sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59
  60
  61 #define SCTP_MAX_GAPS_INARRAY 4
  62 struct sack_track {
  63         uint8_t right_edge;     /* mergable on the right edge */
  64         uint8_t left_edge;      /* mergable on the left edge */
  65         uint8_t num_entries;
  66         uint8_t spare;
  67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  68 };
  69
  70 const struct sack_track sack_array[256] = {
  71         {0, 0, 0, 0,            /* 0x00 */
  72                 {{0, 0},
  73                 {0, 0},
  74                 {0, 0},
  75                 {0, 0}
  76                 }
  77         },
  78         {1, 0, 1, 0,            /* 0x01 */
  79                 {{0, 0},
  80                 {0, 0},
  81                 {0, 0},
  82                 {0, 0}
  83                 }
  84         },
  85         {0, 0, 1, 0,            /* 0x02 */
  86                 {{1, 1},
  87                 {0, 0},
  88                 {0, 0},
  89                 {0, 0}
  90                 }
  91         },
  92         {1, 0, 1, 0,            /* 0x03 */
  93                 {{0, 1},
  94                 {0, 0},
  95                 {0, 0},
  96                 {0, 0}
  97                 }
  98         },
  99         {0, 0, 1, 0,            /* 0x04 */
 100                 {{2, 2},
 101                 {0, 0},
 102                 {0, 0},
 103                 {0, 0}
 104                 }
 105         },
 106         {1, 0, 2, 0,            /* 0x05 */
 107                 {{0, 0},
 108                 {2, 2},
 109                 {0, 0},
 110                 {0, 0}
 111                 }
 112         },
 113         {0, 0, 1, 0,            /* 0x06 */
 114                 {{1, 2},
 115                 {0, 0},
 116                 {0, 0},
 117                 {0, 0}
 118                 }
 119         },
 120         {1, 0, 1, 0,            /* 0x07 */
 121                 {{0, 2},
 122                 {0, 0},
 123                 {0, 0},
 124                 {0, 0}
 125                 }
 126         },
 127         {0, 0, 1, 0,            /* 0x08 */
 128                 {{3, 3},
 129                 {0, 0},
 130                 {0, 0},
 131                 {0, 0}
 132                 }
 133         },
 134         {1, 0, 2, 0,            /* 0x09 */
 135                 {{0, 0},
 136                 {3, 3},
 137                 {0, 0},
 138                 {0, 0}
 139                 }
 140         },
 141         {0, 0, 2, 0,            /* 0x0a */
 142                 {{1, 1},
 143                 {3, 3},
 144                 {0, 0},
 145                 {0, 0}
 146                 }
 147         },
 148         {1, 0, 2, 0,            /* 0x0b */
 149                 {{0, 1},
 150                 {3, 3},
 151                 {0, 0},
 152                 {0, 0}
 153                 }
 154         },
 155         {0, 0, 1, 0,            /* 0x0c */
 156                 {{2, 3},
 157                 {0, 0},
 158                 {0, 0},
 159                 {0, 0}
 160                 }
 161         },
 162         {1, 0, 2, 0,            /* 0x0d */
 163                 {{0, 0},
 164                 {2, 3},
 165                 {0, 0},
 166                 {0, 0}
 167                 }
 168         },
 169         {0, 0, 1, 0,            /* 0x0e */
 170                 {{1, 3},
 171                 {0, 0},
 172                 {0, 0},
 173                 {0, 0}
 174                 }
 175         },
 176         {1, 0, 1, 0,            /* 0x0f */
 177                 {{0, 3},
 178                 {0, 0},
 179                 {0, 0},
 180                 {0, 0}
 181                 }
 182         },
 183         {0, 0, 1, 0,            /* 0x10 */
 184                 {{4, 4},
 185                 {0, 0},
 186                 {0, 0},
 187                 {0, 0}
 188                 }
 189         },
 190         {1, 0, 2, 0,            /* 0x11 */
 191                 {{0, 0},
 192                 {4, 4},
 193                 {0, 0},
 194                 {0, 0}
 195                 }
 196         },
 197         {0, 0, 2, 0,            /* 0x12 */
 198                 {{1, 1},
 199                 {4, 4},
 200                 {0, 0},
 201                 {0, 0}
 202                 }
 203         },
 204         {1, 0, 2, 0,            /* 0x13 */
 205                 {{0, 1},
 206                 {4, 4},
 207                 {0, 0},
 208                 {0, 0}
 209                 }
 210         },
 211         {0, 0, 2, 0,            /* 0x14 */
 212                 {{2, 2},
 213                 {4, 4},
 214                 {0, 0},
 215                 {0, 0}
 216                 }
 217         },
 218         {1, 0, 3, 0,            /* 0x15 */
 219                 {{0, 0},
 220                 {2, 2},
 221                 {4, 4},
 222                 {0, 0}
 223                 }
 224         },
 225         {0, 0, 2, 0,            /* 0x16 */
 226                 {{1, 2},
 227                 {4, 4},
 228                 {0, 0},
 229                 {0, 0}
 230                 }
 231         },
 232         {1, 0, 2, 0,            /* 0x17 */
 233                 {{0, 2},
 234                 {4, 4},
 235                 {0, 0},
 236                 {0, 0}
 237                 }
 238         },
 239         {0, 0, 1, 0,            /* 0x18 */
 240                 {{3, 4},
 241                 {0, 0},
 242                 {0, 0},
 243                 {0, 0}
 244                 }
 245         },
 246         {1, 0, 2, 0,            /* 0x19 */
 247                 {{0, 0},
 248                 {3, 4},
 249                 {0, 0},
 250                 {0, 0}
 251                 }
 252         },
 253         {0, 0, 2, 0,            /* 0x1a */
 254                 {{1, 1},
 255                 {3, 4},
 256                 {0, 0},
 257                 {0, 0}
 258                 }
 259         },
 260         {1, 0, 2, 0,            /* 0x1b */
 261                 {{0, 1},
 262                 {3, 4},
 263                 {0, 0},
 264                 {0, 0}
 265                 }
 266         },
 267         {0, 0, 1, 0,            /* 0x1c */
 268                 {{2, 4},
 269                 {0, 0},
 270                 {0, 0},
 271                 {0, 0}
 272                 }
 273         },
 274         {1, 0, 2, 0,            /* 0x1d */
 275                 {{0, 0},
 276                 {2, 4},
 277                 {0, 0},
 278                 {0, 0}
 279                 }
 280         },
 281         {0, 0, 1, 0,            /* 0x1e */
 282                 {{1, 4},
 283                 {0, 0},
 284                 {0, 0},
 285                 {0, 0}
 286                 }
 287         },
 288         {1, 0, 1, 0,            /* 0x1f */
 289                 {{0, 4},
 290                 {0, 0},
 291                 {0, 0},
 292                 {0, 0}
 293                 }
 294         },
 295         {0, 0, 1, 0,            /* 0x20 */
 296                 {{5, 5},
 297                 {0, 0},
 298                 {0, 0},
 299                 {0, 0}
 300                 }
 301         },
 302         {1, 0, 2, 0,            /* 0x21 */
 303                 {{0, 0},
 304                 {5, 5},
 305                 {0, 0},
 306                 {0, 0}
 307                 }
 308         },
 309         {0, 0, 2, 0,            /* 0x22 */
 310                 {{1, 1},
 311                 {5, 5},
 312                 {0, 0},
 313                 {0, 0}
 314                 }
 315         },
 316         {1, 0, 2, 0,            /* 0x23 */
 317                 {{0, 1},
 318                 {5, 5},
 319                 {0, 0},
 320                 {0, 0}
 321                 }
 322         },
 323         {0, 0, 2, 0,            /* 0x24 */
 324                 {{2, 2},
 325                 {5, 5},
 326                 {0, 0},
 327                 {0, 0}
 328                 }
 329         },
 330         {1, 0, 3, 0,            /* 0x25 */
 331                 {{0, 0},
 332                 {2, 2},
 333                 {5, 5},
 334                 {0, 0}
 335                 }
 336         },
 337         {0, 0, 2, 0,            /* 0x26 */
 338                 {{1, 2},
 339                 {5, 5},
 340                 {0, 0},
 341                 {0, 0}
 342                 }
 343         },
 344         {1, 0, 2, 0,            /* 0x27 */
 345                 {{0, 2},
 346                 {5, 5},
 347                 {0, 0},
 348                 {0, 0}
 349                 }
 350         },
 351         {0, 0, 2, 0,            /* 0x28 */
 352                 {{3, 3},
 353                 {5, 5},
 354                 {0, 0},
 355                 {0, 0}
 356                 }
 357         },
 358         {1, 0, 3, 0,            /* 0x29 */
 359                 {{0, 0},
 360                 {3, 3},
 361                 {5, 5},
 362                 {0, 0}
 363                 }
 364         },
 365         {0, 0, 3, 0,            /* 0x2a */
 366                 {{1, 1},
 367                 {3, 3},
 368                 {5, 5},
 369                 {0, 0}
 370                 }
 371         },
 372         {1, 0, 3, 0,            /* 0x2b */
 373                 {{0, 1},
 374                 {3, 3},
 375                 {5, 5},
 376                 {0, 0}
 377                 }
 378         },
 379         {0, 0, 2, 0,            /* 0x2c */
 380                 {{2, 3},
 381                 {5, 5},
 382                 {0, 0},
 383                 {0, 0}
 384                 }
 385         },
 386         {1, 0, 3, 0,            /* 0x2d */
 387                 {{0, 0},
 388                 {2, 3},
 389                 {5, 5},
 390                 {0, 0}
 391                 }
 392         },
 393         {0, 0, 2, 0,            /* 0x2e */
 394                 {{1, 3},
 395                 {5, 5},
 396                 {0, 0},
 397                 {0, 0}
 398                 }
 399         },
 400         {1, 0, 2, 0,            /* 0x2f */
 401                 {{0, 3},
 402                 {5, 5},
 403                 {0, 0},
 404                 {0, 0}
 405                 }
 406         },
 407         {0, 0, 1, 0,            /* 0x30 */
 408                 {{4, 5},
 409                 {0, 0},
 410                 {0, 0},
 411                 {0, 0}
 412                 }
 413         },
 414         {1, 0, 2, 0,            /* 0x31 */
 415                 {{0, 0},
 416                 {4, 5},
 417                 {0, 0},
 418                 {0, 0}
 419                 }
 420         },
 421         {0, 0, 2, 0,            /* 0x32 */
 422                 {{1, 1},
 423                 {4, 5},
 424                 {0, 0},
 425                 {0, 0}
 426                 }
 427         },
 428         {1, 0, 2, 0,            /* 0x33 */
 429                 {{0, 1},
 430                 {4, 5},
 431                 {0, 0},
 432                 {0, 0}
 433                 }
 434         },
 435         {0, 0, 2, 0,            /* 0x34 */
 436                 {{2, 2},
 437                 {4, 5},
 438                 {0, 0},
 439                 {0, 0}
 440                 }
 441         },
 442         {1, 0, 3, 0,            /* 0x35 */
 443                 {{0, 0},
 444                 {2, 2},
 445                 {4, 5},
 446                 {0, 0}
 447                 }
 448         },
 449         {0, 0, 2, 0,            /* 0x36 */
 450                 {{1, 2},
 451                 {4, 5},
 452                 {0, 0},
 453                 {0, 0}
 454                 }
 455         },
 456         {1, 0, 2, 0,            /* 0x37 */
 457                 {{0, 2},
 458                 {4, 5},
 459                 {0, 0},
 460                 {0, 0}
 461                 }
 462         },
 463         {0, 0, 1, 0,            /* 0x38 */
 464                 {{3, 5},
 465                 {0, 0},
 466                 {0, 0},
 467                 {0, 0}
 468                 }
 469         },
 470         {1, 0, 2, 0,            /* 0x39 */
 471                 {{0, 0},
 472                 {3, 5},
 473                 {0, 0},
 474                 {0, 0}
 475                 }
 476         },
 477         {0, 0, 2, 0,            /* 0x3a */
 478                 {{1, 1},
 479                 {3, 5},
 480                 {0, 0},
 481                 {0, 0}
 482                 }
 483         },
 484         {1, 0, 2, 0,            /* 0x3b */
 485                 {{0, 1},
 486                 {3, 5},
 487                 {0, 0},
 488                 {0, 0}
 489                 }
 490         },
 491         {0, 0, 1, 0,            /* 0x3c */
 492                 {{2, 5},
 493                 {0, 0},
 494                 {0, 0},
 495                 {0, 0}
 496                 }
 497         },
 498         {1, 0, 2, 0,            /* 0x3d */
 499                 {{0, 0},
 500                 {2, 5},
 501                 {0, 0},
 502                 {0, 0}
 503                 }
 504         },
 505         {0, 0, 1, 0,            /* 0x3e */
 506                 {{1, 5},
 507                 {0, 0},
 508                 {0, 0},
 509                 {0, 0}
 510                 }
 511         },
 512         {1, 0, 1, 0,            /* 0x3f */
 513                 {{0, 5},
 514                 {0, 0},
 515                 {0, 0},
 516                 {0, 0}
 517                 }
 518         },
 519         {0, 0, 1, 0,            /* 0x40 */
 520                 {{6, 6},
 521                 {0, 0},
 522                 {0, 0},
 523                 {0, 0}
 524                 }
 525         },
 526         {1, 0, 2, 0,            /* 0x41 */
 527                 {{0, 0},
 528                 {6, 6},
 529                 {0, 0},
 530                 {0, 0}
 531                 }
 532         },
 533         {0, 0, 2, 0,            /* 0x42 */
 534                 {{1, 1},
 535                 {6, 6},
 536                 {0, 0},
 537                 {0, 0}
 538                 }
 539         },
 540         {1, 0, 2, 0,            /* 0x43 */
 541                 {{0, 1},
 542                 {6, 6},
 543                 {0, 0},
 544                 {0, 0}
 545                 }
 546         },
 547         {0, 0, 2, 0,            /* 0x44 */
 548                 {{2, 2},
 549                 {6, 6},
 550                 {0, 0},
 551                 {0, 0}
 552                 }
 553         },
 554         {1, 0, 3, 0,            /* 0x45 */
 555                 {{0, 0},
 556                 {2, 2},
 557                 {6, 6},
 558                 {0, 0}
 559                 }
 560         },
 561         {0, 0, 2, 0,            /* 0x46 */
 562                 {{1, 2},
 563                 {6, 6},
 564                 {0, 0},
 565                 {0, 0}
 566                 }
 567         },
 568         {1, 0, 2, 0,            /* 0x47 */
 569                 {{0, 2},
 570                 {6, 6},
 571                 {0, 0},
 572                 {0, 0}
 573                 }
 574         },
 575         {0, 0, 2, 0,            /* 0x48 */
 576                 {{3, 3},
 577                 {6, 6},
 578                 {0, 0},
 579                 {0, 0}
 580                 }
 581         },
 582         {1, 0, 3, 0,            /* 0x49 */
 583                 {{0, 0},
 584                 {3, 3},
 585                 {6, 6},
 586                 {0, 0}
 587                 }
 588         },
 589         {0, 0, 3, 0,            /* 0x4a */
 590                 {{1, 1},
 591                 {3, 3},
 592                 {6, 6},
 593                 {0, 0}
 594                 }
 595         },
 596         {1, 0, 3, 0,            /* 0x4b */
 597                 {{0, 1},
 598                 {3, 3},
 599                 {6, 6},
 600                 {0, 0}
 601                 }
 602         },
 603         {0, 0, 2, 0,            /* 0x4c */
 604                 {{2, 3},
 605                 {6, 6},
 606                 {0, 0},
 607                 {0, 0}
 608                 }
 609         },
 610         {1, 0, 3, 0,            /* 0x4d */
 611                 {{0, 0},
 612                 {2, 3},
 613                 {6, 6},
 614                 {0, 0}
 615                 }
 616         },
 617         {0, 0, 2, 0,            /* 0x4e */
 618                 {{1, 3},
 619                 {6, 6},
 620                 {0, 0},
 621                 {0, 0}
 622                 }
 623         },
 624         {1, 0, 2, 0,            /* 0x4f */
 625                 {{0, 3},
 626                 {6, 6},
 627                 {0, 0},
 628                 {0, 0}
 629                 }
 630         },
 631         {0, 0, 2, 0,            /* 0x50 */
 632                 {{4, 4},
 633                 {6, 6},
 634                 {0, 0},
 635                 {0, 0}
 636                 }
 637         },
 638         {1, 0, 3, 0,            /* 0x51 */
 639                 {{0, 0},
 640                 {4, 4},
 641                 {6, 6},
 642                 {0, 0}
 643                 }
 644         },
 645         {0, 0, 3, 0,            /* 0x52 */
 646                 {{1, 1},
 647                 {4, 4},
 648                 {6, 6},
 649                 {0, 0}
 650                 }
 651         },
 652         {1, 0, 3, 0,            /* 0x53 */
 653                 {{0, 1},
 654                 {4, 4},
 655                 {6, 6},
 656                 {0, 0}
 657                 }
 658         },
 659         {0, 0, 3, 0,            /* 0x54 */
 660                 {{2, 2},
 661                 {4, 4},
 662                 {6, 6},
 663                 {0, 0}
 664                 }
 665         },
 666         {1, 0, 4, 0,            /* 0x55 */
 667                 {{0, 0},
 668                 {2, 2},
 669                 {4, 4},
 670                 {6, 6}
 671                 }
 672         },
 673         {0, 0, 3, 0,            /* 0x56 */
 674                 {{1, 2},
 675                 {4, 4},
 676                 {6, 6},
 677                 {0, 0}
 678                 }
 679         },
 680         {1, 0, 3, 0,            /* 0x57 */
 681                 {{0, 2},
 682                 {4, 4},
 683                 {6, 6},
 684                 {0, 0}
 685                 }
 686         },
 687         {0, 0, 2, 0,            /* 0x58 */
 688                 {{3, 4},
 689                 {6, 6},
 690                 {0, 0},
 691                 {0, 0}
 692                 }
 693         },
 694         {1, 0, 3, 0,            /* 0x59 */
 695                 {{0, 0},
 696                 {3, 4},
 697                 {6, 6},
 698                 {0, 0}
 699                 }
 700         },
 701         {0, 0, 3, 0,            /* 0x5a */
 702                 {{1, 1},
 703                 {3, 4},
 704                 {6, 6},
 705                 {0, 0}
 706                 }
 707         },
 708         {1, 0, 3, 0,            /* 0x5b */
 709                 {{0, 1},
 710                 {3, 4},
 711                 {6, 6},
 712                 {0, 0}
 713                 }
 714         },
 715         {0, 0, 2, 0,            /* 0x5c */
 716                 {{2, 4},
 717                 {6, 6},
 718                 {0, 0},
 719                 {0, 0}
 720                 }
 721         },
 722         {1, 0, 3, 0,            /* 0x5d */
 723                 {{0, 0},
 724                 {2, 4},
 725                 {6, 6},
 726                 {0, 0}
 727                 }
 728         },
 729         {0, 0, 2, 0,            /* 0x5e */
 730                 {{1, 4},
 731                 {6, 6},
 732                 {0, 0},
 733                 {0, 0}
 734                 }
 735         },
 736         {1, 0, 2, 0,            /* 0x5f */
 737                 {{0, 4},
 738                 {6, 6},
 739                 {0, 0},
 740                 {0, 0}
 741                 }
 742         },
 743         {0, 0, 1, 0,            /* 0x60 */
 744                 {{5, 6},
 745                 {0, 0},
 746                 {0, 0},
 747                 {0, 0}
 748                 }
 749         },
 750         {1, 0, 2, 0,            /* 0x61 */
 751                 {{0, 0},
 752                 {5, 6},
 753                 {0, 0},
 754                 {0, 0}
 755                 }
 756         },
 757         {0, 0, 2, 0,            /* 0x62 */
 758                 {{1, 1},
 759                 {5, 6},
 760                 {0, 0},
 761                 {0, 0}
 762                 }
 763         },
 764         {1, 0, 2, 0,            /* 0x63 */
 765                 {{0, 1},
 766                 {5, 6},
 767                 {0, 0},
 768                 {0, 0}
 769                 }
 770         },
 771         {0, 0, 2, 0,            /* 0x64 */
 772                 {{2, 2},
 773                 {5, 6},
 774                 {0, 0},
 775                 {0, 0}
 776                 }
 777         },
 778         {1, 0, 3, 0,            /* 0x65 */
 779                 {{0, 0},
 780                 {2, 2},
 781                 {5, 6},
 782                 {0, 0}
 783                 }
 784         },
 785         {0, 0, 2, 0,            /* 0x66 */
 786                 {{1, 2},
 787                 {5, 6},
 788                 {0, 0},
 789                 {0, 0}
 790                 }
 791         },
 792         {1, 0, 2, 0,            /* 0x67 */
 793                 {{0, 2},
 794                 {5, 6},
 795                 {0, 0},
 796                 {0, 0}
 797                 }
 798         },
 799         {0, 0, 2, 0,            /* 0x68 */
 800                 {{3, 3},
 801                 {5, 6},
 802                 {0, 0},
 803                 {0, 0}
 804                 }
 805         },
 806         {1, 0, 3, 0,            /* 0x69 */
 807                 {{0, 0},
 808                 {3, 3},
 809                 {5, 6},
 810                 {0, 0}
 811                 }
 812         },
 813         {0, 0, 3, 0,            /* 0x6a */
 814                 {{1, 1},
 815                 {3, 3},
 816                 {5, 6},
 817                 {0, 0}
 818                 }
 819         },
 820         {1, 0, 3, 0,            /* 0x6b */
 821                 {{0, 1},
 822                 {3, 3},
 823                 {5, 6},
 824                 {0, 0}
 825                 }
 826         },
 827         {0, 0, 2, 0,            /* 0x6c */
 828                 {{2, 3},
 829                 {5, 6},
 830                 {0, 0},
 831                 {0, 0}
 832                 }
 833         },
 834         {1, 0, 3, 0,            /* 0x6d */
 835                 {{0, 0},
 836                 {2, 3},
 837                 {5, 6},
 838                 {0, 0}
 839                 }
 840         },
 841         {0, 0, 2, 0,            /* 0x6e */
 842                 {{1, 3},
 843                 {5, 6},
 844                 {0, 0},
 845                 {0, 0}
 846                 }
 847         },
 848         {1, 0, 2, 0,            /* 0x6f */
 849                 {{0, 3},
 850                 {5, 6},
 851                 {0, 0},
 852                 {0, 0}
 853                 }
 854         },
 855         {0, 0, 1, 0,            /* 0x70 */
 856                 {{4, 6},
 857                 {0, 0},
 858                 {0, 0},
 859                 {0, 0}
 860                 }
 861         },
 862         {1, 0, 2, 0,            /* 0x71 */
 863                 {{0, 0},
 864                 {4, 6},
 865                 {0, 0},
 866                 {0, 0}
 867                 }
 868         },
 869         {0, 0, 2, 0,            /* 0x72 */
 870                 {{1, 1},
 871                 {4, 6},
 872                 {0, 0},
 873                 {0, 0}
 874                 }
 875         },
 876         {1, 0, 2, 0,            /* 0x73 */
 877                 {{0, 1},
 878                 {4, 6},
 879                 {0, 0},
 880                 {0, 0}
 881                 }
 882         },
 883         {0, 0, 2, 0,            /* 0x74 */
 884                 {{2, 2},
 885                 {4, 6},
 886                 {0, 0},
 887                 {0, 0}
 888                 }
 889         },
 890         {1, 0, 3, 0,            /* 0x75 */
 891                 {{0, 0},
 892                 {2, 2},
 893                 {4, 6},
 894                 {0, 0}
 895                 }
 896         },
 897         {0, 0, 2, 0,            /* 0x76 */
 898                 {{1, 2},
 899                 {4, 6},
 900                 {0, 0},
 901                 {0, 0}
 902                 }
 903         },
 904         {1, 0, 2, 0,            /* 0x77 */
 905                 {{0, 2},
 906                 {4, 6},
 907                 {0, 0},
 908                 {0, 0}
 909                 }
 910         },
 911         {0, 0, 1, 0,            /* 0x78 */
 912                 {{3, 6},
 913                 {0, 0},
 914                 {0, 0},
 915                 {0, 0}
 916                 }
 917         },
 918         {1, 0, 2, 0,            /* 0x79 */
 919                 {{0, 0},
 920                 {3, 6},
 921                 {0, 0},
 922                 {0, 0}
 923                 }
 924         },
 925         {0, 0, 2, 0,            /* 0x7a */
 926                 {{1, 1},
 927                 {3, 6},
 928                 {0, 0},
 929                 {0, 0}
 930                 }
 931         },
 932         {1, 0, 2, 0,            /* 0x7b */
 933                 {{0, 1},
 934                 {3, 6},
 935                 {0, 0},
 936                 {0, 0}
 937                 }
 938         },
 939         {0, 0, 1, 0,            /* 0x7c */
 940                 {{2, 6},
 941                 {0, 0},
 942                 {0, 0},
 943                 {0, 0}
 944                 }
 945         },
 946         {1, 0, 2, 0,            /* 0x7d */
 947                 {{0, 0},
 948                 {2, 6},
 949                 {0, 0},
 950                 {0, 0}
 951                 }
 952         },
 953         {0, 0, 1, 0,            /* 0x7e */
 954                 {{1, 6},
 955                 {0, 0},
 956                 {0, 0},
 957                 {0, 0}
 958                 }
 959         },
 960         {1, 0, 1, 0,            /* 0x7f */
 961                 {{0, 6},
 962                 {0, 0},
 963                 {0, 0},
 964                 {0, 0}
 965                 }
 966         },
 967         {0, 1, 1, 0,            /* 0x80 */
 968                 {{7, 7},
 969                 {0, 0},
 970                 {0, 0},
 971                 {0, 0}
 972                 }
 973         },
 974         {1, 1, 2, 0,            /* 0x81 */
 975                 {{0, 0},
 976                 {7, 7},
 977                 {0, 0},
 978                 {0, 0}
 979                 }
 980         },
 981         {0, 1, 2, 0,            /* 0x82 */
 982                 {{1, 1},
 983                 {7, 7},
 984                 {0, 0},
 985                 {0, 0}
 986                 }
 987         },
 988         {1, 1, 2, 0,            /* 0x83 */
 989                 {{0, 1},
 990                 {7, 7},
 991                 {0, 0},
 992                 {0, 0}
 993                 }
 994         },
 995         {0, 1, 2, 0,            /* 0x84 */
 996                 {{2, 2},
 997                 {7, 7},
 998                 {0, 0},
 999                 {0, 0}
1000                 }
1001         },
1002         {1, 1, 3, 0,            /* 0x85 */
1003                 {{0, 0},
1004                 {2, 2},
1005                 {7, 7},
1006                 {0, 0}
1007                 }
1008         },
1009         {0, 1, 2, 0,            /* 0x86 */
1010                 {{1, 2},
1011                 {7, 7},
1012                 {0, 0},
1013                 {0, 0}
1014                 }
1015         },
1016         {1, 1, 2, 0,            /* 0x87 */
1017                 {{0, 2},
1018                 {7, 7},
1019                 {0, 0},
1020                 {0, 0}
1021                 }
1022         },
1023         {0, 1, 2, 0,            /* 0x88 */
1024                 {{3, 3},
1025                 {7, 7},
1026                 {0, 0},
1027                 {0, 0}
1028                 }
1029         },
1030         {1, 1, 3, 0,            /* 0x89 */
1031                 {{0, 0},
1032                 {3, 3},
1033                 {7, 7},
1034                 {0, 0}
1035                 }
1036         },
1037         {0, 1, 3, 0,            /* 0x8a */
1038                 {{1, 1},
1039                 {3, 3},
1040                 {7, 7},
1041                 {0, 0}
1042                 }
1043         },
1044         {1, 1, 3, 0,            /* 0x8b */
1045                 {{0, 1},
1046                 {3, 3},
1047                 {7, 7},
1048                 {0, 0}
1049                 }
1050         },
1051         {0, 1, 2, 0,            /* 0x8c */
1052                 {{2, 3},
1053                 {7, 7},
1054                 {0, 0},
1055                 {0, 0}
1056                 }
1057         },
1058         {1, 1, 3, 0,            /* 0x8d */
1059                 {{0, 0},
1060                 {2, 3},
1061                 {7, 7},
1062                 {0, 0}
1063                 }
1064         },
1065         {0, 1, 2, 0,            /* 0x8e */
1066                 {{1, 3},
1067                 {7, 7},
1068                 {0, 0},
1069                 {0, 0}
1070                 }
1071         },
1072         {1, 1, 2, 0,            /* 0x8f */
1073                 {{0, 3},
1074                 {7, 7},
1075                 {0, 0},
1076                 {0, 0}
1077                 }
1078         },
1079         {0, 1, 2, 0,            /* 0x90 */
1080                 {{4, 4},
1081                 {7, 7},
1082                 {0, 0},
1083                 {0, 0}
1084                 }
1085         },
1086         {1, 1, 3, 0,            /* 0x91 */
1087                 {{0, 0},
1088                 {4, 4},
1089                 {7, 7},
1090                 {0, 0}
1091                 }
1092         },
1093         {0, 1, 3, 0,            /* 0x92 */
1094                 {{1, 1},
1095                 {4, 4},
1096                 {7, 7},
1097                 {0, 0}
1098                 }
1099         },
1100         {1, 1, 3, 0,            /* 0x93 */
1101                 {{0, 1},
1102                 {4, 4},
1103                 {7, 7},
1104                 {0, 0}
1105                 }
1106         },
1107         {0, 1, 3, 0,            /* 0x94 */
1108                 {{2, 2},
1109                 {4, 4},
1110                 {7, 7},
1111                 {0, 0}
1112                 }
1113         },
1114         {1, 1, 4, 0,            /* 0x95 */
1115                 {{0, 0},
1116                 {2, 2},
1117                 {4, 4},
1118                 {7, 7}
1119                 }
1120         },
1121         {0, 1, 3, 0,            /* 0x96 */
1122                 {{1, 2},
1123                 {4, 4},
1124                 {7, 7},
1125                 {0, 0}
1126                 }
1127         },
1128         {1, 1, 3, 0,            /* 0x97 */
1129                 {{0, 2},
1130                 {4, 4},
1131                 {7, 7},
1132                 {0, 0}
1133                 }
1134         },
1135         {0, 1, 2, 0,            /* 0x98 */
1136                 {{3, 4},
1137                 {7, 7},
1138                 {0, 0},
1139                 {0, 0}
1140                 }
1141         },
1142         {1, 1, 3, 0,            /* 0x99 */
1143                 {{0, 0},
1144                 {3, 4},
1145                 {7, 7},
1146                 {0, 0}
1147                 }
1148         },
1149         {0, 1, 3, 0,            /* 0x9a */
1150                 {{1, 1},
1151                 {3, 4},
1152                 {7, 7},
1153                 {0, 0}
1154                 }
1155         },
1156         {1, 1, 3, 0,            /* 0x9b */
1157                 {{0, 1},
1158                 {3, 4},
1159                 {7, 7},
1160                 {0, 0}
1161                 }
1162         },
1163         {0, 1, 2, 0,            /* 0x9c */
1164                 {{2, 4},
1165                 {7, 7},
1166                 {0, 0},
1167                 {0, 0}
1168                 }
1169         },
1170         {1, 1, 3, 0,            /* 0x9d */
1171                 {{0, 0},
1172                 {2, 4},
1173                 {7, 7},
1174                 {0, 0}
1175                 }
1176         },
1177         {0, 1, 2, 0,            /* 0x9e */
1178                 {{1, 4},
1179                 {7, 7},
1180                 {0, 0},
1181                 {0, 0}
1182                 }
1183         },
1184         {1, 1, 2, 0,            /* 0x9f */
1185                 {{0, 4},
1186                 {7, 7},
1187                 {0, 0},
1188                 {0, 0}
1189                 }
1190         },
1191         {0, 1, 2, 0,            /* 0xa0 */
1192                 {{5, 5},
1193                 {7, 7},
1194                 {0, 0},
1195                 {0, 0}
1196                 }
1197         },
1198         {1, 1, 3, 0,            /* 0xa1 */
1199                 {{0, 0},
1200                 {5, 5},
1201                 {7, 7},
1202                 {0, 0}
1203                 }
1204         },
1205         {0, 1, 3, 0,            /* 0xa2 */
1206                 {{1, 1},
1207                 {5, 5},
1208                 {7, 7},
1209                 {0, 0}
1210                 }
1211         },
1212         {1, 1, 3, 0,            /* 0xa3 */
1213                 {{0, 1},
1214                 {5, 5},
1215                 {7, 7},
1216                 {0, 0}
1217                 }
1218         },
1219         {0, 1, 3, 0,            /* 0xa4 */
1220                 {{2, 2},
1221                 {5, 5},
1222                 {7, 7},
1223                 {0, 0}
1224                 }
1225         },
1226         {1, 1, 4, 0,            /* 0xa5 */
1227                 {{0, 0},
1228                 {2, 2},
1229                 {5, 5},
1230                 {7, 7}
1231                 }
1232         },
1233         {0, 1, 3, 0,            /* 0xa6 */
1234                 {{1, 2},
1235                 {5, 5},
1236                 {7, 7},
1237                 {0, 0}
1238                 }
1239         },
1240         {1, 1, 3, 0,            /* 0xa7 */
1241                 {{0, 2},
1242                 {5, 5},
1243                 {7, 7},
1244                 {0, 0}
1245                 }
1246         },
1247         {0, 1, 3, 0,            /* 0xa8 */
1248                 {{3, 3},
1249                 {5, 5},
1250                 {7, 7},
1251                 {0, 0}
1252                 }
1253         },
1254         {1, 1, 4, 0,            /* 0xa9 */
1255                 {{0, 0},
1256                 {3, 3},
1257                 {5, 5},
1258                 {7, 7}
1259                 }
1260         },
1261         {0, 1, 4, 0,            /* 0xaa */
1262                 {{1, 1},
1263                 {3, 3},
1264                 {5, 5},
1265                 {7, 7}
1266                 }
1267         },
1268         {1, 1, 4, 0,            /* 0xab */
1269                 {{0, 1},
1270                 {3, 3},
1271                 {5, 5},
1272                 {7, 7}
1273                 }
1274         },
1275         {0, 1, 3, 0,            /* 0xac */
1276                 {{2, 3},
1277                 {5, 5},
1278                 {7, 7},
1279                 {0, 0}
1280                 }
1281         },
1282         {1, 1, 4, 0,            /* 0xad */
1283                 {{0, 0},
1284                 {2, 3},
1285                 {5, 5},
1286                 {7, 7}
1287                 }
1288         },
1289         {0, 1, 3, 0,            /* 0xae */
1290                 {{1, 3},
1291                 {5, 5},
1292                 {7, 7},
1293                 {0, 0}
1294                 }
1295         },
1296         {1, 1, 3, 0,            /* 0xaf */
1297                 {{0, 3},
1298                 {5, 5},
1299                 {7, 7},
1300                 {0, 0}
1301                 }
1302         },
1303         {0, 1, 2, 0,            /* 0xb0 */
1304                 {{4, 5},
1305                 {7, 7},
1306                 {0, 0},
1307                 {0, 0}
1308                 }
1309         },
1310         {1, 1, 3, 0,            /* 0xb1 */
1311                 {{0, 0},
1312                 {4, 5},
1313                 {7, 7},
1314                 {0, 0}
1315                 }
1316         },
1317         {0, 1, 3, 0,            /* 0xb2 */
1318                 {{1, 1},
1319                 {4, 5},
1320                 {7, 7},
1321                 {0, 0}
1322                 }
1323         },
1324         {1, 1, 3, 0,            /* 0xb3 */
1325                 {{0, 1},
1326                 {4, 5},
1327                 {7, 7},
1328                 {0, 0}
1329                 }
1330         },
1331         {0, 1, 3, 0,            /* 0xb4 */
1332                 {{2, 2},
1333                 {4, 5},
1334                 {7, 7},
1335                 {0, 0}
1336                 }
1337         },
1338         {1, 1, 4, 0,            /* 0xb5 */
1339                 {{0, 0},
1340                 {2, 2},
1341                 {4, 5},
1342                 {7, 7}
1343                 }
1344         },
1345         {0, 1, 3, 0,            /* 0xb6 */
1346                 {{1, 2},
1347                 {4, 5},
1348                 {7, 7},
1349                 {0, 0}
1350                 }
1351         },
1352         {1, 1, 3, 0,            /* 0xb7 */
1353                 {{0, 2},
1354                 {4, 5},
1355                 {7, 7},
1356                 {0, 0}
1357                 }
1358         },
1359         {0, 1, 2, 0,            /* 0xb8 */
1360                 {{3, 5},
1361                 {7, 7},
1362                 {0, 0},
1363                 {0, 0}
1364                 }
1365         },
1366         {1, 1, 3, 0,            /* 0xb9 */
1367                 {{0, 0},
1368                 {3, 5},
1369                 {7, 7},
1370                 {0, 0}
1371                 }
1372         },
1373         {0, 1, 3, 0,            /* 0xba */
1374                 {{1, 1},
1375                 {3, 5},
1376                 {7, 7},
1377                 {0, 0}
1378                 }
1379         },
1380         {1, 1, 3, 0,            /* 0xbb */
1381                 {{0, 1},
1382                 {3, 5},
1383                 {7, 7},
1384                 {0, 0}
1385                 }
1386         },
1387         {0, 1, 2, 0,            /* 0xbc */
1388                 {{2, 5},
1389                 {7, 7},
1390                 {0, 0},
1391                 {0, 0}
1392                 }
1393         },
1394         {1, 1, 3, 0,            /* 0xbd */
1395                 {{0, 0},
1396                 {2, 5},
1397                 {7, 7},
1398                 {0, 0}
1399                 }
1400         },
1401         {0, 1, 2, 0,            /* 0xbe */
1402                 {{1, 5},
1403                 {7, 7},
1404                 {0, 0},
1405                 {0, 0}
1406                 }
1407         },
1408         {1, 1, 2, 0,            /* 0xbf */
1409                 {{0, 5},
1410                 {7, 7},
1411                 {0, 0},
1412                 {0, 0}
1413                 }
1414         },
1415         {0, 1, 1, 0,            /* 0xc0 */
1416                 {{6, 7},
1417                 {0, 0},
1418                 {0, 0},
1419                 {0, 0}
1420                 }
1421         },
1422         {1, 1, 2, 0,            /* 0xc1 */
1423                 {{0, 0},
1424                 {6, 7},
1425                 {0, 0},
1426                 {0, 0}
1427                 }
1428         },
1429         {0, 1, 2, 0,            /* 0xc2 */
1430                 {{1, 1},
1431                 {6, 7},
1432                 {0, 0},
1433                 {0, 0}
1434                 }
1435         },
1436         {1, 1, 2, 0,            /* 0xc3 */
1437                 {{0, 1},
1438                 {6, 7},
1439                 {0, 0},
1440                 {0, 0}
1441                 }
1442         },
1443         {0, 1, 2, 0,            /* 0xc4 */
1444                 {{2, 2},
1445                 {6, 7},
1446                 {0, 0},
1447                 {0, 0}
1448                 }
1449         },
1450         {1, 1, 3, 0,            /* 0xc5 */
1451                 {{0, 0},
1452                 {2, 2},
1453                 {6, 7},
1454                 {0, 0}
1455                 }
1456         },
1457         {0, 1, 2, 0,            /* 0xc6 */
1458                 {{1, 2},
1459                 {6, 7},
1460                 {0, 0},
1461                 {0, 0}
1462                 }
1463         },
1464         {1, 1, 2, 0,            /* 0xc7 */
1465                 {{0, 2},
1466                 {6, 7},
1467                 {0, 0},
1468                 {0, 0}
1469                 }
1470         },
1471         {0, 1, 2, 0,            /* 0xc8 */
1472                 {{3, 3},
1473                 {6, 7},
1474                 {0, 0},
1475                 {0, 0}
1476                 }
1477         },
1478         {1, 1, 3, 0,            /* 0xc9 */
1479                 {{0, 0},
1480                 {3, 3},
1481                 {6, 7},
1482                 {0, 0}
1483                 }
1484         },
1485         {0, 1, 3, 0,            /* 0xca */
1486                 {{1, 1},
1487                 {3, 3},
1488                 {6, 7},
1489                 {0, 0}
1490                 }
1491         },
1492         {1, 1, 3, 0,            /* 0xcb */
1493                 {{0, 1},
1494                 {3, 3},
1495                 {6, 7},
1496                 {0, 0}
1497                 }
1498         },
1499         {0, 1, 2, 0,            /* 0xcc */
1500                 {{2, 3},
1501                 {6, 7},
1502                 {0, 0},
1503                 {0, 0}
1504                 }
1505         },
1506         {1, 1, 3, 0,            /* 0xcd */
1507                 {{0, 0},
1508                 {2, 3},
1509                 {6, 7},
1510                 {0, 0}
1511                 }
1512         },
1513         {0, 1, 2, 0,            /* 0xce */
1514                 {{1, 3},
1515                 {6, 7},
1516                 {0, 0},
1517                 {0, 0}
1518                 }
1519         },
1520         {1, 1, 2, 0,            /* 0xcf */
1521                 {{0, 3},
1522                 {6, 7},
1523                 {0, 0},
1524                 {0, 0}
1525                 }
1526         },
1527         {0, 1, 2, 0,            /* 0xd0 */
1528                 {{4, 4},
1529                 {6, 7},
1530                 {0, 0},
1531                 {0, 0}
1532                 }
1533         },
1534         {1, 1, 3, 0,            /* 0xd1 */
1535                 {{0, 0},
1536                 {4, 4},
1537                 {6, 7},
1538                 {0, 0}
1539                 }
1540         },
1541         {0, 1, 3, 0,            /* 0xd2 */
1542                 {{1, 1},
1543                 {4, 4},
1544                 {6, 7},
1545                 {0, 0}
1546                 }
1547         },
1548         {1, 1, 3, 0,            /* 0xd3 */
1549                 {{0, 1},
1550                 {4, 4},
1551                 {6, 7},
1552                 {0, 0}
1553                 }
1554         },
1555         {0, 1, 3, 0,            /* 0xd4 */
1556                 {{2, 2},
1557                 {4, 4},
1558                 {6, 7},
1559                 {0, 0}
1560                 }
1561         },
1562         {1, 1, 4, 0,            /* 0xd5 */
1563                 {{0, 0},
1564                 {2, 2},
1565                 {4, 4},
1566                 {6, 7}
1567                 }
1568         },
1569         {0, 1, 3, 0,            /* 0xd6 */
1570                 {{1, 2},
1571                 {4, 4},
1572                 {6, 7},
1573                 {0, 0}
1574                 }
1575         },
1576         {1, 1, 3, 0,            /* 0xd7 */
1577                 {{0, 2},
1578                 {4, 4},
1579                 {6, 7},
1580                 {0, 0}
1581                 }
1582         },
1583         {0, 1, 2, 0,            /* 0xd8 */
1584                 {{3, 4},
1585                 {6, 7},
1586                 {0, 0},
1587                 {0, 0}
1588                 }
1589         },
1590         {1, 1, 3, 0,            /* 0xd9 */
1591                 {{0, 0},
1592                 {3, 4},
1593                 {6, 7},
1594                 {0, 0}
1595                 }
1596         },
1597         {0, 1, 3, 0,            /* 0xda */
1598                 {{1, 1},
1599                 {3, 4},
1600                 {6, 7},
1601                 {0, 0}
1602                 }
1603         },
1604         {1, 1, 3, 0,            /* 0xdb */
1605                 {{0, 1},
1606                 {3, 4},
1607                 {6, 7},
1608                 {0, 0}
1609                 }
1610         },
1611         {0, 1, 2, 0,            /* 0xdc */
1612                 {{2, 4},
1613                 {6, 7},
1614                 {0, 0},
1615                 {0, 0}
1616                 }
1617         },
1618         {1, 1, 3, 0,            /* 0xdd */
1619                 {{0, 0},
1620                 {2, 4},
1621                 {6, 7},
1622                 {0, 0}
1623                 }
1624         },
1625         {0, 1, 2, 0,            /* 0xde */
1626                 {{1, 4},
1627                 {6, 7},
1628                 {0, 0},
1629                 {0, 0}
1630                 }
1631         },
1632         {1, 1, 2, 0,            /* 0xdf */
1633                 {{0, 4},
1634                 {6, 7},
1635                 {0, 0},
1636                 {0, 0}
1637                 }
1638         },
1639         {0, 1, 1, 0,            /* 0xe0 */
1640                 {{5, 7},
1641                 {0, 0},
1642                 {0, 0},
1643                 {0, 0}
1644                 }
1645         },
1646         {1, 1, 2, 0,            /* 0xe1 */
1647                 {{0, 0},
1648                 {5, 7},
1649                 {0, 0},
1650                 {0, 0}
1651                 }
1652         },
1653         {0, 1, 2, 0,            /* 0xe2 */
1654                 {{1, 1},
1655                 {5, 7},
1656                 {0, 0},
1657                 {0, 0}
1658                 }
1659         },
1660         {1, 1, 2, 0,            /* 0xe3 */
1661                 {{0, 1},
1662                 {5, 7},
1663                 {0, 0},
1664                 {0, 0}
1665                 }
1666         },
1667         {0, 1, 2, 0,            /* 0xe4 */
1668                 {{2, 2},
1669                 {5, 7},
1670                 {0, 0},
1671                 {0, 0}
1672                 }
1673         },
1674         {1, 1, 3, 0,            /* 0xe5 */
1675                 {{0, 0},
1676                 {2, 2},
1677                 {5, 7},
1678                 {0, 0}
1679                 }
1680         },
1681         {0, 1, 2, 0,            /* 0xe6 */
1682                 {{1, 2},
1683                 {5, 7},
1684                 {0, 0},
1685                 {0, 0}
1686                 }
1687         },
1688         {1, 1, 2, 0,            /* 0xe7 */
1689                 {{0, 2},
1690                 {5, 7},
1691                 {0, 0},
1692                 {0, 0}
1693                 }
1694         },
1695         {0, 1, 2, 0,            /* 0xe8 */
1696                 {{3, 3},
1697                 {5, 7},
1698                 {0, 0},
1699                 {0, 0}
1700                 }
1701         },
1702         {1, 1, 3, 0,            /* 0xe9 */
1703                 {{0, 0},
1704                 {3, 3},
1705                 {5, 7},
1706                 {0, 0}
1707                 }
1708         },
1709         {0, 1, 3, 0,            /* 0xea */
1710                 {{1, 1},
1711                 {3, 3},
1712                 {5, 7},
1713                 {0, 0}
1714                 }
1715         },
1716         {1, 1, 3, 0,            /* 0xeb */
1717                 {{0, 1},
1718                 {3, 3},
1719                 {5, 7},
1720                 {0, 0}
1721                 }
1722         },
1723         {0, 1, 2, 0,            /* 0xec */
1724                 {{2, 3},
1725                 {5, 7},
1726                 {0, 0},
1727                 {0, 0}
1728                 }
1729         },
1730         {1, 1, 3, 0,            /* 0xed */
1731                 {{0, 0},
1732                 {2, 3},
1733                 {5, 7},
1734                 {0, 0}
1735                 }
1736         },
1737         {0, 1, 2, 0,            /* 0xee */
1738                 {{1, 3},
1739                 {5, 7},
1740                 {0, 0},
1741                 {0, 0}
1742                 }
1743         },
1744         {1, 1, 2, 0,            /* 0xef */
1745                 {{0, 3},
1746                 {5, 7},
1747                 {0, 0},
1748                 {0, 0}
1749                 }
1750         },
1751         {0, 1, 1, 0,            /* 0xf0 */
1752                 {{4, 7},
1753                 {0, 0},
1754                 {0, 0},
1755                 {0, 0}
1756                 }
1757         },
1758         {1, 1, 2, 0,            /* 0xf1 */
1759                 {{0, 0},
1760                 {4, 7},
1761                 {0, 0},
1762                 {0, 0}
1763                 }
1764         },
1765         {0, 1, 2, 0,            /* 0xf2 */
1766                 {{1, 1},
1767                 {4, 7},
1768                 {0, 0},
1769                 {0, 0}
1770                 }
1771         },
1772         {1, 1, 2, 0,            /* 0xf3 */
1773                 {{0, 1},
1774                 {4, 7},
1775                 {0, 0},
1776                 {0, 0}
1777                 }
1778         },
1779         {0, 1, 2, 0,            /* 0xf4 */
1780                 {{2, 2},
1781                 {4, 7},
1782                 {0, 0},
1783                 {0, 0}
1784                 }
1785         },
1786         {1, 1, 3, 0,            /* 0xf5 */
1787                 {{0, 0},
1788                 {2, 2},
1789                 {4, 7},
1790                 {0, 0}
1791                 }
1792         },
1793         {0, 1, 2, 0,            /* 0xf6 */
1794                 {{1, 2},
1795                 {4, 7},
1796                 {0, 0},
1797                 {0, 0}
1798                 }
1799         },
1800         {1, 1, 2, 0,            /* 0xf7 */
1801                 {{0, 2},
1802                 {4, 7},
1803                 {0, 0},
1804                 {0, 0}
1805                 }
1806         },
1807         {0, 1, 1, 0,            /* 0xf8 */
1808                 {{3, 7},
1809                 {0, 0},
1810                 {0, 0},
1811                 {0, 0}
1812                 }
1813         },
1814         {1, 1, 2, 0,            /* 0xf9 */
1815                 {{0, 0},
1816                 {3, 7},
1817                 {0, 0},
1818                 {0, 0}
1819                 }
1820         },
1821         {0, 1, 2, 0,            /* 0xfa */
1822                 {{1, 1},
1823                 {3, 7},
1824                 {0, 0},
1825                 {0, 0}
1826                 }
1827         },
1828         {1, 1, 2, 0,            /* 0xfb */
1829                 {{0, 1},
1830                 {3, 7},
1831                 {0, 0},
1832                 {0, 0}
1833                 }
1834         },
1835         {0, 1, 1, 0,            /* 0xfc */
1836                 {{2, 7},
1837                 {0, 0},
1838                 {0, 0},
1839                 {0, 0}
1840                 }
1841         },
1842         {1, 1, 2, 0,            /* 0xfd */
1843                 {{0, 0},
1844                 {2, 7},
1845                 {0, 0},
1846                 {0, 0}
1847                 }
1848         },
1849         {0, 1, 1, 0,            /* 0xfe */
1850                 {{1, 7},
1851                 {0, 0},
1852                 {0, 0},
1853                 {0, 0}
1854                 }
1855         },
1856         {1, 1, 1, 0,            /* 0xff */
1857                 {{0, 7},
1858                 {0, 0},
1859                 {0, 0},
1860                 {0, 0}
1861                 }
1862         }
1863 };
1864
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *paramh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946 #endif
1947
1948         switch (ifa->address.sa.sa_family) {
1949 #ifdef INET
1950         case AF_INET:
1951                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952                 break;
1953 #endif
1954 #ifdef INET6
1955         case AF_INET6:
1956                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957                 break;
1958 #endif
1959         default:
1960                 return (m);
1961         }
1962 #if defined(INET) || defined(INET6)
1963         if (M_TRAILINGSPACE(m) >= plen) {
1964                 /* easy side we just drop it on the end */
1965                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 paramh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = &ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1991                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         paramh->param_length = htons(plen);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += plen;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = &ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2006                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         paramh->param_length = htons(plen);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += plen;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         if (len != NULL) {
2020                 *len += plen;
2021         }
2022         return (mret);
2023 #endif
2024 }
2025
2026
2027 struct mbuf *
2028 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2029     struct sctp_scoping *scope,
2030     struct mbuf *m_at, int cnt_inits_to,
2031     uint16_t *padding_len, uint16_t *chunk_len)
2032 {
2033         struct sctp_vrf *vrf = NULL;
2034         int cnt, limit_out = 0, total_count;
2035         uint32_t vrf_id;
2036
2037         vrf_id = inp->def_vrf_id;
2038         SCTP_IPI_ADDR_RLOCK();
2039         vrf = sctp_find_vrf(vrf_id);
2040         if (vrf == NULL) {
2041                 SCTP_IPI_ADDR_RUNLOCK();
2042                 return (m_at);
2043         }
2044         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2045                 struct sctp_ifa *sctp_ifap;
2046                 struct sctp_ifn *sctp_ifnp;
2047
2048                 cnt = cnt_inits_to;
2049                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2050                         limit_out = 1;
2051                         cnt = SCTP_ADDRESS_LIMIT;
2052                         goto skip_count;
2053                 }
2054                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2055                         if ((scope->loopback_scope == 0) &&
2056                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2057                                 /*
2058                                  * Skip loopback devices if loopback_scope
2059                                  * not set
2060                                  */
2061                                 continue;
2062                         }
2063                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2064 #ifdef INET
2065                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2066                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2067                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2068                                         continue;
2069                                 }
2070 #endif
2071 #ifdef INET6
2072                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2073                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2074                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2075                                         continue;
2076                                 }
2077 #endif
2078                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2079                                         continue;
2080                                 }
2081                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2082                                         continue;
2083                                 }
2084                                 cnt++;
2085                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2086                                         break;
2087                                 }
2088                         }
2089                         if (cnt > SCTP_ADDRESS_LIMIT) {
2090                                 break;
2091                         }
2092                 }
2093 skip_count:
2094                 if (cnt > 1) {
2095                         total_count = 0;
2096                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2097                                 cnt = 0;
2098                                 if ((scope->loopback_scope == 0) &&
2099                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2100                                         /*
2101                                          * Skip loopback devices if
2102                                          * loopback_scope not set
2103                                          */
2104                                         continue;
2105                                 }
2106                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2107 #ifdef INET
2108                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2109                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2110                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2111                                                 continue;
2112                                         }
2113 #endif
2114 #ifdef INET6
2115                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2116                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2117                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2118                                                 continue;
2119                                         }
2120 #endif
2121                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2122                                                 continue;
2123                                         }
2124                                         if (sctp_is_address_in_scope(sctp_ifap,
2125                                             scope, 0) == 0) {
2126                                                 continue;
2127                                         }
2128                                         if ((chunk_len != NULL) &&
2129                                             (padding_len != NULL) &&
2130                                             (*padding_len > 0)) {
2131                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2132                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2133                                                 *chunk_len += *padding_len;
2134                                                 *padding_len = 0;
2135                                         }
2136                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2137                                         if (limit_out) {
2138                                                 cnt++;
2139                                                 total_count++;
2140                                                 if (cnt >= 2) {
2141                                                         /*
2142                                                          * two from each
2143                                                          * address
2144                                                          */
2145                                                         break;
2146                                                 }
2147                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2148                                                         /* No more addresses */
2149                                                         break;
2150                                                 }
2151                                         }
2152                                 }
2153                         }
2154                 }
2155         } else {
2156                 struct sctp_laddr *laddr;
2157
2158                 cnt = cnt_inits_to;
2159                 /* First, how many ? */
2160                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2161                         if (laddr->ifa == NULL) {
2162                                 continue;
2163                         }
2164                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2165                                 /*
2166                                  * Address being deleted by the system, dont
2167                                  * list.
2168                                  */
2169                                 continue;
2170                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2171                                 /*
2172                                  * Address being deleted on this ep don't
2173                                  * list.
2174                                  */
2175                                 continue;
2176                         }
2177                         if (sctp_is_address_in_scope(laddr->ifa,
2178                             scope, 1) == 0) {
2179                                 continue;
2180                         }
2181                         cnt++;
2182                 }
2183                 /*
2184                  * To get through a NAT we only list addresses if we have
2185                  * more than one. That way if you just bind a single address
2186                  * we let the source of the init dictate our address.
2187                  */
2188                 if (cnt > 1) {
2189                         cnt = cnt_inits_to;
2190                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2191                                 if (laddr->ifa == NULL) {
2192                                         continue;
2193                                 }
2194                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2195                                         continue;
2196                                 }
2197                                 if (sctp_is_address_in_scope(laddr->ifa,
2198                                     scope, 0) == 0) {
2199                                         continue;
2200                                 }
2201                                 if ((chunk_len != NULL) &&
2202                                     (padding_len != NULL) &&
2203                                     (*padding_len > 0)) {
2204                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2205                                         SCTP_BUF_LEN(m_at) += *padding_len;
2206                                         *chunk_len += *padding_len;
2207                                         *padding_len = 0;
2208                                 }
2209                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2210                                 cnt++;
2211                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2212                                         break;
2213                                 }
2214                         }
2215                 }
2216         }
2217         SCTP_IPI_ADDR_RUNLOCK();
2218         return (m_at);
2219 }
2220
2221 static struct sctp_ifa *
2222 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2223     uint8_t dest_is_loop,
2224     uint8_t dest_is_priv,
2225     sa_family_t fam)
2226 {
2227         uint8_t dest_is_global = 0;
2228
2229         /* dest_is_priv is true if destination is a private address */
2230         /* dest_is_loop is true if destination is a loopback addresses */
2231
2232         /**
2233          * Here we determine if its a preferred address. A preferred address
2234          * means it is the same scope or higher scope then the destination.
2235          * L = loopback, P = private, G = global
2236          * -----------------------------------------
2237          *    src    |  dest | result
2238          *  ----------------------------------------
2239          *     L     |    L  |    yes
2240          *  -----------------------------------------
2241          *     P     |    L  |    yes-v4 no-v6
2242          *  -----------------------------------------
2243          *     G     |    L  |    yes-v4 no-v6
2244          *  -----------------------------------------
2245          *     L     |    P  |    no
2246          *  -----------------------------------------
2247          *     P     |    P  |    yes
2248          *  -----------------------------------------
2249          *     G     |    P  |    no
2250          *   -----------------------------------------
2251          *     L     |    G  |    no
2252          *   -----------------------------------------
2253          *     P     |    G  |    no
2254          *    -----------------------------------------
2255          *     G     |    G  |    yes
2256          *    -----------------------------------------
2257          */
2258
2259         if (ifa->address.sa.sa_family != fam) {
2260                 /* forget mis-matched family */
2261                 return (NULL);
2262         }
2263         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2264                 dest_is_global = 1;
2265         }
2266         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2267         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2268         /* Ok the address may be ok */
2269 #ifdef INET6
2270         if (fam == AF_INET6) {
2271                 /* ok to use deprecated addresses? no lets not! */
2272                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2273                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2274                         return (NULL);
2275                 }
2276                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2277                         if (dest_is_loop) {
2278                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2279                                 return (NULL);
2280                         }
2281                 }
2282                 if (ifa->src_is_glob) {
2283                         if (dest_is_loop) {
2284                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2285                                 return (NULL);
2286                         }
2287                 }
2288         }
2289 #endif
2290         /*
2291          * Now that we know what is what, implement or table this could in
2292          * theory be done slicker (it used to be), but this is
2293          * straightforward and easier to validate :-)
2294          */
2295         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2296             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2297         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2298             dest_is_loop, dest_is_priv, dest_is_global);
2299
2300         if ((ifa->src_is_loop) && (dest_is_priv)) {
2301                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2302                 return (NULL);
2303         }
2304         if ((ifa->src_is_glob) && (dest_is_priv)) {
2305                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2306                 return (NULL);
2307         }
2308         if ((ifa->src_is_loop) && (dest_is_global)) {
2309                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2310                 return (NULL);
2311         }
2312         if ((ifa->src_is_priv) && (dest_is_global)) {
2313                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2314                 return (NULL);
2315         }
2316         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2317         /* its a preferred address */
2318         return (ifa);
2319 }
2320
2321 static struct sctp_ifa *
2322 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2323     uint8_t dest_is_loop,
2324     uint8_t dest_is_priv,
2325     sa_family_t fam)
2326 {
2327         uint8_t dest_is_global = 0;
2328
2329         /**
2330          * Here we determine if its a acceptable address. A acceptable
2331          * address means it is the same scope or higher scope but we can
2332          * allow for NAT which means its ok to have a global dest and a
2333          * private src.
2334          *
2335          * L = loopback, P = private, G = global
2336          * -----------------------------------------
2337          *  src    |  dest | result
2338          * -----------------------------------------
2339          *   L     |   L   |    yes
2340          *  -----------------------------------------
2341          *   P     |   L   |    yes-v4 no-v6
2342          *  -----------------------------------------
2343          *   G     |   L   |    yes
2344          * -----------------------------------------
2345          *   L     |   P   |    no
2346          * -----------------------------------------
2347          *   P     |   P   |    yes
2348          * -----------------------------------------
2349          *   G     |   P   |    yes - May not work
2350          * -----------------------------------------
2351          *   L     |   G   |    no
2352          * -----------------------------------------
2353          *   P     |   G   |    yes - May not work
2354          * -----------------------------------------
2355          *   G     |   G   |    yes
2356          * -----------------------------------------
2357          */
2358
2359         if (ifa->address.sa.sa_family != fam) {
2360                 /* forget non matching family */
2361                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2362                     ifa->address.sa.sa_family, fam);
2363                 return (NULL);
2364         }
2365         /* Ok the address may be ok */
2366         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2367         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2368             dest_is_loop, dest_is_priv);
2369         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2370                 dest_is_global = 1;
2371         }
2372 #ifdef INET6
2373         if (fam == AF_INET6) {
2374                 /* ok to use deprecated addresses? */
2375                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2376                         return (NULL);
2377                 }
2378                 if (ifa->src_is_priv) {
2379                         /* Special case, linklocal to loop */
2380                         if (dest_is_loop)
2381                                 return (NULL);
2382                 }
2383         }
2384 #endif
2385         /*
2386          * Now that we know what is what, implement our table. This could in
2387          * theory be done slicker (it used to be), but this is
2388          * straightforward and easier to validate :-)
2389          */
2390         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2391             ifa->src_is_loop,
2392             dest_is_priv);
2393         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2394                 return (NULL);
2395         }
2396         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2397             ifa->src_is_loop,
2398             dest_is_global);
2399         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2400                 return (NULL);
2401         }
2402         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2403         /* its an acceptable address */
2404         return (ifa);
2405 }
2406
2407 int
2408 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2409 {
2410         struct sctp_laddr *laddr;
2411
2412         if (stcb == NULL) {
2413                 /* There are no restrictions, no TCB :-) */
2414                 return (0);
2415         }
2416         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2417                 if (laddr->ifa == NULL) {
2418                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2419                             __func__);
2420                         continue;
2421                 }
2422                 if (laddr->ifa == ifa) {
2423                         /* Yes it is on the list */
2424                         return (1);
2425                 }
2426         }
2427         return (0);
2428 }
2429
2430
2431 int
2432 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2433 {
2434         struct sctp_laddr *laddr;
2435
2436         if (ifa == NULL)
2437                 return (0);
2438         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2439                 if (laddr->ifa == NULL) {
2440                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2441                             __func__);
2442                         continue;
2443                 }
2444                 if ((laddr->ifa == ifa) && laddr->action == 0)
2445                         /* same pointer */
2446                         return (1);
2447         }
2448         return (0);
2449 }
2450
2451
2452
2453 static struct sctp_ifa *
2454 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2455     sctp_route_t *ro,
2456     uint32_t vrf_id,
2457     int non_asoc_addr_ok,
2458     uint8_t dest_is_priv,
2459     uint8_t dest_is_loop,
2460     sa_family_t fam)
2461 {
2462         struct sctp_laddr *laddr, *starting_point;
2463         void *ifn;
2464         int resettotop = 0;
2465         struct sctp_ifn *sctp_ifn;
2466         struct sctp_ifa *sctp_ifa, *sifa;
2467         struct sctp_vrf *vrf;
2468         uint32_t ifn_index;
2469
2470         vrf = sctp_find_vrf(vrf_id);
2471         if (vrf == NULL)
2472                 return (NULL);
2473
2474         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2475         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2476         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2477         /*
2478          * first question, is the ifn we will emit on in our list, if so, we
2479          * want such an address. Note that we first looked for a preferred
2480          * address.
2481          */
2482         if (sctp_ifn) {
2483                 /* is a preferred one on the interface we route out? */
2484                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2485 #ifdef INET
2486                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2487                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2488                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2489                                 continue;
2490                         }
2491 #endif
2492 #ifdef INET6
2493                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2494                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2495                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2496                                 continue;
2497                         }
2498 #endif
2499                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2500                             (non_asoc_addr_ok == 0))
2501                                 continue;
2502                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2503                             dest_is_loop,
2504                             dest_is_priv, fam);
2505                         if (sifa == NULL)
2506                                 continue;
2507                         if (sctp_is_addr_in_ep(inp, sifa)) {
2508                                 atomic_add_int(&sifa->refcount, 1);
2509                                 return (sifa);
2510                         }
2511                 }
2512         }
2513         /*
2514          * ok, now we now need to find one on the list of the addresses. We
2515          * can't get one on the emitting interface so let's find first a
2516          * preferred one. If not that an acceptable one otherwise... we
2517          * return NULL.
2518          */
2519         starting_point = inp->next_addr_touse;
2520 once_again:
2521         if (inp->next_addr_touse == NULL) {
2522                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2523                 resettotop = 1;
2524         }
2525         for (laddr = inp->next_addr_touse; laddr;
2526             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2527                 if (laddr->ifa == NULL) {
2528                         /* address has been removed */
2529                         continue;
2530                 }
2531                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2532                         /* address is being deleted */
2533                         continue;
2534                 }
2535                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2536                     dest_is_priv, fam);
2537                 if (sifa == NULL)
2538                         continue;
2539                 atomic_add_int(&sifa->refcount, 1);
2540                 return (sifa);
2541         }
2542         if (resettotop == 0) {
2543                 inp->next_addr_touse = NULL;
2544                 goto once_again;
2545         }
2546         inp->next_addr_touse = starting_point;
2547         resettotop = 0;
2548 once_again_too:
2549         if (inp->next_addr_touse == NULL) {
2550                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2551                 resettotop = 1;
2552         }
2553         /* ok, what about an acceptable address in the inp */
2554         for (laddr = inp->next_addr_touse; laddr;
2555             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2556                 if (laddr->ifa == NULL) {
2557                         /* address has been removed */
2558                         continue;
2559                 }
2560                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2561                         /* address is being deleted */
2562                         continue;
2563                 }
2564                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2565                     dest_is_priv, fam);
2566                 if (sifa == NULL)
2567                         continue;
2568                 atomic_add_int(&sifa->refcount, 1);
2569                 return (sifa);
2570         }
2571         if (resettotop == 0) {
2572                 inp->next_addr_touse = NULL;
2573                 goto once_again_too;
2574         }
2575         /*
2576          * no address bound can be a source for the destination we are in
2577          * trouble
2578          */
2579         return (NULL);
2580 }
2581
2582
2583
2584 static struct sctp_ifa *
2585 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2586     struct sctp_tcb *stcb,
2587     sctp_route_t *ro,
2588     uint32_t vrf_id,
2589     uint8_t dest_is_priv,
2590     uint8_t dest_is_loop,
2591     int non_asoc_addr_ok,
2592     sa_family_t fam)
2593 {
2594         struct sctp_laddr *laddr, *starting_point;
2595         void *ifn;
2596         struct sctp_ifn *sctp_ifn;
2597         struct sctp_ifa *sctp_ifa, *sifa;
2598         uint8_t start_at_beginning = 0;
2599         struct sctp_vrf *vrf;
2600         uint32_t ifn_index;
2601
2602         /*
2603          * first question, is the ifn we will emit on in our list, if so, we
2604          * want that one.
2605          */
2606         vrf = sctp_find_vrf(vrf_id);
2607         if (vrf == NULL)
2608                 return (NULL);
2609
2610         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2611         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2612         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2613
2614         /*
2615          * first question, is the ifn we will emit on in our list?  If so,
2616          * we want that one. First we look for a preferred. Second, we go
2617          * for an acceptable.
2618          */
2619         if (sctp_ifn) {
2620                 /* first try for a preferred address on the ep */
2621                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2622 #ifdef INET
2623                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2624                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2625                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2626                                 continue;
2627                         }
2628 #endif
2629 #ifdef INET6
2630                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2631                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2632                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2633                                 continue;
2634                         }
2635 #endif
2636                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2637                                 continue;
2638                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2639                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2640                                 if (sifa == NULL)
2641                                         continue;
2642                                 if (((non_asoc_addr_ok == 0) &&
2643                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2644                                     (non_asoc_addr_ok &&
2645                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2646                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2647                                         /* on the no-no list */
2648                                         continue;
2649                                 }
2650                                 atomic_add_int(&sifa->refcount, 1);
2651                                 return (sifa);
2652                         }
2653                 }
2654                 /* next try for an acceptable address on the ep */
2655                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2656 #ifdef INET
2657                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2658                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2659                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2660                                 continue;
2661                         }
2662 #endif
2663 #ifdef INET6
2664                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2665                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2666                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2667                                 continue;
2668                         }
2669 #endif
2670                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2671                                 continue;
2672                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2673                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2674                                 if (sifa == NULL)
2675                                         continue;
2676                                 if (((non_asoc_addr_ok == 0) &&
2677                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2678                                     (non_asoc_addr_ok &&
2679                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2680                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2681                                         /* on the no-no list */
2682                                         continue;
2683                                 }
2684                                 atomic_add_int(&sifa->refcount, 1);
2685                                 return (sifa);
2686                         }
2687                 }
2688
2689         }
2690         /*
2691          * if we can't find one like that then we must look at all addresses
2692          * bound to pick one at first preferable then secondly acceptable.
2693          */
2694         starting_point = stcb->asoc.last_used_address;
2695 sctp_from_the_top:
2696         if (stcb->asoc.last_used_address == NULL) {
2697                 start_at_beginning = 1;
2698                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2699         }
2700         /* search beginning with the last used address */
2701         for (laddr = stcb->asoc.last_used_address; laddr;
2702             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2703                 if (laddr->ifa == NULL) {
2704                         /* address has been removed */
2705                         continue;
2706                 }
2707                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2708                         /* address is being deleted */
2709                         continue;
2710                 }
2711                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2712                 if (sifa == NULL)
2713                         continue;
2714                 if (((non_asoc_addr_ok == 0) &&
2715                     (sctp_is_addr_restricted(stcb, sifa))) ||
2716                     (non_asoc_addr_ok &&
2717                     (sctp_is_addr_restricted(stcb, sifa)) &&
2718                     (!sctp_is_addr_pending(stcb, sifa)))) {
2719                         /* on the no-no list */
2720                         continue;
2721                 }
2722                 stcb->asoc.last_used_address = laddr;
2723                 atomic_add_int(&sifa->refcount, 1);
2724                 return (sifa);
2725         }
2726         if (start_at_beginning == 0) {
2727                 stcb->asoc.last_used_address = NULL;
2728                 goto sctp_from_the_top;
2729         }
2730         /* now try for any higher scope than the destination */
2731         stcb->asoc.last_used_address = starting_point;
2732         start_at_beginning = 0;
2733 sctp_from_the_top2:
2734         if (stcb->asoc.last_used_address == NULL) {
2735                 start_at_beginning = 1;
2736                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2737         }
2738         /* search beginning with the last used address */
2739         for (laddr = stcb->asoc.last_used_address; laddr;
2740             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2741                 if (laddr->ifa == NULL) {
2742                         /* address has been removed */
2743                         continue;
2744                 }
2745                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2746                         /* address is being deleted */
2747                         continue;
2748                 }
2749                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2750                     dest_is_priv, fam);
2751                 if (sifa == NULL)
2752                         continue;
2753                 if (((non_asoc_addr_ok == 0) &&
2754                     (sctp_is_addr_restricted(stcb, sifa))) ||
2755                     (non_asoc_addr_ok &&
2756                     (sctp_is_addr_restricted(stcb, sifa)) &&
2757                     (!sctp_is_addr_pending(stcb, sifa)))) {
2758                         /* on the no-no list */
2759                         continue;
2760                 }
2761                 stcb->asoc.last_used_address = laddr;
2762                 atomic_add_int(&sifa->refcount, 1);
2763                 return (sifa);
2764         }
2765         if (start_at_beginning == 0) {
2766                 stcb->asoc.last_used_address = NULL;
2767                 goto sctp_from_the_top2;
2768         }
2769         return (NULL);
2770 }
2771
2772 static struct sctp_ifa *
2773 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2774     struct sctp_inpcb *inp,
2775     struct sctp_tcb *stcb,
2776     int non_asoc_addr_ok,
2777     uint8_t dest_is_loop,
2778     uint8_t dest_is_priv,
2779     int addr_wanted,
2780     sa_family_t fam,
2781     sctp_route_t *ro
2782 )
2783 {
2784         struct sctp_ifa *ifa, *sifa;
2785         int num_eligible_addr = 0;
2786 #ifdef INET6
2787         struct sockaddr_in6 sin6, lsa6;
2788
2789         if (fam == AF_INET6) {
2790                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2791                 (void)sa6_recoverscope(&sin6);
2792         }
2793 #endif                          /* INET6 */
2794         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2795 #ifdef INET
2796                 if ((ifa->address.sa.sa_family == AF_INET) &&
2797                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2798                     &ifa->address.sin.sin_addr) != 0)) {
2799                         continue;
2800                 }
2801 #endif
2802 #ifdef INET6
2803                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2804                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2805                     &ifa->address.sin6.sin6_addr) != 0)) {
2806                         continue;
2807                 }
2808 #endif
2809                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2810                     (non_asoc_addr_ok == 0))
2811                         continue;
2812                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2813                     dest_is_priv, fam);
2814                 if (sifa == NULL)
2815                         continue;
2816 #ifdef INET6
2817                 if (fam == AF_INET6 &&
2818                     dest_is_loop &&
2819                     sifa->src_is_loop && sifa->src_is_priv) {
2820                         /*
2821                          * don't allow fe80::1 to be a src on loop ::1, we
2822                          * don't list it to the peer so we will get an
2823                          * abort.
2824                          */
2825                         continue;
2826                 }
2827                 if (fam == AF_INET6 &&
2828                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2829                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2830                         /*
2831                          * link-local <-> link-local must belong to the same
2832                          * scope.
2833                          */
2834                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2835                         (void)sa6_recoverscope(&lsa6);
2836                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2837                                 continue;
2838                         }
2839                 }
2840 #endif                          /* INET6 */
2841
2842                 /*
2843                  * Check if the IPv6 address matches to next-hop. In the
2844                  * mobile case, old IPv6 address may be not deleted from the
2845                  * interface. Then, the interface has previous and new
2846                  * addresses.  We should use one corresponding to the
2847                  * next-hop.  (by micchie)
2848                  */
2849 #ifdef INET6
2850                 if (stcb && fam == AF_INET6 &&
2851                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2852                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2853                             == 0) {
2854                                 continue;
2855                         }
2856                 }
2857 #endif
2858 #ifdef INET
2859                 /* Avoid topologically incorrect IPv4 address */
2860                 if (stcb && fam == AF_INET &&
2861                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2862                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2863                                 continue;
2864                         }
2865                 }
2866 #endif
2867                 if (stcb) {
2868                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2869                                 continue;
2870                         }
2871                         if (((non_asoc_addr_ok == 0) &&
2872                             (sctp_is_addr_restricted(stcb, sifa))) ||
2873                             (non_asoc_addr_ok &&
2874                             (sctp_is_addr_restricted(stcb, sifa)) &&
2875                             (!sctp_is_addr_pending(stcb, sifa)))) {
2876                                 /*
2877                                  * It is restricted for some reason..
2878                                  * probably not yet added.
2879                                  */
2880                                 continue;
2881                         }
2882                 }
2883                 if (num_eligible_addr >= addr_wanted) {
2884                         return (sifa);
2885                 }
2886                 num_eligible_addr++;
2887         }
2888         return (NULL);
2889 }
2890
2891
2892 static int
2893 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2894     struct sctp_inpcb *inp,
2895     struct sctp_tcb *stcb,
2896     int non_asoc_addr_ok,
2897     uint8_t dest_is_loop,
2898     uint8_t dest_is_priv,
2899     sa_family_t fam)
2900 {
2901         struct sctp_ifa *ifa, *sifa;
2902         int num_eligible_addr = 0;
2903
2904         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2905 #ifdef INET
2906                 if ((ifa->address.sa.sa_family == AF_INET) &&
2907                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2908                     &ifa->address.sin.sin_addr) != 0)) {
2909                         continue;
2910                 }
2911 #endif
2912 #ifdef INET6
2913                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2914                     (stcb != NULL) &&
2915                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2916                     &ifa->address.sin6.sin6_addr) != 0)) {
2917                         continue;
2918                 }
2919 #endif
2920                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2921                     (non_asoc_addr_ok == 0)) {
2922                         continue;
2923                 }
2924                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2925                     dest_is_priv, fam);
2926                 if (sifa == NULL) {
2927                         continue;
2928                 }
2929                 if (stcb) {
2930                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2931                                 continue;
2932                         }
2933                         if (((non_asoc_addr_ok == 0) &&
2934                             (sctp_is_addr_restricted(stcb, sifa))) ||
2935                             (non_asoc_addr_ok &&
2936                             (sctp_is_addr_restricted(stcb, sifa)) &&
2937                             (!sctp_is_addr_pending(stcb, sifa)))) {
2938                                 /*
2939                                  * It is restricted for some reason..
2940                                  * probably not yet added.
2941                                  */
2942                                 continue;
2943                         }
2944                 }
2945                 num_eligible_addr++;
2946         }
2947         return (num_eligible_addr);
2948 }
2949
2950 static struct sctp_ifa *
2951 sctp_choose_boundall(struct sctp_inpcb *inp,
2952     struct sctp_tcb *stcb,
2953     struct sctp_nets *net,
2954     sctp_route_t *ro,
2955     uint32_t vrf_id,
2956     uint8_t dest_is_priv,
2957     uint8_t dest_is_loop,
2958     int non_asoc_addr_ok,
2959     sa_family_t fam)
2960 {
2961         int cur_addr_num = 0, num_preferred = 0;
2962         void *ifn;
2963         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2964         struct sctp_ifa *sctp_ifa, *sifa;
2965         uint32_t ifn_index;
2966         struct sctp_vrf *vrf;
2967 #ifdef INET
2968         int retried = 0;
2969 #endif
2970
2971         /*-
2972          * For boundall we can use any address in the association.
2973          * If non_asoc_addr_ok is set we can use any address (at least in
2974          * theory). So we look for preferred addresses first. If we find one,
2975          * we use it. Otherwise we next try to get an address on the
2976          * interface, which we should be able to do (unless non_asoc_addr_ok
2977          * is false and we are routed out that way). In these cases where we
2978          * can't use the address of the interface we go through all the
2979          * ifn's looking for an address we can use and fill that in. Punting
2980          * means we send back address 0, which will probably cause problems
2981          * actually since then IP will fill in the address of the route ifn,
2982          * which means we probably already rejected it.. i.e. here comes an
2983          * abort :-<.
2984          */
2985         vrf = sctp_find_vrf(vrf_id);
2986         if (vrf == NULL)
2987                 return (NULL);
2988
2989         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2990         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2991         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2992         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2993         if (sctp_ifn == NULL) {
2994                 /* ?? We don't have this guy ?? */
2995                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2996                 goto bound_all_plan_b;
2997         }
2998         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2999             ifn_index, sctp_ifn->ifn_name);
3000
3001         if (net) {
3002                 cur_addr_num = net->indx_of_eligible_next_to_use;
3003         }
3004         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3005             inp, stcb,
3006             non_asoc_addr_ok,
3007             dest_is_loop,
3008             dest_is_priv, fam);
3009         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3010             num_preferred, sctp_ifn->ifn_name);
3011         if (num_preferred == 0) {
3012                 /*
3013                  * no eligible addresses, we must use some other interface
3014                  * address if we can find one.
3015                  */
3016                 goto bound_all_plan_b;
3017         }
3018         /*
3019          * Ok we have num_eligible_addr set with how many we can use, this
3020          * may vary from call to call due to addresses being deprecated
3021          * etc..
3022          */
3023         if (cur_addr_num >= num_preferred) {
3024                 cur_addr_num = 0;
3025         }
3026         /*
3027          * select the nth address from the list (where cur_addr_num is the
3028          * nth) and 0 is the first one, 1 is the second one etc...
3029          */
3030         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3031
3032         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3033             dest_is_priv, cur_addr_num, fam, ro);
3034
3035         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3036         if (sctp_ifa) {
3037                 atomic_add_int(&sctp_ifa->refcount, 1);
3038                 if (net) {
3039                         /* save off where the next one we will want */
3040                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3041                 }
3042                 return (sctp_ifa);
3043         }
3044         /*
3045          * plan_b: Look at all interfaces and find a preferred address. If
3046          * no preferred fall through to plan_c.
3047          */
3048 bound_all_plan_b:
3049         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3050         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3051                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3052                     sctp_ifn->ifn_name);
3053                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054                         /* wrong base scope */
3055                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3056                         continue;
3057                 }
3058                 if ((sctp_ifn == looked_at) && looked_at) {
3059                         /* already looked at this guy */
3060                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3061                         continue;
3062                 }
3063                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3064                     dest_is_loop, dest_is_priv, fam);
3065                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3066                     "Found ifn:%p %d preferred source addresses\n",
3067                     ifn, num_preferred);
3068                 if (num_preferred == 0) {
3069                         /* None on this interface. */
3070                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3071                         continue;
3072                 }
3073                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3074                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3075                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3076
3077                 /*
3078                  * Ok we have num_eligible_addr set with how many we can
3079                  * use, this may vary from call to call due to addresses
3080                  * being deprecated etc..
3081                  */
3082                 if (cur_addr_num >= num_preferred) {
3083                         cur_addr_num = 0;
3084                 }
3085                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3086                     dest_is_priv, cur_addr_num, fam, ro);
3087                 if (sifa == NULL)
3088                         continue;
3089                 if (net) {
3090                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3091                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3092                             cur_addr_num);
3093                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3094                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3096                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3097                 }
3098                 atomic_add_int(&sifa->refcount, 1);
3099                 return (sifa);
3100         }
3101 #ifdef INET
3102 again_with_private_addresses_allowed:
3103 #endif
3104         /* plan_c: do we have an acceptable address on the emit interface */
3105         sifa = NULL;
3106         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3107         if (emit_ifn == NULL) {
3108                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3109                 goto plan_d;
3110         }
3111         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3113 #ifdef INET
3114                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3115                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3116                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3117                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3118                         continue;
3119                 }
3120 #endif
3121 #ifdef INET6
3122                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3123                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3124                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3125                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3126                         continue;
3127                 }
3128 #endif
3129                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3130                     (non_asoc_addr_ok == 0)) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3132                         continue;
3133                 }
3134                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3135                     dest_is_priv, fam);
3136                 if (sifa == NULL) {
3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3138                         continue;
3139                 }
3140                 if (stcb) {
3141                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3142                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3143                                 sifa = NULL;
3144                                 continue;
3145                         }
3146                         if (((non_asoc_addr_ok == 0) &&
3147                             (sctp_is_addr_restricted(stcb, sifa))) ||
3148                             (non_asoc_addr_ok &&
3149                             (sctp_is_addr_restricted(stcb, sifa)) &&
3150                             (!sctp_is_addr_pending(stcb, sifa)))) {
3151                                 /*
3152                                  * It is restricted for some reason..
3153                                  * probably not yet added.
3154                                  */
3155                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3156                                 sifa = NULL;
3157                                 continue;
3158                         }
3159                 }
3160                 atomic_add_int(&sifa->refcount, 1);
3161                 goto out;
3162         }
3163 plan_d:
3164         /*
3165          * plan_d: We are in trouble. No preferred address on the emit
3166          * interface. And not even a preferred address on all interfaces. Go
3167          * out and see if we can find an acceptable address somewhere
3168          * amongst all interfaces.
3169          */
3170         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3171         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3172                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3173                         /* wrong base scope */
3174                         continue;
3175                 }
3176                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3177 #ifdef INET
3178                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3179                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3180                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3181                                 continue;
3182                         }
3183 #endif
3184 #ifdef INET6
3185                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3186                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3187                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3188                                 continue;
3189                         }
3190 #endif
3191                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3192                             (non_asoc_addr_ok == 0))
3193                                 continue;
3194                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3195                             dest_is_loop,
3196                             dest_is_priv, fam);
3197                         if (sifa == NULL)
3198                                 continue;
3199                         if (stcb) {
3200                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3201                                         sifa = NULL;
3202                                         continue;
3203                                 }
3204                                 if (((non_asoc_addr_ok == 0) &&
3205                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3206                                     (non_asoc_addr_ok &&
3207                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3208                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3209                                         /*
3210                                          * It is restricted for some
3211                                          * reason.. probably not yet added.
3212                                          */
3213                                         sifa = NULL;
3214                                         continue;
3215                                 }
3216                         }
3217                         goto out;
3218                 }
3219         }
3220 #ifdef INET
3221         if (stcb) {
3222                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3223                         stcb->asoc.scope.ipv4_local_scope = 1;
3224                         retried = 1;
3225                         goto again_with_private_addresses_allowed;
3226                 } else if (retried == 1) {
3227                         stcb->asoc.scope.ipv4_local_scope = 0;
3228                 }
3229         }
3230 #endif
3231 out:
3232 #ifdef INET
3233         if (sifa) {
3234                 if (retried == 1) {
3235                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3236                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3237                                         /* wrong base scope */
3238                                         continue;
3239                                 }
3240                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3241                                         struct sctp_ifa *tmp_sifa;
3242
3243 #ifdef INET
3244                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3245                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3246                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3247                                                 continue;
3248                                         }
3249 #endif
3250 #ifdef INET6
3251                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3252                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3253                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3254                                                 continue;
3255                                         }
3256 #endif
3257                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3258                                             (non_asoc_addr_ok == 0))
3259                                                 continue;
3260                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3261                                             dest_is_loop,
3262                                             dest_is_priv, fam);
3263                                         if (tmp_sifa == NULL) {
3264                                                 continue;
3265                                         }
3266                                         if (tmp_sifa == sifa) {
3267                                                 continue;
3268                                         }
3269                                         if (stcb) {
3270                                                 if (sctp_is_address_in_scope(tmp_sifa,
3271                                                     &stcb->asoc.scope, 0) == 0) {
3272                                                         continue;
3273                                                 }
3274                                                 if (((non_asoc_addr_ok == 0) &&
3275                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3276                                                     (non_asoc_addr_ok &&
3277                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3278                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3279                                                         /*
3280                                                          * It is restricted
3281                                                          * for some reason..
3282                                                          * probably not yet
3283                                                          * added.
3284                                                          */
3285                                                         continue;
3286                                                 }
3287                                         }
3288                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3289                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3290                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3291                                         }
3292                                 }
3293                         }
3294                 }
3295                 atomic_add_int(&sifa->refcount, 1);
3296         }
3297 #endif
3298         return (sifa);
3299 }
3300
3301
3302
3303 /* tcb may be NULL */
3304 struct sctp_ifa *
3305 sctp_source_address_selection(struct sctp_inpcb *inp,
3306     struct sctp_tcb *stcb,
3307     sctp_route_t *ro,
3308     struct sctp_nets *net,
3309     int non_asoc_addr_ok, uint32_t vrf_id)
3310 {
3311         struct sctp_ifa *answer;
3312         uint8_t dest_is_priv, dest_is_loop;
3313         sa_family_t fam;
3314 #ifdef INET
3315         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3316 #endif
3317 #ifdef INET6
3318         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3319 #endif
3320
3321         /**
3322          * Rules:
3323          * - Find the route if needed, cache if I can.
3324          * - Look at interface address in route, Is it in the bound list. If so we
3325          *   have the best source.
3326          * - If not we must rotate amongst the addresses.
3327          *
3328          * Cavets and issues
3329          *
3330          * Do we need to pay attention to scope. We can have a private address
3331          * or a global address we are sourcing or sending to. So if we draw
3332          * it out
3333          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3334          * For V4
3335          * ------------------------------------------
3336          *      source     *      dest  *  result
3337          * -----------------------------------------
3338          * <a>  Private    *    Global  *  NAT
3339          * -----------------------------------------
3340          * <b>  Private    *    Private *  No problem
3341          * -----------------------------------------
3342          * <c>  Global     *    Private *  Huh, How will this work?
3343          * -----------------------------------------
3344          * <d>  Global     *    Global  *  No Problem
3345          *------------------------------------------
3346          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3347          * For V6
3348          *------------------------------------------
3349          *      source     *      dest  *  result
3350          * -----------------------------------------
3351          * <a>  Linklocal  *    Global  *
3352          * -----------------------------------------
3353          * <b>  Linklocal  * Linklocal  *  No problem
3354          * -----------------------------------------
3355          * <c>  Global     * Linklocal  *  Huh, How will this work?
3356          * -----------------------------------------
3357          * <d>  Global     *    Global  *  No Problem
3358          *------------------------------------------
3359          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3360          *
3361          * And then we add to that what happens if there are multiple addresses
3362          * assigned to an interface. Remember the ifa on a ifn is a linked
3363          * list of addresses. So one interface can have more than one IP
3364          * address. What happens if we have both a private and a global
3365          * address? Do we then use context of destination to sort out which
3366          * one is best? And what about NAT's sending P->G may get you a NAT
3367          * translation, or should you select the G thats on the interface in
3368          * preference.
3369          *
3370          * Decisions:
3371          *
3372          * - count the number of addresses on the interface.
3373          * - if it is one, no problem except case <c>.
3374          *   For <a> we will assume a NAT out there.
3375          * - if there are more than one, then we need to worry about scope P
3376          *   or G. We should prefer G -> G and P -> P if possible.
3377          *   Then as a secondary fall back to mixed types G->P being a last
3378          *   ditch one.
3379          * - The above all works for bound all, but bound specific we need to
3380          *   use the same concept but instead only consider the bound
3381          *   addresses. If the bound set is NOT assigned to the interface then
3382          *   we must use rotation amongst the bound addresses..
3383          */
3384         if (ro->ro_rt == NULL) {
3385                 /*
3386                  * Need a route to cache.
3387                  */
3388                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3389         }
3390         if (ro->ro_rt == NULL) {
3391                 return (NULL);
3392         }
3393         fam = ro->ro_dst.sa_family;
3394         dest_is_priv = dest_is_loop = 0;
3395         /* Setup our scopes for the destination */
3396         switch (fam) {
3397 #ifdef INET
3398         case AF_INET:
3399                 /* Scope based on outbound address */
3400                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3401                         dest_is_loop = 1;
3402                         if (net != NULL) {
3403                                 /* mark it as local */
3404                                 net->addr_is_local = 1;
3405                         }
3406                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3407                         dest_is_priv = 1;
3408                 }
3409                 break;
3410 #endif
3411 #ifdef INET6
3412         case AF_INET6:
3413                 /* Scope based on outbound address */
3414                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3415                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3416                         /*
3417                          * If the address is a loopback address, which
3418                          * consists of "::1" OR "fe80::1%lo0", we are
3419                          * loopback scope. But we don't use dest_is_priv
3420                          * (link local addresses).
3421                          */
3422                         dest_is_loop = 1;
3423                         if (net != NULL) {
3424                                 /* mark it as local */
3425                                 net->addr_is_local = 1;
3426                         }
3427                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3428                         dest_is_priv = 1;
3429                 }
3430                 break;
3431 #endif
3432         }
3433         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3434         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3435         SCTP_IPI_ADDR_RLOCK();
3436         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3437                 /*
3438                  * Bound all case
3439                  */
3440                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3441                     dest_is_priv, dest_is_loop,
3442                     non_asoc_addr_ok, fam);
3443                 SCTP_IPI_ADDR_RUNLOCK();
3444                 return (answer);
3445         }
3446         /*
3447          * Subset bound case
3448          */
3449         if (stcb) {
3450                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3451                     vrf_id, dest_is_priv,
3452                     dest_is_loop,
3453                     non_asoc_addr_ok, fam);
3454         } else {
3455                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3456                     non_asoc_addr_ok,
3457                     dest_is_priv,
3458                     dest_is_loop, fam);
3459         }
3460         SCTP_IPI_ADDR_RUNLOCK();
3461         return (answer);
3462 }
3463
3464 static int
3465 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3466 {
3467         struct cmsghdr cmh;
3468         int tlen, at, found;
3469         struct sctp_sndinfo sndinfo;
3470         struct sctp_prinfo prinfo;
3471         struct sctp_authinfo authinfo;
3472
3473         tlen = SCTP_BUF_LEN(control);
3474         at = 0;
3475         found = 0;
3476         /*
3477          * Independent of how many mbufs, find the c_type inside the control
3478          * structure and copy out the data.
3479          */
3480         while (at < tlen) {
3481                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3482                         /* There is not enough room for one more. */
3483                         return (found);
3484                 }
3485                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3486                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3487                         /* We dont't have a complete CMSG header. */
3488                         return (found);
3489                 }
3490                 if (((int)cmh.cmsg_len + at) > tlen) {
3491                         /* We don't have the complete CMSG. */
3492                         return (found);
3493                 }
3494                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3495                     ((c_type == cmh.cmsg_type) ||
3496                     ((c_type == SCTP_SNDRCV) &&
3497                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3498                     (cmh.cmsg_type == SCTP_PRINFO) ||
3499                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3500                         if (c_type == cmh.cmsg_type) {
3501                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3502                                         return (found);
3503                                 }
3504                                 /* It is exactly what we want. Copy it out. */
3505                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3506                                 return (1);
3507                         } else {
3508                                 struct sctp_sndrcvinfo *sndrcvinfo;
3509
3510                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3511                                 if (found == 0) {
3512                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3513                                                 return (found);
3514                                         }
3515                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3516                                 }
3517                                 switch (cmh.cmsg_type) {
3518                                 case SCTP_SNDINFO:
3519                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3520                                                 return (found);
3521                                         }
3522                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3523                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3524                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3525                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3526                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3527                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3528                                         break;
3529                                 case SCTP_PRINFO:
3530                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3531                                                 return (found);
3532                                         }
3533                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3534                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3535                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3536                                         } else {
3537                                                 sndrcvinfo->sinfo_timetolive = 0;
3538                                         }
3539                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3540                                         break;
3541                                 case SCTP_AUTHINFO:
3542                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3543                                                 return (found);
3544                                         }
3545                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3546                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3547                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3548                                         break;
3549                                 default:
3550                                         return (found);
3551                                 }
3552                                 found = 1;
3553                         }
3554                 }
3555                 at += CMSG_ALIGN(cmh.cmsg_len);
3556         }
3557         return (found);
3558 }
3559
3560 static int
3561 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3562 {
3563         struct cmsghdr cmh;
3564         int tlen, at;
3565         struct sctp_initmsg initmsg;
3566 #ifdef INET
3567         struct sockaddr_in sin;
3568 #endif
3569 #ifdef INET6
3570         struct sockaddr_in6 sin6;
3571 #endif
3572
3573         tlen = SCTP_BUF_LEN(control);
3574         at = 0;
3575         while (at < tlen) {
3576                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3577                         /* There is not enough room for one more. */
3578                         *error = EINVAL;
3579                         return (1);
3580                 }
3581                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3582                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3583                         /* We dont't have a complete CMSG header. */
3584                         *error = EINVAL;
3585                         return (1);
3586                 }
3587                 if (((int)cmh.cmsg_len + at) > tlen) {
3588                         /* We don't have the complete CMSG. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3593                         switch (cmh.cmsg_type) {
3594                         case SCTP_INIT:
3595                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3596                                         *error = EINVAL;
3597                                         return (1);
3598                                 }
3599                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3600                                 if (initmsg.sinit_max_attempts)
3601                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3602                                 if (initmsg.sinit_num_ostreams)
3603                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3604                                 if (initmsg.sinit_max_instreams)
3605                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3606                                 if (initmsg.sinit_max_init_timeo)
3607                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3608                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3609                                         struct sctp_stream_out *tmp_str;
3610                                         unsigned int i;
3611 #if defined(SCTP_DETAILED_STR_STATS)
3612                                         int j;
3613 #endif
3614
3615                                         /* Default is NOT correct */
3616                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3617                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3618                                         SCTP_TCB_UNLOCK(stcb);
3619                                         SCTP_MALLOC(tmp_str,
3620                                             struct sctp_stream_out *,
3621                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3622                                             SCTP_M_STRMO);
3623                                         SCTP_TCB_LOCK(stcb);
3624                                         if (tmp_str != NULL) {
3625                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3626                                                 stcb->asoc.strmout = tmp_str;
3627                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3628                                         } else {
3629                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3630                                         }
3631                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3632                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3633                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3634                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3635                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3636 #if defined(SCTP_DETAILED_STR_STATS)
3637                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3638                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3639                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3640                                                 }
3641 #else
3642                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3643                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3644 #endif
3645                                                 stcb->asoc.strmout[i].sid = i;
3646                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3649                                         }
3650                                 }
3651                                 break;
3652 #ifdef INET
3653                         case SCTP_DSTADDRV4:
3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3655                                         *error = EINVAL;
3656                                         return (1);
3657                                 }
3658                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3659                                 sin.sin_family = AF_INET;
3660                                 sin.sin_len = sizeof(struct sockaddr_in);
3661                                 sin.sin_port = stcb->rport;
3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3663                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3664                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3665                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3670                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3671                                         *error = ENOBUFS;
3672                                         return (1);
3673                                 }
3674                                 break;
3675 #endif
3676 #ifdef INET6
3677                         case SCTP_DSTADDRV6:
3678                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3679                                         *error = EINVAL;
3680                                         return (1);
3681                                 }
3682                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3683                                 sin6.sin6_family = AF_INET6;
3684                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3685                                 sin6.sin6_port = stcb->rport;
3686                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3687                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3688                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3689                                         *error = EINVAL;
3690                                         return (1);
3691                                 }
3692 #ifdef INET
3693                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3694                                         in6_sin6_2_sin(&sin, &sin6);
3695                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3696                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3697                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3698                                                 *error = EINVAL;
3699                                                 return (1);
3700                                         }
3701                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3702                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703                                                 *error = ENOBUFS;
3704                                                 return (1);
3705                                         }
3706                                 } else
3707 #endif
3708                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3709                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710                                         *error = ENOBUFS;
3711                                         return (1);
3712                                 }
3713                                 break;
3714 #endif
3715                         default:
3716                                 break;
3717                         }
3718                 }
3719                 at += CMSG_ALIGN(cmh.cmsg_len);
3720         }
3721         return (0);
3722 }
3723
3724 static struct sctp_tcb *
3725 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3726     uint16_t port,
3727     struct mbuf *control,
3728     struct sctp_nets **net_p,
3729     int *error)
3730 {
3731         struct cmsghdr cmh;
3732         int tlen, at;
3733         struct sctp_tcb *stcb;
3734         struct sockaddr *addr;
3735 #ifdef INET
3736         struct sockaddr_in sin;
3737 #endif
3738 #ifdef INET6
3739         struct sockaddr_in6 sin6;
3740 #endif
3741
3742         tlen = SCTP_BUF_LEN(control);
3743         at = 0;
3744         while (at < tlen) {
3745                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3746                         /* There is not enough room for one more. */
3747                         *error = EINVAL;
3748                         return (NULL);
3749                 }
3750                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3751                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3752                         /* We dont't have a complete CMSG header. */
3753                         *error = EINVAL;
3754                         return (NULL);
3755                 }
3756                 if (((int)cmh.cmsg_len + at) > tlen) {
3757                         /* We don't have the complete CMSG. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3762                         switch (cmh.cmsg_type) {
3763 #ifdef INET
3764                         case SCTP_DSTADDRV4:
3765                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3766                                         *error = EINVAL;
3767                                         return (NULL);
3768                                 }
3769                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3770                                 sin.sin_family = AF_INET;
3771                                 sin.sin_len = sizeof(struct sockaddr_in);
3772                                 sin.sin_port = port;
3773                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3774                                 addr = (struct sockaddr *)&sin;
3775                                 break;
3776 #endif
3777 #ifdef INET6
3778                         case SCTP_DSTADDRV6:
3779                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3780                                         *error = EINVAL;
3781                                         return (NULL);
3782                                 }
3783                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3784                                 sin6.sin6_family = AF_INET6;
3785                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3786                                 sin6.sin6_port = port;
3787                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3788 #ifdef INET
3789                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3790                                         in6_sin6_2_sin(&sin, &sin6);
3791                                         addr = (struct sockaddr *)&sin;
3792                                 } else
3793 #endif
3794                                         addr = (struct sockaddr *)&sin6;
3795                                 break;
3796 #endif
3797                         default:
3798                                 addr = NULL;
3799                                 break;
3800                         }
3801                         if (addr) {
3802                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3803                                 if (stcb != NULL) {
3804                                         return (stcb);
3805                                 }
3806                         }
3807                 }
3808                 at += CMSG_ALIGN(cmh.cmsg_len);
3809         }
3810         return (NULL);
3811 }
3812
3813 static struct mbuf *
3814 sctp_add_cookie(struct mbuf *init, int init_offset,
3815     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3816 {
3817         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3818         struct sctp_state_cookie *stc;
3819         struct sctp_paramhdr *ph;
3820         uint8_t *foo;
3821         int sig_offset;
3822         uint16_t cookie_sz;
3823
3824         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3825             sizeof(struct sctp_paramhdr)), 0,
3826             M_NOWAIT, 1, MT_DATA);
3827         if (mret == NULL) {
3828                 return (NULL);
3829         }
3830         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3831         if (copy_init == NULL) {
3832                 sctp_m_freem(mret);
3833                 return (NULL);
3834         }
3835 #ifdef SCTP_MBUF_LOGGING
3836         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3837                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3838         }
3839 #endif
3840         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3841             M_NOWAIT);
3842         if (copy_initack == NULL) {
3843                 sctp_m_freem(mret);
3844                 sctp_m_freem(copy_init);
3845                 return (NULL);
3846         }
3847 #ifdef SCTP_MBUF_LOGGING
3848         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3850         }
3851 #endif
3852         /* easy side we just drop it on the end */
3853         ph = mtod(mret, struct sctp_paramhdr *);
3854         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3855             sizeof(struct sctp_paramhdr);
3856         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3857             sizeof(struct sctp_paramhdr));
3858         ph->param_type = htons(SCTP_STATE_COOKIE);
3859         ph->param_length = 0;   /* fill in at the end */
3860         /* Fill in the stc cookie data */
3861         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3862
3863         /* tack the INIT and then the INIT-ACK onto the chain */
3864         cookie_sz = 0;
3865         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3866                 cookie_sz += SCTP_BUF_LEN(m_at);
3867                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3868                         SCTP_BUF_NEXT(m_at) = copy_init;
3869                         break;
3870                 }
3871         }
3872         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3873                 cookie_sz += SCTP_BUF_LEN(m_at);
3874                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3875                         SCTP_BUF_NEXT(m_at) = copy_initack;
3876                         break;
3877                 }
3878         }
3879         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880                 cookie_sz += SCTP_BUF_LEN(m_at);
3881                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3882                         break;
3883                 }
3884         }
3885         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3886         if (sig == NULL) {
3887                 /* no space, so free the entire chain */
3888                 sctp_m_freem(mret);
3889                 return (NULL);
3890         }
3891         SCTP_BUF_LEN(sig) = 0;
3892         SCTP_BUF_NEXT(m_at) = sig;
3893         sig_offset = 0;
3894         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3895         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3896         *signature = foo;
3897         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3898         cookie_sz += SCTP_SIGNATURE_SIZE;
3899         ph->param_length = htons(cookie_sz);
3900         return (mret);
3901 }
3902
3903
3904 static uint8_t
3905 sctp_get_ect(struct sctp_tcb *stcb)
3906 {
3907         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3908                 return (SCTP_ECT0_BIT);
3909         } else {
3910                 return (0);
3911         }
3912 }
3913
3914 #if defined(INET) || defined(INET6)
3915 static void
3916 sctp_handle_no_route(struct sctp_tcb *stcb,
3917     struct sctp_nets *net,
3918     int so_locked)
3919 {
3920         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3921
3922         if (net) {
3923                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3924                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3925                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3926                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3927                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3928                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3929                                     stcb, 0,
3930                                     (void *)net,
3931                                     so_locked);
3932                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3933                                 net->dest_state &= ~SCTP_ADDR_PF;
3934                         }
3935                 }
3936                 if (stcb) {
3937                         if (net == stcb->asoc.primary_destination) {
3938                                 /* need a new primary */
3939                                 struct sctp_nets *alt;
3940
3941                                 alt = sctp_find_alternate_net(stcb, net, 0);
3942                                 if (alt != net) {
3943                                         if (stcb->asoc.alternate) {
3944                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3945                                         }
3946                                         stcb->asoc.alternate = alt;
3947                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3948                                         if (net->ro._s_addr) {
3949                                                 sctp_free_ifa(net->ro._s_addr);
3950                                                 net->ro._s_addr = NULL;
3951                                         }
3952                                         net->src_addr_selected = 0;
3953                                 }
3954                         }
3955                 }
3956         }
3957 }
3958 #endif
3959
3960 static int
3961 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3962     struct sctp_tcb *stcb,      /* may be NULL */
3963     struct sctp_nets *net,
3964     struct sockaddr *to,
3965     struct mbuf *m,
3966     uint32_t auth_offset,
3967     struct sctp_auth_chunk *auth,
3968     uint16_t auth_keyid,
3969     int nofragment_flag,
3970     int ecn_ok,
3971     int out_of_asoc_ok,
3972     uint16_t src_port,
3973     uint16_t dest_port,
3974     uint32_t v_tag,
3975     uint16_t port,
3976     union sctp_sockstore *over_addr,
3977     uint8_t mflowtype, uint32_t mflowid,
3978 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3979     int so_locked SCTP_UNUSED
3980 #else
3981     int so_locked
3982 #endif
3983 )
3984 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3985 {
3986         /**
3987          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3988          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3989          * - fill in the HMAC digest of any AUTH chunk in the packet.
3990          * - calculate and fill in the SCTP checksum.
3991          * - prepend an IP address header.
3992          * - if boundall use INADDR_ANY.
3993          * - if boundspecific do source address selection.
3994          * - set fragmentation option for ipV4.
3995          * - On return from IP output, check/adjust mtu size of output
3996          *   interface and smallest_mtu size as well.
3997          */
3998         /* Will need ifdefs around this */
3999         struct mbuf *newm;
4000         struct sctphdr *sctphdr;
4001         int packet_length;
4002         int ret;
4003 #if defined(INET) || defined(INET6)
4004         uint32_t vrf_id;
4005 #endif
4006 #if defined(INET) || defined(INET6)
4007         struct mbuf *o_pak;
4008         sctp_route_t *ro = NULL;
4009         struct udphdr *udp = NULL;
4010 #endif
4011         uint8_t tos_value;
4012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4013         struct socket *so = NULL;
4014 #endif
4015
4016         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4017                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4018                 sctp_m_freem(m);
4019                 return (EFAULT);
4020         }
4021 #if defined(INET) || defined(INET6)
4022         if (stcb) {
4023                 vrf_id = stcb->asoc.vrf_id;
4024         } else {
4025                 vrf_id = inp->def_vrf_id;
4026         }
4027 #endif
4028         /* fill in the HMAC digest for any AUTH chunk in the packet */
4029         if ((auth != NULL) && (stcb != NULL)) {
4030                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4031         }
4032         if (net) {
4033                 tos_value = net->dscp;
4034         } else if (stcb) {
4035                 tos_value = stcb->asoc.default_dscp;
4036         } else {
4037                 tos_value = inp->sctp_ep.default_dscp;
4038         }
4039
4040         switch (to->sa_family) {
4041 #ifdef INET
4042         case AF_INET:
4043                 {
4044                         struct ip *ip = NULL;
4045                         sctp_route_t iproute;
4046                         int len;
4047
4048                         len = SCTP_MIN_V4_OVERHEAD;
4049                         if (port) {
4050                                 len += sizeof(struct udphdr);
4051                         }
4052                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4053                         if (newm == NULL) {
4054                                 sctp_m_freem(m);
4055                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4056                                 return (ENOMEM);
4057                         }
4058                         SCTP_ALIGN_TO_END(newm, len);
4059                         SCTP_BUF_LEN(newm) = len;
4060                         SCTP_BUF_NEXT(newm) = m;
4061                         m = newm;
4062                         if (net != NULL) {
4063                                 m->m_pkthdr.flowid = net->flowid;
4064                                 M_HASHTYPE_SET(m, net->flowtype);
4065                         } else {
4066                                 m->m_pkthdr.flowid = mflowid;
4067                                 M_HASHTYPE_SET(m, mflowtype);
4068                         }
4069                         packet_length = sctp_calculate_len(m);
4070                         ip = mtod(m, struct ip *);
4071                         ip->ip_v = IPVERSION;
4072                         ip->ip_hl = (sizeof(struct ip) >> 2);
4073                         if (tos_value == 0) {
4074                                 /*
4075                                  * This means especially, that it is not set
4076                                  * at the SCTP layer. So use the value from
4077                                  * the IP layer.
4078                                  */
4079                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4080                         }
4081                         tos_value &= 0xfc;
4082                         if (ecn_ok) {
4083                                 tos_value |= sctp_get_ect(stcb);
4084                         }
4085                         if ((nofragment_flag) && (port == 0)) {
4086                                 ip->ip_off = htons(IP_DF);
4087                         } else {
4088                                 ip->ip_off = htons(0);
4089                         }
4090                         /* FreeBSD has a function for ip_id's */
4091                         ip_fillid(ip);
4092
4093                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4094                         ip->ip_len = htons(packet_length);
4095                         ip->ip_tos = tos_value;
4096                         if (port) {
4097                                 ip->ip_p = IPPROTO_UDP;
4098                         } else {
4099                                 ip->ip_p = IPPROTO_SCTP;
4100                         }
4101                         ip->ip_sum = 0;
4102                         if (net == NULL) {
4103                                 ro = &iproute;
4104                                 memset(&iproute, 0, sizeof(iproute));
4105                                 memcpy(&ro->ro_dst, to, to->sa_len);
4106                         } else {
4107                                 ro = (sctp_route_t *)&net->ro;
4108                         }
4109                         /* Now the address selection part */
4110                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4111
4112                         /* call the routine to select the src address */
4113                         if (net && out_of_asoc_ok == 0) {
4114                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4115                                         sctp_free_ifa(net->ro._s_addr);
4116                                         net->ro._s_addr = NULL;
4117                                         net->src_addr_selected = 0;
4118                                         if (ro->ro_rt) {
4119                                                 RTFREE(ro->ro_rt);
4120                                                 ro->ro_rt = NULL;
4121                                         }
4122                                 }
4123                                 if (net->src_addr_selected == 0) {
4124                                         /* Cache the source address */
4125                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4126                                             ro, net, 0,
4127                                             vrf_id);
4128                                         net->src_addr_selected = 1;
4129                                 }
4130                                 if (net->ro._s_addr == NULL) {
4131                                         /* No route to host */
4132                                         net->src_addr_selected = 0;
4133                                         sctp_handle_no_route(stcb, net, so_locked);
4134                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135                                         sctp_m_freem(m);
4136                                         return (EHOSTUNREACH);
4137                                 }
4138                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4139                         } else {
4140                                 if (over_addr == NULL) {
4141                                         struct sctp_ifa *_lsrc;
4142
4143                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4144                                             net,
4145                                             out_of_asoc_ok,
4146                                             vrf_id);
4147                                         if (_lsrc == NULL) {
4148                                                 sctp_handle_no_route(stcb, net, so_locked);
4149                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4150                                                 sctp_m_freem(m);
4151                                                 return (EHOSTUNREACH);
4152                                         }
4153                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4154                                         sctp_free_ifa(_lsrc);
4155                                 } else {
4156                                         ip->ip_src = over_addr->sin.sin_addr;
4157                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4158                                 }
4159                         }
4160                         if (port) {
4161                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4162                                         sctp_handle_no_route(stcb, net, so_locked);
4163                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4164                                         sctp_m_freem(m);
4165                                         return (EHOSTUNREACH);
4166                                 }
4167                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4168                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4169                                 udp->uh_dport = port;
4170                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4171                                 if (V_udp_cksum) {
4172                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4173                                 } else {
4174                                         udp->uh_sum = 0;
4175                                 }
4176                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4177                         } else {
4178                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4179                         }
4180
4181                         sctphdr->src_port = src_port;
4182                         sctphdr->dest_port = dest_port;
4183                         sctphdr->v_tag = v_tag;
4184                         sctphdr->checksum = 0;
4185
4186                         /*
4187                          * If source address selection fails and we find no
4188                          * route then the ip_output should fail as well with
4189                          * a NO_ROUTE_TO_HOST type error. We probably should
4190                          * catch that somewhere and abort the association
4191                          * right away (assuming this is an INIT being sent).
4192                          */
4193                         if (ro->ro_rt == NULL) {
4194                                 /*
4195                                  * src addr selection failed to find a route
4196                                  * (or valid source addr), so we can't get
4197                                  * there from here (yet)!
4198                                  */
4199                                 sctp_handle_no_route(stcb, net, so_locked);
4200                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201                                 sctp_m_freem(m);
4202                                 return (EHOSTUNREACH);
4203                         }
4204                         if (ro != &iproute) {
4205                                 memcpy(&iproute, ro, sizeof(*ro));
4206                         }
4207                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4208                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4209                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4210                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4211                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4212                             (void *)ro->ro_rt);
4213
4214                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4215                                 /* failed to prepend data, give up */
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4217                                 sctp_m_freem(m);
4218                                 return (ENOMEM);
4219                         }
4220                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4221                         if (port) {
4222 #if defined(SCTP_WITH_NO_CSUM)
4223                                 SCTP_STAT_INCR(sctps_sendnocrc);
4224 #else
4225                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4226                                 SCTP_STAT_INCR(sctps_sendswcrc);
4227 #endif
4228                                 if (V_udp_cksum) {
4229                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4230                                 }
4231                         } else {
4232 #if defined(SCTP_WITH_NO_CSUM)
4233                                 SCTP_STAT_INCR(sctps_sendnocrc);
4234 #else
4235                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4236                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4237                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4238 #endif
4239                         }
4240 #ifdef SCTP_PACKET_LOGGING
4241                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4242                                 sctp_packet_log(o_pak);
4243 #endif
4244                         /* send it out.  table id is taken from stcb */
4245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4246                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4247                                 so = SCTP_INP_SO(inp);
4248                                 SCTP_SOCKET_UNLOCK(so, 0);
4249                         }
4250 #endif
4251                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4253                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4254                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4255                                 SCTP_TCB_UNLOCK(stcb);
4256                                 SCTP_SOCKET_LOCK(so, 0);
4257                                 SCTP_TCB_LOCK(stcb);
4258                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4259                         }
4260 #endif
4261                         SCTP_STAT_INCR(sctps_sendpackets);
4262                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4263                         if (ret)
4264                                 SCTP_STAT_INCR(sctps_senderrors);
4265
4266                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4267                         if (net == NULL) {
4268                                 /* free tempy routes */
4269                                 RO_RTFREE(ro);
4270                         } else {
4271                                 /*
4272                                  * PMTU check versus smallest asoc MTU goes
4273                                  * here
4274                                  */
4275                                 if ((ro->ro_rt != NULL) &&
4276                                     (net->ro._s_addr)) {
4277                                         uint32_t mtu;
4278
4279                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4280                                         if (net->port) {
4281                                                 mtu -= sizeof(struct udphdr);
4282                                         }
4283                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4284                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4285                                                 net->mtu = mtu;
4286                                         }
4287                                 } else if (ro->ro_rt == NULL) {
4288                                         /* route was freed */
4289                                         if (net->ro._s_addr &&
4290                                             net->src_addr_selected) {
4291                                                 sctp_free_ifa(net->ro._s_addr);
4292                                                 net->ro._s_addr = NULL;
4293                                         }
4294                                         net->src_addr_selected = 0;
4295                                 }
4296                         }
4297                         return (ret);
4298                 }
4299 #endif
4300 #ifdef INET6
4301         case AF_INET6:
4302                 {
4303                         uint32_t flowlabel, flowinfo;
4304                         struct ip6_hdr *ip6h;
4305                         struct route_in6 ip6route;
4306                         struct ifnet *ifp;
4307                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4308                         int prev_scope = 0;
4309                         struct sockaddr_in6 lsa6_storage;
4310                         int error;
4311                         u_short prev_port = 0;
4312                         int len;
4313
4314                         if (net) {
4315                                 flowlabel = net->flowlabel;
4316                         } else if (stcb) {
4317                                 flowlabel = stcb->asoc.default_flowlabel;
4318                         } else {
4319                                 flowlabel = inp->sctp_ep.default_flowlabel;
4320                         }
4321                         if (flowlabel == 0) {
4322                                 /*
4323                                  * This means especially, that it is not set
4324                                  * at the SCTP layer. So use the value from
4325                                  * the IP layer.
4326                                  */
4327                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4328                         }
4329                         flowlabel &= 0x000fffff;
4330                         len = SCTP_MIN_OVERHEAD;
4331                         if (port) {
4332                                 len += sizeof(struct udphdr);
4333                         }
4334                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4335                         if (newm == NULL) {
4336                                 sctp_m_freem(m);
4337                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4338                                 return (ENOMEM);
4339                         }
4340                         SCTP_ALIGN_TO_END(newm, len);
4341                         SCTP_BUF_LEN(newm) = len;
4342                         SCTP_BUF_NEXT(newm) = m;
4343                         m = newm;
4344                         if (net != NULL) {
4345                                 m->m_pkthdr.flowid = net->flowid;
4346                                 M_HASHTYPE_SET(m, net->flowtype);
4347                         } else {
4348                                 m->m_pkthdr.flowid = mflowid;
4349                                 M_HASHTYPE_SET(m, mflowtype);
4350                         }
4351                         packet_length = sctp_calculate_len(m);
4352
4353                         ip6h = mtod(m, struct ip6_hdr *);
4354                         /* protect *sin6 from overwrite */
4355                         sin6 = (struct sockaddr_in6 *)to;
4356                         tmp = *sin6;
4357                         sin6 = &tmp;
4358
4359                         /* KAME hack: embed scopeid */
4360                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4361                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4362                                 return (EINVAL);
4363                         }
4364                         if (net == NULL) {
4365                                 memset(&ip6route, 0, sizeof(ip6route));
4366                                 ro = (sctp_route_t *)&ip6route;
4367                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4368                         } else {
4369                                 ro = (sctp_route_t *)&net->ro;
4370                         }
4371                         /*
4372                          * We assume here that inp_flow is in host byte
4373                          * order within the TCB!
4374                          */
4375                         if (tos_value == 0) {
4376                                 /*
4377                                  * This means especially, that it is not set
4378                                  * at the SCTP layer. So use the value from
4379                                  * the IP layer.
4380                                  */
4381                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4382                         }
4383                         tos_value &= 0xfc;
4384                         if (ecn_ok) {
4385                                 tos_value |= sctp_get_ect(stcb);
4386                         }
4387                         flowinfo = 0x06;
4388                         flowinfo <<= 8;
4389                         flowinfo |= tos_value;
4390                         flowinfo <<= 20;
4391                         flowinfo |= flowlabel;
4392                         ip6h->ip6_flow = htonl(flowinfo);
4393                         if (port) {
4394                                 ip6h->ip6_nxt = IPPROTO_UDP;
4395                         } else {
4396                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4397                         }
4398                         ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4399                         ip6h->ip6_dst = sin6->sin6_addr;
4400
4401                         /*
4402                          * Add SRC address selection here: we can only reuse
4403                          * to a limited degree the kame src-addr-sel, since
4404                          * we can try their selection but it may not be
4405                          * bound.
4406                          */
4407                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4408                         lsa6_tmp.sin6_family = AF_INET6;
4409                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4410                         lsa6 = &lsa6_tmp;
4411                         if (net && out_of_asoc_ok == 0) {
4412                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4413                                         sctp_free_ifa(net->ro._s_addr);
4414                                         net->ro._s_addr = NULL;
4415                                         net->src_addr_selected = 0;
4416                                         if (ro->ro_rt) {
4417                                                 RTFREE(ro->ro_rt);
4418                                                 ro->ro_rt = NULL;
4419                                         }
4420                                 }
4421                                 if (net->src_addr_selected == 0) {
4422                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4423                                         /* KAME hack: embed scopeid */
4424                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4425                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4426                                                 return (EINVAL);
4427                                         }
4428                                         /* Cache the source address */
4429                                         net->ro._s_addr = sctp_source_address_selection(inp,
4430                                             stcb,
4431                                             ro,
4432                                             net,
4433                                             0,
4434                                             vrf_id);
4435                                         (void)sa6_recoverscope(sin6);
4436                                         net->src_addr_selected = 1;
4437                                 }
4438                                 if (net->ro._s_addr == NULL) {
4439                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4440                                         net->src_addr_selected = 0;
4441                                         sctp_handle_no_route(stcb, net, so_locked);
4442                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4443                                         sctp_m_freem(m);
4444                                         return (EHOSTUNREACH);
4445                                 }
4446                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4447                         } else {
4448                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4449                                 /* KAME hack: embed scopeid */
4450                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4451                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4452                                         return (EINVAL);
4453                                 }
4454                                 if (over_addr == NULL) {
4455                                         struct sctp_ifa *_lsrc;
4456
4457                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4458                                             net,
4459                                             out_of_asoc_ok,
4460                                             vrf_id);
4461                                         if (_lsrc == NULL) {
4462                                                 sctp_handle_no_route(stcb, net, so_locked);
4463                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4464                                                 sctp_m_freem(m);
4465                                                 return (EHOSTUNREACH);
4466                                         }
4467                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4468                                         sctp_free_ifa(_lsrc);
4469                                 } else {
4470                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4471                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4472                                 }
4473                                 (void)sa6_recoverscope(sin6);
4474                         }
4475                         lsa6->sin6_port = inp->sctp_lport;
4476
4477                         if (ro->ro_rt == NULL) {
4478                                 /*
4479                                  * src addr selection failed to find a route
4480                                  * (or valid source addr), so we can't get
4481                                  * there from here!
4482                                  */
4483                                 sctp_handle_no_route(stcb, net, so_locked);
4484                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4485                                 sctp_m_freem(m);
4486                                 return (EHOSTUNREACH);
4487                         }
4488                         /*
4489                          * XXX: sa6 may not have a valid sin6_scope_id in
4490                          * the non-SCOPEDROUTING case.
4491                          */
4492                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4493                         lsa6_storage.sin6_family = AF_INET6;
4494                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4495                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4496                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4497                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4498                                 sctp_m_freem(m);
4499                                 return (error);
4500                         }
4501                         /* XXX */
4502                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4503                         lsa6_storage.sin6_port = inp->sctp_lport;
4504                         lsa6 = &lsa6_storage;
4505                         ip6h->ip6_src = lsa6->sin6_addr;
4506
4507                         if (port) {
4508                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4509                                         sctp_handle_no_route(stcb, net, so_locked);
4510                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4511                                         sctp_m_freem(m);
4512                                         return (EHOSTUNREACH);
4513                                 }
4514                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4515                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4516                                 udp->uh_dport = port;
4517                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4518                                 udp->uh_sum = 0;
4519                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4520                         } else {
4521                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4522                         }
4523
4524                         sctphdr->src_port = src_port;
4525                         sctphdr->dest_port = dest_port;
4526                         sctphdr->v_tag = v_tag;
4527                         sctphdr->checksum = 0;
4528
4529                         /*
4530                          * We set the hop limit now since there is a good
4531                          * chance that our ro pointer is now filled
4532                          */
4533                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4534                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4535
4536 #ifdef SCTP_DEBUG
4537                         /* Copy to be sure something bad is not happening */
4538                         sin6->sin6_addr = ip6h->ip6_dst;
4539                         lsa6->sin6_addr = ip6h->ip6_src;
4540 #endif
4541
4542                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4543                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4544                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4546                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4547                         if (net) {
4548                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4549                                 /*
4550                                  * preserve the port and scope for link
4551                                  * local send
4552                                  */
4553                                 prev_scope = sin6->sin6_scope_id;
4554                                 prev_port = sin6->sin6_port;
4555                         }
4556                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4557                                 /* failed to prepend data, give up */
4558                                 sctp_m_freem(m);
4559                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4560                                 return (ENOMEM);
4561                         }
4562                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4563                         if (port) {
4564 #if defined(SCTP_WITH_NO_CSUM)
4565                                 SCTP_STAT_INCR(sctps_sendnocrc);
4566 #else
4567                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4568                                 SCTP_STAT_INCR(sctps_sendswcrc);
4569 #endif
4570                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4571                                         udp->uh_sum = 0xffff;
4572                                 }
4573                         } else {
4574 #if defined(SCTP_WITH_NO_CSUM)
4575                                 SCTP_STAT_INCR(sctps_sendnocrc);
4576 #else
4577                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4578                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4579                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4580 #endif
4581                         }
4582                         /* send it out. table id is taken from stcb */
4583 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4584                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4585                                 so = SCTP_INP_SO(inp);
4586                                 SCTP_SOCKET_UNLOCK(so, 0);
4587                         }
4588 #endif
4589 #ifdef SCTP_PACKET_LOGGING
4590                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4591                                 sctp_packet_log(o_pak);
4592 #endif
4593                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4595                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4596                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4597                                 SCTP_TCB_UNLOCK(stcb);
4598                                 SCTP_SOCKET_LOCK(so, 0);
4599                                 SCTP_TCB_LOCK(stcb);
4600                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4601                         }
4602 #endif
4603                         if (net) {
4604                                 /* for link local this must be done */
4605                                 sin6->sin6_scope_id = prev_scope;
4606                                 sin6->sin6_port = prev_port;
4607                         }
4608                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4609                         SCTP_STAT_INCR(sctps_sendpackets);
4610                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4611                         if (ret) {
4612                                 SCTP_STAT_INCR(sctps_senderrors);
4613                         }
4614                         if (net == NULL) {
4615                                 /* Now if we had a temp route free it */
4616                                 RO_RTFREE(ro);
4617                         } else {
4618                                 /*
4619                                  * PMTU check versus smallest asoc MTU goes
4620                                  * here
4621                                  */
4622                                 if (ro->ro_rt == NULL) {
4623                                         /* Route was freed */
4624                                         if (net->ro._s_addr &&
4625                                             net->src_addr_selected) {
4626                                                 sctp_free_ifa(net->ro._s_addr);
4627                                                 net->ro._s_addr = NULL;
4628                                         }
4629                                         net->src_addr_selected = 0;
4630                                 }
4631                                 if ((ro->ro_rt != NULL) &&
4632                                     (net->ro._s_addr)) {
4633                                         uint32_t mtu;
4634
4635                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4636                                         if (mtu &&
4637                                             (stcb->asoc.smallest_mtu > mtu)) {
4638                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4639                                                 net->mtu = mtu;
4640                                                 if (net->port) {
4641                                                         net->mtu -= sizeof(struct udphdr);
4642                                                 }
4643                                         }
4644                                 } else if (ifp) {
4645                                         if (ND_IFINFO(ifp)->linkmtu &&
4646                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4647                                                 sctp_mtu_size_reset(inp,
4648                                                     &stcb->asoc,
4649                                                     ND_IFINFO(ifp)->linkmtu);
4650                                         }
4651                                 }
4652                         }
4653                         return (ret);
4654                 }
4655 #endif
4656         default:
4657                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4658                     ((struct sockaddr *)to)->sa_family);
4659                 sctp_m_freem(m);
4660                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4661                 return (EFAULT);
4662         }
4663 }
4664
4665
4666 void
4667 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4668 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4669     SCTP_UNUSED
4670 #endif
4671 )
4672 {
4673         struct mbuf *m, *m_last;
4674         struct sctp_nets *net;
4675         struct sctp_init_chunk *init;
4676         struct sctp_supported_addr_param *sup_addr;
4677         struct sctp_adaptation_layer_indication *ali;
4678         struct sctp_supported_chunk_types_param *pr_supported;
4679         struct sctp_paramhdr *ph;
4680         int cnt_inits_to = 0;
4681         int error;
4682         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4683
4684         /* INIT's always go to the primary (and usually ONLY address) */
4685         net = stcb->asoc.primary_destination;
4686         if (net == NULL) {
4687                 net = TAILQ_FIRST(&stcb->asoc.nets);
4688                 if (net == NULL) {
4689                         /* TSNH */
4690                         return;
4691                 }
4692                 /* we confirm any address we send an INIT to */
4693                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4694                 (void)sctp_set_primary_addr(stcb, NULL, net);
4695         } else {
4696                 /* we confirm any address we send an INIT to */
4697                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4698         }
4699         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4700 #ifdef INET6
4701         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4702                 /*
4703                  * special hook, if we are sending to link local it will not
4704                  * show up in our private address count.
4705                  */
4706                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4707                         cnt_inits_to = 1;
4708         }
4709 #endif
4710         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4711                 /* This case should not happen */
4712                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4713                 return;
4714         }
4715         /* start the INIT timer */
4716         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4717
4718         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4719         if (m == NULL) {
4720                 /* No memory, INIT timer will re-attempt. */
4721                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4722                 return;
4723         }
4724         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4725         padding_len = 0;
4726         /* Now lets put the chunk header in place */
4727         init = mtod(m, struct sctp_init_chunk *);
4728         /* now the chunk header */
4729         init->ch.chunk_type = SCTP_INITIATION;
4730         init->ch.chunk_flags = 0;
4731         /* fill in later from mbuf we build */
4732         init->ch.chunk_length = 0;
4733         /* place in my tag */
4734         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4735         /* set up some of the credits. */
4736         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4737             SCTP_MINIMAL_RWND));
4738         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4739         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4740         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4741
4742         /* Adaptation layer indication parameter */
4743         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4744                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4745                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4746                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4747                 ali->ph.param_length = htons(parameter_len);
4748                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4749                 chunk_len += parameter_len;
4750         }
4751         /* ECN parameter */
4752         if (stcb->asoc.ecn_supported == 1) {
4753                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4754                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4755                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4756                 ph->param_length = htons(parameter_len);
4757                 chunk_len += parameter_len;
4758         }
4759         /* PR-SCTP supported parameter */
4760         if (stcb->asoc.prsctp_supported == 1) {
4761                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4762                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4763                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4764                 ph->param_length = htons(parameter_len);
4765                 chunk_len += parameter_len;
4766         }
4767         /* Add NAT friendly parameter. */
4768         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4769                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4772                 ph->param_length = htons(parameter_len);
4773                 chunk_len += parameter_len;
4774         }
4775         /* And now tell the peer which extensions we support */
4776         num_ext = 0;
4777         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4778         if (stcb->asoc.prsctp_supported == 1) {
4779                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4780                 if (stcb->asoc.idata_supported) {
4781                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4782                 }
4783         }
4784         if (stcb->asoc.auth_supported == 1) {
4785                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4786         }
4787         if (stcb->asoc.asconf_supported == 1) {
4788                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4789                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4790         }
4791         if (stcb->asoc.reconfig_supported == 1) {
4792                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4793         }
4794         if (stcb->asoc.idata_supported) {
4795                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4796         }
4797         if (stcb->asoc.nrsack_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4799         }
4800         if (stcb->asoc.pktdrop_supported == 1) {
4801                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4802         }
4803         if (num_ext > 0) {
4804                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4805                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4806                 pr_supported->ph.param_length = htons(parameter_len);
4807                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4808                 chunk_len += parameter_len;
4809         }
4810         /* add authentication parameters */
4811         if (stcb->asoc.auth_supported) {
4812                 /* attach RANDOM parameter, if available */
4813                 if (stcb->asoc.authinfo.random != NULL) {
4814                         struct sctp_auth_random *randp;
4815
4816                         if (padding_len > 0) {
4817                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4818                                 chunk_len += padding_len;
4819                                 padding_len = 0;
4820                         }
4821                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4822                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4823                         /* random key already contains the header */
4824                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4825                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4826                         chunk_len += parameter_len;
4827                 }
4828                 /* add HMAC_ALGO parameter */
4829                 if (stcb->asoc.local_hmacs != NULL) {
4830                         struct sctp_auth_hmac_algo *hmacs;
4831
4832                         if (padding_len > 0) {
4833                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4834                                 chunk_len += padding_len;
4835                                 padding_len = 0;
4836                         }
4837                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4838                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4839                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4840                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4841                         hmacs->ph.param_length = htons(parameter_len);
4842                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4843                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4844                         chunk_len += parameter_len;
4845                 }
4846                 /* add CHUNKS parameter */
4847                 if (stcb->asoc.local_auth_chunks != NULL) {
4848                         struct sctp_auth_chunk_list *chunks;
4849
4850                         if (padding_len > 0) {
4851                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4852                                 chunk_len += padding_len;
4853                                 padding_len = 0;
4854                         }
4855                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4856                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4857                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4858                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4859                         chunks->ph.param_length = htons(parameter_len);
4860                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4861                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4862                         chunk_len += parameter_len;
4863                 }
4864         }
4865         /* now any cookie time extensions */
4866         if (stcb->asoc.cookie_preserve_req) {
4867                 struct sctp_cookie_perserve_param *cookie_preserve;
4868
4869                 if (padding_len > 0) {
4870                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871                         chunk_len += padding_len;
4872                         padding_len = 0;
4873                 }
4874                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4875                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4876                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4877                 cookie_preserve->ph.param_length = htons(parameter_len);
4878                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4879                 stcb->asoc.cookie_preserve_req = 0;
4880                 chunk_len += parameter_len;
4881         }
4882         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4883                 uint8_t i;
4884
4885                 if (padding_len > 0) {
4886                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4887                         chunk_len += padding_len;
4888                         padding_len = 0;
4889                 }
4890                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4891                 if (stcb->asoc.scope.ipv4_addr_legal) {
4892                         parameter_len += (uint16_t)sizeof(uint16_t);
4893                 }
4894                 if (stcb->asoc.scope.ipv6_addr_legal) {
4895                         parameter_len += (uint16_t)sizeof(uint16_t);
4896                 }
4897                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4898                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4899                 sup_addr->ph.param_length = htons(parameter_len);
4900                 i = 0;
4901                 if (stcb->asoc.scope.ipv4_addr_legal) {
4902                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4903                 }
4904                 if (stcb->asoc.scope.ipv6_addr_legal) {
4905                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4906                 }
4907                 padding_len = 4 - 2 * i;
4908                 chunk_len += parameter_len;
4909         }
4910         SCTP_BUF_LEN(m) = chunk_len;
4911         /* now the addresses */
4912         /*
4913          * To optimize this we could put the scoping stuff into a structure
4914          * and remove the individual uint8's from the assoc structure. Then
4915          * we could just sifa in the address within the stcb. But for now
4916          * this is a quick hack to get the address stuff teased apart.
4917          */
4918         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4919             m, cnt_inits_to,
4920             &padding_len, &chunk_len);
4921
4922         init->ch.chunk_length = htons(chunk_len);
4923         if (padding_len > 0) {
4924                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4925                         sctp_m_freem(m);
4926                         return;
4927                 }
4928         }
4929         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4930         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, int hold_inp_lock)
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 #ifdef INET
5502         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5503         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5504         struct sockaddr_in *sin;
5505 #endif
5506 #ifdef INET6
5507         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5508         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5509         struct sockaddr_in6 *sin6;
5510 #endif
5511         struct sockaddr *to;
5512         struct sctp_state_cookie stc;
5513         struct sctp_nets *net = NULL;
5514         uint8_t *signature = NULL;
5515         int cnt_inits_to = 0;
5516         uint16_t his_limit, i_want;
5517         int abort_flag;
5518         int nat_friendly = 0;
5519         int error;
5520         struct socket *so;
5521         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5522
5523         if (stcb) {
5524                 asoc = &stcb->asoc;
5525         } else {
5526                 asoc = NULL;
5527         }
5528         if ((asoc != NULL) &&
5529             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5530                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5531                         /*
5532                          * new addresses, out of here in non-cookie-wait
5533                          * states
5534                          *
5535                          * Send an ABORT, without the new address error
5536                          * cause. This looks no different than if no
5537                          * listener was present.
5538                          */
5539                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5540                             "Address added");
5541                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5542                             mflowtype, mflowid, inp->fibnum,
5543                             vrf_id, port);
5544                         return;
5545                 }
5546                 if (src_net != NULL && (src_net->port != port)) {
5547                         /*
5548                          * change of remote encapsulation port, out of here
5549                          * in non-cookie-wait states
5550                          *
5551                          * Send an ABORT, without an specific error cause.
5552                          * This looks no different than if no listener was
5553                          * present.
5554                          */
5555                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5556                             "Remote encapsulation port changed");
5557                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5558                             mflowtype, mflowid, inp->fibnum,
5559                             vrf_id, port);
5560                         return;
5561                 }
5562         }
5563         abort_flag = 0;
5564         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5565             (offset + sizeof(struct sctp_init_chunk)),
5566             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5567         if (abort_flag) {
5568 do_a_abort:
5569                 if (op_err == NULL) {
5570                         char msg[SCTP_DIAG_INFO_LEN];
5571
5572                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5573                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5574                             msg);
5575                 }
5576                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5577                     init_chk->init.initiate_tag, op_err,
5578                     mflowtype, mflowid, inp->fibnum,
5579                     vrf_id, port);
5580                 return;
5581         }
5582         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5583         if (m == NULL) {
5584                 /* No memory, INIT timer will re-attempt. */
5585                 if (op_err)
5586                         sctp_m_freem(op_err);
5587                 return;
5588         }
5589         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5590         padding_len = 0;
5591
5592         /*
5593          * We might not overwrite the identification[] completely and on
5594          * some platforms time_entered will contain some padding. Therefore
5595          * zero out the cookie to avoid putting uninitialized memory on the
5596          * wire.
5597          */
5598         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5599
5600         /* the time I built cookie */
5601         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5602
5603         /* populate any tie tags */
5604         if (asoc != NULL) {
5605                 /* unlock before tag selections */
5606                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5607                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5608                 stc.cookie_life = asoc->cookie_life;
5609                 net = asoc->primary_destination;
5610         } else {
5611                 stc.tie_tag_my_vtag = 0;
5612                 stc.tie_tag_peer_vtag = 0;
5613                 /* life I will award this cookie */
5614                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5615         }
5616
5617         /* copy in the ports for later check */
5618         stc.myport = sh->dest_port;
5619         stc.peerport = sh->src_port;
5620
5621         /*
5622          * If we wanted to honor cookie life extensions, we would add to
5623          * stc.cookie_life. For now we should NOT honor any extension
5624          */
5625         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5626         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5627                 stc.ipv6_addr_legal = 1;
5628                 if (SCTP_IPV6_V6ONLY(inp)) {
5629                         stc.ipv4_addr_legal = 0;
5630                 } else {
5631                         stc.ipv4_addr_legal = 1;
5632                 }
5633         } else {
5634                 stc.ipv6_addr_legal = 0;
5635                 stc.ipv4_addr_legal = 1;
5636         }
5637         stc.ipv4_scope = 0;
5638         if (net == NULL) {
5639                 to = src;
5640                 switch (dst->sa_family) {
5641 #ifdef INET
5642                 case AF_INET:
5643                         {
5644                                 /* lookup address */
5645                                 stc.address[0] = src4->sin_addr.s_addr;
5646                                 stc.address[1] = 0;
5647                                 stc.address[2] = 0;
5648                                 stc.address[3] = 0;
5649                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5650                                 /* local from address */
5651                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5652                                 stc.laddress[1] = 0;
5653                                 stc.laddress[2] = 0;
5654                                 stc.laddress[3] = 0;
5655                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5656                                 /* scope_id is only for v6 */
5657                                 stc.scope_id = 0;
5658                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5659                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5660                                         stc.ipv4_scope = 1;
5661                                 }
5662                                 /* Must use the address in this case */
5663                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5664                                         stc.loopback_scope = 1;
5665                                         stc.ipv4_scope = 1;
5666                                         stc.site_scope = 1;
5667                                         stc.local_scope = 0;
5668                                 }
5669                                 break;
5670                         }
5671 #endif
5672 #ifdef INET6
5673                 case AF_INET6:
5674                         {
5675                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5676                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5677                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5678                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5679                                         stc.loopback_scope = 1;
5680                                         stc.local_scope = 0;
5681                                         stc.site_scope = 1;
5682                                         stc.ipv4_scope = 1;
5683                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5684                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5685                                         /*
5686                                          * If the new destination or source
5687                                          * is a LINK_LOCAL we must have
5688                                          * common both site and local scope.
5689                                          * Don't set local scope though
5690                                          * since we must depend on the
5691                                          * source to be added implicitly. We
5692                                          * cannot assure just because we
5693                                          * share one link that all links are
5694                                          * common.
5695                                          */
5696                                         stc.local_scope = 0;
5697                                         stc.site_scope = 1;
5698                                         stc.ipv4_scope = 1;
5699                                         /*
5700                                          * we start counting for the private
5701                                          * address stuff at 1. since the
5702                                          * link local we source from won't
5703                                          * show up in our scoped count.
5704                                          */
5705                                         cnt_inits_to = 1;
5706                                         /*
5707                                          * pull out the scope_id from
5708                                          * incoming pkt
5709                                          */
5710                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5711                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5712                                         /*
5713                                          * If the new destination or source
5714                                          * is SITE_LOCAL then we must have
5715                                          * site scope in common.
5716                                          */
5717                                         stc.site_scope = 1;
5718                                 }
5719                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5720                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5721                                 break;
5722                         }
5723 #endif
5724                 default:
5725                         /* TSNH */
5726                         goto do_a_abort;
5727                         break;
5728                 }
5729         } else {
5730                 /* set the scope per the existing tcb */
5731
5732 #ifdef INET6
5733                 struct sctp_nets *lnet;
5734 #endif
5735
5736                 stc.loopback_scope = asoc->scope.loopback_scope;
5737                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5738                 stc.site_scope = asoc->scope.site_scope;
5739                 stc.local_scope = asoc->scope.local_scope;
5740 #ifdef INET6
5741                 /* Why do we not consider IPv4 LL addresses? */
5742                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5743                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5744                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5745                                         /*
5746                                          * if we have a LL address, start
5747                                          * counting at 1.
5748                                          */
5749                                         cnt_inits_to = 1;
5750                                 }
5751                         }
5752                 }
5753 #endif
5754                 /* use the net pointer */
5755                 to = (struct sockaddr *)&net->ro._l_addr;
5756                 switch (to->sa_family) {
5757 #ifdef INET
5758                 case AF_INET:
5759                         sin = (struct sockaddr_in *)to;
5760                         stc.address[0] = sin->sin_addr.s_addr;
5761                         stc.address[1] = 0;
5762                         stc.address[2] = 0;
5763                         stc.address[3] = 0;
5764                         stc.addr_type = SCTP_IPV4_ADDRESS;
5765                         if (net->src_addr_selected == 0) {
5766                                 /*
5767                                  * strange case here, the INIT should have
5768                                  * did the selection.
5769                                  */
5770                                 net->ro._s_addr = sctp_source_address_selection(inp,
5771                                     stcb, (sctp_route_t *)&net->ro,
5772                                     net, 0, vrf_id);
5773                                 if (net->ro._s_addr == NULL)
5774                                         return;
5775
5776                                 net->src_addr_selected = 1;
5777
5778                         }
5779                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5780                         stc.laddress[1] = 0;
5781                         stc.laddress[2] = 0;
5782                         stc.laddress[3] = 0;
5783                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5784                         /* scope_id is only for v6 */
5785                         stc.scope_id = 0;
5786                         break;
5787 #endif
5788 #ifdef INET6
5789                 case AF_INET6:
5790                         sin6 = (struct sockaddr_in6 *)to;
5791                         memcpy(&stc.address, &sin6->sin6_addr,
5792                             sizeof(struct in6_addr));
5793                         stc.addr_type = SCTP_IPV6_ADDRESS;
5794                         stc.scope_id = sin6->sin6_scope_id;
5795                         if (net->src_addr_selected == 0) {
5796                                 /*
5797                                  * strange case here, the INIT should have
5798                                  * done the selection.
5799                                  */
5800                                 net->ro._s_addr = sctp_source_address_selection(inp,
5801                                     stcb, (sctp_route_t *)&net->ro,
5802                                     net, 0, vrf_id);
5803                                 if (net->ro._s_addr == NULL)
5804                                         return;
5805
5806                                 net->src_addr_selected = 1;
5807                         }
5808                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5809                             sizeof(struct in6_addr));
5810                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5811                         break;
5812 #endif
5813                 }
5814         }
5815         /* Now lets put the SCTP header in place */
5816         initack = mtod(m, struct sctp_init_ack_chunk *);
5817         /* Save it off for quick ref */
5818         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5819         /* who are we */
5820         memcpy(stc.identification, SCTP_VERSION_STRING,
5821             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5822         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5823         /* now the chunk header */
5824         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5825         initack->ch.chunk_flags = 0;
5826         /* fill in later from mbuf we build */
5827         initack->ch.chunk_length = 0;
5828         /* place in my tag */
5829         if ((asoc != NULL) &&
5830             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5831             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5832             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5833                 /* re-use the v-tags and init-seq here */
5834                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5835                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5836         } else {
5837                 uint32_t vtag, itsn;
5838
5839                 if (hold_inp_lock) {
5840                         SCTP_INP_INCR_REF(inp);
5841                         SCTP_INP_RUNLOCK(inp);
5842                 }
5843                 if (asoc) {
5844                         atomic_add_int(&asoc->refcnt, 1);
5845                         SCTP_TCB_UNLOCK(stcb);
5846         new_tag:
5847                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5848                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5849                                 /*
5850                                  * Got a duplicate vtag on some guy behind a
5851                                  * nat make sure we don't use it.
5852                                  */
5853                                 goto new_tag;
5854                         }
5855                         initack->init.initiate_tag = htonl(vtag);
5856                         /* get a TSN to use too */
5857                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5858                         initack->init.initial_tsn = htonl(itsn);
5859                         SCTP_TCB_LOCK(stcb);
5860                         atomic_add_int(&asoc->refcnt, -1);
5861                 } else {
5862                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5863                         initack->init.initiate_tag = htonl(vtag);
5864                         /* get a TSN to use too */
5865                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5866                 }
5867                 if (hold_inp_lock) {
5868                         SCTP_INP_RLOCK(inp);
5869                         SCTP_INP_DECR_REF(inp);
5870                 }
5871         }
5872         /* save away my tag to */
5873         stc.my_vtag = initack->init.initiate_tag;
5874
5875         /* set up some of the credits. */
5876         so = inp->sctp_socket;
5877         if (so == NULL) {
5878                 /* memory problem */
5879                 sctp_m_freem(m);
5880                 return;
5881         } else {
5882                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5883         }
5884         /* set what I want */
5885         his_limit = ntohs(init_chk->init.num_inbound_streams);
5886         /* choose what I want */
5887         if (asoc != NULL) {
5888                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5889                         i_want = asoc->streamoutcnt;
5890                 } else {
5891                         i_want = asoc->pre_open_streams;
5892                 }
5893         } else {
5894                 i_want = inp->sctp_ep.pre_open_stream_count;
5895         }
5896         if (his_limit < i_want) {
5897                 /* I Want more :< */
5898                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5899         } else {
5900                 /* I can have what I want :> */
5901                 initack->init.num_outbound_streams = htons(i_want);
5902         }
5903         /* tell him his limit. */
5904         initack->init.num_inbound_streams =
5905             htons(inp->sctp_ep.max_open_streams_intome);
5906
5907         /* adaptation layer indication parameter */
5908         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5909                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5910                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5911                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5912                 ali->ph.param_length = htons(parameter_len);
5913                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5914                 chunk_len += parameter_len;
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         /* PR-SCTP supported parameter */
5926         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5927             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5928                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5929                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5930                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5931                 ph->param_length = htons(parameter_len);
5932                 chunk_len += parameter_len;
5933         }
5934         /* Add NAT friendly parameter */
5935         if (nat_friendly) {
5936                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5937                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5938                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5939                 ph->param_length = htons(parameter_len);
5940                 chunk_len += parameter_len;
5941         }
5942         /* And now tell the peer which extensions we support */
5943         num_ext = 0;
5944         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5945         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5946             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5947                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5948                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5949                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5950                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5951                 }
5952         }
5953         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5954             ((asoc == NULL) && (inp->auth_supported == 1))) {
5955                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5956         }
5957         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5958             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5959                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5960                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5961         }
5962         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5963             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5964                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5965         }
5966         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5967             ((asoc == NULL) && (inp->idata_supported == 1))) {
5968                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5969         }
5970         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5971             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5973         }
5974         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5975             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5976                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5977         }
5978         if (num_ext > 0) {
5979                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5980                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5981                 pr_supported->ph.param_length = htons(parameter_len);
5982                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5983                 chunk_len += parameter_len;
5984         }
5985         /* add authentication parameters */
5986         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5987             ((asoc == NULL) && (inp->auth_supported == 1))) {
5988                 struct sctp_auth_random *randp;
5989                 struct sctp_auth_hmac_algo *hmacs;
5990                 struct sctp_auth_chunk_list *chunks;
5991
5992                 if (padding_len > 0) {
5993                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5994                         chunk_len += padding_len;
5995                         padding_len = 0;
5996                 }
5997                 /* generate and add RANDOM parameter */
5998                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5999                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6000                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6001                 randp->ph.param_type = htons(SCTP_RANDOM);
6002                 randp->ph.param_length = htons(parameter_len);
6003                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6004                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6005                 chunk_len += parameter_len;
6006
6007                 if (padding_len > 0) {
6008                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6009                         chunk_len += padding_len;
6010                         padding_len = 0;
6011                 }
6012                 /* add HMAC_ALGO parameter */
6013                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6014                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6015                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6016                     (uint8_t *)hmacs->hmac_ids);
6017                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6018                 hmacs->ph.param_length = htons(parameter_len);
6019                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6020                 chunk_len += parameter_len;
6021
6022                 if (padding_len > 0) {
6023                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6024                         chunk_len += padding_len;
6025                         padding_len = 0;
6026                 }
6027                 /* add CHUNKS parameter */
6028                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6029                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6030                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6031                     chunks->chunk_types);
6032                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6033                 chunks->ph.param_length = htons(parameter_len);
6034                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6035                 chunk_len += parameter_len;
6036         }
6037         SCTP_BUF_LEN(m) = chunk_len;
6038         m_last = m;
6039         /* now the addresses */
6040         /*
6041          * To optimize this we could put the scoping stuff into a structure
6042          * and remove the individual uint8's from the stc structure. Then we
6043          * could just sifa in the address within the stc.. but for now this
6044          * is a quick hack to get the address stuff teased apart.
6045          */
6046         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6047         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6048         scp.loopback_scope = stc.loopback_scope;
6049         scp.ipv4_local_scope = stc.ipv4_scope;
6050         scp.local_scope = stc.local_scope;
6051         scp.site_scope = stc.site_scope;
6052         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6053             cnt_inits_to,
6054             &padding_len, &chunk_len);
6055         /* padding_len can only be positive, if no addresses have been added */
6056         if (padding_len > 0) {
6057                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6058                 chunk_len += padding_len;
6059                 SCTP_BUF_LEN(m) += padding_len;
6060                 padding_len = 0;
6061         }
6062         /* tack on the operational error if present */
6063         if (op_err) {
6064                 parameter_len = 0;
6065                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6066                         parameter_len += SCTP_BUF_LEN(m_tmp);
6067                 }
6068                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6069                 SCTP_BUF_NEXT(m_last) = op_err;
6070                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6071                         m_last = SCTP_BUF_NEXT(m_last);
6072                 }
6073                 chunk_len += parameter_len;
6074         }
6075         if (padding_len > 0) {
6076                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6077                 if (m_last == NULL) {
6078                         /* Houston we have a problem, no space */
6079                         sctp_m_freem(m);
6080                         return;
6081                 }
6082                 chunk_len += padding_len;
6083                 padding_len = 0;
6084         }
6085         /* Now we must build a cookie */
6086         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6087         if (m_cookie == NULL) {
6088                 /* memory problem */
6089                 sctp_m_freem(m);
6090                 return;
6091         }
6092         /* Now append the cookie to the end and update the space/size */
6093         SCTP_BUF_NEXT(m_last) = m_cookie;
6094         parameter_len = 0;
6095         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6096                 parameter_len += SCTP_BUF_LEN(m_tmp);
6097                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6098                         m_last = m_tmp;
6099                 }
6100         }
6101         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6102         chunk_len += parameter_len;
6103
6104         /*
6105          * Place in the size, but we don't include the last pad (if any) in
6106          * the INIT-ACK.
6107          */
6108         initack->ch.chunk_length = htons(chunk_len);
6109
6110         /*
6111          * Time to sign the cookie, we don't sign over the cookie signature
6112          * though thus we set trailer.
6113          */
6114         (void)sctp_hmac_m(SCTP_HMAC,
6115             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6116             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6117             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6118         /*
6119          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6120          * here since the timer will drive a retranmission.
6121          */
6122         if (padding_len > 0) {
6123                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6124                         sctp_m_freem(m);
6125                         return;
6126                 }
6127         }
6128         if (stc.loopback_scope) {
6129                 over_addr = (union sctp_sockstore *)dst;
6130         } else {
6131                 over_addr = NULL;
6132         }
6133
6134         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6135             0, 0,
6136             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6137             port, over_addr,
6138             mflowtype, mflowid,
6139             SCTP_SO_NOT_LOCKED))) {
6140                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6141                 if (error == ENOBUFS) {
6142                         if (asoc != NULL) {
6143                                 asoc->ifp_had_enobuf = 1;
6144                         }
6145                         SCTP_STAT_INCR(sctps_lowlevelerr);
6146                 }
6147         } else {
6148                 if (asoc != NULL) {
6149                         asoc->ifp_had_enobuf = 0;
6150                 }
6151         }
6152         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6153 }
6154
6155
6156 static void
6157 sctp_prune_prsctp(struct sctp_tcb *stcb,
6158     struct sctp_association *asoc,
6159     struct sctp_sndrcvinfo *srcv,
6160     int dataout)
6161 {
6162         int freed_spc = 0;
6163         struct sctp_tmit_chunk *chk, *nchk;
6164
6165         SCTP_TCB_LOCK_ASSERT(stcb);
6166         if ((asoc->prsctp_supported) &&
6167             (asoc->sent_queue_cnt_removeable > 0)) {
6168                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6169                         /*
6170                          * Look for chunks marked with the PR_SCTP flag AND
6171                          * the buffer space flag. If the one being sent is
6172                          * equal or greater priority then purge the old one
6173                          * and free some space.
6174                          */
6175                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6176                                 /*
6177                                  * This one is PR-SCTP AND buffer space
6178                                  * limited type
6179                                  */
6180                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6181                                         /*
6182                                          * Lower numbers equates to higher
6183                                          * priority so if the one we are
6184                                          * looking at has a larger or equal
6185                                          * priority we want to drop the data
6186                                          * and NOT retransmit it.
6187                                          */
6188                                         if (chk->data) {
6189                                                 /*
6190                                                  * We release the book_size
6191                                                  * if the mbuf is here
6192                                                  */
6193                                                 int ret_spc;
6194                                                 uint8_t sent;
6195
6196                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6197                                                         sent = 1;
6198                                                 else
6199                                                         sent = 0;
6200                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6201                                                     sent,
6202                                                     SCTP_SO_LOCKED);
6203                                                 freed_spc += ret_spc;
6204                                                 if (freed_spc >= dataout) {
6205                                                         return;
6206                                                 }
6207                                         }       /* if chunk was present */
6208                                 }       /* if of sufficient priority */
6209                         }       /* if chunk has enabled */
6210                 }               /* tailqforeach */
6211
6212                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6213                         /* Here we must move to the sent queue and mark */
6214                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6215                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6216                                         if (chk->data) {
6217                                                 /*
6218                                                  * We release the book_size
6219                                                  * if the mbuf is here
6220                                                  */
6221                                                 int ret_spc;
6222
6223                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6224                                                     0, SCTP_SO_LOCKED);
6225
6226                                                 freed_spc += ret_spc;
6227                                                 if (freed_spc >= dataout) {
6228                                                         return;
6229                                                 }
6230                                         }       /* end if chk->data */
6231                                 }       /* end if right class */
6232                         }       /* end if chk pr-sctp */
6233                 }               /* tailqforeachsafe (chk) */
6234         }                       /* if enabled in asoc */
6235 }
6236
6237 int
6238 sctp_get_frag_point(struct sctp_tcb *stcb,
6239     struct sctp_association *asoc)
6240 {
6241         int siz, ovh;
6242
6243         /*
6244          * For endpoints that have both v6 and v4 addresses we must reserve
6245          * room for the ipv6 header, for those that are only dealing with V4
6246          * we use a larger frag point.
6247          */
6248         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6249                 ovh = SCTP_MIN_OVERHEAD;
6250         } else {
6251                 ovh = SCTP_MIN_V4_OVERHEAD;
6252         }
6253         if (stcb->asoc.idata_supported) {
6254                 ovh += sizeof(struct sctp_idata_chunk);
6255         } else {
6256                 ovh += sizeof(struct sctp_data_chunk);
6257         }
6258         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6259                 siz = asoc->smallest_mtu - ovh;
6260         else
6261                 siz = (stcb->asoc.sctp_frag_point - ovh);
6262         /*
6263          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6264          */
6265         /* A data chunk MUST fit in a cluster */
6266         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6267         /* } */
6268
6269         /* adjust for an AUTH chunk if DATA requires auth */
6270         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6271                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6272
6273         if (siz % 4) {
6274                 /* make it an even word boundary please */
6275                 siz -= (siz % 4);
6276         }
6277         return (siz);
6278 }
6279
6280 static void
6281 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6282 {
6283         /*
6284          * We assume that the user wants PR_SCTP_TTL if the user provides a
6285          * positive lifetime but does not specify any PR_SCTP policy.
6286          */
6287         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6288                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6289         } else if (sp->timetolive > 0) {
6290                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6291                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6292         } else {
6293                 return;
6294         }
6295         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6296         case CHUNK_FLAGS_PR_SCTP_BUF:
6297                 /*
6298                  * Time to live is a priority stored in tv_sec when doing
6299                  * the buffer drop thing.
6300                  */
6301                 sp->ts.tv_sec = sp->timetolive;
6302                 sp->ts.tv_usec = 0;
6303                 break;
6304         case CHUNK_FLAGS_PR_SCTP_TTL:
6305                 {
6306                         struct timeval tv;
6307
6308                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6309                         tv.tv_sec = sp->timetolive / 1000;
6310                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6311                         /*
6312                          * TODO sctp_constants.h needs alternative time
6313                          * macros when _KERNEL is undefined.
6314                          */
6315                         timevaladd(&sp->ts, &tv);
6316                 }
6317                 break;
6318         case CHUNK_FLAGS_PR_SCTP_RTX:
6319                 /*
6320                  * Time to live is a the number or retransmissions stored in
6321                  * tv_sec.
6322                  */
6323                 sp->ts.tv_sec = sp->timetolive;
6324                 sp->ts.tv_usec = 0;
6325                 break;
6326         default:
6327                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6328                     "Unknown PR_SCTP policy %u.\n",
6329                     PR_SCTP_POLICY(sp->sinfo_flags));
6330                 break;
6331         }
6332 }
6333
6334 static int
6335 sctp_msg_append(struct sctp_tcb *stcb,
6336     struct sctp_nets *net,
6337     struct mbuf *m,
6338     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6339 {
6340         int error = 0;
6341         struct mbuf *at;
6342         struct sctp_stream_queue_pending *sp = NULL;
6343         struct sctp_stream_out *strm;
6344
6345         /*
6346          * Given an mbuf chain, put it into the association send queue and
6347          * place it on the wheel
6348          */
6349         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6350                 /* Invalid stream number */
6351                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6352                 error = EINVAL;
6353                 goto out_now;
6354         }
6355         if ((stcb->asoc.stream_locked) &&
6356             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6357                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6358                 error = EINVAL;
6359                 goto out_now;
6360         }
6361         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6362         /* Now can we send this? */
6363         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6364             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6365             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6366             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6367                 /* got data while shutting down */
6368                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6369                 error = ECONNRESET;
6370                 goto out_now;
6371         }
6372         sctp_alloc_a_strmoq(stcb, sp);
6373         if (sp == NULL) {
6374                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6375                 error = ENOMEM;
6376                 goto out_now;
6377         }
6378         sp->sinfo_flags = srcv->sinfo_flags;
6379         sp->timetolive = srcv->sinfo_timetolive;
6380         sp->ppid = srcv->sinfo_ppid;
6381         sp->context = srcv->sinfo_context;
6382         sp->fsn = 0;
6383         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6384                 sp->net = net;
6385                 atomic_add_int(&sp->net->ref_count, 1);
6386         } else {
6387                 sp->net = NULL;
6388         }
6389         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6390         sp->sid = srcv->sinfo_stream;
6391         sp->msg_is_complete = 1;
6392         sp->sender_all_done = 1;
6393         sp->some_taken = 0;
6394         sp->data = m;
6395         sp->tail_mbuf = NULL;
6396         sctp_set_prsctp_policy(sp);
6397         /*
6398          * We could in theory (for sendall) sifa the length in, but we would
6399          * still have to hunt through the chain since we need to setup the
6400          * tail_mbuf
6401          */
6402         sp->length = 0;
6403         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6404                 if (SCTP_BUF_NEXT(at) == NULL)
6405                         sp->tail_mbuf = at;
6406                 sp->length += SCTP_BUF_LEN(at);
6407         }
6408         if (srcv->sinfo_keynumber_valid) {
6409                 sp->auth_keyid = srcv->sinfo_keynumber;
6410         } else {
6411                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6412         }
6413         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6414                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6415                 sp->holds_key_ref = 1;
6416         }
6417         if (hold_stcb_lock == 0) {
6418                 SCTP_TCB_SEND_LOCK(stcb);
6419         }
6420         sctp_snd_sb_alloc(stcb, sp->length);
6421         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6422         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6423         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6424         m = NULL;
6425         if (hold_stcb_lock == 0) {
6426                 SCTP_TCB_SEND_UNLOCK(stcb);
6427         }
6428 out_now:
6429         if (m) {
6430                 sctp_m_freem(m);
6431         }
6432         return (error);
6433 }
6434
6435
6436 static struct mbuf *
6437 sctp_copy_mbufchain(struct mbuf *clonechain,
6438     struct mbuf *outchain,
6439     struct mbuf **endofchain,
6440     int can_take_mbuf,
6441     int sizeofcpy,
6442     uint8_t copy_by_ref)
6443 {
6444         struct mbuf *m;
6445         struct mbuf *appendchain;
6446         caddr_t cp;
6447         int len;
6448
6449         if (endofchain == NULL) {
6450                 /* error */
6451 error_out:
6452                 if (outchain)
6453                         sctp_m_freem(outchain);
6454                 return (NULL);
6455         }
6456         if (can_take_mbuf) {
6457                 appendchain = clonechain;
6458         } else {
6459                 if (!copy_by_ref &&
6460                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6461                     ) {
6462                         /* Its not in a cluster */
6463                         if (*endofchain == NULL) {
6464                                 /* lets get a mbuf cluster */
6465                                 if (outchain == NULL) {
6466                                         /* This is the general case */
6467                         new_mbuf:
6468                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6469                                         if (outchain == NULL) {
6470                                                 goto error_out;
6471                                         }
6472                                         SCTP_BUF_LEN(outchain) = 0;
6473                                         *endofchain = outchain;
6474                                         /* get the prepend space */
6475                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6476                                 } else {
6477                                         /*
6478                                          * We really should not get a NULL
6479                                          * in endofchain
6480                                          */
6481                                         /* find end */
6482                                         m = outchain;
6483                                         while (m) {
6484                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6485                                                         *endofchain = m;
6486                                                         break;
6487                                                 }
6488                                                 m = SCTP_BUF_NEXT(m);
6489                                         }
6490                                         /* sanity */
6491                                         if (*endofchain == NULL) {
6492                                                 /*
6493                                                  * huh, TSNH XXX maybe we
6494                                                  * should panic
6495                                                  */
6496                                                 sctp_m_freem(outchain);
6497                                                 goto new_mbuf;
6498                                         }
6499                                 }
6500                                 /* get the new end of length */
6501                                 len = (int)M_TRAILINGSPACE(*endofchain);
6502                         } else {
6503                                 /* how much is left at the end? */
6504                                 len = (int)M_TRAILINGSPACE(*endofchain);
6505                         }
6506                         /* Find the end of the data, for appending */
6507                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6508
6509                         /* Now lets copy it out */
6510                         if (len >= sizeofcpy) {
6511                                 /* It all fits, copy it in */
6512                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6513                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6514                         } else {
6515                                 /* fill up the end of the chain */
6516                                 if (len > 0) {
6517                                         m_copydata(clonechain, 0, len, cp);
6518                                         SCTP_BUF_LEN((*endofchain)) += len;
6519                                         /* now we need another one */
6520                                         sizeofcpy -= len;
6521                                 }
6522                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6523                                 if (m == NULL) {
6524                                         /* We failed */
6525                                         goto error_out;
6526                                 }
6527                                 SCTP_BUF_NEXT((*endofchain)) = m;
6528                                 *endofchain = m;
6529                                 cp = mtod((*endofchain), caddr_t);
6530                                 m_copydata(clonechain, len, sizeofcpy, cp);
6531                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6532                         }
6533                         return (outchain);
6534                 } else {
6535                         /* copy the old fashion way */
6536                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6537 #ifdef SCTP_MBUF_LOGGING
6538                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6539                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6540                         }
6541 #endif
6542                 }
6543         }
6544         if (appendchain == NULL) {
6545                 /* error */
6546                 if (outchain)
6547                         sctp_m_freem(outchain);
6548                 return (NULL);
6549         }
6550         if (outchain) {
6551                 /* tack on to the end */
6552                 if (*endofchain != NULL) {
6553                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6554                 } else {
6555                         m = outchain;
6556                         while (m) {
6557                                 if (SCTP_BUF_NEXT(m) == NULL) {
6558                                         SCTP_BUF_NEXT(m) = appendchain;
6559                                         break;
6560                                 }
6561                                 m = SCTP_BUF_NEXT(m);
6562                         }
6563                 }
6564                 /*
6565                  * save off the end and update the end-chain position
6566                  */
6567                 m = appendchain;
6568                 while (m) {
6569                         if (SCTP_BUF_NEXT(m) == NULL) {
6570                                 *endofchain = m;
6571                                 break;
6572                         }
6573                         m = SCTP_BUF_NEXT(m);
6574                 }
6575                 return (outchain);
6576         } else {
6577                 /* save off the end and update the end-chain position */
6578                 m = appendchain;
6579                 while (m) {
6580                         if (SCTP_BUF_NEXT(m) == NULL) {
6581                                 *endofchain = m;
6582                                 break;
6583                         }
6584                         m = SCTP_BUF_NEXT(m);
6585                 }
6586                 return (appendchain);
6587         }
6588 }
6589
6590 static int
6591 sctp_med_chunk_output(struct sctp_inpcb *inp,
6592     struct sctp_tcb *stcb,
6593     struct sctp_association *asoc,
6594     int *num_out,
6595     int *reason_code,
6596     int control_only, int from_where,
6597     struct timeval *now, int *now_filled, int frag_point, int so_locked
6598 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6599     SCTP_UNUSED
6600 #endif
6601 );
6602
6603 static void
6604 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6605     uint32_t val SCTP_UNUSED)
6606 {
6607         struct sctp_copy_all *ca;
6608         struct mbuf *m;
6609         int ret = 0;
6610         int added_control = 0;
6611         int un_sent, do_chunk_output = 1;
6612         struct sctp_association *asoc;
6613         struct sctp_nets *net;
6614
6615         ca = (struct sctp_copy_all *)ptr;
6616         if (ca->m == NULL) {
6617                 return;
6618         }
6619         if (ca->inp != inp) {
6620                 /* TSNH */
6621                 return;
6622         }
6623         if (ca->sndlen > 0) {
6624                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6625                 if (m == NULL) {
6626                         /* can't copy so we are done */
6627                         ca->cnt_failed++;
6628                         return;
6629                 }
6630 #ifdef SCTP_MBUF_LOGGING
6631                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6632                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6633                 }
6634 #endif
6635         } else {
6636                 m = NULL;
6637         }
6638         SCTP_TCB_LOCK_ASSERT(stcb);
6639         if (stcb->asoc.alternate) {
6640                 net = stcb->asoc.alternate;
6641         } else {
6642                 net = stcb->asoc.primary_destination;
6643         }
6644         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6645                 /* Abort this assoc with m as the user defined reason */
6646                 if (m != NULL) {
6647                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6648                 } else {
6649                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6650                             0, M_NOWAIT, 1, MT_DATA);
6651                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6652                 }
6653                 if (m != NULL) {
6654                         struct sctp_paramhdr *ph;
6655
6656                         ph = mtod(m, struct sctp_paramhdr *);
6657                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6658                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6659                 }
6660                 /*
6661                  * We add one here to keep the assoc from dis-appearing on
6662                  * us.
6663                  */
6664                 atomic_add_int(&stcb->asoc.refcnt, 1);
6665                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6666                 /*
6667                  * sctp_abort_an_association calls sctp_free_asoc() free
6668                  * association will NOT free it since we incremented the
6669                  * refcnt .. we do this to prevent it being freed and things
6670                  * getting tricky since we could end up (from free_asoc)
6671                  * calling inpcb_free which would get a recursive lock call
6672                  * to the iterator lock.. But as a consequence of that the
6673                  * stcb will return to us un-locked.. since free_asoc
6674                  * returns with either no TCB or the TCB unlocked, we must
6675                  * relock.. to unlock in the iterator timer :-0
6676                  */
6677                 SCTP_TCB_LOCK(stcb);
6678                 atomic_add_int(&stcb->asoc.refcnt, -1);
6679                 goto no_chunk_output;
6680         } else {
6681                 if (m) {
6682                         ret = sctp_msg_append(stcb, net, m,
6683                             &ca->sndrcv, 1);
6684                 }
6685                 asoc = &stcb->asoc;
6686                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6687                         /* shutdown this assoc */
6688                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6689                             TAILQ_EMPTY(&asoc->sent_queue) &&
6690                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6691                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6692                                         goto abort_anyway;
6693                                 }
6694                                 /*
6695                                  * there is nothing queued to send, so I'm
6696                                  * done...
6697                                  */
6698                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6699                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6700                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6701                                         /*
6702                                          * only send SHUTDOWN the first time
6703                                          * through
6704                                          */
6705                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6706                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6707                                         }
6708                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6709                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6710                                         sctp_stop_timers_for_shutdown(stcb);
6711                                         sctp_send_shutdown(stcb, net);
6712                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6713                                             net);
6714                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6715                                             asoc->primary_destination);
6716                                         added_control = 1;
6717                                         do_chunk_output = 0;
6718                                 }
6719                         } else {
6720                                 /*
6721                                  * we still got (or just got) data to send,
6722                                  * so set SHUTDOWN_PENDING
6723                                  */
6724                                 /*
6725                                  * XXX sockets draft says that SCTP_EOF
6726                                  * should be sent with no data.  currently,
6727                                  * we will allow user data to be sent first
6728                                  * and move to SHUTDOWN-PENDING
6729                                  */
6730                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6731                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6732                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6733                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6734                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6735                                         }
6736                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6737                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6738                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6739                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6740                                                 struct mbuf *op_err;
6741                                                 char msg[SCTP_DIAG_INFO_LEN];
6742
6743                                 abort_anyway:
6744                                                 snprintf(msg, sizeof(msg),
6745                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6746                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6747                                                     msg);
6748                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6749                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6750                                                     op_err, SCTP_SO_NOT_LOCKED);
6751                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6752                                                 goto no_chunk_output;
6753                                         }
6754                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6755                                             asoc->primary_destination);
6756                                 }
6757                         }
6758
6759                 }
6760         }
6761         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6762             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6763
6764         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6765             (stcb->asoc.total_flight > 0) &&
6766             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6767                 do_chunk_output = 0;
6768         }
6769         if (do_chunk_output)
6770                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6771         else if (added_control) {
6772                 int num_out, reason, now_filled = 0;
6773                 struct timeval now;
6774                 int frag_point;
6775
6776                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6777                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6778                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6779         }
6780 no_chunk_output:
6781         if (ret) {
6782                 ca->cnt_failed++;
6783         } else {
6784                 ca->cnt_sent++;
6785         }
6786 }
6787
6788 static void
6789 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6790 {
6791         struct sctp_copy_all *ca;
6792
6793         ca = (struct sctp_copy_all *)ptr;
6794         /*
6795          * Do a notify here? Kacheong suggests that the notify be done at
6796          * the send time.. so you would push up a notification if any send
6797          * failed. Don't know if this is feasible since the only failures we
6798          * have is "memory" related and if you cannot get an mbuf to send
6799          * the data you surely can't get an mbuf to send up to notify the
6800          * user you can't send the data :->
6801          */
6802
6803         /* now free everything */
6804         sctp_m_freem(ca->m);
6805         SCTP_FREE(ca, SCTP_M_COPYAL);
6806 }
6807
6808 static struct mbuf *
6809 sctp_copy_out_all(struct uio *uio, int len)
6810 {
6811         struct mbuf *ret, *at;
6812         int left, willcpy, cancpy, error;
6813
6814         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6815         if (ret == NULL) {
6816                 /* TSNH */
6817                 return (NULL);
6818         }
6819         left = len;
6820         SCTP_BUF_LEN(ret) = 0;
6821         /* save space for the data chunk header */
6822         cancpy = (int)M_TRAILINGSPACE(ret);
6823         willcpy = min(cancpy, left);
6824         at = ret;
6825         while (left > 0) {
6826                 /* Align data to the end */
6827                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6828                 if (error) {
6829         err_out_now:
6830                         sctp_m_freem(at);
6831                         return (NULL);
6832                 }
6833                 SCTP_BUF_LEN(at) = willcpy;
6834                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6835                 left -= willcpy;
6836                 if (left > 0) {
6837                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6838                         if (SCTP_BUF_NEXT(at) == NULL) {
6839                                 goto err_out_now;
6840                         }
6841                         at = SCTP_BUF_NEXT(at);
6842                         SCTP_BUF_LEN(at) = 0;
6843                         cancpy = (int)M_TRAILINGSPACE(at);
6844                         willcpy = min(cancpy, left);
6845                 }
6846         }
6847         return (ret);
6848 }
6849
6850 static int
6851 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6852     struct sctp_sndrcvinfo *srcv)
6853 {
6854         int ret;
6855         struct sctp_copy_all *ca;
6856
6857         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6858             SCTP_M_COPYAL);
6859         if (ca == NULL) {
6860                 sctp_m_freem(m);
6861                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6862                 return (ENOMEM);
6863         }
6864         memset(ca, 0, sizeof(struct sctp_copy_all));
6865
6866         ca->inp = inp;
6867         if (srcv) {
6868                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6869         }
6870         /*
6871          * take off the sendall flag, it would be bad if we failed to do
6872          * this :-0
6873          */
6874         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6875         /* get length and mbuf chain */
6876         if (uio) {
6877                 ca->sndlen = (int)uio->uio_resid;
6878                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6879                 if (ca->m == NULL) {
6880                         SCTP_FREE(ca, SCTP_M_COPYAL);
6881                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6882                         return (ENOMEM);
6883                 }
6884         } else {
6885                 /* Gather the length of the send */
6886                 struct mbuf *mat;
6887
6888                 ca->sndlen = 0;
6889                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6890                         ca->sndlen += SCTP_BUF_LEN(mat);
6891                 }
6892         }
6893         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6894             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6895             SCTP_ASOC_ANY_STATE,
6896             (void *)ca, 0,
6897             sctp_sendall_completes, inp, 1);
6898         if (ret) {
6899                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6900                 SCTP_FREE(ca, SCTP_M_COPYAL);
6901                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6902                 return (EFAULT);
6903         }
6904         return (0);
6905 }
6906
6907
6908 void
6909 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6910 {
6911         struct sctp_tmit_chunk *chk, *nchk;
6912
6913         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6914                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6915                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6916                         if (chk->data) {
6917                                 sctp_m_freem(chk->data);
6918                                 chk->data = NULL;
6919                         }
6920                         asoc->ctrl_queue_cnt--;
6921                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6922                 }
6923         }
6924 }
6925
6926 void
6927 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6928 {
6929         struct sctp_association *asoc;
6930         struct sctp_tmit_chunk *chk, *nchk;
6931         struct sctp_asconf_chunk *acp;
6932
6933         asoc = &stcb->asoc;
6934         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6935                 /* find SCTP_ASCONF chunk in queue */
6936                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6937                         if (chk->data) {
6938                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6939                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6940                                         /* Not Acked yet */
6941                                         break;
6942                                 }
6943                         }
6944                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6945                         if (chk->data) {
6946                                 sctp_m_freem(chk->data);
6947                                 chk->data = NULL;
6948                         }
6949                         asoc->ctrl_queue_cnt--;
6950                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6951                 }
6952         }
6953 }
6954
6955
6956 static void
6957 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6958     struct sctp_association *asoc,
6959     struct sctp_tmit_chunk **data_list,
6960     int bundle_at,
6961     struct sctp_nets *net)
6962 {
6963         int i;
6964         struct sctp_tmit_chunk *tp1;
6965
6966         for (i = 0; i < bundle_at; i++) {
6967                 /* off of the send queue */
6968                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6969                 asoc->send_queue_cnt--;
6970                 if (i > 0) {
6971                         /*
6972                          * Any chunk NOT 0 you zap the time chunk 0 gets
6973                          * zapped or set based on if a RTO measurment is
6974                          * needed.
6975                          */
6976                         data_list[i]->do_rtt = 0;
6977                 }
6978                 /* record time */
6979                 data_list[i]->sent_rcv_time = net->last_sent_time;
6980                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6981                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6982                 if (data_list[i]->whoTo == NULL) {
6983                         data_list[i]->whoTo = net;
6984                         atomic_add_int(&net->ref_count, 1);
6985                 }
6986                 /* on to the sent queue */
6987                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6988                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6989                         struct sctp_tmit_chunk *tpp;
6990
6991                         /* need to move back */
6992         back_up_more:
6993                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6994                         if (tpp == NULL) {
6995                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6996                                 goto all_done;
6997                         }
6998                         tp1 = tpp;
6999                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7000                                 goto back_up_more;
7001                         }
7002                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7003                 } else {
7004                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7005                             data_list[i],
7006                             sctp_next);
7007                 }
7008 all_done:
7009                 /* This does not lower until the cum-ack passes it */
7010                 asoc->sent_queue_cnt++;
7011                 if ((asoc->peers_rwnd <= 0) &&
7012                     (asoc->total_flight == 0) &&
7013                     (bundle_at == 1)) {
7014                         /* Mark the chunk as being a window probe */
7015                         SCTP_STAT_INCR(sctps_windowprobed);
7016                 }
7017 #ifdef SCTP_AUDITING_ENABLED
7018                 sctp_audit_log(0xC2, 3);
7019 #endif
7020                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7021                 data_list[i]->snd_count = 1;
7022                 data_list[i]->rec.data.chunk_was_revoked = 0;
7023                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7024                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7025                             data_list[i]->whoTo->flight_size,
7026                             data_list[i]->book_size,
7027                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7028                             data_list[i]->rec.data.tsn);
7029                 }
7030                 sctp_flight_size_increase(data_list[i]);
7031                 sctp_total_flight_increase(stcb, data_list[i]);
7032                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7033                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7034                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7035                 }
7036                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7037                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7038                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7039                         /* SWS sender side engages */
7040                         asoc->peers_rwnd = 0;
7041                 }
7042         }
7043         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7044                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7045         }
7046 }
7047
7048 static void
7049 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7050 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7051     SCTP_UNUSED
7052 #endif
7053 )
7054 {
7055         struct sctp_tmit_chunk *chk, *nchk;
7056
7057         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7058                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7059                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7060                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7061                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7062                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7063                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7064                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7065                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7066                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7067                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7068                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7069                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7070                         /* Stray chunks must be cleaned up */
7071         clean_up_anyway:
7072                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7073                         if (chk->data) {
7074                                 sctp_m_freem(chk->data);
7075                                 chk->data = NULL;
7076                         }
7077                         asoc->ctrl_queue_cnt--;
7078                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7079                                 asoc->fwd_tsn_cnt--;
7080                         sctp_free_a_chunk(stcb, chk, so_locked);
7081                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7082                         /* special handling, we must look into the param */
7083                         if (chk != asoc->str_reset) {
7084                                 goto clean_up_anyway;
7085                         }
7086                 }
7087         }
7088 }
7089
7090 static uint32_t
7091 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7092     uint32_t space_left, uint32_t frag_point, int eeor_on)
7093 {
7094         /*
7095          * Make a decision on if I should split a msg into multiple parts.
7096          * This is only asked of incomplete messages.
7097          */
7098         if (eeor_on) {
7099                 /*
7100                  * If we are doing EEOR we need to always send it if its the
7101                  * entire thing, since it might be all the guy is putting in
7102                  * the hopper.
7103                  */
7104                 if (space_left >= length) {
7105                         /*-
7106                          * If we have data outstanding,
7107                          * we get another chance when the sack
7108                          * arrives to transmit - wait for more data
7109                          */
7110                         if (stcb->asoc.total_flight == 0) {
7111                                 /*
7112                                  * If nothing is in flight, we zero the
7113                                  * packet counter.
7114                                  */
7115                                 return (length);
7116                         }
7117                         return (0);
7118
7119                 } else {
7120                         /* You can fill the rest */
7121                         return (space_left);
7122                 }
7123         }
7124         /*-
7125          * For those strange folk that make the send buffer
7126          * smaller than our fragmentation point, we can't
7127          * get a full msg in so we have to allow splitting.
7128          */
7129         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7130                 return (length);
7131         }
7132         if ((length <= space_left) ||
7133             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7134                 /* Sub-optimial residual don't split in non-eeor mode. */
7135                 return (0);
7136         }
7137         /*
7138          * If we reach here length is larger than the space_left. Do we wish
7139          * to split it for the sake of packet putting together?
7140          */
7141         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7142                 /* Its ok to split it */
7143                 return (min(space_left, frag_point));
7144         }
7145         /* Nope, can't split */
7146         return (0);
7147 }
7148
7149 static uint32_t
7150 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7151     struct sctp_stream_out *strq,
7152     uint32_t space_left,
7153     uint32_t frag_point,
7154     int *giveup,
7155     int eeor_mode,
7156     int *bail,
7157     int so_locked
7158 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7159     SCTP_UNUSED
7160 #endif
7161 )
7162 {
7163         /* Move from the stream to the send_queue keeping track of the total */
7164         struct sctp_association *asoc;
7165         struct sctp_stream_queue_pending *sp;
7166         struct sctp_tmit_chunk *chk;
7167         struct sctp_data_chunk *dchkh = NULL;
7168         struct sctp_idata_chunk *ndchkh = NULL;
7169         uint32_t to_move, length;
7170         int leading;
7171         uint8_t rcv_flags = 0;
7172         uint8_t some_taken;
7173         uint8_t send_lock_up = 0;
7174
7175         SCTP_TCB_LOCK_ASSERT(stcb);
7176         asoc = &stcb->asoc;
7177 one_more_time:
7178         /* sa_ignore FREED_MEMORY */
7179         sp = TAILQ_FIRST(&strq->outqueue);
7180         if (sp == NULL) {
7181                 if (send_lock_up == 0) {
7182                         SCTP_TCB_SEND_LOCK(stcb);
7183                         send_lock_up = 1;
7184                 }
7185                 sp = TAILQ_FIRST(&strq->outqueue);
7186                 if (sp) {
7187                         goto one_more_time;
7188                 }
7189                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7190                     (stcb->asoc.idata_supported == 0) &&
7191                     (strq->last_msg_incomplete)) {
7192                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7193                             strq->sid,
7194                             strq->last_msg_incomplete);
7195                         strq->last_msg_incomplete = 0;
7196                 }
7197                 to_move = 0;
7198                 if (send_lock_up) {
7199                         SCTP_TCB_SEND_UNLOCK(stcb);
7200                         send_lock_up = 0;
7201                 }
7202                 goto out_of;
7203         }
7204         if ((sp->msg_is_complete) && (sp->length == 0)) {
7205                 if (sp->sender_all_done) {
7206                         /*
7207                          * We are doing differed cleanup. Last time through
7208                          * when we took all the data the sender_all_done was
7209                          * not set.
7210                          */
7211                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7212                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7213                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7214                                     sp->sender_all_done,
7215                                     sp->length,
7216                                     sp->msg_is_complete,
7217                                     sp->put_last_out,
7218                                     send_lock_up);
7219                         }
7220                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7221                                 SCTP_TCB_SEND_LOCK(stcb);
7222                                 send_lock_up = 1;
7223                         }
7224                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7225                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7226                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7227                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7228                             (strq->chunks_on_queues == 0) &&
7229                             TAILQ_EMPTY(&strq->outqueue)) {
7230                                 stcb->asoc.trigger_reset = 1;
7231                         }
7232                         if (sp->net) {
7233                                 sctp_free_remote_addr(sp->net);
7234                                 sp->net = NULL;
7235                         }
7236                         if (sp->data) {
7237                                 sctp_m_freem(sp->data);
7238                                 sp->data = NULL;
7239                         }
7240                         sctp_free_a_strmoq(stcb, sp, so_locked);
7241                         /* we can't be locked to it */
7242                         if (send_lock_up) {
7243                                 SCTP_TCB_SEND_UNLOCK(stcb);
7244                                 send_lock_up = 0;
7245                         }
7246                         /* back to get the next msg */
7247                         goto one_more_time;
7248                 } else {
7249                         /*
7250                          * sender just finished this but still holds a
7251                          * reference
7252                          */
7253                         *giveup = 1;
7254                         to_move = 0;
7255                         goto out_of;
7256                 }
7257         } else {
7258                 /* is there some to get */
7259                 if (sp->length == 0) {
7260                         /* no */
7261                         *giveup = 1;
7262                         to_move = 0;
7263                         goto out_of;
7264                 } else if (sp->discard_rest) {
7265                         if (send_lock_up == 0) {
7266                                 SCTP_TCB_SEND_LOCK(stcb);
7267                                 send_lock_up = 1;
7268                         }
7269                         /* Whack down the size */
7270                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7271                         if ((stcb->sctp_socket != NULL) &&
7272                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7273                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7274                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7275                         }
7276                         if (sp->data) {
7277                                 sctp_m_freem(sp->data);
7278                                 sp->data = NULL;
7279                                 sp->tail_mbuf = NULL;
7280                         }
7281                         sp->length = 0;
7282                         sp->some_taken = 1;
7283                         *giveup = 1;
7284                         to_move = 0;
7285                         goto out_of;
7286                 }
7287         }
7288         some_taken = sp->some_taken;
7289 re_look:
7290         length = sp->length;
7291         if (sp->msg_is_complete) {
7292                 /* The message is complete */
7293                 to_move = min(length, frag_point);
7294                 if (to_move == length) {
7295                         /* All of it fits in the MTU */
7296                         if (sp->some_taken) {
7297                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7298                         } else {
7299                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7300                         }
7301                         sp->put_last_out = 1;
7302                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7303                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7304                         }
7305                 } else {
7306                         /* Not all of it fits, we fragment */
7307                         if (sp->some_taken == 0) {
7308                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7309                         }
7310                         sp->some_taken = 1;
7311                 }
7312         } else {
7313                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7314                 if (to_move) {
7315                         /*-
7316                          * We use a snapshot of length in case it
7317                          * is expanding during the compare.
7318                          */
7319                         uint32_t llen;
7320
7321                         llen = length;
7322                         if (to_move >= llen) {
7323                                 to_move = llen;
7324                                 if (send_lock_up == 0) {
7325                                         /*-
7326                                          * We are taking all of an incomplete msg
7327                                          * thus we need a send lock.
7328                                          */
7329                                         SCTP_TCB_SEND_LOCK(stcb);
7330                                         send_lock_up = 1;
7331                                         if (sp->msg_is_complete) {
7332                                                 /*
7333                                                  * the sender finished the
7334                                                  * msg
7335                                                  */
7336                                                 goto re_look;
7337                                         }
7338                                 }
7339                         }
7340                         if (sp->some_taken == 0) {
7341                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7342                                 sp->some_taken = 1;
7343                         }
7344                 } else {
7345                         /* Nothing to take. */
7346                         *giveup = 1;
7347                         to_move = 0;
7348                         goto out_of;
7349                 }
7350         }
7351
7352         /* If we reach here, we can copy out a chunk */
7353         sctp_alloc_a_chunk(stcb, chk);
7354         if (chk == NULL) {
7355                 /* No chunk memory */
7356                 *giveup = 1;
7357                 to_move = 0;
7358                 goto out_of;
7359         }
7360         /*
7361          * Setup for unordered if needed by looking at the user sent info
7362          * flags.
7363          */
7364         if (sp->sinfo_flags & SCTP_UNORDERED) {
7365                 rcv_flags |= SCTP_DATA_UNORDERED;
7366         }
7367         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7368             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7369                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7370         }
7371         /* clear out the chunk before setting up */
7372         memset(chk, 0, sizeof(*chk));
7373         chk->rec.data.rcv_flags = rcv_flags;
7374
7375         if (to_move >= length) {
7376                 /* we think we can steal the whole thing */
7377                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7378                         SCTP_TCB_SEND_LOCK(stcb);
7379                         send_lock_up = 1;
7380                 }
7381                 if (to_move < sp->length) {
7382                         /* bail, it changed */
7383                         goto dont_do_it;
7384                 }
7385                 chk->data = sp->data;
7386                 chk->last_mbuf = sp->tail_mbuf;
7387                 /* register the stealing */
7388                 sp->data = sp->tail_mbuf = NULL;
7389         } else {
7390                 struct mbuf *m;
7391
7392 dont_do_it:
7393                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7394                 chk->last_mbuf = NULL;
7395                 if (chk->data == NULL) {
7396                         sp->some_taken = some_taken;
7397                         sctp_free_a_chunk(stcb, chk, so_locked);
7398                         *bail = 1;
7399                         to_move = 0;
7400                         goto out_of;
7401                 }
7402 #ifdef SCTP_MBUF_LOGGING
7403                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7404                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7405                 }
7406 #endif
7407                 /* Pull off the data */
7408                 m_adj(sp->data, to_move);
7409                 /* Now lets work our way down and compact it */
7410                 m = sp->data;
7411                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7412                         sp->data = SCTP_BUF_NEXT(m);
7413                         SCTP_BUF_NEXT(m) = NULL;
7414                         if (sp->tail_mbuf == m) {
7415                                 /*-
7416                                  * Freeing tail? TSNH since
7417                                  * we supposedly were taking less
7418                                  * than the sp->length.
7419                                  */
7420 #ifdef INVARIANTS
7421                                 panic("Huh, freing tail? - TSNH");
7422 #else
7423                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7424                                 sp->tail_mbuf = sp->data = NULL;
7425                                 sp->length = 0;
7426 #endif
7427
7428                         }
7429                         sctp_m_free(m);
7430                         m = sp->data;
7431                 }
7432         }
7433         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7434                 chk->copy_by_ref = 1;
7435         } else {
7436                 chk->copy_by_ref = 0;
7437         }
7438         /*
7439          * get last_mbuf and counts of mb usage This is ugly but hopefully
7440          * its only one mbuf.
7441          */
7442         if (chk->last_mbuf == NULL) {
7443                 chk->last_mbuf = chk->data;
7444                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7445                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7446                 }
7447         }
7448         if (to_move > length) {
7449                 /*- This should not happen either
7450                  * since we always lower to_move to the size
7451                  * of sp->length if its larger.
7452                  */
7453 #ifdef INVARIANTS
7454                 panic("Huh, how can to_move be larger?");
7455 #else
7456                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7457                 sp->length = 0;
7458 #endif
7459         } else {
7460                 atomic_subtract_int(&sp->length, to_move);
7461         }
7462         if (stcb->asoc.idata_supported == 0) {
7463                 leading = sizeof(struct sctp_data_chunk);
7464         } else {
7465                 leading = sizeof(struct sctp_idata_chunk);
7466         }
7467         if (M_LEADINGSPACE(chk->data) < leading) {
7468                 /* Not enough room for a chunk header, get some */
7469                 struct mbuf *m;
7470
7471                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7472                 if (m == NULL) {
7473                         /*
7474                          * we're in trouble here. _PREPEND below will free
7475                          * all the data if there is no leading space, so we
7476                          * must put the data back and restore.
7477                          */
7478                         if (send_lock_up == 0) {
7479                                 SCTP_TCB_SEND_LOCK(stcb);
7480                                 send_lock_up = 1;
7481                         }
7482                         if (sp->data == NULL) {
7483                                 /* unsteal the data */
7484                                 sp->data = chk->data;
7485                                 sp->tail_mbuf = chk->last_mbuf;
7486                         } else {
7487                                 struct mbuf *m_tmp;
7488
7489                                 /* reassemble the data */
7490                                 m_tmp = sp->data;
7491                                 sp->data = chk->data;
7492                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7493                         }
7494                         sp->some_taken = some_taken;
7495                         atomic_add_int(&sp->length, to_move);
7496                         chk->data = NULL;
7497                         *bail = 1;
7498                         sctp_free_a_chunk(stcb, chk, so_locked);
7499                         to_move = 0;
7500                         goto out_of;
7501                 } else {
7502                         SCTP_BUF_LEN(m) = 0;
7503                         SCTP_BUF_NEXT(m) = chk->data;
7504                         chk->data = m;
7505                         M_ALIGN(chk->data, 4);
7506                 }
7507         }
7508         if (stcb->asoc.idata_supported == 0) {
7509                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7510         } else {
7511                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
7512         }
7513         if (chk->data == NULL) {
7514                 /* HELP, TSNH since we assured it would not above? */
7515 #ifdef INVARIANTS
7516                 panic("prepend failes HELP?");
7517 #else
7518                 SCTP_PRINTF("prepend fails HELP?\n");
7519                 sctp_free_a_chunk(stcb, chk, so_locked);
7520 #endif
7521                 *bail = 1;
7522                 to_move = 0;
7523                 goto out_of;
7524         }
7525         if (stcb->asoc.idata_supported == 0) {
7526                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7527                 chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_data_chunk));
7528         } else {
7529                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
7530                 chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_idata_chunk));
7531         }
7532         chk->book_size_scale = 0;
7533         chk->sent = SCTP_DATAGRAM_UNSENT;
7534
7535         chk->flags = 0;
7536         chk->asoc = &stcb->asoc;
7537         chk->pad_inplace = 0;
7538         chk->no_fr_allowed = 0;
7539         if (stcb->asoc.idata_supported == 0) {
7540                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7541                         /* Just use 0. The receiver ignores the values. */
7542                         chk->rec.data.mid = 0;
7543                 } else {
7544                         chk->rec.data.mid = strq->next_mid_ordered;
7545                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7546                                 strq->next_mid_ordered++;
7547                         }
7548                 }
7549         } else {
7550                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7551                         chk->rec.data.mid = strq->next_mid_unordered;
7552                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7553                                 strq->next_mid_unordered++;
7554                         }
7555                 } else {
7556                         chk->rec.data.mid = strq->next_mid_ordered;
7557                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7558                                 strq->next_mid_ordered++;
7559                         }
7560                 }
7561         }
7562         chk->rec.data.sid = sp->sid;
7563         chk->rec.data.ppid = sp->ppid;
7564         chk->rec.data.context = sp->context;
7565         chk->rec.data.doing_fast_retransmit = 0;
7566
7567         chk->rec.data.timetodrop = sp->ts;
7568         chk->flags = sp->act_flags;
7569
7570         if (sp->net) {
7571                 chk->whoTo = sp->net;
7572                 atomic_add_int(&chk->whoTo->ref_count, 1);
7573         } else
7574                 chk->whoTo = NULL;
7575
7576         if (sp->holds_key_ref) {
7577                 chk->auth_keyid = sp->auth_keyid;
7578                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7579                 chk->holds_key_ref = 1;
7580         }
7581         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7582         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7583                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7584                     (uint32_t)(uintptr_t)stcb, sp->length,
7585                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7586                     chk->rec.data.tsn);
7587         }
7588         if (stcb->asoc.idata_supported == 0) {
7589                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7590         } else {
7591                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7592         }
7593         /*
7594          * Put the rest of the things in place now. Size was done earlier in
7595          * previous loop prior to padding.
7596          */
7597
7598 #ifdef SCTP_ASOCLOG_OF_TSNS
7599         SCTP_TCB_LOCK_ASSERT(stcb);
7600         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7601                 asoc->tsn_out_at = 0;
7602                 asoc->tsn_out_wrapped = 1;
7603         }
7604         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7605         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7606         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7607         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7608         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7609         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7610         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7611         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7612         asoc->tsn_out_at++;
7613 #endif
7614         if (stcb->asoc.idata_supported == 0) {
7615                 dchkh->ch.chunk_type = SCTP_DATA;
7616                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7617                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7618                 dchkh->dp.sid = htons(strq->sid);
7619                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7620                 dchkh->dp.ppid = chk->rec.data.ppid;
7621                 dchkh->ch.chunk_length = htons(chk->send_size);
7622         } else {
7623                 ndchkh->ch.chunk_type = SCTP_IDATA;
7624                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7625                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7626                 ndchkh->dp.sid = htons(strq->sid);
7627                 ndchkh->dp.reserved = htons(0);
7628                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7629                 if (sp->fsn == 0)
7630                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7631                 else
7632                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7633                 sp->fsn++;
7634                 ndchkh->ch.chunk_length = htons(chk->send_size);
7635         }
7636         /* Now advance the chk->send_size by the actual pad needed. */
7637         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7638                 /* need a pad */
7639                 struct mbuf *lm;
7640                 int pads;
7641
7642                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7643                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7644                 if (lm != NULL) {
7645                         chk->last_mbuf = lm;
7646                         chk->pad_inplace = 1;
7647                 }
7648                 chk->send_size += pads;
7649         }
7650         if (PR_SCTP_ENABLED(chk->flags)) {
7651                 asoc->pr_sctp_cnt++;
7652         }
7653         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7654                 /* All done pull and kill the message */
7655                 if (sp->put_last_out == 0) {
7656                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7657                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7658                             sp->sender_all_done,
7659                             sp->length,
7660                             sp->msg_is_complete,
7661                             sp->put_last_out,
7662                             send_lock_up);
7663                 }
7664                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7665                         SCTP_TCB_SEND_LOCK(stcb);
7666                         send_lock_up = 1;
7667                 }
7668                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7669                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7670                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7671                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7672                     (strq->chunks_on_queues == 0) &&
7673                     TAILQ_EMPTY(&strq->outqueue)) {
7674                         stcb->asoc.trigger_reset = 1;
7675                 }
7676                 if (sp->net) {
7677                         sctp_free_remote_addr(sp->net);
7678                         sp->net = NULL;
7679                 }
7680                 if (sp->data) {
7681                         sctp_m_freem(sp->data);
7682                         sp->data = NULL;
7683                 }
7684                 sctp_free_a_strmoq(stcb, sp, so_locked);
7685         }
7686         asoc->chunks_on_out_queue++;
7687         strq->chunks_on_queues++;
7688         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7689         asoc->send_queue_cnt++;
7690 out_of:
7691         if (send_lock_up) {
7692                 SCTP_TCB_SEND_UNLOCK(stcb);
7693         }
7694         return (to_move);
7695 }
7696
7697
7698 static void
7699 sctp_fill_outqueue(struct sctp_tcb *stcb,
7700     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7701 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7702     SCTP_UNUSED
7703 #endif
7704 )
7705 {
7706         struct sctp_association *asoc;
7707         struct sctp_stream_out *strq;
7708         uint32_t space_left, moved, total_moved;
7709         int bail, giveup;
7710
7711         SCTP_TCB_LOCK_ASSERT(stcb);
7712         asoc = &stcb->asoc;
7713         total_moved = 0;
7714         switch (net->ro._l_addr.sa.sa_family) {
7715 #ifdef INET
7716         case AF_INET:
7717                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7718                 break;
7719 #endif
7720 #ifdef INET6
7721         case AF_INET6:
7722                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7723                 break;
7724 #endif
7725         default:
7726                 /* TSNH */
7727                 space_left = net->mtu;
7728                 break;
7729         }
7730         /* Need an allowance for the data chunk header too */
7731         if (stcb->asoc.idata_supported == 0) {
7732                 space_left -= sizeof(struct sctp_data_chunk);
7733         } else {
7734                 space_left -= sizeof(struct sctp_idata_chunk);
7735         }
7736
7737         /* must make even word boundary */
7738         space_left &= 0xfffffffc;
7739         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7740         giveup = 0;
7741         bail = 0;
7742         while ((space_left > 0) && (strq != NULL)) {
7743                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7744                     &giveup, eeor_mode, &bail, so_locked);
7745                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7746                 if ((giveup != 0) || (bail != 0)) {
7747                         break;
7748                 }
7749                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7750                 total_moved += moved;
7751                 space_left -= moved;
7752                 if (stcb->asoc.idata_supported == 0) {
7753                         if (space_left >= sizeof(struct sctp_data_chunk)) {
7754                                 space_left -= sizeof(struct sctp_data_chunk);
7755                         } else {
7756                                 space_left = 0;
7757                         }
7758                 } else {
7759                         if (space_left >= sizeof(struct sctp_idata_chunk)) {
7760                                 space_left -= sizeof(struct sctp_idata_chunk);
7761                         } else {
7762                                 space_left = 0;
7763                         }
7764                 }
7765                 space_left &= 0xfffffffc;
7766         }
7767         if (bail != 0)
7768                 *quit_now = 1;
7769
7770         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7771
7772         if (total_moved == 0) {
7773                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7774                     (net == stcb->asoc.primary_destination)) {
7775                         /* ran dry for primary network net */
7776                         SCTP_STAT_INCR(sctps_primary_randry);
7777                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7778                         /* ran dry with CMT on */
7779                         SCTP_STAT_INCR(sctps_cmt_randry);
7780                 }
7781         }
7782 }
7783
7784 void
7785 sctp_fix_ecn_echo(struct sctp_association *asoc)
7786 {
7787         struct sctp_tmit_chunk *chk;
7788
7789         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7790                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7791                         chk->sent = SCTP_DATAGRAM_UNSENT;
7792                 }
7793         }
7794 }
7795
7796 void
7797 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7798 {
7799         struct sctp_association *asoc;
7800         struct sctp_tmit_chunk *chk;
7801         struct sctp_stream_queue_pending *sp;
7802         unsigned int i;
7803
7804         if (net == NULL) {
7805                 return;
7806         }
7807         asoc = &stcb->asoc;
7808         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7809                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7810                         if (sp->net == net) {
7811                                 sctp_free_remote_addr(sp->net);
7812                                 sp->net = NULL;
7813                         }
7814                 }
7815         }
7816         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7817                 if (chk->whoTo == net) {
7818                         sctp_free_remote_addr(chk->whoTo);
7819                         chk->whoTo = NULL;
7820                 }
7821         }
7822 }
7823
7824 int
7825 sctp_med_chunk_output(struct sctp_inpcb *inp,
7826     struct sctp_tcb *stcb,
7827     struct sctp_association *asoc,
7828     int *num_out,
7829     int *reason_code,
7830     int control_only, int from_where,
7831     struct timeval *now, int *now_filled, int frag_point, int so_locked
7832 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7833     SCTP_UNUSED
7834 #endif
7835 )
7836 {
7837         /**
7838          * Ok this is the generic chunk service queue. we must do the
7839          * following:
7840          * - Service the stream queue that is next, moving any
7841          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7842          *   LAST to the out queue in one pass) and assigning TSN's. This
7843          *   only applys though if the peer does not support NDATA. For NDATA
7844          *   chunks its ok to not send the entire message ;-)
7845          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7846          *   fomulate and send the low level chunks. Making sure to combine
7847          *   any control in the control chunk queue also.
7848          */
7849         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7850         struct mbuf *outchain, *endoutchain;
7851         struct sctp_tmit_chunk *chk, *nchk;
7852
7853         /* temp arrays for unlinking */
7854         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7855         int no_fragmentflg, error;
7856         unsigned int max_rwnd_per_dest, max_send_per_dest;
7857         int one_chunk, hbflag, skip_data_for_this_net;
7858         int asconf, cookie, no_out_cnt;
7859         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7860         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7861         int tsns_sent = 0;
7862         uint32_t auth_offset = 0;
7863         struct sctp_auth_chunk *auth = NULL;
7864         uint16_t auth_keyid;
7865         int override_ok = 1;
7866         int skip_fill_up = 0;
7867         int data_auth_reqd = 0;
7868
7869         /*
7870          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7871          * destination.
7872          */
7873         int quit_now = 0;
7874
7875         *num_out = 0;
7876         *reason_code = 0;
7877         auth_keyid = stcb->asoc.authinfo.active_keyid;
7878         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7879             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7880             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7881                 eeor_mode = 1;
7882         } else {
7883                 eeor_mode = 0;
7884         }
7885         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7886         /*
7887          * First lets prime the pump. For each destination, if there is room
7888          * in the flight size, attempt to pull an MTU's worth out of the
7889          * stream queues into the general send_queue
7890          */
7891 #ifdef SCTP_AUDITING_ENABLED
7892         sctp_audit_log(0xC2, 2);
7893 #endif
7894         SCTP_TCB_LOCK_ASSERT(stcb);
7895         hbflag = 0;
7896         if (control_only)
7897                 no_data_chunks = 1;
7898         else
7899                 no_data_chunks = 0;
7900
7901         /* Nothing to possible to send? */
7902         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7903             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7904             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7905             TAILQ_EMPTY(&asoc->send_queue) &&
7906             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7907 nothing_to_send:
7908                 *reason_code = 9;
7909                 return (0);
7910         }
7911         if (asoc->peers_rwnd == 0) {
7912                 /* No room in peers rwnd */
7913                 *reason_code = 1;
7914                 if (asoc->total_flight > 0) {
7915                         /* we are allowed one chunk in flight */
7916                         no_data_chunks = 1;
7917                 }
7918         }
7919         if (stcb->asoc.ecn_echo_cnt_onq) {
7920                 /* Record where a sack goes, if any */
7921                 if (no_data_chunks &&
7922                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7923                         /* Nothing but ECNe to send - we don't do that */
7924                         goto nothing_to_send;
7925                 }
7926                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7927                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7928                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7929                                 sack_goes_to = chk->whoTo;
7930                                 break;
7931                         }
7932                 }
7933         }
7934         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7935         if (stcb->sctp_socket)
7936                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7937         else
7938                 max_send_per_dest = 0;
7939         if (no_data_chunks == 0) {
7940                 /* How many non-directed chunks are there? */
7941                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7942                         if (chk->whoTo == NULL) {
7943                                 /*
7944                                  * We already have non-directed chunks on
7945                                  * the queue, no need to do a fill-up.
7946                                  */
7947                                 skip_fill_up = 1;
7948                                 break;
7949                         }
7950                 }
7951
7952         }
7953         if ((no_data_chunks == 0) &&
7954             (skip_fill_up == 0) &&
7955             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7956                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7957                         /*
7958                          * This for loop we are in takes in each net, if
7959                          * its's got space in cwnd and has data sent to it
7960                          * (when CMT is off) then it calls
7961                          * sctp_fill_outqueue for the net. This gets data on
7962                          * the send queue for that network.
7963                          *
7964                          * In sctp_fill_outqueue TSN's are assigned and data
7965                          * is copied out of the stream buffers. Note mostly
7966                          * copy by reference (we hope).
7967                          */
7968                         net->window_probe = 0;
7969                         if ((net != stcb->asoc.alternate) &&
7970                             ((net->dest_state & SCTP_ADDR_PF) ||
7971                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7972                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7973                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7974                                         sctp_log_cwnd(stcb, net, 1,
7975                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7976                                 }
7977                                 continue;
7978                         }
7979                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7980                             (net->flight_size == 0)) {
7981                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7982                         }
7983                         if (net->flight_size >= net->cwnd) {
7984                                 /* skip this network, no room - can't fill */
7985                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7986                                         sctp_log_cwnd(stcb, net, 3,
7987                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7988                                 }
7989                                 continue;
7990                         }
7991                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7992                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7993                         }
7994                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7995                         if (quit_now) {
7996                                 /* memory alloc failure */
7997                                 no_data_chunks = 1;
7998                                 break;
7999                         }
8000                 }
8001         }
8002         /* now service each destination and send out what we can for it */
8003         /* Nothing to send? */
8004         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8005             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8006             TAILQ_EMPTY(&asoc->send_queue)) {
8007                 *reason_code = 8;
8008                 return (0);
8009         }
8010         if (asoc->sctp_cmt_on_off > 0) {
8011                 /* get the last start point */
8012                 start_at = asoc->last_net_cmt_send_started;
8013                 if (start_at == NULL) {
8014                         /* null so to beginning */
8015                         start_at = TAILQ_FIRST(&asoc->nets);
8016                 } else {
8017                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8018                         if (start_at == NULL) {
8019                                 start_at = TAILQ_FIRST(&asoc->nets);
8020                         }
8021                 }
8022                 asoc->last_net_cmt_send_started = start_at;
8023         } else {
8024                 start_at = TAILQ_FIRST(&asoc->nets);
8025         }
8026         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8027                 if (chk->whoTo == NULL) {
8028                         if (asoc->alternate) {
8029                                 chk->whoTo = asoc->alternate;
8030                         } else {
8031                                 chk->whoTo = asoc->primary_destination;
8032                         }
8033                         atomic_add_int(&chk->whoTo->ref_count, 1);
8034                 }
8035         }
8036         old_start_at = NULL;
8037 again_one_more_time:
8038         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8039                 /* how much can we send? */
8040                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8041                 if (old_start_at && (old_start_at == net)) {
8042                         /* through list ocmpletely. */
8043                         break;
8044                 }
8045                 tsns_sent = 0xa;
8046                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8047                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8048                     (net->flight_size >= net->cwnd)) {
8049                         /*
8050                          * Nothing on control or asconf and flight is full,
8051                          * we can skip even in the CMT case.
8052                          */
8053                         continue;
8054                 }
8055                 bundle_at = 0;
8056                 endoutchain = outchain = NULL;
8057                 no_fragmentflg = 1;
8058                 one_chunk = 0;
8059                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8060                         skip_data_for_this_net = 1;
8061                 } else {
8062                         skip_data_for_this_net = 0;
8063                 }
8064                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8065 #ifdef INET
8066                 case AF_INET:
8067                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8068                         break;
8069 #endif
8070 #ifdef INET6
8071                 case AF_INET6:
8072                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8073                         break;
8074 #endif
8075                 default:
8076                         /* TSNH */
8077                         mtu = net->mtu;
8078                         break;
8079                 }
8080                 mx_mtu = mtu;
8081                 to_out = 0;
8082                 if (mtu > asoc->peers_rwnd) {
8083                         if (asoc->total_flight > 0) {
8084                                 /* We have a packet in flight somewhere */
8085                                 r_mtu = asoc->peers_rwnd;
8086                         } else {
8087                                 /* We are always allowed to send one MTU out */
8088                                 one_chunk = 1;
8089                                 r_mtu = mtu;
8090                         }
8091                 } else {
8092                         r_mtu = mtu;
8093                 }
8094                 error = 0;
8095                 /************************/
8096                 /* ASCONF transmission */
8097                 /************************/
8098                 /* Now first lets go through the asconf queue */
8099                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8100                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8101                                 continue;
8102                         }
8103                         if (chk->whoTo == NULL) {
8104                                 if (asoc->alternate == NULL) {
8105                                         if (asoc->primary_destination != net) {
8106                                                 break;
8107                                         }
8108                                 } else {
8109                                         if (asoc->alternate != net) {
8110                                                 break;
8111                                         }
8112                                 }
8113                         } else {
8114                                 if (chk->whoTo != net) {
8115                                         break;
8116                                 }
8117                         }
8118                         if (chk->data == NULL) {
8119                                 break;
8120                         }
8121                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8122                             chk->sent != SCTP_DATAGRAM_RESEND) {
8123                                 break;
8124                         }
8125                         /*
8126                          * if no AUTH is yet included and this chunk
8127                          * requires it, make sure to account for it.  We
8128                          * don't apply the size until the AUTH chunk is
8129                          * actually added below in case there is no room for
8130                          * this chunk. NOTE: we overload the use of "omtu"
8131                          * here
8132                          */
8133                         if ((auth == NULL) &&
8134                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8135                             stcb->asoc.peer_auth_chunks)) {
8136                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8137                         } else
8138                                 omtu = 0;
8139                         /* Here we do NOT factor the r_mtu */
8140                         if ((chk->send_size < (int)(mtu - omtu)) ||
8141                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8142                                 /*
8143                                  * We probably should glom the mbuf chain
8144                                  * from the chk->data for control but the
8145                                  * problem is it becomes yet one more level
8146                                  * of tracking to do if for some reason
8147                                  * output fails. Then I have got to
8148                                  * reconstruct the merged control chain.. el
8149                                  * yucko.. for now we take the easy way and
8150                                  * do the copy
8151                                  */
8152                                 /*
8153                                  * Add an AUTH chunk, if chunk requires it
8154                                  * save the offset into the chain for AUTH
8155                                  */
8156                                 if ((auth == NULL) &&
8157                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8158                                     stcb->asoc.peer_auth_chunks))) {
8159                                         outchain = sctp_add_auth_chunk(outchain,
8160                                             &endoutchain,
8161                                             &auth,
8162                                             &auth_offset,
8163                                             stcb,
8164                                             chk->rec.chunk_id.id);
8165                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8166                                 }
8167                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8168                                     (int)chk->rec.chunk_id.can_take_data,
8169                                     chk->send_size, chk->copy_by_ref);
8170                                 if (outchain == NULL) {
8171                                         *reason_code = 8;
8172                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8173                                         return (ENOMEM);
8174                                 }
8175                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8176                                 /* update our MTU size */
8177                                 if (mtu > (chk->send_size + omtu))
8178                                         mtu -= (chk->send_size + omtu);
8179                                 else
8180                                         mtu = 0;
8181                                 to_out += (chk->send_size + omtu);
8182                                 /* Do clear IP_DF ? */
8183                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8184                                         no_fragmentflg = 0;
8185                                 }
8186                                 if (chk->rec.chunk_id.can_take_data)
8187                                         chk->data = NULL;
8188                                 /*
8189                                  * set hb flag since we can use these for
8190                                  * RTO
8191                                  */
8192                                 hbflag = 1;
8193                                 asconf = 1;
8194                                 /*
8195                                  * should sysctl this: don't bundle data
8196                                  * with ASCONF since it requires AUTH
8197                                  */
8198                                 no_data_chunks = 1;
8199                                 chk->sent = SCTP_DATAGRAM_SENT;
8200                                 if (chk->whoTo == NULL) {
8201                                         chk->whoTo = net;
8202                                         atomic_add_int(&net->ref_count, 1);
8203                                 }
8204                                 chk->snd_count++;
8205                                 if (mtu == 0) {
8206                                         /*
8207                                          * Ok we are out of room but we can
8208                                          * output without effecting the
8209                                          * flight size since this little guy
8210                                          * is a control only packet.
8211                                          */
8212                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8213                                         /*
8214                                          * do NOT clear the asconf flag as
8215                                          * it is used to do appropriate
8216                                          * source address selection.
8217                                          */
8218                                         if (*now_filled == 0) {
8219                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8220                                                 *now_filled = 1;
8221                                         }
8222                                         net->last_sent_time = *now;
8223                                         hbflag = 0;
8224                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8225                                             (struct sockaddr *)&net->ro._l_addr,
8226                                             outchain, auth_offset, auth,
8227                                             stcb->asoc.authinfo.active_keyid,
8228                                             no_fragmentflg, 0, asconf,
8229                                             inp->sctp_lport, stcb->rport,
8230                                             htonl(stcb->asoc.peer_vtag),
8231                                             net->port, NULL,
8232                                             0, 0,
8233                                             so_locked))) {
8234                                                 /*
8235                                                  * error, we could not
8236                                                  * output
8237                                                  */
8238                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8239                                                 if (from_where == 0) {
8240                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8241                                                 }
8242                                                 if (error == ENOBUFS) {
8243                                                         asoc->ifp_had_enobuf = 1;
8244                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8245                                                 }
8246                                                 /* error, could not output */
8247                                                 if (error == EHOSTUNREACH) {
8248                                                         /*
8249                                                          * Destination went
8250                                                          * unreachable
8251                                                          * during this send
8252                                                          */
8253                                                         sctp_move_chunks_from_net(stcb, net);
8254                                                 }
8255                                                 *reason_code = 7;
8256                                                 break;
8257                                         } else {
8258                                                 asoc->ifp_had_enobuf = 0;
8259                                         }
8260                                         /*
8261                                          * increase the number we sent, if a
8262                                          * cookie is sent we don't tell them
8263                                          * any was sent out.
8264                                          */
8265                                         outchain = endoutchain = NULL;
8266                                         auth = NULL;
8267                                         auth_offset = 0;
8268                                         if (!no_out_cnt)
8269                                                 *num_out += ctl_cnt;
8270                                         /* recalc a clean slate and setup */
8271                                         switch (net->ro._l_addr.sa.sa_family) {
8272 #ifdef INET
8273                                         case AF_INET:
8274                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8275                                                 break;
8276 #endif
8277 #ifdef INET6
8278                                         case AF_INET6:
8279                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8280                                                 break;
8281 #endif
8282                                         default:
8283                                                 /* TSNH */
8284                                                 mtu = net->mtu;
8285                                                 break;
8286                                         }
8287                                         to_out = 0;
8288                                         no_fragmentflg = 1;
8289                                 }
8290                         }
8291                 }
8292                 if (error != 0) {
8293                         /* try next net */
8294                         continue;
8295                 }
8296                 /************************/
8297                 /* Control transmission */
8298                 /************************/
8299                 /* Now first lets go through the control queue */
8300                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8301                         if ((sack_goes_to) &&
8302                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8303                             (chk->whoTo != sack_goes_to)) {
8304                                 /*
8305                                  * if we have a sack in queue, and we are
8306                                  * looking at an ecn echo that is NOT queued
8307                                  * to where the sack is going..
8308                                  */
8309                                 if (chk->whoTo == net) {
8310                                         /*
8311                                          * Don't transmit it to where its
8312                                          * going (current net)
8313                                          */
8314                                         continue;
8315                                 } else if (sack_goes_to == net) {
8316                                         /*
8317                                          * But do transmit it to this
8318                                          * address
8319                                          */
8320                                         goto skip_net_check;
8321                                 }
8322                         }
8323                         if (chk->whoTo == NULL) {
8324                                 if (asoc->alternate == NULL) {
8325                                         if (asoc->primary_destination != net) {
8326                                                 continue;
8327                                         }
8328                                 } else {
8329                                         if (asoc->alternate != net) {
8330                                                 continue;
8331                                         }
8332                                 }
8333                         } else {
8334                                 if (chk->whoTo != net) {
8335                                         continue;
8336                                 }
8337                         }
8338         skip_net_check:
8339                         if (chk->data == NULL) {
8340                                 continue;
8341                         }
8342                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8343                                 /*
8344                                  * It must be unsent. Cookies and ASCONF's
8345                                  * hang around but there timers will force
8346                                  * when marked for resend.
8347                                  */
8348                                 continue;
8349                         }
8350                         /*
8351                          * if no AUTH is yet included and this chunk
8352                          * requires it, make sure to account for it.  We
8353                          * don't apply the size until the AUTH chunk is
8354                          * actually added below in case there is no room for
8355                          * this chunk. NOTE: we overload the use of "omtu"
8356                          * here
8357                          */
8358                         if ((auth == NULL) &&
8359                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8360                             stcb->asoc.peer_auth_chunks)) {
8361                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8362                         } else
8363                                 omtu = 0;
8364                         /* Here we do NOT factor the r_mtu */
8365                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8366                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8367                                 /*
8368                                  * We probably should glom the mbuf chain
8369                                  * from the chk->data for control but the
8370                                  * problem is it becomes yet one more level
8371                                  * of tracking to do if for some reason
8372                                  * output fails. Then I have got to
8373                                  * reconstruct the merged control chain.. el
8374                                  * yucko.. for now we take the easy way and
8375                                  * do the copy
8376                                  */
8377                                 /*
8378                                  * Add an AUTH chunk, if chunk requires it
8379                                  * save the offset into the chain for AUTH
8380                                  */
8381                                 if ((auth == NULL) &&
8382                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8383                                     stcb->asoc.peer_auth_chunks))) {
8384                                         outchain = sctp_add_auth_chunk(outchain,
8385                                             &endoutchain,
8386                                             &auth,
8387                                             &auth_offset,
8388                                             stcb,
8389                                             chk->rec.chunk_id.id);
8390                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8391                                 }
8392                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8393                                     (int)chk->rec.chunk_id.can_take_data,
8394                                     chk->send_size, chk->copy_by_ref);
8395                                 if (outchain == NULL) {
8396                                         *reason_code = 8;
8397                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8398                                         return (ENOMEM);
8399                                 }
8400                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8401                                 /* update our MTU size */
8402                                 if (mtu > (chk->send_size + omtu))
8403                                         mtu -= (chk->send_size + omtu);
8404                                 else
8405                                         mtu = 0;
8406                                 to_out += (chk->send_size + omtu);
8407                                 /* Do clear IP_DF ? */
8408                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8409                                         no_fragmentflg = 0;
8410                                 }
8411                                 if (chk->rec.chunk_id.can_take_data)
8412                                         chk->data = NULL;
8413                                 /* Mark things to be removed, if needed */
8414                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8415                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8416                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8417                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8418                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8419                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8420                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8421                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8422                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8423                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8424                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8425                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8426                                                 hbflag = 1;
8427                                         }
8428                                         /* remove these chunks at the end */
8429                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8430                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8431                                                 /* turn off the timer */
8432                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8433                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8434                                                             inp, stcb, net,
8435                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8436                                                 }
8437                                         }
8438                                         ctl_cnt++;
8439                                 } else {
8440                                         /*
8441                                          * Other chunks, since they have
8442                                          * timers running (i.e. COOKIE) we
8443                                          * just "trust" that it gets sent or
8444                                          * retransmitted.
8445                                          */
8446                                         ctl_cnt++;
8447                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8448                                                 cookie = 1;
8449                                                 no_out_cnt = 1;
8450                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8451                                                 /*
8452                                                  * Increment ecne send count
8453                                                  * here this means we may be
8454                                                  * over-zealous in our
8455                                                  * counting if the send
8456                                                  * fails, but its the best
8457                                                  * place to do it (we used
8458                                                  * to do it in the queue of
8459                                                  * the chunk, but that did
8460                                                  * not tell how many times
8461                                                  * it was sent.
8462                                                  */
8463                                                 SCTP_STAT_INCR(sctps_sendecne);
8464                                         }
8465                                         chk->sent = SCTP_DATAGRAM_SENT;
8466                                         if (chk->whoTo == NULL) {
8467                                                 chk->whoTo = net;
8468                                                 atomic_add_int(&net->ref_count, 1);
8469                                         }
8470                                         chk->snd_count++;
8471                                 }
8472                                 if (mtu == 0) {
8473                                         /*
8474                                          * Ok we are out of room but we can
8475                                          * output without effecting the
8476                                          * flight size since this little guy
8477                                          * is a control only packet.
8478                                          */
8479                                         if (asconf) {
8480                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8481                                                 /*
8482                                                  * do NOT clear the asconf
8483                                                  * flag as it is used to do
8484                                                  * appropriate source
8485                                                  * address selection.
8486                                                  */
8487                                         }
8488                                         if (cookie) {
8489                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8490                                                 cookie = 0;
8491                                         }
8492                                         /* Only HB or ASCONF advances time */
8493                                         if (hbflag) {
8494                                                 if (*now_filled == 0) {
8495                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8496                                                         *now_filled = 1;
8497                                                 }
8498                                                 net->last_sent_time = *now;
8499                                                 hbflag = 0;
8500                                         }
8501                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8502                                             (struct sockaddr *)&net->ro._l_addr,
8503                                             outchain,
8504                                             auth_offset, auth,
8505                                             stcb->asoc.authinfo.active_keyid,
8506                                             no_fragmentflg, 0, asconf,
8507                                             inp->sctp_lport, stcb->rport,
8508                                             htonl(stcb->asoc.peer_vtag),
8509                                             net->port, NULL,
8510                                             0, 0,
8511                                             so_locked))) {
8512                                                 /*
8513                                                  * error, we could not
8514                                                  * output
8515                                                  */
8516                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8517                                                 if (from_where == 0) {
8518                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8519                                                 }
8520                                                 if (error == ENOBUFS) {
8521                                                         asoc->ifp_had_enobuf = 1;
8522                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8523                                                 }
8524                                                 if (error == EHOSTUNREACH) {
8525                                                         /*
8526                                                          * Destination went
8527                                                          * unreachable
8528                                                          * during this send
8529                                                          */
8530                                                         sctp_move_chunks_from_net(stcb, net);
8531                                                 }
8532                                                 *reason_code = 7;
8533                                                 break;
8534                                         } else {
8535                                                 asoc->ifp_had_enobuf = 0;
8536                                         }
8537                                         /*
8538                                          * increase the number we sent, if a
8539                                          * cookie is sent we don't tell them
8540                                          * any was sent out.
8541                                          */
8542                                         outchain = endoutchain = NULL;
8543                                         auth = NULL;
8544                                         auth_offset = 0;
8545                                         if (!no_out_cnt)
8546                                                 *num_out += ctl_cnt;
8547                                         /* recalc a clean slate and setup */
8548                                         switch (net->ro._l_addr.sa.sa_family) {
8549 #ifdef INET
8550                                         case AF_INET:
8551                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8552                                                 break;
8553 #endif
8554 #ifdef INET6
8555                                         case AF_INET6:
8556                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8557                                                 break;
8558 #endif
8559                                         default:
8560                                                 /* TSNH */
8561                                                 mtu = net->mtu;
8562                                                 break;
8563                                         }
8564                                         to_out = 0;
8565                                         no_fragmentflg = 1;
8566                                 }
8567                         }
8568                 }
8569                 if (error != 0) {
8570                         /* try next net */
8571                         continue;
8572                 }
8573                 /* JRI: if dest is in PF state, do not send data to it */
8574                 if ((asoc->sctp_cmt_on_off > 0) &&
8575                     (net != stcb->asoc.alternate) &&
8576                     (net->dest_state & SCTP_ADDR_PF)) {
8577                         goto no_data_fill;
8578                 }
8579                 if (net->flight_size >= net->cwnd) {
8580                         goto no_data_fill;
8581                 }
8582                 if ((asoc->sctp_cmt_on_off > 0) &&
8583                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8584                     (net->flight_size > max_rwnd_per_dest)) {
8585                         goto no_data_fill;
8586                 }
8587                 /*
8588                  * We need a specific accounting for the usage of the send
8589                  * buffer. We also need to check the number of messages per
8590                  * net. For now, this is better than nothing and it disabled
8591                  * by default...
8592                  */
8593                 if ((asoc->sctp_cmt_on_off > 0) &&
8594                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8595                     (max_send_per_dest > 0) &&
8596                     (net->flight_size > max_send_per_dest)) {
8597                         goto no_data_fill;
8598                 }
8599                 /*********************/
8600                 /* Data transmission */
8601                 /*********************/
8602                 /*
8603                  * if AUTH for DATA is required and no AUTH has been added
8604                  * yet, account for this in the mtu now... if no data can be
8605                  * bundled, this adjustment won't matter anyways since the
8606                  * packet will be going out...
8607                  */
8608                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8609                     stcb->asoc.peer_auth_chunks);
8610                 if (data_auth_reqd && (auth == NULL)) {
8611                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8612                 }
8613                 /* now lets add any data within the MTU constraints */
8614                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8615 #ifdef INET
8616                 case AF_INET:
8617                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8618                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8619                         else
8620                                 omtu = 0;
8621                         break;
8622 #endif
8623 #ifdef INET6
8624                 case AF_INET6:
8625                         if (net->mtu > SCTP_MIN_OVERHEAD)
8626                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8627                         else
8628                                 omtu = 0;
8629                         break;
8630 #endif
8631                 default:
8632                         /* TSNH */
8633                         omtu = 0;
8634                         break;
8635                 }
8636                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8637                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8638                     (skip_data_for_this_net == 0)) ||
8639                     (cookie)) {
8640                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8641                                 if (no_data_chunks) {
8642                                         /* let only control go out */
8643                                         *reason_code = 1;
8644                                         break;
8645                                 }
8646                                 if (net->flight_size >= net->cwnd) {
8647                                         /* skip this net, no room for data */
8648                                         *reason_code = 2;
8649                                         break;
8650                                 }
8651                                 if ((chk->whoTo != NULL) &&
8652                                     (chk->whoTo != net)) {
8653                                         /* Don't send the chunk on this net */
8654                                         continue;
8655                                 }
8656                                 if (asoc->sctp_cmt_on_off == 0) {
8657                                         if ((asoc->alternate) &&
8658                                             (asoc->alternate != net) &&
8659                                             (chk->whoTo == NULL)) {
8660                                                 continue;
8661                                         } else if ((net != asoc->primary_destination) &&
8662                                                     (asoc->alternate == NULL) &&
8663                                             (chk->whoTo == NULL)) {
8664                                                 continue;
8665                                         }
8666                                 }
8667                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8668                                         /*-
8669                                          * strange, we have a chunk that is
8670                                          * to big for its destination and
8671                                          * yet no fragment ok flag.
8672                                          * Something went wrong when the
8673                                          * PMTU changed...we did not mark
8674                                          * this chunk for some reason?? I
8675                                          * will fix it here by letting IP
8676                                          * fragment it for now and printing
8677                                          * a warning. This really should not
8678                                          * happen ...
8679                                          */
8680                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8681                                             chk->send_size, mtu);
8682                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8683                                 }
8684                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8685                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8686                                         struct sctp_data_chunk *dchkh;
8687
8688                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8689                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8690                                 }
8691                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8692                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8693                                         /* ok we will add this one */
8694
8695                                         /*
8696                                          * Add an AUTH chunk, if chunk
8697                                          * requires it, save the offset into
8698                                          * the chain for AUTH
8699                                          */
8700                                         if (data_auth_reqd) {
8701                                                 if (auth == NULL) {
8702                                                         outchain = sctp_add_auth_chunk(outchain,
8703                                                             &endoutchain,
8704                                                             &auth,
8705                                                             &auth_offset,
8706                                                             stcb,
8707                                                             SCTP_DATA);
8708                                                         auth_keyid = chk->auth_keyid;
8709                                                         override_ok = 0;
8710                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8711                                                 } else if (override_ok) {
8712                                                         /*
8713                                                          * use this data's
8714                                                          * keyid
8715                                                          */
8716                                                         auth_keyid = chk->auth_keyid;
8717                                                         override_ok = 0;
8718                                                 } else if (auth_keyid != chk->auth_keyid) {
8719                                                         /*
8720                                                          * different keyid,
8721                                                          * so done bundling
8722                                                          */
8723                                                         break;
8724                                                 }
8725                                         }
8726                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8727                                             chk->send_size, chk->copy_by_ref);
8728                                         if (outchain == NULL) {
8729                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8730                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8731                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8732                                                 }
8733                                                 *reason_code = 3;
8734                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8735                                                 return (ENOMEM);
8736                                         }
8737                                         /* upate our MTU size */
8738                                         /* Do clear IP_DF ? */
8739                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8740                                                 no_fragmentflg = 0;
8741                                         }
8742                                         /* unsigned subtraction of mtu */
8743                                         if (mtu > chk->send_size)
8744                                                 mtu -= chk->send_size;
8745                                         else
8746                                                 mtu = 0;
8747                                         /* unsigned subtraction of r_mtu */
8748                                         if (r_mtu > chk->send_size)
8749                                                 r_mtu -= chk->send_size;
8750                                         else
8751                                                 r_mtu = 0;
8752
8753                                         to_out += chk->send_size;
8754                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8755 #ifdef INVARIANTS
8756                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8757 #else
8758                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8759                                                     mx_mtu, to_out);
8760 #endif
8761                                         }
8762                                         chk->window_probe = 0;
8763                                         data_list[bundle_at++] = chk;
8764                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8765                                                 break;
8766                                         }
8767                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8768                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8769                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8770                                                 } else {
8771                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8772                                                 }
8773                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8774                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8775                                                         /*
8776                                                          * Count number of
8777                                                          * user msg's that
8778                                                          * were fragmented
8779                                                          * we do this by
8780                                                          * counting when we
8781                                                          * see a LAST
8782                                                          * fragment only.
8783                                                          */
8784                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8785                                         }
8786                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8787                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8788                                                         data_list[0]->window_probe = 1;
8789                                                         net->window_probe = 1;
8790                                                 }
8791                                                 break;
8792                                         }
8793                                 } else {
8794                                         /*
8795                                          * Must be sent in order of the
8796                                          * TSN's (on a network)
8797                                          */
8798                                         break;
8799                                 }
8800                         }       /* for (chunk gather loop for this net) */
8801                 }               /* if asoc.state OPEN */
8802 no_data_fill:
8803                 /* Is there something to send for this destination? */
8804                 if (outchain) {
8805                         /* We may need to start a control timer or two */
8806                         if (asconf) {
8807                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8808                                     stcb, net);
8809                                 /*
8810                                  * do NOT clear the asconf flag as it is
8811                                  * used to do appropriate source address
8812                                  * selection.
8813                                  */
8814                         }
8815                         if (cookie) {
8816                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8817                                 cookie = 0;
8818                         }
8819                         /* must start a send timer if data is being sent */
8820                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8821                                 /*
8822                                  * no timer running on this destination
8823                                  * restart it.
8824                                  */
8825                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8826                         }
8827                         if (bundle_at || hbflag) {
8828                                 /* For data/asconf and hb set time */
8829                                 if (*now_filled == 0) {
8830                                         (void)SCTP_GETTIME_TIMEVAL(now);
8831                                         *now_filled = 1;
8832                                 }
8833                                 net->last_sent_time = *now;
8834                         }
8835                         /* Now send it, if there is anything to send :> */
8836                         if ((error = sctp_lowlevel_chunk_output(inp,
8837                             stcb,
8838                             net,
8839                             (struct sockaddr *)&net->ro._l_addr,
8840                             outchain,
8841                             auth_offset,
8842                             auth,
8843                             auth_keyid,
8844                             no_fragmentflg,
8845                             bundle_at,
8846                             asconf,
8847                             inp->sctp_lport, stcb->rport,
8848                             htonl(stcb->asoc.peer_vtag),
8849                             net->port, NULL,
8850                             0, 0,
8851                             so_locked))) {
8852                                 /* error, we could not output */
8853                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8854                                 if (from_where == 0) {
8855                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8856                                 }
8857                                 if (error == ENOBUFS) {
8858                                         asoc->ifp_had_enobuf = 1;
8859                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8860                                 }
8861                                 if (error == EHOSTUNREACH) {
8862                                         /*
8863                                          * Destination went unreachable
8864                                          * during this send
8865                                          */
8866                                         sctp_move_chunks_from_net(stcb, net);
8867                                 }
8868                                 *reason_code = 6;
8869                                 /*-
8870                                  * I add this line to be paranoid. As far as
8871                                  * I can tell the continue, takes us back to
8872                                  * the top of the for, but just to make sure
8873                                  * I will reset these again here.
8874                                  */
8875                                 ctl_cnt = bundle_at = 0;
8876                                 continue;       /* This takes us back to the
8877                                                  * for() for the nets. */
8878                         } else {
8879                                 asoc->ifp_had_enobuf = 0;
8880                         }
8881                         endoutchain = NULL;
8882                         auth = NULL;
8883                         auth_offset = 0;
8884                         if (!no_out_cnt) {
8885                                 *num_out += (ctl_cnt + bundle_at);
8886                         }
8887                         if (bundle_at) {
8888                                 /* setup for a RTO measurement */
8889                                 tsns_sent = data_list[0]->rec.data.tsn;
8890                                 /* fill time if not already filled */
8891                                 if (*now_filled == 0) {
8892                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8893                                         *now_filled = 1;
8894                                         *now = asoc->time_last_sent;
8895                                 } else {
8896                                         asoc->time_last_sent = *now;
8897                                 }
8898                                 if (net->rto_needed) {
8899                                         data_list[0]->do_rtt = 1;
8900                                         net->rto_needed = 0;
8901                                 }
8902                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8903                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8904                         }
8905                         if (one_chunk) {
8906                                 break;
8907                         }
8908                 }
8909                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8910                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8911                 }
8912         }
8913         if (old_start_at == NULL) {
8914                 old_start_at = start_at;
8915                 start_at = TAILQ_FIRST(&asoc->nets);
8916                 if (old_start_at)
8917                         goto again_one_more_time;
8918         }
8919         /*
8920          * At the end there should be no NON timed chunks hanging on this
8921          * queue.
8922          */
8923         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8924                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8925         }
8926         if ((*num_out == 0) && (*reason_code == 0)) {
8927                 *reason_code = 4;
8928         } else {
8929                 *reason_code = 5;
8930         }
8931         sctp_clean_up_ctl(stcb, asoc, so_locked);
8932         return (0);
8933 }
8934
8935 void
8936 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8937 {
8938         /*-
8939          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8940          * the control chunk queue.
8941          */
8942         struct sctp_chunkhdr *hdr;
8943         struct sctp_tmit_chunk *chk;
8944         struct mbuf *mat, *last_mbuf;
8945         uint32_t chunk_length;
8946         uint16_t padding_length;
8947
8948         SCTP_TCB_LOCK_ASSERT(stcb);
8949         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8950         if (op_err == NULL) {
8951                 return;
8952         }
8953         last_mbuf = NULL;
8954         chunk_length = 0;
8955         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8956                 chunk_length += SCTP_BUF_LEN(mat);
8957                 if (SCTP_BUF_NEXT(mat) == NULL) {
8958                         last_mbuf = mat;
8959                 }
8960         }
8961         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8962                 sctp_m_freem(op_err);
8963                 return;
8964         }
8965         padding_length = chunk_length % 4;
8966         if (padding_length != 0) {
8967                 padding_length = 4 - padding_length;
8968         }
8969         if (padding_length != 0) {
8970                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8971                         sctp_m_freem(op_err);
8972                         return;
8973                 }
8974         }
8975         sctp_alloc_a_chunk(stcb, chk);
8976         if (chk == NULL) {
8977                 /* no memory */
8978                 sctp_m_freem(op_err);
8979                 return;
8980         }
8981         chk->copy_by_ref = 0;
8982         chk->send_size = (uint16_t)chunk_length;
8983         chk->sent = SCTP_DATAGRAM_UNSENT;
8984         chk->snd_count = 0;
8985         chk->asoc = &stcb->asoc;
8986         chk->data = op_err;
8987         chk->whoTo = NULL;
8988         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8989         chk->rec.chunk_id.can_take_data = 0;
8990         hdr = mtod(op_err, struct sctp_chunkhdr *);
8991         hdr->chunk_type = SCTP_OPERATION_ERROR;
8992         hdr->chunk_flags = 0;
8993         hdr->chunk_length = htons(chk->send_size);
8994         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8995         chk->asoc->ctrl_queue_cnt++;
8996 }
8997
8998 int
8999 sctp_send_cookie_echo(struct mbuf *m,
9000     int offset,
9001     struct sctp_tcb *stcb,
9002     struct sctp_nets *net)
9003 {
9004         /*-
9005          * pull out the cookie and put it at the front of the control chunk
9006          * queue.
9007          */
9008         int at;
9009         struct mbuf *cookie;
9010         struct sctp_paramhdr param, *phdr;
9011         struct sctp_chunkhdr *hdr;
9012         struct sctp_tmit_chunk *chk;
9013         uint16_t ptype, plen;
9014
9015         SCTP_TCB_LOCK_ASSERT(stcb);
9016         /* First find the cookie in the param area */
9017         cookie = NULL;
9018         at = offset + sizeof(struct sctp_init_chunk);
9019         for (;;) {
9020                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9021                 if (phdr == NULL) {
9022                         return (-3);
9023                 }
9024                 ptype = ntohs(phdr->param_type);
9025                 plen = ntohs(phdr->param_length);
9026                 if (ptype == SCTP_STATE_COOKIE) {
9027                         int pad;
9028
9029                         /* found the cookie */
9030                         if ((pad = (plen % 4))) {
9031                                 plen += 4 - pad;
9032                         }
9033                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9034                         if (cookie == NULL) {
9035                                 /* No memory */
9036                                 return (-2);
9037                         }
9038 #ifdef SCTP_MBUF_LOGGING
9039                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9040                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9041                         }
9042 #endif
9043                         break;
9044                 }
9045                 at += SCTP_SIZE32(plen);
9046         }
9047         /* ok, we got the cookie lets change it into a cookie echo chunk */
9048         /* first the change from param to cookie */
9049         hdr = mtod(cookie, struct sctp_chunkhdr *);
9050         hdr->chunk_type = SCTP_COOKIE_ECHO;
9051         hdr->chunk_flags = 0;
9052         /* get the chunk stuff now and place it in the FRONT of the queue */
9053         sctp_alloc_a_chunk(stcb, chk);
9054         if (chk == NULL) {
9055                 /* no memory */
9056                 sctp_m_freem(cookie);
9057                 return (-5);
9058         }
9059         chk->copy_by_ref = 0;
9060         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9061         chk->rec.chunk_id.can_take_data = 0;
9062         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9063         chk->send_size = plen;
9064         chk->sent = SCTP_DATAGRAM_UNSENT;
9065         chk->snd_count = 0;
9066         chk->asoc = &stcb->asoc;
9067         chk->data = cookie;
9068         chk->whoTo = net;
9069         atomic_add_int(&chk->whoTo->ref_count, 1);
9070         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9071         chk->asoc->ctrl_queue_cnt++;
9072         return (0);
9073 }
9074
9075 void
9076 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9077     struct mbuf *m,
9078     int offset,
9079     int chk_length,
9080     struct sctp_nets *net)
9081 {
9082         /*
9083          * take a HB request and make it into a HB ack and send it.
9084          */
9085         struct mbuf *outchain;
9086         struct sctp_chunkhdr *chdr;
9087         struct sctp_tmit_chunk *chk;
9088
9089
9090         if (net == NULL)
9091                 /* must have a net pointer */
9092                 return;
9093
9094         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9095         if (outchain == NULL) {
9096                 /* gak out of memory */
9097                 return;
9098         }
9099 #ifdef SCTP_MBUF_LOGGING
9100         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9101                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9102         }
9103 #endif
9104         chdr = mtod(outchain, struct sctp_chunkhdr *);
9105         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9106         chdr->chunk_flags = 0;
9107         if (chk_length % 4) {
9108                 /* need pad */
9109                 uint32_t cpthis = 0;
9110                 int padlen;
9111
9112                 padlen = 4 - (chk_length % 4);
9113                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9114         }
9115         sctp_alloc_a_chunk(stcb, chk);
9116         if (chk == NULL) {
9117                 /* no memory */
9118                 sctp_m_freem(outchain);
9119                 return;
9120         }
9121         chk->copy_by_ref = 0;
9122         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9123         chk->rec.chunk_id.can_take_data = 1;
9124         chk->flags = 0;
9125         chk->send_size = chk_length;
9126         chk->sent = SCTP_DATAGRAM_UNSENT;
9127         chk->snd_count = 0;
9128         chk->asoc = &stcb->asoc;
9129         chk->data = outchain;
9130         chk->whoTo = net;
9131         atomic_add_int(&chk->whoTo->ref_count, 1);
9132         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9133         chk->asoc->ctrl_queue_cnt++;
9134 }
9135
9136 void
9137 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9138 {
9139         /* formulate and queue a cookie-ack back to sender */
9140         struct mbuf *cookie_ack;
9141         struct sctp_chunkhdr *hdr;
9142         struct sctp_tmit_chunk *chk;
9143
9144         SCTP_TCB_LOCK_ASSERT(stcb);
9145
9146         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9147         if (cookie_ack == NULL) {
9148                 /* no mbuf's */
9149                 return;
9150         }
9151         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9152         sctp_alloc_a_chunk(stcb, chk);
9153         if (chk == NULL) {
9154                 /* no memory */
9155                 sctp_m_freem(cookie_ack);
9156                 return;
9157         }
9158         chk->copy_by_ref = 0;
9159         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9160         chk->rec.chunk_id.can_take_data = 1;
9161         chk->flags = 0;
9162         chk->send_size = sizeof(struct sctp_chunkhdr);
9163         chk->sent = SCTP_DATAGRAM_UNSENT;
9164         chk->snd_count = 0;
9165         chk->asoc = &stcb->asoc;
9166         chk->data = cookie_ack;
9167         if (chk->asoc->last_control_chunk_from != NULL) {
9168                 chk->whoTo = chk->asoc->last_control_chunk_from;
9169                 atomic_add_int(&chk->whoTo->ref_count, 1);
9170         } else {
9171                 chk->whoTo = NULL;
9172         }
9173         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9174         hdr->chunk_type = SCTP_COOKIE_ACK;
9175         hdr->chunk_flags = 0;
9176         hdr->chunk_length = htons(chk->send_size);
9177         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9178         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9179         chk->asoc->ctrl_queue_cnt++;
9180         return;
9181 }
9182
9183
9184 void
9185 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9186 {
9187         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9188         struct mbuf *m_shutdown_ack;
9189         struct sctp_shutdown_ack_chunk *ack_cp;
9190         struct sctp_tmit_chunk *chk;
9191
9192         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9193         if (m_shutdown_ack == NULL) {
9194                 /* no mbuf's */
9195                 return;
9196         }
9197         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9198         sctp_alloc_a_chunk(stcb, chk);
9199         if (chk == NULL) {
9200                 /* no memory */
9201                 sctp_m_freem(m_shutdown_ack);
9202                 return;
9203         }
9204         chk->copy_by_ref = 0;
9205         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9206         chk->rec.chunk_id.can_take_data = 1;
9207         chk->flags = 0;
9208         chk->send_size = sizeof(struct sctp_chunkhdr);
9209         chk->sent = SCTP_DATAGRAM_UNSENT;
9210         chk->snd_count = 0;
9211         chk->flags = 0;
9212         chk->asoc = &stcb->asoc;
9213         chk->data = m_shutdown_ack;
9214         chk->whoTo = net;
9215         if (chk->whoTo) {
9216                 atomic_add_int(&chk->whoTo->ref_count, 1);
9217         }
9218         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9219         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9220         ack_cp->ch.chunk_flags = 0;
9221         ack_cp->ch.chunk_length = htons(chk->send_size);
9222         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9223         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9224         chk->asoc->ctrl_queue_cnt++;
9225         return;
9226 }
9227
9228 void
9229 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9230 {
9231         /* formulate and queue a SHUTDOWN to the sender */
9232         struct mbuf *m_shutdown;
9233         struct sctp_shutdown_chunk *shutdown_cp;
9234         struct sctp_tmit_chunk *chk;
9235
9236         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9237                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9238                         /* We already have a SHUTDOWN queued. Reuse it. */
9239                         if (chk->whoTo) {
9240                                 sctp_free_remote_addr(chk->whoTo);
9241                                 chk->whoTo = NULL;
9242                         }
9243                         break;
9244                 }
9245         }
9246         if (chk == NULL) {
9247                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9248                 if (m_shutdown == NULL) {
9249                         /* no mbuf's */
9250                         return;
9251                 }
9252                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9253                 sctp_alloc_a_chunk(stcb, chk);
9254                 if (chk == NULL) {
9255                         /* no memory */
9256                         sctp_m_freem(m_shutdown);
9257                         return;
9258                 }
9259                 chk->copy_by_ref = 0;
9260                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9261                 chk->rec.chunk_id.can_take_data = 1;
9262                 chk->flags = 0;
9263                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9264                 chk->sent = SCTP_DATAGRAM_UNSENT;
9265                 chk->snd_count = 0;
9266                 chk->flags = 0;
9267                 chk->asoc = &stcb->asoc;
9268                 chk->data = m_shutdown;
9269                 chk->whoTo = net;
9270                 if (chk->whoTo) {
9271                         atomic_add_int(&chk->whoTo->ref_count, 1);
9272                 }
9273                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9274                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9275                 shutdown_cp->ch.chunk_flags = 0;
9276                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9277                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9278                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9279                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9280                 chk->asoc->ctrl_queue_cnt++;
9281         } else {
9282                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9283                 chk->whoTo = net;
9284                 if (chk->whoTo) {
9285                         atomic_add_int(&chk->whoTo->ref_count, 1);
9286                 }
9287                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9288                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9289                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9290         }
9291         return;
9292 }
9293
9294 void
9295 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9296 {
9297         /*
9298          * formulate and queue an ASCONF to the peer. ASCONF parameters
9299          * should be queued on the assoc queue.
9300          */
9301         struct sctp_tmit_chunk *chk;
9302         struct mbuf *m_asconf;
9303         int len;
9304
9305         SCTP_TCB_LOCK_ASSERT(stcb);
9306
9307         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9308             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9309                 /* can't send a new one if there is one in flight already */
9310                 return;
9311         }
9312         /* compose an ASCONF chunk, maximum length is PMTU */
9313         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9314         if (m_asconf == NULL) {
9315                 return;
9316         }
9317         sctp_alloc_a_chunk(stcb, chk);
9318         if (chk == NULL) {
9319                 /* no memory */
9320                 sctp_m_freem(m_asconf);
9321                 return;
9322         }
9323         chk->copy_by_ref = 0;
9324         chk->rec.chunk_id.id = SCTP_ASCONF;
9325         chk->rec.chunk_id.can_take_data = 0;
9326         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9327         chk->data = m_asconf;
9328         chk->send_size = len;
9329         chk->sent = SCTP_DATAGRAM_UNSENT;
9330         chk->snd_count = 0;
9331         chk->asoc = &stcb->asoc;
9332         chk->whoTo = net;
9333         if (chk->whoTo) {
9334                 atomic_add_int(&chk->whoTo->ref_count, 1);
9335         }
9336         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9337         chk->asoc->ctrl_queue_cnt++;
9338         return;
9339 }
9340
9341 void
9342 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9343 {
9344         /*
9345          * formulate and queue a asconf-ack back to sender. the asconf-ack
9346          * must be stored in the tcb.
9347          */
9348         struct sctp_tmit_chunk *chk;
9349         struct sctp_asconf_ack *ack, *latest_ack;
9350         struct mbuf *m_ack;
9351         struct sctp_nets *net = NULL;
9352
9353         SCTP_TCB_LOCK_ASSERT(stcb);
9354         /* Get the latest ASCONF-ACK */
9355         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9356         if (latest_ack == NULL) {
9357                 return;
9358         }
9359         if (latest_ack->last_sent_to != NULL &&
9360             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9361                 /* we're doing a retransmission */
9362                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9363                 if (net == NULL) {
9364                         /* no alternate */
9365                         if (stcb->asoc.last_control_chunk_from == NULL) {
9366                                 if (stcb->asoc.alternate) {
9367                                         net = stcb->asoc.alternate;
9368                                 } else {
9369                                         net = stcb->asoc.primary_destination;
9370                                 }
9371                         } else {
9372                                 net = stcb->asoc.last_control_chunk_from;
9373                         }
9374                 }
9375         } else {
9376                 /* normal case */
9377                 if (stcb->asoc.last_control_chunk_from == NULL) {
9378                         if (stcb->asoc.alternate) {
9379                                 net = stcb->asoc.alternate;
9380                         } else {
9381                                 net = stcb->asoc.primary_destination;
9382                         }
9383                 } else {
9384                         net = stcb->asoc.last_control_chunk_from;
9385                 }
9386         }
9387         latest_ack->last_sent_to = net;
9388
9389         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9390                 if (ack->data == NULL) {
9391                         continue;
9392                 }
9393                 /* copy the asconf_ack */
9394                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9395                 if (m_ack == NULL) {
9396                         /* couldn't copy it */
9397                         return;
9398                 }
9399 #ifdef SCTP_MBUF_LOGGING
9400                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9401                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9402                 }
9403 #endif
9404
9405                 sctp_alloc_a_chunk(stcb, chk);
9406                 if (chk == NULL) {
9407                         /* no memory */
9408                         if (m_ack)
9409                                 sctp_m_freem(m_ack);
9410                         return;
9411                 }
9412                 chk->copy_by_ref = 0;
9413                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9414                 chk->rec.chunk_id.can_take_data = 1;
9415                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9416                 chk->whoTo = net;
9417                 if (chk->whoTo) {
9418                         atomic_add_int(&chk->whoTo->ref_count, 1);
9419                 }
9420                 chk->data = m_ack;
9421                 chk->send_size = ack->len;
9422                 chk->sent = SCTP_DATAGRAM_UNSENT;
9423                 chk->snd_count = 0;
9424                 chk->asoc = &stcb->asoc;
9425
9426                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9427                 chk->asoc->ctrl_queue_cnt++;
9428         }
9429         return;
9430 }
9431
9432
9433 static int
9434 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9435     struct sctp_tcb *stcb,
9436     struct sctp_association *asoc,
9437     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9438 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9439     SCTP_UNUSED
9440 #endif
9441 )
9442 {
9443         /*-
9444          * send out one MTU of retransmission. If fast_retransmit is
9445          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9446          * rwnd. For a Cookie or Asconf in the control chunk queue we
9447          * retransmit them by themselves.
9448          *
9449          * For data chunks we will pick out the lowest TSN's in the sent_queue
9450          * marked for resend and bundle them all together (up to a MTU of
9451          * destination). The address to send to should have been
9452          * selected/changed where the retransmission was marked (i.e. in FR
9453          * or t3-timeout routines).
9454          */
9455         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9456         struct sctp_tmit_chunk *chk, *fwd;
9457         struct mbuf *m, *endofchain;
9458         struct sctp_nets *net = NULL;
9459         uint32_t tsns_sent = 0;
9460         int no_fragmentflg, bundle_at, cnt_thru;
9461         unsigned int mtu;
9462         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9463         struct sctp_auth_chunk *auth = NULL;
9464         uint32_t auth_offset = 0;
9465         uint16_t auth_keyid;
9466         int override_ok = 1;
9467         int data_auth_reqd = 0;
9468         uint32_t dmtu = 0;
9469
9470         SCTP_TCB_LOCK_ASSERT(stcb);
9471         tmr_started = ctl_cnt = bundle_at = error = 0;
9472         no_fragmentflg = 1;
9473         fwd_tsn = 0;
9474         *cnt_out = 0;
9475         fwd = NULL;
9476         endofchain = m = NULL;
9477         auth_keyid = stcb->asoc.authinfo.active_keyid;
9478 #ifdef SCTP_AUDITING_ENABLED
9479         sctp_audit_log(0xC3, 1);
9480 #endif
9481         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9482             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9483                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9484                     asoc->sent_queue_retran_cnt);
9485                 asoc->sent_queue_cnt = 0;
9486                 asoc->sent_queue_cnt_removeable = 0;
9487                 /* send back 0/0 so we enter normal transmission */
9488                 *cnt_out = 0;
9489                 return (0);
9490         }
9491         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9492                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9493                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9494                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9495                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9496                                 continue;
9497                         }
9498                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9499                                 if (chk != asoc->str_reset) {
9500                                         /*
9501                                          * not eligible for retran if its
9502                                          * not ours
9503                                          */
9504                                         continue;
9505                                 }
9506                         }
9507                         ctl_cnt++;
9508                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9509                                 fwd_tsn = 1;
9510                         }
9511                         /*
9512                          * Add an AUTH chunk, if chunk requires it save the
9513                          * offset into the chain for AUTH
9514                          */
9515                         if ((auth == NULL) &&
9516                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9517                             stcb->asoc.peer_auth_chunks))) {
9518                                 m = sctp_add_auth_chunk(m, &endofchain,
9519                                     &auth, &auth_offset,
9520                                     stcb,
9521                                     chk->rec.chunk_id.id);
9522                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9523                         }
9524                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9525                         break;
9526                 }
9527         }
9528         one_chunk = 0;
9529         cnt_thru = 0;
9530         /* do we have control chunks to retransmit? */
9531         if (m != NULL) {
9532                 /* Start a timer no matter if we succeed or fail */
9533                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9534                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9535                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9536                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9537                 chk->snd_count++;       /* update our count */
9538                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9539                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9540                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9541                     no_fragmentflg, 0, 0,
9542                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9543                     chk->whoTo->port, NULL,
9544                     0, 0,
9545                     so_locked))) {
9546                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9547                         if (error == ENOBUFS) {
9548                                 asoc->ifp_had_enobuf = 1;
9549                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9550                         }
9551                         return (error);
9552                 } else {
9553                         asoc->ifp_had_enobuf = 0;
9554                 }
9555                 endofchain = NULL;
9556                 auth = NULL;
9557                 auth_offset = 0;
9558                 /*
9559                  * We don't want to mark the net->sent time here since this
9560                  * we use this for HB and retrans cannot measure RTT
9561                  */
9562                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9563                 *cnt_out += 1;
9564                 chk->sent = SCTP_DATAGRAM_SENT;
9565                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9566                 if (fwd_tsn == 0) {
9567                         return (0);
9568                 } else {
9569                         /* Clean up the fwd-tsn list */
9570                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9571                         return (0);
9572                 }
9573         }
9574         /*
9575          * Ok, it is just data retransmission we need to do or that and a
9576          * fwd-tsn with it all.
9577          */
9578         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9579                 return (SCTP_RETRAN_DONE);
9580         }
9581         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9582             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9583                 /* not yet open, resend the cookie and that is it */
9584                 return (1);
9585         }
9586 #ifdef SCTP_AUDITING_ENABLED
9587         sctp_auditing(20, inp, stcb, NULL);
9588 #endif
9589         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9590         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9591                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9592                         /* No, not sent to this net or not ready for rtx */
9593                         continue;
9594                 }
9595                 if (chk->data == NULL) {
9596                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9597                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9598                         continue;
9599                 }
9600                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9601                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9602                         struct mbuf *op_err;
9603                         char msg[SCTP_DIAG_INFO_LEN];
9604
9605                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9606                             chk->rec.data.tsn, chk->snd_count);
9607                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9608                             msg);
9609                         atomic_add_int(&stcb->asoc.refcnt, 1);
9610                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9611                             so_locked);
9612                         SCTP_TCB_LOCK(stcb);
9613                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9614                         return (SCTP_RETRAN_EXIT);
9615                 }
9616                 /* pick up the net */
9617                 net = chk->whoTo;
9618                 switch (net->ro._l_addr.sa.sa_family) {
9619 #ifdef INET
9620                 case AF_INET:
9621                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9622                         break;
9623 #endif
9624 #ifdef INET6
9625                 case AF_INET6:
9626                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9627                         break;
9628 #endif
9629                 default:
9630                         /* TSNH */
9631                         mtu = net->mtu;
9632                         break;
9633                 }
9634
9635                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9636                         /* No room in peers rwnd */
9637                         uint32_t tsn;
9638
9639                         tsn = asoc->last_acked_seq + 1;
9640                         if (tsn == chk->rec.data.tsn) {
9641                                 /*
9642                                  * we make a special exception for this
9643                                  * case. The peer has no rwnd but is missing
9644                                  * the lowest chunk.. which is probably what
9645                                  * is holding up the rwnd.
9646                                  */
9647                                 goto one_chunk_around;
9648                         }
9649                         return (1);
9650                 }
9651 one_chunk_around:
9652                 if (asoc->peers_rwnd < mtu) {
9653                         one_chunk = 1;
9654                         if ((asoc->peers_rwnd == 0) &&
9655                             (asoc->total_flight == 0)) {
9656                                 chk->window_probe = 1;
9657                                 chk->whoTo->window_probe = 1;
9658                         }
9659                 }
9660 #ifdef SCTP_AUDITING_ENABLED
9661                 sctp_audit_log(0xC3, 2);
9662 #endif
9663                 bundle_at = 0;
9664                 m = NULL;
9665                 net->fast_retran_ip = 0;
9666                 if (chk->rec.data.doing_fast_retransmit == 0) {
9667                         /*
9668                          * if no FR in progress skip destination that have
9669                          * flight_size > cwnd.
9670                          */
9671                         if (net->flight_size >= net->cwnd) {
9672                                 continue;
9673                         }
9674                 } else {
9675                         /*
9676                          * Mark the destination net to have FR recovery
9677                          * limits put on it.
9678                          */
9679                         *fr_done = 1;
9680                         net->fast_retran_ip = 1;
9681                 }
9682
9683                 /*
9684                  * if no AUTH is yet included and this chunk requires it,
9685                  * make sure to account for it.  We don't apply the size
9686                  * until the AUTH chunk is actually added below in case
9687                  * there is no room for this chunk.
9688                  */
9689                 if (data_auth_reqd && (auth == NULL)) {
9690                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9691                 } else
9692                         dmtu = 0;
9693
9694                 if ((chk->send_size <= (mtu - dmtu)) ||
9695                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9696                         /* ok we will add this one */
9697                         if (data_auth_reqd) {
9698                                 if (auth == NULL) {
9699                                         m = sctp_add_auth_chunk(m,
9700                                             &endofchain,
9701                                             &auth,
9702                                             &auth_offset,
9703                                             stcb,
9704                                             SCTP_DATA);
9705                                         auth_keyid = chk->auth_keyid;
9706                                         override_ok = 0;
9707                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9708                                 } else if (override_ok) {
9709                                         auth_keyid = chk->auth_keyid;
9710                                         override_ok = 0;
9711                                 } else if (chk->auth_keyid != auth_keyid) {
9712                                         /* different keyid, so done bundling */
9713                                         break;
9714                                 }
9715                         }
9716                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9717                         if (m == NULL) {
9718                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9719                                 return (ENOMEM);
9720                         }
9721                         /* Do clear IP_DF ? */
9722                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9723                                 no_fragmentflg = 0;
9724                         }
9725                         /* upate our MTU size */
9726                         if (mtu > (chk->send_size + dmtu))
9727                                 mtu -= (chk->send_size + dmtu);
9728                         else
9729                                 mtu = 0;
9730                         data_list[bundle_at++] = chk;
9731                         if (one_chunk && (asoc->total_flight <= 0)) {
9732                                 SCTP_STAT_INCR(sctps_windowprobed);
9733                         }
9734                 }
9735                 if (one_chunk == 0) {
9736                         /*
9737                          * now are there anymore forward from chk to pick
9738                          * up?
9739                          */
9740                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9741                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9742                                         /* Nope, not for retran */
9743                                         continue;
9744                                 }
9745                                 if (fwd->whoTo != net) {
9746                                         /* Nope, not the net in question */
9747                                         continue;
9748                                 }
9749                                 if (data_auth_reqd && (auth == NULL)) {
9750                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9751                                 } else
9752                                         dmtu = 0;
9753                                 if (fwd->send_size <= (mtu - dmtu)) {
9754                                         if (data_auth_reqd) {
9755                                                 if (auth == NULL) {
9756                                                         m = sctp_add_auth_chunk(m,
9757                                                             &endofchain,
9758                                                             &auth,
9759                                                             &auth_offset,
9760                                                             stcb,
9761                                                             SCTP_DATA);
9762                                                         auth_keyid = fwd->auth_keyid;
9763                                                         override_ok = 0;
9764                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9765                                                 } else if (override_ok) {
9766                                                         auth_keyid = fwd->auth_keyid;
9767                                                         override_ok = 0;
9768                                                 } else if (fwd->auth_keyid != auth_keyid) {
9769                                                         /*
9770                                                          * different keyid,
9771                                                          * so done bundling
9772                                                          */
9773                                                         break;
9774                                                 }
9775                                         }
9776                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9777                                         if (m == NULL) {
9778                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9779                                                 return (ENOMEM);
9780                                         }
9781                                         /* Do clear IP_DF ? */
9782                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9783                                                 no_fragmentflg = 0;
9784                                         }
9785                                         /* upate our MTU size */
9786                                         if (mtu > (fwd->send_size + dmtu))
9787                                                 mtu -= (fwd->send_size + dmtu);
9788                                         else
9789                                                 mtu = 0;
9790                                         data_list[bundle_at++] = fwd;
9791                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9792                                                 break;
9793                                         }
9794                                 } else {
9795                                         /* can't fit so we are done */
9796                                         break;
9797                                 }
9798                         }
9799                 }
9800                 /* Is there something to send for this destination? */
9801                 if (m) {
9802                         /*
9803                          * No matter if we fail/or succeed we should start a
9804                          * timer. A failure is like a lost IP packet :-)
9805                          */
9806                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9807                                 /*
9808                                  * no timer running on this destination
9809                                  * restart it.
9810                                  */
9811                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9812                                 tmr_started = 1;
9813                         }
9814                         /* Now lets send it, if there is anything to send :> */
9815                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9816                             (struct sockaddr *)&net->ro._l_addr, m,
9817                             auth_offset, auth, auth_keyid,
9818                             no_fragmentflg, 0, 0,
9819                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9820                             net->port, NULL,
9821                             0, 0,
9822                             so_locked))) {
9823                                 /* error, we could not output */
9824                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9825                                 if (error == ENOBUFS) {
9826                                         asoc->ifp_had_enobuf = 1;
9827                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9828                                 }
9829                                 return (error);
9830                         } else {
9831                                 asoc->ifp_had_enobuf = 0;
9832                         }
9833                         endofchain = NULL;
9834                         auth = NULL;
9835                         auth_offset = 0;
9836                         /* For HB's */
9837                         /*
9838                          * We don't want to mark the net->sent time here
9839                          * since this we use this for HB and retrans cannot
9840                          * measure RTT
9841                          */
9842                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9843
9844                         /* For auto-close */
9845                         cnt_thru++;
9846                         if (*now_filled == 0) {
9847                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9848                                 *now = asoc->time_last_sent;
9849                                 *now_filled = 1;
9850                         } else {
9851                                 asoc->time_last_sent = *now;
9852                         }
9853                         *cnt_out += bundle_at;
9854 #ifdef SCTP_AUDITING_ENABLED
9855                         sctp_audit_log(0xC4, bundle_at);
9856 #endif
9857                         if (bundle_at) {
9858                                 tsns_sent = data_list[0]->rec.data.tsn;
9859                         }
9860                         for (i = 0; i < bundle_at; i++) {
9861                                 SCTP_STAT_INCR(sctps_sendretransdata);
9862                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9863                                 /*
9864                                  * When we have a revoked data, and we
9865                                  * retransmit it, then we clear the revoked
9866                                  * flag since this flag dictates if we
9867                                  * subtracted from the fs
9868                                  */
9869                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9870                                         /* Deflate the cwnd */
9871                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9872                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9873                                 }
9874                                 data_list[i]->snd_count++;
9875                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9876                                 /* record the time */
9877                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9878                                 if (data_list[i]->book_size_scale) {
9879                                         /*
9880                                          * need to double the book size on
9881                                          * this one
9882                                          */
9883                                         data_list[i]->book_size_scale = 0;
9884                                         /*
9885                                          * Since we double the booksize, we
9886                                          * must also double the output queue
9887                                          * size, since this get shrunk when
9888                                          * we free by this amount.
9889                                          */
9890                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9891                                         data_list[i]->book_size *= 2;
9892
9893
9894                                 } else {
9895                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9896                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9897                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9898                                         }
9899                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9900                                             (uint32_t)(data_list[i]->send_size +
9901                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9902                                 }
9903                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9904                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9905                                             data_list[i]->whoTo->flight_size,
9906                                             data_list[i]->book_size,
9907                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9908                                             data_list[i]->rec.data.tsn);
9909                                 }
9910                                 sctp_flight_size_increase(data_list[i]);
9911                                 sctp_total_flight_increase(stcb, data_list[i]);
9912                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9913                                         /* SWS sender side engages */
9914                                         asoc->peers_rwnd = 0;
9915                                 }
9916                                 if ((i == 0) &&
9917                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9918                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9919                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9920                                             (tmr_started == 0)) {
9921                                                 /*-
9922                                                  * ok we just fast-retrans'd
9923                                                  * the lowest TSN, i.e the
9924                                                  * first on the list. In
9925                                                  * this case we want to give
9926                                                  * some more time to get a
9927                                                  * SACK back without a
9928                                                  * t3-expiring.
9929                                                  */
9930                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9931                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9932                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9933                                         }
9934                                 }
9935                         }
9936                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9937                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9938                         }
9939 #ifdef SCTP_AUDITING_ENABLED
9940                         sctp_auditing(21, inp, stcb, NULL);
9941 #endif
9942                 } else {
9943                         /* None will fit */
9944                         return (1);
9945                 }
9946                 if (asoc->sent_queue_retran_cnt <= 0) {
9947                         /* all done we have no more to retran */
9948                         asoc->sent_queue_retran_cnt = 0;
9949                         break;
9950                 }
9951                 if (one_chunk) {
9952                         /* No more room in rwnd */
9953                         return (1);
9954                 }
9955                 /* stop the for loop here. we sent out a packet */
9956                 break;
9957         }
9958         return (0);
9959 }
9960
9961 static void
9962 sctp_timer_validation(struct sctp_inpcb *inp,
9963     struct sctp_tcb *stcb,
9964     struct sctp_association *asoc)
9965 {
9966         struct sctp_nets *net;
9967
9968         /* Validate that a timer is running somewhere */
9969         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9970                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9971                         /* Here is a timer */
9972                         return;
9973                 }
9974         }
9975         SCTP_TCB_LOCK_ASSERT(stcb);
9976         /* Gak, we did not have a timer somewhere */
9977         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9978         if (asoc->alternate) {
9979                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9980         } else {
9981                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9982         }
9983         return;
9984 }
9985
9986 void
9987 sctp_chunk_output(struct sctp_inpcb *inp,
9988     struct sctp_tcb *stcb,
9989     int from_where,
9990     int so_locked
9991 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9992     SCTP_UNUSED
9993 #endif
9994 )
9995 {
9996         /*-
9997          * Ok this is the generic chunk service queue. we must do the
9998          * following:
9999          * - See if there are retransmits pending, if so we must
10000          *   do these first.
10001          * - Service the stream queue that is next, moving any
10002          *   message (note I must get a complete message i.e.
10003          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10004          *   TSN's
10005          * - Check to see if the cwnd/rwnd allows any output, if so we
10006          *   go ahead and fomulate and send the low level chunks. Making sure
10007          *   to combine any control in the control chunk queue also.
10008          */
10009         struct sctp_association *asoc;
10010         struct sctp_nets *net;
10011         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10012         unsigned int burst_cnt = 0;
10013         struct timeval now;
10014         int now_filled = 0;
10015         int nagle_on;
10016         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10017         int un_sent = 0;
10018         int fr_done;
10019         unsigned int tot_frs = 0;
10020
10021         asoc = &stcb->asoc;
10022 do_it_again:
10023         /* The Nagle algorithm is only applied when handling a send call. */
10024         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10025                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10026                         nagle_on = 0;
10027                 } else {
10028                         nagle_on = 1;
10029                 }
10030         } else {
10031                 nagle_on = 0;
10032         }
10033         SCTP_TCB_LOCK_ASSERT(stcb);
10034
10035         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10036
10037         if ((un_sent <= 0) &&
10038             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10039             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10040             (asoc->sent_queue_retran_cnt == 0) &&
10041             (asoc->trigger_reset == 0)) {
10042                 /* Nothing to do unless there is something to be sent left */
10043                 return;
10044         }
10045         /*
10046          * Do we have something to send, data or control AND a sack timer
10047          * running, if so piggy-back the sack.
10048          */
10049         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10050                 sctp_send_sack(stcb, so_locked);
10051                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10052         }
10053         while (asoc->sent_queue_retran_cnt) {
10054                 /*-
10055                  * Ok, it is retransmission time only, we send out only ONE
10056                  * packet with a single call off to the retran code.
10057                  */
10058                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10059                         /*-
10060                          * Special hook for handling cookiess discarded
10061                          * by peer that carried data. Send cookie-ack only
10062                          * and then the next call with get the retran's.
10063                          */
10064                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10065                             from_where,
10066                             &now, &now_filled, frag_point, so_locked);
10067                         return;
10068                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10069                         /* if its not from a HB then do it */
10070                         fr_done = 0;
10071                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10072                         if (fr_done) {
10073                                 tot_frs++;
10074                         }
10075                 } else {
10076                         /*
10077                          * its from any other place, we don't allow retran
10078                          * output (only control)
10079                          */
10080                         ret = 1;
10081                 }
10082                 if (ret > 0) {
10083                         /* Can't send anymore */
10084                         /*-
10085                          * now lets push out control by calling med-level
10086                          * output once. this assures that we WILL send HB's
10087                          * if queued too.
10088                          */
10089                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10090                             from_where,
10091                             &now, &now_filled, frag_point, so_locked);
10092 #ifdef SCTP_AUDITING_ENABLED
10093                         sctp_auditing(8, inp, stcb, NULL);
10094 #endif
10095                         sctp_timer_validation(inp, stcb, asoc);
10096                         return;
10097                 }
10098                 if (ret < 0) {
10099                         /*-
10100                          * The count was off.. retran is not happening so do
10101                          * the normal retransmission.
10102                          */
10103 #ifdef SCTP_AUDITING_ENABLED
10104                         sctp_auditing(9, inp, stcb, NULL);
10105 #endif
10106                         if (ret == SCTP_RETRAN_EXIT) {
10107                                 return;
10108                         }
10109                         break;
10110                 }
10111                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10112                         /* Only one transmission allowed out of a timeout */
10113 #ifdef SCTP_AUDITING_ENABLED
10114                         sctp_auditing(10, inp, stcb, NULL);
10115 #endif
10116                         /* Push out any control */
10117                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10118                             &now, &now_filled, frag_point, so_locked);
10119                         return;
10120                 }
10121                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10122                         /* Hit FR burst limit */
10123                         return;
10124                 }
10125                 if ((num_out == 0) && (ret == 0)) {
10126                         /* No more retrans to send */
10127                         break;
10128                 }
10129         }
10130 #ifdef SCTP_AUDITING_ENABLED
10131         sctp_auditing(12, inp, stcb, NULL);
10132 #endif
10133         /* Check for bad destinations, if they exist move chunks around. */
10134         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10135                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10136                         /*-
10137                          * if possible move things off of this address we
10138                          * still may send below due to the dormant state but
10139                          * we try to find an alternate address to send to
10140                          * and if we have one we move all queued data on the
10141                          * out wheel to this alternate address.
10142                          */
10143                         if (net->ref_count > 1)
10144                                 sctp_move_chunks_from_net(stcb, net);
10145                 } else {
10146                         /*-
10147                          * if ((asoc->sat_network) || (net->addr_is_local))
10148                          * { burst_limit = asoc->max_burst *
10149                          * SCTP_SAT_NETWORK_BURST_INCR; }
10150                          */
10151                         if (asoc->max_burst > 0) {
10152                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10153                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10154                                                 /*
10155                                                  * JRS - Use the congestion
10156                                                  * control given in the
10157                                                  * congestion control module
10158                                                  */
10159                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10160                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10161                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10162                                                 }
10163                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10164                                         }
10165                                         net->fast_retran_ip = 0;
10166                                 } else {
10167                                         if (net->flight_size == 0) {
10168                                                 /*
10169                                                  * Should be decaying the
10170                                                  * cwnd here
10171                                                  */
10172                                                 ;
10173                                         }
10174                                 }
10175                         }
10176                 }
10177
10178         }
10179         burst_cnt = 0;
10180         do {
10181                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10182                     &reason_code, 0, from_where,
10183                     &now, &now_filled, frag_point, so_locked);
10184                 if (error) {
10185                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10186                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10187                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10188                         }
10189                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10190                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10191                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10192                         }
10193                         break;
10194                 }
10195                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10196
10197                 tot_out += num_out;
10198                 burst_cnt++;
10199                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10200                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10201                         if (num_out == 0) {
10202                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10203                         }
10204                 }
10205                 if (nagle_on) {
10206                         /*
10207                          * When the Nagle algorithm is used, look at how
10208                          * much is unsent, then if its smaller than an MTU
10209                          * and we have data in flight we stop, except if we
10210                          * are handling a fragmented user message.
10211                          */
10212                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10213                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10214                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10215                             (stcb->asoc.total_flight > 0)) {
10216 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10217                                 break;
10218                         }
10219                 }
10220                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10221                     TAILQ_EMPTY(&asoc->send_queue) &&
10222                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10223                         /* Nothing left to send */
10224                         break;
10225                 }
10226                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10227                         /* Nothing left to send */
10228                         break;
10229                 }
10230         } while (num_out &&
10231             ((asoc->max_burst == 0) ||
10232             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10233             (burst_cnt < asoc->max_burst)));
10234
10235         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10236                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10237                         SCTP_STAT_INCR(sctps_maxburstqueued);
10238                         asoc->burst_limit_applied = 1;
10239                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10240                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10241                         }
10242                 } else {
10243                         asoc->burst_limit_applied = 0;
10244                 }
10245         }
10246         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10247                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10248         }
10249         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10250             tot_out);
10251
10252         /*-
10253          * Now we need to clean up the control chunk chain if a ECNE is on
10254          * it. It must be marked as UNSENT again so next call will continue
10255          * to send it until such time that we get a CWR, to remove it.
10256          */
10257         if (stcb->asoc.ecn_echo_cnt_onq)
10258                 sctp_fix_ecn_echo(asoc);
10259
10260         if (stcb->asoc.trigger_reset) {
10261                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10262                         goto do_it_again;
10263                 }
10264         }
10265         return;
10266 }
10267
10268
10269 int
10270 sctp_output(
10271     struct sctp_inpcb *inp,
10272     struct mbuf *m,
10273     struct sockaddr *addr,
10274     struct mbuf *control,
10275     struct thread *p,
10276     int flags)
10277 {
10278         if (inp == NULL) {
10279                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10280                 return (EINVAL);
10281         }
10282         if (inp->sctp_socket == NULL) {
10283                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10284                 return (EINVAL);
10285         }
10286         return (sctp_sosend(inp->sctp_socket,
10287             addr,
10288             (struct uio *)NULL,
10289             m,
10290             control,
10291             flags, p
10292             ));
10293 }
10294
10295 void
10296 send_forward_tsn(struct sctp_tcb *stcb,
10297     struct sctp_association *asoc)
10298 {
10299         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10300         struct sctp_forward_tsn_chunk *fwdtsn;
10301         struct sctp_strseq *strseq;
10302         struct sctp_strseq_mid *strseq_m;
10303         uint32_t advance_peer_ack_point;
10304         unsigned int cnt_of_space, i, ovh;
10305         unsigned int space_needed;
10306         unsigned int cnt_of_skipped = 0;
10307
10308         SCTP_TCB_LOCK_ASSERT(stcb);
10309         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10310                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10311                         /* mark it to unsent */
10312                         chk->sent = SCTP_DATAGRAM_UNSENT;
10313                         chk->snd_count = 0;
10314                         /* Do we correct its output location? */
10315                         if (chk->whoTo) {
10316                                 sctp_free_remote_addr(chk->whoTo);
10317                                 chk->whoTo = NULL;
10318                         }
10319                         goto sctp_fill_in_rest;
10320                 }
10321         }
10322         /* Ok if we reach here we must build one */
10323         sctp_alloc_a_chunk(stcb, chk);
10324         if (chk == NULL) {
10325                 return;
10326         }
10327         asoc->fwd_tsn_cnt++;
10328         chk->copy_by_ref = 0;
10329         /*
10330          * We don't do the old thing here since this is used not for on-wire
10331          * but to tell if we are sending a fwd-tsn by the stack during
10332          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10333          */
10334         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10335         chk->rec.chunk_id.can_take_data = 0;
10336         chk->flags = 0;
10337         chk->asoc = asoc;
10338         chk->whoTo = NULL;
10339         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10340         if (chk->data == NULL) {
10341                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10342                 return;
10343         }
10344         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10345         chk->sent = SCTP_DATAGRAM_UNSENT;
10346         chk->snd_count = 0;
10347         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10348         asoc->ctrl_queue_cnt++;
10349 sctp_fill_in_rest:
10350         /*-
10351          * Here we go through and fill out the part that deals with
10352          * stream/seq of the ones we skip.
10353          */
10354         SCTP_BUF_LEN(chk->data) = 0;
10355         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10356                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10357                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10358                         /* no more to look at */
10359                         break;
10360                 }
10361                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10362                         /* We don't report these */
10363                         continue;
10364                 }
10365                 cnt_of_skipped++;
10366         }
10367         if (asoc->idata_supported) {
10368                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10369                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10370         } else {
10371                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10372                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10373         }
10374         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10375
10376         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10377                 ovh = SCTP_MIN_OVERHEAD;
10378         } else {
10379                 ovh = SCTP_MIN_V4_OVERHEAD;
10380         }
10381         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10382                 /* trim to a mtu size */
10383                 cnt_of_space = asoc->smallest_mtu - ovh;
10384         }
10385         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10386                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10387                     0xff, 0, cnt_of_skipped,
10388                     asoc->advanced_peer_ack_point);
10389         }
10390         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10391         if (cnt_of_space < space_needed) {
10392                 /*-
10393                  * ok we must trim down the chunk by lowering the
10394                  * advance peer ack point.
10395                  */
10396                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10397                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10398                             0xff, 0xff, cnt_of_space,
10399                             space_needed);
10400                 }
10401                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10402                 if (asoc->idata_supported) {
10403                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10404                 } else {
10405                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10406                 }
10407                 /*-
10408                  * Go through and find the TSN that will be the one
10409                  * we report.
10410                  */
10411                 at = TAILQ_FIRST(&asoc->sent_queue);
10412                 if (at != NULL) {
10413                         for (i = 0; i < cnt_of_skipped; i++) {
10414                                 tp1 = TAILQ_NEXT(at, sctp_next);
10415                                 if (tp1 == NULL) {
10416                                         break;
10417                                 }
10418                                 at = tp1;
10419                         }
10420                 }
10421                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10422                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10423                             0xff, cnt_of_skipped, at->rec.data.tsn,
10424                             asoc->advanced_peer_ack_point);
10425                 }
10426                 last = at;
10427                 /*-
10428                  * last now points to last one I can report, update
10429                  * peer ack point
10430                  */
10431                 if (last) {
10432                         advance_peer_ack_point = last->rec.data.tsn;
10433                 }
10434                 if (asoc->idata_supported) {
10435                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10436                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10437                 } else {
10438                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10439                             cnt_of_skipped * sizeof(struct sctp_strseq);
10440                 }
10441         }
10442         chk->send_size = space_needed;
10443         /* Setup the chunk */
10444         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10445         fwdtsn->ch.chunk_length = htons(chk->send_size);
10446         fwdtsn->ch.chunk_flags = 0;
10447         if (asoc->idata_supported) {
10448                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10449         } else {
10450                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10451         }
10452         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10453         SCTP_BUF_LEN(chk->data) = chk->send_size;
10454         fwdtsn++;
10455         /*-
10456          * Move pointer to after the fwdtsn and transfer to the
10457          * strseq pointer.
10458          */
10459         if (asoc->idata_supported) {
10460                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10461                 strseq = NULL;
10462         } else {
10463                 strseq = (struct sctp_strseq *)fwdtsn;
10464                 strseq_m = NULL;
10465         }
10466         /*-
10467          * Now populate the strseq list. This is done blindly
10468          * without pulling out duplicate stream info. This is
10469          * inefficent but won't harm the process since the peer will
10470          * look at these in sequence and will thus release anything.
10471          * It could mean we exceed the PMTU and chop off some that
10472          * we could have included.. but this is unlikely (aka 1432/4
10473          * would mean 300+ stream seq's would have to be reported in
10474          * one FWD-TSN. With a bit of work we can later FIX this to
10475          * optimize and pull out duplicates.. but it does add more
10476          * overhead. So for now... not!
10477          */
10478         i = 0;
10479         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10480                 if (i >= cnt_of_skipped) {
10481                         break;
10482                 }
10483                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10484                         /* We don't report these */
10485                         continue;
10486                 }
10487                 if (at->rec.data.tsn == advance_peer_ack_point) {
10488                         at->rec.data.fwd_tsn_cnt = 0;
10489                 }
10490                 if (asoc->idata_supported) {
10491                         strseq_m->sid = htons(at->rec.data.sid);
10492                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10493                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10494                         } else {
10495                                 strseq_m->flags = 0;
10496                         }
10497                         strseq_m->mid = htonl(at->rec.data.mid);
10498                         strseq_m++;
10499                 } else {
10500                         strseq->sid = htons(at->rec.data.sid);
10501                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10502                         strseq++;
10503                 }
10504                 i++;
10505         }
10506         return;
10507 }
10508
10509 void
10510 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10511 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10512     SCTP_UNUSED
10513 #endif
10514 )
10515 {
10516         /*-
10517          * Queue up a SACK or NR-SACK in the control queue.
10518          * We must first check to see if a SACK or NR-SACK is
10519          * somehow on the control queue.
10520          * If so, we will take and and remove the old one.
10521          */
10522         struct sctp_association *asoc;
10523         struct sctp_tmit_chunk *chk, *a_chk;
10524         struct sctp_sack_chunk *sack;
10525         struct sctp_nr_sack_chunk *nr_sack;
10526         struct sctp_gap_ack_block *gap_descriptor;
10527         const struct sack_track *selector;
10528         int mergeable = 0;
10529         int offset;
10530         caddr_t limit;
10531         uint32_t *dup;
10532         int limit_reached = 0;
10533         unsigned int i, siz, j;
10534         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10535         int num_dups = 0;
10536         int space_req;
10537         uint32_t highest_tsn;
10538         uint8_t flags;
10539         uint8_t type;
10540         uint8_t tsn_map;
10541
10542         if (stcb->asoc.nrsack_supported == 1) {
10543                 type = SCTP_NR_SELECTIVE_ACK;
10544         } else {
10545                 type = SCTP_SELECTIVE_ACK;
10546         }
10547         a_chk = NULL;
10548         asoc = &stcb->asoc;
10549         SCTP_TCB_LOCK_ASSERT(stcb);
10550         if (asoc->last_data_chunk_from == NULL) {
10551                 /* Hmm we never received anything */
10552                 return;
10553         }
10554         sctp_slide_mapping_arrays(stcb);
10555         sctp_set_rwnd(stcb, asoc);
10556         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10557                 if (chk->rec.chunk_id.id == type) {
10558                         /* Hmm, found a sack already on queue, remove it */
10559                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10560                         asoc->ctrl_queue_cnt--;
10561                         a_chk = chk;
10562                         if (a_chk->data) {
10563                                 sctp_m_freem(a_chk->data);
10564                                 a_chk->data = NULL;
10565                         }
10566                         if (a_chk->whoTo) {
10567                                 sctp_free_remote_addr(a_chk->whoTo);
10568                                 a_chk->whoTo = NULL;
10569                         }
10570                         break;
10571                 }
10572         }
10573         if (a_chk == NULL) {
10574                 sctp_alloc_a_chunk(stcb, a_chk);
10575                 if (a_chk == NULL) {
10576                         /* No memory so we drop the idea, and set a timer */
10577                         if (stcb->asoc.delayed_ack) {
10578                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10579                                     stcb->sctp_ep, stcb, NULL,
10580                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10581                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10582                                     stcb->sctp_ep, stcb, NULL);
10583                         } else {
10584                                 stcb->asoc.send_sack = 1;
10585                         }
10586                         return;
10587                 }
10588                 a_chk->copy_by_ref = 0;
10589                 a_chk->rec.chunk_id.id = type;
10590                 a_chk->rec.chunk_id.can_take_data = 1;
10591         }
10592         /* Clear our pkt counts */
10593         asoc->data_pkts_seen = 0;
10594
10595         a_chk->flags = 0;
10596         a_chk->asoc = asoc;
10597         a_chk->snd_count = 0;
10598         a_chk->send_size = 0;   /* fill in later */
10599         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10600         a_chk->whoTo = NULL;
10601
10602         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10603                 /*-
10604                  * Ok, the destination for the SACK is unreachable, lets see if
10605                  * we can select an alternate to asoc->last_data_chunk_from
10606                  */
10607                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10608                 if (a_chk->whoTo == NULL) {
10609                         /* Nope, no alternate */
10610                         a_chk->whoTo = asoc->last_data_chunk_from;
10611                 }
10612         } else {
10613                 a_chk->whoTo = asoc->last_data_chunk_from;
10614         }
10615         if (a_chk->whoTo) {
10616                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10617         }
10618         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10619                 highest_tsn = asoc->highest_tsn_inside_map;
10620         } else {
10621                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10622         }
10623         if (highest_tsn == asoc->cumulative_tsn) {
10624                 /* no gaps */
10625                 if (type == SCTP_SELECTIVE_ACK) {
10626                         space_req = sizeof(struct sctp_sack_chunk);
10627                 } else {
10628                         space_req = sizeof(struct sctp_nr_sack_chunk);
10629                 }
10630         } else {
10631                 /* gaps get a cluster */
10632                 space_req = MCLBYTES;
10633         }
10634         /* Ok now lets formulate a MBUF with our sack */
10635         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10636         if ((a_chk->data == NULL) ||
10637             (a_chk->whoTo == NULL)) {
10638                 /* rats, no mbuf memory */
10639                 if (a_chk->data) {
10640                         /* was a problem with the destination */
10641                         sctp_m_freem(a_chk->data);
10642                         a_chk->data = NULL;
10643                 }
10644                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10645                 /* sa_ignore NO_NULL_CHK */
10646                 if (stcb->asoc.delayed_ack) {
10647                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10648                             stcb->sctp_ep, stcb, NULL,
10649                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10650                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10651                             stcb->sctp_ep, stcb, NULL);
10652                 } else {
10653                         stcb->asoc.send_sack = 1;
10654                 }
10655                 return;
10656         }
10657         /* ok, lets go through and fill it in */
10658         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10659         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10660         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10661                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10662         }
10663         limit = mtod(a_chk->data, caddr_t);
10664         limit += space;
10665
10666         flags = 0;
10667
10668         if ((asoc->sctp_cmt_on_off > 0) &&
10669             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10670                 /*-
10671                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10672                  * received, then set high bit to 1, else 0. Reset
10673                  * pkts_rcvd.
10674                  */
10675                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10676                 asoc->cmt_dac_pkts_rcvd = 0;
10677         }
10678 #ifdef SCTP_ASOCLOG_OF_TSNS
10679         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10680         stcb->asoc.cumack_log_atsnt++;
10681         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10682                 stcb->asoc.cumack_log_atsnt = 0;
10683         }
10684 #endif
10685         /* reset the readers interpretation */
10686         stcb->freed_by_sorcv_sincelast = 0;
10687
10688         if (type == SCTP_SELECTIVE_ACK) {
10689                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10690                 nr_sack = NULL;
10691                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10692                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10693                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10694                 } else {
10695                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10696                 }
10697         } else {
10698                 sack = NULL;
10699                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10700                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10701                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10702                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10703                 } else {
10704                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10705                 }
10706         }
10707
10708         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10709                 offset = 1;
10710         } else {
10711                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10712         }
10713         if (((type == SCTP_SELECTIVE_ACK) &&
10714             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10715             ((type == SCTP_NR_SELECTIVE_ACK) &&
10716             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10717                 /* we have a gap .. maybe */
10718                 for (i = 0; i < siz; i++) {
10719                         tsn_map = asoc->mapping_array[i];
10720                         if (type == SCTP_SELECTIVE_ACK) {
10721                                 tsn_map |= asoc->nr_mapping_array[i];
10722                         }
10723                         if (i == 0) {
10724                                 /*
10725                                  * Clear all bits corresponding to TSNs
10726                                  * smaller or equal to the cumulative TSN.
10727                                  */
10728                                 tsn_map &= (~0U << (1 - offset));
10729                         }
10730                         selector = &sack_array[tsn_map];
10731                         if (mergeable && selector->right_edge) {
10732                                 /*
10733                                  * Backup, left and right edges were ok to
10734                                  * merge.
10735                                  */
10736                                 num_gap_blocks--;
10737                                 gap_descriptor--;
10738                         }
10739                         if (selector->num_entries == 0)
10740                                 mergeable = 0;
10741                         else {
10742                                 for (j = 0; j < selector->num_entries; j++) {
10743                                         if (mergeable && selector->right_edge) {
10744                                                 /*
10745                                                  * do a merge by NOT setting
10746                                                  * the left side
10747                                                  */
10748                                                 mergeable = 0;
10749                                         } else {
10750                                                 /*
10751                                                  * no merge, set the left
10752                                                  * side
10753                                                  */
10754                                                 mergeable = 0;
10755                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10756                                         }
10757                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10758                                         num_gap_blocks++;
10759                                         gap_descriptor++;
10760                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10761                                                 /* no more room */
10762                                                 limit_reached = 1;
10763                                                 break;
10764                                         }
10765                                 }
10766                                 if (selector->left_edge) {
10767                                         mergeable = 1;
10768                                 }
10769                         }
10770                         if (limit_reached) {
10771                                 /* Reached the limit stop */
10772                                 break;
10773                         }
10774                         offset += 8;
10775                 }
10776         }
10777         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10778             (limit_reached == 0)) {
10779
10780                 mergeable = 0;
10781
10782                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10783                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10784                 } else {
10785                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10786                 }
10787
10788                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10789                         offset = 1;
10790                 } else {
10791                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10792                 }
10793                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10794                         /* we have a gap .. maybe */
10795                         for (i = 0; i < siz; i++) {
10796                                 tsn_map = asoc->nr_mapping_array[i];
10797                                 if (i == 0) {
10798                                         /*
10799                                          * Clear all bits corresponding to
10800                                          * TSNs smaller or equal to the
10801                                          * cumulative TSN.
10802                                          */
10803                                         tsn_map &= (~0U << (1 - offset));
10804                                 }
10805                                 selector = &sack_array[tsn_map];
10806                                 if (mergeable && selector->right_edge) {
10807                                         /*
10808                                          * Backup, left and right edges were
10809                                          * ok to merge.
10810                                          */
10811                                         num_nr_gap_blocks--;
10812                                         gap_descriptor--;
10813                                 }
10814                                 if (selector->num_entries == 0)
10815                                         mergeable = 0;
10816                                 else {
10817                                         for (j = 0; j < selector->num_entries; j++) {
10818                                                 if (mergeable && selector->right_edge) {
10819                                                         /*
10820                                                          * do a merge by NOT
10821                                                          * setting the left
10822                                                          * side
10823                                                          */
10824                                                         mergeable = 0;
10825                                                 } else {
10826                                                         /*
10827                                                          * no merge, set the
10828                                                          * left side
10829                                                          */
10830                                                         mergeable = 0;
10831                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10832                                                 }
10833                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10834                                                 num_nr_gap_blocks++;
10835                                                 gap_descriptor++;
10836                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10837                                                         /* no more room */
10838                                                         limit_reached = 1;
10839                                                         break;
10840                                                 }
10841                                         }
10842                                         if (selector->left_edge) {
10843                                                 mergeable = 1;
10844                                         }
10845                                 }
10846                                 if (limit_reached) {
10847                                         /* Reached the limit stop */
10848                                         break;
10849                                 }
10850                                 offset += 8;
10851                         }
10852                 }
10853         }
10854         /* now we must add any dups we are going to report. */
10855         if ((limit_reached == 0) && (asoc->numduptsns)) {
10856                 dup = (uint32_t *)gap_descriptor;
10857                 for (i = 0; i < asoc->numduptsns; i++) {
10858                         *dup = htonl(asoc->dup_tsns[i]);
10859                         dup++;
10860                         num_dups++;
10861                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10862                                 /* no more room */
10863                                 break;
10864                         }
10865                 }
10866                 asoc->numduptsns = 0;
10867         }
10868         /*
10869          * now that the chunk is prepared queue it to the control chunk
10870          * queue.
10871          */
10872         if (type == SCTP_SELECTIVE_ACK) {
10873                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10874                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10875                     num_dups * sizeof(int32_t));
10876                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10877                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10878                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10879                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10880                 sack->sack.num_dup_tsns = htons(num_dups);
10881                 sack->ch.chunk_type = type;
10882                 sack->ch.chunk_flags = flags;
10883                 sack->ch.chunk_length = htons(a_chk->send_size);
10884         } else {
10885                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10886                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10887                     num_dups * sizeof(int32_t));
10888                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10889                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10890                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10891                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10892                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10893                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10894                 nr_sack->nr_sack.reserved = 0;
10895                 nr_sack->ch.chunk_type = type;
10896                 nr_sack->ch.chunk_flags = flags;
10897                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10898         }
10899         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10900         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10901         asoc->ctrl_queue_cnt++;
10902         asoc->send_sack = 0;
10903         SCTP_STAT_INCR(sctps_sendsacks);
10904         return;
10905 }
10906
10907 void
10908 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10909 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10910     SCTP_UNUSED
10911 #endif
10912 )
10913 {
10914         struct mbuf *m_abort, *m, *m_last;
10915         struct mbuf *m_out, *m_end = NULL;
10916         struct sctp_abort_chunk *abort;
10917         struct sctp_auth_chunk *auth = NULL;
10918         struct sctp_nets *net;
10919         uint32_t vtag;
10920         uint32_t auth_offset = 0;
10921         int error;
10922         uint16_t cause_len, chunk_len, padding_len;
10923
10924         SCTP_TCB_LOCK_ASSERT(stcb);
10925         /*-
10926          * Add an AUTH chunk, if chunk requires it and save the offset into
10927          * the chain for AUTH
10928          */
10929         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10930             stcb->asoc.peer_auth_chunks)) {
10931                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10932                     stcb, SCTP_ABORT_ASSOCIATION);
10933                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10934         } else {
10935                 m_out = NULL;
10936         }
10937         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10938         if (m_abort == NULL) {
10939                 if (m_out) {
10940                         sctp_m_freem(m_out);
10941                 }
10942                 if (operr) {
10943                         sctp_m_freem(operr);
10944                 }
10945                 return;
10946         }
10947         /* link in any error */
10948         SCTP_BUF_NEXT(m_abort) = operr;
10949         cause_len = 0;
10950         m_last = NULL;
10951         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10952                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10953                 if (SCTP_BUF_NEXT(m) == NULL) {
10954                         m_last = m;
10955                 }
10956         }
10957         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10958         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10959         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10960         if (m_out == NULL) {
10961                 /* NO Auth chunk prepended, so reserve space in front */
10962                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10963                 m_out = m_abort;
10964         } else {
10965                 /* Put AUTH chunk at the front of the chain */
10966                 SCTP_BUF_NEXT(m_end) = m_abort;
10967         }
10968         if (stcb->asoc.alternate) {
10969                 net = stcb->asoc.alternate;
10970         } else {
10971                 net = stcb->asoc.primary_destination;
10972         }
10973         /* Fill in the ABORT chunk header. */
10974         abort = mtod(m_abort, struct sctp_abort_chunk *);
10975         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10976         if (stcb->asoc.peer_vtag == 0) {
10977                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10978                 vtag = stcb->asoc.my_vtag;
10979                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10980         } else {
10981                 vtag = stcb->asoc.peer_vtag;
10982                 abort->ch.chunk_flags = 0;
10983         }
10984         abort->ch.chunk_length = htons(chunk_len);
10985         /* Add padding, if necessary. */
10986         if (padding_len > 0) {
10987                 if ((m_last == NULL) ||
10988                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10989                         sctp_m_freem(m_out);
10990                         return;
10991                 }
10992         }
10993         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10994             (struct sockaddr *)&net->ro._l_addr,
10995             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10996             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10997             stcb->asoc.primary_destination->port, NULL,
10998             0, 0,
10999             so_locked))) {
11000                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11001                 if (error == ENOBUFS) {
11002                         stcb->asoc.ifp_had_enobuf = 1;
11003                         SCTP_STAT_INCR(sctps_lowlevelerr);
11004                 }
11005         } else {
11006                 stcb->asoc.ifp_had_enobuf = 0;
11007         }
11008         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11009 }
11010
11011 void
11012 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11013     struct sctp_nets *net,
11014     int reflect_vtag)
11015 {
11016         /* formulate and SEND a SHUTDOWN-COMPLETE */
11017         struct mbuf *m_shutdown_comp;
11018         struct sctp_shutdown_complete_chunk *shutdown_complete;
11019         uint32_t vtag;
11020         int error;
11021         uint8_t flags;
11022
11023         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11024         if (m_shutdown_comp == NULL) {
11025                 /* no mbuf's */
11026                 return;
11027         }
11028         if (reflect_vtag) {
11029                 flags = SCTP_HAD_NO_TCB;
11030                 vtag = stcb->asoc.my_vtag;
11031         } else {
11032                 flags = 0;
11033                 vtag = stcb->asoc.peer_vtag;
11034         }
11035         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11036         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11037         shutdown_complete->ch.chunk_flags = flags;
11038         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11039         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11040         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11041             (struct sockaddr *)&net->ro._l_addr,
11042             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11043             stcb->sctp_ep->sctp_lport, stcb->rport,
11044             htonl(vtag),
11045             net->port, NULL,
11046             0, 0,
11047             SCTP_SO_NOT_LOCKED))) {
11048                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11049                 if (error == ENOBUFS) {
11050                         stcb->asoc.ifp_had_enobuf = 1;
11051                         SCTP_STAT_INCR(sctps_lowlevelerr);
11052                 }
11053         } else {
11054                 stcb->asoc.ifp_had_enobuf = 0;
11055         }
11056         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11057         return;
11058 }
11059
11060 static void
11061 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11062     struct sctphdr *sh, uint32_t vtag,
11063     uint8_t type, struct mbuf *cause,
11064     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11065     uint32_t vrf_id, uint16_t port)
11066 {
11067         struct mbuf *o_pak;
11068         struct mbuf *mout;
11069         struct sctphdr *shout;
11070         struct sctp_chunkhdr *ch;
11071 #if defined(INET) || defined(INET6)
11072         struct udphdr *udp;
11073         int ret;
11074 #endif
11075         int len, cause_len, padding_len;
11076 #ifdef INET
11077         struct sockaddr_in *src_sin, *dst_sin;
11078         struct ip *ip;
11079 #endif
11080 #ifdef INET6
11081         struct sockaddr_in6 *src_sin6, *dst_sin6;
11082         struct ip6_hdr *ip6;
11083 #endif
11084
11085         /* Compute the length of the cause and add final padding. */
11086         cause_len = 0;
11087         if (cause != NULL) {
11088                 struct mbuf *m_at, *m_last = NULL;
11089
11090                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11091                         if (SCTP_BUF_NEXT(m_at) == NULL)
11092                                 m_last = m_at;
11093                         cause_len += SCTP_BUF_LEN(m_at);
11094                 }
11095                 padding_len = cause_len % 4;
11096                 if (padding_len != 0) {
11097                         padding_len = 4 - padding_len;
11098                 }
11099                 if (padding_len != 0) {
11100                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11101                                 sctp_m_freem(cause);
11102                                 return;
11103                         }
11104                 }
11105         } else {
11106                 padding_len = 0;
11107         }
11108         /* Get an mbuf for the header. */
11109         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11110         switch (dst->sa_family) {
11111 #ifdef INET
11112         case AF_INET:
11113                 len += sizeof(struct ip);
11114                 break;
11115 #endif
11116 #ifdef INET6
11117         case AF_INET6:
11118                 len += sizeof(struct ip6_hdr);
11119                 break;
11120 #endif
11121         default:
11122                 break;
11123         }
11124 #if defined(INET) || defined(INET6)
11125         if (port) {
11126                 len += sizeof(struct udphdr);
11127         }
11128 #endif
11129         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11130         if (mout == NULL) {
11131                 if (cause) {
11132                         sctp_m_freem(cause);
11133                 }
11134                 return;
11135         }
11136         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11137         SCTP_BUF_LEN(mout) = len;
11138         SCTP_BUF_NEXT(mout) = cause;
11139         M_SETFIB(mout, fibnum);
11140         mout->m_pkthdr.flowid = mflowid;
11141         M_HASHTYPE_SET(mout, mflowtype);
11142 #ifdef INET
11143         ip = NULL;
11144 #endif
11145 #ifdef INET6
11146         ip6 = NULL;
11147 #endif
11148         switch (dst->sa_family) {
11149 #ifdef INET
11150         case AF_INET:
11151                 src_sin = (struct sockaddr_in *)src;
11152                 dst_sin = (struct sockaddr_in *)dst;
11153                 ip = mtod(mout, struct ip *);
11154                 ip->ip_v = IPVERSION;
11155                 ip->ip_hl = (sizeof(struct ip) >> 2);
11156                 ip->ip_tos = 0;
11157                 ip->ip_off = htons(IP_DF);
11158                 ip_fillid(ip);
11159                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11160                 if (port) {
11161                         ip->ip_p = IPPROTO_UDP;
11162                 } else {
11163                         ip->ip_p = IPPROTO_SCTP;
11164                 }
11165                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11166                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11167                 ip->ip_sum = 0;
11168                 len = sizeof(struct ip);
11169                 shout = (struct sctphdr *)((caddr_t)ip + len);
11170                 break;
11171 #endif
11172 #ifdef INET6
11173         case AF_INET6:
11174                 src_sin6 = (struct sockaddr_in6 *)src;
11175                 dst_sin6 = (struct sockaddr_in6 *)dst;
11176                 ip6 = mtod(mout, struct ip6_hdr *);
11177                 ip6->ip6_flow = htonl(0x60000000);
11178                 if (V_ip6_auto_flowlabel) {
11179                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11180                 }
11181                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11182                 if (port) {
11183                         ip6->ip6_nxt = IPPROTO_UDP;
11184                 } else {
11185                         ip6->ip6_nxt = IPPROTO_SCTP;
11186                 }
11187                 ip6->ip6_src = dst_sin6->sin6_addr;
11188                 ip6->ip6_dst = src_sin6->sin6_addr;
11189                 len = sizeof(struct ip6_hdr);
11190                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11191                 break;
11192 #endif
11193         default:
11194                 len = 0;
11195                 shout = mtod(mout, struct sctphdr *);
11196                 break;
11197         }
11198 #if defined(INET) || defined(INET6)
11199         if (port) {
11200                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11201                         sctp_m_freem(mout);
11202                         return;
11203                 }
11204                 udp = (struct udphdr *)shout;
11205                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11206                 udp->uh_dport = port;
11207                 udp->uh_sum = 0;
11208                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11209                     sizeof(struct sctphdr) +
11210                     sizeof(struct sctp_chunkhdr) +
11211                     cause_len + padding_len));
11212                 len += sizeof(struct udphdr);
11213                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11214         } else {
11215                 udp = NULL;
11216         }
11217 #endif
11218         shout->src_port = sh->dest_port;
11219         shout->dest_port = sh->src_port;
11220         shout->checksum = 0;
11221         if (vtag) {
11222                 shout->v_tag = htonl(vtag);
11223         } else {
11224                 shout->v_tag = sh->v_tag;
11225         }
11226         len += sizeof(struct sctphdr);
11227         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11228         ch->chunk_type = type;
11229         if (vtag) {
11230                 ch->chunk_flags = 0;
11231         } else {
11232                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11233         }
11234         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11235         len += sizeof(struct sctp_chunkhdr);
11236         len += cause_len + padding_len;
11237
11238         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11239                 sctp_m_freem(mout);
11240                 return;
11241         }
11242         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11243         switch (dst->sa_family) {
11244 #ifdef INET
11245         case AF_INET:
11246                 if (port) {
11247                         if (V_udp_cksum) {
11248                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11249                         } else {
11250                                 udp->uh_sum = 0;
11251                         }
11252                 }
11253                 ip->ip_len = htons(len);
11254                 if (port) {
11255 #if defined(SCTP_WITH_NO_CSUM)
11256                         SCTP_STAT_INCR(sctps_sendnocrc);
11257 #else
11258                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11259                         SCTP_STAT_INCR(sctps_sendswcrc);
11260 #endif
11261                         if (V_udp_cksum) {
11262                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11263                         }
11264                 } else {
11265 #if defined(SCTP_WITH_NO_CSUM)
11266                         SCTP_STAT_INCR(sctps_sendnocrc);
11267 #else
11268                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11269                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11270                         SCTP_STAT_INCR(sctps_sendhwcrc);
11271 #endif
11272                 }
11273 #ifdef SCTP_PACKET_LOGGING
11274                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11275                         sctp_packet_log(o_pak);
11276                 }
11277 #endif
11278                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11279                 break;
11280 #endif
11281 #ifdef INET6
11282         case AF_INET6:
11283                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11284                 if (port) {
11285 #if defined(SCTP_WITH_NO_CSUM)
11286                         SCTP_STAT_INCR(sctps_sendnocrc);
11287 #else
11288                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11289                         SCTP_STAT_INCR(sctps_sendswcrc);
11290 #endif
11291                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11292                                 udp->uh_sum = 0xffff;
11293                         }
11294                 } else {
11295 #if defined(SCTP_WITH_NO_CSUM)
11296                         SCTP_STAT_INCR(sctps_sendnocrc);
11297 #else
11298                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11299                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11300                         SCTP_STAT_INCR(sctps_sendhwcrc);
11301 #endif
11302                 }
11303 #ifdef SCTP_PACKET_LOGGING
11304                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11305                         sctp_packet_log(o_pak);
11306                 }
11307 #endif
11308                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11309                 break;
11310 #endif
11311         default:
11312                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11313                     dst->sa_family);
11314                 sctp_m_freem(mout);
11315                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11316                 return;
11317         }
11318         SCTP_STAT_INCR(sctps_sendpackets);
11319         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11320         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11321         return;
11322 }
11323
11324 void
11325 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11326     struct sctphdr *sh,
11327     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11328     uint32_t vrf_id, uint16_t port)
11329 {
11330         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11331             mflowtype, mflowid, fibnum,
11332             vrf_id, port);
11333 }
11334
11335 void
11336 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11337 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11338     SCTP_UNUSED
11339 #endif
11340 )
11341 {
11342         struct sctp_tmit_chunk *chk;
11343         struct sctp_heartbeat_chunk *hb;
11344         struct timeval now;
11345
11346         SCTP_TCB_LOCK_ASSERT(stcb);
11347         if (net == NULL) {
11348                 return;
11349         }
11350         (void)SCTP_GETTIME_TIMEVAL(&now);
11351         switch (net->ro._l_addr.sa.sa_family) {
11352 #ifdef INET
11353         case AF_INET:
11354                 break;
11355 #endif
11356 #ifdef INET6
11357         case AF_INET6:
11358                 break;
11359 #endif
11360         default:
11361                 return;
11362         }
11363         sctp_alloc_a_chunk(stcb, chk);
11364         if (chk == NULL) {
11365                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11366                 return;
11367         }
11368         chk->copy_by_ref = 0;
11369         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11370         chk->rec.chunk_id.can_take_data = 1;
11371         chk->flags = 0;
11372         chk->asoc = &stcb->asoc;
11373         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11374
11375         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11376         if (chk->data == NULL) {
11377                 sctp_free_a_chunk(stcb, chk, so_locked);
11378                 return;
11379         }
11380         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11381         SCTP_BUF_LEN(chk->data) = chk->send_size;
11382         chk->sent = SCTP_DATAGRAM_UNSENT;
11383         chk->snd_count = 0;
11384         chk->whoTo = net;
11385         atomic_add_int(&chk->whoTo->ref_count, 1);
11386         /* Now we have a mbuf that we can fill in with the details */
11387         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11388         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11389         /* fill out chunk header */
11390         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11391         hb->ch.chunk_flags = 0;
11392         hb->ch.chunk_length = htons(chk->send_size);
11393         /* Fill out hb parameter */
11394         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11395         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11396         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11397         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11398         /* Did our user request this one, put it in */
11399         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11400         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11401         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11402                 /*
11403                  * we only take from the entropy pool if the address is not
11404                  * confirmed.
11405                  */
11406                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11407                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11408         } else {
11409                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11410                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11411         }
11412         switch (net->ro._l_addr.sa.sa_family) {
11413 #ifdef INET
11414         case AF_INET:
11415                 memcpy(hb->heartbeat.hb_info.address,
11416                     &net->ro._l_addr.sin.sin_addr,
11417                     sizeof(net->ro._l_addr.sin.sin_addr));
11418                 break;
11419 #endif
11420 #ifdef INET6
11421         case AF_INET6:
11422                 memcpy(hb->heartbeat.hb_info.address,
11423                     &net->ro._l_addr.sin6.sin6_addr,
11424                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11425                 break;
11426 #endif
11427         default:
11428                 if (chk->data) {
11429                         sctp_m_freem(chk->data);
11430                         chk->data = NULL;
11431                 }
11432                 sctp_free_a_chunk(stcb, chk, so_locked);
11433                 return;
11434                 break;
11435         }
11436         net->hb_responded = 0;
11437         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11438         stcb->asoc.ctrl_queue_cnt++;
11439         SCTP_STAT_INCR(sctps_sendheartbeat);
11440         return;
11441 }
11442
11443 void
11444 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11445     uint32_t high_tsn)
11446 {
11447         struct sctp_association *asoc;
11448         struct sctp_ecne_chunk *ecne;
11449         struct sctp_tmit_chunk *chk;
11450
11451         if (net == NULL) {
11452                 return;
11453         }
11454         asoc = &stcb->asoc;
11455         SCTP_TCB_LOCK_ASSERT(stcb);
11456         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11457                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11458                         /* found a previous ECN_ECHO update it if needed */
11459                         uint32_t cnt, ctsn;
11460
11461                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11462                         ctsn = ntohl(ecne->tsn);
11463                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11464                                 ecne->tsn = htonl(high_tsn);
11465                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11466                         }
11467                         cnt = ntohl(ecne->num_pkts_since_cwr);
11468                         cnt++;
11469                         ecne->num_pkts_since_cwr = htonl(cnt);
11470                         return;
11471                 }
11472         }
11473         /* nope could not find one to update so we must build one */
11474         sctp_alloc_a_chunk(stcb, chk);
11475         if (chk == NULL) {
11476                 return;
11477         }
11478         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11479         chk->copy_by_ref = 0;
11480         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11481         chk->rec.chunk_id.can_take_data = 0;
11482         chk->flags = 0;
11483         chk->asoc = &stcb->asoc;
11484         chk->send_size = sizeof(struct sctp_ecne_chunk);
11485         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11486         if (chk->data == NULL) {
11487                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11488                 return;
11489         }
11490         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11491         SCTP_BUF_LEN(chk->data) = chk->send_size;
11492         chk->sent = SCTP_DATAGRAM_UNSENT;
11493         chk->snd_count = 0;
11494         chk->whoTo = net;
11495         atomic_add_int(&chk->whoTo->ref_count, 1);
11496
11497         stcb->asoc.ecn_echo_cnt_onq++;
11498         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11499         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11500         ecne->ch.chunk_flags = 0;
11501         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11502         ecne->tsn = htonl(high_tsn);
11503         ecne->num_pkts_since_cwr = htonl(1);
11504         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11505         asoc->ctrl_queue_cnt++;
11506 }
11507
11508 void
11509 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11510     struct mbuf *m, int len, int iphlen, int bad_crc)
11511 {
11512         struct sctp_association *asoc;
11513         struct sctp_pktdrop_chunk *drp;
11514         struct sctp_tmit_chunk *chk;
11515         uint8_t *datap;
11516         int was_trunc = 0;
11517         int fullsz = 0;
11518         long spc;
11519         int offset;
11520         struct sctp_chunkhdr *ch, chunk_buf;
11521         unsigned int chk_length;
11522
11523         if (!stcb) {
11524                 return;
11525         }
11526         asoc = &stcb->asoc;
11527         SCTP_TCB_LOCK_ASSERT(stcb);
11528         if (asoc->pktdrop_supported == 0) {
11529                 /*-
11530                  * peer must declare support before I send one.
11531                  */
11532                 return;
11533         }
11534         if (stcb->sctp_socket == NULL) {
11535                 return;
11536         }
11537         sctp_alloc_a_chunk(stcb, chk);
11538         if (chk == NULL) {
11539                 return;
11540         }
11541         chk->copy_by_ref = 0;
11542         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11543         chk->rec.chunk_id.can_take_data = 1;
11544         chk->flags = 0;
11545         len -= iphlen;
11546         chk->send_size = len;
11547         /* Validate that we do not have an ABORT in here. */
11548         offset = iphlen + sizeof(struct sctphdr);
11549         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11550             sizeof(*ch), (uint8_t *)&chunk_buf);
11551         while (ch != NULL) {
11552                 chk_length = ntohs(ch->chunk_length);
11553                 if (chk_length < sizeof(*ch)) {
11554                         /* break to abort land */
11555                         break;
11556                 }
11557                 switch (ch->chunk_type) {
11558                 case SCTP_PACKET_DROPPED:
11559                 case SCTP_ABORT_ASSOCIATION:
11560                 case SCTP_INITIATION_ACK:
11561                         /**
11562                          * We don't respond with an PKT-DROP to an ABORT
11563                          * or PKT-DROP. We also do not respond to an
11564                          * INIT-ACK, because we can't know if the initiation
11565                          * tag is correct or not.
11566                          */
11567                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11568                         return;
11569                 default:
11570                         break;
11571                 }
11572                 offset += SCTP_SIZE32(chk_length);
11573                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11574                     sizeof(*ch), (uint8_t *)&chunk_buf);
11575         }
11576
11577         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11578             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11579                 /*
11580                  * only send 1 mtu worth, trim off the excess on the end.
11581                  */
11582                 fullsz = len;
11583                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11584                 was_trunc = 1;
11585         }
11586         chk->asoc = &stcb->asoc;
11587         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11588         if (chk->data == NULL) {
11589 jump_out:
11590                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11591                 return;
11592         }
11593         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11594         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11595         if (drp == NULL) {
11596                 sctp_m_freem(chk->data);
11597                 chk->data = NULL;
11598                 goto jump_out;
11599         }
11600         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11601             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11602         chk->book_size_scale = 0;
11603         if (was_trunc) {
11604                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11605                 drp->trunc_len = htons(fullsz);
11606                 /*
11607                  * Len is already adjusted to size minus overhead above take
11608                  * out the pkt_drop chunk itself from it.
11609                  */
11610                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11611                 len = chk->send_size;
11612         } else {
11613                 /* no truncation needed */
11614                 drp->ch.chunk_flags = 0;
11615                 drp->trunc_len = htons(0);
11616         }
11617         if (bad_crc) {
11618                 drp->ch.chunk_flags |= SCTP_BADCRC;
11619         }
11620         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11621         SCTP_BUF_LEN(chk->data) = chk->send_size;
11622         chk->sent = SCTP_DATAGRAM_UNSENT;
11623         chk->snd_count = 0;
11624         if (net) {
11625                 /* we should hit here */
11626                 chk->whoTo = net;
11627                 atomic_add_int(&chk->whoTo->ref_count, 1);
11628         } else {
11629                 chk->whoTo = NULL;
11630         }
11631         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11632         drp->ch.chunk_length = htons(chk->send_size);
11633         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11634         if (spc < 0) {
11635                 spc = 0;
11636         }
11637         drp->bottle_bw = htonl(spc);
11638         if (asoc->my_rwnd) {
11639                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11640                     asoc->size_on_all_streams +
11641                     asoc->my_rwnd_control_len +
11642                     stcb->sctp_socket->so_rcv.sb_cc);
11643         } else {
11644                 /*-
11645                  * If my rwnd is 0, possibly from mbuf depletion as well as
11646                  * space used, tell the peer there is NO space aka onq == bw
11647                  */
11648                 drp->current_onq = htonl(spc);
11649         }
11650         drp->reserved = 0;
11651         datap = drp->data;
11652         m_copydata(m, iphlen, len, (caddr_t)datap);
11653         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11654         asoc->ctrl_queue_cnt++;
11655 }
11656
11657 void
11658 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11659 {
11660         struct sctp_association *asoc;
11661         struct sctp_cwr_chunk *cwr;
11662         struct sctp_tmit_chunk *chk;
11663
11664         SCTP_TCB_LOCK_ASSERT(stcb);
11665         if (net == NULL) {
11666                 return;
11667         }
11668         asoc = &stcb->asoc;
11669         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11670                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11671                         /*
11672                          * found a previous CWR queued to same destination
11673                          * update it if needed
11674                          */
11675                         uint32_t ctsn;
11676
11677                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11678                         ctsn = ntohl(cwr->tsn);
11679                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11680                                 cwr->tsn = htonl(high_tsn);
11681                         }
11682                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11683                                 /* Make sure override is carried */
11684                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11685                         }
11686                         return;
11687                 }
11688         }
11689         sctp_alloc_a_chunk(stcb, chk);
11690         if (chk == NULL) {
11691                 return;
11692         }
11693         chk->copy_by_ref = 0;
11694         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11695         chk->rec.chunk_id.can_take_data = 1;
11696         chk->flags = 0;
11697         chk->asoc = &stcb->asoc;
11698         chk->send_size = sizeof(struct sctp_cwr_chunk);
11699         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11700         if (chk->data == NULL) {
11701                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11702                 return;
11703         }
11704         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11705         SCTP_BUF_LEN(chk->data) = chk->send_size;
11706         chk->sent = SCTP_DATAGRAM_UNSENT;
11707         chk->snd_count = 0;
11708         chk->whoTo = net;
11709         atomic_add_int(&chk->whoTo->ref_count, 1);
11710         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11711         cwr->ch.chunk_type = SCTP_ECN_CWR;
11712         cwr->ch.chunk_flags = override;
11713         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11714         cwr->tsn = htonl(high_tsn);
11715         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11716         asoc->ctrl_queue_cnt++;
11717 }
11718
11719 static int
11720 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11721     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11722 {
11723         uint16_t len, old_len, i;
11724         struct sctp_stream_reset_out_request *req_out;
11725         struct sctp_chunkhdr *ch;
11726         int at;
11727         int number_entries = 0;
11728
11729         ch = mtod(chk->data, struct sctp_chunkhdr *);
11730         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11731         /* get to new offset for the param. */
11732         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11733         /* now how long will this param be? */
11734         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11735                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11736                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11737                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11738                         number_entries++;
11739                 }
11740         }
11741         if (number_entries == 0) {
11742                 return (0);
11743         }
11744         if (number_entries == stcb->asoc.streamoutcnt) {
11745                 number_entries = 0;
11746         }
11747         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11748                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11749         }
11750         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11751         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11752         req_out->ph.param_length = htons(len);
11753         req_out->request_seq = htonl(seq);
11754         req_out->response_seq = htonl(resp_seq);
11755         req_out->send_reset_at_tsn = htonl(last_sent);
11756         at = 0;
11757         if (number_entries) {
11758                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11759                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11760                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11761                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11762                                 req_out->list_of_streams[at] = htons(i);
11763                                 at++;
11764                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11765                                 if (at >= number_entries) {
11766                                         break;
11767                                 }
11768                         }
11769                 }
11770         } else {
11771                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11772                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11773                 }
11774         }
11775         if (SCTP_SIZE32(len) > len) {
11776                 /*-
11777                  * Need to worry about the pad we may end up adding to the
11778                  * end. This is easy since the struct is either aligned to 4
11779                  * bytes or 2 bytes off.
11780                  */
11781                 req_out->list_of_streams[number_entries] = 0;
11782         }
11783         /* now fix the chunk length */
11784         ch->chunk_length = htons(len + old_len);
11785         chk->book_size = len + old_len;
11786         chk->book_size_scale = 0;
11787         chk->send_size = SCTP_SIZE32(chk->book_size);
11788         SCTP_BUF_LEN(chk->data) = chk->send_size;
11789         return (1);
11790 }
11791
11792 static void
11793 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11794     int number_entries, uint16_t *list,
11795     uint32_t seq)
11796 {
11797         uint16_t len, old_len, i;
11798         struct sctp_stream_reset_in_request *req_in;
11799         struct sctp_chunkhdr *ch;
11800
11801         ch = mtod(chk->data, struct sctp_chunkhdr *);
11802         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11803
11804         /* get to new offset for the param. */
11805         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11806         /* now how long will this param be? */
11807         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11808         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11809         req_in->ph.param_length = htons(len);
11810         req_in->request_seq = htonl(seq);
11811         if (number_entries) {
11812                 for (i = 0; i < number_entries; i++) {
11813                         req_in->list_of_streams[i] = htons(list[i]);
11814                 }
11815         }
11816         if (SCTP_SIZE32(len) > len) {
11817                 /*-
11818                  * Need to worry about the pad we may end up adding to the
11819                  * end. This is easy since the struct is either aligned to 4
11820                  * bytes or 2 bytes off.
11821                  */
11822                 req_in->list_of_streams[number_entries] = 0;
11823         }
11824         /* now fix the chunk length */
11825         ch->chunk_length = htons(len + old_len);
11826         chk->book_size = len + old_len;
11827         chk->book_size_scale = 0;
11828         chk->send_size = SCTP_SIZE32(chk->book_size);
11829         SCTP_BUF_LEN(chk->data) = chk->send_size;
11830         return;
11831 }
11832
11833 static void
11834 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11835     uint32_t seq)
11836 {
11837         uint16_t len, old_len;
11838         struct sctp_stream_reset_tsn_request *req_tsn;
11839         struct sctp_chunkhdr *ch;
11840
11841         ch = mtod(chk->data, struct sctp_chunkhdr *);
11842         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11843
11844         /* get to new offset for the param. */
11845         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11846         /* now how long will this param be? */
11847         len = sizeof(struct sctp_stream_reset_tsn_request);
11848         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11849         req_tsn->ph.param_length = htons(len);
11850         req_tsn->request_seq = htonl(seq);
11851
11852         /* now fix the chunk length */
11853         ch->chunk_length = htons(len + old_len);
11854         chk->send_size = len + old_len;
11855         chk->book_size = SCTP_SIZE32(chk->send_size);
11856         chk->book_size_scale = 0;
11857         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11858         return;
11859 }
11860
11861 void
11862 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11863     uint32_t resp_seq, uint32_t result)
11864 {
11865         uint16_t len, old_len;
11866         struct sctp_stream_reset_response *resp;
11867         struct sctp_chunkhdr *ch;
11868
11869         ch = mtod(chk->data, struct sctp_chunkhdr *);
11870         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11871
11872         /* get to new offset for the param. */
11873         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11874         /* now how long will this param be? */
11875         len = sizeof(struct sctp_stream_reset_response);
11876         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11877         resp->ph.param_length = htons(len);
11878         resp->response_seq = htonl(resp_seq);
11879         resp->result = ntohl(result);
11880
11881         /* now fix the chunk length */
11882         ch->chunk_length = htons(len + old_len);
11883         chk->book_size = len + old_len;
11884         chk->book_size_scale = 0;
11885         chk->send_size = SCTP_SIZE32(chk->book_size);
11886         SCTP_BUF_LEN(chk->data) = chk->send_size;
11887         return;
11888 }
11889
11890 void
11891 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11892     struct sctp_stream_reset_list *ent,
11893     int response)
11894 {
11895         struct sctp_association *asoc;
11896         struct sctp_tmit_chunk *chk;
11897         struct sctp_chunkhdr *ch;
11898
11899         asoc = &stcb->asoc;
11900
11901         /*
11902          * Reset our last reset action to the new one IP -> response
11903          * (PERFORMED probably). This assures that if we fail to send, a
11904          * retran from the peer will get the new response.
11905          */
11906         asoc->last_reset_action[0] = response;
11907         if (asoc->stream_reset_outstanding) {
11908                 return;
11909         }
11910         sctp_alloc_a_chunk(stcb, chk);
11911         if (chk == NULL) {
11912                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11913                 return;
11914         }
11915         chk->copy_by_ref = 0;
11916         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11917         chk->rec.chunk_id.can_take_data = 0;
11918         chk->flags = 0;
11919         chk->asoc = &stcb->asoc;
11920         chk->book_size = sizeof(struct sctp_chunkhdr);
11921         chk->send_size = SCTP_SIZE32(chk->book_size);
11922         chk->book_size_scale = 0;
11923         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11924         if (chk->data == NULL) {
11925                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11926                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11927                 return;
11928         }
11929         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11930         /* setup chunk parameters */
11931         chk->sent = SCTP_DATAGRAM_UNSENT;
11932         chk->snd_count = 0;
11933         if (stcb->asoc.alternate) {
11934                 chk->whoTo = stcb->asoc.alternate;
11935         } else {
11936                 chk->whoTo = stcb->asoc.primary_destination;
11937         }
11938         ch = mtod(chk->data, struct sctp_chunkhdr *);
11939         ch->chunk_type = SCTP_STREAM_RESET;
11940         ch->chunk_flags = 0;
11941         ch->chunk_length = htons(chk->book_size);
11942         atomic_add_int(&chk->whoTo->ref_count, 1);
11943         SCTP_BUF_LEN(chk->data) = chk->send_size;
11944         sctp_add_stream_reset_result(chk, ent->seq, response);
11945         /* insert the chunk for sending */
11946         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11947             chk,
11948             sctp_next);
11949         asoc->ctrl_queue_cnt++;
11950 }
11951
11952 void
11953 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11954     uint32_t resp_seq, uint32_t result,
11955     uint32_t send_una, uint32_t recv_next)
11956 {
11957         uint16_t len, old_len;
11958         struct sctp_stream_reset_response_tsn *resp;
11959         struct sctp_chunkhdr *ch;
11960
11961         ch = mtod(chk->data, struct sctp_chunkhdr *);
11962         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11963
11964         /* get to new offset for the param. */
11965         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11966         /* now how long will this param be? */
11967         len = sizeof(struct sctp_stream_reset_response_tsn);
11968         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11969         resp->ph.param_length = htons(len);
11970         resp->response_seq = htonl(resp_seq);
11971         resp->result = htonl(result);
11972         resp->senders_next_tsn = htonl(send_una);
11973         resp->receivers_next_tsn = htonl(recv_next);
11974
11975         /* now fix the chunk length */
11976         ch->chunk_length = htons(len + old_len);
11977         chk->book_size = len + old_len;
11978         chk->send_size = SCTP_SIZE32(chk->book_size);
11979         chk->book_size_scale = 0;
11980         SCTP_BUF_LEN(chk->data) = chk->send_size;
11981         return;
11982 }
11983
11984 static void
11985 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11986     uint32_t seq,
11987     uint16_t adding)
11988 {
11989         uint16_t len, old_len;
11990         struct sctp_chunkhdr *ch;
11991         struct sctp_stream_reset_add_strm *addstr;
11992
11993         ch = mtod(chk->data, struct sctp_chunkhdr *);
11994         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11995
11996         /* get to new offset for the param. */
11997         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11998         /* now how long will this param be? */
11999         len = sizeof(struct sctp_stream_reset_add_strm);
12000
12001         /* Fill it out. */
12002         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
12003         addstr->ph.param_length = htons(len);
12004         addstr->request_seq = htonl(seq);
12005         addstr->number_of_streams = htons(adding);
12006         addstr->reserved = 0;
12007
12008         /* now fix the chunk length */
12009         ch->chunk_length = htons(len + old_len);
12010         chk->send_size = len + old_len;
12011         chk->book_size = SCTP_SIZE32(chk->send_size);
12012         chk->book_size_scale = 0;
12013         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12014         return;
12015 }
12016
12017 static void
12018 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12019     uint32_t seq,
12020     uint16_t adding)
12021 {
12022         uint16_t len, old_len;
12023         struct sctp_chunkhdr *ch;
12024         struct sctp_stream_reset_add_strm *addstr;
12025
12026         ch = mtod(chk->data, struct sctp_chunkhdr *);
12027         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12028
12029         /* get to new offset for the param. */
12030         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12031         /* now how long will this param be? */
12032         len = sizeof(struct sctp_stream_reset_add_strm);
12033         /* Fill it out. */
12034         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12035         addstr->ph.param_length = htons(len);
12036         addstr->request_seq = htonl(seq);
12037         addstr->number_of_streams = htons(adding);
12038         addstr->reserved = 0;
12039
12040         /* now fix the chunk length */
12041         ch->chunk_length = htons(len + old_len);
12042         chk->send_size = len + old_len;
12043         chk->book_size = SCTP_SIZE32(chk->send_size);
12044         chk->book_size_scale = 0;
12045         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12046         return;
12047 }
12048
12049 int
12050 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12051 {
12052         struct sctp_association *asoc;
12053         struct sctp_tmit_chunk *chk;
12054         struct sctp_chunkhdr *ch;
12055         uint32_t seq;
12056
12057         asoc = &stcb->asoc;
12058         asoc->trigger_reset = 0;
12059         if (asoc->stream_reset_outstanding) {
12060                 return (EALREADY);
12061         }
12062         sctp_alloc_a_chunk(stcb, chk);
12063         if (chk == NULL) {
12064                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12065                 return (ENOMEM);
12066         }
12067         chk->copy_by_ref = 0;
12068         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12069         chk->rec.chunk_id.can_take_data = 0;
12070         chk->flags = 0;
12071         chk->asoc = &stcb->asoc;
12072         chk->book_size = sizeof(struct sctp_chunkhdr);
12073         chk->send_size = SCTP_SIZE32(chk->book_size);
12074         chk->book_size_scale = 0;
12075         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12076         if (chk->data == NULL) {
12077                 sctp_free_a_chunk(stcb, chk, so_locked);
12078                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12079                 return (ENOMEM);
12080         }
12081         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12082
12083         /* setup chunk parameters */
12084         chk->sent = SCTP_DATAGRAM_UNSENT;
12085         chk->snd_count = 0;
12086         if (stcb->asoc.alternate) {
12087                 chk->whoTo = stcb->asoc.alternate;
12088         } else {
12089                 chk->whoTo = stcb->asoc.primary_destination;
12090         }
12091         ch = mtod(chk->data, struct sctp_chunkhdr *);
12092         ch->chunk_type = SCTP_STREAM_RESET;
12093         ch->chunk_flags = 0;
12094         ch->chunk_length = htons(chk->book_size);
12095         atomic_add_int(&chk->whoTo->ref_count, 1);
12096         SCTP_BUF_LEN(chk->data) = chk->send_size;
12097         seq = stcb->asoc.str_reset_seq_out;
12098         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12099                 seq++;
12100                 asoc->stream_reset_outstanding++;
12101         } else {
12102                 m_freem(chk->data);
12103                 chk->data = NULL;
12104                 sctp_free_a_chunk(stcb, chk, so_locked);
12105                 return (ENOENT);
12106         }
12107         asoc->str_reset = chk;
12108         /* insert the chunk for sending */
12109         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12110             chk,
12111             sctp_next);
12112         asoc->ctrl_queue_cnt++;
12113
12114         if (stcb->asoc.send_sack) {
12115                 sctp_send_sack(stcb, so_locked);
12116         }
12117         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12118         return (0);
12119 }
12120
12121 int
12122 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12123     uint16_t number_entries, uint16_t *list,
12124     uint8_t send_in_req,
12125     uint8_t send_tsn_req,
12126     uint8_t add_stream,
12127     uint16_t adding_o,
12128     uint16_t adding_i, uint8_t peer_asked)
12129 {
12130         struct sctp_association *asoc;
12131         struct sctp_tmit_chunk *chk;
12132         struct sctp_chunkhdr *ch;
12133         int can_send_out_req = 0;
12134         uint32_t seq;
12135
12136         asoc = &stcb->asoc;
12137         if (asoc->stream_reset_outstanding) {
12138                 /*-
12139                  * Already one pending, must get ACK back to clear the flag.
12140                  */
12141                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12142                 return (EBUSY);
12143         }
12144         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12145             (add_stream == 0)) {
12146                 /* nothing to do */
12147                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12148                 return (EINVAL);
12149         }
12150         if (send_tsn_req && send_in_req) {
12151                 /* error, can't do that */
12152                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12153                 return (EINVAL);
12154         } else if (send_in_req) {
12155                 can_send_out_req = 1;
12156         }
12157         if (number_entries > (MCLBYTES -
12158             SCTP_MIN_OVERHEAD -
12159             sizeof(struct sctp_chunkhdr) -
12160             sizeof(struct sctp_stream_reset_out_request)) /
12161             sizeof(uint16_t)) {
12162                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12163                 return (ENOMEM);
12164         }
12165         sctp_alloc_a_chunk(stcb, chk);
12166         if (chk == NULL) {
12167                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12168                 return (ENOMEM);
12169         }
12170         chk->copy_by_ref = 0;
12171         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12172         chk->rec.chunk_id.can_take_data = 0;
12173         chk->flags = 0;
12174         chk->asoc = &stcb->asoc;
12175         chk->book_size = sizeof(struct sctp_chunkhdr);
12176         chk->send_size = SCTP_SIZE32(chk->book_size);
12177         chk->book_size_scale = 0;
12178
12179         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12180         if (chk->data == NULL) {
12181                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12182                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12183                 return (ENOMEM);
12184         }
12185         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12186
12187         /* setup chunk parameters */
12188         chk->sent = SCTP_DATAGRAM_UNSENT;
12189         chk->snd_count = 0;
12190         if (stcb->asoc.alternate) {
12191                 chk->whoTo = stcb->asoc.alternate;
12192         } else {
12193                 chk->whoTo = stcb->asoc.primary_destination;
12194         }
12195         atomic_add_int(&chk->whoTo->ref_count, 1);
12196         ch = mtod(chk->data, struct sctp_chunkhdr *);
12197         ch->chunk_type = SCTP_STREAM_RESET;
12198         ch->chunk_flags = 0;
12199         ch->chunk_length = htons(chk->book_size);
12200         SCTP_BUF_LEN(chk->data) = chk->send_size;
12201
12202         seq = stcb->asoc.str_reset_seq_out;
12203         if (can_send_out_req) {
12204                 int ret;
12205
12206                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12207                 if (ret) {
12208                         seq++;
12209                         asoc->stream_reset_outstanding++;
12210                 }
12211         }
12212         if ((add_stream & 1) &&
12213             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12214                 /* Need to allocate more */
12215                 struct sctp_stream_out *oldstream;
12216                 struct sctp_stream_queue_pending *sp, *nsp;
12217                 int i;
12218 #if defined(SCTP_DETAILED_STR_STATS)
12219                 int j;
12220 #endif
12221
12222                 oldstream = stcb->asoc.strmout;
12223                 /* get some more */
12224                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12225                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12226                     SCTP_M_STRMO);
12227                 if (stcb->asoc.strmout == NULL) {
12228                         uint8_t x;
12229
12230                         stcb->asoc.strmout = oldstream;
12231                         /* Turn off the bit */
12232                         x = add_stream & 0xfe;
12233                         add_stream = x;
12234                         goto skip_stuff;
12235                 }
12236                 /*
12237                  * Ok now we proceed with copying the old out stuff and
12238                  * initializing the new stuff.
12239                  */
12240                 SCTP_TCB_SEND_LOCK(stcb);
12241                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12242                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12243                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12244                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12245                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12246                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12247                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12248                         stcb->asoc.strmout[i].sid = i;
12249                         stcb->asoc.strmout[i].state = oldstream[i].state;
12250                         /* FIX ME FIX ME */
12251                         /*
12252                          * This should be a SS_COPY operation FIX ME STREAM
12253                          * SCHEDULER EXPERT
12254                          */
12255                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12256                         /* now anything on those queues? */
12257                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12258                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12259                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12260                         }
12261
12262                 }
12263                 /* now the new streams */
12264                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12265                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12266                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12267                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12268 #if defined(SCTP_DETAILED_STR_STATS)
12269                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12270                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12271                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12272                         }
12273 #else
12274                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12275                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12276 #endif
12277                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12278                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12279                         stcb->asoc.strmout[i].sid = i;
12280                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12281                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12282                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12283                 }
12284                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12285                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12286                 SCTP_TCB_SEND_UNLOCK(stcb);
12287         }
12288 skip_stuff:
12289         if ((add_stream & 1) && (adding_o > 0)) {
12290                 asoc->strm_pending_add_size = adding_o;
12291                 asoc->peer_req_out = peer_asked;
12292                 sctp_add_an_out_stream(chk, seq, adding_o);
12293                 seq++;
12294                 asoc->stream_reset_outstanding++;
12295         }
12296         if ((add_stream & 2) && (adding_i > 0)) {
12297                 sctp_add_an_in_stream(chk, seq, adding_i);
12298                 seq++;
12299                 asoc->stream_reset_outstanding++;
12300         }
12301         if (send_in_req) {
12302                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12303                 seq++;
12304                 asoc->stream_reset_outstanding++;
12305         }
12306         if (send_tsn_req) {
12307                 sctp_add_stream_reset_tsn(chk, seq);
12308                 asoc->stream_reset_outstanding++;
12309         }
12310         asoc->str_reset = chk;
12311         /* insert the chunk for sending */
12312         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12313             chk,
12314             sctp_next);
12315         asoc->ctrl_queue_cnt++;
12316         if (stcb->asoc.send_sack) {
12317                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12318         }
12319         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12320         return (0);
12321 }
12322
12323 void
12324 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12325     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12326     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12327     uint32_t vrf_id, uint16_t port)
12328 {
12329         /* Don't respond to an ABORT with an ABORT. */
12330         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12331                 if (cause)
12332                         sctp_m_freem(cause);
12333                 return;
12334         }
12335         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12336             mflowtype, mflowid, fibnum,
12337             vrf_id, port);
12338         return;
12339 }
12340
12341 void
12342 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12343     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12344     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12345     uint32_t vrf_id, uint16_t port)
12346 {
12347         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12348             mflowtype, mflowid, fibnum,
12349             vrf_id, port);
12350         return;
12351 }
12352
12353 static struct mbuf *
12354 sctp_copy_resume(struct uio *uio,
12355     int max_send_len,
12356     int user_marks_eor,
12357     int *error,
12358     uint32_t *sndout,
12359     struct mbuf **new_tail)
12360 {
12361         struct mbuf *m;
12362
12363         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12364             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12365         if (m == NULL) {
12366                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12367                 *error = ENOBUFS;
12368         } else {
12369                 *sndout = m_length(m, NULL);
12370                 *new_tail = m_last(m);
12371         }
12372         return (m);
12373 }
12374
12375 static int
12376 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12377     struct uio *uio,
12378     int resv_upfront)
12379 {
12380         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12381             resv_upfront, 0);
12382         if (sp->data == NULL) {
12383                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12384                 return (ENOBUFS);
12385         }
12386         sp->tail_mbuf = m_last(sp->data);
12387         return (0);
12388 }
12389
12390
12391
12392 static struct sctp_stream_queue_pending *
12393 sctp_copy_it_in(struct sctp_tcb *stcb,
12394     struct sctp_association *asoc,
12395     struct sctp_sndrcvinfo *srcv,
12396     struct uio *uio,
12397     struct sctp_nets *net,
12398     int max_send_len,
12399     int user_marks_eor,
12400     int *error)
12401 {
12402         /*-
12403          * This routine must be very careful in its work. Protocol
12404          * processing is up and running so care must be taken to spl...()
12405          * when you need to do something that may effect the stcb/asoc. The
12406          * sb is locked however. When data is copied the protocol processing
12407          * should be enabled since this is a slower operation...
12408          */
12409         struct sctp_stream_queue_pending *sp = NULL;
12410         int resv_in_first;
12411
12412         *error = 0;
12413         /* Now can we send this? */
12414         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12415             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12416             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12417             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12418                 /* got data while shutting down */
12419                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12420                 *error = ECONNRESET;
12421                 goto out_now;
12422         }
12423         sctp_alloc_a_strmoq(stcb, sp);
12424         if (sp == NULL) {
12425                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12426                 *error = ENOMEM;
12427                 goto out_now;
12428         }
12429         sp->act_flags = 0;
12430         sp->sender_all_done = 0;
12431         sp->sinfo_flags = srcv->sinfo_flags;
12432         sp->timetolive = srcv->sinfo_timetolive;
12433         sp->ppid = srcv->sinfo_ppid;
12434         sp->context = srcv->sinfo_context;
12435         sp->fsn = 0;
12436         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12437
12438         sp->sid = srcv->sinfo_stream;
12439         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12440         if ((sp->length == (uint32_t)uio->uio_resid) &&
12441             ((user_marks_eor == 0) ||
12442             (srcv->sinfo_flags & SCTP_EOF) ||
12443             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12444                 sp->msg_is_complete = 1;
12445         } else {
12446                 sp->msg_is_complete = 0;
12447         }
12448         sp->sender_all_done = 0;
12449         sp->some_taken = 0;
12450         sp->put_last_out = 0;
12451         resv_in_first = sizeof(struct sctp_data_chunk);
12452         sp->data = sp->tail_mbuf = NULL;
12453         if (sp->length == 0) {
12454                 *error = 0;
12455                 goto skip_copy;
12456         }
12457         if (srcv->sinfo_keynumber_valid) {
12458                 sp->auth_keyid = srcv->sinfo_keynumber;
12459         } else {
12460                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12461         }
12462         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12463                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12464                 sp->holds_key_ref = 1;
12465         }
12466         *error = sctp_copy_one(sp, uio, resv_in_first);
12467 skip_copy:
12468         if (*error) {
12469                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12470                 sp = NULL;
12471         } else {
12472                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12473                         sp->net = net;
12474                         atomic_add_int(&sp->net->ref_count, 1);
12475                 } else {
12476                         sp->net = NULL;
12477                 }
12478                 sctp_set_prsctp_policy(sp);
12479         }
12480 out_now:
12481         return (sp);
12482 }
12483
12484
12485 int
12486 sctp_sosend(struct socket *so,
12487     struct sockaddr *addr,
12488     struct uio *uio,
12489     struct mbuf *top,
12490     struct mbuf *control,
12491     int flags,
12492     struct thread *p
12493 )
12494 {
12495         int error, use_sndinfo = 0;
12496         struct sctp_sndrcvinfo sndrcvninfo;
12497         struct sockaddr *addr_to_use;
12498 #if defined(INET) && defined(INET6)
12499         struct sockaddr_in sin;
12500 #endif
12501
12502         if (control) {
12503                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12504                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12505                     sizeof(sndrcvninfo))) {
12506                         /* got one */
12507                         use_sndinfo = 1;
12508                 }
12509         }
12510         addr_to_use = addr;
12511 #if defined(INET) && defined(INET6)
12512         if ((addr) && (addr->sa_family == AF_INET6)) {
12513                 struct sockaddr_in6 *sin6;
12514
12515                 sin6 = (struct sockaddr_in6 *)addr;
12516                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12517                         in6_sin6_2_sin(&sin, sin6);
12518                         addr_to_use = (struct sockaddr *)&sin;
12519                 }
12520         }
12521 #endif
12522         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12523             control,
12524             flags,
12525             use_sndinfo ? &sndrcvninfo : NULL
12526             ,p
12527             );
12528         return (error);
12529 }
12530
12531
12532 int
12533 sctp_lower_sosend(struct socket *so,
12534     struct sockaddr *addr,
12535     struct uio *uio,
12536     struct mbuf *i_pak,
12537     struct mbuf *control,
12538     int flags,
12539     struct sctp_sndrcvinfo *srcv
12540     ,
12541     struct thread *p
12542 )
12543 {
12544         unsigned int sndlen = 0, max_len;
12545         int error, len;
12546         struct mbuf *top = NULL;
12547         int queue_only = 0, queue_only_for_init = 0;
12548         int free_cnt_applied = 0;
12549         int un_sent;
12550         int now_filled = 0;
12551         unsigned int inqueue_bytes = 0;
12552         struct sctp_block_entry be;
12553         struct sctp_inpcb *inp;
12554         struct sctp_tcb *stcb = NULL;
12555         struct timeval now;
12556         struct sctp_nets *net;
12557         struct sctp_association *asoc;
12558         struct sctp_inpcb *t_inp;
12559         int user_marks_eor;
12560         int create_lock_applied = 0;
12561         int nagle_applies = 0;
12562         int some_on_control = 0;
12563         int got_all_of_the_send = 0;
12564         int hold_tcblock = 0;
12565         int non_blocking = 0;
12566         uint32_t local_add_more, local_soresv = 0;
12567         uint16_t port;
12568         uint16_t sinfo_flags;
12569         sctp_assoc_t sinfo_assoc_id;
12570
12571         error = 0;
12572         net = NULL;
12573         stcb = NULL;
12574         asoc = NULL;
12575
12576         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12577         if (inp == NULL) {
12578                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12579                 error = EINVAL;
12580                 if (i_pak) {
12581                         SCTP_RELEASE_PKT(i_pak);
12582                 }
12583                 return (error);
12584         }
12585         if ((uio == NULL) && (i_pak == NULL)) {
12586                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12587                 return (EINVAL);
12588         }
12589         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12590         atomic_add_int(&inp->total_sends, 1);
12591         if (uio) {
12592                 if (uio->uio_resid < 0) {
12593                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12594                         return (EINVAL);
12595                 }
12596                 sndlen = (unsigned int)uio->uio_resid;
12597         } else {
12598                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12599                 sndlen = SCTP_HEADER_LEN(i_pak);
12600         }
12601         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12602             (void *)addr,
12603             sndlen);
12604         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12605             SCTP_IS_LISTENING(inp)) {
12606                 /* The listener can NOT send */
12607                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12608                 error = ENOTCONN;
12609                 goto out_unlocked;
12610         }
12611         /**
12612          * Pre-screen address, if one is given the sin-len
12613          * must be set correctly!
12614          */
12615         if (addr) {
12616                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12617
12618                 switch (raddr->sa.sa_family) {
12619 #ifdef INET
12620                 case AF_INET:
12621                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12622                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12623                                 error = EINVAL;
12624                                 goto out_unlocked;
12625                         }
12626                         port = raddr->sin.sin_port;
12627                         break;
12628 #endif
12629 #ifdef INET6
12630                 case AF_INET6:
12631                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12632                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12633                                 error = EINVAL;
12634                                 goto out_unlocked;
12635                         }
12636                         port = raddr->sin6.sin6_port;
12637                         break;
12638 #endif
12639                 default:
12640                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12641                         error = EAFNOSUPPORT;
12642                         goto out_unlocked;
12643                 }
12644         } else
12645                 port = 0;
12646
12647         if (srcv) {
12648                 sinfo_flags = srcv->sinfo_flags;
12649                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12650                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12651                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12652                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12653                         error = EINVAL;
12654                         goto out_unlocked;
12655                 }
12656                 if (srcv->sinfo_flags)
12657                         SCTP_STAT_INCR(sctps_sends_with_flags);
12658         } else {
12659                 sinfo_flags = inp->def_send.sinfo_flags;
12660                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12661         }
12662         if (sinfo_flags & SCTP_SENDALL) {
12663                 /* its a sendall */
12664                 error = sctp_sendall(inp, uio, top, srcv);
12665                 top = NULL;
12666                 goto out_unlocked;
12667         }
12668         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12669                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12670                 error = EINVAL;
12671                 goto out_unlocked;
12672         }
12673         /* now we must find the assoc */
12674         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12675             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12676                 SCTP_INP_RLOCK(inp);
12677                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12678                 if (stcb) {
12679                         SCTP_TCB_LOCK(stcb);
12680                         hold_tcblock = 1;
12681                 }
12682                 SCTP_INP_RUNLOCK(inp);
12683         } else if (sinfo_assoc_id) {
12684                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12685                 if (stcb != NULL) {
12686                         hold_tcblock = 1;
12687                 }
12688         } else if (addr) {
12689                 /*-
12690                  * Since we did not use findep we must
12691                  * increment it, and if we don't find a tcb
12692                  * decrement it.
12693                  */
12694                 SCTP_INP_WLOCK(inp);
12695                 SCTP_INP_INCR_REF(inp);
12696                 SCTP_INP_WUNLOCK(inp);
12697                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12698                 if (stcb == NULL) {
12699                         SCTP_INP_WLOCK(inp);
12700                         SCTP_INP_DECR_REF(inp);
12701                         SCTP_INP_WUNLOCK(inp);
12702                 } else {
12703                         hold_tcblock = 1;
12704                 }
12705         }
12706         if ((stcb == NULL) && (addr)) {
12707                 /* Possible implicit send? */
12708                 SCTP_ASOC_CREATE_LOCK(inp);
12709                 create_lock_applied = 1;
12710                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12711                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12712                         /* Should I really unlock ? */
12713                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12714                         error = EINVAL;
12715                         goto out_unlocked;
12716
12717                 }
12718                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12719                     (addr->sa_family == AF_INET6)) {
12720                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12721                         error = EINVAL;
12722                         goto out_unlocked;
12723                 }
12724                 SCTP_INP_WLOCK(inp);
12725                 SCTP_INP_INCR_REF(inp);
12726                 SCTP_INP_WUNLOCK(inp);
12727                 /* With the lock applied look again */
12728                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12729                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12730                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12731                 }
12732                 if (stcb == NULL) {
12733                         SCTP_INP_WLOCK(inp);
12734                         SCTP_INP_DECR_REF(inp);
12735                         SCTP_INP_WUNLOCK(inp);
12736                 } else {
12737                         hold_tcblock = 1;
12738                 }
12739                 if (error) {
12740                         goto out_unlocked;
12741                 }
12742                 if (t_inp != inp) {
12743                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12744                         error = ENOTCONN;
12745                         goto out_unlocked;
12746                 }
12747         }
12748         if (stcb == NULL) {
12749                 if (addr == NULL) {
12750                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12751                         error = ENOENT;
12752                         goto out_unlocked;
12753                 } else {
12754                         /* We must go ahead and start the INIT process */
12755                         uint32_t vrf_id;
12756
12757                         if ((sinfo_flags & SCTP_ABORT) ||
12758                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12759                                 /*-
12760                                  * User asks to abort a non-existant assoc,
12761                                  * or EOF a non-existant assoc with no data
12762                                  */
12763                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12764                                 error = ENOENT;
12765                                 goto out_unlocked;
12766                         }
12767                         /* get an asoc/stcb struct */
12768                         vrf_id = inp->def_vrf_id;
12769 #ifdef INVARIANTS
12770                         if (create_lock_applied == 0) {
12771                                 panic("Error, should hold create lock and I don't?");
12772                         }
12773 #endif
12774                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12775                             inp->sctp_ep.pre_open_stream_count,
12776                             inp->sctp_ep.port,
12777                             p);
12778                         if (stcb == NULL) {
12779                                 /* Error is setup for us in the call */
12780                                 goto out_unlocked;
12781                         }
12782                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12783                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12784                                 /*
12785                                  * Set the connected flag so we can queue
12786                                  * data
12787                                  */
12788                                 soisconnecting(so);
12789                         }
12790                         hold_tcblock = 1;
12791                         if (create_lock_applied) {
12792                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12793                                 create_lock_applied = 0;
12794                         } else {
12795                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12796                         }
12797                         /*
12798                          * Turn on queue only flag to prevent data from
12799                          * being sent
12800                          */
12801                         queue_only = 1;
12802                         asoc = &stcb->asoc;
12803                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12804                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12805
12806                         /* initialize authentication params for the assoc */
12807                         sctp_initialize_auth_params(inp, stcb);
12808
12809                         if (control) {
12810                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12811                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12812                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12813                                         hold_tcblock = 0;
12814                                         stcb = NULL;
12815                                         goto out_unlocked;
12816                                 }
12817                         }
12818                         /* out with the INIT */
12819                         queue_only_for_init = 1;
12820                         /*-
12821                          * we may want to dig in after this call and adjust the MTU
12822                          * value. It defaulted to 1500 (constant) but the ro
12823                          * structure may now have an update and thus we may need to
12824                          * change it BEFORE we append the message.
12825                          */
12826                 }
12827         } else
12828                 asoc = &stcb->asoc;
12829         if (srcv == NULL)
12830                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12831         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12832                 if (addr)
12833                         net = sctp_findnet(stcb, addr);
12834                 else
12835                         net = NULL;
12836                 if ((net == NULL) ||
12837                     ((port != 0) && (port != stcb->rport))) {
12838                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12839                         error = EINVAL;
12840                         goto out_unlocked;
12841                 }
12842         } else {
12843                 if (stcb->asoc.alternate) {
12844                         net = stcb->asoc.alternate;
12845                 } else {
12846                         net = stcb->asoc.primary_destination;
12847                 }
12848         }
12849         atomic_add_int(&stcb->total_sends, 1);
12850         /* Keep the stcb from being freed under our feet */
12851         atomic_add_int(&asoc->refcnt, 1);
12852         free_cnt_applied = 1;
12853
12854         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12855                 if (sndlen > asoc->smallest_mtu) {
12856                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12857                         error = EMSGSIZE;
12858                         goto out_unlocked;
12859                 }
12860         }
12861         if (SCTP_SO_IS_NBIO(so)
12862             || (flags & MSG_NBIO)
12863             ) {
12864                 non_blocking = 1;
12865         }
12866         /* would we block? */
12867         if (non_blocking) {
12868                 if (hold_tcblock == 0) {
12869                         SCTP_TCB_LOCK(stcb);
12870                         hold_tcblock = 1;
12871                 }
12872                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12873                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12874                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12875                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12876                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12877                                 error = EMSGSIZE;
12878                         else
12879                                 error = EWOULDBLOCK;
12880                         goto out_unlocked;
12881                 }
12882                 stcb->asoc.sb_send_resv += sndlen;
12883                 SCTP_TCB_UNLOCK(stcb);
12884                 hold_tcblock = 0;
12885         } else {
12886                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12887         }
12888         local_soresv = sndlen;
12889         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12890                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12891                 error = ECONNRESET;
12892                 goto out_unlocked;
12893         }
12894         if (create_lock_applied) {
12895                 SCTP_ASOC_CREATE_UNLOCK(inp);
12896                 create_lock_applied = 0;
12897         }
12898         /* Is the stream no. valid? */
12899         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12900                 /* Invalid stream number */
12901                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12902                 error = EINVAL;
12903                 goto out_unlocked;
12904         }
12905         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12906             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12907                 /*
12908                  * Can't queue any data while stream reset is underway.
12909                  */
12910                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12911                         error = EAGAIN;
12912                 } else {
12913                         error = EINVAL;
12914                 }
12915                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12916                 goto out_unlocked;
12917         }
12918         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12919             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12920                 queue_only = 1;
12921         }
12922         /* we are now done with all control */
12923         if (control) {
12924                 sctp_m_freem(control);
12925                 control = NULL;
12926         }
12927         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12928             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12929             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12930             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12931                 if (srcv->sinfo_flags & SCTP_ABORT) {
12932                         ;
12933                 } else {
12934                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12935                         error = ECONNRESET;
12936                         goto out_unlocked;
12937                 }
12938         }
12939         /* Ok, we will attempt a msgsnd :> */
12940         if (p) {
12941                 p->td_ru.ru_msgsnd++;
12942         }
12943         /* Are we aborting? */
12944         if (srcv->sinfo_flags & SCTP_ABORT) {
12945                 struct mbuf *mm;
12946                 int tot_demand, tot_out = 0, max_out;
12947
12948                 SCTP_STAT_INCR(sctps_sends_with_abort);
12949                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12950                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12951                         /* It has to be up before we abort */
12952                         /* how big is the user initiated abort? */
12953                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12954                         error = EINVAL;
12955                         goto out;
12956                 }
12957                 if (hold_tcblock) {
12958                         SCTP_TCB_UNLOCK(stcb);
12959                         hold_tcblock = 0;
12960                 }
12961                 if (top) {
12962                         struct mbuf *cntm = NULL;
12963
12964                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12965                         if (sndlen != 0) {
12966                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12967                                         tot_out += SCTP_BUF_LEN(cntm);
12968                                 }
12969                         }
12970                 } else {
12971                         /* Must fit in a MTU */
12972                         tot_out = sndlen;
12973                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12974                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12975                                 /* To big */
12976                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12977                                 error = EMSGSIZE;
12978                                 goto out;
12979                         }
12980                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12981                 }
12982                 if (mm == NULL) {
12983                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12984                         error = ENOMEM;
12985                         goto out;
12986                 }
12987                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12988                 max_out -= sizeof(struct sctp_abort_msg);
12989                 if (tot_out > max_out) {
12990                         tot_out = max_out;
12991                 }
12992                 if (mm) {
12993                         struct sctp_paramhdr *ph;
12994
12995                         /* now move forward the data pointer */
12996                         ph = mtod(mm, struct sctp_paramhdr *);
12997                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12998                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12999                         ph++;
13000                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
13001                         if (top == NULL) {
13002                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13003                                 if (error) {
13004                                         /*-
13005                                          * Here if we can't get his data we
13006                                          * still abort we just don't get to
13007                                          * send the users note :-0
13008                                          */
13009                                         sctp_m_freem(mm);
13010                                         mm = NULL;
13011                                 }
13012                         } else {
13013                                 if (sndlen != 0) {
13014                                         SCTP_BUF_NEXT(mm) = top;
13015                                 }
13016                         }
13017                 }
13018                 if (hold_tcblock == 0) {
13019                         SCTP_TCB_LOCK(stcb);
13020                 }
13021                 atomic_add_int(&stcb->asoc.refcnt, -1);
13022                 free_cnt_applied = 0;
13023                 /* release this lock, otherwise we hang on ourselves */
13024                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13025                 /* now relock the stcb so everything is sane */
13026                 hold_tcblock = 0;
13027                 stcb = NULL;
13028                 /*
13029                  * In this case top is already chained to mm avoid double
13030                  * free, since we free it below if top != NULL and driver
13031                  * would free it after sending the packet out
13032                  */
13033                 if (sndlen != 0) {
13034                         top = NULL;
13035                 }
13036                 goto out_unlocked;
13037         }
13038         /* Calculate the maximum we can send */
13039         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13040         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13041                 if (non_blocking) {
13042                         /* we already checked for non-blocking above. */
13043                         max_len = sndlen;
13044                 } else {
13045                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13046                 }
13047         } else {
13048                 max_len = 0;
13049         }
13050         if (hold_tcblock) {
13051                 SCTP_TCB_UNLOCK(stcb);
13052                 hold_tcblock = 0;
13053         }
13054         if (asoc->strmout == NULL) {
13055                 /* huh? software error */
13056                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13057                 error = EFAULT;
13058                 goto out_unlocked;
13059         }
13060         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13061         if ((user_marks_eor == 0) &&
13062             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13063                 /* It will NEVER fit */
13064                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13065                 error = EMSGSIZE;
13066                 goto out_unlocked;
13067         }
13068         if ((uio == NULL) && user_marks_eor) {
13069                 /*-
13070                  * We do not support eeor mode for
13071                  * sending with mbuf chains (like sendfile).
13072                  */
13073                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13074                 error = EINVAL;
13075                 goto out_unlocked;
13076         }
13077         if (user_marks_eor) {
13078                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13079         } else {
13080                 /*-
13081                  * For non-eeor the whole message must fit in
13082                  * the socket send buffer.
13083                  */
13084                 local_add_more = sndlen;
13085         }
13086         len = 0;
13087         if (non_blocking) {
13088                 goto skip_preblock;
13089         }
13090         if (((max_len <= local_add_more) &&
13091             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13092             (max_len == 0) ||
13093             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13094                 /* No room right now ! */
13095                 SOCKBUF_LOCK(&so->so_snd);
13096                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13097                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13098                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13099                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13100                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13101                             inqueue_bytes,
13102                             local_add_more,
13103                             stcb->asoc.stream_queue_cnt,
13104                             stcb->asoc.chunks_on_out_queue,
13105                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13106                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13107                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13108                         }
13109                         be.error = 0;
13110                         stcb->block_entry = &be;
13111                         error = sbwait(&so->so_snd);
13112                         stcb->block_entry = NULL;
13113                         if (error || so->so_error || be.error) {
13114                                 if (error == 0) {
13115                                         if (so->so_error)
13116                                                 error = so->so_error;
13117                                         if (be.error) {
13118                                                 error = be.error;
13119                                         }
13120                                 }
13121                                 SOCKBUF_UNLOCK(&so->so_snd);
13122                                 goto out_unlocked;
13123                         }
13124                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13125                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13126                                     asoc, stcb->asoc.total_output_queue_size);
13127                         }
13128                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13129                                 SOCKBUF_UNLOCK(&so->so_snd);
13130                                 goto out_unlocked;
13131                         }
13132                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13133                 }
13134                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13135                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13136                 } else {
13137                         max_len = 0;
13138                 }
13139                 SOCKBUF_UNLOCK(&so->so_snd);
13140         }
13141 skip_preblock:
13142         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13143                 goto out_unlocked;
13144         }
13145         /*
13146          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13147          * case NOTE: uio will be null when top/mbuf is passed
13148          */
13149         if (sndlen == 0) {
13150                 if (srcv->sinfo_flags & SCTP_EOF) {
13151                         got_all_of_the_send = 1;
13152                         goto dataless_eof;
13153                 } else {
13154                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13155                         error = EINVAL;
13156                         goto out;
13157                 }
13158         }
13159         if (top == NULL) {
13160                 struct sctp_stream_queue_pending *sp;
13161                 struct sctp_stream_out *strm;
13162                 uint32_t sndout;
13163
13164                 SCTP_TCB_SEND_LOCK(stcb);
13165                 if ((asoc->stream_locked) &&
13166                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13167                         SCTP_TCB_SEND_UNLOCK(stcb);
13168                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13169                         error = EINVAL;
13170                         goto out;
13171                 }
13172                 SCTP_TCB_SEND_UNLOCK(stcb);
13173
13174                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13175                 if (strm->last_msg_incomplete == 0) {
13176         do_a_copy_in:
13177                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13178                         if ((sp == NULL) || (error)) {
13179                                 goto out;
13180                         }
13181                         SCTP_TCB_SEND_LOCK(stcb);
13182                         if (sp->msg_is_complete) {
13183                                 strm->last_msg_incomplete = 0;
13184                                 asoc->stream_locked = 0;
13185                         } else {
13186                                 /*
13187                                  * Just got locked to this guy in case of an
13188                                  * interrupt.
13189                                  */
13190                                 strm->last_msg_incomplete = 1;
13191                                 if (stcb->asoc.idata_supported == 0) {
13192                                         asoc->stream_locked = 1;
13193                                         asoc->stream_locked_on = srcv->sinfo_stream;
13194                                 }
13195                                 sp->sender_all_done = 0;
13196                         }
13197                         sctp_snd_sb_alloc(stcb, sp->length);
13198                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13199                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13200                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13201                         }
13202                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13203                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13204                         SCTP_TCB_SEND_UNLOCK(stcb);
13205                 } else {
13206                         SCTP_TCB_SEND_LOCK(stcb);
13207                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13208                         SCTP_TCB_SEND_UNLOCK(stcb);
13209                         if (sp == NULL) {
13210                                 /* ???? Huh ??? last msg is gone */
13211 #ifdef INVARIANTS
13212                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13213 #else
13214                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13215                                 strm->last_msg_incomplete = 0;
13216 #endif
13217                                 goto do_a_copy_in;
13218
13219                         }
13220                 }
13221                 while (uio->uio_resid > 0) {
13222                         /* How much room do we have? */
13223                         struct mbuf *new_tail, *mm;
13224
13225                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13226                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13227                         else
13228                                 max_len = 0;
13229
13230                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13231                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13232                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13233                                 sndout = 0;
13234                                 new_tail = NULL;
13235                                 if (hold_tcblock) {
13236                                         SCTP_TCB_UNLOCK(stcb);
13237                                         hold_tcblock = 0;
13238                                 }
13239                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13240                                 if ((mm == NULL) || error) {
13241                                         if (mm) {
13242                                                 sctp_m_freem(mm);
13243                                         }
13244                                         goto out;
13245                                 }
13246                                 /* Update the mbuf and count */
13247                                 SCTP_TCB_SEND_LOCK(stcb);
13248                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13249                                         /*
13250                                          * we need to get out. Peer probably
13251                                          * aborted.
13252                                          */
13253                                         sctp_m_freem(mm);
13254                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13255                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13256                                                 error = ECONNRESET;
13257                                         }
13258                                         SCTP_TCB_SEND_UNLOCK(stcb);
13259                                         goto out;
13260                                 }
13261                                 if (sp->tail_mbuf) {
13262                                         /* tack it to the end */
13263                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13264                                         sp->tail_mbuf = new_tail;
13265                                 } else {
13266                                         /* A stolen mbuf */
13267                                         sp->data = mm;
13268                                         sp->tail_mbuf = new_tail;
13269                                 }
13270                                 sctp_snd_sb_alloc(stcb, sndout);
13271                                 atomic_add_int(&sp->length, sndout);
13272                                 len += sndout;
13273                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13274                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13275                                 }
13276                                 /* Did we reach EOR? */
13277                                 if ((uio->uio_resid == 0) &&
13278                                     ((user_marks_eor == 0) ||
13279                                     (srcv->sinfo_flags & SCTP_EOF) ||
13280                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13281                                         sp->msg_is_complete = 1;
13282                                 } else {
13283                                         sp->msg_is_complete = 0;
13284                                 }
13285                                 SCTP_TCB_SEND_UNLOCK(stcb);
13286                         }
13287                         if (uio->uio_resid == 0) {
13288                                 /* got it all? */
13289                                 continue;
13290                         }
13291                         /* PR-SCTP? */
13292                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13293                                 /*
13294                                  * This is ugly but we must assure locking
13295                                  * order
13296                                  */
13297                                 if (hold_tcblock == 0) {
13298                                         SCTP_TCB_LOCK(stcb);
13299                                         hold_tcblock = 1;
13300                                 }
13301                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13302                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13303                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13304                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13305                                 else
13306                                         max_len = 0;
13307                                 if (max_len > 0) {
13308                                         continue;
13309                                 }
13310                                 SCTP_TCB_UNLOCK(stcb);
13311                                 hold_tcblock = 0;
13312                         }
13313                         /* wait for space now */
13314                         if (non_blocking) {
13315                                 /* Non-blocking io in place out */
13316                                 goto skip_out_eof;
13317                         }
13318                         /* What about the INIT, send it maybe */
13319                         if (queue_only_for_init) {
13320                                 if (hold_tcblock == 0) {
13321                                         SCTP_TCB_LOCK(stcb);
13322                                         hold_tcblock = 1;
13323                                 }
13324                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13325                                         /* a collision took us forward? */
13326                                         queue_only = 0;
13327                                 } else {
13328                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13329                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13330                                         queue_only = 1;
13331                                 }
13332                         }
13333                         if ((net->flight_size > net->cwnd) &&
13334                             (asoc->sctp_cmt_on_off == 0)) {
13335                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13336                                 queue_only = 1;
13337                         } else if (asoc->ifp_had_enobuf) {
13338                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13339                                 if (net->flight_size > (2 * net->mtu)) {
13340                                         queue_only = 1;
13341                                 }
13342                                 asoc->ifp_had_enobuf = 0;
13343                         }
13344                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13345                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13346                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13347                             (stcb->asoc.total_flight > 0) &&
13348                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13349                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13350
13351                                 /*-
13352                                  * Ok, Nagle is set on and we have data outstanding.
13353                                  * Don't send anything and let SACKs drive out the
13354                                  * data unless we have a "full" segment to send.
13355                                  */
13356                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13357                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13358                                 }
13359                                 SCTP_STAT_INCR(sctps_naglequeued);
13360                                 nagle_applies = 1;
13361                         } else {
13362                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13363                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13364                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13365                                 }
13366                                 SCTP_STAT_INCR(sctps_naglesent);
13367                                 nagle_applies = 0;
13368                         }
13369                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13370
13371                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13372                                     nagle_applies, un_sent);
13373                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13374                                     stcb->asoc.total_flight,
13375                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13376                         }
13377                         if (queue_only_for_init)
13378                                 queue_only_for_init = 0;
13379                         if ((queue_only == 0) && (nagle_applies == 0)) {
13380                                 /*-
13381                                  * need to start chunk output
13382                                  * before blocking.. note that if
13383                                  * a lock is already applied, then
13384                                  * the input via the net is happening
13385                                  * and I don't need to start output :-D
13386                                  */
13387                                 if (hold_tcblock == 0) {
13388                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13389                                                 hold_tcblock = 1;
13390                                                 sctp_chunk_output(inp,
13391                                                     stcb,
13392                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13393                                         }
13394                                 } else {
13395                                         sctp_chunk_output(inp,
13396                                             stcb,
13397                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13398                                 }
13399                                 if (hold_tcblock == 1) {
13400                                         SCTP_TCB_UNLOCK(stcb);
13401                                         hold_tcblock = 0;
13402                                 }
13403                         }
13404                         SOCKBUF_LOCK(&so->so_snd);
13405                         /*-
13406                          * This is a bit strange, but I think it will
13407                          * work. The total_output_queue_size is locked and
13408                          * protected by the TCB_LOCK, which we just released.
13409                          * There is a race that can occur between releasing it
13410                          * above, and me getting the socket lock, where sacks
13411                          * come in but we have not put the SB_WAIT on the
13412                          * so_snd buffer to get the wakeup. After the LOCK
13413                          * is applied the sack_processing will also need to
13414                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13415                          * once we have the socket buffer lock if we recheck the
13416                          * size we KNOW we will get to sleep safely with the
13417                          * wakeup flag in place.
13418                          */
13419                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13420                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13421                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13422                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13423                                             asoc, (size_t)uio->uio_resid);
13424                                 }
13425                                 be.error = 0;
13426                                 stcb->block_entry = &be;
13427                                 error = sbwait(&so->so_snd);
13428                                 stcb->block_entry = NULL;
13429
13430                                 if (error || so->so_error || be.error) {
13431                                         if (error == 0) {
13432                                                 if (so->so_error)
13433                                                         error = so->so_error;
13434                                                 if (be.error) {
13435                                                         error = be.error;
13436                                                 }
13437                                         }
13438                                         SOCKBUF_UNLOCK(&so->so_snd);
13439                                         goto out_unlocked;
13440                                 }
13441                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13442                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13443                                             asoc, stcb->asoc.total_output_queue_size);
13444                                 }
13445                         }
13446                         SOCKBUF_UNLOCK(&so->so_snd);
13447                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13448                                 goto out_unlocked;
13449                         }
13450                 }
13451                 SCTP_TCB_SEND_LOCK(stcb);
13452                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13453                         SCTP_TCB_SEND_UNLOCK(stcb);
13454                         goto out_unlocked;
13455                 }
13456                 if (sp) {
13457                         if (sp->msg_is_complete == 0) {
13458                                 strm->last_msg_incomplete = 1;
13459                                 if (stcb->asoc.idata_supported == 0) {
13460                                         asoc->stream_locked = 1;
13461                                         asoc->stream_locked_on = srcv->sinfo_stream;
13462                                 }
13463                         } else {
13464                                 sp->sender_all_done = 1;
13465                                 strm->last_msg_incomplete = 0;
13466                                 asoc->stream_locked = 0;
13467                         }
13468                 } else {
13469                         SCTP_PRINTF("Huh no sp TSNH?\n");
13470                         strm->last_msg_incomplete = 0;
13471                         asoc->stream_locked = 0;
13472                 }
13473                 SCTP_TCB_SEND_UNLOCK(stcb);
13474                 if (uio->uio_resid == 0) {
13475                         got_all_of_the_send = 1;
13476                 }
13477         } else {
13478                 /* We send in a 0, since we do NOT have any locks */
13479                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13480                 top = NULL;
13481                 if (srcv->sinfo_flags & SCTP_EOF) {
13482                         /*
13483                          * This should only happen for Panda for the mbuf
13484                          * send case, which does NOT yet support EEOR mode.
13485                          * Thus, we can just set this flag to do the proper
13486                          * EOF handling.
13487                          */
13488                         got_all_of_the_send = 1;
13489                 }
13490         }
13491         if (error) {
13492                 goto out;
13493         }
13494 dataless_eof:
13495         /* EOF thing ? */
13496         if ((srcv->sinfo_flags & SCTP_EOF) &&
13497             (got_all_of_the_send == 1)) {
13498                 SCTP_STAT_INCR(sctps_sends_with_eof);
13499                 error = 0;
13500                 if (hold_tcblock == 0) {
13501                         SCTP_TCB_LOCK(stcb);
13502                         hold_tcblock = 1;
13503                 }
13504                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13505                     TAILQ_EMPTY(&asoc->sent_queue) &&
13506                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13507                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13508                                 goto abort_anyway;
13509                         }
13510                         /* there is nothing queued to send, so I'm done... */
13511                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13512                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13513                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13514                                 struct sctp_nets *netp;
13515
13516                                 /* only send SHUTDOWN the first time through */
13517                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13518                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13519                                 }
13520                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13521                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13522                                 sctp_stop_timers_for_shutdown(stcb);
13523                                 if (stcb->asoc.alternate) {
13524                                         netp = stcb->asoc.alternate;
13525                                 } else {
13526                                         netp = stcb->asoc.primary_destination;
13527                                 }
13528                                 sctp_send_shutdown(stcb, netp);
13529                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13530                                     netp);
13531                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13532                                     asoc->primary_destination);
13533                         }
13534                 } else {
13535                         /*-
13536                          * we still got (or just got) data to send, so set
13537                          * SHUTDOWN_PENDING
13538                          */
13539                         /*-
13540                          * XXX sockets draft says that SCTP_EOF should be
13541                          * sent with no data.  currently, we will allow user
13542                          * data to be sent first and move to
13543                          * SHUTDOWN-PENDING
13544                          */
13545                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13546                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13547                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13548                                 if (hold_tcblock == 0) {
13549                                         SCTP_TCB_LOCK(stcb);
13550                                         hold_tcblock = 1;
13551                                 }
13552                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13553                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13554                                 }
13555                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13556                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13557                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13558                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13559                                         struct mbuf *op_err;
13560                                         char msg[SCTP_DIAG_INFO_LEN];
13561
13562                         abort_anyway:
13563                                         if (free_cnt_applied) {
13564                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13565                                                 free_cnt_applied = 0;
13566                                         }
13567                                         snprintf(msg, sizeof(msg),
13568                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13569                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13570                                             msg);
13571                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13572                                             op_err, SCTP_SO_LOCKED);
13573                                         /*
13574                                          * now relock the stcb so everything
13575                                          * is sane
13576                                          */
13577                                         hold_tcblock = 0;
13578                                         stcb = NULL;
13579                                         goto out;
13580                                 }
13581                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13582                                     asoc->primary_destination);
13583                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13584                         }
13585                 }
13586         }
13587 skip_out_eof:
13588         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13589                 some_on_control = 1;
13590         }
13591         if (queue_only_for_init) {
13592                 if (hold_tcblock == 0) {
13593                         SCTP_TCB_LOCK(stcb);
13594                         hold_tcblock = 1;
13595                 }
13596                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13597                         /* a collision took us forward? */
13598                         queue_only = 0;
13599                 } else {
13600                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13601                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13602                         queue_only = 1;
13603                 }
13604         }
13605         if ((net->flight_size > net->cwnd) &&
13606             (stcb->asoc.sctp_cmt_on_off == 0)) {
13607                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13608                 queue_only = 1;
13609         } else if (asoc->ifp_had_enobuf) {
13610                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13611                 if (net->flight_size > (2 * net->mtu)) {
13612                         queue_only = 1;
13613                 }
13614                 asoc->ifp_had_enobuf = 0;
13615         }
13616         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13617             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13618         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13619             (stcb->asoc.total_flight > 0) &&
13620             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13621             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13622                 /*-
13623                  * Ok, Nagle is set on and we have data outstanding.
13624                  * Don't send anything and let SACKs drive out the
13625                  * data unless wen have a "full" segment to send.
13626                  */
13627                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13628                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13629                 }
13630                 SCTP_STAT_INCR(sctps_naglequeued);
13631                 nagle_applies = 1;
13632         } else {
13633                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13634                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13635                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13636                 }
13637                 SCTP_STAT_INCR(sctps_naglesent);
13638                 nagle_applies = 0;
13639         }
13640         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13641                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13642                     nagle_applies, un_sent);
13643                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13644                     stcb->asoc.total_flight,
13645                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13646         }
13647         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13648                 /* we can attempt to send too. */
13649                 if (hold_tcblock == 0) {
13650                         /*
13651                          * If there is activity recv'ing sacks no need to
13652                          * send
13653                          */
13654                         if (SCTP_TCB_TRYLOCK(stcb)) {
13655                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13656                                 hold_tcblock = 1;
13657                         }
13658                 } else {
13659                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13660                 }
13661         } else if ((queue_only == 0) &&
13662                     (stcb->asoc.peers_rwnd == 0) &&
13663             (stcb->asoc.total_flight == 0)) {
13664                 /* We get to have a probe outstanding */
13665                 if (hold_tcblock == 0) {
13666                         hold_tcblock = 1;
13667                         SCTP_TCB_LOCK(stcb);
13668                 }
13669                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13670         } else if (some_on_control) {
13671                 int num_out, reason, frag_point;
13672
13673                 /* Here we do control only */
13674                 if (hold_tcblock == 0) {
13675                         hold_tcblock = 1;
13676                         SCTP_TCB_LOCK(stcb);
13677                 }
13678                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13679                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13680                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13681         }
13682         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13683             queue_only, stcb->asoc.peers_rwnd, un_sent,
13684             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13685             stcb->asoc.total_output_queue_size, error);
13686
13687 out:
13688 out_unlocked:
13689
13690         if (local_soresv && stcb) {
13691                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13692         }
13693         if (create_lock_applied) {
13694                 SCTP_ASOC_CREATE_UNLOCK(inp);
13695         }
13696         if ((stcb) && hold_tcblock) {
13697                 SCTP_TCB_UNLOCK(stcb);
13698         }
13699         if (stcb && free_cnt_applied) {
13700                 atomic_add_int(&stcb->asoc.refcnt, -1);
13701         }
13702 #ifdef INVARIANTS
13703         if (stcb) {
13704                 if (mtx_owned(&stcb->tcb_mtx)) {
13705                         panic("Leaving with tcb mtx owned?");
13706                 }
13707                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13708                         panic("Leaving with tcb send mtx owned?");
13709                 }
13710         }
13711 #endif
13712         if (top) {
13713                 sctp_m_freem(top);
13714         }
13715         if (control) {
13716                 sctp_m_freem(control);
13717         }
13718         return (error);
13719 }
13720
13721
13722 /*
13723  * generate an AUTHentication chunk, if required
13724  */
13725 struct mbuf *
13726 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13727     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13728     struct sctp_tcb *stcb, uint8_t chunk)
13729 {
13730         struct mbuf *m_auth;
13731         struct sctp_auth_chunk *auth;
13732         int chunk_len;
13733         struct mbuf *cn;
13734
13735         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13736             (stcb == NULL))
13737                 return (m);
13738
13739         if (stcb->asoc.auth_supported == 0) {
13740                 return (m);
13741         }
13742         /* does the requested chunk require auth? */
13743         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13744                 return (m);
13745         }
13746         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13747         if (m_auth == NULL) {
13748                 /* no mbuf's */
13749                 return (m);
13750         }
13751         /* reserve some space if this will be the first mbuf */
13752         if (m == NULL)
13753                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13754         /* fill in the AUTH chunk details */
13755         auth = mtod(m_auth, struct sctp_auth_chunk *);
13756         bzero(auth, sizeof(*auth));
13757         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13758         auth->ch.chunk_flags = 0;
13759         chunk_len = sizeof(*auth) +
13760             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13761         auth->ch.chunk_length = htons(chunk_len);
13762         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13763         /* key id and hmac digest will be computed and filled in upon send */
13764
13765         /* save the offset where the auth was inserted into the chain */
13766         *offset = 0;
13767         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13768                 *offset += SCTP_BUF_LEN(cn);
13769         }
13770
13771         /* update length and return pointer to the auth chunk */
13772         SCTP_BUF_LEN(m_auth) = chunk_len;
13773         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13774         if (auth_ret != NULL)
13775                 *auth_ret = auth;
13776
13777         return (m);
13778 }
13779
13780 #ifdef INET6
13781 int
13782 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13783 {
13784         struct nd_prefix *pfx = NULL;
13785         struct nd_pfxrouter *pfxrtr = NULL;
13786         struct sockaddr_in6 gw6;
13787
13788         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13789                 return (0);
13790
13791         /* get prefix entry of address */
13792         ND6_RLOCK();
13793         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13794                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13795                         continue;
13796                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13797                     &src6->sin6_addr, &pfx->ndpr_mask))
13798                         break;
13799         }
13800         /* no prefix entry in the prefix list */
13801         if (pfx == NULL) {
13802                 ND6_RUNLOCK();
13803                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13804                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13805                 return (0);
13806         }
13807         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13808         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13809
13810         /* search installed gateway from prefix entry */
13811         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13812                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13813                 gw6.sin6_family = AF_INET6;
13814                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13815                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13816                     sizeof(struct in6_addr));
13817                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13818                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13819                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13820                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13821                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13822                         ND6_RUNLOCK();
13823                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13824                         return (1);
13825                 }
13826         }
13827         ND6_RUNLOCK();
13828         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13829         return (0);
13830 }
13831 #endif
13832
13833 int
13834 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13835 {
13836 #ifdef INET
13837         struct sockaddr_in *sin, *mask;
13838         struct ifaddr *ifa;
13839         struct in_addr srcnetaddr, gwnetaddr;
13840
13841         if (ro == NULL || ro->ro_rt == NULL ||
13842             sifa->address.sa.sa_family != AF_INET) {
13843                 return (0);
13844         }
13845         ifa = (struct ifaddr *)sifa->ifa;
13846         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13847         sin = &sifa->address.sin;
13848         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13849         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13850         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13851         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13852
13853         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13854         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13855         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13856         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13857         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13858         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13859                 return (1);
13860         }
13861 #endif
13862         return (0);
13863 }