0, 0}
 727                 }
 728         },
 729         {0, 0, 2, 0,            /* 0x5e */
 730                 {{1, 4},
 731                 {6, 6},
 732                 {0, 0},
 733                 {0, 0}
 734                 }
 735         },
 736         {1, 0, 2, 0,            /* 0x5f */
 737                 {{0, 4},
 738                 {6, 6},
 739                 {0, 0},
 740                 {0, 0}
 741                 }
 742         },
 743         {0, 0, 1, 0,            /* 0x60 */
 744                 {{5, 6},
 745                 {0, 0},
 746                 {0, 0},
 747                 {0, 0}
 748                 }
 749         },
 750         {1, 0, 2, 0,            /* 0x61 */
 751                 {{0, 0},
 752                 {5, 6},
 753                 {0, 0},
 754                 {0, 0}
 755                 }
 756         },
 757         {0, 0, 2, 0,            /* 0x62 */
 758                 {{1, 1},
 759                 {5, 6},
 760                 {0, 0},
 761                 {0, 0}
 762                 }
 763         },
 764         {1, 0, 2, 0,            /* 0x63 */
 765                 {{0, 1},
 766                 {5, 6},
 767                 {0, 0},
 768                 {0, 0}
 769                 }
 770         },
 771         {0, 0, 2, 0,            /* 0x64 */
 772                 {{2, 2},
 773                 {5, 6},
 774                 {0, 0},
 775                 {0, 0}
 776                 }
 777         },
 778         {1, 0, 3, 0,            /* 0x65 */
 779                 {{0, 0},
 780                 {2, 2},
 781                 {5, 6},
 782                 {0, 0}
 783                 }
 784         },
 785         {0, 0, 2, 0,            /* 0x66 */
 786                 {{1, 2},
 787                 {5, 6},
 788                 {0, 0},
 789                 {0, 0}
 790                 }
 791         },
 792         {1, 0, 2, 0,            /* 0x67 */
 793                 {{0, 2},
 794                 {5, 6},
 795                 {0, 0},
 796                 {0, 0}
 797                 }
 798         },
 799         {0, 0, 2, 0,            /* 0x68 */
 800                 {{3, 3},
 801                 {5, 6},
 802                 {0, 0},
 803                 {0, 0}
 804                 }
 805         },
 806         {1, 0, 3, 0,            /* 0x69 */
 807                 {{0, 0},
 808                 {3, 3},
 809                 {5, 6},
 810                 {0, 0}
 811                 }
 812         },
 813         {0, 0, 3, 0,            /* 0x6a */
 814                 {{1, 1},
 815                 {3, 3},
 816                 {5, 6},
 817                 {0, 0}
 818                 }
 819         },
 820         {1, 0, 3, 0,            /* 0x6b */
 821                 {{0, 1},
 822                 {3, 3},
 823                 {5, 6},
 824                 {0, 0}
 825                 }
 826         },
 827         {0, 0, 2, 0,            /* 0x6c */
 828                 {{2, 3},
 829                 {5, 6},
 830                 {0, 0},
 831                 {0, 0}
 832                 }
 833         },
 834         {1, 0, 3, 0,            /* 0x6d */
 835                 {{0, 0},
 836                 {2, 3},
 837                 {5, 6},
 838                 {0, 0}
 839                 }
 840         },
 841         {0, 0, 2, 0,            /* 0x6e */
 842                 {{1, 3},
 843                 {5, 6},
 844                 {0, 0},
 845                 {0, 0}
 846                 }
 847         },
 848         {1, 0, 2, 0,            /* 0x6f */
 849                 {{0, 3},
 850                 {5, 6},
 851                 {0, 0},
 852                 {0, 0}
 853                 }
 854         },
 855         {0, 0, 1, 0,            /* 0x70 */
 856                 {{4, 6},
 857                 {0, 0},
 858                 {0, 0},
 859                 {0, 0}
 860                 }
 861         },
 862         {1, 0, 2, 0,            /* 0x71 */
 863                 {{0, 0},
 864                 {4, 6},
 865                 {0, 0},
 866                 {0, 0}
 867                 }
 868         },
 869         {0, 0, 2, 0,            /* 0x72 */
 870                 {{1, 1},
 871                 {4, 6},
 872                 {0, 0},
 873                 {0, 0}
 874                 }
 875         },
 876         {1, 0, 2, 0,            /* 0x73 */
 877                 {{0, 1},
 878                 {4, 6},
 879                 {0, 0},
 880                 {0, 0}
 881                 }
 882         },
 883         {0, 0, 2, 0,            /* 0x74 */
 884                 {{2, 2},
 885                 {4, 6},
 886                 {0, 0},
 887                 {0, 0}
 888                 }
 889         },
 890         {1, 0, 3, 0,            /* 0x75 */
 891                 {{0, 0},
 892                 {2, 2},
 893                 {4, 6},
 894                 {0, 0}
 895                 }
 896         },
 897         {0, 0, 2, 0,            /* 0x76 */
 898                 {{1, 2},
 899                 {4, 6},
 900                 {0, 0},
 901                 {0, 0}
 902                 }
 903         },
 904         {1, 0, 2, 0,            /* 0x77 */
 905                 {{0, 2},
 906                 {4, 6},
 907                 {0, 0},
 908                 {0, 0}
 909                 }
 910         },
 911         {0, 0, 1, 0,            /* 0x78 */
 912                 {{3, 6},
 913                 {0, 0},
 914                 {0, 0},
 915                 {0, 0}
 916                 }
 917         },
 918         {1, 0, 2, 0,            /* 0x79 */
 919                 {{0, 0},
 920                 {3, 6},
 921                 {0, 0},
 922                 {0, 0}
 923                 }
 924         },
 925         {0, 0, 2, 0,            /* 0x7a */
 926                 {{1, 1},
 927                 {3, 6},
 928                 {0, 0},
 929                 {0, 0}
 930                 }
 931         },
 932         {1, 0, 2, 0,            /* 0x7b */
 933                 {{0, 1},
 934                 {3, 6},
 935                 {0, 0},
 936                 {0, 0}
 937                 }
 938         },
 939         {0, 0, 1, 0,            /* 0x7c */
 940                 {{2, 6},
 941                 {0, 0},
 942                 {0, 0},
 943                 {0, 0}
 944                 }
 945         },
 946         {1, 0, 2, 0,            /* 0x7d */
 947                 {{0, 0},
 948                 {2, 6},
 949                 {0, 0},
 950                 {0, 0}
 951                 }
 952         },
 953         {0, 0, 1, 0,            /* 0x7e */
 954                 {{1, 6},
 955                 {0, 0},
 956                 {0, 0},
 957                 {0, 0}
 958                 }
 959         },
 960         {1, 0, 1, 0,            /* 0x7f */
 961                 {{0, 6},
 962                 {0, 0},
 963                 {0, 0},
 964                 {0, 0}
 965                 }
 966         },
 967         {0, 1, 1, 0,            /* 0x80 */
 968                 {{7, 7},
 969                 {0, 0},
 970                 {0, 0},
 971                 {0, 0}
 972                 }
 973         },
 974         {1, 1, 2, 0,            /* 0x81 */
 975                 {{0, 0},
 976                 {7, 7},
 977                 {0, 0},
 978                 {0, 0}
 979                 }
 980         },
 981         {0, 1, 2, 0,            /* 0x82 */
 982                 {{1, 1},
 983                 {7, 7},
 984                 {0, 0},
 985                 {0, 0}
 986                 }
 987         },
 988         {1, 1, 2, 0,            /* 0x83 */
 989                 {{0, 1},
 990                 {7, 7},
 991                 {0, 0},
 992                 {0, 0}
 993                 }
 994         },
 995         {0, 1, 2, 0,            /* 0x84 */
 996                 {{2, 2},
 997                 {7, 7},
 998                 {0, 0},
 999                 {0, 0}
1000                 }
1001         },
1002         {1, 1, 3, 0,            /* 0x85 */
1003                 {{0, 0},
1004                 {2, 2},
1005                 {7, 7},
1006                 {0, 0}
1007                 }
1008         },
1009         {0, 1, 2, 0,            /* 0x86 */
1010                 {{1, 2},
1011                 {7, 7},
1012                 {0, 0},
1013                 {0, 0}
1014                 }
1015         },
1016         {1, 1, 2, 0,            /* 0x87 */
1017                 {{0, 2},
1018                 {7, 7},
1019                 {0, 0},
1020                 {0, 0}
1021                 }
1022         },
1023         {0, 1, 2, 0,            /* 0x88 */
1024                 {{3, 3},
1025                 {7, 7},
1026                 {0, 0},
1027                 {0, 0}
1028                 }
1029         },
1030         {1, 1, 3, 0,            /* 0x89 */
1031                 {{0, 0},
1032                 {3, 3},
1033                 {7, 7},
1034                 {0, 0}
1035                 }
1036         },
1037         {0, 1, 3, 0,            /* 0x8a */
1038                 {{1, 1},
1039                 {3, 3},
1040                 {7, 7},
1041                 {0, 0}
1042                 }
1043         },
1044         {1, 1, 3, 0,            /* 0x8b */
1045                 {{0, 1},
1046                 {3, 3},
1047                 {7, 7},
1048                 {0, 0}
1049                 }
1050         },
1051         {0, 1, 2, 0,            /* 0x8c */
1052                 {{2, 3},
1053                 {7, 7},
1054                 {0, 0},
1055                 {0, 0}
1056                 }
1057         },
1058         {1, 1, 3, 0,            /* 0x8d */
1059                 {{0, 0},
1060                 {2, 3},
1061                 {7, 7},
1062                 {0, 0}
1063                 }
1064         },
1065         {0, 1, 2, 0,            /* 0x8e */
1066                 {{1, 3},
1067                 {7, 7},
1068                 {0, 0},
1069                 {0, 0}
1070                 }
1071         },
1072         {1, 1, 2, 0,            /* 0x8f */
1073                 {{0, 3},
1074                 {7, 7},
1075                 {0, 0},
1076                 {0, 0}
1077                 }
1078         },
1079         {0, 1, 2, 0,            /* 0x90 */
1080                 {{4, 4},
1081                 {7, 7},
1082                 {0, 0},
1083                 {0, 0}
1084                 }
1085         },
1086         {1, 1, 3, 0,            /* 0x91 */
1087                 {{0, 0},
1088                 {4, 4},
1089                 {7, 7},
1090                 {0, 0}
1091                 }
1092         },
1093         {0, 1, 3, 0,            /* 0x92 */
1094                 {{1, 1},
1095                 {4, 4},
1096                 {7, 7},
1097                 {0, 0}
1098                 }
1099         },
1100         {1, 1, 3, 0,            /* 0x93 */
1101                 {{0, 1},
1102                 {4, 4},
1103                 {7, 7},
1104                 {0, 0}
1105                 }
1106         },
1107         {0, 1, 3, 0,            /* 0x94 */
1108                 {{2, 2},
1109                 {4, 4},
1110                 {7, 7},
1111                 {0, 0}
1112                 }
1113         },
1114         {1, 1, 4, 0,            /* 0x95 */
1115                 {{0, 0},
1116                 {2, 2},
1117                 {4, 4},
1118                 {7, 7}
1119                 }
1120         },
1121         {0, 1, 3, 0,            /* 0x96 */
1122                 {{1, 2},
1123                 {4, 4},
1124                 {7, 7},
1125                 {0, 0}
1126                 }
1127         },
1128         {1, 1, 3, 0,            /* 0x97 */
1129                 {{0, 2},
1130                 {4, 4},
1131                 {7, 7},
1132                 {0, 0}
1133                 }
1134         },
1135         {0, 1, 2, 0,            /* 0x98 */
1136                 {{3, 4},
1137                 {7, 7},
1138                 {0, 0},
1139                 {0, 0}
1140                 }
1141         },
1142         {1, 1, 3, 0,            /* 0x99 */
1143                 {{0, 0},
1144                 {3, 4},
1145                 {7, 7},
1146                 {0, 0}
1147                 }
1148         },
1149         {0, 1, 3, 0,            /* 0x9a */
1150                 {{1, 1},
1151                 {3, 4},
1152                 {7, 7},
1153                 {0, 0}
1154                 }
1155         },
1156         {1, 1, 3, 0,            /* 0x9b */
1157                 {{0, 1},
1158                 {3, 4},
1159                 {7, 7},
1160                 {0, 0}
1161                 }
1162         },
1163         {0, 1, 2, 0,            /* 0x9c */
1164                 {{2, 4},
1165                 {7, 7},
1166                 {0, 0},
1167                 {0, 0}
1168                 }
1169         },
1170         {1, 1, 3, 0,            /* 0x9d */
1171                 {{0, 0},
1172                 {2, 4},
1173                 {7, 7},
1174                 {0, 0}
1175                 }
1176         },
1177         {0, 1, 2, 0,            /* 0x9e */
1178                 {{1, 4},
1179                 {7, 7},
1180                 {0, 0},
1181                 {0, 0}
1182                 }
1183         },
1184         {1, 1, 2, 0,            /* 0x9f */
1185                 {{0, 4},
1186                 {7, 7},
1187                 {0, 0},
1188                 {0, 0}
1189                 }
1190         },
1191         {0, 1, 2, 0,            /* 0xa0 */
1192                 {{5, 5},
1193                 {7, 7},
1194                 {0, 0},
1195                 {0, 0}
1196                 }
1197         },
1198         {1, 1, 3, 0,            /* 0xa1 */
1199                 {{0, 0},
1200                 {5, 5},
1201                 {7, 7},
1202                 {0, 0}
1203                 }
1204         },
1205         {0, 1, 3, 0,            /* 0xa2 */
1206                 {{1, 1},
1207                 {5, 5},
1208                 {7, 7},
1209                 {0, 0}
1210                 }
1211         },
1212         {1, 1, 3, 0,            /* 0xa3 */
1213                 {{0, 1},
1214                 {5, 5},
1215                 {7, 7},
1216                 {0, 0}
1217                 }
1218         },
1219         {0, 1, 3, 0,            /* 0xa4 */
1220                 {{2, 2},
1221                 {5, 5},
1222                 {7, 7},
1223                 {0, 0}
1224                 }
1225         },
1226         {1, 1, 4, 0,            /* 0xa5 */
1227                 {{0, 0},
1228                 {2, 2},
1229                 {5, 5},
1230                 {7, 7}
1231                 }
1232         },
1233         {0, 1, 3, 0,            /* 0xa6 */
1234                 {{1, 2},
1235                 {5, 5},
1236                 {7, 7},
1237                 {0, 0}
1238                 }
1239         },
1240         {1, 1, 3, 0,            /* 0xa7 */
1241                 {{0, 2},
1242                 {5, 5},
1243                 {7, 7},
1244                 {0, 0}
1245                 }
1246         },
1247         {0, 1, 3, 0,            /* 0xa8 */
1248                 {{3, 3},
1249                 {5, 5},
1250                 {7, 7},
1251                 {0, 0}
1252                 }
1253         },
1254         {1, 1, 4, 0,            /* 0xa9 */
1255                 {{0, 0},
1256                 {3, 3},
1257                 {5, 5},
1258                 {7, 7}
1259                 }
1260         },
1261         {0, 1, 4, 0,            /* 0xaa */
1262                 {{1, 1},
1263                 {3, 3},
1264                 {5, 5},
1265                 {7, 7}
1266                 }
1267         },
1268         {1, 1, 4, 0,            /* 0xab */
1269                 {{0, 1},
1270                 {3, 3},
1271                 {5, 5},
1272                 {7, 7}
1273                 }
1274         },
1275         {0, 1, 3, 0,            /* 0xac */
1276                 {{2, 3},
1277                 {5, 5},
1278                 {7, 7},
1279                 {0, 0}
1280                 }
1281         },
1282         {1, 1, 4, 0,            /* 0xad */
1283                 {{0, 0},
1284                 {2, 3},
1285                 {5, 5},
1286                 {7, 7}
1287                 }
1288         },
1289         {0, 1, 3, 0,            /* 0xae */
1290                 {{1, 3},
1291                 {5, 5},
1292                 {7, 7},
1293                 {0, 0}
1294                 }
1295         },
1296         {1, 1, 3, 0,            /* 0xaf */
1297                 {{0, 3},
1298                 {5, 5},
1299                 {7, 7},
1300                 {0, 0}
1301                 }
1302         },
1303         {0, 1, 2, 0,            /* 0xb0 */
1304                 {{4, 5},
1305                 {7, 7},
1306                 {0, 0},
1307                 {0, 0}
1308                 }
1309         },
1310         {1, 1, 3, 0,            /* 0xb1 */
1311                 {{0, 0},
1312                 {4, 5},
1313                 {7, 7},
1314                 {0, 0}
1315                 }
1316         },
1317         {0, 1, 3, 0,            /* 0xb2 */
1318                 {{1, 1},
1319                 {4, 5},
1320                 {7, 7},
1321                 {0, 0}
1322                 }
1323         },
1324         {1, 1, 3, 0,            /* 0xb3 */
1325                 {{0, 1},
1326                 {4, 5},
1327                 {7, 7},
1328                 {0, 0}
1329                 }
1330         },
1331         {0, 1, 3, 0,            /* 0xb4 */
1332                 {{2, 2},
1333                 {4, 5},
1334                 {7, 7},
1335                 {0, 0}
1336                 }
1337         },
1338         {1, 1, 4, 0,            /* 0xb5 */
1339                 {{0, 0},
1340                 {2, 2},
1341                 {4, 5},
1342                 {7, 7}
1343                 }
1344         },
1345         {0, 1, 3, 0,            /* 0xb6 */
1346                 {{1, 2},
1347                 {4, 5},
1348                 {7, 7},
1349                 {0, 0}
1350                 }
1351         },
1352         {1, 1, 3, 0,            /* 0xb7 */
1353                 {{0, 2},
1354                 {4, 5},
1355                 {7, 7},
1356                 {0, 0}
1357                 }
1358         },
1359         {0, 1, 2, 0,            /* 0xb8 */
1360                 {{3, 5},
1361                 {7, 7},
1362                 {0, 0},
1363                 {0, 0}
1364                 }
1365         },
1366         {1, 1, 3, 0,            /* 0xb9 */
1367                 {{0, 0},
1368                 {3, 5},
1369                 {7, 7},
1370                 {0, 0}
1371                 }
1372         },
1373         {0, 1, 3, 0,            /* 0xba */
1374                 {{1, 1},
1375                 {3, 5},
1376                 {7, 7},
1377                 {0, 0}
1378                 }
1379         },
1380         {1, 1, 3, 0,            /* 0xbb */
1381                 {{0, 1},
1382                 {3, 5},
1383                 {7, 7},
1384                 {0, 0}
1385                 }
1386         },
1387         {0, 1, 2, 0,            /* 0xbc */
1388                 {{2, 5},
1389                 {7, 7},
1390                 {0, 0},
1391                 {0, 0}
1392                 }
1393         },
1394         {1, 1, 3, 0,            /* 0xbd */
1395                 {{0, 0},
1396                 {2, 5},
1397                 {7, 7},
1398                 {0, 0}
1399                 }
1400         },
1401         {0, 1, 2, 0,            /* 0xbe */
1402                 {{1, 5},
1403                 {7, 7},
1404                 {0, 0},
1405                 {0, 0}
1406                 }
1407         },
1408         {1, 1, 2, 0,            /* 0xbf */
1409                 {{0, 5},
1410                 {7, 7},
1411                 {0, 0},
1412                 {0, 0}
1413                 }
1414         },
1415         {0, 1, 1, 0,            /* 0xc0 */
1416                 {{6, 7},
1417                 {0, 0},
1418                 {0, 0},
1419                 {0, 0}
1420                 }
1421         },
1422         {1, 1, 2, 0,            /* 0xc1 */
1423                 {{0, 0},
1424                 {6, 7},
1425                 {0, 0},
1426                 {0, 0}
1427                 }
1428         },
1429         {0, 1, 2, 0,            /* 0xc2 */
1430                 {{1, 1},
1431                 {6, 7},
1432                 {0, 0},
1433                 {0, 0}
1434                 }
1435         },
1436         {1, 1, 2, 0,            /* 0xc3 */
1437                 {{0, 1},
1438                 {6, 7},
1439                 {0, 0},
1440                 {0, 0}
1441                 }
1442         },
1443         {0, 1, 2, 0,            /* 0xc4 */
1444                 {{2, 2},
1445                 {6, 7},
1446                 {0, 0},
1447                 {0, 0}
1448                 }
1449         },
1450         {1, 1, 3, 0,            /* 0xc5 */
1451                 {{0, 0},
1452                 {2, 2},
1453                 {6, 7},
1454                 {0, 0}
1455                 }
1456         },
1457         {0, 1, 2, 0,            /* 0xc6 */
1458                 {{1, 2},
1459                 {6, 7},
1460                 {0, 0},
1461                 {0, 0}
1462                 }
1463         },
1464         {1, 1, 2, 0,            /* 0xc7 */
1465                 {{0, 2},
1466                 {6, 7},
1467                 {0, 0},
1468                 {0, 0}
1469                 }
1470         },
1471         {0, 1, 2, 0,            /* 0xc8 */
1472                 {{3, 3},
1473                 {6, 7},
1474                 {0, 0},
1475                 {0, 0}
1476                 }
1477         },
1478         {1, 1, 3, 0,            /* 0xc9 */
1479                 {{0, 0},
1480                 {3, 3},
1481                 {6, 7},
1482                 {0, 0}
1483                 }
1484         },
1485         {0, 1, 3, 0,            /* 0xca */
1486                 {{1, 1},
1487                 {3, 3},
1488                 {6, 7},
1489                 {0, 0}
1490                 }
1491         },
1492         {1, 1, 3, 0,            /* 0xcb */
1493                 {{0, 1},
1494                 {3, 3},
1495                 {6, 7},
1496                 {0, 0}
1497                 }
1498         },
1499         {0, 1, 2, 0,            /* 0xcc */
1500                 {{2, 3},
1501                 {6, 7},
1502                 {0, 0},
1503                 {0, 0}
1504                 }
1505         },
1506         {1, 1, 3, 0,            /* 0xcd */
1507                 {{0, 0},
1508                 {2, 3},
1509                 {6, 7},
1510                 {0, 0}
1511                 }
1512         },
1513         {0, 1, 2, 0,            /* 0xce */
1514                 {{1, 3},
1515                 {6, 7},
1516                 {0, 0},
1517                 {0, 0}
1518                 }
1519         },
1520         {1, 1, 2, 0,            /* 0xcf */
1521                 {{0, 3},
1522                 {6, 7},
1523                 {0, 0},
1524                 {0, 0}
1525                 }
1526         },
1527         {0, 1, 2, 0,            /* 0xd0 */
1528                 {{4, 4},
1529                 {6, 7},
1530                 {0, 0},
1531                 {0, 0}
1532                 }
1533         },
1534         {1, 1, 3, 0,            /* 0xd1 */
1535                 {{0, 0},
1536                 {4, 4},
1537                 {6, 7},
1538                 {0, 0}
1539                 }
1540         },
1541         {0, 1, 3, 0,            /* 0xd2 */
1542                 {{1, 1},
1543                 {4, 4},
1544                 {6, 7},
1545                 {0, 0}
1546                 }
1547         },
1548         {1, 1, 3, 0,            /* 0xd3 */
1549                 {{0, 1},
1550                 {4, 4},
1551                 {6, 7},
1552                 {0, 0}
1553                 }
1554         },
1555         {0, 1, 3, 0,            /* 0xd4 */
1556                 {{2, 2},
1557                 {4, 4},
1558                 {6, 7},
1559                 {0, 0}
1560                 }
1561         },
1562         {1, 1, 4, 0,            /* 0xd5 */
1563                 {{0, 0},
1564                 {2, 2},
1565                 {4, 4},
1566                 {6, 7}
1567                 }
1568         },
1569         {0, 1, 3, 0,            /* 0xd6 */
1570                 {{1, 2},
1571                 {4, 4},
1572                 {6, 7},
1573                 {0, 0}
1574                 }
1575         },
1576         {1, 1, 3, 0,            /* 0xd7 */
1577                 {{0, 2},
1578                 {4, 4},
1579                 {6, 7},
1580                 {0, 0}
1581                 }
1582         },
1583         {0, 1, 2, 0,            /* 0xd8 */
1584                 {{3, 4},
1585                 {6, 7},
1586                 {0, 0},
1587                 {0, 0}
1588                 }
1589         },
1590         {1, 1, 3, 0,            /* 0xd9 */
1591                 {{0, 0},
1592                 {3, 4},
1593                 {6, 7},
1594                 {0, 0}
1595                 }
1596         },
1597         {0, 1, 3, 0,            /* 0xda */
1598                 {{1, 1},
1599                 {3, 4},
1600                 {6, 7},
1601                 {0, 0}
1602                 }
1603         },
1604         {1, 1, 3, 0,            /* 0xdb */
1605                 {{0, 1},
1606                 {3, 4},
1607                 {6, 7},
1608                 {0, 0}
1609                 }
1610         },
1611         {0, 1, 2, 0,            /* 0xdc */
1612                 {{2, 4},
1613                 {6, 7},
1614                 {0, 0},
1615                 {0, 0}
1616                 }
1617         },
1618         {1, 1, 3, 0,            /* 0xdd */
1619                 {{0, 0},
1620                 {2, 4},
1621                 {6, 7},
1622                 {0, 0}
1623                 }
1624         },
1625         {0, 1, 2, 0,            /* 0xde */
1626                 {{1, 4},
1627                 {6, 7},
1628                 {0, 0},
1629                 {0, 0}
1630                 }
1631         },
1632         {1, 1, 2, 0,            /* 0xdf */
1633                 {{0, 4},
1634                 {6, 7},
1635                 {0, 0},
1636                 {0, 0}
1637                 }
1638         },
1639         {0, 1, 1, 0,            /* 0xe0 */
1640                 {{5, 7},
1641                 {0, 0},
1642                 {0, 0},
1643                 {0, 0}
1644                 }
1645         },
1646         {1, 1, 2, 0,            /* 0xe1 */
1647                 {{0, 0},
1648                 {5, 7},
1649                 {0, 0},
1650                 {0, 0}
1651                 }
1652         },
1653         {0, 1, 2, 0,            /* 0xe2 */
1654                 {{1, 1},
1655                 {5, 7},
1656                 {0, 0},
1657                 {0, 0}
1658                 }
1659         },
1660         {1, 1, 2, 0,            /* 0xe3 */
1661                 {{0, 1},
1662                 {5, 7},
1663                 {0, 0},
1664                 {0, 0}
1665                 }
1666         },
1667         {0, 1, 2, 0,            /* 0xe4 */
1668                 {{2, 2},
1669                 {5, 7},
1670                 {0, 0},
1671                 {0, 0}
1672                 }
1673         },
1674         {1, 1, 3, 0,            /* 0xe5 */
1675                 {{0, 0},
1676                 {2, 2},
1677                 {5, 7},
1678                 {0, 0}
1679                 }
1680         },
1681         {0, 1, 2, 0,            /* 0xe6 */
1682                 {{1, 2},
1683                 {5, 7},
1684                 {0, 0},
1685                 {0, 0}
1686                 }
1687         },
1688         {1, 1, 2, 0,            /* 0xe7 */
1689                 {{0, 2},
1690                 {5, 7},
1691                 {0, 0},
1692                 {0, 0}
1693                 }
1694         },
1695         {0, 1, 2, 0,            /* 0xe8 */
1696                 {{3, 3},
1697                 {5, 7},
1698                 {0, 0},
1699                 {0, 0}
1700                 }
1701         },
1702         {1, 1, 3, 0,            /* 0xe9 */
1703                 {{0, 0},
1704                 {3, 3},
1705                 {5, 7},
1706                 {0, 0}
1707                 }
1708         },
1709         {0, 1, 3, 0,            /* 0xea */
1710                 {{1, 1},
1711                 {3, 3},
1712                 {5, 7},
1713                 {0, 0}
1714                 }
1715         },
1716         {1, 1, 3, 0,            /* 0xeb */
1717                 {{0, 1},
1718                 {3, 3},
1719                 {5, 7},
1720                 {0, 0}
1721                 }
1722         },
1723         {0, 1, 2, 0,            /* 0xec */
1724                 {{2, 3},
1725                 {5, 7},
1726                 {0, 0},
1727                 {0, 0}
1728                 }
1729         },
1730         {1, 1, 3, 0,            /* 0xed */
1731                 {{0, 0},
1732                 {2, 3},
1733                 {5, 7},
1734                 {0, 0}
1735                 }
1736         },
1737         {0, 1, 2, 0,            /* 0xee */
1738                 {{1, 3},
1739                 {5, 7},
1740                 {0, 0},
1741                 {0, 0}
1742                 }
1743         },
1744         {1, 1, 2, 0,            /* 0xef */
1745                 {{0, 3},
1746                 {5, 7},
1747                 {0, 0},
1748                 {0, 0}
1749                 }
1750         },
1751         {0, 1, 1, 0,            /* 0xf0 */
1752                 {{4, 7},
1753                 {0, 0},
1754                 {0, 0},
1755                 {0, 0}
1756                 }
1757         },
1758         {1, 1, 2, 0,            /* 0xf1 */
1759                 {{0, 0},
1760                 {4, 7},
1761                 {0, 0},
1762                 {0, 0}
1763                 }
1764         },
1765         {0, 1, 2, 0,            /* 0xf2 */
1766                 {{1, 1},
1767                 {4, 7},
1768                 {0, 0},
1769                 {0, 0}
1770                 }
1771         },
1772         {1, 1, 2, 0,            /* 0xf3 */
1773                 {{0, 1},
1774                 {4, 7},
1775                 {0, 0},
1776                 {0, 0}
1777                 }
1778         },
1779         {0, 1, 2, 0,            /* 0xf4 */
1780                 {{2, 2},
1781                 {4, 7},
1782                 {0, 0},
1783                 {0, 0}
1784                 }
1785         },
1786         {1, 1, 3, 0,            /* 0xf5 */
1787                 {{0, 0},
1788                 {2, 2},
1789                 {4, 7},
1790                 {0, 0}
1791                 }
1792         },
1793         {0, 1, 2, 0,            /* 0xf6 */
1794                 {{1, 2},
1795                 {4, 7},
1796                 {0, 0},
1797                 {0, 0}
1798                 }
1799         },
1800         {1, 1, 2, 0,            /* 0xf7 */
1801                 {{0, 2},
1802                 {4, 7},
1803                 {0, 0},
1804                 {0, 0}
1805                 }
1806         },
1807         {0, 1, 1, 0,            /* 0xf8 */
1808                 {{3, 7},
1809                 {0, 0},
1810                 {0, 0},
1811                 {0, 0}
1812                 }
1813         },
1814         {1, 1, 2, 0,            /* 0xf9 */
1815                 {{0, 0},
1816                 {3, 7},
1817                 {0, 0},
1818                 {0, 0}
1819                 }
1820         },
1821         {0, 1, 2, 0,            /* 0xfa */
1822                 {{1, 1},
1823                 {3, 7},
1824                 {0, 0},
1825                 {0, 0}
1826                 }
1827         },
1828         {1, 1, 2, 0,            /* 0xfb */
1829                 {{0, 1},
1830                 {3, 7},
1831                 {0, 0},
1832                 {0, 0}
1833                 }
1834         },
1835         {0, 1, 1, 0,            /* 0xfc */
1836                 {{2, 7},
1837                 {0, 0},
1838                 {0, 0},
1839                 {0, 0}
1840                 }
1841         },
1842         {1, 1, 2, 0,            /* 0xfd */
1843                 {{0, 0},
1844                 {2, 7},
1845                 {0, 0},
1846                 {0, 0}
1847                 }
1848         },
1849         {0, 1, 1, 0,            /* 0xfe */
1850                 {{1, 7},
1851                 {0, 0},
1852                 {0, 0},
1853                 {0, 0}
1854                 }
1855         },
1856         {1, 1, 1, 0,            /* 0xff */
1857                 {{0, 7},
1858                 {0, 0},
1859                 {0, 0},
1860                 {0, 0}
1861                 }
1862         }
1863 };
1864
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *paramh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946 #endif
1947
1948         switch (ifa->address.sa.sa_family) {
1949 #ifdef INET
1950         case AF_INET:
1951                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952                 break;
1953 #endif
1954 #ifdef INET6
1955         case AF_INET6:
1956                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957                 break;
1958 #endif
1959         default:
1960                 return (m);
1961         }
1962 #if defined(INET) || defined(INET6)
1963         if (M_TRAILINGSPACE(m) >= plen) {
1964                 /* easy side we just drop it on the end */
1965                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 paramh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = &ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1991                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         paramh->param_length = htons(plen);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += plen;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = &ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2006                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         paramh->param_length = htons(plen);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += plen;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         if (len != NULL) {
2020                 *len += plen;
2021         }
2022         return (mret);
2023 #endif
2024 }
2025
2026
2027 struct mbuf *
2028 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2029     struct sctp_scoping *scope,
2030     struct mbuf *m_at, int cnt_inits_to,
2031     uint16_t *padding_len, uint16_t *chunk_len)
2032 {
2033         struct sctp_vrf *vrf = NULL;
2034         int cnt, limit_out = 0, total_count;
2035         uint32_t vrf_id;
2036
2037         vrf_id = inp->def_vrf_id;
2038         SCTP_IPI_ADDR_RLOCK();
2039         vrf = sctp_find_vrf(vrf_id);
2040         if (vrf == NULL) {
2041                 SCTP_IPI_ADDR_RUNLOCK();
2042                 return (m_at);
2043         }
2044         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2045                 struct sctp_ifa *sctp_ifap;
2046                 struct sctp_ifn *sctp_ifnp;
2047
2048                 cnt = cnt_inits_to;
2049                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2050                         limit_out = 1;
2051                         cnt = SCTP_ADDRESS_LIMIT;
2052                         goto skip_count;
2053                 }
2054                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2055                         if ((scope->loopback_scope == 0) &&
2056                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2057                                 /*
2058                                  * Skip loopback devices if loopback_scope
2059                                  * not set
2060                                  */
2061                                 continue;
2062                         }
2063                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2064 #ifdef INET
2065                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2066                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2067                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2068                                         continue;
2069                                 }
2070 #endif
2071 #ifdef INET6
2072                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2073                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2074                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2075                                         continue;
2076                                 }
2077 #endif
2078                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2079                                         continue;
2080                                 }
2081                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2082                                         continue;
2083                                 }
2084                                 cnt++;
2085                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2086                                         break;
2087                                 }
2088                         }
2089                         if (cnt > SCTP_ADDRESS_LIMIT) {
2090                                 break;
2091                         }
2092                 }
2093 skip_count:
2094                 if (cnt > 1) {
2095                         total_count = 0;
2096                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2097                                 cnt = 0;
2098                                 if ((scope->loopback_scope == 0) &&
2099                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2100                                         /*
2101                                          * Skip loopback devices if
2102                                          * loopback_scope not set
2103                                          */
2104                                         continue;
2105                                 }
2106                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2107 #ifdef INET
2108                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2109                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2110                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2111                                                 continue;
2112                                         }
2113 #endif
2114 #ifdef INET6
2115                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2116                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2117                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2118                                                 continue;
2119                                         }
2120 #endif
2121                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2122                                                 continue;
2123                                         }
2124                                         if (sctp_is_address_in_scope(sctp_ifap,
2125                                             scope, 0) == 0) {
2126                                                 continue;
2127                                         }
2128                                         if ((chunk_len != NULL) &&
2129                                             (padding_len != NULL) &&
2130                                             (*padding_len > 0)) {
2131                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2132                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2133                                                 *chunk_len += *padding_len;
2134                                                 *padding_len = 0;
2135                                         }
2136                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2137                                         if (limit_out) {
2138                                                 cnt++;
2139                                                 total_count++;
2140                                                 if (cnt >= 2) {
2141                                                         /*
2142                                                          * two from each
2143                                                          * address
2144                                                          */
2145                                                         break;
2146                                                 }
2147                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2148                                                         /* No more addresses */
2149                                                         break;
2150                                                 }
2151                                         }
2152                                 }
2153                         }
2154                 }
2155         } else {
2156                 struct sctp_laddr *laddr;
2157
2158                 cnt = cnt_inits_to;
2159                 /* First, how many ? */
2160                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2161                         if (laddr->ifa == NULL) {
2162                                 continue;
2163                         }
2164                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2165                                 /*
2166                                  * Address being deleted by the system, dont
2167                                  * list.
2168                                  */
2169                                 continue;
2170                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2171                                 /*
2172                                  * Address being deleted on this ep don't
2173                                  * list.
2174                                  */
2175                                 continue;
2176                         }
2177                         if (sctp_is_address_in_scope(laddr->ifa,
2178                             scope, 1) == 0) {
2179                                 continue;
2180                         }
2181                         cnt++;
2182                 }
2183                 /*
2184                  * To get through a NAT we only list addresses if we have
2185                  * more than one. That way if you just bind a single address
2186                  * we let the source of the init dictate our address.
2187                  */
2188                 if (cnt > 1) {
2189                         cnt = cnt_inits_to;
2190                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2191                                 if (laddr->ifa == NULL) {
2192                                         continue;
2193                                 }
2194                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2195                                         continue;
2196                                 }
2197                                 if (sctp_is_address_in_scope(laddr->ifa,
2198                                     scope, 0) == 0) {
2199                                         continue;
2200                                 }
2201                                 if ((chunk_len != NULL) &&
2202                                     (padding_len != NULL) &&
2203                                     (*padding_len > 0)) {
2204                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2205                                         SCTP_BUF_LEN(m_at) += *padding_len;
2206                                         *chunk_len += *padding_len;
2207                                         *padding_len = 0;
2208                                 }
2209                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2210                                 cnt++;
2211                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2212                                         break;
2213                                 }
2214                         }
2215                 }
2216         }
2217         SCTP_IPI_ADDR_RUNLOCK();
2218         return (m_at);
2219 }
2220
2221 static struct sctp_ifa *
2222 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2223     uint8_t dest_is_loop,
2224     uint8_t dest_is_priv,
2225     sa_family_t fam)
2226 {
2227         uint8_t dest_is_global = 0;
2228
2229         /* dest_is_priv is true if destination is a private address */
2230         /* dest_is_loop is true if destination is a loopback addresses */
2231
2232         /**
2233          * Here we determine if its a preferred address. A preferred address
2234          * means it is the same scope or higher scope then the destination.
2235          * L = loopback, P = private, G = global
2236          * -----------------------------------------
2237          *    src    |  dest | result
2238          *  ----------------------------------------
2239          *     L     |    L  |    yes
2240          *  -----------------------------------------
2241          *     P     |    L  |    yes-v4 no-v6
2242          *  -----------------------------------------
2243          *     G     |    L  |    yes-v4 no-v6
2244          *  -----------------------------------------
2245          *     L     |    P  |    no
2246          *  -----------------------------------------
2247          *     P     |    P  |    yes
2248          *  -----------------------------------------
2249          *     G     |    P  |    no
2250          *   -----------------------------------------
2251          *     L     |    G  |    no
2252          *   -----------------------------------------
2253          *     P     |    G  |    no
2254          *    -----------------------------------------
2255          *     G     |    G  |    yes
2256          *    -----------------------------------------
2257          */
2258
2259         if (ifa->address.sa.sa_family != fam) {
2260                 /* forget mis-matched family */
2261                 return (NULL);
2262         }
2263         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2264                 dest_is_global = 1;
2265         }
2266         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2267         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2268         /* Ok the address may be ok */
2269 #ifdef INET6
2270         if (fam == AF_INET6) {
2271                 /* ok to use deprecated addresses? no lets not! */
2272                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2273                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2274                         return (NULL);
2275                 }
2276                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2277                         if (dest_is_loop) {
2278                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2279                                 return (NULL);
2280                         }
2281                 }
2282                 if (ifa->src_is_glob) {
2283                         if (dest_is_loop) {
2284                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2285                                 return (NULL);
2286                         }
2287                 }
2288         }
2289 #endif
2290         /*
2291          * Now that we know what is what, implement or table this could in
2292          * theory be done slicker (it used to be), but this is
2293          * straightforward and easier to validate :-)
2294          */
2295         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2296             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2297         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2298             dest_is_loop, dest_is_priv, dest_is_global);
2299
2300         if ((ifa->src_is_loop) && (dest_is_priv)) {
2301                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2302                 return (NULL);
2303         }
2304         if ((ifa->src_is_glob) && (dest_is_priv)) {
2305                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2306                 return (NULL);
2307         }
2308         if ((ifa->src_is_loop) && (dest_is_global)) {
2309                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2310                 return (NULL);
2311         }
2312         if ((ifa->src_is_priv) && (dest_is_global)) {
2313                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2314                 return (NULL);
2315         }
2316         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2317         /* its a preferred address */
2318         return (ifa);
2319 }
2320
2321 static struct sctp_ifa *
2322 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2323     uint8_t dest_is_loop,
2324     uint8_t dest_is_priv,
2325     sa_family_t fam)
2326 {
2327         uint8_t dest_is_global = 0;
2328
2329         /**
2330          * Here we determine if its a acceptable address. A acceptable
2331          * address means it is the same scope or higher scope but we can
2332          * allow for NAT which means its ok to have a global dest and a
2333          * private src.
2334          *
2335          * L = loopback, P = private, G = global
2336          * -----------------------------------------
2337          *  src    |  dest | result
2338          * -----------------------------------------
2339          *   L     |   L   |    yes
2340          *  -----------------------------------------
2341          *   P     |   L   |    yes-v4 no-v6
2342          *  -----------------------------------------
2343          *   G     |   L   |    yes
2344          * -----------------------------------------
2345          *   L     |   P   |    no
2346          * -----------------------------------------
2347          *   P     |   P   |    yes
2348          * -----------------------------------------
2349          *   G     |   P   |    yes - May not work
2350          * -----------------------------------------
2351          *   L     |   G   |    no
2352          * -----------------------------------------
2353          *   P     |   G   |    yes - May not work
2354          * -----------------------------------------
2355          *   G     |   G   |    yes
2356          * -----------------------------------------
2357          */
2358
2359         if (ifa->address.sa.sa_family != fam) {
2360                 /* forget non matching family */
2361                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2362                     ifa->address.sa.sa_family, fam);
2363                 return (NULL);
2364         }
2365         /* Ok the address may be ok */
2366         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2367         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2368             dest_is_loop, dest_is_priv);
2369         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2370                 dest_is_global = 1;
2371         }
2372 #ifdef INET6
2373         if (fam == AF_INET6) {
2374                 /* ok to use deprecated addresses? */
2375                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2376                         return (NULL);
2377                 }
2378                 if (ifa->src_is_priv) {
2379                         /* Special case, linklocal to loop */
2380                         if (dest_is_loop)
2381                                 return (NULL);
2382                 }
2383         }
2384 #endif
2385         /*
2386          * Now that we know what is what, implement our table. This could in
2387          * theory be done slicker (it used to be), but this is
2388          * straightforward and easier to validate :-)
2389          */
2390         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2391             ifa->src_is_loop,
2392             dest_is_priv);
2393         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2394                 return (NULL);
2395         }
2396         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2397             ifa->src_is_loop,
2398             dest_is_global);
2399         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2400                 return (NULL);
2401         }
2402         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2403         /* its an acceptable address */
2404         return (ifa);
2405 }
2406
2407 int
2408 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2409 {
2410         struct sctp_laddr *laddr;
2411
2412         if (stcb == NULL) {
2413                 /* There are no restrictions, no TCB :-) */
2414                 return (0);
2415         }
2416         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2417                 if (laddr->ifa == NULL) {
2418                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2419                             __func__);
2420                         continue;
2421                 }
2422                 if (laddr->ifa == ifa) {
2423                         /* Yes it is on the list */
2424                         return (1);
2425                 }
2426         }
2427         return (0);
2428 }
2429
2430
2431 int
2432 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2433 {
2434         struct sctp_laddr *laddr;
2435
2436         if (ifa == NULL)
2437                 return (0);
2438         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2439                 if (laddr->ifa == NULL) {
2440                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2441                             __func__);
2442                         continue;
2443                 }
2444                 if ((laddr->ifa == ifa) && laddr->action == 0)
2445                         /* same pointer */
2446                         return (1);
2447         }
2448         return (0);
2449 }
2450
2451
2452
2453 static struct sctp_ifa *
2454 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2455     sctp_route_t *ro,
2456     uint32_t vrf_id,
2457     int non_asoc_addr_ok,
2458     uint8_t dest_is_priv,
2459     uint8_t dest_is_loop,
2460     sa_family_t fam)
2461 {
2462         struct sctp_laddr *laddr, *starting_point;
2463         void *ifn;
2464         int resettotop = 0;
2465         struct sctp_ifn *sctp_ifn;
2466         struct sctp_ifa *sctp_ifa, *sifa;
2467         struct sctp_vrf *vrf;
2468         uint32_t ifn_index;
2469
2470         vrf = sctp_find_vrf(vrf_id);
2471         if (vrf == NULL)
2472                 return (NULL);
2473
2474         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2475         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2476         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2477         /*
2478          * first question, is the ifn we will emit on in our list, if so, we
2479          * want such an address. Note that we first looked for a preferred
2480          * address.
2481          */
2482         if (sctp_ifn) {
2483                 /* is a preferred one on the interface we route out? */
2484                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2485 #ifdef INET
2486                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2487                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2488                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2489                                 continue;
2490                         }
2491 #endif
2492 #ifdef INET6
2493                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2494                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2495                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2496                                 continue;
2497                         }
2498 #endif
2499                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2500                             (non_asoc_addr_ok == 0))
2501                                 continue;
2502                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2503                             dest_is_loop,
2504                             dest_is_priv, fam);
2505                         if (sifa == NULL)
2506                                 continue;
2507                         if (sctp_is_addr_in_ep(inp, sifa)) {
2508                                 atomic_add_int(&sifa->refcount, 1);
2509                                 return (sifa);
2510                         }
2511                 }
2512         }
2513         /*
2514          * ok, now we now need to find one on the list of the addresses. We
2515          * can't get one on the emitting interface so let's find first a
2516          * preferred one. If not that an acceptable one otherwise... we
2517          * return NULL.
2518          */
2519         starting_point = inp->next_addr_touse;
2520 once_again:
2521         if (inp->next_addr_touse == NULL) {
2522                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2523                 resettotop = 1;
2524         }
2525         for (laddr = inp->next_addr_touse; laddr;
2526             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2527                 if (laddr->ifa == NULL) {
2528                         /* address has been removed */
2529                         continue;
2530                 }
2531                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2532                         /* address is being deleted */
2533                         continue;
2534                 }
2535                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2536                     dest_is_priv, fam);
2537                 if (sifa == NULL)
2538                         continue;
2539                 atomic_add_int(&sifa->refcount, 1);
2540                 return (sifa);
2541         }
2542         if (resettotop == 0) {
2543                 inp->next_addr_touse = NULL;
2544                 goto once_again;
2545         }
2546
2547         inp->next_addr_touse = starting_point;
2548         resettotop = 0;
2549 once_again_too:
2550         if (inp->next_addr_touse == NULL) {
2551                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552                 resettotop = 1;
2553         }
2554
2555         /* ok, what about an acceptable address in the inp */
2556         for (laddr = inp->next_addr_touse; laddr;
2557             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2558                 if (laddr->ifa == NULL) {
2559                         /* address has been removed */
2560                         continue;
2561                 }
2562                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2563                         /* address is being deleted */
2564                         continue;
2565                 }
2566                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2567                     dest_is_priv, fam);
2568                 if (sifa == NULL)
2569                         continue;
2570                 atomic_add_int(&sifa->refcount, 1);
2571                 return (sifa);
2572         }
2573         if (resettotop == 0) {
2574                 inp->next_addr_touse = NULL;
2575                 goto once_again_too;
2576         }
2577
2578         /*
2579          * no address bound can be a source for the destination we are in
2580          * trouble
2581          */
2582         return (NULL);
2583 }
2584
2585
2586
2587 static struct sctp_ifa *
2588 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2589     struct sctp_tcb *stcb,
2590     sctp_route_t *ro,
2591     uint32_t vrf_id,
2592     uint8_t dest_is_priv,
2593     uint8_t dest_is_loop,
2594     int non_asoc_addr_ok,
2595     sa_family_t fam)
2596 {
2597         struct sctp_laddr *laddr, *starting_point;
2598         void *ifn;
2599         struct sctp_ifn *sctp_ifn;
2600         struct sctp_ifa *sctp_ifa, *sifa;
2601         uint8_t start_at_beginning = 0;
2602         struct sctp_vrf *vrf;
2603         uint32_t ifn_index;
2604
2605         /*
2606          * first question, is the ifn we will emit on in our list, if so, we
2607          * want that one.
2608          */
2609         vrf = sctp_find_vrf(vrf_id);
2610         if (vrf == NULL)
2611                 return (NULL);
2612
2613         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2614         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2615         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2616
2617         /*
2618          * first question, is the ifn we will emit on in our list?  If so,
2619          * we want that one. First we look for a preferred. Second, we go
2620          * for an acceptable.
2621          */
2622         if (sctp_ifn) {
2623                 /* first try for a preferred address on the ep */
2624                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2625 #ifdef INET
2626                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2627                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2628                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2629                                 continue;
2630                         }
2631 #endif
2632 #ifdef INET6
2633                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2634                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2635                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2636                                 continue;
2637                         }
2638 #endif
2639                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2640                                 continue;
2641                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2642                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2643                                 if (sifa == NULL)
2644                                         continue;
2645                                 if (((non_asoc_addr_ok == 0) &&
2646                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2647                                     (non_asoc_addr_ok &&
2648                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2649                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2650                                         /* on the no-no list */
2651                                         continue;
2652                                 }
2653                                 atomic_add_int(&sifa->refcount, 1);
2654                                 return (sifa);
2655                         }
2656                 }
2657                 /* next try for an acceptable address on the ep */
2658                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2659 #ifdef INET
2660                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2661                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2662                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2663                                 continue;
2664                         }
2665 #endif
2666 #ifdef INET6
2667                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2668                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2669                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2670                                 continue;
2671                         }
2672 #endif
2673                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2674                                 continue;
2675                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2676                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2677                                 if (sifa == NULL)
2678                                         continue;
2679                                 if (((non_asoc_addr_ok == 0) &&
2680                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2681                                     (non_asoc_addr_ok &&
2682                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2683                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2684                                         /* on the no-no list */
2685                                         continue;
2686                                 }
2687                                 atomic_add_int(&sifa->refcount, 1);
2688                                 return (sifa);
2689                         }
2690                 }
2691
2692         }
2693         /*
2694          * if we can't find one like that then we must look at all addresses
2695          * bound to pick one at first preferable then secondly acceptable.
2696          */
2697         starting_point = stcb->asoc.last_used_address;
2698 sctp_from_the_top:
2699         if (stcb->asoc.last_used_address == NULL) {
2700                 start_at_beginning = 1;
2701                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2702         }
2703         /* search beginning with the last used address */
2704         for (laddr = stcb->asoc.last_used_address; laddr;
2705             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2706                 if (laddr->ifa == NULL) {
2707                         /* address has been removed */
2708                         continue;
2709                 }
2710                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2711                         /* address is being deleted */
2712                         continue;
2713                 }
2714                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2715                 if (sifa == NULL)
2716                         continue;
2717                 if (((non_asoc_addr_ok == 0) &&
2718                     (sctp_is_addr_restricted(stcb, sifa))) ||
2719                     (non_asoc_addr_ok &&
2720                     (sctp_is_addr_restricted(stcb, sifa)) &&
2721                     (!sctp_is_addr_pending(stcb, sifa)))) {
2722                         /* on the no-no list */
2723                         continue;
2724                 }
2725                 stcb->asoc.last_used_address = laddr;
2726                 atomic_add_int(&sifa->refcount, 1);
2727                 return (sifa);
2728         }
2729         if (start_at_beginning == 0) {
2730                 stcb->asoc.last_used_address = NULL;
2731                 goto sctp_from_the_top;
2732         }
2733         /* now try for any higher scope than the destination */
2734         stcb->asoc.last_used_address = starting_point;
2735         start_at_beginning = 0;
2736 sctp_from_the_top2:
2737         if (stcb->asoc.last_used_address == NULL) {
2738                 start_at_beginning = 1;
2739                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2740         }
2741         /* search beginning with the last used address */
2742         for (laddr = stcb->asoc.last_used_address; laddr;
2743             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2744                 if (laddr->ifa == NULL) {
2745                         /* address has been removed */
2746                         continue;
2747                 }
2748                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2749                         /* address is being deleted */
2750                         continue;
2751                 }
2752                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2753                     dest_is_priv, fam);
2754                 if (sifa == NULL)
2755                         continue;
2756                 if (((non_asoc_addr_ok == 0) &&
2757                     (sctp_is_addr_restricted(stcb, sifa))) ||
2758                     (non_asoc_addr_ok &&
2759                     (sctp_is_addr_restricted(stcb, sifa)) &&
2760                     (!sctp_is_addr_pending(stcb, sifa)))) {
2761                         /* on the no-no list */
2762                         continue;
2763                 }
2764                 stcb->asoc.last_used_address = laddr;
2765                 atomic_add_int(&sifa->refcount, 1);
2766                 return (sifa);
2767         }
2768         if (start_at_beginning == 0) {
2769                 stcb->asoc.last_used_address = NULL;
2770                 goto sctp_from_the_top2;
2771         }
2772         return (NULL);
2773 }
2774
2775 static struct sctp_ifa *
2776 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2777     struct sctp_inpcb *inp,
2778     struct sctp_tcb *stcb,
2779     int non_asoc_addr_ok,
2780     uint8_t dest_is_loop,
2781     uint8_t dest_is_priv,
2782     int addr_wanted,
2783     sa_family_t fam,
2784     sctp_route_t *ro
2785 )
2786 {
2787         struct sctp_ifa *ifa, *sifa;
2788         int num_eligible_addr = 0;
2789 #ifdef INET6
2790         struct sockaddr_in6 sin6, lsa6;
2791
2792         if (fam == AF_INET6) {
2793                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2794                 (void)sa6_recoverscope(&sin6);
2795         }
2796 #endif                          /* INET6 */
2797         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2798 #ifdef INET
2799                 if ((ifa->address.sa.sa_family == AF_INET) &&
2800                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2801                     &ifa->address.sin.sin_addr) != 0)) {
2802                         continue;
2803                 }
2804 #endif
2805 #ifdef INET6
2806                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2807                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2808                     &ifa->address.sin6.sin6_addr) != 0)) {
2809                         continue;
2810                 }
2811 #endif
2812                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2813                     (non_asoc_addr_ok == 0))
2814                         continue;
2815                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2816                     dest_is_priv, fam);
2817                 if (sifa == NULL)
2818                         continue;
2819 #ifdef INET6
2820                 if (fam == AF_INET6 &&
2821                     dest_is_loop &&
2822                     sifa->src_is_loop && sifa->src_is_priv) {
2823                         /*
2824                          * don't allow fe80::1 to be a src on loop ::1, we
2825                          * don't list it to the peer so we will get an
2826                          * abort.
2827                          */
2828                         continue;
2829                 }
2830                 if (fam == AF_INET6 &&
2831                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2832                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2833                         /*
2834                          * link-local <-> link-local must belong to the same
2835                          * scope.
2836                          */
2837                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2838                         (void)sa6_recoverscope(&lsa6);
2839                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2840                                 continue;
2841                         }
2842                 }
2843 #endif                          /* INET6 */
2844
2845                 /*
2846                  * Check if the IPv6 address matches to next-hop. In the
2847                  * mobile case, old IPv6 address may be not deleted from the
2848                  * interface. Then, the interface has previous and new
2849                  * addresses.  We should use one corresponding to the
2850                  * next-hop.  (by micchie)
2851                  */
2852 #ifdef INET6
2853                 if (stcb && fam == AF_INET6 &&
2854                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2855                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2856                             == 0) {
2857                                 continue;
2858                         }
2859                 }
2860 #endif
2861 #ifdef INET
2862                 /* Avoid topologically incorrect IPv4 address */
2863                 if (stcb && fam == AF_INET &&
2864                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2865                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2866                                 continue;
2867                         }
2868                 }
2869 #endif
2870                 if (stcb) {
2871                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2872                                 continue;
2873                         }
2874                         if (((non_asoc_addr_ok == 0) &&
2875                             (sctp_is_addr_restricted(stcb, sifa))) ||
2876                             (non_asoc_addr_ok &&
2877                             (sctp_is_addr_restricted(stcb, sifa)) &&
2878                             (!sctp_is_addr_pending(stcb, sifa)))) {
2879                                 /*
2880                                  * It is restricted for some reason..
2881                                  * probably not yet added.
2882                                  */
2883                                 continue;
2884                         }
2885                 }
2886                 if (num_eligible_addr >= addr_wanted) {
2887                         return (sifa);
2888                 }
2889                 num_eligible_addr++;
2890         }
2891         return (NULL);
2892 }
2893
2894
2895 static int
2896 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2897     struct sctp_inpcb *inp,
2898     struct sctp_tcb *stcb,
2899     int non_asoc_addr_ok,
2900     uint8_t dest_is_loop,
2901     uint8_t dest_is_priv,
2902     sa_family_t fam)
2903 {
2904         struct sctp_ifa *ifa, *sifa;
2905         int num_eligible_addr = 0;
2906
2907         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2908 #ifdef INET
2909                 if ((ifa->address.sa.sa_family == AF_INET) &&
2910                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2911                     &ifa->address.sin.sin_addr) != 0)) {
2912                         continue;
2913                 }
2914 #endif
2915 #ifdef INET6
2916                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2917                     (stcb != NULL) &&
2918                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2919                     &ifa->address.sin6.sin6_addr) != 0)) {
2920                         continue;
2921                 }
2922 #endif
2923                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2924                     (non_asoc_addr_ok == 0)) {
2925                         continue;
2926                 }
2927                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2928                     dest_is_priv, fam);
2929                 if (sifa == NULL) {
2930                         continue;
2931                 }
2932                 if (stcb) {
2933                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2934                                 continue;
2935                         }
2936                         if (((non_asoc_addr_ok == 0) &&
2937                             (sctp_is_addr_restricted(stcb, sifa))) ||
2938                             (non_asoc_addr_ok &&
2939                             (sctp_is_addr_restricted(stcb, sifa)) &&
2940                             (!sctp_is_addr_pending(stcb, sifa)))) {
2941                                 /*
2942                                  * It is restricted for some reason..
2943                                  * probably not yet added.
2944                                  */
2945                                 continue;
2946                         }
2947                 }
2948                 num_eligible_addr++;
2949         }
2950         return (num_eligible_addr);
2951 }
2952
2953 static struct sctp_ifa *
2954 sctp_choose_boundall(struct sctp_inpcb *inp,
2955     struct sctp_tcb *stcb,
2956     struct sctp_nets *net,
2957     sctp_route_t *ro,
2958     uint32_t vrf_id,
2959     uint8_t dest_is_priv,
2960     uint8_t dest_is_loop,
2961     int non_asoc_addr_ok,
2962     sa_family_t fam)
2963 {
2964         int cur_addr_num = 0, num_preferred = 0;
2965         void *ifn;
2966         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2967         struct sctp_ifa *sctp_ifa, *sifa;
2968         uint32_t ifn_index;
2969         struct sctp_vrf *vrf;
2970 #ifdef INET
2971         int retried = 0;
2972 #endif
2973
2974         /*-
2975          * For boundall we can use any address in the association.
2976          * If non_asoc_addr_ok is set we can use any address (at least in
2977          * theory). So we look for preferred addresses first. If we find one,
2978          * we use it. Otherwise we next try to get an address on the
2979          * interface, which we should be able to do (unless non_asoc_addr_ok
2980          * is false and we are routed out that way). In these cases where we
2981          * can't use the address of the interface we go through all the
2982          * ifn's looking for an address we can use and fill that in. Punting
2983          * means we send back address 0, which will probably cause problems
2984          * actually since then IP will fill in the address of the route ifn,
2985          * which means we probably already rejected it.. i.e. here comes an
2986          * abort :-<.
2987          */
2988         vrf = sctp_find_vrf(vrf_id);
2989         if (vrf == NULL)
2990                 return (NULL);
2991
2992         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2993         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2994         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2995         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2996         if (sctp_ifn == NULL) {
2997                 /* ?? We don't have this guy ?? */
2998                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2999                 goto bound_all_plan_b;
3000         }
3001         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3002             ifn_index, sctp_ifn->ifn_name);
3003
3004         if (net) {
3005                 cur_addr_num = net->indx_of_eligible_next_to_use;
3006         }
3007         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3008             inp, stcb,
3009             non_asoc_addr_ok,
3010             dest_is_loop,
3011             dest_is_priv, fam);
3012         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3013             num_preferred, sctp_ifn->ifn_name);
3014         if (num_preferred == 0) {
3015                 /*
3016                  * no eligible addresses, we must use some other interface
3017                  * address if we can find one.
3018                  */
3019                 goto bound_all_plan_b;
3020         }
3021         /*
3022          * Ok we have num_eligible_addr set with how many we can use, this
3023          * may vary from call to call due to addresses being deprecated
3024          * etc..
3025          */
3026         if (cur_addr_num >= num_preferred) {
3027                 cur_addr_num = 0;
3028         }
3029         /*
3030          * select the nth address from the list (where cur_addr_num is the
3031          * nth) and 0 is the first one, 1 is the second one etc...
3032          */
3033         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3034
3035         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3036             dest_is_priv, cur_addr_num, fam, ro);
3037
3038         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3039         if (sctp_ifa) {
3040                 atomic_add_int(&sctp_ifa->refcount, 1);
3041                 if (net) {
3042                         /* save off where the next one we will want */
3043                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3044                 }
3045                 return (sctp_ifa);
3046         }
3047         /*
3048          * plan_b: Look at all interfaces and find a preferred address. If
3049          * no preferred fall through to plan_c.
3050          */
3051 bound_all_plan_b:
3052         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3053         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3054                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3055                     sctp_ifn->ifn_name);
3056                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3057                         /* wrong base scope */
3058                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3059                         continue;
3060                 }
3061                 if ((sctp_ifn == looked_at) && looked_at) {
3062                         /* already looked at this guy */
3063                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3064                         continue;
3065                 }
3066                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3067                     dest_is_loop, dest_is_priv, fam);
3068                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3069                     "Found ifn:%p %d preferred source addresses\n",
3070                     ifn, num_preferred);
3071                 if (num_preferred == 0) {
3072                         /* None on this interface. */
3073                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3074                         continue;
3075                 }
3076                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3077                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3078                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3079
3080                 /*
3081                  * Ok we have num_eligible_addr set with how many we can
3082                  * use, this may vary from call to call due to addresses
3083                  * being deprecated etc..
3084                  */
3085                 if (cur_addr_num >= num_preferred) {
3086                         cur_addr_num = 0;
3087                 }
3088                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3089                     dest_is_priv, cur_addr_num, fam, ro);
3090                 if (sifa == NULL)
3091                         continue;
3092                 if (net) {
3093                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3094                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3095                             cur_addr_num);
3096                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3097                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3098                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3099                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3100                 }
3101                 atomic_add_int(&sifa->refcount, 1);
3102                 return (sifa);
3103         }
3104 #ifdef INET
3105 again_with_private_addresses_allowed:
3106 #endif
3107         /* plan_c: do we have an acceptable address on the emit interface */
3108         sifa = NULL;
3109         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3110         if (emit_ifn == NULL) {
3111                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3112                 goto plan_d;
3113         }
3114         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3115                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3116 #ifdef INET
3117                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3118                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3119                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3120                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3121                         continue;
3122                 }
3123 #endif
3124 #ifdef INET6
3125                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3126                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3127                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3128                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3129                         continue;
3130                 }
3131 #endif
3132                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3133                     (non_asoc_addr_ok == 0)) {
3134                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3135                         continue;
3136                 }
3137                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3138                     dest_is_priv, fam);
3139                 if (sifa == NULL) {
3140                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3141                         continue;
3142                 }
3143                 if (stcb) {
3144                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3145                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3146                                 sifa = NULL;
3147                                 continue;
3148                         }
3149                         if (((non_asoc_addr_ok == 0) &&
3150                             (sctp_is_addr_restricted(stcb, sifa))) ||
3151                             (non_asoc_addr_ok &&
3152                             (sctp_is_addr_restricted(stcb, sifa)) &&
3153                             (!sctp_is_addr_pending(stcb, sifa)))) {
3154                                 /*
3155                                  * It is restricted for some reason..
3156                                  * probably not yet added.
3157                                  */
3158                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3159                                 sifa = NULL;
3160                                 continue;
3161                         }
3162                 }
3163                 atomic_add_int(&sifa->refcount, 1);
3164                 goto out;
3165         }
3166 plan_d:
3167         /*
3168          * plan_d: We are in trouble. No preferred address on the emit
3169          * interface. And not even a preferred address on all interfaces. Go
3170          * out and see if we can find an acceptable address somewhere
3171          * amongst all interfaces.
3172          */
3173         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3174         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3175                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3176                         /* wrong base scope */
3177                         continue;
3178                 }
3179                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3180 #ifdef INET
3181                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3182                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3183                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3184                                 continue;
3185                         }
3186 #endif
3187 #ifdef INET6
3188                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3189                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3190                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3191                                 continue;
3192                         }
3193 #endif
3194                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3195                             (non_asoc_addr_ok == 0))
3196                                 continue;
3197                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3198                             dest_is_loop,
3199                             dest_is_priv, fam);
3200                         if (sifa == NULL)
3201                                 continue;
3202                         if (stcb) {
3203                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3204                                         sifa = NULL;
3205                                         continue;
3206                                 }
3207                                 if (((non_asoc_addr_ok == 0) &&
3208                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3209                                     (non_asoc_addr_ok &&
3210                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3211                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3212                                         /*
3213                                          * It is restricted for some
3214                                          * reason.. probably not yet added.
3215                                          */
3216                                         sifa = NULL;
3217                                         continue;
3218                                 }
3219                         }
3220                         goto out;
3221                 }
3222         }
3223 #ifdef INET
3224         if (stcb) {
3225                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3226                         stcb->asoc.scope.ipv4_local_scope = 1;
3227                         retried = 1;
3228                         goto again_with_private_addresses_allowed;
3229                 } else if (retried == 1) {
3230                         stcb->asoc.scope.ipv4_local_scope = 0;
3231                 }
3232         }
3233 #endif
3234 out:
3235 #ifdef INET
3236         if (sifa) {
3237                 if (retried == 1) {
3238                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3239                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3240                                         /* wrong base scope */
3241                                         continue;
3242                                 }
3243                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3244                                         struct sctp_ifa *tmp_sifa;
3245
3246 #ifdef INET
3247                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3248                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3249                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3250                                                 continue;
3251                                         }
3252 #endif
3253 #ifdef INET6
3254                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3255                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3256                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3257                                                 continue;
3258                                         }
3259 #endif
3260                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3261                                             (non_asoc_addr_ok == 0))
3262                                                 continue;
3263                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3264                                             dest_is_loop,
3265                                             dest_is_priv, fam);
3266                                         if (tmp_sifa == NULL) {
3267                                                 continue;
3268                                         }
3269                                         if (tmp_sifa == sifa) {
3270                                                 continue;
3271                                         }
3272                                         if (stcb) {
3273                                                 if (sctp_is_address_in_scope(tmp_sifa,
3274                                                     &stcb->asoc.scope, 0) == 0) {
3275                                                         continue;
3276                                                 }
3277                                                 if (((non_asoc_addr_ok == 0) &&
3278                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3279                                                     (non_asoc_addr_ok &&
3280                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3281                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3282                                                         /*
3283                                                          * It is restricted
3284                                                          * for some reason..
3285                                                          * probably not yet
3286                                                          * added.
3287                                                          */
3288                                                         continue;
3289                                                 }
3290                                         }
3291                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3292                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3293                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3294                                         }
3295                                 }
3296                         }
3297                 }
3298                 atomic_add_int(&sifa->refcount, 1);
3299         }
3300 #endif
3301         return (sifa);
3302 }
3303
3304
3305
3306 /* tcb may be NULL */
3307 struct sctp_ifa *
3308 sctp_source_address_selection(struct sctp_inpcb *inp,
3309     struct sctp_tcb *stcb,
3310     sctp_route_t *ro,
3311     struct sctp_nets *net,
3312     int non_asoc_addr_ok, uint32_t vrf_id)
3313 {
3314         struct sctp_ifa *answer;
3315         uint8_t dest_is_priv, dest_is_loop;
3316         sa_family_t fam;
3317 #ifdef INET
3318         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3319 #endif
3320 #ifdef INET6
3321         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3322 #endif
3323
3324         /**
3325          * Rules:
3326          * - Find the route if needed, cache if I can.
3327          * - Look at interface address in route, Is it in the bound list. If so we
3328          *   have the best source.
3329          * - If not we must rotate amongst the addresses.
3330          *
3331          * Cavets and issues
3332          *
3333          * Do we need to pay attention to scope. We can have a private address
3334          * or a global address we are sourcing or sending to. So if we draw
3335          * it out
3336          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3337          * For V4
3338          * ------------------------------------------
3339          *      source     *      dest  *  result
3340          * -----------------------------------------
3341          * <a>  Private    *    Global  *  NAT
3342          * -----------------------------------------
3343          * <b>  Private    *    Private *  No problem
3344          * -----------------------------------------
3345          * <c>  Global     *    Private *  Huh, How will this work?
3346          * -----------------------------------------
3347          * <d>  Global     *    Global  *  No Problem
3348          *------------------------------------------
3349          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3350          * For V6
3351          *------------------------------------------
3352          *      source     *      dest  *  result
3353          * -----------------------------------------
3354          * <a>  Linklocal  *    Global  *
3355          * -----------------------------------------
3356          * <b>  Linklocal  * Linklocal  *  No problem
3357          * -----------------------------------------
3358          * <c>  Global     * Linklocal  *  Huh, How will this work?
3359          * -----------------------------------------
3360          * <d>  Global     *    Global  *  No Problem
3361          *------------------------------------------
3362          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3363          *
3364          * And then we add to that what happens if there are multiple addresses
3365          * assigned to an interface. Remember the ifa on a ifn is a linked
3366          * list of addresses. So one interface can have more than one IP
3367          * address. What happens if we have both a private and a global
3368          * address? Do we then use context of destination to sort out which
3369          * one is best? And what about NAT's sending P->G may get you a NAT
3370          * translation, or should you select the G thats on the interface in
3371          * preference.
3372          *
3373          * Decisions:
3374          *
3375          * - count the number of addresses on the interface.
3376          * - if it is one, no problem except case <c>.
3377          *   For <a> we will assume a NAT out there.
3378          * - if there are more than one, then we need to worry about scope P
3379          *   or G. We should prefer G -> G and P -> P if possible.
3380          *   Then as a secondary fall back to mixed types G->P being a last
3381          *   ditch one.
3382          * - The above all works for bound all, but bound specific we need to
3383          *   use the same concept but instead only consider the bound
3384          *   addresses. If the bound set is NOT assigned to the interface then
3385          *   we must use rotation amongst the bound addresses..
3386          */
3387         if (ro->ro_rt == NULL) {
3388                 /*
3389                  * Need a route to cache.
3390                  */
3391                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3392         }
3393         if (ro->ro_rt == NULL) {
3394                 return (NULL);
3395         }
3396         fam = ro->ro_dst.sa_family;
3397         dest_is_priv = dest_is_loop = 0;
3398         /* Setup our scopes for the destination */
3399         switch (fam) {
3400 #ifdef INET
3401         case AF_INET:
3402                 /* Scope based on outbound address */
3403                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3404                         dest_is_loop = 1;
3405                         if (net != NULL) {
3406                                 /* mark it as local */
3407                                 net->addr_is_local = 1;
3408                         }
3409                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3410                         dest_is_priv = 1;
3411                 }
3412                 break;
3413 #endif
3414 #ifdef INET6
3415         case AF_INET6:
3416                 /* Scope based on outbound address */
3417                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3418                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3419                         /*
3420                          * If the address is a loopback address, which
3421                          * consists of "::1" OR "fe80::1%lo0", we are
3422                          * loopback scope. But we don't use dest_is_priv
3423                          * (link local addresses).
3424                          */
3425                         dest_is_loop = 1;
3426                         if (net != NULL) {
3427                                 /* mark it as local */
3428                                 net->addr_is_local = 1;
3429                         }
3430                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3431                         dest_is_priv = 1;
3432                 }
3433                 break;
3434 #endif
3435         }
3436         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3437         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3438         SCTP_IPI_ADDR_RLOCK();
3439         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3440                 /*
3441                  * Bound all case
3442                  */
3443                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3444                     dest_is_priv, dest_is_loop,
3445                     non_asoc_addr_ok, fam);
3446                 SCTP_IPI_ADDR_RUNLOCK();
3447                 return (answer);
3448         }
3449         /*
3450          * Subset bound case
3451          */
3452         if (stcb) {
3453                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3454                     vrf_id, dest_is_priv,
3455                     dest_is_loop,
3456                     non_asoc_addr_ok, fam);
3457         } else {
3458                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3459                     non_asoc_addr_ok,
3460                     dest_is_priv,
3461                     dest_is_loop, fam);
3462         }
3463         SCTP_IPI_ADDR_RUNLOCK();
3464         return (answer);
3465 }
3466
3467 static int
3468 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3469 {
3470         struct cmsghdr cmh;
3471         struct sctp_sndinfo sndinfo;
3472         struct sctp_prinfo prinfo;
3473         struct sctp_authinfo authinfo;
3474         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3475         int found;
3476
3477         /*
3478          * Independent of how many mbufs, find the c_type inside the control
3479          * structure and copy out the data.
3480          */
3481         found = 0;
3482         tot_len = SCTP_BUF_LEN(control);
3483         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3484                 rem_len = tot_len - off;
3485                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3486                         /* There is not enough room for one more. */
3487                         return (found);
3488                 }
3489                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3490                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3491                         /* We dont't have a complete CMSG header. */
3492                         return (found);
3493                 }
3494                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3495                         /* We don't have the complete CMSG. */
3496                         return (found);
3497                 }
3498                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3499                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3500                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3501                     ((c_type == cmh.cmsg_type) ||
3502                     ((c_type == SCTP_SNDRCV) &&
3503                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3504                     (cmh.cmsg_type == SCTP_PRINFO) ||
3505                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3506                         if (c_type == cmh.cmsg_type) {
3507                                 if (cpsize > INT_MAX) {
3508                                         return (found);
3509                                 }
3510                                 if (cmsg_data_len < (int)cpsize) {
3511                                         return (found);
3512                                 }
3513                                 /* It is exactly what we want. Copy it out. */
3514                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3515                                 return (1);
3516                         } else {
3517                                 struct sctp_sndrcvinfo *sndrcvinfo;
3518
3519                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3520                                 if (found == 0) {
3521                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3522                                                 return (found);
3523                                         }
3524                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3525                                 }
3526                                 switch (cmh.cmsg_type) {
3527                                 case SCTP_SNDINFO:
3528                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3529                                                 return (found);
3530                                         }
3531                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3532                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3533                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3534                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3535                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3536                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3537                                         break;
3538                                 case SCTP_PRINFO:
3539                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3540                                                 return (found);
3541                                         }
3542                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3543                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3544                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3545                                         } else {
3546                                                 sndrcvinfo->sinfo_timetolive = 0;
3547                                         }
3548                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3549                                         break;
3550                                 case SCTP_AUTHINFO:
3551                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3552                                                 return (found);
3553                                         }
3554                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3555                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3556                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3557                                         break;
3558                                 default:
3559                                         return (found);
3560                                 }
3561                                 found = 1;
3562                         }
3563                 }
3564         }
3565         return (found);
3566 }
3567
3568 static int
3569 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3570 {
3571         struct cmsghdr cmh;
3572         int tlen, at;
3573         struct sctp_initmsg initmsg;
3574 #ifdef INET
3575         struct sockaddr_in sin;
3576 #endif
3577 #ifdef INET6
3578         struct sockaddr_in6 sin6;
3579 #endif
3580
3581         tlen = SCTP_BUF_LEN(control);
3582         at = 0;
3583         while (at < tlen) {
3584                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3585                         /* There is not enough room for one more. */
3586                         *error = EINVAL;
3587                         return (1);
3588                 }
3589                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3590                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3591                         /* We dont't have a complete CMSG header. */
3592                         *error = EINVAL;
3593                         return (1);
3594                 }
3595                 if (((int)cmh.cmsg_len + at) > tlen) {
3596                         /* We don't have the complete CMSG. */
3597                         *error = EINVAL;
3598                         return (1);
3599                 }
3600                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3601                         switch (cmh.cmsg_type) {
3602                         case SCTP_INIT:
3603                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3604                                         *error = EINVAL;
3605                                         return (1);
3606                                 }
3607                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3608                                 if (initmsg.sinit_max_attempts)
3609                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3610                                 if (initmsg.sinit_num_ostreams)
3611                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3612                                 if (initmsg.sinit_max_instreams)
3613                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3614                                 if (initmsg.sinit_max_init_timeo)
3615                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3616                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3617                                         struct sctp_stream_out *tmp_str;
3618                                         unsigned int i;
3619 #if defined(SCTP_DETAILED_STR_STATS)
3620                                         int j;
3621 #endif
3622
3623                                         /* Default is NOT correct */
3624                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3625                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3626                                         SCTP_TCB_UNLOCK(stcb);
3627                                         SCTP_MALLOC(tmp_str,
3628                                             struct sctp_stream_out *,
3629                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3630                                             SCTP_M_STRMO);
3631                                         SCTP_TCB_LOCK(stcb);
3632                                         if (tmp_str != NULL) {
3633                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3634                                                 stcb->asoc.strmout = tmp_str;
3635                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3636                                         } else {
3637                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3638                                         }
3639                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3640                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3641                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3642                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3643                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3644 #if defined(SCTP_DETAILED_STR_STATS)
3645                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3646                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3647                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3648                                                 }
3649 #else
3650                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3651                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3652 #endif
3653                                                 stcb->asoc.strmout[i].sid = i;
3654                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3655                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3656                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3657                                         }
3658                                 }
3659                                 break;
3660 #ifdef INET
3661                         case SCTP_DSTADDRV4:
3662                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3663                                         *error = EINVAL;
3664                                         return (1);
3665                                 }
3666                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3667                                 sin.sin_family = AF_INET;
3668                                 sin.sin_len = sizeof(struct sockaddr_in);
3669                                 sin.sin_port = stcb->rport;
3670                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3671                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3672                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3673                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3674                                         *error = EINVAL;
3675                                         return (1);
3676                                 }
3677                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3678                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3679                                         *error = ENOBUFS;
3680                                         return (1);
3681                                 }
3682                                 break;
3683 #endif
3684 #ifdef INET6
3685                         case SCTP_DSTADDRV6:
3686                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3687                                         *error = EINVAL;
3688                                         return (1);
3689                                 }
3690                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3691                                 sin6.sin6_family = AF_INET6;
3692                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3693                                 sin6.sin6_port = stcb->rport;
3694                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3695                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3696                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3697                                         *error = EINVAL;
3698                                         return (1);
3699                                 }
3700 #ifdef INET
3701                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3702                                         in6_sin6_2_sin(&sin, &sin6);
3703                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3704                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3705                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3706                                                 *error = EINVAL;
3707                                                 return (1);
3708                                         }
3709                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3710                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3711                                                 *error = ENOBUFS;
3712                                                 return (1);
3713                                         }
3714                                 } else
3715 #endif
3716                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3717                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3718                                         *error = ENOBUFS;
3719                                         return (1);
3720                                 }
3721                                 break;
3722 #endif
3723                         default:
3724                                 break;
3725                         }
3726                 }
3727                 at += CMSG_ALIGN(cmh.cmsg_len);
3728         }
3729         return (0);
3730 }
3731
3732 static struct sctp_tcb *
3733 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3734     uint16_t port,
3735     struct mbuf *control,
3736     struct sctp_nets **net_p,
3737     int *error)
3738 {
3739         struct cmsghdr cmh;
3740         int tlen, at;
3741         struct sctp_tcb *stcb;
3742         struct sockaddr *addr;
3743 #ifdef INET
3744         struct sockaddr_in sin;
3745 #endif
3746 #ifdef INET6
3747         struct sockaddr_in6 sin6;
3748 #endif
3749
3750         tlen = SCTP_BUF_LEN(control);
3751         at = 0;
3752         while (at < tlen) {
3753                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3754                         /* There is not enough room for one more. */
3755                         *error = EINVAL;
3756                         return (NULL);
3757                 }
3758                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3759                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3760                         /* We dont't have a complete CMSG header. */
3761                         *error = EINVAL;
3762                         return (NULL);
3763                 }
3764                 if (((int)cmh.cmsg_len + at) > tlen) {
3765                         /* We don't have the complete CMSG. */
3766                         *error = EINVAL;
3767                         return (NULL);
3768                 }
3769                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3770                         switch (cmh.cmsg_type) {
3771 #ifdef INET
3772                         case SCTP_DSTADDRV4:
3773                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3774                                         *error = EINVAL;
3775                                         return (NULL);
3776                                 }
3777                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3778                                 sin.sin_family = AF_INET;
3779                                 sin.sin_len = sizeof(struct sockaddr_in);
3780                                 sin.sin_port = port;
3781                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3782                                 addr = (struct sockaddr *)&sin;
3783                                 break;
3784 #endif
3785 #ifdef INET6
3786                         case SCTP_DSTADDRV6:
3787                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3788                                         *error = EINVAL;
3789                                         return (NULL);
3790                                 }
3791                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3792                                 sin6.sin6_family = AF_INET6;
3793                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3794                                 sin6.sin6_port = port;
3795                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3796 #ifdef INET
3797                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3798                                         in6_sin6_2_sin(&sin, &sin6);
3799                                         addr = (struct sockaddr *)&sin;
3800                                 } else
3801 #endif
3802                                         addr = (struct sockaddr *)&sin6;
3803                                 break;
3804 #endif
3805                         default:
3806                                 addr = NULL;
3807                                 break;
3808                         }
3809                         if (addr) {
3810                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3811                                 if (stcb != NULL) {
3812                                         return (stcb);
3813                                 }
3814                         }
3815                 }
3816                 at += CMSG_ALIGN(cmh.cmsg_len);
3817         }
3818         return (NULL);
3819 }
3820
3821 static struct mbuf *
3822 sctp_add_cookie(struct mbuf *init, int init_offset,
3823     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3824 {
3825         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3826         struct sctp_state_cookie *stc;
3827         struct sctp_paramhdr *ph;
3828         uint8_t *foo;
3829         int sig_offset;
3830         uint16_t cookie_sz;
3831
3832         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3833             sizeof(struct sctp_paramhdr)), 0,
3834             M_NOWAIT, 1, MT_DATA);
3835         if (mret == NULL) {
3836                 return (NULL);
3837         }
3838         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3839         if (copy_init == NULL) {
3840                 sctp_m_freem(mret);
3841                 return (NULL);
3842         }
3843 #ifdef SCTP_MBUF_LOGGING
3844         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3845                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3846         }
3847 #endif
3848         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3849             M_NOWAIT);
3850         if (copy_initack == NULL) {
3851                 sctp_m_freem(mret);
3852                 sctp_m_freem(copy_init);
3853                 return (NULL);
3854         }
3855 #ifdef SCTP_MBUF_LOGGING
3856         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3857                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3858         }
3859 #endif
3860         /* easy side we just drop it on the end */
3861         ph = mtod(mret, struct sctp_paramhdr *);
3862         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3863             sizeof(struct sctp_paramhdr);
3864         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3865             sizeof(struct sctp_paramhdr));
3866         ph->param_type = htons(SCTP_STATE_COOKIE);
3867         ph->param_length = 0;   /* fill in at the end */
3868         /* Fill in the stc cookie data */
3869         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3870
3871         /* tack the INIT and then the INIT-ACK onto the chain */
3872         cookie_sz = 0;
3873         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3874                 cookie_sz += SCTP_BUF_LEN(m_at);
3875                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3876                         SCTP_BUF_NEXT(m_at) = copy_init;
3877                         break;
3878                 }
3879         }
3880         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3881                 cookie_sz += SCTP_BUF_LEN(m_at);
3882                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3883                         SCTP_BUF_NEXT(m_at) = copy_initack;
3884                         break;
3885                 }
3886         }
3887         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3888                 cookie_sz += SCTP_BUF_LEN(m_at);
3889                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3890                         break;
3891                 }
3892         }
3893         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3894         if (sig == NULL) {
3895                 /* no space, so free the entire chain */
3896                 sctp_m_freem(mret);
3897                 return (NULL);
3898         }
3899         SCTP_BUF_LEN(sig) = 0;
3900         SCTP_BUF_NEXT(m_at) = sig;
3901         sig_offset = 0;
3902         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3903         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3904         *signature = foo;
3905         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3906         cookie_sz += SCTP_SIGNATURE_SIZE;
3907         ph->param_length = htons(cookie_sz);
3908         return (mret);
3909 }
3910
3911
3912 static uint8_t
3913 sctp_get_ect(struct sctp_tcb *stcb)
3914 {
3915         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3916                 return (SCTP_ECT0_BIT);
3917         } else {
3918                 return (0);
3919         }
3920 }
3921
3922 #if defined(INET) || defined(INET6)
3923 static void
3924 sctp_handle_no_route(struct sctp_tcb *stcb,
3925     struct sctp_nets *net,
3926     int so_locked)
3927 {
3928         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3929
3930         if (net) {
3931                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3932                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3933                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3934                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3935                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3936                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3937                                     stcb, 0,
3938                                     (void *)net,
3939                                     so_locked);
3940                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3941                                 net->dest_state &= ~SCTP_ADDR_PF;
3942                         }
3943                 }
3944                 if (stcb) {
3945                         if (net == stcb->asoc.primary_destination) {
3946                                 /* need a new primary */
3947                                 struct sctp_nets *alt;
3948
3949                                 alt = sctp_find_alternate_net(stcb, net, 0);
3950                                 if (alt != net) {
3951                                         if (stcb->asoc.alternate) {
3952                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3953                                         }
3954                                         stcb->asoc.alternate = alt;
3955                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3956                                         if (net->ro._s_addr) {
3957                                                 sctp_free_ifa(net->ro._s_addr);
3958                                                 net->ro._s_addr = NULL;
3959                                         }
3960                                         net->src_addr_selected = 0;
3961                                 }
3962                         }
3963                 }
3964         }
3965 }
3966 #endif
3967
3968 static int
3969 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3970     struct sctp_tcb *stcb,      /* may be NULL */
3971     struct sctp_nets *net,
3972     struct sockaddr *to,
3973     struct mbuf *m,
3974     uint32_t auth_offset,
3975     struct sctp_auth_chunk *auth,
3976     uint16_t auth_keyid,
3977     int nofragment_flag,
3978     int ecn_ok,
3979     int out_of_asoc_ok,
3980     uint16_t src_port,
3981     uint16_t dest_port,
3982     uint32_t v_tag,
3983     uint16_t port,
3984     union sctp_sockstore *over_addr,
3985     uint8_t mflowtype, uint32_t mflowid,
3986 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3987     int so_locked SCTP_UNUSED
3988 #else
3989     int so_locked
3990 #endif
3991 )
3992 {
3993 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3994         /**
3995          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3996          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3997          * - fill in the HMAC digest of any AUTH chunk in the packet.
3998          * - calculate and fill in the SCTP checksum.
3999          * - prepend an IP address header.
4000          * - if boundall use INADDR_ANY.
4001          * - if boundspecific do source address selection.
4002          * - set fragmentation option for ipV4.
4003          * - On return from IP output, check/adjust mtu size of output
4004          *   interface and smallest_mtu size as well.
4005          */
4006         /* Will need ifdefs around this */
4007         struct mbuf *newm;
4008         struct sctphdr *sctphdr;
4009         int packet_length;
4010         int ret;
4011 #if defined(INET) || defined(INET6)
4012         uint32_t vrf_id;
4013 #endif
4014 #if defined(INET) || defined(INET6)
4015         struct mbuf *o_pak;
4016         sctp_route_t *ro = NULL;
4017         struct udphdr *udp = NULL;
4018 #endif
4019         uint8_t tos_value;
4020 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4021         struct socket *so = NULL;
4022 #endif
4023
4024         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4025                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4026                 sctp_m_freem(m);
4027                 return (EFAULT);
4028         }
4029 #if defined(INET) || defined(INET6)
4030         if (stcb) {
4031                 vrf_id = stcb->asoc.vrf_id;
4032         } else {
4033                 vrf_id = inp->def_vrf_id;
4034         }
4035 #endif
4036         /* fill in the HMAC digest for any AUTH chunk in the packet */
4037         if ((auth != NULL) && (stcb != NULL)) {
4038                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4039         }
4040
4041         if (net) {
4042                 tos_value = net->dscp;
4043         } else if (stcb) {
4044                 tos_value = stcb->asoc.default_dscp;
4045         } else {
4046                 tos_value = inp->sctp_ep.default_dscp;
4047         }
4048
4049         switch (to->sa_family) {
4050 #ifdef INET
4051         case AF_INET:
4052                 {
4053                         struct ip *ip = NULL;
4054                         sctp_route_t iproute;
4055                         int len;
4056
4057                         len = SCTP_MIN_V4_OVERHEAD;
4058                         if (port) {
4059                                 len += sizeof(struct udphdr);
4060                         }
4061                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4062                         if (newm == NULL) {
4063                                 sctp_m_freem(m);
4064                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4065                                 return (ENOMEM);
4066                         }
4067                         SCTP_ALIGN_TO_END(newm, len);
4068                         SCTP_BUF_LEN(newm) = len;
4069                         SCTP_BUF_NEXT(newm) = m;
4070                         m = newm;
4071                         if (net != NULL) {
4072                                 m->m_pkthdr.flowid = net->flowid;
4073                                 M_HASHTYPE_SET(m, net->flowtype);
4074                         } else {
4075                                 m->m_pkthdr.flowid = mflowid;
4076                                 M_HASHTYPE_SET(m, mflowtype);
4077                         }
4078                         packet_length = sctp_calculate_len(m);
4079                         ip = mtod(m, struct ip *);
4080                         ip->ip_v = IPVERSION;
4081                         ip->ip_hl = (sizeof(struct ip) >> 2);
4082                         if (tos_value == 0) {
4083                                 /*
4084                                  * This means especially, that it is not set
4085                                  * at the SCTP layer. So use the value from
4086                                  * the IP layer.
4087                                  */
4088                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4089                         }
4090                         tos_value &= 0xfc;
4091                         if (ecn_ok) {
4092                                 tos_value |= sctp_get_ect(stcb);
4093                         }
4094                         if ((nofragment_flag) && (port == 0)) {
4095                                 ip->ip_off = htons(IP_DF);
4096                         } else {
4097                                 ip->ip_off = htons(0);
4098                         }
4099                         /* FreeBSD has a function for ip_id's */
4100                         ip_fillid(ip);
4101
4102                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4103                         ip->ip_len = htons(packet_length);
4104                         ip->ip_tos = tos_value;
4105                         if (port) {
4106                                 ip->ip_p = IPPROTO_UDP;
4107                         } else {
4108                                 ip->ip_p = IPPROTO_SCTP;
4109                         }
4110                         ip->ip_sum = 0;
4111                         if (net == NULL) {
4112                                 ro = &iproute;
4113                                 memset(&iproute, 0, sizeof(iproute));
4114                                 memcpy(&ro->ro_dst, to, to->sa_len);
4115                         } else {
4116                                 ro = (sctp_route_t *)&net->ro;
4117                         }
4118                         /* Now the address selection part */
4119                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4120
4121                         /* call the routine to select the src address */
4122                         if (net && out_of_asoc_ok == 0) {
4123                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4124                                         sctp_free_ifa(net->ro._s_addr);
4125                                         net->ro._s_addr = NULL;
4126                                         net->src_addr_selected = 0;
4127                                         if (ro->ro_rt) {
4128                                                 RTFREE(ro->ro_rt);
4129                                                 ro->ro_rt = NULL;
4130                                         }
4131                                 }
4132                                 if (net->src_addr_selected == 0) {
4133                                         /* Cache the source address */
4134                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4135                                             ro, net, 0,
4136                                             vrf_id);
4137                                         net->src_addr_selected = 1;
4138                                 }
4139                                 if (net->ro._s_addr == NULL) {
4140                                         /* No route to host */
4141                                         net->src_addr_selected = 0;
4142                                         sctp_handle_no_route(stcb, net, so_locked);
4143                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4144                                         sctp_m_freem(m);
4145                                         return (EHOSTUNREACH);
4146                                 }
4147                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4148                         } else {
4149                                 if (over_addr == NULL) {
4150                                         struct sctp_ifa *_lsrc;
4151
4152                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4153                                             net,
4154                                             out_of_asoc_ok,
4155                                             vrf_id);
4156                                         if (_lsrc == NULL) {
4157                                                 sctp_handle_no_route(stcb, net, so_locked);
4158                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4159                                                 sctp_m_freem(m);
4160                                                 return (EHOSTUNREACH);
4161                                         }
4162                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4163                                         sctp_free_ifa(_lsrc);
4164                                 } else {
4165                                         ip->ip_src = over_addr->sin.sin_addr;
4166                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4167                                 }
4168                         }
4169                         if (port) {
4170                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4171                                         sctp_handle_no_route(stcb, net, so_locked);
4172                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4173                                         sctp_m_freem(m);
4174                                         return (EHOSTUNREACH);
4175                                 }
4176                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4177                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4178                                 udp->uh_dport = port;
4179                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4180                                 if (V_udp_cksum) {
4181                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4182                                 } else {
4183                                         udp->uh_sum = 0;
4184                                 }
4185                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4186                         } else {
4187                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4188                         }
4189
4190                         sctphdr->src_port = src_port;
4191                         sctphdr->dest_port = dest_port;
4192                         sctphdr->v_tag = v_tag;
4193                         sctphdr->checksum = 0;
4194
4195                         /*
4196                          * If source address selection fails and we find no
4197                          * route then the ip_output should fail as well with
4198                          * a NO_ROUTE_TO_HOST type error. We probably should
4199                          * catch that somewhere and abort the association
4200                          * right away (assuming this is an INIT being sent).
4201                          */
4202                         if (ro->ro_rt == NULL) {
4203                                 /*
4204                                  * src addr selection failed to find a route
4205                                  * (or valid source addr), so we can't get
4206                                  * there from here (yet)!
4207                                  */
4208                                 sctp_handle_no_route(stcb, net, so_locked);
4209                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4210                                 sctp_m_freem(m);
4211                                 return (EHOSTUNREACH);
4212                         }
4213                         if (ro != &iproute) {
4214                                 memcpy(&iproute, ro, sizeof(*ro));
4215                         }
4216                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4217                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4218                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4219                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4220                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4221                             (void *)ro->ro_rt);
4222
4223                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4224                                 /* failed to prepend data, give up */
4225                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4226                                 sctp_m_freem(m);
4227                                 return (ENOMEM);
4228                         }
4229                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4230                         if (port) {
4231                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4232                                 SCTP_STAT_INCR(sctps_sendswcrc);
4233                                 if (V_udp_cksum) {
4234                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4235                                 }
4236                         } else {
4237                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4238                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4239                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4240                         }
4241 #ifdef SCTP_PACKET_LOGGING
4242                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4243                                 sctp_packet_log(o_pak);
4244 #endif
4245                         /* send it out.  table id is taken from stcb */
4246 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4247                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4248                                 so = SCTP_INP_SO(inp);
4249                                 SCTP_SOCKET_UNLOCK(so, 0);
4250                         }
4251 #endif
4252                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4253 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4254                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4255                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4256                                 SCTP_TCB_UNLOCK(stcb);
4257                                 SCTP_SOCKET_LOCK(so, 0);
4258                                 SCTP_TCB_LOCK(stcb);
4259                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4260                         }
4261 #endif
4262                         SCTP_STAT_INCR(sctps_sendpackets);
4263                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4264                         if (ret)
4265                                 SCTP_STAT_INCR(sctps_senderrors);
4266
4267                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4268                         if (net == NULL) {
4269                                 /* free tempy routes */
4270                                 RO_RTFREE(ro);
4271                         } else {
4272                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4273                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4274                                         uint32_t mtu;
4275
4276                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4277                                         if (mtu > 0) {
4278                                                 if (net->port) {
4279                                                         mtu -= sizeof(struct udphdr);
4280                                                 }
4281                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4282                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4283                                                 }
4284                                                 net->mtu = mtu;
4285                                         }
4286                                 } else if (ro->ro_rt == NULL) {
4287                                         /* route was freed */
4288                                         if (net->ro._s_addr &&
4289                                             net->src_addr_selected) {
4290                                                 sctp_free_ifa(net->ro._s_addr);
4291                                                 net->ro._s_addr = NULL;
4292                                         }
4293                                         net->src_addr_selected = 0;
4294                                 }
4295                         }
4296                         return (ret);
4297                 }
4298 #endif
4299 #ifdef INET6
4300         case AF_INET6:
4301                 {
4302                         uint32_t flowlabel, flowinfo;
4303                         struct ip6_hdr *ip6h;
4304                         struct route_in6 ip6route;
4305                         struct ifnet *ifp;
4306                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4307                         int prev_scope = 0;
4308                         struct sockaddr_in6 lsa6_storage;
4309                         int error;
4310                         u_short prev_port = 0;
4311                         int len;
4312
4313                         if (net) {
4314                                 flowlabel = net->flowlabel;
4315                         } else if (stcb) {
4316                                 flowlabel = stcb->asoc.default_flowlabel;
4317                         } else {
4318                                 flowlabel = inp->sctp_ep.default_flowlabel;
4319                         }
4320                         if (flowlabel == 0) {
4321                                 /*
4322                                  * This means especially, that it is not set
4323                                  * at the SCTP layer. So use the value from
4324                                  * the IP layer.
4325                                  */
4326                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4327                         }
4328                         flowlabel &= 0x000fffff;
4329                         len = SCTP_MIN_OVERHEAD;
4330                         if (port) {
4331                                 len += sizeof(struct udphdr);
4332                         }
4333                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4334                         if (newm == NULL) {
4335                                 sctp_m_freem(m);
4336                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4337                                 return (ENOMEM);
4338                         }
4339                         SCTP_ALIGN_TO_END(newm, len);
4340                         SCTP_BUF_LEN(newm) = len;
4341                         SCTP_BUF_NEXT(newm) = m;
4342                         m = newm;
4343                         if (net != NULL) {
4344                                 m->m_pkthdr.flowid = net->flowid;
4345                                 M_HASHTYPE_SET(m, net->flowtype);
4346                         } else {
4347                                 m->m_pkthdr.flowid = mflowid;
4348                                 M_HASHTYPE_SET(m, mflowtype);
4349                         }
4350                         packet_length = sctp_calculate_len(m);
4351
4352                         ip6h = mtod(m, struct ip6_hdr *);
4353                         /* protect *sin6 from overwrite */
4354                         sin6 = (struct sockaddr_in6 *)to;
4355                         tmp = *sin6;
4356                         sin6 = &tmp;
4357
4358                         /* KAME hack: embed scopeid */
4359                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4360                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4361                                 return (EINVAL);
4362                         }
4363                         if (net == NULL) {
4364                                 memset(&ip6route, 0, sizeof(ip6route));
4365                                 ro = (sctp_route_t *)&ip6route;
4366                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4367                         } else {
4368                                 ro = (sctp_route_t *)&net->ro;
4369                         }
4370                         /*
4371                          * We assume here that inp_flow is in host byte
4372                          * order within the TCB!
4373                          */
4374                         if (tos_value == 0) {
4375                                 /*
4376                                  * This means especially, that it is not set
4377                                  * at the SCTP layer. So use the value from
4378                                  * the IP layer.
4379                                  */
4380                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4381                         }
4382                         tos_value &= 0xfc;
4383                         if (ecn_ok) {
4384                                 tos_value |= sctp_get_ect(stcb);
4385                         }
4386                         flowinfo = 0x06;
4387                         flowinfo <<= 8;
4388                         flowinfo |= tos_value;
4389                         flowinfo <<= 20;
4390                         flowinfo |= flowlabel;
4391                         ip6h->ip6_flow = htonl(flowinfo);
4392                         if (port) {
4393                                 ip6h->ip6_nxt = IPPROTO_UDP;
4394                         } else {
4395                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4396                         }
4397                         ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4398                         ip6h->ip6_dst = sin6->sin6_addr;
4399
4400                         /*
4401                          * Add SRC address selection here: we can only reuse
4402                          * to a limited degree the kame src-addr-sel, since
4403                          * we can try their selection but it may not be
4404                          * bound.
4405                          */
4406                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4407                         lsa6_tmp.sin6_family = AF_INET6;
4408                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4409                         lsa6 = &lsa6_tmp;
4410                         if (net && out_of_asoc_ok == 0) {
4411                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4412                                         sctp_free_ifa(net->ro._s_addr);
4413                                         net->ro._s_addr = NULL;
4414                                         net->src_addr_selected = 0;
4415                                         if (ro->ro_rt) {
4416                                                 RTFREE(ro->ro_rt);
4417                                                 ro->ro_rt = NULL;
4418                                         }
4419                                 }
4420                                 if (net->src_addr_selected == 0) {
4421                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4422                                         /* KAME hack: embed scopeid */
4423                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4424                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4425                                                 return (EINVAL);
4426                                         }
4427                                         /* Cache the source address */
4428                                         net->ro._s_addr = sctp_source_address_selection(inp,
4429                                             stcb,
4430                                             ro,
4431                                             net,
4432                                             0,
4433                                             vrf_id);
4434                                         (void)sa6_recoverscope(sin6);
4435                                         net->src_addr_selected = 1;
4436                                 }
4437                                 if (net->ro._s_addr == NULL) {
4438                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4439                                         net->src_addr_selected = 0;
4440                                         sctp_handle_no_route(stcb, net, so_locked);
4441                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4442                                         sctp_m_freem(m);
4443                                         return (EHOSTUNREACH);
4444                                 }
4445                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4446                         } else {
4447                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4448                                 /* KAME hack: embed scopeid */
4449                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4450                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4451                                         return (EINVAL);
4452                                 }
4453                                 if (over_addr == NULL) {
4454                                         struct sctp_ifa *_lsrc;
4455
4456                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4457                                             net,
4458                                             out_of_asoc_ok,
4459                                             vrf_id);
4460                                         if (_lsrc == NULL) {
4461                                                 sctp_handle_no_route(stcb, net, so_locked);
4462                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4463                                                 sctp_m_freem(m);
4464                                                 return (EHOSTUNREACH);
4465                                         }
4466                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4467                                         sctp_free_ifa(_lsrc);
4468                                 } else {
4469                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4470                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4471                                 }
4472                                 (void)sa6_recoverscope(sin6);
4473                         }
4474                         lsa6->sin6_port = inp->sctp_lport;
4475
4476                         if (ro->ro_rt == NULL) {
4477                                 /*
4478                                  * src addr selection failed to find a route
4479                                  * (or valid source addr), so we can't get
4480                                  * there from here!
4481                                  */
4482                                 sctp_handle_no_route(stcb, net, so_locked);
4483                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4484                                 sctp_m_freem(m);
4485                                 return (EHOSTUNREACH);
4486                         }
4487                         /*
4488                          * XXX: sa6 may not have a valid sin6_scope_id in
4489                          * the non-SCOPEDROUTING case.
4490                          */
4491                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4492                         lsa6_storage.sin6_family = AF_INET6;
4493                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4494                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4495                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4496                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4497                                 sctp_m_freem(m);
4498                                 return (error);
4499                         }
4500                         /* XXX */
4501                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4502                         lsa6_storage.sin6_port = inp->sctp_lport;
4503                         lsa6 = &lsa6_storage;
4504                         ip6h->ip6_src = lsa6->sin6_addr;
4505
4506                         if (port) {
4507                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4508                                         sctp_handle_no_route(stcb, net, so_locked);
4509                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4510                                         sctp_m_freem(m);
4511                                         return (EHOSTUNREACH);
4512                                 }
4513                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4514                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4515                                 udp->uh_dport = port;
4516                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4517                                 udp->uh_sum = 0;
4518                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4519                         } else {
4520                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4521                         }
4522
4523                         sctphdr->src_port = src_port;
4524                         sctphdr->dest_port = dest_port;
4525                         sctphdr->v_tag = v_tag;
4526                         sctphdr->checksum = 0;
4527
4528                         /*
4529                          * We set the hop limit now since there is a good
4530                          * chance that our ro pointer is now filled
4531                          */
4532                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4533                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4534
4535 #ifdef SCTP_DEBUG
4536                         /* Copy to be sure something bad is not happening */
4537                         sin6->sin6_addr = ip6h->ip6_dst;
4538                         lsa6->sin6_addr = ip6h->ip6_src;
4539 #endif
4540
4541                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4542                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4543                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4544                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4545                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4546                         if (net) {
4547                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4548                                 /*
4549                                  * preserve the port and scope for link
4550                                  * local send
4551                                  */
4552                                 prev_scope = sin6->sin6_scope_id;
4553                                 prev_port = sin6->sin6_port;
4554                         }
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                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4565                                 SCTP_STAT_INCR(sctps_sendswcrc);
4566                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4567                                         udp->uh_sum = 0xffff;
4568                                 }
4569                         } else {
4570                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4571                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4572                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4573                         }
4574                         /* send it out. table id is taken from stcb */
4575 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4576                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4577                                 so = SCTP_INP_SO(inp);
4578                                 SCTP_SOCKET_UNLOCK(so, 0);
4579                         }
4580 #endif
4581 #ifdef SCTP_PACKET_LOGGING
4582                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4583                                 sctp_packet_log(o_pak);
4584 #endif
4585                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4586 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4587                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4588                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4589                                 SCTP_TCB_UNLOCK(stcb);
4590                                 SCTP_SOCKET_LOCK(so, 0);
4591                                 SCTP_TCB_LOCK(stcb);
4592                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4593                         }
4594 #endif
4595                         if (net) {
4596                                 /* for link local this must be done */
4597                                 sin6->sin6_scope_id = prev_scope;
4598                                 sin6->sin6_port = prev_port;
4599                         }
4600                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4601                         SCTP_STAT_INCR(sctps_sendpackets);
4602                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4603                         if (ret) {
4604                                 SCTP_STAT_INCR(sctps_senderrors);
4605                         }
4606                         if (net == NULL) {
4607                                 /* Now if we had a temp route free it */
4608                                 RO_RTFREE(ro);
4609                         } else {
4610                                 /*
4611                                  * PMTU check versus smallest asoc MTU goes
4612                                  * here
4613                                  */
4614                                 if (ro->ro_rt == NULL) {
4615                                         /* Route was freed */
4616                                         if (net->ro._s_addr &&
4617                                             net->src_addr_selected) {
4618                                                 sctp_free_ifa(net->ro._s_addr);
4619                                                 net->ro._s_addr = NULL;
4620                                         }
4621                                         net->src_addr_selected = 0;
4622                                 }
4623                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4624                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4625                                         uint32_t mtu;
4626
4627                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4628                                         if (mtu > 0) {
4629                                                 if (net->port) {
4630                                                         mtu -= sizeof(struct udphdr);
4631                                                 }
4632                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4633                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4634                                                 }
4635                                                 net->mtu = mtu;
4636                                         }
4637                                 } else if (ifp) {
4638                                         if (ND_IFINFO(ifp)->linkmtu &&
4639                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4640                                                 sctp_mtu_size_reset(inp,
4641                                                     &stcb->asoc,
4642                                                     ND_IFINFO(ifp)->linkmtu);
4643                                         }
4644                                 }
4645                         }
4646                         return (ret);
4647                 }
4648 #endif
4649         default:
4650                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4651                     ((struct sockaddr *)to)->sa_family);
4652                 sctp_m_freem(m);
4653                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4654                 return (EFAULT);
4655         }
4656 }
4657
4658
4659 void
4660 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4661 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4662     SCTP_UNUSED
4663 #endif
4664 )
4665 {
4666         struct mbuf *m, *m_last;
4667         struct sctp_nets *net;
4668         struct sctp_init_chunk *init;
4669         struct sctp_supported_addr_param *sup_addr;
4670         struct sctp_adaptation_layer_indication *ali;
4671         struct sctp_supported_chunk_types_param *pr_supported;
4672         struct sctp_paramhdr *ph;
4673         int cnt_inits_to = 0;
4674         int error;
4675         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4676
4677         /* INIT's always go to the primary (and usually ONLY address) */
4678         net = stcb->asoc.primary_destination;
4679         if (net == NULL) {
4680                 net = TAILQ_FIRST(&stcb->asoc.nets);
4681                 if (net == NULL) {
4682                         /* TSNH */
4683                         return;
4684                 }
4685                 /* we confirm any address we send an INIT to */
4686                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4687                 (void)sctp_set_primary_addr(stcb, NULL, net);
4688         } else {
4689                 /* we confirm any address we send an INIT to */
4690                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4691         }
4692         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4693 #ifdef INET6
4694         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4695                 /*
4696                  * special hook, if we are sending to link local it will not
4697                  * show up in our private address count.
4698                  */
4699                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4700                         cnt_inits_to = 1;
4701         }
4702 #endif
4703         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4704                 /* This case should not happen */
4705                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4706                 return;
4707         }
4708         /* start the INIT timer */
4709         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4710
4711         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4712         if (m == NULL) {
4713                 /* No memory, INIT timer will re-attempt. */
4714                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4715                 return;
4716         }
4717         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4718         padding_len = 0;
4719         /* Now lets put the chunk header in place */
4720         init = mtod(m, struct sctp_init_chunk *);
4721         /* now the chunk header */
4722         init->ch.chunk_type = SCTP_INITIATION;
4723         init->ch.chunk_flags = 0;
4724         /* fill in later from mbuf we build */
4725         init->ch.chunk_length = 0;
4726         /* place in my tag */
4727         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4728         /* set up some of the credits. */
4729         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4730             SCTP_MINIMAL_RWND));
4731         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4732         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4733         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4734
4735         /* Adaptation layer indication parameter */
4736         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4737                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4738                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4739                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4740                 ali->ph.param_length = htons(parameter_len);
4741                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4742                 chunk_len += parameter_len;
4743         }
4744
4745         /* ECN parameter */
4746         if (stcb->asoc.ecn_supported == 1) {
4747                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4748                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4749                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4750                 ph->param_length = htons(parameter_len);
4751                 chunk_len += parameter_len;
4752         }
4753
4754         /* PR-SCTP supported parameter */
4755         if (stcb->asoc.prsctp_supported == 1) {
4756                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4757                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4758                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4759                 ph->param_length = htons(parameter_len);
4760                 chunk_len += parameter_len;
4761         }
4762
4763         /* Add NAT friendly parameter. */
4764         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4765                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4766                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4767                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4768                 ph->param_length = htons(parameter_len);
4769                 chunk_len += parameter_len;
4770         }
4771
4772         /* And now tell the peer which extensions we support */
4773         num_ext = 0;
4774         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4775         if (stcb->asoc.prsctp_supported == 1) {
4776                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4777                 if (stcb->asoc.idata_supported) {
4778                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4779                 }
4780         }
4781         if (stcb->asoc.auth_supported == 1) {
4782                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4783         }
4784         if (stcb->asoc.asconf_supported == 1) {
4785                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4786                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4787         }
4788         if (stcb->asoc.reconfig_supported == 1) {
4789                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4790         }
4791         if (stcb->asoc.idata_supported) {
4792                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4793         }
4794         if (stcb->asoc.nrsack_supported == 1) {
4795                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4796         }
4797         if (stcb->asoc.pktdrop_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4799         }
4800         if (num_ext > 0) {
4801                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4802                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4803                 pr_supported->ph.param_length = htons(parameter_len);
4804                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4805                 chunk_len += parameter_len;
4806         }
4807         /* add authentication parameters */
4808         if (stcb->asoc.auth_supported) {
4809                 /* attach RANDOM parameter, if available */
4810                 if (stcb->asoc.authinfo.random != NULL) {
4811                         struct sctp_auth_random *randp;
4812
4813                         if (padding_len > 0) {
4814                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4815                                 chunk_len += padding_len;
4816                                 padding_len = 0;
4817                         }
4818                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4819                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4820                         /* random key already contains the header */
4821                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4822                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4823                         chunk_len += parameter_len;
4824                 }
4825                 /* add HMAC_ALGO parameter */
4826                 if (stcb->asoc.local_hmacs != NULL) {
4827                         struct sctp_auth_hmac_algo *hmacs;
4828
4829                         if (padding_len > 0) {
4830                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4831                                 chunk_len += padding_len;
4832                                 padding_len = 0;
4833                         }
4834                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4835                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4836                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4837                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4838                         hmacs->ph.param_length = htons(parameter_len);
4839                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4840                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4841                         chunk_len += parameter_len;
4842                 }
4843                 /* add CHUNKS parameter */
4844                 if (stcb->asoc.local_auth_chunks != NULL) {
4845                         struct sctp_auth_chunk_list *chunks;
4846
4847                         if (padding_len > 0) {
4848                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4849                                 chunk_len += padding_len;
4850                                 padding_len = 0;
4851                         }
4852                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4853                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4854                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4855                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4856                         chunks->ph.param_length = htons(parameter_len);
4857                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4858                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4859                         chunk_len += parameter_len;
4860                 }
4861         }
4862
4863         /* now any cookie time extensions */
4864         if (stcb->asoc.cookie_preserve_req) {
4865                 struct sctp_cookie_perserve_param *cookie_preserve;
4866
4867                 if (padding_len > 0) {
4868                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4869                         chunk_len += padding_len;
4870                         padding_len = 0;
4871                 }
4872                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4873                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4874                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4875                 cookie_preserve->ph.param_length = htons(parameter_len);
4876                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4877                 stcb->asoc.cookie_preserve_req = 0;
4878                 chunk_len += parameter_len;
4879         }
4880
4881         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4882                 uint8_t i;
4883
4884                 if (padding_len > 0) {
4885                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4886                         chunk_len += padding_len;
4887                         padding_len = 0;
4888                 }
4889                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4890                 if (stcb->asoc.scope.ipv4_addr_legal) {
4891                         parameter_len += (uint16_t)sizeof(uint16_t);
4892                 }
4893                 if (stcb->asoc.scope.ipv6_addr_legal) {
4894                         parameter_len += (uint16_t)sizeof(uint16_t);
4895                 }
4896                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4897                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4898                 sup_addr->ph.param_length = htons(parameter_len);
4899                 i = 0;
4900                 if (stcb->asoc.scope.ipv4_addr_legal) {
4901                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4902                 }
4903                 if (stcb->asoc.scope.ipv6_addr_legal) {
4904                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4905                 }
4906                 padding_len = 4 - 2 * i;
4907                 chunk_len += parameter_len;
4908         }
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         if ((error = 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, "Gak send error %d\n", error);
4938                 if (error == ENOBUFS) {
4939                         stcb->asoc.ifp_had_enobuf = 1;
4940                         SCTP_STAT_INCR(sctps_lowlevelerr);
4941                 }
4942         } else {
4943                 stcb->asoc.ifp_had_enobuf = 0;
4944         }
4945         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4946         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4947 }
4948
4949 struct mbuf *
4950 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4951     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4952 {
4953         /*
4954          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4955          * being equal to the beginning of the params i.e. (iphlen +
4956          * sizeof(struct sctp_init_msg) parse through the parameters to the
4957          * end of the mbuf verifying that all parameters are known.
4958          *
4959          * For unknown parameters build and return a mbuf with
4960          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4961          * processing this chunk stop, and set *abort_processing to 1.
4962          *
4963          * By having param_offset be pre-set to where parameters begin it is
4964          * hoped that this routine may be reused in the future by new
4965          * features.
4966          */
4967         struct sctp_paramhdr *phdr, params;
4968
4969         struct mbuf *mat, *op_err;
4970         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4971         int at, limit, pad_needed;
4972         uint16_t ptype, plen, padded_size;
4973         int err_at;
4974
4975         *abort_processing = 0;
4976         mat = in_initpkt;
4977         err_at = 0;
4978         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4979         at = param_offset;
4980         op_err = NULL;
4981         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4982         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4983         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4984                 ptype = ntohs(phdr->param_type);
4985                 plen = ntohs(phdr->param_length);
4986                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4987                         /* wacked parameter */
4988                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4989                         goto invalid_size;
4990                 }
4991                 limit -= SCTP_SIZE32(plen);
4992                 /*-
4993                  * All parameters for all chunks that we know/understand are
4994                  * listed here. We process them other places and make
4995                  * appropriate stop actions per the upper bits. However this
4996                  * is the generic routine processor's can call to get back
4997                  * an operr.. to either incorporate (init-ack) or send.
4998                  */
4999                 padded_size = SCTP_SIZE32(plen);
5000                 switch (ptype) {
5001                         /* Param's with variable size */
5002                 case SCTP_HEARTBEAT_INFO:
5003                 case SCTP_STATE_COOKIE:
5004                 case SCTP_UNRECOG_PARAM:
5005                 case SCTP_ERROR_CAUSE_IND:
5006                         /* ok skip fwd */
5007                         at += padded_size;
5008                         break;
5009                         /* Param's with variable size within a range */
5010                 case SCTP_CHUNK_LIST:
5011                 case SCTP_SUPPORTED_CHUNK_EXT:
5012                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5013                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5014                                 goto invalid_size;
5015                         }
5016                         at += padded_size;
5017                         break;
5018                 case SCTP_SUPPORTED_ADDRTYPE:
5019                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5020                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5021                                 goto invalid_size;
5022                         }
5023                         at += padded_size;
5024                         break;
5025                 case SCTP_RANDOM:
5026                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5027                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5028                                 goto invalid_size;
5029                         }
5030                         at += padded_size;
5031                         break;
5032                 case SCTP_SET_PRIM_ADDR:
5033                 case SCTP_DEL_IP_ADDRESS:
5034                 case SCTP_ADD_IP_ADDRESS:
5035                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5036                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5037                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5038                                 goto invalid_size;
5039                         }
5040                         at += padded_size;
5041                         break;
5042                         /* Param's with a fixed size */
5043                 case SCTP_IPV4_ADDRESS:
5044                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5045                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5046                                 goto invalid_size;
5047                         }
5048                         at += padded_size;
5049                         break;
5050                 case SCTP_IPV6_ADDRESS:
5051                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5053                                 goto invalid_size;
5054                         }
5055                         at += padded_size;
5056                         break;
5057                 case SCTP_COOKIE_PRESERVE:
5058                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5059                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5060                                 goto invalid_size;
5061                         }
5062                         at += padded_size;
5063                         break;
5064                 case SCTP_HAS_NAT_SUPPORT:
5065                         *nat_friendly = 1;
5066                         /* fall through */
5067                 case SCTP_PRSCTP_SUPPORTED:
5068                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5069                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5070                                 goto invalid_size;
5071                         }
5072                         at += padded_size;
5073                         break;
5074                 case SCTP_ECN_CAPABLE:
5075                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5076                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5077                                 goto invalid_size;
5078                         }
5079                         at += padded_size;
5080                         break;
5081                 case SCTP_ULP_ADAPTATION:
5082                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5083                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5084                                 goto invalid_size;
5085                         }
5086                         at += padded_size;
5087                         break;
5088                 case SCTP_SUCCESS_REPORT:
5089                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5091                                 goto invalid_size;
5092                         }
5093                         at += padded_size;
5094                         break;
5095                 case SCTP_HOSTNAME_ADDRESS:
5096                         {
5097                                 /* We can NOT handle HOST NAME addresses!! */
5098                                 int l_len;
5099
5100                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5101                                 *abort_processing = 1;
5102                                 if (op_err == NULL) {
5103                                         /* Ok need to try to get a mbuf */
5104 #ifdef INET6
5105                                         l_len = SCTP_MIN_OVERHEAD;
5106 #else
5107                                         l_len = SCTP_MIN_V4_OVERHEAD;
5108 #endif
5109                                         l_len += sizeof(struct sctp_chunkhdr);
5110                                         l_len += plen;
5111                                         l_len += sizeof(struct sctp_paramhdr);
5112                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5113                                         if (op_err) {
5114                                                 SCTP_BUF_LEN(op_err) = 0;
5115                                                 /*
5116                                                  * pre-reserve space for ip
5117                                                  * and sctp header  and
5118                                                  * chunk hdr
5119                                                  */
5120 #ifdef INET6
5121                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5122 #else
5123                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5124 #endif
5125                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5127                                         }
5128                                 }
5129                                 if (op_err) {
5130                                         /* If we have space */
5131                                         struct sctp_paramhdr s;
5132
5133                                         if (err_at % 4) {
5134                                                 uint32_t cpthis = 0;
5135
5136                                                 pad_needed = 4 - (err_at % 4);
5137                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5138                                                 err_at += pad_needed;
5139                                         }
5140                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5141                                         s.param_length = htons(sizeof(s) + plen);
5142                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5143                                         err_at += sizeof(s);
5144                                         if (plen > sizeof(tempbuf)) {
5145                                                 plen = sizeof(tempbuf);
5146                                         }
5147                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5148                                         if (phdr == NULL) {
5149                                                 sctp_m_freem(op_err);
5150                                                 /*
5151                                                  * we are out of memory but
5152                                                  * we still need to have a
5153                                                  * look at what to do (the
5154                                                  * system is in trouble
5155                                                  * though).
5156                                                  */
5157                                                 return (NULL);
5158                                         }
5159                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5160                                 }
5161                                 return (op_err);
5162                                 break;
5163                         }
5164                 default:
5165                         /*
5166                          * we do not recognize the parameter figure out what
5167                          * we do.
5168                          */
5169                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5170                         if ((ptype & 0x4000) == 0x4000) {
5171                                 /* Report bit is set?? */
5172                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5173                                 if (op_err == NULL) {
5174                                         int l_len;
5175
5176                                         /* Ok need to try to get an mbuf */
5177 #ifdef INET6
5178                                         l_len = SCTP_MIN_OVERHEAD;
5179 #else
5180                                         l_len = SCTP_MIN_V4_OVERHEAD;
5181 #endif
5182                                         l_len += sizeof(struct sctp_chunkhdr);
5183                                         l_len += plen;
5184                                         l_len += sizeof(struct sctp_paramhdr);
5185                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5186                                         if (op_err) {
5187                                                 SCTP_BUF_LEN(op_err) = 0;
5188 #ifdef INET6
5189                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5190 #else
5191                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5192 #endif
5193                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5195                                         }
5196                                 }
5197                                 if (op_err) {
5198                                         /* If we have space */
5199                                         struct sctp_paramhdr s;
5200
5201                                         if (err_at % 4) {
5202                                                 uint32_t cpthis = 0;
5203
5204                                                 pad_needed = 4 - (err_at % 4);
5205                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5206                                                 err_at += pad_needed;
5207                                         }
5208                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5209                                         s.param_length = htons(sizeof(s) + plen);
5210                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5211                                         err_at += sizeof(s);
5212                                         if (plen > sizeof(tempbuf)) {
5213                                                 plen = sizeof(tempbuf);
5214                                         }
5215                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5216                                         if (phdr == NULL) {
5217                                                 sctp_m_freem(op_err);
5218                                                 /*
5219                                                  * we are out of memory but
5220                                                  * we still need to have a
5221                                                  * look at what to do (the
5222                                                  * system is in trouble
5223                                                  * though).
5224                                                  */
5225                                                 op_err = NULL;
5226                                                 goto more_processing;
5227                                         }
5228                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5229                                         err_at += plen;
5230                                 }
5231                         }
5232         more_processing:
5233                         if ((ptype & 0x8000) == 0x0000) {
5234                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5235                                 return (op_err);
5236                         } else {
5237                                 /* skip this chunk and continue processing */
5238                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5239                                 at += SCTP_SIZE32(plen);
5240                         }
5241                         break;
5242
5243                 }
5244                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5245         }
5246         return (op_err);
5247 invalid_size:
5248         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5249         *abort_processing = 1;
5250         if ((op_err == NULL) && phdr) {
5251                 int l_len;
5252 #ifdef INET6
5253                 l_len = SCTP_MIN_OVERHEAD;
5254 #else
5255                 l_len = SCTP_MIN_V4_OVERHEAD;
5256 #endif
5257                 l_len += sizeof(struct sctp_chunkhdr);
5258                 l_len += (2 * sizeof(struct sctp_paramhdr));
5259                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5260                 if (op_err) {
5261                         SCTP_BUF_LEN(op_err) = 0;
5262 #ifdef INET6
5263                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5264 #else
5265                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5266 #endif
5267                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5268                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5269                 }
5270         }
5271         if ((op_err) && phdr) {
5272                 struct sctp_paramhdr s;
5273
5274                 if (err_at % 4) {
5275                         uint32_t cpthis = 0;
5276
5277                         pad_needed = 4 - (err_at % 4);
5278                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5279                         err_at += pad_needed;
5280                 }
5281                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5282                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5283                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5284                 err_at += sizeof(s);
5285                 /* Only copy back the p-hdr that caused the issue */
5286                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5287         }
5288         return (op_err);
5289 }
5290
5291 static int
5292 sctp_are_there_new_addresses(struct sctp_association *asoc,
5293     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5294 {
5295         /*
5296          * Given a INIT packet, look through the packet to verify that there
5297          * are NO new addresses. As we go through the parameters add reports
5298          * of any un-understood parameters that require an error.  Also we
5299          * must return (1) to drop the packet if we see a un-understood
5300          * parameter that tells us to drop the chunk.
5301          */
5302         struct sockaddr *sa_touse;
5303         struct sockaddr *sa;
5304         struct sctp_paramhdr *phdr, params;
5305         uint16_t ptype, plen;
5306         uint8_t fnd;
5307         struct sctp_nets *net;
5308         int check_src;
5309 #ifdef INET
5310         struct sockaddr_in sin4, *sa4;
5311 #endif
5312 #ifdef INET6
5313         struct sockaddr_in6 sin6, *sa6;
5314 #endif
5315
5316 #ifdef INET
5317         memset(&sin4, 0, sizeof(sin4));
5318         sin4.sin_family = AF_INET;
5319         sin4.sin_len = sizeof(sin4);
5320 #endif
5321 #ifdef INET6
5322         memset(&sin6, 0, sizeof(sin6));
5323         sin6.sin6_family = AF_INET6;
5324         sin6.sin6_len = sizeof(sin6);
5325 #endif
5326         /* First what about the src address of the pkt ? */
5327         check_src = 0;
5328         switch (src->sa_family) {
5329 #ifdef INET
5330         case AF_INET:
5331                 if (asoc->scope.ipv4_addr_legal) {
5332                         check_src = 1;
5333                 }
5334                 break;
5335 #endif
5336 #ifdef INET6
5337         case AF_INET6:
5338                 if (asoc->scope.ipv6_addr_legal) {
5339                         check_src = 1;
5340                 }
5341                 break;
5342 #endif
5343         default:
5344                 /* TSNH */
5345                 break;
5346         }
5347         if (check_src) {
5348                 fnd = 0;
5349                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5350                         sa = (struct sockaddr *)&net->ro._l_addr;
5351                         if (sa->sa_family == src->sa_family) {
5352 #ifdef INET
5353                                 if (sa->sa_family == AF_INET) {
5354                                         struct sockaddr_in *src4;
5355
5356                                         sa4 = (struct sockaddr_in *)sa;
5357                                         src4 = (struct sockaddr_in *)src;
5358                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5359                                                 fnd = 1;
5360                                                 break;
5361                                         }
5362                                 }
5363 #endif
5364 #ifdef INET6
5365                                 if (sa->sa_family == AF_INET6) {
5366                                         struct sockaddr_in6 *src6;
5367
5368                                         sa6 = (struct sockaddr_in6 *)sa;
5369                                         src6 = (struct sockaddr_in6 *)src;
5370                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5371                                                 fnd = 1;
5372                                                 break;
5373                                         }
5374                                 }
5375 #endif
5376                         }
5377                 }
5378                 if (fnd == 0) {
5379                         /* New address added! no need to look further. */
5380                         return (1);
5381                 }
5382         }
5383         /* Ok so far lets munge through the rest of the packet */
5384         offset += sizeof(struct sctp_init_chunk);
5385         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5386         while (phdr) {
5387                 sa_touse = NULL;
5388                 ptype = ntohs(phdr->param_type);
5389                 plen = ntohs(phdr->param_length);
5390                 switch (ptype) {
5391 #ifdef INET
5392                 case SCTP_IPV4_ADDRESS:
5393                         {
5394                                 struct sctp_ipv4addr_param *p4, p4_buf;
5395
5396                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5397                                         return (1);
5398                                 }
5399                                 phdr = sctp_get_next_param(in_initpkt, offset,
5400                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5401                                 if (phdr == NULL) {
5402                                         return (1);
5403                                 }
5404                                 if (asoc->scope.ipv4_addr_legal) {
5405                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5406                                         sin4.sin_addr.s_addr = p4->addr;
5407                                         sa_touse = (struct sockaddr *)&sin4;
5408                                 }
5409                                 break;
5410                         }
5411 #endif
5412 #ifdef INET6
5413                 case SCTP_IPV6_ADDRESS:
5414                         {
5415                                 struct sctp_ipv6addr_param *p6, p6_buf;
5416
5417                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5418                                         return (1);
5419                                 }
5420                                 phdr = sctp_get_next_param(in_initpkt, offset,
5421                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5422                                 if (phdr == NULL) {
5423                                         return (1);
5424                                 }
5425                                 if (asoc->scope.ipv6_addr_legal) {
5426                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5427                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5428                                             sizeof(p6->addr));
5429                                         sa_touse = (struct sockaddr *)&sin6;
5430                                 }
5431                                 break;
5432                         }
5433 #endif
5434                 default:
5435                         sa_touse = NULL;
5436                         break;
5437                 }
5438                 if (sa_touse) {
5439                         /* ok, sa_touse points to one to check */
5440                         fnd = 0;
5441                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5442                                 sa = (struct sockaddr *)&net->ro._l_addr;
5443                                 if (sa->sa_family != sa_touse->sa_family) {
5444                                         continue;
5445                                 }
5446 #ifdef INET
5447                                 if (sa->sa_family == AF_INET) {
5448                                         sa4 = (struct sockaddr_in *)sa;
5449                                         if (sa4->sin_addr.s_addr ==
5450                                             sin4.sin_addr.s_addr) {
5451                                                 fnd = 1;
5452                                                 break;
5453                                         }
5454                                 }
5455 #endif
5456 #ifdef INET6
5457                                 if (sa->sa_family == AF_INET6) {
5458                                         sa6 = (struct sockaddr_in6 *)sa;
5459                                         if (SCTP6_ARE_ADDR_EQUAL(
5460                                             sa6, &sin6)) {
5461                                                 fnd = 1;
5462                                                 break;
5463                                         }
5464                                 }
5465 #endif
5466                         }
5467                         if (!fnd) {
5468                                 /* New addr added! no need to look further */
5469                                 return (1);
5470                         }
5471                 }
5472                 offset += SCTP_SIZE32(plen);
5473                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5474         }
5475         return (0);
5476 }
5477
5478 /*
5479  * Given a MBUF chain that was sent into us containing an INIT. Build a
5480  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5481  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5482  * message (i.e. the struct sctp_init_msg).
5483  */
5484 void
5485 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5486     struct sctp_nets *src_net, struct mbuf *init_pkt,
5487     int iphlen, int offset,
5488     struct sockaddr *src, struct sockaddr *dst,
5489     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5490     uint8_t mflowtype, uint32_t mflowid,
5491     uint32_t vrf_id, uint16_t port)
5492 {
5493         struct sctp_association *asoc;
5494         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5495         struct sctp_init_ack_chunk *initack;
5496         struct sctp_adaptation_layer_indication *ali;
5497         struct sctp_supported_chunk_types_param *pr_supported;
5498         struct sctp_paramhdr *ph;
5499         union sctp_sockstore *over_addr;
5500         struct sctp_scoping scp;
5501         struct timeval now;
5502 #ifdef INET
5503         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5504         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5505         struct sockaddr_in *sin;
5506 #endif
5507 #ifdef INET6
5508         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5509         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5510         struct sockaddr_in6 *sin6;
5511 #endif
5512         struct sockaddr *to;
5513         struct sctp_state_cookie stc;
5514         struct sctp_nets *net = NULL;
5515         uint8_t *signature = NULL;
5516         int cnt_inits_to = 0;
5517         uint16_t his_limit, i_want;
5518         int abort_flag;
5519         int nat_friendly = 0;
5520         int error;
5521         struct socket *so;
5522         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5523
5524         if (stcb) {
5525                 asoc = &stcb->asoc;
5526         } else {
5527                 asoc = NULL;
5528         }
5529         if ((asoc != NULL) &&
5530             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5531                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5532                         /*
5533                          * new addresses, out of here in non-cookie-wait
5534                          * states
5535                          *
5536                          * Send an ABORT, without the new address error
5537                          * cause. This looks no different than if no
5538                          * listener was present.
5539                          */
5540                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5541                             "Address added");
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                 if (src_net != NULL && (src_net->port != port)) {
5548                         /*
5549                          * change of remote encapsulation port, out of here
5550                          * in non-cookie-wait states
5551                          *
5552                          * Send an ABORT, without an specific error cause.
5553                          * This looks no different than if no listener was
5554                          * present.
5555                          */
5556                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5557                             "Remote encapsulation port changed");
5558                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5559                             mflowtype, mflowid, inp->fibnum,
5560                             vrf_id, port);
5561                         return;
5562                 }
5563         }
5564         abort_flag = 0;
5565         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5566             (offset + sizeof(struct sctp_init_chunk)),
5567             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5568         if (abort_flag) {
5569 do_a_abort:
5570                 if (op_err == NULL) {
5571                         char msg[SCTP_DIAG_INFO_LEN];
5572
5573                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5574                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5575                             msg);
5576                 }
5577                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5578                     init_chk->init.initiate_tag, op_err,
5579                     mflowtype, mflowid, inp->fibnum,
5580                     vrf_id, port);
5581                 return;
5582         }
5583         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5584         if (m == NULL) {
5585                 /* No memory, INIT timer will re-attempt. */
5586                 if (op_err)
5587                         sctp_m_freem(op_err);
5588                 return;
5589         }
5590         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5591         padding_len = 0;
5592
5593         /*
5594          * We might not overwrite the identification[] completely and on
5595          * some platforms time_entered will contain some padding. Therefore
5596          * zero out the cookie to avoid putting uninitialized memory on the
5597          * wire.
5598          */
5599         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5600
5601         /* the time I built cookie */
5602         (void)SCTP_GETTIME_TIMEVAL(&now);
5603         stc.time_entered.tv_sec = now.tv_sec;
5604         stc.time_entered.tv_usec = now.tv_usec;
5605
5606         /* populate any tie tags */
5607         if (asoc != NULL) {
5608                 /* unlock before tag selections */
5609                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5610                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5611                 stc.cookie_life = asoc->cookie_life;
5612                 net = asoc->primary_destination;
5613         } else {
5614                 stc.tie_tag_my_vtag = 0;
5615                 stc.tie_tag_peer_vtag = 0;
5616                 /* life I will award this cookie */
5617                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5618         }
5619
5620         /* copy in the ports for later check */
5621         stc.myport = sh->dest_port;
5622         stc.peerport = sh->src_port;
5623
5624         /*
5625          * If we wanted to honor cookie life extensions, we would add to
5626          * stc.cookie_life. For now we should NOT honor any extension
5627          */
5628         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5629         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5630                 stc.ipv6_addr_legal = 1;
5631                 if (SCTP_IPV6_V6ONLY(inp)) {
5632                         stc.ipv4_addr_legal = 0;
5633                 } else {
5634                         stc.ipv4_addr_legal = 1;
5635                 }
5636         } else {
5637                 stc.ipv6_addr_legal = 0;
5638                 stc.ipv4_addr_legal = 1;
5639         }
5640         stc.ipv4_scope = 0;
5641         if (net == NULL) {
5642                 to = src;
5643                 switch (dst->sa_family) {
5644 #ifdef INET
5645                 case AF_INET:
5646                         {
5647                                 /* lookup address */
5648                                 stc.address[0] = src4->sin_addr.s_addr;
5649                                 stc.address[1] = 0;
5650                                 stc.address[2] = 0;
5651                                 stc.address[3] = 0;
5652                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5653                                 /* local from address */
5654                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5655                                 stc.laddress[1] = 0;
5656                                 stc.laddress[2] = 0;
5657                                 stc.laddress[3] = 0;
5658                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5659                                 /* scope_id is only for v6 */
5660                                 stc.scope_id = 0;
5661                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5662                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5663                                         stc.ipv4_scope = 1;
5664                                 }
5665                                 /* Must use the address in this case */
5666                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5667                                         stc.loopback_scope = 1;
5668                                         stc.ipv4_scope = 1;
5669                                         stc.site_scope = 1;
5670                                         stc.local_scope = 0;
5671                                 }
5672                                 break;
5673                         }
5674 #endif
5675 #ifdef INET6
5676                 case AF_INET6:
5677                         {
5678                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5679                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5680                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5681                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5682                                         stc.loopback_scope = 1;
5683                                         stc.local_scope = 0;
5684                                         stc.site_scope = 1;
5685                                         stc.ipv4_scope = 1;
5686                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5687                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5688                                         /*
5689                                          * If the new destination or source
5690                                          * is a LINK_LOCAL we must have
5691                                          * common both site and local scope.
5692                                          * Don't set local scope though
5693                                          * since we must depend on the
5694                                          * source to be added implicitly. We
5695                                          * cannot assure just because we
5696                                          * share one link that all links are
5697                                          * common.
5698                                          */
5699                                         stc.local_scope = 0;
5700                                         stc.site_scope = 1;
5701                                         stc.ipv4_scope = 1;
5702                                         /*
5703                                          * we start counting for the private
5704                                          * address stuff at 1. since the
5705                                          * link local we source from won't
5706                                          * show up in our scoped count.
5707                                          */
5708                                         cnt_inits_to = 1;
5709                                         /*
5710                                          * pull out the scope_id from
5711                                          * incoming pkt
5712                                          */
5713                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5714                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5715                                         /*
5716                                          * If the new destination or source
5717                                          * is SITE_LOCAL then we must have
5718                                          * site scope in common.
5719                                          */
5720                                         stc.site_scope = 1;
5721                                 }
5722                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5723                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5724                                 break;
5725                         }
5726 #endif
5727                 default:
5728                         /* TSNH */
5729                         goto do_a_abort;
5730                         break;
5731                 }
5732         } else {
5733                 /* set the scope per the existing tcb */
5734
5735 #ifdef INET6
5736                 struct sctp_nets *lnet;
5737 #endif
5738
5739                 stc.loopback_scope = asoc->scope.loopback_scope;
5740                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5741                 stc.site_scope = asoc->scope.site_scope;
5742                 stc.local_scope = asoc->scope.local_scope;
5743 #ifdef INET6
5744                 /* Why do we not consider IPv4 LL addresses? */
5745                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5746                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5747                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5748                                         /*
5749                                          * if we have a LL address, start
5750                                          * counting at 1.
5751                                          */
5752                                         cnt_inits_to = 1;
5753                                 }
5754                         }
5755                 }
5756 #endif
5757                 /* use the net pointer */
5758                 to = (struct sockaddr *)&net->ro._l_addr;
5759                 switch (to->sa_family) {
5760 #ifdef INET
5761                 case AF_INET:
5762                         sin = (struct sockaddr_in *)to;
5763                         stc.address[0] = sin->sin_addr.s_addr;
5764                         stc.address[1] = 0;
5765                         stc.address[2] = 0;
5766                         stc.address[3] = 0;
5767                         stc.addr_type = SCTP_IPV4_ADDRESS;
5768                         if (net->src_addr_selected == 0) {
5769                                 /*
5770                                  * strange case here, the INIT should have
5771                                  * did the selection.
5772                                  */
5773                                 net->ro._s_addr = sctp_source_address_selection(inp,
5774                                     stcb, (sctp_route_t *)&net->ro,
5775                                     net, 0, vrf_id);
5776                                 if (net->ro._s_addr == NULL)
5777                                         return;
5778
5779                                 net->src_addr_selected = 1;
5780
5781                         }
5782                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5783                         stc.laddress[1] = 0;
5784                         stc.laddress[2] = 0;
5785                         stc.laddress[3] = 0;
5786                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5787                         /* scope_id is only for v6 */
5788                         stc.scope_id = 0;
5789                         break;
5790 #endif
5791 #ifdef INET6
5792                 case AF_INET6:
5793                         sin6 = (struct sockaddr_in6 *)to;
5794                         memcpy(&stc.address, &sin6->sin6_addr,
5795                             sizeof(struct in6_addr));
5796                         stc.addr_type = SCTP_IPV6_ADDRESS;
5797                         stc.scope_id = sin6->sin6_scope_id;
5798                         if (net->src_addr_selected == 0) {
5799                                 /*
5800                                  * strange case here, the INIT should have
5801                                  * done the selection.
5802                                  */
5803                                 net->ro._s_addr = sctp_source_address_selection(inp,
5804                                     stcb, (sctp_route_t *)&net->ro,
5805                                     net, 0, vrf_id);
5806                                 if (net->ro._s_addr == NULL)
5807                                         return;
5808
5809                                 net->src_addr_selected = 1;
5810                         }
5811                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5812                             sizeof(struct in6_addr));
5813                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5814                         break;
5815 #endif
5816                 }
5817         }
5818         /* Now lets put the SCTP header in place */
5819         initack = mtod(m, struct sctp_init_ack_chunk *);
5820         /* Save it off for quick ref */
5821         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5822         /* who are we */
5823         memcpy(stc.identification, SCTP_VERSION_STRING,
5824             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5825         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5826         /* now the chunk header */
5827         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5828         initack->ch.chunk_flags = 0;
5829         /* fill in later from mbuf we build */
5830         initack->ch.chunk_length = 0;
5831         /* place in my tag */
5832         if ((asoc != NULL) &&
5833             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5834             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5835             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5836                 /* re-use the v-tags and init-seq here */
5837                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5838                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5839         } else {
5840                 uint32_t vtag, itsn;
5841
5842                 if (asoc) {
5843                         atomic_add_int(&asoc->refcnt, 1);
5844                         SCTP_TCB_UNLOCK(stcb);
5845         new_tag:
5846                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5847                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5848                                 /*
5849                                  * Got a duplicate vtag on some guy behind a
5850                                  * nat make sure we don't use it.
5851                                  */
5852                                 goto new_tag;
5853                         }
5854                         initack->init.initiate_tag = htonl(vtag);
5855                         /* get a TSN to use too */
5856                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5857                         initack->init.initial_tsn = htonl(itsn);
5858                         SCTP_TCB_LOCK(stcb);
5859                         atomic_add_int(&asoc->refcnt, -1);
5860                 } else {
5861                         SCTP_INP_INCR_REF(inp);
5862                         SCTP_INP_RUNLOCK(inp);
5863                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5864                         initack->init.initiate_tag = htonl(vtag);
5865                         /* get a TSN to use too */
5866                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5867                         SCTP_INP_RLOCK(inp);
5868                         SCTP_INP_DECR_REF(inp);
5869                 }
5870         }
5871         /* save away my tag to */
5872         stc.my_vtag = initack->init.initiate_tag;
5873
5874         /* set up some of the credits. */
5875         so = inp->sctp_socket;
5876         if (so == NULL) {
5877                 /* memory problem */
5878                 sctp_m_freem(m);
5879                 return;
5880         } else {
5881                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5882         }
5883         /* set what I want */
5884         his_limit = ntohs(init_chk->init.num_inbound_streams);
5885         /* choose what I want */
5886         if (asoc != NULL) {
5887                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5888                         i_want = asoc->streamoutcnt;
5889                 } else {
5890                         i_want = asoc->pre_open_streams;
5891                 }
5892         } else {
5893                 i_want = inp->sctp_ep.pre_open_stream_count;
5894         }
5895         if (his_limit < i_want) {
5896                 /* I Want more :< */
5897                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5898         } else {
5899                 /* I can have what I want :> */
5900                 initack->init.num_outbound_streams = htons(i_want);
5901         }
5902         /* tell him his limit. */
5903         initack->init.num_inbound_streams =
5904             htons(inp->sctp_ep.max_open_streams_intome);
5905
5906         /* adaptation layer indication parameter */
5907         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5908                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5909                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5910                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5911                 ali->ph.param_length = htons(parameter_len);
5912                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5913                 chunk_len += parameter_len;
5914         }
5915
5916         /* ECN parameter */
5917         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5918             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5919                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5920                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5921                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5922                 ph->param_length = htons(parameter_len);
5923                 chunk_len += parameter_len;
5924         }
5925
5926         /* PR-SCTP supported parameter */
5927         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5928             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5929                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5930                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5931                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5932                 ph->param_length = htons(parameter_len);
5933                 chunk_len += parameter_len;
5934         }
5935
5936         /* Add NAT friendly parameter */
5937         if (nat_friendly) {
5938                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5939                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5940                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5941                 ph->param_length = htons(parameter_len);
5942                 chunk_len += parameter_len;
5943         }
5944
5945         /* And now tell the peer which extensions we support */
5946         num_ext = 0;
5947         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5948         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5949             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5950                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5951                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5952                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5953                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5954                 }
5955         }
5956         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5957             ((asoc == NULL) && (inp->auth_supported == 1))) {
5958                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5959         }
5960         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5961             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5962                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5963                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5964         }
5965         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5966             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5967                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5968         }
5969         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5970             ((asoc == NULL) && (inp->idata_supported == 1))) {
5971                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5972         }
5973         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5974             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5975                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5976         }
5977         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5978             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5979                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5980         }
5981         if (num_ext > 0) {
5982                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5983                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5984                 pr_supported->ph.param_length = htons(parameter_len);
5985                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5986                 chunk_len += parameter_len;
5987         }
5988
5989         /* add authentication parameters */
5990         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5991             ((asoc == NULL) && (inp->auth_supported == 1))) {
5992                 struct sctp_auth_random *randp;
5993                 struct sctp_auth_hmac_algo *hmacs;
5994                 struct sctp_auth_chunk_list *chunks;
5995
5996                 if (padding_len > 0) {
5997                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5998                         chunk_len += padding_len;
5999                         padding_len = 0;
6000                 }
6001                 /* generate and add RANDOM parameter */
6002                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6003                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6004                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6005                 randp->ph.param_type = htons(SCTP_RANDOM);
6006                 randp->ph.param_length = htons(parameter_len);
6007                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6008                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6009                 chunk_len += parameter_len;
6010
6011                 if (padding_len > 0) {
6012                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6013                         chunk_len += padding_len;
6014                         padding_len = 0;
6015                 }
6016                 /* add HMAC_ALGO parameter */
6017                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6018                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6019                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6020                     (uint8_t *)hmacs->hmac_ids);
6021                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6022                 hmacs->ph.param_length = htons(parameter_len);
6023                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6024                 chunk_len += parameter_len;
6025
6026                 if (padding_len > 0) {
6027                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6028                         chunk_len += padding_len;
6029                         padding_len = 0;
6030                 }
6031                 /* add CHUNKS parameter */
6032                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6033                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6034                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6035                     chunks->chunk_types);
6036                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6037                 chunks->ph.param_length = htons(parameter_len);
6038                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6039                 chunk_len += parameter_len;
6040         }
6041         SCTP_BUF_LEN(m) = chunk_len;
6042         m_last = m;
6043         /* now the addresses */
6044         /*
6045          * To optimize this we could put the scoping stuff into a structure
6046          * and remove the individual uint8's from the stc structure. Then we
6047          * could just sifa in the address within the stc.. but for now this
6048          * is a quick hack to get the address stuff teased apart.
6049          */
6050         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6051         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6052         scp.loopback_scope = stc.loopback_scope;
6053         scp.ipv4_local_scope = stc.ipv4_scope;
6054         scp.local_scope = stc.local_scope;
6055         scp.site_scope = stc.site_scope;
6056         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6057             cnt_inits_to,
6058             &padding_len, &chunk_len);
6059         /* padding_len can only be positive, if no addresses have been added */
6060         if (padding_len > 0) {
6061                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6062                 chunk_len += padding_len;
6063                 SCTP_BUF_LEN(m) += padding_len;
6064                 padding_len = 0;
6065         }
6066
6067         /* tack on the operational error if present */
6068         if (op_err) {
6069                 parameter_len = 0;
6070                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6071                         parameter_len += SCTP_BUF_LEN(m_tmp);
6072                 }
6073                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6074                 SCTP_BUF_NEXT(m_last) = op_err;
6075                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6076                         m_last = SCTP_BUF_NEXT(m_last);
6077                 }
6078                 chunk_len += parameter_len;
6079         }
6080         if (padding_len > 0) {
6081                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6082                 if (m_last == NULL) {
6083                         /* Houston we have a problem, no space */
6084                         sctp_m_freem(m);
6085                         return;
6086                 }
6087                 chunk_len += padding_len;
6088                 padding_len = 0;
6089         }
6090         /* Now we must build a cookie */
6091         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6092         if (m_cookie == NULL) {
6093                 /* memory problem */
6094                 sctp_m_freem(m);
6095                 return;
6096         }
6097         /* Now append the cookie to the end and update the space/size */
6098         SCTP_BUF_NEXT(m_last) = m_cookie;
6099         parameter_len = 0;
6100         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6101                 parameter_len += SCTP_BUF_LEN(m_tmp);
6102                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6103                         m_last = m_tmp;
6104                 }
6105         }
6106         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6107         chunk_len += parameter_len;
6108
6109         /*
6110          * Place in the size, but we don't include the last pad (if any) in
6111          * the INIT-ACK.
6112          */
6113         initack->ch.chunk_length = htons(chunk_len);
6114
6115         /*
6116          * Time to sign the cookie, we don't sign over the cookie signature
6117          * though thus we set trailer.
6118          */
6119         (void)sctp_hmac_m(SCTP_HMAC,
6120             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6121             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6122             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6123         /*
6124          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6125          * here since the timer will drive a retranmission.
6126          */
6127         if (padding_len > 0) {
6128                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6129                         sctp_m_freem(m);
6130                         return;
6131                 }
6132         }
6133         if (stc.loopback_scope) {
6134                 over_addr = (union sctp_sockstore *)dst;
6135         } else {
6136                 over_addr = NULL;
6137         }
6138
6139         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6140             0, 0,
6141             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6142             port, over_addr,
6143             mflowtype, mflowid,
6144             SCTP_SO_NOT_LOCKED))) {
6145                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6146                 if (error == ENOBUFS) {
6147                         if (asoc != NULL) {
6148                                 asoc->ifp_had_enobuf = 1;
6149                         }
6150                         SCTP_STAT_INCR(sctps_lowlevelerr);
6151                 }
6152         } else {
6153                 if (asoc != NULL) {
6154                         asoc->ifp_had_enobuf = 0;
6155                 }
6156         }
6157         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6158 }
6159
6160
6161 static void
6162 sctp_prune_prsctp(struct sctp_tcb *stcb,
6163     struct sctp_association *asoc,
6164     struct sctp_sndrcvinfo *srcv,
6165     int dataout)
6166 {
6167         int freed_spc = 0;
6168         struct sctp_tmit_chunk *chk, *nchk;
6169
6170         SCTP_TCB_LOCK_ASSERT(stcb);
6171         if ((asoc->prsctp_supported) &&
6172             (asoc->sent_queue_cnt_removeable > 0)) {
6173                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6174                         /*
6175                          * Look for chunks marked with the PR_SCTP flag AND
6176                          * the buffer space flag. If the one being sent is
6177                          * equal or greater priority then purge the old one
6178                          * and free some space.
6179                          */
6180                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6181                                 /*
6182                                  * This one is PR-SCTP AND buffer space
6183                                  * limited type
6184                                  */
6185                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6186                                         /*
6187                                          * Lower numbers equates to higher
6188                                          * priority so if the one we are
6189                                          * looking at has a larger or equal
6190                                          * priority we want to drop the data
6191                                          * and NOT retransmit it.
6192                                          */
6193                                         if (chk->data) {
6194                                                 /*
6195                                                  * We release the book_size
6196                                                  * if the mbuf is here
6197                                                  */
6198                                                 int ret_spc;
6199                                                 uint8_t sent;
6200
6201                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6202                                                         sent = 1;
6203                                                 else
6204                                                         sent = 0;
6205                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6206                                                     sent,
6207                                                     SCTP_SO_LOCKED);
6208                                                 freed_spc += ret_spc;
6209                                                 if (freed_spc >= dataout) {
6210                                                         return;
6211                                                 }
6212                                         }       /* if chunk was present */
6213                                 }       /* if of sufficient priority */
6214                         }       /* if chunk has enabled */
6215                 }               /* tailqforeach */
6216
6217                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6218                         /* Here we must move to the sent queue and mark */
6219                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6220                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6221                                         if (chk->data) {
6222                                                 /*
6223                                                  * We release the book_size
6224                                                  * if the mbuf is here
6225                                                  */
6226                                                 int ret_spc;
6227
6228                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6229                                                     0, SCTP_SO_LOCKED);
6230
6231                                                 freed_spc += ret_spc;
6232                                                 if (freed_spc >= dataout) {
6233                                                         return;
6234                                                 }
6235                                         }       /* end if chk->data */
6236                                 }       /* end if right class */
6237                         }       /* end if chk pr-sctp */
6238                 }               /* tailqforeachsafe (chk) */
6239         }                       /* if enabled in asoc */
6240 }
6241
6242 int
6243 sctp_get_frag_point(struct sctp_tcb *stcb,
6244     struct sctp_association *asoc)
6245 {
6246         int siz, ovh;
6247
6248         /*
6249          * For endpoints that have both v6 and v4 addresses we must reserve
6250          * room for the ipv6 header, for those that are only dealing with V4
6251          * we use a larger frag point.
6252          */
6253         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6254                 ovh = SCTP_MIN_OVERHEAD;
6255         } else {
6256                 ovh = SCTP_MIN_V4_OVERHEAD;
6257         }
6258         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6259         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6260                 siz = asoc->smallest_mtu - ovh;
6261         else
6262                 siz = (stcb->asoc.sctp_frag_point - ovh);
6263         /*
6264          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6265          */
6266         /* A data chunk MUST fit in a cluster */
6267         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6268         /* } */
6269
6270         /* adjust for an AUTH chunk if DATA requires auth */
6271         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6272                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6273
6274         if (siz % 4) {
6275                 /* make it an even word boundary please */
6276                 siz -= (siz % 4);
6277         }
6278         return (siz);
6279 }
6280
6281 static void
6282 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6283 {
6284         /*
6285          * We assume that the user wants PR_SCTP_TTL if the user provides a
6286          * positive lifetime but does not specify any PR_SCTP policy.
6287          */
6288         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6289                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6290         } else if (sp->timetolive > 0) {
6291                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6292                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6293         } else {
6294                 return;
6295         }
6296         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6297         case CHUNK_FLAGS_PR_SCTP_BUF:
6298                 /*
6299                  * Time to live is a priority stored in tv_sec when doing
6300                  * the buffer drop thing.
6301                  */
6302                 sp->ts.tv_sec = sp->timetolive;
6303                 sp->ts.tv_usec = 0;
6304                 break;
6305         case CHUNK_FLAGS_PR_SCTP_TTL:
6306                 {
6307                         struct timeval tv;
6308
6309                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6310                         tv.tv_sec = sp->timetolive / 1000;
6311                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6312                         /*
6313                          * TODO sctp_constants.h needs alternative time
6314                          * macros when _KERNEL is undefined.
6315                          */
6316                         timevaladd(&sp->ts, &tv);
6317                 }
6318                 break;
6319         case CHUNK_FLAGS_PR_SCTP_RTX:
6320                 /*
6321                  * Time to live is a the number or retransmissions stored in
6322                  * tv_sec.
6323                  */
6324                 sp->ts.tv_sec = sp->timetolive;
6325                 sp->ts.tv_usec = 0;
6326                 break;
6327         default:
6328                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6329                     "Unknown PR_SCTP policy %u.\n",
6330                     PR_SCTP_POLICY(sp->sinfo_flags));
6331                 break;
6332         }
6333 }
6334
6335 static int
6336 sctp_msg_append(struct sctp_tcb *stcb,
6337     struct sctp_nets *net,
6338     struct mbuf *m,
6339     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6340 {
6341         int error = 0;
6342         struct mbuf *at;
6343         struct sctp_stream_queue_pending *sp = NULL;
6344         struct sctp_stream_out *strm;
6345
6346         /*
6347          * Given an mbuf chain, put it into the association send queue and
6348          * place it on the wheel
6349          */
6350         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6351                 /* Invalid stream number */
6352                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6353                 error = EINVAL;
6354                 goto out_now;
6355         }
6356         if ((stcb->asoc.stream_locked) &&
6357             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6358                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6359                 error = EINVAL;
6360                 goto out_now;
6361         }
6362         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6363         /* Now can we send this? */
6364         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6365             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6366             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6367             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6368                 /* got data while shutting down */
6369                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6370                 error = ECONNRESET;
6371                 goto out_now;
6372         }
6373         sctp_alloc_a_strmoq(stcb, sp);
6374         if (sp == NULL) {
6375                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6376                 error = ENOMEM;
6377                 goto out_now;
6378         }
6379         sp->sinfo_flags = srcv->sinfo_flags;
6380         sp->timetolive = srcv->sinfo_timetolive;
6381         sp->ppid = srcv->sinfo_ppid;
6382         sp->context = srcv->sinfo_context;
6383         sp->fsn = 0;
6384         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6385                 sp->net = net;
6386                 atomic_add_int(&sp->net->ref_count, 1);
6387         } else {
6388                 sp->net = NULL;
6389         }
6390         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6391         sp->sid = srcv->sinfo_stream;
6392         sp->msg_is_complete = 1;
6393         sp->sender_all_done = 1;
6394         sp->some_taken = 0;
6395         sp->data = m;
6396         sp->tail_mbuf = NULL;
6397         sctp_set_prsctp_policy(sp);
6398         /*
6399          * We could in theory (for sendall) sifa the length in, but we would
6400          * still have to hunt through the chain since we need to setup the
6401          * tail_mbuf
6402          */
6403         sp->length = 0;
6404         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6405                 if (SCTP_BUF_NEXT(at) == NULL)
6406                         sp->tail_mbuf = at;
6407                 sp->length += SCTP_BUF_LEN(at);
6408         }
6409         if (srcv->sinfo_keynumber_valid) {
6410                 sp->auth_keyid = srcv->sinfo_keynumber;
6411         } else {
6412                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6413         }
6414         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6415                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6416                 sp->holds_key_ref = 1;
6417         }
6418         if (hold_stcb_lock == 0) {
6419                 SCTP_TCB_SEND_LOCK(stcb);
6420         }
6421         sctp_snd_sb_alloc(stcb, sp->length);
6422         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6423         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6424         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6425         m = NULL;
6426         if (hold_stcb_lock == 0) {
6427                 SCTP_TCB_SEND_UNLOCK(stcb);
6428         }
6429 out_now:
6430         if (m) {
6431                 sctp_m_freem(m);
6432         }
6433         return (error);
6434 }
6435
6436
6437 static struct mbuf *
6438 sctp_copy_mbufchain(struct mbuf *clonechain,
6439     struct mbuf *outchain,
6440     struct mbuf **endofchain,
6441     int can_take_mbuf,
6442     int sizeofcpy,
6443     uint8_t copy_by_ref)
6444 {
6445         struct mbuf *m;
6446         struct mbuf *appendchain;
6447         caddr_t cp;
6448         int len;
6449
6450         if (endofchain == NULL) {
6451                 /* error */
6452 error_out:
6453                 if (outchain)
6454                         sctp_m_freem(outchain);
6455                 return (NULL);
6456         }
6457         if (can_take_mbuf) {
6458                 appendchain = clonechain;
6459         } else {
6460                 if (!copy_by_ref &&
6461                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6462                     ) {
6463                         /* Its not in a cluster */
6464                         if (*endofchain == NULL) {
6465                                 /* lets get a mbuf cluster */
6466                                 if (outchain == NULL) {
6467                                         /* This is the general case */
6468                         new_mbuf:
6469                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6470                                         if (outchain == NULL) {
6471                                                 goto error_out;
6472                                         }
6473                                         SCTP_BUF_LEN(outchain) = 0;
6474                                         *endofchain = outchain;
6475                                         /* get the prepend space */
6476                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6477                                 } else {
6478                                         /*
6479                                          * We really should not get a NULL
6480                                          * in endofchain
6481                                          */
6482                                         /* find end */
6483                                         m = outchain;
6484                                         while (m) {
6485                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6486                                                         *endofchain = m;
6487                                                         break;
6488                                                 }
6489                                                 m = SCTP_BUF_NEXT(m);
6490                                         }
6491                                         /* sanity */
6492                                         if (*endofchain == NULL) {
6493                                                 /*
6494                                                  * huh, TSNH XXX maybe we
6495                                                  * should panic
6496                                                  */
6497                                                 sctp_m_freem(outchain);
6498                                                 goto new_mbuf;
6499                                         }
6500                                 }
6501                                 /* get the new end of length */
6502                                 len = (int)M_TRAILINGSPACE(*endofchain);
6503                         } else {
6504                                 /* how much is left at the end? */
6505                                 len = (int)M_TRAILINGSPACE(*endofchain);
6506                         }
6507                         /* Find the end of the data, for appending */
6508                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6509
6510                         /* Now lets copy it out */
6511                         if (len >= sizeofcpy) {
6512                                 /* It all fits, copy it in */
6513                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6514                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6515                         } else {
6516                                 /* fill up the end of the chain */
6517                                 if (len > 0) {
6518                                         m_copydata(clonechain, 0, len, cp);
6519                                         SCTP_BUF_LEN((*endofchain)) += len;
6520                                         /* now we need another one */
6521                                         sizeofcpy -= len;
6522                                 }
6523                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6524                                 if (m == NULL) {
6525                                         /* We failed */
6526                                         goto error_out;
6527                                 }
6528                                 SCTP_BUF_NEXT((*endofchain)) = m;
6529                                 *endofchain = m;
6530                                 cp = mtod((*endofchain), caddr_t);
6531                                 m_copydata(clonechain, len, sizeofcpy, cp);
6532                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6533                         }
6534                         return (outchain);
6535                 } else {
6536                         /* copy the old fashion way */
6537                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6538 #ifdef SCTP_MBUF_LOGGING
6539                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6540                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6541                         }
6542 #endif
6543                 }
6544         }
6545         if (appendchain == NULL) {
6546                 /* error */
6547                 if (outchain)
6548                         sctp_m_freem(outchain);
6549                 return (NULL);
6550         }
6551         if (outchain) {
6552                 /* tack on to the end */
6553                 if (*endofchain != NULL) {
6554                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6555                 } else {
6556                         m = outchain;
6557                         while (m) {
6558                                 if (SCTP_BUF_NEXT(m) == NULL) {
6559                                         SCTP_BUF_NEXT(m) = appendchain;
6560                                         break;
6561                                 }
6562                                 m = SCTP_BUF_NEXT(m);
6563                         }
6564                 }
6565                 /*
6566                  * save off the end and update the end-chain position
6567                  */
6568                 m = appendchain;
6569                 while (m) {
6570                         if (SCTP_BUF_NEXT(m) == NULL) {
6571                                 *endofchain = m;
6572                                 break;
6573                         }
6574                         m = SCTP_BUF_NEXT(m);
6575                 }
6576                 return (outchain);
6577         } else {
6578                 /* save off the end and update the end-chain position */
6579                 m = appendchain;
6580                 while (m) {
6581                         if (SCTP_BUF_NEXT(m) == NULL) {
6582                                 *endofchain = m;
6583                                 break;
6584                         }
6585                         m = SCTP_BUF_NEXT(m);
6586                 }
6587                 return (appendchain);
6588         }
6589 }
6590
6591 static int
6592 sctp_med_chunk_output(struct sctp_inpcb *inp,
6593     struct sctp_tcb *stcb,
6594     struct sctp_association *asoc,
6595     int *num_out,
6596     int *reason_code,
6597     int control_only, int from_where,
6598     struct timeval *now, int *now_filled, int frag_point, int so_locked
6599 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6600     SCTP_UNUSED
6601 #endif
6602 );
6603
6604 static void
6605 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6606     uint32_t val SCTP_UNUSED)
6607 {
6608         struct sctp_copy_all *ca;
6609         struct mbuf *m;
6610         int ret = 0;
6611         int added_control = 0;
6612         int un_sent, do_chunk_output = 1;
6613         struct sctp_association *asoc;
6614         struct sctp_nets *net;
6615
6616         ca = (struct sctp_copy_all *)ptr;
6617         if (ca->m == NULL) {
6618                 return;
6619         }
6620         if (ca->inp != inp) {
6621                 /* TSNH */
6622                 return;
6623         }
6624         if (ca->sndlen > 0) {
6625                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6626                 if (m == NULL) {
6627                         /* can't copy so we are done */
6628                         ca->cnt_failed++;
6629                         return;
6630                 }
6631 #ifdef SCTP_MBUF_LOGGING
6632                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6633                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6634                 }
6635 #endif
6636         } else {
6637                 m = NULL;
6638         }
6639         SCTP_TCB_LOCK_ASSERT(stcb);
6640         if (stcb->asoc.alternate) {
6641                 net = stcb->asoc.alternate;
6642         } else {
6643                 net = stcb->asoc.primary_destination;
6644         }
6645         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6646                 /* Abort this assoc with m as the user defined reason */
6647                 if (m != NULL) {
6648                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6649                 } else {
6650                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6651                             0, M_NOWAIT, 1, MT_DATA);
6652                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6653                 }
6654                 if (m != NULL) {
6655                         struct sctp_paramhdr *ph;
6656
6657                         ph = mtod(m, struct sctp_paramhdr *);
6658                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6659                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6660                 }
6661                 /*
6662                  * We add one here to keep the assoc from dis-appearing on
6663                  * us.
6664                  */
6665                 atomic_add_int(&stcb->asoc.refcnt, 1);
6666                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6667                 /*
6668                  * sctp_abort_an_association calls sctp_free_asoc() free
6669                  * association will NOT free it since we incremented the
6670                  * refcnt .. we do this to prevent it being freed and things
6671                  * getting tricky since we could end up (from free_asoc)
6672                  * calling inpcb_free which would get a recursive lock call
6673                  * to the iterator lock.. But as a consequence of that the
6674                  * stcb will return to us un-locked.. since free_asoc
6675                  * returns with either no TCB or the TCB unlocked, we must
6676                  * relock.. to unlock in the iterator timer :-0
6677                  */
6678                 SCTP_TCB_LOCK(stcb);
6679                 atomic_add_int(&stcb->asoc.refcnt, -1);
6680                 goto no_chunk_output;
6681         } else {
6682                 if (m) {
6683                         ret = sctp_msg_append(stcb, net, m,
6684                             &ca->sndrcv, 1);
6685                 }
6686                 asoc = &stcb->asoc;
6687                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6688                         /* shutdown this assoc */
6689                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6690                             TAILQ_EMPTY(&asoc->sent_queue) &&
6691                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6692                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6693                                         goto abort_anyway;
6694                                 }
6695                                 /*
6696                                  * there is nothing queued to send, so I'm
6697                                  * done...
6698                                  */
6699                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6700                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6701                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6702                                         /*
6703                                          * only send SHUTDOWN the first time
6704                                          * through
6705                                          */
6706                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6707                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6708                                         }
6709                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6710                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6711                                         sctp_stop_timers_for_shutdown(stcb);
6712                                         sctp_send_shutdown(stcb, net);
6713                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6714                                             net);
6715                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6716                                             asoc->primary_destination);
6717                                         added_control = 1;
6718                                         do_chunk_output = 0;
6719                                 }
6720                         } else {
6721                                 /*
6722                                  * we still got (or just got) data to send,
6723                                  * so set SHUTDOWN_PENDING
6724                                  */
6725                                 /*
6726                                  * XXX sockets draft says that SCTP_EOF
6727                                  * should be sent with no data.  currently,
6728                                  * we will allow user data to be sent first
6729                                  * and move to SHUTDOWN-PENDING
6730                                  */
6731                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6732                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6733                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6734                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6735                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6736                                         }
6737                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6738                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6739                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6740                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6741                                                 struct mbuf *op_err;
6742                                                 char msg[SCTP_DIAG_INFO_LEN];
6743
6744                                 abort_anyway:
6745                                                 snprintf(msg, sizeof(msg),
6746                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6747                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6748                                                     msg);
6749                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6750                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6751                                                     op_err, SCTP_SO_NOT_LOCKED);
6752                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6753                                                 goto no_chunk_output;
6754                                         }
6755                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6756                                             asoc->primary_destination);
6757                                 }
6758                         }
6759
6760                 }
6761         }
6762         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6763             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6764
6765         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6766             (stcb->asoc.total_flight > 0) &&
6767             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6768                 do_chunk_output = 0;
6769         }
6770         if (do_chunk_output)
6771                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6772         else if (added_control) {
6773                 int num_out, reason, now_filled = 0;
6774                 struct timeval now;
6775                 int frag_point;
6776
6777                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6778                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6779                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6780         }
6781 no_chunk_output:
6782         if (ret) {
6783                 ca->cnt_failed++;
6784         } else {
6785                 ca->cnt_sent++;
6786         }
6787 }
6788
6789 static void
6790 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6791 {
6792         struct sctp_copy_all *ca;
6793
6794         ca = (struct sctp_copy_all *)ptr;
6795         /*
6796          * Do a notify here? Kacheong suggests that the notify be done at
6797          * the send time.. so you would push up a notification if any send
6798          * failed. Don't know if this is feasible since the only failures we
6799          * have is "memory" related and if you cannot get an mbuf to send
6800          * the data you surely can't get an mbuf to send up to notify the
6801          * user you can't send the data :->
6802          */
6803
6804         /* now free everything */
6805         sctp_m_freem(ca->m);
6806         SCTP_FREE(ca, SCTP_M_COPYAL);
6807 }
6808
6809 static struct mbuf *
6810 sctp_copy_out_all(struct uio *uio, int len)
6811 {
6812         struct mbuf *ret, *at;
6813         int left, willcpy, cancpy, error;
6814
6815         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6816         if (ret == NULL) {
6817                 /* TSNH */
6818                 return (NULL);
6819         }
6820         left = len;
6821         SCTP_BUF_LEN(ret) = 0;
6822         /* save space for the data chunk header */
6823         cancpy = (int)M_TRAILINGSPACE(ret);
6824         willcpy = min(cancpy, left);
6825         at = ret;
6826         while (left > 0) {
6827                 /* Align data to the end */
6828                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6829                 if (error) {
6830         err_out_now:
6831                         sctp_m_freem(at);
6832                         return (NULL);
6833                 }
6834                 SCTP_BUF_LEN(at) = willcpy;
6835                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6836                 left -= willcpy;
6837                 if (left > 0) {
6838                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6839                         if (SCTP_BUF_NEXT(at) == NULL) {
6840                                 goto err_out_now;
6841                         }
6842                         at = SCTP_BUF_NEXT(at);
6843                         SCTP_BUF_LEN(at) = 0;
6844                         cancpy = (int)M_TRAILINGSPACE(at);
6845                         willcpy = min(cancpy, left);
6846                 }
6847         }
6848         return (ret);
6849 }
6850
6851 static int
6852 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6853     struct sctp_sndrcvinfo *srcv)
6854 {
6855         int ret;
6856         struct sctp_copy_all *ca;
6857
6858         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6859             SCTP_M_COPYAL);
6860         if (ca == NULL) {
6861                 sctp_m_freem(m);
6862                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6863                 return (ENOMEM);
6864         }
6865         memset(ca, 0, sizeof(struct sctp_copy_all));
6866
6867         ca->inp = inp;
6868         if (srcv) {
6869                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6870         }
6871         /*
6872          * take off the sendall flag, it would be bad if we failed to do
6873          * this :-0
6874          */
6875         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6876         /* get length and mbuf chain */
6877         if (uio) {
6878                 ca->sndlen = (int)uio->uio_resid;
6879                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6880                 if (ca->m == NULL) {
6881                         SCTP_FREE(ca, SCTP_M_COPYAL);
6882                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6883                         return (ENOMEM);
6884                 }
6885         } else {
6886                 /* Gather the length of the send */
6887                 struct mbuf *mat;
6888
6889                 ca->sndlen = 0;
6890                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6891                         ca->sndlen += SCTP_BUF_LEN(mat);
6892                 }
6893         }
6894         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6895             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6896             SCTP_ASOC_ANY_STATE,
6897             (void *)ca, 0,
6898             sctp_sendall_completes, inp, 1);
6899         if (ret) {
6900                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6901                 SCTP_FREE(ca, SCTP_M_COPYAL);
6902                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6903                 return (EFAULT);
6904         }
6905         return (0);
6906 }
6907
6908
6909 void
6910 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6911 {
6912         struct sctp_tmit_chunk *chk, *nchk;
6913
6914         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6915                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6916                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6917                         asoc->ctrl_queue_cnt--;
6918                         if (chk->data) {
6919                                 sctp_m_freem(chk->data);
6920                                 chk->data = NULL;
6921                         }
6922                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6923                 }
6924         }
6925 }
6926
6927 void
6928 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6929 {
6930         struct sctp_association *asoc;
6931         struct sctp_tmit_chunk *chk, *nchk;
6932         struct sctp_asconf_chunk *acp;
6933
6934         asoc = &stcb->asoc;
6935         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6936                 /* find SCTP_ASCONF chunk in queue */
6937                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6938                         if (chk->data) {
6939                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6940                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6941                                         /* Not Acked yet */
6942                                         break;
6943                                 }
6944                         }
6945                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6946                         asoc->ctrl_queue_cnt--;
6947                         if (chk->data) {
6948                                 sctp_m_freem(chk->data);
6949                                 chk->data = NULL;
6950                         }
6951                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6952                 }
6953         }
6954 }
6955
6956
6957 static void
6958 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6959     struct sctp_association *asoc,
6960     struct sctp_tmit_chunk **data_list,
6961     int bundle_at,
6962     struct sctp_nets *net)
6963 {
6964         int i;
6965         struct sctp_tmit_chunk *tp1;
6966
6967         for (i = 0; i < bundle_at; i++) {
6968                 /* off of the send queue */
6969                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6970                 asoc->send_queue_cnt--;
6971                 if (i > 0) {
6972                         /*
6973                          * Any chunk NOT 0 you zap the time chunk 0 gets
6974                          * zapped or set based on if a RTO measurment is
6975                          * needed.
6976                          */
6977                         data_list[i]->do_rtt = 0;
6978                 }
6979                 /* record time */
6980                 data_list[i]->sent_rcv_time = net->last_sent_time;
6981                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6982                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6983                 if (data_list[i]->whoTo == NULL) {
6984                         data_list[i]->whoTo = net;
6985                         atomic_add_int(&net->ref_count, 1);
6986                 }
6987                 /* on to the sent queue */
6988                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6989                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6990                         struct sctp_tmit_chunk *tpp;
6991
6992                         /* need to move back */
6993         back_up_more:
6994                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6995                         if (tpp == NULL) {
6996                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6997                                 goto all_done;
6998                         }
6999                         tp1 = tpp;
7000                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7001                                 goto back_up_more;
7002                         }
7003                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7004                 } else {
7005                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7006                             data_list[i],
7007                             sctp_next);
7008                 }
7009 all_done:
7010                 /* This does not lower until the cum-ack passes it */
7011                 asoc->sent_queue_cnt++;
7012                 if ((asoc->peers_rwnd <= 0) &&
7013                     (asoc->total_flight == 0) &&
7014                     (bundle_at == 1)) {
7015                         /* Mark the chunk as being a window probe */
7016                         SCTP_STAT_INCR(sctps_windowprobed);
7017                 }
7018 #ifdef SCTP_AUDITING_ENABLED
7019                 sctp_audit_log(0xC2, 3);
7020 #endif
7021                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7022                 data_list[i]->snd_count = 1;
7023                 data_list[i]->rec.data.chunk_was_revoked = 0;
7024                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7025                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7026                             data_list[i]->whoTo->flight_size,
7027                             data_list[i]->book_size,
7028                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7029                             data_list[i]->rec.data.tsn);
7030                 }
7031                 sctp_flight_size_increase(data_list[i]);
7032                 sctp_total_flight_increase(stcb, data_list[i]);
7033                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7034                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7035                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7036                 }
7037                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7038                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7039                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7040                         /* SWS sender side engages */
7041                         asoc->peers_rwnd = 0;
7042                 }
7043         }
7044         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7045                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7046         }
7047 }
7048
7049 static void
7050 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7051 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7052     SCTP_UNUSED
7053 #endif
7054 )
7055 {
7056         struct sctp_tmit_chunk *chk, *nchk;
7057
7058         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7059                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7060                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7061                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7062                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7063                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7064                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7065                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7066                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7067                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7068                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7069                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7070                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7071                         /* Stray chunks must be cleaned up */
7072         clean_up_anyway:
7073                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7074                         asoc->ctrl_queue_cnt--;
7075                         if (chk->data) {
7076                                 sctp_m_freem(chk->data);
7077                                 chk->data = NULL;
7078                         }
7079                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7080                                 asoc->fwd_tsn_cnt--;
7081                         }
7082                         sctp_free_a_chunk(stcb, chk, so_locked);
7083                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7084                         /* special handling, we must look into the param */
7085                         if (chk != asoc->str_reset) {
7086                                 goto clean_up_anyway;
7087                         }
7088                 }
7089         }
7090 }
7091
7092 static uint32_t
7093 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7094     uint32_t space_left, uint32_t frag_point, int eeor_on)
7095 {
7096         /*
7097          * Make a decision on if I should split a msg into multiple parts.
7098          * This is only asked of incomplete messages.
7099          */
7100         if (eeor_on) {
7101                 /*
7102                  * If we are doing EEOR we need to always send it if its the
7103                  * entire thing, since it might be all the guy is putting in
7104                  * the hopper.
7105                  */
7106                 if (space_left >= length) {
7107                         /*-
7108                          * If we have data outstanding,
7109                          * we get another chance when the sack
7110                          * arrives to transmit - wait for more data
7111                          */
7112                         if (stcb->asoc.total_flight == 0) {
7113                                 /*
7114                                  * If nothing is in flight, we zero the
7115                                  * packet counter.
7116                                  */
7117                                 return (length);
7118                         }
7119                         return (0);
7120
7121                 } else {
7122                         /* You can fill the rest */
7123                         return (space_left);
7124                 }
7125         }
7126         /*-
7127          * For those strange folk that make the send buffer
7128          * smaller than our fragmentation point, we can't
7129          * get a full msg in so we have to allow splitting.
7130          */
7131         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7132                 return (length);
7133         }
7134         if ((length <= space_left) ||
7135             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7136                 /* Sub-optimial residual don't split in non-eeor mode. */
7137                 return (0);
7138         }
7139         /*
7140          * If we reach here length is larger than the space_left. Do we wish
7141          * to split it for the sake of packet putting together?
7142          */
7143         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7144                 /* Its ok to split it */
7145                 return (min(space_left, frag_point));
7146         }
7147         /* Nope, can't split */
7148         return (0);
7149 }
7150
7151 static uint32_t
7152 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7153     struct sctp_stream_out *strq,
7154     uint32_t space_left,
7155     uint32_t frag_point,
7156     int *giveup,
7157     int eeor_mode,
7158     int *bail,
7159     int so_locked
7160 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7161     SCTP_UNUSED
7162 #endif
7163 )
7164 {
7165         /* Move from the stream to the send_queue keeping track of the total */
7166         struct sctp_association *asoc;
7167         struct sctp_stream_queue_pending *sp;
7168         struct sctp_tmit_chunk *chk;
7169         struct sctp_data_chunk *dchkh = NULL;
7170         struct sctp_idata_chunk *ndchkh = NULL;
7171         uint32_t to_move, length;
7172         int leading;
7173         uint8_t rcv_flags = 0;
7174         uint8_t some_taken;
7175         uint8_t send_lock_up = 0;
7176
7177         SCTP_TCB_LOCK_ASSERT(stcb);
7178         asoc = &stcb->asoc;
7179 one_more_time:
7180         /* sa_ignore FREED_MEMORY */
7181         sp = TAILQ_FIRST(&strq->outqueue);
7182         if (sp == NULL) {
7183                 if (send_lock_up == 0) {
7184                         SCTP_TCB_SEND_LOCK(stcb);
7185                         send_lock_up = 1;
7186                 }
7187                 sp = TAILQ_FIRST(&strq->outqueue);
7188                 if (sp) {
7189                         goto one_more_time;
7190                 }
7191                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7192                     (stcb->asoc.idata_supported == 0) &&
7193                     (strq->last_msg_incomplete)) {
7194                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7195                             strq->sid,
7196                             strq->last_msg_incomplete);
7197                         strq->last_msg_incomplete = 0;
7198                 }
7199                 to_move = 0;
7200                 if (send_lock_up) {
7201                         SCTP_TCB_SEND_UNLOCK(stcb);
7202                         send_lock_up = 0;
7203                 }
7204                 goto out_of;
7205         }
7206         if ((sp->msg_is_complete) && (sp->length == 0)) {
7207                 if (sp->sender_all_done) {
7208                         /*
7209                          * We are doing differed cleanup. Last time through
7210                          * when we took all the data the sender_all_done was
7211                          * not set.
7212                          */
7213                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7214                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7215                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7216                                     sp->sender_all_done,
7217                                     sp->length,
7218                                     sp->msg_is_complete,
7219                                     sp->put_last_out,
7220                                     send_lock_up);
7221                         }
7222                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7223                                 SCTP_TCB_SEND_LOCK(stcb);
7224                                 send_lock_up = 1;
7225                         }
7226                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7227                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7228                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7229                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7230                             (strq->chunks_on_queues == 0) &&
7231                             TAILQ_EMPTY(&strq->outqueue)) {
7232                                 stcb->asoc.trigger_reset = 1;
7233                         }
7234                         if (sp->net) {
7235                                 sctp_free_remote_addr(sp->net);
7236                                 sp->net = NULL;
7237                         }
7238                         if (sp->data) {
7239                                 sctp_m_freem(sp->data);
7240                                 sp->data = NULL;
7241                         }
7242                         sctp_free_a_strmoq(stcb, sp, so_locked);
7243                         /* we can't be locked to it */
7244                         if (send_lock_up) {
7245                                 SCTP_TCB_SEND_UNLOCK(stcb);
7246                                 send_lock_up = 0;
7247                         }
7248                         /* back to get the next msg */
7249                         goto one_more_time;
7250                 } else {
7251                         /*
7252                          * sender just finished this but still holds a
7253                          * reference
7254                          */
7255                         *giveup = 1;
7256                         to_move = 0;
7257                         goto out_of;
7258                 }
7259         } else {
7260                 /* is there some to get */
7261                 if (sp->length == 0) {
7262                         /* no */
7263                         *giveup = 1;
7264                         to_move = 0;
7265                         goto out_of;
7266                 } else if (sp->discard_rest) {
7267                         if (send_lock_up == 0) {
7268                                 SCTP_TCB_SEND_LOCK(stcb);
7269                                 send_lock_up = 1;
7270                         }
7271                         /* Whack down the size */
7272                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7273                         if ((stcb->sctp_socket != NULL) &&
7274                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7275                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7276                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7277                         }
7278                         if (sp->data) {
7279                                 sctp_m_freem(sp->data);
7280                                 sp->data = NULL;
7281                                 sp->tail_mbuf = NULL;
7282                         }
7283                         sp->length = 0;
7284                         sp->some_taken = 1;
7285                         *giveup = 1;
7286                         to_move = 0;
7287                         goto out_of;
7288                 }
7289         }
7290         some_taken = sp->some_taken;
7291 re_look:
7292         length = sp->length;
7293         if (sp->msg_is_complete) {
7294                 /* The message is complete */
7295                 to_move = min(length, frag_point);
7296                 if (to_move == length) {
7297                         /* All of it fits in the MTU */
7298                         if (sp->some_taken) {
7299                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7300                         } else {
7301                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7302                         }
7303                         sp->put_last_out = 1;
7304                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7305                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7306                         }
7307                 } else {
7308                         /* Not all of it fits, we fragment */
7309                         if (sp->some_taken == 0) {
7310                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7311                         }
7312                         sp->some_taken = 1;
7313                 }
7314         } else {
7315                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7316                 if (to_move) {
7317                         /*-
7318                          * We use a snapshot of length in case it
7319                          * is expanding during the compare.
7320                          */
7321                         uint32_t llen;
7322
7323                         llen = length;
7324                         if (to_move >= llen) {
7325                                 to_move = llen;
7326                                 if (send_lock_up == 0) {
7327                                         /*-
7328                                          * We are taking all of an incomplete msg
7329                                          * thus we need a send lock.
7330                                          */
7331                                         SCTP_TCB_SEND_LOCK(stcb);
7332                                         send_lock_up = 1;
7333                                         if (sp->msg_is_complete) {
7334                                                 /*
7335                                                  * the sender finished the
7336                                                  * msg
7337                                                  */
7338                                                 goto re_look;
7339                                         }
7340                                 }
7341                         }
7342                         if (sp->some_taken == 0) {
7343                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7344                                 sp->some_taken = 1;
7345                         }
7346                 } else {
7347                         /* Nothing to take. */
7348                         *giveup = 1;
7349                         to_move = 0;
7350                         goto out_of;
7351                 }
7352         }
7353
7354         /* If we reach here, we can copy out a chunk */
7355         sctp_alloc_a_chunk(stcb, chk);
7356         if (chk == NULL) {
7357                 /* No chunk memory */
7358                 *giveup = 1;
7359                 to_move = 0;
7360                 goto out_of;
7361         }
7362         /*
7363          * Setup for unordered if needed by looking at the user sent info
7364          * flags.
7365          */
7366         if (sp->sinfo_flags & SCTP_UNORDERED) {
7367                 rcv_flags |= SCTP_DATA_UNORDERED;
7368         }
7369         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7370             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7371                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7372         }
7373         /* clear out the chunk before setting up */
7374         memset(chk, 0, sizeof(*chk));
7375         chk->rec.data.rcv_flags = rcv_flags;
7376
7377         if (to_move >= length) {
7378                 /* we think we can steal the whole thing */
7379                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7380                         SCTP_TCB_SEND_LOCK(stcb);
7381                         send_lock_up = 1;
7382                 }
7383                 if (to_move < sp->length) {
7384                         /* bail, it changed */
7385                         goto dont_do_it;
7386                 }
7387                 chk->data = sp->data;
7388                 chk->last_mbuf = sp->tail_mbuf;
7389                 /* register the stealing */
7390                 sp->data = sp->tail_mbuf = NULL;
7391         } else {
7392                 struct mbuf *m;
7393
7394 dont_do_it:
7395                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7396                 chk->last_mbuf = NULL;
7397                 if (chk->data == NULL) {
7398                         sp->some_taken = some_taken;
7399                         sctp_free_a_chunk(stcb, chk, so_locked);
7400                         *bail = 1;
7401                         to_move = 0;
7402                         goto out_of;
7403                 }
7404 #ifdef SCTP_MBUF_LOGGING
7405                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7406                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7407                 }
7408 #endif
7409                 /* Pull off the data */
7410                 m_adj(sp->data, to_move);
7411                 /* Now lets work our way down and compact it */
7412                 m = sp->data;
7413                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7414                         sp->data = SCTP_BUF_NEXT(m);
7415                         SCTP_BUF_NEXT(m) = NULL;
7416                         if (sp->tail_mbuf == m) {
7417                                 /*-
7418                                  * Freeing tail? TSNH since
7419                                  * we supposedly were taking less
7420                                  * than the sp->length.
7421                                  */
7422 #ifdef INVARIANTS
7423                                 panic("Huh, freing tail? - TSNH");
7424 #else
7425                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7426                                 sp->tail_mbuf = sp->data = NULL;
7427                                 sp->length = 0;
7428 #endif
7429
7430                         }
7431                         sctp_m_free(m);
7432                         m = sp->data;
7433                 }
7434         }
7435         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7436                 chk->copy_by_ref = 1;
7437         } else {
7438                 chk->copy_by_ref = 0;
7439         }
7440         /*
7441          * get last_mbuf and counts of mb usage This is ugly but hopefully
7442          * its only one mbuf.
7443          */
7444         if (chk->last_mbuf == NULL) {
7445                 chk->last_mbuf = chk->data;
7446                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7447                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7448                 }
7449         }
7450
7451         if (to_move > length) {
7452                 /*- This should not happen either
7453                  * since we always lower to_move to the size
7454                  * of sp->length if its larger.
7455                  */
7456 #ifdef INVARIANTS
7457                 panic("Huh, how can to_move be larger?");
7458 #else
7459                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7460                 sp->length = 0;
7461 #endif
7462         } else {
7463                 atomic_subtract_int(&sp->length, to_move);
7464         }
7465         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7466         if (M_LEADINGSPACE(chk->data) < leading) {
7467                 /* Not enough room for a chunk header, get some */
7468                 struct mbuf *m;
7469
7470                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7471                 if (m == NULL) {
7472                         /*
7473                          * we're in trouble here. _PREPEND below will free
7474                          * all the data if there is no leading space, so we
7475                          * must put the data back and restore.
7476                          */
7477                         if (send_lock_up == 0) {
7478                                 SCTP_TCB_SEND_LOCK(stcb);
7479                                 send_lock_up = 1;
7480                         }
7481                         if (sp->data == NULL) {
7482                                 /* unsteal the data */
7483                                 sp->data = chk->data;
7484                                 sp->tail_mbuf = chk->last_mbuf;
7485                         } else {
7486                                 struct mbuf *m_tmp;
7487
7488                                 /* reassemble the data */
7489                                 m_tmp = sp->data;
7490                                 sp->data = chk->data;
7491                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7492                         }
7493                         sp->some_taken = some_taken;
7494                         atomic_add_int(&sp->length, to_move);
7495                         chk->data = NULL;
7496                         *bail = 1;
7497                         sctp_free_a_chunk(stcb, chk, so_locked);
7498                         to_move = 0;
7499                         goto out_of;
7500                 } else {
7501                         SCTP_BUF_LEN(m) = 0;
7502                         SCTP_BUF_NEXT(m) = chk->data;
7503                         chk->data = m;
7504                         M_ALIGN(chk->data, 4);
7505                 }
7506         }
7507         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7508         if (chk->data == NULL) {
7509                 /* HELP, TSNH since we assured it would not above? */
7510 #ifdef INVARIANTS
7511                 panic("prepend failes HELP?");
7512 #else
7513                 SCTP_PRINTF("prepend fails HELP?\n");
7514                 sctp_free_a_chunk(stcb, chk, so_locked);
7515 #endif
7516                 *bail = 1;
7517                 to_move = 0;
7518                 goto out_of;
7519         }
7520         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7521         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7522         chk->book_size_scale = 0;
7523         chk->sent = SCTP_DATAGRAM_UNSENT;
7524
7525         chk->flags = 0;
7526         chk->asoc = &stcb->asoc;
7527         chk->pad_inplace = 0;
7528         chk->no_fr_allowed = 0;
7529         if (stcb->asoc.idata_supported == 0) {
7530                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7531                         /* Just use 0. The receiver ignores the values. */
7532                         chk->rec.data.mid = 0;
7533                 } else {
7534                         chk->rec.data.mid = strq->next_mid_ordered;
7535                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7536                                 strq->next_mid_ordered++;
7537                         }
7538                 }
7539         } else {
7540                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7541                         chk->rec.data.mid = strq->next_mid_unordered;
7542                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7543                                 strq->next_mid_unordered++;
7544                         }
7545                 } else {
7546                         chk->rec.data.mid = strq->next_mid_ordered;
7547                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7548                                 strq->next_mid_ordered++;
7549                         }
7550                 }
7551         }
7552         chk->rec.data.sid = sp->sid;
7553         chk->rec.data.ppid = sp->ppid;
7554         chk->rec.data.context = sp->context;
7555         chk->rec.data.doing_fast_retransmit = 0;
7556
7557         chk->rec.data.timetodrop = sp->ts;
7558         chk->flags = sp->act_flags;
7559
7560         if (sp->net) {
7561                 chk->whoTo = sp->net;
7562                 atomic_add_int(&chk->whoTo->ref_count, 1);
7563         } else
7564                 chk->whoTo = NULL;
7565
7566         if (sp->holds_key_ref) {
7567                 chk->auth_keyid = sp->auth_keyid;
7568                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7569                 chk->holds_key_ref = 1;
7570         }
7571         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7572         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7573                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7574                     (uint32_t)(uintptr_t)stcb, sp->length,
7575                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7576                     chk->rec.data.tsn);
7577         }
7578         if (stcb->asoc.idata_supported == 0) {
7579                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7580         } else {
7581                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7582         }
7583         /*
7584          * Put the rest of the things in place now. Size was done earlier in
7585          * previous loop prior to padding.
7586          */
7587
7588 #ifdef SCTP_ASOCLOG_OF_TSNS
7589         SCTP_TCB_LOCK_ASSERT(stcb);
7590         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7591                 asoc->tsn_out_at = 0;
7592                 asoc->tsn_out_wrapped = 1;
7593         }
7594         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7595         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7596         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7597         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7598         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7599         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7600         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7601         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7602         asoc->tsn_out_at++;
7603 #endif
7604         if (stcb->asoc.idata_supported == 0) {
7605                 dchkh->ch.chunk_type = SCTP_DATA;
7606                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7607                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7608                 dchkh->dp.sid = htons(strq->sid);
7609                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7610                 dchkh->dp.ppid = chk->rec.data.ppid;
7611                 dchkh->ch.chunk_length = htons(chk->send_size);
7612         } else {
7613                 ndchkh->ch.chunk_type = SCTP_IDATA;
7614                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7615                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7616                 ndchkh->dp.sid = htons(strq->sid);
7617                 ndchkh->dp.reserved = htons(0);
7618                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7619                 if (sp->fsn == 0)
7620                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7621                 else
7622                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7623                 sp->fsn++;
7624                 ndchkh->ch.chunk_length = htons(chk->send_size);
7625         }
7626         /* Now advance the chk->send_size by the actual pad needed. */
7627         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7628                 /* need a pad */
7629                 struct mbuf *lm;
7630                 int pads;
7631
7632                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7633                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7634                 if (lm != NULL) {
7635                         chk->last_mbuf = lm;
7636                         chk->pad_inplace = 1;
7637                 }
7638                 chk->send_size += pads;
7639         }
7640         if (PR_SCTP_ENABLED(chk->flags)) {
7641                 asoc->pr_sctp_cnt++;
7642         }
7643         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7644                 /* All done pull and kill the message */
7645                 if (sp->put_last_out == 0) {
7646                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7647                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7648                             sp->sender_all_done,
7649                             sp->length,
7650                             sp->msg_is_complete,
7651                             sp->put_last_out,
7652                             send_lock_up);
7653                 }
7654                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7655                         SCTP_TCB_SEND_LOCK(stcb);
7656                         send_lock_up = 1;
7657                 }
7658                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7659                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7660                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7661                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7662                     (strq->chunks_on_queues == 0) &&
7663                     TAILQ_EMPTY(&strq->outqueue)) {
7664                         stcb->asoc.trigger_reset = 1;
7665                 }
7666                 if (sp->net) {
7667                         sctp_free_remote_addr(sp->net);
7668                         sp->net = NULL;
7669                 }
7670                 if (sp->data) {
7671                         sctp_m_freem(sp->data);
7672                         sp->data = NULL;
7673                 }
7674                 sctp_free_a_strmoq(stcb, sp, so_locked);
7675         }
7676         asoc->chunks_on_out_queue++;
7677         strq->chunks_on_queues++;
7678         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7679         asoc->send_queue_cnt++;
7680 out_of:
7681         if (send_lock_up) {
7682                 SCTP_TCB_SEND_UNLOCK(stcb);
7683         }
7684         return (to_move);
7685 }
7686
7687
7688 static void
7689 sctp_fill_outqueue(struct sctp_tcb *stcb,
7690     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7691 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7692     SCTP_UNUSED
7693 #endif
7694 )
7695 {
7696         struct sctp_association *asoc;
7697         struct sctp_stream_out *strq;
7698         uint32_t space_left, moved, total_moved;
7699         int bail, giveup;
7700
7701         SCTP_TCB_LOCK_ASSERT(stcb);
7702         asoc = &stcb->asoc;
7703         total_moved = 0;
7704         switch (net->ro._l_addr.sa.sa_family) {
7705 #ifdef INET
7706         case AF_INET:
7707                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7708                 break;
7709 #endif
7710 #ifdef INET6
7711         case AF_INET6:
7712                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7713                 break;
7714 #endif
7715         default:
7716                 /* TSNH */
7717                 space_left = net->mtu;
7718                 break;
7719         }
7720         /* Need an allowance for the data chunk header too */
7721         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7722
7723         /* must make even word boundary */
7724         space_left &= 0xfffffffc;
7725         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7726         giveup = 0;
7727         bail = 0;
7728         while ((space_left > 0) && (strq != NULL)) {
7729                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7730                     &giveup, eeor_mode, &bail, so_locked);
7731                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7732                 if ((giveup != 0) || (bail != 0)) {
7733                         break;
7734                 }
7735                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7736                 total_moved += moved;
7737                 space_left -= moved;
7738                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7739                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7740                 } else {
7741                         space_left = 0;
7742                 }
7743                 space_left &= 0xfffffffc;
7744         }
7745         if (bail != 0)
7746                 *quit_now = 1;
7747
7748         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7749
7750         if (total_moved == 0) {
7751                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7752                     (net == stcb->asoc.primary_destination)) {
7753                         /* ran dry for primary network net */
7754                         SCTP_STAT_INCR(sctps_primary_randry);
7755                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7756                         /* ran dry with CMT on */
7757                         SCTP_STAT_INCR(sctps_cmt_randry);
7758                 }
7759         }
7760 }
7761
7762 void
7763 sctp_fix_ecn_echo(struct sctp_association *asoc)
7764 {
7765         struct sctp_tmit_chunk *chk;
7766
7767         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7768                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7769                         chk->sent = SCTP_DATAGRAM_UNSENT;
7770                 }
7771         }
7772 }
7773
7774 void
7775 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7776 {
7777         struct sctp_association *asoc;
7778         struct sctp_tmit_chunk *chk;
7779         struct sctp_stream_queue_pending *sp;
7780         unsigned int i;
7781
7782         if (net == NULL) {
7783                 return;
7784         }
7785         asoc = &stcb->asoc;
7786         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7787                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7788                         if (sp->net == net) {
7789                                 sctp_free_remote_addr(sp->net);
7790                                 sp->net = NULL;
7791                         }
7792                 }
7793         }
7794         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7795                 if (chk->whoTo == net) {
7796                         sctp_free_remote_addr(chk->whoTo);
7797                         chk->whoTo = NULL;
7798                 }
7799         }
7800 }
7801
7802 int
7803 sctp_med_chunk_output(struct sctp_inpcb *inp,
7804     struct sctp_tcb *stcb,
7805     struct sctp_association *asoc,
7806     int *num_out,
7807     int *reason_code,
7808     int control_only, int from_where,
7809     struct timeval *now, int *now_filled, int frag_point, int so_locked
7810 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7811     SCTP_UNUSED
7812 #endif
7813 )
7814 {
7815         /**
7816          * Ok this is the generic chunk service queue. we must do the
7817          * following:
7818          * - Service the stream queue that is next, moving any
7819          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7820          *   LAST to the out queue in one pass) and assigning TSN's. This
7821          *   only applys though if the peer does not support NDATA. For NDATA
7822          *   chunks its ok to not send the entire message ;-)
7823          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7824          *   fomulate and send the low level chunks. Making sure to combine
7825          *   any control in the control chunk queue also.
7826          */
7827         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7828         struct mbuf *outchain, *endoutchain;
7829         struct sctp_tmit_chunk *chk, *nchk;
7830
7831         /* temp arrays for unlinking */
7832         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7833         int no_fragmentflg, error;
7834         unsigned int max_rwnd_per_dest, max_send_per_dest;
7835         int one_chunk, hbflag, skip_data_for_this_net;
7836         int asconf, cookie, no_out_cnt;
7837         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7838         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7839         int tsns_sent = 0;
7840         uint32_t auth_offset = 0;
7841         struct sctp_auth_chunk *auth = NULL;
7842         uint16_t auth_keyid;
7843         int override_ok = 1;
7844         int skip_fill_up = 0;
7845         int data_auth_reqd = 0;
7846
7847         /*
7848          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7849          * destination.
7850          */
7851         int quit_now = 0;
7852
7853         *num_out = 0;
7854         *reason_code = 0;
7855         auth_keyid = stcb->asoc.authinfo.active_keyid;
7856         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7857             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7858             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7859                 eeor_mode = 1;
7860         } else {
7861                 eeor_mode = 0;
7862         }
7863         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7864         /*
7865          * First lets prime the pump. For each destination, if there is room
7866          * in the flight size, attempt to pull an MTU's worth out of the
7867          * stream queues into the general send_queue
7868          */
7869 #ifdef SCTP_AUDITING_ENABLED
7870         sctp_audit_log(0xC2, 2);
7871 #endif
7872         SCTP_TCB_LOCK_ASSERT(stcb);
7873         hbflag = 0;
7874         if (control_only)
7875                 no_data_chunks = 1;
7876         else
7877                 no_data_chunks = 0;
7878
7879         /* Nothing to possible to send? */
7880         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7881             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7882             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7883             TAILQ_EMPTY(&asoc->send_queue) &&
7884             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7885 nothing_to_send:
7886                 *reason_code = 9;
7887                 return (0);
7888         }
7889         if (asoc->peers_rwnd == 0) {
7890                 /* No room in peers rwnd */
7891                 *reason_code = 1;
7892                 if (asoc->total_flight > 0) {
7893                         /* we are allowed one chunk in flight */
7894                         no_data_chunks = 1;
7895                 }
7896         }
7897         if (stcb->asoc.ecn_echo_cnt_onq) {
7898                 /* Record where a sack goes, if any */
7899                 if (no_data_chunks &&
7900                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7901                         /* Nothing but ECNe to send - we don't do that */
7902                         goto nothing_to_send;
7903                 }
7904                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7905                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7906                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7907                                 sack_goes_to = chk->whoTo;
7908                                 break;
7909                         }
7910                 }
7911         }
7912         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7913         if (stcb->sctp_socket)
7914                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7915         else
7916                 max_send_per_dest = 0;
7917         if (no_data_chunks == 0) {
7918                 /* How many non-directed chunks are there? */
7919                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7920                         if (chk->whoTo == NULL) {
7921                                 /*
7922                                  * We already have non-directed chunks on
7923                                  * the queue, no need to do a fill-up.
7924                                  */
7925                                 skip_fill_up = 1;
7926                                 break;
7927                         }
7928                 }
7929
7930         }
7931         if ((no_data_chunks == 0) &&
7932             (skip_fill_up == 0) &&
7933             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7934                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7935                         /*
7936                          * This for loop we are in takes in each net, if
7937                          * its's got space in cwnd and has data sent to it
7938                          * (when CMT is off) then it calls
7939                          * sctp_fill_outqueue for the net. This gets data on
7940                          * the send queue for that network.
7941                          *
7942                          * In sctp_fill_outqueue TSN's are assigned and data
7943                          * is copied out of the stream buffers. Note mostly
7944                          * copy by reference (we hope).
7945                          */
7946                         net->window_probe = 0;
7947                         if ((net != stcb->asoc.alternate) &&
7948                             ((net->dest_state & SCTP_ADDR_PF) ||
7949                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7950                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7951                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7952                                         sctp_log_cwnd(stcb, net, 1,
7953                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7954                                 }
7955                                 continue;
7956                         }
7957                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7958                             (net->flight_size == 0)) {
7959                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7960                         }
7961                         if (net->flight_size >= net->cwnd) {
7962                                 /* skip this network, no room - can't fill */
7963                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7964                                         sctp_log_cwnd(stcb, net, 3,
7965                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7966                                 }
7967                                 continue;
7968                         }
7969                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7970                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7971                         }
7972                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7973                         if (quit_now) {
7974                                 /* memory alloc failure */
7975                                 no_data_chunks = 1;
7976                                 break;
7977                         }
7978                 }
7979         }
7980         /* now service each destination and send out what we can for it */
7981         /* Nothing to send? */
7982         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7983             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7984             TAILQ_EMPTY(&asoc->send_queue)) {
7985                 *reason_code = 8;
7986                 return (0);
7987         }
7988
7989         if (asoc->sctp_cmt_on_off > 0) {
7990                 /* get the last start point */
7991                 start_at = asoc->last_net_cmt_send_started;
7992                 if (start_at == NULL) {
7993                         /* null so to beginning */
7994                         start_at = TAILQ_FIRST(&asoc->nets);
7995                 } else {
7996                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7997                         if (start_at == NULL) {
7998                                 start_at = TAILQ_FIRST(&asoc->nets);
7999                         }
8000                 }
8001                 asoc->last_net_cmt_send_started = start_at;
8002         } else {
8003                 start_at = TAILQ_FIRST(&asoc->nets);
8004         }
8005         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8006                 if (chk->whoTo == NULL) {
8007                         if (asoc->alternate) {
8008                                 chk->whoTo = asoc->alternate;
8009                         } else {
8010                                 chk->whoTo = asoc->primary_destination;
8011                         }
8012                         atomic_add_int(&chk->whoTo->ref_count, 1);
8013                 }
8014         }
8015         old_start_at = NULL;
8016 again_one_more_time:
8017         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8018                 /* how much can we send? */
8019                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8020                 if (old_start_at && (old_start_at == net)) {
8021                         /* through list ocmpletely. */
8022                         break;
8023                 }
8024                 tsns_sent = 0xa;
8025                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8026                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8027                     (net->flight_size >= net->cwnd)) {
8028                         /*
8029                          * Nothing on control or asconf and flight is full,
8030                          * we can skip even in the CMT case.
8031                          */
8032                         continue;
8033                 }
8034                 bundle_at = 0;
8035                 endoutchain = outchain = NULL;
8036                 no_fragmentflg = 1;
8037                 one_chunk = 0;
8038                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8039                         skip_data_for_this_net = 1;
8040                 } else {
8041                         skip_data_for_this_net = 0;
8042                 }
8043                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8044 #ifdef INET
8045                 case AF_INET:
8046                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8047                         break;
8048 #endif
8049 #ifdef INET6
8050                 case AF_INET6:
8051                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8052                         break;
8053 #endif
8054                 default:
8055                         /* TSNH */
8056                         mtu = net->mtu;
8057                         break;
8058                 }
8059                 mx_mtu = mtu;
8060                 to_out = 0;
8061                 if (mtu > asoc->peers_rwnd) {
8062                         if (asoc->total_flight > 0) {
8063                                 /* We have a packet in flight somewhere */
8064                                 r_mtu = asoc->peers_rwnd;
8065                         } else {
8066                                 /* We are always allowed to send one MTU out */
8067                                 one_chunk = 1;
8068                                 r_mtu = mtu;
8069                         }
8070                 } else {
8071                         r_mtu = mtu;
8072                 }
8073                 error = 0;
8074                 /************************/
8075                 /* ASCONF transmission */
8076                 /************************/
8077                 /* Now first lets go through the asconf queue */
8078                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8079                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8080                                 continue;
8081                         }
8082                         if (chk->whoTo == NULL) {
8083                                 if (asoc->alternate == NULL) {
8084                                         if (asoc->primary_destination != net) {
8085                                                 break;
8086                                         }
8087                                 } else {
8088                                         if (asoc->alternate != net) {
8089                                                 break;
8090                                         }
8091                                 }
8092                         } else {
8093                                 if (chk->whoTo != net) {
8094                                         break;
8095                                 }
8096                         }
8097                         if (chk->data == NULL) {
8098                                 break;
8099                         }
8100                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8101                             chk->sent != SCTP_DATAGRAM_RESEND) {
8102                                 break;
8103                         }
8104                         /*
8105                          * if no AUTH is yet included and this chunk
8106                          * requires it, make sure to account for it.  We
8107                          * don't apply the size until the AUTH chunk is
8108                          * actually added below in case there is no room for
8109                          * this chunk. NOTE: we overload the use of "omtu"
8110                          * here
8111                          */
8112                         if ((auth == NULL) &&
8113                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8114                             stcb->asoc.peer_auth_chunks)) {
8115                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8116                         } else
8117                                 omtu = 0;
8118                         /* Here we do NOT factor the r_mtu */
8119                         if ((chk->send_size < (int)(mtu - omtu)) ||
8120                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8121                                 /*
8122                                  * We probably should glom the mbuf chain
8123                                  * from the chk->data for control but the
8124                                  * problem is it becomes yet one more level
8125                                  * of tracking to do if for some reason
8126                                  * output fails. Then I have got to
8127                                  * reconstruct the merged control chain.. el
8128                                  * yucko.. for now we take the easy way and
8129                                  * do the copy
8130                                  */
8131                                 /*
8132                                  * Add an AUTH chunk, if chunk requires it
8133                                  * save the offset into the chain for AUTH
8134                                  */
8135                                 if ((auth == NULL) &&
8136                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8137                                     stcb->asoc.peer_auth_chunks))) {
8138                                         outchain = sctp_add_auth_chunk(outchain,
8139                                             &endoutchain,
8140                                             &auth,
8141                                             &auth_offset,
8142                                             stcb,
8143                                             chk->rec.chunk_id.id);
8144                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8145                                 }
8146                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8147                                     (int)chk->rec.chunk_id.can_take_data,
8148                                     chk->send_size, chk->copy_by_ref);
8149                                 if (outchain == NULL) {
8150                                         *reason_code = 8;
8151                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8152                                         return (ENOMEM);
8153                                 }
8154                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8155                                 /* update our MTU size */
8156                                 if (mtu > (chk->send_size + omtu))
8157                                         mtu -= (chk->send_size + omtu);
8158                                 else
8159                                         mtu = 0;
8160                                 to_out += (chk->send_size + omtu);
8161                                 /* Do clear IP_DF ? */
8162                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8163                                         no_fragmentflg = 0;
8164                                 }
8165                                 if (chk->rec.chunk_id.can_take_data)
8166                                         chk->data = NULL;
8167                                 /*
8168                                  * set hb flag since we can use these for
8169                                  * RTO
8170                                  */
8171                                 hbflag = 1;
8172                                 asconf = 1;
8173                                 /*
8174                                  * should sysctl this: don't bundle data
8175                                  * with ASCONF since it requires AUTH
8176                                  */
8177                                 no_data_chunks = 1;
8178                                 chk->sent = SCTP_DATAGRAM_SENT;
8179                                 if (chk->whoTo == NULL) {
8180                                         chk->whoTo = net;
8181                                         atomic_add_int(&net->ref_count, 1);
8182                                 }
8183                                 chk->snd_count++;
8184                                 if (mtu == 0) {
8185                                         /*
8186                                          * Ok we are out of room but we can
8187                                          * output without effecting the
8188                                          * flight size since this little guy
8189                                          * is a control only packet.
8190                                          */
8191                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8192                                         /*
8193                                          * do NOT clear the asconf flag as
8194                                          * it is used to do appropriate
8195                                          * source address selection.
8196                                          */
8197                                         if (*now_filled == 0) {
8198                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8199                                                 *now_filled = 1;
8200                                         }
8201                                         net->last_sent_time = *now;
8202                                         hbflag = 0;
8203                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8204                                             (struct sockaddr *)&net->ro._l_addr,
8205                                             outchain, auth_offset, auth,
8206                                             stcb->asoc.authinfo.active_keyid,
8207                                             no_fragmentflg, 0, asconf,
8208                                             inp->sctp_lport, stcb->rport,
8209                                             htonl(stcb->asoc.peer_vtag),
8210                                             net->port, NULL,
8211                                             0, 0,
8212                                             so_locked))) {
8213                                                 /*
8214                                                  * error, we could not
8215                                                  * output
8216                                                  */
8217                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8218                                                 if (from_where == 0) {
8219                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8220                                                 }
8221                                                 if (error == ENOBUFS) {
8222                                                         asoc->ifp_had_enobuf = 1;
8223                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8224                                                 }
8225                                                 /* error, could not output */
8226                                                 if (error == EHOSTUNREACH) {
8227                                                         /*
8228                                                          * Destination went
8229                                                          * unreachable
8230                                                          * during this send
8231                                                          */
8232                                                         sctp_move_chunks_from_net(stcb, net);
8233                                                 }
8234                                                 *reason_code = 7;
8235                                                 break;
8236                                         } else {
8237                                                 asoc->ifp_had_enobuf = 0;
8238                                         }
8239                                         /*
8240                                          * increase the number we sent, if a
8241                                          * cookie is sent we don't tell them
8242                                          * any was sent out.
8243                                          */
8244                                         outchain = endoutchain = NULL;
8245                                         auth = NULL;
8246                                         auth_offset = 0;
8247                                         if (!no_out_cnt)
8248                                                 *num_out += ctl_cnt;
8249                                         /* recalc a clean slate and setup */
8250                                         switch (net->ro._l_addr.sa.sa_family) {
8251 #ifdef INET
8252                                         case AF_INET:
8253                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8254                                                 break;
8255 #endif
8256 #ifdef INET6
8257                                         case AF_INET6:
8258                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8259                                                 break;
8260 #endif
8261                                         default:
8262                                                 /* TSNH */
8263                                                 mtu = net->mtu;
8264                                                 break;
8265                                         }
8266                                         to_out = 0;
8267                                         no_fragmentflg = 1;
8268                                 }
8269                         }
8270                 }
8271                 if (error != 0) {
8272                         /* try next net */
8273                         continue;
8274                 }
8275                 /************************/
8276                 /* Control transmission */
8277                 /************************/
8278                 /* Now first lets go through the control queue */
8279                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8280                         if ((sack_goes_to) &&
8281                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8282                             (chk->whoTo != sack_goes_to)) {
8283                                 /*
8284                                  * if we have a sack in queue, and we are
8285                                  * looking at an ecn echo that is NOT queued
8286                                  * to where the sack is going..
8287                                  */
8288                                 if (chk->whoTo == net) {
8289                                         /*
8290                                          * Don't transmit it to where its
8291                                          * going (current net)
8292                                          */
8293                                         continue;
8294                                 } else if (sack_goes_to == net) {
8295                                         /*
8296                                          * But do transmit it to this
8297                                          * address
8298                                          */
8299                                         goto skip_net_check;
8300                                 }
8301                         }
8302                         if (chk->whoTo == NULL) {
8303                                 if (asoc->alternate == NULL) {
8304                                         if (asoc->primary_destination != net) {
8305                                                 continue;
8306                                         }
8307                                 } else {
8308                                         if (asoc->alternate != net) {
8309                                                 continue;
8310                                         }
8311                                 }
8312                         } else {
8313                                 if (chk->whoTo != net) {
8314                                         continue;
8315                                 }
8316                         }
8317         skip_net_check:
8318                         if (chk->data == NULL) {
8319                                 continue;
8320                         }
8321                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8322                                 /*
8323                                  * It must be unsent. Cookies and ASCONF's
8324                                  * hang around but there timers will force
8325                                  * when marked for resend.
8326                                  */
8327                                 continue;
8328                         }
8329                         /*
8330                          * if no AUTH is yet included and this chunk
8331                          * requires it, make sure to account for it.  We
8332                          * don't apply the size until the AUTH chunk is
8333                          * actually added below in case there is no room for
8334                          * this chunk. NOTE: we overload the use of "omtu"
8335                          * here
8336                          */
8337                         if ((auth == NULL) &&
8338                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8339                             stcb->asoc.peer_auth_chunks)) {
8340                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8341                         } else
8342                                 omtu = 0;
8343                         /* Here we do NOT factor the r_mtu */
8344                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8345                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8346                                 /*
8347                                  * We probably should glom the mbuf chain
8348                                  * from the chk->data for control but the
8349                                  * problem is it becomes yet one more level
8350                                  * of tracking to do if for some reason
8351                                  * output fails. Then I have got to
8352                                  * reconstruct the merged control chain.. el
8353                                  * yucko.. for now we take the easy way and
8354                                  * do the copy
8355                                  */
8356                                 /*
8357                                  * Add an AUTH chunk, if chunk requires it
8358                                  * save the offset into the chain for AUTH
8359                                  */
8360                                 if ((auth == NULL) &&
8361                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8362                                     stcb->asoc.peer_auth_chunks))) {
8363                                         outchain = sctp_add_auth_chunk(outchain,
8364                                             &endoutchain,
8365                                             &auth,
8366                                             &auth_offset,
8367                                             stcb,
8368                                             chk->rec.chunk_id.id);
8369                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8370                                 }
8371                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8372                                     (int)chk->rec.chunk_id.can_take_data,
8373                                     chk->send_size, chk->copy_by_ref);
8374                                 if (outchain == NULL) {
8375                                         *reason_code = 8;
8376                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8377                                         return (ENOMEM);
8378                                 }
8379                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8380                                 /* update our MTU size */
8381                                 if (mtu > (chk->send_size + omtu))
8382                                         mtu -= (chk->send_size + omtu);
8383                                 else
8384                                         mtu = 0;
8385                                 to_out += (chk->send_size + omtu);
8386                                 /* Do clear IP_DF ? */
8387                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8388                                         no_fragmentflg = 0;
8389                                 }
8390                                 if (chk->rec.chunk_id.can_take_data)
8391                                         chk->data = NULL;
8392                                 /* Mark things to be removed, if needed */
8393                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8394                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8395                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8396                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8397                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8398                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8399                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8400                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8401                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8402                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8403                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8404                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8405                                                 hbflag = 1;
8406                                         }
8407                                         /* remove these chunks at the end */
8408                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8409                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8410                                                 /* turn off the timer */
8411                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8412                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8413                                                             inp, stcb, net,
8414                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8415                                                 }
8416                                         }
8417                                         ctl_cnt++;
8418                                 } else {
8419                                         /*
8420                                          * Other chunks, since they have
8421                                          * timers running (i.e. COOKIE) we
8422                                          * just "trust" that it gets sent or
8423                                          * retransmitted.
8424                                          */
8425                                         ctl_cnt++;
8426                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8427                                                 cookie = 1;
8428                                                 no_out_cnt = 1;
8429                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8430                                                 /*
8431                                                  * Increment ecne send count
8432                                                  * here this means we may be
8433                                                  * over-zealous in our
8434                                                  * counting if the send
8435                                                  * fails, but its the best
8436                                                  * place to do it (we used
8437                                                  * to do it in the queue of
8438                                                  * the chunk, but that did
8439                                                  * not tell how many times
8440                                                  * it was sent.
8441                                                  */
8442                                                 SCTP_STAT_INCR(sctps_sendecne);
8443                                         }
8444                                         chk->sent = SCTP_DATAGRAM_SENT;
8445                                         if (chk->whoTo == NULL) {
8446                                                 chk->whoTo = net;
8447                                                 atomic_add_int(&net->ref_count, 1);
8448                                         }
8449                                         chk->snd_count++;
8450                                 }
8451                                 if (mtu == 0) {
8452                                         /*
8453                                          * Ok we are out of room but we can
8454                                          * output without effecting the
8455                                          * flight size since this little guy
8456                                          * is a control only packet.
8457                                          */
8458                                         if (asconf) {
8459                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8460                                                 /*
8461                                                  * do NOT clear the asconf
8462                                                  * flag as it is used to do
8463                                                  * appropriate source
8464                                                  * address selection.
8465                                                  */
8466                                         }
8467                                         if (cookie) {
8468                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8469                                                 cookie = 0;
8470                                         }
8471                                         /* Only HB or ASCONF advances time */
8472                                         if (hbflag) {
8473                                                 if (*now_filled == 0) {
8474                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8475                                                         *now_filled = 1;
8476                                                 }
8477                                                 net->last_sent_time = *now;
8478                                                 hbflag = 0;
8479                                         }
8480                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8481                                             (struct sockaddr *)&net->ro._l_addr,
8482                                             outchain,
8483                                             auth_offset, auth,
8484                                             stcb->asoc.authinfo.active_keyid,
8485                                             no_fragmentflg, 0, asconf,
8486                                             inp->sctp_lport, stcb->rport,
8487                                             htonl(stcb->asoc.peer_vtag),
8488                                             net->port, NULL,
8489                                             0, 0,
8490                                             so_locked))) {
8491                                                 /*
8492                                                  * error, we could not
8493                                                  * output
8494                                                  */
8495                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8496                                                 if (from_where == 0) {
8497                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8498                                                 }
8499                                                 if (error == ENOBUFS) {
8500                                                         asoc->ifp_had_enobuf = 1;
8501                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8502                                                 }
8503                                                 if (error == EHOSTUNREACH) {
8504                                                         /*
8505                                                          * Destination went
8506                                                          * unreachable
8507                                                          * during this send
8508                                                          */
8509                                                         sctp_move_chunks_from_net(stcb, net);
8510                                                 }
8511                                                 *reason_code = 7;
8512                                                 break;
8513                                         } else {
8514                                                 asoc->ifp_had_enobuf = 0;
8515                                         }
8516                                         /*
8517                                          * increase the number we sent, if a
8518                                          * cookie is sent we don't tell them
8519                                          * any was sent out.
8520                                          */
8521                                         outchain = endoutchain = NULL;
8522                                         auth = NULL;
8523                                         auth_offset = 0;
8524                                         if (!no_out_cnt)
8525                                                 *num_out += ctl_cnt;
8526                                         /* recalc a clean slate and setup */
8527                                         switch (net->ro._l_addr.sa.sa_family) {
8528 #ifdef INET
8529                                         case AF_INET:
8530                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8531                                                 break;
8532 #endif
8533 #ifdef INET6
8534                                         case AF_INET6:
8535                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8536                                                 break;
8537 #endif
8538                                         default:
8539                                                 /* TSNH */
8540                                                 mtu = net->mtu;
8541                                                 break;
8542                                         }
8543                                         to_out = 0;
8544                                         no_fragmentflg = 1;
8545                                 }
8546                         }
8547                 }
8548                 if (error != 0) {
8549                         /* try next net */
8550                         continue;
8551                 }
8552                 /* JRI: if dest is in PF state, do not send data to it */
8553                 if ((asoc->sctp_cmt_on_off > 0) &&
8554                     (net != stcb->asoc.alternate) &&
8555                     (net->dest_state & SCTP_ADDR_PF)) {
8556                         goto no_data_fill;
8557                 }
8558                 if (net->flight_size >= net->cwnd) {
8559                         goto no_data_fill;
8560                 }
8561                 if ((asoc->sctp_cmt_on_off > 0) &&
8562                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8563                     (net->flight_size > max_rwnd_per_dest)) {
8564                         goto no_data_fill;
8565                 }
8566                 /*
8567                  * We need a specific accounting for the usage of the send
8568                  * buffer. We also need to check the number of messages per
8569                  * net. For now, this is better than nothing and it disabled
8570                  * by default...
8571                  */
8572                 if ((asoc->sctp_cmt_on_off > 0) &&
8573                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8574                     (max_send_per_dest > 0) &&
8575                     (net->flight_size > max_send_per_dest)) {
8576                         goto no_data_fill;
8577                 }
8578                 /*********************/
8579                 /* Data transmission */
8580                 /*********************/
8581                 /*
8582                  * if AUTH for DATA is required and no AUTH has been added
8583                  * yet, account for this in the mtu now... if no data can be
8584                  * bundled, this adjustment won't matter anyways since the
8585                  * packet will be going out...
8586                  */
8587                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8588                     stcb->asoc.peer_auth_chunks);
8589                 if (data_auth_reqd && (auth == NULL)) {
8590                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8591                 }
8592                 /* now lets add any data within the MTU constraints */
8593                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8594 #ifdef INET
8595                 case AF_INET:
8596                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8597                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8598                         else
8599                                 omtu = 0;
8600                         break;
8601 #endif
8602 #ifdef INET6
8603                 case AF_INET6:
8604                         if (net->mtu > SCTP_MIN_OVERHEAD)
8605                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8606                         else
8607                                 omtu = 0;
8608                         break;
8609 #endif
8610                 default:
8611                         /* TSNH */
8612                         omtu = 0;
8613                         break;
8614                 }
8615                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8616                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8617                     (skip_data_for_this_net == 0)) ||
8618                     (cookie)) {
8619                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8620                                 if (no_data_chunks) {
8621                                         /* let only control go out */
8622                                         *reason_code = 1;
8623                                         break;
8624                                 }
8625                                 if (net->flight_size >= net->cwnd) {
8626                                         /* skip this net, no room for data */
8627                                         *reason_code = 2;
8628                                         break;
8629                                 }
8630                                 if ((chk->whoTo != NULL) &&
8631                                     (chk->whoTo != net)) {
8632                                         /* Don't send the chunk on this net */
8633                                         continue;
8634                                 }
8635
8636                                 if (asoc->sctp_cmt_on_off == 0) {
8637                                         if ((asoc->alternate) &&
8638                                             (asoc->alternate != net) &&
8639                                             (chk->whoTo == NULL)) {
8640                                                 continue;
8641                                         } else if ((net != asoc->primary_destination) &&
8642                                                     (asoc->alternate == NULL) &&
8643                                             (chk->whoTo == NULL)) {
8644                                                 continue;
8645                                         }
8646                                 }
8647                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8648                                         /*-
8649                                          * strange, we have a chunk that is
8650                                          * to big for its destination and
8651                                          * yet no fragment ok flag.
8652                                          * Something went wrong when the
8653                                          * PMTU changed...we did not mark
8654                                          * this chunk for some reason?? I
8655                                          * will fix it here by letting IP
8656                                          * fragment it for now and printing
8657                                          * a warning. This really should not
8658                                          * happen ...
8659                                          */
8660                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8661                                             chk->send_size, mtu);
8662                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8663                                 }
8664                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8665                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8666                                         struct sctp_data_chunk *dchkh;
8667
8668                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8669                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8670                                 }
8671                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8672                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8673                                         /* ok we will add this one */
8674
8675                                         /*
8676                                          * Add an AUTH chunk, if chunk
8677                                          * requires it, save the offset into
8678                                          * the chain for AUTH
8679                                          */
8680                                         if (data_auth_reqd) {
8681                                                 if (auth == NULL) {
8682                                                         outchain = sctp_add_auth_chunk(outchain,
8683                                                             &endoutchain,
8684                                                             &auth,
8685                                                             &auth_offset,
8686                                                             stcb,
8687                                                             SCTP_DATA);
8688                                                         auth_keyid = chk->auth_keyid;
8689                                                         override_ok = 0;
8690                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8691                                                 } else if (override_ok) {
8692                                                         /*
8693                                                          * use this data's
8694                                                          * keyid
8695                                                          */
8696                                                         auth_keyid = chk->auth_keyid;
8697                                                         override_ok = 0;
8698                                                 } else if (auth_keyid != chk->auth_keyid) {
8699                                                         /*
8700                                                          * different keyid,
8701                                                          * so done bundling
8702                                                          */
8703                                                         break;
8704                                                 }
8705                                         }
8706                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8707                                             chk->send_size, chk->copy_by_ref);
8708                                         if (outchain == NULL) {
8709                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8710                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8711                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8712                                                 }
8713                                                 *reason_code = 3;
8714                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8715                                                 return (ENOMEM);
8716                                         }
8717                                         /* upate our MTU size */
8718                                         /* Do clear IP_DF ? */
8719                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8720                                                 no_fragmentflg = 0;
8721                                         }
8722                                         /* unsigned subtraction of mtu */
8723                                         if (mtu > chk->send_size)
8724                                                 mtu -= chk->send_size;
8725                                         else
8726                                                 mtu = 0;
8727                                         /* unsigned subtraction of r_mtu */
8728                                         if (r_mtu > chk->send_size)
8729                                                 r_mtu -= chk->send_size;
8730                                         else
8731                                                 r_mtu = 0;
8732
8733                                         to_out += chk->send_size;
8734                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8735 #ifdef INVARIANTS
8736                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8737 #else
8738                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8739                                                     mx_mtu, to_out);
8740 #endif
8741                                         }
8742                                         chk->window_probe = 0;
8743                                         data_list[bundle_at++] = chk;
8744                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8745                                                 break;
8746                                         }
8747                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8748                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8749                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8750                                                 } else {
8751                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8752                                                 }
8753                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8754                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8755                                                         /*
8756                                                          * Count number of
8757                                                          * user msg's that
8758                                                          * were fragmented
8759                                                          * we do this by
8760                                                          * counting when we
8761                                                          * see a LAST
8762                                                          * fragment only.
8763                                                          */
8764                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8765                                         }
8766                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8767                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8768                                                         data_list[0]->window_probe = 1;
8769                                                         net->window_probe = 1;
8770                                                 }
8771                                                 break;
8772                                         }
8773                                 } else {
8774                                         /*
8775                                          * Must be sent in order of the
8776                                          * TSN's (on a network)
8777                                          */
8778                                         break;
8779                                 }
8780                         }       /* for (chunk gather loop for this net) */
8781                 }               /* if asoc.state OPEN */
8782 no_data_fill:
8783                 /* Is there something to send for this destination? */
8784                 if (outchain) {
8785                         /* We may need to start a control timer or two */
8786                         if (asconf) {
8787                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8788                                     stcb, net);
8789                                 /*
8790                                  * do NOT clear the asconf flag as it is
8791                                  * used to do appropriate source address
8792                                  * selection.
8793                                  */
8794                         }
8795                         if (cookie) {
8796                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8797                                 cookie = 0;
8798                         }
8799                         /* must start a send timer if data is being sent */
8800                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8801                                 /*
8802                                  * no timer running on this destination
8803                                  * restart it.
8804                                  */
8805                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8806                         }
8807                         if (bundle_at || hbflag) {
8808                                 /* For data/asconf and hb set time */
8809                                 if (*now_filled == 0) {
8810                                         (void)SCTP_GETTIME_TIMEVAL(now);
8811                                         *now_filled = 1;
8812                                 }
8813                                 net->last_sent_time = *now;
8814                         }
8815                         /* Now send it, if there is anything to send :> */
8816                         if ((error = sctp_lowlevel_chunk_output(inp,
8817                             stcb,
8818                             net,
8819                             (struct sockaddr *)&net->ro._l_addr,
8820                             outchain,
8821                             auth_offset,
8822                             auth,
8823                             auth_keyid,
8824                             no_fragmentflg,
8825                             bundle_at,
8826                             asconf,
8827                             inp->sctp_lport, stcb->rport,
8828                             htonl(stcb->asoc.peer_vtag),
8829                             net->port, NULL,
8830                             0, 0,
8831                             so_locked))) {
8832                                 /* error, we could not output */
8833                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8834                                 if (from_where == 0) {
8835                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8836                                 }
8837                                 if (error == ENOBUFS) {
8838                                         asoc->ifp_had_enobuf = 1;
8839                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8840                                 }
8841                                 if (error == EHOSTUNREACH) {
8842                                         /*
8843                                          * Destination went unreachable
8844                                          * during this send
8845                                          */
8846                                         sctp_move_chunks_from_net(stcb, net);
8847                                 }
8848                                 *reason_code = 6;
8849                                 /*-
8850                                  * I add this line to be paranoid. As far as
8851                                  * I can tell the continue, takes us back to
8852                                  * the top of the for, but just to make sure
8853                                  * I will reset these again here.
8854                                  */
8855                                 ctl_cnt = bundle_at = 0;
8856                                 continue;       /* This takes us back to the
8857                                                  * for() for the nets. */
8858                         } else {
8859                                 asoc->ifp_had_enobuf = 0;
8860                         }
8861                         endoutchain = NULL;
8862                         auth = NULL;
8863                         auth_offset = 0;
8864                         if (!no_out_cnt) {
8865                                 *num_out += (ctl_cnt + bundle_at);
8866                         }
8867                         if (bundle_at) {
8868                                 /* setup for a RTO measurement */
8869                                 tsns_sent = data_list[0]->rec.data.tsn;
8870                                 /* fill time if not already filled */
8871                                 if (*now_filled == 0) {
8872                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8873                                         *now_filled = 1;
8874                                         *now = asoc->time_last_sent;
8875                                 } else {
8876                                         asoc->time_last_sent = *now;
8877                                 }
8878                                 if (net->rto_needed) {
8879                                         data_list[0]->do_rtt = 1;
8880                                         net->rto_needed = 0;
8881                                 }
8882                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8883                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8884                         }
8885                         if (one_chunk) {
8886                                 break;
8887                         }
8888                 }
8889                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8890                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8891                 }
8892         }
8893         if (old_start_at == NULL) {
8894                 old_start_at = start_at;
8895                 start_at = TAILQ_FIRST(&asoc->nets);
8896                 if (old_start_at)
8897                         goto again_one_more_time;
8898         }
8899
8900         /*
8901          * At the end there should be no NON timed chunks hanging on this
8902          * queue.
8903          */
8904         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8905                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8906         }
8907         if ((*num_out == 0) && (*reason_code == 0)) {
8908                 *reason_code = 4;
8909         } else {
8910                 *reason_code = 5;
8911         }
8912         sctp_clean_up_ctl(stcb, asoc, so_locked);
8913         return (0);
8914 }
8915
8916 void
8917 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8918 {
8919         /*-
8920          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8921          * the control chunk queue.
8922          */
8923         struct sctp_chunkhdr *hdr;
8924         struct sctp_tmit_chunk *chk;
8925         struct mbuf *mat, *last_mbuf;
8926         uint32_t chunk_length;
8927         uint16_t padding_length;
8928
8929         SCTP_TCB_LOCK_ASSERT(stcb);
8930         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8931         if (op_err == NULL) {
8932                 return;
8933         }
8934         last_mbuf = NULL;
8935         chunk_length = 0;
8936         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8937                 chunk_length += SCTP_BUF_LEN(mat);
8938                 if (SCTP_BUF_NEXT(mat) == NULL) {
8939                         last_mbuf = mat;
8940                 }
8941         }
8942         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8943                 sctp_m_freem(op_err);
8944                 return;
8945         }
8946         padding_length = chunk_length % 4;
8947         if (padding_length != 0) {
8948                 padding_length = 4 - padding_length;
8949         }
8950         if (padding_length != 0) {
8951                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8952                         sctp_m_freem(op_err);
8953                         return;
8954                 }
8955         }
8956         sctp_alloc_a_chunk(stcb, chk);
8957         if (chk == NULL) {
8958                 /* no memory */
8959                 sctp_m_freem(op_err);
8960                 return;
8961         }
8962         chk->copy_by_ref = 0;
8963         chk->send_size = (uint16_t)chunk_length;
8964         chk->sent = SCTP_DATAGRAM_UNSENT;
8965         chk->snd_count = 0;
8966         chk->asoc = &stcb->asoc;
8967         chk->data = op_err;
8968         chk->whoTo = NULL;
8969         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8970         chk->rec.chunk_id.can_take_data = 0;
8971         hdr = mtod(op_err, struct sctp_chunkhdr *);
8972         hdr->chunk_type = SCTP_OPERATION_ERROR;
8973         hdr->chunk_flags = 0;
8974         hdr->chunk_length = htons(chk->send_size);
8975         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8976         chk->asoc->ctrl_queue_cnt++;
8977 }
8978
8979 int
8980 sctp_send_cookie_echo(struct mbuf *m,
8981     int offset,
8982     struct sctp_tcb *stcb,
8983     struct sctp_nets *net)
8984 {
8985         /*-
8986          * pull out the cookie and put it at the front of the control chunk
8987          * queue.
8988          */
8989         int at;
8990         struct mbuf *cookie;
8991         struct sctp_paramhdr param, *phdr;
8992         struct sctp_chunkhdr *hdr;
8993         struct sctp_tmit_chunk *chk;
8994         uint16_t ptype, plen;
8995
8996         SCTP_TCB_LOCK_ASSERT(stcb);
8997         /* First find the cookie in the param area */
8998         cookie = NULL;
8999         at = offset + sizeof(struct sctp_init_chunk);
9000         for (;;) {
9001                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9002                 if (phdr == NULL) {
9003                         return (-3);
9004                 }
9005                 ptype = ntohs(phdr->param_type);
9006                 plen = ntohs(phdr->param_length);
9007                 if (ptype == SCTP_STATE_COOKIE) {
9008                         int pad;
9009
9010                         /* found the cookie */
9011                         if ((pad = (plen % 4))) {
9012                                 plen += 4 - pad;
9013                         }
9014                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9015                         if (cookie == NULL) {
9016                                 /* No memory */
9017                                 return (-2);
9018                         }
9019 #ifdef SCTP_MBUF_LOGGING
9020                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9021                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9022                         }
9023 #endif
9024                         break;
9025                 }
9026                 at += SCTP_SIZE32(plen);
9027         }
9028         /* ok, we got the cookie lets change it into a cookie echo chunk */
9029         /* first the change from param to cookie */
9030         hdr = mtod(cookie, struct sctp_chunkhdr *);
9031         hdr->chunk_type = SCTP_COOKIE_ECHO;
9032         hdr->chunk_flags = 0;
9033         /* get the chunk stuff now and place it in the FRONT of the queue */
9034         sctp_alloc_a_chunk(stcb, chk);
9035         if (chk == NULL) {
9036                 /* no memory */
9037                 sctp_m_freem(cookie);
9038                 return (-5);
9039         }
9040         chk->copy_by_ref = 0;
9041         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9042         chk->rec.chunk_id.can_take_data = 0;
9043         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9044         chk->send_size = plen;
9045         chk->sent = SCTP_DATAGRAM_UNSENT;
9046         chk->snd_count = 0;
9047         chk->asoc = &stcb->asoc;
9048         chk->data = cookie;
9049         chk->whoTo = net;
9050         atomic_add_int(&chk->whoTo->ref_count, 1);
9051         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9052         chk->asoc->ctrl_queue_cnt++;
9053         return (0);
9054 }
9055
9056 void
9057 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9058     struct mbuf *m,
9059     int offset,
9060     int chk_length,
9061     struct sctp_nets *net)
9062 {
9063         /*
9064          * take a HB request and make it into a HB ack and send it.
9065          */
9066         struct mbuf *outchain;
9067         struct sctp_chunkhdr *chdr;
9068         struct sctp_tmit_chunk *chk;
9069
9070
9071         if (net == NULL)
9072                 /* must have a net pointer */
9073                 return;
9074
9075         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9076         if (outchain == NULL) {
9077                 /* gak out of memory */
9078                 return;
9079         }
9080 #ifdef SCTP_MBUF_LOGGING
9081         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9082                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9083         }
9084 #endif
9085         chdr = mtod(outchain, struct sctp_chunkhdr *);
9086         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9087         chdr->chunk_flags = 0;
9088         if (chk_length % 4) {
9089                 /* need pad */
9090                 uint32_t cpthis = 0;
9091                 int padlen;
9092
9093                 padlen = 4 - (chk_length % 4);
9094                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9095         }
9096         sctp_alloc_a_chunk(stcb, chk);
9097         if (chk == NULL) {
9098                 /* no memory */
9099                 sctp_m_freem(outchain);
9100                 return;
9101         }
9102         chk->copy_by_ref = 0;
9103         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9104         chk->rec.chunk_id.can_take_data = 1;
9105         chk->flags = 0;
9106         chk->send_size = chk_length;
9107         chk->sent = SCTP_DATAGRAM_UNSENT;
9108         chk->snd_count = 0;
9109         chk->asoc = &stcb->asoc;
9110         chk->data = outchain;
9111         chk->whoTo = net;
9112         atomic_add_int(&chk->whoTo->ref_count, 1);
9113         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9114         chk->asoc->ctrl_queue_cnt++;
9115 }
9116
9117 void
9118 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9119 {
9120         /* formulate and queue a cookie-ack back to sender */
9121         struct mbuf *cookie_ack;
9122         struct sctp_chunkhdr *hdr;
9123         struct sctp_tmit_chunk *chk;
9124
9125         SCTP_TCB_LOCK_ASSERT(stcb);
9126
9127         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9128         if (cookie_ack == NULL) {
9129                 /* no mbuf's */
9130                 return;
9131         }
9132         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9133         sctp_alloc_a_chunk(stcb, chk);
9134         if (chk == NULL) {
9135                 /* no memory */
9136                 sctp_m_freem(cookie_ack);
9137                 return;
9138         }
9139         chk->copy_by_ref = 0;
9140         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9141         chk->rec.chunk_id.can_take_data = 1;
9142         chk->flags = 0;
9143         chk->send_size = sizeof(struct sctp_chunkhdr);
9144         chk->sent = SCTP_DATAGRAM_UNSENT;
9145         chk->snd_count = 0;
9146         chk->asoc = &stcb->asoc;
9147         chk->data = cookie_ack;
9148         if (chk->asoc->last_control_chunk_from != NULL) {
9149                 chk->whoTo = chk->asoc->last_control_chunk_from;
9150                 atomic_add_int(&chk->whoTo->ref_count, 1);
9151         } else {
9152                 chk->whoTo = NULL;
9153         }
9154         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9155         hdr->chunk_type = SCTP_COOKIE_ACK;
9156         hdr->chunk_flags = 0;
9157         hdr->chunk_length = htons(chk->send_size);
9158         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9159         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9160         chk->asoc->ctrl_queue_cnt++;
9161         return;
9162 }
9163
9164
9165 void
9166 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9167 {
9168         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9169         struct mbuf *m_shutdown_ack;
9170         struct sctp_shutdown_ack_chunk *ack_cp;
9171         struct sctp_tmit_chunk *chk;
9172
9173         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9174         if (m_shutdown_ack == NULL) {
9175                 /* no mbuf's */
9176                 return;
9177         }
9178         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9179         sctp_alloc_a_chunk(stcb, chk);
9180         if (chk == NULL) {
9181                 /* no memory */
9182                 sctp_m_freem(m_shutdown_ack);
9183                 return;
9184         }
9185         chk->copy_by_ref = 0;
9186         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9187         chk->rec.chunk_id.can_take_data = 1;
9188         chk->flags = 0;
9189         chk->send_size = sizeof(struct sctp_chunkhdr);
9190         chk->sent = SCTP_DATAGRAM_UNSENT;
9191         chk->snd_count = 0;
9192         chk->flags = 0;
9193         chk->asoc = &stcb->asoc;
9194         chk->data = m_shutdown_ack;
9195         chk->whoTo = net;
9196         if (chk->whoTo) {
9197                 atomic_add_int(&chk->whoTo->ref_count, 1);
9198         }
9199         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9200         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9201         ack_cp->ch.chunk_flags = 0;
9202         ack_cp->ch.chunk_length = htons(chk->send_size);
9203         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9204         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9205         chk->asoc->ctrl_queue_cnt++;
9206         return;
9207 }
9208
9209 void
9210 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9211 {
9212         /* formulate and queue a SHUTDOWN to the sender */
9213         struct mbuf *m_shutdown;
9214         struct sctp_shutdown_chunk *shutdown_cp;
9215         struct sctp_tmit_chunk *chk;
9216
9217         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9218                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9219                         /* We already have a SHUTDOWN queued. Reuse it. */
9220                         if (chk->whoTo) {
9221                                 sctp_free_remote_addr(chk->whoTo);
9222                                 chk->whoTo = NULL;
9223                         }
9224                         break;
9225                 }
9226         }
9227         if (chk == NULL) {
9228                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9229                 if (m_shutdown == NULL) {
9230                         /* no mbuf's */
9231                         return;
9232                 }
9233                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9234                 sctp_alloc_a_chunk(stcb, chk);
9235                 if (chk == NULL) {
9236                         /* no memory */
9237                         sctp_m_freem(m_shutdown);
9238                         return;
9239                 }
9240                 chk->copy_by_ref = 0;
9241                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9242                 chk->rec.chunk_id.can_take_data = 1;
9243                 chk->flags = 0;
9244                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9245                 chk->sent = SCTP_DATAGRAM_UNSENT;
9246                 chk->snd_count = 0;
9247                 chk->flags = 0;
9248                 chk->asoc = &stcb->asoc;
9249                 chk->data = m_shutdown;
9250                 chk->whoTo = net;
9251                 if (chk->whoTo) {
9252                         atomic_add_int(&chk->whoTo->ref_count, 1);
9253                 }
9254                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9255                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9256                 shutdown_cp->ch.chunk_flags = 0;
9257                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9258                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9259                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9260                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9261                 chk->asoc->ctrl_queue_cnt++;
9262         } else {
9263                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9264                 chk->whoTo = net;
9265                 if (chk->whoTo) {
9266                         atomic_add_int(&chk->whoTo->ref_count, 1);
9267                 }
9268                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9269                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9270                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9271         }
9272         return;
9273 }
9274
9275 void
9276 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9277 {
9278         /*
9279          * formulate and queue an ASCONF to the peer. ASCONF parameters
9280          * should be queued on the assoc queue.
9281          */
9282         struct sctp_tmit_chunk *chk;
9283         struct mbuf *m_asconf;
9284         int len;
9285
9286         SCTP_TCB_LOCK_ASSERT(stcb);
9287
9288         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9289             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9290                 /* can't send a new one if there is one in flight already */
9291                 return;
9292         }
9293
9294         /* compose an ASCONF chunk, maximum length is PMTU */
9295         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9296         if (m_asconf == NULL) {
9297                 return;
9298         }
9299
9300         sctp_alloc_a_chunk(stcb, chk);
9301         if (chk == NULL) {
9302                 /* no memory */
9303                 sctp_m_freem(m_asconf);
9304                 return;
9305         }
9306
9307         chk->copy_by_ref = 0;
9308         chk->rec.chunk_id.id = SCTP_ASCONF;
9309         chk->rec.chunk_id.can_take_data = 0;
9310         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9311         chk->data = m_asconf;
9312         chk->send_size = len;
9313         chk->sent = SCTP_DATAGRAM_UNSENT;
9314         chk->snd_count = 0;
9315         chk->asoc = &stcb->asoc;
9316         chk->whoTo = net;
9317         if (chk->whoTo) {
9318                 atomic_add_int(&chk->whoTo->ref_count, 1);
9319         }
9320         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9321         chk->asoc->ctrl_queue_cnt++;
9322         return;
9323 }
9324
9325 void
9326 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9327 {
9328         /*
9329          * formulate and queue a asconf-ack back to sender. the asconf-ack
9330          * must be stored in the tcb.
9331          */
9332         struct sctp_tmit_chunk *chk;
9333         struct sctp_asconf_ack *ack, *latest_ack;
9334         struct mbuf *m_ack;
9335         struct sctp_nets *net = NULL;
9336
9337         SCTP_TCB_LOCK_ASSERT(stcb);
9338         /* Get the latest ASCONF-ACK */
9339         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9340         if (latest_ack == NULL) {
9341                 return;
9342         }
9343         if (latest_ack->last_sent_to != NULL &&
9344             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9345                 /* we're doing a retransmission */
9346                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9347                 if (net == NULL) {
9348                         /* no alternate */
9349                         if (stcb->asoc.last_control_chunk_from == NULL) {
9350                                 if (stcb->asoc.alternate) {
9351                                         net = stcb->asoc.alternate;
9352                                 } else {
9353                                         net = stcb->asoc.primary_destination;
9354                                 }
9355                         } else {
9356                                 net = stcb->asoc.last_control_chunk_from;
9357                         }
9358                 }
9359         } else {
9360                 /* normal case */
9361                 if (stcb->asoc.last_control_chunk_from == NULL) {
9362                         if (stcb->asoc.alternate) {
9363                                 net = stcb->asoc.alternate;
9364                         } else {
9365                                 net = stcb->asoc.primary_destination;
9366                         }
9367                 } else {
9368                         net = stcb->asoc.last_control_chunk_from;
9369                 }
9370         }
9371         latest_ack->last_sent_to = net;
9372
9373         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9374                 if (ack->data == NULL) {
9375                         continue;
9376                 }
9377
9378                 /* copy the asconf_ack */
9379                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9380                 if (m_ack == NULL) {
9381                         /* couldn't copy it */
9382                         return;
9383                 }
9384 #ifdef SCTP_MBUF_LOGGING
9385                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9386                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9387                 }
9388 #endif
9389
9390                 sctp_alloc_a_chunk(stcb, chk);
9391                 if (chk == NULL) {
9392                         /* no memory */
9393                         if (m_ack)
9394                                 sctp_m_freem(m_ack);
9395                         return;
9396                 }
9397                 chk->copy_by_ref = 0;
9398                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9399                 chk->rec.chunk_id.can_take_data = 1;
9400                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9401                 chk->whoTo = net;
9402                 if (chk->whoTo) {
9403                         atomic_add_int(&chk->whoTo->ref_count, 1);
9404                 }
9405                 chk->data = m_ack;
9406                 chk->send_size = ack->len;
9407                 chk->sent = SCTP_DATAGRAM_UNSENT;
9408                 chk->snd_count = 0;
9409                 chk->asoc = &stcb->asoc;
9410
9411                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9412                 chk->asoc->ctrl_queue_cnt++;
9413         }
9414         return;
9415 }
9416
9417
9418 static int
9419 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9420     struct sctp_tcb *stcb,
9421     struct sctp_association *asoc,
9422     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9423 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9424     SCTP_UNUSED
9425 #endif
9426 )
9427 {
9428         /*-
9429          * send out one MTU of retransmission. If fast_retransmit is
9430          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9431          * rwnd. For a Cookie or Asconf in the control chunk queue we
9432          * retransmit them by themselves.
9433          *
9434          * For data chunks we will pick out the lowest TSN's in the sent_queue
9435          * marked for resend and bundle them all together (up to a MTU of
9436          * destination). The address to send to should have been
9437          * selected/changed where the retransmission was marked (i.e. in FR
9438          * or t3-timeout routines).
9439          */
9440         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9441         struct sctp_tmit_chunk *chk, *fwd;
9442         struct mbuf *m, *endofchain;
9443         struct sctp_nets *net = NULL;
9444         uint32_t tsns_sent = 0;
9445         int no_fragmentflg, bundle_at, cnt_thru;
9446         unsigned int mtu;
9447         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9448         struct sctp_auth_chunk *auth = NULL;
9449         uint32_t auth_offset = 0;
9450         uint16_t auth_keyid;
9451         int override_ok = 1;
9452         int data_auth_reqd = 0;
9453         uint32_t dmtu = 0;
9454
9455         SCTP_TCB_LOCK_ASSERT(stcb);
9456         tmr_started = ctl_cnt = bundle_at = error = 0;
9457         no_fragmentflg = 1;
9458         fwd_tsn = 0;
9459         *cnt_out = 0;
9460         fwd = NULL;
9461         endofchain = m = NULL;
9462         auth_keyid = stcb->asoc.authinfo.active_keyid;
9463 #ifdef SCTP_AUDITING_ENABLED
9464         sctp_audit_log(0xC3, 1);
9465 #endif
9466         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9467             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9468                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9469                     asoc->sent_queue_retran_cnt);
9470                 asoc->sent_queue_cnt = 0;
9471                 asoc->sent_queue_cnt_removeable = 0;
9472                 /* send back 0/0 so we enter normal transmission */
9473                 *cnt_out = 0;
9474                 return (0);
9475         }
9476         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9477                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9478                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9479                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9480                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9481                                 continue;
9482                         }
9483                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9484                                 if (chk != asoc->str_reset) {
9485                                         /*
9486                                          * not eligible for retran if its
9487                                          * not ours
9488                                          */
9489                                         continue;
9490                                 }
9491                         }
9492                         ctl_cnt++;
9493                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9494                                 fwd_tsn = 1;
9495                         }
9496                         /*
9497                          * Add an AUTH chunk, if chunk requires it save the
9498                          * offset into the chain for AUTH
9499                          */
9500                         if ((auth == NULL) &&
9501                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9502                             stcb->asoc.peer_auth_chunks))) {
9503                                 m = sctp_add_auth_chunk(m, &endofchain,
9504                                     &auth, &auth_offset,
9505                                     stcb,
9506                                     chk->rec.chunk_id.id);
9507                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9508                         }
9509                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9510                         break;
9511                 }
9512         }
9513         one_chunk = 0;
9514         cnt_thru = 0;
9515         /* do we have control chunks to retransmit? */
9516         if (m != NULL) {
9517                 /* Start a timer no matter if we succeed or fail */
9518                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9519                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9520                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9521                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9522                 chk->snd_count++;       /* update our count */
9523                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9524                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9525                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9526                     no_fragmentflg, 0, 0,
9527                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9528                     chk->whoTo->port, NULL,
9529                     0, 0,
9530                     so_locked))) {
9531                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9532                         if (error == ENOBUFS) {
9533                                 asoc->ifp_had_enobuf = 1;
9534                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9535                         }
9536                         return (error);
9537                 } else {
9538                         asoc->ifp_had_enobuf = 0;
9539                 }
9540                 endofchain = NULL;
9541                 auth = NULL;
9542                 auth_offset = 0;
9543                 /*
9544                  * We don't want to mark the net->sent time here since this
9545                  * we use this for HB and retrans cannot measure RTT
9546                  */
9547                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9548                 *cnt_out += 1;
9549                 chk->sent = SCTP_DATAGRAM_SENT;
9550                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9551                 if (fwd_tsn == 0) {
9552                         return (0);
9553                 } else {
9554                         /* Clean up the fwd-tsn list */
9555                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9556                         return (0);
9557                 }
9558         }
9559         /*
9560          * Ok, it is just data retransmission we need to do or that and a
9561          * fwd-tsn with it all.
9562          */
9563         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9564                 return (SCTP_RETRAN_DONE);
9565         }
9566         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9567             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9568                 /* not yet open, resend the cookie and that is it */
9569                 return (1);
9570         }
9571 #ifdef SCTP_AUDITING_ENABLED
9572         sctp_auditing(20, inp, stcb, NULL);
9573 #endif
9574         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9575         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9576                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9577                         /* No, not sent to this net or not ready for rtx */
9578                         continue;
9579                 }
9580                 if (chk->data == NULL) {
9581                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9582                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9583                         continue;
9584                 }
9585                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9586                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9587                         struct mbuf *op_err;
9588                         char msg[SCTP_DIAG_INFO_LEN];
9589
9590                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9591                             chk->rec.data.tsn, chk->snd_count);
9592                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9593                             msg);
9594                         atomic_add_int(&stcb->asoc.refcnt, 1);
9595                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9596                             so_locked);
9597                         SCTP_TCB_LOCK(stcb);
9598                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9599                         return (SCTP_RETRAN_EXIT);
9600                 }
9601                 /* pick up the net */
9602                 net = chk->whoTo;
9603                 switch (net->ro._l_addr.sa.sa_family) {
9604 #ifdef INET
9605                 case AF_INET:
9606                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9607                         break;
9608 #endif
9609 #ifdef INET6
9610                 case AF_INET6:
9611                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9612                         break;
9613 #endif
9614                 default:
9615                         /* TSNH */
9616                         mtu = net->mtu;
9617                         break;
9618                 }
9619
9620                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9621                         /* No room in peers rwnd */
9622                         uint32_t tsn;
9623
9624                         tsn = asoc->last_acked_seq + 1;
9625                         if (tsn == chk->rec.data.tsn) {
9626                                 /*
9627                                  * we make a special exception for this
9628                                  * case. The peer has no rwnd but is missing
9629                                  * the lowest chunk.. which is probably what
9630                                  * is holding up the rwnd.
9631                                  */
9632                                 goto one_chunk_around;
9633                         }
9634                         return (1);
9635                 }
9636 one_chunk_around:
9637                 if (asoc->peers_rwnd < mtu) {
9638                         one_chunk = 1;
9639                         if ((asoc->peers_rwnd == 0) &&
9640                             (asoc->total_flight == 0)) {
9641                                 chk->window_probe = 1;
9642                                 chk->whoTo->window_probe = 1;
9643                         }
9644                 }
9645 #ifdef SCTP_AUDITING_ENABLED
9646                 sctp_audit_log(0xC3, 2);
9647 #endif
9648                 bundle_at = 0;
9649                 m = NULL;
9650                 net->fast_retran_ip = 0;
9651                 if (chk->rec.data.doing_fast_retransmit == 0) {
9652                         /*
9653                          * if no FR in progress skip destination that have
9654                          * flight_size > cwnd.
9655                          */
9656                         if (net->flight_size >= net->cwnd) {
9657                                 continue;
9658                         }
9659                 } else {
9660                         /*
9661                          * Mark the destination net to have FR recovery
9662                          * limits put on it.
9663                          */
9664                         *fr_done = 1;
9665                         net->fast_retran_ip = 1;
9666                 }
9667
9668                 /*
9669                  * if no AUTH is yet included and this chunk requires it,
9670                  * make sure to account for it.  We don't apply the size
9671                  * until the AUTH chunk is actually added below in case
9672                  * there is no room for this chunk.
9673                  */
9674                 if (data_auth_reqd && (auth == NULL)) {
9675                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9676                 } else
9677                         dmtu = 0;
9678
9679                 if ((chk->send_size <= (mtu - dmtu)) ||
9680                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9681                         /* ok we will add this one */
9682                         if (data_auth_reqd) {
9683                                 if (auth == NULL) {
9684                                         m = sctp_add_auth_chunk(m,
9685                                             &endofchain,
9686                                             &auth,
9687                                             &auth_offset,
9688                                             stcb,
9689                                             SCTP_DATA);
9690                                         auth_keyid = chk->auth_keyid;
9691                                         override_ok = 0;
9692                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9693                                 } else if (override_ok) {
9694                                         auth_keyid = chk->auth_keyid;
9695                                         override_ok = 0;
9696                                 } else if (chk->auth_keyid != auth_keyid) {
9697                                         /* different keyid, so done bundling */
9698                                         break;
9699                                 }
9700                         }
9701                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9702                         if (m == NULL) {
9703                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9704                                 return (ENOMEM);
9705                         }
9706                         /* Do clear IP_DF ? */
9707                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9708                                 no_fragmentflg = 0;
9709                         }
9710                         /* upate our MTU size */
9711                         if (mtu > (chk->send_size + dmtu))
9712                                 mtu -= (chk->send_size + dmtu);
9713                         else
9714                                 mtu = 0;
9715                         data_list[bundle_at++] = chk;
9716                         if (one_chunk && (asoc->total_flight <= 0)) {
9717                                 SCTP_STAT_INCR(sctps_windowprobed);
9718                         }
9719                 }
9720                 if (one_chunk == 0) {
9721                         /*
9722                          * now are there anymore forward from chk to pick
9723                          * up?
9724                          */
9725                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9726                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9727                                         /* Nope, not for retran */
9728                                         continue;
9729                                 }
9730                                 if (fwd->whoTo != net) {
9731                                         /* Nope, not the net in question */
9732                                         continue;
9733                                 }
9734                                 if (data_auth_reqd && (auth == NULL)) {
9735                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9736                                 } else
9737                                         dmtu = 0;
9738                                 if (fwd->send_size <= (mtu - dmtu)) {
9739                                         if (data_auth_reqd) {
9740                                                 if (auth == NULL) {
9741                                                         m = sctp_add_auth_chunk(m,
9742                                                             &endofchain,
9743                                                             &auth,
9744                                                             &auth_offset,
9745                                                             stcb,
9746                                                             SCTP_DATA);
9747                                                         auth_keyid = fwd->auth_keyid;
9748                                                         override_ok = 0;
9749                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9750                                                 } else if (override_ok) {
9751                                                         auth_keyid = fwd->auth_keyid;
9752                                                         override_ok = 0;
9753                                                 } else if (fwd->auth_keyid != auth_keyid) {
9754                                                         /*
9755                                                          * different keyid,
9756                                                          * so done bundling
9757                                                          */
9758                                                         break;
9759                                                 }
9760                                         }
9761                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9762                                         if (m == NULL) {
9763                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9764                                                 return (ENOMEM);
9765                                         }
9766                                         /* Do clear IP_DF ? */
9767                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9768                                                 no_fragmentflg = 0;
9769                                         }
9770                                         /* upate our MTU size */
9771                                         if (mtu > (fwd->send_size + dmtu))
9772                                                 mtu -= (fwd->send_size + dmtu);
9773                                         else
9774                                                 mtu = 0;
9775                                         data_list[bundle_at++] = fwd;
9776                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9777                                                 break;
9778                                         }
9779                                 } else {
9780                                         /* can't fit so we are done */
9781                                         break;
9782                                 }
9783                         }
9784                 }
9785                 /* Is there something to send for this destination? */
9786                 if (m) {
9787                         /*
9788                          * No matter if we fail/or succeed we should start a
9789                          * timer. A failure is like a lost IP packet :-)
9790                          */
9791                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9792                                 /*
9793                                  * no timer running on this destination
9794                                  * restart it.
9795                                  */
9796                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9797                                 tmr_started = 1;
9798                         }
9799                         /* Now lets send it, if there is anything to send :> */
9800                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9801                             (struct sockaddr *)&net->ro._l_addr, m,
9802                             auth_offset, auth, auth_keyid,
9803                             no_fragmentflg, 0, 0,
9804                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9805                             net->port, NULL,
9806                             0, 0,
9807                             so_locked))) {
9808                                 /* error, we could not output */
9809                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9810                                 if (error == ENOBUFS) {
9811                                         asoc->ifp_had_enobuf = 1;
9812                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9813                                 }
9814                                 return (error);
9815                         } else {
9816                                 asoc->ifp_had_enobuf = 0;
9817                         }
9818                         endofchain = NULL;
9819                         auth = NULL;
9820                         auth_offset = 0;
9821                         /* For HB's */
9822                         /*
9823                          * We don't want to mark the net->sent time here
9824                          * since this we use this for HB and retrans cannot
9825                          * measure RTT
9826                          */
9827                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9828
9829                         /* For auto-close */
9830                         cnt_thru++;
9831                         if (*now_filled == 0) {
9832                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9833                                 *now = asoc->time_last_sent;
9834                                 *now_filled = 1;
9835                         } else {
9836                                 asoc->time_last_sent = *now;
9837                         }
9838                         *cnt_out += bundle_at;
9839 #ifdef SCTP_AUDITING_ENABLED
9840                         sctp_audit_log(0xC4, bundle_at);
9841 #endif
9842                         if (bundle_at) {
9843                                 tsns_sent = data_list[0]->rec.data.tsn;
9844                         }
9845                         for (i = 0; i < bundle_at; i++) {
9846                                 SCTP_STAT_INCR(sctps_sendretransdata);
9847                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9848                                 /*
9849                                  * When we have a revoked data, and we
9850                                  * retransmit it, then we clear the revoked
9851                                  * flag since this flag dictates if we
9852                                  * subtracted from the fs
9853                                  */
9854                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9855                                         /* Deflate the cwnd */
9856                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9857                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9858                                 }
9859                                 data_list[i]->snd_count++;
9860                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9861                                 /* record the time */
9862                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9863                                 if (data_list[i]->book_size_scale) {
9864                                         /*
9865                                          * need to double the book size on
9866                                          * this one
9867                                          */
9868                                         data_list[i]->book_size_scale = 0;
9869                                         /*
9870                                          * Since we double the booksize, we
9871                                          * must also double the output queue
9872                                          * size, since this get shrunk when
9873                                          * we free by this amount.
9874                                          */
9875                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9876                                         data_list[i]->book_size *= 2;
9877
9878
9879                                 } else {
9880                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9881                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9882                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9883                                         }
9884                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9885                                             (uint32_t)(data_list[i]->send_size +
9886                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9887                                 }
9888                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9889                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9890                                             data_list[i]->whoTo->flight_size,
9891                                             data_list[i]->book_size,
9892                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9893                                             data_list[i]->rec.data.tsn);
9894                                 }
9895                                 sctp_flight_size_increase(data_list[i]);
9896                                 sctp_total_flight_increase(stcb, data_list[i]);
9897                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9898                                         /* SWS sender side engages */
9899                                         asoc->peers_rwnd = 0;
9900                                 }
9901                                 if ((i == 0) &&
9902                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9903                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9904                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9905                                             (tmr_started == 0)) {
9906                                                 /*-
9907                                                  * ok we just fast-retrans'd
9908                                                  * the lowest TSN, i.e the
9909                                                  * first on the list. In
9910                                                  * this case we want to give
9911                                                  * some more time to get a
9912                                                  * SACK back without a
9913                                                  * t3-expiring.
9914                                                  */
9915                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9916                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9917                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9918                                         }
9919                                 }
9920                         }
9921                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9922                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9923                         }
9924 #ifdef SCTP_AUDITING_ENABLED
9925                         sctp_auditing(21, inp, stcb, NULL);
9926 #endif
9927                 } else {
9928                         /* None will fit */
9929                         return (1);
9930                 }
9931                 if (asoc->sent_queue_retran_cnt <= 0) {
9932                         /* all done we have no more to retran */
9933                         asoc->sent_queue_retran_cnt = 0;
9934                         break;
9935                 }
9936                 if (one_chunk) {
9937                         /* No more room in rwnd */
9938                         return (1);
9939                 }
9940                 /* stop the for loop here. we sent out a packet */
9941                 break;
9942         }
9943         return (0);
9944 }
9945
9946 static void
9947 sctp_timer_validation(struct sctp_inpcb *inp,
9948     struct sctp_tcb *stcb,
9949     struct sctp_association *asoc)
9950 {
9951         struct sctp_nets *net;
9952
9953         /* Validate that a timer is running somewhere */
9954         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9955                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9956                         /* Here is a timer */
9957                         return;
9958                 }
9959         }
9960         SCTP_TCB_LOCK_ASSERT(stcb);
9961         /* Gak, we did not have a timer somewhere */
9962         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9963         if (asoc->alternate) {
9964                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9965         } else {
9966                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9967         }
9968         return;
9969 }
9970
9971 void
9972 sctp_chunk_output(struct sctp_inpcb *inp,
9973     struct sctp_tcb *stcb,
9974     int from_where,
9975     int so_locked
9976 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9977     SCTP_UNUSED
9978 #endif
9979 )
9980 {
9981         /*-
9982          * Ok this is the generic chunk service queue. we must do the
9983          * following:
9984          * - See if there are retransmits pending, if so we must
9985          *   do these first.
9986          * - Service the stream queue that is next, moving any
9987          *   message (note I must get a complete message i.e.
9988          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9989          *   TSN's
9990          * - Check to see if the cwnd/rwnd allows any output, if so we
9991          *   go ahead and fomulate and send the low level chunks. Making sure
9992          *   to combine any control in the control chunk queue also.
9993          */
9994         struct sctp_association *asoc;
9995         struct sctp_nets *net;
9996         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9997         unsigned int burst_cnt = 0;
9998         struct timeval now;
9999         int now_filled = 0;
10000         int nagle_on;
10001         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10002         int un_sent = 0;
10003         int fr_done;
10004         unsigned int tot_frs = 0;
10005
10006         asoc = &stcb->asoc;
10007 do_it_again:
10008         /* The Nagle algorithm is only applied when handling a send call. */
10009         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10010                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10011                         nagle_on = 0;
10012                 } else {
10013                         nagle_on = 1;
10014                 }
10015         } else {
10016                 nagle_on = 0;
10017         }
10018         SCTP_TCB_LOCK_ASSERT(stcb);
10019
10020         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10021
10022         if ((un_sent <= 0) &&
10023             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10024             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10025             (asoc->sent_queue_retran_cnt == 0) &&
10026             (asoc->trigger_reset == 0)) {
10027                 /* Nothing to do unless there is something to be sent left */
10028                 return;
10029         }
10030         /*
10031          * Do we have something to send, data or control AND a sack timer
10032          * running, if so piggy-back the sack.
10033          */
10034         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10035                 sctp_send_sack(stcb, so_locked);
10036                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10037         }
10038         while (asoc->sent_queue_retran_cnt) {
10039                 /*-
10040                  * Ok, it is retransmission time only, we send out only ONE
10041                  * packet with a single call off to the retran code.
10042                  */
10043                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10044                         /*-
10045                          * Special hook for handling cookiess discarded
10046                          * by peer that carried data. Send cookie-ack only
10047                          * and then the next call with get the retran's.
10048                          */
10049                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10050                             from_where,
10051                             &now, &now_filled, frag_point, so_locked);
10052                         return;
10053                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10054                         /* if its not from a HB then do it */
10055                         fr_done = 0;
10056                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10057                         if (fr_done) {
10058                                 tot_frs++;
10059                         }
10060                 } else {
10061                         /*
10062                          * its from any other place, we don't allow retran
10063                          * output (only control)
10064                          */
10065                         ret = 1;
10066                 }
10067                 if (ret > 0) {
10068                         /* Can't send anymore */
10069                         /*-
10070                          * now lets push out control by calling med-level
10071                          * output once. this assures that we WILL send HB's
10072                          * if queued too.
10073                          */
10074                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10075                             from_where,
10076                             &now, &now_filled, frag_point, so_locked);
10077 #ifdef SCTP_AUDITING_ENABLED
10078                         sctp_auditing(8, inp, stcb, NULL);
10079 #endif
10080                         sctp_timer_validation(inp, stcb, asoc);
10081                         return;
10082                 }
10083                 if (ret < 0) {
10084                         /*-
10085                          * The count was off.. retran is not happening so do
10086                          * the normal retransmission.
10087                          */
10088 #ifdef SCTP_AUDITING_ENABLED
10089                         sctp_auditing(9, inp, stcb, NULL);
10090 #endif
10091                         if (ret == SCTP_RETRAN_EXIT) {
10092                                 return;
10093                         }
10094                         break;
10095                 }
10096                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10097                         /* Only one transmission allowed out of a timeout */
10098 #ifdef SCTP_AUDITING_ENABLED
10099                         sctp_auditing(10, inp, stcb, NULL);
10100 #endif
10101                         /* Push out any control */
10102                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10103                             &now, &now_filled, frag_point, so_locked);
10104                         return;
10105                 }
10106                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10107                         /* Hit FR burst limit */
10108                         return;
10109                 }
10110                 if ((num_out == 0) && (ret == 0)) {
10111                         /* No more retrans to send */
10112                         break;
10113                 }
10114         }
10115 #ifdef SCTP_AUDITING_ENABLED
10116         sctp_auditing(12, inp, stcb, NULL);
10117 #endif
10118         /* Check for bad destinations, if they exist move chunks around. */
10119         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10120                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10121                         /*-
10122                          * if possible move things off of this address we
10123                          * still may send below due to the dormant state but
10124                          * we try to find an alternate address to send to
10125                          * and if we have one we move all queued data on the
10126                          * out wheel to this alternate address.
10127                          */
10128                         if (net->ref_count > 1)
10129                                 sctp_move_chunks_from_net(stcb, net);
10130                 } else {
10131                         /*-
10132                          * if ((asoc->sat_network) || (net->addr_is_local))
10133                          * { burst_limit = asoc->max_burst *
10134                          * SCTP_SAT_NETWORK_BURST_INCR; }
10135                          */
10136                         if (asoc->max_burst > 0) {
10137                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10138                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10139                                                 /*
10140                                                  * JRS - Use the congestion
10141                                                  * control given in the
10142                                                  * congestion control module
10143                                                  */
10144                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10145                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10146                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10147                                                 }
10148                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10149                                         }
10150                                         net->fast_retran_ip = 0;
10151                                 } else {
10152                                         if (net->flight_size == 0) {
10153                                                 /*
10154                                                  * Should be decaying the
10155                                                  * cwnd here
10156                                                  */
10157                                                 ;
10158                                         }
10159                                 }
10160                         }
10161                 }
10162
10163         }
10164         burst_cnt = 0;
10165         do {
10166                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10167                     &reason_code, 0, from_where,
10168                     &now, &now_filled, frag_point, so_locked);
10169                 if (error) {
10170                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10171                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10172                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10173                         }
10174                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10175                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10176                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10177                         }
10178                         break;
10179                 }
10180                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10181
10182                 tot_out += num_out;
10183                 burst_cnt++;
10184                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10185                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10186                         if (num_out == 0) {
10187                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10188                         }
10189                 }
10190                 if (nagle_on) {
10191                         /*
10192                          * When the Nagle algorithm is used, look at how
10193                          * much is unsent, then if its smaller than an MTU
10194                          * and we have data in flight we stop, except if we
10195                          * are handling a fragmented user message.
10196                          */
10197                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10198                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10199                             (stcb->asoc.total_flight > 0)) {
10200 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10201                                 break;
10202                         }
10203                 }
10204                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10205                     TAILQ_EMPTY(&asoc->send_queue) &&
10206                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10207                         /* Nothing left to send */
10208                         break;
10209                 }
10210                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10211                         /* Nothing left to send */
10212                         break;
10213                 }
10214         } while (num_out &&
10215             ((asoc->max_burst == 0) ||
10216             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10217             (burst_cnt < asoc->max_burst)));
10218
10219         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10220                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10221                         SCTP_STAT_INCR(sctps_maxburstqueued);
10222                         asoc->burst_limit_applied = 1;
10223                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10224                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10225                         }
10226                 } else {
10227                         asoc->burst_limit_applied = 0;
10228                 }
10229         }
10230         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10231                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10232         }
10233         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10234             tot_out);
10235
10236         /*-
10237          * Now we need to clean up the control chunk chain if a ECNE is on
10238          * it. It must be marked as UNSENT again so next call will continue
10239          * to send it until such time that we get a CWR, to remove it.
10240          */
10241         if (stcb->asoc.ecn_echo_cnt_onq)
10242                 sctp_fix_ecn_echo(asoc);
10243
10244         if (stcb->asoc.trigger_reset) {
10245                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10246                         goto do_it_again;
10247                 }
10248         }
10249         return;
10250 }
10251
10252
10253 int
10254 sctp_output(
10255     struct sctp_inpcb *inp,
10256     struct mbuf *m,
10257     struct sockaddr *addr,
10258     struct mbuf *control,
10259     struct thread *p,
10260     int flags)
10261 {
10262         if (inp == NULL) {
10263                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10264                 return (EINVAL);
10265         }
10266
10267         if (inp->sctp_socket == NULL) {
10268                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10269                 return (EINVAL);
10270         }
10271         return (sctp_sosend(inp->sctp_socket,
10272             addr,
10273             (struct uio *)NULL,
10274             m,
10275             control,
10276             flags, p
10277             ));
10278 }
10279
10280 void
10281 send_forward_tsn(struct sctp_tcb *stcb,
10282     struct sctp_association *asoc)
10283 {
10284         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10285         struct sctp_forward_tsn_chunk *fwdtsn;
10286         struct sctp_strseq *strseq;
10287         struct sctp_strseq_mid *strseq_m;
10288         uint32_t advance_peer_ack_point;
10289         unsigned int cnt_of_space, i, ovh;
10290         unsigned int space_needed;
10291         unsigned int cnt_of_skipped = 0;
10292
10293         SCTP_TCB_LOCK_ASSERT(stcb);
10294         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10295                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10296                         /* mark it to unsent */
10297                         chk->sent = SCTP_DATAGRAM_UNSENT;
10298                         chk->snd_count = 0;
10299                         /* Do we correct its output location? */
10300                         if (chk->whoTo) {
10301                                 sctp_free_remote_addr(chk->whoTo);
10302                                 chk->whoTo = NULL;
10303                         }
10304                         goto sctp_fill_in_rest;
10305                 }
10306         }
10307         /* Ok if we reach here we must build one */
10308         sctp_alloc_a_chunk(stcb, chk);
10309         if (chk == NULL) {
10310                 return;
10311         }
10312         asoc->fwd_tsn_cnt++;
10313         chk->copy_by_ref = 0;
10314         /*
10315          * We don't do the old thing here since this is used not for on-wire
10316          * but to tell if we are sending a fwd-tsn by the stack during
10317          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10318          */
10319         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10320         chk->rec.chunk_id.can_take_data = 0;
10321         chk->flags = 0;
10322         chk->asoc = asoc;
10323         chk->whoTo = NULL;
10324         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10325         if (chk->data == NULL) {
10326                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10327                 return;
10328         }
10329         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10330         chk->sent = SCTP_DATAGRAM_UNSENT;
10331         chk->snd_count = 0;
10332         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10333         asoc->ctrl_queue_cnt++;
10334 sctp_fill_in_rest:
10335         /*-
10336          * Here we go through and fill out the part that deals with
10337          * stream/seq of the ones we skip.
10338          */
10339         SCTP_BUF_LEN(chk->data) = 0;
10340         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10341                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10342                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10343                         /* no more to look at */
10344                         break;
10345                 }
10346                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10347                         /* We don't report these */
10348                         continue;
10349                 }
10350                 cnt_of_skipped++;
10351         }
10352         if (asoc->idata_supported) {
10353                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10354                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10355         } else {
10356                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10357                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10358         }
10359         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10360
10361         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10362                 ovh = SCTP_MIN_OVERHEAD;
10363         } else {
10364                 ovh = SCTP_MIN_V4_OVERHEAD;
10365         }
10366         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10367                 /* trim to a mtu size */
10368                 cnt_of_space = asoc->smallest_mtu - ovh;
10369         }
10370         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10371                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10372                     0xff, 0, cnt_of_skipped,
10373                     asoc->advanced_peer_ack_point);
10374         }
10375         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10376         if (cnt_of_space < space_needed) {
10377                 /*-
10378                  * ok we must trim down the chunk by lowering the
10379                  * advance peer ack point.
10380                  */
10381                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10382                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10383                             0xff, 0xff, cnt_of_space,
10384                             space_needed);
10385                 }
10386                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10387                 if (asoc->idata_supported) {
10388                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10389                 } else {
10390                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10391                 }
10392                 /*-
10393                  * Go through and find the TSN that will be the one
10394                  * we report.
10395                  */
10396                 at = TAILQ_FIRST(&asoc->sent_queue);
10397                 if (at != NULL) {
10398                         for (i = 0; i < cnt_of_skipped; i++) {
10399                                 tp1 = TAILQ_NEXT(at, sctp_next);
10400                                 if (tp1 == NULL) {
10401                                         break;
10402                                 }
10403                                 at = tp1;
10404                         }
10405                 }
10406                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10407                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10408                             0xff, cnt_of_skipped, at->rec.data.tsn,
10409                             asoc->advanced_peer_ack_point);
10410                 }
10411                 last = at;
10412                 /*-
10413                  * last now points to last one I can report, update
10414                  * peer ack point
10415                  */
10416                 if (last) {
10417                         advance_peer_ack_point = last->rec.data.tsn;
10418                 }
10419                 if (asoc->idata_supported) {
10420                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10421                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10422                 } else {
10423                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10424                             cnt_of_skipped * sizeof(struct sctp_strseq);
10425                 }
10426         }
10427         chk->send_size = space_needed;
10428         /* Setup the chunk */
10429         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10430         fwdtsn->ch.chunk_length = htons(chk->send_size);
10431         fwdtsn->ch.chunk_flags = 0;
10432         if (asoc->idata_supported) {
10433                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10434         } else {
10435                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10436         }
10437         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10438         SCTP_BUF_LEN(chk->data) = chk->send_size;
10439         fwdtsn++;
10440         /*-
10441          * Move pointer to after the fwdtsn and transfer to the
10442          * strseq pointer.
10443          */
10444         if (asoc->idata_supported) {
10445                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10446                 strseq = NULL;
10447         } else {
10448                 strseq = (struct sctp_strseq *)fwdtsn;
10449                 strseq_m = NULL;
10450         }
10451         /*-
10452          * Now populate the strseq list. This is done blindly
10453          * without pulling out duplicate stream info. This is
10454          * inefficent but won't harm the process since the peer will
10455          * look at these in sequence and will thus release anything.
10456          * It could mean we exceed the PMTU and chop off some that
10457          * we could have included.. but this is unlikely (aka 1432/4
10458          * would mean 300+ stream seq's would have to be reported in
10459          * one FWD-TSN. With a bit of work we can later FIX this to
10460          * optimize and pull out duplicates.. but it does add more
10461          * overhead. So for now... not!
10462          */
10463         i = 0;
10464         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10465                 if (i >= cnt_of_skipped) {
10466                         break;
10467                 }
10468                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10469                         /* We don't report these */
10470                         continue;
10471                 }
10472                 if (at->rec.data.tsn == advance_peer_ack_point) {
10473                         at->rec.data.fwd_tsn_cnt = 0;
10474                 }
10475                 if (asoc->idata_supported) {
10476                         strseq_m->sid = htons(at->rec.data.sid);
10477                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10478                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10479                         } else {
10480                                 strseq_m->flags = 0;
10481                         }
10482                         strseq_m->mid = htonl(at->rec.data.mid);
10483                         strseq_m++;
10484                 } else {
10485                         strseq->sid = htons(at->rec.data.sid);
10486                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10487                         strseq++;
10488                 }
10489                 i++;
10490         }
10491         return;
10492 }
10493
10494 void
10495 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10496 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10497     SCTP_UNUSED
10498 #endif
10499 )
10500 {
10501         /*-
10502          * Queue up a SACK or NR-SACK in the control queue.
10503          * We must first check to see if a SACK or NR-SACK is
10504          * somehow on the control queue.
10505          * If so, we will take and and remove the old one.
10506          */
10507         struct sctp_association *asoc;
10508         struct sctp_tmit_chunk *chk, *a_chk;
10509         struct sctp_sack_chunk *sack;
10510         struct sctp_nr_sack_chunk *nr_sack;
10511         struct sctp_gap_ack_block *gap_descriptor;
10512         const struct sack_track *selector;
10513         int mergeable = 0;
10514         int offset;
10515         caddr_t limit;
10516         uint32_t *dup;
10517         int limit_reached = 0;
10518         unsigned int i, siz, j;
10519         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10520         int num_dups = 0;
10521         int space_req;
10522         uint32_t highest_tsn;
10523         uint8_t flags;
10524         uint8_t type;
10525         uint8_t tsn_map;
10526
10527         if (stcb->asoc.nrsack_supported == 1) {
10528                 type = SCTP_NR_SELECTIVE_ACK;
10529         } else {
10530                 type = SCTP_SELECTIVE_ACK;
10531         }
10532         a_chk = NULL;
10533         asoc = &stcb->asoc;
10534         SCTP_TCB_LOCK_ASSERT(stcb);
10535         if (asoc->last_data_chunk_from == NULL) {
10536                 /* Hmm we never received anything */
10537                 return;
10538         }
10539         sctp_slide_mapping_arrays(stcb);
10540         sctp_set_rwnd(stcb, asoc);
10541         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10542                 if (chk->rec.chunk_id.id == type) {
10543                         /* Hmm, found a sack already on queue, remove it */
10544                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10545                         asoc->ctrl_queue_cnt--;
10546                         a_chk = chk;
10547                         if (a_chk->data) {
10548                                 sctp_m_freem(a_chk->data);
10549                                 a_chk->data = NULL;
10550                         }
10551                         if (a_chk->whoTo) {
10552                                 sctp_free_remote_addr(a_chk->whoTo);
10553                                 a_chk->whoTo = NULL;
10554                         }
10555                         break;
10556                 }
10557         }
10558         if (a_chk == NULL) {
10559                 sctp_alloc_a_chunk(stcb, a_chk);
10560                 if (a_chk == NULL) {
10561                         /* No memory so we drop the idea, and set a timer */
10562                         if (stcb->asoc.delayed_ack) {
10563                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10564                                     stcb->sctp_ep, stcb, NULL,
10565                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10566                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10567                                     stcb->sctp_ep, stcb, NULL);
10568                         } else {
10569                                 stcb->asoc.send_sack = 1;
10570                         }
10571                         return;
10572                 }
10573                 a_chk->copy_by_ref = 0;
10574                 a_chk->rec.chunk_id.id = type;
10575                 a_chk->rec.chunk_id.can_take_data = 1;
10576         }
10577         /* Clear our pkt counts */
10578         asoc->data_pkts_seen = 0;
10579
10580         a_chk->flags = 0;
10581         a_chk->asoc = asoc;
10582         a_chk->snd_count = 0;
10583         a_chk->send_size = 0;   /* fill in later */
10584         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10585         a_chk->whoTo = NULL;
10586
10587         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10588                 /*-
10589                  * Ok, the destination for the SACK is unreachable, lets see if
10590                  * we can select an alternate to asoc->last_data_chunk_from
10591                  */
10592                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10593                 if (a_chk->whoTo == NULL) {
10594                         /* Nope, no alternate */
10595                         a_chk->whoTo = asoc->last_data_chunk_from;
10596                 }
10597         } else {
10598                 a_chk->whoTo = asoc->last_data_chunk_from;
10599         }
10600         if (a_chk->whoTo) {
10601                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10602         }
10603         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10604                 highest_tsn = asoc->highest_tsn_inside_map;
10605         } else {
10606                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10607         }
10608         if (highest_tsn == asoc->cumulative_tsn) {
10609                 /* no gaps */
10610                 if (type == SCTP_SELECTIVE_ACK) {
10611                         space_req = sizeof(struct sctp_sack_chunk);
10612                 } else {
10613                         space_req = sizeof(struct sctp_nr_sack_chunk);
10614                 }
10615         } else {
10616                 /* gaps get a cluster */
10617                 space_req = MCLBYTES;
10618         }
10619         /* Ok now lets formulate a MBUF with our sack */
10620         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10621         if ((a_chk->data == NULL) ||
10622             (a_chk->whoTo == NULL)) {
10623                 /* rats, no mbuf memory */
10624                 if (a_chk->data) {
10625                         /* was a problem with the destination */
10626                         sctp_m_freem(a_chk->data);
10627                         a_chk->data = NULL;
10628                 }
10629                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10630                 /* sa_ignore NO_NULL_CHK */
10631                 if (stcb->asoc.delayed_ack) {
10632                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10633                             stcb->sctp_ep, stcb, NULL,
10634                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10635                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10636                             stcb->sctp_ep, stcb, NULL);
10637                 } else {
10638                         stcb->asoc.send_sack = 1;
10639                 }
10640                 return;
10641         }
10642         /* ok, lets go through and fill it in */
10643         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10644         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10645         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10646                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10647         }
10648         limit = mtod(a_chk->data, caddr_t);
10649         limit += space;
10650
10651         flags = 0;
10652
10653         if ((asoc->sctp_cmt_on_off > 0) &&
10654             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10655                 /*-
10656                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10657                  * received, then set high bit to 1, else 0. Reset
10658                  * pkts_rcvd.
10659                  */
10660                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10661                 asoc->cmt_dac_pkts_rcvd = 0;
10662         }
10663 #ifdef SCTP_ASOCLOG_OF_TSNS
10664         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10665         stcb->asoc.cumack_log_atsnt++;
10666         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10667                 stcb->asoc.cumack_log_atsnt = 0;
10668         }
10669 #endif
10670         /* reset the readers interpretation */
10671         stcb->freed_by_sorcv_sincelast = 0;
10672
10673         if (type == SCTP_SELECTIVE_ACK) {
10674                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10675                 nr_sack = NULL;
10676                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10677                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10678                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10679                 } else {
10680                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10681                 }
10682         } else {
10683                 sack = NULL;
10684                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10685                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10686                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10687                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10688                 } else {
10689                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10690                 }
10691         }
10692
10693         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10694                 offset = 1;
10695         } else {
10696                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10697         }
10698         if (((type == SCTP_SELECTIVE_ACK) &&
10699             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10700             ((type == SCTP_NR_SELECTIVE_ACK) &&
10701             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10702                 /* we have a gap .. maybe */
10703                 for (i = 0; i < siz; i++) {
10704                         tsn_map = asoc->mapping_array[i];
10705                         if (type == SCTP_SELECTIVE_ACK) {
10706                                 tsn_map |= asoc->nr_mapping_array[i];
10707                         }
10708                         if (i == 0) {
10709                                 /*
10710                                  * Clear all bits corresponding to TSNs
10711                                  * smaller or equal to the cumulative TSN.
10712                                  */
10713                                 tsn_map &= (~0U << (1 - offset));
10714                         }
10715                         selector = &sack_array[tsn_map];
10716                         if (mergeable && selector->right_edge) {
10717                                 /*
10718                                  * Backup, left and right edges were ok to
10719                                  * merge.
10720                                  */
10721                                 num_gap_blocks--;
10722                                 gap_descriptor--;
10723                         }
10724                         if (selector->num_entries == 0)
10725                                 mergeable = 0;
10726                         else {
10727                                 for (j = 0; j < selector->num_entries; j++) {
10728                                         if (mergeable && selector->right_edge) {
10729                                                 /*
10730                                                  * do a merge by NOT setting
10731                                                  * the left side
10732                                                  */
10733                                                 mergeable = 0;
10734                                         } else {
10735                                                 /*
10736                                                  * no merge, set the left
10737                                                  * side
10738                                                  */
10739                                                 mergeable = 0;
10740                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10741                                         }
10742                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10743                                         num_gap_blocks++;
10744                                         gap_descriptor++;
10745                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10746                                                 /* no more room */
10747                                                 limit_reached = 1;
10748                                                 break;
10749                                         }
10750                                 }
10751                                 if (selector->left_edge) {
10752                                         mergeable = 1;
10753                                 }
10754                         }
10755                         if (limit_reached) {
10756                                 /* Reached the limit stop */
10757                                 break;
10758                         }
10759                         offset += 8;
10760                 }
10761         }
10762         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10763             (limit_reached == 0)) {
10764
10765                 mergeable = 0;
10766
10767                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10768                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10769                 } else {
10770                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10771                 }
10772
10773                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10774                         offset = 1;
10775                 } else {
10776                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10777                 }
10778                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10779                         /* we have a gap .. maybe */
10780                         for (i = 0; i < siz; i++) {
10781                                 tsn_map = asoc->nr_mapping_array[i];
10782                                 if (i == 0) {
10783                                         /*
10784                                          * Clear all bits corresponding to
10785                                          * TSNs smaller or equal to the
10786                                          * cumulative TSN.
10787                                          */
10788                                         tsn_map &= (~0U << (1 - offset));
10789                                 }
10790                                 selector = &sack_array[tsn_map];
10791                                 if (mergeable && selector->right_edge) {
10792                                         /*
10793                                          * Backup, left and right edges were
10794                                          * ok to merge.
10795                                          */
10796                                         num_nr_gap_blocks--;
10797                                         gap_descriptor--;
10798                                 }
10799                                 if (selector->num_entries == 0)
10800                                         mergeable = 0;
10801                                 else {
10802                                         for (j = 0; j < selector->num_entries; j++) {
10803                                                 if (mergeable && selector->right_edge) {
10804                                                         /*
10805                                                          * do a merge by NOT
10806                                                          * setting the left
10807                                                          * side
10808                                                          */
10809                                                         mergeable = 0;
10810                                                 } else {
10811                                                         /*
10812                                                          * no merge, set the
10813                                                          * left side
10814                                                          */
10815                                                         mergeable = 0;
10816                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10817                                                 }
10818                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10819                                                 num_nr_gap_blocks++;
10820                                                 gap_descriptor++;
10821                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10822                                                         /* no more room */
10823                                                         limit_reached = 1;
10824                                                         break;
10825                                                 }
10826                                         }
10827                                         if (selector->left_edge) {
10828                                                 mergeable = 1;
10829                                         }
10830                                 }
10831                                 if (limit_reached) {
10832                                         /* Reached the limit stop */
10833                                         break;
10834                                 }
10835                                 offset += 8;
10836                         }
10837                 }
10838         }
10839         /* now we must add any dups we are going to report. */
10840         if ((limit_reached == 0) && (asoc->numduptsns)) {
10841                 dup = (uint32_t *)gap_descriptor;
10842                 for (i = 0; i < asoc->numduptsns; i++) {
10843                         *dup = htonl(asoc->dup_tsns[i]);
10844                         dup++;
10845                         num_dups++;
10846                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10847                                 /* no more room */
10848                                 break;
10849                         }
10850                 }
10851                 asoc->numduptsns = 0;
10852         }
10853         /*
10854          * now that the chunk is prepared queue it to the control chunk
10855          * queue.
10856          */
10857         if (type == SCTP_SELECTIVE_ACK) {
10858                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10859                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10860                     num_dups * sizeof(int32_t));
10861                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10862                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10863                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10864                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10865                 sack->sack.num_dup_tsns = htons(num_dups);
10866                 sack->ch.chunk_type = type;
10867                 sack->ch.chunk_flags = flags;
10868                 sack->ch.chunk_length = htons(a_chk->send_size);
10869         } else {
10870                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10871                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10872                     num_dups * sizeof(int32_t));
10873                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10874                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10875                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10876                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10877                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10878                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10879                 nr_sack->nr_sack.reserved = 0;
10880                 nr_sack->ch.chunk_type = type;
10881                 nr_sack->ch.chunk_flags = flags;
10882                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10883         }
10884         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10885         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10886         asoc->ctrl_queue_cnt++;
10887         asoc->send_sack = 0;
10888         SCTP_STAT_INCR(sctps_sendsacks);
10889         return;
10890 }
10891
10892 void
10893 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10894 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10895     SCTP_UNUSED
10896 #endif
10897 )
10898 {
10899         struct mbuf *m_abort, *m, *m_last;
10900         struct mbuf *m_out, *m_end = NULL;
10901         struct sctp_abort_chunk *abort;
10902         struct sctp_auth_chunk *auth = NULL;
10903         struct sctp_nets *net;
10904         uint32_t vtag;
10905         uint32_t auth_offset = 0;
10906         int error;
10907         uint16_t cause_len, chunk_len, padding_len;
10908
10909         SCTP_TCB_LOCK_ASSERT(stcb);
10910         /*-
10911          * Add an AUTH chunk, if chunk requires it and save the offset into
10912          * the chain for AUTH
10913          */
10914         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10915             stcb->asoc.peer_auth_chunks)) {
10916                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10917                     stcb, SCTP_ABORT_ASSOCIATION);
10918                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10919         } else {
10920                 m_out = NULL;
10921         }
10922         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10923         if (m_abort == NULL) {
10924                 if (m_out) {
10925                         sctp_m_freem(m_out);
10926                 }
10927                 if (operr) {
10928                         sctp_m_freem(operr);
10929                 }
10930                 return;
10931         }
10932         /* link in any error */
10933         SCTP_BUF_NEXT(m_abort) = operr;
10934         cause_len = 0;
10935         m_last = NULL;
10936         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10937                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10938                 if (SCTP_BUF_NEXT(m) == NULL) {
10939                         m_last = m;
10940                 }
10941         }
10942         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10943         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10944         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10945         if (m_out == NULL) {
10946                 /* NO Auth chunk prepended, so reserve space in front */
10947                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10948                 m_out = m_abort;
10949         } else {
10950                 /* Put AUTH chunk at the front of the chain */
10951                 SCTP_BUF_NEXT(m_end) = m_abort;
10952         }
10953         if (stcb->asoc.alternate) {
10954                 net = stcb->asoc.alternate;
10955         } else {
10956                 net = stcb->asoc.primary_destination;
10957         }
10958         /* Fill in the ABORT chunk header. */
10959         abort = mtod(m_abort, struct sctp_abort_chunk *);
10960         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10961         if (stcb->asoc.peer_vtag == 0) {
10962                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10963                 vtag = stcb->asoc.my_vtag;
10964                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10965         } else {
10966                 vtag = stcb->asoc.peer_vtag;
10967                 abort->ch.chunk_flags = 0;
10968         }
10969         abort->ch.chunk_length = htons(chunk_len);
10970         /* Add padding, if necessary. */
10971         if (padding_len > 0) {
10972                 if ((m_last == NULL) ||
10973                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10974                         sctp_m_freem(m_out);
10975                         return;
10976                 }
10977         }
10978         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10979             (struct sockaddr *)&net->ro._l_addr,
10980             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10981             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10982             stcb->asoc.primary_destination->port, NULL,
10983             0, 0,
10984             so_locked))) {
10985                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10986                 if (error == ENOBUFS) {
10987                         stcb->asoc.ifp_had_enobuf = 1;
10988                         SCTP_STAT_INCR(sctps_lowlevelerr);
10989                 }
10990         } else {
10991                 stcb->asoc.ifp_had_enobuf = 0;
10992         }
10993         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10994 }
10995
10996 void
10997 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10998     struct sctp_nets *net,
10999     int reflect_vtag)
11000 {
11001         /* formulate and SEND a SHUTDOWN-COMPLETE */
11002         struct mbuf *m_shutdown_comp;
11003         struct sctp_shutdown_complete_chunk *shutdown_complete;
11004         uint32_t vtag;
11005         int error;
11006         uint8_t flags;
11007
11008         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11009         if (m_shutdown_comp == NULL) {
11010                 /* no mbuf's */
11011                 return;
11012         }
11013         if (reflect_vtag) {
11014                 flags = SCTP_HAD_NO_TCB;
11015                 vtag = stcb->asoc.my_vtag;
11016         } else {
11017                 flags = 0;
11018                 vtag = stcb->asoc.peer_vtag;
11019         }
11020         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11021         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11022         shutdown_complete->ch.chunk_flags = flags;
11023         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11024         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11025         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11026             (struct sockaddr *)&net->ro._l_addr,
11027             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11028             stcb->sctp_ep->sctp_lport, stcb->rport,
11029             htonl(vtag),
11030             net->port, NULL,
11031             0, 0,
11032             SCTP_SO_NOT_LOCKED))) {
11033                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11034                 if (error == ENOBUFS) {
11035                         stcb->asoc.ifp_had_enobuf = 1;
11036                         SCTP_STAT_INCR(sctps_lowlevelerr);
11037                 }
11038         } else {
11039                 stcb->asoc.ifp_had_enobuf = 0;
11040         }
11041         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11042         return;
11043 }
11044
11045 static void
11046 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11047     struct sctphdr *sh, uint32_t vtag,
11048     uint8_t type, struct mbuf *cause,
11049     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11050     uint32_t vrf_id, uint16_t port)
11051 {
11052         struct mbuf *o_pak;
11053         struct mbuf *mout;
11054         struct sctphdr *shout;
11055         struct sctp_chunkhdr *ch;
11056 #if defined(INET) || defined(INET6)
11057         struct udphdr *udp;
11058         int ret;
11059 #endif
11060         int len, cause_len, padding_len;
11061 #ifdef INET
11062         struct sockaddr_in *src_sin, *dst_sin;
11063         struct ip *ip;
11064 #endif
11065 #ifdef INET6
11066         struct sockaddr_in6 *src_sin6, *dst_sin6;
11067         struct ip6_hdr *ip6;
11068 #endif
11069
11070         /* Compute the length of the cause and add final padding. */
11071         cause_len = 0;
11072         if (cause != NULL) {
11073                 struct mbuf *m_at, *m_last = NULL;
11074
11075                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11076                         if (SCTP_BUF_NEXT(m_at) == NULL)
11077                                 m_last = m_at;
11078                         cause_len += SCTP_BUF_LEN(m_at);
11079                 }
11080                 padding_len = cause_len % 4;
11081                 if (padding_len != 0) {
11082                         padding_len = 4 - padding_len;
11083                 }
11084                 if (padding_len != 0) {
11085                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11086                                 sctp_m_freem(cause);
11087                                 return;
11088                         }
11089                 }
11090         } else {
11091                 padding_len = 0;
11092         }
11093         /* Get an mbuf for the header. */
11094         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11095         switch (dst->sa_family) {
11096 #ifdef INET
11097         case AF_INET:
11098                 len += sizeof(struct ip);
11099                 break;
11100 #endif
11101 #ifdef INET6
11102         case AF_INET6:
11103                 len += sizeof(struct ip6_hdr);
11104                 break;
11105 #endif
11106         default:
11107                 break;
11108         }
11109 #if defined(INET) || defined(INET6)
11110         if (port) {
11111                 len += sizeof(struct udphdr);
11112         }
11113 #endif
11114         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11115         if (mout == NULL) {
11116                 if (cause) {
11117                         sctp_m_freem(cause);
11118                 }
11119                 return;
11120         }
11121         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11122         SCTP_BUF_LEN(mout) = len;
11123         SCTP_BUF_NEXT(mout) = cause;
11124         M_SETFIB(mout, fibnum);
11125         mout->m_pkthdr.flowid = mflowid;
11126         M_HASHTYPE_SET(mout, mflowtype);
11127 #ifdef INET
11128         ip = NULL;
11129 #endif
11130 #ifdef INET6
11131         ip6 = NULL;
11132 #endif
11133         switch (dst->sa_family) {
11134 #ifdef INET
11135         case AF_INET:
11136                 src_sin = (struct sockaddr_in *)src;
11137                 dst_sin = (struct sockaddr_in *)dst;
11138                 ip = mtod(mout, struct ip *);
11139                 ip->ip_v = IPVERSION;
11140                 ip->ip_hl = (sizeof(struct ip) >> 2);
11141                 ip->ip_tos = 0;
11142                 ip->ip_off = htons(IP_DF);
11143                 ip_fillid(ip);
11144                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11145                 if (port) {
11146                         ip->ip_p = IPPROTO_UDP;
11147                 } else {
11148                         ip->ip_p = IPPROTO_SCTP;
11149                 }
11150                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11151                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11152                 ip->ip_sum = 0;
11153                 len = sizeof(struct ip);
11154                 shout = (struct sctphdr *)((caddr_t)ip + len);
11155                 break;
11156 #endif
11157 #ifdef INET6
11158         case AF_INET6:
11159                 src_sin6 = (struct sockaddr_in6 *)src;
11160                 dst_sin6 = (struct sockaddr_in6 *)dst;
11161                 ip6 = mtod(mout, struct ip6_hdr *);
11162                 ip6->ip6_flow = htonl(0x60000000);
11163                 if (V_ip6_auto_flowlabel) {
11164                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11165                 }
11166                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11167                 if (port) {
11168                         ip6->ip6_nxt = IPPROTO_UDP;
11169                 } else {
11170                         ip6->ip6_nxt = IPPROTO_SCTP;
11171                 }
11172                 ip6->ip6_src = dst_sin6->sin6_addr;
11173                 ip6->ip6_dst = src_sin6->sin6_addr;
11174                 len = sizeof(struct ip6_hdr);
11175                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11176                 break;
11177 #endif
11178         default:
11179                 len = 0;
11180                 shout = mtod(mout, struct sctphdr *);
11181                 break;
11182         }
11183 #if defined(INET) || defined(INET6)
11184         if (port) {
11185                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11186                         sctp_m_freem(mout);
11187                         return;
11188                 }
11189                 udp = (struct udphdr *)shout;
11190                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11191                 udp->uh_dport = port;
11192                 udp->uh_sum = 0;
11193                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11194                     sizeof(struct sctphdr) +
11195                     sizeof(struct sctp_chunkhdr) +
11196                     cause_len + padding_len));
11197                 len += sizeof(struct udphdr);
11198                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11199         } else {
11200                 udp = NULL;
11201         }
11202 #endif
11203         shout->src_port = sh->dest_port;
11204         shout->dest_port = sh->src_port;
11205         shout->checksum = 0;
11206         if (vtag) {
11207                 shout->v_tag = htonl(vtag);
11208         } else {
11209                 shout->v_tag = sh->v_tag;
11210         }
11211         len += sizeof(struct sctphdr);
11212         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11213         ch->chunk_type = type;
11214         if (vtag) {
11215                 ch->chunk_flags = 0;
11216         } else {
11217                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11218         }
11219         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11220         len += sizeof(struct sctp_chunkhdr);
11221         len += cause_len + padding_len;
11222
11223         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11224                 sctp_m_freem(mout);
11225                 return;
11226         }
11227         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11228         switch (dst->sa_family) {
11229 #ifdef INET
11230         case AF_INET:
11231                 if (port) {
11232                         if (V_udp_cksum) {
11233                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11234                         } else {
11235                                 udp->uh_sum = 0;
11236                         }
11237                 }
11238                 ip->ip_len = htons(len);
11239                 if (port) {
11240                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11241                         SCTP_STAT_INCR(sctps_sendswcrc);
11242                         if (V_udp_cksum) {
11243                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11244                         }
11245                 } else {
11246                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11247                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11248                         SCTP_STAT_INCR(sctps_sendhwcrc);
11249                 }
11250 #ifdef SCTP_PACKET_LOGGING
11251                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11252                         sctp_packet_log(o_pak);
11253                 }
11254 #endif
11255                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11256                 break;
11257 #endif
11258 #ifdef INET6
11259         case AF_INET6:
11260                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11261                 if (port) {
11262                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11263                         SCTP_STAT_INCR(sctps_sendswcrc);
11264                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11265                                 udp->uh_sum = 0xffff;
11266                         }
11267                 } else {
11268                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11269                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11270                         SCTP_STAT_INCR(sctps_sendhwcrc);
11271                 }
11272 #ifdef SCTP_PACKET_LOGGING
11273                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11274                         sctp_packet_log(o_pak);
11275                 }
11276 #endif
11277                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11278                 break;
11279 #endif
11280         default:
11281                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11282                     dst->sa_family);
11283                 sctp_m_freem(mout);
11284                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11285                 return;
11286         }
11287         SCTP_STAT_INCR(sctps_sendpackets);
11288         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11289         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11290         return;
11291 }
11292
11293 void
11294 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11295     struct sctphdr *sh,
11296     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11297     uint32_t vrf_id, uint16_t port)
11298 {
11299         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11300             mflowtype, mflowid, fibnum,
11301             vrf_id, port);
11302 }
11303
11304 void
11305 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11306 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11307     SCTP_UNUSED
11308 #endif
11309 )
11310 {
11311         struct sctp_tmit_chunk *chk;
11312         struct sctp_heartbeat_chunk *hb;
11313         struct timeval now;
11314
11315         SCTP_TCB_LOCK_ASSERT(stcb);
11316         if (net == NULL) {
11317                 return;
11318         }
11319         (void)SCTP_GETTIME_TIMEVAL(&now);
11320         switch (net->ro._l_addr.sa.sa_family) {
11321 #ifdef INET
11322         case AF_INET:
11323                 break;
11324 #endif
11325 #ifdef INET6
11326         case AF_INET6:
11327                 break;
11328 #endif
11329         default:
11330                 return;
11331         }
11332         sctp_alloc_a_chunk(stcb, chk);
11333         if (chk == NULL) {
11334                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11335                 return;
11336         }
11337
11338         chk->copy_by_ref = 0;
11339         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11340         chk->rec.chunk_id.can_take_data = 1;
11341         chk->flags = 0;
11342         chk->asoc = &stcb->asoc;
11343         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11344
11345         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11346         if (chk->data == NULL) {
11347                 sctp_free_a_chunk(stcb, chk, so_locked);
11348                 return;
11349         }
11350         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11351         SCTP_BUF_LEN(chk->data) = chk->send_size;
11352         chk->sent = SCTP_DATAGRAM_UNSENT;
11353         chk->snd_count = 0;
11354         chk->whoTo = net;
11355         atomic_add_int(&chk->whoTo->ref_count, 1);
11356         /* Now we have a mbuf that we can fill in with the details */
11357         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11358         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11359         /* fill out chunk header */
11360         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11361         hb->ch.chunk_flags = 0;
11362         hb->ch.chunk_length = htons(chk->send_size);
11363         /* Fill out hb parameter */
11364         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11365         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11366         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11367         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11368         /* Did our user request this one, put it in */
11369         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11370         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11371         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11372                 /*
11373                  * we only take from the entropy pool if the address is not
11374                  * confirmed.
11375                  */
11376                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11377                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11378         } else {
11379                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11380                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11381         }
11382         switch (net->ro._l_addr.sa.sa_family) {
11383 #ifdef INET
11384         case AF_INET:
11385                 memcpy(hb->heartbeat.hb_info.address,
11386                     &net->ro._l_addr.sin.sin_addr,
11387                     sizeof(net->ro._l_addr.sin.sin_addr));
11388                 break;
11389 #endif
11390 #ifdef INET6
11391         case AF_INET6:
11392                 memcpy(hb->heartbeat.hb_info.address,
11393                     &net->ro._l_addr.sin6.sin6_addr,
11394                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11395                 break;
11396 #endif
11397         default:
11398                 if (chk->data) {
11399                         sctp_m_freem(chk->data);
11400                         chk->data = NULL;
11401                 }
11402                 sctp_free_a_chunk(stcb, chk, so_locked);
11403                 return;
11404                 break;
11405         }
11406         net->hb_responded = 0;
11407         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11408         stcb->asoc.ctrl_queue_cnt++;
11409         SCTP_STAT_INCR(sctps_sendheartbeat);
11410         return;
11411 }
11412
11413 void
11414 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11415     uint32_t high_tsn)
11416 {
11417         struct sctp_association *asoc;
11418         struct sctp_ecne_chunk *ecne;
11419         struct sctp_tmit_chunk *chk;
11420
11421         if (net == NULL) {
11422                 return;
11423         }
11424         asoc = &stcb->asoc;
11425         SCTP_TCB_LOCK_ASSERT(stcb);
11426         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11427                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11428                         /* found a previous ECN_ECHO update it if needed */
11429                         uint32_t cnt, ctsn;
11430
11431                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11432                         ctsn = ntohl(ecne->tsn);
11433                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11434                                 ecne->tsn = htonl(high_tsn);
11435                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11436                         }
11437                         cnt = ntohl(ecne->num_pkts_since_cwr);
11438                         cnt++;
11439                         ecne->num_pkts_since_cwr = htonl(cnt);
11440                         return;
11441                 }
11442         }
11443         /* nope could not find one to update so we must build one */
11444         sctp_alloc_a_chunk(stcb, chk);
11445         if (chk == NULL) {
11446                 return;
11447         }
11448         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11449         chk->copy_by_ref = 0;
11450         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11451         chk->rec.chunk_id.can_take_data = 0;
11452         chk->flags = 0;
11453         chk->asoc = &stcb->asoc;
11454         chk->send_size = sizeof(struct sctp_ecne_chunk);
11455         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11456         if (chk->data == NULL) {
11457                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11458                 return;
11459         }
11460         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11461         SCTP_BUF_LEN(chk->data) = chk->send_size;
11462         chk->sent = SCTP_DATAGRAM_UNSENT;
11463         chk->snd_count = 0;
11464         chk->whoTo = net;
11465         atomic_add_int(&chk->whoTo->ref_count, 1);
11466
11467         stcb->asoc.ecn_echo_cnt_onq++;
11468         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11469         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11470         ecne->ch.chunk_flags = 0;
11471         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11472         ecne->tsn = htonl(high_tsn);
11473         ecne->num_pkts_since_cwr = htonl(1);
11474         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11475         asoc->ctrl_queue_cnt++;
11476 }
11477
11478 void
11479 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11480     struct mbuf *m, int len, int iphlen, int bad_crc)
11481 {
11482         struct sctp_association *asoc;
11483         struct sctp_pktdrop_chunk *drp;
11484         struct sctp_tmit_chunk *chk;
11485         uint8_t *datap;
11486         int was_trunc = 0;
11487         int fullsz = 0;
11488         long spc;
11489         int offset;
11490         struct sctp_chunkhdr *ch, chunk_buf;
11491         unsigned int chk_length;
11492
11493         if (!stcb) {
11494                 return;
11495         }
11496         asoc = &stcb->asoc;
11497         SCTP_TCB_LOCK_ASSERT(stcb);
11498         if (asoc->pktdrop_supported == 0) {
11499                 /*-
11500                  * peer must declare support before I send one.
11501                  */
11502                 return;
11503         }
11504         if (stcb->sctp_socket == NULL) {
11505                 return;
11506         }
11507         sctp_alloc_a_chunk(stcb, chk);
11508         if (chk == NULL) {
11509                 return;
11510         }
11511         chk->copy_by_ref = 0;
11512         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11513         chk->rec.chunk_id.can_take_data = 1;
11514         chk->flags = 0;
11515         len -= iphlen;
11516         chk->send_size = len;
11517         /* Validate that we do not have an ABORT in here. */
11518         offset = iphlen + sizeof(struct sctphdr);
11519         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11520             sizeof(*ch), (uint8_t *)&chunk_buf);
11521         while (ch != NULL) {
11522                 chk_length = ntohs(ch->chunk_length);
11523                 if (chk_length < sizeof(*ch)) {
11524                         /* break to abort land */
11525                         break;
11526                 }
11527                 switch (ch->chunk_type) {
11528                 case SCTP_PACKET_DROPPED:
11529                 case SCTP_ABORT_ASSOCIATION:
11530                 case SCTP_INITIATION_ACK:
11531                         /**
11532                          * We don't respond with an PKT-DROP to an ABORT
11533                          * or PKT-DROP. We also do not respond to an
11534                          * INIT-ACK, because we can't know if the initiation
11535                          * tag is correct or not.
11536                          */
11537                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11538                         return;
11539                 default:
11540                         break;
11541                 }
11542                 offset += SCTP_SIZE32(chk_length);
11543                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11544                     sizeof(*ch), (uint8_t *)&chunk_buf);
11545         }
11546
11547         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11548             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11549                 /*
11550                  * only send 1 mtu worth, trim off the excess on the end.
11551                  */
11552                 fullsz = len;
11553                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11554                 was_trunc = 1;
11555         }
11556         chk->asoc = &stcb->asoc;
11557         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11558         if (chk->data == NULL) {
11559 jump_out:
11560                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11561                 return;
11562         }
11563         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11564         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11565         if (drp == NULL) {
11566                 sctp_m_freem(chk->data);
11567                 chk->data = NULL;
11568                 goto jump_out;
11569         }
11570         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11571             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11572         chk->book_size_scale = 0;
11573         if (was_trunc) {
11574                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11575                 drp->trunc_len = htons(fullsz);
11576                 /*
11577                  * Len is already adjusted to size minus overhead above take
11578                  * out the pkt_drop chunk itself from it.
11579                  */
11580                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11581                 len = chk->send_size;
11582         } else {
11583                 /* no truncation needed */
11584                 drp->ch.chunk_flags = 0;
11585                 drp->trunc_len = htons(0);
11586         }
11587         if (bad_crc) {
11588                 drp->ch.chunk_flags |= SCTP_BADCRC;
11589         }
11590         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11591         SCTP_BUF_LEN(chk->data) = chk->send_size;
11592         chk->sent = SCTP_DATAGRAM_UNSENT;
11593         chk->snd_count = 0;
11594         if (net) {
11595                 /* we should hit here */
11596                 chk->whoTo = net;
11597                 atomic_add_int(&chk->whoTo->ref_count, 1);
11598         } else {
11599                 chk->whoTo = NULL;
11600         }
11601         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11602         drp->ch.chunk_length = htons(chk->send_size);
11603         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11604         if (spc < 0) {
11605                 spc = 0;
11606         }
11607         drp->bottle_bw = htonl(spc);
11608         if (asoc->my_rwnd) {
11609                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11610                     asoc->size_on_all_streams +
11611                     asoc->my_rwnd_control_len +
11612                     stcb->sctp_socket->so_rcv.sb_cc);
11613         } else {
11614                 /*-
11615                  * If my rwnd is 0, possibly from mbuf depletion as well as
11616                  * space used, tell the peer there is NO space aka onq == bw
11617                  */
11618                 drp->current_onq = htonl(spc);
11619         }
11620         drp->reserved = 0;
11621         datap = drp->data;
11622         m_copydata(m, iphlen, len, (caddr_t)datap);
11623         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11624         asoc->ctrl_queue_cnt++;
11625 }
11626
11627 void
11628 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11629 {
11630         struct sctp_association *asoc;
11631         struct sctp_cwr_chunk *cwr;
11632         struct sctp_tmit_chunk *chk;
11633
11634         SCTP_TCB_LOCK_ASSERT(stcb);
11635         if (net == NULL) {
11636                 return;
11637         }
11638         asoc = &stcb->asoc;
11639         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11640                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11641                         /*
11642                          * found a previous CWR queued to same destination
11643                          * update it if needed
11644                          */
11645                         uint32_t ctsn;
11646
11647                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11648                         ctsn = ntohl(cwr->tsn);
11649                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11650                                 cwr->tsn = htonl(high_tsn);
11651                         }
11652                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11653                                 /* Make sure override is carried */
11654                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11655                         }
11656                         return;
11657                 }
11658         }
11659         sctp_alloc_a_chunk(stcb, chk);
11660         if (chk == NULL) {
11661                 return;
11662         }
11663         chk->copy_by_ref = 0;
11664         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11665         chk->rec.chunk_id.can_take_data = 1;
11666         chk->flags = 0;
11667         chk->asoc = &stcb->asoc;
11668         chk->send_size = sizeof(struct sctp_cwr_chunk);
11669         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11670         if (chk->data == NULL) {
11671                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11672                 return;
11673         }
11674         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11675         SCTP_BUF_LEN(chk->data) = chk->send_size;
11676         chk->sent = SCTP_DATAGRAM_UNSENT;
11677         chk->snd_count = 0;
11678         chk->whoTo = net;
11679         atomic_add_int(&chk->whoTo->ref_count, 1);
11680         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11681         cwr->ch.chunk_type = SCTP_ECN_CWR;
11682         cwr->ch.chunk_flags = override;
11683         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11684         cwr->tsn = htonl(high_tsn);
11685         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11686         asoc->ctrl_queue_cnt++;
11687 }
11688
11689 static int
11690 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11691     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11692 {
11693         uint16_t len, old_len, i;
11694         struct sctp_stream_reset_out_request *req_out;
11695         struct sctp_chunkhdr *ch;
11696         int at;
11697         int number_entries = 0;
11698
11699         ch = mtod(chk->data, struct sctp_chunkhdr *);
11700         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11701         /* get to new offset for the param. */
11702         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11703         /* now how long will this param be? */
11704         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11705                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11706                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11707                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11708                         number_entries++;
11709                 }
11710         }
11711         if (number_entries == 0) {
11712                 return (0);
11713         }
11714         if (number_entries == stcb->asoc.streamoutcnt) {
11715                 number_entries = 0;
11716         }
11717         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11718                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11719         }
11720         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11721         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11722         req_out->ph.param_length = htons(len);
11723         req_out->request_seq = htonl(seq);
11724         req_out->response_seq = htonl(resp_seq);
11725         req_out->send_reset_at_tsn = htonl(last_sent);
11726         at = 0;
11727         if (number_entries) {
11728                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11729                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11730                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11731                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11732                                 req_out->list_of_streams[at] = htons(i);
11733                                 at++;
11734                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11735                                 if (at >= number_entries) {
11736                                         break;
11737                                 }
11738                         }
11739                 }
11740         } else {
11741                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11742                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11743                 }
11744         }
11745         if (SCTP_SIZE32(len) > len) {
11746                 /*-
11747                  * Need to worry about the pad we may end up adding to the
11748                  * end. This is easy since the struct is either aligned to 4
11749                  * bytes or 2 bytes off.
11750                  */
11751                 req_out->list_of_streams[number_entries] = 0;
11752         }
11753         /* now fix the chunk length */
11754         ch->chunk_length = htons(len + old_len);
11755         chk->book_size = len + old_len;
11756         chk->book_size_scale = 0;
11757         chk->send_size = SCTP_SIZE32(chk->book_size);
11758         SCTP_BUF_LEN(chk->data) = chk->send_size;
11759         return (1);
11760 }
11761
11762 static void
11763 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11764     int number_entries, uint16_t *list,
11765     uint32_t seq)
11766 {
11767         uint16_t len, old_len, i;
11768         struct sctp_stream_reset_in_request *req_in;
11769         struct sctp_chunkhdr *ch;
11770
11771         ch = mtod(chk->data, struct sctp_chunkhdr *);
11772         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11773
11774         /* get to new offset for the param. */
11775         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11776         /* now how long will this param be? */
11777         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11778         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11779         req_in->ph.param_length = htons(len);
11780         req_in->request_seq = htonl(seq);
11781         if (number_entries) {
11782                 for (i = 0; i < number_entries; i++) {
11783                         req_in->list_of_streams[i] = htons(list[i]);
11784                 }
11785         }
11786         if (SCTP_SIZE32(len) > len) {
11787                 /*-
11788                  * Need to worry about the pad we may end up adding to the
11789                  * end. This is easy since the struct is either aligned to 4
11790                  * bytes or 2 bytes off.
11791                  */
11792                 req_in->list_of_streams[number_entries] = 0;
11793         }
11794         /* now fix the chunk length */
11795         ch->chunk_length = htons(len + old_len);
11796         chk->book_size = len + old_len;
11797         chk->book_size_scale = 0;
11798         chk->send_size = SCTP_SIZE32(chk->book_size);
11799         SCTP_BUF_LEN(chk->data) = chk->send_size;
11800         return;
11801 }
11802
11803 static void
11804 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11805     uint32_t seq)
11806 {
11807         uint16_t len, old_len;
11808         struct sctp_stream_reset_tsn_request *req_tsn;
11809         struct sctp_chunkhdr *ch;
11810
11811         ch = mtod(chk->data, struct sctp_chunkhdr *);
11812         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11813
11814         /* get to new offset for the param. */
11815         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11816         /* now how long will this param be? */
11817         len = sizeof(struct sctp_stream_reset_tsn_request);
11818         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11819         req_tsn->ph.param_length = htons(len);
11820         req_tsn->request_seq = htonl(seq);
11821
11822         /* now fix the chunk length */
11823         ch->chunk_length = htons(len + old_len);
11824         chk->send_size = len + old_len;
11825         chk->book_size = SCTP_SIZE32(chk->send_size);
11826         chk->book_size_scale = 0;
11827         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11828         return;
11829 }
11830
11831 void
11832 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11833     uint32_t resp_seq, uint32_t result)
11834 {
11835         uint16_t len, old_len;
11836         struct sctp_stream_reset_response *resp;
11837         struct sctp_chunkhdr *ch;
11838
11839         ch = mtod(chk->data, struct sctp_chunkhdr *);
11840         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11841
11842         /* get to new offset for the param. */
11843         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11844         /* now how long will this param be? */
11845         len = sizeof(struct sctp_stream_reset_response);
11846         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11847         resp->ph.param_length = htons(len);
11848         resp->response_seq = htonl(resp_seq);
11849         resp->result = ntohl(result);
11850
11851         /* now fix the chunk length */
11852         ch->chunk_length = htons(len + old_len);
11853         chk->book_size = len + old_len;
11854         chk->book_size_scale = 0;
11855         chk->send_size = SCTP_SIZE32(chk->book_size);
11856         SCTP_BUF_LEN(chk->data) = chk->send_size;
11857         return;
11858 }
11859
11860 void
11861 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11862     struct sctp_stream_reset_list *ent,
11863     int response)
11864 {
11865         struct sctp_association *asoc;
11866         struct sctp_tmit_chunk *chk;
11867         struct sctp_chunkhdr *ch;
11868
11869         asoc = &stcb->asoc;
11870
11871         /*
11872          * Reset our last reset action to the new one IP -> response
11873          * (PERFORMED probably). This assures that if we fail to send, a
11874          * retran from the peer will get the new response.
11875          */
11876         asoc->last_reset_action[0] = response;
11877         if (asoc->stream_reset_outstanding) {
11878                 return;
11879         }
11880         sctp_alloc_a_chunk(stcb, chk);
11881         if (chk == NULL) {
11882                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11883                 return;
11884         }
11885         chk->copy_by_ref = 0;
11886         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11887         chk->rec.chunk_id.can_take_data = 0;
11888         chk->flags = 0;
11889         chk->asoc = &stcb->asoc;
11890         chk->book_size = sizeof(struct sctp_chunkhdr);
11891         chk->send_size = SCTP_SIZE32(chk->book_size);
11892         chk->book_size_scale = 0;
11893         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11894         if (chk->data == NULL) {
11895                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11896                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11897                 return;
11898         }
11899         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11900         /* setup chunk parameters */
11901         chk->sent = SCTP_DATAGRAM_UNSENT;
11902         chk->snd_count = 0;
11903         if (stcb->asoc.alternate) {
11904                 chk->whoTo = stcb->asoc.alternate;
11905         } else {
11906                 chk->whoTo = stcb->asoc.primary_destination;
11907         }
11908         ch = mtod(chk->data, struct sctp_chunkhdr *);
11909         ch->chunk_type = SCTP_STREAM_RESET;
11910         ch->chunk_flags = 0;
11911         ch->chunk_length = htons(chk->book_size);
11912         atomic_add_int(&chk->whoTo->ref_count, 1);
11913         SCTP_BUF_LEN(chk->data) = chk->send_size;
11914         sctp_add_stream_reset_result(chk, ent->seq, response);
11915         /* insert the chunk for sending */
11916         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11917             chk,
11918             sctp_next);
11919         asoc->ctrl_queue_cnt++;
11920 }
11921
11922 void
11923 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11924     uint32_t resp_seq, uint32_t result,
11925     uint32_t send_una, uint32_t recv_next)
11926 {
11927         uint16_t len, old_len;
11928         struct sctp_stream_reset_response_tsn *resp;
11929         struct sctp_chunkhdr *ch;
11930
11931         ch = mtod(chk->data, struct sctp_chunkhdr *);
11932         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11933
11934         /* get to new offset for the param. */
11935         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11936         /* now how long will this param be? */
11937         len = sizeof(struct sctp_stream_reset_response_tsn);
11938         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11939         resp->ph.param_length = htons(len);
11940         resp->response_seq = htonl(resp_seq);
11941         resp->result = htonl(result);
11942         resp->senders_next_tsn = htonl(send_una);
11943         resp->receivers_next_tsn = htonl(recv_next);
11944
11945         /* now fix the chunk length */
11946         ch->chunk_length = htons(len + old_len);
11947         chk->book_size = len + old_len;
11948         chk->send_size = SCTP_SIZE32(chk->book_size);
11949         chk->book_size_scale = 0;
11950         SCTP_BUF_LEN(chk->data) = chk->send_size;
11951         return;
11952 }
11953
11954 static void
11955 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11956     uint32_t seq,
11957     uint16_t adding)
11958 {
11959         uint16_t len, old_len;
11960         struct sctp_chunkhdr *ch;
11961         struct sctp_stream_reset_add_strm *addstr;
11962
11963         ch = mtod(chk->data, struct sctp_chunkhdr *);
11964         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11965
11966         /* get to new offset for the param. */
11967         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11968         /* now how long will this param be? */
11969         len = sizeof(struct sctp_stream_reset_add_strm);
11970
11971         /* Fill it out. */
11972         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11973         addstr->ph.param_length = htons(len);
11974         addstr->request_seq = htonl(seq);
11975         addstr->number_of_streams = htons(adding);
11976         addstr->reserved = 0;
11977
11978         /* now fix the chunk length */
11979         ch->chunk_length = htons(len + old_len);
11980         chk->send_size = len + old_len;
11981         chk->book_size = SCTP_SIZE32(chk->send_size);
11982         chk->book_size_scale = 0;
11983         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11984         return;
11985 }
11986
11987 static void
11988 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11989     uint32_t seq,
11990     uint16_t adding)
11991 {
11992         uint16_t len, old_len;
11993         struct sctp_chunkhdr *ch;
11994         struct sctp_stream_reset_add_strm *addstr;
11995
11996         ch = mtod(chk->data, struct sctp_chunkhdr *);
11997         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11998
11999         /* get to new offset for the param. */
12000         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12001         /* now how long will this param be? */
12002         len = sizeof(struct sctp_stream_reset_add_strm);
12003         /* Fill it out. */
12004         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12005         addstr->ph.param_length = htons(len);
12006         addstr->request_seq = htonl(seq);
12007         addstr->number_of_streams = htons(adding);
12008         addstr->reserved = 0;
12009
12010         /* now fix the chunk length */
12011         ch->chunk_length = htons(len + old_len);
12012         chk->send_size = len + old_len;
12013         chk->book_size = SCTP_SIZE32(chk->send_size);
12014         chk->book_size_scale = 0;
12015         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12016         return;
12017 }
12018
12019 int
12020 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12021 {
12022         struct sctp_association *asoc;
12023         struct sctp_tmit_chunk *chk;
12024         struct sctp_chunkhdr *ch;
12025         uint32_t seq;
12026
12027         asoc = &stcb->asoc;
12028         asoc->trigger_reset = 0;
12029         if (asoc->stream_reset_outstanding) {
12030                 return (EALREADY);
12031         }
12032         sctp_alloc_a_chunk(stcb, chk);
12033         if (chk == NULL) {
12034                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12035                 return (ENOMEM);
12036         }
12037         chk->copy_by_ref = 0;
12038         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12039         chk->rec.chunk_id.can_take_data = 0;
12040         chk->flags = 0;
12041         chk->asoc = &stcb->asoc;
12042         chk->book_size = sizeof(struct sctp_chunkhdr);
12043         chk->send_size = SCTP_SIZE32(chk->book_size);
12044         chk->book_size_scale = 0;
12045         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12046         if (chk->data == NULL) {
12047                 sctp_free_a_chunk(stcb, chk, so_locked);
12048                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12049                 return (ENOMEM);
12050         }
12051         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12052
12053         /* setup chunk parameters */
12054         chk->sent = SCTP_DATAGRAM_UNSENT;
12055         chk->snd_count = 0;
12056         if (stcb->asoc.alternate) {
12057                 chk->whoTo = stcb->asoc.alternate;
12058         } else {
12059                 chk->whoTo = stcb->asoc.primary_destination;
12060         }
12061         ch = mtod(chk->data, struct sctp_chunkhdr *);
12062         ch->chunk_type = SCTP_STREAM_RESET;
12063         ch->chunk_flags = 0;
12064         ch->chunk_length = htons(chk->book_size);
12065         atomic_add_int(&chk->whoTo->ref_count, 1);
12066         SCTP_BUF_LEN(chk->data) = chk->send_size;
12067         seq = stcb->asoc.str_reset_seq_out;
12068         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12069                 seq++;
12070                 asoc->stream_reset_outstanding++;
12071         } else {
12072                 m_freem(chk->data);
12073                 chk->data = NULL;
12074                 sctp_free_a_chunk(stcb, chk, so_locked);
12075                 return (ENOENT);
12076         }
12077         asoc->str_reset = chk;
12078         /* insert the chunk for sending */
12079         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12080             chk,
12081             sctp_next);
12082         asoc->ctrl_queue_cnt++;
12083
12084         if (stcb->asoc.send_sack) {
12085                 sctp_send_sack(stcb, so_locked);
12086         }
12087         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12088         return (0);
12089 }
12090
12091 int
12092 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12093     uint16_t number_entries, uint16_t *list,
12094     uint8_t send_in_req,
12095     uint8_t send_tsn_req,
12096     uint8_t add_stream,
12097     uint16_t adding_o,
12098     uint16_t adding_i, uint8_t peer_asked)
12099 {
12100         struct sctp_association *asoc;
12101         struct sctp_tmit_chunk *chk;
12102         struct sctp_chunkhdr *ch;
12103         int can_send_out_req = 0;
12104         uint32_t seq;
12105
12106         asoc = &stcb->asoc;
12107         if (asoc->stream_reset_outstanding) {
12108                 /*-
12109                  * Already one pending, must get ACK back to clear the flag.
12110                  */
12111                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12112                 return (EBUSY);
12113         }
12114         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12115             (add_stream == 0)) {
12116                 /* nothing to do */
12117                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12118                 return (EINVAL);
12119         }
12120         if (send_tsn_req && send_in_req) {
12121                 /* error, can't do that */
12122                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12123                 return (EINVAL);
12124         } else if (send_in_req) {
12125                 can_send_out_req = 1;
12126         }
12127         if (number_entries > (MCLBYTES -
12128             SCTP_MIN_OVERHEAD -
12129             sizeof(struct sctp_chunkhdr) -
12130             sizeof(struct sctp_stream_reset_out_request)) /
12131             sizeof(uint16_t)) {
12132                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12133                 return (ENOMEM);
12134         }
12135         sctp_alloc_a_chunk(stcb, chk);
12136         if (chk == NULL) {
12137                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12138                 return (ENOMEM);
12139         }
12140         chk->copy_by_ref = 0;
12141         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12142         chk->rec.chunk_id.can_take_data = 0;
12143         chk->flags = 0;
12144         chk->asoc = &stcb->asoc;
12145         chk->book_size = sizeof(struct sctp_chunkhdr);
12146         chk->send_size = SCTP_SIZE32(chk->book_size);
12147         chk->book_size_scale = 0;
12148
12149         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12150         if (chk->data == NULL) {
12151                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12152                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12153                 return (ENOMEM);
12154         }
12155         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12156
12157         /* setup chunk parameters */
12158         chk->sent = SCTP_DATAGRAM_UNSENT;
12159         chk->snd_count = 0;
12160         if (stcb->asoc.alternate) {
12161                 chk->whoTo = stcb->asoc.alternate;
12162         } else {
12163                 chk->whoTo = stcb->asoc.primary_destination;
12164         }
12165         atomic_add_int(&chk->whoTo->ref_count, 1);
12166         ch = mtod(chk->data, struct sctp_chunkhdr *);
12167         ch->chunk_type = SCTP_STREAM_RESET;
12168         ch->chunk_flags = 0;
12169         ch->chunk_length = htons(chk->book_size);
12170         SCTP_BUF_LEN(chk->data) = chk->send_size;
12171
12172         seq = stcb->asoc.str_reset_seq_out;
12173         if (can_send_out_req) {
12174                 int ret;
12175
12176                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12177                 if (ret) {
12178                         seq++;
12179                         asoc->stream_reset_outstanding++;
12180                 }
12181         }
12182         if ((add_stream & 1) &&
12183             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12184                 /* Need to allocate more */
12185                 struct sctp_stream_out *oldstream;
12186                 struct sctp_stream_queue_pending *sp, *nsp;
12187                 int i;
12188 #if defined(SCTP_DETAILED_STR_STATS)
12189                 int j;
12190 #endif
12191
12192                 oldstream = stcb->asoc.strmout;
12193                 /* get some more */
12194                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12195                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12196                     SCTP_M_STRMO);
12197                 if (stcb->asoc.strmout == NULL) {
12198                         uint8_t x;
12199
12200                         stcb->asoc.strmout = oldstream;
12201                         /* Turn off the bit */
12202                         x = add_stream & 0xfe;
12203                         add_stream = x;
12204                         goto skip_stuff;
12205                 }
12206                 /*
12207                  * Ok now we proceed with copying the old out stuff and
12208                  * initializing the new stuff.
12209                  */
12210                 SCTP_TCB_SEND_LOCK(stcb);
12211                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12212                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12213                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12214                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12215                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12216                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12217                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12218                         stcb->asoc.strmout[i].sid = i;
12219                         stcb->asoc.strmout[i].state = oldstream[i].state;
12220                         /* FIX ME FIX ME */
12221                         /*
12222                          * This should be a SS_COPY operation FIX ME STREAM
12223                          * SCHEDULER EXPERT
12224                          */
12225                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12226                         /* now anything on those queues? */
12227                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12228                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12229                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12230                         }
12231
12232                 }
12233                 /* now the new streams */
12234                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12235                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12236                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12237                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12238 #if defined(SCTP_DETAILED_STR_STATS)
12239                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12240                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12241                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12242                         }
12243 #else
12244                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12245                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12246 #endif
12247                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12248                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12249                         stcb->asoc.strmout[i].sid = i;
12250                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12251                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12252                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12253                 }
12254                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12255                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12256                 SCTP_TCB_SEND_UNLOCK(stcb);
12257         }
12258 skip_stuff:
12259         if ((add_stream & 1) && (adding_o > 0)) {
12260                 asoc->strm_pending_add_size = adding_o;
12261                 asoc->peer_req_out = peer_asked;
12262                 sctp_add_an_out_stream(chk, seq, adding_o);
12263                 seq++;
12264                 asoc->stream_reset_outstanding++;
12265         }
12266         if ((add_stream & 2) && (adding_i > 0)) {
12267                 sctp_add_an_in_stream(chk, seq, adding_i);
12268                 seq++;
12269                 asoc->stream_reset_outstanding++;
12270         }
12271         if (send_in_req) {
12272                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12273                 seq++;
12274                 asoc->stream_reset_outstanding++;
12275         }
12276         if (send_tsn_req) {
12277                 sctp_add_stream_reset_tsn(chk, seq);
12278                 asoc->stream_reset_outstanding++;
12279         }
12280         asoc->str_reset = chk;
12281         /* insert the chunk for sending */
12282         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12283             chk,
12284             sctp_next);
12285         asoc->ctrl_queue_cnt++;
12286         if (stcb->asoc.send_sack) {
12287                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12288         }
12289         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12290         return (0);
12291 }
12292
12293 void
12294 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12295     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12296     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12297     uint32_t vrf_id, uint16_t port)
12298 {
12299         /* Don't respond to an ABORT with an ABORT. */
12300         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12301                 if (cause)
12302                         sctp_m_freem(cause);
12303                 return;
12304         }
12305         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12306             mflowtype, mflowid, fibnum,
12307             vrf_id, port);
12308         return;
12309 }
12310
12311 void
12312 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12313     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12314     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12315     uint32_t vrf_id, uint16_t port)
12316 {
12317         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12318             mflowtype, mflowid, fibnum,
12319             vrf_id, port);
12320         return;
12321 }
12322
12323 static struct mbuf *
12324 sctp_copy_resume(struct uio *uio,
12325     int max_send_len,
12326     int user_marks_eor,
12327     int *error,
12328     uint32_t *sndout,
12329     struct mbuf **new_tail)
12330 {
12331         struct mbuf *m;
12332
12333         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12334             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12335         if (m == NULL) {
12336                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12337                 *error = ENOBUFS;
12338         } else {
12339                 *sndout = m_length(m, NULL);
12340                 *new_tail = m_last(m);
12341         }
12342         return (m);
12343 }
12344
12345 static int
12346 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12347     struct uio *uio,
12348     int resv_upfront)
12349 {
12350         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12351             resv_upfront, 0);
12352         if (sp->data == NULL) {
12353                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12354                 return (ENOBUFS);
12355         }
12356
12357         sp->tail_mbuf = m_last(sp->data);
12358         return (0);
12359 }
12360
12361
12362
12363 static struct sctp_stream_queue_pending *
12364 sctp_copy_it_in(struct sctp_tcb *stcb,
12365     struct sctp_association *asoc,
12366     struct sctp_sndrcvinfo *srcv,
12367     struct uio *uio,
12368     struct sctp_nets *net,
12369     int max_send_len,
12370     int user_marks_eor,
12371     int *error)
12372 {
12373
12374         /*-
12375          * This routine must be very careful in its work. Protocol
12376          * processing is up and running so care must be taken to spl...()
12377          * when you need to do something that may effect the stcb/asoc. The
12378          * sb is locked however. When data is copied the protocol processing
12379          * should be enabled since this is a slower operation...
12380          */
12381         struct sctp_stream_queue_pending *sp = NULL;
12382         int resv_in_first;
12383
12384         *error = 0;
12385         /* Now can we send this? */
12386         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12387             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12388             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12389             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12390                 /* got data while shutting down */
12391                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12392                 *error = ECONNRESET;
12393                 goto out_now;
12394         }
12395         sctp_alloc_a_strmoq(stcb, sp);
12396         if (sp == NULL) {
12397                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12398                 *error = ENOMEM;
12399                 goto out_now;
12400         }
12401         sp->act_flags = 0;
12402         sp->sender_all_done = 0;
12403         sp->sinfo_flags = srcv->sinfo_flags;
12404         sp->timetolive = srcv->sinfo_timetolive;
12405         sp->ppid = srcv->sinfo_ppid;
12406         sp->context = srcv->sinfo_context;
12407         sp->fsn = 0;
12408         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12409
12410         sp->sid = srcv->sinfo_stream;
12411         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12412         if ((sp->length == (uint32_t)uio->uio_resid) &&
12413             ((user_marks_eor == 0) ||
12414             (srcv->sinfo_flags & SCTP_EOF) ||
12415             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12416                 sp->msg_is_complete = 1;
12417         } else {
12418                 sp->msg_is_complete = 0;
12419         }
12420         sp->sender_all_done = 0;
12421         sp->some_taken = 0;
12422         sp->put_last_out = 0;
12423         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12424         sp->data = sp->tail_mbuf = NULL;
12425         if (sp->length == 0) {
12426                 goto skip_copy;
12427         }
12428         if (srcv->sinfo_keynumber_valid) {
12429                 sp->auth_keyid = srcv->sinfo_keynumber;
12430         } else {
12431                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12432         }
12433         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12434                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12435                 sp->holds_key_ref = 1;
12436         }
12437         *error = sctp_copy_one(sp, uio, resv_in_first);
12438 skip_copy:
12439         if (*error) {
12440                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12441                 sp = NULL;
12442         } else {
12443                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12444                         sp->net = net;
12445                         atomic_add_int(&sp->net->ref_count, 1);
12446                 } else {
12447                         sp->net = NULL;
12448                 }
12449                 sctp_set_prsctp_policy(sp);
12450         }
12451 out_now:
12452         return (sp);
12453 }
12454
12455
12456 int
12457 sctp_sosend(struct socket *so,
12458     struct sockaddr *addr,
12459     struct uio *uio,
12460     struct mbuf *top,
12461     struct mbuf *control,
12462     int flags,
12463     struct thread *p
12464 )
12465 {
12466         int error, use_sndinfo = 0;
12467         struct sctp_sndrcvinfo sndrcvninfo;
12468         struct sockaddr *addr_to_use;
12469 #if defined(INET) && defined(INET6)
12470         struct sockaddr_in sin;
12471 #endif
12472
12473         if (control) {
12474                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12475                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12476                     sizeof(sndrcvninfo))) {
12477                         /* got one */
12478                         use_sndinfo = 1;
12479                 }
12480         }
12481         addr_to_use = addr;
12482 #if defined(INET) && defined(INET6)
12483         if ((addr) && (addr->sa_family == AF_INET6)) {
12484                 struct sockaddr_in6 *sin6;
12485
12486                 sin6 = (struct sockaddr_in6 *)addr;
12487                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12488                         in6_sin6_2_sin(&sin, sin6);
12489                         addr_to_use = (struct sockaddr *)&sin;
12490                 }
12491         }
12492 #endif
12493         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12494             control,
12495             flags,
12496             use_sndinfo ? &sndrcvninfo : NULL
12497             ,p
12498             );
12499         return (error);
12500 }
12501
12502
12503 int
12504 sctp_lower_sosend(struct socket *so,
12505     struct sockaddr *addr,
12506     struct uio *uio,
12507     struct mbuf *i_pak,
12508     struct mbuf *control,
12509     int flags,
12510     struct sctp_sndrcvinfo *srcv
12511     ,
12512     struct thread *p
12513 )
12514 {
12515         unsigned int sndlen = 0, max_len;
12516         int error, len;
12517         struct mbuf *top = NULL;
12518         int queue_only = 0, queue_only_for_init = 0;
12519         int free_cnt_applied = 0;
12520         int un_sent;
12521         int now_filled = 0;
12522         unsigned int inqueue_bytes = 0;
12523         struct sctp_block_entry be;
12524         struct sctp_inpcb *inp;
12525         struct sctp_tcb *stcb = NULL;
12526         struct timeval now;
12527         struct sctp_nets *net;
12528         struct sctp_association *asoc;
12529         struct sctp_inpcb *t_inp;
12530         int user_marks_eor;
12531         int create_lock_applied = 0;
12532         int nagle_applies = 0;
12533         int some_on_control = 0;
12534         int got_all_of_the_send = 0;
12535         int hold_tcblock = 0;
12536         int non_blocking = 0;
12537         uint32_t local_add_more, local_soresv = 0;
12538         uint16_t port;
12539         uint16_t sinfo_flags;
12540         sctp_assoc_t sinfo_assoc_id;
12541
12542         error = 0;
12543         net = NULL;
12544         stcb = NULL;
12545         asoc = NULL;
12546
12547         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12548         if (inp == NULL) {
12549                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12550                 error = EINVAL;
12551                 if (i_pak) {
12552                         SCTP_RELEASE_PKT(i_pak);
12553                 }
12554                 return (error);
12555         }
12556         if ((uio == NULL) && (i_pak == NULL)) {
12557                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12558                 return (EINVAL);
12559         }
12560         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12561         atomic_add_int(&inp->total_sends, 1);
12562         if (uio) {
12563                 if (uio->uio_resid < 0) {
12564                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12565                         return (EINVAL);
12566                 }
12567                 sndlen = (unsigned int)uio->uio_resid;
12568         } else {
12569                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12570                 sndlen = SCTP_HEADER_LEN(i_pak);
12571         }
12572         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12573             (void *)addr,
12574             sndlen);
12575         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12576             (inp->sctp_socket->so_qlimit)) {
12577                 /* The listener can NOT send */
12578                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12579                 error = ENOTCONN;
12580                 goto out_unlocked;
12581         }
12582         /**
12583          * Pre-screen address, if one is given the sin-len
12584          * must be set correctly!
12585          */
12586         if (addr) {
12587                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12588
12589                 switch (raddr->sa.sa_family) {
12590 #ifdef INET
12591                 case AF_INET:
12592                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12593                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12594                                 error = EINVAL;
12595                                 goto out_unlocked;
12596                         }
12597                         port = raddr->sin.sin_port;
12598                         break;
12599 #endif
12600 #ifdef INET6
12601                 case AF_INET6:
12602                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12603                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12604                                 error = EINVAL;
12605                                 goto out_unlocked;
12606                         }
12607                         port = raddr->sin6.sin6_port;
12608                         break;
12609 #endif
12610                 default:
12611                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12612                         error = EAFNOSUPPORT;
12613                         goto out_unlocked;
12614                 }
12615         } else
12616                 port = 0;
12617
12618         if (srcv) {
12619                 sinfo_flags = srcv->sinfo_flags;
12620                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12621                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12622                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12623                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12624                         error = EINVAL;
12625                         goto out_unlocked;
12626                 }
12627                 if (srcv->sinfo_flags)
12628                         SCTP_STAT_INCR(sctps_sends_with_flags);
12629         } else {
12630                 sinfo_flags = inp->def_send.sinfo_flags;
12631                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12632         }
12633         if (sinfo_flags & SCTP_SENDALL) {
12634                 /* its a sendall */
12635                 error = sctp_sendall(inp, uio, top, srcv);
12636                 top = NULL;
12637                 goto out_unlocked;
12638         }
12639         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12640                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12641                 error = EINVAL;
12642                 goto out_unlocked;
12643         }
12644         /* now we must find the assoc */
12645         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12646             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12647                 SCTP_INP_RLOCK(inp);
12648                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12649                 if (stcb) {
12650                         SCTP_TCB_LOCK(stcb);
12651                         hold_tcblock = 1;
12652                 }
12653                 SCTP_INP_RUNLOCK(inp);
12654         } else if (sinfo_assoc_id) {
12655                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12656                 if (stcb != NULL) {
12657                         hold_tcblock = 1;
12658                 }
12659         } else if (addr) {
12660                 /*-
12661                  * Since we did not use findep we must
12662                  * increment it, and if we don't find a tcb
12663                  * decrement it.
12664                  */
12665                 SCTP_INP_WLOCK(inp);
12666                 SCTP_INP_INCR_REF(inp);
12667                 SCTP_INP_WUNLOCK(inp);
12668                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12669                 if (stcb == NULL) {
12670                         SCTP_INP_WLOCK(inp);
12671                         SCTP_INP_DECR_REF(inp);
12672                         SCTP_INP_WUNLOCK(inp);
12673                 } else {
12674                         hold_tcblock = 1;
12675                 }
12676         }
12677         if ((stcb == NULL) && (addr)) {
12678                 /* Possible implicit send? */
12679                 SCTP_ASOC_CREATE_LOCK(inp);
12680                 create_lock_applied = 1;
12681                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12682                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12683                         /* Should I really unlock ? */
12684                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12685                         error = EINVAL;
12686                         goto out_unlocked;
12687
12688                 }
12689                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12690                     (addr->sa_family == AF_INET6)) {
12691                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12692                         error = EINVAL;
12693                         goto out_unlocked;
12694                 }
12695                 SCTP_INP_WLOCK(inp);
12696                 SCTP_INP_INCR_REF(inp);
12697                 SCTP_INP_WUNLOCK(inp);
12698                 /* With the lock applied look again */
12699                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12700                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12701                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12702                 }
12703                 if (stcb == NULL) {
12704                         SCTP_INP_WLOCK(inp);
12705                         SCTP_INP_DECR_REF(inp);
12706                         SCTP_INP_WUNLOCK(inp);
12707                 } else {
12708                         hold_tcblock = 1;
12709                 }
12710                 if (error) {
12711                         goto out_unlocked;
12712                 }
12713                 if (t_inp != inp) {
12714                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12715                         error = ENOTCONN;
12716                         goto out_unlocked;
12717                 }
12718         }
12719         if (stcb == NULL) {
12720                 if (addr == NULL) {
12721                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12722                         error = ENOENT;
12723                         goto out_unlocked;
12724                 } else {
12725                         /* We must go ahead and start the INIT process */
12726                         uint32_t vrf_id;
12727
12728                         if ((sinfo_flags & SCTP_ABORT) ||
12729                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12730                                 /*-
12731                                  * User asks to abort a non-existant assoc,
12732                                  * or EOF a non-existant assoc with no data
12733                                  */
12734                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12735                                 error = ENOENT;
12736                                 goto out_unlocked;
12737                         }
12738                         /* get an asoc/stcb struct */
12739                         vrf_id = inp->def_vrf_id;
12740 #ifdef INVARIANTS
12741                         if (create_lock_applied == 0) {
12742                                 panic("Error, should hold create lock and I don't?");
12743                         }
12744 #endif
12745                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12746                             inp->sctp_ep.pre_open_stream_count,
12747                             inp->sctp_ep.port,
12748                             p);
12749                         if (stcb == NULL) {
12750                                 /* Error is setup for us in the call */
12751                                 goto out_unlocked;
12752                         }
12753                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12754                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12755                                 /*
12756                                  * Set the connected flag so we can queue
12757                                  * data
12758                                  */
12759                                 soisconnecting(so);
12760                         }
12761                         hold_tcblock = 1;
12762                         if (create_lock_applied) {
12763                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12764                                 create_lock_applied = 0;
12765                         } else {
12766                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12767                         }
12768                         /*
12769                          * Turn on queue only flag to prevent data from
12770                          * being sent
12771                          */
12772                         queue_only = 1;
12773                         asoc = &stcb->asoc;
12774                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12775                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12776
12777                         /* initialize authentication params for the assoc */
12778                         sctp_initialize_auth_params(inp, stcb);
12779
12780                         if (control) {
12781                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12782                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12783                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12784                                         hold_tcblock = 0;
12785                                         stcb = NULL;
12786                                         goto out_unlocked;
12787                                 }
12788                         }
12789                         /* out with the INIT */
12790                         queue_only_for_init = 1;
12791                         /*-
12792                          * we may want to dig in after this call and adjust the MTU
12793                          * value. It defaulted to 1500 (constant) but the ro
12794                          * structure may now have an update and thus we may need to
12795                          * change it BEFORE we append the message.
12796                          */
12797                 }
12798         } else
12799                 asoc = &stcb->asoc;
12800         if (srcv == NULL)
12801                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12802         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12803                 if (addr)
12804                         net = sctp_findnet(stcb, addr);
12805                 else
12806                         net = NULL;
12807                 if ((net == NULL) ||
12808                     ((port != 0) && (port != stcb->rport))) {
12809                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12810                         error = EINVAL;
12811                         goto out_unlocked;
12812                 }
12813         } else {
12814                 if (stcb->asoc.alternate) {
12815                         net = stcb->asoc.alternate;
12816                 } else {
12817                         net = stcb->asoc.primary_destination;
12818                 }
12819         }
12820         atomic_add_int(&stcb->total_sends, 1);
12821         /* Keep the stcb from being freed under our feet */
12822         atomic_add_int(&asoc->refcnt, 1);
12823         free_cnt_applied = 1;
12824
12825         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12826                 if (sndlen > asoc->smallest_mtu) {
12827                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12828                         error = EMSGSIZE;
12829                         goto out_unlocked;
12830                 }
12831         }
12832         if (SCTP_SO_IS_NBIO(so)
12833             || (flags & MSG_NBIO)
12834             ) {
12835                 non_blocking = 1;
12836         }
12837         /* would we block? */
12838         if (non_blocking) {
12839                 uint32_t amount;
12840
12841                 if (hold_tcblock == 0) {
12842                         SCTP_TCB_LOCK(stcb);
12843                         hold_tcblock = 1;
12844                 }
12845                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12846                 if (user_marks_eor == 0) {
12847                         amount = sndlen;
12848                 } else {
12849                         amount = 1;
12850                 }
12851                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12852                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12853                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12854                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12855                                 error = EMSGSIZE;
12856                         else
12857                                 error = EWOULDBLOCK;
12858                         goto out_unlocked;
12859                 }
12860                 stcb->asoc.sb_send_resv += sndlen;
12861                 SCTP_TCB_UNLOCK(stcb);
12862                 hold_tcblock = 0;
12863         } else {
12864                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12865         }
12866         local_soresv = sndlen;
12867         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12868                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12869                 error = ECONNRESET;
12870                 goto out_unlocked;
12871         }
12872         if (create_lock_applied) {
12873                 SCTP_ASOC_CREATE_UNLOCK(inp);
12874                 create_lock_applied = 0;
12875         }
12876         /* Is the stream no. valid? */
12877         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12878                 /* Invalid stream number */
12879                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12880                 error = EINVAL;
12881                 goto out_unlocked;
12882         }
12883         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12884             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12885                 /*
12886                  * Can't queue any data while stream reset is underway.
12887                  */
12888                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12889                         error = EAGAIN;
12890                 } else {
12891                         error = EINVAL;
12892                 }
12893                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12894                 goto out_unlocked;
12895         }
12896         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12897             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12898                 queue_only = 1;
12899         }
12900         /* we are now done with all control */
12901         if (control) {
12902                 sctp_m_freem(control);
12903                 control = NULL;
12904         }
12905         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12906             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12907             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12908             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12909                 if (srcv->sinfo_flags & SCTP_ABORT) {
12910                         ;
12911                 } else {
12912                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12913                         error = ECONNRESET;
12914                         goto out_unlocked;
12915                 }
12916         }
12917         /* Ok, we will attempt a msgsnd :> */
12918         if (p) {
12919                 p->td_ru.ru_msgsnd++;
12920         }
12921         /* Are we aborting? */
12922         if (srcv->sinfo_flags & SCTP_ABORT) {
12923                 struct mbuf *mm;
12924                 int tot_demand, tot_out = 0, max_out;
12925
12926                 SCTP_STAT_INCR(sctps_sends_with_abort);
12927                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12928                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12929                         /* It has to be up before we abort */
12930                         /* how big is the user initiated abort? */
12931                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12932                         error = EINVAL;
12933                         goto out;
12934                 }
12935                 if (hold_tcblock) {
12936                         SCTP_TCB_UNLOCK(stcb);
12937                         hold_tcblock = 0;
12938                 }
12939                 if (top) {
12940                         struct mbuf *cntm = NULL;
12941
12942                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12943                         if (sndlen != 0) {
12944                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12945                                         tot_out += SCTP_BUF_LEN(cntm);
12946                                 }
12947                         }
12948                 } else {
12949                         /* Must fit in a MTU */
12950                         tot_out = sndlen;
12951                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12952                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12953                                 /* To big */
12954                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12955                                 error = EMSGSIZE;
12956                                 goto out;
12957                         }
12958                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12959                 }
12960                 if (mm == NULL) {
12961                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12962                         error = ENOMEM;
12963                         goto out;
12964                 }
12965                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12966                 max_out -= sizeof(struct sctp_abort_msg);
12967                 if (tot_out > max_out) {
12968                         tot_out = max_out;
12969                 }
12970                 if (mm) {
12971                         struct sctp_paramhdr *ph;
12972
12973                         /* now move forward the data pointer */
12974                         ph = mtod(mm, struct sctp_paramhdr *);
12975                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12976                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12977                         ph++;
12978                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12979                         if (top == NULL) {
12980                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12981                                 if (error) {
12982                                         /*-
12983                                          * Here if we can't get his data we
12984                                          * still abort we just don't get to
12985                                          * send the users note :-0
12986                                          */
12987                                         sctp_m_freem(mm);
12988                                         mm = NULL;
12989                                 }
12990                         } else {
12991                                 if (sndlen != 0) {
12992                                         SCTP_BUF_NEXT(mm) = top;
12993                                 }
12994                         }
12995                 }
12996                 if (hold_tcblock == 0) {
12997                         SCTP_TCB_LOCK(stcb);
12998                 }
12999                 atomic_add_int(&stcb->asoc.refcnt, -1);
13000                 free_cnt_applied = 0;
13001                 /* release this lock, otherwise we hang on ourselves */
13002                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13003                 /* now relock the stcb so everything is sane */
13004                 hold_tcblock = 0;
13005                 stcb = NULL;
13006                 /*
13007                  * In this case top is already chained to mm avoid double
13008                  * free, since we free it below if top != NULL and driver
13009                  * would free it after sending the packet out
13010                  */
13011                 if (sndlen != 0) {
13012                         top = NULL;
13013                 }
13014                 goto out_unlocked;
13015         }
13016         /* Calculate the maximum we can send */
13017         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13018         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13019                 if (non_blocking) {
13020                         /* we already checked for non-blocking above. */
13021                         max_len = sndlen;
13022                 } else {
13023                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13024                 }
13025         } else {
13026                 max_len = 0;
13027         }
13028         if (hold_tcblock) {
13029                 SCTP_TCB_UNLOCK(stcb);
13030                 hold_tcblock = 0;
13031         }
13032         if (asoc->strmout == NULL) {
13033                 /* huh? software error */
13034                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13035                 error = EFAULT;
13036                 goto out_unlocked;
13037         }
13038
13039         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13040         if ((user_marks_eor == 0) &&
13041             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13042                 /* It will NEVER fit */
13043                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13044                 error = EMSGSIZE;
13045                 goto out_unlocked;
13046         }
13047         if ((uio == NULL) && user_marks_eor) {
13048                 /*-
13049                  * We do not support eeor mode for
13050                  * sending with mbuf chains (like sendfile).
13051                  */
13052                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13053                 error = EINVAL;
13054                 goto out_unlocked;
13055         }
13056
13057         if (user_marks_eor) {
13058                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13059         } else {
13060                 /*-
13061                  * For non-eeor the whole message must fit in
13062                  * the socket send buffer.
13063                  */
13064                 local_add_more = sndlen;
13065         }
13066         len = 0;
13067         if (non_blocking) {
13068                 goto skip_preblock;
13069         }
13070         if (((max_len <= local_add_more) &&
13071             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13072             (max_len == 0) ||
13073             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13074                 /* No room right now ! */
13075                 SOCKBUF_LOCK(&so->so_snd);
13076                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13077                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13078                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13079                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13080                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13081                             inqueue_bytes,
13082                             local_add_more,
13083                             stcb->asoc.stream_queue_cnt,
13084                             stcb->asoc.chunks_on_out_queue,
13085                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13086                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13087                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13088                         }
13089                         be.error = 0;
13090                         stcb->block_entry = &be;
13091                         error = sbwait(&so->so_snd);
13092                         stcb->block_entry = NULL;
13093                         if (error || so->so_error || be.error) {
13094                                 if (error == 0) {
13095                                         if (so->so_error)
13096                                                 error = so->so_error;
13097                                         if (be.error) {
13098                                                 error = be.error;
13099                                         }
13100                                 }
13101                                 SOCKBUF_UNLOCK(&so->so_snd);
13102                                 goto out_unlocked;
13103                         }
13104                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13105                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13106                                     asoc, stcb->asoc.total_output_queue_size);
13107                         }
13108                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13109                                 SOCKBUF_UNLOCK(&so->so_snd);
13110                                 goto out_unlocked;
13111                         }
13112                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13113                 }
13114                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13115                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13116                 } else {
13117                         max_len = 0;
13118                 }
13119                 SOCKBUF_UNLOCK(&so->so_snd);
13120         }
13121
13122 skip_preblock:
13123         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13124                 goto out_unlocked;
13125         }
13126         /*
13127          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13128          * case NOTE: uio will be null when top/mbuf is passed
13129          */
13130         if (sndlen == 0) {
13131                 if (srcv->sinfo_flags & SCTP_EOF) {
13132                         got_all_of_the_send = 1;
13133                         goto dataless_eof;
13134                 } else {
13135                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13136                         error = EINVAL;
13137                         goto out;
13138                 }
13139         }
13140         if (top == NULL) {
13141                 struct sctp_stream_queue_pending *sp;
13142                 struct sctp_stream_out *strm;
13143                 uint32_t sndout;
13144
13145                 SCTP_TCB_SEND_LOCK(stcb);
13146                 if ((asoc->stream_locked) &&
13147                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13148                         SCTP_TCB_SEND_UNLOCK(stcb);
13149                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13150                         error = EINVAL;
13151                         goto out;
13152                 }
13153                 SCTP_TCB_SEND_UNLOCK(stcb);
13154
13155                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13156                 if (strm->last_msg_incomplete == 0) {
13157         do_a_copy_in:
13158                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13159                         if (error) {
13160                                 goto out;
13161                         }
13162                         SCTP_TCB_SEND_LOCK(stcb);
13163                         if (sp->msg_is_complete) {
13164                                 strm->last_msg_incomplete = 0;
13165                                 asoc->stream_locked = 0;
13166                         } else {
13167                                 /*
13168                                  * Just got locked to this guy in case of an
13169                                  * interrupt.
13170                                  */
13171                                 strm->last_msg_incomplete = 1;
13172                                 if (stcb->asoc.idata_supported == 0) {
13173                                         asoc->stream_locked = 1;
13174                                         asoc->stream_locked_on = srcv->sinfo_stream;
13175                                 }
13176                                 sp->sender_all_done = 0;
13177                         }
13178                         sctp_snd_sb_alloc(stcb, sp->length);
13179                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13180                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13181                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13182                         }
13183                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13184                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13185                         SCTP_TCB_SEND_UNLOCK(stcb);
13186                 } else {
13187                         SCTP_TCB_SEND_LOCK(stcb);
13188                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13189                         SCTP_TCB_SEND_UNLOCK(stcb);
13190                         if (sp == NULL) {
13191                                 /* ???? Huh ??? last msg is gone */
13192 #ifdef INVARIANTS
13193                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13194 #else
13195                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13196                                 strm->last_msg_incomplete = 0;
13197 #endif
13198                                 goto do_a_copy_in;
13199
13200                         }
13201                 }
13202                 while (uio->uio_resid > 0) {
13203                         /* How much room do we have? */
13204                         struct mbuf *new_tail, *mm;
13205
13206                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13207                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13208                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13209                         else
13210                                 max_len = 0;
13211
13212                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13213                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13214                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13215                                 sndout = 0;
13216                                 new_tail = NULL;
13217                                 if (hold_tcblock) {
13218                                         SCTP_TCB_UNLOCK(stcb);
13219                                         hold_tcblock = 0;
13220                                 }
13221                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13222                                 if ((mm == NULL) || error) {
13223                                         if (mm) {
13224                                                 sctp_m_freem(mm);
13225                                         }
13226                                         goto out;
13227                                 }
13228                                 /* Update the mbuf and count */
13229                                 SCTP_TCB_SEND_LOCK(stcb);
13230                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13231                                         /*
13232                                          * we need to get out. Peer probably
13233                                          * aborted.
13234                                          */
13235                                         sctp_m_freem(mm);
13236                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13237                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13238                                                 error = ECONNRESET;
13239                                         }
13240                                         SCTP_TCB_SEND_UNLOCK(stcb);
13241                                         goto out;
13242                                 }
13243                                 if (sp->tail_mbuf) {
13244                                         /* tack it to the end */
13245                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13246                                         sp->tail_mbuf = new_tail;
13247                                 } else {
13248                                         /* A stolen mbuf */
13249                                         sp->data = mm;
13250                                         sp->tail_mbuf = new_tail;
13251                                 }
13252                                 sctp_snd_sb_alloc(stcb, sndout);
13253                                 atomic_add_int(&sp->length, sndout);
13254                                 len += sndout;
13255                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13256                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13257                                 }
13258
13259                                 /* Did we reach EOR? */
13260                                 if ((uio->uio_resid == 0) &&
13261                                     ((user_marks_eor == 0) ||
13262                                     (srcv->sinfo_flags & SCTP_EOF) ||
13263                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13264                                         sp->msg_is_complete = 1;
13265                                 } else {
13266                                         sp->msg_is_complete = 0;
13267                                 }
13268                                 SCTP_TCB_SEND_UNLOCK(stcb);
13269                         }
13270                         if (uio->uio_resid == 0) {
13271                                 /* got it all? */
13272                                 continue;
13273                         }
13274                         /* PR-SCTP? */
13275                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13276                                 /*
13277                                  * This is ugly but we must assure locking
13278                                  * order
13279                                  */
13280                                 if (hold_tcblock == 0) {
13281                                         SCTP_TCB_LOCK(stcb);
13282                                         hold_tcblock = 1;
13283                                 }
13284                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13285                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13286                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13287                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13288                                 else
13289                                         max_len = 0;
13290                                 if (max_len > 0) {
13291                                         continue;
13292                                 }
13293                                 SCTP_TCB_UNLOCK(stcb);
13294                                 hold_tcblock = 0;
13295                         }
13296                         /* wait for space now */
13297                         if (non_blocking) {
13298                                 /* Non-blocking io in place out */
13299                                 goto skip_out_eof;
13300                         }
13301                         /* What about the INIT, send it maybe */
13302                         if (queue_only_for_init) {
13303                                 if (hold_tcblock == 0) {
13304                                         SCTP_TCB_LOCK(stcb);
13305                                         hold_tcblock = 1;
13306                                 }
13307                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13308                                         /* a collision took us forward? */
13309                                         queue_only = 0;
13310                                 } else {
13311                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13312                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13313                                         queue_only = 1;
13314                                 }
13315                         }
13316                         if ((net->flight_size > net->cwnd) &&
13317                             (asoc->sctp_cmt_on_off == 0)) {
13318                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13319                                 queue_only = 1;
13320                         } else if (asoc->ifp_had_enobuf) {
13321                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13322                                 if (net->flight_size > (2 * net->mtu)) {
13323                                         queue_only = 1;
13324                                 }
13325                                 asoc->ifp_had_enobuf = 0;
13326                         }
13327                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13328                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13329                             (stcb->asoc.total_flight > 0) &&
13330                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13331                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13332
13333                                 /*-
13334                                  * Ok, Nagle is set on and we have data outstanding.
13335                                  * Don't send anything and let SACKs drive out the
13336                                  * data unless we have a "full" segment to send.
13337                                  */
13338                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13339                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13340                                 }
13341                                 SCTP_STAT_INCR(sctps_naglequeued);
13342                                 nagle_applies = 1;
13343                         } else {
13344                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13345                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13346                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13347                                 }
13348                                 SCTP_STAT_INCR(sctps_naglesent);
13349                                 nagle_applies = 0;
13350                         }
13351                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13352
13353                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13354                                     nagle_applies, un_sent);
13355                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13356                                     stcb->asoc.total_flight,
13357                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13358                         }
13359                         if (queue_only_for_init)
13360                                 queue_only_for_init = 0;
13361                         if ((queue_only == 0) && (nagle_applies == 0)) {
13362                                 /*-
13363                                  * need to start chunk output
13364                                  * before blocking.. note that if
13365                                  * a lock is already applied, then
13366                                  * the input via the net is happening
13367                                  * and I don't need to start output :-D
13368                                  */
13369                                 if (hold_tcblock == 0) {
13370                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13371                                                 hold_tcblock = 1;
13372                                                 sctp_chunk_output(inp,
13373                                                     stcb,
13374                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13375                                         }
13376                                 } else {
13377                                         sctp_chunk_output(inp,
13378                                             stcb,
13379                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13380                                 }
13381                                 if (hold_tcblock == 1) {
13382                                         SCTP_TCB_UNLOCK(stcb);
13383                                         hold_tcblock = 0;
13384                                 }
13385                         }
13386                         SOCKBUF_LOCK(&so->so_snd);
13387                         /*-
13388                          * This is a bit strange, but I think it will
13389                          * work. The total_output_queue_size is locked and
13390                          * protected by the TCB_LOCK, which we just released.
13391                          * There is a race that can occur between releasing it
13392                          * above, and me getting the socket lock, where sacks
13393                          * come in but we have not put the SB_WAIT on the
13394                          * so_snd buffer to get the wakeup. After the LOCK
13395                          * is applied the sack_processing will also need to
13396                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13397                          * once we have the socket buffer lock if we recheck the
13398                          * size we KNOW we will get to sleep safely with the
13399                          * wakeup flag in place.
13400                          */
13401                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13402                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13403                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13404                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13405                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13406                                             asoc, (size_t)uio->uio_resid);
13407                                 }
13408                                 be.error = 0;
13409                                 stcb->block_entry = &be;
13410                                 error = sbwait(&so->so_snd);
13411                                 stcb->block_entry = NULL;
13412
13413                                 if (error || so->so_error || be.error) {
13414                                         if (error == 0) {
13415                                                 if (so->so_error)
13416                                                         error = so->so_error;
13417                                                 if (be.error) {
13418                                                         error = be.error;
13419                                                 }
13420                                         }
13421                                         SOCKBUF_UNLOCK(&so->so_snd);
13422                                         goto out_unlocked;
13423                                 }
13424
13425                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13426                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13427                                             asoc, stcb->asoc.total_output_queue_size);
13428                                 }
13429                         }
13430                         SOCKBUF_UNLOCK(&so->so_snd);
13431                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13432                                 goto out_unlocked;
13433                         }
13434                 }
13435                 SCTP_TCB_SEND_LOCK(stcb);
13436                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13437                         SCTP_TCB_SEND_UNLOCK(stcb);
13438                         goto out_unlocked;
13439                 }
13440                 if (sp) {
13441                         if (sp->msg_is_complete == 0) {
13442                                 strm->last_msg_incomplete = 1;
13443                                 if (stcb->asoc.idata_supported == 0) {
13444                                         asoc->stream_locked = 1;
13445                                         asoc->stream_locked_on = srcv->sinfo_stream;
13446                                 }
13447                         } else {
13448                                 sp->sender_all_done = 1;
13449                                 strm->last_msg_incomplete = 0;
13450                                 asoc->stream_locked = 0;
13451                         }
13452                 } else {
13453                         SCTP_PRINTF("Huh no sp TSNH?\n");
13454                         strm->last_msg_incomplete = 0;
13455                         asoc->stream_locked = 0;
13456                 }
13457                 SCTP_TCB_SEND_UNLOCK(stcb);
13458                 if (uio->uio_resid == 0) {
13459                         got_all_of_the_send = 1;
13460                 }
13461         } else {
13462                 /* We send in a 0, since we do NOT have any locks */
13463                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13464                 top = NULL;
13465                 if (srcv->sinfo_flags & SCTP_EOF) {
13466                         /*
13467                          * This should only happen for Panda for the mbuf
13468                          * send case, which does NOT yet support EEOR mode.
13469                          * Thus, we can just set this flag to do the proper
13470                          * EOF handling.
13471                          */
13472                         got_all_of_the_send = 1;
13473                 }
13474         }
13475         if (error) {
13476                 goto out;
13477         }
13478 dataless_eof:
13479         /* EOF thing ? */
13480         if ((srcv->sinfo_flags & SCTP_EOF) &&
13481             (got_all_of_the_send == 1)) {
13482                 SCTP_STAT_INCR(sctps_sends_with_eof);
13483                 error = 0;
13484                 if (hold_tcblock == 0) {
13485                         SCTP_TCB_LOCK(stcb);
13486                         hold_tcblock = 1;
13487                 }
13488                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13489                     TAILQ_EMPTY(&asoc->sent_queue) &&
13490                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13491                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13492                                 goto abort_anyway;
13493                         }
13494                         /* there is nothing queued to send, so I'm done... */
13495                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13496                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13497                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13498                                 struct sctp_nets *netp;
13499
13500                                 /* only send SHUTDOWN the first time through */
13501                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13502                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13503                                 }
13504                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13505                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13506                                 sctp_stop_timers_for_shutdown(stcb);
13507                                 if (stcb->asoc.alternate) {
13508                                         netp = stcb->asoc.alternate;
13509                                 } else {
13510                                         netp = stcb->asoc.primary_destination;
13511                                 }
13512                                 sctp_send_shutdown(stcb, netp);
13513                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13514                                     netp);
13515                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13516                                     asoc->primary_destination);
13517                         }
13518                 } else {
13519                         /*-
13520                          * we still got (or just got) data to send, so set
13521                          * SHUTDOWN_PENDING
13522                          */
13523                         /*-
13524                          * XXX sockets draft says that SCTP_EOF should be
13525                          * sent with no data.  currently, we will allow user
13526                          * data to be sent first and move to
13527                          * SHUTDOWN-PENDING
13528                          */
13529                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13530                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13531                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13532                                 if (hold_tcblock == 0) {
13533                                         SCTP_TCB_LOCK(stcb);
13534                                         hold_tcblock = 1;
13535                                 }
13536                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13537                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13538                                 }
13539                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13540                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13541                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13542                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13543                                         struct mbuf *op_err;
13544                                         char msg[SCTP_DIAG_INFO_LEN];
13545
13546                         abort_anyway:
13547                                         if (free_cnt_applied) {
13548                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13549                                                 free_cnt_applied = 0;
13550                                         }
13551                                         snprintf(msg, sizeof(msg),
13552                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13553                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13554                                             msg);
13555                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13556                                             op_err, SCTP_SO_LOCKED);
13557                                         /*
13558                                          * now relock the stcb so everything
13559                                          * is sane
13560                                          */
13561                                         hold_tcblock = 0;
13562                                         stcb = NULL;
13563                                         goto out;
13564                                 }
13565                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13566                                     asoc->primary_destination);
13567                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13568                         }
13569                 }
13570         }
13571 skip_out_eof:
13572         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13573                 some_on_control = 1;
13574         }
13575         if (queue_only_for_init) {
13576                 if (hold_tcblock == 0) {
13577                         SCTP_TCB_LOCK(stcb);
13578                         hold_tcblock = 1;
13579                 }
13580                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13581                         /* a collision took us forward? */
13582                         queue_only = 0;
13583                 } else {
13584                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13585                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13586                         queue_only = 1;
13587                 }
13588         }
13589         if ((net->flight_size > net->cwnd) &&
13590             (stcb->asoc.sctp_cmt_on_off == 0)) {
13591                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13592                 queue_only = 1;
13593         } else if (asoc->ifp_had_enobuf) {
13594                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13595                 if (net->flight_size > (2 * net->mtu)) {
13596                         queue_only = 1;
13597                 }
13598                 asoc->ifp_had_enobuf = 0;
13599         }
13600         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13601         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13602             (stcb->asoc.total_flight > 0) &&
13603             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13604             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13605                 /*-
13606                  * Ok, Nagle is set on and we have data outstanding.
13607                  * Don't send anything and let SACKs drive out the
13608                  * data unless wen have a "full" segment to send.
13609                  */
13610                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13611                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13612                 }
13613                 SCTP_STAT_INCR(sctps_naglequeued);
13614                 nagle_applies = 1;
13615         } else {
13616                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13617                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13618                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13619                 }
13620                 SCTP_STAT_INCR(sctps_naglesent);
13621                 nagle_applies = 0;
13622         }
13623         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13624                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13625                     nagle_applies, un_sent);
13626                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13627                     stcb->asoc.total_flight,
13628                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13629         }
13630         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13631                 /* we can attempt to send too. */
13632                 if (hold_tcblock == 0) {
13633                         /*
13634                          * If there is activity recv'ing sacks no need to
13635                          * send
13636                          */
13637                         if (SCTP_TCB_TRYLOCK(stcb)) {
13638                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13639                                 hold_tcblock = 1;
13640                         }
13641                 } else {
13642                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13643                 }
13644         } else if ((queue_only == 0) &&
13645                     (stcb->asoc.peers_rwnd == 0) &&
13646             (stcb->asoc.total_flight == 0)) {
13647                 /* We get to have a probe outstanding */
13648                 if (hold_tcblock == 0) {
13649                         hold_tcblock = 1;
13650                         SCTP_TCB_LOCK(stcb);
13651                 }
13652                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13653         } else if (some_on_control) {
13654                 int num_out, reason, frag_point;
13655
13656                 /* Here we do control only */
13657                 if (hold_tcblock == 0) {
13658                         hold_tcblock = 1;
13659                         SCTP_TCB_LOCK(stcb);
13660                 }
13661                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13662                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13663                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13664         }
13665         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13666             queue_only, stcb->asoc.peers_rwnd, un_sent,
13667             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13668             stcb->asoc.total_output_queue_size, error);
13669
13670 out:
13671 out_unlocked:
13672
13673         if (local_soresv && stcb) {
13674                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13675         }
13676         if (create_lock_applied) {
13677                 SCTP_ASOC_CREATE_UNLOCK(inp);
13678         }
13679         if ((stcb) && hold_tcblock) {
13680                 SCTP_TCB_UNLOCK(stcb);
13681         }
13682         if (stcb && free_cnt_applied) {
13683                 atomic_add_int(&stcb->asoc.refcnt, -1);
13684         }
13685 #ifdef INVARIANTS
13686         if (stcb) {
13687                 if (mtx_owned(&stcb->tcb_mtx)) {
13688                         panic("Leaving with tcb mtx owned?");
13689                 }
13690                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13691                         panic("Leaving with tcb send mtx owned?");
13692                 }
13693         }
13694 #endif
13695         if (top) {
13696                 sctp_m_freem(top);
13697         }
13698         if (control) {
13699                 sctp_m_freem(control);
13700         }
13701         return (error);
13702 }
13703
13704
13705 /*
13706  * generate an AUTHentication chunk, if required
13707  */
13708 struct mbuf *
13709 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13710     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13711     struct sctp_tcb *stcb, uint8_t chunk)
13712 {
13713         struct mbuf *m_auth;
13714         struct sctp_auth_chunk *auth;
13715         int chunk_len;
13716         struct mbuf *cn;
13717
13718         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13719             (stcb == NULL))
13720                 return (m);
13721
13722         if (stcb->asoc.auth_supported == 0) {
13723                 return (m);
13724         }
13725         /* does the requested chunk require auth? */
13726         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13727                 return (m);
13728         }
13729         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13730         if (m_auth == NULL) {
13731                 /* no mbuf's */
13732                 return (m);
13733         }
13734         /* reserve some space if this will be the first mbuf */
13735         if (m == NULL)
13736                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13737         /* fill in the AUTH chunk details */
13738         auth = mtod(m_auth, struct sctp_auth_chunk *);
13739         memset(auth, 0, sizeof(*auth));
13740         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13741         auth->ch.chunk_flags = 0;
13742         chunk_len = sizeof(*auth) +
13743             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13744         auth->ch.chunk_length = htons(chunk_len);
13745         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13746         /* key id and hmac digest will be computed and filled in upon send */
13747
13748         /* save the offset where the auth was inserted into the chain */
13749         *offset = 0;
13750         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13751                 *offset += SCTP_BUF_LEN(cn);
13752         }
13753
13754         /* update length and return pointer to the auth chunk */
13755         SCTP_BUF_LEN(m_auth) = chunk_len;
13756         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13757         if (auth_ret != NULL)
13758                 *auth_ret = auth;
13759
13760         return (m);
13761 }
13762
13763 #ifdef INET6
13764 int
13765 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13766 {
13767         struct nd_prefix *pfx = NULL;
13768         struct nd_pfxrouter *pfxrtr = NULL;
13769         struct sockaddr_in6 gw6;
13770
13771         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13772                 return (0);
13773
13774         /* get prefix entry of address */
13775         ND6_RLOCK();
13776         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13777                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13778                         continue;
13779                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13780                     &src6->sin6_addr, &pfx->ndpr_mask))
13781                         break;
13782         }
13783         /* no prefix entry in the prefix list */
13784         if (pfx == NULL) {
13785                 ND6_RUNLOCK();
13786                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13787                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13788                 return (0);
13789         }
13790
13791         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13792         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13793
13794         /* search installed gateway from prefix entry */
13795         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13796                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13797                 gw6.sin6_family = AF_INET6;
13798                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13799                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13800                     sizeof(struct in6_addr));
13801                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13802                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13803                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13804                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13805                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13806                         ND6_RUNLOCK();
13807                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13808                         ND6_RUNLOCK();
13809                         return (1);
13810                 }
13811         }
13812         ND6_RUNLOCK();
13813         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13814         return (0);
13815 }
13816 #endif
13817
13818 int
13819 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13820 {
13821 #ifdef INET
13822         struct sockaddr_in *sin, *mask;
13823         struct ifaddr *ifa;
13824         struct in_addr srcnetaddr, gwnetaddr;
13825
13826         if (ro == NULL || ro->ro_rt == NULL ||
13827             sifa->address.sa.sa_family != AF_INET) {
13828                 return (0);
13829         }
13830         ifa = (struct ifaddr *)sifa->ifa;
13831         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13832         sin = &sifa->address.sin;
13833         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13834         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13835         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13836         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13837
13838         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13839         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13840         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13841         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13842         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13843         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13844                 return (1);
13845         }
13846 #endif
13847         return (0);
13848 }