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 (mtu > 0) {
4281                                                 if (net->port) {
4282                                                         mtu -= sizeof(struct udphdr);
4283                                                 }
4284                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4285                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4286                                                 }
4287                                                 net->mtu = mtu;
4288                                         }
4289                                 } else if (ro->ro_rt == NULL) {
4290                                         /* route was freed */
4291                                         if (net->ro._s_addr &&
4292                                             net->src_addr_selected) {
4293                                                 sctp_free_ifa(net->ro._s_addr);
4294                                                 net->ro._s_addr = NULL;
4295                                         }
4296                                         net->src_addr_selected = 0;
4297                                 }
4298                         }
4299                         return (ret);
4300                 }
4301 #endif
4302 #ifdef INET6
4303         case AF_INET6:
4304                 {
4305                         uint32_t flowlabel, flowinfo;
4306                         struct ip6_hdr *ip6h;
4307                         struct route_in6 ip6route;
4308                         struct ifnet *ifp;
4309                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4310                         int prev_scope = 0;
4311                         struct sockaddr_in6 lsa6_storage;
4312                         int error;
4313                         u_short prev_port = 0;
4314                         int len;
4315
4316                         if (net) {
4317                                 flowlabel = net->flowlabel;
4318                         } else if (stcb) {
4319                                 flowlabel = stcb->asoc.default_flowlabel;
4320                         } else {
4321                                 flowlabel = inp->sctp_ep.default_flowlabel;
4322                         }
4323                         if (flowlabel == 0) {
4324                                 /*
4325                                  * This means especially, that it is not set
4326                                  * at the SCTP layer. So use the value from
4327                                  * the IP layer.
4328                                  */
4329                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4330                         }
4331                         flowlabel &= 0x000fffff;
4332                         len = SCTP_MIN_OVERHEAD;
4333                         if (port) {
4334                                 len += sizeof(struct udphdr);
4335                         }
4336                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4337                         if (newm == NULL) {
4338                                 sctp_m_freem(m);
4339                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4340                                 return (ENOMEM);
4341                         }
4342                         SCTP_ALIGN_TO_END(newm, len);
4343                         SCTP_BUF_LEN(newm) = len;
4344                         SCTP_BUF_NEXT(newm) = m;
4345                         m = newm;
4346                         if (net != NULL) {
4347                                 m->m_pkthdr.flowid = net->flowid;
4348                                 M_HASHTYPE_SET(m, net->flowtype);
4349                         } else {
4350                                 m->m_pkthdr.flowid = mflowid;
4351                                 M_HASHTYPE_SET(m, mflowtype);
4352                         }
4353                         packet_length = sctp_calculate_len(m);
4354
4355                         ip6h = mtod(m, struct ip6_hdr *);
4356                         /* protect *sin6 from overwrite */
4357                         sin6 = (struct sockaddr_in6 *)to;
4358                         tmp = *sin6;
4359                         sin6 = &tmp;
4360
4361                         /* KAME hack: embed scopeid */
4362                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4363                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4364                                 return (EINVAL);
4365                         }
4366                         if (net == NULL) {
4367                                 memset(&ip6route, 0, sizeof(ip6route));
4368                                 ro = (sctp_route_t *)&ip6route;
4369                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4370                         } else {
4371                                 ro = (sctp_route_t *)&net->ro;
4372                         }
4373                         /*
4374                          * We assume here that inp_flow is in host byte
4375                          * order within the TCB!
4376                          */
4377                         if (tos_value == 0) {
4378                                 /*
4379                                  * This means especially, that it is not set
4380                                  * at the SCTP layer. So use the value from
4381                                  * the IP layer.
4382                                  */
4383                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4384                         }
4385                         tos_value &= 0xfc;
4386                         if (ecn_ok) {
4387                                 tos_value |= sctp_get_ect(stcb);
4388                         }
4389                         flowinfo = 0x06;
4390                         flowinfo <<= 8;
4391                         flowinfo |= tos_value;
4392                         flowinfo <<= 20;
4393                         flowinfo |= flowlabel;
4394                         ip6h->ip6_flow = htonl(flowinfo);
4395                         if (port) {
4396                                 ip6h->ip6_nxt = IPPROTO_UDP;
4397                         } else {
4398                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4399                         }
4400                         ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4401                         ip6h->ip6_dst = sin6->sin6_addr;
4402
4403                         /*
4404                          * Add SRC address selection here: we can only reuse
4405                          * to a limited degree the kame src-addr-sel, since
4406                          * we can try their selection but it may not be
4407                          * bound.
4408                          */
4409                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4410                         lsa6_tmp.sin6_family = AF_INET6;
4411                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4412                         lsa6 = &lsa6_tmp;
4413                         if (net && out_of_asoc_ok == 0) {
4414                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4415                                         sctp_free_ifa(net->ro._s_addr);
4416                                         net->ro._s_addr = NULL;
4417                                         net->src_addr_selected = 0;
4418                                         if (ro->ro_rt) {
4419                                                 RTFREE(ro->ro_rt);
4420                                                 ro->ro_rt = NULL;
4421                                         }
4422                                 }
4423                                 if (net->src_addr_selected == 0) {
4424                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4425                                         /* KAME hack: embed scopeid */
4426                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4427                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4428                                                 return (EINVAL);
4429                                         }
4430                                         /* Cache the source address */
4431                                         net->ro._s_addr = sctp_source_address_selection(inp,
4432                                             stcb,
4433                                             ro,
4434                                             net,
4435                                             0,
4436                                             vrf_id);
4437                                         (void)sa6_recoverscope(sin6);
4438                                         net->src_addr_selected = 1;
4439                                 }
4440                                 if (net->ro._s_addr == NULL) {
4441                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4442                                         net->src_addr_selected = 0;
4443                                         sctp_handle_no_route(stcb, net, so_locked);
4444                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4445                                         sctp_m_freem(m);
4446                                         return (EHOSTUNREACH);
4447                                 }
4448                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4449                         } else {
4450                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4451                                 /* KAME hack: embed scopeid */
4452                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4453                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4454                                         return (EINVAL);
4455                                 }
4456                                 if (over_addr == NULL) {
4457                                         struct sctp_ifa *_lsrc;
4458
4459                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4460                                             net,
4461                                             out_of_asoc_ok,
4462                                             vrf_id);
4463                                         if (_lsrc == NULL) {
4464                                                 sctp_handle_no_route(stcb, net, so_locked);
4465                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4466                                                 sctp_m_freem(m);
4467                                                 return (EHOSTUNREACH);
4468                                         }
4469                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4470                                         sctp_free_ifa(_lsrc);
4471                                 } else {
4472                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4473                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4474                                 }
4475                                 (void)sa6_recoverscope(sin6);
4476                         }
4477                         lsa6->sin6_port = inp->sctp_lport;
4478
4479                         if (ro->ro_rt == NULL) {
4480                                 /*
4481                                  * src addr selection failed to find a route
4482                                  * (or valid source addr), so we can't get
4483                                  * there from here!
4484                                  */
4485                                 sctp_handle_no_route(stcb, net, so_locked);
4486                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4487                                 sctp_m_freem(m);
4488                                 return (EHOSTUNREACH);
4489                         }
4490                         /*
4491                          * XXX: sa6 may not have a valid sin6_scope_id in
4492                          * the non-SCOPEDROUTING case.
4493                          */
4494                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4495                         lsa6_storage.sin6_family = AF_INET6;
4496                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4497                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4498                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4499                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4500                                 sctp_m_freem(m);
4501                                 return (error);
4502                         }
4503                         /* XXX */
4504                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4505                         lsa6_storage.sin6_port = inp->sctp_lport;
4506                         lsa6 = &lsa6_storage;
4507                         ip6h->ip6_src = lsa6->sin6_addr;
4508
4509                         if (port) {
4510                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4511                                         sctp_handle_no_route(stcb, net, so_locked);
4512                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4513                                         sctp_m_freem(m);
4514                                         return (EHOSTUNREACH);
4515                                 }
4516                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4517                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4518                                 udp->uh_dport = port;
4519                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4520                                 udp->uh_sum = 0;
4521                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4522                         } else {
4523                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4524                         }
4525
4526                         sctphdr->src_port = src_port;
4527                         sctphdr->dest_port = dest_port;
4528                         sctphdr->v_tag = v_tag;
4529                         sctphdr->checksum = 0;
4530
4531                         /*
4532                          * We set the hop limit now since there is a good
4533                          * chance that our ro pointer is now filled
4534                          */
4535                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4536                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4537
4538 #ifdef SCTP_DEBUG
4539                         /* Copy to be sure something bad is not happening */
4540                         sin6->sin6_addr = ip6h->ip6_dst;
4541                         lsa6->sin6_addr = ip6h->ip6_src;
4542 #endif
4543
4544                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4546                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4547                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4548                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4549                         if (net) {
4550                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4551                                 /*
4552                                  * preserve the port and scope for link
4553                                  * local send
4554                                  */
4555                                 prev_scope = sin6->sin6_scope_id;
4556                                 prev_port = sin6->sin6_port;
4557                         }
4558                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4559                                 /* failed to prepend data, give up */
4560                                 sctp_m_freem(m);
4561                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4562                                 return (ENOMEM);
4563                         }
4564                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4565                         if (port) {
4566 #if defined(SCTP_WITH_NO_CSUM)
4567                                 SCTP_STAT_INCR(sctps_sendnocrc);
4568 #else
4569                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4570                                 SCTP_STAT_INCR(sctps_sendswcrc);
4571 #endif
4572                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4573                                         udp->uh_sum = 0xffff;
4574                                 }
4575                         } else {
4576 #if defined(SCTP_WITH_NO_CSUM)
4577                                 SCTP_STAT_INCR(sctps_sendnocrc);
4578 #else
4579                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4580                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4581                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4582 #endif
4583                         }
4584                         /* send it out. table id is taken from stcb */
4585 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4586                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4587                                 so = SCTP_INP_SO(inp);
4588                                 SCTP_SOCKET_UNLOCK(so, 0);
4589                         }
4590 #endif
4591 #ifdef SCTP_PACKET_LOGGING
4592                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4593                                 sctp_packet_log(o_pak);
4594 #endif
4595                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4596 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4597                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4598                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4599                                 SCTP_TCB_UNLOCK(stcb);
4600                                 SCTP_SOCKET_LOCK(so, 0);
4601                                 SCTP_TCB_LOCK(stcb);
4602                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4603                         }
4604 #endif
4605                         if (net) {
4606                                 /* for link local this must be done */
4607                                 sin6->sin6_scope_id = prev_scope;
4608                                 sin6->sin6_port = prev_port;
4609                         }
4610                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4611                         SCTP_STAT_INCR(sctps_sendpackets);
4612                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4613                         if (ret) {
4614                                 SCTP_STAT_INCR(sctps_senderrors);
4615                         }
4616                         if (net == NULL) {
4617                                 /* Now if we had a temp route free it */
4618                                 RO_RTFREE(ro);
4619                         } else {
4620                                 /*
4621                                  * PMTU check versus smallest asoc MTU goes
4622                                  * here
4623                                  */
4624                                 if (ro->ro_rt == NULL) {
4625                                         /* Route was freed */
4626                                         if (net->ro._s_addr &&
4627                                             net->src_addr_selected) {
4628                                                 sctp_free_ifa(net->ro._s_addr);
4629                                                 net->ro._s_addr = NULL;
4630                                         }
4631                                         net->src_addr_selected = 0;
4632                                 }
4633                                 if ((ro->ro_rt != NULL) &&
4634                                     (net->ro._s_addr)) {
4635                                         uint32_t mtu;
4636
4637                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4638                                         if (mtu > 0) {
4639                                                 if (net->port) {
4640                                                         mtu -= sizeof(struct udphdr);
4641                                                 }
4642                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4643                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4644                                                 }
4645                                                 net->mtu = mtu;
4646                                         }
4647                                 } else if (ifp) {
4648                                         if (ND_IFINFO(ifp)->linkmtu &&
4649                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4650                                                 sctp_mtu_size_reset(inp,
4651                                                     &stcb->asoc,
4652                                                     ND_IFINFO(ifp)->linkmtu);
4653                                         }
4654                                 }
4655                         }
4656                         return (ret);
4657                 }
4658 #endif
4659         default:
4660                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4661                     ((struct sockaddr *)to)->sa_family);
4662                 sctp_m_freem(m);
4663                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4664                 return (EFAULT);
4665         }
4666 }
4667
4668
4669 void
4670 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4671 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4672     SCTP_UNUSED
4673 #endif
4674 )
4675 {
4676         struct mbuf *m, *m_last;
4677         struct sctp_nets *net;
4678         struct sctp_init_chunk *init;
4679         struct sctp_supported_addr_param *sup_addr;
4680         struct sctp_adaptation_layer_indication *ali;
4681         struct sctp_supported_chunk_types_param *pr_supported;
4682         struct sctp_paramhdr *ph;
4683         int cnt_inits_to = 0;
4684         int error;
4685         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4686
4687         /* INIT's always go to the primary (and usually ONLY address) */
4688         net = stcb->asoc.primary_destination;
4689         if (net == NULL) {
4690                 net = TAILQ_FIRST(&stcb->asoc.nets);
4691                 if (net == NULL) {
4692                         /* TSNH */
4693                         return;
4694                 }
4695                 /* we confirm any address we send an INIT to */
4696                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4697                 (void)sctp_set_primary_addr(stcb, NULL, net);
4698         } else {
4699                 /* we confirm any address we send an INIT to */
4700                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4701         }
4702         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4703 #ifdef INET6
4704         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4705                 /*
4706                  * special hook, if we are sending to link local it will not
4707                  * show up in our private address count.
4708                  */
4709                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4710                         cnt_inits_to = 1;
4711         }
4712 #endif
4713         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4714                 /* This case should not happen */
4715                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4716                 return;
4717         }
4718         /* start the INIT timer */
4719         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4720
4721         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4722         if (m == NULL) {
4723                 /* No memory, INIT timer will re-attempt. */
4724                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4725                 return;
4726         }
4727         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4728         padding_len = 0;
4729         /* Now lets put the chunk header in place */
4730         init = mtod(m, struct sctp_init_chunk *);
4731         /* now the chunk header */
4732         init->ch.chunk_type = SCTP_INITIATION;
4733         init->ch.chunk_flags = 0;
4734         /* fill in later from mbuf we build */
4735         init->ch.chunk_length = 0;
4736         /* place in my tag */
4737         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4738         /* set up some of the credits. */
4739         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4740             SCTP_MINIMAL_RWND));
4741         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4742         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4743         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4744
4745         /* Adaptation layer indication parameter */
4746         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4747                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4748                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4749                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4750                 ali->ph.param_length = htons(parameter_len);
4751                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4752                 chunk_len += parameter_len;
4753         }
4754         /* ECN parameter */
4755         if (stcb->asoc.ecn_supported == 1) {
4756                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4757                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4758                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4759                 ph->param_length = htons(parameter_len);
4760                 chunk_len += parameter_len;
4761         }
4762         /* PR-SCTP supported parameter */
4763         if (stcb->asoc.prsctp_supported == 1) {
4764                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4765                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4766                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4767                 ph->param_length = htons(parameter_len);
4768                 chunk_len += parameter_len;
4769         }
4770         /* Add NAT friendly parameter. */
4771         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4772                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4773                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4774                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4775                 ph->param_length = htons(parameter_len);
4776                 chunk_len += parameter_len;
4777         }
4778         /* And now tell the peer which extensions we support */
4779         num_ext = 0;
4780         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4781         if (stcb->asoc.prsctp_supported == 1) {
4782                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4783                 if (stcb->asoc.idata_supported) {
4784                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4785                 }
4786         }
4787         if (stcb->asoc.auth_supported == 1) {
4788                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4789         }
4790         if (stcb->asoc.asconf_supported == 1) {
4791                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4792                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4793         }
4794         if (stcb->asoc.reconfig_supported == 1) {
4795                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4796         }
4797         if (stcb->asoc.idata_supported) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4799         }
4800         if (stcb->asoc.nrsack_supported == 1) {
4801                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4802         }
4803         if (stcb->asoc.pktdrop_supported == 1) {
4804                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4805         }
4806         if (num_ext > 0) {
4807                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4808                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4809                 pr_supported->ph.param_length = htons(parameter_len);
4810                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4811                 chunk_len += parameter_len;
4812         }
4813         /* add authentication parameters */
4814         if (stcb->asoc.auth_supported) {
4815                 /* attach RANDOM parameter, if available */
4816                 if (stcb->asoc.authinfo.random != NULL) {
4817                         struct sctp_auth_random *randp;
4818
4819                         if (padding_len > 0) {
4820                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4821                                 chunk_len += padding_len;
4822                                 padding_len = 0;
4823                         }
4824                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4825                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4826                         /* random key already contains the header */
4827                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4828                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4829                         chunk_len += parameter_len;
4830                 }
4831                 /* add HMAC_ALGO parameter */
4832                 if (stcb->asoc.local_hmacs != NULL) {
4833                         struct sctp_auth_hmac_algo *hmacs;
4834
4835                         if (padding_len > 0) {
4836                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4837                                 chunk_len += padding_len;
4838                                 padding_len = 0;
4839                         }
4840                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4841                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4842                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4843                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4844                         hmacs->ph.param_length = htons(parameter_len);
4845                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4846                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4847                         chunk_len += parameter_len;
4848                 }
4849                 /* add CHUNKS parameter */
4850                 if (stcb->asoc.local_auth_chunks != NULL) {
4851                         struct sctp_auth_chunk_list *chunks;
4852
4853                         if (padding_len > 0) {
4854                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4855                                 chunk_len += padding_len;
4856                                 padding_len = 0;
4857                         }
4858                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4859                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4860                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4861                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4862                         chunks->ph.param_length = htons(parameter_len);
4863                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4864                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4865                         chunk_len += parameter_len;
4866                 }
4867         }
4868         /* now any cookie time extensions */
4869         if (stcb->asoc.cookie_preserve_req) {
4870                 struct sctp_cookie_perserve_param *cookie_preserve;
4871
4872                 if (padding_len > 0) {
4873                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4874                         chunk_len += padding_len;
4875                         padding_len = 0;
4876                 }
4877                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4878                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4879                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4880                 cookie_preserve->ph.param_length = htons(parameter_len);
4881                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4882                 stcb->asoc.cookie_preserve_req = 0;
4883                 chunk_len += parameter_len;
4884         }
4885         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4886                 uint8_t i;
4887
4888                 if (padding_len > 0) {
4889                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4890                         chunk_len += padding_len;
4891                         padding_len = 0;
4892                 }
4893                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4894                 if (stcb->asoc.scope.ipv4_addr_legal) {
4895                         parameter_len += (uint16_t)sizeof(uint16_t);
4896                 }
4897                 if (stcb->asoc.scope.ipv6_addr_legal) {
4898                         parameter_len += (uint16_t)sizeof(uint16_t);
4899                 }
4900                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4901                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4902                 sup_addr->ph.param_length = htons(parameter_len);
4903                 i = 0;
4904                 if (stcb->asoc.scope.ipv4_addr_legal) {
4905                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4906                 }
4907                 if (stcb->asoc.scope.ipv6_addr_legal) {
4908                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4909                 }
4910                 padding_len = 4 - 2 * i;
4911                 chunk_len += parameter_len;
4912         }
4913         SCTP_BUF_LEN(m) = chunk_len;
4914         /* now the addresses */
4915         /*
4916          * To optimize this we could put the scoping stuff into a structure
4917          * and remove the individual uint8's from the assoc structure. Then
4918          * we could just sifa in the address within the stcb. But for now
4919          * this is a quick hack to get the address stuff teased apart.
4920          */
4921         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4922             m, cnt_inits_to,
4923             &padding_len, &chunk_len);
4924
4925         init->ch.chunk_length = htons(chunk_len);
4926         if (padding_len > 0) {
4927                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4928                         sctp_m_freem(m);
4929                         return;
4930                 }
4931         }
4932         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4933         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4934             (struct sockaddr *)&net->ro._l_addr,
4935             m, 0, NULL, 0, 0, 0, 0,
4936             inp->sctp_lport, stcb->rport, htonl(0),
4937             net->port, NULL,
4938             0, 0,
4939             so_locked))) {
4940                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4941                 if (error == ENOBUFS) {
4942                         stcb->asoc.ifp_had_enobuf = 1;
4943                         SCTP_STAT_INCR(sctps_lowlevelerr);
4944                 }
4945         } else {
4946                 stcb->asoc.ifp_had_enobuf = 0;
4947         }
4948         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4949         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4950 }
4951
4952 struct mbuf *
4953 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4954     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4955 {
4956         /*
4957          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4958          * being equal to the beginning of the params i.e. (iphlen +
4959          * sizeof(struct sctp_init_msg) parse through the parameters to the
4960          * end of the mbuf verifying that all parameters are known.
4961          *
4962          * For unknown parameters build and return a mbuf with
4963          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4964          * processing this chunk stop, and set *abort_processing to 1.
4965          *
4966          * By having param_offset be pre-set to where parameters begin it is
4967          * hoped that this routine may be reused in the future by new
4968          * features.
4969          */
4970         struct sctp_paramhdr *phdr, params;
4971
4972         struct mbuf *mat, *op_err;
4973         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4974         int at, limit, pad_needed;
4975         uint16_t ptype, plen, padded_size;
4976         int err_at;
4977
4978         *abort_processing = 0;
4979         mat = in_initpkt;
4980         err_at = 0;
4981         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4982         at = param_offset;
4983         op_err = NULL;
4984         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4985         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4986         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4987                 ptype = ntohs(phdr->param_type);
4988                 plen = ntohs(phdr->param_length);
4989                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4990                         /* wacked parameter */
4991                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4992                         goto invalid_size;
4993                 }
4994                 limit -= SCTP_SIZE32(plen);
4995                 /*-
4996                  * All parameters for all chunks that we know/understand are
4997                  * listed here. We process them other places and make
4998                  * appropriate stop actions per the upper bits. However this
4999                  * is the generic routine processor's can call to get back
5000                  * an operr.. to either incorporate (init-ack) or send.
5001                  */
5002                 padded_size = SCTP_SIZE32(plen);
5003                 switch (ptype) {
5004                         /* Param's with variable size */
5005                 case SCTP_HEARTBEAT_INFO:
5006                 case SCTP_STATE_COOKIE:
5007                 case SCTP_UNRECOG_PARAM:
5008                 case SCTP_ERROR_CAUSE_IND:
5009                         /* ok skip fwd */
5010                         at += padded_size;
5011                         break;
5012                         /* Param's with variable size within a range */
5013                 case SCTP_CHUNK_LIST:
5014                 case SCTP_SUPPORTED_CHUNK_EXT:
5015                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5016                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5017                                 goto invalid_size;
5018                         }
5019                         at += padded_size;
5020                         break;
5021                 case SCTP_SUPPORTED_ADDRTYPE:
5022                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5023                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5024                                 goto invalid_size;
5025                         }
5026                         at += padded_size;
5027                         break;
5028                 case SCTP_RANDOM:
5029                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5030                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5031                                 goto invalid_size;
5032                         }
5033                         at += padded_size;
5034                         break;
5035                 case SCTP_SET_PRIM_ADDR:
5036                 case SCTP_DEL_IP_ADDRESS:
5037                 case SCTP_ADD_IP_ADDRESS:
5038                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5039                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5040                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5041                                 goto invalid_size;
5042                         }
5043                         at += padded_size;
5044                         break;
5045                         /* Param's with a fixed size */
5046                 case SCTP_IPV4_ADDRESS:
5047                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5048                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5049                                 goto invalid_size;
5050                         }
5051                         at += padded_size;
5052                         break;
5053                 case SCTP_IPV6_ADDRESS:
5054                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5055                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5056                                 goto invalid_size;
5057                         }
5058                         at += padded_size;
5059                         break;
5060                 case SCTP_COOKIE_PRESERVE:
5061                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5062                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5063                                 goto invalid_size;
5064                         }
5065                         at += padded_size;
5066                         break;
5067                 case SCTP_HAS_NAT_SUPPORT:
5068                         *nat_friendly = 1;
5069                         /* fall through */
5070                 case SCTP_PRSCTP_SUPPORTED:
5071                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5072                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5073                                 goto invalid_size;
5074                         }
5075                         at += padded_size;
5076                         break;
5077                 case SCTP_ECN_CAPABLE:
5078                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5079                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5080                                 goto invalid_size;
5081                         }
5082                         at += padded_size;
5083                         break;
5084                 case SCTP_ULP_ADAPTATION:
5085                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5086                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5087                                 goto invalid_size;
5088                         }
5089                         at += padded_size;
5090                         break;
5091                 case SCTP_SUCCESS_REPORT:
5092                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5093                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5094                                 goto invalid_size;
5095                         }
5096                         at += padded_size;
5097                         break;
5098                 case SCTP_HOSTNAME_ADDRESS:
5099                         {
5100                                 /* We can NOT handle HOST NAME addresses!! */
5101                                 int l_len;
5102
5103                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5104                                 *abort_processing = 1;
5105                                 if (op_err == NULL) {
5106                                         /* Ok need to try to get a mbuf */
5107 #ifdef INET6
5108                                         l_len = SCTP_MIN_OVERHEAD;
5109 #else
5110                                         l_len = SCTP_MIN_V4_OVERHEAD;
5111 #endif
5112                                         l_len += sizeof(struct sctp_chunkhdr);
5113                                         l_len += plen;
5114                                         l_len += sizeof(struct sctp_paramhdr);
5115                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5116                                         if (op_err) {
5117                                                 SCTP_BUF_LEN(op_err) = 0;
5118                                                 /*
5119                                                  * pre-reserve space for ip
5120                                                  * and sctp header  and
5121                                                  * chunk hdr
5122                                                  */
5123 #ifdef INET6
5124                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5125 #else
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5127 #endif
5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5130                                         }
5131                                 }
5132                                 if (op_err) {
5133                                         /* If we have space */
5134                                         struct sctp_paramhdr s;
5135
5136                                         if (err_at % 4) {
5137                                                 uint32_t cpthis = 0;
5138
5139                                                 pad_needed = 4 - (err_at % 4);
5140                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5141                                                 err_at += pad_needed;
5142                                         }
5143                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5144                                         s.param_length = htons(sizeof(s) + plen);
5145                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5146                                         err_at += sizeof(s);
5147                                         if (plen > sizeof(tempbuf)) {
5148                                                 plen = sizeof(tempbuf);
5149                                         }
5150                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5151                                         if (phdr == NULL) {
5152                                                 sctp_m_freem(op_err);
5153                                                 /*
5154                                                  * we are out of memory but
5155                                                  * we still need to have a
5156                                                  * look at what to do (the
5157                                                  * system is in trouble
5158                                                  * though).
5159                                                  */
5160                                                 return (NULL);
5161                                         }
5162                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5163                                 }
5164                                 return (op_err);
5165                                 break;
5166                         }
5167                 default:
5168                         /*
5169                          * we do not recognize the parameter figure out what
5170                          * we do.
5171                          */
5172                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5173                         if ((ptype & 0x4000) == 0x4000) {
5174                                 /* Report bit is set?? */
5175                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5176                                 if (op_err == NULL) {
5177                                         int l_len;
5178
5179                                         /* Ok need to try to get an mbuf */
5180 #ifdef INET6
5181                                         l_len = SCTP_MIN_OVERHEAD;
5182 #else
5183                                         l_len = SCTP_MIN_V4_OVERHEAD;
5184 #endif
5185                                         l_len += sizeof(struct sctp_chunkhdr);
5186                                         l_len += plen;
5187                                         l_len += sizeof(struct sctp_paramhdr);
5188                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5189                                         if (op_err) {
5190                                                 SCTP_BUF_LEN(op_err) = 0;
5191 #ifdef INET6
5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5193 #else
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5195 #endif
5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5197                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5198                                         }
5199                                 }
5200                                 if (op_err) {
5201                                         /* If we have space */
5202                                         struct sctp_paramhdr s;
5203
5204                                         if (err_at % 4) {
5205                                                 uint32_t cpthis = 0;
5206
5207                                                 pad_needed = 4 - (err_at % 4);
5208                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5209                                                 err_at += pad_needed;
5210                                         }
5211                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5212                                         s.param_length = htons(sizeof(s) + plen);
5213                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5214                                         err_at += sizeof(s);
5215                                         if (plen > sizeof(tempbuf)) {
5216                                                 plen = sizeof(tempbuf);
5217                                         }
5218                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5219                                         if (phdr == NULL) {
5220                                                 sctp_m_freem(op_err);
5221                                                 /*
5222                                                  * we are out of memory but
5223                                                  * we still need to have a
5224                                                  * look at what to do (the
5225                                                  * system is in trouble
5226                                                  * though).
5227                                                  */
5228                                                 op_err = NULL;
5229                                                 goto more_processing;
5230                                         }
5231                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5232                                         err_at += plen;
5233                                 }
5234                         }
5235         more_processing:
5236                         if ((ptype & 0x8000) == 0x0000) {
5237                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5238                                 return (op_err);
5239                         } else {
5240                                 /* skip this chunk and continue processing */
5241                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5242                                 at += SCTP_SIZE32(plen);
5243                         }
5244                         break;
5245
5246                 }
5247                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5248         }
5249         return (op_err);
5250 invalid_size:
5251         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5252         *abort_processing = 1;
5253         if ((op_err == NULL) && phdr) {
5254                 int l_len;
5255 #ifdef INET6
5256                 l_len = SCTP_MIN_OVERHEAD;
5257 #else
5258                 l_len = SCTP_MIN_V4_OVERHEAD;
5259 #endif
5260                 l_len += sizeof(struct sctp_chunkhdr);
5261                 l_len += (2 * sizeof(struct sctp_paramhdr));
5262                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5263                 if (op_err) {
5264                         SCTP_BUF_LEN(op_err) = 0;
5265 #ifdef INET6
5266                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5267 #else
5268                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5269 #endif
5270                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5271                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5272                 }
5273         }
5274         if ((op_err) && phdr) {
5275                 struct sctp_paramhdr s;
5276
5277                 if (err_at % 4) {
5278                         uint32_t cpthis = 0;
5279
5280                         pad_needed = 4 - (err_at % 4);
5281                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5282                         err_at += pad_needed;
5283                 }
5284                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5285                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5286                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5287                 err_at += sizeof(s);
5288                 /* Only copy back the p-hdr that caused the issue */
5289                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5290         }
5291         return (op_err);
5292 }
5293
5294 static int
5295 sctp_are_there_new_addresses(struct sctp_association *asoc,
5296     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5297 {
5298         /*
5299          * Given a INIT packet, look through the packet to verify that there
5300          * are NO new addresses. As we go through the parameters add reports
5301          * of any un-understood parameters that require an error.  Also we
5302          * must return (1) to drop the packet if we see a un-understood
5303          * parameter that tells us to drop the chunk.
5304          */
5305         struct sockaddr *sa_touse;
5306         struct sockaddr *sa;
5307         struct sctp_paramhdr *phdr, params;
5308         uint16_t ptype, plen;
5309         uint8_t fnd;
5310         struct sctp_nets *net;
5311         int check_src;
5312 #ifdef INET
5313         struct sockaddr_in sin4, *sa4;
5314 #endif
5315 #ifdef INET6
5316         struct sockaddr_in6 sin6, *sa6;
5317 #endif
5318
5319 #ifdef INET
5320         memset(&sin4, 0, sizeof(sin4));
5321         sin4.sin_family = AF_INET;
5322         sin4.sin_len = sizeof(sin4);
5323 #endif
5324 #ifdef INET6
5325         memset(&sin6, 0, sizeof(sin6));
5326         sin6.sin6_family = AF_INET6;
5327         sin6.sin6_len = sizeof(sin6);
5328 #endif
5329         /* First what about the src address of the pkt ? */
5330         check_src = 0;
5331         switch (src->sa_family) {
5332 #ifdef INET
5333         case AF_INET:
5334                 if (asoc->scope.ipv4_addr_legal) {
5335                         check_src = 1;
5336                 }
5337                 break;
5338 #endif
5339 #ifdef INET6
5340         case AF_INET6:
5341                 if (asoc->scope.ipv6_addr_legal) {
5342                         check_src = 1;
5343                 }
5344                 break;
5345 #endif
5346         default:
5347                 /* TSNH */
5348                 break;
5349         }
5350         if (check_src) {
5351                 fnd = 0;
5352                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5353                         sa = (struct sockaddr *)&net->ro._l_addr;
5354                         if (sa->sa_family == src->sa_family) {
5355 #ifdef INET
5356                                 if (sa->sa_family == AF_INET) {
5357                                         struct sockaddr_in *src4;
5358
5359                                         sa4 = (struct sockaddr_in *)sa;
5360                                         src4 = (struct sockaddr_in *)src;
5361                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5362                                                 fnd = 1;
5363                                                 break;
5364                                         }
5365                                 }
5366 #endif
5367 #ifdef INET6
5368                                 if (sa->sa_family == AF_INET6) {
5369                                         struct sockaddr_in6 *src6;
5370
5371                                         sa6 = (struct sockaddr_in6 *)sa;
5372                                         src6 = (struct sockaddr_in6 *)src;
5373                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5374                                                 fnd = 1;
5375                                                 break;
5376                                         }
5377                                 }
5378 #endif
5379                         }
5380                 }
5381                 if (fnd == 0) {
5382                         /* New address added! no need to look further. */
5383                         return (1);
5384                 }
5385         }
5386         /* Ok so far lets munge through the rest of the packet */
5387         offset += sizeof(struct sctp_init_chunk);
5388         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5389         while (phdr) {
5390                 sa_touse = NULL;
5391                 ptype = ntohs(phdr->param_type);
5392                 plen = ntohs(phdr->param_length);
5393                 switch (ptype) {
5394 #ifdef INET
5395                 case SCTP_IPV4_ADDRESS:
5396                         {
5397                                 struct sctp_ipv4addr_param *p4, p4_buf;
5398
5399                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5400                                         return (1);
5401                                 }
5402                                 phdr = sctp_get_next_param(in_initpkt, offset,
5403                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5404                                 if (phdr == NULL) {
5405                                         return (1);
5406                                 }
5407                                 if (asoc->scope.ipv4_addr_legal) {
5408                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5409                                         sin4.sin_addr.s_addr = p4->addr;
5410                                         sa_touse = (struct sockaddr *)&sin4;
5411                                 }
5412                                 break;
5413                         }
5414 #endif
5415 #ifdef INET6
5416                 case SCTP_IPV6_ADDRESS:
5417                         {
5418                                 struct sctp_ipv6addr_param *p6, p6_buf;
5419
5420                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5421                                         return (1);
5422                                 }
5423                                 phdr = sctp_get_next_param(in_initpkt, offset,
5424                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5425                                 if (phdr == NULL) {
5426                                         return (1);
5427                                 }
5428                                 if (asoc->scope.ipv6_addr_legal) {
5429                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5430                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5431                                             sizeof(p6->addr));
5432                                         sa_touse = (struct sockaddr *)&sin6;
5433                                 }
5434                                 break;
5435                         }
5436 #endif
5437                 default:
5438                         sa_touse = NULL;
5439                         break;
5440                 }
5441                 if (sa_touse) {
5442                         /* ok, sa_touse points to one to check */
5443                         fnd = 0;
5444                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5445                                 sa = (struct sockaddr *)&net->ro._l_addr;
5446                                 if (sa->sa_family != sa_touse->sa_family) {
5447                                         continue;
5448                                 }
5449 #ifdef INET
5450                                 if (sa->sa_family == AF_INET) {
5451                                         sa4 = (struct sockaddr_in *)sa;
5452                                         if (sa4->sin_addr.s_addr ==
5453                                             sin4.sin_addr.s_addr) {
5454                                                 fnd = 1;
5455                                                 break;
5456                                         }
5457                                 }
5458 #endif
5459 #ifdef INET6
5460                                 if (sa->sa_family == AF_INET6) {
5461                                         sa6 = (struct sockaddr_in6 *)sa;
5462                                         if (SCTP6_ARE_ADDR_EQUAL(
5463                                             sa6, &sin6)) {
5464                                                 fnd = 1;
5465                                                 break;
5466                                         }
5467                                 }
5468 #endif
5469                         }
5470                         if (!fnd) {
5471                                 /* New addr added! no need to look further */
5472                                 return (1);
5473                         }
5474                 }
5475                 offset += SCTP_SIZE32(plen);
5476                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5477         }
5478         return (0);
5479 }
5480
5481 /*
5482  * Given a MBUF chain that was sent into us containing an INIT. Build a
5483  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5484  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5485  * message (i.e. the struct sctp_init_msg).
5486  */
5487 void
5488 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5489     struct sctp_nets *src_net, struct mbuf *init_pkt,
5490     int iphlen, int offset,
5491     struct sockaddr *src, struct sockaddr *dst,
5492     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5493     uint8_t mflowtype, uint32_t mflowid,
5494     uint32_t vrf_id, uint16_t port)
5495 {
5496         struct sctp_association *asoc;
5497         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5498         struct sctp_init_ack_chunk *initack;
5499         struct sctp_adaptation_layer_indication *ali;
5500         struct sctp_supported_chunk_types_param *pr_supported;
5501         struct sctp_paramhdr *ph;
5502         union sctp_sockstore *over_addr;
5503         struct sctp_scoping scp;
5504 #ifdef INET
5505         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5506         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5507         struct sockaddr_in *sin;
5508 #endif
5509 #ifdef INET6
5510         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5511         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5512         struct sockaddr_in6 *sin6;
5513 #endif
5514         struct sockaddr *to;
5515         struct sctp_state_cookie stc;
5516         struct sctp_nets *net = NULL;
5517         uint8_t *signature = NULL;
5518         int cnt_inits_to = 0;
5519         uint16_t his_limit, i_want;
5520         int abort_flag;
5521         int nat_friendly = 0;
5522         int error;
5523         struct socket *so;
5524         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5525
5526         if (stcb) {
5527                 asoc = &stcb->asoc;
5528         } else {
5529                 asoc = NULL;
5530         }
5531         if ((asoc != NULL) &&
5532             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5533                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5534                         /*
5535                          * new addresses, out of here in non-cookie-wait
5536                          * states
5537                          *
5538                          * Send an ABORT, without the new address error
5539                          * cause. This looks no different than if no
5540                          * listener was present.
5541                          */
5542                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5543                             "Address added");
5544                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5545                             mflowtype, mflowid, inp->fibnum,
5546                             vrf_id, port);
5547                         return;
5548                 }
5549                 if (src_net != NULL && (src_net->port != port)) {
5550                         /*
5551                          * change of remote encapsulation port, out of here
5552                          * in non-cookie-wait states
5553                          *
5554                          * Send an ABORT, without an specific error cause.
5555                          * This looks no different than if no listener was
5556                          * present.
5557                          */
5558                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5559                             "Remote encapsulation port changed");
5560                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5561                             mflowtype, mflowid, inp->fibnum,
5562                             vrf_id, port);
5563                         return;
5564                 }
5565         }
5566         abort_flag = 0;
5567         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5568             (offset + sizeof(struct sctp_init_chunk)),
5569             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5570         if (abort_flag) {
5571 do_a_abort:
5572                 if (op_err == NULL) {
5573                         char msg[SCTP_DIAG_INFO_LEN];
5574
5575                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5576                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5577                             msg);
5578                 }
5579                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5580                     init_chk->init.initiate_tag, op_err,
5581                     mflowtype, mflowid, inp->fibnum,
5582                     vrf_id, port);
5583                 return;
5584         }
5585         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5586         if (m == NULL) {
5587                 /* No memory, INIT timer will re-attempt. */
5588                 if (op_err)
5589                         sctp_m_freem(op_err);
5590                 return;
5591         }
5592         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5593         padding_len = 0;
5594
5595         /*
5596          * We might not overwrite the identification[] completely and on
5597          * some platforms time_entered will contain some padding. Therefore
5598          * zero out the cookie to avoid putting uninitialized memory on the
5599          * wire.
5600          */
5601         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5602
5603         /* the time I built cookie */
5604         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5605
5606         /* populate any tie tags */
5607         if (asoc != NULL) {
5608                 /* unlock before tag selections */
5609                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5610                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5611                 stc.cookie_life = asoc->cookie_life;
5612                 net = asoc->primary_destination;
5613         } else {
5614                 stc.tie_tag_my_vtag = 0;
5615                 stc.tie_tag_peer_vtag = 0;
5616                 /* life I will award this cookie */
5617                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5618         }
5619
5620         /* copy in the ports for later check */
5621         stc.myport = sh->dest_port;
5622         stc.peerport = sh->src_port;
5623
5624         /*
5625          * If we wanted to honor cookie life extensions, we would add to
5626          * stc.cookie_life. For now we should NOT honor any extension
5627          */
5628         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5629         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5630                 stc.ipv6_addr_legal = 1;
5631                 if (SCTP_IPV6_V6ONLY(inp)) {
5632                         stc.ipv4_addr_legal = 0;
5633                 } else {
5634                         stc.ipv4_addr_legal = 1;
5635                 }
5636         } else {
5637                 stc.ipv6_addr_legal = 0;
5638                 stc.ipv4_addr_legal = 1;
5639         }
5640         stc.ipv4_scope = 0;
5641         if (net == NULL) {
5642                 to = src;
5643                 switch (dst->sa_family) {
5644 #ifdef INET
5645                 case AF_INET:
5646                         {
5647                                 /* lookup address */
5648                                 stc.address[0] = src4->sin_addr.s_addr;
5649                                 stc.address[1] = 0;
5650                                 stc.address[2] = 0;
5651                                 stc.address[3] = 0;
5652                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5653                                 /* local from address */
5654                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5655                                 stc.laddress[1] = 0;
5656                                 stc.laddress[2] = 0;
5657                                 stc.laddress[3] = 0;
5658                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5659                                 /* scope_id is only for v6 */
5660                                 stc.scope_id = 0;
5661                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5662                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5663                                         stc.ipv4_scope = 1;
5664                                 }
5665                                 /* Must use the address in this case */
5666                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5667                                         stc.loopback_scope = 1;
5668                                         stc.ipv4_scope = 1;
5669                                         stc.site_scope = 1;
5670                                         stc.local_scope = 0;
5671                                 }
5672                                 break;
5673                         }
5674 #endif
5675 #ifdef INET6
5676                 case AF_INET6:
5677                         {
5678                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5679                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5680                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5681                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5682                                         stc.loopback_scope = 1;
5683                                         stc.local_scope = 0;
5684                                         stc.site_scope = 1;
5685                                         stc.ipv4_scope = 1;
5686                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5687                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5688                                         /*
5689                                          * If the new destination or source
5690                                          * is a LINK_LOCAL we must have
5691                                          * common both site and local scope.
5692                                          * Don't set local scope though
5693                                          * since we must depend on the
5694                                          * source to be added implicitly. We
5695                                          * cannot assure just because we
5696                                          * share one link that all links are
5697                                          * common.
5698                                          */
5699                                         stc.local_scope = 0;
5700                                         stc.site_scope = 1;
5701                                         stc.ipv4_scope = 1;
5702                                         /*
5703                                          * we start counting for the private
5704                                          * address stuff at 1. since the
5705                                          * link local we source from won't
5706                                          * show up in our scoped count.
5707                                          */
5708                                         cnt_inits_to = 1;
5709                                         /*
5710                                          * pull out the scope_id from
5711                                          * incoming pkt
5712                                          */
5713                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5714                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5715                                         /*
5716                                          * If the new destination or source
5717                                          * is SITE_LOCAL then we must have
5718                                          * site scope in common.
5719                                          */
5720                                         stc.site_scope = 1;
5721                                 }
5722                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5723                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5724                                 break;
5725                         }
5726 #endif
5727                 default:
5728                         /* TSNH */
5729                         goto do_a_abort;
5730                         break;
5731                 }
5732         } else {
5733                 /* set the scope per the existing tcb */
5734
5735 #ifdef INET6
5736                 struct sctp_nets *lnet;
5737 #endif
5738
5739                 stc.loopback_scope = asoc->scope.loopback_scope;
5740                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5741                 stc.site_scope = asoc->scope.site_scope;
5742                 stc.local_scope = asoc->scope.local_scope;
5743 #ifdef INET6
5744                 /* Why do we not consider IPv4 LL addresses? */
5745                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5746                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5747                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5748                                         /*
5749                                          * if we have a LL address, start
5750                                          * counting at 1.
5751                                          */
5752                                         cnt_inits_to = 1;
5753                                 }
5754                         }
5755                 }
5756 #endif
5757                 /* use the net pointer */
5758                 to = (struct sockaddr *)&net->ro._l_addr;
5759                 switch (to->sa_family) {
5760 #ifdef INET
5761                 case AF_INET:
5762                         sin = (struct sockaddr_in *)to;
5763                         stc.address[0] = sin->sin_addr.s_addr;
5764                         stc.address[1] = 0;
5765                         stc.address[2] = 0;
5766                         stc.address[3] = 0;
5767                         stc.addr_type = SCTP_IPV4_ADDRESS;
5768                         if (net->src_addr_selected == 0) {
5769                                 /*
5770                                  * strange case here, the INIT should have
5771                                  * did the selection.
5772                                  */
5773                                 net->ro._s_addr = sctp_source_address_selection(inp,
5774                                     stcb, (sctp_route_t *)&net->ro,
5775                                     net, 0, vrf_id);
5776                                 if (net->ro._s_addr == NULL)
5777                                         return;
5778
5779                                 net->src_addr_selected = 1;
5780
5781                         }
5782                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5783                         stc.laddress[1] = 0;
5784                         stc.laddress[2] = 0;
5785                         stc.laddress[3] = 0;
5786                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5787                         /* scope_id is only for v6 */
5788                         stc.scope_id = 0;
5789                         break;
5790 #endif
5791 #ifdef INET6
5792                 case AF_INET6:
5793                         sin6 = (struct sockaddr_in6 *)to;
5794                         memcpy(&stc.address, &sin6->sin6_addr,
5795                             sizeof(struct in6_addr));
5796                         stc.addr_type = SCTP_IPV6_ADDRESS;
5797                         stc.scope_id = sin6->sin6_scope_id;
5798                         if (net->src_addr_selected == 0) {
5799                                 /*
5800                                  * strange case here, the INIT should have
5801                                  * done the selection.
5802                                  */
5803                                 net->ro._s_addr = sctp_source_address_selection(inp,
5804                                     stcb, (sctp_route_t *)&net->ro,
5805                                     net, 0, vrf_id);
5806                                 if (net->ro._s_addr == NULL)
5807                                         return;
5808
5809                                 net->src_addr_selected = 1;
5810                         }
5811                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5812                             sizeof(struct in6_addr));
5813                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5814                         break;
5815 #endif
5816                 }
5817         }
5818         /* Now lets put the SCTP header in place */
5819         initack = mtod(m, struct sctp_init_ack_chunk *);
5820         /* Save it off for quick ref */
5821         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5822         /* who are we */
5823         memcpy(stc.identification, SCTP_VERSION_STRING,
5824             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5825         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5826         /* now the chunk header */
5827         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5828         initack->ch.chunk_flags = 0;
5829         /* fill in later from mbuf we build */
5830         initack->ch.chunk_length = 0;
5831         /* place in my tag */
5832         if ((asoc != NULL) &&
5833             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5834             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5835             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5836                 /* re-use the v-tags and init-seq here */
5837                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5838                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5839         } else {
5840                 uint32_t vtag, itsn;
5841
5842                 if (asoc) {
5843                         atomic_add_int(&asoc->refcnt, 1);
5844                         SCTP_TCB_UNLOCK(stcb);
5845         new_tag:
5846                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5847                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5848                                 /*
5849                                  * Got a duplicate vtag on some guy behind a
5850                                  * nat make sure we don't use it.
5851                                  */
5852                                 goto new_tag;
5853                         }
5854                         initack->init.initiate_tag = htonl(vtag);
5855                         /* get a TSN to use too */
5856                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5857                         initack->init.initial_tsn = htonl(itsn);
5858                         SCTP_TCB_LOCK(stcb);
5859                         atomic_add_int(&asoc->refcnt, -1);
5860                 } else {
5861                         SCTP_INP_INCR_REF(inp);
5862                         SCTP_INP_RUNLOCK(inp);
5863                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5864                         initack->init.initiate_tag = htonl(vtag);
5865                         /* get a TSN to use too */
5866                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5867                         SCTP_INP_RLOCK(inp);
5868                         SCTP_INP_DECR_REF(inp);
5869                 }
5870         }
5871         /* save away my tag to */
5872         stc.my_vtag = initack->init.initiate_tag;
5873
5874         /* set up some of the credits. */
5875         so = inp->sctp_socket;
5876         if (so == NULL) {
5877                 /* memory problem */
5878                 sctp_m_freem(m);
5879                 return;
5880         } else {
5881                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5882         }
5883         /* set what I want */
5884         his_limit = ntohs(init_chk->init.num_inbound_streams);
5885         /* choose what I want */
5886         if (asoc != NULL) {
5887                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5888                         i_want = asoc->streamoutcnt;
5889                 } else {
5890                         i_want = asoc->pre_open_streams;
5891                 }
5892         } else {
5893                 i_want = inp->sctp_ep.pre_open_stream_count;
5894         }
5895         if (his_limit < i_want) {
5896                 /* I Want more :< */
5897                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5898         } else {
5899                 /* I can have what I want :> */
5900                 initack->init.num_outbound_streams = htons(i_want);
5901         }
5902         /* tell him his limit. */
5903         initack->init.num_inbound_streams =
5904             htons(inp->sctp_ep.max_open_streams_intome);
5905
5906         /* adaptation layer indication parameter */
5907         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5908                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5909                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5910                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5911                 ali->ph.param_length = htons(parameter_len);
5912                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5913                 chunk_len += parameter_len;
5914         }
5915         /* ECN parameter */
5916         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5917             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5918                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5919                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5920                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5921                 ph->param_length = htons(parameter_len);
5922                 chunk_len += parameter_len;
5923         }
5924         /* PR-SCTP supported parameter */
5925         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5926             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5927                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5928                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5929                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5930                 ph->param_length = htons(parameter_len);
5931                 chunk_len += parameter_len;
5932         }
5933         /* Add NAT friendly parameter */
5934         if (nat_friendly) {
5935                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5936                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5937                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5938                 ph->param_length = htons(parameter_len);
5939                 chunk_len += parameter_len;
5940         }
5941         /* And now tell the peer which extensions we support */
5942         num_ext = 0;
5943         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5944         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5945             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5946                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5947                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5948                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5949                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5950                 }
5951         }
5952         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5953             ((asoc == NULL) && (inp->auth_supported == 1))) {
5954                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5955         }
5956         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5957             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5958                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5959                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5960         }
5961         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5962             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5963                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5964         }
5965         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5966             ((asoc == NULL) && (inp->idata_supported == 1))) {
5967                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5968         }
5969         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5970             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5971                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5972         }
5973         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5974             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5975                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5976         }
5977         if (num_ext > 0) {
5978                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5979                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5980                 pr_supported->ph.param_length = htons(parameter_len);
5981                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5982                 chunk_len += parameter_len;
5983         }
5984         /* add authentication parameters */
5985         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5986             ((asoc == NULL) && (inp->auth_supported == 1))) {
5987                 struct sctp_auth_random *randp;
5988                 struct sctp_auth_hmac_algo *hmacs;
5989                 struct sctp_auth_chunk_list *chunks;
5990
5991                 if (padding_len > 0) {
5992                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5993                         chunk_len += padding_len;
5994                         padding_len = 0;
5995                 }
5996                 /* generate and add RANDOM parameter */
5997                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5998                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5999                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6000                 randp->ph.param_type = htons(SCTP_RANDOM);
6001                 randp->ph.param_length = htons(parameter_len);
6002                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6003                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6004                 chunk_len += parameter_len;
6005
6006                 if (padding_len > 0) {
6007                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6008                         chunk_len += padding_len;
6009                         padding_len = 0;
6010                 }
6011                 /* add HMAC_ALGO parameter */
6012                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6013                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6014                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6015                     (uint8_t *)hmacs->hmac_ids);
6016                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6017                 hmacs->ph.param_length = htons(parameter_len);
6018                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6019                 chunk_len += parameter_len;
6020
6021                 if (padding_len > 0) {
6022                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6023                         chunk_len += padding_len;
6024                         padding_len = 0;
6025                 }
6026                 /* add CHUNKS parameter */
6027                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6028                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6029                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6030                     chunks->chunk_types);
6031                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6032                 chunks->ph.param_length = htons(parameter_len);
6033                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6034                 chunk_len += parameter_len;
6035         }
6036         SCTP_BUF_LEN(m) = chunk_len;
6037         m_last = m;
6038         /* now the addresses */
6039         /*
6040          * To optimize this we could put the scoping stuff into a structure
6041          * and remove the individual uint8's from the stc structure. Then we
6042          * could just sifa in the address within the stc.. but for now this
6043          * is a quick hack to get the address stuff teased apart.
6044          */
6045         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6046         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6047         scp.loopback_scope = stc.loopback_scope;
6048         scp.ipv4_local_scope = stc.ipv4_scope;
6049         scp.local_scope = stc.local_scope;
6050         scp.site_scope = stc.site_scope;
6051         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6052             cnt_inits_to,
6053             &padding_len, &chunk_len);
6054         /* padding_len can only be positive, if no addresses have been added */
6055         if (padding_len > 0) {
6056                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6057                 chunk_len += padding_len;
6058                 SCTP_BUF_LEN(m) += padding_len;
6059                 padding_len = 0;
6060         }
6061         /* tack on the operational error if present */
6062         if (op_err) {
6063                 parameter_len = 0;
6064                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6065                         parameter_len += SCTP_BUF_LEN(m_tmp);
6066                 }
6067                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6068                 SCTP_BUF_NEXT(m_last) = op_err;
6069                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6070                         m_last = SCTP_BUF_NEXT(m_last);
6071                 }
6072                 chunk_len += parameter_len;
6073         }
6074         if (padding_len > 0) {
6075                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6076                 if (m_last == NULL) {
6077                         /* Houston we have a problem, no space */
6078                         sctp_m_freem(m);
6079                         return;
6080                 }
6081                 chunk_len += padding_len;
6082                 padding_len = 0;
6083         }
6084         /* Now we must build a cookie */
6085         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6086         if (m_cookie == NULL) {
6087                 /* memory problem */
6088                 sctp_m_freem(m);
6089                 return;
6090         }
6091         /* Now append the cookie to the end and update the space/size */
6092         SCTP_BUF_NEXT(m_last) = m_cookie;
6093         parameter_len = 0;
6094         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6095                 parameter_len += SCTP_BUF_LEN(m_tmp);
6096                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6097                         m_last = m_tmp;
6098                 }
6099         }
6100         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6101         chunk_len += parameter_len;
6102
6103         /*
6104          * Place in the size, but we don't include the last pad (if any) in
6105          * the INIT-ACK.
6106          */
6107         initack->ch.chunk_length = htons(chunk_len);
6108
6109         /*
6110          * Time to sign the cookie, we don't sign over the cookie signature
6111          * though thus we set trailer.
6112          */
6113         (void)sctp_hmac_m(SCTP_HMAC,
6114             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6115             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6116             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6117         /*
6118          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6119          * here since the timer will drive a retranmission.
6120          */
6121         if (padding_len > 0) {
6122                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6123                         sctp_m_freem(m);
6124                         return;
6125                 }
6126         }
6127         if (stc.loopback_scope) {
6128                 over_addr = (union sctp_sockstore *)dst;
6129         } else {
6130                 over_addr = NULL;
6131         }
6132
6133         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6134             0, 0,
6135             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6136             port, over_addr,
6137             mflowtype, mflowid,
6138             SCTP_SO_NOT_LOCKED))) {
6139                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6140                 if (error == ENOBUFS) {
6141                         if (asoc != NULL) {
6142                                 asoc->ifp_had_enobuf = 1;
6143                         }
6144                         SCTP_STAT_INCR(sctps_lowlevelerr);
6145                 }
6146         } else {
6147                 if (asoc != NULL) {
6148                         asoc->ifp_had_enobuf = 0;
6149                 }
6150         }
6151         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6152 }
6153
6154
6155 static void
6156 sctp_prune_prsctp(struct sctp_tcb *stcb,
6157     struct sctp_association *asoc,
6158     struct sctp_sndrcvinfo *srcv,
6159     int dataout)
6160 {
6161         int freed_spc = 0;
6162         struct sctp_tmit_chunk *chk, *nchk;
6163
6164         SCTP_TCB_LOCK_ASSERT(stcb);
6165         if ((asoc->prsctp_supported) &&
6166             (asoc->sent_queue_cnt_removeable > 0)) {
6167                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6168                         /*
6169                          * Look for chunks marked with the PR_SCTP flag AND
6170                          * the buffer space flag. If the one being sent is
6171                          * equal or greater priority then purge the old one
6172                          * and free some space.
6173                          */
6174                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6175                                 /*
6176                                  * This one is PR-SCTP AND buffer space
6177                                  * limited type
6178                                  */
6179                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6180                                         /*
6181                                          * Lower numbers equates to higher
6182                                          * priority so if the one we are
6183                                          * looking at has a larger or equal
6184                                          * priority we want to drop the data
6185                                          * and NOT retransmit it.
6186                                          */
6187                                         if (chk->data) {
6188                                                 /*
6189                                                  * We release the book_size
6190                                                  * if the mbuf is here
6191                                                  */
6192                                                 int ret_spc;
6193                                                 uint8_t sent;
6194
6195                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6196                                                         sent = 1;
6197                                                 else
6198                                                         sent = 0;
6199                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6200                                                     sent,
6201                                                     SCTP_SO_LOCKED);
6202                                                 freed_spc += ret_spc;
6203                                                 if (freed_spc >= dataout) {
6204                                                         return;
6205                                                 }
6206                                         }       /* if chunk was present */
6207                                 }       /* if of sufficient priority */
6208                         }       /* if chunk has enabled */
6209                 }               /* tailqforeach */
6210
6211                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6212                         /* Here we must move to the sent queue and mark */
6213                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6214                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6215                                         if (chk->data) {
6216                                                 /*
6217                                                  * We release the book_size
6218                                                  * if the mbuf is here
6219                                                  */
6220                                                 int ret_spc;
6221
6222                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6223                                                     0, SCTP_SO_LOCKED);
6224
6225                                                 freed_spc += ret_spc;
6226                                                 if (freed_spc >= dataout) {
6227                                                         return;
6228                                                 }
6229                                         }       /* end if chk->data */
6230                                 }       /* end if right class */
6231                         }       /* end if chk pr-sctp */
6232                 }               /* tailqforeachsafe (chk) */
6233         }                       /* if enabled in asoc */
6234 }
6235
6236 int
6237 sctp_get_frag_point(struct sctp_tcb *stcb,
6238     struct sctp_association *asoc)
6239 {
6240         int siz, ovh;
6241
6242         /*
6243          * For endpoints that have both v6 and v4 addresses we must reserve
6244          * room for the ipv6 header, for those that are only dealing with V4
6245          * we use a larger frag point.
6246          */
6247         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6248                 ovh = SCTP_MIN_OVERHEAD;
6249         } else {
6250                 ovh = SCTP_MIN_V4_OVERHEAD;
6251         }
6252         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6253         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6254                 siz = asoc->smallest_mtu - ovh;
6255         else
6256                 siz = (stcb->asoc.sctp_frag_point - ovh);
6257         /*
6258          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6259          */
6260         /* A data chunk MUST fit in a cluster */
6261         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6262         /* } */
6263
6264         /* adjust for an AUTH chunk if DATA requires auth */
6265         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6266                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6267
6268         if (siz % 4) {
6269                 /* make it an even word boundary please */
6270                 siz -= (siz % 4);
6271         }
6272         return (siz);
6273 }
6274
6275 static void
6276 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6277 {
6278         /*
6279          * We assume that the user wants PR_SCTP_TTL if the user provides a
6280          * positive lifetime but does not specify any PR_SCTP policy.
6281          */
6282         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6283                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6284         } else if (sp->timetolive > 0) {
6285                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6286                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6287         } else {
6288                 return;
6289         }
6290         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6291         case CHUNK_FLAGS_PR_SCTP_BUF:
6292                 /*
6293                  * Time to live is a priority stored in tv_sec when doing
6294                  * the buffer drop thing.
6295                  */
6296                 sp->ts.tv_sec = sp->timetolive;
6297                 sp->ts.tv_usec = 0;
6298                 break;
6299         case CHUNK_FLAGS_PR_SCTP_TTL:
6300                 {
6301                         struct timeval tv;
6302
6303                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6304                         tv.tv_sec = sp->timetolive / 1000;
6305                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6306                         /*
6307                          * TODO sctp_constants.h needs alternative time
6308                          * macros when _KERNEL is undefined.
6309                          */
6310                         timevaladd(&sp->ts, &tv);
6311                 }
6312                 break;
6313         case CHUNK_FLAGS_PR_SCTP_RTX:
6314                 /*
6315                  * Time to live is a the number or retransmissions stored in
6316                  * tv_sec.
6317                  */
6318                 sp->ts.tv_sec = sp->timetolive;
6319                 sp->ts.tv_usec = 0;
6320                 break;
6321         default:
6322                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6323                     "Unknown PR_SCTP policy %u.\n",
6324                     PR_SCTP_POLICY(sp->sinfo_flags));
6325                 break;
6326         }
6327 }
6328
6329 static int
6330 sctp_msg_append(struct sctp_tcb *stcb,
6331     struct sctp_nets *net,
6332     struct mbuf *m,
6333     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6334 {
6335         int error = 0;
6336         struct mbuf *at;
6337         struct sctp_stream_queue_pending *sp = NULL;
6338         struct sctp_stream_out *strm;
6339
6340         /*
6341          * Given an mbuf chain, put it into the association send queue and
6342          * place it on the wheel
6343          */
6344         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6345                 /* Invalid stream number */
6346                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6347                 error = EINVAL;
6348                 goto out_now;
6349         }
6350         if ((stcb->asoc.stream_locked) &&
6351             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6352                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6353                 error = EINVAL;
6354                 goto out_now;
6355         }
6356         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6357         /* Now can we send this? */
6358         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6359             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6360             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6361             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6362                 /* got data while shutting down */
6363                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6364                 error = ECONNRESET;
6365                 goto out_now;
6366         }
6367         sctp_alloc_a_strmoq(stcb, sp);
6368         if (sp == NULL) {
6369                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6370                 error = ENOMEM;
6371                 goto out_now;
6372         }
6373         sp->sinfo_flags = srcv->sinfo_flags;
6374         sp->timetolive = srcv->sinfo_timetolive;
6375         sp->ppid = srcv->sinfo_ppid;
6376         sp->context = srcv->sinfo_context;
6377         sp->fsn = 0;
6378         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6379                 sp->net = net;
6380                 atomic_add_int(&sp->net->ref_count, 1);
6381         } else {
6382                 sp->net = NULL;
6383         }
6384         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6385         sp->sid = srcv->sinfo_stream;
6386         sp->msg_is_complete = 1;
6387         sp->sender_all_done = 1;
6388         sp->some_taken = 0;
6389         sp->data = m;
6390         sp->tail_mbuf = NULL;
6391         sctp_set_prsctp_policy(sp);
6392         /*
6393          * We could in theory (for sendall) sifa the length in, but we would
6394          * still have to hunt through the chain since we need to setup the
6395          * tail_mbuf
6396          */
6397         sp->length = 0;
6398         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6399                 if (SCTP_BUF_NEXT(at) == NULL)
6400                         sp->tail_mbuf = at;
6401                 sp->length += SCTP_BUF_LEN(at);
6402         }
6403         if (srcv->sinfo_keynumber_valid) {
6404                 sp->auth_keyid = srcv->sinfo_keynumber;
6405         } else {
6406                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6407         }
6408         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6409                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6410                 sp->holds_key_ref = 1;
6411         }
6412         if (hold_stcb_lock == 0) {
6413                 SCTP_TCB_SEND_LOCK(stcb);
6414         }
6415         sctp_snd_sb_alloc(stcb, sp->length);
6416         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6417         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6418         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6419         m = NULL;
6420         if (hold_stcb_lock == 0) {
6421                 SCTP_TCB_SEND_UNLOCK(stcb);
6422         }
6423 out_now:
6424         if (m) {
6425                 sctp_m_freem(m);
6426         }
6427         return (error);
6428 }
6429
6430
6431 static struct mbuf *
6432 sctp_copy_mbufchain(struct mbuf *clonechain,
6433     struct mbuf *outchain,
6434     struct mbuf **endofchain,
6435     int can_take_mbuf,
6436     int sizeofcpy,
6437     uint8_t copy_by_ref)
6438 {
6439         struct mbuf *m;
6440         struct mbuf *appendchain;
6441         caddr_t cp;
6442         int len;
6443
6444         if (endofchain == NULL) {
6445                 /* error */
6446 error_out:
6447                 if (outchain)
6448                         sctp_m_freem(outchain);
6449                 return (NULL);
6450         }
6451         if (can_take_mbuf) {
6452                 appendchain = clonechain;
6453         } else {
6454                 if (!copy_by_ref &&
6455                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6456                     ) {
6457                         /* Its not in a cluster */
6458                         if (*endofchain == NULL) {
6459                                 /* lets get a mbuf cluster */
6460                                 if (outchain == NULL) {
6461                                         /* This is the general case */
6462                         new_mbuf:
6463                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6464                                         if (outchain == NULL) {
6465                                                 goto error_out;
6466                                         }
6467                                         SCTP_BUF_LEN(outchain) = 0;
6468                                         *endofchain = outchain;
6469                                         /* get the prepend space */
6470                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6471                                 } else {
6472                                         /*
6473                                          * We really should not get a NULL
6474                                          * in endofchain
6475                                          */
6476                                         /* find end */
6477                                         m = outchain;
6478                                         while (m) {
6479                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6480                                                         *endofchain = m;
6481                                                         break;
6482                                                 }
6483                                                 m = SCTP_BUF_NEXT(m);
6484                                         }
6485                                         /* sanity */
6486                                         if (*endofchain == NULL) {
6487                                                 /*
6488                                                  * huh, TSNH XXX maybe we
6489                                                  * should panic
6490                                                  */
6491                                                 sctp_m_freem(outchain);
6492                                                 goto new_mbuf;
6493                                         }
6494                                 }
6495                                 /* get the new end of length */
6496                                 len = (int)M_TRAILINGSPACE(*endofchain);
6497                         } else {
6498                                 /* how much is left at the end? */
6499                                 len = (int)M_TRAILINGSPACE(*endofchain);
6500                         }
6501                         /* Find the end of the data, for appending */
6502                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6503
6504                         /* Now lets copy it out */
6505                         if (len >= sizeofcpy) {
6506                                 /* It all fits, copy it in */
6507                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6508                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6509                         } else {
6510                                 /* fill up the end of the chain */
6511                                 if (len > 0) {
6512                                         m_copydata(clonechain, 0, len, cp);
6513                                         SCTP_BUF_LEN((*endofchain)) += len;
6514                                         /* now we need another one */
6515                                         sizeofcpy -= len;
6516                                 }
6517                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6518                                 if (m == NULL) {
6519                                         /* We failed */
6520                                         goto error_out;
6521                                 }
6522                                 SCTP_BUF_NEXT((*endofchain)) = m;
6523                                 *endofchain = m;
6524                                 cp = mtod((*endofchain), caddr_t);
6525                                 m_copydata(clonechain, len, sizeofcpy, cp);
6526                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6527                         }
6528                         return (outchain);
6529                 } else {
6530                         /* copy the old fashion way */
6531                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6532 #ifdef SCTP_MBUF_LOGGING
6533                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6534                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6535                         }
6536 #endif
6537                 }
6538         }
6539         if (appendchain == NULL) {
6540                 /* error */
6541                 if (outchain)
6542                         sctp_m_freem(outchain);
6543                 return (NULL);
6544         }
6545         if (outchain) {
6546                 /* tack on to the end */
6547                 if (*endofchain != NULL) {
6548                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6549                 } else {
6550                         m = outchain;
6551                         while (m) {
6552                                 if (SCTP_BUF_NEXT(m) == NULL) {
6553                                         SCTP_BUF_NEXT(m) = appendchain;
6554                                         break;
6555                                 }
6556                                 m = SCTP_BUF_NEXT(m);
6557                         }
6558                 }
6559                 /*
6560                  * save off the end and update the end-chain position
6561                  */
6562                 m = appendchain;
6563                 while (m) {
6564                         if (SCTP_BUF_NEXT(m) == NULL) {
6565                                 *endofchain = m;
6566                                 break;
6567                         }
6568                         m = SCTP_BUF_NEXT(m);
6569                 }
6570                 return (outchain);
6571         } else {
6572                 /* save off the end and update the end-chain position */
6573                 m = appendchain;
6574                 while (m) {
6575                         if (SCTP_BUF_NEXT(m) == NULL) {
6576                                 *endofchain = m;
6577                                 break;
6578                         }
6579                         m = SCTP_BUF_NEXT(m);
6580                 }
6581                 return (appendchain);
6582         }
6583 }
6584
6585 static int
6586 sctp_med_chunk_output(struct sctp_inpcb *inp,
6587     struct sctp_tcb *stcb,
6588     struct sctp_association *asoc,
6589     int *num_out,
6590     int *reason_code,
6591     int control_only, int from_where,
6592     struct timeval *now, int *now_filled, int frag_point, int so_locked
6593 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6594     SCTP_UNUSED
6595 #endif
6596 );
6597
6598 static void
6599 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6600     uint32_t val SCTP_UNUSED)
6601 {
6602         struct sctp_copy_all *ca;
6603         struct mbuf *m;
6604         int ret = 0;
6605         int added_control = 0;
6606         int un_sent, do_chunk_output = 1;
6607         struct sctp_association *asoc;
6608         struct sctp_nets *net;
6609
6610         ca = (struct sctp_copy_all *)ptr;
6611         if (ca->m == NULL) {
6612                 return;
6613         }
6614         if (ca->inp != inp) {
6615                 /* TSNH */
6616                 return;
6617         }
6618         if (ca->sndlen > 0) {
6619                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6620                 if (m == NULL) {
6621                         /* can't copy so we are done */
6622                         ca->cnt_failed++;
6623                         return;
6624                 }
6625 #ifdef SCTP_MBUF_LOGGING
6626                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6627                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6628                 }
6629 #endif
6630         } else {
6631                 m = NULL;
6632         }
6633         SCTP_TCB_LOCK_ASSERT(stcb);
6634         if (stcb->asoc.alternate) {
6635                 net = stcb->asoc.alternate;
6636         } else {
6637                 net = stcb->asoc.primary_destination;
6638         }
6639         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6640                 /* Abort this assoc with m as the user defined reason */
6641                 if (m != NULL) {
6642                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6643                 } else {
6644                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6645                             0, M_NOWAIT, 1, MT_DATA);
6646                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6647                 }
6648                 if (m != NULL) {
6649                         struct sctp_paramhdr *ph;
6650
6651                         ph = mtod(m, struct sctp_paramhdr *);
6652                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6653                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6654                 }
6655                 /*
6656                  * We add one here to keep the assoc from dis-appearing on
6657                  * us.
6658                  */
6659                 atomic_add_int(&stcb->asoc.refcnt, 1);
6660                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6661                 /*
6662                  * sctp_abort_an_association calls sctp_free_asoc() free
6663                  * association will NOT free it since we incremented the
6664                  * refcnt .. we do this to prevent it being freed and things
6665                  * getting tricky since we could end up (from free_asoc)
6666                  * calling inpcb_free which would get a recursive lock call
6667                  * to the iterator lock.. But as a consequence of that the
6668                  * stcb will return to us un-locked.. since free_asoc
6669                  * returns with either no TCB or the TCB unlocked, we must
6670                  * relock.. to unlock in the iterator timer :-0
6671                  */
6672                 SCTP_TCB_LOCK(stcb);
6673                 atomic_add_int(&stcb->asoc.refcnt, -1);
6674                 goto no_chunk_output;
6675         } else {
6676                 if (m) {
6677                         ret = sctp_msg_append(stcb, net, m,
6678                             &ca->sndrcv, 1);
6679                 }
6680                 asoc = &stcb->asoc;
6681                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6682                         /* shutdown this assoc */
6683                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6684                             TAILQ_EMPTY(&asoc->sent_queue) &&
6685                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6686                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6687                                         goto abort_anyway;
6688                                 }
6689                                 /*
6690                                  * there is nothing queued to send, so I'm
6691                                  * done...
6692                                  */
6693                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6694                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6695                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6696                                         /*
6697                                          * only send SHUTDOWN the first time
6698                                          * through
6699                                          */
6700                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6701                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6702                                         }
6703                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6704                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6705                                         sctp_stop_timers_for_shutdown(stcb);
6706                                         sctp_send_shutdown(stcb, net);
6707                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6708                                             net);
6709                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6710                                             asoc->primary_destination);
6711                                         added_control = 1;
6712                                         do_chunk_output = 0;
6713                                 }
6714                         } else {
6715                                 /*
6716                                  * we still got (or just got) data to send,
6717                                  * so set SHUTDOWN_PENDING
6718                                  */
6719                                 /*
6720                                  * XXX sockets draft says that SCTP_EOF
6721                                  * should be sent with no data.  currently,
6722                                  * we will allow user data to be sent first
6723                                  * and move to SHUTDOWN-PENDING
6724                                  */
6725                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6726                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6727                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6728                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6729                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6730                                         }
6731                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6732                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6733                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6734                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6735                                                 struct mbuf *op_err;
6736                                                 char msg[SCTP_DIAG_INFO_LEN];
6737
6738                                 abort_anyway:
6739                                                 snprintf(msg, sizeof(msg),
6740                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6741                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6742                                                     msg);
6743                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6744                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6745                                                     op_err, SCTP_SO_NOT_LOCKED);
6746                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6747                                                 goto no_chunk_output;
6748                                         }
6749                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6750                                             asoc->primary_destination);
6751                                 }
6752                         }
6753
6754                 }
6755         }
6756         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6757             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6758
6759         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6760             (stcb->asoc.total_flight > 0) &&
6761             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6762                 do_chunk_output = 0;
6763         }
6764         if (do_chunk_output)
6765                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6766         else if (added_control) {
6767                 int num_out, reason, now_filled = 0;
6768                 struct timeval now;
6769                 int frag_point;
6770
6771                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6772                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6773                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6774         }
6775 no_chunk_output:
6776         if (ret) {
6777                 ca->cnt_failed++;
6778         } else {
6779                 ca->cnt_sent++;
6780         }
6781 }
6782
6783 static void
6784 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6785 {
6786         struct sctp_copy_all *ca;
6787
6788         ca = (struct sctp_copy_all *)ptr;
6789         /*
6790          * Do a notify here? Kacheong suggests that the notify be done at
6791          * the send time.. so you would push up a notification if any send
6792          * failed. Don't know if this is feasible since the only failures we
6793          * have is "memory" related and if you cannot get an mbuf to send
6794          * the data you surely can't get an mbuf to send up to notify the
6795          * user you can't send the data :->
6796          */
6797
6798         /* now free everything */
6799         sctp_m_freem(ca->m);
6800         SCTP_FREE(ca, SCTP_M_COPYAL);
6801 }
6802
6803 static struct mbuf *
6804 sctp_copy_out_all(struct uio *uio, int len)
6805 {
6806         struct mbuf *ret, *at;
6807         int left, willcpy, cancpy, error;
6808
6809         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6810         if (ret == NULL) {
6811                 /* TSNH */
6812                 return (NULL);
6813         }
6814         left = len;
6815         SCTP_BUF_LEN(ret) = 0;
6816         /* save space for the data chunk header */
6817         cancpy = (int)M_TRAILINGSPACE(ret);
6818         willcpy = min(cancpy, left);
6819         at = ret;
6820         while (left > 0) {
6821                 /* Align data to the end */
6822                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6823                 if (error) {
6824         err_out_now:
6825                         sctp_m_freem(at);
6826                         return (NULL);
6827                 }
6828                 SCTP_BUF_LEN(at) = willcpy;
6829                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6830                 left -= willcpy;
6831                 if (left > 0) {
6832                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6833                         if (SCTP_BUF_NEXT(at) == NULL) {
6834                                 goto err_out_now;
6835                         }
6836                         at = SCTP_BUF_NEXT(at);
6837                         SCTP_BUF_LEN(at) = 0;
6838                         cancpy = (int)M_TRAILINGSPACE(at);
6839                         willcpy = min(cancpy, left);
6840                 }
6841         }
6842         return (ret);
6843 }
6844
6845 static int
6846 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6847     struct sctp_sndrcvinfo *srcv)
6848 {
6849         int ret;
6850         struct sctp_copy_all *ca;
6851
6852         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6853             SCTP_M_COPYAL);
6854         if (ca == NULL) {
6855                 sctp_m_freem(m);
6856                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6857                 return (ENOMEM);
6858         }
6859         memset(ca, 0, sizeof(struct sctp_copy_all));
6860
6861         ca->inp = inp;
6862         if (srcv) {
6863                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6864         }
6865         /*
6866          * take off the sendall flag, it would be bad if we failed to do
6867          * this :-0
6868          */
6869         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6870         /* get length and mbuf chain */
6871         if (uio) {
6872                 ca->sndlen = (int)uio->uio_resid;
6873                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6874                 if (ca->m == NULL) {
6875                         SCTP_FREE(ca, SCTP_M_COPYAL);
6876                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6877                         return (ENOMEM);
6878                 }
6879         } else {
6880                 /* Gather the length of the send */
6881                 struct mbuf *mat;
6882
6883                 ca->sndlen = 0;
6884                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6885                         ca->sndlen += SCTP_BUF_LEN(mat);
6886                 }
6887         }
6888         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6889             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6890             SCTP_ASOC_ANY_STATE,
6891             (void *)ca, 0,
6892             sctp_sendall_completes, inp, 1);
6893         if (ret) {
6894                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6895                 SCTP_FREE(ca, SCTP_M_COPYAL);
6896                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6897                 return (EFAULT);
6898         }
6899         return (0);
6900 }
6901
6902
6903 void
6904 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6905 {
6906         struct sctp_tmit_chunk *chk, *nchk;
6907
6908         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6909                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6910                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6911                         if (chk->data) {
6912                                 sctp_m_freem(chk->data);
6913                                 chk->data = NULL;
6914                         }
6915                         asoc->ctrl_queue_cnt--;
6916                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6917                 }
6918         }
6919 }
6920
6921 void
6922 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6923 {
6924         struct sctp_association *asoc;
6925         struct sctp_tmit_chunk *chk, *nchk;
6926         struct sctp_asconf_chunk *acp;
6927
6928         asoc = &stcb->asoc;
6929         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6930                 /* find SCTP_ASCONF chunk in queue */
6931                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6932                         if (chk->data) {
6933                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6934                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6935                                         /* Not Acked yet */
6936                                         break;
6937                                 }
6938                         }
6939                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6940                         if (chk->data) {
6941                                 sctp_m_freem(chk->data);
6942                                 chk->data = NULL;
6943                         }
6944                         asoc->ctrl_queue_cnt--;
6945                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6946                 }
6947         }
6948 }
6949
6950
6951 static void
6952 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6953     struct sctp_association *asoc,
6954     struct sctp_tmit_chunk **data_list,
6955     int bundle_at,
6956     struct sctp_nets *net)
6957 {
6958         int i;
6959         struct sctp_tmit_chunk *tp1;
6960
6961         for (i = 0; i < bundle_at; i++) {
6962                 /* off of the send queue */
6963                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6964                 asoc->send_queue_cnt--;
6965                 if (i > 0) {
6966                         /*
6967                          * Any chunk NOT 0 you zap the time chunk 0 gets
6968                          * zapped or set based on if a RTO measurment is
6969                          * needed.
6970                          */
6971                         data_list[i]->do_rtt = 0;
6972                 }
6973                 /* record time */
6974                 data_list[i]->sent_rcv_time = net->last_sent_time;
6975                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6976                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6977                 if (data_list[i]->whoTo == NULL) {
6978                         data_list[i]->whoTo = net;
6979                         atomic_add_int(&net->ref_count, 1);
6980                 }
6981                 /* on to the sent queue */
6982                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6983                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6984                         struct sctp_tmit_chunk *tpp;
6985
6986                         /* need to move back */
6987         back_up_more:
6988                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6989                         if (tpp == NULL) {
6990                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6991                                 goto all_done;
6992                         }
6993                         tp1 = tpp;
6994                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6995                                 goto back_up_more;
6996                         }
6997                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6998                 } else {
6999                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7000                             data_list[i],
7001                             sctp_next);
7002                 }
7003 all_done:
7004                 /* This does not lower until the cum-ack passes it */
7005                 asoc->sent_queue_cnt++;
7006                 if ((asoc->peers_rwnd <= 0) &&
7007                     (asoc->total_flight == 0) &&
7008                     (bundle_at == 1)) {
7009                         /* Mark the chunk as being a window probe */
7010                         SCTP_STAT_INCR(sctps_windowprobed);
7011                 }
7012 #ifdef SCTP_AUDITING_ENABLED
7013                 sctp_audit_log(0xC2, 3);
7014 #endif
7015                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7016                 data_list[i]->snd_count = 1;
7017                 data_list[i]->rec.data.chunk_was_revoked = 0;
7018                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7019                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7020                             data_list[i]->whoTo->flight_size,
7021                             data_list[i]->book_size,
7022                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7023                             data_list[i]->rec.data.tsn);
7024                 }
7025                 sctp_flight_size_increase(data_list[i]);
7026                 sctp_total_flight_increase(stcb, data_list[i]);
7027                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7028                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7029                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7030                 }
7031                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7032                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7033                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7034                         /* SWS sender side engages */
7035                         asoc->peers_rwnd = 0;
7036                 }
7037         }
7038         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7039                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7040         }
7041 }
7042
7043 static void
7044 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7045 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7046     SCTP_UNUSED
7047 #endif
7048 )
7049 {
7050         struct sctp_tmit_chunk *chk, *nchk;
7051
7052         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7053                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7054                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7055                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7056                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7057                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7058                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7059                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7060                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7061                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7062                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7063                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7064                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7065                         /* Stray chunks must be cleaned up */
7066         clean_up_anyway:
7067                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7068                         if (chk->data) {
7069                                 sctp_m_freem(chk->data);
7070                                 chk->data = NULL;
7071                         }
7072                         asoc->ctrl_queue_cnt--;
7073                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7074                                 asoc->fwd_tsn_cnt--;
7075                         sctp_free_a_chunk(stcb, chk, so_locked);
7076                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7077                         /* special handling, we must look into the param */
7078                         if (chk != asoc->str_reset) {
7079                                 goto clean_up_anyway;
7080                         }
7081                 }
7082         }
7083 }
7084
7085 static uint32_t
7086 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7087     uint32_t space_left, uint32_t frag_point, int eeor_on)
7088 {
7089         /*
7090          * Make a decision on if I should split a msg into multiple parts.
7091          * This is only asked of incomplete messages.
7092          */
7093         if (eeor_on) {
7094                 /*
7095                  * If we are doing EEOR we need to always send it if its the
7096                  * entire thing, since it might be all the guy is putting in
7097                  * the hopper.
7098                  */
7099                 if (space_left >= length) {
7100                         /*-
7101                          * If we have data outstanding,
7102                          * we get another chance when the sack
7103                          * arrives to transmit - wait for more data
7104                          */
7105                         if (stcb->asoc.total_flight == 0) {
7106                                 /*
7107                                  * If nothing is in flight, we zero the
7108                                  * packet counter.
7109                                  */
7110                                 return (length);
7111                         }
7112                         return (0);
7113
7114                 } else {
7115                         /* You can fill the rest */
7116                         return (space_left);
7117                 }
7118         }
7119         /*-
7120          * For those strange folk that make the send buffer
7121          * smaller than our fragmentation point, we can't
7122          * get a full msg in so we have to allow splitting.
7123          */
7124         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7125                 return (length);
7126         }
7127         if ((length <= space_left) ||
7128             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7129                 /* Sub-optimial residual don't split in non-eeor mode. */
7130                 return (0);
7131         }
7132         /*
7133          * If we reach here length is larger than the space_left. Do we wish
7134          * to split it for the sake of packet putting together?
7135          */
7136         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7137                 /* Its ok to split it */
7138                 return (min(space_left, frag_point));
7139         }
7140         /* Nope, can't split */
7141         return (0);
7142 }
7143
7144 static uint32_t
7145 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7146     struct sctp_stream_out *strq,
7147     uint32_t space_left,
7148     uint32_t frag_point,
7149     int *giveup,
7150     int eeor_mode,
7151     int *bail,
7152     int so_locked
7153 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7154     SCTP_UNUSED
7155 #endif
7156 )
7157 {
7158         /* Move from the stream to the send_queue keeping track of the total */
7159         struct sctp_association *asoc;
7160         struct sctp_stream_queue_pending *sp;
7161         struct sctp_tmit_chunk *chk;
7162         struct sctp_data_chunk *dchkh = NULL;
7163         struct sctp_idata_chunk *ndchkh = NULL;
7164         uint32_t to_move, length;
7165         int leading;
7166         uint8_t rcv_flags = 0;
7167         uint8_t some_taken;
7168         uint8_t send_lock_up = 0;
7169
7170         SCTP_TCB_LOCK_ASSERT(stcb);
7171         asoc = &stcb->asoc;
7172 one_more_time:
7173         /* sa_ignore FREED_MEMORY */
7174         sp = TAILQ_FIRST(&strq->outqueue);
7175         if (sp == NULL) {
7176                 if (send_lock_up == 0) {
7177                         SCTP_TCB_SEND_LOCK(stcb);
7178                         send_lock_up = 1;
7179                 }
7180                 sp = TAILQ_FIRST(&strq->outqueue);
7181                 if (sp) {
7182                         goto one_more_time;
7183                 }
7184                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7185                     (stcb->asoc.idata_supported == 0) &&
7186                     (strq->last_msg_incomplete)) {
7187                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7188                             strq->sid,
7189                             strq->last_msg_incomplete);
7190                         strq->last_msg_incomplete = 0;
7191                 }
7192                 to_move = 0;
7193                 if (send_lock_up) {
7194                         SCTP_TCB_SEND_UNLOCK(stcb);
7195                         send_lock_up = 0;
7196                 }
7197                 goto out_of;
7198         }
7199         if ((sp->msg_is_complete) && (sp->length == 0)) {
7200                 if (sp->sender_all_done) {
7201                         /*
7202                          * We are doing differed cleanup. Last time through
7203                          * when we took all the data the sender_all_done was
7204                          * not set.
7205                          */
7206                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7207                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7208                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7209                                     sp->sender_all_done,
7210                                     sp->length,
7211                                     sp->msg_is_complete,
7212                                     sp->put_last_out,
7213                                     send_lock_up);
7214                         }
7215                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7216                                 SCTP_TCB_SEND_LOCK(stcb);
7217                                 send_lock_up = 1;
7218                         }
7219                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7220                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7221                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7222                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7223                             (strq->chunks_on_queues == 0) &&
7224                             TAILQ_EMPTY(&strq->outqueue)) {
7225                                 stcb->asoc.trigger_reset = 1;
7226                         }
7227                         if (sp->net) {
7228                                 sctp_free_remote_addr(sp->net);
7229                                 sp->net = NULL;
7230                         }
7231                         if (sp->data) {
7232                                 sctp_m_freem(sp->data);
7233                                 sp->data = NULL;
7234                         }
7235                         sctp_free_a_strmoq(stcb, sp, so_locked);
7236                         /* we can't be locked to it */
7237                         if (send_lock_up) {
7238                                 SCTP_TCB_SEND_UNLOCK(stcb);
7239                                 send_lock_up = 0;
7240                         }
7241                         /* back to get the next msg */
7242                         goto one_more_time;
7243                 } else {
7244                         /*
7245                          * sender just finished this but still holds a
7246                          * reference
7247                          */
7248                         *giveup = 1;
7249                         to_move = 0;
7250                         goto out_of;
7251                 }
7252         } else {
7253                 /* is there some to get */
7254                 if (sp->length == 0) {
7255                         /* no */
7256                         *giveup = 1;
7257                         to_move = 0;
7258                         goto out_of;
7259                 } else if (sp->discard_rest) {
7260                         if (send_lock_up == 0) {
7261                                 SCTP_TCB_SEND_LOCK(stcb);
7262                                 send_lock_up = 1;
7263                         }
7264                         /* Whack down the size */
7265                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7266                         if ((stcb->sctp_socket != NULL) &&
7267                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7268                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7269                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7270                         }
7271                         if (sp->data) {
7272                                 sctp_m_freem(sp->data);
7273                                 sp->data = NULL;
7274                                 sp->tail_mbuf = NULL;
7275                         }
7276                         sp->length = 0;
7277                         sp->some_taken = 1;
7278                         *giveup = 1;
7279                         to_move = 0;
7280                         goto out_of;
7281                 }
7282         }
7283         some_taken = sp->some_taken;
7284 re_look:
7285         length = sp->length;
7286         if (sp->msg_is_complete) {
7287                 /* The message is complete */
7288                 to_move = min(length, frag_point);
7289                 if (to_move == length) {
7290                         /* All of it fits in the MTU */
7291                         if (sp->some_taken) {
7292                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7293                         } else {
7294                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7295                         }
7296                         sp->put_last_out = 1;
7297                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7298                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7299                         }
7300                 } else {
7301                         /* Not all of it fits, we fragment */
7302                         if (sp->some_taken == 0) {
7303                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7304                         }
7305                         sp->some_taken = 1;
7306                 }
7307         } else {
7308                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7309                 if (to_move) {
7310                         /*-
7311                          * We use a snapshot of length in case it
7312                          * is expanding during the compare.
7313                          */
7314                         uint32_t llen;
7315
7316                         llen = length;
7317                         if (to_move >= llen) {
7318                                 to_move = llen;
7319                                 if (send_lock_up == 0) {
7320                                         /*-
7321                                          * We are taking all of an incomplete msg
7322                                          * thus we need a send lock.
7323                                          */
7324                                         SCTP_TCB_SEND_LOCK(stcb);
7325                                         send_lock_up = 1;
7326                                         if (sp->msg_is_complete) {
7327                                                 /*
7328                                                  * the sender finished the
7329                                                  * msg
7330                                                  */
7331                                                 goto re_look;
7332                                         }
7333                                 }
7334                         }
7335                         if (sp->some_taken == 0) {
7336                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7337                                 sp->some_taken = 1;
7338                         }
7339                 } else {
7340                         /* Nothing to take. */
7341                         *giveup = 1;
7342                         to_move = 0;
7343                         goto out_of;
7344                 }
7345         }
7346
7347         /* If we reach here, we can copy out a chunk */
7348         sctp_alloc_a_chunk(stcb, chk);
7349         if (chk == NULL) {
7350                 /* No chunk memory */
7351                 *giveup = 1;
7352                 to_move = 0;
7353                 goto out_of;
7354         }
7355         /*
7356          * Setup for unordered if needed by looking at the user sent info
7357          * flags.
7358          */
7359         if (sp->sinfo_flags & SCTP_UNORDERED) {
7360                 rcv_flags |= SCTP_DATA_UNORDERED;
7361         }
7362         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7363             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7364                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7365         }
7366         /* clear out the chunk before setting up */
7367         memset(chk, 0, sizeof(*chk));
7368         chk->rec.data.rcv_flags = rcv_flags;
7369
7370         if (to_move >= length) {
7371                 /* we think we can steal the whole thing */
7372                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7373                         SCTP_TCB_SEND_LOCK(stcb);
7374                         send_lock_up = 1;
7375                 }
7376                 if (to_move < sp->length) {
7377                         /* bail, it changed */
7378                         goto dont_do_it;
7379                 }
7380                 chk->data = sp->data;
7381                 chk->last_mbuf = sp->tail_mbuf;
7382                 /* register the stealing */
7383                 sp->data = sp->tail_mbuf = NULL;
7384         } else {
7385                 struct mbuf *m;
7386
7387 dont_do_it:
7388                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7389                 chk->last_mbuf = NULL;
7390                 if (chk->data == NULL) {
7391                         sp->some_taken = some_taken;
7392                         sctp_free_a_chunk(stcb, chk, so_locked);
7393                         *bail = 1;
7394                         to_move = 0;
7395                         goto out_of;
7396                 }
7397 #ifdef SCTP_MBUF_LOGGING
7398                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7399                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7400                 }
7401 #endif
7402                 /* Pull off the data */
7403                 m_adj(sp->data, to_move);
7404                 /* Now lets work our way down and compact it */
7405                 m = sp->data;
7406                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7407                         sp->data = SCTP_BUF_NEXT(m);
7408                         SCTP_BUF_NEXT(m) = NULL;
7409                         if (sp->tail_mbuf == m) {
7410                                 /*-
7411                                  * Freeing tail? TSNH since
7412                                  * we supposedly were taking less
7413                                  * than the sp->length.
7414                                  */
7415 #ifdef INVARIANTS
7416                                 panic("Huh, freing tail? - TSNH");
7417 #else
7418                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7419                                 sp->tail_mbuf = sp->data = NULL;
7420                                 sp->length = 0;
7421 #endif
7422
7423                         }
7424                         sctp_m_free(m);
7425                         m = sp->data;
7426                 }
7427         }
7428         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7429                 chk->copy_by_ref = 1;
7430         } else {
7431                 chk->copy_by_ref = 0;
7432         }
7433         /*
7434          * get last_mbuf and counts of mb usage This is ugly but hopefully
7435          * its only one mbuf.
7436          */
7437         if (chk->last_mbuf == NULL) {
7438                 chk->last_mbuf = chk->data;
7439                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7440                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7441                 }
7442         }
7443         if (to_move > length) {
7444                 /*- This should not happen either
7445                  * since we always lower to_move to the size
7446                  * of sp->length if its larger.
7447                  */
7448 #ifdef INVARIANTS
7449                 panic("Huh, how can to_move be larger?");
7450 #else
7451                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7452                 sp->length = 0;
7453 #endif
7454         } else {
7455                 atomic_subtract_int(&sp->length, to_move);
7456         }
7457         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7458         if (M_LEADINGSPACE(chk->data) < leading) {
7459                 /* Not enough room for a chunk header, get some */
7460                 struct mbuf *m;
7461
7462                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7463                 if (m == NULL) {
7464                         /*
7465                          * we're in trouble here. _PREPEND below will free
7466                          * all the data if there is no leading space, so we
7467                          * must put the data back and restore.
7468                          */
7469                         if (send_lock_up == 0) {
7470                                 SCTP_TCB_SEND_LOCK(stcb);
7471                                 send_lock_up = 1;
7472                         }
7473                         if (sp->data == NULL) {
7474                                 /* unsteal the data */
7475                                 sp->data = chk->data;
7476                                 sp->tail_mbuf = chk->last_mbuf;
7477                         } else {
7478                                 struct mbuf *m_tmp;
7479
7480                                 /* reassemble the data */
7481                                 m_tmp = sp->data;
7482                                 sp->data = chk->data;
7483                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7484                         }
7485                         sp->some_taken = some_taken;
7486                         atomic_add_int(&sp->length, to_move);
7487                         chk->data = NULL;
7488                         *bail = 1;
7489                         sctp_free_a_chunk(stcb, chk, so_locked);
7490                         to_move = 0;
7491                         goto out_of;
7492                 } else {
7493                         SCTP_BUF_LEN(m) = 0;
7494                         SCTP_BUF_NEXT(m) = chk->data;
7495                         chk->data = m;
7496                         M_ALIGN(chk->data, 4);
7497                 }
7498         }
7499         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7500         if (chk->data == NULL) {
7501                 /* HELP, TSNH since we assured it would not above? */
7502 #ifdef INVARIANTS
7503                 panic("prepend failes HELP?");
7504 #else
7505                 SCTP_PRINTF("prepend fails HELP?\n");
7506                 sctp_free_a_chunk(stcb, chk, so_locked);
7507 #endif
7508                 *bail = 1;
7509                 to_move = 0;
7510                 goto out_of;
7511         }
7512         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7513         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7514         chk->book_size_scale = 0;
7515         chk->sent = SCTP_DATAGRAM_UNSENT;
7516
7517         chk->flags = 0;
7518         chk->asoc = &stcb->asoc;
7519         chk->pad_inplace = 0;
7520         chk->no_fr_allowed = 0;
7521         if (stcb->asoc.idata_supported == 0) {
7522                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7523                         /* Just use 0. The receiver ignores the values. */
7524                         chk->rec.data.mid = 0;
7525                 } else {
7526                         chk->rec.data.mid = strq->next_mid_ordered;
7527                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7528                                 strq->next_mid_ordered++;
7529                         }
7530                 }
7531         } else {
7532                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7533                         chk->rec.data.mid = strq->next_mid_unordered;
7534                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7535                                 strq->next_mid_unordered++;
7536                         }
7537                 } else {
7538                         chk->rec.data.mid = strq->next_mid_ordered;
7539                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7540                                 strq->next_mid_ordered++;
7541                         }
7542                 }
7543         }
7544         chk->rec.data.sid = sp->sid;
7545         chk->rec.data.ppid = sp->ppid;
7546         chk->rec.data.context = sp->context;
7547         chk->rec.data.doing_fast_retransmit = 0;
7548
7549         chk->rec.data.timetodrop = sp->ts;
7550         chk->flags = sp->act_flags;
7551
7552         if (sp->net) {
7553                 chk->whoTo = sp->net;
7554                 atomic_add_int(&chk->whoTo->ref_count, 1);
7555         } else
7556                 chk->whoTo = NULL;
7557
7558         if (sp->holds_key_ref) {
7559                 chk->auth_keyid = sp->auth_keyid;
7560                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7561                 chk->holds_key_ref = 1;
7562         }
7563         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7564         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7565                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7566                     (uint32_t)(uintptr_t)stcb, sp->length,
7567                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7568                     chk->rec.data.tsn);
7569         }
7570         if (stcb->asoc.idata_supported == 0) {
7571                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7572         } else {
7573                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7574         }
7575         /*
7576          * Put the rest of the things in place now. Size was done earlier in
7577          * previous loop prior to padding.
7578          */
7579
7580 #ifdef SCTP_ASOCLOG_OF_TSNS
7581         SCTP_TCB_LOCK_ASSERT(stcb);
7582         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7583                 asoc->tsn_out_at = 0;
7584                 asoc->tsn_out_wrapped = 1;
7585         }
7586         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7587         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7588         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7589         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7590         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7591         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7592         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7593         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7594         asoc->tsn_out_at++;
7595 #endif
7596         if (stcb->asoc.idata_supported == 0) {
7597                 dchkh->ch.chunk_type = SCTP_DATA;
7598                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7599                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7600                 dchkh->dp.sid = htons(strq->sid);
7601                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7602                 dchkh->dp.ppid = chk->rec.data.ppid;
7603                 dchkh->ch.chunk_length = htons(chk->send_size);
7604         } else {
7605                 ndchkh->ch.chunk_type = SCTP_IDATA;
7606                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7607                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7608                 ndchkh->dp.sid = htons(strq->sid);
7609                 ndchkh->dp.reserved = htons(0);
7610                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7611                 if (sp->fsn == 0)
7612                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7613                 else
7614                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7615                 sp->fsn++;
7616                 ndchkh->ch.chunk_length = htons(chk->send_size);
7617         }
7618         /* Now advance the chk->send_size by the actual pad needed. */
7619         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7620                 /* need a pad */
7621                 struct mbuf *lm;
7622                 int pads;
7623
7624                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7625                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7626                 if (lm != NULL) {
7627                         chk->last_mbuf = lm;
7628                         chk->pad_inplace = 1;
7629                 }
7630                 chk->send_size += pads;
7631         }
7632         if (PR_SCTP_ENABLED(chk->flags)) {
7633                 asoc->pr_sctp_cnt++;
7634         }
7635         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7636                 /* All done pull and kill the message */
7637                 if (sp->put_last_out == 0) {
7638                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7639                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7640                             sp->sender_all_done,
7641                             sp->length,
7642                             sp->msg_is_complete,
7643                             sp->put_last_out,
7644                             send_lock_up);
7645                 }
7646                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7647                         SCTP_TCB_SEND_LOCK(stcb);
7648                         send_lock_up = 1;
7649                 }
7650                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7651                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7652                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7653                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7654                     (strq->chunks_on_queues == 0) &&
7655                     TAILQ_EMPTY(&strq->outqueue)) {
7656                         stcb->asoc.trigger_reset = 1;
7657                 }
7658                 if (sp->net) {
7659                         sctp_free_remote_addr(sp->net);
7660                         sp->net = NULL;
7661                 }
7662                 if (sp->data) {
7663                         sctp_m_freem(sp->data);
7664                         sp->data = NULL;
7665                 }
7666                 sctp_free_a_strmoq(stcb, sp, so_locked);
7667         }
7668         asoc->chunks_on_out_queue++;
7669         strq->chunks_on_queues++;
7670         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7671         asoc->send_queue_cnt++;
7672 out_of:
7673         if (send_lock_up) {
7674                 SCTP_TCB_SEND_UNLOCK(stcb);
7675         }
7676         return (to_move);
7677 }
7678
7679
7680 static void
7681 sctp_fill_outqueue(struct sctp_tcb *stcb,
7682     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7683 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7684     SCTP_UNUSED
7685 #endif
7686 )
7687 {
7688         struct sctp_association *asoc;
7689         struct sctp_stream_out *strq;
7690         uint32_t space_left, moved, total_moved;
7691         int bail, giveup;
7692
7693         SCTP_TCB_LOCK_ASSERT(stcb);
7694         asoc = &stcb->asoc;
7695         total_moved = 0;
7696         switch (net->ro._l_addr.sa.sa_family) {
7697 #ifdef INET
7698         case AF_INET:
7699                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7700                 break;
7701 #endif
7702 #ifdef INET6
7703         case AF_INET6:
7704                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7705                 break;
7706 #endif
7707         default:
7708                 /* TSNH */
7709                 space_left = net->mtu;
7710                 break;
7711         }
7712         /* Need an allowance for the data chunk header too */
7713         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7714
7715         /* must make even word boundary */
7716         space_left &= 0xfffffffc;
7717         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7718         giveup = 0;
7719         bail = 0;
7720         while ((space_left > 0) && (strq != NULL)) {
7721                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7722                     &giveup, eeor_mode, &bail, so_locked);
7723                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7724                 if ((giveup != 0) || (bail != 0)) {
7725                         break;
7726                 }
7727                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7728                 total_moved += moved;
7729                 space_left -= moved;
7730                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7731                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7732                 } else {
7733                         space_left = 0;
7734                 }
7735                 space_left &= 0xfffffffc;
7736         }
7737         if (bail != 0)
7738                 *quit_now = 1;
7739
7740         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7741
7742         if (total_moved == 0) {
7743                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7744                     (net == stcb->asoc.primary_destination)) {
7745                         /* ran dry for primary network net */
7746                         SCTP_STAT_INCR(sctps_primary_randry);
7747                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7748                         /* ran dry with CMT on */
7749                         SCTP_STAT_INCR(sctps_cmt_randry);
7750                 }
7751         }
7752 }
7753
7754 void
7755 sctp_fix_ecn_echo(struct sctp_association *asoc)
7756 {
7757         struct sctp_tmit_chunk *chk;
7758
7759         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7760                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7761                         chk->sent = SCTP_DATAGRAM_UNSENT;
7762                 }
7763         }
7764 }
7765
7766 void
7767 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7768 {
7769         struct sctp_association *asoc;
7770         struct sctp_tmit_chunk *chk;
7771         struct sctp_stream_queue_pending *sp;
7772         unsigned int i;
7773
7774         if (net == NULL) {
7775                 return;
7776         }
7777         asoc = &stcb->asoc;
7778         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7779                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7780                         if (sp->net == net) {
7781                                 sctp_free_remote_addr(sp->net);
7782                                 sp->net = NULL;
7783                         }
7784                 }
7785         }
7786         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7787                 if (chk->whoTo == net) {
7788                         sctp_free_remote_addr(chk->whoTo);
7789                         chk->whoTo = NULL;
7790                 }
7791         }
7792 }
7793
7794 int
7795 sctp_med_chunk_output(struct sctp_inpcb *inp,
7796     struct sctp_tcb *stcb,
7797     struct sctp_association *asoc,
7798     int *num_out,
7799     int *reason_code,
7800     int control_only, int from_where,
7801     struct timeval *now, int *now_filled, int frag_point, int so_locked
7802 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7803     SCTP_UNUSED
7804 #endif
7805 )
7806 {
7807         /**
7808          * Ok this is the generic chunk service queue. we must do the
7809          * following:
7810          * - Service the stream queue that is next, moving any
7811          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7812          *   LAST to the out queue in one pass) and assigning TSN's. This
7813          *   only applys though if the peer does not support NDATA. For NDATA
7814          *   chunks its ok to not send the entire message ;-)
7815          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7816          *   fomulate and send the low level chunks. Making sure to combine
7817          *   any control in the control chunk queue also.
7818          */
7819         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7820         struct mbuf *outchain, *endoutchain;
7821         struct sctp_tmit_chunk *chk, *nchk;
7822
7823         /* temp arrays for unlinking */
7824         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7825         int no_fragmentflg, error;
7826         unsigned int max_rwnd_per_dest, max_send_per_dest;
7827         int one_chunk, hbflag, skip_data_for_this_net;
7828         int asconf, cookie, no_out_cnt;
7829         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7830         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7831         int tsns_sent = 0;
7832         uint32_t auth_offset = 0;
7833         struct sctp_auth_chunk *auth = NULL;
7834         uint16_t auth_keyid;
7835         int override_ok = 1;
7836         int skip_fill_up = 0;
7837         int data_auth_reqd = 0;
7838
7839         /*
7840          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7841          * destination.
7842          */
7843         int quit_now = 0;
7844
7845         *num_out = 0;
7846         *reason_code = 0;
7847         auth_keyid = stcb->asoc.authinfo.active_keyid;
7848         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7849             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7850             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7851                 eeor_mode = 1;
7852         } else {
7853                 eeor_mode = 0;
7854         }
7855         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7856         /*
7857          * First lets prime the pump. For each destination, if there is room
7858          * in the flight size, attempt to pull an MTU's worth out of the
7859          * stream queues into the general send_queue
7860          */
7861 #ifdef SCTP_AUDITING_ENABLED
7862         sctp_audit_log(0xC2, 2);
7863 #endif
7864         SCTP_TCB_LOCK_ASSERT(stcb);
7865         hbflag = 0;
7866         if (control_only)
7867                 no_data_chunks = 1;
7868         else
7869                 no_data_chunks = 0;
7870
7871         /* Nothing to possible to send? */
7872         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7873             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7874             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7875             TAILQ_EMPTY(&asoc->send_queue) &&
7876             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7877 nothing_to_send:
7878                 *reason_code = 9;
7879                 return (0);
7880         }
7881         if (asoc->peers_rwnd == 0) {
7882                 /* No room in peers rwnd */
7883                 *reason_code = 1;
7884                 if (asoc->total_flight > 0) {
7885                         /* we are allowed one chunk in flight */
7886                         no_data_chunks = 1;
7887                 }
7888         }
7889         if (stcb->asoc.ecn_echo_cnt_onq) {
7890                 /* Record where a sack goes, if any */
7891                 if (no_data_chunks &&
7892                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7893                         /* Nothing but ECNe to send - we don't do that */
7894                         goto nothing_to_send;
7895                 }
7896                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7897                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7898                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7899                                 sack_goes_to = chk->whoTo;
7900                                 break;
7901                         }
7902                 }
7903         }
7904         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7905         if (stcb->sctp_socket)
7906                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7907         else
7908                 max_send_per_dest = 0;
7909         if (no_data_chunks == 0) {
7910                 /* How many non-directed chunks are there? */
7911                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7912                         if (chk->whoTo == NULL) {
7913                                 /*
7914                                  * We already have non-directed chunks on
7915                                  * the queue, no need to do a fill-up.
7916                                  */
7917                                 skip_fill_up = 1;
7918                                 break;
7919                         }
7920                 }
7921
7922         }
7923         if ((no_data_chunks == 0) &&
7924             (skip_fill_up == 0) &&
7925             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7926                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7927                         /*
7928                          * This for loop we are in takes in each net, if
7929                          * its's got space in cwnd and has data sent to it
7930                          * (when CMT is off) then it calls
7931                          * sctp_fill_outqueue for the net. This gets data on
7932                          * the send queue for that network.
7933                          *
7934                          * In sctp_fill_outqueue TSN's are assigned and data
7935                          * is copied out of the stream buffers. Note mostly
7936                          * copy by reference (we hope).
7937                          */
7938                         net->window_probe = 0;
7939                         if ((net != stcb->asoc.alternate) &&
7940                             ((net->dest_state & SCTP_ADDR_PF) ||
7941                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7942                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7943                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7944                                         sctp_log_cwnd(stcb, net, 1,
7945                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7946                                 }
7947                                 continue;
7948                         }
7949                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7950                             (net->flight_size == 0)) {
7951                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7952                         }
7953                         if (net->flight_size >= net->cwnd) {
7954                                 /* skip this network, no room - can't fill */
7955                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7956                                         sctp_log_cwnd(stcb, net, 3,
7957                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7958                                 }
7959                                 continue;
7960                         }
7961                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7962                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7963                         }
7964                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7965                         if (quit_now) {
7966                                 /* memory alloc failure */
7967                                 no_data_chunks = 1;
7968                                 break;
7969                         }
7970                 }
7971         }
7972         /* now service each destination and send out what we can for it */
7973         /* Nothing to send? */
7974         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7975             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7976             TAILQ_EMPTY(&asoc->send_queue)) {
7977                 *reason_code = 8;
7978                 return (0);
7979         }
7980         if (asoc->sctp_cmt_on_off > 0) {
7981                 /* get the last start point */
7982                 start_at = asoc->last_net_cmt_send_started;
7983                 if (start_at == NULL) {
7984                         /* null so to beginning */
7985                         start_at = TAILQ_FIRST(&asoc->nets);
7986                 } else {
7987                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7988                         if (start_at == NULL) {
7989                                 start_at = TAILQ_FIRST(&asoc->nets);
7990                         }
7991                 }
7992                 asoc->last_net_cmt_send_started = start_at;
7993         } else {
7994                 start_at = TAILQ_FIRST(&asoc->nets);
7995         }
7996         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7997                 if (chk->whoTo == NULL) {
7998                         if (asoc->alternate) {
7999                                 chk->whoTo = asoc->alternate;
8000                         } else {
8001                                 chk->whoTo = asoc->primary_destination;
8002                         }
8003                         atomic_add_int(&chk->whoTo->ref_count, 1);
8004                 }
8005         }
8006         old_start_at = NULL;
8007 again_one_more_time:
8008         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8009                 /* how much can we send? */
8010                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8011                 if (old_start_at && (old_start_at == net)) {
8012                         /* through list ocmpletely. */
8013                         break;
8014                 }
8015                 tsns_sent = 0xa;
8016                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8017                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8018                     (net->flight_size >= net->cwnd)) {
8019                         /*
8020                          * Nothing on control or asconf and flight is full,
8021                          * we can skip even in the CMT case.
8022                          */
8023                         continue;
8024                 }
8025                 bundle_at = 0;
8026                 endoutchain = outchain = NULL;
8027                 no_fragmentflg = 1;
8028                 one_chunk = 0;
8029                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8030                         skip_data_for_this_net = 1;
8031                 } else {
8032                         skip_data_for_this_net = 0;
8033                 }
8034                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8035 #ifdef INET
8036                 case AF_INET:
8037                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8038                         break;
8039 #endif
8040 #ifdef INET6
8041                 case AF_INET6:
8042                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8043                         break;
8044 #endif
8045                 default:
8046                         /* TSNH */
8047                         mtu = net->mtu;
8048                         break;
8049                 }
8050                 mx_mtu = mtu;
8051                 to_out = 0;
8052                 if (mtu > asoc->peers_rwnd) {
8053                         if (asoc->total_flight > 0) {
8054                                 /* We have a packet in flight somewhere */
8055                                 r_mtu = asoc->peers_rwnd;
8056                         } else {
8057                                 /* We are always allowed to send one MTU out */
8058                                 one_chunk = 1;
8059                                 r_mtu = mtu;
8060                         }
8061                 } else {
8062                         r_mtu = mtu;
8063                 }
8064                 error = 0;
8065                 /************************/
8066                 /* ASCONF transmission */
8067                 /************************/
8068                 /* Now first lets go through the asconf queue */
8069                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8070                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8071                                 continue;
8072                         }
8073                         if (chk->whoTo == NULL) {
8074                                 if (asoc->alternate == NULL) {
8075                                         if (asoc->primary_destination != net) {
8076                                                 break;
8077                                         }
8078                                 } else {
8079                                         if (asoc->alternate != net) {
8080                                                 break;
8081                                         }
8082                                 }
8083                         } else {
8084                                 if (chk->whoTo != net) {
8085                                         break;
8086                                 }
8087                         }
8088                         if (chk->data == NULL) {
8089                                 break;
8090                         }
8091                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8092                             chk->sent != SCTP_DATAGRAM_RESEND) {
8093                                 break;
8094                         }
8095                         /*
8096                          * if no AUTH is yet included and this chunk
8097                          * requires it, make sure to account for it.  We
8098                          * don't apply the size until the AUTH chunk is
8099                          * actually added below in case there is no room for
8100                          * this chunk. NOTE: we overload the use of "omtu"
8101                          * here
8102                          */
8103                         if ((auth == NULL) &&
8104                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8105                             stcb->asoc.peer_auth_chunks)) {
8106                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8107                         } else
8108                                 omtu = 0;
8109                         /* Here we do NOT factor the r_mtu */
8110                         if ((chk->send_size < (int)(mtu - omtu)) ||
8111                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8112                                 /*
8113                                  * We probably should glom the mbuf chain
8114                                  * from the chk->data for control but the
8115                                  * problem is it becomes yet one more level
8116                                  * of tracking to do if for some reason
8117                                  * output fails. Then I have got to
8118                                  * reconstruct the merged control chain.. el
8119                                  * yucko.. for now we take the easy way and
8120                                  * do the copy
8121                                  */
8122                                 /*
8123                                  * Add an AUTH chunk, if chunk requires it
8124                                  * save the offset into the chain for AUTH
8125                                  */
8126                                 if ((auth == NULL) &&
8127                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8128                                     stcb->asoc.peer_auth_chunks))) {
8129                                         outchain = sctp_add_auth_chunk(outchain,
8130                                             &endoutchain,
8131                                             &auth,
8132                                             &auth_offset,
8133                                             stcb,
8134                                             chk->rec.chunk_id.id);
8135                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8136                                 }
8137                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8138                                     (int)chk->rec.chunk_id.can_take_data,
8139                                     chk->send_size, chk->copy_by_ref);
8140                                 if (outchain == NULL) {
8141                                         *reason_code = 8;
8142                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8143                                         return (ENOMEM);
8144                                 }
8145                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8146                                 /* update our MTU size */
8147                                 if (mtu > (chk->send_size + omtu))
8148                                         mtu -= (chk->send_size + omtu);
8149                                 else
8150                                         mtu = 0;
8151                                 to_out += (chk->send_size + omtu);
8152                                 /* Do clear IP_DF ? */
8153                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8154                                         no_fragmentflg = 0;
8155                                 }
8156                                 if (chk->rec.chunk_id.can_take_data)
8157                                         chk->data = NULL;
8158                                 /*
8159                                  * set hb flag since we can use these for
8160                                  * RTO
8161                                  */
8162                                 hbflag = 1;
8163                                 asconf = 1;
8164                                 /*
8165                                  * should sysctl this: don't bundle data
8166                                  * with ASCONF since it requires AUTH
8167                                  */
8168                                 no_data_chunks = 1;
8169                                 chk->sent = SCTP_DATAGRAM_SENT;
8170                                 if (chk->whoTo == NULL) {
8171                                         chk->whoTo = net;
8172                                         atomic_add_int(&net->ref_count, 1);
8173                                 }
8174                                 chk->snd_count++;
8175                                 if (mtu == 0) {
8176                                         /*
8177                                          * Ok we are out of room but we can
8178                                          * output without effecting the
8179                                          * flight size since this little guy
8180                                          * is a control only packet.
8181                                          */
8182                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8183                                         /*
8184                                          * do NOT clear the asconf flag as
8185                                          * it is used to do appropriate
8186                                          * source address selection.
8187                                          */
8188                                         if (*now_filled == 0) {
8189                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8190                                                 *now_filled = 1;
8191                                         }
8192                                         net->last_sent_time = *now;
8193                                         hbflag = 0;
8194                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8195                                             (struct sockaddr *)&net->ro._l_addr,
8196                                             outchain, auth_offset, auth,
8197                                             stcb->asoc.authinfo.active_keyid,
8198                                             no_fragmentflg, 0, asconf,
8199                                             inp->sctp_lport, stcb->rport,
8200                                             htonl(stcb->asoc.peer_vtag),
8201                                             net->port, NULL,
8202                                             0, 0,
8203                                             so_locked))) {
8204                                                 /*
8205                                                  * error, we could not
8206                                                  * output
8207                                                  */
8208                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8209                                                 if (from_where == 0) {
8210                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8211                                                 }
8212                                                 if (error == ENOBUFS) {
8213                                                         asoc->ifp_had_enobuf = 1;
8214                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8215                                                 }
8216                                                 /* error, could not output */
8217                                                 if (error == EHOSTUNREACH) {
8218                                                         /*
8219                                                          * Destination went
8220                                                          * unreachable
8221                                                          * during this send
8222                                                          */
8223                                                         sctp_move_chunks_from_net(stcb, net);
8224                                                 }
8225                                                 *reason_code = 7;
8226                                                 break;
8227                                         } else {
8228                                                 asoc->ifp_had_enobuf = 0;
8229                                         }
8230                                         /*
8231                                          * increase the number we sent, if a
8232                                          * cookie is sent we don't tell them
8233                                          * any was sent out.
8234                                          */
8235                                         outchain = endoutchain = NULL;
8236                                         auth = NULL;
8237                                         auth_offset = 0;
8238                                         if (!no_out_cnt)
8239                                                 *num_out += ctl_cnt;
8240                                         /* recalc a clean slate and setup */
8241                                         switch (net->ro._l_addr.sa.sa_family) {
8242 #ifdef INET
8243                                         case AF_INET:
8244                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8245                                                 break;
8246 #endif
8247 #ifdef INET6
8248                                         case AF_INET6:
8249                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8250                                                 break;
8251 #endif
8252                                         default:
8253                                                 /* TSNH */
8254                                                 mtu = net->mtu;
8255                                                 break;
8256                                         }
8257                                         to_out = 0;
8258                                         no_fragmentflg = 1;
8259                                 }
8260                         }
8261                 }
8262                 if (error != 0) {
8263                         /* try next net */
8264                         continue;
8265                 }
8266                 /************************/
8267                 /* Control transmission */
8268                 /************************/
8269                 /* Now first lets go through the control queue */
8270                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8271                         if ((sack_goes_to) &&
8272                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8273                             (chk->whoTo != sack_goes_to)) {
8274                                 /*
8275                                  * if we have a sack in queue, and we are
8276                                  * looking at an ecn echo that is NOT queued
8277                                  * to where the sack is going..
8278                                  */
8279                                 if (chk->whoTo == net) {
8280                                         /*
8281                                          * Don't transmit it to where its
8282                                          * going (current net)
8283                                          */
8284                                         continue;
8285                                 } else if (sack_goes_to == net) {
8286                                         /*
8287                                          * But do transmit it to this
8288                                          * address
8289                                          */
8290                                         goto skip_net_check;
8291                                 }
8292                         }
8293                         if (chk->whoTo == NULL) {
8294                                 if (asoc->alternate == NULL) {
8295                                         if (asoc->primary_destination != net) {
8296                                                 continue;
8297                                         }
8298                                 } else {
8299                                         if (asoc->alternate != net) {
8300                                                 continue;
8301                                         }
8302                                 }
8303                         } else {
8304                                 if (chk->whoTo != net) {
8305                                         continue;
8306                                 }
8307                         }
8308         skip_net_check:
8309                         if (chk->data == NULL) {
8310                                 continue;
8311                         }
8312                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8313                                 /*
8314                                  * It must be unsent. Cookies and ASCONF's
8315                                  * hang around but there timers will force
8316                                  * when marked for resend.
8317                                  */
8318                                 continue;
8319                         }
8320                         /*
8321                          * if no AUTH is yet included and this chunk
8322                          * requires it, make sure to account for it.  We
8323                          * don't apply the size until the AUTH chunk is
8324                          * actually added below in case there is no room for
8325                          * this chunk. NOTE: we overload the use of "omtu"
8326                          * here
8327                          */
8328                         if ((auth == NULL) &&
8329                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8330                             stcb->asoc.peer_auth_chunks)) {
8331                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8332                         } else
8333                                 omtu = 0;
8334                         /* Here we do NOT factor the r_mtu */
8335                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8336                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8337                                 /*
8338                                  * We probably should glom the mbuf chain
8339                                  * from the chk->data for control but the
8340                                  * problem is it becomes yet one more level
8341                                  * of tracking to do if for some reason
8342                                  * output fails. Then I have got to
8343                                  * reconstruct the merged control chain.. el
8344                                  * yucko.. for now we take the easy way and
8345                                  * do the copy
8346                                  */
8347                                 /*
8348                                  * Add an AUTH chunk, if chunk requires it
8349                                  * save the offset into the chain for AUTH
8350                                  */
8351                                 if ((auth == NULL) &&
8352                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8353                                     stcb->asoc.peer_auth_chunks))) {
8354                                         outchain = sctp_add_auth_chunk(outchain,
8355                                             &endoutchain,
8356                                             &auth,
8357                                             &auth_offset,
8358                                             stcb,
8359                                             chk->rec.chunk_id.id);
8360                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8361                                 }
8362                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8363                                     (int)chk->rec.chunk_id.can_take_data,
8364                                     chk->send_size, chk->copy_by_ref);
8365                                 if (outchain == NULL) {
8366                                         *reason_code = 8;
8367                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8368                                         return (ENOMEM);
8369                                 }
8370                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8371                                 /* update our MTU size */
8372                                 if (mtu > (chk->send_size + omtu))
8373                                         mtu -= (chk->send_size + omtu);
8374                                 else
8375                                         mtu = 0;
8376                                 to_out += (chk->send_size + omtu);
8377                                 /* Do clear IP_DF ? */
8378                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8379                                         no_fragmentflg = 0;
8380                                 }
8381                                 if (chk->rec.chunk_id.can_take_data)
8382                                         chk->data = NULL;
8383                                 /* Mark things to be removed, if needed */
8384                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8385                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8386                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8387                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8388                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8389                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8390                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8391                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8392                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8393                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8394                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8395                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8396                                                 hbflag = 1;
8397                                         }
8398                                         /* remove these chunks at the end */
8399                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8400                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8401                                                 /* turn off the timer */
8402                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8403                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8404                                                             inp, stcb, net,
8405                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8406                                                 }
8407                                         }
8408                                         ctl_cnt++;
8409                                 } else {
8410                                         /*
8411                                          * Other chunks, since they have
8412                                          * timers running (i.e. COOKIE) we
8413                                          * just "trust" that it gets sent or
8414                                          * retransmitted.
8415                                          */
8416                                         ctl_cnt++;
8417                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8418                                                 cookie = 1;
8419                                                 no_out_cnt = 1;
8420                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8421                                                 /*
8422                                                  * Increment ecne send count
8423                                                  * here this means we may be
8424                                                  * over-zealous in our
8425                                                  * counting if the send
8426                                                  * fails, but its the best
8427                                                  * place to do it (we used
8428                                                  * to do it in the queue of
8429                                                  * the chunk, but that did
8430                                                  * not tell how many times
8431                                                  * it was sent.
8432                                                  */
8433                                                 SCTP_STAT_INCR(sctps_sendecne);
8434                                         }
8435                                         chk->sent = SCTP_DATAGRAM_SENT;
8436                                         if (chk->whoTo == NULL) {
8437                                                 chk->whoTo = net;
8438                                                 atomic_add_int(&net->ref_count, 1);
8439                                         }
8440                                         chk->snd_count++;
8441                                 }
8442                                 if (mtu == 0) {
8443                                         /*
8444                                          * Ok we are out of room but we can
8445                                          * output without effecting the
8446                                          * flight size since this little guy
8447                                          * is a control only packet.
8448                                          */
8449                                         if (asconf) {
8450                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8451                                                 /*
8452                                                  * do NOT clear the asconf
8453                                                  * flag as it is used to do
8454                                                  * appropriate source
8455                                                  * address selection.
8456                                                  */
8457                                         }
8458                                         if (cookie) {
8459                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8460                                                 cookie = 0;
8461                                         }
8462                                         /* Only HB or ASCONF advances time */
8463                                         if (hbflag) {
8464                                                 if (*now_filled == 0) {
8465                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8466                                                         *now_filled = 1;
8467                                                 }
8468                                                 net->last_sent_time = *now;
8469                                                 hbflag = 0;
8470                                         }
8471                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8472                                             (struct sockaddr *)&net->ro._l_addr,
8473                                             outchain,
8474                                             auth_offset, auth,
8475                                             stcb->asoc.authinfo.active_keyid,
8476                                             no_fragmentflg, 0, asconf,
8477                                             inp->sctp_lport, stcb->rport,
8478                                             htonl(stcb->asoc.peer_vtag),
8479                                             net->port, NULL,
8480                                             0, 0,
8481                                             so_locked))) {
8482                                                 /*
8483                                                  * error, we could not
8484                                                  * output
8485                                                  */
8486                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8487                                                 if (from_where == 0) {
8488                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8489                                                 }
8490                                                 if (error == ENOBUFS) {
8491                                                         asoc->ifp_had_enobuf = 1;
8492                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8493                                                 }
8494                                                 if (error == EHOSTUNREACH) {
8495                                                         /*
8496                                                          * Destination went
8497                                                          * unreachable
8498                                                          * during this send
8499                                                          */
8500                                                         sctp_move_chunks_from_net(stcb, net);
8501                                                 }
8502                                                 *reason_code = 7;
8503                                                 break;
8504                                         } else {
8505                                                 asoc->ifp_had_enobuf = 0;
8506                                         }
8507                                         /*
8508                                          * increase the number we sent, if a
8509                                          * cookie is sent we don't tell them
8510                                          * any was sent out.
8511                                          */
8512                                         outchain = endoutchain = NULL;
8513                                         auth = NULL;
8514                                         auth_offset = 0;
8515                                         if (!no_out_cnt)
8516                                                 *num_out += ctl_cnt;
8517                                         /* recalc a clean slate and setup */
8518                                         switch (net->ro._l_addr.sa.sa_family) {
8519 #ifdef INET
8520                                         case AF_INET:
8521                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8522                                                 break;
8523 #endif
8524 #ifdef INET6
8525                                         case AF_INET6:
8526                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8527                                                 break;
8528 #endif
8529                                         default:
8530                                                 /* TSNH */
8531                                                 mtu = net->mtu;
8532                                                 break;
8533                                         }
8534                                         to_out = 0;
8535                                         no_fragmentflg = 1;
8536                                 }
8537                         }
8538                 }
8539                 if (error != 0) {
8540                         /* try next net */
8541                         continue;
8542                 }
8543                 /* JRI: if dest is in PF state, do not send data to it */
8544                 if ((asoc->sctp_cmt_on_off > 0) &&
8545                     (net != stcb->asoc.alternate) &&
8546                     (net->dest_state & SCTP_ADDR_PF)) {
8547                         goto no_data_fill;
8548                 }
8549                 if (net->flight_size >= net->cwnd) {
8550                         goto no_data_fill;
8551                 }
8552                 if ((asoc->sctp_cmt_on_off > 0) &&
8553                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8554                     (net->flight_size > max_rwnd_per_dest)) {
8555                         goto no_data_fill;
8556                 }
8557                 /*
8558                  * We need a specific accounting for the usage of the send
8559                  * buffer. We also need to check the number of messages per
8560                  * net. For now, this is better than nothing and it disabled
8561                  * by default...
8562                  */
8563                 if ((asoc->sctp_cmt_on_off > 0) &&
8564                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8565                     (max_send_per_dest > 0) &&
8566                     (net->flight_size > max_send_per_dest)) {
8567                         goto no_data_fill;
8568                 }
8569                 /*********************/
8570                 /* Data transmission */
8571                 /*********************/
8572                 /*
8573                  * if AUTH for DATA is required and no AUTH has been added
8574                  * yet, account for this in the mtu now... if no data can be
8575                  * bundled, this adjustment won't matter anyways since the
8576                  * packet will be going out...
8577                  */
8578                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8579                     stcb->asoc.peer_auth_chunks);
8580                 if (data_auth_reqd && (auth == NULL)) {
8581                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8582                 }
8583                 /* now lets add any data within the MTU constraints */
8584                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8585 #ifdef INET
8586                 case AF_INET:
8587                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8588                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8589                         else
8590                                 omtu = 0;
8591                         break;
8592 #endif
8593 #ifdef INET6
8594                 case AF_INET6:
8595                         if (net->mtu > SCTP_MIN_OVERHEAD)
8596                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8597                         else
8598                                 omtu = 0;
8599                         break;
8600 #endif
8601                 default:
8602                         /* TSNH */
8603                         omtu = 0;
8604                         break;
8605                 }
8606                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8607                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8608                     (skip_data_for_this_net == 0)) ||
8609                     (cookie)) {
8610                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8611                                 if (no_data_chunks) {
8612                                         /* let only control go out */
8613                                         *reason_code = 1;
8614                                         break;
8615                                 }
8616                                 if (net->flight_size >= net->cwnd) {
8617                                         /* skip this net, no room for data */
8618                                         *reason_code = 2;
8619                                         break;
8620                                 }
8621                                 if ((chk->whoTo != NULL) &&
8622                                     (chk->whoTo != net)) {
8623                                         /* Don't send the chunk on this net */
8624                                         continue;
8625                                 }
8626                                 if (asoc->sctp_cmt_on_off == 0) {
8627                                         if ((asoc->alternate) &&
8628                                             (asoc->alternate != net) &&
8629                                             (chk->whoTo == NULL)) {
8630                                                 continue;
8631                                         } else if ((net != asoc->primary_destination) &&
8632                                                     (asoc->alternate == NULL) &&
8633                                             (chk->whoTo == NULL)) {
8634                                                 continue;
8635                                         }
8636                                 }
8637                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8638                                         /*-
8639                                          * strange, we have a chunk that is
8640                                          * to big for its destination and
8641                                          * yet no fragment ok flag.
8642                                          * Something went wrong when the
8643                                          * PMTU changed...we did not mark
8644                                          * this chunk for some reason?? I
8645                                          * will fix it here by letting IP
8646                                          * fragment it for now and printing
8647                                          * a warning. This really should not
8648                                          * happen ...
8649                                          */
8650                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8651                                             chk->send_size, mtu);
8652                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8653                                 }
8654                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8655                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8656                                         struct sctp_data_chunk *dchkh;
8657
8658                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8659                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8660                                 }
8661                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8662                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8663                                         /* ok we will add this one */
8664
8665                                         /*
8666                                          * Add an AUTH chunk, if chunk
8667                                          * requires it, save the offset into
8668                                          * the chain for AUTH
8669                                          */
8670                                         if (data_auth_reqd) {
8671                                                 if (auth == NULL) {
8672                                                         outchain = sctp_add_auth_chunk(outchain,
8673                                                             &endoutchain,
8674                                                             &auth,
8675                                                             &auth_offset,
8676                                                             stcb,
8677                                                             SCTP_DATA);
8678                                                         auth_keyid = chk->auth_keyid;
8679                                                         override_ok = 0;
8680                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8681                                                 } else if (override_ok) {
8682                                                         /*
8683                                                          * use this data's
8684                                                          * keyid
8685                                                          */
8686                                                         auth_keyid = chk->auth_keyid;
8687                                                         override_ok = 0;
8688                                                 } else if (auth_keyid != chk->auth_keyid) {
8689                                                         /*
8690                                                          * different keyid,
8691                                                          * so done bundling
8692                                                          */
8693                                                         break;
8694                                                 }
8695                                         }
8696                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8697                                             chk->send_size, chk->copy_by_ref);
8698                                         if (outchain == NULL) {
8699                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8700                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8701                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8702                                                 }
8703                                                 *reason_code = 3;
8704                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8705                                                 return (ENOMEM);
8706                                         }
8707                                         /* upate our MTU size */
8708                                         /* Do clear IP_DF ? */
8709                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8710                                                 no_fragmentflg = 0;
8711                                         }
8712                                         /* unsigned subtraction of mtu */
8713                                         if (mtu > chk->send_size)
8714                                                 mtu -= chk->send_size;
8715                                         else
8716                                                 mtu = 0;
8717                                         /* unsigned subtraction of r_mtu */
8718                                         if (r_mtu > chk->send_size)
8719                                                 r_mtu -= chk->send_size;
8720                                         else
8721                                                 r_mtu = 0;
8722
8723                                         to_out += chk->send_size;
8724                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8725 #ifdef INVARIANTS
8726                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8727 #else
8728                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8729                                                     mx_mtu, to_out);
8730 #endif
8731                                         }
8732                                         chk->window_probe = 0;
8733                                         data_list[bundle_at++] = chk;
8734                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8735                                                 break;
8736                                         }
8737                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8738                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8739                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8740                                                 } else {
8741                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8742                                                 }
8743                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8744                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8745                                                         /*
8746                                                          * Count number of
8747                                                          * user msg's that
8748                                                          * were fragmented
8749                                                          * we do this by
8750                                                          * counting when we
8751                                                          * see a LAST
8752                                                          * fragment only.
8753                                                          */
8754                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8755                                         }
8756                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8757                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8758                                                         data_list[0]->window_probe = 1;
8759                                                         net->window_probe = 1;
8760                                                 }
8761                                                 break;
8762                                         }
8763                                 } else {
8764                                         /*
8765                                          * Must be sent in order of the
8766                                          * TSN's (on a network)
8767                                          */
8768                                         break;
8769                                 }
8770                         }       /* for (chunk gather loop for this net) */
8771                 }               /* if asoc.state OPEN */
8772 no_data_fill:
8773                 /* Is there something to send for this destination? */
8774                 if (outchain) {
8775                         /* We may need to start a control timer or two */
8776                         if (asconf) {
8777                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8778                                     stcb, net);
8779                                 /*
8780                                  * do NOT clear the asconf flag as it is
8781                                  * used to do appropriate source address
8782                                  * selection.
8783                                  */
8784                         }
8785                         if (cookie) {
8786                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8787                                 cookie = 0;
8788                         }
8789                         /* must start a send timer if data is being sent */
8790                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8791                                 /*
8792                                  * no timer running on this destination
8793                                  * restart it.
8794                                  */
8795                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8796                         }
8797                         if (bundle_at || hbflag) {
8798                                 /* For data/asconf and hb set time */
8799                                 if (*now_filled == 0) {
8800                                         (void)SCTP_GETTIME_TIMEVAL(now);
8801                                         *now_filled = 1;
8802                                 }
8803                                 net->last_sent_time = *now;
8804                         }
8805                         /* Now send it, if there is anything to send :> */
8806                         if ((error = sctp_lowlevel_chunk_output(inp,
8807                             stcb,
8808                             net,
8809                             (struct sockaddr *)&net->ro._l_addr,
8810                             outchain,
8811                             auth_offset,
8812                             auth,
8813                             auth_keyid,
8814                             no_fragmentflg,
8815                             bundle_at,
8816                             asconf,
8817                             inp->sctp_lport, stcb->rport,
8818                             htonl(stcb->asoc.peer_vtag),
8819                             net->port, NULL,
8820                             0, 0,
8821                             so_locked))) {
8822                                 /* error, we could not output */
8823                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8824                                 if (from_where == 0) {
8825                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8826                                 }
8827                                 if (error == ENOBUFS) {
8828                                         asoc->ifp_had_enobuf = 1;
8829                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8830                                 }
8831                                 if (error == EHOSTUNREACH) {
8832                                         /*
8833                                          * Destination went unreachable
8834                                          * during this send
8835                                          */
8836                                         sctp_move_chunks_from_net(stcb, net);
8837                                 }
8838                                 *reason_code = 6;
8839                                 /*-
8840                                  * I add this line to be paranoid. As far as
8841                                  * I can tell the continue, takes us back to
8842                                  * the top of the for, but just to make sure
8843                                  * I will reset these again here.
8844                                  */
8845                                 ctl_cnt = bundle_at = 0;
8846                                 continue;       /* This takes us back to the
8847                                                  * for() for the nets. */
8848                         } else {
8849                                 asoc->ifp_had_enobuf = 0;
8850                         }
8851                         endoutchain = NULL;
8852                         auth = NULL;
8853                         auth_offset = 0;
8854                         if (!no_out_cnt) {
8855                                 *num_out += (ctl_cnt + bundle_at);
8856                         }
8857                         if (bundle_at) {
8858                                 /* setup for a RTO measurement */
8859                                 tsns_sent = data_list[0]->rec.data.tsn;
8860                                 /* fill time if not already filled */
8861                                 if (*now_filled == 0) {
8862                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8863                                         *now_filled = 1;
8864                                         *now = asoc->time_last_sent;
8865                                 } else {
8866                                         asoc->time_last_sent = *now;
8867                                 }
8868                                 if (net->rto_needed) {
8869                                         data_list[0]->do_rtt = 1;
8870                                         net->rto_needed = 0;
8871                                 }
8872                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8873                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8874                         }
8875                         if (one_chunk) {
8876                                 break;
8877                         }
8878                 }
8879                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8880                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8881                 }
8882         }
8883         if (old_start_at == NULL) {
8884                 old_start_at = start_at;
8885                 start_at = TAILQ_FIRST(&asoc->nets);
8886                 if (old_start_at)
8887                         goto again_one_more_time;
8888         }
8889         /*
8890          * At the end there should be no NON timed chunks hanging on this
8891          * queue.
8892          */
8893         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8894                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8895         }
8896         if ((*num_out == 0) && (*reason_code == 0)) {
8897                 *reason_code = 4;
8898         } else {
8899                 *reason_code = 5;
8900         }
8901         sctp_clean_up_ctl(stcb, asoc, so_locked);
8902         return (0);
8903 }
8904
8905 void
8906 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8907 {
8908         /*-
8909          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8910          * the control chunk queue.
8911          */
8912         struct sctp_chunkhdr *hdr;
8913         struct sctp_tmit_chunk *chk;
8914         struct mbuf *mat, *last_mbuf;
8915         uint32_t chunk_length;
8916         uint16_t padding_length;
8917
8918         SCTP_TCB_LOCK_ASSERT(stcb);
8919         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8920         if (op_err == NULL) {
8921                 return;
8922         }
8923         last_mbuf = NULL;
8924         chunk_length = 0;
8925         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8926                 chunk_length += SCTP_BUF_LEN(mat);
8927                 if (SCTP_BUF_NEXT(mat) == NULL) {
8928                         last_mbuf = mat;
8929                 }
8930         }
8931         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8932                 sctp_m_freem(op_err);
8933                 return;
8934         }
8935         padding_length = chunk_length % 4;
8936         if (padding_length != 0) {
8937                 padding_length = 4 - padding_length;
8938         }
8939         if (padding_length != 0) {
8940                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8941                         sctp_m_freem(op_err);
8942                         return;
8943                 }
8944         }
8945         sctp_alloc_a_chunk(stcb, chk);
8946         if (chk == NULL) {
8947                 /* no memory */
8948                 sctp_m_freem(op_err);
8949                 return;
8950         }
8951         chk->copy_by_ref = 0;
8952         chk->send_size = (uint16_t)chunk_length;
8953         chk->sent = SCTP_DATAGRAM_UNSENT;
8954         chk->snd_count = 0;
8955         chk->asoc = &stcb->asoc;
8956         chk->data = op_err;
8957         chk->whoTo = NULL;
8958         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8959         chk->rec.chunk_id.can_take_data = 0;
8960         hdr = mtod(op_err, struct sctp_chunkhdr *);
8961         hdr->chunk_type = SCTP_OPERATION_ERROR;
8962         hdr->chunk_flags = 0;
8963         hdr->chunk_length = htons(chk->send_size);
8964         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8965         chk->asoc->ctrl_queue_cnt++;
8966 }
8967
8968 int
8969 sctp_send_cookie_echo(struct mbuf *m,
8970     int offset,
8971     struct sctp_tcb *stcb,
8972     struct sctp_nets *net)
8973 {
8974         /*-
8975          * pull out the cookie and put it at the front of the control chunk
8976          * queue.
8977          */
8978         int at;
8979         struct mbuf *cookie;
8980         struct sctp_paramhdr param, *phdr;
8981         struct sctp_chunkhdr *hdr;
8982         struct sctp_tmit_chunk *chk;
8983         uint16_t ptype, plen;
8984
8985         SCTP_TCB_LOCK_ASSERT(stcb);
8986         /* First find the cookie in the param area */
8987         cookie = NULL;
8988         at = offset + sizeof(struct sctp_init_chunk);
8989         for (;;) {
8990                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8991                 if (phdr == NULL) {
8992                         return (-3);
8993                 }
8994                 ptype = ntohs(phdr->param_type);
8995                 plen = ntohs(phdr->param_length);
8996                 if (ptype == SCTP_STATE_COOKIE) {
8997                         int pad;
8998
8999                         /* found the cookie */
9000                         if ((pad = (plen % 4))) {
9001                                 plen += 4 - pad;
9002                         }
9003                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9004                         if (cookie == NULL) {
9005                                 /* No memory */
9006                                 return (-2);
9007                         }
9008 #ifdef SCTP_MBUF_LOGGING
9009                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9010                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9011                         }
9012 #endif
9013                         break;
9014                 }
9015                 at += SCTP_SIZE32(plen);
9016         }
9017         /* ok, we got the cookie lets change it into a cookie echo chunk */
9018         /* first the change from param to cookie */
9019         hdr = mtod(cookie, struct sctp_chunkhdr *);
9020         hdr->chunk_type = SCTP_COOKIE_ECHO;
9021         hdr->chunk_flags = 0;
9022         /* get the chunk stuff now and place it in the FRONT of the queue */
9023         sctp_alloc_a_chunk(stcb, chk);
9024         if (chk == NULL) {
9025                 /* no memory */
9026                 sctp_m_freem(cookie);
9027                 return (-5);
9028         }
9029         chk->copy_by_ref = 0;
9030         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9031         chk->rec.chunk_id.can_take_data = 0;
9032         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9033         chk->send_size = plen;
9034         chk->sent = SCTP_DATAGRAM_UNSENT;
9035         chk->snd_count = 0;
9036         chk->asoc = &stcb->asoc;
9037         chk->data = cookie;
9038         chk->whoTo = net;
9039         atomic_add_int(&chk->whoTo->ref_count, 1);
9040         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9041         chk->asoc->ctrl_queue_cnt++;
9042         return (0);
9043 }
9044
9045 void
9046 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9047     struct mbuf *m,
9048     int offset,
9049     int chk_length,
9050     struct sctp_nets *net)
9051 {
9052         /*
9053          * take a HB request and make it into a HB ack and send it.
9054          */
9055         struct mbuf *outchain;
9056         struct sctp_chunkhdr *chdr;
9057         struct sctp_tmit_chunk *chk;
9058
9059
9060         if (net == NULL)
9061                 /* must have a net pointer */
9062                 return;
9063
9064         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9065         if (outchain == NULL) {
9066                 /* gak out of memory */
9067                 return;
9068         }
9069 #ifdef SCTP_MBUF_LOGGING
9070         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9071                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9072         }
9073 #endif
9074         chdr = mtod(outchain, struct sctp_chunkhdr *);
9075         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9076         chdr->chunk_flags = 0;
9077         if (chk_length % 4) {
9078                 /* need pad */
9079                 uint32_t cpthis = 0;
9080                 int padlen;
9081
9082                 padlen = 4 - (chk_length % 4);
9083                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9084         }
9085         sctp_alloc_a_chunk(stcb, chk);
9086         if (chk == NULL) {
9087                 /* no memory */
9088                 sctp_m_freem(outchain);
9089                 return;
9090         }
9091         chk->copy_by_ref = 0;
9092         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9093         chk->rec.chunk_id.can_take_data = 1;
9094         chk->flags = 0;
9095         chk->send_size = chk_length;
9096         chk->sent = SCTP_DATAGRAM_UNSENT;
9097         chk->snd_count = 0;
9098         chk->asoc = &stcb->asoc;
9099         chk->data = outchain;
9100         chk->whoTo = net;
9101         atomic_add_int(&chk->whoTo->ref_count, 1);
9102         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9103         chk->asoc->ctrl_queue_cnt++;
9104 }
9105
9106 void
9107 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9108 {
9109         /* formulate and queue a cookie-ack back to sender */
9110         struct mbuf *cookie_ack;
9111         struct sctp_chunkhdr *hdr;
9112         struct sctp_tmit_chunk *chk;
9113
9114         SCTP_TCB_LOCK_ASSERT(stcb);
9115
9116         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9117         if (cookie_ack == NULL) {
9118                 /* no mbuf's */
9119                 return;
9120         }
9121         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9122         sctp_alloc_a_chunk(stcb, chk);
9123         if (chk == NULL) {
9124                 /* no memory */
9125                 sctp_m_freem(cookie_ack);
9126                 return;
9127         }
9128         chk->copy_by_ref = 0;
9129         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9130         chk->rec.chunk_id.can_take_data = 1;
9131         chk->flags = 0;
9132         chk->send_size = sizeof(struct sctp_chunkhdr);
9133         chk->sent = SCTP_DATAGRAM_UNSENT;
9134         chk->snd_count = 0;
9135         chk->asoc = &stcb->asoc;
9136         chk->data = cookie_ack;
9137         if (chk->asoc->last_control_chunk_from != NULL) {
9138                 chk->whoTo = chk->asoc->last_control_chunk_from;
9139                 atomic_add_int(&chk->whoTo->ref_count, 1);
9140         } else {
9141                 chk->whoTo = NULL;
9142         }
9143         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9144         hdr->chunk_type = SCTP_COOKIE_ACK;
9145         hdr->chunk_flags = 0;
9146         hdr->chunk_length = htons(chk->send_size);
9147         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9148         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9149         chk->asoc->ctrl_queue_cnt++;
9150         return;
9151 }
9152
9153
9154 void
9155 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9156 {
9157         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9158         struct mbuf *m_shutdown_ack;
9159         struct sctp_shutdown_ack_chunk *ack_cp;
9160         struct sctp_tmit_chunk *chk;
9161
9162         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9163         if (m_shutdown_ack == NULL) {
9164                 /* no mbuf's */
9165                 return;
9166         }
9167         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9168         sctp_alloc_a_chunk(stcb, chk);
9169         if (chk == NULL) {
9170                 /* no memory */
9171                 sctp_m_freem(m_shutdown_ack);
9172                 return;
9173         }
9174         chk->copy_by_ref = 0;
9175         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9176         chk->rec.chunk_id.can_take_data = 1;
9177         chk->flags = 0;
9178         chk->send_size = sizeof(struct sctp_chunkhdr);
9179         chk->sent = SCTP_DATAGRAM_UNSENT;
9180         chk->snd_count = 0;
9181         chk->flags = 0;
9182         chk->asoc = &stcb->asoc;
9183         chk->data = m_shutdown_ack;
9184         chk->whoTo = net;
9185         if (chk->whoTo) {
9186                 atomic_add_int(&chk->whoTo->ref_count, 1);
9187         }
9188         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9189         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9190         ack_cp->ch.chunk_flags = 0;
9191         ack_cp->ch.chunk_length = htons(chk->send_size);
9192         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9193         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9194         chk->asoc->ctrl_queue_cnt++;
9195         return;
9196 }
9197
9198 void
9199 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9200 {
9201         /* formulate and queue a SHUTDOWN to the sender */
9202         struct mbuf *m_shutdown;
9203         struct sctp_shutdown_chunk *shutdown_cp;
9204         struct sctp_tmit_chunk *chk;
9205
9206         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9207                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9208                         /* We already have a SHUTDOWN queued. Reuse it. */
9209                         if (chk->whoTo) {
9210                                 sctp_free_remote_addr(chk->whoTo);
9211                                 chk->whoTo = NULL;
9212                         }
9213                         break;
9214                 }
9215         }
9216         if (chk == NULL) {
9217                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9218                 if (m_shutdown == NULL) {
9219                         /* no mbuf's */
9220                         return;
9221                 }
9222                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9223                 sctp_alloc_a_chunk(stcb, chk);
9224                 if (chk == NULL) {
9225                         /* no memory */
9226                         sctp_m_freem(m_shutdown);
9227                         return;
9228                 }
9229                 chk->copy_by_ref = 0;
9230                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9231                 chk->rec.chunk_id.can_take_data = 1;
9232                 chk->flags = 0;
9233                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9234                 chk->sent = SCTP_DATAGRAM_UNSENT;
9235                 chk->snd_count = 0;
9236                 chk->flags = 0;
9237                 chk->asoc = &stcb->asoc;
9238                 chk->data = m_shutdown;
9239                 chk->whoTo = net;
9240                 if (chk->whoTo) {
9241                         atomic_add_int(&chk->whoTo->ref_count, 1);
9242                 }
9243                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9244                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9245                 shutdown_cp->ch.chunk_flags = 0;
9246                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9247                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9248                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9249                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9250                 chk->asoc->ctrl_queue_cnt++;
9251         } else {
9252                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9253                 chk->whoTo = net;
9254                 if (chk->whoTo) {
9255                         atomic_add_int(&chk->whoTo->ref_count, 1);
9256                 }
9257                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9258                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9259                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9260         }
9261         return;
9262 }
9263
9264 void
9265 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9266 {
9267         /*
9268          * formulate and queue an ASCONF to the peer. ASCONF parameters
9269          * should be queued on the assoc queue.
9270          */
9271         struct sctp_tmit_chunk *chk;
9272         struct mbuf *m_asconf;
9273         int len;
9274
9275         SCTP_TCB_LOCK_ASSERT(stcb);
9276
9277         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9278             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9279                 /* can't send a new one if there is one in flight already */
9280                 return;
9281         }
9282         /* compose an ASCONF chunk, maximum length is PMTU */
9283         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9284         if (m_asconf == NULL) {
9285                 return;
9286         }
9287         sctp_alloc_a_chunk(stcb, chk);
9288         if (chk == NULL) {
9289                 /* no memory */
9290                 sctp_m_freem(m_asconf);
9291                 return;
9292         }
9293         chk->copy_by_ref = 0;
9294         chk->rec.chunk_id.id = SCTP_ASCONF;
9295         chk->rec.chunk_id.can_take_data = 0;
9296         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9297         chk->data = m_asconf;
9298         chk->send_size = len;
9299         chk->sent = SCTP_DATAGRAM_UNSENT;
9300         chk->snd_count = 0;
9301         chk->asoc = &stcb->asoc;
9302         chk->whoTo = net;
9303         if (chk->whoTo) {
9304                 atomic_add_int(&chk->whoTo->ref_count, 1);
9305         }
9306         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9307         chk->asoc->ctrl_queue_cnt++;
9308         return;
9309 }
9310
9311 void
9312 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9313 {
9314         /*
9315          * formulate and queue a asconf-ack back to sender. the asconf-ack
9316          * must be stored in the tcb.
9317          */
9318         struct sctp_tmit_chunk *chk;
9319         struct sctp_asconf_ack *ack, *latest_ack;
9320         struct mbuf *m_ack;
9321         struct sctp_nets *net = NULL;
9322
9323         SCTP_TCB_LOCK_ASSERT(stcb);
9324         /* Get the latest ASCONF-ACK */
9325         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9326         if (latest_ack == NULL) {
9327                 return;
9328         }
9329         if (latest_ack->last_sent_to != NULL &&
9330             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9331                 /* we're doing a retransmission */
9332                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9333                 if (net == NULL) {
9334                         /* no alternate */
9335                         if (stcb->asoc.last_control_chunk_from == NULL) {
9336                                 if (stcb->asoc.alternate) {
9337                                         net = stcb->asoc.alternate;
9338                                 } else {
9339                                         net = stcb->asoc.primary_destination;
9340                                 }
9341                         } else {
9342                                 net = stcb->asoc.last_control_chunk_from;
9343                         }
9344                 }
9345         } else {
9346                 /* normal case */
9347                 if (stcb->asoc.last_control_chunk_from == NULL) {
9348                         if (stcb->asoc.alternate) {
9349                                 net = stcb->asoc.alternate;
9350                         } else {
9351                                 net = stcb->asoc.primary_destination;
9352                         }
9353                 } else {
9354                         net = stcb->asoc.last_control_chunk_from;
9355                 }
9356         }
9357         latest_ack->last_sent_to = net;
9358
9359         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9360                 if (ack->data == NULL) {
9361                         continue;
9362                 }
9363                 /* copy the asconf_ack */
9364                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9365                 if (m_ack == NULL) {
9366                         /* couldn't copy it */
9367                         return;
9368                 }
9369 #ifdef SCTP_MBUF_LOGGING
9370                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9371                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9372                 }
9373 #endif
9374
9375                 sctp_alloc_a_chunk(stcb, chk);
9376                 if (chk == NULL) {
9377                         /* no memory */
9378                         if (m_ack)
9379                                 sctp_m_freem(m_ack);
9380                         return;
9381                 }
9382                 chk->copy_by_ref = 0;
9383                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9384                 chk->rec.chunk_id.can_take_data = 1;
9385                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9386                 chk->whoTo = net;
9387                 if (chk->whoTo) {
9388                         atomic_add_int(&chk->whoTo->ref_count, 1);
9389                 }
9390                 chk->data = m_ack;
9391                 chk->send_size = ack->len;
9392                 chk->sent = SCTP_DATAGRAM_UNSENT;
9393                 chk->snd_count = 0;
9394                 chk->asoc = &stcb->asoc;
9395
9396                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9397                 chk->asoc->ctrl_queue_cnt++;
9398         }
9399         return;
9400 }
9401
9402
9403 static int
9404 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9405     struct sctp_tcb *stcb,
9406     struct sctp_association *asoc,
9407     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9408 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9409     SCTP_UNUSED
9410 #endif
9411 )
9412 {
9413         /*-
9414          * send out one MTU of retransmission. If fast_retransmit is
9415          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9416          * rwnd. For a Cookie or Asconf in the control chunk queue we
9417          * retransmit them by themselves.
9418          *
9419          * For data chunks we will pick out the lowest TSN's in the sent_queue
9420          * marked for resend and bundle them all together (up to a MTU of
9421          * destination). The address to send to should have been
9422          * selected/changed where the retransmission was marked (i.e. in FR
9423          * or t3-timeout routines).
9424          */
9425         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9426         struct sctp_tmit_chunk *chk, *fwd;
9427         struct mbuf *m, *endofchain;
9428         struct sctp_nets *net = NULL;
9429         uint32_t tsns_sent = 0;
9430         int no_fragmentflg, bundle_at, cnt_thru;
9431         unsigned int mtu;
9432         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9433         struct sctp_auth_chunk *auth = NULL;
9434         uint32_t auth_offset = 0;
9435         uint16_t auth_keyid;
9436         int override_ok = 1;
9437         int data_auth_reqd = 0;
9438         uint32_t dmtu = 0;
9439
9440         SCTP_TCB_LOCK_ASSERT(stcb);
9441         tmr_started = ctl_cnt = bundle_at = error = 0;
9442         no_fragmentflg = 1;
9443         fwd_tsn = 0;
9444         *cnt_out = 0;
9445         fwd = NULL;
9446         endofchain = m = NULL;
9447         auth_keyid = stcb->asoc.authinfo.active_keyid;
9448 #ifdef SCTP_AUDITING_ENABLED
9449         sctp_audit_log(0xC3, 1);
9450 #endif
9451         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9452             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9453                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9454                     asoc->sent_queue_retran_cnt);
9455                 asoc->sent_queue_cnt = 0;
9456                 asoc->sent_queue_cnt_removeable = 0;
9457                 /* send back 0/0 so we enter normal transmission */
9458                 *cnt_out = 0;
9459                 return (0);
9460         }
9461         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9462                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9463                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9464                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9465                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9466                                 continue;
9467                         }
9468                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9469                                 if (chk != asoc->str_reset) {
9470                                         /*
9471                                          * not eligible for retran if its
9472                                          * not ours
9473                                          */
9474                                         continue;
9475                                 }
9476                         }
9477                         ctl_cnt++;
9478                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9479                                 fwd_tsn = 1;
9480                         }
9481                         /*
9482                          * Add an AUTH chunk, if chunk requires it save the
9483                          * offset into the chain for AUTH
9484                          */
9485                         if ((auth == NULL) &&
9486                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9487                             stcb->asoc.peer_auth_chunks))) {
9488                                 m = sctp_add_auth_chunk(m, &endofchain,
9489                                     &auth, &auth_offset,
9490                                     stcb,
9491                                     chk->rec.chunk_id.id);
9492                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9493                         }
9494                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9495                         break;
9496                 }
9497         }
9498         one_chunk = 0;
9499         cnt_thru = 0;
9500         /* do we have control chunks to retransmit? */
9501         if (m != NULL) {
9502                 /* Start a timer no matter if we succeed or fail */
9503                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9504                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9505                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9506                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9507                 chk->snd_count++;       /* update our count */
9508                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9509                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9510                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9511                     no_fragmentflg, 0, 0,
9512                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9513                     chk->whoTo->port, NULL,
9514                     0, 0,
9515                     so_locked))) {
9516                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9517                         if (error == ENOBUFS) {
9518                                 asoc->ifp_had_enobuf = 1;
9519                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9520                         }
9521                         return (error);
9522                 } else {
9523                         asoc->ifp_had_enobuf = 0;
9524                 }
9525                 endofchain = NULL;
9526                 auth = NULL;
9527                 auth_offset = 0;
9528                 /*
9529                  * We don't want to mark the net->sent time here since this
9530                  * we use this for HB and retrans cannot measure RTT
9531                  */
9532                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9533                 *cnt_out += 1;
9534                 chk->sent = SCTP_DATAGRAM_SENT;
9535                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9536                 if (fwd_tsn == 0) {
9537                         return (0);
9538                 } else {
9539                         /* Clean up the fwd-tsn list */
9540                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9541                         return (0);
9542                 }
9543         }
9544         /*
9545          * Ok, it is just data retransmission we need to do or that and a
9546          * fwd-tsn with it all.
9547          */
9548         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9549                 return (SCTP_RETRAN_DONE);
9550         }
9551         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9552             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9553                 /* not yet open, resend the cookie and that is it */
9554                 return (1);
9555         }
9556 #ifdef SCTP_AUDITING_ENABLED
9557         sctp_auditing(20, inp, stcb, NULL);
9558 #endif
9559         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9560         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9561                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9562                         /* No, not sent to this net or not ready for rtx */
9563                         continue;
9564                 }
9565                 if (chk->data == NULL) {
9566                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9567                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9568                         continue;
9569                 }
9570                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9571                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9572                         struct mbuf *op_err;
9573                         char msg[SCTP_DIAG_INFO_LEN];
9574
9575                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9576                             chk->rec.data.tsn, chk->snd_count);
9577                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9578                             msg);
9579                         atomic_add_int(&stcb->asoc.refcnt, 1);
9580                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9581                             so_locked);
9582                         SCTP_TCB_LOCK(stcb);
9583                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9584                         return (SCTP_RETRAN_EXIT);
9585                 }
9586                 /* pick up the net */
9587                 net = chk->whoTo;
9588                 switch (net->ro._l_addr.sa.sa_family) {
9589 #ifdef INET
9590                 case AF_INET:
9591                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9592                         break;
9593 #endif
9594 #ifdef INET6
9595                 case AF_INET6:
9596                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9597                         break;
9598 #endif
9599                 default:
9600                         /* TSNH */
9601                         mtu = net->mtu;
9602                         break;
9603                 }
9604
9605                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9606                         /* No room in peers rwnd */
9607                         uint32_t tsn;
9608
9609                         tsn = asoc->last_acked_seq + 1;
9610                         if (tsn == chk->rec.data.tsn) {
9611                                 /*
9612                                  * we make a special exception for this
9613                                  * case. The peer has no rwnd but is missing
9614                                  * the lowest chunk.. which is probably what
9615                                  * is holding up the rwnd.
9616                                  */
9617                                 goto one_chunk_around;
9618                         }
9619                         return (1);
9620                 }
9621 one_chunk_around:
9622                 if (asoc->peers_rwnd < mtu) {
9623                         one_chunk = 1;
9624                         if ((asoc->peers_rwnd == 0) &&
9625                             (asoc->total_flight == 0)) {
9626                                 chk->window_probe = 1;
9627                                 chk->whoTo->window_probe = 1;
9628                         }
9629                 }
9630 #ifdef SCTP_AUDITING_ENABLED
9631                 sctp_audit_log(0xC3, 2);
9632 #endif
9633                 bundle_at = 0;
9634                 m = NULL;
9635                 net->fast_retran_ip = 0;
9636                 if (chk->rec.data.doing_fast_retransmit == 0) {
9637                         /*
9638                          * if no FR in progress skip destination that have
9639                          * flight_size > cwnd.
9640                          */
9641                         if (net->flight_size >= net->cwnd) {
9642                                 continue;
9643                         }
9644                 } else {
9645                         /*
9646                          * Mark the destination net to have FR recovery
9647                          * limits put on it.
9648                          */
9649                         *fr_done = 1;
9650                         net->fast_retran_ip = 1;
9651                 }
9652
9653                 /*
9654                  * if no AUTH is yet included and this chunk requires it,
9655                  * make sure to account for it.  We don't apply the size
9656                  * until the AUTH chunk is actually added below in case
9657                  * there is no room for this chunk.
9658                  */
9659                 if (data_auth_reqd && (auth == NULL)) {
9660                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9661                 } else
9662                         dmtu = 0;
9663
9664                 if ((chk->send_size <= (mtu - dmtu)) ||
9665                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9666                         /* ok we will add this one */
9667                         if (data_auth_reqd) {
9668                                 if (auth == NULL) {
9669                                         m = sctp_add_auth_chunk(m,
9670                                             &endofchain,
9671                                             &auth,
9672                                             &auth_offset,
9673                                             stcb,
9674                                             SCTP_DATA);
9675                                         auth_keyid = chk->auth_keyid;
9676                                         override_ok = 0;
9677                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9678                                 } else if (override_ok) {
9679                                         auth_keyid = chk->auth_keyid;
9680                                         override_ok = 0;
9681                                 } else if (chk->auth_keyid != auth_keyid) {
9682                                         /* different keyid, so done bundling */
9683                                         break;
9684                                 }
9685                         }
9686                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9687                         if (m == NULL) {
9688                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9689                                 return (ENOMEM);
9690                         }
9691                         /* Do clear IP_DF ? */
9692                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9693                                 no_fragmentflg = 0;
9694                         }
9695                         /* upate our MTU size */
9696                         if (mtu > (chk->send_size + dmtu))
9697                                 mtu -= (chk->send_size + dmtu);
9698                         else
9699                                 mtu = 0;
9700                         data_list[bundle_at++] = chk;
9701                         if (one_chunk && (asoc->total_flight <= 0)) {
9702                                 SCTP_STAT_INCR(sctps_windowprobed);
9703                         }
9704                 }
9705                 if (one_chunk == 0) {
9706                         /*
9707                          * now are there anymore forward from chk to pick
9708                          * up?
9709                          */
9710                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9711                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9712                                         /* Nope, not for retran */
9713                                         continue;
9714                                 }
9715                                 if (fwd->whoTo != net) {
9716                                         /* Nope, not the net in question */
9717                                         continue;
9718                                 }
9719                                 if (data_auth_reqd && (auth == NULL)) {
9720                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9721                                 } else
9722                                         dmtu = 0;
9723                                 if (fwd->send_size <= (mtu - dmtu)) {
9724                                         if (data_auth_reqd) {
9725                                                 if (auth == NULL) {
9726                                                         m = sctp_add_auth_chunk(m,
9727                                                             &endofchain,
9728                                                             &auth,
9729                                                             &auth_offset,
9730                                                             stcb,
9731                                                             SCTP_DATA);
9732                                                         auth_keyid = fwd->auth_keyid;
9733                                                         override_ok = 0;
9734                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9735                                                 } else if (override_ok) {
9736                                                         auth_keyid = fwd->auth_keyid;
9737                                                         override_ok = 0;
9738                                                 } else if (fwd->auth_keyid != auth_keyid) {
9739                                                         /*
9740                                                          * different keyid,
9741                                                          * so done bundling
9742                                                          */
9743                                                         break;
9744                                                 }
9745                                         }
9746                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9747                                         if (m == NULL) {
9748                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9749                                                 return (ENOMEM);
9750                                         }
9751                                         /* Do clear IP_DF ? */
9752                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9753                                                 no_fragmentflg = 0;
9754                                         }
9755                                         /* upate our MTU size */
9756                                         if (mtu > (fwd->send_size + dmtu))
9757                                                 mtu -= (fwd->send_size + dmtu);
9758                                         else
9759                                                 mtu = 0;
9760                                         data_list[bundle_at++] = fwd;
9761                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9762                                                 break;
9763                                         }
9764                                 } else {
9765                                         /* can't fit so we are done */
9766                                         break;
9767                                 }
9768                         }
9769                 }
9770                 /* Is there something to send for this destination? */
9771                 if (m) {
9772                         /*
9773                          * No matter if we fail/or succeed we should start a
9774                          * timer. A failure is like a lost IP packet :-)
9775                          */
9776                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9777                                 /*
9778                                  * no timer running on this destination
9779                                  * restart it.
9780                                  */
9781                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9782                                 tmr_started = 1;
9783                         }
9784                         /* Now lets send it, if there is anything to send :> */
9785                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9786                             (struct sockaddr *)&net->ro._l_addr, m,
9787                             auth_offset, auth, auth_keyid,
9788                             no_fragmentflg, 0, 0,
9789                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9790                             net->port, NULL,
9791                             0, 0,
9792                             so_locked))) {
9793                                 /* error, we could not output */
9794                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9795                                 if (error == ENOBUFS) {
9796                                         asoc->ifp_had_enobuf = 1;
9797                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9798                                 }
9799                                 return (error);
9800                         } else {
9801                                 asoc->ifp_had_enobuf = 0;
9802                         }
9803                         endofchain = NULL;
9804                         auth = NULL;
9805                         auth_offset = 0;
9806                         /* For HB's */
9807                         /*
9808                          * We don't want to mark the net->sent time here
9809                          * since this we use this for HB and retrans cannot
9810                          * measure RTT
9811                          */
9812                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9813
9814                         /* For auto-close */
9815                         cnt_thru++;
9816                         if (*now_filled == 0) {
9817                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9818                                 *now = asoc->time_last_sent;
9819                                 *now_filled = 1;
9820                         } else {
9821                                 asoc->time_last_sent = *now;
9822                         }
9823                         *cnt_out += bundle_at;
9824 #ifdef SCTP_AUDITING_ENABLED
9825                         sctp_audit_log(0xC4, bundle_at);
9826 #endif
9827                         if (bundle_at) {
9828                                 tsns_sent = data_list[0]->rec.data.tsn;
9829                         }
9830                         for (i = 0; i < bundle_at; i++) {
9831                                 SCTP_STAT_INCR(sctps_sendretransdata);
9832                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9833                                 /*
9834                                  * When we have a revoked data, and we
9835                                  * retransmit it, then we clear the revoked
9836                                  * flag since this flag dictates if we
9837                                  * subtracted from the fs
9838                                  */
9839                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9840                                         /* Deflate the cwnd */
9841                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9842                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9843                                 }
9844                                 data_list[i]->snd_count++;
9845                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9846                                 /* record the time */
9847                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9848                                 if (data_list[i]->book_size_scale) {
9849                                         /*
9850                                          * need to double the book size on
9851                                          * this one
9852                                          */
9853                                         data_list[i]->book_size_scale = 0;
9854                                         /*
9855                                          * Since we double the booksize, we
9856                                          * must also double the output queue
9857                                          * size, since this get shrunk when
9858                                          * we free by this amount.
9859                                          */
9860                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9861                                         data_list[i]->book_size *= 2;
9862
9863
9864                                 } else {
9865                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9866                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9867                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9868                                         }
9869                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9870                                             (uint32_t)(data_list[i]->send_size +
9871                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9872                                 }
9873                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9874                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9875                                             data_list[i]->whoTo->flight_size,
9876                                             data_list[i]->book_size,
9877                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9878                                             data_list[i]->rec.data.tsn);
9879                                 }
9880                                 sctp_flight_size_increase(data_list[i]);
9881                                 sctp_total_flight_increase(stcb, data_list[i]);
9882                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9883                                         /* SWS sender side engages */
9884                                         asoc->peers_rwnd = 0;
9885                                 }
9886                                 if ((i == 0) &&
9887                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9888                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9889                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9890                                             (tmr_started == 0)) {
9891                                                 /*-
9892                                                  * ok we just fast-retrans'd
9893                                                  * the lowest TSN, i.e the
9894                                                  * first on the list. In
9895                                                  * this case we want to give
9896                                                  * some more time to get a
9897                                                  * SACK back without a
9898                                                  * t3-expiring.
9899                                                  */
9900                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9901                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9902                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9903                                         }
9904                                 }
9905                         }
9906                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9907                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9908                         }
9909 #ifdef SCTP_AUDITING_ENABLED
9910                         sctp_auditing(21, inp, stcb, NULL);
9911 #endif
9912                 } else {
9913                         /* None will fit */
9914                         return (1);
9915                 }
9916                 if (asoc->sent_queue_retran_cnt <= 0) {
9917                         /* all done we have no more to retran */
9918                         asoc->sent_queue_retran_cnt = 0;
9919                         break;
9920                 }
9921                 if (one_chunk) {
9922                         /* No more room in rwnd */
9923                         return (1);
9924                 }
9925                 /* stop the for loop here. we sent out a packet */
9926                 break;
9927         }
9928         return (0);
9929 }
9930
9931 static void
9932 sctp_timer_validation(struct sctp_inpcb *inp,
9933     struct sctp_tcb *stcb,
9934     struct sctp_association *asoc)
9935 {
9936         struct sctp_nets *net;
9937
9938         /* Validate that a timer is running somewhere */
9939         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9940                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9941                         /* Here is a timer */
9942                         return;
9943                 }
9944         }
9945         SCTP_TCB_LOCK_ASSERT(stcb);
9946         /* Gak, we did not have a timer somewhere */
9947         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9948         if (asoc->alternate) {
9949                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9950         } else {
9951                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9952         }
9953         return;
9954 }
9955
9956 void
9957 sctp_chunk_output(struct sctp_inpcb *inp,
9958     struct sctp_tcb *stcb,
9959     int from_where,
9960     int so_locked
9961 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9962     SCTP_UNUSED
9963 #endif
9964 )
9965 {
9966         /*-
9967          * Ok this is the generic chunk service queue. we must do the
9968          * following:
9969          * - See if there are retransmits pending, if so we must
9970          *   do these first.
9971          * - Service the stream queue that is next, moving any
9972          *   message (note I must get a complete message i.e.
9973          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9974          *   TSN's
9975          * - Check to see if the cwnd/rwnd allows any output, if so we
9976          *   go ahead and fomulate and send the low level chunks. Making sure
9977          *   to combine any control in the control chunk queue also.
9978          */
9979         struct sctp_association *asoc;
9980         struct sctp_nets *net;
9981         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9982         unsigned int burst_cnt = 0;
9983         struct timeval now;
9984         int now_filled = 0;
9985         int nagle_on;
9986         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9987         int un_sent = 0;
9988         int fr_done;
9989         unsigned int tot_frs = 0;
9990
9991         asoc = &stcb->asoc;
9992 do_it_again:
9993         /* The Nagle algorithm is only applied when handling a send call. */
9994         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9995                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9996                         nagle_on = 0;
9997                 } else {
9998                         nagle_on = 1;
9999                 }
10000         } else {
10001                 nagle_on = 0;
10002         }
10003         SCTP_TCB_LOCK_ASSERT(stcb);
10004
10005         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10006
10007         if ((un_sent <= 0) &&
10008             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10009             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10010             (asoc->sent_queue_retran_cnt == 0) &&
10011             (asoc->trigger_reset == 0)) {
10012                 /* Nothing to do unless there is something to be sent left */
10013                 return;
10014         }
10015         /*
10016          * Do we have something to send, data or control AND a sack timer
10017          * running, if so piggy-back the sack.
10018          */
10019         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10020                 sctp_send_sack(stcb, so_locked);
10021                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10022         }
10023         while (asoc->sent_queue_retran_cnt) {
10024                 /*-
10025                  * Ok, it is retransmission time only, we send out only ONE
10026                  * packet with a single call off to the retran code.
10027                  */
10028                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10029                         /*-
10030                          * Special hook for handling cookiess discarded
10031                          * by peer that carried data. Send cookie-ack only
10032                          * and then the next call with get the retran's.
10033                          */
10034                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10035                             from_where,
10036                             &now, &now_filled, frag_point, so_locked);
10037                         return;
10038                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10039                         /* if its not from a HB then do it */
10040                         fr_done = 0;
10041                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10042                         if (fr_done) {
10043                                 tot_frs++;
10044                         }
10045                 } else {
10046                         /*
10047                          * its from any other place, we don't allow retran
10048                          * output (only control)
10049                          */
10050                         ret = 1;
10051                 }
10052                 if (ret > 0) {
10053                         /* Can't send anymore */
10054                         /*-
10055                          * now lets push out control by calling med-level
10056                          * output once. this assures that we WILL send HB's
10057                          * if queued too.
10058                          */
10059                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10060                             from_where,
10061                             &now, &now_filled, frag_point, so_locked);
10062 #ifdef SCTP_AUDITING_ENABLED
10063                         sctp_auditing(8, inp, stcb, NULL);
10064 #endif
10065                         sctp_timer_validation(inp, stcb, asoc);
10066                         return;
10067                 }
10068                 if (ret < 0) {
10069                         /*-
10070                          * The count was off.. retran is not happening so do
10071                          * the normal retransmission.
10072                          */
10073 #ifdef SCTP_AUDITING_ENABLED
10074                         sctp_auditing(9, inp, stcb, NULL);
10075 #endif
10076                         if (ret == SCTP_RETRAN_EXIT) {
10077                                 return;
10078                         }
10079                         break;
10080                 }
10081                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10082                         /* Only one transmission allowed out of a timeout */
10083 #ifdef SCTP_AUDITING_ENABLED
10084                         sctp_auditing(10, inp, stcb, NULL);
10085 #endif
10086                         /* Push out any control */
10087                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10088                             &now, &now_filled, frag_point, so_locked);
10089                         return;
10090                 }
10091                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10092                         /* Hit FR burst limit */
10093                         return;
10094                 }
10095                 if ((num_out == 0) && (ret == 0)) {
10096                         /* No more retrans to send */
10097                         break;
10098                 }
10099         }
10100 #ifdef SCTP_AUDITING_ENABLED
10101         sctp_auditing(12, inp, stcb, NULL);
10102 #endif
10103         /* Check for bad destinations, if they exist move chunks around. */
10104         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10105                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10106                         /*-
10107                          * if possible move things off of this address we
10108                          * still may send below due to the dormant state but
10109                          * we try to find an alternate address to send to
10110                          * and if we have one we move all queued data on the
10111                          * out wheel to this alternate address.
10112                          */
10113                         if (net->ref_count > 1)
10114                                 sctp_move_chunks_from_net(stcb, net);
10115                 } else {
10116                         /*-
10117                          * if ((asoc->sat_network) || (net->addr_is_local))
10118                          * { burst_limit = asoc->max_burst *
10119                          * SCTP_SAT_NETWORK_BURST_INCR; }
10120                          */
10121                         if (asoc->max_burst > 0) {
10122                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10123                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10124                                                 /*
10125                                                  * JRS - Use the congestion
10126                                                  * control given in the
10127                                                  * congestion control module
10128                                                  */
10129                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10130                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10131                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10132                                                 }
10133                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10134                                         }
10135                                         net->fast_retran_ip = 0;
10136                                 } else {
10137                                         if (net->flight_size == 0) {
10138                                                 /*
10139                                                  * Should be decaying the
10140                                                  * cwnd here
10141                                                  */
10142                                                 ;
10143                                         }
10144                                 }
10145                         }
10146                 }
10147
10148         }
10149         burst_cnt = 0;
10150         do {
10151                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10152                     &reason_code, 0, from_where,
10153                     &now, &now_filled, frag_point, so_locked);
10154                 if (error) {
10155                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10156                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10157                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10158                         }
10159                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10160                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10161                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10162                         }
10163                         break;
10164                 }
10165                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10166
10167                 tot_out += num_out;
10168                 burst_cnt++;
10169                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10170                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10171                         if (num_out == 0) {
10172                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10173                         }
10174                 }
10175                 if (nagle_on) {
10176                         /*
10177                          * When the Nagle algorithm is used, look at how
10178                          * much is unsent, then if its smaller than an MTU
10179                          * and we have data in flight we stop, except if we
10180                          * are handling a fragmented user message.
10181                          */
10182                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10183                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10184                             (stcb->asoc.total_flight > 0)) {
10185 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10186                                 break;
10187                         }
10188                 }
10189                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10190                     TAILQ_EMPTY(&asoc->send_queue) &&
10191                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10192                         /* Nothing left to send */
10193                         break;
10194                 }
10195                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10196                         /* Nothing left to send */
10197                         break;
10198                 }
10199         } while (num_out &&
10200             ((asoc->max_burst == 0) ||
10201             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10202             (burst_cnt < asoc->max_burst)));
10203
10204         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10205                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10206                         SCTP_STAT_INCR(sctps_maxburstqueued);
10207                         asoc->burst_limit_applied = 1;
10208                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10209                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10210                         }
10211                 } else {
10212                         asoc->burst_limit_applied = 0;
10213                 }
10214         }
10215         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10216                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10217         }
10218         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10219             tot_out);
10220
10221         /*-
10222          * Now we need to clean up the control chunk chain if a ECNE is on
10223          * it. It must be marked as UNSENT again so next call will continue
10224          * to send it until such time that we get a CWR, to remove it.
10225          */
10226         if (stcb->asoc.ecn_echo_cnt_onq)
10227                 sctp_fix_ecn_echo(asoc);
10228
10229         if (stcb->asoc.trigger_reset) {
10230                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10231                         goto do_it_again;
10232                 }
10233         }
10234         return;
10235 }
10236
10237
10238 int
10239 sctp_output(
10240     struct sctp_inpcb *inp,
10241     struct mbuf *m,
10242     struct sockaddr *addr,
10243     struct mbuf *control,
10244     struct thread *p,
10245     int flags)
10246 {
10247         if (inp == NULL) {
10248                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10249                 return (EINVAL);
10250         }
10251         if (inp->sctp_socket == NULL) {
10252                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10253                 return (EINVAL);
10254         }
10255         return (sctp_sosend(inp->sctp_socket,
10256             addr,
10257             (struct uio *)NULL,
10258             m,
10259             control,
10260             flags, p
10261             ));
10262 }
10263
10264 void
10265 send_forward_tsn(struct sctp_tcb *stcb,
10266     struct sctp_association *asoc)
10267 {
10268         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10269         struct sctp_forward_tsn_chunk *fwdtsn;
10270         struct sctp_strseq *strseq;
10271         struct sctp_strseq_mid *strseq_m;
10272         uint32_t advance_peer_ack_point;
10273         unsigned int cnt_of_space, i, ovh;
10274         unsigned int space_needed;
10275         unsigned int cnt_of_skipped = 0;
10276
10277         SCTP_TCB_LOCK_ASSERT(stcb);
10278         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10279                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10280                         /* mark it to unsent */
10281                         chk->sent = SCTP_DATAGRAM_UNSENT;
10282                         chk->snd_count = 0;
10283                         /* Do we correct its output location? */
10284                         if (chk->whoTo) {
10285                                 sctp_free_remote_addr(chk->whoTo);
10286                                 chk->whoTo = NULL;
10287                         }
10288                         goto sctp_fill_in_rest;
10289                 }
10290         }
10291         /* Ok if we reach here we must build one */
10292         sctp_alloc_a_chunk(stcb, chk);
10293         if (chk == NULL) {
10294                 return;
10295         }
10296         asoc->fwd_tsn_cnt++;
10297         chk->copy_by_ref = 0;
10298         /*
10299          * We don't do the old thing here since this is used not for on-wire
10300          * but to tell if we are sending a fwd-tsn by the stack during
10301          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10302          */
10303         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10304         chk->rec.chunk_id.can_take_data = 0;
10305         chk->flags = 0;
10306         chk->asoc = asoc;
10307         chk->whoTo = NULL;
10308         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10309         if (chk->data == NULL) {
10310                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10311                 return;
10312         }
10313         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10314         chk->sent = SCTP_DATAGRAM_UNSENT;
10315         chk->snd_count = 0;
10316         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10317         asoc->ctrl_queue_cnt++;
10318 sctp_fill_in_rest:
10319         /*-
10320          * Here we go through and fill out the part that deals with
10321          * stream/seq of the ones we skip.
10322          */
10323         SCTP_BUF_LEN(chk->data) = 0;
10324         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10325                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10326                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10327                         /* no more to look at */
10328                         break;
10329                 }
10330                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10331                         /* We don't report these */
10332                         continue;
10333                 }
10334                 cnt_of_skipped++;
10335         }
10336         if (asoc->idata_supported) {
10337                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10338                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10339         } else {
10340                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10341                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10342         }
10343         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10344
10345         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10346                 ovh = SCTP_MIN_OVERHEAD;
10347         } else {
10348                 ovh = SCTP_MIN_V4_OVERHEAD;
10349         }
10350         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10351                 /* trim to a mtu size */
10352                 cnt_of_space = asoc->smallest_mtu - ovh;
10353         }
10354         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10355                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10356                     0xff, 0, cnt_of_skipped,
10357                     asoc->advanced_peer_ack_point);
10358         }
10359         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10360         if (cnt_of_space < space_needed) {
10361                 /*-
10362                  * ok we must trim down the chunk by lowering the
10363                  * advance peer ack point.
10364                  */
10365                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10366                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10367                             0xff, 0xff, cnt_of_space,
10368                             space_needed);
10369                 }
10370                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10371                 if (asoc->idata_supported) {
10372                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10373                 } else {
10374                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10375                 }
10376                 /*-
10377                  * Go through and find the TSN that will be the one
10378                  * we report.
10379                  */
10380                 at = TAILQ_FIRST(&asoc->sent_queue);
10381                 if (at != NULL) {
10382                         for (i = 0; i < cnt_of_skipped; i++) {
10383                                 tp1 = TAILQ_NEXT(at, sctp_next);
10384                                 if (tp1 == NULL) {
10385                                         break;
10386                                 }
10387                                 at = tp1;
10388                         }
10389                 }
10390                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10391                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10392                             0xff, cnt_of_skipped, at->rec.data.tsn,
10393                             asoc->advanced_peer_ack_point);
10394                 }
10395                 last = at;
10396                 /*-
10397                  * last now points to last one I can report, update
10398                  * peer ack point
10399                  */
10400                 if (last) {
10401                         advance_peer_ack_point = last->rec.data.tsn;
10402                 }
10403                 if (asoc->idata_supported) {
10404                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10405                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10406                 } else {
10407                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10408                             cnt_of_skipped * sizeof(struct sctp_strseq);
10409                 }
10410         }
10411         chk->send_size = space_needed;
10412         /* Setup the chunk */
10413         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10414         fwdtsn->ch.chunk_length = htons(chk->send_size);
10415         fwdtsn->ch.chunk_flags = 0;
10416         if (asoc->idata_supported) {
10417                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10418         } else {
10419                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10420         }
10421         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10422         SCTP_BUF_LEN(chk->data) = chk->send_size;
10423         fwdtsn++;
10424         /*-
10425          * Move pointer to after the fwdtsn and transfer to the
10426          * strseq pointer.
10427          */
10428         if (asoc->idata_supported) {
10429                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10430                 strseq = NULL;
10431         } else {
10432                 strseq = (struct sctp_strseq *)fwdtsn;
10433                 strseq_m = NULL;
10434         }
10435         /*-
10436          * Now populate the strseq list. This is done blindly
10437          * without pulling out duplicate stream info. This is
10438          * inefficent but won't harm the process since the peer will
10439          * look at these in sequence and will thus release anything.
10440          * It could mean we exceed the PMTU and chop off some that
10441          * we could have included.. but this is unlikely (aka 1432/4
10442          * would mean 300+ stream seq's would have to be reported in
10443          * one FWD-TSN. With a bit of work we can later FIX this to
10444          * optimize and pull out duplicates.. but it does add more
10445          * overhead. So for now... not!
10446          */
10447         i = 0;
10448         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10449                 if (i >= cnt_of_skipped) {
10450                         break;
10451                 }
10452                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10453                         /* We don't report these */
10454                         continue;
10455                 }
10456                 if (at->rec.data.tsn == advance_peer_ack_point) {
10457                         at->rec.data.fwd_tsn_cnt = 0;
10458                 }
10459                 if (asoc->idata_supported) {
10460                         strseq_m->sid = htons(at->rec.data.sid);
10461                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10462                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10463                         } else {
10464                                 strseq_m->flags = 0;
10465                         }
10466                         strseq_m->mid = htonl(at->rec.data.mid);
10467                         strseq_m++;
10468                 } else {
10469                         strseq->sid = htons(at->rec.data.sid);
10470                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10471                         strseq++;
10472                 }
10473                 i++;
10474         }
10475         return;
10476 }
10477
10478 void
10479 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10480 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10481     SCTP_UNUSED
10482 #endif
10483 )
10484 {
10485         /*-
10486          * Queue up a SACK or NR-SACK in the control queue.
10487          * We must first check to see if a SACK or NR-SACK is
10488          * somehow on the control queue.
10489          * If so, we will take and and remove the old one.
10490          */
10491         struct sctp_association *asoc;
10492         struct sctp_tmit_chunk *chk, *a_chk;
10493         struct sctp_sack_chunk *sack;
10494         struct sctp_nr_sack_chunk *nr_sack;
10495         struct sctp_gap_ack_block *gap_descriptor;
10496         const struct sack_track *selector;
10497         int mergeable = 0;
10498         int offset;
10499         caddr_t limit;
10500         uint32_t *dup;
10501         int limit_reached = 0;
10502         unsigned int i, siz, j;
10503         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10504         int num_dups = 0;
10505         int space_req;
10506         uint32_t highest_tsn;
10507         uint8_t flags;
10508         uint8_t type;
10509         uint8_t tsn_map;
10510
10511         if (stcb->asoc.nrsack_supported == 1) {
10512                 type = SCTP_NR_SELECTIVE_ACK;
10513         } else {
10514                 type = SCTP_SELECTIVE_ACK;
10515         }
10516         a_chk = NULL;
10517         asoc = &stcb->asoc;
10518         SCTP_TCB_LOCK_ASSERT(stcb);
10519         if (asoc->last_data_chunk_from == NULL) {
10520                 /* Hmm we never received anything */
10521                 return;
10522         }
10523         sctp_slide_mapping_arrays(stcb);
10524         sctp_set_rwnd(stcb, asoc);
10525         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10526                 if (chk->rec.chunk_id.id == type) {
10527                         /* Hmm, found a sack already on queue, remove it */
10528                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10529                         asoc->ctrl_queue_cnt--;
10530                         a_chk = chk;
10531                         if (a_chk->data) {
10532                                 sctp_m_freem(a_chk->data);
10533                                 a_chk->data = NULL;
10534                         }
10535                         if (a_chk->whoTo) {
10536                                 sctp_free_remote_addr(a_chk->whoTo);
10537                                 a_chk->whoTo = NULL;
10538                         }
10539                         break;
10540                 }
10541         }
10542         if (a_chk == NULL) {
10543                 sctp_alloc_a_chunk(stcb, a_chk);
10544                 if (a_chk == NULL) {
10545                         /* No memory so we drop the idea, and set a timer */
10546                         if (stcb->asoc.delayed_ack) {
10547                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10548                                     stcb->sctp_ep, stcb, NULL,
10549                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10550                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10551                                     stcb->sctp_ep, stcb, NULL);
10552                         } else {
10553                                 stcb->asoc.send_sack = 1;
10554                         }
10555                         return;
10556                 }
10557                 a_chk->copy_by_ref = 0;
10558                 a_chk->rec.chunk_id.id = type;
10559                 a_chk->rec.chunk_id.can_take_data = 1;
10560         }
10561         /* Clear our pkt counts */
10562         asoc->data_pkts_seen = 0;
10563
10564         a_chk->flags = 0;
10565         a_chk->asoc = asoc;
10566         a_chk->snd_count = 0;
10567         a_chk->send_size = 0;   /* fill in later */
10568         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10569         a_chk->whoTo = NULL;
10570
10571         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10572                 /*-
10573                  * Ok, the destination for the SACK is unreachable, lets see if
10574                  * we can select an alternate to asoc->last_data_chunk_from
10575                  */
10576                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10577                 if (a_chk->whoTo == NULL) {
10578                         /* Nope, no alternate */
10579                         a_chk->whoTo = asoc->last_data_chunk_from;
10580                 }
10581         } else {
10582                 a_chk->whoTo = asoc->last_data_chunk_from;
10583         }
10584         if (a_chk->whoTo) {
10585                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10586         }
10587         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10588                 highest_tsn = asoc->highest_tsn_inside_map;
10589         } else {
10590                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10591         }
10592         if (highest_tsn == asoc->cumulative_tsn) {
10593                 /* no gaps */
10594                 if (type == SCTP_SELECTIVE_ACK) {
10595                         space_req = sizeof(struct sctp_sack_chunk);
10596                 } else {
10597                         space_req = sizeof(struct sctp_nr_sack_chunk);
10598                 }
10599         } else {
10600                 /* gaps get a cluster */
10601                 space_req = MCLBYTES;
10602         }
10603         /* Ok now lets formulate a MBUF with our sack */
10604         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10605         if ((a_chk->data == NULL) ||
10606             (a_chk->whoTo == NULL)) {
10607                 /* rats, no mbuf memory */
10608                 if (a_chk->data) {
10609                         /* was a problem with the destination */
10610                         sctp_m_freem(a_chk->data);
10611                         a_chk->data = NULL;
10612                 }
10613                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10614                 /* sa_ignore NO_NULL_CHK */
10615                 if (stcb->asoc.delayed_ack) {
10616                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10617                             stcb->sctp_ep, stcb, NULL,
10618                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10619                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10620                             stcb->sctp_ep, stcb, NULL);
10621                 } else {
10622                         stcb->asoc.send_sack = 1;
10623                 }
10624                 return;
10625         }
10626         /* ok, lets go through and fill it in */
10627         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10628         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10629         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10630                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10631         }
10632         limit = mtod(a_chk->data, caddr_t);
10633         limit += space;
10634
10635         flags = 0;
10636
10637         if ((asoc->sctp_cmt_on_off > 0) &&
10638             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10639                 /*-
10640                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10641                  * received, then set high bit to 1, else 0. Reset
10642                  * pkts_rcvd.
10643                  */
10644                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10645                 asoc->cmt_dac_pkts_rcvd = 0;
10646         }
10647 #ifdef SCTP_ASOCLOG_OF_TSNS
10648         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10649         stcb->asoc.cumack_log_atsnt++;
10650         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10651                 stcb->asoc.cumack_log_atsnt = 0;
10652         }
10653 #endif
10654         /* reset the readers interpretation */
10655         stcb->freed_by_sorcv_sincelast = 0;
10656
10657         if (type == SCTP_SELECTIVE_ACK) {
10658                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10659                 nr_sack = NULL;
10660                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10661                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10662                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10663                 } else {
10664                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10665                 }
10666         } else {
10667                 sack = NULL;
10668                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10669                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10670                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10671                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10672                 } else {
10673                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10674                 }
10675         }
10676
10677         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10678                 offset = 1;
10679         } else {
10680                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10681         }
10682         if (((type == SCTP_SELECTIVE_ACK) &&
10683             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10684             ((type == SCTP_NR_SELECTIVE_ACK) &&
10685             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10686                 /* we have a gap .. maybe */
10687                 for (i = 0; i < siz; i++) {
10688                         tsn_map = asoc->mapping_array[i];
10689                         if (type == SCTP_SELECTIVE_ACK) {
10690                                 tsn_map |= asoc->nr_mapping_array[i];
10691                         }
10692                         if (i == 0) {
10693                                 /*
10694                                  * Clear all bits corresponding to TSNs
10695                                  * smaller or equal to the cumulative TSN.
10696                                  */
10697                                 tsn_map &= (~0U << (1 - offset));
10698                         }
10699                         selector = &sack_array[tsn_map];
10700                         if (mergeable && selector->right_edge) {
10701                                 /*
10702                                  * Backup, left and right edges were ok to
10703                                  * merge.
10704                                  */
10705                                 num_gap_blocks--;
10706                                 gap_descriptor--;
10707                         }
10708                         if (selector->num_entries == 0)
10709                                 mergeable = 0;
10710                         else {
10711                                 for (j = 0; j < selector->num_entries; j++) {
10712                                         if (mergeable && selector->right_edge) {
10713                                                 /*
10714                                                  * do a merge by NOT setting
10715                                                  * the left side
10716                                                  */
10717                                                 mergeable = 0;
10718                                         } else {
10719                                                 /*
10720                                                  * no merge, set the left
10721                                                  * side
10722                                                  */
10723                                                 mergeable = 0;
10724                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10725                                         }
10726                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10727                                         num_gap_blocks++;
10728                                         gap_descriptor++;
10729                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10730                                                 /* no more room */
10731                                                 limit_reached = 1;
10732                                                 break;
10733                                         }
10734                                 }
10735                                 if (selector->left_edge) {
10736                                         mergeable = 1;
10737                                 }
10738                         }
10739                         if (limit_reached) {
10740                                 /* Reached the limit stop */
10741                                 break;
10742                         }
10743                         offset += 8;
10744                 }
10745         }
10746         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10747             (limit_reached == 0)) {
10748
10749                 mergeable = 0;
10750
10751                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10752                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10753                 } else {
10754                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10755                 }
10756
10757                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10758                         offset = 1;
10759                 } else {
10760                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10761                 }
10762                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10763                         /* we have a gap .. maybe */
10764                         for (i = 0; i < siz; i++) {
10765                                 tsn_map = asoc->nr_mapping_array[i];
10766                                 if (i == 0) {
10767                                         /*
10768                                          * Clear all bits corresponding to
10769                                          * TSNs smaller or equal to the
10770                                          * cumulative TSN.
10771                                          */
10772                                         tsn_map &= (~0U << (1 - offset));
10773                                 }
10774                                 selector = &sack_array[tsn_map];
10775                                 if (mergeable && selector->right_edge) {
10776                                         /*
10777                                          * Backup, left and right edges were
10778                                          * ok to merge.
10779                                          */
10780                                         num_nr_gap_blocks--;
10781                                         gap_descriptor--;
10782                                 }
10783                                 if (selector->num_entries == 0)
10784                                         mergeable = 0;
10785                                 else {
10786                                         for (j = 0; j < selector->num_entries; j++) {
10787                                                 if (mergeable && selector->right_edge) {
10788                                                         /*
10789                                                          * do a merge by NOT
10790                                                          * setting the left
10791                                                          * side
10792                                                          */
10793                                                         mergeable = 0;
10794                                                 } else {
10795                                                         /*
10796                                                          * no merge, set the
10797                                                          * left side
10798                                                          */
10799                                                         mergeable = 0;
10800                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10801                                                 }
10802                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10803                                                 num_nr_gap_blocks++;
10804                                                 gap_descriptor++;
10805                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10806                                                         /* no more room */
10807                                                         limit_reached = 1;
10808                                                         break;
10809                                                 }
10810                                         }
10811                                         if (selector->left_edge) {
10812                                                 mergeable = 1;
10813                                         }
10814                                 }
10815                                 if (limit_reached) {
10816                                         /* Reached the limit stop */
10817                                         break;
10818                                 }
10819                                 offset += 8;
10820                         }
10821                 }
10822         }
10823         /* now we must add any dups we are going to report. */
10824         if ((limit_reached == 0) && (asoc->numduptsns)) {
10825                 dup = (uint32_t *)gap_descriptor;
10826                 for (i = 0; i < asoc->numduptsns; i++) {
10827                         *dup = htonl(asoc->dup_tsns[i]);
10828                         dup++;
10829                         num_dups++;
10830                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10831                                 /* no more room */
10832                                 break;
10833                         }
10834                 }
10835                 asoc->numduptsns = 0;
10836         }
10837         /*
10838          * now that the chunk is prepared queue it to the control chunk
10839          * queue.
10840          */
10841         if (type == SCTP_SELECTIVE_ACK) {
10842                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10843                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10844                     num_dups * sizeof(int32_t));
10845                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10846                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10847                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10848                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10849                 sack->sack.num_dup_tsns = htons(num_dups);
10850                 sack->ch.chunk_type = type;
10851                 sack->ch.chunk_flags = flags;
10852                 sack->ch.chunk_length = htons(a_chk->send_size);
10853         } else {
10854                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10855                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10856                     num_dups * sizeof(int32_t));
10857                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10858                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10859                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10860                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10861                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10862                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10863                 nr_sack->nr_sack.reserved = 0;
10864                 nr_sack->ch.chunk_type = type;
10865                 nr_sack->ch.chunk_flags = flags;
10866                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10867         }
10868         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10869         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10870         asoc->ctrl_queue_cnt++;
10871         asoc->send_sack = 0;
10872         SCTP_STAT_INCR(sctps_sendsacks);
10873         return;
10874 }
10875
10876 void
10877 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10878 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10879     SCTP_UNUSED
10880 #endif
10881 )
10882 {
10883         struct mbuf *m_abort, *m, *m_last;
10884         struct mbuf *m_out, *m_end = NULL;
10885         struct sctp_abort_chunk *abort;
10886         struct sctp_auth_chunk *auth = NULL;
10887         struct sctp_nets *net;
10888         uint32_t vtag;
10889         uint32_t auth_offset = 0;
10890         int error;
10891         uint16_t cause_len, chunk_len, padding_len;
10892
10893         SCTP_TCB_LOCK_ASSERT(stcb);
10894         /*-
10895          * Add an AUTH chunk, if chunk requires it and save the offset into
10896          * the chain for AUTH
10897          */
10898         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10899             stcb->asoc.peer_auth_chunks)) {
10900                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10901                     stcb, SCTP_ABORT_ASSOCIATION);
10902                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10903         } else {
10904                 m_out = NULL;
10905         }
10906         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10907         if (m_abort == NULL) {
10908                 if (m_out) {
10909                         sctp_m_freem(m_out);
10910                 }
10911                 if (operr) {
10912                         sctp_m_freem(operr);
10913                 }
10914                 return;
10915         }
10916         /* link in any error */
10917         SCTP_BUF_NEXT(m_abort) = operr;
10918         cause_len = 0;
10919         m_last = NULL;
10920         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10921                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10922                 if (SCTP_BUF_NEXT(m) == NULL) {
10923                         m_last = m;
10924                 }
10925         }
10926         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10927         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10928         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10929         if (m_out == NULL) {
10930                 /* NO Auth chunk prepended, so reserve space in front */
10931                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10932                 m_out = m_abort;
10933         } else {
10934                 /* Put AUTH chunk at the front of the chain */
10935                 SCTP_BUF_NEXT(m_end) = m_abort;
10936         }
10937         if (stcb->asoc.alternate) {
10938                 net = stcb->asoc.alternate;
10939         } else {
10940                 net = stcb->asoc.primary_destination;
10941         }
10942         /* Fill in the ABORT chunk header. */
10943         abort = mtod(m_abort, struct sctp_abort_chunk *);
10944         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10945         if (stcb->asoc.peer_vtag == 0) {
10946                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10947                 vtag = stcb->asoc.my_vtag;
10948                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10949         } else {
10950                 vtag = stcb->asoc.peer_vtag;
10951                 abort->ch.chunk_flags = 0;
10952         }
10953         abort->ch.chunk_length = htons(chunk_len);
10954         /* Add padding, if necessary. */
10955         if (padding_len > 0) {
10956                 if ((m_last == NULL) ||
10957                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10958                         sctp_m_freem(m_out);
10959                         return;
10960                 }
10961         }
10962         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10963             (struct sockaddr *)&net->ro._l_addr,
10964             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10965             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10966             stcb->asoc.primary_destination->port, NULL,
10967             0, 0,
10968             so_locked))) {
10969                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10970                 if (error == ENOBUFS) {
10971                         stcb->asoc.ifp_had_enobuf = 1;
10972                         SCTP_STAT_INCR(sctps_lowlevelerr);
10973                 }
10974         } else {
10975                 stcb->asoc.ifp_had_enobuf = 0;
10976         }
10977         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10978 }
10979
10980 void
10981 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10982     struct sctp_nets *net,
10983     int reflect_vtag)
10984 {
10985         /* formulate and SEND a SHUTDOWN-COMPLETE */
10986         struct mbuf *m_shutdown_comp;
10987         struct sctp_shutdown_complete_chunk *shutdown_complete;
10988         uint32_t vtag;
10989         int error;
10990         uint8_t flags;
10991
10992         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10993         if (m_shutdown_comp == NULL) {
10994                 /* no mbuf's */
10995                 return;
10996         }
10997         if (reflect_vtag) {
10998                 flags = SCTP_HAD_NO_TCB;
10999                 vtag = stcb->asoc.my_vtag;
11000         } else {
11001                 flags = 0;
11002                 vtag = stcb->asoc.peer_vtag;
11003         }
11004         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11005         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11006         shutdown_complete->ch.chunk_flags = flags;
11007         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11008         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11009         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11010             (struct sockaddr *)&net->ro._l_addr,
11011             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11012             stcb->sctp_ep->sctp_lport, stcb->rport,
11013             htonl(vtag),
11014             net->port, NULL,
11015             0, 0,
11016             SCTP_SO_NOT_LOCKED))) {
11017                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11018                 if (error == ENOBUFS) {
11019                         stcb->asoc.ifp_had_enobuf = 1;
11020                         SCTP_STAT_INCR(sctps_lowlevelerr);
11021                 }
11022         } else {
11023                 stcb->asoc.ifp_had_enobuf = 0;
11024         }
11025         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11026         return;
11027 }
11028
11029 static void
11030 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11031     struct sctphdr *sh, uint32_t vtag,
11032     uint8_t type, struct mbuf *cause,
11033     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11034     uint32_t vrf_id, uint16_t port)
11035 {
11036         struct mbuf *o_pak;
11037         struct mbuf *mout;
11038         struct sctphdr *shout;
11039         struct sctp_chunkhdr *ch;
11040 #if defined(INET) || defined(INET6)
11041         struct udphdr *udp;
11042         int ret;
11043 #endif
11044         int len, cause_len, padding_len;
11045 #ifdef INET
11046         struct sockaddr_in *src_sin, *dst_sin;
11047         struct ip *ip;
11048 #endif
11049 #ifdef INET6
11050         struct sockaddr_in6 *src_sin6, *dst_sin6;
11051         struct ip6_hdr *ip6;
11052 #endif
11053
11054         /* Compute the length of the cause and add final padding. */
11055         cause_len = 0;
11056         if (cause != NULL) {
11057                 struct mbuf *m_at, *m_last = NULL;
11058
11059                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11060                         if (SCTP_BUF_NEXT(m_at) == NULL)
11061                                 m_last = m_at;
11062                         cause_len += SCTP_BUF_LEN(m_at);
11063                 }
11064                 padding_len = cause_len % 4;
11065                 if (padding_len != 0) {
11066                         padding_len = 4 - padding_len;
11067                 }
11068                 if (padding_len != 0) {
11069                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11070                                 sctp_m_freem(cause);
11071                                 return;
11072                         }
11073                 }
11074         } else {
11075                 padding_len = 0;
11076         }
11077         /* Get an mbuf for the header. */
11078         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11079         switch (dst->sa_family) {
11080 #ifdef INET
11081         case AF_INET:
11082                 len += sizeof(struct ip);
11083                 break;
11084 #endif
11085 #ifdef INET6
11086         case AF_INET6:
11087                 len += sizeof(struct ip6_hdr);
11088                 break;
11089 #endif
11090         default:
11091                 break;
11092         }
11093 #if defined(INET) || defined(INET6)
11094         if (port) {
11095                 len += sizeof(struct udphdr);
11096         }
11097 #endif
11098         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11099         if (mout == NULL) {
11100                 if (cause) {
11101                         sctp_m_freem(cause);
11102                 }
11103                 return;
11104         }
11105         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11106         SCTP_BUF_LEN(mout) = len;
11107         SCTP_BUF_NEXT(mout) = cause;
11108         M_SETFIB(mout, fibnum);
11109         mout->m_pkthdr.flowid = mflowid;
11110         M_HASHTYPE_SET(mout, mflowtype);
11111 #ifdef INET
11112         ip = NULL;
11113 #endif
11114 #ifdef INET6
11115         ip6 = NULL;
11116 #endif
11117         switch (dst->sa_family) {
11118 #ifdef INET
11119         case AF_INET:
11120                 src_sin = (struct sockaddr_in *)src;
11121                 dst_sin = (struct sockaddr_in *)dst;
11122                 ip = mtod(mout, struct ip *);
11123                 ip->ip_v = IPVERSION;
11124                 ip->ip_hl = (sizeof(struct ip) >> 2);
11125                 ip->ip_tos = 0;
11126                 ip->ip_off = htons(IP_DF);
11127                 ip_fillid(ip);
11128                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11129                 if (port) {
11130                         ip->ip_p = IPPROTO_UDP;
11131                 } else {
11132                         ip->ip_p = IPPROTO_SCTP;
11133                 }
11134                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11135                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11136                 ip->ip_sum = 0;
11137                 len = sizeof(struct ip);
11138                 shout = (struct sctphdr *)((caddr_t)ip + len);
11139                 break;
11140 #endif
11141 #ifdef INET6
11142         case AF_INET6:
11143                 src_sin6 = (struct sockaddr_in6 *)src;
11144                 dst_sin6 = (struct sockaddr_in6 *)dst;
11145                 ip6 = mtod(mout, struct ip6_hdr *);
11146                 ip6->ip6_flow = htonl(0x60000000);
11147                 if (V_ip6_auto_flowlabel) {
11148                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11149                 }
11150                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11151                 if (port) {
11152                         ip6->ip6_nxt = IPPROTO_UDP;
11153                 } else {
11154                         ip6->ip6_nxt = IPPROTO_SCTP;
11155                 }
11156                 ip6->ip6_src = dst_sin6->sin6_addr;
11157                 ip6->ip6_dst = src_sin6->sin6_addr;
11158                 len = sizeof(struct ip6_hdr);
11159                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11160                 break;
11161 #endif
11162         default:
11163                 len = 0;
11164                 shout = mtod(mout, struct sctphdr *);
11165                 break;
11166         }
11167 #if defined(INET) || defined(INET6)
11168         if (port) {
11169                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11170                         sctp_m_freem(mout);
11171                         return;
11172                 }
11173                 udp = (struct udphdr *)shout;
11174                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11175                 udp->uh_dport = port;
11176                 udp->uh_sum = 0;
11177                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11178                     sizeof(struct sctphdr) +
11179                     sizeof(struct sctp_chunkhdr) +
11180                     cause_len + padding_len));
11181                 len += sizeof(struct udphdr);
11182                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11183         } else {
11184                 udp = NULL;
11185         }
11186 #endif
11187         shout->src_port = sh->dest_port;
11188         shout->dest_port = sh->src_port;
11189         shout->checksum = 0;
11190         if (vtag) {
11191                 shout->v_tag = htonl(vtag);
11192         } else {
11193                 shout->v_tag = sh->v_tag;
11194         }
11195         len += sizeof(struct sctphdr);
11196         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11197         ch->chunk_type = type;
11198         if (vtag) {
11199                 ch->chunk_flags = 0;
11200         } else {
11201                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11202         }
11203         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11204         len += sizeof(struct sctp_chunkhdr);
11205         len += cause_len + padding_len;
11206
11207         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11208                 sctp_m_freem(mout);
11209                 return;
11210         }
11211         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11212         switch (dst->sa_family) {
11213 #ifdef INET
11214         case AF_INET:
11215                 if (port) {
11216                         if (V_udp_cksum) {
11217                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11218                         } else {
11219                                 udp->uh_sum = 0;
11220                         }
11221                 }
11222                 ip->ip_len = htons(len);
11223                 if (port) {
11224 #if defined(SCTP_WITH_NO_CSUM)
11225                         SCTP_STAT_INCR(sctps_sendnocrc);
11226 #else
11227                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11228                         SCTP_STAT_INCR(sctps_sendswcrc);
11229 #endif
11230                         if (V_udp_cksum) {
11231                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11232                         }
11233                 } else {
11234 #if defined(SCTP_WITH_NO_CSUM)
11235                         SCTP_STAT_INCR(sctps_sendnocrc);
11236 #else
11237                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11238                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11239                         SCTP_STAT_INCR(sctps_sendhwcrc);
11240 #endif
11241                 }
11242 #ifdef SCTP_PACKET_LOGGING
11243                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11244                         sctp_packet_log(o_pak);
11245                 }
11246 #endif
11247                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11248                 break;
11249 #endif
11250 #ifdef INET6
11251         case AF_INET6:
11252                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11253                 if (port) {
11254 #if defined(SCTP_WITH_NO_CSUM)
11255                         SCTP_STAT_INCR(sctps_sendnocrc);
11256 #else
11257                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11258                         SCTP_STAT_INCR(sctps_sendswcrc);
11259 #endif
11260                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11261                                 udp->uh_sum = 0xffff;
11262                         }
11263                 } else {
11264 #if defined(SCTP_WITH_NO_CSUM)
11265                         SCTP_STAT_INCR(sctps_sendnocrc);
11266 #else
11267                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11268                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11269                         SCTP_STAT_INCR(sctps_sendhwcrc);
11270 #endif
11271                 }
11272 #ifdef SCTP_PACKET_LOGGING
11273                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11274                         sctp_packet_log(o_pak);
11275                 }
11276 #endif
11277                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11278                 break;
11279 #endif
11280         default:
11281                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11282                     dst->sa_family);
11283                 sctp_m_freem(mout);
11284                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11285                 return;
11286         }
11287         SCTP_STAT_INCR(sctps_sendpackets);
11288         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11289         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11290         return;
11291 }
11292
11293 void
11294 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11295     struct sctphdr *sh,
11296     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11297     uint32_t vrf_id, uint16_t port)
11298 {
11299         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11300             mflowtype, mflowid, fibnum,
11301             vrf_id, port);
11302 }
11303
11304 void
11305 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11306 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11307     SCTP_UNUSED
11308 #endif
11309 )
11310 {
11311         struct sctp_tmit_chunk *chk;
11312         struct sctp_heartbeat_chunk *hb;
11313         struct timeval now;
11314
11315         SCTP_TCB_LOCK_ASSERT(stcb);
11316         if (net == NULL) {
11317                 return;
11318         }
11319         (void)SCTP_GETTIME_TIMEVAL(&now);
11320         switch (net->ro._l_addr.sa.sa_family) {
11321 #ifdef INET
11322         case AF_INET:
11323                 break;
11324 #endif
11325 #ifdef INET6
11326         case AF_INET6:
11327                 break;
11328 #endif
11329         default:
11330                 return;
11331         }
11332         sctp_alloc_a_chunk(stcb, chk);
11333         if (chk == NULL) {
11334                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11335                 return;
11336         }
11337         chk->copy_by_ref = 0;
11338         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11339         chk->rec.chunk_id.can_take_data = 1;
11340         chk->flags = 0;
11341         chk->asoc = &stcb->asoc;
11342         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11343
11344         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11345         if (chk->data == NULL) {
11346                 sctp_free_a_chunk(stcb, chk, so_locked);
11347                 return;
11348         }
11349         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11350         SCTP_BUF_LEN(chk->data) = chk->send_size;
11351         chk->sent = SCTP_DATAGRAM_UNSENT;
11352         chk->snd_count = 0;
11353         chk->whoTo = net;
11354         atomic_add_int(&chk->whoTo->ref_count, 1);
11355         /* Now we have a mbuf that we can fill in with the details */
11356         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11357         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11358         /* fill out chunk header */
11359         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11360         hb->ch.chunk_flags = 0;
11361         hb->ch.chunk_length = htons(chk->send_size);
11362         /* Fill out hb parameter */
11363         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11364         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11365         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11366         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11367         /* Did our user request this one, put it in */
11368         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11369         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11370         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11371                 /*
11372                  * we only take from the entropy pool if the address is not
11373                  * confirmed.
11374                  */
11375                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11376                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11377         } else {
11378                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11379                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11380         }
11381         switch (net->ro._l_addr.sa.sa_family) {
11382 #ifdef INET
11383         case AF_INET:
11384                 memcpy(hb->heartbeat.hb_info.address,
11385                     &net->ro._l_addr.sin.sin_addr,
11386                     sizeof(net->ro._l_addr.sin.sin_addr));
11387                 break;
11388 #endif
11389 #ifdef INET6
11390         case AF_INET6:
11391                 memcpy(hb->heartbeat.hb_info.address,
11392                     &net->ro._l_addr.sin6.sin6_addr,
11393                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11394                 break;
11395 #endif
11396         default:
11397                 if (chk->data) {
11398                         sctp_m_freem(chk->data);
11399                         chk->data = NULL;
11400                 }
11401                 sctp_free_a_chunk(stcb, chk, so_locked);
11402                 return;
11403                 break;
11404         }
11405         net->hb_responded = 0;
11406         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11407         stcb->asoc.ctrl_queue_cnt++;
11408         SCTP_STAT_INCR(sctps_sendheartbeat);
11409         return;
11410 }
11411
11412 void
11413 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11414     uint32_t high_tsn)
11415 {
11416         struct sctp_association *asoc;
11417         struct sctp_ecne_chunk *ecne;
11418         struct sctp_tmit_chunk *chk;
11419
11420         if (net == NULL) {
11421                 return;
11422         }
11423         asoc = &stcb->asoc;
11424         SCTP_TCB_LOCK_ASSERT(stcb);
11425         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11426                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11427                         /* found a previous ECN_ECHO update it if needed */
11428                         uint32_t cnt, ctsn;
11429
11430                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11431                         ctsn = ntohl(ecne->tsn);
11432                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11433                                 ecne->tsn = htonl(high_tsn);
11434                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11435                         }
11436                         cnt = ntohl(ecne->num_pkts_since_cwr);
11437                         cnt++;
11438                         ecne->num_pkts_since_cwr = htonl(cnt);
11439                         return;
11440                 }
11441         }
11442         /* nope could not find one to update so we must build one */
11443         sctp_alloc_a_chunk(stcb, chk);
11444         if (chk == NULL) {
11445                 return;
11446         }
11447         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11448         chk->copy_by_ref = 0;
11449         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11450         chk->rec.chunk_id.can_take_data = 0;
11451         chk->flags = 0;
11452         chk->asoc = &stcb->asoc;
11453         chk->send_size = sizeof(struct sctp_ecne_chunk);
11454         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11455         if (chk->data == NULL) {
11456                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11457                 return;
11458         }
11459         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11460         SCTP_BUF_LEN(chk->data) = chk->send_size;
11461         chk->sent = SCTP_DATAGRAM_UNSENT;
11462         chk->snd_count = 0;
11463         chk->whoTo = net;
11464         atomic_add_int(&chk->whoTo->ref_count, 1);
11465
11466         stcb->asoc.ecn_echo_cnt_onq++;
11467         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11468         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11469         ecne->ch.chunk_flags = 0;
11470         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11471         ecne->tsn = htonl(high_tsn);
11472         ecne->num_pkts_since_cwr = htonl(1);
11473         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11474         asoc->ctrl_queue_cnt++;
11475 }
11476
11477 void
11478 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11479     struct mbuf *m, int len, int iphlen, int bad_crc)
11480 {
11481         struct sctp_association *asoc;
11482         struct sctp_pktdrop_chunk *drp;
11483         struct sctp_tmit_chunk *chk;
11484         uint8_t *datap;
11485         int was_trunc = 0;
11486         int fullsz = 0;
11487         long spc;
11488         int offset;
11489         struct sctp_chunkhdr *ch, chunk_buf;
11490         unsigned int chk_length;
11491
11492         if (!stcb) {
11493                 return;
11494         }
11495         asoc = &stcb->asoc;
11496         SCTP_TCB_LOCK_ASSERT(stcb);
11497         if (asoc->pktdrop_supported == 0) {
11498                 /*-
11499                  * peer must declare support before I send one.
11500                  */
11501                 return;
11502         }
11503         if (stcb->sctp_socket == NULL) {
11504                 return;
11505         }
11506         sctp_alloc_a_chunk(stcb, chk);
11507         if (chk == NULL) {
11508                 return;
11509         }
11510         chk->copy_by_ref = 0;
11511         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11512         chk->rec.chunk_id.can_take_data = 1;
11513         chk->flags = 0;
11514         len -= iphlen;
11515         chk->send_size = len;
11516         /* Validate that we do not have an ABORT in here. */
11517         offset = iphlen + sizeof(struct sctphdr);
11518         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11519             sizeof(*ch), (uint8_t *)&chunk_buf);
11520         while (ch != NULL) {
11521                 chk_length = ntohs(ch->chunk_length);
11522                 if (chk_length < sizeof(*ch)) {
11523                         /* break to abort land */
11524                         break;
11525                 }
11526                 switch (ch->chunk_type) {
11527                 case SCTP_PACKET_DROPPED:
11528                 case SCTP_ABORT_ASSOCIATION:
11529                 case SCTP_INITIATION_ACK:
11530                         /**
11531                          * We don't respond with an PKT-DROP to an ABORT
11532                          * or PKT-DROP. We also do not respond to an
11533                          * INIT-ACK, because we can't know if the initiation
11534                          * tag is correct or not.
11535                          */
11536                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11537                         return;
11538                 default:
11539                         break;
11540                 }
11541                 offset += SCTP_SIZE32(chk_length);
11542                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11543                     sizeof(*ch), (uint8_t *)&chunk_buf);
11544         }
11545
11546         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11547             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11548                 /*
11549                  * only send 1 mtu worth, trim off the excess on the end.
11550                  */
11551                 fullsz = len;
11552                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11553                 was_trunc = 1;
11554         }
11555         chk->asoc = &stcb->asoc;
11556         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11557         if (chk->data == NULL) {
11558 jump_out:
11559                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11560                 return;
11561         }
11562         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11563         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11564         if (drp == NULL) {
11565                 sctp_m_freem(chk->data);
11566                 chk->data = NULL;
11567                 goto jump_out;
11568         }
11569         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11570             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11571         chk->book_size_scale = 0;
11572         if (was_trunc) {
11573                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11574                 drp->trunc_len = htons(fullsz);
11575                 /*
11576                  * Len is already adjusted to size minus overhead above take
11577                  * out the pkt_drop chunk itself from it.
11578                  */
11579                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11580                 len = chk->send_size;
11581         } else {
11582                 /* no truncation needed */
11583                 drp->ch.chunk_flags = 0;
11584                 drp->trunc_len = htons(0);
11585         }
11586         if (bad_crc) {
11587                 drp->ch.chunk_flags |= SCTP_BADCRC;
11588         }
11589         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11590         SCTP_BUF_LEN(chk->data) = chk->send_size;
11591         chk->sent = SCTP_DATAGRAM_UNSENT;
11592         chk->snd_count = 0;
11593         if (net) {
11594                 /* we should hit here */
11595                 chk->whoTo = net;
11596                 atomic_add_int(&chk->whoTo->ref_count, 1);
11597         } else {
11598                 chk->whoTo = NULL;
11599         }
11600         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11601         drp->ch.chunk_length = htons(chk->send_size);
11602         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11603         if (spc < 0) {
11604                 spc = 0;
11605         }
11606         drp->bottle_bw = htonl(spc);
11607         if (asoc->my_rwnd) {
11608                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11609                     asoc->size_on_all_streams +
11610                     asoc->my_rwnd_control_len +
11611                     stcb->sctp_socket->so_rcv.sb_cc);
11612         } else {
11613                 /*-
11614                  * If my rwnd is 0, possibly from mbuf depletion as well as
11615                  * space used, tell the peer there is NO space aka onq == bw
11616                  */
11617                 drp->current_onq = htonl(spc);
11618         }
11619         drp->reserved = 0;
11620         datap = drp->data;
11621         m_copydata(m, iphlen, len, (caddr_t)datap);
11622         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11623         asoc->ctrl_queue_cnt++;
11624 }
11625
11626 void
11627 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11628 {
11629         struct sctp_association *asoc;
11630         struct sctp_cwr_chunk *cwr;
11631         struct sctp_tmit_chunk *chk;
11632
11633         SCTP_TCB_LOCK_ASSERT(stcb);
11634         if (net == NULL) {
11635                 return;
11636         }
11637         asoc = &stcb->asoc;
11638         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11639                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11640                         /*
11641                          * found a previous CWR queued to same destination
11642                          * update it if needed
11643                          */
11644                         uint32_t ctsn;
11645
11646                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11647                         ctsn = ntohl(cwr->tsn);
11648                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11649                                 cwr->tsn = htonl(high_tsn);
11650                         }
11651                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11652                                 /* Make sure override is carried */
11653                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11654                         }
11655                         return;
11656                 }
11657         }
11658         sctp_alloc_a_chunk(stcb, chk);
11659         if (chk == NULL) {
11660                 return;
11661         }
11662         chk->copy_by_ref = 0;
11663         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11664         chk->rec.chunk_id.can_take_data = 1;
11665         chk->flags = 0;
11666         chk->asoc = &stcb->asoc;
11667         chk->send_size = sizeof(struct sctp_cwr_chunk);
11668         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11669         if (chk->data == NULL) {
11670                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11671                 return;
11672         }
11673         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11674         SCTP_BUF_LEN(chk->data) = chk->send_size;
11675         chk->sent = SCTP_DATAGRAM_UNSENT;
11676         chk->snd_count = 0;
11677         chk->whoTo = net;
11678         atomic_add_int(&chk->whoTo->ref_count, 1);
11679         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11680         cwr->ch.chunk_type = SCTP_ECN_CWR;
11681         cwr->ch.chunk_flags = override;
11682         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11683         cwr->tsn = htonl(high_tsn);
11684         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11685         asoc->ctrl_queue_cnt++;
11686 }
11687
11688 static int
11689 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11690     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11691 {
11692         uint16_t len, old_len, i;
11693         struct sctp_stream_reset_out_request *req_out;
11694         struct sctp_chunkhdr *ch;
11695         int at;
11696         int number_entries = 0;
11697
11698         ch = mtod(chk->data, struct sctp_chunkhdr *);
11699         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11700         /* get to new offset for the param. */
11701         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11702         /* now how long will this param be? */
11703         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11704                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11705                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11706                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11707                         number_entries++;
11708                 }
11709         }
11710         if (number_entries == 0) {
11711                 return (0);
11712         }
11713         if (number_entries == stcb->asoc.streamoutcnt) {
11714                 number_entries = 0;
11715         }
11716         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11717                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11718         }
11719         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11720         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11721         req_out->ph.param_length = htons(len);
11722         req_out->request_seq = htonl(seq);
11723         req_out->response_seq = htonl(resp_seq);
11724         req_out->send_reset_at_tsn = htonl(last_sent);
11725         at = 0;
11726         if (number_entries) {
11727                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11728                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11729                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11730                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11731                                 req_out->list_of_streams[at] = htons(i);
11732                                 at++;
11733                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11734                                 if (at >= number_entries) {
11735                                         break;
11736                                 }
11737                         }
11738                 }
11739         } else {
11740                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11741                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11742                 }
11743         }
11744         if (SCTP_SIZE32(len) > len) {
11745                 /*-
11746                  * Need to worry about the pad we may end up adding to the
11747                  * end. This is easy since the struct is either aligned to 4
11748                  * bytes or 2 bytes off.
11749                  */
11750                 req_out->list_of_streams[number_entries] = 0;
11751         }
11752         /* now fix the chunk length */
11753         ch->chunk_length = htons(len + old_len);
11754         chk->book_size = len + old_len;
11755         chk->book_size_scale = 0;
11756         chk->send_size = SCTP_SIZE32(chk->book_size);
11757         SCTP_BUF_LEN(chk->data) = chk->send_size;
11758         return (1);
11759 }
11760
11761 static void
11762 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11763     int number_entries, uint16_t *list,
11764     uint32_t seq)
11765 {
11766         uint16_t len, old_len, i;
11767         struct sctp_stream_reset_in_request *req_in;
11768         struct sctp_chunkhdr *ch;
11769
11770         ch = mtod(chk->data, struct sctp_chunkhdr *);
11771         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11772
11773         /* get to new offset for the param. */
11774         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11775         /* now how long will this param be? */
11776         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11777         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11778         req_in->ph.param_length = htons(len);
11779         req_in->request_seq = htonl(seq);
11780         if (number_entries) {
11781                 for (i = 0; i < number_entries; i++) {
11782                         req_in->list_of_streams[i] = htons(list[i]);
11783                 }
11784         }
11785         if (SCTP_SIZE32(len) > len) {
11786                 /*-
11787                  * Need to worry about the pad we may end up adding to the
11788                  * end. This is easy since the struct is either aligned to 4
11789                  * bytes or 2 bytes off.
11790                  */
11791                 req_in->list_of_streams[number_entries] = 0;
11792         }
11793         /* now fix the chunk length */
11794         ch->chunk_length = htons(len + old_len);
11795         chk->book_size = len + old_len;
11796         chk->book_size_scale = 0;
11797         chk->send_size = SCTP_SIZE32(chk->book_size);
11798         SCTP_BUF_LEN(chk->data) = chk->send_size;
11799         return;
11800 }
11801
11802 static void
11803 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11804     uint32_t seq)
11805 {
11806         uint16_t len, old_len;
11807         struct sctp_stream_reset_tsn_request *req_tsn;
11808         struct sctp_chunkhdr *ch;
11809
11810         ch = mtod(chk->data, struct sctp_chunkhdr *);
11811         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11812
11813         /* get to new offset for the param. */
11814         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11815         /* now how long will this param be? */
11816         len = sizeof(struct sctp_stream_reset_tsn_request);
11817         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11818         req_tsn->ph.param_length = htons(len);
11819         req_tsn->request_seq = htonl(seq);
11820
11821         /* now fix the chunk length */
11822         ch->chunk_length = htons(len + old_len);
11823         chk->send_size = len + old_len;
11824         chk->book_size = SCTP_SIZE32(chk->send_size);
11825         chk->book_size_scale = 0;
11826         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11827         return;
11828 }
11829
11830 void
11831 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11832     uint32_t resp_seq, uint32_t result)
11833 {
11834         uint16_t len, old_len;
11835         struct sctp_stream_reset_response *resp;
11836         struct sctp_chunkhdr *ch;
11837
11838         ch = mtod(chk->data, struct sctp_chunkhdr *);
11839         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11840
11841         /* get to new offset for the param. */
11842         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11843         /* now how long will this param be? */
11844         len = sizeof(struct sctp_stream_reset_response);
11845         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11846         resp->ph.param_length = htons(len);
11847         resp->response_seq = htonl(resp_seq);
11848         resp->result = ntohl(result);
11849
11850         /* now fix the chunk length */
11851         ch->chunk_length = htons(len + old_len);
11852         chk->book_size = len + old_len;
11853         chk->book_size_scale = 0;
11854         chk->send_size = SCTP_SIZE32(chk->book_size);
11855         SCTP_BUF_LEN(chk->data) = chk->send_size;
11856         return;
11857 }
11858
11859 void
11860 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11861     struct sctp_stream_reset_list *ent,
11862     int response)
11863 {
11864         struct sctp_association *asoc;
11865         struct sctp_tmit_chunk *chk;
11866         struct sctp_chunkhdr *ch;
11867
11868         asoc = &stcb->asoc;
11869
11870         /*
11871          * Reset our last reset action to the new one IP -> response
11872          * (PERFORMED probably). This assures that if we fail to send, a
11873          * retran from the peer will get the new response.
11874          */
11875         asoc->last_reset_action[0] = response;
11876         if (asoc->stream_reset_outstanding) {
11877                 return;
11878         }
11879         sctp_alloc_a_chunk(stcb, chk);
11880         if (chk == NULL) {
11881                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11882                 return;
11883         }
11884         chk->copy_by_ref = 0;
11885         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11886         chk->rec.chunk_id.can_take_data = 0;
11887         chk->flags = 0;
11888         chk->asoc = &stcb->asoc;
11889         chk->book_size = sizeof(struct sctp_chunkhdr);
11890         chk->send_size = SCTP_SIZE32(chk->book_size);
11891         chk->book_size_scale = 0;
11892         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11893         if (chk->data == NULL) {
11894                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11895                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11896                 return;
11897         }
11898         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11899         /* setup chunk parameters */
11900         chk->sent = SCTP_DATAGRAM_UNSENT;
11901         chk->snd_count = 0;
11902         if (stcb->asoc.alternate) {
11903                 chk->whoTo = stcb->asoc.alternate;
11904         } else {
11905                 chk->whoTo = stcb->asoc.primary_destination;
11906         }
11907         ch = mtod(chk->data, struct sctp_chunkhdr *);
11908         ch->chunk_type = SCTP_STREAM_RESET;
11909         ch->chunk_flags = 0;
11910         ch->chunk_length = htons(chk->book_size);
11911         atomic_add_int(&chk->whoTo->ref_count, 1);
11912         SCTP_BUF_LEN(chk->data) = chk->send_size;
11913         sctp_add_stream_reset_result(chk, ent->seq, response);
11914         /* insert the chunk for sending */
11915         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11916             chk,
11917             sctp_next);
11918         asoc->ctrl_queue_cnt++;
11919 }
11920
11921 void
11922 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11923     uint32_t resp_seq, uint32_t result,
11924     uint32_t send_una, uint32_t recv_next)
11925 {
11926         uint16_t len, old_len;
11927         struct sctp_stream_reset_response_tsn *resp;
11928         struct sctp_chunkhdr *ch;
11929
11930         ch = mtod(chk->data, struct sctp_chunkhdr *);
11931         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11932
11933         /* get to new offset for the param. */
11934         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11935         /* now how long will this param be? */
11936         len = sizeof(struct sctp_stream_reset_response_tsn);
11937         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11938         resp->ph.param_length = htons(len);
11939         resp->response_seq = htonl(resp_seq);
11940         resp->result = htonl(result);
11941         resp->senders_next_tsn = htonl(send_una);
11942         resp->receivers_next_tsn = htonl(recv_next);
11943
11944         /* now fix the chunk length */
11945         ch->chunk_length = htons(len + old_len);
11946         chk->book_size = len + old_len;
11947         chk->send_size = SCTP_SIZE32(chk->book_size);
11948         chk->book_size_scale = 0;
11949         SCTP_BUF_LEN(chk->data) = chk->send_size;
11950         return;
11951 }
11952
11953 static void
11954 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11955     uint32_t seq,
11956     uint16_t adding)
11957 {
11958         uint16_t len, old_len;
11959         struct sctp_chunkhdr *ch;
11960         struct sctp_stream_reset_add_strm *addstr;
11961
11962         ch = mtod(chk->data, struct sctp_chunkhdr *);
11963         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11964
11965         /* get to new offset for the param. */
11966         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11967         /* now how long will this param be? */
11968         len = sizeof(struct sctp_stream_reset_add_strm);
11969
11970         /* Fill it out. */
11971         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11972         addstr->ph.param_length = htons(len);
11973         addstr->request_seq = htonl(seq);
11974         addstr->number_of_streams = htons(adding);
11975         addstr->reserved = 0;
11976
11977         /* now fix the chunk length */
11978         ch->chunk_length = htons(len + old_len);
11979         chk->send_size = len + old_len;
11980         chk->book_size = SCTP_SIZE32(chk->send_size);
11981         chk->book_size_scale = 0;
11982         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11983         return;
11984 }
11985
11986 static void
11987 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11988     uint32_t seq,
11989     uint16_t adding)
11990 {
11991         uint16_t len, old_len;
11992         struct sctp_chunkhdr *ch;
11993         struct sctp_stream_reset_add_strm *addstr;
11994
11995         ch = mtod(chk->data, struct sctp_chunkhdr *);
11996         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11997
11998         /* get to new offset for the param. */
11999         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12000         /* now how long will this param be? */
12001         len = sizeof(struct sctp_stream_reset_add_strm);
12002         /* Fill it out. */
12003         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12004         addstr->ph.param_length = htons(len);
12005         addstr->request_seq = htonl(seq);
12006         addstr->number_of_streams = htons(adding);
12007         addstr->reserved = 0;
12008
12009         /* now fix the chunk length */
12010         ch->chunk_length = htons(len + old_len);
12011         chk->send_size = len + old_len;
12012         chk->book_size = SCTP_SIZE32(chk->send_size);
12013         chk->book_size_scale = 0;
12014         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12015         return;
12016 }
12017
12018 int
12019 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12020 {
12021         struct sctp_association *asoc;
12022         struct sctp_tmit_chunk *chk;
12023         struct sctp_chunkhdr *ch;
12024         uint32_t seq;
12025
12026         asoc = &stcb->asoc;
12027         asoc->trigger_reset = 0;
12028         if (asoc->stream_reset_outstanding) {
12029                 return (EALREADY);
12030         }
12031         sctp_alloc_a_chunk(stcb, chk);
12032         if (chk == NULL) {
12033                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12034                 return (ENOMEM);
12035         }
12036         chk->copy_by_ref = 0;
12037         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12038         chk->rec.chunk_id.can_take_data = 0;
12039         chk->flags = 0;
12040         chk->asoc = &stcb->asoc;
12041         chk->book_size = sizeof(struct sctp_chunkhdr);
12042         chk->send_size = SCTP_SIZE32(chk->book_size);
12043         chk->book_size_scale = 0;
12044         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12045         if (chk->data == NULL) {
12046                 sctp_free_a_chunk(stcb, chk, so_locked);
12047                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12048                 return (ENOMEM);
12049         }
12050         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12051
12052         /* setup chunk parameters */
12053         chk->sent = SCTP_DATAGRAM_UNSENT;
12054         chk->snd_count = 0;
12055         if (stcb->asoc.alternate) {
12056                 chk->whoTo = stcb->asoc.alternate;
12057         } else {
12058                 chk->whoTo = stcb->asoc.primary_destination;
12059         }
12060         ch = mtod(chk->data, struct sctp_chunkhdr *);
12061         ch->chunk_type = SCTP_STREAM_RESET;
12062         ch->chunk_flags = 0;
12063         ch->chunk_length = htons(chk->book_size);
12064         atomic_add_int(&chk->whoTo->ref_count, 1);
12065         SCTP_BUF_LEN(chk->data) = chk->send_size;
12066         seq = stcb->asoc.str_reset_seq_out;
12067         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12068                 seq++;
12069                 asoc->stream_reset_outstanding++;
12070         } else {
12071                 m_freem(chk->data);
12072                 chk->data = NULL;
12073                 sctp_free_a_chunk(stcb, chk, so_locked);
12074                 return (ENOENT);
12075         }
12076         asoc->str_reset = chk;
12077         /* insert the chunk for sending */
12078         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12079             chk,
12080             sctp_next);
12081         asoc->ctrl_queue_cnt++;
12082
12083         if (stcb->asoc.send_sack) {
12084                 sctp_send_sack(stcb, so_locked);
12085         }
12086         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12087         return (0);
12088 }
12089
12090 int
12091 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12092     uint16_t number_entries, uint16_t *list,
12093     uint8_t send_in_req,
12094     uint8_t send_tsn_req,
12095     uint8_t add_stream,
12096     uint16_t adding_o,
12097     uint16_t adding_i, uint8_t peer_asked)
12098 {
12099         struct sctp_association *asoc;
12100         struct sctp_tmit_chunk *chk;
12101         struct sctp_chunkhdr *ch;
12102         int can_send_out_req = 0;
12103         uint32_t seq;
12104
12105         asoc = &stcb->asoc;
12106         if (asoc->stream_reset_outstanding) {
12107                 /*-
12108                  * Already one pending, must get ACK back to clear the flag.
12109                  */
12110                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12111                 return (EBUSY);
12112         }
12113         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12114             (add_stream == 0)) {
12115                 /* nothing to do */
12116                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12117                 return (EINVAL);
12118         }
12119         if (send_tsn_req && send_in_req) {
12120                 /* error, can't do that */
12121                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12122                 return (EINVAL);
12123         } else if (send_in_req) {
12124                 can_send_out_req = 1;
12125         }
12126         if (number_entries > (MCLBYTES -
12127             SCTP_MIN_OVERHEAD -
12128             sizeof(struct sctp_chunkhdr) -
12129             sizeof(struct sctp_stream_reset_out_request)) /
12130             sizeof(uint16_t)) {
12131                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12132                 return (ENOMEM);
12133         }
12134         sctp_alloc_a_chunk(stcb, chk);
12135         if (chk == NULL) {
12136                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12137                 return (ENOMEM);
12138         }
12139         chk->copy_by_ref = 0;
12140         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12141         chk->rec.chunk_id.can_take_data = 0;
12142         chk->flags = 0;
12143         chk->asoc = &stcb->asoc;
12144         chk->book_size = sizeof(struct sctp_chunkhdr);
12145         chk->send_size = SCTP_SIZE32(chk->book_size);
12146         chk->book_size_scale = 0;
12147
12148         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12149         if (chk->data == NULL) {
12150                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12151                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12152                 return (ENOMEM);
12153         }
12154         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12155
12156         /* setup chunk parameters */
12157         chk->sent = SCTP_DATAGRAM_UNSENT;
12158         chk->snd_count = 0;
12159         if (stcb->asoc.alternate) {
12160                 chk->whoTo = stcb->asoc.alternate;
12161         } else {
12162                 chk->whoTo = stcb->asoc.primary_destination;
12163         }
12164         atomic_add_int(&chk->whoTo->ref_count, 1);
12165         ch = mtod(chk->data, struct sctp_chunkhdr *);
12166         ch->chunk_type = SCTP_STREAM_RESET;
12167         ch->chunk_flags = 0;
12168         ch->chunk_length = htons(chk->book_size);
12169         SCTP_BUF_LEN(chk->data) = chk->send_size;
12170
12171         seq = stcb->asoc.str_reset_seq_out;
12172         if (can_send_out_req) {
12173                 int ret;
12174
12175                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12176                 if (ret) {
12177                         seq++;
12178                         asoc->stream_reset_outstanding++;
12179                 }
12180         }
12181         if ((add_stream & 1) &&
12182             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12183                 /* Need to allocate more */
12184                 struct sctp_stream_out *oldstream;
12185                 struct sctp_stream_queue_pending *sp, *nsp;
12186                 int i;
12187 #if defined(SCTP_DETAILED_STR_STATS)
12188                 int j;
12189 #endif
12190
12191                 oldstream = stcb->asoc.strmout;
12192                 /* get some more */
12193                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12194                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12195                     SCTP_M_STRMO);
12196                 if (stcb->asoc.strmout == NULL) {
12197                         uint8_t x;
12198
12199                         stcb->asoc.strmout = oldstream;
12200                         /* Turn off the bit */
12201                         x = add_stream & 0xfe;
12202                         add_stream = x;
12203                         goto skip_stuff;
12204                 }
12205                 /*
12206                  * Ok now we proceed with copying the old out stuff and
12207                  * initializing the new stuff.
12208                  */
12209                 SCTP_TCB_SEND_LOCK(stcb);
12210                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12211                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12212                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12213                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12214                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12215                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12216                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12217                         stcb->asoc.strmout[i].sid = i;
12218                         stcb->asoc.strmout[i].state = oldstream[i].state;
12219                         /* FIX ME FIX ME */
12220                         /*
12221                          * This should be a SS_COPY operation FIX ME STREAM
12222                          * SCHEDULER EXPERT
12223                          */
12224                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12225                         /* now anything on those queues? */
12226                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12227                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12228                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12229                         }
12230
12231                 }
12232                 /* now the new streams */
12233                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12234                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12235                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12236                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12237 #if defined(SCTP_DETAILED_STR_STATS)
12238                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12239                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12240                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12241                         }
12242 #else
12243                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12244                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12245 #endif
12246                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12247                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12248                         stcb->asoc.strmout[i].sid = i;
12249                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12250                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12251                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12252                 }
12253                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12254                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12255                 SCTP_TCB_SEND_UNLOCK(stcb);
12256         }
12257 skip_stuff:
12258         if ((add_stream & 1) && (adding_o > 0)) {
12259                 asoc->strm_pending_add_size = adding_o;
12260                 asoc->peer_req_out = peer_asked;
12261                 sctp_add_an_out_stream(chk, seq, adding_o);
12262                 seq++;
12263                 asoc->stream_reset_outstanding++;
12264         }
12265         if ((add_stream & 2) && (adding_i > 0)) {
12266                 sctp_add_an_in_stream(chk, seq, adding_i);
12267                 seq++;
12268                 asoc->stream_reset_outstanding++;
12269         }
12270         if (send_in_req) {
12271                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12272                 seq++;
12273                 asoc->stream_reset_outstanding++;
12274         }
12275         if (send_tsn_req) {
12276                 sctp_add_stream_reset_tsn(chk, seq);
12277                 asoc->stream_reset_outstanding++;
12278         }
12279         asoc->str_reset = chk;
12280         /* insert the chunk for sending */
12281         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12282             chk,
12283             sctp_next);
12284         asoc->ctrl_queue_cnt++;
12285         if (stcb->asoc.send_sack) {
12286                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12287         }
12288         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12289         return (0);
12290 }
12291
12292 void
12293 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12294     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12295     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12296     uint32_t vrf_id, uint16_t port)
12297 {
12298         /* Don't respond to an ABORT with an ABORT. */
12299         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12300                 if (cause)
12301                         sctp_m_freem(cause);
12302                 return;
12303         }
12304         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12305             mflowtype, mflowid, fibnum,
12306             vrf_id, port);
12307         return;
12308 }
12309
12310 void
12311 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12312     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12313     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12314     uint32_t vrf_id, uint16_t port)
12315 {
12316         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12317             mflowtype, mflowid, fibnum,
12318             vrf_id, port);
12319         return;
12320 }
12321
12322 static struct mbuf *
12323 sctp_copy_resume(struct uio *uio,
12324     int max_send_len,
12325     int user_marks_eor,
12326     int *error,
12327     uint32_t *sndout,
12328     struct mbuf **new_tail)
12329 {
12330         struct mbuf *m;
12331
12332         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12333             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12334         if (m == NULL) {
12335                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12336                 *error = ENOBUFS;
12337         } else {
12338                 *sndout = m_length(m, NULL);
12339                 *new_tail = m_last(m);
12340         }
12341         return (m);
12342 }
12343
12344 static int
12345 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12346     struct uio *uio,
12347     int resv_upfront)
12348 {
12349         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12350             resv_upfront, 0);
12351         if (sp->data == NULL) {
12352                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12353                 return (ENOBUFS);
12354         }
12355         sp->tail_mbuf = m_last(sp->data);
12356         return (0);
12357 }
12358
12359
12360
12361 static struct sctp_stream_queue_pending *
12362 sctp_copy_it_in(struct sctp_tcb *stcb,
12363     struct sctp_association *asoc,
12364     struct sctp_sndrcvinfo *srcv,
12365     struct uio *uio,
12366     struct sctp_nets *net,
12367     int max_send_len,
12368     int user_marks_eor,
12369     int *error)
12370 {
12371         /*-
12372          * This routine must be very careful in its work. Protocol
12373          * processing is up and running so care must be taken to spl...()
12374          * when you need to do something that may effect the stcb/asoc. The
12375          * sb is locked however. When data is copied the protocol processing
12376          * should be enabled since this is a slower operation...
12377          */
12378         struct sctp_stream_queue_pending *sp = NULL;
12379         int resv_in_first;
12380
12381         *error = 0;
12382         /* Now can we send this? */
12383         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12384             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12385             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12386             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12387                 /* got data while shutting down */
12388                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12389                 *error = ECONNRESET;
12390                 goto out_now;
12391         }
12392         sctp_alloc_a_strmoq(stcb, sp);
12393         if (sp == NULL) {
12394                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12395                 *error = ENOMEM;
12396                 goto out_now;
12397         }
12398         sp->act_flags = 0;
12399         sp->sender_all_done = 0;
12400         sp->sinfo_flags = srcv->sinfo_flags;
12401         sp->timetolive = srcv->sinfo_timetolive;
12402         sp->ppid = srcv->sinfo_ppid;
12403         sp->context = srcv->sinfo_context;
12404         sp->fsn = 0;
12405         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12406
12407         sp->sid = srcv->sinfo_stream;
12408         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12409         if ((sp->length == (uint32_t)uio->uio_resid) &&
12410             ((user_marks_eor == 0) ||
12411             (srcv->sinfo_flags & SCTP_EOF) ||
12412             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12413                 sp->msg_is_complete = 1;
12414         } else {
12415                 sp->msg_is_complete = 0;
12416         }
12417         sp->sender_all_done = 0;
12418         sp->some_taken = 0;
12419         sp->put_last_out = 0;
12420         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12421         sp->data = sp->tail_mbuf = NULL;
12422         if (sp->length == 0) {
12423                 goto skip_copy;
12424         }
12425         if (srcv->sinfo_keynumber_valid) {
12426                 sp->auth_keyid = srcv->sinfo_keynumber;
12427         } else {
12428                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12429         }
12430         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12431                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12432                 sp->holds_key_ref = 1;
12433         }
12434         *error = sctp_copy_one(sp, uio, resv_in_first);
12435 skip_copy:
12436         if (*error) {
12437                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12438                 sp = NULL;
12439         } else {
12440                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12441                         sp->net = net;
12442                         atomic_add_int(&sp->net->ref_count, 1);
12443                 } else {
12444                         sp->net = NULL;
12445                 }
12446                 sctp_set_prsctp_policy(sp);
12447         }
12448 out_now:
12449         return (sp);
12450 }
12451
12452
12453 int
12454 sctp_sosend(struct socket *so,
12455     struct sockaddr *addr,
12456     struct uio *uio,
12457     struct mbuf *top,
12458     struct mbuf *control,
12459     int flags,
12460     struct thread *p
12461 )
12462 {
12463         int error, use_sndinfo = 0;
12464         struct sctp_sndrcvinfo sndrcvninfo;
12465         struct sockaddr *addr_to_use;
12466 #if defined(INET) && defined(INET6)
12467         struct sockaddr_in sin;
12468 #endif
12469
12470         if (control) {
12471                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12472                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12473                     sizeof(sndrcvninfo))) {
12474                         /* got one */
12475                         use_sndinfo = 1;
12476                 }
12477         }
12478         addr_to_use = addr;
12479 #if defined(INET) && defined(INET6)
12480         if ((addr) && (addr->sa_family == AF_INET6)) {
12481                 struct sockaddr_in6 *sin6;
12482
12483                 sin6 = (struct sockaddr_in6 *)addr;
12484                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12485                         in6_sin6_2_sin(&sin, sin6);
12486                         addr_to_use = (struct sockaddr *)&sin;
12487                 }
12488         }
12489 #endif
12490         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12491             control,
12492             flags,
12493             use_sndinfo ? &sndrcvninfo : NULL
12494             ,p
12495             );
12496         return (error);
12497 }
12498
12499
12500 int
12501 sctp_lower_sosend(struct socket *so,
12502     struct sockaddr *addr,
12503     struct uio *uio,
12504     struct mbuf *i_pak,
12505     struct mbuf *control,
12506     int flags,
12507     struct sctp_sndrcvinfo *srcv
12508     ,
12509     struct thread *p
12510 )
12511 {
12512         unsigned int sndlen = 0, max_len;
12513         int error, len;
12514         struct mbuf *top = NULL;
12515         int queue_only = 0, queue_only_for_init = 0;
12516         int free_cnt_applied = 0;
12517         int un_sent;
12518         int now_filled = 0;
12519         unsigned int inqueue_bytes = 0;
12520         struct sctp_block_entry be;
12521         struct sctp_inpcb *inp;
12522         struct sctp_tcb *stcb = NULL;
12523         struct timeval now;
12524         struct sctp_nets *net;
12525         struct sctp_association *asoc;
12526         struct sctp_inpcb *t_inp;
12527         int user_marks_eor;
12528         int create_lock_applied = 0;
12529         int nagle_applies = 0;
12530         int some_on_control = 0;
12531         int got_all_of_the_send = 0;
12532         int hold_tcblock = 0;
12533         int non_blocking = 0;
12534         uint32_t local_add_more, local_soresv = 0;
12535         uint16_t port;
12536         uint16_t sinfo_flags;
12537         sctp_assoc_t sinfo_assoc_id;
12538
12539         error = 0;
12540         net = NULL;
12541         stcb = NULL;
12542         asoc = NULL;
12543
12544         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12545         if (inp == NULL) {
12546                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12547                 error = EINVAL;
12548                 if (i_pak) {
12549                         SCTP_RELEASE_PKT(i_pak);
12550                 }
12551                 return (error);
12552         }
12553         if ((uio == NULL) && (i_pak == NULL)) {
12554                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12555                 return (EINVAL);
12556         }
12557         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12558         atomic_add_int(&inp->total_sends, 1);
12559         if (uio) {
12560                 if (uio->uio_resid < 0) {
12561                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12562                         return (EINVAL);
12563                 }
12564                 sndlen = (unsigned int)uio->uio_resid;
12565         } else {
12566                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12567                 sndlen = SCTP_HEADER_LEN(i_pak);
12568         }
12569         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12570             (void *)addr,
12571             sndlen);
12572         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12573             SCTP_IS_LISTENING(inp)) {
12574                 /* The listener can NOT send */
12575                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12576                 error = ENOTCONN;
12577                 goto out_unlocked;
12578         }
12579         /**
12580          * Pre-screen address, if one is given the sin-len
12581          * must be set correctly!
12582          */
12583         if (addr) {
12584                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12585
12586                 switch (raddr->sa.sa_family) {
12587 #ifdef INET
12588                 case AF_INET:
12589                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12590                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12591                                 error = EINVAL;
12592                                 goto out_unlocked;
12593                         }
12594                         port = raddr->sin.sin_port;
12595                         break;
12596 #endif
12597 #ifdef INET6
12598                 case AF_INET6:
12599                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12600                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12601                                 error = EINVAL;
12602                                 goto out_unlocked;
12603                         }
12604                         port = raddr->sin6.sin6_port;
12605                         break;
12606 #endif
12607                 default:
12608                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12609                         error = EAFNOSUPPORT;
12610                         goto out_unlocked;
12611                 }
12612         } else
12613                 port = 0;
12614
12615         if (srcv) {
12616                 sinfo_flags = srcv->sinfo_flags;
12617                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12618                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12619                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12620                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12621                         error = EINVAL;
12622                         goto out_unlocked;
12623                 }
12624                 if (srcv->sinfo_flags)
12625                         SCTP_STAT_INCR(sctps_sends_with_flags);
12626         } else {
12627                 sinfo_flags = inp->def_send.sinfo_flags;
12628                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12629         }
12630         if (sinfo_flags & SCTP_SENDALL) {
12631                 /* its a sendall */
12632                 error = sctp_sendall(inp, uio, top, srcv);
12633                 top = NULL;
12634                 goto out_unlocked;
12635         }
12636         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12637                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12638                 error = EINVAL;
12639                 goto out_unlocked;
12640         }
12641         /* now we must find the assoc */
12642         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12643             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12644                 SCTP_INP_RLOCK(inp);
12645                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12646                 if (stcb) {
12647                         SCTP_TCB_LOCK(stcb);
12648                         hold_tcblock = 1;
12649                 }
12650                 SCTP_INP_RUNLOCK(inp);
12651         } else if (sinfo_assoc_id) {
12652                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12653                 if (stcb != NULL) {
12654                         hold_tcblock = 1;
12655                 }
12656         } else if (addr) {
12657                 /*-
12658                  * Since we did not use findep we must
12659                  * increment it, and if we don't find a tcb
12660                  * decrement it.
12661                  */
12662                 SCTP_INP_WLOCK(inp);
12663                 SCTP_INP_INCR_REF(inp);
12664                 SCTP_INP_WUNLOCK(inp);
12665                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12666                 if (stcb == NULL) {
12667                         SCTP_INP_WLOCK(inp);
12668                         SCTP_INP_DECR_REF(inp);
12669                         SCTP_INP_WUNLOCK(inp);
12670                 } else {
12671                         hold_tcblock = 1;
12672                 }
12673         }
12674         if ((stcb == NULL) && (addr)) {
12675                 /* Possible implicit send? */
12676                 SCTP_ASOC_CREATE_LOCK(inp);
12677                 create_lock_applied = 1;
12678                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12679                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12680                         /* Should I really unlock ? */
12681                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12682                         error = EINVAL;
12683                         goto out_unlocked;
12684
12685                 }
12686                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12687                     (addr->sa_family == AF_INET6)) {
12688                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12689                         error = EINVAL;
12690                         goto out_unlocked;
12691                 }
12692                 SCTP_INP_WLOCK(inp);
12693                 SCTP_INP_INCR_REF(inp);
12694                 SCTP_INP_WUNLOCK(inp);
12695                 /* With the lock applied look again */
12696                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12697                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12698                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12699                 }
12700                 if (stcb == NULL) {
12701                         SCTP_INP_WLOCK(inp);
12702                         SCTP_INP_DECR_REF(inp);
12703                         SCTP_INP_WUNLOCK(inp);
12704                 } else {
12705                         hold_tcblock = 1;
12706                 }
12707                 if (error) {
12708                         goto out_unlocked;
12709                 }
12710                 if (t_inp != inp) {
12711                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12712                         error = ENOTCONN;
12713                         goto out_unlocked;
12714                 }
12715         }
12716         if (stcb == NULL) {
12717                 if (addr == NULL) {
12718                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12719                         error = ENOENT;
12720                         goto out_unlocked;
12721                 } else {
12722                         /* We must go ahead and start the INIT process */
12723                         uint32_t vrf_id;
12724
12725                         if ((sinfo_flags & SCTP_ABORT) ||
12726                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12727                                 /*-
12728                                  * User asks to abort a non-existant assoc,
12729                                  * or EOF a non-existant assoc with no data
12730                                  */
12731                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12732                                 error = ENOENT;
12733                                 goto out_unlocked;
12734                         }
12735                         /* get an asoc/stcb struct */
12736                         vrf_id = inp->def_vrf_id;
12737 #ifdef INVARIANTS
12738                         if (create_lock_applied == 0) {
12739                                 panic("Error, should hold create lock and I don't?");
12740                         }
12741 #endif
12742                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12743                             inp->sctp_ep.pre_open_stream_count,
12744                             inp->sctp_ep.port,
12745                             p);
12746                         if (stcb == NULL) {
12747                                 /* Error is setup for us in the call */
12748                                 goto out_unlocked;
12749                         }
12750                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12751                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12752                                 /*
12753                                  * Set the connected flag so we can queue
12754                                  * data
12755                                  */
12756                                 soisconnecting(so);
12757                         }
12758                         hold_tcblock = 1;
12759                         if (create_lock_applied) {
12760                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12761                                 create_lock_applied = 0;
12762                         } else {
12763                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12764                         }
12765                         /*
12766                          * Turn on queue only flag to prevent data from
12767                          * being sent
12768                          */
12769                         queue_only = 1;
12770                         asoc = &stcb->asoc;
12771                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12772                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12773
12774                         /* initialize authentication params for the assoc */
12775                         sctp_initialize_auth_params(inp, stcb);
12776
12777                         if (control) {
12778                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12779                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12780                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12781                                         hold_tcblock = 0;
12782                                         stcb = NULL;
12783                                         goto out_unlocked;
12784                                 }
12785                         }
12786                         /* out with the INIT */
12787                         queue_only_for_init = 1;
12788                         /*-
12789                          * we may want to dig in after this call and adjust the MTU
12790                          * value. It defaulted to 1500 (constant) but the ro
12791                          * structure may now have an update and thus we may need to
12792                          * change it BEFORE we append the message.
12793                          */
12794                 }
12795         } else
12796                 asoc = &stcb->asoc;
12797         if (srcv == NULL)
12798                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12799         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12800                 if (addr)
12801                         net = sctp_findnet(stcb, addr);
12802                 else
12803                         net = NULL;
12804                 if ((net == NULL) ||
12805                     ((port != 0) && (port != stcb->rport))) {
12806                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12807                         error = EINVAL;
12808                         goto out_unlocked;
12809                 }
12810         } else {
12811                 if (stcb->asoc.alternate) {
12812                         net = stcb->asoc.alternate;
12813                 } else {
12814                         net = stcb->asoc.primary_destination;
12815                 }
12816         }
12817         atomic_add_int(&stcb->total_sends, 1);
12818         /* Keep the stcb from being freed under our feet */
12819         atomic_add_int(&asoc->refcnt, 1);
12820         free_cnt_applied = 1;
12821
12822         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12823                 if (sndlen > asoc->smallest_mtu) {
12824                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12825                         error = EMSGSIZE;
12826                         goto out_unlocked;
12827                 }
12828         }
12829         if (SCTP_SO_IS_NBIO(so)
12830             || (flags & MSG_NBIO)
12831             ) {
12832                 non_blocking = 1;
12833         }
12834         /* would we block? */
12835         if (non_blocking) {
12836                 uint32_t amount;
12837
12838                 if (hold_tcblock == 0) {
12839                         SCTP_TCB_LOCK(stcb);
12840                         hold_tcblock = 1;
12841                 }
12842                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12843                 if (user_marks_eor == 0) {
12844                         amount = sndlen;
12845                 } else {
12846                         amount = 1;
12847                 }
12848                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12849                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12850                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12851                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12852                                 error = EMSGSIZE;
12853                         else
12854                                 error = EWOULDBLOCK;
12855                         goto out_unlocked;
12856                 }
12857                 stcb->asoc.sb_send_resv += sndlen;
12858                 SCTP_TCB_UNLOCK(stcb);
12859                 hold_tcblock = 0;
12860         } else {
12861                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12862         }
12863         local_soresv = sndlen;
12864         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12865                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12866                 error = ECONNRESET;
12867                 goto out_unlocked;
12868         }
12869         if (create_lock_applied) {
12870                 SCTP_ASOC_CREATE_UNLOCK(inp);
12871                 create_lock_applied = 0;
12872         }
12873         /* Is the stream no. valid? */
12874         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12875                 /* Invalid stream number */
12876                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12877                 error = EINVAL;
12878                 goto out_unlocked;
12879         }
12880         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12881             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12882                 /*
12883                  * Can't queue any data while stream reset is underway.
12884                  */
12885                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12886                         error = EAGAIN;
12887                 } else {
12888                         error = EINVAL;
12889                 }
12890                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12891                 goto out_unlocked;
12892         }
12893         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12894             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12895                 queue_only = 1;
12896         }
12897         /* we are now done with all control */
12898         if (control) {
12899                 sctp_m_freem(control);
12900                 control = NULL;
12901         }
12902         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12903             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12904             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12905             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12906                 if (srcv->sinfo_flags & SCTP_ABORT) {
12907                         ;
12908                 } else {
12909                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12910                         error = ECONNRESET;
12911                         goto out_unlocked;
12912                 }
12913         }
12914         /* Ok, we will attempt a msgsnd :> */
12915         if (p) {
12916                 p->td_ru.ru_msgsnd++;
12917         }
12918         /* Are we aborting? */
12919         if (srcv->sinfo_flags & SCTP_ABORT) {
12920                 struct mbuf *mm;
12921                 int tot_demand, tot_out = 0, max_out;
12922
12923                 SCTP_STAT_INCR(sctps_sends_with_abort);
12924                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12925                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12926                         /* It has to be up before we abort */
12927                         /* how big is the user initiated abort? */
12928                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12929                         error = EINVAL;
12930                         goto out;
12931                 }
12932                 if (hold_tcblock) {
12933                         SCTP_TCB_UNLOCK(stcb);
12934                         hold_tcblock = 0;
12935                 }
12936                 if (top) {
12937                         struct mbuf *cntm = NULL;
12938
12939                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12940                         if (sndlen != 0) {
12941                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12942                                         tot_out += SCTP_BUF_LEN(cntm);
12943                                 }
12944                         }
12945                 } else {
12946                         /* Must fit in a MTU */
12947                         tot_out = sndlen;
12948                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12949                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12950                                 /* To big */
12951                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12952                                 error = EMSGSIZE;
12953                                 goto out;
12954                         }
12955                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12956                 }
12957                 if (mm == NULL) {
12958                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12959                         error = ENOMEM;
12960                         goto out;
12961                 }
12962                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12963                 max_out -= sizeof(struct sctp_abort_msg);
12964                 if (tot_out > max_out) {
12965                         tot_out = max_out;
12966                 }
12967                 if (mm) {
12968                         struct sctp_paramhdr *ph;
12969
12970                         /* now move forward the data pointer */
12971                         ph = mtod(mm, struct sctp_paramhdr *);
12972                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12973                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12974                         ph++;
12975                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12976                         if (top == NULL) {
12977                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12978                                 if (error) {
12979                                         /*-
12980                                          * Here if we can't get his data we
12981                                          * still abort we just don't get to
12982                                          * send the users note :-0
12983                                          */
12984                                         sctp_m_freem(mm);
12985                                         mm = NULL;
12986                                 }
12987                         } else {
12988                                 if (sndlen != 0) {
12989                                         SCTP_BUF_NEXT(mm) = top;
12990                                 }
12991                         }
12992                 }
12993                 if (hold_tcblock == 0) {
12994                         SCTP_TCB_LOCK(stcb);
12995                 }
12996                 atomic_add_int(&stcb->asoc.refcnt, -1);
12997                 free_cnt_applied = 0;
12998                 /* release this lock, otherwise we hang on ourselves */
12999                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13000                 /* now relock the stcb so everything is sane */
13001                 hold_tcblock = 0;
13002                 stcb = NULL;
13003                 /*
13004                  * In this case top is already chained to mm avoid double
13005                  * free, since we free it below if top != NULL and driver
13006                  * would free it after sending the packet out
13007                  */
13008                 if (sndlen != 0) {
13009                         top = NULL;
13010                 }
13011                 goto out_unlocked;
13012         }
13013         /* Calculate the maximum we can send */
13014         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13015         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13016                 if (non_blocking) {
13017                         /* we already checked for non-blocking above. */
13018                         max_len = sndlen;
13019                 } else {
13020                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13021                 }
13022         } else {
13023                 max_len = 0;
13024         }
13025         if (hold_tcblock) {
13026                 SCTP_TCB_UNLOCK(stcb);
13027                 hold_tcblock = 0;
13028         }
13029         if (asoc->strmout == NULL) {
13030                 /* huh? software error */
13031                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13032                 error = EFAULT;
13033                 goto out_unlocked;
13034         }
13035         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13036         if ((user_marks_eor == 0) &&
13037             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13038                 /* It will NEVER fit */
13039                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13040                 error = EMSGSIZE;
13041                 goto out_unlocked;
13042         }
13043         if ((uio == NULL) && user_marks_eor) {
13044                 /*-
13045                  * We do not support eeor mode for
13046                  * sending with mbuf chains (like sendfile).
13047                  */
13048                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13049                 error = EINVAL;
13050                 goto out_unlocked;
13051         }
13052         if (user_marks_eor) {
13053                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13054         } else {
13055                 /*-
13056                  * For non-eeor the whole message must fit in
13057                  * the socket send buffer.
13058                  */
13059                 local_add_more = sndlen;
13060         }
13061         len = 0;
13062         if (non_blocking) {
13063                 goto skip_preblock;
13064         }
13065         if (((max_len <= local_add_more) &&
13066             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13067             (max_len == 0) ||
13068             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13069                 /* No room right now ! */
13070                 SOCKBUF_LOCK(&so->so_snd);
13071                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13072                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13073                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13074                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13075                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13076                             inqueue_bytes,
13077                             local_add_more,
13078                             stcb->asoc.stream_queue_cnt,
13079                             stcb->asoc.chunks_on_out_queue,
13080                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13081                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13082                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13083                         }
13084                         be.error = 0;
13085                         stcb->block_entry = &be;
13086                         error = sbwait(&so->so_snd);
13087                         stcb->block_entry = NULL;
13088                         if (error || so->so_error || be.error) {
13089                                 if (error == 0) {
13090                                         if (so->so_error)
13091                                                 error = so->so_error;
13092                                         if (be.error) {
13093                                                 error = be.error;
13094                                         }
13095                                 }
13096                                 SOCKBUF_UNLOCK(&so->so_snd);
13097                                 goto out_unlocked;
13098                         }
13099                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13100                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13101                                     asoc, stcb->asoc.total_output_queue_size);
13102                         }
13103                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13104                                 SOCKBUF_UNLOCK(&so->so_snd);
13105                                 goto out_unlocked;
13106                         }
13107                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13108                 }
13109                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13110                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13111                 } else {
13112                         max_len = 0;
13113                 }
13114                 SOCKBUF_UNLOCK(&so->so_snd);
13115         }
13116 skip_preblock:
13117         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13118                 goto out_unlocked;
13119         }
13120         /*
13121          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13122          * case NOTE: uio will be null when top/mbuf is passed
13123          */
13124         if (sndlen == 0) {
13125                 if (srcv->sinfo_flags & SCTP_EOF) {
13126                         got_all_of_the_send = 1;
13127                         goto dataless_eof;
13128                 } else {
13129                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13130                         error = EINVAL;
13131                         goto out;
13132                 }
13133         }
13134         if (top == NULL) {
13135                 struct sctp_stream_queue_pending *sp;
13136                 struct sctp_stream_out *strm;
13137                 uint32_t sndout;
13138
13139                 SCTP_TCB_SEND_LOCK(stcb);
13140                 if ((asoc->stream_locked) &&
13141                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13142                         SCTP_TCB_SEND_UNLOCK(stcb);
13143                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13144                         error = EINVAL;
13145                         goto out;
13146                 }
13147                 SCTP_TCB_SEND_UNLOCK(stcb);
13148
13149                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13150                 if (strm->last_msg_incomplete == 0) {
13151         do_a_copy_in:
13152                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13153                         if (error) {
13154                                 goto out;
13155                         }
13156                         SCTP_TCB_SEND_LOCK(stcb);
13157                         if (sp->msg_is_complete) {
13158                                 strm->last_msg_incomplete = 0;
13159                                 asoc->stream_locked = 0;
13160                         } else {
13161                                 /*
13162                                  * Just got locked to this guy in case of an
13163                                  * interrupt.
13164                                  */
13165                                 strm->last_msg_incomplete = 1;
13166                                 if (stcb->asoc.idata_supported == 0) {
13167                                         asoc->stream_locked = 1;
13168                                         asoc->stream_locked_on = srcv->sinfo_stream;
13169                                 }
13170                                 sp->sender_all_done = 0;
13171                         }
13172                         sctp_snd_sb_alloc(stcb, sp->length);
13173                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13174                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13175                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13176                         }
13177                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13178                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13179                         SCTP_TCB_SEND_UNLOCK(stcb);
13180                 } else {
13181                         SCTP_TCB_SEND_LOCK(stcb);
13182                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13183                         SCTP_TCB_SEND_UNLOCK(stcb);
13184                         if (sp == NULL) {
13185                                 /* ???? Huh ??? last msg is gone */
13186 #ifdef INVARIANTS
13187                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13188 #else
13189                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13190                                 strm->last_msg_incomplete = 0;
13191 #endif
13192                                 goto do_a_copy_in;
13193
13194                         }
13195                 }
13196                 while (uio->uio_resid > 0) {
13197                         /* How much room do we have? */
13198                         struct mbuf *new_tail, *mm;
13199
13200                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13201                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13202                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13203                         else
13204                                 max_len = 0;
13205
13206                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13207                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13208                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13209                                 sndout = 0;
13210                                 new_tail = NULL;
13211                                 if (hold_tcblock) {
13212                                         SCTP_TCB_UNLOCK(stcb);
13213                                         hold_tcblock = 0;
13214                                 }
13215                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13216                                 if ((mm == NULL) || error) {
13217                                         if (mm) {
13218                                                 sctp_m_freem(mm);
13219                                         }
13220                                         goto out;
13221                                 }
13222                                 /* Update the mbuf and count */
13223                                 SCTP_TCB_SEND_LOCK(stcb);
13224                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13225                                         /*
13226                                          * we need to get out. Peer probably
13227                                          * aborted.
13228                                          */
13229                                         sctp_m_freem(mm);
13230                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13231                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13232                                                 error = ECONNRESET;
13233                                         }
13234                                         SCTP_TCB_SEND_UNLOCK(stcb);
13235                                         goto out;
13236                                 }
13237                                 if (sp->tail_mbuf) {
13238                                         /* tack it to the end */
13239                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13240                                         sp->tail_mbuf = new_tail;
13241                                 } else {
13242                                         /* A stolen mbuf */
13243                                         sp->data = mm;
13244                                         sp->tail_mbuf = new_tail;
13245                                 }
13246                                 sctp_snd_sb_alloc(stcb, sndout);
13247                                 atomic_add_int(&sp->length, sndout);
13248                                 len += sndout;
13249                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13250                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13251                                 }
13252                                 /* Did we reach EOR? */
13253                                 if ((uio->uio_resid == 0) &&
13254                                     ((user_marks_eor == 0) ||
13255                                     (srcv->sinfo_flags & SCTP_EOF) ||
13256                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13257                                         sp->msg_is_complete = 1;
13258                                 } else {
13259                                         sp->msg_is_complete = 0;
13260                                 }
13261                                 SCTP_TCB_SEND_UNLOCK(stcb);
13262                         }
13263                         if (uio->uio_resid == 0) {
13264                                 /* got it all? */
13265                                 continue;
13266                         }
13267                         /* PR-SCTP? */
13268                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13269                                 /*
13270                                  * This is ugly but we must assure locking
13271                                  * order
13272                                  */
13273                                 if (hold_tcblock == 0) {
13274                                         SCTP_TCB_LOCK(stcb);
13275                                         hold_tcblock = 1;
13276                                 }
13277                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13278                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13279                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13280                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13281                                 else
13282                                         max_len = 0;
13283                                 if (max_len > 0) {
13284                                         continue;
13285                                 }
13286                                 SCTP_TCB_UNLOCK(stcb);
13287                                 hold_tcblock = 0;
13288                         }
13289                         /* wait for space now */
13290                         if (non_blocking) {
13291                                 /* Non-blocking io in place out */
13292                                 goto skip_out_eof;
13293                         }
13294                         /* What about the INIT, send it maybe */
13295                         if (queue_only_for_init) {
13296                                 if (hold_tcblock == 0) {
13297                                         SCTP_TCB_LOCK(stcb);
13298                                         hold_tcblock = 1;
13299                                 }
13300                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13301                                         /* a collision took us forward? */
13302                                         queue_only = 0;
13303                                 } else {
13304                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13305                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13306                                         queue_only = 1;
13307                                 }
13308                         }
13309                         if ((net->flight_size > net->cwnd) &&
13310                             (asoc->sctp_cmt_on_off == 0)) {
13311                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13312                                 queue_only = 1;
13313                         } else if (asoc->ifp_had_enobuf) {
13314                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13315                                 if (net->flight_size > (2 * net->mtu)) {
13316                                         queue_only = 1;
13317                                 }
13318                                 asoc->ifp_had_enobuf = 0;
13319                         }
13320                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13321                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13322                             (stcb->asoc.total_flight > 0) &&
13323                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13324                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13325
13326                                 /*-
13327                                  * Ok, Nagle is set on and we have data outstanding.
13328                                  * Don't send anything and let SACKs drive out the
13329                                  * data unless we have a "full" segment to send.
13330                                  */
13331                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13332                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13333                                 }
13334                                 SCTP_STAT_INCR(sctps_naglequeued);
13335                                 nagle_applies = 1;
13336                         } else {
13337                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13338                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13339                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13340                                 }
13341                                 SCTP_STAT_INCR(sctps_naglesent);
13342                                 nagle_applies = 0;
13343                         }
13344                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13345
13346                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13347                                     nagle_applies, un_sent);
13348                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13349                                     stcb->asoc.total_flight,
13350                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13351                         }
13352                         if (queue_only_for_init)
13353                                 queue_only_for_init = 0;
13354                         if ((queue_only == 0) && (nagle_applies == 0)) {
13355                                 /*-
13356                                  * need to start chunk output
13357                                  * before blocking.. note that if
13358                                  * a lock is already applied, then
13359                                  * the input via the net is happening
13360                                  * and I don't need to start output :-D
13361                                  */
13362                                 if (hold_tcblock == 0) {
13363                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13364                                                 hold_tcblock = 1;
13365                                                 sctp_chunk_output(inp,
13366                                                     stcb,
13367                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13368                                         }
13369                                 } else {
13370                                         sctp_chunk_output(inp,
13371                                             stcb,
13372                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13373                                 }
13374                                 if (hold_tcblock == 1) {
13375                                         SCTP_TCB_UNLOCK(stcb);
13376                                         hold_tcblock = 0;
13377                                 }
13378                         }
13379                         SOCKBUF_LOCK(&so->so_snd);
13380                         /*-
13381                          * This is a bit strange, but I think it will
13382                          * work. The total_output_queue_size is locked and
13383                          * protected by the TCB_LOCK, which we just released.
13384                          * There is a race that can occur between releasing it
13385                          * above, and me getting the socket lock, where sacks
13386                          * come in but we have not put the SB_WAIT on the
13387                          * so_snd buffer to get the wakeup. After the LOCK
13388                          * is applied the sack_processing will also need to
13389                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13390                          * once we have the socket buffer lock if we recheck the
13391                          * size we KNOW we will get to sleep safely with the
13392                          * wakeup flag in place.
13393                          */
13394                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13395                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13396                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13397                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13398                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13399                                             asoc, (size_t)uio->uio_resid);
13400                                 }
13401                                 be.error = 0;
13402                                 stcb->block_entry = &be;
13403                                 error = sbwait(&so->so_snd);
13404                                 stcb->block_entry = NULL;
13405
13406                                 if (error || so->so_error || be.error) {
13407                                         if (error == 0) {
13408                                                 if (so->so_error)
13409                                                         error = so->so_error;
13410                                                 if (be.error) {
13411                                                         error = be.error;
13412                                                 }
13413                                         }
13414                                         SOCKBUF_UNLOCK(&so->so_snd);
13415                                         goto out_unlocked;
13416                                 }
13417                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13418                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13419                                             asoc, stcb->asoc.total_output_queue_size);
13420                                 }
13421                         }
13422                         SOCKBUF_UNLOCK(&so->so_snd);
13423                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13424                                 goto out_unlocked;
13425                         }
13426                 }
13427                 SCTP_TCB_SEND_LOCK(stcb);
13428                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13429                         SCTP_TCB_SEND_UNLOCK(stcb);
13430                         goto out_unlocked;
13431                 }
13432                 if (sp) {
13433                         if (sp->msg_is_complete == 0) {
13434                                 strm->last_msg_incomplete = 1;
13435                                 if (stcb->asoc.idata_supported == 0) {
13436                                         asoc->stream_locked = 1;
13437                                         asoc->stream_locked_on = srcv->sinfo_stream;
13438                                 }
13439                         } else {
13440                                 sp->sender_all_done = 1;
13441                                 strm->last_msg_incomplete = 0;
13442                                 asoc->stream_locked = 0;
13443                         }
13444                 } else {
13445                         SCTP_PRINTF("Huh no sp TSNH?\n");
13446                         strm->last_msg_incomplete = 0;
13447                         asoc->stream_locked = 0;
13448                 }
13449                 SCTP_TCB_SEND_UNLOCK(stcb);
13450                 if (uio->uio_resid == 0) {
13451                         got_all_of_the_send = 1;
13452                 }
13453         } else {
13454                 /* We send in a 0, since we do NOT have any locks */
13455                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13456                 top = NULL;
13457                 if (srcv->sinfo_flags & SCTP_EOF) {
13458                         /*
13459                          * This should only happen for Panda for the mbuf
13460                          * send case, which does NOT yet support EEOR mode.
13461                          * Thus, we can just set this flag to do the proper
13462                          * EOF handling.
13463                          */
13464                         got_all_of_the_send = 1;
13465                 }
13466         }
13467         if (error) {
13468                 goto out;
13469         }
13470 dataless_eof:
13471         /* EOF thing ? */
13472         if ((srcv->sinfo_flags & SCTP_EOF) &&
13473             (got_all_of_the_send == 1)) {
13474                 SCTP_STAT_INCR(sctps_sends_with_eof);
13475                 error = 0;
13476                 if (hold_tcblock == 0) {
13477                         SCTP_TCB_LOCK(stcb);
13478                         hold_tcblock = 1;
13479                 }
13480                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13481                     TAILQ_EMPTY(&asoc->sent_queue) &&
13482                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13483                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13484                                 goto abort_anyway;
13485                         }
13486                         /* there is nothing queued to send, so I'm done... */
13487                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13488                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13489                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13490                                 struct sctp_nets *netp;
13491
13492                                 /* only send SHUTDOWN the first time through */
13493                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13494                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13495                                 }
13496                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13497                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13498                                 sctp_stop_timers_for_shutdown(stcb);
13499                                 if (stcb->asoc.alternate) {
13500                                         netp = stcb->asoc.alternate;
13501                                 } else {
13502                                         netp = stcb->asoc.primary_destination;
13503                                 }
13504                                 sctp_send_shutdown(stcb, netp);
13505                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13506                                     netp);
13507                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13508                                     asoc->primary_destination);
13509                         }
13510                 } else {
13511                         /*-
13512                          * we still got (or just got) data to send, so set
13513                          * SHUTDOWN_PENDING
13514                          */
13515                         /*-
13516                          * XXX sockets draft says that SCTP_EOF should be
13517                          * sent with no data.  currently, we will allow user
13518                          * data to be sent first and move to
13519                          * SHUTDOWN-PENDING
13520                          */
13521                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13522                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13523                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13524                                 if (hold_tcblock == 0) {
13525                                         SCTP_TCB_LOCK(stcb);
13526                                         hold_tcblock = 1;
13527                                 }
13528                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13529                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13530                                 }
13531                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13532                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13533                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13534                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13535                                         struct mbuf *op_err;
13536                                         char msg[SCTP_DIAG_INFO_LEN];
13537
13538                         abort_anyway:
13539                                         if (free_cnt_applied) {
13540                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13541                                                 free_cnt_applied = 0;
13542                                         }
13543                                         snprintf(msg, sizeof(msg),
13544                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13545                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13546                                             msg);
13547                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13548                                             op_err, SCTP_SO_LOCKED);
13549                                         /*
13550                                          * now relock the stcb so everything
13551                                          * is sane
13552                                          */
13553                                         hold_tcblock = 0;
13554                                         stcb = NULL;
13555                                         goto out;
13556                                 }
13557                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13558                                     asoc->primary_destination);
13559                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13560                         }
13561                 }
13562         }
13563 skip_out_eof:
13564         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13565                 some_on_control = 1;
13566         }
13567         if (queue_only_for_init) {
13568                 if (hold_tcblock == 0) {
13569                         SCTP_TCB_LOCK(stcb);
13570                         hold_tcblock = 1;
13571                 }
13572                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13573                         /* a collision took us forward? */
13574                         queue_only = 0;
13575                 } else {
13576                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13577                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13578                         queue_only = 1;
13579                 }
13580         }
13581         if ((net->flight_size > net->cwnd) &&
13582             (stcb->asoc.sctp_cmt_on_off == 0)) {
13583                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13584                 queue_only = 1;
13585         } else if (asoc->ifp_had_enobuf) {
13586                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13587                 if (net->flight_size > (2 * net->mtu)) {
13588                         queue_only = 1;
13589                 }
13590                 asoc->ifp_had_enobuf = 0;
13591         }
13592         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13593         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13594             (stcb->asoc.total_flight > 0) &&
13595             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13596             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13597                 /*-
13598                  * Ok, Nagle is set on and we have data outstanding.
13599                  * Don't send anything and let SACKs drive out the
13600                  * data unless wen have a "full" segment to send.
13601                  */
13602                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13603                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13604                 }
13605                 SCTP_STAT_INCR(sctps_naglequeued);
13606                 nagle_applies = 1;
13607         } else {
13608                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13609                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13610                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13611                 }
13612                 SCTP_STAT_INCR(sctps_naglesent);
13613                 nagle_applies = 0;
13614         }
13615         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13616                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13617                     nagle_applies, un_sent);
13618                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13619                     stcb->asoc.total_flight,
13620                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13621         }
13622         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13623                 /* we can attempt to send too. */
13624                 if (hold_tcblock == 0) {
13625                         /*
13626                          * If there is activity recv'ing sacks no need to
13627                          * send
13628                          */
13629                         if (SCTP_TCB_TRYLOCK(stcb)) {
13630                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13631                                 hold_tcblock = 1;
13632                         }
13633                 } else {
13634                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13635                 }
13636         } else if ((queue_only == 0) &&
13637                     (stcb->asoc.peers_rwnd == 0) &&
13638             (stcb->asoc.total_flight == 0)) {
13639                 /* We get to have a probe outstanding */
13640                 if (hold_tcblock == 0) {
13641                         hold_tcblock = 1;
13642                         SCTP_TCB_LOCK(stcb);
13643                 }
13644                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13645         } else if (some_on_control) {
13646                 int num_out, reason, frag_point;
13647
13648                 /* Here we do control only */
13649                 if (hold_tcblock == 0) {
13650                         hold_tcblock = 1;
13651                         SCTP_TCB_LOCK(stcb);
13652                 }
13653                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13654                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13655                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13656         }
13657         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13658             queue_only, stcb->asoc.peers_rwnd, un_sent,
13659             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13660             stcb->asoc.total_output_queue_size, error);
13661
13662 out:
13663 out_unlocked:
13664
13665         if (local_soresv && stcb) {
13666                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13667         }
13668         if (create_lock_applied) {
13669                 SCTP_ASOC_CREATE_UNLOCK(inp);
13670         }
13671         if ((stcb) && hold_tcblock) {
13672                 SCTP_TCB_UNLOCK(stcb);
13673         }
13674         if (stcb && free_cnt_applied) {
13675                 atomic_add_int(&stcb->asoc.refcnt, -1);
13676         }
13677 #ifdef INVARIANTS
13678         if (stcb) {
13679                 if (mtx_owned(&stcb->tcb_mtx)) {
13680                         panic("Leaving with tcb mtx owned?");
13681                 }
13682                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13683                         panic("Leaving with tcb send mtx owned?");
13684                 }
13685         }
13686 #endif
13687         if (top) {
13688                 sctp_m_freem(top);
13689         }
13690         if (control) {
13691                 sctp_m_freem(control);
13692         }
13693         return (error);
13694 }
13695
13696
13697 /*
13698  * generate an AUTHentication chunk, if required
13699  */
13700 struct mbuf *
13701 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13702     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13703     struct sctp_tcb *stcb, uint8_t chunk)
13704 {
13705         struct mbuf *m_auth;
13706         struct sctp_auth_chunk *auth;
13707         int chunk_len;
13708         struct mbuf *cn;
13709
13710         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13711             (stcb == NULL))
13712                 return (m);
13713
13714         if (stcb->asoc.auth_supported == 0) {
13715                 return (m);
13716         }
13717         /* does the requested chunk require auth? */
13718         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13719                 return (m);
13720         }
13721         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13722         if (m_auth == NULL) {
13723                 /* no mbuf's */
13724                 return (m);
13725         }
13726         /* reserve some space if this will be the first mbuf */
13727         if (m == NULL)
13728                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13729         /* fill in the AUTH chunk details */
13730         auth = mtod(m_auth, struct sctp_auth_chunk *);
13731         memset(auth, 0, sizeof(*auth));
13732         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13733         auth->ch.chunk_flags = 0;
13734         chunk_len = sizeof(*auth) +
13735             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13736         auth->ch.chunk_length = htons(chunk_len);
13737         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13738         /* key id and hmac digest will be computed and filled in upon send */
13739
13740         /* save the offset where the auth was inserted into the chain */
13741         *offset = 0;
13742         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13743                 *offset += SCTP_BUF_LEN(cn);
13744         }
13745
13746         /* update length and return pointer to the auth chunk */
13747         SCTP_BUF_LEN(m_auth) = chunk_len;
13748         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13749         if (auth_ret != NULL)
13750                 *auth_ret = auth;
13751
13752         return (m);
13753 }
13754
13755 #ifdef INET6
13756 int
13757 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13758 {
13759         struct nd_prefix *pfx = NULL;
13760         struct nd_pfxrouter *pfxrtr = NULL;
13761         struct sockaddr_in6 gw6;
13762
13763         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13764                 return (0);
13765
13766         /* get prefix entry of address */
13767         ND6_RLOCK();
13768         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13769                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13770                         continue;
13771                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13772                     &src6->sin6_addr, &pfx->ndpr_mask))
13773                         break;
13774         }
13775         /* no prefix entry in the prefix list */
13776         if (pfx == NULL) {
13777                 ND6_RUNLOCK();
13778                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13779                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13780                 return (0);
13781         }
13782         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13783         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13784
13785         /* search installed gateway from prefix entry */
13786         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13787                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13788                 gw6.sin6_family = AF_INET6;
13789                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13790                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13791                     sizeof(struct in6_addr));
13792                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13793                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13794                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13795                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13796                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13797                         ND6_RUNLOCK();
13798                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13799                         return (1);
13800                 }
13801         }
13802         ND6_RUNLOCK();
13803         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13804         return (0);
13805 }
13806 #endif
13807
13808 int
13809 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13810 {
13811 #ifdef INET
13812         struct sockaddr_in *sin, *mask;
13813         struct ifaddr *ifa;
13814         struct in_addr srcnetaddr, gwnetaddr;
13815
13816         if (ro == NULL || ro->ro_rt == NULL ||
13817             sifa->address.sa.sa_family != AF_INET) {
13818                 return (0);
13819         }
13820         ifa = (struct ifaddr *)sifa->ifa;
13821         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13822         sin = &sifa->address.sin;
13823         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13824         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13825         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13826         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13827
13828         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13829         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13830         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13831         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13832         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13833         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13834                 return (1);
13835         }
13836 #endif
13837         return (0);
13838 }