sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59
  60
  61 #define SCTP_MAX_GAPS_INARRAY 4
  62 struct sack_track {
  63         uint8_t right_edge;     /* mergable on the right edge */
  64         uint8_t left_edge;      /* mergable on the left edge */
  65         uint8_t num_entries;
  66         uint8_t spare;
  67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  68 };
  69
  70 const struct sack_track sack_array[256] = {
  71         {0, 0, 0, 0,            /* 0x00 */
  72                 {{0, 0},
  73                 {0, 0},
  74                 {0, 0},
  75                 {0, 0}
  76                 }
  77         },
  78         {1, 0, 1, 0,            /* 0x01 */
  79                 {{0, 0},
  80                 {0, 0},
  81                 {0, 0},
  82                 {0, 0}
  83                 }
  84         },
  85         {0, 0, 1, 0,            /* 0x02 */
  86                 {{1, 1},
  87                 {0, 0},
  88                 {0, 0},
  89                 {0, 0}
  90                 }
  91         },
  92         {1, 0, 1, 0,            /* 0x03 */
  93                 {{0, 1},
  94                 {0, 0},
  95                 {0, 0},
  96                 {0, 0}
  97                 }
  98         },
  99         {0, 0, 1, 0,            /* 0x04 */
 100                 {{2, 2},
 101                 {0, 0},
 102                 {0, 0},
 103                 {0, 0}
 104                 }
 105         },
 106         {1, 0, 2, 0,            /* 0x05 */
 107                 {{0, 0},
 108                 {2, 2},
 109                 {0, 0},
 110                 {0, 0}
 111                 }
 112         },
 113         {0, 0, 1, 0,            /* 0x06 */
 114                 {{1, 2},
 115                 {0, 0},
 116                 {0, 0},
 117                 {0, 0}
 118                 }
 119         },
 120         {1, 0, 1, 0,            /* 0x07 */
 121                 {{0, 2},
 122                 {0, 0},
 123                 {0, 0},
 124                 {0, 0}
 125                 }
 126         },
 127         {0, 0, 1, 0,            /* 0x08 */
 128                 {{3, 3},
 129                 {0, 0},
 130                 {0, 0},
 131                 {0, 0}
 132                 }
 133         },
 134         {1, 0, 2, 0,            /* 0x09 */
 135                 {{0, 0},
 136                 {3, 3},
 137                 {0, 0},
 138                 {0, 0}
 139                 }
 140         },
 141         {0, 0, 2, 0,            /* 0x0a */
 142                 {{1, 1},
 143                 {3, 3},
 144                 {0, 0},
 145                 {0, 0}
 146                 }
 147         },
 148         {1, 0, 2, 0,            /* 0x0b */
 149                 {{0, 1},
 150                 {3, 3},
 151                 {0, 0},
 152                 {0, 0}
 153                 }
 154         },
 155         {0, 0, 1, 0,            /* 0x0c */
 156                 {{2, 3},
 157                 {0, 0},
 158                 {0, 0},
 159                 {0, 0}
 160                 }
 161         },
 162         {1, 0, 2, 0,            /* 0x0d */
 163                 {{0, 0},
 164                 {2, 3},
 165                 {0, 0},
 166                 {0, 0}
 167                 }
 168         },
 169         {0, 0, 1, 0,            /* 0x0e */
 170                 {{1, 3},
 171                 {0, 0},
 172                 {0, 0},
 173                 {0, 0}
 174                 }
 175         },
 176         {1, 0, 1, 0,            /* 0x0f */
 177                 {{0, 3},
 178                 {0, 0},
 179                 {0, 0},
 180                 {0, 0}
 181                 }
 182         },
 183         {0, 0, 1, 0,            /* 0x10 */
 184                 {{4, 4},
 185                 {0, 0},
 186                 {0, 0},
 187                 {0, 0}
 188                 }
 189         },
 190         {1, 0, 2, 0,            /* 0x11 */
 191                 {{0, 0},
 192                 {4, 4},
 193                 {0, 0},
 194                 {0, 0}
 195                 }
 196         },
 197         {0, 0, 2, 0,            /* 0x12 */
 198                 {{1, 1},
 199                 {4, 4},
 200                 {0, 0},
 201                 {0, 0}
 202                 }
 203         },
 204         {1, 0, 2, 0,            /* 0x13 */
 205                 {{0, 1},
 206                 {4, 4},
 207                 {0, 0},
 208                 {0, 0}
 209                 }
 210         },
 211         {0, 0, 2, 0,            /* 0x14 */
 212                 {{2, 2},
 213                 {4, 4},
 214                 {0, 0},
 215                 {0, 0}
 216                 }
 217         },
 218         {1, 0, 3, 0,            /* 0x15 */
 219                 {{0, 0},
 220                 {2, 2},
 221                 {4, 4},
 222                 {0, 0}
 223                 }
 224         },
 225         {0, 0, 2, 0,            /* 0x16 */
 226                 {{1, 2},
 227                 {4, 4},
 228                 {0, 0},
 229                 {0, 0}
 230                 }
 231         },
 232         {1, 0, 2, 0,            /* 0x17 */
 233                 {{0, 2},
 234                 {4, 4},
 235                 {0, 0},
 236                 {0, 0}
 237                 }
 238         },
 239         {0, 0, 1, 0,            /* 0x18 */
 240                 {{3, 4},
 241                 {0, 0},
 242                 {0, 0},
 243                 {0, 0}
 244                 }
 245         },
 246         {1, 0, 2, 0,            /* 0x19 */
 247                 {{0, 0},
 248                 {3, 4},
 249                 {0, 0},
 250                 {0, 0}
 251                 }
 252         },
 253         {0, 0, 2, 0,            /* 0x1a */
 254                 {{1, 1},
 255                 {3, 4},
 256                 {0, 0},
 257                 {0, 0}
 258                 }
 259         },
 260         {1, 0, 2, 0,            /* 0x1b */
 261                 {{0, 1},
 262                 {3, 4},
 263                 {0, 0},
 264                 {0, 0}
 265                 }
 266         },
 267         {0, 0, 1, 0,            /* 0x1c */
 268                 {{2, 4},
 269                 {0, 0},
 270                 {0, 0},
 271                 {0, 0}
 272                 }
 273         },
 274         {1, 0, 2, 0,            /* 0x1d */
 275                 {{0, 0},
 276                 {2, 4},
 277                 {0, 0},
 278                 {0, 0}
 279                 }
 280         },
 281         {0, 0, 1, 0,            /* 0x1e */
 282                 {{1, 4},
 283                 {0, 0},
 284                 {0, 0},
 285                 {0, 0}
 286                 }
 287         },
 288         {1, 0, 1, 0,            /* 0x1f */
 289                 {{0, 4},
 290                 {0, 0},
 291                 {0, 0},
 292                 {0, 0}
 293                 }
 294         },
 295         {0, 0, 1, 0,            /* 0x20 */
 296                 {{5, 5},
 297                 {0, 0},
 298                 {0, 0},
 299                 {0, 0}
 300                 }
 301         },
 302         {1, 0, 2, 0,            /* 0x21 */
 303                 {{0, 0},
 304                 {5, 5},
 305                 {0, 0},
 306                 {0, 0}
 307                 }
 308         },
 309         {0, 0, 2, 0,            /* 0x22 */
 310                 {{1, 1},
 311                 {5, 5},
 312                 {0, 0},
 313                 {0, 0}
 314                 }
 315         },
 316         {1, 0, 2, 0,            /* 0x23 */
 317                 {{0, 1},
 318                 {5, 5},
 319                 {0, 0},
 320                 {0, 0}
 321                 }
 322         },
 323         {0, 0, 2, 0,            /* 0x24 */
 324                 {{2, 2},
 325                 {5, 5},
 326                 {0, 0},
 327                 {0, 0}
 328                 }
 329         },
 330         {1, 0, 3, 0,            /* 0x25 */
 331                 {{0, 0},
 332                 {2, 2},
 333                 {5, 5},
 334                 {0, 0}
 335                 }
 336         },
 337         {0, 0, 2, 0,            /* 0x26 */
 338                 {{1, 2},
 339                 {5, 5},
 340                 {0, 0},
 341                 {0, 0}
 342                 }
 343         },
 344         {1, 0, 2, 0,            /* 0x27 */
 345                 {{0, 2},
 346                 {5, 5},
 347                 {0, 0},
 348                 {0, 0}
 349                 }
 350         },
 351         {0, 0, 2, 0,            /* 0x28 */
 352                 {{3, 3},
 353                 {5, 5},
 354                 {0, 0},
 355                 {0, 0}
 356                 }
 357         },
 358         {1, 0, 3, 0,            /* 0x29 */
 359                 {{0, 0},
 360                 {3, 3},
 361                 {5, 5},
 362                 {0, 0}
 363                 }
 364         },
 365         {0, 0, 3, 0,            /* 0x2a */
 366                 {{1, 1},
 367                 {3, 3},
 368                 {5, 5},
 369                 {0, 0}
 370                 }
 371         },
 372         {1, 0, 3, 0,            /* 0x2b */
 373                 {{0, 1},
 374                 {3, 3},
 375                 {5, 5},
 376                 {0, 0}
 377                 }
 378         },
 379         {0, 0, 2, 0,            /* 0x2c */
 380                 {{2, 3},
 381                 {5, 5},
 382                 {0, 0},
 383                 {0, 0}
 384                 }
 385         },
 386         {1, 0, 3, 0,            /* 0x2d */
 387                 {{0, 0},
 388                 {2, 3},
 389                 {5, 5},
 390                 {0, 0}
 391                 }
 392         },
 393         {0, 0, 2, 0,            /* 0x2e */
 394                 {{1, 3},
 395                 {5, 5},
 396                 {0, 0},
 397                 {0, 0}
 398                 }
 399         },
 400         {1, 0, 2, 0,            /* 0x2f */
 401                 {{0, 3},
 402                 {5, 5},
 403                 {0, 0},
 404                 {0, 0}
 405                 }
 406         },
 407         {0, 0, 1, 0,            /* 0x30 */
 408                 {{4, 5},
 409                 {0, 0},
 410                 {0, 0},
 411                 {0, 0}
 412                 }
 413         },
 414         {1, 0, 2, 0,            /* 0x31 */
 415                 {{0, 0},
 416                 {4, 5},
 417                 {0, 0},
 418                 {0, 0}
 419                 }
 420         },
 421         {0, 0, 2, 0,            /* 0x32 */
 422                 {{1, 1},
 423                 {4, 5},
 424                 {0, 0},
 425                 {0, 0}
 426                 }
 427         },
 428         {1, 0, 2, 0,            /* 0x33 */
 429                 {{0, 1},
 430                 {4, 5},
 431                 {0, 0},
 432                 {0, 0}
 433                 }
 434         },
 435         {0, 0, 2, 0,            /* 0x34 */
 436                 {{2, 2},
 437                 {4, 5},
 438                 {0, 0},
 439                 {0, 0}
 440                 }
 441         },
 442         {1, 0, 3, 0,            /* 0x35 */
 443                 {{0, 0},
 444                 {2, 2},
 445                 {4, 5},
 446                 {0, 0}
 447                 }
 448         },
 449         {0, 0, 2, 0,            /* 0x36 */
 450                 {{1, 2},
 451                 {4, 5},
 452                 {0, 0},
 453                 {0, 0}
 454                 }
 455         },
 456         {1, 0, 2, 0,            /* 0x37 */
 457                 {{0, 2},
 458                 {4, 5},
 459                 {0, 0},
 460                 {0, 0}
 461                 }
 462         },
 463         {0, 0, 1, 0,            /* 0x38 */
 464                 {{3, 5},
 465                 {0, 0},
 466                 {0, 0},
 467                 {0, 0}
 468                 }
 469         },
 470         {1, 0, 2, 0,            /* 0x39 */
 471                 {{0, 0},
 472                 {3, 5},
 473                 {0, 0},
 474                 {0, 0}
 475                 }
 476         },
 477         {0, 0, 2, 0,            /* 0x3a */
 478                 {{1, 1},
 479                 {3, 5},
 480                 {0, 0},
 481                 {0, 0}
 482                 }
 483         },
 484         {1, 0, 2, 0,            /* 0x3b */
 485                 {{0, 1},
 486                 {3, 5},
 487                 {0, 0},
 488                 {0, 0}
 489                 }
 490         },
 491         {0, 0, 1, 0,            /* 0x3c */
 492                 {{2, 5},
 493                 {0, 0},
 494                 {0, 0},
 495                 {0, 0}
 496                 }
 497         },
 498         {1, 0, 2, 0,            /* 0x3d */
 499                 {{0, 0},
 500                 {2, 5},
 501                 {0, 0},
 502                 {0, 0}
 503                 }
 504         },
 505         {0, 0, 1, 0,            /* 0x3e */
 506                 {{1, 5},
 507                 {0, 0},
 508                 {0, 0},
 509                 {0, 0}
 510                 }
 511         },
 512         {1, 0, 1, 0,            /* 0x3f */
 513                 {{0, 5},
 514                 {0, 0},
 515                 {0, 0},
 516                 {0, 0}
 517                 }
 518         },
 519         {0, 0, 1, 0,            /* 0x40 */
 520                 {{6, 6},
 521                 {0, 0},
 522                 {0, 0},
 523                 {0, 0}
 524                 }
 525         },
 526         {1, 0, 2, 0,            /* 0x41 */
 527                 {{0, 0},
 528                 {6, 6},
 529                 {0, 0},
 530                 {0, 0}
 531                 }
 532         },
 533         {0, 0, 2, 0,            /* 0x42 */
 534                 {{1, 1},
 535                 {6, 6},
 536                 {0, 0},
 537                 {0, 0}
 538                 }
 539         },
 540         {1, 0, 2, 0,            /* 0x43 */
 541                 {{0, 1},
 542                 {6, 6},
 543                 {0, 0},
 544                 {0, 0}
 545                 }
 546         },
 547         {0, 0, 2, 0,            /* 0x44 */
 548                 {{2, 2},
 549                 {6, 6},
 550                 {0, 0},
 551                 {0, 0}
 552                 }
 553         },
 554         {1, 0, 3, 0,            /* 0x45 */
 555                 {{0, 0},
 556                 {2, 2},
 557                 {6, 6},
 558                 {0, 0}
 559                 }
 560         },
 561         {0, 0, 2, 0,            /* 0x46 */
 562                 {{1, 2},
 563                 {6, 6},
 564                 {0, 0},
 565                 {0, 0}
 566                 }
 567         },
 568         {1, 0, 2, 0,            /* 0x47 */
 569                 {{0, 2},
 570                 {6, 6},
 571                 {0, 0},
 572                 {0, 0}
 573                 }
 574         },
 575         {0, 0, 2, 0,            /* 0x48 */
 576                 {{3, 3},
 577                 {6, 6},
 578                 {0, 0},
 579                 {0, 0}
 580                 }
 581         },
 582         {1, 0, 3, 0,            /* 0x49 */
 583                 {{0, 0},
 584                 {3, 3},
 585                 {6, 6},
 586                 {0, 0}
 587                 }
 588         },
 589         {0, 0, 3, 0,            /* 0x4a */
 590                 {{1, 1},
 591                 {3, 3},
 592                 {6, 6},
 593                 {0, 0}
 594                 }
 595         },
 596         {1, 0, 3, 0,            /* 0x4b */
 597                 {{0, 1},
 598                 {3, 3},
 599                 {6, 6},
 600                 {0, 0}
 601                 }
 602         },
 603         {0, 0, 2, 0,            /* 0x4c */
 604                 {{2, 3},
 605                 {6, 6},
 606                 {0, 0},
 607                 {0, 0}
 608                 }
 609         },
 610         {1, 0, 3, 0,            /* 0x4d */
 611                 {{0, 0},
 612                 {2, 3},
 613                 {6, 6},
 614                 {0, 0}
 615                 }
 616         },
 617         {0, 0, 2, 0,            /* 0x4e */
 618                 {{1, 3},
 619                 {6, 6},
 620                 {0, 0},
 621                 {0, 0}
 622                 }
 623         },
 624         {1, 0, 2, 0,            /* 0x4f */
 625                 {{0, 3},
 626                 {6, 6},
 627                 {0, 0},
 628                 {0, 0}
 629                 }
 630         },
 631         {0, 0, 2, 0,            /* 0x50 */
 632                 {{4, 4},
 633                 {6, 6},
 634                 {0, 0},
 635                 {0, 0}
 636                 }
 637         },
 638         {1, 0, 3, 0,            /* 0x51 */
 639                 {{0, 0},
 640                 {4, 4},
 641                 {6, 6},
 642                 {0, 0}
 643                 }
 644         },
 645         {0, 0, 3, 0,            /* 0x52 */
 646                 {{1, 1},
 647                 {4, 4},
 648                 {6, 6},
 649                 {0, 0}
 650                 }
 651         },
 652         {1, 0, 3, 0,            /* 0x53 */
 653                 {{0, 1},
 654                 {4, 4},
 655                 {6, 6},
 656                 {0, 0}
 657                 }
 658         },
 659         {0, 0, 3, 0,            /* 0x54 */
 660                 {{2, 2},
 661                 {4, 4},
 662                 {6, 6},
 663                 {0, 0}
 664                 }
 665         },
 666         {1, 0, 4, 0,            /* 0x55 */
 667                 {{0, 0},
 668                 {2, 2},
 669                 {4, 4},
 670                 {6, 6}
 671                 }
 672         },
 673         {0, 0, 3, 0,            /* 0x56 */
 674                 {{1, 2},
 675                 {4, 4},
 676                 {6, 6},
 677                 {0, 0}
 678                 }
 679         },
 680         {1, 0, 3, 0,            /* 0x57 */
 681                 {{0, 2},
 682                 {4, 4},
 683                 {6, 6},
 684                 {0, 0}
 685                 }
 686         },
 687         {0, 0, 2, 0,            /* 0x58 */
 688                 {{3, 4},
 689                 {6, 6},
 690                 {0, 0},
 691                 {0, 0}
 692                 }
 693         },
 694         {1, 0, 3, 0,            /* 0x59 */
 695                 {{0, 0},
 696                 {3, 4},
 697                 {6, 6},
 698                 {0, 0}
 699                 }
 700         },
 701         {0, 0, 3, 0,            /* 0x5a */
 702                 {{1, 1},
 703                 {3, 4},
 704                 {6, 6},
 705                 {0, 0}
 706                 }
 707         },
 708         {1, 0, 3, 0,            /* 0x5b */
 709                 {{0, 1},
 710                 {3, 4},
 711                 {6, 6},
 712                 {0, 0}
 713                 }
 714         },
 715         {0, 0, 2, 0,            /* 0x5c */
 716                 {{2, 4},
 717                 {6, 6},
 718                 {0, 0},
 719                 {0, 0}
 720                 }
 721         },
 722         {1, 0, 3, 0,            /* 0x5d */
 723                 {{0, 0},
 724                 {2, 4},
 725                 {6, 6},
 726                 {0, 0}
 727                 }
 728         },
 729         {0, 0, 2, 0,            /* 0x5e */
 730                 {{1, 4},
 731                 {6, 6},
 732                 {0, 0},
 733                 {0, 0}
 734                 }
 735         },
 736         {1, 0, 2, 0,            /* 0x5f */
 737                 {{0, 4},
 738                 {6, 6},
 739                 {0, 0},
 740                 {0, 0}
 741                 }
 742         },
 743         {0, 0, 1, 0,            /* 0x60 */
 744                 {{5, 6},
 745                 {0, 0},
 746                 {0, 0},
 747                 {0, 0}
 748                 }
 749         },
 750         {1, 0, 2, 0,            /* 0x61 */
 751                 {{0, 0},
 752                 {5, 6},
 753                 {0, 0},
 754                 {0, 0}
 755                 }
 756         },
 757         {0, 0, 2, 0,            /* 0x62 */
 758                 {{1, 1},
 759                 {5, 6},
 760                 {0, 0},
 761                 {0, 0}
 762                 }
 763         },
 764         {1, 0, 2, 0,            /* 0x63 */
 765                 {{0, 1},
 766                 {5, 6},
 767                 {0, 0},
 768                 {0, 0}
 769                 }
 770         },
 771         {0, 0, 2, 0,            /* 0x64 */
 772                 {{2, 2},
 773                 {5, 6},
 774                 {0, 0},
 775                 {0, 0}
 776                 }
 777         },
 778         {1, 0, 3, 0,            /* 0x65 */
 779                 {{0, 0},
 780                 {2, 2},
 781                 {5, 6},
 782                 {0, 0}
 783                 }
 784         },
 785         {0, 0, 2, 0,            /* 0x66 */
 786                 {{1, 2},
 787                 {5, 6},
 788                 {0, 0},
 789                 {0, 0}
 790                 }
 791         },
 792         {1, 0, 2, 0,            /* 0x67 */
 793                 {{0, 2},
 794                 {5, 6},
 795                 {0, 0},
 796                 {0, 0}
 797                 }
 798         },
 799         {0, 0, 2, 0,            /* 0x68 */
 800                 {{3, 3},
 801                 {5, 6},
 802                 {0, 0},
 803                 {0, 0}
 804                 }
 805         },
 806         {1, 0, 3, 0,            /* 0x69 */
 807                 {{0, 0},
 808                 {3, 3},
 809                 {5, 6},
 810                 {0, 0}
 811                 }
 812         },
 813         {0, 0, 3, 0,            /* 0x6a */
 814                 {{1, 1},
 815                 {3, 3},
 816                 {5, 6},
 817                 {0, 0}
 818                 }
 819         },
 820         {1, 0, 3, 0,            /* 0x6b */
 821                 {{0, 1},
 822                 {3, 3},
 823                 {5, 6},
 824                 {0, 0}
 825                 }
 826         },
 827         {0, 0, 2, 0,            /* 0x6c */
 828                 {{2, 3},
 829                 {5, 6},
 830                 {0, 0},
 831                 {0, 0}
 832                 }
 833         },
 834         {1, 0, 3, 0,            /* 0x6d */
 835                 {{0, 0},
 836                 {2, 3},
 837                 {5, 6},
 838                 {0, 0}
 839                 }
 840         },
 841         {0, 0, 2, 0,            /* 0x6e */
 842                 {{1, 3},
 843                 {5, 6},
 844                 {0, 0},
 845                 {0, 0}
 846                 }
 847         },
 848         {1, 0, 2, 0,            /* 0x6f */
 849                 {{0, 3},
 850                 {5, 6},
 851                 {0, 0},
 852                 {0, 0}
 853                 }
 854         },
 855         {0, 0, 1, 0,            /* 0x70 */
 856                 {{4, 6},
 857                 {0, 0},
 858                 {0, 0},
 859                 {0, 0}
 860                 }
 861         },
 862         {1, 0, 2, 0,            /* 0x71 */
 863                 {{0, 0},
 864                 {4, 6},
 865                 {0, 0},
 866                 {0, 0}
 867                 }
 868         },
 869         {0, 0, 2, 0,            /* 0x72 */
 870                 {{1, 1},
 871                 {4, 6},
 872                 {0, 0},
 873                 {0, 0}
 874                 }
 875         },
 876         {1, 0, 2, 0,            /* 0x73 */
 877                 {{0, 1},
 878                 {4, 6},
 879                 {0, 0},
 880                 {0, 0}
 881                 }
 882         },
 883         {0, 0, 2, 0,            /* 0x74 */
 884                 {{2, 2},
 885                 {4, 6},
 886                 {0, 0},
 887                 {0, 0}
 888                 }
 889         },
 890         {1, 0, 3, 0,            /* 0x75 */
 891                 {{0, 0},
 892                 {2, 2},
 893                 {4, 6},
 894                 {0, 0}
 895                 }
 896         },
 897         {0, 0, 2, 0,            /* 0x76 */
 898                 {{1, 2},
 899                 {4, 6},
 900                 {0, 0},
 901                 {0, 0}
 902                 }
 903         },
 904         {1, 0, 2, 0,            /* 0x77 */
 905                 {{0, 2},
 906                 {4, 6},
 907                 {0, 0},
 908                 {0, 0}
 909                 }
 910         },
 911         {0, 0, 1, 0,            /* 0x78 */
 912                 {{3, 6},
 913                 {0, 0},
 914                 {0, 0},
 915                 {0, 0}
 916                 }
 917         },
 918         {1, 0, 2, 0,            /* 0x79 */
 919                 {{0, 0},
 920                 {3, 6},
 921                 {0, 0},
 922                 {0, 0}
 923                 }
 924         },
 925         {0, 0, 2, 0,            /* 0x7a */
 926                 {{1, 1},
 927                 {3, 6},
 928                 {0, 0},
 929                 {0, 0}
 930                 }
 931         },
 932         {1, 0, 2, 0,            /* 0x7b */
 933                 {{0, 1},
 934                 {3, 6},
 935                 {0, 0},
 936                 {0, 0}
 937                 }
 938         },
 939         {0, 0, 1, 0,            /* 0x7c */
 940                 {{2, 6},
 941                 {0, 0},
 942                 {0, 0},
 943                 {0, 0}
 944                 }
 945         },
 946         {1, 0, 2, 0,            /* 0x7d */
 947                 {{0, 0},
 948                 {2, 6},
 949                 {0, 0},
 950                 {0, 0}
 951                 }
 952         },
 953         {0, 0, 1, 0,            /* 0x7e */
 954                 {{1, 6},
 955                 {0, 0},
 956                 {0, 0},
 957                 {0, 0}
 958                 }
 959         },
 960         {1, 0, 1, 0,            /* 0x7f */
 961                 {{0, 6},
 962                 {0, 0},
 963                 {0, 0},
 964                 {0, 0}
 965                 }
 966         },
 967         {0, 1, 1, 0,            /* 0x80 */
 968                 {{7, 7},
 969                 {0, 0},
 970                 {0, 0},
 971                 {0, 0}
 972                 }
 973         },
 974         {1, 1, 2, 0,            /* 0x81 */
 975                 {{0, 0},
 976                 {7, 7},
 977                 {0, 0},
 978                 {0, 0}
 979                 }
 980         },
 981         {0, 1, 2, 0,            /* 0x82 */
 982                 {{1, 1},
 983                 {7, 7},
 984                 {0, 0},
 985                 {0, 0}
 986                 }
 987         },
 988         {1, 1, 2, 0,            /* 0x83 */
 989                 {{0, 1},
 990                 {7, 7},
 991                 {0, 0},
 992                 {0, 0}
 993                 }
 994         },
 995         {0, 1, 2, 0,            /* 0x84 */
 996                 {{2, 2},
 997                 {7, 7},
 998                 {0, 0},
 999                 {0, 0}
1000                 }
1001         },
1002         {1, 1, 3, 0,            /* 0x85 */
1003                 {{0, 0},
1004                 {2, 2},
1005                 {7, 7},
1006                 {0, 0}
1007                 }
1008         },
1009         {0, 1, 2, 0,            /* 0x86 */
1010                 {{1, 2},
1011                 {7, 7},
1012                 {0, 0},
1013                 {0, 0}
1014                 }
1015         },
1016         {1, 1, 2, 0,            /* 0x87 */
1017                 {{0, 2},
1018                 {7, 7},
1019                 {0, 0},
1020                 {0, 0}
1021                 }
1022         },
1023         {0, 1, 2, 0,            /* 0x88 */
1024                 {{3, 3},
1025                 {7, 7},
1026                 {0, 0},
1027                 {0, 0}
1028                 }
1029         },
1030         {1, 1, 3, 0,            /* 0x89 */
1031                 {{0, 0},
1032                 {3, 3},
1033                 {7, 7},
1034                 {0, 0}
1035                 }
1036         },
1037         {0, 1, 3, 0,            /* 0x8a */
1038                 {{1, 1},
1039                 {3, 3},
1040                 {7, 7},
1041                 {0, 0}
1042                 }
1043         },
1044         {1, 1, 3, 0,            /* 0x8b */
1045                 {{0, 1},
1046                 {3, 3},
1047                 {7, 7},
1048                 {0, 0}
1049                 }
1050         },
1051         {0, 1, 2, 0,            /* 0x8c */
1052                 {{2, 3},
1053                 {7, 7},
1054                 {0, 0},
1055                 {0, 0}
1056                 }
1057         },
1058         {1, 1, 3, 0,            /* 0x8d */
1059                 {{0, 0},
1060                 {2, 3},
1061                 {7, 7},
1062                 {0, 0}
1063                 }
1064         },
1065         {0, 1, 2, 0,            /* 0x8e */
1066                 {{1, 3},
1067                 {7, 7},
1068                 {0, 0},
1069                 {0, 0}
1070                 }
1071         },
1072         {1, 1, 2, 0,            /* 0x8f */
1073                 {{0, 3},
1074                 {7, 7},
1075                 {0, 0},
1076                 {0, 0}
1077                 }
1078         },
1079         {0, 1, 2, 0,            /* 0x90 */
1080                 {{4, 4},
1081                 {7, 7},
1082                 {0, 0},
1083                 {0, 0}
1084                 }
1085         },
1086         {1, 1, 3, 0,            /* 0x91 */
1087                 {{0, 0},
1088                 {4, 4},
1089                 {7, 7},
1090                 {0, 0}
1091                 }
1092         },
1093         {0, 1, 3, 0,            /* 0x92 */
1094                 {{1, 1},
1095                 {4, 4},
1096                 {7, 7},
1097                 {0, 0}
1098                 }
1099         },
1100         {1, 1, 3, 0,            /* 0x93 */
1101                 {{0, 1},
1102                 {4, 4},
1103                 {7, 7},
1104                 {0, 0}
1105                 }
1106         },
1107         {0, 1, 3, 0,            /* 0x94 */
1108                 {{2, 2},
1109                 {4, 4},
1110                 {7, 7},
1111                 {0, 0}
1112                 }
1113         },
1114         {1, 1, 4, 0,            /* 0x95 */
1115                 {{0, 0},
1116                 {2, 2},
1117                 {4, 4},
1118                 {7, 7}
1119                 }
1120         },
1121         {0, 1, 3, 0,            /* 0x96 */
1122                 {{1, 2},
1123                 {4, 4},
1124                 {7, 7},
1125                 {0, 0}
1126                 }
1127         },
1128         {1, 1, 3, 0,            /* 0x97 */
1129                 {{0, 2},
1130                 {4, 4},
1131                 {7, 7},
1132                 {0, 0}
1133                 }
1134         },
1135         {0, 1, 2, 0,            /* 0x98 */
1136                 {{3, 4},
1137                 {7, 7},
1138                 {0, 0},
1139                 {0, 0}
1140                 }
1141         },
1142         {1, 1, 3, 0,            /* 0x99 */
1143                 {{0, 0},
1144                 {3, 4},
1145                 {7, 7},
1146                 {0, 0}
1147                 }
1148         },
1149         {0, 1, 3, 0,            /* 0x9a */
1150                 {{1, 1},
1151                 {3, 4},
1152                 {7, 7},
1153                 {0, 0}
1154                 }
1155         },
1156         {1, 1, 3, 0,            /* 0x9b */
1157                 {{0, 1},
1158                 {3, 4},
1159                 {7, 7},
1160                 {0, 0}
1161                 }
1162         },
1163         {0, 1, 2, 0,            /* 0x9c */
1164                 {{2, 4},
1165                 {7, 7},
1166                 {0, 0},
1167                 {0, 0}
1168                 }
1169         },
1170         {1, 1, 3, 0,            /* 0x9d */
1171                 {{0, 0},
1172                 {2, 4},
1173                 {7, 7},
1174                 {0, 0}
1175                 }
1176         },
1177         {0, 1, 2, 0,            /* 0x9e */
1178                 {{1, 4},
1179                 {7, 7},
1180                 {0, 0},
1181                 {0, 0}
1182                 }
1183         },
1184         {1, 1, 2, 0,            /* 0x9f */
1185                 {{0, 4},
1186                 {7, 7},
1187                 {0, 0},
1188                 {0, 0}
1189                 }
1190         },
1191         {0, 1, 2, 0,            /* 0xa0 */
1192                 {{5, 5},
1193                 {7, 7},
1194                 {0, 0},
1195                 {0, 0}
1196                 }
1197         },
1198         {1, 1, 3, 0,            /* 0xa1 */
1199                 {{0, 0},
1200                 {5, 5},
1201                 {7, 7},
1202                 {0, 0}
1203                 }
1204         },
1205         {0, 1, 3, 0,            /* 0xa2 */
1206                 {{1, 1},
1207                 {5, 5},
1208                 {7, 7},
1209                 {0, 0}
1210                 }
1211         },
1212         {1, 1, 3, 0,            /* 0xa3 */
1213                 {{0, 1},
1214                 {5, 5},
1215                 {7, 7},
1216                 {0, 0}
1217                 }
1218         },
1219         {0, 1, 3, 0,            /* 0xa4 */
1220                 {{2, 2},
1221                 {5, 5},
1222                 {7, 7},
1223                 {0, 0}
1224                 }
1225         },
1226         {1, 1, 4, 0,            /* 0xa5 */
1227                 {{0, 0},
1228                 {2, 2},
1229                 {5, 5},
1230                 {7, 7}
1231                 }
1232         },
1233         {0, 1, 3, 0,            /* 0xa6 */
1234                 {{1, 2},
1235                 {5, 5},
1236                 {7, 7},
1237                 {0, 0}
1238                 }
1239         },
1240         {1, 1, 3, 0,            /* 0xa7 */
1241                 {{0, 2},
1242                 {5, 5},
1243                 {7, 7},
1244                 {0, 0}
1245                 }
1246         },
1247         {0, 1, 3, 0,            /* 0xa8 */
1248                 {{3, 3},
1249                 {5, 5},
1250                 {7, 7},
1251                 {0, 0}
1252                 }
1253         },
1254         {1, 1, 4, 0,            /* 0xa9 */
1255                 {{0, 0},
1256                 {3, 3},
1257                 {5, 5},
1258                 {7, 7}
1259                 }
1260         },
1261         {0, 1, 4, 0,            /* 0xaa */
1262                 {{1, 1},
1263                 {3, 3},
1264                 {5, 5},
1265                 {7, 7}
1266                 }
1267         },
1268         {1, 1, 4, 0,            /* 0xab */
1269                 {{0, 1},
1270                 {3, 3},
1271                 {5, 5},
1272                 {7, 7}
1273                 }
1274         },
1275         {0, 1, 3, 0,            /* 0xac */
1276                 {{2, 3},
1277                 {5, 5},
1278                 {7, 7},
1279                 {0, 0}
1280                 }
1281         },
1282         {1, 1, 4, 0,            /* 0xad */
1283                 {{0, 0},
1284                 {2, 3},
1285                 {5, 5},
1286                 {7, 7}
1287                 }
1288         },
1289         {0, 1, 3, 0,            /* 0xae */
1290                 {{1, 3},
1291                 {5, 5},
1292                 {7, 7},
1293                 {0, 0}
1294                 }
1295         },
1296         {1, 1, 3, 0,            /* 0xaf */
1297                 {{0, 3},
1298                 {5, 5},
1299                 {7, 7},
1300                 {0, 0}
1301                 }
1302         },
1303         {0, 1, 2, 0,            /* 0xb0 */
1304                 {{4, 5},
1305                 {7, 7},
1306                 {0, 0},
1307                 {0, 0}
1308                 }
1309         },
1310         {1, 1, 3, 0,            /* 0xb1 */
1311                 {{0, 0},
1312                 {4, 5},
1313                 {7, 7},
1314                 {0, 0}
1315                 }
1316         },
1317         {0, 1, 3, 0,            /* 0xb2 */
1318                 {{1, 1},
1319                 {4, 5},
1320                 {7, 7},
1321                 {0, 0}
1322                 }
1323         },
1324         {1, 1, 3, 0,            /* 0xb3 */
1325                 {{0, 1},
1326                 {4, 5},
1327                 {7, 7},
1328                 {0, 0}
1329                 }
1330         },
1331         {0, 1, 3, 0,            /* 0xb4 */
1332                 {{2, 2},
1333                 {4, 5},
1334                 {7, 7},
1335                 {0, 0}
1336                 }
1337         },
1338         {1, 1, 4, 0,            /* 0xb5 */
1339                 {{0, 0},
1340                 {2, 2},
1341                 {4, 5},
1342                 {7, 7}
1343                 }
1344         },
1345         {0, 1, 3, 0,            /* 0xb6 */
1346                 {{1, 2},
1347                 {4, 5},
1348                 {7, 7},
1349                 {0, 0}
1350                 }
1351         },
1352         {1, 1, 3, 0,            /* 0xb7 */
1353                 {{0, 2},
1354                 {4, 5},
1355                 {7, 7},
1356                 {0, 0}
1357                 }
1358         },
1359         {0, 1, 2, 0,            /* 0xb8 */
1360                 {{3, 5},
1361                 {7, 7},
1362                 {0, 0},
1363                 {0, 0}
1364                 }
1365         },
1366         {1, 1, 3, 0,            /* 0xb9 */
1367                 {{0, 0},
1368                 {3, 5},
1369                 {7, 7},
1370                 {0, 0}
1371                 }
1372         },
1373         {0, 1, 3, 0,            /* 0xba */
1374                 {{1, 1},
1375                 {3, 5},
1376                 {7, 7},
1377                 {0, 0}
1378                 }
1379         },
1380         {1, 1, 3, 0,            /* 0xbb */
1381                 {{0, 1},
1382                 {3, 5},
1383                 {7, 7},
1384                 {0, 0}
1385                 }
1386         },
1387         {0, 1, 2, 0,            /* 0xbc */
1388                 {{2, 5},
1389                 {7, 7},
1390                 {0, 0},
1391                 {0, 0}
1392                 }
1393         },
1394         {1, 1, 3, 0,            /* 0xbd */
1395                 {{0, 0},
1396                 {2, 5},
1397                 {7, 7},
1398                 {0, 0}
1399                 }
1400         },
1401         {0, 1, 2, 0,            /* 0xbe */
1402                 {{1, 5},
1403                 {7, 7},
1404                 {0, 0},
1405                 {0, 0}
1406                 }
1407         },
1408         {1, 1, 2, 0,            /* 0xbf */
1409                 {{0, 5},
1410                 {7, 7},
1411                 {0, 0},
1412                 {0, 0}
1413                 }
1414         },
1415         {0, 1, 1, 0,            /* 0xc0 */
1416                 {{6, 7},
1417                 {0, 0},
1418                 {0, 0},
1419                 {0, 0}
1420                 }
1421         },
1422         {1, 1, 2, 0,            /* 0xc1 */
1423                 {{0, 0},
1424                 {6, 7},
1425                 {0, 0},
1426                 {0, 0}
1427                 }
1428         },
1429         {0, 1, 2, 0,            /* 0xc2 */
1430                 {{1, 1},
1431                 {6, 7},
1432                 {0, 0},
1433                 {0, 0}
1434                 }
1435         },
1436         {1, 1, 2, 0,            /* 0xc3 */
1437                 {{0, 1},
1438                 {6, 7},
1439                 {0, 0},
1440                 {0, 0}
1441                 }
1442         },
1443         {0, 1, 2, 0,            /* 0xc4 */
1444                 {{2, 2},
1445                 {6, 7},
1446                 {0, 0},
1447                 {0, 0}
1448                 }
1449         },
1450         {1, 1, 3, 0,            /* 0xc5 */
1451                 {{0, 0},
1452                 {2, 2},
1453                 {6, 7},
1454                 {0, 0}
1455                 }
1456         },
1457         {0, 1, 2, 0,            /* 0xc6 */
1458                 {{1, 2},
1459                 {6, 7},
1460                 {0, 0},
1461                 {0, 0}
1462                 }
1463         },
1464         {1, 1, 2, 0,            /* 0xc7 */
1465                 {{0, 2},
1466                 {6, 7},
1467                 {0, 0},
1468                 {0, 0}
1469                 }
1470         },
1471         {0, 1, 2, 0,            /* 0xc8 */
1472                 {{3, 3},
1473                 {6, 7},
1474                 {0, 0},
1475                 {0, 0}
1476                 }
1477         },
1478         {1, 1, 3, 0,            /* 0xc9 */
1479                 {{0, 0},
1480                 {3, 3},
1481                 {6, 7},
1482                 {0, 0}
1483                 }
1484         },
1485         {0, 1, 3, 0,            /* 0xca */
1486                 {{1, 1},
1487                 {3, 3},
1488                 {6, 7},
1489                 {0, 0}
1490                 }
1491         },
1492         {1, 1, 3, 0,            /* 0xcb */
1493                 {{0, 1},
1494                 {3, 3},
1495                 {6, 7},
1496                 {0, 0}
1497                 }
1498         },
1499         {0, 1, 2, 0,            /* 0xcc */
1500                 {{2, 3},
1501                 {6, 7},
1502                 {0, 0},
1503                 {0, 0}
1504                 }
1505         },
1506         {1, 1, 3, 0,            /* 0xcd */
1507                 {{0, 0},
1508                 {2, 3},
1509                 {6, 7},
1510                 {0, 0}
1511                 }
1512         },
1513         {0, 1, 2, 0,            /* 0xce */
1514                 {{1, 3},
1515                 {6, 7},
1516                 {0, 0},
1517                 {0, 0}
1518                 }
1519         },
1520         {1, 1, 2, 0,            /* 0xcf */
1521                 {{0, 3},
1522                 {6, 7},
1523                 {0, 0},
1524                 {0, 0}
1525                 }
1526         },
1527         {0, 1, 2, 0,            /* 0xd0 */
1528                 {{4, 4},
1529                 {6, 7},
1530                 {0, 0},
1531                 {0, 0}
1532                 }
1533         },
1534         {1, 1, 3, 0,            /* 0xd1 */
1535                 {{0, 0},
1536                 {4, 4},
1537                 {6, 7},
1538                 {0, 0}
1539                 }
1540         },
1541         {0, 1, 3, 0,            /* 0xd2 */
1542                 {{1, 1},
1543                 {4, 4},
1544                 {6, 7},
1545                 {0, 0}
1546                 }
1547         },
1548         {1, 1, 3, 0,            /* 0xd3 */
1549                 {{0, 1},
1550                 {4, 4},
1551                 {6, 7},
1552                 {0, 0}
1553                 }
1554         },
1555         {0, 1, 3, 0,            /* 0xd4 */
1556                 {{2, 2},
1557                 {4, 4},
1558                 {6, 7},
1559                 {0, 0}
1560                 }
1561         },
1562         {1, 1, 4, 0,            /* 0xd5 */
1563                 {{0, 0},
1564                 {2, 2},
1565                 {4, 4},
1566                 {6, 7}
1567                 }
1568         },
1569         {0, 1, 3, 0,            /* 0xd6 */
1570                 {{1, 2},
1571                 {4, 4},
1572                 {6, 7},
1573                 {0, 0}
1574                 }
1575         },
1576         {1, 1, 3, 0,            /* 0xd7 */
1577                 {{0, 2},
1578                 {4, 4},
1579                 {6, 7},
1580                 {0, 0}
1581                 }
1582         },
1583         {0, 1, 2, 0,            /* 0xd8 */
1584                 {{3, 4},
1585                 {6, 7},
1586                 {0, 0},
1587                 {0, 0}
1588                 }
1589         },
1590         {1, 1, 3, 0,            /* 0xd9 */
1591                 {{0, 0},
1592                 {3, 4},
1593                 {6, 7},
1594                 {0, 0}
1595                 }
1596         },
1597         {0, 1, 3, 0,            /* 0xda */
1598                 {{1, 1},
1599                 {3, 4},
1600                 {6, 7},
1601                 {0, 0}
1602                 }
1603         },
1604         {1, 1, 3, 0,            /* 0xdb */
1605                 {{0, 1},
1606                 {3, 4},
1607                 {6, 7},
1608                 {0, 0}
1609                 }
1610         },
1611         {0, 1, 2, 0,            /* 0xdc */
1612                 {{2, 4},
1613                 {6, 7},
1614                 {0, 0},
1615                 {0, 0}
1616                 }
1617         },
1618         {1, 1, 3, 0,            /* 0xdd */
1619                 {{0, 0},
1620                 {2, 4},
1621                 {6, 7},
1622                 {0, 0}
1623                 }
1624         },
1625         {0, 1, 2, 0,            /* 0xde */
1626                 {{1, 4},
1627                 {6, 7},
1628                 {0, 0},
1629                 {0, 0}
1630                 }
1631         },
1632         {1, 1, 2, 0,            /* 0xdf */
1633                 {{0, 4},
1634                 {6, 7},
1635                 {0, 0},
1636                 {0, 0}
1637                 }
1638         },
1639         {0, 1, 1, 0,            /* 0xe0 */
1640                 {{5, 7},
1641                 {0, 0},
1642                 {0, 0},
1643                 {0, 0}
1644                 }
1645         },
1646         {1, 1, 2, 0,            /* 0xe1 */
1647                 {{0, 0},
1648                 {5, 7},
1649                 {0, 0},
1650                 {0, 0}
1651                 }
1652         },
1653         {0, 1, 2, 0,            /* 0xe2 */
1654                 {{1, 1},
1655                 {5, 7},
1656                 {0, 0},
1657                 {0, 0}
1658                 }
1659         },
1660         {1, 1, 2, 0,            /* 0xe3 */
1661                 {{0, 1},
1662                 {5, 7},
1663                 {0, 0},
1664                 {0, 0}
1665                 }
1666         },
1667         {0, 1, 2, 0,            /* 0xe4 */
1668                 {{2, 2},
1669                 {5, 7},
1670                 {0, 0},
1671                 {0, 0}
1672                 }
1673         },
1674         {1, 1, 3, 0,            /* 0xe5 */
1675                 {{0, 0},
1676                 {2, 2},
1677                 {5, 7},
1678                 {0, 0}
1679                 }
1680         },
1681         {0, 1, 2, 0,            /* 0xe6 */
1682                 {{1, 2},
1683                 {5, 7},
1684                 {0, 0},
1685                 {0, 0}
1686                 }
1687         },
1688         {1, 1, 2, 0,            /* 0xe7 */
1689                 {{0, 2},
1690                 {5, 7},
1691                 {0, 0},
1692                 {0, 0}
1693                 }
1694         },
1695         {0, 1, 2, 0,            /* 0xe8 */
1696                 {{3, 3},
1697                 {5, 7},
1698                 {0, 0},
1699                 {0, 0}
1700                 }
1701         },
1702         {1, 1, 3, 0,            /* 0xe9 */
1703                 {{0, 0},
1704                 {3, 3},
1705                 {5, 7},
1706                 {0, 0}
1707                 }
1708         },
1709         {0, 1, 3, 0,            /* 0xea */
1710                 {{1, 1},
1711                 {3, 3},
1712                 {5, 7},
1713                 {0, 0}
1714                 }
1715         },
1716         {1, 1, 3, 0,            /* 0xeb */
1717                 {{0, 1},
1718                 {3, 3},
1719                 {5, 7},
1720                 {0, 0}
1721                 }
1722         },
1723         {0, 1, 2, 0,            /* 0xec */
1724                 {{2, 3},
1725                 {5, 7},
1726                 {0, 0},
1727                 {0, 0}
1728                 }
1729         },
1730         {1, 1, 3, 0,            /* 0xed */
1731                 {{0, 0},
1732                 {2, 3},
1733                 {5, 7},
1734                 {0, 0}
1735                 }
1736         },
1737         {0, 1, 2, 0,            /* 0xee */
1738                 {{1, 3},
1739                 {5, 7},
1740                 {0, 0},
1741                 {0, 0}
1742                 }
1743         },
1744         {1, 1, 2, 0,            /* 0xef */
1745                 {{0, 3},
1746                 {5, 7},
1747                 {0, 0},
1748                 {0, 0}
1749                 }
1750         },
1751         {0, 1, 1, 0,            /* 0xf0 */
1752                 {{4, 7},
1753                 {0, 0},
1754                 {0, 0},
1755                 {0, 0}
1756                 }
1757         },
1758         {1, 1, 2, 0,            /* 0xf1 */
1759                 {{0, 0},
1760                 {4, 7},
1761                 {0, 0},
1762                 {0, 0}
1763                 }
1764         },
1765         {0, 1, 2, 0,            /* 0xf2 */
1766                 {{1, 1},
1767                 {4, 7},
1768                 {0, 0},
1769                 {0, 0}
1770                 }
1771         },
1772         {1, 1, 2, 0,            /* 0xf3 */
1773                 {{0, 1},
1774                 {4, 7},
1775                 {0, 0},
1776                 {0, 0}
1777                 }
1778         },
1779         {0, 1, 2, 0,            /* 0xf4 */
1780                 {{2, 2},
1781                 {4, 7},
1782                 {0, 0},
1783                 {0, 0}
1784                 }
1785         },
1786         {1, 1, 3, 0,            /* 0xf5 */
1787                 {{0, 0},
1788                 {2, 2},
1789                 {4, 7},
1790                 {0, 0}
1791                 }
1792         },
1793         {0, 1, 2, 0,            /* 0xf6 */
1794                 {{1, 2},
1795                 {4, 7},
1796                 {0, 0},
1797                 {0, 0}
1798                 }
1799         },
1800         {1, 1, 2, 0,            /* 0xf7 */
1801                 {{0, 2},
1802                 {4, 7},
1803                 {0, 0},
1804                 {0, 0}
1805                 }
1806         },
1807         {0, 1, 1, 0,            /* 0xf8 */
1808                 {{3, 7},
1809                 {0, 0},
1810                 {0, 0},
1811                 {0, 0}
1812                 }
1813         },
1814         {1, 1, 2, 0,            /* 0xf9 */
1815                 {{0, 0},
1816                 {3, 7},
1817                 {0, 0},
1818                 {0, 0}
1819                 }
1820         },
1821         {0, 1, 2, 0,            /* 0xfa */
1822                 {{1, 1},
1823                 {3, 7},
1824                 {0, 0},
1825                 {0, 0}
1826                 }
1827         },
1828         {1, 1, 2, 0,            /* 0xfb */
1829                 {{0, 1},
1830                 {3, 7},
1831                 {0, 0},
1832                 {0, 0}
1833                 }
1834         },
1835         {0, 1, 1, 0,            /* 0xfc */
1836                 {{2, 7},
1837                 {0, 0},
1838                 {0, 0},
1839                 {0, 0}
1840                 }
1841         },
1842         {1, 1, 2, 0,            /* 0xfd */
1843                 {{0, 0},
1844                 {2, 7},
1845                 {0, 0},
1846                 {0, 0}
1847                 }
1848         },
1849         {0, 1, 1, 0,            /* 0xfe */
1850                 {{1, 7},
1851                 {0, 0},
1852                 {0, 0},
1853                 {0, 0}
1854                 }
1855         },
1856         {1, 1, 1, 0,            /* 0xff */
1857                 {{0, 7},
1858                 {0, 0},
1859                 {0, 0},
1860                 {0, 0}
1861                 }
1862         }
1863 };
1864
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *parmh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946 #endif
1947
1948         switch (ifa->address.sa.sa_family) {
1949 #ifdef INET
1950         case AF_INET:
1951                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1952                 break;
1953 #endif
1954 #ifdef INET6
1955         case AF_INET6:
1956                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1957                 break;
1958 #endif
1959         default:
1960                 return (m);
1961         }
1962 #if defined(INET) || defined(INET6)
1963         if (M_TRAILINGSPACE(m) >= plen) {
1964                 /* easy side we just drop it on the end */
1965                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 parmh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = &ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         parmh->param_length = htons(plen);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += plen;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = &ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         parmh->param_length = htons(plen);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += plen;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         if (len != NULL) {
2020                 *len += plen;
2021         }
2022         return (mret);
2023 #endif
2024 }
2025
2026
2027 struct mbuf *
2028 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2029     struct sctp_scoping *scope,
2030     struct mbuf *m_at, int cnt_inits_to,
2031     uint16_t * padding_len, uint16_t * chunk_len)
2032 {
2033         struct sctp_vrf *vrf = NULL;
2034         int cnt, limit_out = 0, total_count;
2035         uint32_t vrf_id;
2036
2037         vrf_id = inp->def_vrf_id;
2038         SCTP_IPI_ADDR_RLOCK();
2039         vrf = sctp_find_vrf(vrf_id);
2040         if (vrf == NULL) {
2041                 SCTP_IPI_ADDR_RUNLOCK();
2042                 return (m_at);
2043         }
2044         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2045                 struct sctp_ifa *sctp_ifap;
2046                 struct sctp_ifn *sctp_ifnp;
2047
2048                 cnt = cnt_inits_to;
2049                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2050                         limit_out = 1;
2051                         cnt = SCTP_ADDRESS_LIMIT;
2052                         goto skip_count;
2053                 }
2054                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2055                         if ((scope->loopback_scope == 0) &&
2056                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2057                                 /*
2058                                  * Skip loopback devices if loopback_scope
2059                                  * not set
2060                                  */
2061                                 continue;
2062                         }
2063                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2064 #ifdef INET
2065                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2066                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2067                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2068                                         continue;
2069                                 }
2070 #endif
2071 #ifdef INET6
2072                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2073                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2074                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2075                                         continue;
2076                                 }
2077 #endif
2078                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2079                                         continue;
2080                                 }
2081                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2082                                         continue;
2083                                 }
2084                                 cnt++;
2085                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2086                                         break;
2087                                 }
2088                         }
2089                         if (cnt > SCTP_ADDRESS_LIMIT) {
2090                                 break;
2091                         }
2092                 }
2093 skip_count:
2094                 if (cnt > 1) {
2095                         total_count = 0;
2096                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2097                                 cnt = 0;
2098                                 if ((scope->loopback_scope == 0) &&
2099                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2100                                         /*
2101                                          * Skip loopback devices if
2102                                          * loopback_scope not set
2103                                          */
2104                                         continue;
2105                                 }
2106                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2107 #ifdef INET
2108                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2109                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2110                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2111                                                 continue;
2112                                         }
2113 #endif
2114 #ifdef INET6
2115                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2116                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2117                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2118                                                 continue;
2119                                         }
2120 #endif
2121                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2122                                                 continue;
2123                                         }
2124                                         if (sctp_is_address_in_scope(sctp_ifap,
2125                                             scope, 0) == 0) {
2126                                                 continue;
2127                                         }
2128                                         if ((chunk_len != NULL) &&
2129                                             (padding_len != NULL) &&
2130                                             (*padding_len > 0)) {
2131                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2132                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2133                                                 *chunk_len += *padding_len;
2134                                                 *padding_len = 0;
2135                                         }
2136                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2137                                         if (limit_out) {
2138                                                 cnt++;
2139                                                 total_count++;
2140                                                 if (cnt >= 2) {
2141                                                         /* two from each
2142                                                          * address */
2143                                                         break;
2144                                                 }
2145                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2146                                                         /* No more addresses */
2147                                                         break;
2148                                                 }
2149                                         }
2150                                 }
2151                         }
2152                 }
2153         } else {
2154                 struct sctp_laddr *laddr;
2155
2156                 cnt = cnt_inits_to;
2157                 /* First, how many ? */
2158                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2159                         if (laddr->ifa == NULL) {
2160                                 continue;
2161                         }
2162                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2163                                 /*
2164                                  * Address being deleted by the system, dont
2165                                  * list.
2166                                  */
2167                                 continue;
2168                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2169                                 /*
2170                                  * Address being deleted on this ep don't
2171                                  * list.
2172                                  */
2173                                 continue;
2174                         }
2175                         if (sctp_is_address_in_scope(laddr->ifa,
2176                             scope, 1) == 0) {
2177                                 continue;
2178                         }
2179                         cnt++;
2180                 }
2181                 /*
2182                  * To get through a NAT we only list addresses if we have
2183                  * more than one. That way if you just bind a single address
2184                  * we let the source of the init dictate our address.
2185                  */
2186                 if (cnt > 1) {
2187                         cnt = cnt_inits_to;
2188                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2189                                 if (laddr->ifa == NULL) {
2190                                         continue;
2191                                 }
2192                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2193                                         continue;
2194                                 }
2195                                 if (sctp_is_address_in_scope(laddr->ifa,
2196                                     scope, 0) == 0) {
2197                                         continue;
2198                                 }
2199                                 if ((chunk_len != NULL) &&
2200                                     (padding_len != NULL) &&
2201                                     (*padding_len > 0)) {
2202                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2203                                         SCTP_BUF_LEN(m_at) += *padding_len;
2204                                         *chunk_len += *padding_len;
2205                                         *padding_len = 0;
2206                                 }
2207                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2208                                 cnt++;
2209                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2210                                         break;
2211                                 }
2212                         }
2213                 }
2214         }
2215         SCTP_IPI_ADDR_RUNLOCK();
2216         return (m_at);
2217 }
2218
2219 static struct sctp_ifa *
2220 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2221     uint8_t dest_is_loop,
2222     uint8_t dest_is_priv,
2223     sa_family_t fam)
2224 {
2225         uint8_t dest_is_global = 0;
2226
2227         /* dest_is_priv is true if destination is a private address */
2228         /* dest_is_loop is true if destination is a loopback addresses */
2229
2230         /**
2231          * Here we determine if its a preferred address. A preferred address
2232          * means it is the same scope or higher scope then the destination.
2233          * L = loopback, P = private, G = global
2234          * -----------------------------------------
2235          *    src    |  dest | result
2236          *  ----------------------------------------
2237          *     L     |    L  |    yes
2238          *  -----------------------------------------
2239          *     P     |    L  |    yes-v4 no-v6
2240          *  -----------------------------------------
2241          *     G     |    L  |    yes-v4 no-v6
2242          *  -----------------------------------------
2243          *     L     |    P  |    no
2244          *  -----------------------------------------
2245          *     P     |    P  |    yes
2246          *  -----------------------------------------
2247          *     G     |    P  |    no
2248          *   -----------------------------------------
2249          *     L     |    G  |    no
2250          *   -----------------------------------------
2251          *     P     |    G  |    no
2252          *    -----------------------------------------
2253          *     G     |    G  |    yes
2254          *    -----------------------------------------
2255          */
2256
2257         if (ifa->address.sa.sa_family != fam) {
2258                 /* forget mis-matched family */
2259                 return (NULL);
2260         }
2261         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2262                 dest_is_global = 1;
2263         }
2264         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2265         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2266         /* Ok the address may be ok */
2267 #ifdef INET6
2268         if (fam == AF_INET6) {
2269                 /* ok to use deprecated addresses? no lets not! */
2270                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2271                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2272                         return (NULL);
2273                 }
2274                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2275                         if (dest_is_loop) {
2276                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2277                                 return (NULL);
2278                         }
2279                 }
2280                 if (ifa->src_is_glob) {
2281                         if (dest_is_loop) {
2282                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2283                                 return (NULL);
2284                         }
2285                 }
2286         }
2287 #endif
2288         /*
2289          * Now that we know what is what, implement or table this could in
2290          * theory be done slicker (it used to be), but this is
2291          * straightforward and easier to validate :-)
2292          */
2293         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2294             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2295         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2296             dest_is_loop, dest_is_priv, dest_is_global);
2297
2298         if ((ifa->src_is_loop) && (dest_is_priv)) {
2299                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2300                 return (NULL);
2301         }
2302         if ((ifa->src_is_glob) && (dest_is_priv)) {
2303                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2304                 return (NULL);
2305         }
2306         if ((ifa->src_is_loop) && (dest_is_global)) {
2307                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2308                 return (NULL);
2309         }
2310         if ((ifa->src_is_priv) && (dest_is_global)) {
2311                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2312                 return (NULL);
2313         }
2314         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2315         /* its a preferred address */
2316         return (ifa);
2317 }
2318
2319 static struct sctp_ifa *
2320 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2321     uint8_t dest_is_loop,
2322     uint8_t dest_is_priv,
2323     sa_family_t fam)
2324 {
2325         uint8_t dest_is_global = 0;
2326
2327         /**
2328          * Here we determine if its a acceptable address. A acceptable
2329          * address means it is the same scope or higher scope but we can
2330          * allow for NAT which means its ok to have a global dest and a
2331          * private src.
2332          *
2333          * L = loopback, P = private, G = global
2334          * -----------------------------------------
2335          *  src    |  dest | result
2336          * -----------------------------------------
2337          *   L     |   L   |    yes
2338          *  -----------------------------------------
2339          *   P     |   L   |    yes-v4 no-v6
2340          *  -----------------------------------------
2341          *   G     |   L   |    yes
2342          * -----------------------------------------
2343          *   L     |   P   |    no
2344          * -----------------------------------------
2345          *   P     |   P   |    yes
2346          * -----------------------------------------
2347          *   G     |   P   |    yes - May not work
2348          * -----------------------------------------
2349          *   L     |   G   |    no
2350          * -----------------------------------------
2351          *   P     |   G   |    yes - May not work
2352          * -----------------------------------------
2353          *   G     |   G   |    yes
2354          * -----------------------------------------
2355          */
2356
2357         if (ifa->address.sa.sa_family != fam) {
2358                 /* forget non matching family */
2359                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2360                     ifa->address.sa.sa_family, fam);
2361                 return (NULL);
2362         }
2363         /* Ok the address may be ok */
2364         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2365         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2366             dest_is_loop, dest_is_priv);
2367         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2368                 dest_is_global = 1;
2369         }
2370 #ifdef INET6
2371         if (fam == AF_INET6) {
2372                 /* ok to use deprecated addresses? */
2373                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2374                         return (NULL);
2375                 }
2376                 if (ifa->src_is_priv) {
2377                         /* Special case, linklocal to loop */
2378                         if (dest_is_loop)
2379                                 return (NULL);
2380                 }
2381         }
2382 #endif
2383         /*
2384          * Now that we know what is what, implement our table. This could in
2385          * theory be done slicker (it used to be), but this is
2386          * straightforward and easier to validate :-)
2387          */
2388         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2389             ifa->src_is_loop,
2390             dest_is_priv);
2391         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2392                 return (NULL);
2393         }
2394         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2395             ifa->src_is_loop,
2396             dest_is_global);
2397         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2398                 return (NULL);
2399         }
2400         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2401         /* its an acceptable address */
2402         return (ifa);
2403 }
2404
2405 int
2406 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2407 {
2408         struct sctp_laddr *laddr;
2409
2410         if (stcb == NULL) {
2411                 /* There are no restrictions, no TCB :-) */
2412                 return (0);
2413         }
2414         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2415                 if (laddr->ifa == NULL) {
2416                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2417                             __func__);
2418                         continue;
2419                 }
2420                 if (laddr->ifa == ifa) {
2421                         /* Yes it is on the list */
2422                         return (1);
2423                 }
2424         }
2425         return (0);
2426 }
2427
2428
2429 int
2430 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2431 {
2432         struct sctp_laddr *laddr;
2433
2434         if (ifa == NULL)
2435                 return (0);
2436         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2437                 if (laddr->ifa == NULL) {
2438                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2439                             __func__);
2440                         continue;
2441                 }
2442                 if ((laddr->ifa == ifa) && laddr->action == 0)
2443                         /* same pointer */
2444                         return (1);
2445         }
2446         return (0);
2447 }
2448
2449
2450
2451 static struct sctp_ifa *
2452 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2453     sctp_route_t * ro,
2454     uint32_t vrf_id,
2455     int non_asoc_addr_ok,
2456     uint8_t dest_is_priv,
2457     uint8_t dest_is_loop,
2458     sa_family_t fam)
2459 {
2460         struct sctp_laddr *laddr, *starting_point;
2461         void *ifn;
2462         int resettotop = 0;
2463         struct sctp_ifn *sctp_ifn;
2464         struct sctp_ifa *sctp_ifa, *sifa;
2465         struct sctp_vrf *vrf;
2466         uint32_t ifn_index;
2467
2468         vrf = sctp_find_vrf(vrf_id);
2469         if (vrf == NULL)
2470                 return (NULL);
2471
2472         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2473         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2474         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2475         /*
2476          * first question, is the ifn we will emit on in our list, if so, we
2477          * want such an address. Note that we first looked for a preferred
2478          * address.
2479          */
2480         if (sctp_ifn) {
2481                 /* is a preferred one on the interface we route out? */
2482                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2483 #ifdef INET
2484                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2485                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2486                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2487                                 continue;
2488                         }
2489 #endif
2490 #ifdef INET6
2491                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2492                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2493                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2494                                 continue;
2495                         }
2496 #endif
2497                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2498                             (non_asoc_addr_ok == 0))
2499                                 continue;
2500                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2501                             dest_is_loop,
2502                             dest_is_priv, fam);
2503                         if (sifa == NULL)
2504                                 continue;
2505                         if (sctp_is_addr_in_ep(inp, sifa)) {
2506                                 atomic_add_int(&sifa->refcount, 1);
2507                                 return (sifa);
2508                         }
2509                 }
2510         }
2511         /*
2512          * ok, now we now need to find one on the list of the addresses. We
2513          * can't get one on the emitting interface so let's find first a
2514          * preferred one. If not that an acceptable one otherwise... we
2515          * return NULL.
2516          */
2517         starting_point = inp->next_addr_touse;
2518 once_again:
2519         if (inp->next_addr_touse == NULL) {
2520                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2521                 resettotop = 1;
2522         }
2523         for (laddr = inp->next_addr_touse; laddr;
2524             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2525                 if (laddr->ifa == NULL) {
2526                         /* address has been removed */
2527                         continue;
2528                 }
2529                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2530                         /* address is being deleted */
2531                         continue;
2532                 }
2533                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2534                     dest_is_priv, fam);
2535                 if (sifa == NULL)
2536                         continue;
2537                 atomic_add_int(&sifa->refcount, 1);
2538                 return (sifa);
2539         }
2540         if (resettotop == 0) {
2541                 inp->next_addr_touse = NULL;
2542                 goto once_again;
2543         }
2544         inp->next_addr_touse = starting_point;
2545         resettotop = 0;
2546 once_again_too:
2547         if (inp->next_addr_touse == NULL) {
2548                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2549                 resettotop = 1;
2550         }
2551         /* ok, what about an acceptable address in the inp */
2552         for (laddr = inp->next_addr_touse; laddr;
2553             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2554                 if (laddr->ifa == NULL) {
2555                         /* address has been removed */
2556                         continue;
2557                 }
2558                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2559                         /* address is being deleted */
2560                         continue;
2561                 }
2562                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2563                     dest_is_priv, fam);
2564                 if (sifa == NULL)
2565                         continue;
2566                 atomic_add_int(&sifa->refcount, 1);
2567                 return (sifa);
2568         }
2569         if (resettotop == 0) {
2570                 inp->next_addr_touse = NULL;
2571                 goto once_again_too;
2572         }
2573         /*
2574          * no address bound can be a source for the destination we are in
2575          * trouble
2576          */
2577         return (NULL);
2578 }
2579
2580
2581
2582 static struct sctp_ifa *
2583 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2584     struct sctp_tcb *stcb,
2585     sctp_route_t * ro,
2586     uint32_t vrf_id,
2587     uint8_t dest_is_priv,
2588     uint8_t dest_is_loop,
2589     int non_asoc_addr_ok,
2590     sa_family_t fam)
2591 {
2592         struct sctp_laddr *laddr, *starting_point;
2593         void *ifn;
2594         struct sctp_ifn *sctp_ifn;
2595         struct sctp_ifa *sctp_ifa, *sifa;
2596         uint8_t start_at_beginning = 0;
2597         struct sctp_vrf *vrf;
2598         uint32_t ifn_index;
2599
2600         /*
2601          * first question, is the ifn we will emit on in our list, if so, we
2602          * want that one.
2603          */
2604         vrf = sctp_find_vrf(vrf_id);
2605         if (vrf == NULL)
2606                 return (NULL);
2607
2608         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2609         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2610         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2611
2612         /*
2613          * first question, is the ifn we will emit on in our list?  If so,
2614          * we want that one. First we look for a preferred. Second, we go
2615          * for an acceptable.
2616          */
2617         if (sctp_ifn) {
2618                 /* first try for a preferred address on the ep */
2619                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2620 #ifdef INET
2621                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2622                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2623                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2624                                 continue;
2625                         }
2626 #endif
2627 #ifdef INET6
2628                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2629                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2630                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2631                                 continue;
2632                         }
2633 #endif
2634                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2635                                 continue;
2636                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2637                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2638                                 if (sifa == NULL)
2639                                         continue;
2640                                 if (((non_asoc_addr_ok == 0) &&
2641                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2642                                     (non_asoc_addr_ok &&
2643                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2644                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2645                                         /* on the no-no list */
2646                                         continue;
2647                                 }
2648                                 atomic_add_int(&sifa->refcount, 1);
2649                                 return (sifa);
2650                         }
2651                 }
2652                 /* next try for an acceptable address on the ep */
2653                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2654 #ifdef INET
2655                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2656                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2657                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2658                                 continue;
2659                         }
2660 #endif
2661 #ifdef INET6
2662                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2663                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2664                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2665                                 continue;
2666                         }
2667 #endif
2668                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2669                                 continue;
2670                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2671                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2672                                 if (sifa == NULL)
2673                                         continue;
2674                                 if (((non_asoc_addr_ok == 0) &&
2675                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2676                                     (non_asoc_addr_ok &&
2677                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2678                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2679                                         /* on the no-no list */
2680                                         continue;
2681                                 }
2682                                 atomic_add_int(&sifa->refcount, 1);
2683                                 return (sifa);
2684                         }
2685                 }
2686
2687         }
2688         /*
2689          * if we can't find one like that then we must look at all addresses
2690          * bound to pick one at first preferable then secondly acceptable.
2691          */
2692         starting_point = stcb->asoc.last_used_address;
2693 sctp_from_the_top:
2694         if (stcb->asoc.last_used_address == NULL) {
2695                 start_at_beginning = 1;
2696                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2697         }
2698         /* search beginning with the last used address */
2699         for (laddr = stcb->asoc.last_used_address; laddr;
2700             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2701                 if (laddr->ifa == NULL) {
2702                         /* address has been removed */
2703                         continue;
2704                 }
2705                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2706                         /* address is being deleted */
2707                         continue;
2708                 }
2709                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2710                 if (sifa == NULL)
2711                         continue;
2712                 if (((non_asoc_addr_ok == 0) &&
2713                     (sctp_is_addr_restricted(stcb, sifa))) ||
2714                     (non_asoc_addr_ok &&
2715                     (sctp_is_addr_restricted(stcb, sifa)) &&
2716                     (!sctp_is_addr_pending(stcb, sifa)))) {
2717                         /* on the no-no list */
2718                         continue;
2719                 }
2720                 stcb->asoc.last_used_address = laddr;
2721                 atomic_add_int(&sifa->refcount, 1);
2722                 return (sifa);
2723         }
2724         if (start_at_beginning == 0) {
2725                 stcb->asoc.last_used_address = NULL;
2726                 goto sctp_from_the_top;
2727         }
2728         /* now try for any higher scope than the destination */
2729         stcb->asoc.last_used_address = starting_point;
2730         start_at_beginning = 0;
2731 sctp_from_the_top2:
2732         if (stcb->asoc.last_used_address == NULL) {
2733                 start_at_beginning = 1;
2734                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2735         }
2736         /* search beginning with the last used address */
2737         for (laddr = stcb->asoc.last_used_address; laddr;
2738             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2739                 if (laddr->ifa == NULL) {
2740                         /* address has been removed */
2741                         continue;
2742                 }
2743                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2744                         /* address is being deleted */
2745                         continue;
2746                 }
2747                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2748                     dest_is_priv, fam);
2749                 if (sifa == NULL)
2750                         continue;
2751                 if (((non_asoc_addr_ok == 0) &&
2752                     (sctp_is_addr_restricted(stcb, sifa))) ||
2753                     (non_asoc_addr_ok &&
2754                     (sctp_is_addr_restricted(stcb, sifa)) &&
2755                     (!sctp_is_addr_pending(stcb, sifa)))) {
2756                         /* on the no-no list */
2757                         continue;
2758                 }
2759                 stcb->asoc.last_used_address = laddr;
2760                 atomic_add_int(&sifa->refcount, 1);
2761                 return (sifa);
2762         }
2763         if (start_at_beginning == 0) {
2764                 stcb->asoc.last_used_address = NULL;
2765                 goto sctp_from_the_top2;
2766         }
2767         return (NULL);
2768 }
2769
2770 static struct sctp_ifa *
2771 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2772     struct sctp_inpcb *inp,
2773     struct sctp_tcb *stcb,
2774     int non_asoc_addr_ok,
2775     uint8_t dest_is_loop,
2776     uint8_t dest_is_priv,
2777     int addr_wanted,
2778     sa_family_t fam,
2779     sctp_route_t * ro
2780 )
2781 {
2782         struct sctp_ifa *ifa, *sifa;
2783         int num_eligible_addr = 0;
2784 #ifdef INET6
2785         struct sockaddr_in6 sin6, lsa6;
2786
2787         if (fam == AF_INET6) {
2788                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2789                 (void)sa6_recoverscope(&sin6);
2790         }
2791 #endif                          /* INET6 */
2792         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2793 #ifdef INET
2794                 if ((ifa->address.sa.sa_family == AF_INET) &&
2795                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2796                     &ifa->address.sin.sin_addr) != 0)) {
2797                         continue;
2798                 }
2799 #endif
2800 #ifdef INET6
2801                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2802                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2803                     &ifa->address.sin6.sin6_addr) != 0)) {
2804                         continue;
2805                 }
2806 #endif
2807                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2808                     (non_asoc_addr_ok == 0))
2809                         continue;
2810                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2811                     dest_is_priv, fam);
2812                 if (sifa == NULL)
2813                         continue;
2814 #ifdef INET6
2815                 if (fam == AF_INET6 &&
2816                     dest_is_loop &&
2817                     sifa->src_is_loop && sifa->src_is_priv) {
2818                         /*
2819                          * don't allow fe80::1 to be a src on loop ::1, we
2820                          * don't list it to the peer so we will get an
2821                          * abort.
2822                          */
2823                         continue;
2824                 }
2825                 if (fam == AF_INET6 &&
2826                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2827                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2828                         /* link-local <-> link-local must belong to the same
2829                          * scope. */
2830                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2831                         (void)sa6_recoverscope(&lsa6);
2832                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2833                                 continue;
2834                         }
2835                 }
2836 #endif                          /* INET6 */
2837
2838                 /*
2839                  * Check if the IPv6 address matches to next-hop. In the
2840                  * mobile case, old IPv6 address may be not deleted from the
2841                  * interface. Then, the interface has previous and new
2842                  * addresses.  We should use one corresponding to the
2843                  * next-hop.  (by micchie)
2844                  */
2845 #ifdef INET6
2846                 if (stcb && fam == AF_INET6 &&
2847                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2848                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2849                             == 0) {
2850                                 continue;
2851                         }
2852                 }
2853 #endif
2854 #ifdef INET
2855                 /* Avoid topologically incorrect IPv4 address */
2856                 if (stcb && fam == AF_INET &&
2857                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2858                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2859                                 continue;
2860                         }
2861                 }
2862 #endif
2863                 if (stcb) {
2864                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2865                                 continue;
2866                         }
2867                         if (((non_asoc_addr_ok == 0) &&
2868                             (sctp_is_addr_restricted(stcb, sifa))) ||
2869                             (non_asoc_addr_ok &&
2870                             (sctp_is_addr_restricted(stcb, sifa)) &&
2871                             (!sctp_is_addr_pending(stcb, sifa)))) {
2872                                 /*
2873                                  * It is restricted for some reason..
2874                                  * probably not yet added.
2875                                  */
2876                                 continue;
2877                         }
2878                 }
2879                 if (num_eligible_addr >= addr_wanted) {
2880                         return (sifa);
2881                 }
2882                 num_eligible_addr++;
2883         }
2884         return (NULL);
2885 }
2886
2887
2888 static int
2889 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2890     struct sctp_inpcb *inp,
2891     struct sctp_tcb *stcb,
2892     int non_asoc_addr_ok,
2893     uint8_t dest_is_loop,
2894     uint8_t dest_is_priv,
2895     sa_family_t fam)
2896 {
2897         struct sctp_ifa *ifa, *sifa;
2898         int num_eligible_addr = 0;
2899
2900         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2901 #ifdef INET
2902                 if ((ifa->address.sa.sa_family == AF_INET) &&
2903                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2904                     &ifa->address.sin.sin_addr) != 0)) {
2905                         continue;
2906                 }
2907 #endif
2908 #ifdef INET6
2909                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2910                     (stcb != NULL) &&
2911                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2912                     &ifa->address.sin6.sin6_addr) != 0)) {
2913                         continue;
2914                 }
2915 #endif
2916                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2917                     (non_asoc_addr_ok == 0)) {
2918                         continue;
2919                 }
2920                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2921                     dest_is_priv, fam);
2922                 if (sifa == NULL) {
2923                         continue;
2924                 }
2925                 if (stcb) {
2926                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2927                                 continue;
2928                         }
2929                         if (((non_asoc_addr_ok == 0) &&
2930                             (sctp_is_addr_restricted(stcb, sifa))) ||
2931                             (non_asoc_addr_ok &&
2932                             (sctp_is_addr_restricted(stcb, sifa)) &&
2933                             (!sctp_is_addr_pending(stcb, sifa)))) {
2934                                 /*
2935                                  * It is restricted for some reason..
2936                                  * probably not yet added.
2937                                  */
2938                                 continue;
2939                         }
2940                 }
2941                 num_eligible_addr++;
2942         }
2943         return (num_eligible_addr);
2944 }
2945
2946 static struct sctp_ifa *
2947 sctp_choose_boundall(struct sctp_inpcb *inp,
2948     struct sctp_tcb *stcb,
2949     struct sctp_nets *net,
2950     sctp_route_t * ro,
2951     uint32_t vrf_id,
2952     uint8_t dest_is_priv,
2953     uint8_t dest_is_loop,
2954     int non_asoc_addr_ok,
2955     sa_family_t fam)
2956 {
2957         int cur_addr_num = 0, num_preferred = 0;
2958         void *ifn;
2959         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2960         struct sctp_ifa *sctp_ifa, *sifa;
2961         uint32_t ifn_index;
2962         struct sctp_vrf *vrf;
2963 #ifdef INET
2964         int retried = 0;
2965 #endif
2966
2967         /*-
2968          * For boundall we can use any address in the association.
2969          * If non_asoc_addr_ok is set we can use any address (at least in
2970          * theory). So we look for preferred addresses first. If we find one,
2971          * we use it. Otherwise we next try to get an address on the
2972          * interface, which we should be able to do (unless non_asoc_addr_ok
2973          * is false and we are routed out that way). In these cases where we
2974          * can't use the address of the interface we go through all the
2975          * ifn's looking for an address we can use and fill that in. Punting
2976          * means we send back address 0, which will probably cause problems
2977          * actually since then IP will fill in the address of the route ifn,
2978          * which means we probably already rejected it.. i.e. here comes an
2979          * abort :-<.
2980          */
2981         vrf = sctp_find_vrf(vrf_id);
2982         if (vrf == NULL)
2983                 return (NULL);
2984
2985         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2986         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2987         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2988         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2989         if (sctp_ifn == NULL) {
2990                 /* ?? We don't have this guy ?? */
2991                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2992                 goto bound_all_plan_b;
2993         }
2994         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2995             ifn_index, sctp_ifn->ifn_name);
2996
2997         if (net) {
2998                 cur_addr_num = net->indx_of_eligible_next_to_use;
2999         }
3000         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3001             inp, stcb,
3002             non_asoc_addr_ok,
3003             dest_is_loop,
3004             dest_is_priv, fam);
3005         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3006             num_preferred, sctp_ifn->ifn_name);
3007         if (num_preferred == 0) {
3008                 /*
3009                  * no eligible addresses, we must use some other interface
3010                  * address if we can find one.
3011                  */
3012                 goto bound_all_plan_b;
3013         }
3014         /*
3015          * Ok we have num_eligible_addr set with how many we can use, this
3016          * may vary from call to call due to addresses being deprecated
3017          * etc..
3018          */
3019         if (cur_addr_num >= num_preferred) {
3020                 cur_addr_num = 0;
3021         }
3022         /*
3023          * select the nth address from the list (where cur_addr_num is the
3024          * nth) and 0 is the first one, 1 is the second one etc...
3025          */
3026         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3027
3028         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3029             dest_is_priv, cur_addr_num, fam, ro);
3030
3031         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3032         if (sctp_ifa) {
3033                 atomic_add_int(&sctp_ifa->refcount, 1);
3034                 if (net) {
3035                         /* save off where the next one we will want */
3036                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3037                 }
3038                 return (sctp_ifa);
3039         }
3040         /*
3041          * plan_b: Look at all interfaces and find a preferred address. If
3042          * no preferred fall through to plan_c.
3043          */
3044 bound_all_plan_b:
3045         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3046         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3047                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3048                     sctp_ifn->ifn_name);
3049                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3050                         /* wrong base scope */
3051                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3052                         continue;
3053                 }
3054                 if ((sctp_ifn == looked_at) && looked_at) {
3055                         /* already looked at this guy */
3056                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3057                         continue;
3058                 }
3059                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3060                     dest_is_loop, dest_is_priv, fam);
3061                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3062                     "Found ifn:%p %d preferred source addresses\n",
3063                     ifn, num_preferred);
3064                 if (num_preferred == 0) {
3065                         /* None on this interface. */
3066                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3067                         continue;
3068                 }
3069                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3070                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3071                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3072
3073                 /*
3074                  * Ok we have num_eligible_addr set with how many we can
3075                  * use, this may vary from call to call due to addresses
3076                  * being deprecated etc..
3077                  */
3078                 if (cur_addr_num >= num_preferred) {
3079                         cur_addr_num = 0;
3080                 }
3081                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3082                     dest_is_priv, cur_addr_num, fam, ro);
3083                 if (sifa == NULL)
3084                         continue;
3085                 if (net) {
3086                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3087                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3088                             cur_addr_num);
3089                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3090                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3091                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3092                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3093                 }
3094                 atomic_add_int(&sifa->refcount, 1);
3095                 return (sifa);
3096         }
3097 #ifdef INET
3098 again_with_private_addresses_allowed:
3099 #endif
3100         /* plan_c: do we have an acceptable address on the emit interface */
3101         sifa = NULL;
3102         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3103         if (emit_ifn == NULL) {
3104                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3105                 goto plan_d;
3106         }
3107         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3108                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3109 #ifdef INET
3110                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3111                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3112                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3113                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3114                         continue;
3115                 }
3116 #endif
3117 #ifdef INET6
3118                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3119                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3120                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122                         continue;
3123                 }
3124 #endif
3125                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3126                     (non_asoc_addr_ok == 0)) {
3127                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3128                         continue;
3129                 }
3130                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3131                     dest_is_priv, fam);
3132                 if (sifa == NULL) {
3133                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3134                         continue;
3135                 }
3136                 if (stcb) {
3137                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3138                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3139                                 sifa = NULL;
3140                                 continue;
3141                         }
3142                         if (((non_asoc_addr_ok == 0) &&
3143                             (sctp_is_addr_restricted(stcb, sifa))) ||
3144                             (non_asoc_addr_ok &&
3145                             (sctp_is_addr_restricted(stcb, sifa)) &&
3146                             (!sctp_is_addr_pending(stcb, sifa)))) {
3147                                 /*
3148                                  * It is restricted for some reason..
3149                                  * probably not yet added.
3150                                  */
3151                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3152                                 sifa = NULL;
3153                                 continue;
3154                         }
3155                 }
3156                 atomic_add_int(&sifa->refcount, 1);
3157                 goto out;
3158         }
3159 plan_d:
3160         /*
3161          * plan_d: We are in trouble. No preferred address on the emit
3162          * interface. And not even a preferred address on all interfaces. Go
3163          * out and see if we can find an acceptable address somewhere
3164          * amongst all interfaces.
3165          */
3166         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3167         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3168                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3169                         /* wrong base scope */
3170                         continue;
3171                 }
3172                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3173 #ifdef INET
3174                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3175                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3176                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3177                                 continue;
3178                         }
3179 #endif
3180 #ifdef INET6
3181                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3182                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3183                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3184                                 continue;
3185                         }
3186 #endif
3187                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3188                             (non_asoc_addr_ok == 0))
3189                                 continue;
3190                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3191                             dest_is_loop,
3192                             dest_is_priv, fam);
3193                         if (sifa == NULL)
3194                                 continue;
3195                         if (stcb) {
3196                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3197                                         sifa = NULL;
3198                                         continue;
3199                                 }
3200                                 if (((non_asoc_addr_ok == 0) &&
3201                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3202                                     (non_asoc_addr_ok &&
3203                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3204                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3205                                         /*
3206                                          * It is restricted for some
3207                                          * reason.. probably not yet added.
3208                                          */
3209                                         sifa = NULL;
3210                                         continue;
3211                                 }
3212                         }
3213                         goto out;
3214                 }
3215         }
3216 #ifdef INET
3217         if (stcb) {
3218                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3219                         stcb->asoc.scope.ipv4_local_scope = 1;
3220                         retried = 1;
3221                         goto again_with_private_addresses_allowed;
3222                 } else if (retried == 1) {
3223                         stcb->asoc.scope.ipv4_local_scope = 0;
3224                 }
3225         }
3226 #endif
3227 out:
3228 #ifdef INET
3229         if (sifa) {
3230                 if (retried == 1) {
3231                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3232                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3233                                         /* wrong base scope */
3234                                         continue;
3235                                 }
3236                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3237                                         struct sctp_ifa *tmp_sifa;
3238
3239 #ifdef INET
3240                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3241                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3242                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3243                                                 continue;
3244                                         }
3245 #endif
3246 #ifdef INET6
3247                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3248                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3249                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3250                                                 continue;
3251                                         }
3252 #endif
3253                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3254                                             (non_asoc_addr_ok == 0))
3255                                                 continue;
3256                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3257                                             dest_is_loop,
3258                                             dest_is_priv, fam);
3259                                         if (tmp_sifa == NULL) {
3260                                                 continue;
3261                                         }
3262                                         if (tmp_sifa == sifa) {
3263                                                 continue;
3264                                         }
3265                                         if (stcb) {
3266                                                 if (sctp_is_address_in_scope(tmp_sifa,
3267                                                     &stcb->asoc.scope, 0) == 0) {
3268                                                         continue;
3269                                                 }
3270                                                 if (((non_asoc_addr_ok == 0) &&
3271                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3272                                                     (non_asoc_addr_ok &&
3273                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3274                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3275                                                         /*
3276                                                          * It is restricted
3277                                                          * for some reason..
3278                                                          * probably not yet
3279                                                          * added.
3280                                                          */
3281                                                         continue;
3282                                                 }
3283                                         }
3284                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3285                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3286                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3287                                         }
3288                                 }
3289                         }
3290                 }
3291                 atomic_add_int(&sifa->refcount, 1);
3292         }
3293 #endif
3294         return (sifa);
3295 }
3296
3297
3298
3299 /* tcb may be NULL */
3300 struct sctp_ifa *
3301 sctp_source_address_selection(struct sctp_inpcb *inp,
3302     struct sctp_tcb *stcb,
3303     sctp_route_t * ro,
3304     struct sctp_nets *net,
3305     int non_asoc_addr_ok, uint32_t vrf_id)
3306 {
3307         struct sctp_ifa *answer;
3308         uint8_t dest_is_priv, dest_is_loop;
3309         sa_family_t fam;
3310 #ifdef INET
3311         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3312 #endif
3313 #ifdef INET6
3314         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3315 #endif
3316
3317         /**
3318          * Rules:
3319          * - Find the route if needed, cache if I can.
3320          * - Look at interface address in route, Is it in the bound list. If so we
3321          *   have the best source.
3322          * - If not we must rotate amongst the addresses.
3323          *
3324          * Cavets and issues
3325          *
3326          * Do we need to pay attention to scope. We can have a private address
3327          * or a global address we are sourcing or sending to. So if we draw
3328          * it out
3329          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3330          * For V4
3331          * ------------------------------------------
3332          *      source     *      dest  *  result
3333          * -----------------------------------------
3334          * <a>  Private    *    Global  *  NAT
3335          * -----------------------------------------
3336          * <b>  Private    *    Private *  No problem
3337          * -----------------------------------------
3338          * <c>  Global     *    Private *  Huh, How will this work?
3339          * -----------------------------------------
3340          * <d>  Global     *    Global  *  No Problem
3341          *------------------------------------------
3342          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3343          * For V6
3344          *------------------------------------------
3345          *      source     *      dest  *  result
3346          * -----------------------------------------
3347          * <a>  Linklocal  *    Global  *
3348          * -----------------------------------------
3349          * <b>  Linklocal  * Linklocal  *  No problem
3350          * -----------------------------------------
3351          * <c>  Global     * Linklocal  *  Huh, How will this work?
3352          * -----------------------------------------
3353          * <d>  Global     *    Global  *  No Problem
3354          *------------------------------------------
3355          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3356          *
3357          * And then we add to that what happens if there are multiple addresses
3358          * assigned to an interface. Remember the ifa on a ifn is a linked
3359          * list of addresses. So one interface can have more than one IP
3360          * address. What happens if we have both a private and a global
3361          * address? Do we then use context of destination to sort out which
3362          * one is best? And what about NAT's sending P->G may get you a NAT
3363          * translation, or should you select the G thats on the interface in
3364          * preference.
3365          *
3366          * Decisions:
3367          *
3368          * - count the number of addresses on the interface.
3369          * - if it is one, no problem except case <c>.
3370          *   For <a> we will assume a NAT out there.
3371          * - if there are more than one, then we need to worry about scope P
3372          *   or G. We should prefer G -> G and P -> P if possible.
3373          *   Then as a secondary fall back to mixed types G->P being a last
3374          *   ditch one.
3375          * - The above all works for bound all, but bound specific we need to
3376          *   use the same concept but instead only consider the bound
3377          *   addresses. If the bound set is NOT assigned to the interface then
3378          *   we must use rotation amongst the bound addresses..
3379          */
3380         if (ro->ro_rt == NULL) {
3381                 /*
3382                  * Need a route to cache.
3383                  */
3384                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3385         }
3386         if (ro->ro_rt == NULL) {
3387                 return (NULL);
3388         }
3389         fam = ro->ro_dst.sa_family;
3390         dest_is_priv = dest_is_loop = 0;
3391         /* Setup our scopes for the destination */
3392         switch (fam) {
3393 #ifdef INET
3394         case AF_INET:
3395                 /* Scope based on outbound address */
3396                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3397                         dest_is_loop = 1;
3398                         if (net != NULL) {
3399                                 /* mark it as local */
3400                                 net->addr_is_local = 1;
3401                         }
3402                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3403                         dest_is_priv = 1;
3404                 }
3405                 break;
3406 #endif
3407 #ifdef INET6
3408         case AF_INET6:
3409                 /* Scope based on outbound address */
3410                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3411                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3412                         /*
3413                          * If the address is a loopback address, which
3414                          * consists of "::1" OR "fe80::1%lo0", we are
3415                          * loopback scope. But we don't use dest_is_priv
3416                          * (link local addresses).
3417                          */
3418                         dest_is_loop = 1;
3419                         if (net != NULL) {
3420                                 /* mark it as local */
3421                                 net->addr_is_local = 1;
3422                         }
3423                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3424                         dest_is_priv = 1;
3425                 }
3426                 break;
3427 #endif
3428         }
3429         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3430         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3431         SCTP_IPI_ADDR_RLOCK();
3432         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3433                 /*
3434                  * Bound all case
3435                  */
3436                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3437                     dest_is_priv, dest_is_loop,
3438                     non_asoc_addr_ok, fam);
3439                 SCTP_IPI_ADDR_RUNLOCK();
3440                 return (answer);
3441         }
3442         /*
3443          * Subset bound case
3444          */
3445         if (stcb) {
3446                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3447                     vrf_id, dest_is_priv,
3448                     dest_is_loop,
3449                     non_asoc_addr_ok, fam);
3450         } else {
3451                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3452                     non_asoc_addr_ok,
3453                     dest_is_priv,
3454                     dest_is_loop, fam);
3455         }
3456         SCTP_IPI_ADDR_RUNLOCK();
3457         return (answer);
3458 }
3459
3460 static int
3461 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3462 {
3463         struct cmsghdr cmh;
3464         int tlen, at, found;
3465         struct sctp_sndinfo sndinfo;
3466         struct sctp_prinfo prinfo;
3467         struct sctp_authinfo authinfo;
3468
3469         tlen = SCTP_BUF_LEN(control);
3470         at = 0;
3471         found = 0;
3472         /*
3473          * Independent of how many mbufs, find the c_type inside the control
3474          * structure and copy out the data.
3475          */
3476         while (at < tlen) {
3477                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3478                         /* There is not enough room for one more. */
3479                         return (found);
3480                 }
3481                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3482                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3483                         /* We dont't have a complete CMSG header. */
3484                         return (found);
3485                 }
3486                 if (((int)cmh.cmsg_len + at) > tlen) {
3487                         /* We don't have the complete CMSG. */
3488                         return (found);
3489                 }
3490                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3491                     ((c_type == cmh.cmsg_type) ||
3492                     ((c_type == SCTP_SNDRCV) &&
3493                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3494                     (cmh.cmsg_type == SCTP_PRINFO) ||
3495                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3496                         if (c_type == cmh.cmsg_type) {
3497                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3498                                         return (found);
3499                                 }
3500                                 /* It is exactly what we want. Copy it out. */
3501                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3502                                 return (1);
3503                         } else {
3504                                 struct sctp_sndrcvinfo *sndrcvinfo;
3505
3506                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3507                                 if (found == 0) {
3508                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3509                                                 return (found);
3510                                         }
3511                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3512                                 }
3513                                 switch (cmh.cmsg_type) {
3514                                 case SCTP_SNDINFO:
3515                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3516                                                 return (found);
3517                                         }
3518                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3519                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3520                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3521                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3522                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3523                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3524                                         break;
3525                                 case SCTP_PRINFO:
3526                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3527                                                 return (found);
3528                                         }
3529                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3530                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3531                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3532                                         } else {
3533                                                 sndrcvinfo->sinfo_timetolive = 0;
3534                                         }
3535                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3536                                         break;
3537                                 case SCTP_AUTHINFO:
3538                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3539                                                 return (found);
3540                                         }
3541                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3542                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3543                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3544                                         break;
3545                                 default:
3546                                         return (found);
3547                                 }
3548                                 found = 1;
3549                         }
3550                 }
3551                 at += CMSG_ALIGN(cmh.cmsg_len);
3552         }
3553         return (found);
3554 }
3555
3556 static int
3557 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3558 {
3559         struct cmsghdr cmh;
3560         int tlen, at;
3561         struct sctp_initmsg initmsg;
3562 #ifdef INET
3563         struct sockaddr_in sin;
3564 #endif
3565 #ifdef INET6
3566         struct sockaddr_in6 sin6;
3567 #endif
3568
3569         tlen = SCTP_BUF_LEN(control);
3570         at = 0;
3571         while (at < tlen) {
3572                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3573                         /* There is not enough room for one more. */
3574                         *error = EINVAL;
3575                         return (1);
3576                 }
3577                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3578                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3579                         /* We dont't have a complete CMSG header. */
3580                         *error = EINVAL;
3581                         return (1);
3582                 }
3583                 if (((int)cmh.cmsg_len + at) > tlen) {
3584                         /* We don't have the complete CMSG. */
3585                         *error = EINVAL;
3586                         return (1);
3587                 }
3588                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3589                         switch (cmh.cmsg_type) {
3590                         case SCTP_INIT:
3591                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3592                                         *error = EINVAL;
3593                                         return (1);
3594                                 }
3595                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3596                                 if (initmsg.sinit_max_attempts)
3597                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3598                                 if (initmsg.sinit_num_ostreams)
3599                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3600                                 if (initmsg.sinit_max_instreams)
3601                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3602                                 if (initmsg.sinit_max_init_timeo)
3603                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3604                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3605                                         struct sctp_stream_out *tmp_str;
3606                                         unsigned int i;
3607 #if defined(SCTP_DETAILED_STR_STATS)
3608                                         int j;
3609 #endif
3610
3611                                         /* Default is NOT correct */
3612                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3613                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3614                                         SCTP_TCB_UNLOCK(stcb);
3615                                         SCTP_MALLOC(tmp_str,
3616                                             struct sctp_stream_out *,
3617                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3618                                             SCTP_M_STRMO);
3619                                         SCTP_TCB_LOCK(stcb);
3620                                         if (tmp_str != NULL) {
3621                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3622                                                 stcb->asoc.strmout = tmp_str;
3623                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3624                                         } else {
3625                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3626                                         }
3627                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3628                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3629                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3630                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3631                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3632 #if defined(SCTP_DETAILED_STR_STATS)
3633                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3634                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3635                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3636                                                 }
3637 #else
3638                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3639                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3640 #endif
3641                                                 stcb->asoc.strmout[i].stream_no = i;
3642                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3643                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3644                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3645                                         }
3646                                 }
3647                                 break;
3648 #ifdef INET
3649                         case SCTP_DSTADDRV4:
3650                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3651                                         *error = EINVAL;
3652                                         return (1);
3653                                 }
3654                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3655                                 sin.sin_family = AF_INET;
3656                                 sin.sin_len = sizeof(struct sockaddr_in);
3657                                 sin.sin_port = stcb->rport;
3658                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3659                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3660                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3661                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3662                                         *error = EINVAL;
3663                                         return (1);
3664                                 }
3665                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3666                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3667                                         *error = ENOBUFS;
3668                                         return (1);
3669                                 }
3670                                 break;
3671 #endif
3672 #ifdef INET6
3673                         case SCTP_DSTADDRV6:
3674                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3675                                         *error = EINVAL;
3676                                         return (1);
3677                                 }
3678                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3679                                 sin6.sin6_family = AF_INET6;
3680                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3681                                 sin6.sin6_port = stcb->rport;
3682                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3683                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3684                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3685                                         *error = EINVAL;
3686                                         return (1);
3687                                 }
3688 #ifdef INET
3689                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3690                                         in6_sin6_2_sin(&sin, &sin6);
3691                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3692                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3693                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3694                                                 *error = EINVAL;
3695                                                 return (1);
3696                                         }
3697                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3698                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3699                                                 *error = ENOBUFS;
3700                                                 return (1);
3701                                         }
3702                                 } else
3703 #endif
3704                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3705                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3706                                         *error = ENOBUFS;
3707                                         return (1);
3708                                 }
3709                                 break;
3710 #endif
3711                         default:
3712                                 break;
3713                         }
3714                 }
3715                 at += CMSG_ALIGN(cmh.cmsg_len);
3716         }
3717         return (0);
3718 }
3719
3720 static struct sctp_tcb *
3721 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3722     uint16_t port,
3723     struct mbuf *control,
3724     struct sctp_nets **net_p,
3725     int *error)
3726 {
3727         struct cmsghdr cmh;
3728         int tlen, at;
3729         struct sctp_tcb *stcb;
3730         struct sockaddr *addr;
3731 #ifdef INET
3732         struct sockaddr_in sin;
3733 #endif
3734 #ifdef INET6
3735         struct sockaddr_in6 sin6;
3736 #endif
3737
3738         tlen = SCTP_BUF_LEN(control);
3739         at = 0;
3740         while (at < tlen) {
3741                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3742                         /* There is not enough room for one more. */
3743                         *error = EINVAL;
3744                         return (NULL);
3745                 }
3746                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3747                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3748                         /* We dont't have a complete CMSG header. */
3749                         *error = EINVAL;
3750                         return (NULL);
3751                 }
3752                 if (((int)cmh.cmsg_len + at) > tlen) {
3753                         /* We don't have the complete CMSG. */
3754                         *error = EINVAL;
3755                         return (NULL);
3756                 }
3757                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3758                         switch (cmh.cmsg_type) {
3759 #ifdef INET
3760                         case SCTP_DSTADDRV4:
3761                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3762                                         *error = EINVAL;
3763                                         return (NULL);
3764                                 }
3765                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3766                                 sin.sin_family = AF_INET;
3767                                 sin.sin_len = sizeof(struct sockaddr_in);
3768                                 sin.sin_port = port;
3769                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3770                                 addr = (struct sockaddr *)&sin;
3771                                 break;
3772 #endif
3773 #ifdef INET6
3774                         case SCTP_DSTADDRV6:
3775                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3776                                         *error = EINVAL;
3777                                         return (NULL);
3778                                 }
3779                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3780                                 sin6.sin6_family = AF_INET6;
3781                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3782                                 sin6.sin6_port = port;
3783                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3784 #ifdef INET
3785                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3786                                         in6_sin6_2_sin(&sin, &sin6);
3787                                         addr = (struct sockaddr *)&sin;
3788                                 } else
3789 #endif
3790                                         addr = (struct sockaddr *)&sin6;
3791                                 break;
3792 #endif
3793                         default:
3794                                 addr = NULL;
3795                                 break;
3796                         }
3797                         if (addr) {
3798                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3799                                 if (stcb != NULL) {
3800                                         return (stcb);
3801                                 }
3802                         }
3803                 }
3804                 at += CMSG_ALIGN(cmh.cmsg_len);
3805         }
3806         return (NULL);
3807 }
3808
3809 static struct mbuf *
3810 sctp_add_cookie(struct mbuf *init, int init_offset,
3811     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3812 {
3813         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3814         struct sctp_state_cookie *stc;
3815         struct sctp_paramhdr *ph;
3816         uint8_t *foo;
3817         int sig_offset;
3818         uint16_t cookie_sz;
3819
3820         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3821             sizeof(struct sctp_paramhdr)), 0,
3822             M_NOWAIT, 1, MT_DATA);
3823         if (mret == NULL) {
3824                 return (NULL);
3825         }
3826         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3827         if (copy_init == NULL) {
3828                 sctp_m_freem(mret);
3829                 return (NULL);
3830         }
3831 #ifdef SCTP_MBUF_LOGGING
3832         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3833                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3834         }
3835 #endif
3836         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3837             M_NOWAIT);
3838         if (copy_initack == NULL) {
3839                 sctp_m_freem(mret);
3840                 sctp_m_freem(copy_init);
3841                 return (NULL);
3842         }
3843 #ifdef SCTP_MBUF_LOGGING
3844         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3845                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3846         }
3847 #endif
3848         /* easy side we just drop it on the end */
3849         ph = mtod(mret, struct sctp_paramhdr *);
3850         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3851             sizeof(struct sctp_paramhdr);
3852         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3853             sizeof(struct sctp_paramhdr));
3854         ph->param_type = htons(SCTP_STATE_COOKIE);
3855         ph->param_length = 0;   /* fill in at the end */
3856         /* Fill in the stc cookie data */
3857         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3858
3859         /* tack the INIT and then the INIT-ACK onto the chain */
3860         cookie_sz = 0;
3861         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3862                 cookie_sz += SCTP_BUF_LEN(m_at);
3863                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3864                         SCTP_BUF_NEXT(m_at) = copy_init;
3865                         break;
3866                 }
3867         }
3868         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3869                 cookie_sz += SCTP_BUF_LEN(m_at);
3870                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3871                         SCTP_BUF_NEXT(m_at) = copy_initack;
3872                         break;
3873                 }
3874         }
3875         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3876                 cookie_sz += SCTP_BUF_LEN(m_at);
3877                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3878                         break;
3879                 }
3880         }
3881         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3882         if (sig == NULL) {
3883                 /* no space, so free the entire chain */
3884                 sctp_m_freem(mret);
3885                 return (NULL);
3886         }
3887         SCTP_BUF_LEN(sig) = 0;
3888         SCTP_BUF_NEXT(m_at) = sig;
3889         sig_offset = 0;
3890         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3891         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3892         *signature = foo;
3893         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3894         cookie_sz += SCTP_SIGNATURE_SIZE;
3895         ph->param_length = htons(cookie_sz);
3896         return (mret);
3897 }
3898
3899
3900 static uint8_t
3901 sctp_get_ect(struct sctp_tcb *stcb)
3902 {
3903         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3904                 return (SCTP_ECT0_BIT);
3905         } else {
3906                 return (0);
3907         }
3908 }
3909
3910 #if defined(INET) || defined(INET6)
3911 static void
3912 sctp_handle_no_route(struct sctp_tcb *stcb,
3913     struct sctp_nets *net,
3914     int so_locked)
3915 {
3916         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3917
3918         if (net) {
3919                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3920                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3921                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3922                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3923                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3924                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3925                                     stcb, 0,
3926                                     (void *)net,
3927                                     so_locked);
3928                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3929                                 net->dest_state &= ~SCTP_ADDR_PF;
3930                         }
3931                 }
3932                 if (stcb) {
3933                         if (net == stcb->asoc.primary_destination) {
3934                                 /* need a new primary */
3935                                 struct sctp_nets *alt;
3936
3937                                 alt = sctp_find_alternate_net(stcb, net, 0);
3938                                 if (alt != net) {
3939                                         if (stcb->asoc.alternate) {
3940                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3941                                         }
3942                                         stcb->asoc.alternate = alt;
3943                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3944                                         if (net->ro._s_addr) {
3945                                                 sctp_free_ifa(net->ro._s_addr);
3946                                                 net->ro._s_addr = NULL;
3947                                         }
3948                                         net->src_addr_selected = 0;
3949                                 }
3950                         }
3951                 }
3952         }
3953 }
3954 #endif
3955
3956 static int
3957 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3958     struct sctp_tcb *stcb,      /* may be NULL */
3959     struct sctp_nets *net,
3960     struct sockaddr *to,
3961     struct mbuf *m,
3962     uint32_t auth_offset,
3963     struct sctp_auth_chunk *auth,
3964     uint16_t auth_keyid,
3965     int nofragment_flag,
3966     int ecn_ok,
3967     int out_of_asoc_ok,
3968     uint16_t src_port,
3969     uint16_t dest_port,
3970     uint32_t v_tag,
3971     uint16_t port,
3972     union sctp_sockstore *over_addr,
3973     uint8_t mflowtype, uint32_t mflowid,
3974 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3975     int so_locked SCTP_UNUSED
3976 #else
3977     int so_locked
3978 #endif
3979 )
3980 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3981 {
3982         /**
3983          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3984          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3985          * - fill in the HMAC digest of any AUTH chunk in the packet.
3986          * - calculate and fill in the SCTP checksum.
3987          * - prepend an IP address header.
3988          * - if boundall use INADDR_ANY.
3989          * - if boundspecific do source address selection.
3990          * - set fragmentation option for ipV4.
3991          * - On return from IP output, check/adjust mtu size of output
3992          *   interface and smallest_mtu size as well.
3993          */
3994         /* Will need ifdefs around this */
3995         struct mbuf *newm;
3996         struct sctphdr *sctphdr;
3997         int packet_length;
3998         int ret;
3999 #if defined(INET) || defined(INET6)
4000         uint32_t vrf_id;
4001 #endif
4002 #if defined(INET) || defined(INET6)
4003         struct mbuf *o_pak;
4004         sctp_route_t *ro = NULL;
4005         struct udphdr *udp = NULL;
4006 #endif
4007         uint8_t tos_value;
4008 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4009         struct socket *so = NULL;
4010 #endif
4011
4012         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4013                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4014                 sctp_m_freem(m);
4015                 return (EFAULT);
4016         }
4017 #if defined(INET) || defined(INET6)
4018         if (stcb) {
4019                 vrf_id = stcb->asoc.vrf_id;
4020         } else {
4021                 vrf_id = inp->def_vrf_id;
4022         }
4023 #endif
4024         /* fill in the HMAC digest for any AUTH chunk in the packet */
4025         if ((auth != NULL) && (stcb != NULL)) {
4026                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4027         }
4028         if (net) {
4029                 tos_value = net->dscp;
4030         } else if (stcb) {
4031                 tos_value = stcb->asoc.default_dscp;
4032         } else {
4033                 tos_value = inp->sctp_ep.default_dscp;
4034         }
4035
4036         switch (to->sa_family) {
4037 #ifdef INET
4038         case AF_INET:
4039                 {
4040                         struct ip *ip = NULL;
4041                         sctp_route_t iproute;
4042                         int len;
4043
4044                         len = SCTP_MIN_V4_OVERHEAD;
4045                         if (port) {
4046                                 len += sizeof(struct udphdr);
4047                         }
4048                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4049                         if (newm == NULL) {
4050                                 sctp_m_freem(m);
4051                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4052                                 return (ENOMEM);
4053                         }
4054                         SCTP_ALIGN_TO_END(newm, len);
4055                         SCTP_BUF_LEN(newm) = len;
4056                         SCTP_BUF_NEXT(newm) = m;
4057                         m = newm;
4058                         if (net != NULL) {
4059                                 m->m_pkthdr.flowid = net->flowid;
4060                                 M_HASHTYPE_SET(m, net->flowtype);
4061                         } else {
4062                                 m->m_pkthdr.flowid = mflowid;
4063                                 M_HASHTYPE_SET(m, mflowtype);
4064                         }
4065                         packet_length = sctp_calculate_len(m);
4066                         ip = mtod(m, struct ip *);
4067                         ip->ip_v = IPVERSION;
4068                         ip->ip_hl = (sizeof(struct ip) >> 2);
4069                         if (tos_value == 0) {
4070                                 /*
4071                                  * This means especially, that it is not set
4072                                  * at the SCTP layer. So use the value from
4073                                  * the IP layer.
4074                                  */
4075                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4076                         }
4077                         tos_value &= 0xfc;
4078                         if (ecn_ok) {
4079                                 tos_value |= sctp_get_ect(stcb);
4080                         }
4081                         if ((nofragment_flag) && (port == 0)) {
4082                                 ip->ip_off = htons(IP_DF);
4083                         } else {
4084                                 ip->ip_off = htons(0);
4085                         }
4086                         /* FreeBSD has a function for ip_id's */
4087                         ip_fillid(ip);
4088
4089                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4090                         ip->ip_len = htons(packet_length);
4091                         ip->ip_tos = tos_value;
4092                         if (port) {
4093                                 ip->ip_p = IPPROTO_UDP;
4094                         } else {
4095                                 ip->ip_p = IPPROTO_SCTP;
4096                         }
4097                         ip->ip_sum = 0;
4098                         if (net == NULL) {
4099                                 ro = &iproute;
4100                                 memset(&iproute, 0, sizeof(iproute));
4101                                 memcpy(&ro->ro_dst, to, to->sa_len);
4102                         } else {
4103                                 ro = (sctp_route_t *) & net->ro;
4104                         }
4105                         /* Now the address selection part */
4106                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4107
4108                         /* call the routine to select the src address */
4109                         if (net && out_of_asoc_ok == 0) {
4110                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4111                                         sctp_free_ifa(net->ro._s_addr);
4112                                         net->ro._s_addr = NULL;
4113                                         net->src_addr_selected = 0;
4114                                         if (ro->ro_rt) {
4115                                                 RTFREE(ro->ro_rt);
4116                                                 ro->ro_rt = NULL;
4117                                         }
4118                                 }
4119                                 if (net->src_addr_selected == 0) {
4120                                         /* Cache the source address */
4121                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4122                                             ro, net, 0,
4123                                             vrf_id);
4124                                         net->src_addr_selected = 1;
4125                                 }
4126                                 if (net->ro._s_addr == NULL) {
4127                                         /* No route to host */
4128                                         net->src_addr_selected = 0;
4129                                         sctp_handle_no_route(stcb, net, so_locked);
4130                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4131                                         sctp_m_freem(m);
4132                                         return (EHOSTUNREACH);
4133                                 }
4134                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4135                         } else {
4136                                 if (over_addr == NULL) {
4137                                         struct sctp_ifa *_lsrc;
4138
4139                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4140                                             net,
4141                                             out_of_asoc_ok,
4142                                             vrf_id);
4143                                         if (_lsrc == NULL) {
4144                                                 sctp_handle_no_route(stcb, net, so_locked);
4145                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4146                                                 sctp_m_freem(m);
4147                                                 return (EHOSTUNREACH);
4148                                         }
4149                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4150                                         sctp_free_ifa(_lsrc);
4151                                 } else {
4152                                         ip->ip_src = over_addr->sin.sin_addr;
4153                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4154                                 }
4155                         }
4156                         if (port) {
4157                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4158                                         sctp_handle_no_route(stcb, net, so_locked);
4159                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4160                                         sctp_m_freem(m);
4161                                         return (EHOSTUNREACH);
4162                                 }
4163                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4164                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4165                                 udp->uh_dport = port;
4166                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip)));
4167                                 if (V_udp_cksum) {
4168                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4169                                 } else {
4170                                         udp->uh_sum = 0;
4171                                 }
4172                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4173                         } else {
4174                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4175                         }
4176
4177                         sctphdr->src_port = src_port;
4178                         sctphdr->dest_port = dest_port;
4179                         sctphdr->v_tag = v_tag;
4180                         sctphdr->checksum = 0;
4181
4182                         /*
4183                          * If source address selection fails and we find no
4184                          * route then the ip_output should fail as well with
4185                          * a NO_ROUTE_TO_HOST type error. We probably should
4186                          * catch that somewhere and abort the association
4187                          * right away (assuming this is an INIT being sent).
4188                          */
4189                         if (ro->ro_rt == NULL) {
4190                                 /*
4191                                  * src addr selection failed to find a route
4192                                  * (or valid source addr), so we can't get
4193                                  * there from here (yet)!
4194                                  */
4195                                 sctp_handle_no_route(stcb, net, so_locked);
4196                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4197                                 sctp_m_freem(m);
4198                                 return (EHOSTUNREACH);
4199                         }
4200                         if (ro != &iproute) {
4201                                 memcpy(&iproute, ro, sizeof(*ro));
4202                         }
4203                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4204                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4205                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4206                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4207                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4208                             (void *)ro->ro_rt);
4209
4210                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4211                                 /* failed to prepend data, give up */
4212                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4213                                 sctp_m_freem(m);
4214                                 return (ENOMEM);
4215                         }
4216                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4217                         if (port) {
4218 #if defined(SCTP_WITH_NO_CSUM)
4219                                 SCTP_STAT_INCR(sctps_sendnocrc);
4220 #else
4221                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4222                                 SCTP_STAT_INCR(sctps_sendswcrc);
4223 #endif
4224                                 if (V_udp_cksum) {
4225                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4226                                 }
4227                         } else {
4228 #if defined(SCTP_WITH_NO_CSUM)
4229                                 SCTP_STAT_INCR(sctps_sendnocrc);
4230 #else
4231                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4232                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4233                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4234 #endif
4235                         }
4236 #ifdef SCTP_PACKET_LOGGING
4237                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4238                                 sctp_packet_log(o_pak);
4239 #endif
4240                         /* send it out.  table id is taken from stcb */
4241 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4242                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4243                                 so = SCTP_INP_SO(inp);
4244                                 SCTP_SOCKET_UNLOCK(so, 0);
4245                         }
4246 #endif
4247                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4249                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4250                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4251                                 SCTP_TCB_UNLOCK(stcb);
4252                                 SCTP_SOCKET_LOCK(so, 0);
4253                                 SCTP_TCB_LOCK(stcb);
4254                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4255                         }
4256 #endif
4257                         SCTP_STAT_INCR(sctps_sendpackets);
4258                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4259                         if (ret)
4260                                 SCTP_STAT_INCR(sctps_senderrors);
4261
4262                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4263                         if (net == NULL) {
4264                                 /* free tempy routes */
4265                                 RO_RTFREE(ro);
4266                         } else {
4267                                 /* PMTU check versus smallest asoc MTU goes
4268                                  * here */
4269                                 if ((ro->ro_rt != NULL) &&
4270                                     (net->ro._s_addr)) {
4271                                         uint32_t mtu;
4272
4273                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4274                                         if (net->port) {
4275                                                 mtu -= sizeof(struct udphdr);
4276                                         }
4277                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4278                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4279                                                 net->mtu = mtu;
4280                                         }
4281                                 } else if (ro->ro_rt == NULL) {
4282                                         /* route was freed */
4283                                         if (net->ro._s_addr &&
4284                                             net->src_addr_selected) {
4285                                                 sctp_free_ifa(net->ro._s_addr);
4286                                                 net->ro._s_addr = NULL;
4287                                         }
4288                                         net->src_addr_selected = 0;
4289                                 }
4290                         }
4291                         return (ret);
4292                 }
4293 #endif
4294 #ifdef INET6
4295         case AF_INET6:
4296                 {
4297                         uint32_t flowlabel, flowinfo;
4298                         struct ip6_hdr *ip6h;
4299                         struct route_in6 ip6route;
4300                         struct ifnet *ifp;
4301                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4302                         int prev_scope = 0;
4303                         struct sockaddr_in6 lsa6_storage;
4304                         int error;
4305                         u_short prev_port = 0;
4306                         int len;
4307
4308                         if (net) {
4309                                 flowlabel = net->flowlabel;
4310                         } else if (stcb) {
4311                                 flowlabel = stcb->asoc.default_flowlabel;
4312                         } else {
4313                                 flowlabel = inp->sctp_ep.default_flowlabel;
4314                         }
4315                         if (flowlabel == 0) {
4316                                 /*
4317                                  * This means especially, that it is not set
4318                                  * at the SCTP layer. So use the value from
4319                                  * the IP layer.
4320                                  */
4321                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4322                         }
4323                         flowlabel &= 0x000fffff;
4324                         len = SCTP_MIN_OVERHEAD;
4325                         if (port) {
4326                                 len += sizeof(struct udphdr);
4327                         }
4328                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4329                         if (newm == NULL) {
4330                                 sctp_m_freem(m);
4331                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4332                                 return (ENOMEM);
4333                         }
4334                         SCTP_ALIGN_TO_END(newm, len);
4335                         SCTP_BUF_LEN(newm) = len;
4336                         SCTP_BUF_NEXT(newm) = m;
4337                         m = newm;
4338                         if (net != NULL) {
4339                                 m->m_pkthdr.flowid = net->flowid;
4340                                 M_HASHTYPE_SET(m, net->flowtype);
4341                         } else {
4342                                 m->m_pkthdr.flowid = mflowid;
4343                                 M_HASHTYPE_SET(m, mflowtype);
4344                         }
4345                         packet_length = sctp_calculate_len(m);
4346
4347                         ip6h = mtod(m, struct ip6_hdr *);
4348                         /* protect *sin6 from overwrite */
4349                         sin6 = (struct sockaddr_in6 *)to;
4350                         tmp = *sin6;
4351                         sin6 = &tmp;
4352
4353                         /* KAME hack: embed scopeid */
4354                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4355                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4356                                 return (EINVAL);
4357                         }
4358                         if (net == NULL) {
4359                                 memset(&ip6route, 0, sizeof(ip6route));
4360                                 ro = (sctp_route_t *) & ip6route;
4361                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4362                         } else {
4363                                 ro = (sctp_route_t *) & net->ro;
4364                         }
4365                         /*
4366                          * We assume here that inp_flow is in host byte
4367                          * order within the TCB!
4368                          */
4369                         if (tos_value == 0) {
4370                                 /*
4371                                  * This means especially, that it is not set
4372                                  * at the SCTP layer. So use the value from
4373                                  * the IP layer.
4374                                  */
4375                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4376                         }
4377                         tos_value &= 0xfc;
4378                         if (ecn_ok) {
4379                                 tos_value |= sctp_get_ect(stcb);
4380                         }
4381                         flowinfo = 0x06;
4382                         flowinfo <<= 8;
4383                         flowinfo |= tos_value;
4384                         flowinfo <<= 20;
4385                         flowinfo |= flowlabel;
4386                         ip6h->ip6_flow = htonl(flowinfo);
4387                         if (port) {
4388                                 ip6h->ip6_nxt = IPPROTO_UDP;
4389                         } else {
4390                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4391                         }
4392                         ip6h->ip6_plen = (uint16_t) (packet_length - sizeof(struct ip6_hdr));
4393                         ip6h->ip6_dst = sin6->sin6_addr;
4394
4395                         /*
4396                          * Add SRC address selection here: we can only reuse
4397                          * to a limited degree the kame src-addr-sel, since
4398                          * we can try their selection but it may not be
4399                          * bound.
4400                          */
4401                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4402                         lsa6_tmp.sin6_family = AF_INET6;
4403                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4404                         lsa6 = &lsa6_tmp;
4405                         if (net && out_of_asoc_ok == 0) {
4406                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4407                                         sctp_free_ifa(net->ro._s_addr);
4408                                         net->ro._s_addr = NULL;
4409                                         net->src_addr_selected = 0;
4410                                         if (ro->ro_rt) {
4411                                                 RTFREE(ro->ro_rt);
4412                                                 ro->ro_rt = NULL;
4413                                         }
4414                                 }
4415                                 if (net->src_addr_selected == 0) {
4416                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4417                                         /* KAME hack: embed scopeid */
4418                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4419                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4420                                                 return (EINVAL);
4421                                         }
4422                                         /* Cache the source address */
4423                                         net->ro._s_addr = sctp_source_address_selection(inp,
4424                                             stcb,
4425                                             ro,
4426                                             net,
4427                                             0,
4428                                             vrf_id);
4429                                         (void)sa6_recoverscope(sin6);
4430                                         net->src_addr_selected = 1;
4431                                 }
4432                                 if (net->ro._s_addr == NULL) {
4433                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4434                                         net->src_addr_selected = 0;
4435                                         sctp_handle_no_route(stcb, net, so_locked);
4436                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4437                                         sctp_m_freem(m);
4438                                         return (EHOSTUNREACH);
4439                                 }
4440                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4441                         } else {
4442                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4443                                 /* KAME hack: embed scopeid */
4444                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4445                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4446                                         return (EINVAL);
4447                                 }
4448                                 if (over_addr == NULL) {
4449                                         struct sctp_ifa *_lsrc;
4450
4451                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4452                                             net,
4453                                             out_of_asoc_ok,
4454                                             vrf_id);
4455                                         if (_lsrc == NULL) {
4456                                                 sctp_handle_no_route(stcb, net, so_locked);
4457                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4458                                                 sctp_m_freem(m);
4459                                                 return (EHOSTUNREACH);
4460                                         }
4461                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4462                                         sctp_free_ifa(_lsrc);
4463                                 } else {
4464                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4465                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4466                                 }
4467                                 (void)sa6_recoverscope(sin6);
4468                         }
4469                         lsa6->sin6_port = inp->sctp_lport;
4470
4471                         if (ro->ro_rt == NULL) {
4472                                 /*
4473                                  * src addr selection failed to find a route
4474                                  * (or valid source addr), so we can't get
4475                                  * there from here!
4476                                  */
4477                                 sctp_handle_no_route(stcb, net, so_locked);
4478                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4479                                 sctp_m_freem(m);
4480                                 return (EHOSTUNREACH);
4481                         }
4482                         /*
4483                          * XXX: sa6 may not have a valid sin6_scope_id in
4484                          * the non-SCOPEDROUTING case.
4485                          */
4486                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4487                         lsa6_storage.sin6_family = AF_INET6;
4488                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4489                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4490                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4491                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4492                                 sctp_m_freem(m);
4493                                 return (error);
4494                         }
4495                         /* XXX */
4496                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4497                         lsa6_storage.sin6_port = inp->sctp_lport;
4498                         lsa6 = &lsa6_storage;
4499                         ip6h->ip6_src = lsa6->sin6_addr;
4500
4501                         if (port) {
4502                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4503                                         sctp_handle_no_route(stcb, net, so_locked);
4504                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4505                                         sctp_m_freem(m);
4506                                         return (EHOSTUNREACH);
4507                                 }
4508                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4509                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4510                                 udp->uh_dport = port;
4511                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip6_hdr)));
4512                                 udp->uh_sum = 0;
4513                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4514                         } else {
4515                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4516                         }
4517
4518                         sctphdr->src_port = src_port;
4519                         sctphdr->dest_port = dest_port;
4520                         sctphdr->v_tag = v_tag;
4521                         sctphdr->checksum = 0;
4522
4523                         /*
4524                          * We set the hop limit now since there is a good
4525                          * chance that our ro pointer is now filled
4526                          */
4527                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4528                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4529
4530 #ifdef SCTP_DEBUG
4531                         /* Copy to be sure something bad is not happening */
4532                         sin6->sin6_addr = ip6h->ip6_dst;
4533                         lsa6->sin6_addr = ip6h->ip6_src;
4534 #endif
4535
4536                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4537                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4538                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4539                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4540                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4541                         if (net) {
4542                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4543                                 /* preserve the port and scope for link
4544                                  * local send */
4545                                 prev_scope = sin6->sin6_scope_id;
4546                                 prev_port = sin6->sin6_port;
4547                         }
4548                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4549                                 /* failed to prepend data, give up */
4550                                 sctp_m_freem(m);
4551                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4552                                 return (ENOMEM);
4553                         }
4554                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4555                         if (port) {
4556 #if defined(SCTP_WITH_NO_CSUM)
4557                                 SCTP_STAT_INCR(sctps_sendnocrc);
4558 #else
4559                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4560                                 SCTP_STAT_INCR(sctps_sendswcrc);
4561 #endif
4562                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4563                                         udp->uh_sum = 0xffff;
4564                                 }
4565                         } else {
4566 #if defined(SCTP_WITH_NO_CSUM)
4567                                 SCTP_STAT_INCR(sctps_sendnocrc);
4568 #else
4569                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4570                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4571                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4572 #endif
4573                         }
4574                         /* send it out. table id is taken from stcb */
4575 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4576                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4577                                 so = SCTP_INP_SO(inp);
4578                                 SCTP_SOCKET_UNLOCK(so, 0);
4579                         }
4580 #endif
4581 #ifdef SCTP_PACKET_LOGGING
4582                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4583                                 sctp_packet_log(o_pak);
4584 #endif
4585                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4586 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4587                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4588                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4589                                 SCTP_TCB_UNLOCK(stcb);
4590                                 SCTP_SOCKET_LOCK(so, 0);
4591                                 SCTP_TCB_LOCK(stcb);
4592                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4593                         }
4594 #endif
4595                         if (net) {
4596                                 /* for link local this must be done */
4597                                 sin6->sin6_scope_id = prev_scope;
4598                                 sin6->sin6_port = prev_port;
4599                         }
4600                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4601                         SCTP_STAT_INCR(sctps_sendpackets);
4602                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4603                         if (ret) {
4604                                 SCTP_STAT_INCR(sctps_senderrors);
4605                         }
4606                         if (net == NULL) {
4607                                 /* Now if we had a temp route free it */
4608                                 RO_RTFREE(ro);
4609                         } else {
4610                                 /* PMTU check versus smallest asoc MTU goes
4611                                  * here */
4612                                 if (ro->ro_rt == NULL) {
4613                                         /* Route was freed */
4614                                         if (net->ro._s_addr &&
4615                                             net->src_addr_selected) {
4616                                                 sctp_free_ifa(net->ro._s_addr);
4617                                                 net->ro._s_addr = NULL;
4618                                         }
4619                                         net->src_addr_selected = 0;
4620                                 }
4621                                 if ((ro->ro_rt != NULL) &&
4622                                     (net->ro._s_addr)) {
4623                                         uint32_t mtu;
4624
4625                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4626                                         if (mtu &&
4627                                             (stcb->asoc.smallest_mtu > mtu)) {
4628                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4629                                                 net->mtu = mtu;
4630                                                 if (net->port) {
4631                                                         net->mtu -= sizeof(struct udphdr);
4632                                                 }
4633                                         }
4634                                 } else if (ifp) {
4635                                         if (ND_IFINFO(ifp)->linkmtu &&
4636                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4637                                                 sctp_mtu_size_reset(inp,
4638                                                     &stcb->asoc,
4639                                                     ND_IFINFO(ifp)->linkmtu);
4640                                         }
4641                                 }
4642                         }
4643                         return (ret);
4644                 }
4645 #endif
4646         default:
4647                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4648                     ((struct sockaddr *)to)->sa_family);
4649                 sctp_m_freem(m);
4650                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4651                 return (EFAULT);
4652         }
4653 }
4654
4655
4656 void
4657 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4658 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4659     SCTP_UNUSED
4660 #endif
4661 )
4662 {
4663         struct mbuf *m, *m_last;
4664         struct sctp_nets *net;
4665         struct sctp_init_chunk *init;
4666         struct sctp_supported_addr_param *sup_addr;
4667         struct sctp_adaptation_layer_indication *ali;
4668         struct sctp_supported_chunk_types_param *pr_supported;
4669         struct sctp_paramhdr *ph;
4670         int cnt_inits_to = 0;
4671         int ret;
4672         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4673
4674         /* INIT's always go to the primary (and usually ONLY address) */
4675         net = stcb->asoc.primary_destination;
4676         if (net == NULL) {
4677                 net = TAILQ_FIRST(&stcb->asoc.nets);
4678                 if (net == NULL) {
4679                         /* TSNH */
4680                         return;
4681                 }
4682                 /* we confirm any address we send an INIT to */
4683                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4684                 (void)sctp_set_primary_addr(stcb, NULL, net);
4685         } else {
4686                 /* we confirm any address we send an INIT to */
4687                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4688         }
4689         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4690 #ifdef INET6
4691         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4692                 /*
4693                  * special hook, if we are sending to link local it will not
4694                  * show up in our private address count.
4695                  */
4696                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4697                         cnt_inits_to = 1;
4698         }
4699 #endif
4700         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4701                 /* This case should not happen */
4702                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4703                 return;
4704         }
4705         /* start the INIT timer */
4706         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4707
4708         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4709         if (m == NULL) {
4710                 /* No memory, INIT timer will re-attempt. */
4711                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4712                 return;
4713         }
4714         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4715         padding_len = 0;
4716         /* Now lets put the chunk header in place */
4717         init = mtod(m, struct sctp_init_chunk *);
4718         /* now the chunk header */
4719         init->ch.chunk_type = SCTP_INITIATION;
4720         init->ch.chunk_flags = 0;
4721         /* fill in later from mbuf we build */
4722         init->ch.chunk_length = 0;
4723         /* place in my tag */
4724         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4725         /* set up some of the credits. */
4726         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4727             SCTP_MINIMAL_RWND));
4728         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4729         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4730         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4731
4732         /* Adaptation layer indication parameter */
4733         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4734                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4735                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4736                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4737                 ali->ph.param_length = htons(parameter_len);
4738                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4739                 chunk_len += parameter_len;
4740         }
4741         /* ECN parameter */
4742         if (stcb->asoc.ecn_supported == 1) {
4743                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4744                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4745                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4746                 ph->param_length = htons(parameter_len);
4747                 chunk_len += parameter_len;
4748         }
4749         /* PR-SCTP supported parameter */
4750         if (stcb->asoc.prsctp_supported == 1) {
4751                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4752                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4753                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4754                 ph->param_length = htons(parameter_len);
4755                 chunk_len += parameter_len;
4756         }
4757         /* Add NAT friendly parameter. */
4758         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4759                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4760                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4761                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4762                 ph->param_length = htons(parameter_len);
4763                 chunk_len += parameter_len;
4764         }
4765         /* And now tell the peer which extensions we support */
4766         num_ext = 0;
4767         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4768         if (stcb->asoc.prsctp_supported == 1) {
4769                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4770                 if (stcb->asoc.idata_supported) {
4771                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4772                 }
4773         }
4774         if (stcb->asoc.auth_supported == 1) {
4775                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4776         }
4777         if (stcb->asoc.asconf_supported == 1) {
4778                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4779                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4780         }
4781         if (stcb->asoc.reconfig_supported == 1) {
4782                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4783         }
4784         if (stcb->asoc.idata_supported) {
4785                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4786         }
4787         if (stcb->asoc.nrsack_supported == 1) {
4788                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4789         }
4790         if (stcb->asoc.pktdrop_supported == 1) {
4791                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4792         }
4793         if (num_ext > 0) {
4794                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4795                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4796                 pr_supported->ph.param_length = htons(parameter_len);
4797                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4798                 chunk_len += parameter_len;
4799         }
4800         /* add authentication parameters */
4801         if (stcb->asoc.auth_supported) {
4802                 /* attach RANDOM parameter, if available */
4803                 if (stcb->asoc.authinfo.random != NULL) {
4804                         struct sctp_auth_random *randp;
4805
4806                         if (padding_len > 0) {
4807                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4808                                 chunk_len += padding_len;
4809                                 padding_len = 0;
4810                         }
4811                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4812                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4813                         /* random key already contains the header */
4814                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4815                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4816                         chunk_len += parameter_len;
4817                 }
4818                 /* add HMAC_ALGO parameter */
4819                 if (stcb->asoc.local_hmacs != NULL) {
4820                         struct sctp_auth_hmac_algo *hmacs;
4821
4822                         if (padding_len > 0) {
4823                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4824                                 chunk_len += padding_len;
4825                                 padding_len = 0;
4826                         }
4827                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4828                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4829                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4830                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4831                         hmacs->ph.param_length = htons(parameter_len);
4832                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4833                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4834                         chunk_len += parameter_len;
4835                 }
4836                 /* add CHUNKS parameter */
4837                 if (stcb->asoc.local_auth_chunks != NULL) {
4838                         struct sctp_auth_chunk_list *chunks;
4839
4840                         if (padding_len > 0) {
4841                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4842                                 chunk_len += padding_len;
4843                                 padding_len = 0;
4844                         }
4845                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4846                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4847                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4848                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4849                         chunks->ph.param_length = htons(parameter_len);
4850                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4851                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4852                         chunk_len += parameter_len;
4853                 }
4854         }
4855         /* now any cookie time extensions */
4856         if (stcb->asoc.cookie_preserve_req) {
4857                 struct sctp_cookie_perserve_param *cookie_preserve;
4858
4859                 if (padding_len > 0) {
4860                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4861                         chunk_len += padding_len;
4862                         padding_len = 0;
4863                 }
4864                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4865                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4866                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4867                 cookie_preserve->ph.param_length = htons(parameter_len);
4868                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4869                 stcb->asoc.cookie_preserve_req = 0;
4870                 chunk_len += parameter_len;
4871         }
4872         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4873                 uint8_t i;
4874
4875                 if (padding_len > 0) {
4876                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4877                         chunk_len += padding_len;
4878                         padding_len = 0;
4879                 }
4880                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4881                 if (stcb->asoc.scope.ipv4_addr_legal) {
4882                         parameter_len += (uint16_t) sizeof(uint16_t);
4883                 }
4884                 if (stcb->asoc.scope.ipv6_addr_legal) {
4885                         parameter_len += (uint16_t) sizeof(uint16_t);
4886                 }
4887                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4888                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4889                 sup_addr->ph.param_length = htons(parameter_len);
4890                 i = 0;
4891                 if (stcb->asoc.scope.ipv4_addr_legal) {
4892                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4893                 }
4894                 if (stcb->asoc.scope.ipv6_addr_legal) {
4895                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4896                 }
4897                 padding_len = 4 - 2 * i;
4898                 chunk_len += parameter_len;
4899         }
4900         SCTP_BUF_LEN(m) = chunk_len;
4901         /* now the addresses */
4902         /*
4903          * To optimize this we could put the scoping stuff into a structure
4904          * and remove the individual uint8's from the assoc structure. Then
4905          * we could just sifa in the address within the stcb. But for now
4906          * this is a quick hack to get the address stuff teased apart.
4907          */
4908         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4909             m, cnt_inits_to,
4910             &padding_len, &chunk_len);
4911
4912         init->ch.chunk_length = htons(chunk_len);
4913         if (padding_len > 0) {
4914                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4915                         sctp_m_freem(m);
4916                         return;
4917                 }
4918         }
4919         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4920         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4921             (struct sockaddr *)&net->ro._l_addr,
4922             m, 0, NULL, 0, 0, 0, 0,
4923             inp->sctp_lport, stcb->rport, htonl(0),
4924             net->port, NULL,
4925             0, 0,
4926             so_locked);
4927         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4928         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4929         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4930 }
4931
4932 struct mbuf *
4933 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4934     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4935 {
4936         /*
4937          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4938          * being equal to the beginning of the params i.e. (iphlen +
4939          * sizeof(struct sctp_init_msg) parse through the parameters to the
4940          * end of the mbuf verifying that all parameters are known.
4941          *
4942          * For unknown parameters build and return a mbuf with
4943          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4944          * processing this chunk stop, and set *abort_processing to 1.
4945          *
4946          * By having param_offset be pre-set to where parameters begin it is
4947          * hoped that this routine may be reused in the future by new
4948          * features.
4949          */
4950         struct sctp_paramhdr *phdr, params;
4951
4952         struct mbuf *mat, *op_err;
4953         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4954         int at, limit, pad_needed;
4955         uint16_t ptype, plen, padded_size;
4956         int err_at;
4957
4958         *abort_processing = 0;
4959         mat = in_initpkt;
4960         err_at = 0;
4961         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4962         at = param_offset;
4963         op_err = NULL;
4964         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4965         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4966         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4967                 ptype = ntohs(phdr->param_type);
4968                 plen = ntohs(phdr->param_length);
4969                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4970                         /* wacked parameter */
4971                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4972                         goto invalid_size;
4973                 }
4974                 limit -= SCTP_SIZE32(plen);
4975                 /*-
4976                  * All parameters for all chunks that we know/understand are
4977                  * listed here. We process them other places and make
4978                  * appropriate stop actions per the upper bits. However this
4979                  * is the generic routine processor's can call to get back
4980                  * an operr.. to either incorporate (init-ack) or send.
4981                  */
4982                 padded_size = SCTP_SIZE32(plen);
4983                 switch (ptype) {
4984                         /* Param's with variable size */
4985                 case SCTP_HEARTBEAT_INFO:
4986                 case SCTP_STATE_COOKIE:
4987                 case SCTP_UNRECOG_PARAM:
4988                 case SCTP_ERROR_CAUSE_IND:
4989                         /* ok skip fwd */
4990                         at += padded_size;
4991                         break;
4992                         /* Param's with variable size within a range */
4993                 case SCTP_CHUNK_LIST:
4994                 case SCTP_SUPPORTED_CHUNK_EXT:
4995                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4996                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4997                                 goto invalid_size;
4998                         }
4999                         at += padded_size;
5000                         break;
5001                 case SCTP_SUPPORTED_ADDRTYPE:
5002                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5003                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5004                                 goto invalid_size;
5005                         }
5006                         at += padded_size;
5007                         break;
5008                 case SCTP_RANDOM:
5009                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5010                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5011                                 goto invalid_size;
5012                         }
5013                         at += padded_size;
5014                         break;
5015                 case SCTP_SET_PRIM_ADDR:
5016                 case SCTP_DEL_IP_ADDRESS:
5017                 case SCTP_ADD_IP_ADDRESS:
5018                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5019                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5020                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5021                                 goto invalid_size;
5022                         }
5023                         at += padded_size;
5024                         break;
5025                         /* Param's with a fixed size */
5026                 case SCTP_IPV4_ADDRESS:
5027                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5028                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5029                                 goto invalid_size;
5030                         }
5031                         at += padded_size;
5032                         break;
5033                 case SCTP_IPV6_ADDRESS:
5034                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5035                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5036                                 goto invalid_size;
5037                         }
5038                         at += padded_size;
5039                         break;
5040                 case SCTP_COOKIE_PRESERVE:
5041                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5042                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5043                                 goto invalid_size;
5044                         }
5045                         at += padded_size;
5046                         break;
5047                 case SCTP_HAS_NAT_SUPPORT:
5048                         *nat_friendly = 1;
5049                         /* fall through */
5050                 case SCTP_PRSCTP_SUPPORTED:
5051                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5053                                 goto invalid_size;
5054                         }
5055                         at += padded_size;
5056                         break;
5057                 case SCTP_ECN_CAPABLE:
5058                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5059                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5060                                 goto invalid_size;
5061                         }
5062                         at += padded_size;
5063                         break;
5064                 case SCTP_ULP_ADAPTATION:
5065                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5066                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5067                                 goto invalid_size;
5068                         }
5069                         at += padded_size;
5070                         break;
5071                 case SCTP_SUCCESS_REPORT:
5072                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_HOSTNAME_ADDRESS:
5079                         {
5080                                 /* We can NOT handle HOST NAME addresses!! */
5081                                 int l_len;
5082
5083                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5084                                 *abort_processing = 1;
5085                                 if (op_err == NULL) {
5086                                         /* Ok need to try to get a mbuf */
5087 #ifdef INET6
5088                                         l_len = SCTP_MIN_OVERHEAD;
5089 #else
5090                                         l_len = SCTP_MIN_V4_OVERHEAD;
5091 #endif
5092                                         l_len += sizeof(struct sctp_chunkhdr);
5093                                         l_len += plen;
5094                                         l_len += sizeof(struct sctp_paramhdr);
5095                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5096                                         if (op_err) {
5097                                                 SCTP_BUF_LEN(op_err) = 0;
5098                                                 /*
5099                                                  * pre-reserve space for ip
5100                                                  * and sctp header  and
5101                                                  * chunk hdr
5102                                                  */
5103 #ifdef INET6
5104                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5105 #else
5106                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5107 #endif
5108                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5109                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5110                                         }
5111                                 }
5112                                 if (op_err) {
5113                                         /* If we have space */
5114                                         struct sctp_paramhdr s;
5115
5116                                         if (err_at % 4) {
5117                                                 uint32_t cpthis = 0;
5118
5119                                                 pad_needed = 4 - (err_at % 4);
5120                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5121                                                 err_at += pad_needed;
5122                                         }
5123                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5124                                         s.param_length = htons(sizeof(s) + plen);
5125                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5126                                         err_at += sizeof(s);
5127                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5128                                         if (phdr == NULL) {
5129                                                 sctp_m_freem(op_err);
5130                                                 /*
5131                                                  * we are out of memory but
5132                                                  * we still need to have a
5133                                                  * look at what to do (the
5134                                                  * system is in trouble
5135                                                  * though).
5136                                                  */
5137                                                 return (NULL);
5138                                         }
5139                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5140                                 }
5141                                 return (op_err);
5142                                 break;
5143                         }
5144                 default:
5145                         /*
5146                          * we do not recognize the parameter figure out what
5147                          * we do.
5148                          */
5149                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5150                         if ((ptype & 0x4000) == 0x4000) {
5151                                 /* Report bit is set?? */
5152                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5153                                 if (op_err == NULL) {
5154                                         int l_len;
5155
5156                                         /* Ok need to try to get an mbuf */
5157 #ifdef INET6
5158                                         l_len = SCTP_MIN_OVERHEAD;
5159 #else
5160                                         l_len = SCTP_MIN_V4_OVERHEAD;
5161 #endif
5162                                         l_len += sizeof(struct sctp_chunkhdr);
5163                                         l_len += plen;
5164                                         l_len += sizeof(struct sctp_paramhdr);
5165                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5166                                         if (op_err) {
5167                                                 SCTP_BUF_LEN(op_err) = 0;
5168 #ifdef INET6
5169                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5170 #else
5171                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5172 #endif
5173                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5174                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5175                                         }
5176                                 }
5177                                 if (op_err) {
5178                                         /* If we have space */
5179                                         struct sctp_paramhdr s;
5180
5181                                         if (err_at % 4) {
5182                                                 uint32_t cpthis = 0;
5183
5184                                                 pad_needed = 4 - (err_at % 4);
5185                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5186                                                 err_at += pad_needed;
5187                                         }
5188                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5189                                         s.param_length = htons(sizeof(s) + plen);
5190                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5191                                         err_at += sizeof(s);
5192                                         if (plen > sizeof(tempbuf)) {
5193                                                 plen = sizeof(tempbuf);
5194                                         }
5195                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5196                                         if (phdr == NULL) {
5197                                                 sctp_m_freem(op_err);
5198                                                 /*
5199                                                  * we are out of memory but
5200                                                  * we still need to have a
5201                                                  * look at what to do (the
5202                                                  * system is in trouble
5203                                                  * though).
5204                                                  */
5205                                                 op_err = NULL;
5206                                                 goto more_processing;
5207                                         }
5208                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5209                                         err_at += plen;
5210                                 }
5211                         }
5212         more_processing:
5213                         if ((ptype & 0x8000) == 0x0000) {
5214                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5215                                 return (op_err);
5216                         } else {
5217                                 /* skip this chunk and continue processing */
5218                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5219                                 at += SCTP_SIZE32(plen);
5220                         }
5221                         break;
5222
5223                 }
5224                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5225         }
5226         return (op_err);
5227 invalid_size:
5228         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5229         *abort_processing = 1;
5230         if ((op_err == NULL) && phdr) {
5231                 int l_len;
5232 #ifdef INET6
5233                 l_len = SCTP_MIN_OVERHEAD;
5234 #else
5235                 l_len = SCTP_MIN_V4_OVERHEAD;
5236 #endif
5237                 l_len += sizeof(struct sctp_chunkhdr);
5238                 l_len += (2 * sizeof(struct sctp_paramhdr));
5239                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5240                 if (op_err) {
5241                         SCTP_BUF_LEN(op_err) = 0;
5242 #ifdef INET6
5243                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5244 #else
5245                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5246 #endif
5247                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5248                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5249                 }
5250         }
5251         if ((op_err) && phdr) {
5252                 struct sctp_paramhdr s;
5253
5254                 if (err_at % 4) {
5255                         uint32_t cpthis = 0;
5256
5257                         pad_needed = 4 - (err_at % 4);
5258                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5259                         err_at += pad_needed;
5260                 }
5261                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5262                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5263                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5264                 err_at += sizeof(s);
5265                 /* Only copy back the p-hdr that caused the issue */
5266                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5267         }
5268         return (op_err);
5269 }
5270
5271 static int
5272 sctp_are_there_new_addresses(struct sctp_association *asoc,
5273     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5274 {
5275         /*
5276          * Given a INIT packet, look through the packet to verify that there
5277          * are NO new addresses. As we go through the parameters add reports
5278          * of any un-understood parameters that require an error.  Also we
5279          * must return (1) to drop the packet if we see a un-understood
5280          * parameter that tells us to drop the chunk.
5281          */
5282         struct sockaddr *sa_touse;
5283         struct sockaddr *sa;
5284         struct sctp_paramhdr *phdr, params;
5285         uint16_t ptype, plen;
5286         uint8_t fnd;
5287         struct sctp_nets *net;
5288         int check_src;
5289 #ifdef INET
5290         struct sockaddr_in sin4, *sa4;
5291 #endif
5292 #ifdef INET6
5293         struct sockaddr_in6 sin6, *sa6;
5294 #endif
5295
5296 #ifdef INET
5297         memset(&sin4, 0, sizeof(sin4));
5298         sin4.sin_family = AF_INET;
5299         sin4.sin_len = sizeof(sin4);
5300 #endif
5301 #ifdef INET6
5302         memset(&sin6, 0, sizeof(sin6));
5303         sin6.sin6_family = AF_INET6;
5304         sin6.sin6_len = sizeof(sin6);
5305 #endif
5306         /* First what about the src address of the pkt ? */
5307         check_src = 0;
5308         switch (src->sa_family) {
5309 #ifdef INET
5310         case AF_INET:
5311                 if (asoc->scope.ipv4_addr_legal) {
5312                         check_src = 1;
5313                 }
5314                 break;
5315 #endif
5316 #ifdef INET6
5317         case AF_INET6:
5318                 if (asoc->scope.ipv6_addr_legal) {
5319                         check_src = 1;
5320                 }
5321                 break;
5322 #endif
5323         default:
5324                 /* TSNH */
5325                 break;
5326         }
5327         if (check_src) {
5328                 fnd = 0;
5329                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5330                         sa = (struct sockaddr *)&net->ro._l_addr;
5331                         if (sa->sa_family == src->sa_family) {
5332 #ifdef INET
5333                                 if (sa->sa_family == AF_INET) {
5334                                         struct sockaddr_in *src4;
5335
5336                                         sa4 = (struct sockaddr_in *)sa;
5337                                         src4 = (struct sockaddr_in *)src;
5338                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5339                                                 fnd = 1;
5340                                                 break;
5341                                         }
5342                                 }
5343 #endif
5344 #ifdef INET6
5345                                 if (sa->sa_family == AF_INET6) {
5346                                         struct sockaddr_in6 *src6;
5347
5348                                         sa6 = (struct sockaddr_in6 *)sa;
5349                                         src6 = (struct sockaddr_in6 *)src;
5350                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5351                                                 fnd = 1;
5352                                                 break;
5353                                         }
5354                                 }
5355 #endif
5356                         }
5357                 }
5358                 if (fnd == 0) {
5359                         /* New address added! no need to look further. */
5360                         return (1);
5361                 }
5362         }
5363         /* Ok so far lets munge through the rest of the packet */
5364         offset += sizeof(struct sctp_init_chunk);
5365         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5366         while (phdr) {
5367                 sa_touse = NULL;
5368                 ptype = ntohs(phdr->param_type);
5369                 plen = ntohs(phdr->param_length);
5370                 switch (ptype) {
5371 #ifdef INET
5372                 case SCTP_IPV4_ADDRESS:
5373                         {
5374                                 struct sctp_ipv4addr_param *p4, p4_buf;
5375
5376                                 phdr = sctp_get_next_param(in_initpkt, offset,
5377                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5378                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5379                                     phdr == NULL) {
5380                                         return (1);
5381                                 }
5382                                 if (asoc->scope.ipv4_addr_legal) {
5383                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5384                                         sin4.sin_addr.s_addr = p4->addr;
5385                                         sa_touse = (struct sockaddr *)&sin4;
5386                                 }
5387                                 break;
5388                         }
5389 #endif
5390 #ifdef INET6
5391                 case SCTP_IPV6_ADDRESS:
5392                         {
5393                                 struct sctp_ipv6addr_param *p6, p6_buf;
5394
5395                                 phdr = sctp_get_next_param(in_initpkt, offset,
5396                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5397                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5398                                     phdr == NULL) {
5399                                         return (1);
5400                                 }
5401                                 if (asoc->scope.ipv6_addr_legal) {
5402                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5403                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5404                                             sizeof(p6->addr));
5405                                         sa_touse = (struct sockaddr *)&sin6;
5406                                 }
5407                                 break;
5408                         }
5409 #endif
5410                 default:
5411                         sa_touse = NULL;
5412                         break;
5413                 }
5414                 if (sa_touse) {
5415                         /* ok, sa_touse points to one to check */
5416                         fnd = 0;
5417                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5418                                 sa = (struct sockaddr *)&net->ro._l_addr;
5419                                 if (sa->sa_family != sa_touse->sa_family) {
5420                                         continue;
5421                                 }
5422 #ifdef INET
5423                                 if (sa->sa_family == AF_INET) {
5424                                         sa4 = (struct sockaddr_in *)sa;
5425                                         if (sa4->sin_addr.s_addr ==
5426                                             sin4.sin_addr.s_addr) {
5427                                                 fnd = 1;
5428                                                 break;
5429                                         }
5430                                 }
5431 #endif
5432 #ifdef INET6
5433                                 if (sa->sa_family == AF_INET6) {
5434                                         sa6 = (struct sockaddr_in6 *)sa;
5435                                         if (SCTP6_ARE_ADDR_EQUAL(
5436                                             sa6, &sin6)) {
5437                                                 fnd = 1;
5438                                                 break;
5439                                         }
5440                                 }
5441 #endif
5442                         }
5443                         if (!fnd) {
5444                                 /* New addr added! no need to look further */
5445                                 return (1);
5446                         }
5447                 }
5448                 offset += SCTP_SIZE32(plen);
5449                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5450         }
5451         return (0);
5452 }
5453
5454 /*
5455  * Given a MBUF chain that was sent into us containing an INIT. Build a
5456  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5457  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5458  * message (i.e. the struct sctp_init_msg).
5459  */
5460 void
5461 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5462     struct sctp_nets *src_net, struct mbuf *init_pkt,
5463     int iphlen, int offset,
5464     struct sockaddr *src, struct sockaddr *dst,
5465     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5466     uint8_t mflowtype, uint32_t mflowid,
5467     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5468 {
5469         struct sctp_association *asoc;
5470         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5471         struct sctp_init_ack_chunk *initack;
5472         struct sctp_adaptation_layer_indication *ali;
5473         struct sctp_supported_chunk_types_param *pr_supported;
5474         struct sctp_paramhdr *ph;
5475         union sctp_sockstore *over_addr;
5476         struct sctp_scoping scp;
5477 #ifdef INET
5478         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5479         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5480         struct sockaddr_in *sin;
5481 #endif
5482 #ifdef INET6
5483         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5484         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5485         struct sockaddr_in6 *sin6;
5486 #endif
5487         struct sockaddr *to;
5488         struct sctp_state_cookie stc;
5489         struct sctp_nets *net = NULL;
5490         uint8_t *signature = NULL;
5491         int cnt_inits_to = 0;
5492         uint16_t his_limit, i_want;
5493         int abort_flag;
5494         int nat_friendly = 0;
5495         struct socket *so;
5496         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5497
5498         if (stcb) {
5499                 asoc = &stcb->asoc;
5500         } else {
5501                 asoc = NULL;
5502         }
5503         if ((asoc != NULL) &&
5504             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5505                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5506                         /*
5507                          * new addresses, out of here in non-cookie-wait
5508                          * states
5509                          *
5510                          * Send an ABORT, without the new address error
5511                          * cause. This looks no different than if no
5512                          * listener was present.
5513                          */
5514                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5515                             "Address added");
5516                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5517                             mflowtype, mflowid, inp->fibnum,
5518                             vrf_id, port);
5519                         return;
5520                 }
5521                 if (src_net != NULL && (src_net->port != port)) {
5522                         /*
5523                          * change of remote encapsulation port, out of here
5524                          * in non-cookie-wait states
5525                          *
5526                          * Send an ABORT, without an specific error cause.
5527                          * This looks no different than if no listener was
5528                          * present.
5529                          */
5530                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5531                             "Remote encapsulation port changed");
5532                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5533                             mflowtype, mflowid, inp->fibnum,
5534                             vrf_id, port);
5535                         return;
5536                 }
5537         }
5538         abort_flag = 0;
5539         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5540             (offset + sizeof(struct sctp_init_chunk)),
5541             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5542         if (abort_flag) {
5543 do_a_abort:
5544                 if (op_err == NULL) {
5545                         char msg[SCTP_DIAG_INFO_LEN];
5546
5547                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5548                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5549                             msg);
5550                 }
5551                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5552                     init_chk->init.initiate_tag, op_err,
5553                     mflowtype, mflowid, inp->fibnum,
5554                     vrf_id, port);
5555                 return;
5556         }
5557         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5558         if (m == NULL) {
5559                 /* No memory, INIT timer will re-attempt. */
5560                 if (op_err)
5561                         sctp_m_freem(op_err);
5562                 return;
5563         }
5564         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5565         padding_len = 0;
5566
5567         /*
5568          * We might not overwrite the identification[] completely and on
5569          * some platforms time_entered will contain some padding. Therefore
5570          * zero out the cookie to avoid putting uninitialized memory on the
5571          * wire.
5572          */
5573         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5574
5575         /* the time I built cookie */
5576         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5577
5578         /* populate any tie tags */
5579         if (asoc != NULL) {
5580                 /* unlock before tag selections */
5581                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5582                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5583                 stc.cookie_life = asoc->cookie_life;
5584                 net = asoc->primary_destination;
5585         } else {
5586                 stc.tie_tag_my_vtag = 0;
5587                 stc.tie_tag_peer_vtag = 0;
5588                 /* life I will award this cookie */
5589                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5590         }
5591
5592         /* copy in the ports for later check */
5593         stc.myport = sh->dest_port;
5594         stc.peerport = sh->src_port;
5595
5596         /*
5597          * If we wanted to honor cookie life extensions, we would add to
5598          * stc.cookie_life. For now we should NOT honor any extension
5599          */
5600         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5601         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5602                 stc.ipv6_addr_legal = 1;
5603                 if (SCTP_IPV6_V6ONLY(inp)) {
5604                         stc.ipv4_addr_legal = 0;
5605                 } else {
5606                         stc.ipv4_addr_legal = 1;
5607                 }
5608         } else {
5609                 stc.ipv6_addr_legal = 0;
5610                 stc.ipv4_addr_legal = 1;
5611         }
5612         stc.ipv4_scope = 0;
5613         if (net == NULL) {
5614                 to = src;
5615                 switch (dst->sa_family) {
5616 #ifdef INET
5617                 case AF_INET:
5618                         {
5619                                 /* lookup address */
5620                                 stc.address[0] = src4->sin_addr.s_addr;
5621                                 stc.address[1] = 0;
5622                                 stc.address[2] = 0;
5623                                 stc.address[3] = 0;
5624                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5625                                 /* local from address */
5626                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5627                                 stc.laddress[1] = 0;
5628                                 stc.laddress[2] = 0;
5629                                 stc.laddress[3] = 0;
5630                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5631                                 /* scope_id is only for v6 */
5632                                 stc.scope_id = 0;
5633                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5634                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5635                                         stc.ipv4_scope = 1;
5636                                 }
5637                                 /* Must use the address in this case */
5638                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5639                                         stc.loopback_scope = 1;
5640                                         stc.ipv4_scope = 1;
5641                                         stc.site_scope = 1;
5642                                         stc.local_scope = 0;
5643                                 }
5644                                 break;
5645                         }
5646 #endif
5647 #ifdef INET6
5648                 case AF_INET6:
5649                         {
5650                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5651                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5652                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5653                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5654                                         stc.loopback_scope = 1;
5655                                         stc.local_scope = 0;
5656                                         stc.site_scope = 1;
5657                                         stc.ipv4_scope = 1;
5658                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5659                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5660                                         /*
5661                                          * If the new destination or source
5662                                          * is a LINK_LOCAL we must have
5663                                          * common both site and local scope.
5664                                          * Don't set local scope though
5665                                          * since we must depend on the
5666                                          * source to be added implicitly. We
5667                                          * cannot assure just because we
5668                                          * share one link that all links are
5669                                          * common.
5670                                          */
5671                                         stc.local_scope = 0;
5672                                         stc.site_scope = 1;
5673                                         stc.ipv4_scope = 1;
5674                                         /*
5675                                          * we start counting for the private
5676                                          * address stuff at 1. since the
5677                                          * link local we source from won't
5678                                          * show up in our scoped count.
5679                                          */
5680                                         cnt_inits_to = 1;
5681                                         /* pull out the scope_id from
5682                                          * incoming pkt */
5683                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5684                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5685                                         /*
5686                                          * If the new destination or source
5687                                          * is SITE_LOCAL then we must have
5688                                          * site scope in common.
5689                                          */
5690                                         stc.site_scope = 1;
5691                                 }
5692                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5693                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5694                                 break;
5695                         }
5696 #endif
5697                 default:
5698                         /* TSNH */
5699                         goto do_a_abort;
5700                         break;
5701                 }
5702         } else {
5703                 /* set the scope per the existing tcb */
5704
5705 #ifdef INET6
5706                 struct sctp_nets *lnet;
5707 #endif
5708
5709                 stc.loopback_scope = asoc->scope.loopback_scope;
5710                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5711                 stc.site_scope = asoc->scope.site_scope;
5712                 stc.local_scope = asoc->scope.local_scope;
5713 #ifdef INET6
5714                 /* Why do we not consider IPv4 LL addresses? */
5715                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5716                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5717                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5718                                         /*
5719                                          * if we have a LL address, start
5720                                          * counting at 1.
5721                                          */
5722                                         cnt_inits_to = 1;
5723                                 }
5724                         }
5725                 }
5726 #endif
5727                 /* use the net pointer */
5728                 to = (struct sockaddr *)&net->ro._l_addr;
5729                 switch (to->sa_family) {
5730 #ifdef INET
5731                 case AF_INET:
5732                         sin = (struct sockaddr_in *)to;
5733                         stc.address[0] = sin->sin_addr.s_addr;
5734                         stc.address[1] = 0;
5735                         stc.address[2] = 0;
5736                         stc.address[3] = 0;
5737                         stc.addr_type = SCTP_IPV4_ADDRESS;
5738                         if (net->src_addr_selected == 0) {
5739                                 /*
5740                                  * strange case here, the INIT should have
5741                                  * did the selection.
5742                                  */
5743                                 net->ro._s_addr = sctp_source_address_selection(inp,
5744                                     stcb, (sctp_route_t *) & net->ro,
5745                                     net, 0, vrf_id);
5746                                 if (net->ro._s_addr == NULL)
5747                                         return;
5748
5749                                 net->src_addr_selected = 1;
5750
5751                         }
5752                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5753                         stc.laddress[1] = 0;
5754                         stc.laddress[2] = 0;
5755                         stc.laddress[3] = 0;
5756                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5757                         /* scope_id is only for v6 */
5758                         stc.scope_id = 0;
5759                         break;
5760 #endif
5761 #ifdef INET6
5762                 case AF_INET6:
5763                         sin6 = (struct sockaddr_in6 *)to;
5764                         memcpy(&stc.address, &sin6->sin6_addr,
5765                             sizeof(struct in6_addr));
5766                         stc.addr_type = SCTP_IPV6_ADDRESS;
5767                         stc.scope_id = sin6->sin6_scope_id;
5768                         if (net->src_addr_selected == 0) {
5769                                 /*
5770                                  * strange case here, the INIT should have
5771                                  * done 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                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5782                             sizeof(struct in6_addr));
5783                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5784                         break;
5785 #endif
5786                 }
5787         }
5788         /* Now lets put the SCTP header in place */
5789         initack = mtod(m, struct sctp_init_ack_chunk *);
5790         /* Save it off for quick ref */
5791         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5792         /* who are we */
5793         memcpy(stc.identification, SCTP_VERSION_STRING,
5794             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5795         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5796         /* now the chunk header */
5797         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5798         initack->ch.chunk_flags = 0;
5799         /* fill in later from mbuf we build */
5800         initack->ch.chunk_length = 0;
5801         /* place in my tag */
5802         if ((asoc != NULL) &&
5803             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5804             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5805             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5806                 /* re-use the v-tags and init-seq here */
5807                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5808                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5809         } else {
5810                 uint32_t vtag, itsn;
5811
5812                 if (hold_inp_lock) {
5813                         SCTP_INP_INCR_REF(inp);
5814                         SCTP_INP_RUNLOCK(inp);
5815                 }
5816                 if (asoc) {
5817                         atomic_add_int(&asoc->refcnt, 1);
5818                         SCTP_TCB_UNLOCK(stcb);
5819         new_tag:
5820                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5821                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5822                                 /*
5823                                  * Got a duplicate vtag on some guy behind a
5824                                  * nat make sure we don't use it.
5825                                  */
5826                                 goto new_tag;
5827                         }
5828                         initack->init.initiate_tag = htonl(vtag);
5829                         /* get a TSN to use too */
5830                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5831                         initack->init.initial_tsn = htonl(itsn);
5832                         SCTP_TCB_LOCK(stcb);
5833                         atomic_add_int(&asoc->refcnt, -1);
5834                 } else {
5835                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5836                         initack->init.initiate_tag = htonl(vtag);
5837                         /* get a TSN to use too */
5838                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5839                 }
5840                 if (hold_inp_lock) {
5841                         SCTP_INP_RLOCK(inp);
5842                         SCTP_INP_DECR_REF(inp);
5843                 }
5844         }
5845         /* save away my tag to */
5846         stc.my_vtag = initack->init.initiate_tag;
5847
5848         /* set up some of the credits. */
5849         so = inp->sctp_socket;
5850         if (so == NULL) {
5851                 /* memory problem */
5852                 sctp_m_freem(m);
5853                 return;
5854         } else {
5855                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5856         }
5857         /* set what I want */
5858         his_limit = ntohs(init_chk->init.num_inbound_streams);
5859         /* choose what I want */
5860         if (asoc != NULL) {
5861                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5862                         i_want = asoc->streamoutcnt;
5863                 } else {
5864                         i_want = asoc->pre_open_streams;
5865                 }
5866         } else {
5867                 i_want = inp->sctp_ep.pre_open_stream_count;
5868         }
5869         if (his_limit < i_want) {
5870                 /* I Want more :< */
5871                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5872         } else {
5873                 /* I can have what I want :> */
5874                 initack->init.num_outbound_streams = htons(i_want);
5875         }
5876         /* tell him his limit. */
5877         initack->init.num_inbound_streams =
5878             htons(inp->sctp_ep.max_open_streams_intome);
5879
5880         /* adaptation layer indication parameter */
5881         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5882                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5883                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5884                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5885                 ali->ph.param_length = htons(parameter_len);
5886                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5887                 chunk_len += parameter_len;
5888         }
5889         /* ECN parameter */
5890         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5891             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5892                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5893                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5894                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5895                 ph->param_length = htons(parameter_len);
5896                 chunk_len += parameter_len;
5897         }
5898         /* PR-SCTP supported parameter */
5899         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5900             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5901                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5902                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5903                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5904                 ph->param_length = htons(parameter_len);
5905                 chunk_len += parameter_len;
5906         }
5907         /* Add NAT friendly parameter */
5908         if (nat_friendly) {
5909                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5910                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5911                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5912                 ph->param_length = htons(parameter_len);
5913                 chunk_len += parameter_len;
5914         }
5915         /* And now tell the peer which extensions we support */
5916         num_ext = 0;
5917         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5918         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5919             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5920                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5921                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5922                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5923                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5924                 }
5925         }
5926         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5927             ((asoc == NULL) && (inp->auth_supported == 1))) {
5928                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5929         }
5930         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5931             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5932                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5933                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5934         }
5935         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5936             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5937                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5938         }
5939         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5940             ((asoc == NULL) && (inp->idata_supported == 1))) {
5941                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5942         }
5943         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5944             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5945                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5946         }
5947         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5948             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5949                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5950         }
5951         if (num_ext > 0) {
5952                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5953                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5954                 pr_supported->ph.param_length = htons(parameter_len);
5955                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5956                 chunk_len += parameter_len;
5957         }
5958         /* add authentication parameters */
5959         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5960             ((asoc == NULL) && (inp->auth_supported == 1))) {
5961                 struct sctp_auth_random *randp;
5962                 struct sctp_auth_hmac_algo *hmacs;
5963                 struct sctp_auth_chunk_list *chunks;
5964
5965                 if (padding_len > 0) {
5966                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5967                         chunk_len += padding_len;
5968                         padding_len = 0;
5969                 }
5970                 /* generate and add RANDOM parameter */
5971                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5972                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5973                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5974                 randp->ph.param_type = htons(SCTP_RANDOM);
5975                 randp->ph.param_length = htons(parameter_len);
5976                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5977                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5978                 chunk_len += parameter_len;
5979
5980                 if (padding_len > 0) {
5981                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5982                         chunk_len += padding_len;
5983                         padding_len = 0;
5984                 }
5985                 /* add HMAC_ALGO parameter */
5986                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5987                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
5988                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5989                     (uint8_t *) hmacs->hmac_ids);
5990                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5991                 hmacs->ph.param_length = htons(parameter_len);
5992                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5993                 chunk_len += parameter_len;
5994
5995                 if (padding_len > 0) {
5996                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5997                         chunk_len += padding_len;
5998                         padding_len = 0;
5999                 }
6000                 /* add CHUNKS parameter */
6001                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6002                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
6003                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6004                     chunks->chunk_types);
6005                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6006                 chunks->ph.param_length = htons(parameter_len);
6007                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6008                 chunk_len += parameter_len;
6009         }
6010         SCTP_BUF_LEN(m) = chunk_len;
6011         m_last = m;
6012         /* now the addresses */
6013         /*
6014          * To optimize this we could put the scoping stuff into a structure
6015          * and remove the individual uint8's from the stc structure. Then we
6016          * could just sifa in the address within the stc.. but for now this
6017          * is a quick hack to get the address stuff teased apart.
6018          */
6019         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6020         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6021         scp.loopback_scope = stc.loopback_scope;
6022         scp.ipv4_local_scope = stc.ipv4_scope;
6023         scp.local_scope = stc.local_scope;
6024         scp.site_scope = stc.site_scope;
6025         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6026             cnt_inits_to,
6027             &padding_len, &chunk_len);
6028         /* padding_len can only be positive, if no addresses have been added */
6029         if (padding_len > 0) {
6030                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6031                 chunk_len += padding_len;
6032                 SCTP_BUF_LEN(m) += padding_len;
6033                 padding_len = 0;
6034         }
6035         /* tack on the operational error if present */
6036         if (op_err) {
6037                 parameter_len = 0;
6038                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6039                         parameter_len += SCTP_BUF_LEN(m_tmp);
6040                 }
6041                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6042                 SCTP_BUF_NEXT(m_last) = op_err;
6043                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6044                         m_last = SCTP_BUF_NEXT(m_last);
6045                 }
6046                 chunk_len += parameter_len;
6047         }
6048         if (padding_len > 0) {
6049                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6050                 if (m_last == NULL) {
6051                         /* Houston we have a problem, no space */
6052                         sctp_m_freem(m);
6053                         return;
6054                 }
6055                 chunk_len += padding_len;
6056                 padding_len = 0;
6057         }
6058         /* Now we must build a cookie */
6059         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6060         if (m_cookie == NULL) {
6061                 /* memory problem */
6062                 sctp_m_freem(m);
6063                 return;
6064         }
6065         /* Now append the cookie to the end and update the space/size */
6066         SCTP_BUF_NEXT(m_last) = m_cookie;
6067         parameter_len = 0;
6068         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6069                 parameter_len += SCTP_BUF_LEN(m_tmp);
6070                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6071                         m_last = m_tmp;
6072                 }
6073         }
6074         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6075         chunk_len += parameter_len;
6076
6077         /*
6078          * Place in the size, but we don't include the last pad (if any) in
6079          * the INIT-ACK.
6080          */
6081         initack->ch.chunk_length = htons(chunk_len);
6082
6083         /*
6084          * Time to sign the cookie, we don't sign over the cookie signature
6085          * though thus we set trailer.
6086          */
6087         (void)sctp_hmac_m(SCTP_HMAC,
6088             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6089             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6090             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6091         /*
6092          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6093          * here since the timer will drive a retranmission.
6094          */
6095         if (padding_len > 0) {
6096                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6097                         sctp_m_freem(m);
6098                         return;
6099                 }
6100         }
6101         if (stc.loopback_scope) {
6102                 over_addr = (union sctp_sockstore *)dst;
6103         } else {
6104                 over_addr = NULL;
6105         }
6106
6107         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6108             0, 0,
6109             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6110             port, over_addr,
6111             mflowtype, mflowid,
6112             SCTP_SO_NOT_LOCKED);
6113         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6114 }
6115
6116
6117 static void
6118 sctp_prune_prsctp(struct sctp_tcb *stcb,
6119     struct sctp_association *asoc,
6120     struct sctp_sndrcvinfo *srcv,
6121     int dataout)
6122 {
6123         int freed_spc = 0;
6124         struct sctp_tmit_chunk *chk, *nchk;
6125
6126         SCTP_TCB_LOCK_ASSERT(stcb);
6127         if ((asoc->prsctp_supported) &&
6128             (asoc->sent_queue_cnt_removeable > 0)) {
6129                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6130                         /*
6131                          * Look for chunks marked with the PR_SCTP flag AND
6132                          * the buffer space flag. If the one being sent is
6133                          * equal or greater priority then purge the old one
6134                          * and free some space.
6135                          */
6136                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6137                                 /*
6138                                  * This one is PR-SCTP AND buffer space
6139                                  * limited type
6140                                  */
6141                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6142                                         /*
6143                                          * Lower numbers equates to higher
6144                                          * priority so if the one we are
6145                                          * looking at has a larger or equal
6146                                          * priority we want to drop the data
6147                                          * and NOT retransmit it.
6148                                          */
6149                                         if (chk->data) {
6150                                                 /*
6151                                                  * We release the book_size
6152                                                  * if the mbuf is here
6153                                                  */
6154                                                 int ret_spc;
6155                                                 uint8_t sent;
6156
6157                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6158                                                         sent = 1;
6159                                                 else
6160                                                         sent = 0;
6161                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6162                                                     sent,
6163                                                     SCTP_SO_LOCKED);
6164                                                 freed_spc += ret_spc;
6165                                                 if (freed_spc >= dataout) {
6166                                                         return;
6167                                                 }
6168                                         } /* if chunk was present */
6169                                 } /* if of sufficient priority */
6170                         } /* if chunk has enabled */
6171                 }               /* tailqforeach */
6172
6173                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6174                         /* Here we must move to the sent queue and mark */
6175                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6176                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6177                                         if (chk->data) {
6178                                                 /*
6179                                                  * We release the book_size
6180                                                  * if the mbuf is here
6181                                                  */
6182                                                 int ret_spc;
6183
6184                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6185                                                     0, SCTP_SO_LOCKED);
6186
6187                                                 freed_spc += ret_spc;
6188                                                 if (freed_spc >= dataout) {
6189                                                         return;
6190                                                 }
6191                                         } /* end if chk->data */
6192                                 } /* end if right class */
6193                         } /* end if chk pr-sctp */
6194                 }               /* tailqforeachsafe (chk) */
6195         } /* if enabled in asoc */
6196 }
6197
6198 int
6199 sctp_get_frag_point(struct sctp_tcb *stcb,
6200     struct sctp_association *asoc)
6201 {
6202         int siz, ovh;
6203
6204         /*
6205          * For endpoints that have both v6 and v4 addresses we must reserve
6206          * room for the ipv6 header, for those that are only dealing with V4
6207          * we use a larger frag point.
6208          */
6209         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6210                 ovh = SCTP_MIN_OVERHEAD;
6211         } else {
6212                 ovh = SCTP_MIN_V4_OVERHEAD;
6213         }
6214         if (stcb->asoc.idata_supported) {
6215                 ovh += sizeof(struct sctp_idata_chunk);
6216         } else {
6217                 ovh += sizeof(struct sctp_data_chunk);
6218         }
6219         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6220                 siz = asoc->smallest_mtu - ovh;
6221         else
6222                 siz = (stcb->asoc.sctp_frag_point - ovh);
6223         /*
6224          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6225          */
6226         /* A data chunk MUST fit in a cluster */
6227         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6228         /* } */
6229
6230         /* adjust for an AUTH chunk if DATA requires auth */
6231         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6232                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6233
6234         if (siz % 4) {
6235                 /* make it an even word boundary please */
6236                 siz -= (siz % 4);
6237         }
6238         return (siz);
6239 }
6240
6241 static void
6242 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6243 {
6244         /*
6245          * We assume that the user wants PR_SCTP_TTL if the user provides a
6246          * positive lifetime but does not specify any PR_SCTP policy.
6247          */
6248         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6249                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6250         } else if (sp->timetolive > 0) {
6251                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6252                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6253         } else {
6254                 return;
6255         }
6256         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6257         case CHUNK_FLAGS_PR_SCTP_BUF:
6258                 /*
6259                  * Time to live is a priority stored in tv_sec when doing
6260                  * the buffer drop thing.
6261                  */
6262                 sp->ts.tv_sec = sp->timetolive;
6263                 sp->ts.tv_usec = 0;
6264                 break;
6265         case CHUNK_FLAGS_PR_SCTP_TTL:
6266                 {
6267                         struct timeval tv;
6268
6269                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6270                         tv.tv_sec = sp->timetolive / 1000;
6271                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6272                         /*
6273                          * TODO sctp_constants.h needs alternative time
6274                          * macros when _KERNEL is undefined.
6275                          */
6276                         timevaladd(&sp->ts, &tv);
6277                 }
6278                 break;
6279         case CHUNK_FLAGS_PR_SCTP_RTX:
6280                 /*
6281                  * Time to live is a the number or retransmissions stored in
6282                  * tv_sec.
6283                  */
6284                 sp->ts.tv_sec = sp->timetolive;
6285                 sp->ts.tv_usec = 0;
6286                 break;
6287         default:
6288                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6289                     "Unknown PR_SCTP policy %u.\n",
6290                     PR_SCTP_POLICY(sp->sinfo_flags));
6291                 break;
6292         }
6293 }
6294
6295 static int
6296 sctp_msg_append(struct sctp_tcb *stcb,
6297     struct sctp_nets *net,
6298     struct mbuf *m,
6299     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6300 {
6301         int error = 0;
6302         struct mbuf *at;
6303         struct sctp_stream_queue_pending *sp = NULL;
6304         struct sctp_stream_out *strm;
6305
6306         /*
6307          * Given an mbuf chain, put it into the association send queue and
6308          * place it on the wheel
6309          */
6310         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6311                 /* Invalid stream number */
6312                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6313                 error = EINVAL;
6314                 goto out_now;
6315         }
6316         if ((stcb->asoc.stream_locked) &&
6317             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6318                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6319                 error = EINVAL;
6320                 goto out_now;
6321         }
6322         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6323         /* Now can we send this? */
6324         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6325             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6326             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6327             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6328                 /* got data while shutting down */
6329                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6330                 error = ECONNRESET;
6331                 goto out_now;
6332         }
6333         sctp_alloc_a_strmoq(stcb, sp);
6334         if (sp == NULL) {
6335                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6336                 error = ENOMEM;
6337                 goto out_now;
6338         }
6339         sp->sinfo_flags = srcv->sinfo_flags;
6340         sp->timetolive = srcv->sinfo_timetolive;
6341         sp->ppid = srcv->sinfo_ppid;
6342         sp->context = srcv->sinfo_context;
6343         sp->fsn = 0;
6344         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6345                 sp->net = net;
6346                 atomic_add_int(&sp->net->ref_count, 1);
6347         } else {
6348                 sp->net = NULL;
6349         }
6350         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6351         sp->stream = srcv->sinfo_stream;
6352         sp->msg_is_complete = 1;
6353         sp->sender_all_done = 1;
6354         sp->some_taken = 0;
6355         sp->data = m;
6356         sp->tail_mbuf = NULL;
6357         sctp_set_prsctp_policy(sp);
6358         /*
6359          * We could in theory (for sendall) sifa the length in, but we would
6360          * still have to hunt through the chain since we need to setup the
6361          * tail_mbuf
6362          */
6363         sp->length = 0;
6364         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6365                 if (SCTP_BUF_NEXT(at) == NULL)
6366                         sp->tail_mbuf = at;
6367                 sp->length += SCTP_BUF_LEN(at);
6368         }
6369         if (srcv->sinfo_keynumber_valid) {
6370                 sp->auth_keyid = srcv->sinfo_keynumber;
6371         } else {
6372                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6373         }
6374         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6375                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6376                 sp->holds_key_ref = 1;
6377         }
6378         if (hold_stcb_lock == 0) {
6379                 SCTP_TCB_SEND_LOCK(stcb);
6380         }
6381         sctp_snd_sb_alloc(stcb, sp->length);
6382         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6383         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6384         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6385         m = NULL;
6386         if (hold_stcb_lock == 0) {
6387                 SCTP_TCB_SEND_UNLOCK(stcb);
6388         }
6389 out_now:
6390         if (m) {
6391                 sctp_m_freem(m);
6392         }
6393         return (error);
6394 }
6395
6396
6397 static struct mbuf *
6398 sctp_copy_mbufchain(struct mbuf *clonechain,
6399     struct mbuf *outchain,
6400     struct mbuf **endofchain,
6401     int can_take_mbuf,
6402     int sizeofcpy,
6403     uint8_t copy_by_ref)
6404 {
6405         struct mbuf *m;
6406         struct mbuf *appendchain;
6407         caddr_t cp;
6408         int len;
6409
6410         if (endofchain == NULL) {
6411                 /* error */
6412 error_out:
6413                 if (outchain)
6414                         sctp_m_freem(outchain);
6415                 return (NULL);
6416         }
6417         if (can_take_mbuf) {
6418                 appendchain = clonechain;
6419         } else {
6420                 if (!copy_by_ref &&
6421                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6422                     ) {
6423                         /* Its not in a cluster */
6424                         if (*endofchain == NULL) {
6425                                 /* lets get a mbuf cluster */
6426                                 if (outchain == NULL) {
6427                                         /* This is the general case */
6428                         new_mbuf:
6429                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6430                                         if (outchain == NULL) {
6431                                                 goto error_out;
6432                                         }
6433                                         SCTP_BUF_LEN(outchain) = 0;
6434                                         *endofchain = outchain;
6435                                         /* get the prepend space */
6436                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6437                                 } else {
6438                                         /* We really should not get a NULL
6439                                          * in endofchain */
6440                                         /* find end */
6441                                         m = outchain;
6442                                         while (m) {
6443                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6444                                                         *endofchain = m;
6445                                                         break;
6446                                                 }
6447                                                 m = SCTP_BUF_NEXT(m);
6448                                         }
6449                                         /* sanity */
6450                                         if (*endofchain == NULL) {
6451                                                 /* huh, TSNH XXX maybe we
6452                                                  * should panic */
6453                                                 sctp_m_freem(outchain);
6454                                                 goto new_mbuf;
6455                                         }
6456                                 }
6457                                 /* get the new end of length */
6458                                 len = (int)M_TRAILINGSPACE(*endofchain);
6459                         } else {
6460                                 /* how much is left at the end? */
6461                                 len = (int)M_TRAILINGSPACE(*endofchain);
6462                         }
6463                         /* Find the end of the data, for appending */
6464                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6465
6466                         /* Now lets copy it out */
6467                         if (len >= sizeofcpy) {
6468                                 /* It all fits, copy it in */
6469                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6470                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6471                         } else {
6472                                 /* fill up the end of the chain */
6473                                 if (len > 0) {
6474                                         m_copydata(clonechain, 0, len, cp);
6475                                         SCTP_BUF_LEN((*endofchain)) += len;
6476                                         /* now we need another one */
6477                                         sizeofcpy -= len;
6478                                 }
6479                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6480                                 if (m == NULL) {
6481                                         /* We failed */
6482                                         goto error_out;
6483                                 }
6484                                 SCTP_BUF_NEXT((*endofchain)) = m;
6485                                 *endofchain = m;
6486                                 cp = mtod((*endofchain), caddr_t);
6487                                 m_copydata(clonechain, len, sizeofcpy, cp);
6488                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6489                         }
6490                         return (outchain);
6491                 } else {
6492                         /* copy the old fashion way */
6493                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6494 #ifdef SCTP_MBUF_LOGGING
6495                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6496                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6497                         }
6498 #endif
6499                 }
6500         }
6501         if (appendchain == NULL) {
6502                 /* error */
6503                 if (outchain)
6504                         sctp_m_freem(outchain);
6505                 return (NULL);
6506         }
6507         if (outchain) {
6508                 /* tack on to the end */
6509                 if (*endofchain != NULL) {
6510                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6511                 } else {
6512                         m = outchain;
6513                         while (m) {
6514                                 if (SCTP_BUF_NEXT(m) == NULL) {
6515                                         SCTP_BUF_NEXT(m) = appendchain;
6516                                         break;
6517                                 }
6518                                 m = SCTP_BUF_NEXT(m);
6519                         }
6520                 }
6521                 /*
6522                  * save off the end and update the end-chain position
6523                  */
6524                 m = appendchain;
6525                 while (m) {
6526                         if (SCTP_BUF_NEXT(m) == NULL) {
6527                                 *endofchain = m;
6528                                 break;
6529                         }
6530                         m = SCTP_BUF_NEXT(m);
6531                 }
6532                 return (outchain);
6533         } else {
6534                 /* save off the end and update the end-chain position */
6535                 m = appendchain;
6536                 while (m) {
6537                         if (SCTP_BUF_NEXT(m) == NULL) {
6538                                 *endofchain = m;
6539                                 break;
6540                         }
6541                         m = SCTP_BUF_NEXT(m);
6542                 }
6543                 return (appendchain);
6544         }
6545 }
6546
6547 static int
6548 sctp_med_chunk_output(struct sctp_inpcb *inp,
6549     struct sctp_tcb *stcb,
6550     struct sctp_association *asoc,
6551     int *num_out,
6552     int *reason_code,
6553     int control_only, int from_where,
6554     struct timeval *now, int *now_filled, int frag_point, int so_locked
6555 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6556     SCTP_UNUSED
6557 #endif
6558 );
6559
6560 static void
6561 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6562     uint32_t val SCTP_UNUSED)
6563 {
6564         struct sctp_copy_all *ca;
6565         struct mbuf *m;
6566         int ret = 0;
6567         int added_control = 0;
6568         int un_sent, do_chunk_output = 1;
6569         struct sctp_association *asoc;
6570         struct sctp_nets *net;
6571
6572         ca = (struct sctp_copy_all *)ptr;
6573         if (ca->m == NULL) {
6574                 return;
6575         }
6576         if (ca->inp != inp) {
6577                 /* TSNH */
6578                 return;
6579         }
6580         if (ca->sndlen > 0) {
6581                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6582                 if (m == NULL) {
6583                         /* can't copy so we are done */
6584                         ca->cnt_failed++;
6585                         return;
6586                 }
6587 #ifdef SCTP_MBUF_LOGGING
6588                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6589                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6590                 }
6591 #endif
6592         } else {
6593                 m = NULL;
6594         }
6595         SCTP_TCB_LOCK_ASSERT(stcb);
6596         if (stcb->asoc.alternate) {
6597                 net = stcb->asoc.alternate;
6598         } else {
6599                 net = stcb->asoc.primary_destination;
6600         }
6601         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6602                 /* Abort this assoc with m as the user defined reason */
6603                 if (m != NULL) {
6604                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6605                 } else {
6606                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6607                             0, M_NOWAIT, 1, MT_DATA);
6608                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6609                 }
6610                 if (m != NULL) {
6611                         struct sctp_paramhdr *ph;
6612
6613                         ph = mtod(m, struct sctp_paramhdr *);
6614                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6615                         ph->param_length = htons((uint16_t) (sizeof(struct sctp_paramhdr) + ca->sndlen));
6616                 }
6617                 /*
6618                  * We add one here to keep the assoc from dis-appearing on
6619                  * us.
6620                  */
6621                 atomic_add_int(&stcb->asoc.refcnt, 1);
6622                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6623                 /*
6624                  * sctp_abort_an_association calls sctp_free_asoc() free
6625                  * association will NOT free it since we incremented the
6626                  * refcnt .. we do this to prevent it being freed and things
6627                  * getting tricky since we could end up (from free_asoc)
6628                  * calling inpcb_free which would get a recursive lock call
6629                  * to the iterator lock.. But as a consequence of that the
6630                  * stcb will return to us un-locked.. since free_asoc
6631                  * returns with either no TCB or the TCB unlocked, we must
6632                  * relock.. to unlock in the iterator timer :-0
6633                  */
6634                 SCTP_TCB_LOCK(stcb);
6635                 atomic_add_int(&stcb->asoc.refcnt, -1);
6636                 goto no_chunk_output;
6637         } else {
6638                 if (m) {
6639                         ret = sctp_msg_append(stcb, net, m,
6640                             &ca->sndrcv, 1);
6641                 }
6642                 asoc = &stcb->asoc;
6643                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6644                         /* shutdown this assoc */
6645                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6646                             TAILQ_EMPTY(&asoc->sent_queue) &&
6647                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6648                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6649                                         goto abort_anyway;
6650                                 }
6651                                 /* there is nothing queued to send, so I'm
6652                                  * done... */
6653                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6654                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6655                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6656                                         /* only send SHUTDOWN the first time
6657                                          * through */
6658                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6659                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6660                                         }
6661                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6662                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6663                                         sctp_stop_timers_for_shutdown(stcb);
6664                                         sctp_send_shutdown(stcb, net);
6665                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6666                                             net);
6667                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6668                                             asoc->primary_destination);
6669                                         added_control = 1;
6670                                         do_chunk_output = 0;
6671                                 }
6672                         } else {
6673                                 /*
6674                                  * we still got (or just got) data to send,
6675                                  * so set SHUTDOWN_PENDING
6676                                  */
6677                                 /*
6678                                  * XXX sockets draft says that SCTP_EOF
6679                                  * should be sent with no data.  currently,
6680                                  * we will allow user data to be sent first
6681                                  * and move to SHUTDOWN-PENDING
6682                                  */
6683                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6684                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6685                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6686                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6687                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6688                                         }
6689                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6690                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6691                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6692                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6693                                                 struct mbuf *op_err;
6694                                                 char msg[SCTP_DIAG_INFO_LEN];
6695
6696                                 abort_anyway:
6697                                                 snprintf(msg, sizeof(msg),
6698                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6699                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6700                                                     msg);
6701                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6702                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6703                                                     op_err, SCTP_SO_NOT_LOCKED);
6704                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6705                                                 goto no_chunk_output;
6706                                         }
6707                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6708                                             asoc->primary_destination);
6709                                 }
6710                         }
6711
6712                 }
6713         }
6714         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6715             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6716
6717         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6718             (stcb->asoc.total_flight > 0) &&
6719             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6720                 do_chunk_output = 0;
6721         }
6722         if (do_chunk_output)
6723                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6724         else if (added_control) {
6725                 int num_out, reason, now_filled = 0;
6726                 struct timeval now;
6727                 int frag_point;
6728
6729                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6730                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6731                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6732         }
6733 no_chunk_output:
6734         if (ret) {
6735                 ca->cnt_failed++;
6736         } else {
6737                 ca->cnt_sent++;
6738         }
6739 }
6740
6741 static void
6742 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6743 {
6744         struct sctp_copy_all *ca;
6745
6746         ca = (struct sctp_copy_all *)ptr;
6747         /*
6748          * Do a notify here? Kacheong suggests that the notify be done at
6749          * the send time.. so you would push up a notification if any send
6750          * failed. Don't know if this is feasible since the only failures we
6751          * have is "memory" related and if you cannot get an mbuf to send
6752          * the data you surely can't get an mbuf to send up to notify the
6753          * user you can't send the data :->
6754          */
6755
6756         /* now free everything */
6757         sctp_m_freem(ca->m);
6758         SCTP_FREE(ca, SCTP_M_COPYAL);
6759 }
6760
6761 static struct mbuf *
6762 sctp_copy_out_all(struct uio *uio, int len)
6763 {
6764         struct mbuf *ret, *at;
6765         int left, willcpy, cancpy, error;
6766
6767         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6768         if (ret == NULL) {
6769                 /* TSNH */
6770                 return (NULL);
6771         }
6772         left = len;
6773         SCTP_BUF_LEN(ret) = 0;
6774         /* save space for the data chunk header */
6775         cancpy = (int)M_TRAILINGSPACE(ret);
6776         willcpy = min(cancpy, left);
6777         at = ret;
6778         while (left > 0) {
6779                 /* Align data to the end */
6780                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6781                 if (error) {
6782         err_out_now:
6783                         sctp_m_freem(at);
6784                         return (NULL);
6785                 }
6786                 SCTP_BUF_LEN(at) = willcpy;
6787                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6788                 left -= willcpy;
6789                 if (left > 0) {
6790                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6791                         if (SCTP_BUF_NEXT(at) == NULL) {
6792                                 goto err_out_now;
6793                         }
6794                         at = SCTP_BUF_NEXT(at);
6795                         SCTP_BUF_LEN(at) = 0;
6796                         cancpy = (int)M_TRAILINGSPACE(at);
6797                         willcpy = min(cancpy, left);
6798                 }
6799         }
6800         return (ret);
6801 }
6802
6803 static int
6804 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6805     struct sctp_sndrcvinfo *srcv)
6806 {
6807         int ret;
6808         struct sctp_copy_all *ca;
6809
6810         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6811             SCTP_M_COPYAL);
6812         if (ca == NULL) {
6813                 sctp_m_freem(m);
6814                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6815                 return (ENOMEM);
6816         }
6817         memset(ca, 0, sizeof(struct sctp_copy_all));
6818
6819         ca->inp = inp;
6820         if (srcv) {
6821                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6822         }
6823         /*
6824          * take off the sendall flag, it would be bad if we failed to do
6825          * this :-0
6826          */
6827         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6828         /* get length and mbuf chain */
6829         if (uio) {
6830                 ca->sndlen = (int)uio->uio_resid;
6831                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6832                 if (ca->m == NULL) {
6833                         SCTP_FREE(ca, SCTP_M_COPYAL);
6834                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6835                         return (ENOMEM);
6836                 }
6837         } else {
6838                 /* Gather the length of the send */
6839                 struct mbuf *mat;
6840
6841                 ca->sndlen = 0;
6842                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6843                         ca->sndlen += SCTP_BUF_LEN(mat);
6844                 }
6845         }
6846         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6847             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6848             SCTP_ASOC_ANY_STATE,
6849             (void *)ca, 0,
6850             sctp_sendall_completes, inp, 1);
6851         if (ret) {
6852                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6853                 SCTP_FREE(ca, SCTP_M_COPYAL);
6854                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6855                 return (EFAULT);
6856         }
6857         return (0);
6858 }
6859
6860
6861 void
6862 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6863 {
6864         struct sctp_tmit_chunk *chk, *nchk;
6865
6866         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6867                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6868                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6869                         if (chk->data) {
6870                                 sctp_m_freem(chk->data);
6871                                 chk->data = NULL;
6872                         }
6873                         asoc->ctrl_queue_cnt--;
6874                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6875                 }
6876         }
6877 }
6878
6879 void
6880 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6881 {
6882         struct sctp_association *asoc;
6883         struct sctp_tmit_chunk *chk, *nchk;
6884         struct sctp_asconf_chunk *acp;
6885
6886         asoc = &stcb->asoc;
6887         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6888                 /* find SCTP_ASCONF chunk in queue */
6889                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6890                         if (chk->data) {
6891                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6892                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6893                                         /* Not Acked yet */
6894                                         break;
6895                                 }
6896                         }
6897                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6898                         if (chk->data) {
6899                                 sctp_m_freem(chk->data);
6900                                 chk->data = NULL;
6901                         }
6902                         asoc->ctrl_queue_cnt--;
6903                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6904                 }
6905         }
6906 }
6907
6908
6909 static void
6910 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6911     struct sctp_association *asoc,
6912     struct sctp_tmit_chunk **data_list,
6913     int bundle_at,
6914     struct sctp_nets *net)
6915 {
6916         int i;
6917         struct sctp_tmit_chunk *tp1;
6918
6919         for (i = 0; i < bundle_at; i++) {
6920                 /* off of the send queue */
6921                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6922                 asoc->send_queue_cnt--;
6923                 if (i > 0) {
6924                         /*
6925                          * Any chunk NOT 0 you zap the time chunk 0 gets
6926                          * zapped or set based on if a RTO measurment is
6927                          * needed.
6928                          */
6929                         data_list[i]->do_rtt = 0;
6930                 }
6931                 /* record time */
6932                 data_list[i]->sent_rcv_time = net->last_sent_time;
6933                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6934                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6935                 if (data_list[i]->whoTo == NULL) {
6936                         data_list[i]->whoTo = net;
6937                         atomic_add_int(&net->ref_count, 1);
6938                 }
6939                 /* on to the sent queue */
6940                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6941                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6942                         struct sctp_tmit_chunk *tpp;
6943
6944                         /* need to move back */
6945         back_up_more:
6946                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6947                         if (tpp == NULL) {
6948                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6949                                 goto all_done;
6950                         }
6951                         tp1 = tpp;
6952                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6953                                 goto back_up_more;
6954                         }
6955                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6956                 } else {
6957                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6958                             data_list[i],
6959                             sctp_next);
6960                 }
6961 all_done:
6962                 /* This does not lower until the cum-ack passes it */
6963                 asoc->sent_queue_cnt++;
6964                 if ((asoc->peers_rwnd <= 0) &&
6965                     (asoc->total_flight == 0) &&
6966                     (bundle_at == 1)) {
6967                         /* Mark the chunk as being a window probe */
6968                         SCTP_STAT_INCR(sctps_windowprobed);
6969                 }
6970 #ifdef SCTP_AUDITING_ENABLED
6971                 sctp_audit_log(0xC2, 3);
6972 #endif
6973                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6974                 data_list[i]->snd_count = 1;
6975                 data_list[i]->rec.data.chunk_was_revoked = 0;
6976                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6977                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6978                             data_list[i]->whoTo->flight_size,
6979                             data_list[i]->book_size,
6980                             (uint32_t) (uintptr_t) data_list[i]->whoTo,
6981                             data_list[i]->rec.data.TSN_seq);
6982                 }
6983                 sctp_flight_size_increase(data_list[i]);
6984                 sctp_total_flight_increase(stcb, data_list[i]);
6985                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6986                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6987                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6988                 }
6989                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6990                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6991                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6992                         /* SWS sender side engages */
6993                         asoc->peers_rwnd = 0;
6994                 }
6995         }
6996         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6997                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6998         }
6999 }
7000
7001 static void
7002 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7003 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7004     SCTP_UNUSED
7005 #endif
7006 )
7007 {
7008         struct sctp_tmit_chunk *chk, *nchk;
7009
7010         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7011                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7012                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7013                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7014                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7015                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7016                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7017                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7018                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7019                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7020                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7021                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7022                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7023                         /* Stray chunks must be cleaned up */
7024         clean_up_anyway:
7025                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7026                         if (chk->data) {
7027                                 sctp_m_freem(chk->data);
7028                                 chk->data = NULL;
7029                         }
7030                         asoc->ctrl_queue_cnt--;
7031                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7032                                 asoc->fwd_tsn_cnt--;
7033                         sctp_free_a_chunk(stcb, chk, so_locked);
7034                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7035                         /* special handling, we must look into the param */
7036                         if (chk != asoc->str_reset) {
7037                                 goto clean_up_anyway;
7038                         }
7039                 }
7040         }
7041 }
7042
7043
7044 static int
7045 sctp_can_we_split_this(struct sctp_tcb *stcb,
7046     uint32_t length,
7047     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7048 {
7049         /*
7050          * Make a decision on if I should split a msg into multiple parts.
7051          * This is only asked of incomplete messages.
7052          */
7053         if (eeor_on) {
7054                 /*
7055                  * If we are doing EEOR we need to always send it if its the
7056                  * entire thing, since it might be all the guy is putting in
7057                  * the hopper.
7058                  */
7059                 if (goal_mtu >= length) {
7060                         /*-
7061                          * If we have data outstanding,
7062                          * we get another chance when the sack
7063                          * arrives to transmit - wait for more data
7064                          */
7065                         if (stcb->asoc.total_flight == 0) {
7066                                 /*
7067                                  * If nothing is in flight, we zero the
7068                                  * packet counter.
7069                                  */
7070                                 return (length);
7071                         }
7072                         return (0);
7073
7074                 } else {
7075                         /* You can fill the rest */
7076                         return (goal_mtu);
7077                 }
7078         }
7079         /*-
7080          * For those strange folk that make the send buffer
7081          * smaller than our fragmentation point, we can't
7082          * get a full msg in so we have to allow splitting.
7083          */
7084         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7085                 return (length);
7086         }
7087         if ((length <= goal_mtu) ||
7088             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7089                 /* Sub-optimial residual don't split in non-eeor mode. */
7090                 return (0);
7091         }
7092         /*
7093          * If we reach here length is larger than the goal_mtu. Do we wish
7094          * to split it for the sake of packet putting together?
7095          */
7096         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7097                 /* Its ok to split it */
7098                 return (min(goal_mtu, frag_point));
7099         }
7100         /* Nope, can't split */
7101         return (0);
7102
7103 }
7104
7105 static uint32_t
7106 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7107     struct sctp_stream_out *strq,
7108     uint32_t goal_mtu,
7109     uint32_t frag_point,
7110     int *giveup,
7111     int eeor_mode,
7112     int *bail,
7113     int so_locked
7114 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7115     SCTP_UNUSED
7116 #endif
7117 )
7118 {
7119         /* Move from the stream to the send_queue keeping track of the total */
7120         struct sctp_association *asoc;
7121         struct sctp_stream_queue_pending *sp;
7122         struct sctp_tmit_chunk *chk;
7123         struct sctp_data_chunk *dchkh = NULL;
7124         struct sctp_idata_chunk *ndchkh = NULL;
7125         uint32_t to_move, length;
7126         int leading;
7127         uint8_t rcv_flags = 0;
7128         uint8_t some_taken;
7129         uint8_t send_lock_up = 0;
7130
7131         SCTP_TCB_LOCK_ASSERT(stcb);
7132         asoc = &stcb->asoc;
7133 one_more_time:
7134         /* sa_ignore FREED_MEMORY */
7135         sp = TAILQ_FIRST(&strq->outqueue);
7136         if (sp == NULL) {
7137                 if (send_lock_up == 0) {
7138                         SCTP_TCB_SEND_LOCK(stcb);
7139                         send_lock_up = 1;
7140                 }
7141                 sp = TAILQ_FIRST(&strq->outqueue);
7142                 if (sp) {
7143                         goto one_more_time;
7144                 }
7145                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7146                     (stcb->asoc.idata_supported == 0) &&
7147                     (strq->last_msg_incomplete)) {
7148                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7149                             strq->stream_no,
7150                             strq->last_msg_incomplete);
7151                         strq->last_msg_incomplete = 0;
7152                 }
7153                 to_move = 0;
7154                 if (send_lock_up) {
7155                         SCTP_TCB_SEND_UNLOCK(stcb);
7156                         send_lock_up = 0;
7157                 }
7158                 goto out_of;
7159         }
7160         if ((sp->msg_is_complete) && (sp->length == 0)) {
7161                 if (sp->sender_all_done) {
7162                         /*
7163                          * We are doing differed cleanup. Last time through
7164                          * when we took all the data the sender_all_done was
7165                          * not set.
7166                          */
7167                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7168                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7169                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7170                                     sp->sender_all_done,
7171                                     sp->length,
7172                                     sp->msg_is_complete,
7173                                     sp->put_last_out,
7174                                     send_lock_up);
7175                         }
7176                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7177                                 SCTP_TCB_SEND_LOCK(stcb);
7178                                 send_lock_up = 1;
7179                         }
7180                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7181                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7182                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7183                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7184                             (strq->chunks_on_queues == 0) &&
7185                             TAILQ_EMPTY(&strq->outqueue)) {
7186                                 stcb->asoc.trigger_reset = 1;
7187                         }
7188                         if (sp->net) {
7189                                 sctp_free_remote_addr(sp->net);
7190                                 sp->net = NULL;
7191                         }
7192                         if (sp->data) {
7193                                 sctp_m_freem(sp->data);
7194                                 sp->data = NULL;
7195                         }
7196                         sctp_free_a_strmoq(stcb, sp, so_locked);
7197                         /* we can't be locked to it */
7198                         if (send_lock_up) {
7199                                 SCTP_TCB_SEND_UNLOCK(stcb);
7200                                 send_lock_up = 0;
7201                         }
7202                         /* back to get the next msg */
7203                         goto one_more_time;
7204                 } else {
7205                         /*
7206                          * sender just finished this but still holds a
7207                          * reference
7208                          */
7209                         *giveup = 1;
7210                         to_move = 0;
7211                         goto out_of;
7212                 }
7213         } else {
7214                 /* is there some to get */
7215                 if (sp->length == 0) {
7216                         /* no */
7217                         *giveup = 1;
7218                         to_move = 0;
7219                         goto out_of;
7220                 } else if (sp->discard_rest) {
7221                         if (send_lock_up == 0) {
7222                                 SCTP_TCB_SEND_LOCK(stcb);
7223                                 send_lock_up = 1;
7224                         }
7225                         /* Whack down the size */
7226                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7227                         if ((stcb->sctp_socket != NULL) &&
7228                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7229                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7230                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7231                         }
7232                         if (sp->data) {
7233                                 sctp_m_freem(sp->data);
7234                                 sp->data = NULL;
7235                                 sp->tail_mbuf = NULL;
7236                         }
7237                         sp->length = 0;
7238                         sp->some_taken = 1;
7239                         *giveup = 1;
7240                         to_move = 0;
7241                         goto out_of;
7242                 }
7243         }
7244         some_taken = sp->some_taken;
7245 re_look:
7246         length = sp->length;
7247         if (sp->msg_is_complete) {
7248                 /* The message is complete */
7249                 to_move = min(length, frag_point);
7250                 if (to_move == length) {
7251                         /* All of it fits in the MTU */
7252                         if (sp->some_taken) {
7253                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7254                         } else {
7255                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7256                         }
7257                         sp->put_last_out = 1;
7258                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7259                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7260                         }
7261                 } else {
7262                         /* Not all of it fits, we fragment */
7263                         if (sp->some_taken == 0) {
7264                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7265                         }
7266                         sp->some_taken = 1;
7267                 }
7268         } else {
7269                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7270                 if (to_move) {
7271                         /*-
7272                          * We use a snapshot of length in case it
7273                          * is expanding during the compare.
7274                          */
7275                         uint32_t llen;
7276
7277                         llen = length;
7278                         if (to_move >= llen) {
7279                                 to_move = llen;
7280                                 if (send_lock_up == 0) {
7281                                         /*-
7282                                          * We are taking all of an incomplete msg
7283                                          * thus we need a send lock.
7284                                          */
7285                                         SCTP_TCB_SEND_LOCK(stcb);
7286                                         send_lock_up = 1;
7287                                         if (sp->msg_is_complete) {
7288                                                 /* the sender finished the
7289                                                  * msg */
7290                                                 goto re_look;
7291                                         }
7292                                 }
7293                         }
7294                         if (sp->some_taken == 0) {
7295                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7296                                 sp->some_taken = 1;
7297                         }
7298                 } else {
7299                         /* Nothing to take. */
7300                         *giveup = 1;
7301                         to_move = 0;
7302                         goto out_of;
7303                 }
7304         }
7305
7306         /* If we reach here, we can copy out a chunk */
7307         sctp_alloc_a_chunk(stcb, chk);
7308         if (chk == NULL) {
7309                 /* No chunk memory */
7310                 *giveup = 1;
7311                 to_move = 0;
7312                 goto out_of;
7313         }
7314         /*
7315          * Setup for unordered if needed by looking at the user sent info
7316          * flags.
7317          */
7318         if (sp->sinfo_flags & SCTP_UNORDERED) {
7319                 rcv_flags |= SCTP_DATA_UNORDERED;
7320         }
7321         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7322             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7323                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7324         }
7325         /* clear out the chunk before setting up */
7326         memset(chk, 0, sizeof(*chk));
7327         chk->rec.data.rcv_flags = rcv_flags;
7328
7329         if (to_move >= length) {
7330                 /* we think we can steal the whole thing */
7331                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7332                         SCTP_TCB_SEND_LOCK(stcb);
7333                         send_lock_up = 1;
7334                 }
7335                 if (to_move < sp->length) {
7336                         /* bail, it changed */
7337                         goto dont_do_it;
7338                 }
7339                 chk->data = sp->data;
7340                 chk->last_mbuf = sp->tail_mbuf;
7341                 /* register the stealing */
7342                 sp->data = sp->tail_mbuf = NULL;
7343         } else {
7344                 struct mbuf *m;
7345
7346 dont_do_it:
7347                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7348                 chk->last_mbuf = NULL;
7349                 if (chk->data == NULL) {
7350                         sp->some_taken = some_taken;
7351                         sctp_free_a_chunk(stcb, chk, so_locked);
7352                         *bail = 1;
7353                         to_move = 0;
7354                         goto out_of;
7355                 }
7356 #ifdef SCTP_MBUF_LOGGING
7357                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7358                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7359                 }
7360 #endif
7361                 /* Pull off the data */
7362                 m_adj(sp->data, to_move);
7363                 /* Now lets work our way down and compact it */
7364                 m = sp->data;
7365                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7366                         sp->data = SCTP_BUF_NEXT(m);
7367                         SCTP_BUF_NEXT(m) = NULL;
7368                         if (sp->tail_mbuf == m) {
7369                                 /*-
7370                                  * Freeing tail? TSNH since
7371                                  * we supposedly were taking less
7372                                  * than the sp->length.
7373                                  */
7374 #ifdef INVARIANTS
7375                                 panic("Huh, freing tail? - TSNH");
7376 #else
7377                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7378                                 sp->tail_mbuf = sp->data = NULL;
7379                                 sp->length = 0;
7380 #endif
7381
7382                         }
7383                         sctp_m_free(m);
7384                         m = sp->data;
7385                 }
7386         }
7387         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7388                 chk->copy_by_ref = 1;
7389         } else {
7390                 chk->copy_by_ref = 0;
7391         }
7392         /*
7393          * get last_mbuf and counts of mb usage This is ugly but hopefully
7394          * its only one mbuf.
7395          */
7396         if (chk->last_mbuf == NULL) {
7397                 chk->last_mbuf = chk->data;
7398                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7399                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7400                 }
7401         }
7402         if (to_move > length) {
7403                 /*- This should not happen either
7404                  * since we always lower to_move to the size
7405                  * of sp->length if its larger.
7406                  */
7407 #ifdef INVARIANTS
7408                 panic("Huh, how can to_move be larger?");
7409 #else
7410                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7411                 sp->length = 0;
7412 #endif
7413         } else {
7414                 atomic_subtract_int(&sp->length, to_move);
7415         }
7416         if (stcb->asoc.idata_supported == 0) {
7417                 leading = sizeof(struct sctp_data_chunk);
7418         } else {
7419                 leading = sizeof(struct sctp_idata_chunk);
7420         }
7421         if (M_LEADINGSPACE(chk->data) < leading) {
7422                 /* Not enough room for a chunk header, get some */
7423                 struct mbuf *m;
7424
7425                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7426                 if (m == NULL) {
7427                         /*
7428                          * we're in trouble here. _PREPEND below will free
7429                          * all the data if there is no leading space, so we
7430                          * must put the data back and restore.
7431                          */
7432                         if (send_lock_up == 0) {
7433                                 SCTP_TCB_SEND_LOCK(stcb);
7434                                 send_lock_up = 1;
7435                         }
7436                         if (sp->data == NULL) {
7437                                 /* unsteal the data */
7438                                 sp->data = chk->data;
7439                                 sp->tail_mbuf = chk->last_mbuf;
7440                         } else {
7441                                 struct mbuf *m_tmp;
7442
7443                                 /* reassemble the data */
7444                                 m_tmp = sp->data;
7445                                 sp->data = chk->data;
7446                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7447                         }
7448                         sp->some_taken = some_taken;
7449                         atomic_add_int(&sp->length, to_move);
7450                         chk->data = NULL;
7451                         *bail = 1;
7452                         sctp_free_a_chunk(stcb, chk, so_locked);
7453                         to_move = 0;
7454                         goto out_of;
7455                 } else {
7456                         SCTP_BUF_LEN(m) = 0;
7457                         SCTP_BUF_NEXT(m) = chk->data;
7458                         chk->data = m;
7459                         M_ALIGN(chk->data, 4);
7460                 }
7461         }
7462         if (stcb->asoc.idata_supported == 0) {
7463                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7464         } else {
7465                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
7466         }
7467         if (chk->data == NULL) {
7468                 /* HELP, TSNH since we assured it would not above? */
7469 #ifdef INVARIANTS
7470                 panic("prepend failes HELP?");
7471 #else
7472                 SCTP_PRINTF("prepend fails HELP?\n");
7473                 sctp_free_a_chunk(stcb, chk, so_locked);
7474 #endif
7475                 *bail = 1;
7476                 to_move = 0;
7477                 goto out_of;
7478         }
7479         if (stcb->asoc.idata_supported == 0) {
7480                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7481                 chk->book_size = chk->send_size = (uint16_t) (to_move + sizeof(struct sctp_data_chunk));
7482         } else {
7483                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
7484                 chk->book_size = chk->send_size = (uint16_t) (to_move + sizeof(struct sctp_idata_chunk));
7485         }
7486         chk->book_size_scale = 0;
7487         chk->sent = SCTP_DATAGRAM_UNSENT;
7488
7489         chk->flags = 0;
7490         chk->asoc = &stcb->asoc;
7491         chk->pad_inplace = 0;
7492         chk->no_fr_allowed = 0;
7493         if (stcb->asoc.idata_supported == 0) {
7494                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7495                         /* Just use 0. The receiver ignores the values. */
7496                         chk->rec.data.stream_seq = 0;
7497                 } else {
7498                         chk->rec.data.stream_seq = strq->next_mid_ordered;
7499                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7500                                 strq->next_mid_ordered++;
7501                         }
7502                 }
7503         } else {
7504                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7505                         chk->rec.data.stream_seq = strq->next_mid_unordered;
7506                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7507                                 strq->next_mid_unordered++;
7508                         }
7509                 } else {
7510                         chk->rec.data.stream_seq = strq->next_mid_ordered;
7511                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7512                                 strq->next_mid_ordered++;
7513                         }
7514                 }
7515         }
7516         chk->rec.data.stream_number = sp->stream;
7517         chk->rec.data.payloadtype = sp->ppid;
7518         chk->rec.data.context = sp->context;
7519         chk->rec.data.doing_fast_retransmit = 0;
7520
7521         chk->rec.data.timetodrop = sp->ts;
7522         chk->flags = sp->act_flags;
7523
7524         if (sp->net) {
7525                 chk->whoTo = sp->net;
7526                 atomic_add_int(&chk->whoTo->ref_count, 1);
7527         } else
7528                 chk->whoTo = NULL;
7529
7530         if (sp->holds_key_ref) {
7531                 chk->auth_keyid = sp->auth_keyid;
7532                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7533                 chk->holds_key_ref = 1;
7534         }
7535         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7536         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7537                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7538                     (uint32_t) (uintptr_t) stcb, sp->length,
7539                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7540                     chk->rec.data.TSN_seq);
7541         }
7542         if (stcb->asoc.idata_supported == 0) {
7543                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7544         } else {
7545                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7546         }
7547         /*
7548          * Put the rest of the things in place now. Size was done earlier in
7549          * previous loop prior to padding.
7550          */
7551
7552 #ifdef SCTP_ASOCLOG_OF_TSNS
7553         SCTP_TCB_LOCK_ASSERT(stcb);
7554         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7555                 asoc->tsn_out_at = 0;
7556                 asoc->tsn_out_wrapped = 1;
7557         }
7558         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7559         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7560         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7561         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7562         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7563         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7564         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7565         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7566         asoc->tsn_out_at++;
7567 #endif
7568         if (stcb->asoc.idata_supported == 0) {
7569                 dchkh->ch.chunk_type = SCTP_DATA;
7570                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7571                 dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7572                 dchkh->dp.stream_id = htons((strq->stream_no & 0x0000ffff));
7573                 dchkh->dp.stream_sequence = htons((uint16_t) chk->rec.data.stream_seq);
7574                 dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7575                 dchkh->ch.chunk_length = htons(chk->send_size);
7576         } else {
7577                 ndchkh->ch.chunk_type = SCTP_IDATA;
7578                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7579                 ndchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7580                 ndchkh->dp.stream_id = htons(strq->stream_no);
7581                 ndchkh->dp.reserved = htons(0);
7582                 ndchkh->dp.msg_id = htonl(chk->rec.data.stream_seq);
7583                 if (sp->fsn == 0)
7584                         ndchkh->dp.ppid_fsn.protocol_id = chk->rec.data.payloadtype;
7585                 else
7586                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7587                 sp->fsn++;
7588                 ndchkh->ch.chunk_length = htons(chk->send_size);
7589         }
7590         /* Now advance the chk->send_size by the actual pad needed. */
7591         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7592                 /* need a pad */
7593                 struct mbuf *lm;
7594                 int pads;
7595
7596                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7597                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7598                 if (lm != NULL) {
7599                         chk->last_mbuf = lm;
7600                         chk->pad_inplace = 1;
7601                 }
7602                 chk->send_size += pads;
7603         }
7604         if (PR_SCTP_ENABLED(chk->flags)) {
7605                 asoc->pr_sctp_cnt++;
7606         }
7607         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7608                 /* All done pull and kill the message */
7609                 if (sp->put_last_out == 0) {
7610                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7611                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7612                             sp->sender_all_done,
7613                             sp->length,
7614                             sp->msg_is_complete,
7615                             sp->put_last_out,
7616                             send_lock_up);
7617                 }
7618                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7619                         SCTP_TCB_SEND_LOCK(stcb);
7620                         send_lock_up = 1;
7621                 }
7622                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7623                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7624                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7625                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7626                     (strq->chunks_on_queues == 0) &&
7627                     TAILQ_EMPTY(&strq->outqueue)) {
7628                         stcb->asoc.trigger_reset = 1;
7629                 }
7630                 if (sp->net) {
7631                         sctp_free_remote_addr(sp->net);
7632                         sp->net = NULL;
7633                 }
7634                 if (sp->data) {
7635                         sctp_m_freem(sp->data);
7636                         sp->data = NULL;
7637                 }
7638                 sctp_free_a_strmoq(stcb, sp, so_locked);
7639         }
7640         asoc->chunks_on_out_queue++;
7641         strq->chunks_on_queues++;
7642         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7643         asoc->send_queue_cnt++;
7644 out_of:
7645         if (send_lock_up) {
7646                 SCTP_TCB_SEND_UNLOCK(stcb);
7647         }
7648         return (to_move);
7649 }
7650
7651
7652 static void
7653 sctp_fill_outqueue(struct sctp_tcb *stcb,
7654     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7655 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7656     SCTP_UNUSED
7657 #endif
7658 )
7659 {
7660         struct sctp_association *asoc;
7661         struct sctp_stream_out *strq;
7662         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7663         int giveup;
7664
7665         SCTP_TCB_LOCK_ASSERT(stcb);
7666         asoc = &stcb->asoc;
7667         switch (net->ro._l_addr.sa.sa_family) {
7668 #ifdef INET
7669         case AF_INET:
7670                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7671                 break;
7672 #endif
7673 #ifdef INET6
7674         case AF_INET6:
7675                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7676                 break;
7677 #endif
7678         default:
7679                 /* TSNH */
7680                 goal_mtu = net->mtu;
7681                 break;
7682         }
7683         /* Need an allowance for the data chunk header too */
7684         if (stcb->asoc.idata_supported == 0) {
7685                 goal_mtu -= sizeof(struct sctp_data_chunk);
7686         } else {
7687                 goal_mtu -= sizeof(struct sctp_idata_chunk);
7688         }
7689
7690         /* must make even word boundary */
7691         goal_mtu &= 0xfffffffc;
7692         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7693         while ((goal_mtu > 0) && strq) {
7694                 giveup = 0;
7695                 bail = 0;
7696                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point,
7697                     &giveup, eeor_mode, &bail, so_locked);
7698                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7699
7700                 if ((giveup) || bail) {
7701                         break;
7702                 }
7703                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7704                 if (strq == NULL) {
7705                         break;
7706                 }
7707                 total_moved += moved_how_much;
7708                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7709                 goal_mtu &= 0xfffffffc;
7710         }
7711         if (bail)
7712                 *quit_now = 1;
7713
7714         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7715
7716         if (total_moved == 0) {
7717                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7718                     (net == stcb->asoc.primary_destination)) {
7719                         /* ran dry for primary network net */
7720                         SCTP_STAT_INCR(sctps_primary_randry);
7721                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7722                         /* ran dry with CMT on */
7723                         SCTP_STAT_INCR(sctps_cmt_randry);
7724                 }
7725         }
7726 }
7727
7728 void
7729 sctp_fix_ecn_echo(struct sctp_association *asoc)
7730 {
7731         struct sctp_tmit_chunk *chk;
7732
7733         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7734                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7735                         chk->sent = SCTP_DATAGRAM_UNSENT;
7736                 }
7737         }
7738 }
7739
7740 void
7741 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7742 {
7743         struct sctp_association *asoc;
7744         struct sctp_tmit_chunk *chk;
7745         struct sctp_stream_queue_pending *sp;
7746         unsigned int i;
7747
7748         if (net == NULL) {
7749                 return;
7750         }
7751         asoc = &stcb->asoc;
7752         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7753                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7754                         if (sp->net == net) {
7755                                 sctp_free_remote_addr(sp->net);
7756                                 sp->net = NULL;
7757                         }
7758                 }
7759         }
7760         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7761                 if (chk->whoTo == net) {
7762                         sctp_free_remote_addr(chk->whoTo);
7763                         chk->whoTo = NULL;
7764                 }
7765         }
7766 }
7767
7768 int
7769 sctp_med_chunk_output(struct sctp_inpcb *inp,
7770     struct sctp_tcb *stcb,
7771     struct sctp_association *asoc,
7772     int *num_out,
7773     int *reason_code,
7774     int control_only, int from_where,
7775     struct timeval *now, int *now_filled, int frag_point, int so_locked
7776 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7777     SCTP_UNUSED
7778 #endif
7779 )
7780 {
7781         /**
7782          * Ok this is the generic chunk service queue. we must do the
7783          * following:
7784          * - Service the stream queue that is next, moving any
7785          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7786          *   LAST to the out queue in one pass) and assigning TSN's. This
7787          *   only applys though if the peer does not support NDATA. For NDATA
7788          *   chunks its ok to not send the entire message ;-)
7789          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7790          *   fomulate and send the low level chunks. Making sure to combine
7791          *   any control in the control chunk queue also.
7792          */
7793         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7794         struct mbuf *outchain, *endoutchain;
7795         struct sctp_tmit_chunk *chk, *nchk;
7796
7797         /* temp arrays for unlinking */
7798         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7799         int no_fragmentflg, error;
7800         unsigned int max_rwnd_per_dest, max_send_per_dest;
7801         int one_chunk, hbflag, skip_data_for_this_net;
7802         int asconf, cookie, no_out_cnt;
7803         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7804         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7805         int tsns_sent = 0;
7806         uint32_t auth_offset = 0;
7807         struct sctp_auth_chunk *auth = NULL;
7808         uint16_t auth_keyid;
7809         int override_ok = 1;
7810         int skip_fill_up = 0;
7811         int data_auth_reqd = 0;
7812
7813         /*
7814          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7815          * destination.
7816          */
7817         int quit_now = 0;
7818
7819         *num_out = 0;
7820         *reason_code = 0;
7821         auth_keyid = stcb->asoc.authinfo.active_keyid;
7822         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7823             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7824             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7825                 eeor_mode = 1;
7826         } else {
7827                 eeor_mode = 0;
7828         }
7829         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7830         /*
7831          * First lets prime the pump. For each destination, if there is room
7832          * in the flight size, attempt to pull an MTU's worth out of the
7833          * stream queues into the general send_queue
7834          */
7835 #ifdef SCTP_AUDITING_ENABLED
7836         sctp_audit_log(0xC2, 2);
7837 #endif
7838         SCTP_TCB_LOCK_ASSERT(stcb);
7839         hbflag = 0;
7840         if (control_only)
7841                 no_data_chunks = 1;
7842         else
7843                 no_data_chunks = 0;
7844
7845         /* Nothing to possible to send? */
7846         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7847             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7848             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7849             TAILQ_EMPTY(&asoc->send_queue) &&
7850             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7851 nothing_to_send:
7852                 *reason_code = 9;
7853                 return (0);
7854         }
7855         if (asoc->peers_rwnd == 0) {
7856                 /* No room in peers rwnd */
7857                 *reason_code = 1;
7858                 if (asoc->total_flight > 0) {
7859                         /* we are allowed one chunk in flight */
7860                         no_data_chunks = 1;
7861                 }
7862         }
7863         if (stcb->asoc.ecn_echo_cnt_onq) {
7864                 /* Record where a sack goes, if any */
7865                 if (no_data_chunks &&
7866                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7867                         /* Nothing but ECNe to send - we don't do that */
7868                         goto nothing_to_send;
7869                 }
7870                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7871                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7872                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7873                                 sack_goes_to = chk->whoTo;
7874                                 break;
7875                         }
7876                 }
7877         }
7878         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7879         if (stcb->sctp_socket)
7880                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7881         else
7882                 max_send_per_dest = 0;
7883         if (no_data_chunks == 0) {
7884                 /* How many non-directed chunks are there? */
7885                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7886                         if (chk->whoTo == NULL) {
7887                                 /*
7888                                  * We already have non-directed chunks on
7889                                  * the queue, no need to do a fill-up.
7890                                  */
7891                                 skip_fill_up = 1;
7892                                 break;
7893                         }
7894                 }
7895
7896         }
7897         if ((no_data_chunks == 0) &&
7898             (skip_fill_up == 0) &&
7899             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7900                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7901                         /*
7902                          * This for loop we are in takes in each net, if
7903                          * its's got space in cwnd and has data sent to it
7904                          * (when CMT is off) then it calls
7905                          * sctp_fill_outqueue for the net. This gets data on
7906                          * the send queue for that network.
7907                          *
7908                          * In sctp_fill_outqueue TSN's are assigned and data
7909                          * is copied out of the stream buffers. Note mostly
7910                          * copy by reference (we hope).
7911                          */
7912                         net->window_probe = 0;
7913                         if ((net != stcb->asoc.alternate) &&
7914                             ((net->dest_state & SCTP_ADDR_PF) ||
7915                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7916                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7917                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7918                                         sctp_log_cwnd(stcb, net, 1,
7919                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7920                                 }
7921                                 continue;
7922                         }
7923                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7924                             (net->flight_size == 0)) {
7925                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7926                         }
7927                         if (net->flight_size >= net->cwnd) {
7928                                 /* skip this network, no room - can't fill */
7929                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7930                                         sctp_log_cwnd(stcb, net, 3,
7931                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7932                                 }
7933                                 continue;
7934                         }
7935                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7936                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7937                         }
7938                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7939                         if (quit_now) {
7940                                 /* memory alloc failure */
7941                                 no_data_chunks = 1;
7942                                 break;
7943                         }
7944                 }
7945         }
7946         /* now service each destination and send out what we can for it */
7947         /* Nothing to send? */
7948         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7949             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7950             TAILQ_EMPTY(&asoc->send_queue)) {
7951                 *reason_code = 8;
7952                 return (0);
7953         }
7954         if (asoc->sctp_cmt_on_off > 0) {
7955                 /* get the last start point */
7956                 start_at = asoc->last_net_cmt_send_started;
7957                 if (start_at == NULL) {
7958                         /* null so to beginning */
7959                         start_at = TAILQ_FIRST(&asoc->nets);
7960                 } else {
7961                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7962                         if (start_at == NULL) {
7963                                 start_at = TAILQ_FIRST(&asoc->nets);
7964                         }
7965                 }
7966                 asoc->last_net_cmt_send_started = start_at;
7967         } else {
7968                 start_at = TAILQ_FIRST(&asoc->nets);
7969         }
7970         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7971                 if (chk->whoTo == NULL) {
7972                         if (asoc->alternate) {
7973                                 chk->whoTo = asoc->alternate;
7974                         } else {
7975                                 chk->whoTo = asoc->primary_destination;
7976                         }
7977                         atomic_add_int(&chk->whoTo->ref_count, 1);
7978                 }
7979         }
7980         old_start_at = NULL;
7981 again_one_more_time:
7982         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7983                 /* how much can we send? */
7984                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7985                 if (old_start_at && (old_start_at == net)) {
7986                         /* through list ocmpletely. */
7987                         break;
7988                 }
7989                 tsns_sent = 0xa;
7990                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7991                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7992                     (net->flight_size >= net->cwnd)) {
7993                         /*
7994                          * Nothing on control or asconf and flight is full,
7995                          * we can skip even in the CMT case.
7996                          */
7997                         continue;
7998                 }
7999                 bundle_at = 0;
8000                 endoutchain = outchain = NULL;
8001                 no_fragmentflg = 1;
8002                 one_chunk = 0;
8003                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8004                         skip_data_for_this_net = 1;
8005                 } else {
8006                         skip_data_for_this_net = 0;
8007                 }
8008                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8009 #ifdef INET
8010                 case AF_INET:
8011                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8012                         break;
8013 #endif
8014 #ifdef INET6
8015                 case AF_INET6:
8016                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8017                         break;
8018 #endif
8019                 default:
8020                         /* TSNH */
8021                         mtu = net->mtu;
8022                         break;
8023                 }
8024                 mx_mtu = mtu;
8025                 to_out = 0;
8026                 if (mtu > asoc->peers_rwnd) {
8027                         if (asoc->total_flight > 0) {
8028                                 /* We have a packet in flight somewhere */
8029                                 r_mtu = asoc->peers_rwnd;
8030                         } else {
8031                                 /* We are always allowed to send one MTU out */
8032                                 one_chunk = 1;
8033                                 r_mtu = mtu;
8034                         }
8035                 } else {
8036                         r_mtu = mtu;
8037                 }
8038                 error = 0;
8039                 /************************/
8040                 /* ASCONF transmission */
8041                 /************************/
8042                 /* Now first lets go through the asconf queue */
8043                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8044                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8045                                 continue;
8046                         }
8047                         if (chk->whoTo == NULL) {
8048                                 if (asoc->alternate == NULL) {
8049                                         if (asoc->primary_destination != net) {
8050                                                 break;
8051                                         }
8052                                 } else {
8053                                         if (asoc->alternate != net) {
8054                                                 break;
8055                                         }
8056                                 }
8057                         } else {
8058                                 if (chk->whoTo != net) {
8059                                         break;
8060                                 }
8061                         }
8062                         if (chk->data == NULL) {
8063                                 break;
8064                         }
8065                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8066                             chk->sent != SCTP_DATAGRAM_RESEND) {
8067                                 break;
8068                         }
8069                         /*
8070                          * if no AUTH is yet included and this chunk
8071                          * requires it, make sure to account for it.  We
8072                          * don't apply the size until the AUTH chunk is
8073                          * actually added below in case there is no room for
8074                          * this chunk. NOTE: we overload the use of "omtu"
8075                          * here
8076                          */
8077                         if ((auth == NULL) &&
8078                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8079                             stcb->asoc.peer_auth_chunks)) {
8080                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8081                         } else
8082                                 omtu = 0;
8083                         /* Here we do NOT factor the r_mtu */
8084                         if ((chk->send_size < (int)(mtu - omtu)) ||
8085                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8086                                 /*
8087                                  * We probably should glom the mbuf chain
8088                                  * from the chk->data for control but the
8089                                  * problem is it becomes yet one more level
8090                                  * of tracking to do if for some reason
8091                                  * output fails. Then I have got to
8092                                  * reconstruct the merged control chain.. el
8093                                  * yucko.. for now we take the easy way and
8094                                  * do the copy
8095                                  */
8096                                 /*
8097                                  * Add an AUTH chunk, if chunk requires it
8098                                  * save the offset into the chain for AUTH
8099                                  */
8100                                 if ((auth == NULL) &&
8101                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8102                                     stcb->asoc.peer_auth_chunks))) {
8103                                         outchain = sctp_add_auth_chunk(outchain,
8104                                             &endoutchain,
8105                                             &auth,
8106                                             &auth_offset,
8107                                             stcb,
8108                                             chk->rec.chunk_id.id);
8109                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8110                                 }
8111                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8112                                     (int)chk->rec.chunk_id.can_take_data,
8113                                     chk->send_size, chk->copy_by_ref);
8114                                 if (outchain == NULL) {
8115                                         *reason_code = 8;
8116                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8117                                         return (ENOMEM);
8118                                 }
8119                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8120                                 /* update our MTU size */
8121                                 if (mtu > (chk->send_size + omtu))
8122                                         mtu -= (chk->send_size + omtu);
8123                                 else
8124                                         mtu = 0;
8125                                 to_out += (chk->send_size + omtu);
8126                                 /* Do clear IP_DF ? */
8127                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8128                                         no_fragmentflg = 0;
8129                                 }
8130                                 if (chk->rec.chunk_id.can_take_data)
8131                                         chk->data = NULL;
8132                                 /*
8133                                  * set hb flag since we can use these for
8134                                  * RTO
8135                                  */
8136                                 hbflag = 1;
8137                                 asconf = 1;
8138                                 /*
8139                                  * should sysctl this: don't bundle data
8140                                  * with ASCONF since it requires AUTH
8141                                  */
8142                                 no_data_chunks = 1;
8143                                 chk->sent = SCTP_DATAGRAM_SENT;
8144                                 if (chk->whoTo == NULL) {
8145                                         chk->whoTo = net;
8146                                         atomic_add_int(&net->ref_count, 1);
8147                                 }
8148                                 chk->snd_count++;
8149                                 if (mtu == 0) {
8150                                         /*
8151                                          * Ok we are out of room but we can
8152                                          * output without effecting the
8153                                          * flight size since this little guy
8154                                          * is a control only packet.
8155                                          */
8156                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8157                                         /*
8158                                          * do NOT clear the asconf flag as
8159                                          * it is used to do appropriate
8160                                          * source address selection.
8161                                          */
8162                                         if (*now_filled == 0) {
8163                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8164                                                 *now_filled = 1;
8165                                         }
8166                                         net->last_sent_time = *now;
8167                                         hbflag = 0;
8168                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8169                                             (struct sockaddr *)&net->ro._l_addr,
8170                                             outchain, auth_offset, auth,
8171                                             stcb->asoc.authinfo.active_keyid,
8172                                             no_fragmentflg, 0, asconf,
8173                                             inp->sctp_lport, stcb->rport,
8174                                             htonl(stcb->asoc.peer_vtag),
8175                                             net->port, NULL,
8176                                             0, 0,
8177                                             so_locked))) {
8178                                                 /* error, we could not
8179                                                  * output */
8180                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8181                                                 if (from_where == 0) {
8182                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8183                                                 }
8184                                                 if (error == ENOBUFS) {
8185                                                         asoc->ifp_had_enobuf = 1;
8186                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8187                                                 }
8188                                                 /* error, could not output */
8189                                                 if (error == EHOSTUNREACH) {
8190                                                         /*
8191                                                          * Destination went
8192                                                          * unreachable
8193                                                          * during this send
8194                                                          */
8195                                                         sctp_move_chunks_from_net(stcb, net);
8196                                                 }
8197                                                 *reason_code = 7;
8198                                                 break;
8199                                         } else {
8200                                                 asoc->ifp_had_enobuf = 0;
8201                                         }
8202                                         /*
8203                                          * increase the number we sent, if a
8204                                          * cookie is sent we don't tell them
8205                                          * any was sent out.
8206                                          */
8207                                         outchain = endoutchain = NULL;
8208                                         auth = NULL;
8209                                         auth_offset = 0;
8210                                         if (!no_out_cnt)
8211                                                 *num_out += ctl_cnt;
8212                                         /* recalc a clean slate and setup */
8213                                         switch (net->ro._l_addr.sa.sa_family) {
8214 #ifdef INET
8215                                         case AF_INET:
8216                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8217                                                 break;
8218 #endif
8219 #ifdef INET6
8220                                         case AF_INET6:
8221                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8222                                                 break;
8223 #endif
8224                                         default:
8225                                                 /* TSNH */
8226                                                 mtu = net->mtu;
8227                                                 break;
8228                                         }
8229                                         to_out = 0;
8230                                         no_fragmentflg = 1;
8231                                 }
8232                         }
8233                 }
8234                 if (error != 0) {
8235                         /* try next net */
8236                         continue;
8237                 }
8238                 /************************/
8239                 /* Control transmission */
8240                 /************************/
8241                 /* Now first lets go through the control queue */
8242                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8243                         if ((sack_goes_to) &&
8244                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8245                             (chk->whoTo != sack_goes_to)) {
8246                                 /*
8247                                  * if we have a sack in queue, and we are
8248                                  * looking at an ecn echo that is NOT queued
8249                                  * to where the sack is going..
8250                                  */
8251                                 if (chk->whoTo == net) {
8252                                         /* Don't transmit it to where its
8253                                          * going (current net) */
8254                                         continue;
8255                                 } else if (sack_goes_to == net) {
8256                                         /* But do transmit it to this
8257                                          * address */
8258                                         goto skip_net_check;
8259                                 }
8260                         }
8261                         if (chk->whoTo == NULL) {
8262                                 if (asoc->alternate == NULL) {
8263                                         if (asoc->primary_destination != net) {
8264                                                 continue;
8265                                         }
8266                                 } else {
8267                                         if (asoc->alternate != net) {
8268                                                 continue;
8269                                         }
8270                                 }
8271                         } else {
8272                                 if (chk->whoTo != net) {
8273                                         continue;
8274                                 }
8275                         }
8276         skip_net_check:
8277                         if (chk->data == NULL) {
8278                                 continue;
8279                         }
8280                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8281                                 /*
8282                                  * It must be unsent. Cookies and ASCONF's
8283                                  * hang around but there timers will force
8284                                  * when marked for resend.
8285                                  */
8286                                 continue;
8287                         }
8288                         /*
8289                          * if no AUTH is yet included and this chunk
8290                          * requires it, make sure to account for it.  We
8291                          * don't apply the size until the AUTH chunk is
8292                          * actually added below in case there is no room for
8293                          * this chunk. NOTE: we overload the use of "omtu"
8294                          * here
8295                          */
8296                         if ((auth == NULL) &&
8297                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8298                             stcb->asoc.peer_auth_chunks)) {
8299                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8300                         } else
8301                                 omtu = 0;
8302                         /* Here we do NOT factor the r_mtu */
8303                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8304                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8305                                 /*
8306                                  * We probably should glom the mbuf chain
8307                                  * from the chk->data for control but the
8308                                  * problem is it becomes yet one more level
8309                                  * of tracking to do if for some reason
8310                                  * output fails. Then I have got to
8311                                  * reconstruct the merged control chain.. el
8312                                  * yucko.. for now we take the easy way and
8313                                  * do the copy
8314                                  */
8315                                 /*
8316                                  * Add an AUTH chunk, if chunk requires it
8317                                  * save the offset into the chain for AUTH
8318                                  */
8319                                 if ((auth == NULL) &&
8320                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8321                                     stcb->asoc.peer_auth_chunks))) {
8322                                         outchain = sctp_add_auth_chunk(outchain,
8323                                             &endoutchain,
8324                                             &auth,
8325                                             &auth_offset,
8326                                             stcb,
8327                                             chk->rec.chunk_id.id);
8328                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8329                                 }
8330                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8331                                     (int)chk->rec.chunk_id.can_take_data,
8332                                     chk->send_size, chk->copy_by_ref);
8333                                 if (outchain == NULL) {
8334                                         *reason_code = 8;
8335                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8336                                         return (ENOMEM);
8337                                 }
8338                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8339                                 /* update our MTU size */
8340                                 if (mtu > (chk->send_size + omtu))
8341                                         mtu -= (chk->send_size + omtu);
8342                                 else
8343                                         mtu = 0;
8344                                 to_out += (chk->send_size + omtu);
8345                                 /* Do clear IP_DF ? */
8346                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8347                                         no_fragmentflg = 0;
8348                                 }
8349                                 if (chk->rec.chunk_id.can_take_data)
8350                                         chk->data = NULL;
8351                                 /* Mark things to be removed, if needed */
8352                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8353                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8354                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8355                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8356                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8357                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8358                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8359                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8360                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8361                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8362                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8363                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8364                                                 hbflag = 1;
8365                                         }
8366                                         /* remove these chunks at the end */
8367                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8368                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8369                                                 /* turn off the timer */
8370                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8371                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8372                                                             inp, stcb, net,
8373                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8374                                                 }
8375                                         }
8376                                         ctl_cnt++;
8377                                 } else {
8378                                         /*
8379                                          * Other chunks, since they have
8380                                          * timers running (i.e. COOKIE) we
8381                                          * just "trust" that it gets sent or
8382                                          * retransmitted.
8383                                          */
8384                                         ctl_cnt++;
8385                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8386                                                 cookie = 1;
8387                                                 no_out_cnt = 1;
8388                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8389                                                 /*
8390                                                  * Increment ecne send count
8391                                                  * here this means we may be
8392                                                  * over-zealous in our
8393                                                  * counting if the send
8394                                                  * fails, but its the best
8395                                                  * place to do it (we used
8396                                                  * to do it in the queue of
8397                                                  * the chunk, but that did
8398                                                  * not tell how many times
8399                                                  * it was sent.
8400                                                  */
8401                                                 SCTP_STAT_INCR(sctps_sendecne);
8402                                         }
8403                                         chk->sent = SCTP_DATAGRAM_SENT;
8404                                         if (chk->whoTo == NULL) {
8405                                                 chk->whoTo = net;
8406                                                 atomic_add_int(&net->ref_count, 1);
8407                                         }
8408                                         chk->snd_count++;
8409                                 }
8410                                 if (mtu == 0) {
8411                                         /*
8412                                          * Ok we are out of room but we can
8413                                          * output without effecting the
8414                                          * flight size since this little guy
8415                                          * is a control only packet.
8416                                          */
8417                                         if (asconf) {
8418                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8419                                                 /*
8420                                                  * do NOT clear the asconf
8421                                                  * flag as it is used to do
8422                                                  * appropriate source
8423                                                  * address selection.
8424                                                  */
8425                                         }
8426                                         if (cookie) {
8427                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8428                                                 cookie = 0;
8429                                         }
8430                                         /* Only HB or ASCONF advances time */
8431                                         if (hbflag) {
8432                                                 if (*now_filled == 0) {
8433                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8434                                                         *now_filled = 1;
8435                                                 }
8436                                                 net->last_sent_time = *now;
8437                                                 hbflag = 0;
8438                                         }
8439                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8440                                             (struct sockaddr *)&net->ro._l_addr,
8441                                             outchain,
8442                                             auth_offset, auth,
8443                                             stcb->asoc.authinfo.active_keyid,
8444                                             no_fragmentflg, 0, asconf,
8445                                             inp->sctp_lport, stcb->rport,
8446                                             htonl(stcb->asoc.peer_vtag),
8447                                             net->port, NULL,
8448                                             0, 0,
8449                                             so_locked))) {
8450                                                 /* error, we could not
8451                                                  * output */
8452                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8453                                                 if (from_where == 0) {
8454                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8455                                                 }
8456                                                 if (error == ENOBUFS) {
8457                                                         asoc->ifp_had_enobuf = 1;
8458                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8459                                                 }
8460                                                 if (error == EHOSTUNREACH) {
8461                                                         /*
8462                                                          * Destination went
8463                                                          * unreachable
8464                                                          * during this send
8465                                                          */
8466                                                         sctp_move_chunks_from_net(stcb, net);
8467                                                 }
8468                                                 *reason_code = 7;
8469                                                 break;
8470                                         } else {
8471                                                 asoc->ifp_had_enobuf = 0;
8472                                         }
8473                                         /*
8474                                          * increase the number we sent, if a
8475                                          * cookie is sent we don't tell them
8476                                          * any was sent out.
8477                                          */
8478                                         outchain = endoutchain = NULL;
8479                                         auth = NULL;
8480                                         auth_offset = 0;
8481                                         if (!no_out_cnt)
8482                                                 *num_out += ctl_cnt;
8483                                         /* recalc a clean slate and setup */
8484                                         switch (net->ro._l_addr.sa.sa_family) {
8485 #ifdef INET
8486                                         case AF_INET:
8487                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8488                                                 break;
8489 #endif
8490 #ifdef INET6
8491                                         case AF_INET6:
8492                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8493                                                 break;
8494 #endif
8495                                         default:
8496                                                 /* TSNH */
8497                                                 mtu = net->mtu;
8498                                                 break;
8499                                         }
8500                                         to_out = 0;
8501                                         no_fragmentflg = 1;
8502                                 }
8503                         }
8504                 }
8505                 if (error != 0) {
8506                         /* try next net */
8507                         continue;
8508                 }
8509                 /* JRI: if dest is in PF state, do not send data to it */
8510                 if ((asoc->sctp_cmt_on_off > 0) &&
8511                     (net != stcb->asoc.alternate) &&
8512                     (net->dest_state & SCTP_ADDR_PF)) {
8513                         goto no_data_fill;
8514                 }
8515                 if (net->flight_size >= net->cwnd) {
8516                         goto no_data_fill;
8517                 }
8518                 if ((asoc->sctp_cmt_on_off > 0) &&
8519                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8520                     (net->flight_size > max_rwnd_per_dest)) {
8521                         goto no_data_fill;
8522                 }
8523                 /*
8524                  * We need a specific accounting for the usage of the send
8525                  * buffer. We also need to check the number of messages per
8526                  * net. For now, this is better than nothing and it disabled
8527                  * by default...
8528                  */
8529                 if ((asoc->sctp_cmt_on_off > 0) &&
8530                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8531                     (max_send_per_dest > 0) &&
8532                     (net->flight_size > max_send_per_dest)) {
8533                         goto no_data_fill;
8534                 }
8535                 /*********************/
8536                 /* Data transmission */
8537                 /*********************/
8538                 /*
8539                  * if AUTH for DATA is required and no AUTH has been added
8540                  * yet, account for this in the mtu now... if no data can be
8541                  * bundled, this adjustment won't matter anyways since the
8542                  * packet will be going out...
8543                  */
8544                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8545                     stcb->asoc.peer_auth_chunks);
8546                 if (data_auth_reqd && (auth == NULL)) {
8547                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8548                 }
8549                 /* now lets add any data within the MTU constraints */
8550                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8551 #ifdef INET
8552                 case AF_INET:
8553                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8554                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8555                         else
8556                                 omtu = 0;
8557                         break;
8558 #endif
8559 #ifdef INET6
8560                 case AF_INET6:
8561                         if (net->mtu > SCTP_MIN_OVERHEAD)
8562                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8563                         else
8564                                 omtu = 0;
8565                         break;
8566 #endif
8567                 default:
8568                         /* TSNH */
8569                         omtu = 0;
8570                         break;
8571                 }
8572                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8573                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8574                     (skip_data_for_this_net == 0)) ||
8575                     (cookie)) {
8576                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8577                                 if (no_data_chunks) {
8578                                         /* let only control go out */
8579                                         *reason_code = 1;
8580                                         break;
8581                                 }
8582                                 if (net->flight_size >= net->cwnd) {
8583                                         /* skip this net, no room for data */
8584                                         *reason_code = 2;
8585                                         break;
8586                                 }
8587                                 if ((chk->whoTo != NULL) &&
8588                                     (chk->whoTo != net)) {
8589                                         /* Don't send the chunk on this net */
8590                                         continue;
8591                                 }
8592                                 if (asoc->sctp_cmt_on_off == 0) {
8593                                         if ((asoc->alternate) &&
8594                                             (asoc->alternate != net) &&
8595                                             (chk->whoTo == NULL)) {
8596                                                 continue;
8597                                         } else if ((net != asoc->primary_destination) &&
8598                                                     (asoc->alternate == NULL) &&
8599                                             (chk->whoTo == NULL)) {
8600                                                 continue;
8601                                         }
8602                                 }
8603                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8604                                         /*-
8605                                          * strange, we have a chunk that is
8606                                          * to big for its destination and
8607                                          * yet no fragment ok flag.
8608                                          * Something went wrong when the
8609                                          * PMTU changed...we did not mark
8610                                          * this chunk for some reason?? I
8611                                          * will fix it here by letting IP
8612                                          * fragment it for now and printing
8613                                          * a warning. This really should not
8614                                          * happen ...
8615                                          */
8616                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8617                                             chk->send_size, mtu);
8618                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8619                                 }
8620                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8621                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8622                                         struct sctp_data_chunk *dchkh;
8623
8624                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8625                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8626                                 }
8627                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8628                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8629                                         /* ok we will add this one */
8630
8631                                         /*
8632                                          * Add an AUTH chunk, if chunk
8633                                          * requires it, save the offset into
8634                                          * the chain for AUTH
8635                                          */
8636                                         if (data_auth_reqd) {
8637                                                 if (auth == NULL) {
8638                                                         outchain = sctp_add_auth_chunk(outchain,
8639                                                             &endoutchain,
8640                                                             &auth,
8641                                                             &auth_offset,
8642                                                             stcb,
8643                                                             SCTP_DATA);
8644                                                         auth_keyid = chk->auth_keyid;
8645                                                         override_ok = 0;
8646                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8647                                                 } else if (override_ok) {
8648                                                         /* use this data's
8649                                                          * keyid */
8650                                                         auth_keyid = chk->auth_keyid;
8651                                                         override_ok = 0;
8652                                                 } else if (auth_keyid != chk->auth_keyid) {
8653                                                         /* different keyid,
8654                                                          * so done bundling */
8655                                                         break;
8656                                                 }
8657                                         }
8658                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8659                                             chk->send_size, chk->copy_by_ref);
8660                                         if (outchain == NULL) {
8661                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8662                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8663                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8664                                                 }
8665                                                 *reason_code = 3;
8666                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8667                                                 return (ENOMEM);
8668                                         }
8669                                         /* upate our MTU size */
8670                                         /* Do clear IP_DF ? */
8671                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8672                                                 no_fragmentflg = 0;
8673                                         }
8674                                         /* unsigned subtraction of mtu */
8675                                         if (mtu > chk->send_size)
8676                                                 mtu -= chk->send_size;
8677                                         else
8678                                                 mtu = 0;
8679                                         /* unsigned subtraction of r_mtu */
8680                                         if (r_mtu > chk->send_size)
8681                                                 r_mtu -= chk->send_size;
8682                                         else
8683                                                 r_mtu = 0;
8684
8685                                         to_out += chk->send_size;
8686                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8687 #ifdef INVARIANTS
8688                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8689 #else
8690                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8691                                                     mx_mtu, to_out);
8692 #endif
8693                                         }
8694                                         chk->window_probe = 0;
8695                                         data_list[bundle_at++] = chk;
8696                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8697                                                 break;
8698                                         }
8699                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8700                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8701                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8702                                                 } else {
8703                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8704                                                 }
8705                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8706                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8707                                                         /*
8708                                                          * Count number of
8709                                                          * user msg's that
8710                                                          * were fragmented
8711                                                          * we do this by
8712                                                          * counting when we
8713                                                          * see a LAST
8714                                                          * fragment only.
8715                                                          */
8716                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8717                                         }
8718                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8719                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8720                                                         data_list[0]->window_probe = 1;
8721                                                         net->window_probe = 1;
8722                                                 }
8723                                                 break;
8724                                         }
8725                                 } else {
8726                                         /*
8727                                          * Must be sent in order of the
8728                                          * TSN's (on a network)
8729                                          */
8730                                         break;
8731                                 }
8732                         }       /* for (chunk gather loop for this net) */
8733 } /* if asoc.state OPEN */ no_data_fill:
8734                 /* Is there something to send for this destination? */
8735                 if (outchain) {
8736                         /* We may need to start a control timer or two */
8737                         if (asconf) {
8738                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8739                                     stcb, net);
8740                                 /*
8741                                  * do NOT clear the asconf flag as it is
8742                                  * used to do appropriate source address
8743                                  * selection.
8744                                  */
8745                         }
8746                         if (cookie) {
8747                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8748                                 cookie = 0;
8749                         }
8750                         /* must start a send timer if data is being sent */
8751                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8752                                 /*
8753                                  * no timer running on this destination
8754                                  * restart it.
8755                                  */
8756                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8757                         }
8758                         if (bundle_at || hbflag) {
8759                                 /* For data/asconf and hb set time */
8760                                 if (*now_filled == 0) {
8761                                         (void)SCTP_GETTIME_TIMEVAL(now);
8762                                         *now_filled = 1;
8763                                 }
8764                                 net->last_sent_time = *now;
8765                         }
8766                         /* Now send it, if there is anything to send :> */
8767                         if ((error = sctp_lowlevel_chunk_output(inp,
8768                             stcb,
8769                             net,
8770                             (struct sockaddr *)&net->ro._l_addr,
8771                             outchain,
8772                             auth_offset,
8773                             auth,
8774                             auth_keyid,
8775                             no_fragmentflg,
8776                             bundle_at,
8777                             asconf,
8778                             inp->sctp_lport, stcb->rport,
8779                             htonl(stcb->asoc.peer_vtag),
8780                             net->port, NULL,
8781                             0, 0,
8782                             so_locked))) {
8783                                 /* error, we could not output */
8784                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8785                                 if (from_where == 0) {
8786                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8787                                 }
8788                                 if (error == ENOBUFS) {
8789                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8790                                         asoc->ifp_had_enobuf = 1;
8791                                 }
8792                                 if (error == EHOSTUNREACH) {
8793                                         /*
8794                                          * Destination went unreachable
8795                                          * during this send
8796                                          */
8797                                         sctp_move_chunks_from_net(stcb, net);
8798                                 }
8799                                 *reason_code = 6;
8800                                 /*-
8801                                  * I add this line to be paranoid. As far as
8802                                  * I can tell the continue, takes us back to
8803                                  * the top of the for, but just to make sure
8804                                  * I will reset these again here.
8805                                  */
8806                                 ctl_cnt = bundle_at = 0;
8807                                 continue;       /* This takes us back to the
8808                                                  * for() for the nets. */
8809                         } else {
8810                                 asoc->ifp_had_enobuf = 0;
8811                         }
8812                         endoutchain = NULL;
8813                         auth = NULL;
8814                         auth_offset = 0;
8815                         if (!no_out_cnt) {
8816                                 *num_out += (ctl_cnt + bundle_at);
8817                         }
8818                         if (bundle_at) {
8819                                 /* setup for a RTO measurement */
8820                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8821                                 /* fill time if not already filled */
8822                                 if (*now_filled == 0) {
8823                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8824                                         *now_filled = 1;
8825                                         *now = asoc->time_last_sent;
8826                                 } else {
8827                                         asoc->time_last_sent = *now;
8828                                 }
8829                                 if (net->rto_needed) {
8830                                         data_list[0]->do_rtt = 1;
8831                                         net->rto_needed = 0;
8832                                 }
8833                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8834                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8835                         }
8836                         if (one_chunk) {
8837                                 break;
8838                         }
8839                 }
8840                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8841                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8842                 }
8843         }
8844         if (old_start_at == NULL) {
8845                 old_start_at = start_at;
8846                 start_at = TAILQ_FIRST(&asoc->nets);
8847                 if (old_start_at)
8848                         goto again_one_more_time;
8849         }
8850         /*
8851          * At the end there should be no NON timed chunks hanging on this
8852          * queue.
8853          */
8854         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8855                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8856         }
8857         if ((*num_out == 0) && (*reason_code == 0)) {
8858                 *reason_code = 4;
8859         } else {
8860                 *reason_code = 5;
8861         }
8862         sctp_clean_up_ctl(stcb, asoc, so_locked);
8863         return (0);
8864 }
8865
8866 void
8867 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8868 {
8869         /*-
8870          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8871          * the control chunk queue.
8872          */
8873         struct sctp_chunkhdr *hdr;
8874         struct sctp_tmit_chunk *chk;
8875         struct mbuf *mat, *last_mbuf;
8876         uint32_t chunk_length;
8877         uint16_t padding_length;
8878
8879         SCTP_TCB_LOCK_ASSERT(stcb);
8880         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8881         if (op_err == NULL) {
8882                 return;
8883         }
8884         last_mbuf = NULL;
8885         chunk_length = 0;
8886         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8887                 chunk_length += SCTP_BUF_LEN(mat);
8888                 if (SCTP_BUF_NEXT(mat) == NULL) {
8889                         last_mbuf = mat;
8890                 }
8891         }
8892         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8893                 sctp_m_freem(op_err);
8894                 return;
8895         }
8896         padding_length = chunk_length % 4;
8897         if (padding_length != 0) {
8898                 padding_length = 4 - padding_length;
8899         }
8900         if (padding_length != 0) {
8901                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8902                         sctp_m_freem(op_err);
8903                         return;
8904                 }
8905         }
8906         sctp_alloc_a_chunk(stcb, chk);
8907         if (chk == NULL) {
8908                 /* no memory */
8909                 sctp_m_freem(op_err);
8910                 return;
8911         }
8912         chk->copy_by_ref = 0;
8913         chk->send_size = (uint16_t) chunk_length;
8914         chk->sent = SCTP_DATAGRAM_UNSENT;
8915         chk->snd_count = 0;
8916         chk->asoc = &stcb->asoc;
8917         chk->data = op_err;
8918         chk->whoTo = NULL;
8919         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8920         chk->rec.chunk_id.can_take_data = 0;
8921         hdr = mtod(op_err, struct sctp_chunkhdr *);
8922         hdr->chunk_type = SCTP_OPERATION_ERROR;
8923         hdr->chunk_flags = 0;
8924         hdr->chunk_length = htons(chk->send_size);
8925         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8926         chk->asoc->ctrl_queue_cnt++;
8927 }
8928
8929 int
8930 sctp_send_cookie_echo(struct mbuf *m,
8931     int offset,
8932     struct sctp_tcb *stcb,
8933     struct sctp_nets *net)
8934 {
8935         /*-
8936          * pull out the cookie and put it at the front of the control chunk
8937          * queue.
8938          */
8939         int at;
8940         struct mbuf *cookie;
8941         struct sctp_paramhdr parm, *phdr;
8942         struct sctp_chunkhdr *hdr;
8943         struct sctp_tmit_chunk *chk;
8944         uint16_t ptype, plen;
8945
8946         SCTP_TCB_LOCK_ASSERT(stcb);
8947         /* First find the cookie in the param area */
8948         cookie = NULL;
8949         at = offset + sizeof(struct sctp_init_chunk);
8950         for (;;) {
8951                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8952                 if (phdr == NULL) {
8953                         return (-3);
8954                 }
8955                 ptype = ntohs(phdr->param_type);
8956                 plen = ntohs(phdr->param_length);
8957                 if (ptype == SCTP_STATE_COOKIE) {
8958                         int pad;
8959
8960                         /* found the cookie */
8961                         if ((pad = (plen % 4))) {
8962                                 plen += 4 - pad;
8963                         }
8964                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8965                         if (cookie == NULL) {
8966                                 /* No memory */
8967                                 return (-2);
8968                         }
8969 #ifdef SCTP_MBUF_LOGGING
8970                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8971                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8972                         }
8973 #endif
8974                         break;
8975                 }
8976                 at += SCTP_SIZE32(plen);
8977         }
8978         /* ok, we got the cookie lets change it into a cookie echo chunk */
8979         /* first the change from param to cookie */
8980         hdr = mtod(cookie, struct sctp_chunkhdr *);
8981         hdr->chunk_type = SCTP_COOKIE_ECHO;
8982         hdr->chunk_flags = 0;
8983         /* get the chunk stuff now and place it in the FRONT of the queue */
8984         sctp_alloc_a_chunk(stcb, chk);
8985         if (chk == NULL) {
8986                 /* no memory */
8987                 sctp_m_freem(cookie);
8988                 return (-5);
8989         }
8990         chk->copy_by_ref = 0;
8991         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8992         chk->rec.chunk_id.can_take_data = 0;
8993         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8994         chk->send_size = plen;
8995         chk->sent = SCTP_DATAGRAM_UNSENT;
8996         chk->snd_count = 0;
8997         chk->asoc = &stcb->asoc;
8998         chk->data = cookie;
8999         chk->whoTo = net;
9000         atomic_add_int(&chk->whoTo->ref_count, 1);
9001         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9002         chk->asoc->ctrl_queue_cnt++;
9003         return (0);
9004 }
9005
9006 void
9007 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9008     struct mbuf *m,
9009     int offset,
9010     int chk_length,
9011     struct sctp_nets *net)
9012 {
9013         /*
9014          * take a HB request and make it into a HB ack and send it.
9015          */
9016         struct mbuf *outchain;
9017         struct sctp_chunkhdr *chdr;
9018         struct sctp_tmit_chunk *chk;
9019
9020
9021         if (net == NULL)
9022                 /* must have a net pointer */
9023                 return;
9024
9025         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9026         if (outchain == NULL) {
9027                 /* gak out of memory */
9028                 return;
9029         }
9030 #ifdef SCTP_MBUF_LOGGING
9031         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9032                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9033         }
9034 #endif
9035         chdr = mtod(outchain, struct sctp_chunkhdr *);
9036         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9037         chdr->chunk_flags = 0;
9038         if (chk_length % 4) {
9039                 /* need pad */
9040                 uint32_t cpthis = 0;
9041                 int padlen;
9042
9043                 padlen = 4 - (chk_length % 4);
9044                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9045         }
9046         sctp_alloc_a_chunk(stcb, chk);
9047         if (chk == NULL) {
9048                 /* no memory */
9049                 sctp_m_freem(outchain);
9050                 return;
9051         }
9052         chk->copy_by_ref = 0;
9053         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9054         chk->rec.chunk_id.can_take_data = 1;
9055         chk->flags = 0;
9056         chk->send_size = chk_length;
9057         chk->sent = SCTP_DATAGRAM_UNSENT;
9058         chk->snd_count = 0;
9059         chk->asoc = &stcb->asoc;
9060         chk->data = outchain;
9061         chk->whoTo = net;
9062         atomic_add_int(&chk->whoTo->ref_count, 1);
9063         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9064         chk->asoc->ctrl_queue_cnt++;
9065 }
9066
9067 void
9068 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9069 {
9070         /* formulate and queue a cookie-ack back to sender */
9071         struct mbuf *cookie_ack;
9072         struct sctp_chunkhdr *hdr;
9073         struct sctp_tmit_chunk *chk;
9074
9075         SCTP_TCB_LOCK_ASSERT(stcb);
9076
9077         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9078         if (cookie_ack == NULL) {
9079                 /* no mbuf's */
9080                 return;
9081         }
9082         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9083         sctp_alloc_a_chunk(stcb, chk);
9084         if (chk == NULL) {
9085                 /* no memory */
9086                 sctp_m_freem(cookie_ack);
9087                 return;
9088         }
9089         chk->copy_by_ref = 0;
9090         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9091         chk->rec.chunk_id.can_take_data = 1;
9092         chk->flags = 0;
9093         chk->send_size = sizeof(struct sctp_chunkhdr);
9094         chk->sent = SCTP_DATAGRAM_UNSENT;
9095         chk->snd_count = 0;
9096         chk->asoc = &stcb->asoc;
9097         chk->data = cookie_ack;
9098         if (chk->asoc->last_control_chunk_from != NULL) {
9099                 chk->whoTo = chk->asoc->last_control_chunk_from;
9100                 atomic_add_int(&chk->whoTo->ref_count, 1);
9101         } else {
9102                 chk->whoTo = NULL;
9103         }
9104         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9105         hdr->chunk_type = SCTP_COOKIE_ACK;
9106         hdr->chunk_flags = 0;
9107         hdr->chunk_length = htons(chk->send_size);
9108         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9109         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9110         chk->asoc->ctrl_queue_cnt++;
9111         return;
9112 }
9113
9114
9115 void
9116 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9117 {
9118         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9119         struct mbuf *m_shutdown_ack;
9120         struct sctp_shutdown_ack_chunk *ack_cp;
9121         struct sctp_tmit_chunk *chk;
9122
9123         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9124         if (m_shutdown_ack == NULL) {
9125                 /* no mbuf's */
9126                 return;
9127         }
9128         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9129         sctp_alloc_a_chunk(stcb, chk);
9130         if (chk == NULL) {
9131                 /* no memory */
9132                 sctp_m_freem(m_shutdown_ack);
9133                 return;
9134         }
9135         chk->copy_by_ref = 0;
9136         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9137         chk->rec.chunk_id.can_take_data = 1;
9138         chk->flags = 0;
9139         chk->send_size = sizeof(struct sctp_chunkhdr);
9140         chk->sent = SCTP_DATAGRAM_UNSENT;
9141         chk->snd_count = 0;
9142         chk->flags = 0;
9143         chk->asoc = &stcb->asoc;
9144         chk->data = m_shutdown_ack;
9145         chk->whoTo = net;
9146         if (chk->whoTo) {
9147                 atomic_add_int(&chk->whoTo->ref_count, 1);
9148         }
9149         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9150         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9151         ack_cp->ch.chunk_flags = 0;
9152         ack_cp->ch.chunk_length = htons(chk->send_size);
9153         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9154         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9155         chk->asoc->ctrl_queue_cnt++;
9156         return;
9157 }
9158
9159 void
9160 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9161 {
9162         /* formulate and queue a SHUTDOWN to the sender */
9163         struct mbuf *m_shutdown;
9164         struct sctp_shutdown_chunk *shutdown_cp;
9165         struct sctp_tmit_chunk *chk;
9166
9167         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9168         if (m_shutdown == NULL) {
9169                 /* no mbuf's */
9170                 return;
9171         }
9172         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9173         sctp_alloc_a_chunk(stcb, chk);
9174         if (chk == NULL) {
9175                 /* no memory */
9176                 sctp_m_freem(m_shutdown);
9177                 return;
9178         }
9179         chk->copy_by_ref = 0;
9180         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9181         chk->rec.chunk_id.can_take_data = 1;
9182         chk->flags = 0;
9183         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9184         chk->sent = SCTP_DATAGRAM_UNSENT;
9185         chk->snd_count = 0;
9186         chk->flags = 0;
9187         chk->asoc = &stcb->asoc;
9188         chk->data = m_shutdown;
9189         chk->whoTo = net;
9190         if (chk->whoTo) {
9191                 atomic_add_int(&chk->whoTo->ref_count, 1);
9192         }
9193         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9194         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9195         shutdown_cp->ch.chunk_flags = 0;
9196         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9197         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9198         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9199         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9200         chk->asoc->ctrl_queue_cnt++;
9201         return;
9202 }
9203
9204 void
9205 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9206 {
9207         /*
9208          * formulate and queue an ASCONF to the peer. ASCONF parameters
9209          * should be queued on the assoc queue.
9210          */
9211         struct sctp_tmit_chunk *chk;
9212         struct mbuf *m_asconf;
9213         int len;
9214
9215         SCTP_TCB_LOCK_ASSERT(stcb);
9216
9217         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9218             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9219                 /* can't send a new one if there is one in flight already */
9220                 return;
9221         }
9222         /* compose an ASCONF chunk, maximum length is PMTU */
9223         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9224         if (m_asconf == NULL) {
9225                 return;
9226         }
9227         sctp_alloc_a_chunk(stcb, chk);
9228         if (chk == NULL) {
9229                 /* no memory */
9230                 sctp_m_freem(m_asconf);
9231                 return;
9232         }
9233         chk->copy_by_ref = 0;
9234         chk->rec.chunk_id.id = SCTP_ASCONF;
9235         chk->rec.chunk_id.can_take_data = 0;
9236         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9237         chk->data = m_asconf;
9238         chk->send_size = len;
9239         chk->sent = SCTP_DATAGRAM_UNSENT;
9240         chk->snd_count = 0;
9241         chk->asoc = &stcb->asoc;
9242         chk->whoTo = net;
9243         if (chk->whoTo) {
9244                 atomic_add_int(&chk->whoTo->ref_count, 1);
9245         }
9246         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9247         chk->asoc->ctrl_queue_cnt++;
9248         return;
9249 }
9250
9251 void
9252 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9253 {
9254         /*
9255          * formulate and queue a asconf-ack back to sender. the asconf-ack
9256          * must be stored in the tcb.
9257          */
9258         struct sctp_tmit_chunk *chk;
9259         struct sctp_asconf_ack *ack, *latest_ack;
9260         struct mbuf *m_ack;
9261         struct sctp_nets *net = NULL;
9262
9263         SCTP_TCB_LOCK_ASSERT(stcb);
9264         /* Get the latest ASCONF-ACK */
9265         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9266         if (latest_ack == NULL) {
9267                 return;
9268         }
9269         if (latest_ack->last_sent_to != NULL &&
9270             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9271                 /* we're doing a retransmission */
9272                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9273                 if (net == NULL) {
9274                         /* no alternate */
9275                         if (stcb->asoc.last_control_chunk_from == NULL) {
9276                                 if (stcb->asoc.alternate) {
9277                                         net = stcb->asoc.alternate;
9278                                 } else {
9279                                         net = stcb->asoc.primary_destination;
9280                                 }
9281                         } else {
9282                                 net = stcb->asoc.last_control_chunk_from;
9283                         }
9284                 }
9285         } else {
9286                 /* normal case */
9287                 if (stcb->asoc.last_control_chunk_from == NULL) {
9288                         if (stcb->asoc.alternate) {
9289                                 net = stcb->asoc.alternate;
9290                         } else {
9291                                 net = stcb->asoc.primary_destination;
9292                         }
9293                 } else {
9294                         net = stcb->asoc.last_control_chunk_from;
9295                 }
9296         }
9297         latest_ack->last_sent_to = net;
9298
9299         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9300                 if (ack->data == NULL) {
9301                         continue;
9302                 }
9303                 /* copy the asconf_ack */
9304                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9305                 if (m_ack == NULL) {
9306                         /* couldn't copy it */
9307                         return;
9308                 }
9309 #ifdef SCTP_MBUF_LOGGING
9310                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9311                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9312                 }
9313 #endif
9314
9315                 sctp_alloc_a_chunk(stcb, chk);
9316                 if (chk == NULL) {
9317                         /* no memory */
9318                         if (m_ack)
9319                                 sctp_m_freem(m_ack);
9320                         return;
9321                 }
9322                 chk->copy_by_ref = 0;
9323                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9324                 chk->rec.chunk_id.can_take_data = 1;
9325                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9326                 chk->whoTo = net;
9327                 if (chk->whoTo) {
9328                         atomic_add_int(&chk->whoTo->ref_count, 1);
9329                 }
9330                 chk->data = m_ack;
9331                 chk->send_size = ack->len;
9332                 chk->sent = SCTP_DATAGRAM_UNSENT;
9333                 chk->snd_count = 0;
9334                 chk->asoc = &stcb->asoc;
9335
9336                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9337                 chk->asoc->ctrl_queue_cnt++;
9338         }
9339         return;
9340 }
9341
9342
9343 static int
9344 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9345     struct sctp_tcb *stcb,
9346     struct sctp_association *asoc,
9347     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9348 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9349     SCTP_UNUSED
9350 #endif
9351 )
9352 {
9353         /*-
9354          * send out one MTU of retransmission. If fast_retransmit is
9355          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9356          * rwnd. For a Cookie or Asconf in the control chunk queue we
9357          * retransmit them by themselves.
9358          *
9359          * For data chunks we will pick out the lowest TSN's in the sent_queue
9360          * marked for resend and bundle them all together (up to a MTU of
9361          * destination). The address to send to should have been
9362          * selected/changed where the retransmission was marked (i.e. in FR
9363          * or t3-timeout routines).
9364          */
9365         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9366         struct sctp_tmit_chunk *chk, *fwd;
9367         struct mbuf *m, *endofchain;
9368         struct sctp_nets *net = NULL;
9369         uint32_t tsns_sent = 0;
9370         int no_fragmentflg, bundle_at, cnt_thru;
9371         unsigned int mtu;
9372         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9373         struct sctp_auth_chunk *auth = NULL;
9374         uint32_t auth_offset = 0;
9375         uint16_t auth_keyid;
9376         int override_ok = 1;
9377         int data_auth_reqd = 0;
9378         uint32_t dmtu = 0;
9379
9380         SCTP_TCB_LOCK_ASSERT(stcb);
9381         tmr_started = ctl_cnt = bundle_at = error = 0;
9382         no_fragmentflg = 1;
9383         fwd_tsn = 0;
9384         *cnt_out = 0;
9385         fwd = NULL;
9386         endofchain = m = NULL;
9387         auth_keyid = stcb->asoc.authinfo.active_keyid;
9388 #ifdef SCTP_AUDITING_ENABLED
9389         sctp_audit_log(0xC3, 1);
9390 #endif
9391         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9392             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9393                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9394                     asoc->sent_queue_retran_cnt);
9395                 asoc->sent_queue_cnt = 0;
9396                 asoc->sent_queue_cnt_removeable = 0;
9397                 /* send back 0/0 so we enter normal transmission */
9398                 *cnt_out = 0;
9399                 return (0);
9400         }
9401         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9402                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9403                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9404                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9405                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9406                                 continue;
9407                         }
9408                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9409                                 if (chk != asoc->str_reset) {
9410                                         /*
9411                                          * not eligible for retran if its
9412                                          * not ours
9413                                          */
9414                                         continue;
9415                                 }
9416                         }
9417                         ctl_cnt++;
9418                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9419                                 fwd_tsn = 1;
9420                         }
9421                         /*
9422                          * Add an AUTH chunk, if chunk requires it save the
9423                          * offset into the chain for AUTH
9424                          */
9425                         if ((auth == NULL) &&
9426                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9427                             stcb->asoc.peer_auth_chunks))) {
9428                                 m = sctp_add_auth_chunk(m, &endofchain,
9429                                     &auth, &auth_offset,
9430                                     stcb,
9431                                     chk->rec.chunk_id.id);
9432                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9433                         }
9434                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9435                         break;
9436                 }
9437         }
9438         one_chunk = 0;
9439         cnt_thru = 0;
9440         /* do we have control chunks to retransmit? */
9441         if (m != NULL) {
9442                 /* Start a timer no matter if we succeed or fail */
9443                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9444                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9445                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9446                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9447                 chk->snd_count++;       /* update our count */
9448                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9449                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9450                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9451                     no_fragmentflg, 0, 0,
9452                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9453                     chk->whoTo->port, NULL,
9454                     0, 0,
9455                     so_locked))) {
9456                         SCTP_STAT_INCR(sctps_lowlevelerr);
9457                         return (error);
9458                 }
9459                 endofchain = NULL;
9460                 auth = NULL;
9461                 auth_offset = 0;
9462                 /*
9463                  * We don't want to mark the net->sent time here since this
9464                  * we use this for HB and retrans cannot measure RTT
9465                  */
9466                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9467                 *cnt_out += 1;
9468                 chk->sent = SCTP_DATAGRAM_SENT;
9469                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9470                 if (fwd_tsn == 0) {
9471                         return (0);
9472                 } else {
9473                         /* Clean up the fwd-tsn list */
9474                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9475                         return (0);
9476                 }
9477         }
9478         /*
9479          * Ok, it is just data retransmission we need to do or that and a
9480          * fwd-tsn with it all.
9481          */
9482         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9483                 return (SCTP_RETRAN_DONE);
9484         }
9485         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9486             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9487                 /* not yet open, resend the cookie and that is it */
9488                 return (1);
9489         }
9490 #ifdef SCTP_AUDITING_ENABLED
9491         sctp_auditing(20, inp, stcb, NULL);
9492 #endif
9493         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9494         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9495                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9496                         /* No, not sent to this net or not ready for rtx */
9497                         continue;
9498                 }
9499                 if (chk->data == NULL) {
9500                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9501                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9502                         continue;
9503                 }
9504                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9505                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9506                         struct mbuf *op_err;
9507                         char msg[SCTP_DIAG_INFO_LEN];
9508
9509                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9510                             chk->rec.data.TSN_seq, chk->snd_count);
9511                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9512                             msg);
9513                         atomic_add_int(&stcb->asoc.refcnt, 1);
9514                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9515                             so_locked);
9516                         SCTP_TCB_LOCK(stcb);
9517                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9518                         return (SCTP_RETRAN_EXIT);
9519                 }
9520                 /* pick up the net */
9521                 net = chk->whoTo;
9522                 switch (net->ro._l_addr.sa.sa_family) {
9523 #ifdef INET
9524                 case AF_INET:
9525                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9526                         break;
9527 #endif
9528 #ifdef INET6
9529                 case AF_INET6:
9530                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9531                         break;
9532 #endif
9533                 default:
9534                         /* TSNH */
9535                         mtu = net->mtu;
9536                         break;
9537                 }
9538
9539                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9540                         /* No room in peers rwnd */
9541                         uint32_t tsn;
9542
9543                         tsn = asoc->last_acked_seq + 1;
9544                         if (tsn == chk->rec.data.TSN_seq) {
9545                                 /*
9546                                  * we make a special exception for this
9547                                  * case. The peer has no rwnd but is missing
9548                                  * the lowest chunk.. which is probably what
9549                                  * is holding up the rwnd.
9550                                  */
9551                                 goto one_chunk_around;
9552                         }
9553                         return (1);
9554                 }
9555 one_chunk_around:
9556                 if (asoc->peers_rwnd < mtu) {
9557                         one_chunk = 1;
9558                         if ((asoc->peers_rwnd == 0) &&
9559                             (asoc->total_flight == 0)) {
9560                                 chk->window_probe = 1;
9561                                 chk->whoTo->window_probe = 1;
9562                         }
9563                 }
9564 #ifdef SCTP_AUDITING_ENABLED
9565                 sctp_audit_log(0xC3, 2);
9566 #endif
9567                 bundle_at = 0;
9568                 m = NULL;
9569                 net->fast_retran_ip = 0;
9570                 if (chk->rec.data.doing_fast_retransmit == 0) {
9571                         /*
9572                          * if no FR in progress skip destination that have
9573                          * flight_size > cwnd.
9574                          */
9575                         if (net->flight_size >= net->cwnd) {
9576                                 continue;
9577                         }
9578                 } else {
9579                         /*
9580                          * Mark the destination net to have FR recovery
9581                          * limits put on it.
9582                          */
9583                         *fr_done = 1;
9584                         net->fast_retran_ip = 1;
9585                 }
9586
9587                 /*
9588                  * if no AUTH is yet included and this chunk requires it,
9589                  * make sure to account for it.  We don't apply the size
9590                  * until the AUTH chunk is actually added below in case
9591                  * there is no room for this chunk.
9592                  */
9593                 if (data_auth_reqd && (auth == NULL)) {
9594                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9595                 } else
9596                         dmtu = 0;
9597
9598                 if ((chk->send_size <= (mtu - dmtu)) ||
9599                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9600                         /* ok we will add this one */
9601                         if (data_auth_reqd) {
9602                                 if (auth == NULL) {
9603                                         m = sctp_add_auth_chunk(m,
9604                                             &endofchain,
9605                                             &auth,
9606                                             &auth_offset,
9607                                             stcb,
9608                                             SCTP_DATA);
9609                                         auth_keyid = chk->auth_keyid;
9610                                         override_ok = 0;
9611                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9612                                 } else if (override_ok) {
9613                                         auth_keyid = chk->auth_keyid;
9614                                         override_ok = 0;
9615                                 } else if (chk->auth_keyid != auth_keyid) {
9616                                         /* different keyid, so done bundling */
9617                                         break;
9618                                 }
9619                         }
9620                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9621                         if (m == NULL) {
9622                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9623                                 return (ENOMEM);
9624                         }
9625                         /* Do clear IP_DF ? */
9626                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9627                                 no_fragmentflg = 0;
9628                         }
9629                         /* upate our MTU size */
9630                         if (mtu > (chk->send_size + dmtu))
9631                                 mtu -= (chk->send_size + dmtu);
9632                         else
9633                                 mtu = 0;
9634                         data_list[bundle_at++] = chk;
9635                         if (one_chunk && (asoc->total_flight <= 0)) {
9636                                 SCTP_STAT_INCR(sctps_windowprobed);
9637                         }
9638                 }
9639                 if (one_chunk == 0) {
9640                         /*
9641                          * now are there anymore forward from chk to pick
9642                          * up?
9643                          */
9644                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9645                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9646                                         /* Nope, not for retran */
9647                                         continue;
9648                                 }
9649                                 if (fwd->whoTo != net) {
9650                                         /* Nope, not the net in question */
9651                                         continue;
9652                                 }
9653                                 if (data_auth_reqd && (auth == NULL)) {
9654                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9655                                 } else
9656                                         dmtu = 0;
9657                                 if (fwd->send_size <= (mtu - dmtu)) {
9658                                         if (data_auth_reqd) {
9659                                                 if (auth == NULL) {
9660                                                         m = sctp_add_auth_chunk(m,
9661                                                             &endofchain,
9662                                                             &auth,
9663                                                             &auth_offset,
9664                                                             stcb,
9665                                                             SCTP_DATA);
9666                                                         auth_keyid = fwd->auth_keyid;
9667                                                         override_ok = 0;
9668                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9669                                                 } else if (override_ok) {
9670                                                         auth_keyid = fwd->auth_keyid;
9671                                                         override_ok = 0;
9672                                                 } else if (fwd->auth_keyid != auth_keyid) {
9673                                                         /* different keyid,
9674                                                          * so done bundling */
9675                                                         break;
9676                                                 }
9677                                         }
9678                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9679                                         if (m == NULL) {
9680                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9681                                                 return (ENOMEM);
9682                                         }
9683                                         /* Do clear IP_DF ? */
9684                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9685                                                 no_fragmentflg = 0;
9686                                         }
9687                                         /* upate our MTU size */
9688                                         if (mtu > (fwd->send_size + dmtu))
9689                                                 mtu -= (fwd->send_size + dmtu);
9690                                         else
9691                                                 mtu = 0;
9692                                         data_list[bundle_at++] = fwd;
9693                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9694                                                 break;
9695                                         }
9696                                 } else {
9697                                         /* can't fit so we are done */
9698                                         break;
9699                                 }
9700                         }
9701                 }
9702                 /* Is there something to send for this destination? */
9703                 if (m) {
9704                         /*
9705                          * No matter if we fail/or succeed we should start a
9706                          * timer. A failure is like a lost IP packet :-)
9707                          */
9708                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9709                                 /*
9710                                  * no timer running on this destination
9711                                  * restart it.
9712                                  */
9713                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9714                                 tmr_started = 1;
9715                         }
9716                         /* Now lets send it, if there is anything to send :> */
9717                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9718                             (struct sockaddr *)&net->ro._l_addr, m,
9719                             auth_offset, auth, auth_keyid,
9720                             no_fragmentflg, 0, 0,
9721                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9722                             net->port, NULL,
9723                             0, 0,
9724                             so_locked))) {
9725                                 /* error, we could not output */
9726                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9727                                 return (error);
9728                         }
9729                         endofchain = NULL;
9730                         auth = NULL;
9731                         auth_offset = 0;
9732                         /* For HB's */
9733                         /*
9734                          * We don't want to mark the net->sent time here
9735                          * since this we use this for HB and retrans cannot
9736                          * measure RTT
9737                          */
9738                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9739
9740                         /* For auto-close */
9741                         cnt_thru++;
9742                         if (*now_filled == 0) {
9743                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9744                                 *now = asoc->time_last_sent;
9745                                 *now_filled = 1;
9746                         } else {
9747                                 asoc->time_last_sent = *now;
9748                         }
9749                         *cnt_out += bundle_at;
9750 #ifdef SCTP_AUDITING_ENABLED
9751                         sctp_audit_log(0xC4, bundle_at);
9752 #endif
9753                         if (bundle_at) {
9754                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9755                         }
9756                         for (i = 0; i < bundle_at; i++) {
9757                                 SCTP_STAT_INCR(sctps_sendretransdata);
9758                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9759                                 /*
9760                                  * When we have a revoked data, and we
9761                                  * retransmit it, then we clear the revoked
9762                                  * flag since this flag dictates if we
9763                                  * subtracted from the fs
9764                                  */
9765                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9766                                         /* Deflate the cwnd */
9767                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9768                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9769                                 }
9770                                 data_list[i]->snd_count++;
9771                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9772                                 /* record the time */
9773                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9774                                 if (data_list[i]->book_size_scale) {
9775                                         /*
9776                                          * need to double the book size on
9777                                          * this one
9778                                          */
9779                                         data_list[i]->book_size_scale = 0;
9780                                         /*
9781                                          * Since we double the booksize, we
9782                                          * must also double the output queue
9783                                          * size, since this get shrunk when
9784                                          * we free by this amount.
9785                                          */
9786                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9787                                         data_list[i]->book_size *= 2;
9788
9789
9790                                 } else {
9791                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9792                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9793                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9794                                         }
9795                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9796                                             (uint32_t) (data_list[i]->send_size +
9797                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9798                                 }
9799                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9800                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9801                                             data_list[i]->whoTo->flight_size,
9802                                             data_list[i]->book_size,
9803                                             (uint32_t) (uintptr_t) data_list[i]->whoTo,
9804                                             data_list[i]->rec.data.TSN_seq);
9805                                 }
9806                                 sctp_flight_size_increase(data_list[i]);
9807                                 sctp_total_flight_increase(stcb, data_list[i]);
9808                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9809                                         /* SWS sender side engages */
9810                                         asoc->peers_rwnd = 0;
9811                                 }
9812                                 if ((i == 0) &&
9813                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9814                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9815                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9816                                             (tmr_started == 0)) {
9817                                                 /*-
9818                                                  * ok we just fast-retrans'd
9819                                                  * the lowest TSN, i.e the
9820                                                  * first on the list. In
9821                                                  * this case we want to give
9822                                                  * some more time to get a
9823                                                  * SACK back without a
9824                                                  * t3-expiring.
9825                                                  */
9826                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9827                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9828                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9829                                         }
9830                                 }
9831                         }
9832                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9833                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9834                         }
9835 #ifdef SCTP_AUDITING_ENABLED
9836                         sctp_auditing(21, inp, stcb, NULL);
9837 #endif
9838                 } else {
9839                         /* None will fit */
9840                         return (1);
9841                 }
9842                 if (asoc->sent_queue_retran_cnt <= 0) {
9843                         /* all done we have no more to retran */
9844                         asoc->sent_queue_retran_cnt = 0;
9845                         break;
9846                 }
9847                 if (one_chunk) {
9848                         /* No more room in rwnd */
9849                         return (1);
9850                 }
9851                 /* stop the for loop here. we sent out a packet */
9852                 break;
9853         }
9854         return (0);
9855 }
9856
9857 static void
9858 sctp_timer_validation(struct sctp_inpcb *inp,
9859     struct sctp_tcb *stcb,
9860     struct sctp_association *asoc)
9861 {
9862         struct sctp_nets *net;
9863
9864         /* Validate that a timer is running somewhere */
9865         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9866                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9867                         /* Here is a timer */
9868                         return;
9869                 }
9870         }
9871         SCTP_TCB_LOCK_ASSERT(stcb);
9872         /* Gak, we did not have a timer somewhere */
9873         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9874         if (asoc->alternate) {
9875                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9876         } else {
9877                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9878         }
9879         return;
9880 }
9881
9882 void
9883 sctp_chunk_output(struct sctp_inpcb *inp,
9884     struct sctp_tcb *stcb,
9885     int from_where,
9886     int so_locked
9887 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9888     SCTP_UNUSED
9889 #endif
9890 )
9891 {
9892         /*-
9893          * Ok this is the generic chunk service queue. we must do the
9894          * following:
9895          * - See if there are retransmits pending, if so we must
9896          *   do these first.
9897          * - Service the stream queue that is next, moving any
9898          *   message (note I must get a complete message i.e.
9899          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9900          *   TSN's
9901          * - Check to see if the cwnd/rwnd allows any output, if so we
9902          *   go ahead and fomulate and send the low level chunks. Making sure
9903          *   to combine any control in the control chunk queue also.
9904          */
9905         struct sctp_association *asoc;
9906         struct sctp_nets *net;
9907         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9908         unsigned int burst_cnt = 0;
9909         struct timeval now;
9910         int now_filled = 0;
9911         int nagle_on;
9912         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9913         int un_sent = 0;
9914         int fr_done;
9915         unsigned int tot_frs = 0;
9916
9917         asoc = &stcb->asoc;
9918 do_it_again:
9919         /* The Nagle algorithm is only applied when handling a send call. */
9920         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9921                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9922                         nagle_on = 0;
9923                 } else {
9924                         nagle_on = 1;
9925                 }
9926         } else {
9927                 nagle_on = 0;
9928         }
9929         SCTP_TCB_LOCK_ASSERT(stcb);
9930
9931         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9932
9933         if ((un_sent <= 0) &&
9934             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9935             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9936             (asoc->sent_queue_retran_cnt == 0) &&
9937             (asoc->trigger_reset == 0)) {
9938                 /* Nothing to do unless there is something to be sent left */
9939                 return;
9940         }
9941         /*
9942          * Do we have something to send, data or control AND a sack timer
9943          * running, if so piggy-back the sack.
9944          */
9945         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9946                 sctp_send_sack(stcb, so_locked);
9947                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9948         }
9949         while (asoc->sent_queue_retran_cnt) {
9950                 /*-
9951                  * Ok, it is retransmission time only, we send out only ONE
9952                  * packet with a single call off to the retran code.
9953                  */
9954                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9955                         /*-
9956                          * Special hook for handling cookiess discarded
9957                          * by peer that carried data. Send cookie-ack only
9958                          * and then the next call with get the retran's.
9959                          */
9960                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9961                             from_where,
9962                             &now, &now_filled, frag_point, so_locked);
9963                         return;
9964                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9965                         /* if its not from a HB then do it */
9966                         fr_done = 0;
9967                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9968                         if (fr_done) {
9969                                 tot_frs++;
9970                         }
9971                 } else {
9972                         /*
9973                          * its from any other place, we don't allow retran
9974                          * output (only control)
9975                          */
9976                         ret = 1;
9977                 }
9978                 if (ret > 0) {
9979                         /* Can't send anymore */
9980                         /*-
9981                          * now lets push out control by calling med-level
9982                          * output once. this assures that we WILL send HB's
9983                          * if queued too.
9984                          */
9985                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9986                             from_where,
9987                             &now, &now_filled, frag_point, so_locked);
9988 #ifdef SCTP_AUDITING_ENABLED
9989                         sctp_auditing(8, inp, stcb, NULL);
9990 #endif
9991                         sctp_timer_validation(inp, stcb, asoc);
9992                         return;
9993                 }
9994                 if (ret < 0) {
9995                         /*-
9996                          * The count was off.. retran is not happening so do
9997                          * the normal retransmission.
9998                          */
9999 #ifdef SCTP_AUDITING_ENABLED
10000                         sctp_auditing(9, inp, stcb, NULL);
10001 #endif
10002                         if (ret == SCTP_RETRAN_EXIT) {
10003                                 return;
10004                         }
10005                         break;
10006                 }
10007                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10008                         /* Only one transmission allowed out of a timeout */
10009 #ifdef SCTP_AUDITING_ENABLED
10010                         sctp_auditing(10, inp, stcb, NULL);
10011 #endif
10012                         /* Push out any control */
10013                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10014                             &now, &now_filled, frag_point, so_locked);
10015                         return;
10016                 }
10017                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10018                         /* Hit FR burst limit */
10019                         return;
10020                 }
10021                 if ((num_out == 0) && (ret == 0)) {
10022                         /* No more retrans to send */
10023                         break;
10024                 }
10025         }
10026 #ifdef SCTP_AUDITING_ENABLED
10027         sctp_auditing(12, inp, stcb, NULL);
10028 #endif
10029         /* Check for bad destinations, if they exist move chunks around. */
10030         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10031                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10032                         /*-
10033                          * if possible move things off of this address we
10034                          * still may send below due to the dormant state but
10035                          * we try to find an alternate address to send to
10036                          * and if we have one we move all queued data on the
10037                          * out wheel to this alternate address.
10038                          */
10039                         if (net->ref_count > 1)
10040                                 sctp_move_chunks_from_net(stcb, net);
10041                 } else {
10042                         /*-
10043                          * if ((asoc->sat_network) || (net->addr_is_local))
10044                          * { burst_limit = asoc->max_burst *
10045                          * SCTP_SAT_NETWORK_BURST_INCR; }
10046                          */
10047                         if (asoc->max_burst > 0) {
10048                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10049                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10050                                                 /* JRS - Use the congestion
10051                                                  * control given in the
10052                                                  * congestion control module */
10053                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10054                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10055                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10056                                                 }
10057                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10058                                         }
10059                                         net->fast_retran_ip = 0;
10060                                 } else {
10061                                         if (net->flight_size == 0) {
10062                                                 /* Should be decaying the
10063                                                  * cwnd here */
10064                                                 ;
10065                                         }
10066                                 }
10067                         }
10068                 }
10069
10070         }
10071         burst_cnt = 0;
10072         do {
10073                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10074                     &reason_code, 0, from_where,
10075                     &now, &now_filled, frag_point, so_locked);
10076                 if (error) {
10077                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10078                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10079                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10080                         }
10081                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10082                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10083                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10084                         }
10085                         break;
10086                 }
10087                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10088
10089                 tot_out += num_out;
10090                 burst_cnt++;
10091                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10092                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10093                         if (num_out == 0) {
10094                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10095                         }
10096                 }
10097                 if (nagle_on) {
10098                         /*
10099                          * When the Nagle algorithm is used, look at how
10100                          * much is unsent, then if its smaller than an MTU
10101                          * and we have data in flight we stop, except if we
10102                          * are handling a fragmented user message.
10103                          */
10104                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10105                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10106                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10107                             (stcb->asoc.total_flight > 0)) {
10108 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10109                                 break;
10110                         }
10111                 }
10112                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10113                     TAILQ_EMPTY(&asoc->send_queue) &&
10114                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10115                         /* Nothing left to send */
10116                         break;
10117                 }
10118                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10119                         /* Nothing left to send */
10120                         break;
10121                 }
10122         } while (num_out &&
10123             ((asoc->max_burst == 0) ||
10124             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10125             (burst_cnt < asoc->max_burst)));
10126
10127         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10128                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10129                         SCTP_STAT_INCR(sctps_maxburstqueued);
10130                         asoc->burst_limit_applied = 1;
10131                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10132                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10133                         }
10134                 } else {
10135                         asoc->burst_limit_applied = 0;
10136                 }
10137         }
10138         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10139                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10140         }
10141         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10142             tot_out);
10143
10144         /*-
10145          * Now we need to clean up the control chunk chain if a ECNE is on
10146          * it. It must be marked as UNSENT again so next call will continue
10147          * to send it until such time that we get a CWR, to remove it.
10148          */
10149         if (stcb->asoc.ecn_echo_cnt_onq)
10150                 sctp_fix_ecn_echo(asoc);
10151
10152         if (stcb->asoc.trigger_reset) {
10153                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10154                         goto do_it_again;
10155                 }
10156         }
10157         return;
10158 }
10159
10160
10161 int
10162 sctp_output(
10163     struct sctp_inpcb *inp,
10164     struct mbuf *m,
10165     struct sockaddr *addr,
10166     struct mbuf *control,
10167     struct thread *p,
10168     int flags)
10169 {
10170         if (inp == NULL) {
10171                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10172                 return (EINVAL);
10173         }
10174         if (inp->sctp_socket == NULL) {
10175                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10176                 return (EINVAL);
10177         }
10178         return (sctp_sosend(inp->sctp_socket,
10179             addr,
10180             (struct uio *)NULL,
10181             m,
10182             control,
10183             flags, p
10184             ));
10185 }
10186
10187 void
10188 send_forward_tsn(struct sctp_tcb *stcb,
10189     struct sctp_association *asoc)
10190 {
10191         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10192         struct sctp_forward_tsn_chunk *fwdtsn;
10193         struct sctp_strseq *strseq;
10194         struct sctp_strseq_mid *strseq_m;
10195         uint32_t advance_peer_ack_point;
10196         unsigned int cnt_of_space, i, ovh;
10197         unsigned int space_needed;
10198         unsigned int cnt_of_skipped = 0;
10199         int old;
10200
10201         if (asoc->idata_supported) {
10202                 old = 0;
10203         } else {
10204                 old = 1;
10205         }
10206         SCTP_TCB_LOCK_ASSERT(stcb);
10207         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10208                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10209                         /* mark it to unsent */
10210                         chk->sent = SCTP_DATAGRAM_UNSENT;
10211                         chk->snd_count = 0;
10212                         /* Do we correct its output location? */
10213                         if (chk->whoTo) {
10214                                 sctp_free_remote_addr(chk->whoTo);
10215                                 chk->whoTo = NULL;
10216                         }
10217                         goto sctp_fill_in_rest;
10218                 }
10219         }
10220         /* Ok if we reach here we must build one */
10221         sctp_alloc_a_chunk(stcb, chk);
10222         if (chk == NULL) {
10223                 return;
10224         }
10225         asoc->fwd_tsn_cnt++;
10226         chk->copy_by_ref = 0;
10227         /*
10228          * We don't do the old thing here since this is used not for on-wire
10229          * but to tell if we are sending a fwd-tsn by the stack during
10230          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10231          */
10232         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10233         chk->rec.chunk_id.can_take_data = 0;
10234         chk->flags = 0;
10235         chk->asoc = asoc;
10236         chk->whoTo = NULL;
10237         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10238         if (chk->data == NULL) {
10239                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10240                 return;
10241         }
10242         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10243         chk->sent = SCTP_DATAGRAM_UNSENT;
10244         chk->snd_count = 0;
10245         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10246         asoc->ctrl_queue_cnt++;
10247 sctp_fill_in_rest:
10248         /*-
10249          * Here we go through and fill out the part that deals with
10250          * stream/seq of the ones we skip.
10251          */
10252         SCTP_BUF_LEN(chk->data) = 0;
10253         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10254                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10255                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10256                         /* no more to look at */
10257                         break;
10258                 }
10259                 if (old && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10260                         /* We don't report these */
10261                         continue;
10262                 }
10263                 cnt_of_skipped++;
10264         }
10265         if (old) {
10266                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10267                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10268         } else {
10269                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10270                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10271         }
10272         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10273
10274         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10275                 ovh = SCTP_MIN_OVERHEAD;
10276         } else {
10277                 ovh = SCTP_MIN_V4_OVERHEAD;
10278         }
10279         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10280                 /* trim to a mtu size */
10281                 cnt_of_space = asoc->smallest_mtu - ovh;
10282         }
10283         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10284                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10285                     0xff, 0, cnt_of_skipped,
10286                     asoc->advanced_peer_ack_point);
10287         }
10288         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10289         if (cnt_of_space < space_needed) {
10290                 /*-
10291                  * ok we must trim down the chunk by lowering the
10292                  * advance peer ack point.
10293                  */
10294                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10295                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10296                             0xff, 0xff, cnt_of_space,
10297                             space_needed);
10298                 }
10299                 if (old) {
10300                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10301                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10302                 } else {
10303                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10304                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10305                 }
10306                 /*-
10307                  * Go through and find the TSN that will be the one
10308                  * we report.
10309                  */
10310                 at = TAILQ_FIRST(&asoc->sent_queue);
10311                 if (at != NULL) {
10312                         for (i = 0; i < cnt_of_skipped; i++) {
10313                                 tp1 = TAILQ_NEXT(at, sctp_next);
10314                                 if (tp1 == NULL) {
10315                                         break;
10316                                 }
10317                                 at = tp1;
10318                         }
10319                 }
10320                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10321                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10322                             0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10323                             asoc->advanced_peer_ack_point);
10324                 }
10325                 last = at;
10326                 /*-
10327                  * last now points to last one I can report, update
10328                  * peer ack point
10329                  */
10330                 if (last) {
10331                         advance_peer_ack_point = last->rec.data.TSN_seq;
10332                 }
10333                 if (old) {
10334                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10335                             cnt_of_skipped * sizeof(struct sctp_strseq);
10336                 } else {
10337                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10338                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10339                 }
10340         }
10341         chk->send_size = space_needed;
10342         /* Setup the chunk */
10343         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10344         fwdtsn->ch.chunk_length = htons(chk->send_size);
10345         fwdtsn->ch.chunk_flags = 0;
10346         if (old) {
10347                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10348         } else {
10349                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10350         }
10351         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10352         SCTP_BUF_LEN(chk->data) = chk->send_size;
10353         fwdtsn++;
10354         /*-
10355          * Move pointer to after the fwdtsn and transfer to the
10356          * strseq pointer.
10357          */
10358         if (old) {
10359                 strseq = (struct sctp_strseq *)fwdtsn;
10360         } else {
10361                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10362         }
10363         /*-
10364          * Now populate the strseq list. This is done blindly
10365          * without pulling out duplicate stream info. This is
10366          * inefficent but won't harm the process since the peer will
10367          * look at these in sequence and will thus release anything.
10368          * It could mean we exceed the PMTU and chop off some that
10369          * we could have included.. but this is unlikely (aka 1432/4
10370          * would mean 300+ stream seq's would have to be reported in
10371          * one FWD-TSN. With a bit of work we can later FIX this to
10372          * optimize and pull out duplicates.. but it does add more
10373          * overhead. So for now... not!
10374          */
10375         i = 0;
10376         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10377                 if (i >= cnt_of_skipped) {
10378                         break;
10379                 }
10380                 if (old && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10381                         /* We don't report these */
10382                         continue;
10383                 }
10384                 if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10385                         at->rec.data.fwd_tsn_cnt = 0;
10386                 }
10387                 if (old) {
10388                         strseq->stream = htons(at->rec.data.stream_number);
10389                         strseq->sequence = htons((uint16_t) at->rec.data.stream_seq);
10390                         strseq++;
10391                 } else {
10392                         strseq_m->stream = htons(at->rec.data.stream_number);
10393                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10394                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10395                         } else {
10396                                 strseq_m->flags = 0;
10397                         }
10398                         strseq_m->msg_id = htonl(at->rec.data.stream_seq);
10399                         strseq_m++;
10400                 }
10401                 i++;
10402         }
10403         return;
10404 }
10405
10406 void
10407 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10408 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10409     SCTP_UNUSED
10410 #endif
10411 )
10412 {
10413         /*-
10414          * Queue up a SACK or NR-SACK in the control queue.
10415          * We must first check to see if a SACK or NR-SACK is
10416          * somehow on the control queue.
10417          * If so, we will take and and remove the old one.
10418          */
10419         struct sctp_association *asoc;
10420         struct sctp_tmit_chunk *chk, *a_chk;
10421         struct sctp_sack_chunk *sack;
10422         struct sctp_nr_sack_chunk *nr_sack;
10423         struct sctp_gap_ack_block *gap_descriptor;
10424         const struct sack_track *selector;
10425         int mergeable = 0;
10426         int offset;
10427         caddr_t limit;
10428         uint32_t *dup;
10429         int limit_reached = 0;
10430         unsigned int i, siz, j;
10431         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10432         int num_dups = 0;
10433         int space_req;
10434         uint32_t highest_tsn;
10435         uint8_t flags;
10436         uint8_t type;
10437         uint8_t tsn_map;
10438
10439         if (stcb->asoc.nrsack_supported == 1) {
10440                 type = SCTP_NR_SELECTIVE_ACK;
10441         } else {
10442                 type = SCTP_SELECTIVE_ACK;
10443         }
10444         a_chk = NULL;
10445         asoc = &stcb->asoc;
10446         SCTP_TCB_LOCK_ASSERT(stcb);
10447         if (asoc->last_data_chunk_from == NULL) {
10448                 /* Hmm we never received anything */
10449                 return;
10450         }
10451         sctp_slide_mapping_arrays(stcb);
10452         sctp_set_rwnd(stcb, asoc);
10453         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10454                 if (chk->rec.chunk_id.id == type) {
10455                         /* Hmm, found a sack already on queue, remove it */
10456                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10457                         asoc->ctrl_queue_cnt--;
10458                         a_chk = chk;
10459                         if (a_chk->data) {
10460                                 sctp_m_freem(a_chk->data);
10461                                 a_chk->data = NULL;
10462                         }
10463                         if (a_chk->whoTo) {
10464                                 sctp_free_remote_addr(a_chk->whoTo);
10465                                 a_chk->whoTo = NULL;
10466                         }
10467                         break;
10468                 }
10469         }
10470         if (a_chk == NULL) {
10471                 sctp_alloc_a_chunk(stcb, a_chk);
10472                 if (a_chk == NULL) {
10473                         /* No memory so we drop the idea, and set a timer */
10474                         if (stcb->asoc.delayed_ack) {
10475                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10476                                     stcb->sctp_ep, stcb, NULL,
10477                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10478                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10479                                     stcb->sctp_ep, stcb, NULL);
10480                         } else {
10481                                 stcb->asoc.send_sack = 1;
10482                         }
10483                         return;
10484                 }
10485                 a_chk->copy_by_ref = 0;
10486                 a_chk->rec.chunk_id.id = type;
10487                 a_chk->rec.chunk_id.can_take_data = 1;
10488         }
10489         /* Clear our pkt counts */
10490         asoc->data_pkts_seen = 0;
10491
10492         a_chk->flags = 0;
10493         a_chk->asoc = asoc;
10494         a_chk->snd_count = 0;
10495         a_chk->send_size = 0;   /* fill in later */
10496         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10497         a_chk->whoTo = NULL;
10498
10499         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10500                 /*-
10501                  * Ok, the destination for the SACK is unreachable, lets see if
10502                  * we can select an alternate to asoc->last_data_chunk_from
10503                  */
10504                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10505                 if (a_chk->whoTo == NULL) {
10506                         /* Nope, no alternate */
10507                         a_chk->whoTo = asoc->last_data_chunk_from;
10508                 }
10509         } else {
10510                 a_chk->whoTo = asoc->last_data_chunk_from;
10511         }
10512         if (a_chk->whoTo) {
10513                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10514         }
10515         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10516                 highest_tsn = asoc->highest_tsn_inside_map;
10517         } else {
10518                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10519         }
10520         if (highest_tsn == asoc->cumulative_tsn) {
10521                 /* no gaps */
10522                 if (type == SCTP_SELECTIVE_ACK) {
10523                         space_req = sizeof(struct sctp_sack_chunk);
10524                 } else {
10525                         space_req = sizeof(struct sctp_nr_sack_chunk);
10526                 }
10527         } else {
10528                 /* gaps get a cluster */
10529                 space_req = MCLBYTES;
10530         }
10531         /* Ok now lets formulate a MBUF with our sack */
10532         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10533         if ((a_chk->data == NULL) ||
10534             (a_chk->whoTo == NULL)) {
10535                 /* rats, no mbuf memory */
10536                 if (a_chk->data) {
10537                         /* was a problem with the destination */
10538                         sctp_m_freem(a_chk->data);
10539                         a_chk->data = NULL;
10540                 }
10541                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10542                 /* sa_ignore NO_NULL_CHK */
10543                 if (stcb->asoc.delayed_ack) {
10544                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10545                             stcb->sctp_ep, stcb, NULL,
10546                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10547                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10548                             stcb->sctp_ep, stcb, NULL);
10549                 } else {
10550                         stcb->asoc.send_sack = 1;
10551                 }
10552                 return;
10553         }
10554         /* ok, lets go through and fill it in */
10555         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10556         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10557         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10558                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10559         }
10560         limit = mtod(a_chk->data, caddr_t);
10561         limit += space;
10562
10563         flags = 0;
10564
10565         if ((asoc->sctp_cmt_on_off > 0) &&
10566             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10567                 /*-
10568                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10569                  * received, then set high bit to 1, else 0. Reset
10570                  * pkts_rcvd.
10571                  */
10572                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10573                 asoc->cmt_dac_pkts_rcvd = 0;
10574         }
10575 #ifdef SCTP_ASOCLOG_OF_TSNS
10576         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10577         stcb->asoc.cumack_log_atsnt++;
10578         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10579                 stcb->asoc.cumack_log_atsnt = 0;
10580         }
10581 #endif
10582         /* reset the readers interpretation */
10583         stcb->freed_by_sorcv_sincelast = 0;
10584
10585         if (type == SCTP_SELECTIVE_ACK) {
10586                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10587                 nr_sack = NULL;
10588                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10589                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10590                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10591                 } else {
10592                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10593                 }
10594         } else {
10595                 sack = NULL;
10596                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10597                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10598                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10599                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10600                 } else {
10601                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10602                 }
10603         }
10604
10605         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10606                 offset = 1;
10607         } else {
10608                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10609         }
10610         if (((type == SCTP_SELECTIVE_ACK) &&
10611             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10612             ((type == SCTP_NR_SELECTIVE_ACK) &&
10613             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10614                 /* we have a gap .. maybe */
10615                 for (i = 0; i < siz; i++) {
10616                         tsn_map = asoc->mapping_array[i];
10617                         if (type == SCTP_SELECTIVE_ACK) {
10618                                 tsn_map |= asoc->nr_mapping_array[i];
10619                         }
10620                         if (i == 0) {
10621                                 /*
10622                                  * Clear all bits corresponding to TSNs
10623                                  * smaller or equal to the cumulative TSN.
10624                                  */
10625                                 tsn_map &= (~0U << (1 - offset));
10626                         }
10627                         selector = &sack_array[tsn_map];
10628                         if (mergeable && selector->right_edge) {
10629                                 /*
10630                                  * Backup, left and right edges were ok to
10631                                  * merge.
10632                                  */
10633                                 num_gap_blocks--;
10634                                 gap_descriptor--;
10635                         }
10636                         if (selector->num_entries == 0)
10637                                 mergeable = 0;
10638                         else {
10639                                 for (j = 0; j < selector->num_entries; j++) {
10640                                         if (mergeable && selector->right_edge) {
10641                                                 /*
10642                                                  * do a merge by NOT setting
10643                                                  * the left side
10644                                                  */
10645                                                 mergeable = 0;
10646                                         } else {
10647                                                 /*
10648                                                  * no merge, set the left
10649                                                  * side
10650                                                  */
10651                                                 mergeable = 0;
10652                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10653                                         }
10654                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10655                                         num_gap_blocks++;
10656                                         gap_descriptor++;
10657                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10658                                                 /* no more room */
10659                                                 limit_reached = 1;
10660                                                 break;
10661                                         }
10662                                 }
10663                                 if (selector->left_edge) {
10664                                         mergeable = 1;
10665                                 }
10666                         }
10667                         if (limit_reached) {
10668                                 /* Reached the limit stop */
10669                                 break;
10670                         }
10671                         offset += 8;
10672                 }
10673         }
10674         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10675             (limit_reached == 0)) {
10676
10677                 mergeable = 0;
10678
10679                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10680                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10681                 } else {
10682                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10683                 }
10684
10685                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10686                         offset = 1;
10687                 } else {
10688                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10689                 }
10690                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10691                         /* we have a gap .. maybe */
10692                         for (i = 0; i < siz; i++) {
10693                                 tsn_map = asoc->nr_mapping_array[i];
10694                                 if (i == 0) {
10695                                         /*
10696                                          * Clear all bits corresponding to
10697                                          * TSNs smaller or equal to the
10698                                          * cumulative TSN.
10699                                          */
10700                                         tsn_map &= (~0U << (1 - offset));
10701                                 }
10702                                 selector = &sack_array[tsn_map];
10703                                 if (mergeable && selector->right_edge) {
10704                                         /*
10705                                          * Backup, left and right edges were
10706                                          * ok to merge.
10707                                          */
10708                                         num_nr_gap_blocks--;
10709                                         gap_descriptor--;
10710                                 }
10711                                 if (selector->num_entries == 0)
10712                                         mergeable = 0;
10713                                 else {
10714                                         for (j = 0; j < selector->num_entries; j++) {
10715                                                 if (mergeable && selector->right_edge) {
10716                                                         /*
10717                                                          * do a merge by NOT
10718                                                          * setting the left
10719                                                          * side
10720                                                          */
10721                                                         mergeable = 0;
10722                                                 } else {
10723                                                         /*
10724                                                          * no merge, set the
10725                                                          * left side
10726                                                          */
10727                                                         mergeable = 0;
10728                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10729                                                 }
10730                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10731                                                 num_nr_gap_blocks++;
10732                                                 gap_descriptor++;
10733                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10734                                                         /* no more room */
10735                                                         limit_reached = 1;
10736                                                         break;
10737                                                 }
10738                                         }
10739                                         if (selector->left_edge) {
10740                                                 mergeable = 1;
10741                                         }
10742                                 }
10743                                 if (limit_reached) {
10744                                         /* Reached the limit stop */
10745                                         break;
10746                                 }
10747                                 offset += 8;
10748                         }
10749                 }
10750         }
10751         /* now we must add any dups we are going to report. */
10752         if ((limit_reached == 0) && (asoc->numduptsns)) {
10753                 dup = (uint32_t *) gap_descriptor;
10754                 for (i = 0; i < asoc->numduptsns; i++) {
10755                         *dup = htonl(asoc->dup_tsns[i]);
10756                         dup++;
10757                         num_dups++;
10758                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10759                                 /* no more room */
10760                                 break;
10761                         }
10762                 }
10763                 asoc->numduptsns = 0;
10764         }
10765         /*
10766          * now that the chunk is prepared queue it to the control chunk
10767          * queue.
10768          */
10769         if (type == SCTP_SELECTIVE_ACK) {
10770                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_sack_chunk) +
10771                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10772                     num_dups * sizeof(int32_t));
10773                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10774                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10775                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10776                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10777                 sack->sack.num_dup_tsns = htons(num_dups);
10778                 sack->ch.chunk_type = type;
10779                 sack->ch.chunk_flags = flags;
10780                 sack->ch.chunk_length = htons(a_chk->send_size);
10781         } else {
10782                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_nr_sack_chunk) +
10783                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10784                     num_dups * sizeof(int32_t));
10785                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10786                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10787                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10788                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10789                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10790                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10791                 nr_sack->nr_sack.reserved = 0;
10792                 nr_sack->ch.chunk_type = type;
10793                 nr_sack->ch.chunk_flags = flags;
10794                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10795         }
10796         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10797         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10798         asoc->ctrl_queue_cnt++;
10799         asoc->send_sack = 0;
10800         SCTP_STAT_INCR(sctps_sendsacks);
10801         return;
10802 }
10803
10804 void
10805 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10806 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10807     SCTP_UNUSED
10808 #endif
10809 )
10810 {
10811         struct mbuf *m_abort, *m, *m_last;
10812         struct mbuf *m_out, *m_end = NULL;
10813         struct sctp_abort_chunk *abort;
10814         struct sctp_auth_chunk *auth = NULL;
10815         struct sctp_nets *net;
10816         uint32_t vtag;
10817         uint32_t auth_offset = 0;
10818         uint16_t cause_len, chunk_len, padding_len;
10819
10820         SCTP_TCB_LOCK_ASSERT(stcb);
10821         /*-
10822          * Add an AUTH chunk, if chunk requires it and save the offset into
10823          * the chain for AUTH
10824          */
10825         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10826             stcb->asoc.peer_auth_chunks)) {
10827                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10828                     stcb, SCTP_ABORT_ASSOCIATION);
10829                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10830         } else {
10831                 m_out = NULL;
10832         }
10833         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10834         if (m_abort == NULL) {
10835                 if (m_out) {
10836                         sctp_m_freem(m_out);
10837                 }
10838                 if (operr) {
10839                         sctp_m_freem(operr);
10840                 }
10841                 return;
10842         }
10843         /* link in any error */
10844         SCTP_BUF_NEXT(m_abort) = operr;
10845         cause_len = 0;
10846         m_last = NULL;
10847         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10848                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10849                 if (SCTP_BUF_NEXT(m) == NULL) {
10850                         m_last = m;
10851                 }
10852         }
10853         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10854         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10855         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10856         if (m_out == NULL) {
10857                 /* NO Auth chunk prepended, so reserve space in front */
10858                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10859                 m_out = m_abort;
10860         } else {
10861                 /* Put AUTH chunk at the front of the chain */
10862                 SCTP_BUF_NEXT(m_end) = m_abort;
10863         }
10864         if (stcb->asoc.alternate) {
10865                 net = stcb->asoc.alternate;
10866         } else {
10867                 net = stcb->asoc.primary_destination;
10868         }
10869         /* Fill in the ABORT chunk header. */
10870         abort = mtod(m_abort, struct sctp_abort_chunk *);
10871         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10872         if (stcb->asoc.peer_vtag == 0) {
10873                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10874                 vtag = stcb->asoc.my_vtag;
10875                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10876         } else {
10877                 vtag = stcb->asoc.peer_vtag;
10878                 abort->ch.chunk_flags = 0;
10879         }
10880         abort->ch.chunk_length = htons(chunk_len);
10881         /* Add padding, if necessary. */
10882         if (padding_len > 0) {
10883                 if ((m_last == NULL) ||
10884                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10885                         sctp_m_freem(m_out);
10886                         return;
10887                 }
10888         }
10889         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10890             (struct sockaddr *)&net->ro._l_addr,
10891             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10892             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10893             stcb->asoc.primary_destination->port, NULL,
10894             0, 0,
10895             so_locked);
10896         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10897 }
10898
10899 void
10900 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10901     struct sctp_nets *net,
10902     int reflect_vtag)
10903 {
10904         /* formulate and SEND a SHUTDOWN-COMPLETE */
10905         struct mbuf *m_shutdown_comp;
10906         struct sctp_shutdown_complete_chunk *shutdown_complete;
10907         uint32_t vtag;
10908         uint8_t flags;
10909
10910         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10911         if (m_shutdown_comp == NULL) {
10912                 /* no mbuf's */
10913                 return;
10914         }
10915         if (reflect_vtag) {
10916                 flags = SCTP_HAD_NO_TCB;
10917                 vtag = stcb->asoc.my_vtag;
10918         } else {
10919                 flags = 0;
10920                 vtag = stcb->asoc.peer_vtag;
10921         }
10922         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10923         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10924         shutdown_complete->ch.chunk_flags = flags;
10925         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10926         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10927         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10928             (struct sockaddr *)&net->ro._l_addr,
10929             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10930             stcb->sctp_ep->sctp_lport, stcb->rport,
10931             htonl(vtag),
10932             net->port, NULL,
10933             0, 0,
10934             SCTP_SO_NOT_LOCKED);
10935         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10936         return;
10937 }
10938
10939 static void
10940 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10941     struct sctphdr *sh, uint32_t vtag,
10942     uint8_t type, struct mbuf *cause,
10943     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10944     uint32_t vrf_id, uint16_t port)
10945 {
10946         struct mbuf *o_pak;
10947         struct mbuf *mout;
10948         struct sctphdr *shout;
10949         struct sctp_chunkhdr *ch;
10950 #if defined(INET) || defined(INET6)
10951         struct udphdr *udp;
10952         int ret;
10953 #endif
10954         int len, cause_len, padding_len;
10955 #ifdef INET
10956         struct sockaddr_in *src_sin, *dst_sin;
10957         struct ip *ip;
10958 #endif
10959 #ifdef INET6
10960         struct sockaddr_in6 *src_sin6, *dst_sin6;
10961         struct ip6_hdr *ip6;
10962 #endif
10963
10964         /* Compute the length of the cause and add final padding. */
10965         cause_len = 0;
10966         if (cause != NULL) {
10967                 struct mbuf *m_at, *m_last = NULL;
10968
10969                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10970                         if (SCTP_BUF_NEXT(m_at) == NULL)
10971                                 m_last = m_at;
10972                         cause_len += SCTP_BUF_LEN(m_at);
10973                 }
10974                 padding_len = cause_len % 4;
10975                 if (padding_len != 0) {
10976                         padding_len = 4 - padding_len;
10977                 }
10978                 if (padding_len != 0) {
10979                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10980                                 sctp_m_freem(cause);
10981                                 return;
10982                         }
10983                 }
10984         } else {
10985                 padding_len = 0;
10986         }
10987         /* Get an mbuf for the header. */
10988         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10989         switch (dst->sa_family) {
10990 #ifdef INET
10991         case AF_INET:
10992                 len += sizeof(struct ip);
10993                 break;
10994 #endif
10995 #ifdef INET6
10996         case AF_INET6:
10997                 len += sizeof(struct ip6_hdr);
10998                 break;
10999 #endif
11000         default:
11001                 break;
11002         }
11003 #if defined(INET) || defined(INET6)
11004         if (port) {
11005                 len += sizeof(struct udphdr);
11006         }
11007 #endif
11008         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11009         if (mout == NULL) {
11010                 if (cause) {
11011                         sctp_m_freem(cause);
11012                 }
11013                 return;
11014         }
11015         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11016         SCTP_BUF_LEN(mout) = len;
11017         SCTP_BUF_NEXT(mout) = cause;
11018         M_SETFIB(mout, fibnum);
11019         mout->m_pkthdr.flowid = mflowid;
11020         M_HASHTYPE_SET(mout, mflowtype);
11021 #ifdef INET
11022         ip = NULL;
11023 #endif
11024 #ifdef INET6
11025         ip6 = NULL;
11026 #endif
11027         switch (dst->sa_family) {
11028 #ifdef INET
11029         case AF_INET:
11030                 src_sin = (struct sockaddr_in *)src;
11031                 dst_sin = (struct sockaddr_in *)dst;
11032                 ip = mtod(mout, struct ip *);
11033                 ip->ip_v = IPVERSION;
11034                 ip->ip_hl = (sizeof(struct ip) >> 2);
11035                 ip->ip_tos = 0;
11036                 ip->ip_off = 0;
11037                 ip_fillid(ip);
11038                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11039                 if (port) {
11040                         ip->ip_p = IPPROTO_UDP;
11041                 } else {
11042                         ip->ip_p = IPPROTO_SCTP;
11043                 }
11044                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11045                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11046                 ip->ip_sum = 0;
11047                 len = sizeof(struct ip);
11048                 shout = (struct sctphdr *)((caddr_t)ip + len);
11049                 break;
11050 #endif
11051 #ifdef INET6
11052         case AF_INET6:
11053                 src_sin6 = (struct sockaddr_in6 *)src;
11054                 dst_sin6 = (struct sockaddr_in6 *)dst;
11055                 ip6 = mtod(mout, struct ip6_hdr *);
11056                 ip6->ip6_flow = htonl(0x60000000);
11057                 if (V_ip6_auto_flowlabel) {
11058                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11059                 }
11060                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11061                 if (port) {
11062                         ip6->ip6_nxt = IPPROTO_UDP;
11063                 } else {
11064                         ip6->ip6_nxt = IPPROTO_SCTP;
11065                 }
11066                 ip6->ip6_src = dst_sin6->sin6_addr;
11067                 ip6->ip6_dst = src_sin6->sin6_addr;
11068                 len = sizeof(struct ip6_hdr);
11069                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11070                 break;
11071 #endif
11072         default:
11073                 len = 0;
11074                 shout = mtod(mout, struct sctphdr *);
11075                 break;
11076         }
11077 #if defined(INET) || defined(INET6)
11078         if (port) {
11079                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11080                         sctp_m_freem(mout);
11081                         return;
11082                 }
11083                 udp = (struct udphdr *)shout;
11084                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11085                 udp->uh_dport = port;
11086                 udp->uh_sum = 0;
11087                 udp->uh_ulen = htons((uint16_t) (sizeof(struct udphdr) +
11088                     sizeof(struct sctphdr) +
11089                     sizeof(struct sctp_chunkhdr) +
11090                     cause_len + padding_len));
11091                 len += sizeof(struct udphdr);
11092                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11093         } else {
11094                 udp = NULL;
11095         }
11096 #endif
11097         shout->src_port = sh->dest_port;
11098         shout->dest_port = sh->src_port;
11099         shout->checksum = 0;
11100         if (vtag) {
11101                 shout->v_tag = htonl(vtag);
11102         } else {
11103                 shout->v_tag = sh->v_tag;
11104         }
11105         len += sizeof(struct sctphdr);
11106         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11107         ch->chunk_type = type;
11108         if (vtag) {
11109                 ch->chunk_flags = 0;
11110         } else {
11111                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11112         }
11113         ch->chunk_length = htons((uint16_t) (sizeof(struct sctp_chunkhdr) + cause_len));
11114         len += sizeof(struct sctp_chunkhdr);
11115         len += cause_len + padding_len;
11116
11117         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11118                 sctp_m_freem(mout);
11119                 return;
11120         }
11121         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11122         switch (dst->sa_family) {
11123 #ifdef INET
11124         case AF_INET:
11125                 if (port) {
11126                         if (V_udp_cksum) {
11127                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11128                         } else {
11129                                 udp->uh_sum = 0;
11130                         }
11131                 }
11132                 ip->ip_len = htons(len);
11133                 if (port) {
11134 #if defined(SCTP_WITH_NO_CSUM)
11135                         SCTP_STAT_INCR(sctps_sendnocrc);
11136 #else
11137                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11138                         SCTP_STAT_INCR(sctps_sendswcrc);
11139 #endif
11140                         if (V_udp_cksum) {
11141                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11142                         }
11143                 } else {
11144 #if defined(SCTP_WITH_NO_CSUM)
11145                         SCTP_STAT_INCR(sctps_sendnocrc);
11146 #else
11147                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11148                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11149                         SCTP_STAT_INCR(sctps_sendhwcrc);
11150 #endif
11151                 }
11152 #ifdef SCTP_PACKET_LOGGING
11153                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11154                         sctp_packet_log(o_pak);
11155                 }
11156 #endif
11157                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11158                 break;
11159 #endif
11160 #ifdef INET6
11161         case AF_INET6:
11162                 ip6->ip6_plen = (uint16_t) (len - sizeof(struct ip6_hdr));
11163                 if (port) {
11164 #if defined(SCTP_WITH_NO_CSUM)
11165                         SCTP_STAT_INCR(sctps_sendnocrc);
11166 #else
11167                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11168                         SCTP_STAT_INCR(sctps_sendswcrc);
11169 #endif
11170                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11171                                 udp->uh_sum = 0xffff;
11172                         }
11173                 } else {
11174 #if defined(SCTP_WITH_NO_CSUM)
11175                         SCTP_STAT_INCR(sctps_sendnocrc);
11176 #else
11177                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11178                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11179                         SCTP_STAT_INCR(sctps_sendhwcrc);
11180 #endif
11181                 }
11182 #ifdef SCTP_PACKET_LOGGING
11183                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11184                         sctp_packet_log(o_pak);
11185                 }
11186 #endif
11187                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11188                 break;
11189 #endif
11190         default:
11191                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11192                     dst->sa_family);
11193                 sctp_m_freem(mout);
11194                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11195                 return;
11196         }
11197         SCTP_STAT_INCR(sctps_sendpackets);
11198         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11199         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11200         return;
11201 }
11202
11203 void
11204 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11205     struct sctphdr *sh,
11206     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11207     uint32_t vrf_id, uint16_t port)
11208 {
11209         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11210             mflowtype, mflowid, fibnum,
11211             vrf_id, port);
11212 }
11213
11214 void
11215 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11216 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11217     SCTP_UNUSED
11218 #endif
11219 )
11220 {
11221         struct sctp_tmit_chunk *chk;
11222         struct sctp_heartbeat_chunk *hb;
11223         struct timeval now;
11224
11225         SCTP_TCB_LOCK_ASSERT(stcb);
11226         if (net == NULL) {
11227                 return;
11228         }
11229         (void)SCTP_GETTIME_TIMEVAL(&now);
11230         switch (net->ro._l_addr.sa.sa_family) {
11231 #ifdef INET
11232         case AF_INET:
11233                 break;
11234 #endif
11235 #ifdef INET6
11236         case AF_INET6:
11237                 break;
11238 #endif
11239         default:
11240                 return;
11241         }
11242         sctp_alloc_a_chunk(stcb, chk);
11243         if (chk == NULL) {
11244                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11245                 return;
11246         }
11247         chk->copy_by_ref = 0;
11248         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11249         chk->rec.chunk_id.can_take_data = 1;
11250         chk->flags = 0;
11251         chk->asoc = &stcb->asoc;
11252         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11253
11254         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11255         if (chk->data == NULL) {
11256                 sctp_free_a_chunk(stcb, chk, so_locked);
11257                 return;
11258         }
11259         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11260         SCTP_BUF_LEN(chk->data) = chk->send_size;
11261         chk->sent = SCTP_DATAGRAM_UNSENT;
11262         chk->snd_count = 0;
11263         chk->whoTo = net;
11264         atomic_add_int(&chk->whoTo->ref_count, 1);
11265         /* Now we have a mbuf that we can fill in with the details */
11266         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11267         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11268         /* fill out chunk header */
11269         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11270         hb->ch.chunk_flags = 0;
11271         hb->ch.chunk_length = htons(chk->send_size);
11272         /* Fill out hb parameter */
11273         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11274         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11275         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11276         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11277         /* Did our user request this one, put it in */
11278         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11279         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11280         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11281                 /*
11282                  * we only take from the entropy pool if the address is not
11283                  * confirmed.
11284                  */
11285                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11286                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11287         } else {
11288                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11289                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11290         }
11291         switch (net->ro._l_addr.sa.sa_family) {
11292 #ifdef INET
11293         case AF_INET:
11294                 memcpy(hb->heartbeat.hb_info.address,
11295                     &net->ro._l_addr.sin.sin_addr,
11296                     sizeof(net->ro._l_addr.sin.sin_addr));
11297                 break;
11298 #endif
11299 #ifdef INET6
11300         case AF_INET6:
11301                 memcpy(hb->heartbeat.hb_info.address,
11302                     &net->ro._l_addr.sin6.sin6_addr,
11303                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11304                 break;
11305 #endif
11306         default:
11307                 if (chk->data) {
11308                         sctp_m_freem(chk->data);
11309                         chk->data = NULL;
11310                 }
11311                 sctp_free_a_chunk(stcb, chk, so_locked);
11312                 return;
11313                 break;
11314         }
11315         net->hb_responded = 0;
11316         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11317         stcb->asoc.ctrl_queue_cnt++;
11318         SCTP_STAT_INCR(sctps_sendheartbeat);
11319         return;
11320 }
11321
11322 void
11323 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11324     uint32_t high_tsn)
11325 {
11326         struct sctp_association *asoc;
11327         struct sctp_ecne_chunk *ecne;
11328         struct sctp_tmit_chunk *chk;
11329
11330         if (net == NULL) {
11331                 return;
11332         }
11333         asoc = &stcb->asoc;
11334         SCTP_TCB_LOCK_ASSERT(stcb);
11335         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11336                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11337                         /* found a previous ECN_ECHO update it if needed */
11338                         uint32_t cnt, ctsn;
11339
11340                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11341                         ctsn = ntohl(ecne->tsn);
11342                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11343                                 ecne->tsn = htonl(high_tsn);
11344                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11345                         }
11346                         cnt = ntohl(ecne->num_pkts_since_cwr);
11347                         cnt++;
11348                         ecne->num_pkts_since_cwr = htonl(cnt);
11349                         return;
11350                 }
11351         }
11352         /* nope could not find one to update so we must build one */
11353         sctp_alloc_a_chunk(stcb, chk);
11354         if (chk == NULL) {
11355                 return;
11356         }
11357         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11358         chk->copy_by_ref = 0;
11359         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11360         chk->rec.chunk_id.can_take_data = 0;
11361         chk->flags = 0;
11362         chk->asoc = &stcb->asoc;
11363         chk->send_size = sizeof(struct sctp_ecne_chunk);
11364         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11365         if (chk->data == NULL) {
11366                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11367                 return;
11368         }
11369         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11370         SCTP_BUF_LEN(chk->data) = chk->send_size;
11371         chk->sent = SCTP_DATAGRAM_UNSENT;
11372         chk->snd_count = 0;
11373         chk->whoTo = net;
11374         atomic_add_int(&chk->whoTo->ref_count, 1);
11375
11376         stcb->asoc.ecn_echo_cnt_onq++;
11377         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11378         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11379         ecne->ch.chunk_flags = 0;
11380         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11381         ecne->tsn = htonl(high_tsn);
11382         ecne->num_pkts_since_cwr = htonl(1);
11383         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11384         asoc->ctrl_queue_cnt++;
11385 }
11386
11387 void
11388 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11389     struct mbuf *m, int len, int iphlen, int bad_crc)
11390 {
11391         struct sctp_association *asoc;
11392         struct sctp_pktdrop_chunk *drp;
11393         struct sctp_tmit_chunk *chk;
11394         uint8_t *datap;
11395         int was_trunc = 0;
11396         int fullsz = 0;
11397         long spc;
11398         int offset;
11399         struct sctp_chunkhdr *ch, chunk_buf;
11400         unsigned int chk_length;
11401
11402         if (!stcb) {
11403                 return;
11404         }
11405         asoc = &stcb->asoc;
11406         SCTP_TCB_LOCK_ASSERT(stcb);
11407         if (asoc->pktdrop_supported == 0) {
11408                 /*-
11409                  * peer must declare support before I send one.
11410                  */
11411                 return;
11412         }
11413         if (stcb->sctp_socket == NULL) {
11414                 return;
11415         }
11416         sctp_alloc_a_chunk(stcb, chk);
11417         if (chk == NULL) {
11418                 return;
11419         }
11420         chk->copy_by_ref = 0;
11421         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11422         chk->rec.chunk_id.can_take_data = 1;
11423         chk->flags = 0;
11424         len -= iphlen;
11425         chk->send_size = len;
11426         /* Validate that we do not have an ABORT in here. */
11427         offset = iphlen + sizeof(struct sctphdr);
11428         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11429             sizeof(*ch), (uint8_t *) & chunk_buf);
11430         while (ch != NULL) {
11431                 chk_length = ntohs(ch->chunk_length);
11432                 if (chk_length < sizeof(*ch)) {
11433                         /* break to abort land */
11434                         break;
11435                 }
11436                 switch (ch->chunk_type) {
11437                 case SCTP_PACKET_DROPPED:
11438                 case SCTP_ABORT_ASSOCIATION:
11439                 case SCTP_INITIATION_ACK:
11440                         /**
11441                          * We don't respond with an PKT-DROP to an ABORT
11442                          * or PKT-DROP. We also do not respond to an
11443                          * INIT-ACK, because we can't know if the initiation
11444                          * tag is correct or not.
11445                          */
11446                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11447                         return;
11448                 default:
11449                         break;
11450                 }
11451                 offset += SCTP_SIZE32(chk_length);
11452                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11453                     sizeof(*ch), (uint8_t *) & chunk_buf);
11454         }
11455
11456         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11457             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11458                 /*
11459                  * only send 1 mtu worth, trim off the excess on the end.
11460                  */
11461                 fullsz = len;
11462                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11463                 was_trunc = 1;
11464         }
11465         chk->asoc = &stcb->asoc;
11466         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11467         if (chk->data == NULL) {
11468 jump_out:
11469                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11470                 return;
11471         }
11472         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11473         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11474         if (drp == NULL) {
11475                 sctp_m_freem(chk->data);
11476                 chk->data = NULL;
11477                 goto jump_out;
11478         }
11479         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11480             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11481         chk->book_size_scale = 0;
11482         if (was_trunc) {
11483                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11484                 drp->trunc_len = htons(fullsz);
11485                 /*
11486                  * Len is already adjusted to size minus overhead above take
11487                  * out the pkt_drop chunk itself from it.
11488                  */
11489                 chk->send_size = (uint16_t) (len - sizeof(struct sctp_pktdrop_chunk));
11490                 len = chk->send_size;
11491         } else {
11492                 /* no truncation needed */
11493                 drp->ch.chunk_flags = 0;
11494                 drp->trunc_len = htons(0);
11495         }
11496         if (bad_crc) {
11497                 drp->ch.chunk_flags |= SCTP_BADCRC;
11498         }
11499         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11500         SCTP_BUF_LEN(chk->data) = chk->send_size;
11501         chk->sent = SCTP_DATAGRAM_UNSENT;
11502         chk->snd_count = 0;
11503         if (net) {
11504                 /* we should hit here */
11505                 chk->whoTo = net;
11506                 atomic_add_int(&chk->whoTo->ref_count, 1);
11507         } else {
11508                 chk->whoTo = NULL;
11509         }
11510         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11511         drp->ch.chunk_length = htons(chk->send_size);
11512         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11513         if (spc < 0) {
11514                 spc = 0;
11515         }
11516         drp->bottle_bw = htonl(spc);
11517         if (asoc->my_rwnd) {
11518                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11519                     asoc->size_on_all_streams +
11520                     asoc->my_rwnd_control_len +
11521                     stcb->sctp_socket->so_rcv.sb_cc);
11522         } else {
11523                 /*-
11524                  * If my rwnd is 0, possibly from mbuf depletion as well as
11525                  * space used, tell the peer there is NO space aka onq == bw
11526                  */
11527                 drp->current_onq = htonl(spc);
11528         }
11529         drp->reserved = 0;
11530         datap = drp->data;
11531         m_copydata(m, iphlen, len, (caddr_t)datap);
11532         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11533         asoc->ctrl_queue_cnt++;
11534 }
11535
11536 void
11537 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11538 {
11539         struct sctp_association *asoc;
11540         struct sctp_cwr_chunk *cwr;
11541         struct sctp_tmit_chunk *chk;
11542
11543         SCTP_TCB_LOCK_ASSERT(stcb);
11544         if (net == NULL) {
11545                 return;
11546         }
11547         asoc = &stcb->asoc;
11548         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11549                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11550                         /* found a previous CWR queued to same destination
11551                          * update it if needed */
11552                         uint32_t ctsn;
11553
11554                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11555                         ctsn = ntohl(cwr->tsn);
11556                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11557                                 cwr->tsn = htonl(high_tsn);
11558                         }
11559                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11560                                 /* Make sure override is carried */
11561                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11562                         }
11563                         return;
11564                 }
11565         }
11566         sctp_alloc_a_chunk(stcb, chk);
11567         if (chk == NULL) {
11568                 return;
11569         }
11570         chk->copy_by_ref = 0;
11571         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11572         chk->rec.chunk_id.can_take_data = 1;
11573         chk->flags = 0;
11574         chk->asoc = &stcb->asoc;
11575         chk->send_size = sizeof(struct sctp_cwr_chunk);
11576         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11577         if (chk->data == NULL) {
11578                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11579                 return;
11580         }
11581         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11582         SCTP_BUF_LEN(chk->data) = chk->send_size;
11583         chk->sent = SCTP_DATAGRAM_UNSENT;
11584         chk->snd_count = 0;
11585         chk->whoTo = net;
11586         atomic_add_int(&chk->whoTo->ref_count, 1);
11587         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11588         cwr->ch.chunk_type = SCTP_ECN_CWR;
11589         cwr->ch.chunk_flags = override;
11590         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11591         cwr->tsn = htonl(high_tsn);
11592         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11593         asoc->ctrl_queue_cnt++;
11594 }
11595
11596 static int
11597 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11598     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11599 {
11600         uint16_t len, old_len, i;
11601         struct sctp_stream_reset_out_request *req_out;
11602         struct sctp_chunkhdr *ch;
11603         int at;
11604         int number_entries = 0;
11605
11606         ch = mtod(chk->data, struct sctp_chunkhdr *);
11607         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11608         /* get to new offset for the param. */
11609         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11610         /* now how long will this param be? */
11611         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11612                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11613                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11614                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11615                         number_entries++;
11616                 }
11617         }
11618         if (number_entries == 0) {
11619                 return (0);
11620         }
11621         if (number_entries == stcb->asoc.streamoutcnt) {
11622                 number_entries = 0;
11623         }
11624         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11625                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11626         }
11627         len = (uint16_t) (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11628         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11629         req_out->ph.param_length = htons(len);
11630         req_out->request_seq = htonl(seq);
11631         req_out->response_seq = htonl(resp_seq);
11632         req_out->send_reset_at_tsn = htonl(last_sent);
11633         at = 0;
11634         if (number_entries) {
11635                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11636                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11637                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11638                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11639                                 req_out->list_of_streams[at] = htons(i);
11640                                 at++;
11641                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11642                                 if (at >= number_entries) {
11643                                         break;
11644                                 }
11645                         }
11646                 }
11647         } else {
11648                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11649                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11650                 }
11651         }
11652         if (SCTP_SIZE32(len) > len) {
11653                 /*-
11654                  * Need to worry about the pad we may end up adding to the
11655                  * end. This is easy since the struct is either aligned to 4
11656                  * bytes or 2 bytes off.
11657                  */
11658                 req_out->list_of_streams[number_entries] = 0;
11659         }
11660         /* now fix the chunk length */
11661         ch->chunk_length = htons(len + old_len);
11662         chk->book_size = len + old_len;
11663         chk->book_size_scale = 0;
11664         chk->send_size = SCTP_SIZE32(chk->book_size);
11665         SCTP_BUF_LEN(chk->data) = chk->send_size;
11666         return (1);
11667 }
11668
11669 static void
11670 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11671     int number_entries, uint16_t * list,
11672     uint32_t seq)
11673 {
11674         uint16_t len, old_len, i;
11675         struct sctp_stream_reset_in_request *req_in;
11676         struct sctp_chunkhdr *ch;
11677
11678         ch = mtod(chk->data, struct sctp_chunkhdr *);
11679         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11680
11681         /* get to new offset for the param. */
11682         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11683         /* now how long will this param be? */
11684         len = (uint16_t) (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11685         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11686         req_in->ph.param_length = htons(len);
11687         req_in->request_seq = htonl(seq);
11688         if (number_entries) {
11689                 for (i = 0; i < number_entries; i++) {
11690                         req_in->list_of_streams[i] = htons(list[i]);
11691                 }
11692         }
11693         if (SCTP_SIZE32(len) > len) {
11694                 /*-
11695                  * Need to worry about the pad we may end up adding to the
11696                  * end. This is easy since the struct is either aligned to 4
11697                  * bytes or 2 bytes off.
11698                  */
11699                 req_in->list_of_streams[number_entries] = 0;
11700         }
11701         /* now fix the chunk length */
11702         ch->chunk_length = htons(len + old_len);
11703         chk->book_size = len + old_len;
11704         chk->book_size_scale = 0;
11705         chk->send_size = SCTP_SIZE32(chk->book_size);
11706         SCTP_BUF_LEN(chk->data) = chk->send_size;
11707         return;
11708 }
11709
11710 static void
11711 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11712     uint32_t seq)
11713 {
11714         uint16_t len, old_len;
11715         struct sctp_stream_reset_tsn_request *req_tsn;
11716         struct sctp_chunkhdr *ch;
11717
11718         ch = mtod(chk->data, struct sctp_chunkhdr *);
11719         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11720
11721         /* get to new offset for the param. */
11722         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11723         /* now how long will this param be? */
11724         len = sizeof(struct sctp_stream_reset_tsn_request);
11725         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11726         req_tsn->ph.param_length = htons(len);
11727         req_tsn->request_seq = htonl(seq);
11728
11729         /* now fix the chunk length */
11730         ch->chunk_length = htons(len + old_len);
11731         chk->send_size = len + old_len;
11732         chk->book_size = SCTP_SIZE32(chk->send_size);
11733         chk->book_size_scale = 0;
11734         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11735         return;
11736 }
11737
11738 void
11739 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11740     uint32_t resp_seq, uint32_t result)
11741 {
11742         uint16_t len, old_len;
11743         struct sctp_stream_reset_response *resp;
11744         struct sctp_chunkhdr *ch;
11745
11746         ch = mtod(chk->data, struct sctp_chunkhdr *);
11747         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11748
11749         /* get to new offset for the param. */
11750         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11751         /* now how long will this param be? */
11752         len = sizeof(struct sctp_stream_reset_response);
11753         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11754         resp->ph.param_length = htons(len);
11755         resp->response_seq = htonl(resp_seq);
11756         resp->result = ntohl(result);
11757
11758         /* now fix the chunk length */
11759         ch->chunk_length = htons(len + old_len);
11760         chk->book_size = len + old_len;
11761         chk->book_size_scale = 0;
11762         chk->send_size = SCTP_SIZE32(chk->book_size);
11763         SCTP_BUF_LEN(chk->data) = chk->send_size;
11764         return;
11765 }
11766
11767 void
11768 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11769     struct sctp_stream_reset_list *ent,
11770     int response)
11771 {
11772         struct sctp_association *asoc;
11773         struct sctp_tmit_chunk *chk;
11774         struct sctp_chunkhdr *ch;
11775
11776         asoc = &stcb->asoc;
11777
11778         /*
11779          * Reset our last reset action to the new one IP -> response
11780          * (PERFORMED probably). This assures that if we fail to send, a
11781          * retran from the peer will get the new response.
11782          */
11783         asoc->last_reset_action[0] = response;
11784         if (asoc->stream_reset_outstanding) {
11785                 return;
11786         }
11787         sctp_alloc_a_chunk(stcb, chk);
11788         if (chk == NULL) {
11789                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11790                 return;
11791         }
11792         chk->copy_by_ref = 0;
11793         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11794         chk->rec.chunk_id.can_take_data = 0;
11795         chk->flags = 0;
11796         chk->asoc = &stcb->asoc;
11797         chk->book_size = sizeof(struct sctp_chunkhdr);
11798         chk->send_size = SCTP_SIZE32(chk->book_size);
11799         chk->book_size_scale = 0;
11800         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11801         if (chk->data == NULL) {
11802                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11803                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11804                 return;
11805         }
11806         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11807         /* setup chunk parameters */
11808         chk->sent = SCTP_DATAGRAM_UNSENT;
11809         chk->snd_count = 0;
11810         if (stcb->asoc.alternate) {
11811                 chk->whoTo = stcb->asoc.alternate;
11812         } else {
11813                 chk->whoTo = stcb->asoc.primary_destination;
11814         }
11815         ch = mtod(chk->data, struct sctp_chunkhdr *);
11816         ch->chunk_type = SCTP_STREAM_RESET;
11817         ch->chunk_flags = 0;
11818         ch->chunk_length = htons(chk->book_size);
11819         atomic_add_int(&chk->whoTo->ref_count, 1);
11820         SCTP_BUF_LEN(chk->data) = chk->send_size;
11821         sctp_add_stream_reset_result(chk, ent->seq, response);
11822         /* insert the chunk for sending */
11823         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11824             chk,
11825             sctp_next);
11826         asoc->ctrl_queue_cnt++;
11827 }
11828
11829 void
11830 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11831     uint32_t resp_seq, uint32_t result,
11832     uint32_t send_una, uint32_t recv_next)
11833 {
11834         uint16_t len, old_len;
11835         struct sctp_stream_reset_response_tsn *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_tsn *)((caddr_t)ch + len);
11843         /* now how long will this param be? */
11844         len = sizeof(struct sctp_stream_reset_response_tsn);
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 = htonl(result);
11849         resp->senders_next_tsn = htonl(send_una);
11850         resp->receivers_next_tsn = htonl(recv_next);
11851
11852         /* now fix the chunk length */
11853         ch->chunk_length = htons(len + old_len);
11854         chk->book_size = len + old_len;
11855         chk->send_size = SCTP_SIZE32(chk->book_size);
11856         chk->book_size_scale = 0;
11857         SCTP_BUF_LEN(chk->data) = chk->send_size;
11858         return;
11859 }
11860
11861 static void
11862 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11863     uint32_t seq,
11864     uint16_t adding)
11865 {
11866         uint16_t len, old_len;
11867         struct sctp_chunkhdr *ch;
11868         struct sctp_stream_reset_add_strm *addstr;
11869
11870         ch = mtod(chk->data, struct sctp_chunkhdr *);
11871         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11872
11873         /* get to new offset for the param. */
11874         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11875         /* now how long will this param be? */
11876         len = sizeof(struct sctp_stream_reset_add_strm);
11877
11878         /* Fill it out. */
11879         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11880         addstr->ph.param_length = htons(len);
11881         addstr->request_seq = htonl(seq);
11882         addstr->number_of_streams = htons(adding);
11883         addstr->reserved = 0;
11884
11885         /* now fix the chunk length */
11886         ch->chunk_length = htons(len + old_len);
11887         chk->send_size = len + old_len;
11888         chk->book_size = SCTP_SIZE32(chk->send_size);
11889         chk->book_size_scale = 0;
11890         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11891         return;
11892 }
11893
11894 static void
11895 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11896     uint32_t seq,
11897     uint16_t adding)
11898 {
11899         uint16_t len, old_len;
11900         struct sctp_chunkhdr *ch;
11901         struct sctp_stream_reset_add_strm *addstr;
11902
11903         ch = mtod(chk->data, struct sctp_chunkhdr *);
11904         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11905
11906         /* get to new offset for the param. */
11907         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11908         /* now how long will this param be? */
11909         len = sizeof(struct sctp_stream_reset_add_strm);
11910         /* Fill it out. */
11911         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11912         addstr->ph.param_length = htons(len);
11913         addstr->request_seq = htonl(seq);
11914         addstr->number_of_streams = htons(adding);
11915         addstr->reserved = 0;
11916
11917         /* now fix the chunk length */
11918         ch->chunk_length = htons(len + old_len);
11919         chk->send_size = len + old_len;
11920         chk->book_size = SCTP_SIZE32(chk->send_size);
11921         chk->book_size_scale = 0;
11922         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11923         return;
11924 }
11925
11926 int
11927 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11928 {
11929         struct sctp_association *asoc;
11930         struct sctp_tmit_chunk *chk;
11931         struct sctp_chunkhdr *ch;
11932         uint32_t seq;
11933
11934         asoc = &stcb->asoc;
11935         asoc->trigger_reset = 0;
11936         if (asoc->stream_reset_outstanding) {
11937                 return (EALREADY);
11938         }
11939         sctp_alloc_a_chunk(stcb, chk);
11940         if (chk == NULL) {
11941                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11942                 return (ENOMEM);
11943         }
11944         chk->copy_by_ref = 0;
11945         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11946         chk->rec.chunk_id.can_take_data = 0;
11947         chk->flags = 0;
11948         chk->asoc = &stcb->asoc;
11949         chk->book_size = sizeof(struct sctp_chunkhdr);
11950         chk->send_size = SCTP_SIZE32(chk->book_size);
11951         chk->book_size_scale = 0;
11952         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11953         if (chk->data == NULL) {
11954                 sctp_free_a_chunk(stcb, chk, so_locked);
11955                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11956                 return (ENOMEM);
11957         }
11958         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11959
11960         /* setup chunk parameters */
11961         chk->sent = SCTP_DATAGRAM_UNSENT;
11962         chk->snd_count = 0;
11963         if (stcb->asoc.alternate) {
11964                 chk->whoTo = stcb->asoc.alternate;
11965         } else {
11966                 chk->whoTo = stcb->asoc.primary_destination;
11967         }
11968         ch = mtod(chk->data, struct sctp_chunkhdr *);
11969         ch->chunk_type = SCTP_STREAM_RESET;
11970         ch->chunk_flags = 0;
11971         ch->chunk_length = htons(chk->book_size);
11972         atomic_add_int(&chk->whoTo->ref_count, 1);
11973         SCTP_BUF_LEN(chk->data) = chk->send_size;
11974         seq = stcb->asoc.str_reset_seq_out;
11975         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11976                 seq++;
11977                 asoc->stream_reset_outstanding++;
11978         } else {
11979                 m_freem(chk->data);
11980                 chk->data = NULL;
11981                 sctp_free_a_chunk(stcb, chk, so_locked);
11982                 return (ENOENT);
11983         }
11984         asoc->str_reset = chk;
11985         /* insert the chunk for sending */
11986         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11987             chk,
11988             sctp_next);
11989         asoc->ctrl_queue_cnt++;
11990
11991         if (stcb->asoc.send_sack) {
11992                 sctp_send_sack(stcb, so_locked);
11993         }
11994         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11995         return (0);
11996 }
11997
11998 int
11999 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12000     uint16_t number_entries, uint16_t * list,
12001     uint8_t send_in_req,
12002     uint8_t send_tsn_req,
12003     uint8_t add_stream,
12004     uint16_t adding_o,
12005     uint16_t adding_i, uint8_t peer_asked)
12006 {
12007         struct sctp_association *asoc;
12008         struct sctp_tmit_chunk *chk;
12009         struct sctp_chunkhdr *ch;
12010         int can_send_out_req = 0;
12011         uint32_t seq;
12012
12013         asoc = &stcb->asoc;
12014         if (asoc->stream_reset_outstanding) {
12015                 /*-
12016                  * Already one pending, must get ACK back to clear the flag.
12017                  */
12018                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12019                 return (EBUSY);
12020         }
12021         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12022             (add_stream == 0)) {
12023                 /* nothing to do */
12024                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12025                 return (EINVAL);
12026         }
12027         if (send_tsn_req && send_in_req) {
12028                 /* error, can't do that */
12029                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12030                 return (EINVAL);
12031         } else if (send_in_req) {
12032                 can_send_out_req = 1;
12033         }
12034         if (number_entries > (MCLBYTES -
12035             SCTP_MIN_OVERHEAD -
12036             sizeof(struct sctp_chunkhdr) -
12037             sizeof(struct sctp_stream_reset_out_request)) /
12038             sizeof(uint16_t)) {
12039                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12040                 return (ENOMEM);
12041         }
12042         sctp_alloc_a_chunk(stcb, chk);
12043         if (chk == NULL) {
12044                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12045                 return (ENOMEM);
12046         }
12047         chk->copy_by_ref = 0;
12048         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12049         chk->rec.chunk_id.can_take_data = 0;
12050         chk->flags = 0;
12051         chk->asoc = &stcb->asoc;
12052         chk->book_size = sizeof(struct sctp_chunkhdr);
12053         chk->send_size = SCTP_SIZE32(chk->book_size);
12054         chk->book_size_scale = 0;
12055
12056         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12057         if (chk->data == NULL) {
12058                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12059                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12060                 return (ENOMEM);
12061         }
12062         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12063
12064         /* setup chunk parameters */
12065         chk->sent = SCTP_DATAGRAM_UNSENT;
12066         chk->snd_count = 0;
12067         if (stcb->asoc.alternate) {
12068                 chk->whoTo = stcb->asoc.alternate;
12069         } else {
12070                 chk->whoTo = stcb->asoc.primary_destination;
12071         }
12072         atomic_add_int(&chk->whoTo->ref_count, 1);
12073         ch = mtod(chk->data, struct sctp_chunkhdr *);
12074         ch->chunk_type = SCTP_STREAM_RESET;
12075         ch->chunk_flags = 0;
12076         ch->chunk_length = htons(chk->book_size);
12077         SCTP_BUF_LEN(chk->data) = chk->send_size;
12078
12079         seq = stcb->asoc.str_reset_seq_out;
12080         if (can_send_out_req) {
12081                 int ret;
12082
12083                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12084                 if (ret) {
12085                         seq++;
12086                         asoc->stream_reset_outstanding++;
12087                 }
12088         }
12089         if ((add_stream & 1) &&
12090             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12091                 /* Need to allocate more */
12092                 struct sctp_stream_out *oldstream;
12093                 struct sctp_stream_queue_pending *sp, *nsp;
12094                 int i;
12095 #if defined(SCTP_DETAILED_STR_STATS)
12096                 int j;
12097 #endif
12098
12099                 oldstream = stcb->asoc.strmout;
12100                 /* get some more */
12101                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12102                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12103                     SCTP_M_STRMO);
12104                 if (stcb->asoc.strmout == NULL) {
12105                         uint8_t x;
12106
12107                         stcb->asoc.strmout = oldstream;
12108                         /* Turn off the bit */
12109                         x = add_stream & 0xfe;
12110                         add_stream = x;
12111                         goto skip_stuff;
12112                 }
12113                 /*
12114                  * Ok now we proceed with copying the old out stuff and
12115                  * initializing the new stuff.
12116                  */
12117                 SCTP_TCB_SEND_LOCK(stcb);
12118                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12119                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12120                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12121                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12122                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12123                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12124                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12125                         stcb->asoc.strmout[i].stream_no = i;
12126                         stcb->asoc.strmout[i].state = oldstream[i].state;
12127                         /* FIX ME FIX ME */
12128                         /* This should be a SS_COPY operation FIX ME STREAM
12129                          * SCHEDULER EXPERT */
12130                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12131                         /* now anything on those queues? */
12132                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12133                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12134                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12135                         }
12136
12137                 }
12138                 /* now the new streams */
12139                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12140                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12141                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12142                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12143 #if defined(SCTP_DETAILED_STR_STATS)
12144                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12145                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12146                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12147                         }
12148 #else
12149                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12150                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12151 #endif
12152                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12153                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12154                         stcb->asoc.strmout[i].stream_no = i;
12155                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12156                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12157                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12158                 }
12159                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12160                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12161                 SCTP_TCB_SEND_UNLOCK(stcb);
12162         }
12163 skip_stuff:
12164         if ((add_stream & 1) && (adding_o > 0)) {
12165                 asoc->strm_pending_add_size = adding_o;
12166                 asoc->peer_req_out = peer_asked;
12167                 sctp_add_an_out_stream(chk, seq, adding_o);
12168                 seq++;
12169                 asoc->stream_reset_outstanding++;
12170         }
12171         if ((add_stream & 2) && (adding_i > 0)) {
12172                 sctp_add_an_in_stream(chk, seq, adding_i);
12173                 seq++;
12174                 asoc->stream_reset_outstanding++;
12175         }
12176         if (send_in_req) {
12177                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12178                 seq++;
12179                 asoc->stream_reset_outstanding++;
12180         }
12181         if (send_tsn_req) {
12182                 sctp_add_stream_reset_tsn(chk, seq);
12183                 asoc->stream_reset_outstanding++;
12184         }
12185         asoc->str_reset = chk;
12186         /* insert the chunk for sending */
12187         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12188             chk,
12189             sctp_next);
12190         asoc->ctrl_queue_cnt++;
12191         if (stcb->asoc.send_sack) {
12192                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12193         }
12194         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12195         return (0);
12196 }
12197
12198 void
12199 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12200     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12201     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12202     uint32_t vrf_id, uint16_t port)
12203 {
12204         /* Don't respond to an ABORT with an ABORT. */
12205         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12206                 if (cause)
12207                         sctp_m_freem(cause);
12208                 return;
12209         }
12210         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12211             mflowtype, mflowid, fibnum,
12212             vrf_id, port);
12213         return;
12214 }
12215
12216 void
12217 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12218     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12219     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12220     uint32_t vrf_id, uint16_t port)
12221 {
12222         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12223             mflowtype, mflowid, fibnum,
12224             vrf_id, port);
12225         return;
12226 }
12227
12228 static struct mbuf *
12229 sctp_copy_resume(struct uio *uio,
12230     int max_send_len,
12231     int user_marks_eor,
12232     int *error,
12233     uint32_t * sndout,
12234     struct mbuf **new_tail)
12235 {
12236         struct mbuf *m;
12237
12238         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12239             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12240         if (m == NULL) {
12241                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12242                 *error = ENOBUFS;
12243         } else {
12244                 *sndout = m_length(m, NULL);
12245                 *new_tail = m_last(m);
12246         }
12247         return (m);
12248 }
12249
12250 static int
12251 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12252     struct uio *uio,
12253     int resv_upfront)
12254 {
12255         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12256             resv_upfront, 0);
12257         if (sp->data == NULL) {
12258                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12259                 return (ENOBUFS);
12260         }
12261         sp->tail_mbuf = m_last(sp->data);
12262         return (0);
12263 }
12264
12265
12266
12267 static struct sctp_stream_queue_pending *
12268 sctp_copy_it_in(struct sctp_tcb *stcb,
12269     struct sctp_association *asoc,
12270     struct sctp_sndrcvinfo *srcv,
12271     struct uio *uio,
12272     struct sctp_nets *net,
12273     int max_send_len,
12274     int user_marks_eor,
12275     int *error)
12276 {
12277         /*-
12278          * This routine must be very careful in its work. Protocol
12279          * processing is up and running so care must be taken to spl...()
12280          * when you need to do something that may effect the stcb/asoc. The
12281          * sb is locked however. When data is copied the protocol processing
12282          * should be enabled since this is a slower operation...
12283          */
12284         struct sctp_stream_queue_pending *sp = NULL;
12285         int resv_in_first;
12286
12287         *error = 0;
12288         /* Now can we send this? */
12289         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12290             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12291             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12292             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12293                 /* got data while shutting down */
12294                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12295                 *error = ECONNRESET;
12296                 goto out_now;
12297         }
12298         sctp_alloc_a_strmoq(stcb, sp);
12299         if (sp == NULL) {
12300                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12301                 *error = ENOMEM;
12302                 goto out_now;
12303         }
12304         sp->act_flags = 0;
12305         sp->sender_all_done = 0;
12306         sp->sinfo_flags = srcv->sinfo_flags;
12307         sp->timetolive = srcv->sinfo_timetolive;
12308         sp->ppid = srcv->sinfo_ppid;
12309         sp->context = srcv->sinfo_context;
12310         sp->fsn = 0;
12311         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12312
12313         sp->stream = srcv->sinfo_stream;
12314         sp->length = (uint32_t) min(uio->uio_resid, max_send_len);
12315         if ((sp->length == (uint32_t) uio->uio_resid) &&
12316             ((user_marks_eor == 0) ||
12317             (srcv->sinfo_flags & SCTP_EOF) ||
12318             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12319                 sp->msg_is_complete = 1;
12320         } else {
12321                 sp->msg_is_complete = 0;
12322         }
12323         sp->sender_all_done = 0;
12324         sp->some_taken = 0;
12325         sp->put_last_out = 0;
12326         resv_in_first = sizeof(struct sctp_data_chunk);
12327         sp->data = sp->tail_mbuf = NULL;
12328         if (sp->length == 0) {
12329                 *error = 0;
12330                 goto skip_copy;
12331         }
12332         if (srcv->sinfo_keynumber_valid) {
12333                 sp->auth_keyid = srcv->sinfo_keynumber;
12334         } else {
12335                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12336         }
12337         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12338                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12339                 sp->holds_key_ref = 1;
12340         }
12341         *error = sctp_copy_one(sp, uio, resv_in_first);
12342 skip_copy:
12343         if (*error) {
12344                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12345                 sp = NULL;
12346         } else {
12347                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12348                         sp->net = net;
12349                         atomic_add_int(&sp->net->ref_count, 1);
12350                 } else {
12351                         sp->net = NULL;
12352                 }
12353                 sctp_set_prsctp_policy(sp);
12354         }
12355 out_now:
12356         return (sp);
12357 }
12358
12359
12360 int
12361 sctp_sosend(struct socket *so,
12362     struct sockaddr *addr,
12363     struct uio *uio,
12364     struct mbuf *top,
12365     struct mbuf *control,
12366     int flags,
12367     struct thread *p
12368 )
12369 {
12370         int error, use_sndinfo = 0;
12371         struct sctp_sndrcvinfo sndrcvninfo;
12372         struct sockaddr *addr_to_use;
12373 #if defined(INET) && defined(INET6)
12374         struct sockaddr_in sin;
12375 #endif
12376
12377         if (control) {
12378                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12379                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12380                     sizeof(sndrcvninfo))) {
12381                         /* got one */
12382                         use_sndinfo = 1;
12383                 }
12384         }
12385         addr_to_use = addr;
12386 #if defined(INET) && defined(INET6)
12387         if ((addr) && (addr->sa_family == AF_INET6)) {
12388                 struct sockaddr_in6 *sin6;
12389
12390                 sin6 = (struct sockaddr_in6 *)addr;
12391                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12392                         in6_sin6_2_sin(&sin, sin6);
12393                         addr_to_use = (struct sockaddr *)&sin;
12394                 }
12395         }
12396 #endif
12397         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12398             control,
12399             flags,
12400             use_sndinfo ? &sndrcvninfo : NULL
12401             ,p
12402             );
12403         return (error);
12404 }
12405
12406
12407 int
12408 sctp_lower_sosend(struct socket *so,
12409     struct sockaddr *addr,
12410     struct uio *uio,
12411     struct mbuf *i_pak,
12412     struct mbuf *control,
12413     int flags,
12414     struct sctp_sndrcvinfo *srcv
12415     ,
12416     struct thread *p
12417 )
12418 {
12419         unsigned int sndlen = 0, max_len;
12420         int error, len;
12421         struct mbuf *top = NULL;
12422         int queue_only = 0, queue_only_for_init = 0;
12423         int free_cnt_applied = 0;
12424         int un_sent;
12425         int now_filled = 0;
12426         unsigned int inqueue_bytes = 0;
12427         struct sctp_block_entry be;
12428         struct sctp_inpcb *inp;
12429         struct sctp_tcb *stcb = NULL;
12430         struct timeval now;
12431         struct sctp_nets *net;
12432         struct sctp_association *asoc;
12433         struct sctp_inpcb *t_inp;
12434         int user_marks_eor;
12435         int create_lock_applied = 0;
12436         int nagle_applies = 0;
12437         int some_on_control = 0;
12438         int got_all_of_the_send = 0;
12439         int hold_tcblock = 0;
12440         int non_blocking = 0;
12441         uint32_t local_add_more, local_soresv = 0;
12442         uint16_t port;
12443         uint16_t sinfo_flags;
12444         sctp_assoc_t sinfo_assoc_id;
12445
12446         error = 0;
12447         net = NULL;
12448         stcb = NULL;
12449         asoc = NULL;
12450
12451         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12452         if (inp == NULL) {
12453                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12454                 error = EINVAL;
12455                 if (i_pak) {
12456                         SCTP_RELEASE_PKT(i_pak);
12457                 }
12458                 return (error);
12459         }
12460         if ((uio == NULL) && (i_pak == NULL)) {
12461                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12462                 return (EINVAL);
12463         }
12464         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12465         atomic_add_int(&inp->total_sends, 1);
12466         if (uio) {
12467                 if (uio->uio_resid < 0) {
12468                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12469                         return (EINVAL);
12470                 }
12471                 sndlen = (unsigned int)uio->uio_resid;
12472         } else {
12473                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12474                 sndlen = SCTP_HEADER_LEN(i_pak);
12475         }
12476         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12477             (void *)addr,
12478             sndlen);
12479         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12480             (inp->sctp_socket->so_qlimit)) {
12481                 /* The listener can NOT send */
12482                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12483                 error = ENOTCONN;
12484                 goto out_unlocked;
12485         }
12486         /**
12487          * Pre-screen address, if one is given the sin-len
12488          * must be set correctly!
12489          */
12490         if (addr) {
12491                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12492
12493                 switch (raddr->sa.sa_family) {
12494 #ifdef INET
12495                 case AF_INET:
12496                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12497                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12498                                 error = EINVAL;
12499                                 goto out_unlocked;
12500                         }
12501                         port = raddr->sin.sin_port;
12502                         break;
12503 #endif
12504 #ifdef INET6
12505                 case AF_INET6:
12506                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12507                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12508                                 error = EINVAL;
12509                                 goto out_unlocked;
12510                         }
12511                         port = raddr->sin6.sin6_port;
12512                         break;
12513 #endif
12514                 default:
12515                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12516                         error = EAFNOSUPPORT;
12517                         goto out_unlocked;
12518                 }
12519         } else
12520                 port = 0;
12521
12522         if (srcv) {
12523                 sinfo_flags = srcv->sinfo_flags;
12524                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12525                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12526                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12527                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12528                         error = EINVAL;
12529                         goto out_unlocked;
12530                 }
12531                 if (srcv->sinfo_flags)
12532                         SCTP_STAT_INCR(sctps_sends_with_flags);
12533         } else {
12534                 sinfo_flags = inp->def_send.sinfo_flags;
12535                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12536         }
12537         if (sinfo_flags & SCTP_SENDALL) {
12538                 /* its a sendall */
12539                 error = sctp_sendall(inp, uio, top, srcv);
12540                 top = NULL;
12541                 goto out_unlocked;
12542         }
12543         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12544                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12545                 error = EINVAL;
12546                 goto out_unlocked;
12547         }
12548         /* now we must find the assoc */
12549         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12550             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12551                 SCTP_INP_RLOCK(inp);
12552                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12553                 if (stcb) {
12554                         SCTP_TCB_LOCK(stcb);
12555                         hold_tcblock = 1;
12556                 }
12557                 SCTP_INP_RUNLOCK(inp);
12558         } else if (sinfo_assoc_id) {
12559                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12560                 if (stcb != NULL) {
12561                         hold_tcblock = 1;
12562                 }
12563         } else if (addr) {
12564                 /*-
12565                  * Since we did not use findep we must
12566                  * increment it, and if we don't find a tcb
12567                  * decrement it.
12568                  */
12569                 SCTP_INP_WLOCK(inp);
12570                 SCTP_INP_INCR_REF(inp);
12571                 SCTP_INP_WUNLOCK(inp);
12572                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12573                 if (stcb == NULL) {
12574                         SCTP_INP_WLOCK(inp);
12575                         SCTP_INP_DECR_REF(inp);
12576                         SCTP_INP_WUNLOCK(inp);
12577                 } else {
12578                         hold_tcblock = 1;
12579                 }
12580         }
12581         if ((stcb == NULL) && (addr)) {
12582                 /* Possible implicit send? */
12583                 SCTP_ASOC_CREATE_LOCK(inp);
12584                 create_lock_applied = 1;
12585                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12586                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12587                         /* Should I really unlock ? */
12588                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12589                         error = EINVAL;
12590                         goto out_unlocked;
12591
12592                 }
12593                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12594                     (addr->sa_family == AF_INET6)) {
12595                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12596                         error = EINVAL;
12597                         goto out_unlocked;
12598                 }
12599                 SCTP_INP_WLOCK(inp);
12600                 SCTP_INP_INCR_REF(inp);
12601                 SCTP_INP_WUNLOCK(inp);
12602                 /* With the lock applied look again */
12603                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12604                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12605                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12606                 }
12607                 if (stcb == NULL) {
12608                         SCTP_INP_WLOCK(inp);
12609                         SCTP_INP_DECR_REF(inp);
12610                         SCTP_INP_WUNLOCK(inp);
12611                 } else {
12612                         hold_tcblock = 1;
12613                 }
12614                 if (error) {
12615                         goto out_unlocked;
12616                 }
12617                 if (t_inp != inp) {
12618                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12619                         error = ENOTCONN;
12620                         goto out_unlocked;
12621                 }
12622         }
12623         if (stcb == NULL) {
12624                 if (addr == NULL) {
12625                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12626                         error = ENOENT;
12627                         goto out_unlocked;
12628                 } else {
12629                         /* We must go ahead and start the INIT process */
12630                         uint32_t vrf_id;
12631
12632                         if ((sinfo_flags & SCTP_ABORT) ||
12633                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12634                                 /*-
12635                                  * User asks to abort a non-existant assoc,
12636                                  * or EOF a non-existant assoc with no data
12637                                  */
12638                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12639                                 error = ENOENT;
12640                                 goto out_unlocked;
12641                         }
12642                         /* get an asoc/stcb struct */
12643                         vrf_id = inp->def_vrf_id;
12644 #ifdef INVARIANTS
12645                         if (create_lock_applied == 0) {
12646                                 panic("Error, should hold create lock and I don't?");
12647                         }
12648 #endif
12649                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12650                             inp->sctp_ep.pre_open_stream_count,
12651                             inp->sctp_ep.port,
12652                             p);
12653                         if (stcb == NULL) {
12654                                 /* Error is setup for us in the call */
12655                                 goto out_unlocked;
12656                         }
12657                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12658                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12659                                 /* Set the connected flag so we can queue
12660                                  * data */
12661                                 soisconnecting(so);
12662                         }
12663                         hold_tcblock = 1;
12664                         if (create_lock_applied) {
12665                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12666                                 create_lock_applied = 0;
12667                         } else {
12668                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12669                         }
12670                         /* Turn on queue only flag to prevent data from
12671                          * being sent */
12672                         queue_only = 1;
12673                         asoc = &stcb->asoc;
12674                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12675                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12676
12677                         /* initialize authentication params for the assoc */
12678                         sctp_initialize_auth_params(inp, stcb);
12679
12680                         if (control) {
12681                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12682                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12683                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12684                                         hold_tcblock = 0;
12685                                         stcb = NULL;
12686                                         goto out_unlocked;
12687                                 }
12688                         }
12689                         /* out with the INIT */
12690                         queue_only_for_init = 1;
12691                         /*-
12692                          * we may want to dig in after this call and adjust the MTU
12693                          * value. It defaulted to 1500 (constant) but the ro
12694                          * structure may now have an update and thus we may need to
12695                          * change it BEFORE we append the message.
12696                          */
12697                 }
12698         } else
12699                 asoc = &stcb->asoc;
12700         if (srcv == NULL)
12701                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12702         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12703                 if (addr)
12704                         net = sctp_findnet(stcb, addr);
12705                 else
12706                         net = NULL;
12707                 if ((net == NULL) ||
12708                     ((port != 0) && (port != stcb->rport))) {
12709                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12710                         error = EINVAL;
12711                         goto out_unlocked;
12712                 }
12713         } else {
12714                 if (stcb->asoc.alternate) {
12715                         net = stcb->asoc.alternate;
12716                 } else {
12717                         net = stcb->asoc.primary_destination;
12718                 }
12719         }
12720         atomic_add_int(&stcb->total_sends, 1);
12721         /* Keep the stcb from being freed under our feet */
12722         atomic_add_int(&asoc->refcnt, 1);
12723         free_cnt_applied = 1;
12724
12725         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12726                 if (sndlen > asoc->smallest_mtu) {
12727                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12728                         error = EMSGSIZE;
12729                         goto out_unlocked;
12730                 }
12731         }
12732         if (SCTP_SO_IS_NBIO(so)
12733             || (flags & MSG_NBIO)
12734             ) {
12735                 non_blocking = 1;
12736         }
12737         /* would we block? */
12738         if (non_blocking) {
12739                 if (hold_tcblock == 0) {
12740                         SCTP_TCB_LOCK(stcb);
12741                         hold_tcblock = 1;
12742                 }
12743                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12744                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12745                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12746                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12747                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12748                                 error = EMSGSIZE;
12749                         else
12750                                 error = EWOULDBLOCK;
12751                         goto out_unlocked;
12752                 }
12753                 stcb->asoc.sb_send_resv += sndlen;
12754                 SCTP_TCB_UNLOCK(stcb);
12755                 hold_tcblock = 0;
12756         } else {
12757                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12758         }
12759         local_soresv = sndlen;
12760         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12761                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12762                 error = ECONNRESET;
12763                 goto out_unlocked;
12764         }
12765         if (create_lock_applied) {
12766                 SCTP_ASOC_CREATE_UNLOCK(inp);
12767                 create_lock_applied = 0;
12768         }
12769         /* Is the stream no. valid? */
12770         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12771                 /* Invalid stream number */
12772                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12773                 error = EINVAL;
12774                 goto out_unlocked;
12775         }
12776         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12777             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12778                 /*
12779                  * Can't queue any data while stream reset is underway.
12780                  */
12781                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12782                         error = EAGAIN;
12783                 } else {
12784                         error = EINVAL;
12785                 }
12786                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12787                 goto out_unlocked;
12788         }
12789         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12790             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12791                 queue_only = 1;
12792         }
12793         /* we are now done with all control */
12794         if (control) {
12795                 sctp_m_freem(control);
12796                 control = NULL;
12797         }
12798         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12799             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12800             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12801             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12802                 if (srcv->sinfo_flags & SCTP_ABORT) {
12803                         ;
12804                 } else {
12805                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12806                         error = ECONNRESET;
12807                         goto out_unlocked;
12808                 }
12809         }
12810         /* Ok, we will attempt a msgsnd :> */
12811         if (p) {
12812                 p->td_ru.ru_msgsnd++;
12813         }
12814         /* Are we aborting? */
12815         if (srcv->sinfo_flags & SCTP_ABORT) {
12816                 struct mbuf *mm;
12817                 int tot_demand, tot_out = 0, max_out;
12818
12819                 SCTP_STAT_INCR(sctps_sends_with_abort);
12820                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12821                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12822                         /* It has to be up before we abort */
12823                         /* how big is the user initiated abort? */
12824                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12825                         error = EINVAL;
12826                         goto out;
12827                 }
12828                 if (hold_tcblock) {
12829                         SCTP_TCB_UNLOCK(stcb);
12830                         hold_tcblock = 0;
12831                 }
12832                 if (top) {
12833                         struct mbuf *cntm = NULL;
12834
12835                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12836                         if (sndlen != 0) {
12837                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12838                                         tot_out += SCTP_BUF_LEN(cntm);
12839                                 }
12840                         }
12841                 } else {
12842                         /* Must fit in a MTU */
12843                         tot_out = sndlen;
12844                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12845                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12846                                 /* To big */
12847                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12848                                 error = EMSGSIZE;
12849                                 goto out;
12850                         }
12851                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12852                 }
12853                 if (mm == NULL) {
12854                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12855                         error = ENOMEM;
12856                         goto out;
12857                 }
12858                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12859                 max_out -= sizeof(struct sctp_abort_msg);
12860                 if (tot_out > max_out) {
12861                         tot_out = max_out;
12862                 }
12863                 if (mm) {
12864                         struct sctp_paramhdr *ph;
12865
12866                         /* now move forward the data pointer */
12867                         ph = mtod(mm, struct sctp_paramhdr *);
12868                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12869                         ph->param_length = htons((uint16_t) (sizeof(struct sctp_paramhdr) + tot_out));
12870                         ph++;
12871                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12872                         if (top == NULL) {
12873                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12874                                 if (error) {
12875                                         /*-
12876                                          * Here if we can't get his data we
12877                                          * still abort we just don't get to
12878                                          * send the users note :-0
12879                                          */
12880                                         sctp_m_freem(mm);
12881                                         mm = NULL;
12882                                 }
12883                         } else {
12884                                 if (sndlen != 0) {
12885                                         SCTP_BUF_NEXT(mm) = top;
12886                                 }
12887                         }
12888                 }
12889                 if (hold_tcblock == 0) {
12890                         SCTP_TCB_LOCK(stcb);
12891                 }
12892                 atomic_add_int(&stcb->asoc.refcnt, -1);
12893                 free_cnt_applied = 0;
12894                 /* release this lock, otherwise we hang on ourselves */
12895                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12896                 /* now relock the stcb so everything is sane */
12897                 hold_tcblock = 0;
12898                 stcb = NULL;
12899                 /*
12900                  * In this case top is already chained to mm avoid double
12901                  * free, since we free it below if top != NULL and driver
12902                  * would free it after sending the packet out
12903                  */
12904                 if (sndlen != 0) {
12905                         top = NULL;
12906                 }
12907                 goto out_unlocked;
12908         }
12909         /* Calculate the maximum we can send */
12910         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12911         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12912                 if (non_blocking) {
12913                         /* we already checked for non-blocking above. */
12914                         max_len = sndlen;
12915                 } else {
12916                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12917                 }
12918         } else {
12919                 max_len = 0;
12920         }
12921         if (hold_tcblock) {
12922                 SCTP_TCB_UNLOCK(stcb);
12923                 hold_tcblock = 0;
12924         }
12925         if (asoc->strmout == NULL) {
12926                 /* huh? software error */
12927                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12928                 error = EFAULT;
12929                 goto out_unlocked;
12930         }
12931         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12932         if ((user_marks_eor == 0) &&
12933             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12934                 /* It will NEVER fit */
12935                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12936                 error = EMSGSIZE;
12937                 goto out_unlocked;
12938         }
12939         if ((uio == NULL) && user_marks_eor) {
12940                 /*-
12941                  * We do not support eeor mode for
12942                  * sending with mbuf chains (like sendfile).
12943                  */
12944                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12945                 error = EINVAL;
12946                 goto out_unlocked;
12947         }
12948         if (user_marks_eor) {
12949                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12950         } else {
12951                 /*-
12952                  * For non-eeor the whole message must fit in
12953                  * the socket send buffer.
12954                  */
12955                 local_add_more = sndlen;
12956         }
12957         len = 0;
12958         if (non_blocking) {
12959                 goto skip_preblock;
12960         }
12961         if (((max_len <= local_add_more) &&
12962             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12963             (max_len == 0) ||
12964             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12965                 /* No room right now ! */
12966                 SOCKBUF_LOCK(&so->so_snd);
12967                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12968                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12969                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12970                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12971                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12972                             inqueue_bytes,
12973                             local_add_more,
12974                             stcb->asoc.stream_queue_cnt,
12975                             stcb->asoc.chunks_on_out_queue,
12976                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12977                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12978                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12979                         }
12980                         be.error = 0;
12981                         stcb->block_entry = &be;
12982                         error = sbwait(&so->so_snd);
12983                         stcb->block_entry = NULL;
12984                         if (error || so->so_error || be.error) {
12985                                 if (error == 0) {
12986                                         if (so->so_error)
12987                                                 error = so->so_error;
12988                                         if (be.error) {
12989                                                 error = be.error;
12990                                         }
12991                                 }
12992                                 SOCKBUF_UNLOCK(&so->so_snd);
12993                                 goto out_unlocked;
12994                         }
12995                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12996                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12997                                     asoc, stcb->asoc.total_output_queue_size);
12998                         }
12999                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13000                                 SOCKBUF_UNLOCK(&so->so_snd);
13001                                 goto out_unlocked;
13002                         }
13003                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13004                 }
13005                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13006                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13007                 } else {
13008                         max_len = 0;
13009                 }
13010                 SOCKBUF_UNLOCK(&so->so_snd);
13011         }
13012 skip_preblock:
13013         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13014                 goto out_unlocked;
13015         }
13016         /*
13017          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13018          * case NOTE: uio will be null when top/mbuf is passed
13019          */
13020         if (sndlen == 0) {
13021                 if (srcv->sinfo_flags & SCTP_EOF) {
13022                         got_all_of_the_send = 1;
13023                         goto dataless_eof;
13024                 } else {
13025                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13026                         error = EINVAL;
13027                         goto out;
13028                 }
13029         }
13030         if (top == NULL) {
13031                 struct sctp_stream_queue_pending *sp;
13032                 struct sctp_stream_out *strm;
13033                 uint32_t sndout;
13034
13035                 SCTP_TCB_SEND_LOCK(stcb);
13036                 if ((asoc->stream_locked) &&
13037                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13038                         SCTP_TCB_SEND_UNLOCK(stcb);
13039                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13040                         error = EINVAL;
13041                         goto out;
13042                 }
13043                 SCTP_TCB_SEND_UNLOCK(stcb);
13044
13045                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13046                 if (strm->last_msg_incomplete == 0) {
13047         do_a_copy_in:
13048                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13049                         if ((sp == NULL) || (error)) {
13050                                 goto out;
13051                         }
13052                         SCTP_TCB_SEND_LOCK(stcb);
13053                         if (sp->msg_is_complete) {
13054                                 strm->last_msg_incomplete = 0;
13055                                 asoc->stream_locked = 0;
13056                         } else {
13057                                 /*
13058                                  * Just got locked to this guy in case of an
13059                                  * interrupt.
13060                                  */
13061                                 strm->last_msg_incomplete = 1;
13062                                 if (stcb->asoc.idata_supported == 0) {
13063                                         asoc->stream_locked = 1;
13064                                         asoc->stream_locked_on = srcv->sinfo_stream;
13065                                 }
13066                                 sp->sender_all_done = 0;
13067                         }
13068                         sctp_snd_sb_alloc(stcb, sp->length);
13069                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13070                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13071                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13072                         }
13073                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13074                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13075                         SCTP_TCB_SEND_UNLOCK(stcb);
13076                 } else {
13077                         SCTP_TCB_SEND_LOCK(stcb);
13078                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13079                         SCTP_TCB_SEND_UNLOCK(stcb);
13080                         if (sp == NULL) {
13081                                 /* ???? Huh ??? last msg is gone */
13082 #ifdef INVARIANTS
13083                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13084 #else
13085                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13086                                 strm->last_msg_incomplete = 0;
13087 #endif
13088                                 goto do_a_copy_in;
13089
13090                         }
13091                 }
13092                 while (uio->uio_resid > 0) {
13093                         /* How much room do we have? */
13094                         struct mbuf *new_tail, *mm;
13095
13096                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13097                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13098                         else
13099                                 max_len = 0;
13100
13101                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13102                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13103                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13104                                 sndout = 0;
13105                                 new_tail = NULL;
13106                                 if (hold_tcblock) {
13107                                         SCTP_TCB_UNLOCK(stcb);
13108                                         hold_tcblock = 0;
13109                                 }
13110                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13111                                 if ((mm == NULL) || error) {
13112                                         if (mm) {
13113                                                 sctp_m_freem(mm);
13114                                         }
13115                                         goto out;
13116                                 }
13117                                 /* Update the mbuf and count */
13118                                 SCTP_TCB_SEND_LOCK(stcb);
13119                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13120                                         /*
13121                                          * we need to get out. Peer probably
13122                                          * aborted.
13123                                          */
13124                                         sctp_m_freem(mm);
13125                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13126                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13127                                                 error = ECONNRESET;
13128                                         }
13129                                         SCTP_TCB_SEND_UNLOCK(stcb);
13130                                         goto out;
13131                                 }
13132                                 if (sp->tail_mbuf) {
13133                                         /* tack it to the end */
13134                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13135                                         sp->tail_mbuf = new_tail;
13136                                 } else {
13137                                         /* A stolen mbuf */
13138                                         sp->data = mm;
13139                                         sp->tail_mbuf = new_tail;
13140                                 }
13141                                 sctp_snd_sb_alloc(stcb, sndout);
13142                                 atomic_add_int(&sp->length, sndout);
13143                                 len += sndout;
13144                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13145                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13146                                 }
13147                                 /* Did we reach EOR? */
13148                                 if ((uio->uio_resid == 0) &&
13149                                     ((user_marks_eor == 0) ||
13150                                     (srcv->sinfo_flags & SCTP_EOF) ||
13151                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13152                                         sp->msg_is_complete = 1;
13153                                 } else {
13154                                         sp->msg_is_complete = 0;
13155                                 }
13156                                 SCTP_TCB_SEND_UNLOCK(stcb);
13157                         }
13158                         if (uio->uio_resid == 0) {
13159                                 /* got it all? */
13160                                 continue;
13161                         }
13162                         /* PR-SCTP? */
13163                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13164                                 /* This is ugly but we must assure locking
13165                                  * order */
13166                                 if (hold_tcblock == 0) {
13167                                         SCTP_TCB_LOCK(stcb);
13168                                         hold_tcblock = 1;
13169                                 }
13170                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13171                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13172                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13173                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13174                                 else
13175                                         max_len = 0;
13176                                 if (max_len > 0) {
13177                                         continue;
13178                                 }
13179                                 SCTP_TCB_UNLOCK(stcb);
13180                                 hold_tcblock = 0;
13181                         }
13182                         /* wait for space now */
13183                         if (non_blocking) {
13184                                 /* Non-blocking io in place out */
13185                                 goto skip_out_eof;
13186                         }
13187                         /* What about the INIT, send it maybe */
13188                         if (queue_only_for_init) {
13189                                 if (hold_tcblock == 0) {
13190                                         SCTP_TCB_LOCK(stcb);
13191                                         hold_tcblock = 1;
13192                                 }
13193                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13194                                         /* a collision took us forward? */
13195                                         queue_only = 0;
13196                                 } else {
13197                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13198                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13199                                         queue_only = 1;
13200                                 }
13201                         }
13202                         if ((net->flight_size > net->cwnd) &&
13203                             (asoc->sctp_cmt_on_off == 0)) {
13204                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13205                                 queue_only = 1;
13206                         } else if (asoc->ifp_had_enobuf) {
13207                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13208                                 if (net->flight_size > (2 * net->mtu)) {
13209                                         queue_only = 1;
13210                                 }
13211                                 asoc->ifp_had_enobuf = 0;
13212                         }
13213                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13214                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13215                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13216                             (stcb->asoc.total_flight > 0) &&
13217                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13218                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13219
13220                                 /*-
13221                                  * Ok, Nagle is set on and we have data outstanding.
13222                                  * Don't send anything and let SACKs drive out the
13223                                  * data unless we have a "full" segment to send.
13224                                  */
13225                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13226                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13227                                 }
13228                                 SCTP_STAT_INCR(sctps_naglequeued);
13229                                 nagle_applies = 1;
13230                         } else {
13231                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13232                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13233                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13234                                 }
13235                                 SCTP_STAT_INCR(sctps_naglesent);
13236                                 nagle_applies = 0;
13237                         }
13238                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13239
13240                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13241                                     nagle_applies, un_sent);
13242                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13243                                     stcb->asoc.total_flight,
13244                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13245                         }
13246                         if (queue_only_for_init)
13247                                 queue_only_for_init = 0;
13248                         if ((queue_only == 0) && (nagle_applies == 0)) {
13249                                 /*-
13250                                  * need to start chunk output
13251                                  * before blocking.. note that if
13252                                  * a lock is already applied, then
13253                                  * the input via the net is happening
13254                                  * and I don't need to start output :-D
13255                                  */
13256                                 if (hold_tcblock == 0) {
13257                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13258                                                 hold_tcblock = 1;
13259                                                 sctp_chunk_output(inp,
13260                                                     stcb,
13261                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13262                                         }
13263                                 } else {
13264                                         sctp_chunk_output(inp,
13265                                             stcb,
13266                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13267                                 }
13268                                 if (hold_tcblock == 1) {
13269                                         SCTP_TCB_UNLOCK(stcb);
13270                                         hold_tcblock = 0;
13271                                 }
13272                         }
13273                         SOCKBUF_LOCK(&so->so_snd);
13274                         /*-
13275                          * This is a bit strange, but I think it will
13276                          * work. The total_output_queue_size is locked and
13277                          * protected by the TCB_LOCK, which we just released.
13278                          * There is a race that can occur between releasing it
13279                          * above, and me getting the socket lock, where sacks
13280                          * come in but we have not put the SB_WAIT on the
13281                          * so_snd buffer to get the wakeup. After the LOCK
13282                          * is applied the sack_processing will also need to
13283                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13284                          * once we have the socket buffer lock if we recheck the
13285                          * size we KNOW we will get to sleep safely with the
13286                          * wakeup flag in place.
13287                          */
13288                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13289                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13290                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13291                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13292                                             asoc, (size_t)uio->uio_resid);
13293                                 }
13294                                 be.error = 0;
13295                                 stcb->block_entry = &be;
13296                                 error = sbwait(&so->so_snd);
13297                                 stcb->block_entry = NULL;
13298
13299                                 if (error || so->so_error || be.error) {
13300                                         if (error == 0) {
13301                                                 if (so->so_error)
13302                                                         error = so->so_error;
13303                                                 if (be.error) {
13304                                                         error = be.error;
13305                                                 }
13306                                         }
13307                                         SOCKBUF_UNLOCK(&so->so_snd);
13308                                         goto out_unlocked;
13309                                 }
13310                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13311                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13312                                             asoc, stcb->asoc.total_output_queue_size);
13313                                 }
13314                         }
13315                         SOCKBUF_UNLOCK(&so->so_snd);
13316                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13317                                 goto out_unlocked;
13318                         }
13319                 }
13320                 SCTP_TCB_SEND_LOCK(stcb);
13321                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13322                         SCTP_TCB_SEND_UNLOCK(stcb);
13323                         goto out_unlocked;
13324                 }
13325                 if (sp) {
13326                         if (sp->msg_is_complete == 0) {
13327                                 strm->last_msg_incomplete = 1;
13328                                 if (stcb->asoc.idata_supported == 0) {
13329                                         asoc->stream_locked = 1;
13330                                         asoc->stream_locked_on = srcv->sinfo_stream;
13331                                 }
13332                         } else {
13333                                 sp->sender_all_done = 1;
13334                                 strm->last_msg_incomplete = 0;
13335                                 asoc->stream_locked = 0;
13336                         }
13337                 } else {
13338                         SCTP_PRINTF("Huh no sp TSNH?\n");
13339                         strm->last_msg_incomplete = 0;
13340                         asoc->stream_locked = 0;
13341                 }
13342                 SCTP_TCB_SEND_UNLOCK(stcb);
13343                 if (uio->uio_resid == 0) {
13344                         got_all_of_the_send = 1;
13345                 }
13346         } else {
13347                 /* We send in a 0, since we do NOT have any locks */
13348                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13349                 top = NULL;
13350                 if (srcv->sinfo_flags & SCTP_EOF) {
13351                         /*
13352                          * This should only happen for Panda for the mbuf
13353                          * send case, which does NOT yet support EEOR mode.
13354                          * Thus, we can just set this flag to do the proper
13355                          * EOF handling.
13356                          */
13357                         got_all_of_the_send = 1;
13358                 }
13359         }
13360         if (error) {
13361                 goto out;
13362         }
13363 dataless_eof:
13364         /* EOF thing ? */
13365         if ((srcv->sinfo_flags & SCTP_EOF) &&
13366             (got_all_of_the_send == 1)) {
13367                 SCTP_STAT_INCR(sctps_sends_with_eof);
13368                 error = 0;
13369                 if (hold_tcblock == 0) {
13370                         SCTP_TCB_LOCK(stcb);
13371                         hold_tcblock = 1;
13372                 }
13373                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13374                     TAILQ_EMPTY(&asoc->sent_queue) &&
13375                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13376                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13377                                 goto abort_anyway;
13378                         }
13379                         /* there is nothing queued to send, so I'm done... */
13380                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13381                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13382                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13383                                 struct sctp_nets *netp;
13384
13385                                 /* only send SHUTDOWN the first time through */
13386                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13387                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13388                                 }
13389                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13390                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13391                                 sctp_stop_timers_for_shutdown(stcb);
13392                                 if (stcb->asoc.alternate) {
13393                                         netp = stcb->asoc.alternate;
13394                                 } else {
13395                                         netp = stcb->asoc.primary_destination;
13396                                 }
13397                                 sctp_send_shutdown(stcb, netp);
13398                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13399                                     netp);
13400                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13401                                     asoc->primary_destination);
13402                         }
13403                 } else {
13404                         /*-
13405                          * we still got (or just got) data to send, so set
13406                          * SHUTDOWN_PENDING
13407                          */
13408                         /*-
13409                          * XXX sockets draft says that SCTP_EOF should be
13410                          * sent with no data.  currently, we will allow user
13411                          * data to be sent first and move to
13412                          * SHUTDOWN-PENDING
13413                          */
13414                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13415                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13416                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13417                                 if (hold_tcblock == 0) {
13418                                         SCTP_TCB_LOCK(stcb);
13419                                         hold_tcblock = 1;
13420                                 }
13421                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13422                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13423                                 }
13424                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13425                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13426                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13427                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13428                                         struct mbuf *op_err;
13429                                         char msg[SCTP_DIAG_INFO_LEN];
13430
13431                         abort_anyway:
13432                                         if (free_cnt_applied) {
13433                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13434                                                 free_cnt_applied = 0;
13435                                         }
13436                                         snprintf(msg, sizeof(msg),
13437                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13438                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13439                                             msg);
13440                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13441                                             op_err, SCTP_SO_LOCKED);
13442                                         /* now relock the stcb so everything
13443                                          * is sane */
13444                                         hold_tcblock = 0;
13445                                         stcb = NULL;
13446                                         goto out;
13447                                 }
13448                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13449                                     asoc->primary_destination);
13450                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13451                         }
13452                 }
13453         }
13454 skip_out_eof:
13455         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13456                 some_on_control = 1;
13457         }
13458         if (queue_only_for_init) {
13459                 if (hold_tcblock == 0) {
13460                         SCTP_TCB_LOCK(stcb);
13461                         hold_tcblock = 1;
13462                 }
13463                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13464                         /* a collision took us forward? */
13465                         queue_only = 0;
13466                 } else {
13467                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13468                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13469                         queue_only = 1;
13470                 }
13471         }
13472         if ((net->flight_size > net->cwnd) &&
13473             (stcb->asoc.sctp_cmt_on_off == 0)) {
13474                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13475                 queue_only = 1;
13476         } else if (asoc->ifp_had_enobuf) {
13477                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13478                 if (net->flight_size > (2 * net->mtu)) {
13479                         queue_only = 1;
13480                 }
13481                 asoc->ifp_had_enobuf = 0;
13482         }
13483         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13484             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13485         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13486             (stcb->asoc.total_flight > 0) &&
13487             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13488             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13489                 /*-
13490                  * Ok, Nagle is set on and we have data outstanding.
13491                  * Don't send anything and let SACKs drive out the
13492                  * data unless wen have a "full" segment to send.
13493                  */
13494                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13495                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13496                 }
13497                 SCTP_STAT_INCR(sctps_naglequeued);
13498                 nagle_applies = 1;
13499         } else {
13500                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13501                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13502                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13503                 }
13504                 SCTP_STAT_INCR(sctps_naglesent);
13505                 nagle_applies = 0;
13506         }
13507         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13508                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13509                     nagle_applies, un_sent);
13510                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13511                     stcb->asoc.total_flight,
13512                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13513         }
13514         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13515                 /* we can attempt to send too. */
13516                 if (hold_tcblock == 0) {
13517                         /* If there is activity recv'ing sacks no need to
13518                          * send */
13519                         if (SCTP_TCB_TRYLOCK(stcb)) {
13520                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13521                                 hold_tcblock = 1;
13522                         }
13523                 } else {
13524                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13525                 }
13526         } else if ((queue_only == 0) &&
13527                     (stcb->asoc.peers_rwnd == 0) &&
13528             (stcb->asoc.total_flight == 0)) {
13529                 /* We get to have a probe outstanding */
13530                 if (hold_tcblock == 0) {
13531                         hold_tcblock = 1;
13532                         SCTP_TCB_LOCK(stcb);
13533                 }
13534                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13535         } else if (some_on_control) {
13536                 int num_out, reason, frag_point;
13537
13538                 /* Here we do control only */
13539                 if (hold_tcblock == 0) {
13540                         hold_tcblock = 1;
13541                         SCTP_TCB_LOCK(stcb);
13542                 }
13543                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13544                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13545                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13546         }
13547         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13548             queue_only, stcb->asoc.peers_rwnd, un_sent,
13549             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13550             stcb->asoc.total_output_queue_size, error);
13551
13552 out:
13553 out_unlocked:
13554
13555         if (local_soresv && stcb) {
13556                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13557         }
13558         if (create_lock_applied) {
13559                 SCTP_ASOC_CREATE_UNLOCK(inp);
13560         }
13561         if ((stcb) && hold_tcblock) {
13562                 SCTP_TCB_UNLOCK(stcb);
13563         }
13564         if (stcb && free_cnt_applied) {
13565                 atomic_add_int(&stcb->asoc.refcnt, -1);
13566         }
13567 #ifdef INVARIANTS
13568         if (stcb) {
13569                 if (mtx_owned(&stcb->tcb_mtx)) {
13570                         panic("Leaving with tcb mtx owned?");
13571                 }
13572                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13573                         panic("Leaving with tcb send mtx owned?");
13574                 }
13575         }
13576 #endif
13577         if (top) {
13578                 sctp_m_freem(top);
13579         }
13580         if (control) {
13581                 sctp_m_freem(control);
13582         }
13583         return (error);
13584 }
13585
13586
13587 /*
13588  * generate an AUTHentication chunk, if required
13589  */
13590 struct mbuf *
13591 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13592     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13593     struct sctp_tcb *stcb, uint8_t chunk)
13594 {
13595         struct mbuf *m_auth;
13596         struct sctp_auth_chunk *auth;
13597         int chunk_len;
13598         struct mbuf *cn;
13599
13600         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13601             (stcb == NULL))
13602                 return (m);
13603
13604         if (stcb->asoc.auth_supported == 0) {
13605                 return (m);
13606         }
13607         /* does the requested chunk require auth? */
13608         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13609                 return (m);
13610         }
13611         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13612         if (m_auth == NULL) {
13613                 /* no mbuf's */
13614                 return (m);
13615         }
13616         /* reserve some space if this will be the first mbuf */
13617         if (m == NULL)
13618                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13619         /* fill in the AUTH chunk details */
13620         auth = mtod(m_auth, struct sctp_auth_chunk *);
13621         bzero(auth, sizeof(*auth));
13622         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13623         auth->ch.chunk_flags = 0;
13624         chunk_len = sizeof(*auth) +
13625             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13626         auth->ch.chunk_length = htons(chunk_len);
13627         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13628         /* key id and hmac digest will be computed and filled in upon send */
13629
13630         /* save the offset where the auth was inserted into the chain */
13631         *offset = 0;
13632         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13633                 *offset += SCTP_BUF_LEN(cn);
13634         }
13635
13636         /* update length and return pointer to the auth chunk */
13637         SCTP_BUF_LEN(m_auth) = chunk_len;
13638         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13639         if (auth_ret != NULL)
13640                 *auth_ret = auth;
13641
13642         return (m);
13643 }
13644
13645 #ifdef INET6
13646 int
13647 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13648 {
13649         struct nd_prefix *pfx = NULL;
13650         struct nd_pfxrouter *pfxrtr = NULL;
13651         struct sockaddr_in6 gw6;
13652
13653         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13654                 return (0);
13655
13656         /* get prefix entry of address */
13657         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13658                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13659                         continue;
13660                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13661                     &src6->sin6_addr, &pfx->ndpr_mask))
13662                         break;
13663         }
13664         /* no prefix entry in the prefix list */
13665         if (pfx == NULL) {
13666                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13667                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13668                 return (0);
13669         }
13670         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13671         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13672
13673         /* search installed gateway from prefix entry */
13674         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13675                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13676                 gw6.sin6_family = AF_INET6;
13677                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13678                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13679                     sizeof(struct in6_addr));
13680                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13681                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13682                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13683                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13684                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13685                         ND6_RUNLOCK();
13686                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13687                         return (1);
13688                 }
13689         }
13690         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13691         return (0);
13692 }
13693 #endif
13694
13695 int
13696 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13697 {
13698 #ifdef INET
13699         struct sockaddr_in *sin, *mask;
13700         struct ifaddr *ifa;
13701         struct in_addr srcnetaddr, gwnetaddr;
13702
13703         if (ro == NULL || ro->ro_rt == NULL ||
13704             sifa->address.sa.sa_family != AF_INET) {
13705                 return (0);
13706         }
13707         ifa = (struct ifaddr *)sifa->ifa;
13708         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13709         sin = &sifa->address.sin;
13710         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13711         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13712         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13713         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13714
13715         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13716         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13717         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13718         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13719         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13720         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13721                 return (1);
13722         }
13723 #endif
13724         return (0);
13725 }