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 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
1947 #endif
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963 #if defined(INET) || defined(INET6)
1964         if (M_TRAILINGSPACE(m) >= plen) {
1965                 /* easy side we just drop it on the end */
1966                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1967                 mret = m;
1968         } else {
1969                 /* Need more space */
1970                 mret = m;
1971                 while (SCTP_BUF_NEXT(mret) != NULL) {
1972                         mret = SCTP_BUF_NEXT(mret);
1973                 }
1974                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1975                 if (SCTP_BUF_NEXT(mret) == NULL) {
1976                         /* We are hosed, can't add more addresses */
1977                         return (m);
1978                 }
1979                 mret = SCTP_BUF_NEXT(mret);
1980                 parmh = mtod(mret, struct sctp_paramhdr *);
1981         }
1982         /* now add the parameter */
1983         switch (ifa->address.sa.sa_family) {
1984 #ifdef INET
1985         case AF_INET:
1986                 {
1987                         struct sctp_ipv4addr_param *ipv4p;
1988                         struct sockaddr_in *sin;
1989
1990                         sin = &ifa->address.sin;
1991                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1992                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1993                         parmh->param_length = htons(plen);
1994                         ipv4p->addr = sin->sin_addr.s_addr;
1995                         SCTP_BUF_LEN(mret) += plen;
1996                         break;
1997                 }
1998 #endif
1999 #ifdef INET6
2000         case AF_INET6:
2001                 {
2002                         struct sctp_ipv6addr_param *ipv6p;
2003                         struct sockaddr_in6 *sin6;
2004
2005                         sin6 = &ifa->address.sin6;
2006                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2007                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2008                         parmh->param_length = htons(plen);
2009                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2010                             sizeof(ipv6p->addr));
2011                         /* clear embedded scope in the address */
2012                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2013                         SCTP_BUF_LEN(mret) += plen;
2014                         break;
2015                 }
2016 #endif
2017         default:
2018                 return (m);
2019         }
2020         if (len != NULL) {
2021                 *len += plen;
2022         }
2023         return (mret);
2024 #endif
2025 }
2026
2027
2028 struct mbuf *
2029 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2030     struct sctp_scoping *scope,
2031     struct mbuf *m_at, int cnt_inits_to,
2032     uint16_t * padding_len, uint16_t * chunk_len)
2033 {
2034         struct sctp_vrf *vrf = NULL;
2035         int cnt, limit_out = 0, total_count;
2036         uint32_t vrf_id;
2037
2038         vrf_id = inp->def_vrf_id;
2039         SCTP_IPI_ADDR_RLOCK();
2040         vrf = sctp_find_vrf(vrf_id);
2041         if (vrf == NULL) {
2042                 SCTP_IPI_ADDR_RUNLOCK();
2043                 return (m_at);
2044         }
2045         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2046                 struct sctp_ifa *sctp_ifap;
2047                 struct sctp_ifn *sctp_ifnp;
2048
2049                 cnt = cnt_inits_to;
2050                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2051                         limit_out = 1;
2052                         cnt = SCTP_ADDRESS_LIMIT;
2053                         goto skip_count;
2054                 }
2055                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2056                         if ((scope->loopback_scope == 0) &&
2057                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2058                                 /*
2059                                  * Skip loopback devices if loopback_scope
2060                                  * not set
2061                                  */
2062                                 continue;
2063                         }
2064                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2065 #ifdef INET
2066                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2067                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2068                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2069                                         continue;
2070                                 }
2071 #endif
2072 #ifdef INET6
2073                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2074                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2075                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2076                                         continue;
2077                                 }
2078 #endif
2079                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2080                                         continue;
2081                                 }
2082                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2083                                         continue;
2084                                 }
2085                                 cnt++;
2086                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2087                                         break;
2088                                 }
2089                         }
2090                         if (cnt > SCTP_ADDRESS_LIMIT) {
2091                                 break;
2092                         }
2093                 }
2094 skip_count:
2095                 if (cnt > 1) {
2096                         total_count = 0;
2097                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2098                                 cnt = 0;
2099                                 if ((scope->loopback_scope == 0) &&
2100                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2101                                         /*
2102                                          * Skip loopback devices if
2103                                          * loopback_scope not set
2104                                          */
2105                                         continue;
2106                                 }
2107                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2108 #ifdef INET
2109                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2110                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2111                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2112                                                 continue;
2113                                         }
2114 #endif
2115 #ifdef INET6
2116                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2117                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2118                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2119                                                 continue;
2120                                         }
2121 #endif
2122                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2123                                                 continue;
2124                                         }
2125                                         if (sctp_is_address_in_scope(sctp_ifap,
2126                                             scope, 0) == 0) {
2127                                                 continue;
2128                                         }
2129                                         if ((chunk_len != NULL) &&
2130                                             (padding_len != NULL) &&
2131                                             (*padding_len > 0)) {
2132                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2133                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2134                                                 *chunk_len += *padding_len;
2135                                                 *padding_len = 0;
2136                                         }
2137                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2138                                         if (limit_out) {
2139                                                 cnt++;
2140                                                 total_count++;
2141                                                 if (cnt >= 2) {
2142                                                         /*
2143                                                          * two from each
2144                                                          * address
2145                                                          */
2146                                                         break;
2147                                                 }
2148                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2149                                                         /* No more addresses */
2150                                                         break;
2151                                                 }
2152                                         }
2153                                 }
2154                         }
2155                 }
2156         } else {
2157                 struct sctp_laddr *laddr;
2158
2159                 cnt = cnt_inits_to;
2160                 /* First, how many ? */
2161                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2162                         if (laddr->ifa == NULL) {
2163                                 continue;
2164                         }
2165                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2166                                 /*
2167                                  * Address being deleted by the system, dont
2168                                  * list.
2169                                  */
2170                                 continue;
2171                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2172                                 /*
2173                                  * Address being deleted on this ep don't
2174                                  * list.
2175                                  */
2176                                 continue;
2177                         }
2178                         if (sctp_is_address_in_scope(laddr->ifa,
2179                             scope, 1) == 0) {
2180                                 continue;
2181                         }
2182                         cnt++;
2183                 }
2184                 /*
2185                  * To get through a NAT we only list addresses if we have
2186                  * more than one. That way if you just bind a single address
2187                  * we let the source of the init dictate our address.
2188                  */
2189                 if (cnt > 1) {
2190                         cnt = cnt_inits_to;
2191                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2192                                 if (laddr->ifa == NULL) {
2193                                         continue;
2194                                 }
2195                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2196                                         continue;
2197                                 }
2198                                 if (sctp_is_address_in_scope(laddr->ifa,
2199                                     scope, 0) == 0) {
2200                                         continue;
2201                                 }
2202                                 if ((chunk_len != NULL) &&
2203                                     (padding_len != NULL) &&
2204                                     (*padding_len > 0)) {
2205                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2206                                         SCTP_BUF_LEN(m_at) += *padding_len;
2207                                         *chunk_len += *padding_len;
2208                                         *padding_len = 0;
2209                                 }
2210                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2211                                 cnt++;
2212                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2213                                         break;
2214                                 }
2215                         }
2216                 }
2217         }
2218         SCTP_IPI_ADDR_RUNLOCK();
2219         return (m_at);
2220 }
2221
2222 static struct sctp_ifa *
2223 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2224     uint8_t dest_is_loop,
2225     uint8_t dest_is_priv,
2226     sa_family_t fam)
2227 {
2228         uint8_t dest_is_global = 0;
2229
2230         /* dest_is_priv is true if destination is a private address */
2231         /* dest_is_loop is true if destination is a loopback addresses */
2232
2233         /**
2234          * Here we determine if its a preferred address. A preferred address
2235          * means it is the same scope or higher scope then the destination.
2236          * L = loopback, P = private, G = global
2237          * -----------------------------------------
2238          *    src    |  dest | result
2239          *  ----------------------------------------
2240          *     L     |    L  |    yes
2241          *  -----------------------------------------
2242          *     P     |    L  |    yes-v4 no-v6
2243          *  -----------------------------------------
2244          *     G     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     L     |    P  |    no
2247          *  -----------------------------------------
2248          *     P     |    P  |    yes
2249          *  -----------------------------------------
2250          *     G     |    P  |    no
2251          *   -----------------------------------------
2252          *     L     |    G  |    no
2253          *   -----------------------------------------
2254          *     P     |    G  |    no
2255          *    -----------------------------------------
2256          *     G     |    G  |    yes
2257          *    -----------------------------------------
2258          */
2259
2260         if (ifa->address.sa.sa_family != fam) {
2261                 /* forget mis-matched family */
2262                 return (NULL);
2263         }
2264         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2265                 dest_is_global = 1;
2266         }
2267         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2268         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2269         /* Ok the address may be ok */
2270 #ifdef INET6
2271         if (fam == AF_INET6) {
2272                 /* ok to use deprecated addresses? no lets not! */
2273                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2274                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2275                         return (NULL);
2276                 }
2277                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2278                         if (dest_is_loop) {
2279                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2280                                 return (NULL);
2281                         }
2282                 }
2283                 if (ifa->src_is_glob) {
2284                         if (dest_is_loop) {
2285                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2286                                 return (NULL);
2287                         }
2288                 }
2289         }
2290 #endif
2291         /*
2292          * Now that we know what is what, implement or table this could in
2293          * theory be done slicker (it used to be), but this is
2294          * straightforward and easier to validate :-)
2295          */
2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2297             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2299             dest_is_loop, dest_is_priv, dest_is_global);
2300
2301         if ((ifa->src_is_loop) && (dest_is_priv)) {
2302                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2303                 return (NULL);
2304         }
2305         if ((ifa->src_is_glob) && (dest_is_priv)) {
2306                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2307                 return (NULL);
2308         }
2309         if ((ifa->src_is_loop) && (dest_is_global)) {
2310                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2311                 return (NULL);
2312         }
2313         if ((ifa->src_is_priv) && (dest_is_global)) {
2314                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2315                 return (NULL);
2316         }
2317         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2318         /* its a preferred address */
2319         return (ifa);
2320 }
2321
2322 static struct sctp_ifa *
2323 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2324     uint8_t dest_is_loop,
2325     uint8_t dest_is_priv,
2326     sa_family_t fam)
2327 {
2328         uint8_t dest_is_global = 0;
2329
2330         /**
2331          * Here we determine if its a acceptable address. A acceptable
2332          * address means it is the same scope or higher scope but we can
2333          * allow for NAT which means its ok to have a global dest and a
2334          * private src.
2335          *
2336          * L = loopback, P = private, G = global
2337          * -----------------------------------------
2338          *  src    |  dest | result
2339          * -----------------------------------------
2340          *   L     |   L   |    yes
2341          *  -----------------------------------------
2342          *   P     |   L   |    yes-v4 no-v6
2343          *  -----------------------------------------
2344          *   G     |   L   |    yes
2345          * -----------------------------------------
2346          *   L     |   P   |    no
2347          * -----------------------------------------
2348          *   P     |   P   |    yes
2349          * -----------------------------------------
2350          *   G     |   P   |    yes - May not work
2351          * -----------------------------------------
2352          *   L     |   G   |    no
2353          * -----------------------------------------
2354          *   P     |   G   |    yes - May not work
2355          * -----------------------------------------
2356          *   G     |   G   |    yes
2357          * -----------------------------------------
2358          */
2359
2360         if (ifa->address.sa.sa_family != fam) {
2361                 /* forget non matching family */
2362                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2363                     ifa->address.sa.sa_family, fam);
2364                 return (NULL);
2365         }
2366         /* Ok the address may be ok */
2367         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2369             dest_is_loop, dest_is_priv);
2370         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2371                 dest_is_global = 1;
2372         }
2373 #ifdef INET6
2374         if (fam == AF_INET6) {
2375                 /* ok to use deprecated addresses? */
2376                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2377                         return (NULL);
2378                 }
2379                 if (ifa->src_is_priv) {
2380                         /* Special case, linklocal to loop */
2381                         if (dest_is_loop)
2382                                 return (NULL);
2383                 }
2384         }
2385 #endif
2386         /*
2387          * Now that we know what is what, implement our table. This could in
2388          * theory be done slicker (it used to be), but this is
2389          * straightforward and easier to validate :-)
2390          */
2391         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2392             ifa->src_is_loop,
2393             dest_is_priv);
2394         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2395                 return (NULL);
2396         }
2397         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2398             ifa->src_is_loop,
2399             dest_is_global);
2400         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2401                 return (NULL);
2402         }
2403         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2404         /* its an acceptable address */
2405         return (ifa);
2406 }
2407
2408 int
2409 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2410 {
2411         struct sctp_laddr *laddr;
2412
2413         if (stcb == NULL) {
2414                 /* There are no restrictions, no TCB :-) */
2415                 return (0);
2416         }
2417         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2418                 if (laddr->ifa == NULL) {
2419                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2420                             __func__);
2421                         continue;
2422                 }
2423                 if (laddr->ifa == ifa) {
2424                         /* Yes it is on the list */
2425                         return (1);
2426                 }
2427         }
2428         return (0);
2429 }
2430
2431
2432 int
2433 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2434 {
2435         struct sctp_laddr *laddr;
2436
2437         if (ifa == NULL)
2438                 return (0);
2439         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2440                 if (laddr->ifa == NULL) {
2441                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2442                             __func__);
2443                         continue;
2444                 }
2445                 if ((laddr->ifa == ifa) && laddr->action == 0)
2446                         /* same pointer */
2447                         return (1);
2448         }
2449         return (0);
2450 }
2451
2452
2453
2454 static struct sctp_ifa *
2455 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2456     sctp_route_t * ro,
2457     uint32_t vrf_id,
2458     int non_asoc_addr_ok,
2459     uint8_t dest_is_priv,
2460     uint8_t dest_is_loop,
2461     sa_family_t fam)
2462 {
2463         struct sctp_laddr *laddr, *starting_point;
2464         void *ifn;
2465         int resettotop = 0;
2466         struct sctp_ifn *sctp_ifn;
2467         struct sctp_ifa *sctp_ifa, *sifa;
2468         struct sctp_vrf *vrf;
2469         uint32_t ifn_index;
2470
2471         vrf = sctp_find_vrf(vrf_id);
2472         if (vrf == NULL)
2473                 return (NULL);
2474
2475         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2476         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2477         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2478         /*
2479          * first question, is the ifn we will emit on in our list, if so, we
2480          * want such an address. Note that we first looked for a preferred
2481          * address.
2482          */
2483         if (sctp_ifn) {
2484                 /* is a preferred one on the interface we route out? */
2485                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2486 #ifdef INET
2487                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2488                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2489                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2490                                 continue;
2491                         }
2492 #endif
2493 #ifdef INET6
2494                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2495                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2496                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2497                                 continue;
2498                         }
2499 #endif
2500                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2501                             (non_asoc_addr_ok == 0))
2502                                 continue;
2503                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2504                             dest_is_loop,
2505                             dest_is_priv, fam);
2506                         if (sifa == NULL)
2507                                 continue;
2508                         if (sctp_is_addr_in_ep(inp, sifa)) {
2509                                 atomic_add_int(&sifa->refcount, 1);
2510                                 return (sifa);
2511                         }
2512                 }
2513         }
2514         /*
2515          * ok, now we now need to find one on the list of the addresses. We
2516          * can't get one on the emitting interface so let's find first a
2517          * preferred one. If not that an acceptable one otherwise... we
2518          * return NULL.
2519          */
2520         starting_point = inp->next_addr_touse;
2521 once_again:
2522         if (inp->next_addr_touse == NULL) {
2523                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2524                 resettotop = 1;
2525         }
2526         for (laddr = inp->next_addr_touse; laddr;
2527             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2528                 if (laddr->ifa == NULL) {
2529                         /* address has been removed */
2530                         continue;
2531                 }
2532                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2533                         /* address is being deleted */
2534                         continue;
2535                 }
2536                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2537                     dest_is_priv, fam);
2538                 if (sifa == NULL)
2539                         continue;
2540                 atomic_add_int(&sifa->refcount, 1);
2541                 return (sifa);
2542         }
2543         if (resettotop == 0) {
2544                 inp->next_addr_touse = NULL;
2545                 goto once_again;
2546         }
2547         inp->next_addr_touse = starting_point;
2548         resettotop = 0;
2549 once_again_too:
2550         if (inp->next_addr_touse == NULL) {
2551                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552                 resettotop = 1;
2553         }
2554         /* ok, what about an acceptable address in the inp */
2555         for (laddr = inp->next_addr_touse; laddr;
2556             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2557                 if (laddr->ifa == NULL) {
2558                         /* address has been removed */
2559                         continue;
2560                 }
2561                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2562                         /* address is being deleted */
2563                         continue;
2564                 }
2565                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2566                     dest_is_priv, fam);
2567                 if (sifa == NULL)
2568                         continue;
2569                 atomic_add_int(&sifa->refcount, 1);
2570                 return (sifa);
2571         }
2572         if (resettotop == 0) {
2573                 inp->next_addr_touse = NULL;
2574                 goto once_again_too;
2575         }
2576         /*
2577          * no address bound can be a source for the destination we are in
2578          * trouble
2579          */
2580         return (NULL);
2581 }
2582
2583
2584
2585 static struct sctp_ifa *
2586 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2587     struct sctp_tcb *stcb,
2588     sctp_route_t * ro,
2589     uint32_t vrf_id,
2590     uint8_t dest_is_priv,
2591     uint8_t dest_is_loop,
2592     int non_asoc_addr_ok,
2593     sa_family_t fam)
2594 {
2595         struct sctp_laddr *laddr, *starting_point;
2596         void *ifn;
2597         struct sctp_ifn *sctp_ifn;
2598         struct sctp_ifa *sctp_ifa, *sifa;
2599         uint8_t start_at_beginning = 0;
2600         struct sctp_vrf *vrf;
2601         uint32_t ifn_index;
2602
2603         /*
2604          * first question, is the ifn we will emit on in our list, if so, we
2605          * want that one.
2606          */
2607         vrf = sctp_find_vrf(vrf_id);
2608         if (vrf == NULL)
2609                 return (NULL);
2610
2611         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2612         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2613         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2614
2615         /*
2616          * first question, is the ifn we will emit on in our list?  If so,
2617          * we want that one. First we look for a preferred. Second, we go
2618          * for an acceptable.
2619          */
2620         if (sctp_ifn) {
2621                 /* first try for a preferred address on the ep */
2622                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2623 #ifdef INET
2624                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2625                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2626                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2627                                 continue;
2628                         }
2629 #endif
2630 #ifdef INET6
2631                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2632                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2633                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2634                                 continue;
2635                         }
2636 #endif
2637                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2638                                 continue;
2639                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2640                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2641                                 if (sifa == NULL)
2642                                         continue;
2643                                 if (((non_asoc_addr_ok == 0) &&
2644                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2645                                     (non_asoc_addr_ok &&
2646                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2647                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2648                                         /* on the no-no list */
2649                                         continue;
2650                                 }
2651                                 atomic_add_int(&sifa->refcount, 1);
2652                                 return (sifa);
2653                         }
2654                 }
2655                 /* next try for an acceptable address on the ep */
2656                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2657 #ifdef INET
2658                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2659                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2660                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2661                                 continue;
2662                         }
2663 #endif
2664 #ifdef INET6
2665                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2666                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2667                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2668                                 continue;
2669                         }
2670 #endif
2671                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2672                                 continue;
2673                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2674                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2675                                 if (sifa == NULL)
2676                                         continue;
2677                                 if (((non_asoc_addr_ok == 0) &&
2678                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2679                                     (non_asoc_addr_ok &&
2680                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2681                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2682                                         /* on the no-no list */
2683                                         continue;
2684                                 }
2685                                 atomic_add_int(&sifa->refcount, 1);
2686                                 return (sifa);
2687                         }
2688                 }
2689
2690         }
2691         /*
2692          * if we can't find one like that then we must look at all addresses
2693          * bound to pick one at first preferable then secondly acceptable.
2694          */
2695         starting_point = stcb->asoc.last_used_address;
2696 sctp_from_the_top:
2697         if (stcb->asoc.last_used_address == NULL) {
2698                 start_at_beginning = 1;
2699                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2700         }
2701         /* search beginning with the last used address */
2702         for (laddr = stcb->asoc.last_used_address; laddr;
2703             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2704                 if (laddr->ifa == NULL) {
2705                         /* address has been removed */
2706                         continue;
2707                 }
2708                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2709                         /* address is being deleted */
2710                         continue;
2711                 }
2712                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2713                 if (sifa == NULL)
2714                         continue;
2715                 if (((non_asoc_addr_ok == 0) &&
2716                     (sctp_is_addr_restricted(stcb, sifa))) ||
2717                     (non_asoc_addr_ok &&
2718                     (sctp_is_addr_restricted(stcb, sifa)) &&
2719                     (!sctp_is_addr_pending(stcb, sifa)))) {
2720                         /* on the no-no list */
2721                         continue;
2722                 }
2723                 stcb->asoc.last_used_address = laddr;
2724                 atomic_add_int(&sifa->refcount, 1);
2725                 return (sifa);
2726         }
2727         if (start_at_beginning == 0) {
2728                 stcb->asoc.last_used_address = NULL;
2729                 goto sctp_from_the_top;
2730         }
2731         /* now try for any higher scope than the destination */
2732         stcb->asoc.last_used_address = starting_point;
2733         start_at_beginning = 0;
2734 sctp_from_the_top2:
2735         if (stcb->asoc.last_used_address == NULL) {
2736                 start_at_beginning = 1;
2737                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2738         }
2739         /* search beginning with the last used address */
2740         for (laddr = stcb->asoc.last_used_address; laddr;
2741             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2742                 if (laddr->ifa == NULL) {
2743                         /* address has been removed */
2744                         continue;
2745                 }
2746                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2747                         /* address is being deleted */
2748                         continue;
2749                 }
2750                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2751                     dest_is_priv, fam);
2752                 if (sifa == NULL)
2753                         continue;
2754                 if (((non_asoc_addr_ok == 0) &&
2755                     (sctp_is_addr_restricted(stcb, sifa))) ||
2756                     (non_asoc_addr_ok &&
2757                     (sctp_is_addr_restricted(stcb, sifa)) &&
2758                     (!sctp_is_addr_pending(stcb, sifa)))) {
2759                         /* on the no-no list */
2760                         continue;
2761                 }
2762                 stcb->asoc.last_used_address = laddr;
2763                 atomic_add_int(&sifa->refcount, 1);
2764                 return (sifa);
2765         }
2766         if (start_at_beginning == 0) {
2767                 stcb->asoc.last_used_address = NULL;
2768                 goto sctp_from_the_top2;
2769         }
2770         return (NULL);
2771 }
2772
2773 static struct sctp_ifa *
2774 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2775     struct sctp_inpcb *inp,
2776     struct sctp_tcb *stcb,
2777     int non_asoc_addr_ok,
2778     uint8_t dest_is_loop,
2779     uint8_t dest_is_priv,
2780     int addr_wanted,
2781     sa_family_t fam,
2782     sctp_route_t * ro
2783 )
2784 {
2785         struct sctp_ifa *ifa, *sifa;
2786         int num_eligible_addr = 0;
2787
2788 #ifdef INET6
2789         struct sockaddr_in6 sin6, lsa6;
2790
2791         if (fam == AF_INET6) {
2792                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2793                 (void)sa6_recoverscope(&sin6);
2794         }
2795 #endif                          /* INET6 */
2796         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2797 #ifdef INET
2798                 if ((ifa->address.sa.sa_family == AF_INET) &&
2799                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2800                     &ifa->address.sin.sin_addr) != 0)) {
2801                         continue;
2802                 }
2803 #endif
2804 #ifdef INET6
2805                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2806                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2807                     &ifa->address.sin6.sin6_addr) != 0)) {
2808                         continue;
2809                 }
2810 #endif
2811                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2812                     (non_asoc_addr_ok == 0))
2813                         continue;
2814                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2815                     dest_is_priv, fam);
2816                 if (sifa == NULL)
2817                         continue;
2818 #ifdef INET6
2819                 if (fam == AF_INET6 &&
2820                     dest_is_loop &&
2821                     sifa->src_is_loop && sifa->src_is_priv) {
2822                         /*
2823                          * don't allow fe80::1 to be a src on loop ::1, we
2824                          * don't list it to the peer so we will get an
2825                          * abort.
2826                          */
2827                         continue;
2828                 }
2829                 if (fam == AF_INET6 &&
2830                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2831                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2832                         /*
2833                          * link-local <-> link-local must belong to the same
2834                          * scope.
2835                          */
2836                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2837                         (void)sa6_recoverscope(&lsa6);
2838                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2839                                 continue;
2840                         }
2841                 }
2842 #endif                          /* INET6 */
2843
2844                 /*
2845                  * Check if the IPv6 address matches to next-hop. In the
2846                  * mobile case, old IPv6 address may be not deleted from the
2847                  * interface. Then, the interface has previous and new
2848                  * addresses.  We should use one corresponding to the
2849                  * next-hop.  (by micchie)
2850                  */
2851 #ifdef INET6
2852                 if (stcb && fam == AF_INET6 &&
2853                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2854                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2855                             == 0) {
2856                                 continue;
2857                         }
2858                 }
2859 #endif
2860 #ifdef INET
2861                 /* Avoid topologically incorrect IPv4 address */
2862                 if (stcb && fam == AF_INET &&
2863                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2864                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2865                                 continue;
2866                         }
2867                 }
2868 #endif
2869                 if (stcb) {
2870                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2871                                 continue;
2872                         }
2873                         if (((non_asoc_addr_ok == 0) &&
2874                             (sctp_is_addr_restricted(stcb, sifa))) ||
2875                             (non_asoc_addr_ok &&
2876                             (sctp_is_addr_restricted(stcb, sifa)) &&
2877                             (!sctp_is_addr_pending(stcb, sifa)))) {
2878                                 /*
2879                                  * It is restricted for some reason..
2880                                  * probably not yet added.
2881                                  */
2882                                 continue;
2883                         }
2884                 }
2885                 if (num_eligible_addr >= addr_wanted) {
2886                         return (sifa);
2887                 }
2888                 num_eligible_addr++;
2889         }
2890         return (NULL);
2891 }
2892
2893
2894 static int
2895 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2896     struct sctp_inpcb *inp,
2897     struct sctp_tcb *stcb,
2898     int non_asoc_addr_ok,
2899     uint8_t dest_is_loop,
2900     uint8_t dest_is_priv,
2901     sa_family_t fam)
2902 {
2903         struct sctp_ifa *ifa, *sifa;
2904         int num_eligible_addr = 0;
2905
2906         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2907 #ifdef INET
2908                 if ((ifa->address.sa.sa_family == AF_INET) &&
2909                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2910                     &ifa->address.sin.sin_addr) != 0)) {
2911                         continue;
2912                 }
2913 #endif
2914 #ifdef INET6
2915                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2916                     (stcb != NULL) &&
2917                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2918                     &ifa->address.sin6.sin6_addr) != 0)) {
2919                         continue;
2920                 }
2921 #endif
2922                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2923                     (non_asoc_addr_ok == 0)) {
2924                         continue;
2925                 }
2926                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2927                     dest_is_priv, fam);
2928                 if (sifa == NULL) {
2929                         continue;
2930                 }
2931                 if (stcb) {
2932                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2933                                 continue;
2934                         }
2935                         if (((non_asoc_addr_ok == 0) &&
2936                             (sctp_is_addr_restricted(stcb, sifa))) ||
2937                             (non_asoc_addr_ok &&
2938                             (sctp_is_addr_restricted(stcb, sifa)) &&
2939                             (!sctp_is_addr_pending(stcb, sifa)))) {
2940                                 /*
2941                                  * It is restricted for some reason..
2942                                  * probably not yet added.
2943                                  */
2944                                 continue;
2945                         }
2946                 }
2947                 num_eligible_addr++;
2948         }
2949         return (num_eligible_addr);
2950 }
2951
2952 static struct sctp_ifa *
2953 sctp_choose_boundall(struct sctp_inpcb *inp,
2954     struct sctp_tcb *stcb,
2955     struct sctp_nets *net,
2956     sctp_route_t * ro,
2957     uint32_t vrf_id,
2958     uint8_t dest_is_priv,
2959     uint8_t dest_is_loop,
2960     int non_asoc_addr_ok,
2961     sa_family_t fam)
2962 {
2963         int cur_addr_num = 0, num_preferred = 0;
2964         void *ifn;
2965         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2966         struct sctp_ifa *sctp_ifa, *sifa;
2967         uint32_t ifn_index;
2968         struct sctp_vrf *vrf;
2969
2970 #ifdef INET
2971         int retried = 0;
2972
2973 #endif
2974
2975         /*-
2976          * For boundall we can use any address in the association.
2977          * If non_asoc_addr_ok is set we can use any address (at least in
2978          * theory). So we look for preferred addresses first. If we find one,
2979          * we use it. Otherwise we next try to get an address on the
2980          * interface, which we should be able to do (unless non_asoc_addr_ok
2981          * is false and we are routed out that way). In these cases where we
2982          * can't use the address of the interface we go through all the
2983          * ifn's looking for an address we can use and fill that in. Punting
2984          * means we send back address 0, which will probably cause problems
2985          * actually since then IP will fill in the address of the route ifn,
2986          * which means we probably already rejected it.. i.e. here comes an
2987          * abort :-<.
2988          */
2989         vrf = sctp_find_vrf(vrf_id);
2990         if (vrf == NULL)
2991                 return (NULL);
2992
2993         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2994         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2995         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2996         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2997         if (sctp_ifn == NULL) {
2998                 /* ?? We don't have this guy ?? */
2999                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3000                 goto bound_all_plan_b;
3001         }
3002         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3003             ifn_index, sctp_ifn->ifn_name);
3004
3005         if (net) {
3006                 cur_addr_num = net->indx_of_eligible_next_to_use;
3007         }
3008         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3009             inp, stcb,
3010             non_asoc_addr_ok,
3011             dest_is_loop,
3012             dest_is_priv, fam);
3013         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3014             num_preferred, sctp_ifn->ifn_name);
3015         if (num_preferred == 0) {
3016                 /*
3017                  * no eligible addresses, we must use some other interface
3018                  * address if we can find one.
3019                  */
3020                 goto bound_all_plan_b;
3021         }
3022         /*
3023          * Ok we have num_eligible_addr set with how many we can use, this
3024          * may vary from call to call due to addresses being deprecated
3025          * etc..
3026          */
3027         if (cur_addr_num >= num_preferred) {
3028                 cur_addr_num = 0;
3029         }
3030         /*
3031          * select the nth address from the list (where cur_addr_num is the
3032          * nth) and 0 is the first one, 1 is the second one etc...
3033          */
3034         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3035
3036         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3037             dest_is_priv, cur_addr_num, fam, ro);
3038
3039         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3040         if (sctp_ifa) {
3041                 atomic_add_int(&sctp_ifa->refcount, 1);
3042                 if (net) {
3043                         /* save off where the next one we will want */
3044                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3045                 }
3046                 return (sctp_ifa);
3047         }
3048         /*
3049          * plan_b: Look at all interfaces and find a preferred address. If
3050          * no preferred fall through to plan_c.
3051          */
3052 bound_all_plan_b:
3053         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3054         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3055                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3056                     sctp_ifn->ifn_name);
3057                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3058                         /* wrong base scope */
3059                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3060                         continue;
3061                 }
3062                 if ((sctp_ifn == looked_at) && looked_at) {
3063                         /* already looked at this guy */
3064                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3065                         continue;
3066                 }
3067                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3068                     dest_is_loop, dest_is_priv, fam);
3069                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3070                     "Found ifn:%p %d preferred source addresses\n",
3071                     ifn, num_preferred);
3072                 if (num_preferred == 0) {
3073                         /* None on this interface. */
3074                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
3075                         continue;
3076                 }
3077                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3078                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3079                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3080
3081                 /*
3082                  * Ok we have num_eligible_addr set with how many we can
3083                  * use, this may vary from call to call due to addresses
3084                  * being deprecated etc..
3085                  */
3086                 if (cur_addr_num >= num_preferred) {
3087                         cur_addr_num = 0;
3088                 }
3089                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3090                     dest_is_priv, cur_addr_num, fam, ro);
3091                 if (sifa == NULL)
3092                         continue;
3093                 if (net) {
3094                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3096                             cur_addr_num);
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3101                 }
3102                 atomic_add_int(&sifa->refcount, 1);
3103                 return (sifa);
3104         }
3105 #ifdef INET
3106 again_with_private_addresses_allowed:
3107 #endif
3108         /* plan_c: do we have an acceptable address on the emit interface */
3109         sifa = NULL;
3110         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3111         if (emit_ifn == NULL) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3113                 goto plan_d;
3114         }
3115         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3116                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3117 #ifdef INET
3118                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3119                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3120                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122                         continue;
3123                 }
3124 #endif
3125 #ifdef INET6
3126                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3127                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3128                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3129                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3130                         continue;
3131                 }
3132 #endif
3133                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3134                     (non_asoc_addr_ok == 0)) {
3135                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3136                         continue;
3137                 }
3138                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3139                     dest_is_priv, fam);
3140                 if (sifa == NULL) {
3141                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3142                         continue;
3143                 }
3144                 if (stcb) {
3145                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3146                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3147                                 sifa = NULL;
3148                                 continue;
3149                         }
3150                         if (((non_asoc_addr_ok == 0) &&
3151                             (sctp_is_addr_restricted(stcb, sifa))) ||
3152                             (non_asoc_addr_ok &&
3153                             (sctp_is_addr_restricted(stcb, sifa)) &&
3154                             (!sctp_is_addr_pending(stcb, sifa)))) {
3155                                 /*
3156                                  * It is restricted for some reason..
3157                                  * probably not yet added.
3158                                  */
3159                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3160                                 sifa = NULL;
3161                                 continue;
3162                         }
3163                 }
3164                 atomic_add_int(&sifa->refcount, 1);
3165                 goto out;
3166         }
3167 plan_d:
3168         /*
3169          * plan_d: We are in trouble. No preferred address on the emit
3170          * interface. And not even a preferred address on all interfaces. Go
3171          * out and see if we can find an acceptable address somewhere
3172          * amongst all interfaces.
3173          */
3174         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3175         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3176                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3177                         /* wrong base scope */
3178                         continue;
3179                 }
3180                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3181 #ifdef INET
3182                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3183                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3184                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3185                                 continue;
3186                         }
3187 #endif
3188 #ifdef INET6
3189                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3190                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3191                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3192                                 continue;
3193                         }
3194 #endif
3195                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3196                             (non_asoc_addr_ok == 0))
3197                                 continue;
3198                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3199                             dest_is_loop,
3200                             dest_is_priv, fam);
3201                         if (sifa == NULL)
3202                                 continue;
3203                         if (stcb) {
3204                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3205                                         sifa = NULL;
3206                                         continue;
3207                                 }
3208                                 if (((non_asoc_addr_ok == 0) &&
3209                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3210                                     (non_asoc_addr_ok &&
3211                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3212                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3213                                         /*
3214                                          * It is restricted for some
3215                                          * reason.. probably not yet added.
3216                                          */
3217                                         sifa = NULL;
3218                                         continue;
3219                                 }
3220                         }
3221                         goto out;
3222                 }
3223         }
3224 #ifdef INET
3225         if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3226                 stcb->asoc.scope.ipv4_local_scope = 1;
3227                 retried = 1;
3228                 goto again_with_private_addresses_allowed;
3229         } else if (retried == 1) {
3230                 stcb->asoc.scope.ipv4_local_scope = 0;
3231         }
3232 #endif
3233 out:
3234 #ifdef INET
3235         if (sifa) {
3236                 if (retried == 1) {
3237                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3238                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3239                                         /* wrong base scope */
3240                                         continue;
3241                                 }
3242                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3243                                         struct sctp_ifa *tmp_sifa;
3244
3245 #ifdef INET
3246                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3247                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3248                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3249                                                 continue;
3250                                         }
3251 #endif
3252 #ifdef INET6
3253                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3254                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3255                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3256                                                 continue;
3257                                         }
3258 #endif
3259                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3260                                             (non_asoc_addr_ok == 0))
3261                                                 continue;
3262                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3263                                             dest_is_loop,
3264                                             dest_is_priv, fam);
3265                                         if (tmp_sifa == NULL) {
3266                                                 continue;
3267                                         }
3268                                         if (tmp_sifa == sifa) {
3269                                                 continue;
3270                                         }
3271                                         if (stcb) {
3272                                                 if (sctp_is_address_in_scope(tmp_sifa,
3273                                                     &stcb->asoc.scope, 0) == 0) {
3274                                                         continue;
3275                                                 }
3276                                                 if (((non_asoc_addr_ok == 0) &&
3277                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3278                                                     (non_asoc_addr_ok &&
3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3280                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3281                                                         /*
3282                                                          * It is restricted
3283                                                          * for some reason..
3284                                                          * probably not yet
3285                                                          * added.
3286                                                          */
3287                                                         continue;
3288                                                 }
3289                                         }
3290                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3291                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3292                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3293                                         }
3294                                 }
3295                         }
3296                 }
3297                 atomic_add_int(&sifa->refcount, 1);
3298         }
3299 #endif
3300         return (sifa);
3301 }
3302
3303
3304
3305 /* tcb may be NULL */
3306 struct sctp_ifa *
3307 sctp_source_address_selection(struct sctp_inpcb *inp,
3308     struct sctp_tcb *stcb,
3309     sctp_route_t * ro,
3310     struct sctp_nets *net,
3311     int non_asoc_addr_ok, uint32_t vrf_id)
3312 {
3313         struct sctp_ifa *answer;
3314         uint8_t dest_is_priv, dest_is_loop;
3315         sa_family_t fam;
3316
3317 #ifdef INET
3318         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3319
3320 #endif
3321 #ifdef INET6
3322         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3323
3324 #endif
3325
3326         /**
3327          * Rules: - Find the route if needed, cache if I can. - Look at
3328          * interface address in route, Is it in the bound list. If so we
3329          * have the best source. - If not we must rotate amongst the
3330          * addresses.
3331          *
3332          * Cavets and issues
3333          *
3334          * Do we need to pay attention to scope. We can have a private address
3335          * or a global address we are sourcing or sending to. So if we draw
3336          * it out
3337          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3338          * For V4
3339          * ------------------------------------------
3340          *      source     *      dest  *  result
3341          * -----------------------------------------
3342          * <a>  Private    *    Global  *  NAT
3343          * -----------------------------------------
3344          * <b>  Private    *    Private *  No problem
3345          * -----------------------------------------
3346          * <c>  Global     *    Private *  Huh, How will this work?
3347          * -----------------------------------------
3348          * <d>  Global     *    Global  *  No Problem
3349          *------------------------------------------
3350          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3351          * For V6
3352          *------------------------------------------
3353          *      source     *      dest  *  result
3354          * -----------------------------------------
3355          * <a>  Linklocal  *    Global  *
3356          * -----------------------------------------
3357          * <b>  Linklocal  * Linklocal  *  No problem
3358          * -----------------------------------------
3359          * <c>  Global     * Linklocal  *  Huh, How will this work?
3360          * -----------------------------------------
3361          * <d>  Global     *    Global  *  No Problem
3362          *------------------------------------------
3363          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3364          *
3365          * And then we add to that what happens if there are multiple addresses
3366          * assigned to an interface. Remember the ifa on a ifn is a linked
3367          * list of addresses. So one interface can have more than one IP
3368          * address. What happens if we have both a private and a global
3369          * address? Do we then use context of destination to sort out which
3370          * one is best? And what about NAT's sending P->G may get you a NAT
3371          * translation, or should you select the G thats on the interface in
3372          * preference.
3373          *
3374          * Decisions:
3375          *
3376          * - count the number of addresses on the interface.
3377          * - if it is one, no problem except case <c>.
3378          *   For <a> we will assume a NAT out there.
3379          * - if there are more than one, then we need to worry about scope P
3380          *   or G. We should prefer G -> G and P -> P if possible.
3381          *   Then as a secondary fall back to mixed types G->P being a last
3382          *   ditch one.
3383          * - The above all works for bound all, but bound specific we need to
3384          *   use the same concept but instead only consider the bound
3385          *   addresses. If the bound set is NOT assigned to the interface then
3386          *   we must use rotation amongst the bound addresses..
3387          */
3388         if (ro->ro_rt == NULL) {
3389                 /*
3390                  * Need a route to cache.
3391                  */
3392                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3393         }
3394         if (ro->ro_rt == NULL) {
3395                 return (NULL);
3396         }
3397         fam = ro->ro_dst.sa_family;
3398         dest_is_priv = dest_is_loop = 0;
3399         /* Setup our scopes for the destination */
3400         switch (fam) {
3401 #ifdef INET
3402         case AF_INET:
3403                 /* Scope based on outbound address */
3404                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3405                         dest_is_loop = 1;
3406                         if (net != NULL) {
3407                                 /* mark it as local */
3408                                 net->addr_is_local = 1;
3409                         }
3410                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3411                         dest_is_priv = 1;
3412                 }
3413                 break;
3414 #endif
3415 #ifdef INET6
3416         case AF_INET6:
3417                 /* Scope based on outbound address */
3418                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3419                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3420                         /*
3421                          * If the address is a loopback address, which
3422                          * consists of "::1" OR "fe80::1%lo0", we are
3423                          * loopback scope. But we don't use dest_is_priv
3424                          * (link local addresses).
3425                          */
3426                         dest_is_loop = 1;
3427                         if (net != NULL) {
3428                                 /* mark it as local */
3429                                 net->addr_is_local = 1;
3430                         }
3431                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3432                         dest_is_priv = 1;
3433                 }
3434                 break;
3435 #endif
3436         }
3437         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3438         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3439         SCTP_IPI_ADDR_RLOCK();
3440         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3441                 /*
3442                  * Bound all case
3443                  */
3444                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3445                     dest_is_priv, dest_is_loop,
3446                     non_asoc_addr_ok, fam);
3447                 SCTP_IPI_ADDR_RUNLOCK();
3448                 return (answer);
3449         }
3450         /*
3451          * Subset bound case
3452          */
3453         if (stcb) {
3454                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3455                     vrf_id, dest_is_priv,
3456                     dest_is_loop,
3457                     non_asoc_addr_ok, fam);
3458         } else {
3459                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3460                     non_asoc_addr_ok,
3461                     dest_is_priv,
3462                     dest_is_loop, fam);
3463         }
3464         SCTP_IPI_ADDR_RUNLOCK();
3465         return (answer);
3466 }
3467
3468 static int
3469 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3470 {
3471         struct cmsghdr cmh;
3472         int tlen, at, found;
3473         struct sctp_sndinfo sndinfo;
3474         struct sctp_prinfo prinfo;
3475         struct sctp_authinfo authinfo;
3476
3477         tlen = SCTP_BUF_LEN(control);
3478         at = 0;
3479         found = 0;
3480         /*
3481          * Independent of how many mbufs, find the c_type inside the control
3482          * structure and copy out the data.
3483          */
3484         while (at < tlen) {
3485                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3486                         /* There is not enough room for one more. */
3487                         return (found);
3488                 }
3489                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3490                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3491                         /* We dont't have a complete CMSG header. */
3492                         return (found);
3493                 }
3494                 if (((int)cmh.cmsg_len + at) > tlen) {
3495                         /* We don't have the complete CMSG. */
3496                         return (found);
3497                 }
3498                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3499                     ((c_type == cmh.cmsg_type) ||
3500                     ((c_type == SCTP_SNDRCV) &&
3501                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3502                     (cmh.cmsg_type == SCTP_PRINFO) ||
3503                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3504                         if (c_type == cmh.cmsg_type) {
3505                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3506                                         return (found);
3507                                 }
3508                                 /* It is exactly what we want. Copy it out. */
3509                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3510                                 return (1);
3511                         } else {
3512                                 struct sctp_sndrcvinfo *sndrcvinfo;
3513
3514                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3515                                 if (found == 0) {
3516                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3517                                                 return (found);
3518                                         }
3519                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3520                                 }
3521                                 switch (cmh.cmsg_type) {
3522                                 case SCTP_SNDINFO:
3523                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3524                                                 return (found);
3525                                         }
3526                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3527                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3528                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3529                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3530                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3531                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3532                                         break;
3533                                 case SCTP_PRINFO:
3534                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3535                                                 return (found);
3536                                         }
3537                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3538                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3539                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3540                                         } else {
3541                                                 sndrcvinfo->sinfo_timetolive = 0;
3542                                         }
3543                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3544                                         break;
3545                                 case SCTP_AUTHINFO:
3546                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3547                                                 return (found);
3548                                         }
3549                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3550                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3551                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3552                                         break;
3553                                 default:
3554                                         return (found);
3555                                 }
3556                                 found = 1;
3557                         }
3558                 }
3559                 at += CMSG_ALIGN(cmh.cmsg_len);
3560         }
3561         return (found);
3562 }
3563
3564 static int
3565 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3566 {
3567         struct cmsghdr cmh;
3568         int tlen, at;
3569         struct sctp_initmsg initmsg;
3570
3571 #ifdef INET
3572         struct sockaddr_in sin;
3573
3574 #endif
3575 #ifdef INET6
3576         struct sockaddr_in6 sin6;
3577
3578 #endif
3579
3580         tlen = SCTP_BUF_LEN(control);
3581         at = 0;
3582         while (at < tlen) {
3583                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3584                         /* There is not enough room for one more. */
3585                         *error = EINVAL;
3586                         return (1);
3587                 }
3588                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3589                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3590                         /* We dont't have a complete CMSG header. */
3591                         *error = EINVAL;
3592                         return (1);
3593                 }
3594                 if (((int)cmh.cmsg_len + at) > tlen) {
3595                         /* We don't have the complete CMSG. */
3596                         *error = EINVAL;
3597                         return (1);
3598                 }
3599                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3600                         switch (cmh.cmsg_type) {
3601                         case SCTP_INIT:
3602                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3603                                         *error = EINVAL;
3604                                         return (1);
3605                                 }
3606                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3607                                 if (initmsg.sinit_max_attempts)
3608                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3609                                 if (initmsg.sinit_num_ostreams)
3610                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3611                                 if (initmsg.sinit_max_instreams)
3612                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3613                                 if (initmsg.sinit_max_init_timeo)
3614                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3615                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3616                                         struct sctp_stream_out *tmp_str;
3617                                         unsigned int i;
3618
3619 #if defined(SCTP_DETAILED_STR_STATS)
3620                                         int j;
3621
3622 #endif
3623
3624                                         /* Default is NOT correct */
3625                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3626                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3627                                         SCTP_TCB_UNLOCK(stcb);
3628                                         SCTP_MALLOC(tmp_str,
3629                                             struct sctp_stream_out *,
3630                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3631                                             SCTP_M_STRMO);
3632                                         SCTP_TCB_LOCK(stcb);
3633                                         if (tmp_str != NULL) {
3634                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3635                                                 stcb->asoc.strmout = tmp_str;
3636                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3637                                         } else {
3638                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3639                                         }
3640                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3641                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3642                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3643                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3644 #if defined(SCTP_DETAILED_STR_STATS)
3645                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3646                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3647                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3648                                                 }
3649 #else
3650                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3651                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3652 #endif
3653                                                 stcb->asoc.strmout[i].stream_no = i;
3654                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3655                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3656                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3657                                         }
3658                                 }
3659                                 break;
3660 #ifdef INET
3661                         case SCTP_DSTADDRV4:
3662                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3663                                         *error = EINVAL;
3664                                         return (1);
3665                                 }
3666                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3667                                 sin.sin_family = AF_INET;
3668                                 sin.sin_len = sizeof(struct sockaddr_in);
3669                                 sin.sin_port = stcb->rport;
3670                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3671                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3672                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3673                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3674                                         *error = EINVAL;
3675                                         return (1);
3676                                 }
3677                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3678                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3679                                         *error = ENOBUFS;
3680                                         return (1);
3681                                 }
3682                                 break;
3683 #endif
3684 #ifdef INET6
3685                         case SCTP_DSTADDRV6:
3686                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3687                                         *error = EINVAL;
3688                                         return (1);
3689                                 }
3690                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3691                                 sin6.sin6_family = AF_INET6;
3692                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3693                                 sin6.sin6_port = stcb->rport;
3694                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3695                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3696                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3697                                         *error = EINVAL;
3698                                         return (1);
3699                                 }
3700 #ifdef INET
3701                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3702                                         in6_sin6_2_sin(&sin, &sin6);
3703                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3704                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3705                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3706                                                 *error = EINVAL;
3707                                                 return (1);
3708                                         }
3709                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3710                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3711                                                 *error = ENOBUFS;
3712                                                 return (1);
3713                                         }
3714                                 } else
3715 #endif
3716                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3717                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3718                                         *error = ENOBUFS;
3719                                         return (1);
3720                                 }
3721                                 break;
3722 #endif
3723                         default:
3724                                 break;
3725                         }
3726                 }
3727                 at += CMSG_ALIGN(cmh.cmsg_len);
3728         }
3729         return (0);
3730 }
3731
3732 static struct sctp_tcb *
3733 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3734     uint16_t port,
3735     struct mbuf *control,
3736     struct sctp_nets **net_p,
3737     int *error)
3738 {
3739         struct cmsghdr cmh;
3740         int tlen, at;
3741         struct sctp_tcb *stcb;
3742         struct sockaddr *addr;
3743
3744 #ifdef INET
3745         struct sockaddr_in sin;
3746
3747 #endif
3748 #ifdef INET6
3749         struct sockaddr_in6 sin6;
3750
3751 #endif
3752
3753         tlen = SCTP_BUF_LEN(control);
3754         at = 0;
3755         while (at < tlen) {
3756                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3757                         /* There is not enough room for one more. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3762                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3763                         /* We dont't have a complete CMSG header. */
3764                         *error = EINVAL;
3765                         return (NULL);
3766                 }
3767                 if (((int)cmh.cmsg_len + at) > tlen) {
3768                         /* We don't have the complete CMSG. */
3769                         *error = EINVAL;
3770                         return (NULL);
3771                 }
3772                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3773                         switch (cmh.cmsg_type) {
3774 #ifdef INET
3775                         case SCTP_DSTADDRV4:
3776                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3777                                         *error = EINVAL;
3778                                         return (NULL);
3779                                 }
3780                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3781                                 sin.sin_family = AF_INET;
3782                                 sin.sin_len = sizeof(struct sockaddr_in);
3783                                 sin.sin_port = port;
3784                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3785                                 addr = (struct sockaddr *)&sin;
3786                                 break;
3787 #endif
3788 #ifdef INET6
3789                         case SCTP_DSTADDRV6:
3790                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3791                                         *error = EINVAL;
3792                                         return (NULL);
3793                                 }
3794                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3795                                 sin6.sin6_family = AF_INET6;
3796                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3797                                 sin6.sin6_port = port;
3798                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3799 #ifdef INET
3800                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3801                                         in6_sin6_2_sin(&sin, &sin6);
3802                                         addr = (struct sockaddr *)&sin;
3803                                 } else
3804 #endif
3805                                         addr = (struct sockaddr *)&sin6;
3806                                 break;
3807 #endif
3808                         default:
3809                                 addr = NULL;
3810                                 break;
3811                         }
3812                         if (addr) {
3813                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3814                                 if (stcb != NULL) {
3815                                         return (stcb);
3816                                 }
3817                         }
3818                 }
3819                 at += CMSG_ALIGN(cmh.cmsg_len);
3820         }
3821         return (NULL);
3822 }
3823
3824 static struct mbuf *
3825 sctp_add_cookie(struct mbuf *init, int init_offset,
3826     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3827 {
3828         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3829         struct sctp_state_cookie *stc;
3830         struct sctp_paramhdr *ph;
3831         uint8_t *foo;
3832         int sig_offset;
3833         uint16_t cookie_sz;
3834
3835         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3836             sizeof(struct sctp_paramhdr)), 0,
3837             M_NOWAIT, 1, MT_DATA);
3838         if (mret == NULL) {
3839                 return (NULL);
3840         }
3841         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3842         if (copy_init == NULL) {
3843                 sctp_m_freem(mret);
3844                 return (NULL);
3845         }
3846 #ifdef SCTP_MBUF_LOGGING
3847         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3848                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3849         }
3850 #endif
3851         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3852             M_NOWAIT);
3853         if (copy_initack == NULL) {
3854                 sctp_m_freem(mret);
3855                 sctp_m_freem(copy_init);
3856                 return (NULL);
3857         }
3858 #ifdef SCTP_MBUF_LOGGING
3859         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3860                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3861         }
3862 #endif
3863         /* easy side we just drop it on the end */
3864         ph = mtod(mret, struct sctp_paramhdr *);
3865         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3866             sizeof(struct sctp_paramhdr);
3867         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3868             sizeof(struct sctp_paramhdr));
3869         ph->param_type = htons(SCTP_STATE_COOKIE);
3870         ph->param_length = 0;   /* fill in at the end */
3871         /* Fill in the stc cookie data */
3872         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3873
3874         /* tack the INIT and then the INIT-ACK onto the chain */
3875         cookie_sz = 0;
3876         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3877                 cookie_sz += SCTP_BUF_LEN(m_at);
3878                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3879                         SCTP_BUF_NEXT(m_at) = copy_init;
3880                         break;
3881                 }
3882         }
3883         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3884                 cookie_sz += SCTP_BUF_LEN(m_at);
3885                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3886                         SCTP_BUF_NEXT(m_at) = copy_initack;
3887                         break;
3888                 }
3889         }
3890         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3891                 cookie_sz += SCTP_BUF_LEN(m_at);
3892                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3893                         break;
3894                 }
3895         }
3896         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3897         if (sig == NULL) {
3898                 /* no space, so free the entire chain */
3899                 sctp_m_freem(mret);
3900                 return (NULL);
3901         }
3902         SCTP_BUF_LEN(sig) = 0;
3903         SCTP_BUF_NEXT(m_at) = sig;
3904         sig_offset = 0;
3905         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3906         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3907         *signature = foo;
3908         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3909         cookie_sz += SCTP_SIGNATURE_SIZE;
3910         ph->param_length = htons(cookie_sz);
3911         return (mret);
3912 }
3913
3914
3915 static uint8_t
3916 sctp_get_ect(struct sctp_tcb *stcb)
3917 {
3918         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3919                 return (SCTP_ECT0_BIT);
3920         } else {
3921                 return (0);
3922         }
3923 }
3924
3925 #if defined(INET) || defined(INET6)
3926 static void
3927 sctp_handle_no_route(struct sctp_tcb *stcb,
3928     struct sctp_nets *net,
3929     int so_locked)
3930 {
3931         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3932
3933         if (net) {
3934                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3935                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3936                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3937                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3938                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3939                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3940                                     stcb, 0,
3941                                     (void *)net,
3942                                     so_locked);
3943                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3944                                 net->dest_state &= ~SCTP_ADDR_PF;
3945                         }
3946                 }
3947                 if (stcb) {
3948                         if (net == stcb->asoc.primary_destination) {
3949                                 /* need a new primary */
3950                                 struct sctp_nets *alt;
3951
3952                                 alt = sctp_find_alternate_net(stcb, net, 0);
3953                                 if (alt != net) {
3954                                         if (stcb->asoc.alternate) {
3955                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3956                                         }
3957                                         stcb->asoc.alternate = alt;
3958                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3959                                         if (net->ro._s_addr) {
3960                                                 sctp_free_ifa(net->ro._s_addr);
3961                                                 net->ro._s_addr = NULL;
3962                                         }
3963                                         net->src_addr_selected = 0;
3964                                 }
3965                         }
3966                 }
3967         }
3968 }
3969
3970 #endif
3971
3972 static int
3973 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3974     struct sctp_tcb *stcb,      /* may be NULL */
3975     struct sctp_nets *net,
3976     struct sockaddr *to,
3977     struct mbuf *m,
3978     uint32_t auth_offset,
3979     struct sctp_auth_chunk *auth,
3980     uint16_t auth_keyid,
3981     int nofragment_flag,
3982     int ecn_ok,
3983     int out_of_asoc_ok,
3984     uint16_t src_port,
3985     uint16_t dest_port,
3986     uint32_t v_tag,
3987     uint16_t port,
3988     union sctp_sockstore *over_addr,
3989     uint8_t mflowtype, uint32_t mflowid,
3990 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3991     int so_locked SCTP_UNUSED
3992 #else
3993     int so_locked
3994 #endif
3995 )
3996 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3997 {
3998         /**
3999          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4000          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4001          * - fill in the HMAC digest of any AUTH chunk in the packet.
4002          * - calculate and fill in the SCTP checksum.
4003          * - prepend an IP address header.
4004          * - if boundall use INADDR_ANY.
4005          * - if boundspecific do source address selection.
4006          * - set fragmentation option for ipV4.
4007          * - On return from IP output, check/adjust mtu size of output
4008          *   interface and smallest_mtu size as well.
4009          */
4010         /* Will need ifdefs around this */
4011         struct mbuf *newm;
4012         struct sctphdr *sctphdr;
4013         int packet_length;
4014         int ret;
4015
4016 #if defined(INET) || defined(INET6)
4017         uint32_t vrf_id;
4018
4019 #endif
4020 #if defined(INET) || defined(INET6)
4021         struct mbuf *o_pak;
4022         sctp_route_t *ro = NULL;
4023         struct udphdr *udp = NULL;
4024
4025 #endif
4026         uint8_t tos_value;
4027
4028 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4029         struct socket *so = NULL;
4030
4031 #endif
4032
4033         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4034                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4035                 sctp_m_freem(m);
4036                 return (EFAULT);
4037         }
4038 #if defined(INET) || defined(INET6)
4039         if (stcb) {
4040                 vrf_id = stcb->asoc.vrf_id;
4041         } else {
4042                 vrf_id = inp->def_vrf_id;
4043         }
4044 #endif
4045         /* fill in the HMAC digest for any AUTH chunk in the packet */
4046         if ((auth != NULL) && (stcb != NULL)) {
4047                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4048         }
4049         if (net) {
4050                 tos_value = net->dscp;
4051         } else if (stcb) {
4052                 tos_value = stcb->asoc.default_dscp;
4053         } else {
4054                 tos_value = inp->sctp_ep.default_dscp;
4055         }
4056
4057         switch (to->sa_family) {
4058 #ifdef INET
4059         case AF_INET:
4060                 {
4061                         struct ip *ip = NULL;
4062                         sctp_route_t iproute;
4063                         int len;
4064
4065                         len = SCTP_MIN_V4_OVERHEAD;
4066                         if (port) {
4067                                 len += sizeof(struct udphdr);
4068                         }
4069                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4070                         if (newm == NULL) {
4071                                 sctp_m_freem(m);
4072                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4073                                 return (ENOMEM);
4074                         }
4075                         SCTP_ALIGN_TO_END(newm, len);
4076                         SCTP_BUF_LEN(newm) = len;
4077                         SCTP_BUF_NEXT(newm) = m;
4078                         m = newm;
4079                         if (net != NULL) {
4080                                 m->m_pkthdr.flowid = net->flowid;
4081                                 M_HASHTYPE_SET(m, net->flowtype);
4082                         } else {
4083                                 m->m_pkthdr.flowid = mflowid;
4084                                 M_HASHTYPE_SET(m, mflowtype);
4085                         }
4086                         packet_length = sctp_calculate_len(m);
4087                         ip = mtod(m, struct ip *);
4088                         ip->ip_v = IPVERSION;
4089                         ip->ip_hl = (sizeof(struct ip) >> 2);
4090                         if (tos_value == 0) {
4091                                 /*
4092                                  * This means especially, that it is not set
4093                                  * at the SCTP layer. So use the value from
4094                                  * the IP layer.
4095                                  */
4096                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4097                         }
4098                         tos_value &= 0xfc;
4099                         if (ecn_ok) {
4100                                 tos_value |= sctp_get_ect(stcb);
4101                         }
4102                         if ((nofragment_flag) && (port == 0)) {
4103                                 ip->ip_off = htons(IP_DF);
4104                         } else {
4105                                 ip->ip_off = htons(0);
4106                         }
4107                         /* FreeBSD has a function for ip_id's */
4108                         ip_fillid(ip);
4109
4110                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4111                         ip->ip_len = htons(packet_length);
4112                         ip->ip_tos = tos_value;
4113                         if (port) {
4114                                 ip->ip_p = IPPROTO_UDP;
4115                         } else {
4116                                 ip->ip_p = IPPROTO_SCTP;
4117                         }
4118                         ip->ip_sum = 0;
4119                         if (net == NULL) {
4120                                 ro = &iproute;
4121                                 memset(&iproute, 0, sizeof(iproute));
4122                                 memcpy(&ro->ro_dst, to, to->sa_len);
4123                         } else {
4124                                 ro = (sctp_route_t *) & net->ro;
4125                         }
4126                         /* Now the address selection part */
4127                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4128
4129                         /* call the routine to select the src address */
4130                         if (net && out_of_asoc_ok == 0) {
4131                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4132                                         sctp_free_ifa(net->ro._s_addr);
4133                                         net->ro._s_addr = NULL;
4134                                         net->src_addr_selected = 0;
4135                                         if (ro->ro_rt) {
4136                                                 RTFREE(ro->ro_rt);
4137                                                 ro->ro_rt = NULL;
4138                                         }
4139                                 }
4140                                 if (net->src_addr_selected == 0) {
4141                                         /* Cache the source address */
4142                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4143                                             ro, net, 0,
4144                                             vrf_id);
4145                                         net->src_addr_selected = 1;
4146                                 }
4147                                 if (net->ro._s_addr == NULL) {
4148                                         /* No route to host */
4149                                         net->src_addr_selected = 0;
4150                                         sctp_handle_no_route(stcb, net, so_locked);
4151                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4152                                         sctp_m_freem(m);
4153                                         return (EHOSTUNREACH);
4154                                 }
4155                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4156                         } else {
4157                                 if (over_addr == NULL) {
4158                                         struct sctp_ifa *_lsrc;
4159
4160                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4161                                             net,
4162                                             out_of_asoc_ok,
4163                                             vrf_id);
4164                                         if (_lsrc == NULL) {
4165                                                 sctp_handle_no_route(stcb, net, so_locked);
4166                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4167                                                 sctp_m_freem(m);
4168                                                 return (EHOSTUNREACH);
4169                                         }
4170                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4171                                         sctp_free_ifa(_lsrc);
4172                                 } else {
4173                                         ip->ip_src = over_addr->sin.sin_addr;
4174                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4175                                 }
4176                         }
4177                         if (port) {
4178                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4179                                         sctp_handle_no_route(stcb, net, so_locked);
4180                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4181                                         sctp_m_freem(m);
4182                                         return (EHOSTUNREACH);
4183                                 }
4184                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4185                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4186                                 udp->uh_dport = port;
4187                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4188                                 if (V_udp_cksum) {
4189                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4190                                 } else {
4191                                         udp->uh_sum = 0;
4192                                 }
4193                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4194                         } else {
4195                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4196                         }
4197
4198                         sctphdr->src_port = src_port;
4199                         sctphdr->dest_port = dest_port;
4200                         sctphdr->v_tag = v_tag;
4201                         sctphdr->checksum = 0;
4202
4203                         /*
4204                          * If source address selection fails and we find no
4205                          * route then the ip_output should fail as well with
4206                          * a NO_ROUTE_TO_HOST type error. We probably should
4207                          * catch that somewhere and abort the association
4208                          * right away (assuming this is an INIT being sent).
4209                          */
4210                         if (ro->ro_rt == NULL) {
4211                                 /*
4212                                  * src addr selection failed to find a route
4213                                  * (or valid source addr), so we can't get
4214                                  * there from here (yet)!
4215                                  */
4216                                 sctp_handle_no_route(stcb, net, so_locked);
4217                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4218                                 sctp_m_freem(m);
4219                                 return (EHOSTUNREACH);
4220                         }
4221                         if (ro != &iproute) {
4222                                 memcpy(&iproute, ro, sizeof(*ro));
4223                         }
4224                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4225                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4226                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4227                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4228                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4229                             (void *)ro->ro_rt);
4230
4231                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4232                                 /* failed to prepend data, give up */
4233                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4234                                 sctp_m_freem(m);
4235                                 return (ENOMEM);
4236                         }
4237                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4238                         if (port) {
4239 #if defined(SCTP_WITH_NO_CSUM)
4240                                 SCTP_STAT_INCR(sctps_sendnocrc);
4241 #else
4242                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4243                                 SCTP_STAT_INCR(sctps_sendswcrc);
4244 #endif
4245                                 if (V_udp_cksum) {
4246                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4247                                 }
4248                         } else {
4249 #if defined(SCTP_WITH_NO_CSUM)
4250                                 SCTP_STAT_INCR(sctps_sendnocrc);
4251 #else
4252                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4253                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4254                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4255 #endif
4256                         }
4257 #ifdef SCTP_PACKET_LOGGING
4258                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4259                                 sctp_packet_log(o_pak);
4260 #endif
4261                         /* send it out.  table id is taken from stcb */
4262 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4263                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4264                                 so = SCTP_INP_SO(inp);
4265                                 SCTP_SOCKET_UNLOCK(so, 0);
4266                         }
4267 #endif
4268                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4269 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4270                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4271                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4272                                 SCTP_TCB_UNLOCK(stcb);
4273                                 SCTP_SOCKET_LOCK(so, 0);
4274                                 SCTP_TCB_LOCK(stcb);
4275                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4276                         }
4277 #endif
4278                         SCTP_STAT_INCR(sctps_sendpackets);
4279                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4280                         if (ret)
4281                                 SCTP_STAT_INCR(sctps_senderrors);
4282
4283                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4284                         if (net == NULL) {
4285                                 /* free tempy routes */
4286                                 RO_RTFREE(ro);
4287                         } else {
4288                                 /*
4289                                  * PMTU check versus smallest asoc MTU goes
4290                                  * here
4291                                  */
4292                                 if ((ro->ro_rt != NULL) &&
4293                                     (net->ro._s_addr)) {
4294                                         uint32_t mtu;
4295
4296                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4297                                         if (net->port) {
4298                                                 mtu -= sizeof(struct udphdr);
4299                                         }
4300                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4301                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4302                                                 net->mtu = mtu;
4303                                         }
4304                                 } else if (ro->ro_rt == NULL) {
4305                                         /* route was freed */
4306                                         if (net->ro._s_addr &&
4307                                             net->src_addr_selected) {
4308                                                 sctp_free_ifa(net->ro._s_addr);
4309                                                 net->ro._s_addr = NULL;
4310                                         }
4311                                         net->src_addr_selected = 0;
4312                                 }
4313                         }
4314                         return (ret);
4315                 }
4316 #endif
4317 #ifdef INET6
4318         case AF_INET6:
4319                 {
4320                         uint32_t flowlabel, flowinfo;
4321                         struct ip6_hdr *ip6h;
4322                         struct route_in6 ip6route;
4323                         struct ifnet *ifp;
4324                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4325                         int prev_scope = 0;
4326                         struct sockaddr_in6 lsa6_storage;
4327                         int error;
4328                         u_short prev_port = 0;
4329                         int len;
4330
4331                         if (net) {
4332                                 flowlabel = net->flowlabel;
4333                         } else if (stcb) {
4334                                 flowlabel = stcb->asoc.default_flowlabel;
4335                         } else {
4336                                 flowlabel = inp->sctp_ep.default_flowlabel;
4337                         }
4338                         if (flowlabel == 0) {
4339                                 /*
4340                                  * This means especially, that it is not set
4341                                  * at the SCTP layer. So use the value from
4342                                  * the IP layer.
4343                                  */
4344                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4345                         }
4346                         flowlabel &= 0x000fffff;
4347                         len = SCTP_MIN_OVERHEAD;
4348                         if (port) {
4349                                 len += sizeof(struct udphdr);
4350                         }
4351                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4352                         if (newm == NULL) {
4353                                 sctp_m_freem(m);
4354                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4355                                 return (ENOMEM);
4356                         }
4357                         SCTP_ALIGN_TO_END(newm, len);
4358                         SCTP_BUF_LEN(newm) = len;
4359                         SCTP_BUF_NEXT(newm) = m;
4360                         m = newm;
4361                         if (net != NULL) {
4362                                 m->m_pkthdr.flowid = net->flowid;
4363                                 M_HASHTYPE_SET(m, net->flowtype);
4364                         } else {
4365                                 m->m_pkthdr.flowid = mflowid;
4366                                 M_HASHTYPE_SET(m, mflowtype);
4367                         }
4368                         packet_length = sctp_calculate_len(m);
4369
4370                         ip6h = mtod(m, struct ip6_hdr *);
4371                         /* protect *sin6 from overwrite */
4372                         sin6 = (struct sockaddr_in6 *)to;
4373                         tmp = *sin6;
4374                         sin6 = &tmp;
4375
4376                         /* KAME hack: embed scopeid */
4377                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4378                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4379                                 return (EINVAL);
4380                         }
4381                         if (net == NULL) {
4382                                 memset(&ip6route, 0, sizeof(ip6route));
4383                                 ro = (sctp_route_t *) & ip6route;
4384                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4385                         } else {
4386                                 ro = (sctp_route_t *) & net->ro;
4387                         }
4388                         /*
4389                          * We assume here that inp_flow is in host byte
4390                          * order within the TCB!
4391                          */
4392                         if (tos_value == 0) {
4393                                 /*
4394                                  * This means especially, that it is not set
4395                                  * at the SCTP layer. So use the value from
4396                                  * the IP layer.
4397                                  */
4398                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4399                         }
4400                         tos_value &= 0xfc;
4401                         if (ecn_ok) {
4402                                 tos_value |= sctp_get_ect(stcb);
4403                         }
4404                         flowinfo = 0x06;
4405                         flowinfo <<= 8;
4406                         flowinfo |= tos_value;
4407                         flowinfo <<= 20;
4408                         flowinfo |= flowlabel;
4409                         ip6h->ip6_flow = htonl(flowinfo);
4410                         if (port) {
4411                                 ip6h->ip6_nxt = IPPROTO_UDP;
4412                         } else {
4413                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4414                         }
4415                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4416                         ip6h->ip6_dst = sin6->sin6_addr;
4417
4418                         /*
4419                          * Add SRC address selection here: we can only reuse
4420                          * to a limited degree the kame src-addr-sel, since
4421                          * we can try their selection but it may not be
4422                          * bound.
4423                          */
4424                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4425                         lsa6_tmp.sin6_family = AF_INET6;
4426                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4427                         lsa6 = &lsa6_tmp;
4428                         if (net && out_of_asoc_ok == 0) {
4429                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4430                                         sctp_free_ifa(net->ro._s_addr);
4431                                         net->ro._s_addr = NULL;
4432                                         net->src_addr_selected = 0;
4433                                         if (ro->ro_rt) {
4434                                                 RTFREE(ro->ro_rt);
4435                                                 ro->ro_rt = NULL;
4436                                         }
4437                                 }
4438                                 if (net->src_addr_selected == 0) {
4439                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4440                                         /* KAME hack: embed scopeid */
4441                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4442                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4443                                                 return (EINVAL);
4444                                         }
4445                                         /* Cache the source address */
4446                                         net->ro._s_addr = sctp_source_address_selection(inp,
4447                                             stcb,
4448                                             ro,
4449                                             net,
4450                                             0,
4451                                             vrf_id);
4452                                         (void)sa6_recoverscope(sin6);
4453                                         net->src_addr_selected = 1;
4454                                 }
4455                                 if (net->ro._s_addr == NULL) {
4456                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4457                                         net->src_addr_selected = 0;
4458                                         sctp_handle_no_route(stcb, net, so_locked);
4459                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4460                                         sctp_m_freem(m);
4461                                         return (EHOSTUNREACH);
4462                                 }
4463                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4464                         } else {
4465                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4466                                 /* KAME hack: embed scopeid */
4467                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4468                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4469                                         return (EINVAL);
4470                                 }
4471                                 if (over_addr == NULL) {
4472                                         struct sctp_ifa *_lsrc;
4473
4474                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4475                                             net,
4476                                             out_of_asoc_ok,
4477                                             vrf_id);
4478                                         if (_lsrc == NULL) {
4479                                                 sctp_handle_no_route(stcb, net, so_locked);
4480                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4481                                                 sctp_m_freem(m);
4482                                                 return (EHOSTUNREACH);
4483                                         }
4484                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4485                                         sctp_free_ifa(_lsrc);
4486                                 } else {
4487                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4488                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4489                                 }
4490                                 (void)sa6_recoverscope(sin6);
4491                         }
4492                         lsa6->sin6_port = inp->sctp_lport;
4493
4494                         if (ro->ro_rt == NULL) {
4495                                 /*
4496                                  * src addr selection failed to find a route
4497                                  * (or valid source addr), so we can't get
4498                                  * there from here!
4499                                  */
4500                                 sctp_handle_no_route(stcb, net, so_locked);
4501                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4502                                 sctp_m_freem(m);
4503                                 return (EHOSTUNREACH);
4504                         }
4505                         /*
4506                          * XXX: sa6 may not have a valid sin6_scope_id in
4507                          * the non-SCOPEDROUTING case.
4508                          */
4509                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4510                         lsa6_storage.sin6_family = AF_INET6;
4511                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4512                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4513                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4514                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4515                                 sctp_m_freem(m);
4516                                 return (error);
4517                         }
4518                         /* XXX */
4519                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4520                         lsa6_storage.sin6_port = inp->sctp_lport;
4521                         lsa6 = &lsa6_storage;
4522                         ip6h->ip6_src = lsa6->sin6_addr;
4523
4524                         if (port) {
4525                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4526                                         sctp_handle_no_route(stcb, net, so_locked);
4527                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4528                                         sctp_m_freem(m);
4529                                         return (EHOSTUNREACH);
4530                                 }
4531                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4532                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4533                                 udp->uh_dport = port;
4534                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4535                                 udp->uh_sum = 0;
4536                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4537                         } else {
4538                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4539                         }
4540
4541                         sctphdr->src_port = src_port;
4542                         sctphdr->dest_port = dest_port;
4543                         sctphdr->v_tag = v_tag;
4544                         sctphdr->checksum = 0;
4545
4546                         /*
4547                          * We set the hop limit now since there is a good
4548                          * chance that our ro pointer is now filled
4549                          */
4550                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4551                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4552
4553 #ifdef SCTP_DEBUG
4554                         /* Copy to be sure something bad is not happening */
4555                         sin6->sin6_addr = ip6h->ip6_dst;
4556                         lsa6->sin6_addr = ip6h->ip6_src;
4557 #endif
4558
4559                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4560                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4561                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4562                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4563                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4564                         if (net) {
4565                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4566                                 /*
4567                                  * preserve the port and scope for link
4568                                  * local send
4569                                  */
4570                                 prev_scope = sin6->sin6_scope_id;
4571                                 prev_port = sin6->sin6_port;
4572                         }
4573                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4574                                 /* failed to prepend data, give up */
4575                                 sctp_m_freem(m);
4576                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4577                                 return (ENOMEM);
4578                         }
4579                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4580                         if (port) {
4581 #if defined(SCTP_WITH_NO_CSUM)
4582                                 SCTP_STAT_INCR(sctps_sendnocrc);
4583 #else
4584                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4585                                 SCTP_STAT_INCR(sctps_sendswcrc);
4586 #endif
4587                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4588                                         udp->uh_sum = 0xffff;
4589                                 }
4590                         } else {
4591 #if defined(SCTP_WITH_NO_CSUM)
4592                                 SCTP_STAT_INCR(sctps_sendnocrc);
4593 #else
4594                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4595                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4596                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4597 #endif
4598                         }
4599                         /* send it out. table id is taken from stcb */
4600 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4601                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4602                                 so = SCTP_INP_SO(inp);
4603                                 SCTP_SOCKET_UNLOCK(so, 0);
4604                         }
4605 #endif
4606 #ifdef SCTP_PACKET_LOGGING
4607                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4608                                 sctp_packet_log(o_pak);
4609 #endif
4610                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4611 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4612                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4613                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4614                                 SCTP_TCB_UNLOCK(stcb);
4615                                 SCTP_SOCKET_LOCK(so, 0);
4616                                 SCTP_TCB_LOCK(stcb);
4617                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4618                         }
4619 #endif
4620                         if (net) {
4621                                 /* for link local this must be done */
4622                                 sin6->sin6_scope_id = prev_scope;
4623                                 sin6->sin6_port = prev_port;
4624                         }
4625                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4626                         SCTP_STAT_INCR(sctps_sendpackets);
4627                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4628                         if (ret) {
4629                                 SCTP_STAT_INCR(sctps_senderrors);
4630                         }
4631                         if (net == NULL) {
4632                                 /* Now if we had a temp route free it */
4633                                 RO_RTFREE(ro);
4634                         } else {
4635                                 /*
4636                                  * PMTU check versus smallest asoc MTU goes
4637                                  * here
4638                                  */
4639                                 if (ro->ro_rt == NULL) {
4640                                         /* Route was freed */
4641                                         if (net->ro._s_addr &&
4642                                             net->src_addr_selected) {
4643                                                 sctp_free_ifa(net->ro._s_addr);
4644                                                 net->ro._s_addr = NULL;
4645                                         }
4646                                         net->src_addr_selected = 0;
4647                                 }
4648                                 if ((ro->ro_rt != NULL) &&
4649                                     (net->ro._s_addr)) {
4650                                         uint32_t mtu;
4651
4652                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4653                                         if (mtu &&
4654                                             (stcb->asoc.smallest_mtu > mtu)) {
4655                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4656                                                 net->mtu = mtu;
4657                                                 if (net->port) {
4658                                                         net->mtu -= sizeof(struct udphdr);
4659                                                 }
4660                                         }
4661                                 } else if (ifp) {
4662                                         if (ND_IFINFO(ifp)->linkmtu &&
4663                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4664                                                 sctp_mtu_size_reset(inp,
4665                                                     &stcb->asoc,
4666                                                     ND_IFINFO(ifp)->linkmtu);
4667                                         }
4668                                 }
4669                         }
4670                         return (ret);
4671                 }
4672 #endif
4673         default:
4674                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4675                     ((struct sockaddr *)to)->sa_family);
4676                 sctp_m_freem(m);
4677                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4678                 return (EFAULT);
4679         }
4680 }
4681
4682
4683 void
4684 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4685 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4686     SCTP_UNUSED
4687 #endif
4688 )
4689 {
4690         struct mbuf *m, *m_last;
4691         struct sctp_nets *net;
4692         struct sctp_init_chunk *init;
4693         struct sctp_supported_addr_param *sup_addr;
4694         struct sctp_adaptation_layer_indication *ali;
4695         struct sctp_supported_chunk_types_param *pr_supported;
4696         struct sctp_paramhdr *ph;
4697         int cnt_inits_to = 0;
4698         int ret;
4699         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4700
4701         /* INIT's always go to the primary (and usually ONLY address) */
4702         net = stcb->asoc.primary_destination;
4703         if (net == NULL) {
4704                 net = TAILQ_FIRST(&stcb->asoc.nets);
4705                 if (net == NULL) {
4706                         /* TSNH */
4707                         return;
4708                 }
4709                 /* we confirm any address we send an INIT to */
4710                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4711                 (void)sctp_set_primary_addr(stcb, NULL, net);
4712         } else {
4713                 /* we confirm any address we send an INIT to */
4714                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4715         }
4716         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4717 #ifdef INET6
4718         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4719                 /*
4720                  * special hook, if we are sending to link local it will not
4721                  * show up in our private address count.
4722                  */
4723                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4724                         cnt_inits_to = 1;
4725         }
4726 #endif
4727         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4728                 /* This case should not happen */
4729                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4730                 return;
4731         }
4732         /* start the INIT timer */
4733         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4734
4735         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4736         if (m == NULL) {
4737                 /* No memory, INIT timer will re-attempt. */
4738                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4739                 return;
4740         }
4741         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4742         padding_len = 0;
4743         /* Now lets put the chunk header in place */
4744         init = mtod(m, struct sctp_init_chunk *);
4745         /* now the chunk header */
4746         init->ch.chunk_type = SCTP_INITIATION;
4747         init->ch.chunk_flags = 0;
4748         /* fill in later from mbuf we build */
4749         init->ch.chunk_length = 0;
4750         /* place in my tag */
4751         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4752         /* set up some of the credits. */
4753         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4754             SCTP_MINIMAL_RWND));
4755         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4756         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4757         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4758
4759         /* Adaptation layer indication parameter */
4760         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4761                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4762                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4763                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4764                 ali->ph.param_length = htons(parameter_len);
4765                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4766                 chunk_len += parameter_len;
4767         }
4768         /* ECN parameter */
4769         if (stcb->asoc.ecn_supported == 1) {
4770                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4771                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4772                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4773                 ph->param_length = htons(parameter_len);
4774                 chunk_len += parameter_len;
4775         }
4776         /* PR-SCTP supported parameter */
4777         if (stcb->asoc.prsctp_supported == 1) {
4778                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4779                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4780                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4781                 ph->param_length = htons(parameter_len);
4782                 chunk_len += parameter_len;
4783         }
4784         /* Add NAT friendly parameter. */
4785         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4786                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4787                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4788                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4789                 ph->param_length = htons(parameter_len);
4790                 chunk_len += parameter_len;
4791         }
4792         /* And now tell the peer which extensions we support */
4793         num_ext = 0;
4794         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4795         if (stcb->asoc.prsctp_supported == 1) {
4796                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4797         }
4798         if (stcb->asoc.auth_supported == 1) {
4799                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4800         }
4801         if (stcb->asoc.asconf_supported == 1) {
4802                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4803                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4804         }
4805         if (stcb->asoc.reconfig_supported == 1) {
4806                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4807         }
4808         if (stcb->asoc.nrsack_supported == 1) {
4809                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4810         }
4811         if (stcb->asoc.pktdrop_supported == 1) {
4812                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4813         }
4814         if (num_ext > 0) {
4815                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4816                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4817                 pr_supported->ph.param_length = htons(parameter_len);
4818                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4819                 chunk_len += parameter_len;
4820         }
4821         /* add authentication parameters */
4822         if (stcb->asoc.auth_supported) {
4823                 /* attach RANDOM parameter, if available */
4824                 if (stcb->asoc.authinfo.random != NULL) {
4825                         struct sctp_auth_random *randp;
4826
4827                         if (padding_len > 0) {
4828                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4829                                 chunk_len += padding_len;
4830                                 padding_len = 0;
4831                         }
4832                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4833                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4834                         /* random key already contains the header */
4835                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4836                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4837                         chunk_len += parameter_len;
4838                 }
4839                 /* add HMAC_ALGO parameter */
4840                 if (stcb->asoc.local_hmacs != NULL) {
4841                         struct sctp_auth_hmac_algo *hmacs;
4842
4843                         if (padding_len > 0) {
4844                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4845                                 chunk_len += padding_len;
4846                                 padding_len = 0;
4847                         }
4848                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4849                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4850                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4851                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4852                         hmacs->ph.param_length = htons(parameter_len);
4853                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4854                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4855                         chunk_len += parameter_len;
4856                 }
4857                 /* add CHUNKS parameter */
4858                 if (stcb->asoc.local_auth_chunks != NULL) {
4859                         struct sctp_auth_chunk_list *chunks;
4860
4861                         if (padding_len > 0) {
4862                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4863                                 chunk_len += padding_len;
4864                                 padding_len = 0;
4865                         }
4866                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4867                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4868                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4869                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4870                         chunks->ph.param_length = htons(parameter_len);
4871                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4872                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4873                         chunk_len += parameter_len;
4874                 }
4875         }
4876         /* now any cookie time extensions */
4877         if (stcb->asoc.cookie_preserve_req) {
4878                 struct sctp_cookie_perserve_param *cookie_preserve;
4879
4880                 if (padding_len > 0) {
4881                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4882                         chunk_len += padding_len;
4883                         padding_len = 0;
4884                 }
4885                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4886                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4887                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4888                 cookie_preserve->ph.param_length = htons(parameter_len);
4889                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4890                 stcb->asoc.cookie_preserve_req = 0;
4891                 chunk_len += parameter_len;
4892         }
4893         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4894                 uint8_t i;
4895
4896                 if (padding_len > 0) {
4897                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4898                         chunk_len += padding_len;
4899                         padding_len = 0;
4900                 }
4901                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4902                 if (stcb->asoc.scope.ipv4_addr_legal) {
4903                         parameter_len += (uint16_t) sizeof(uint16_t);
4904                 }
4905                 if (stcb->asoc.scope.ipv6_addr_legal) {
4906                         parameter_len += (uint16_t) sizeof(uint16_t);
4907                 }
4908                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4909                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4910                 sup_addr->ph.param_length = htons(parameter_len);
4911                 i = 0;
4912                 if (stcb->asoc.scope.ipv4_addr_legal) {
4913                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4914                 }
4915                 if (stcb->asoc.scope.ipv6_addr_legal) {
4916                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4917                 }
4918                 padding_len = 4 - 2 * i;
4919                 chunk_len += parameter_len;
4920         }
4921         SCTP_BUF_LEN(m) = chunk_len;
4922         /* now the addresses */
4923         /*
4924          * To optimize this we could put the scoping stuff into a structure
4925          * and remove the individual uint8's from the assoc structure. Then
4926          * we could just sifa in the address within the stcb. But for now
4927          * this is a quick hack to get the address stuff teased apart.
4928          */
4929         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4930             m, cnt_inits_to,
4931             &padding_len, &chunk_len);
4932
4933         init->ch.chunk_length = htons(chunk_len);
4934         if (padding_len > 0) {
4935                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4936                         sctp_m_freem(m);
4937                         return;
4938                 }
4939         }
4940         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4941         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4942             (struct sockaddr *)&net->ro._l_addr,
4943             m, 0, NULL, 0, 0, 0, 0,
4944             inp->sctp_lport, stcb->rport, htonl(0),
4945             net->port, NULL,
4946             0, 0,
4947             so_locked);
4948         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4949         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4950         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4951 }
4952
4953 struct mbuf *
4954 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4955     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4956 {
4957         /*
4958          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4959          * being equal to the beginning of the params i.e. (iphlen +
4960          * sizeof(struct sctp_init_msg) parse through the parameters to the
4961          * end of the mbuf verifying that all parameters are known.
4962          *
4963          * For unknown parameters build and return a mbuf with
4964          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4965          * processing this chunk stop, and set *abort_processing to 1.
4966          *
4967          * By having param_offset be pre-set to where parameters begin it is
4968          * hoped that this routine may be reused in the future by new
4969          * features.
4970          */
4971         struct sctp_paramhdr *phdr, params;
4972
4973         struct mbuf *mat, *op_err;
4974         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4975         int at, limit, pad_needed;
4976         uint16_t ptype, plen, padded_size;
4977         int err_at;
4978
4979         *abort_processing = 0;
4980         mat = in_initpkt;
4981         err_at = 0;
4982         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4983         at = param_offset;
4984         op_err = NULL;
4985         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4986         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4987         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4988                 ptype = ntohs(phdr->param_type);
4989                 plen = ntohs(phdr->param_length);
4990                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4991                         /* wacked parameter */
4992                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4993                         goto invalid_size;
4994                 }
4995                 limit -= SCTP_SIZE32(plen);
4996                 /*-
4997                  * All parameters for all chunks that we know/understand are
4998                  * listed here. We process them other places and make
4999                  * appropriate stop actions per the upper bits. However this
5000                  * is the generic routine processor's can call to get back
5001                  * an operr.. to either incorporate (init-ack) or send.
5002                  */
5003                 padded_size = SCTP_SIZE32(plen);
5004                 switch (ptype) {
5005                         /* Param's with variable size */
5006                 case SCTP_HEARTBEAT_INFO:
5007                 case SCTP_STATE_COOKIE:
5008                 case SCTP_UNRECOG_PARAM:
5009                 case SCTP_ERROR_CAUSE_IND:
5010                         /* ok skip fwd */
5011                         at += padded_size;
5012                         break;
5013                         /* Param's with variable size within a range */
5014                 case SCTP_CHUNK_LIST:
5015                 case SCTP_SUPPORTED_CHUNK_EXT:
5016                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5017                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5018                                 goto invalid_size;
5019                         }
5020                         at += padded_size;
5021                         break;
5022                 case SCTP_SUPPORTED_ADDRTYPE:
5023                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5024                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5025                                 goto invalid_size;
5026                         }
5027                         at += padded_size;
5028                         break;
5029                 case SCTP_RANDOM:
5030                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5031                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5032                                 goto invalid_size;
5033                         }
5034                         at += padded_size;
5035                         break;
5036                 case SCTP_SET_PRIM_ADDR:
5037                 case SCTP_DEL_IP_ADDRESS:
5038                 case SCTP_ADD_IP_ADDRESS:
5039                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5040                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                         /* Param's with a fixed size */
5047                 case SCTP_IPV4_ADDRESS:
5048                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5049                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5050                                 goto invalid_size;
5051                         }
5052                         at += padded_size;
5053                         break;
5054                 case SCTP_IPV6_ADDRESS:
5055                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5056                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5057                                 goto invalid_size;
5058                         }
5059                         at += padded_size;
5060                         break;
5061                 case SCTP_COOKIE_PRESERVE:
5062                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5063                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5064                                 goto invalid_size;
5065                         }
5066                         at += padded_size;
5067                         break;
5068                 case SCTP_HAS_NAT_SUPPORT:
5069                         *nat_friendly = 1;
5070                         /* fall through */
5071                 case SCTP_PRSCTP_SUPPORTED:
5072                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_ECN_CAPABLE:
5079                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5081                                 goto invalid_size;
5082                         }
5083                         at += padded_size;
5084                         break;
5085                 case SCTP_ULP_ADAPTATION:
5086                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5087                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5088                                 goto invalid_size;
5089                         }
5090                         at += padded_size;
5091                         break;
5092                 case SCTP_SUCCESS_REPORT:
5093                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5094                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5095                                 goto invalid_size;
5096                         }
5097                         at += padded_size;
5098                         break;
5099                 case SCTP_HOSTNAME_ADDRESS:
5100                         {
5101                                 /* We can NOT handle HOST NAME addresses!! */
5102                                 int l_len;
5103
5104                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5105                                 *abort_processing = 1;
5106                                 if (op_err == NULL) {
5107                                         /* Ok need to try to get a mbuf */
5108 #ifdef INET6
5109                                         l_len = SCTP_MIN_OVERHEAD;
5110 #else
5111                                         l_len = SCTP_MIN_V4_OVERHEAD;
5112 #endif
5113                                         l_len += sizeof(struct sctp_chunkhdr);
5114                                         l_len += plen;
5115                                         l_len += sizeof(struct sctp_paramhdr);
5116                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5117                                         if (op_err) {
5118                                                 SCTP_BUF_LEN(op_err) = 0;
5119                                                 /*
5120                                                  * pre-reserve space for ip
5121                                                  * and sctp header  and
5122                                                  * chunk hdr
5123                                                  */
5124 #ifdef INET6
5125                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5126 #else
5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5128 #endif
5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5130                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5131                                         }
5132                                 }
5133                                 if (op_err) {
5134                                         /* If we have space */
5135                                         struct sctp_paramhdr s;
5136
5137                                         if (err_at % 4) {
5138                                                 uint32_t cpthis = 0;
5139
5140                                                 pad_needed = 4 - (err_at % 4);
5141                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5142                                                 err_at += pad_needed;
5143                                         }
5144                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5145                                         s.param_length = htons(sizeof(s) + plen);
5146                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5147                                         err_at += sizeof(s);
5148                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5149                                         if (phdr == NULL) {
5150                                                 sctp_m_freem(op_err);
5151                                                 /*
5152                                                  * we are out of memory but
5153                                                  * we still need to have a
5154                                                  * look at what to do (the
5155                                                  * system is in trouble
5156                                                  * though).
5157                                                  */
5158                                                 return (NULL);
5159                                         }
5160                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5161                                 }
5162                                 return (op_err);
5163                                 break;
5164                         }
5165                 default:
5166                         /*
5167                          * we do not recognize the parameter figure out what
5168                          * we do.
5169                          */
5170                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5171                         if ((ptype & 0x4000) == 0x4000) {
5172                                 /* Report bit is set?? */
5173                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5174                                 if (op_err == NULL) {
5175                                         int l_len;
5176
5177                                         /* Ok need to try to get an mbuf */
5178 #ifdef INET6
5179                                         l_len = SCTP_MIN_OVERHEAD;
5180 #else
5181                                         l_len = SCTP_MIN_V4_OVERHEAD;
5182 #endif
5183                                         l_len += sizeof(struct sctp_chunkhdr);
5184                                         l_len += plen;
5185                                         l_len += sizeof(struct sctp_paramhdr);
5186                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5187                                         if (op_err) {
5188                                                 SCTP_BUF_LEN(op_err) = 0;
5189 #ifdef INET6
5190                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5191 #else
5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5193 #endif
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5195                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5196                                         }
5197                                 }
5198                                 if (op_err) {
5199                                         /* If we have space */
5200                                         struct sctp_paramhdr s;
5201
5202                                         if (err_at % 4) {
5203                                                 uint32_t cpthis = 0;
5204
5205                                                 pad_needed = 4 - (err_at % 4);
5206                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5207                                                 err_at += pad_needed;
5208                                         }
5209                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5210                                         s.param_length = htons(sizeof(s) + plen);
5211                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5212                                         err_at += sizeof(s);
5213                                         if (plen > sizeof(tempbuf)) {
5214                                                 plen = sizeof(tempbuf);
5215                                         }
5216                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5217                                         if (phdr == NULL) {
5218                                                 sctp_m_freem(op_err);
5219                                                 /*
5220                                                  * we are out of memory but
5221                                                  * we still need to have a
5222                                                  * look at what to do (the
5223                                                  * system is in trouble
5224                                                  * though).
5225                                                  */
5226                                                 op_err = NULL;
5227                                                 goto more_processing;
5228                                         }
5229                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5230                                         err_at += plen;
5231                                 }
5232                         }
5233         more_processing:
5234                         if ((ptype & 0x8000) == 0x0000) {
5235                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5236                                 return (op_err);
5237                         } else {
5238                                 /* skip this chunk and continue processing */
5239                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5240                                 at += SCTP_SIZE32(plen);
5241                         }
5242                         break;
5243
5244                 }
5245                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5246         }
5247         return (op_err);
5248 invalid_size:
5249         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5250         *abort_processing = 1;
5251         if ((op_err == NULL) && phdr) {
5252                 int l_len;
5253
5254 #ifdef INET6
5255                 l_len = SCTP_MIN_OVERHEAD;
5256 #else
5257                 l_len = SCTP_MIN_V4_OVERHEAD;
5258 #endif
5259                 l_len += sizeof(struct sctp_chunkhdr);
5260                 l_len += (2 * sizeof(struct sctp_paramhdr));
5261                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5262                 if (op_err) {
5263                         SCTP_BUF_LEN(op_err) = 0;
5264 #ifdef INET6
5265                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5266 #else
5267                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5268 #endif
5269                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5270                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5271                 }
5272         }
5273         if ((op_err) && phdr) {
5274                 struct sctp_paramhdr s;
5275
5276                 if (err_at % 4) {
5277                         uint32_t cpthis = 0;
5278
5279                         pad_needed = 4 - (err_at % 4);
5280                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5281                         err_at += pad_needed;
5282                 }
5283                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5284                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5285                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5286                 err_at += sizeof(s);
5287                 /* Only copy back the p-hdr that caused the issue */
5288                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5289         }
5290         return (op_err);
5291 }
5292
5293 static int
5294 sctp_are_there_new_addresses(struct sctp_association *asoc,
5295     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5296 {
5297         /*
5298          * Given a INIT packet, look through the packet to verify that there
5299          * are NO new addresses. As we go through the parameters add reports
5300          * of any un-understood parameters that require an error.  Also we
5301          * must return (1) to drop the packet if we see a un-understood
5302          * parameter that tells us to drop the chunk.
5303          */
5304         struct sockaddr *sa_touse;
5305         struct sockaddr *sa;
5306         struct sctp_paramhdr *phdr, params;
5307         uint16_t ptype, plen;
5308         uint8_t fnd;
5309         struct sctp_nets *net;
5310         int check_src;
5311
5312 #ifdef INET
5313         struct sockaddr_in sin4, *sa4;
5314
5315 #endif
5316 #ifdef INET6
5317         struct sockaddr_in6 sin6, *sa6;
5318
5319 #endif
5320
5321 #ifdef INET
5322         memset(&sin4, 0, sizeof(sin4));
5323         sin4.sin_family = AF_INET;
5324         sin4.sin_len = sizeof(sin4);
5325 #endif
5326 #ifdef INET6
5327         memset(&sin6, 0, sizeof(sin6));
5328         sin6.sin6_family = AF_INET6;
5329         sin6.sin6_len = sizeof(sin6);
5330 #endif
5331         /* First what about the src address of the pkt ? */
5332         check_src = 0;
5333         switch (src->sa_family) {
5334 #ifdef INET
5335         case AF_INET:
5336                 if (asoc->scope.ipv4_addr_legal) {
5337                         check_src = 1;
5338                 }
5339                 break;
5340 #endif
5341 #ifdef INET6
5342         case AF_INET6:
5343                 if (asoc->scope.ipv6_addr_legal) {
5344                         check_src = 1;
5345                 }
5346                 break;
5347 #endif
5348         default:
5349                 /* TSNH */
5350                 break;
5351         }
5352         if (check_src) {
5353                 fnd = 0;
5354                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5355                         sa = (struct sockaddr *)&net->ro._l_addr;
5356                         if (sa->sa_family == src->sa_family) {
5357 #ifdef INET
5358                                 if (sa->sa_family == AF_INET) {
5359                                         struct sockaddr_in *src4;
5360
5361                                         sa4 = (struct sockaddr_in *)sa;
5362                                         src4 = (struct sockaddr_in *)src;
5363                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5364                                                 fnd = 1;
5365                                                 break;
5366                                         }
5367                                 }
5368 #endif
5369 #ifdef INET6
5370                                 if (sa->sa_family == AF_INET6) {
5371                                         struct sockaddr_in6 *src6;
5372
5373                                         sa6 = (struct sockaddr_in6 *)sa;
5374                                         src6 = (struct sockaddr_in6 *)src;
5375                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5376                                                 fnd = 1;
5377                                                 break;
5378                                         }
5379                                 }
5380 #endif
5381                         }
5382                 }
5383                 if (fnd == 0) {
5384                         /* New address added! no need to look futher. */
5385                         return (1);
5386                 }
5387         }
5388         /* Ok so far lets munge through the rest of the packet */
5389         offset += sizeof(struct sctp_init_chunk);
5390         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5391         while (phdr) {
5392                 sa_touse = NULL;
5393                 ptype = ntohs(phdr->param_type);
5394                 plen = ntohs(phdr->param_length);
5395                 switch (ptype) {
5396 #ifdef INET
5397                 case SCTP_IPV4_ADDRESS:
5398                         {
5399                                 struct sctp_ipv4addr_param *p4, p4_buf;
5400
5401                                 phdr = sctp_get_next_param(in_initpkt, offset,
5402                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5403                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5404                                     phdr == NULL) {
5405                                         return (1);
5406                                 }
5407                                 if (asoc->scope.ipv4_addr_legal) {
5408                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5409                                         sin4.sin_addr.s_addr = p4->addr;
5410                                         sa_touse = (struct sockaddr *)&sin4;
5411                                 }
5412                                 break;
5413                         }
5414 #endif
5415 #ifdef INET6
5416                 case SCTP_IPV6_ADDRESS:
5417                         {
5418                                 struct sctp_ipv6addr_param *p6, p6_buf;
5419
5420                                 phdr = sctp_get_next_param(in_initpkt, offset,
5421                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5422                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5423                                     phdr == NULL) {
5424                                         return (1);
5425                                 }
5426                                 if (asoc->scope.ipv6_addr_legal) {
5427                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5428                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5429                                             sizeof(p6->addr));
5430                                         sa_touse = (struct sockaddr *)&sin6;
5431                                 }
5432                                 break;
5433                         }
5434 #endif
5435                 default:
5436                         sa_touse = NULL;
5437                         break;
5438                 }
5439                 if (sa_touse) {
5440                         /* ok, sa_touse points to one to check */
5441                         fnd = 0;
5442                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5443                                 sa = (struct sockaddr *)&net->ro._l_addr;
5444                                 if (sa->sa_family != sa_touse->sa_family) {
5445                                         continue;
5446                                 }
5447 #ifdef INET
5448                                 if (sa->sa_family == AF_INET) {
5449                                         sa4 = (struct sockaddr_in *)sa;
5450                                         if (sa4->sin_addr.s_addr ==
5451                                             sin4.sin_addr.s_addr) {
5452                                                 fnd = 1;
5453                                                 break;
5454                                         }
5455                                 }
5456 #endif
5457 #ifdef INET6
5458                                 if (sa->sa_family == AF_INET6) {
5459                                         sa6 = (struct sockaddr_in6 *)sa;
5460                                         if (SCTP6_ARE_ADDR_EQUAL(
5461                                             sa6, &sin6)) {
5462                                                 fnd = 1;
5463                                                 break;
5464                                         }
5465                                 }
5466 #endif
5467                         }
5468                         if (!fnd) {
5469                                 /* New addr added! no need to look further */
5470                                 return (1);
5471                         }
5472                 }
5473                 offset += SCTP_SIZE32(plen);
5474                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5475         }
5476         return (0);
5477 }
5478
5479 /*
5480  * Given a MBUF chain that was sent into us containing an INIT. Build a
5481  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5482  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5483  * message (i.e. the struct sctp_init_msg).
5484  */
5485 void
5486 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5487     struct sctp_nets *src_net, struct mbuf *init_pkt,
5488     int iphlen, int offset,
5489     struct sockaddr *src, struct sockaddr *dst,
5490     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5491     uint8_t mflowtype, uint32_t mflowid,
5492     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5493 {
5494         struct sctp_association *asoc;
5495         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5496         struct sctp_init_ack_chunk *initack;
5497         struct sctp_adaptation_layer_indication *ali;
5498         struct sctp_supported_chunk_types_param *pr_supported;
5499         struct sctp_paramhdr *ph;
5500         union sctp_sockstore *over_addr;
5501         struct sctp_scoping scp;
5502
5503 #ifdef INET
5504         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5505         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5506         struct sockaddr_in *sin;
5507
5508 #endif
5509 #ifdef INET6
5510         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5511         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5512         struct sockaddr_in6 *sin6;
5513
5514 #endif
5515         struct sockaddr *to;
5516         struct sctp_state_cookie stc;
5517         struct sctp_nets *net = NULL;
5518         uint8_t *signature = NULL;
5519         int cnt_inits_to = 0;
5520         uint16_t his_limit, i_want;
5521         int abort_flag;
5522         int nat_friendly = 0;
5523         struct socket *so;
5524         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5525
5526         if (stcb) {
5527                 asoc = &stcb->asoc;
5528         } else {
5529                 asoc = NULL;
5530         }
5531         if ((asoc != NULL) &&
5532             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5533                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5534                         /*
5535                          * new addresses, out of here in non-cookie-wait
5536                          * states
5537                          *
5538                          * Send an ABORT, without the new address error cause.
5539                          * This looks no different than if no listener was
5540                          * present.
5541                          */
5542                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5543                             "Address added");
5544                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5545                             mflowtype, mflowid, inp->fibnum,
5546                             vrf_id, port);
5547                         return;
5548                 }
5549                 if (src_net != NULL && (src_net->port != port)) {
5550                         /*
5551                          * change of remote encapsulation port, out of here
5552                          * in non-cookie-wait states
5553                          *
5554                          * Send an ABORT, without an specific error cause. This
5555                          * looks no different than if no listener was
5556                          * present.
5557                          */
5558                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5559                             "Remote encapsulation port changed");
5560                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5561                             mflowtype, mflowid, inp->fibnum,
5562                             vrf_id, port);
5563                         return;
5564                 }
5565         }
5566         abort_flag = 0;
5567         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5568             (offset + sizeof(struct sctp_init_chunk)),
5569             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5570         if (abort_flag) {
5571 do_a_abort:
5572                 if (op_err == NULL) {
5573                         char msg[SCTP_DIAG_INFO_LEN];
5574
5575                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5576                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5577                             msg);
5578                 }
5579                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5580                     init_chk->init.initiate_tag, op_err,
5581                     mflowtype, mflowid, inp->fibnum,
5582                     vrf_id, port);
5583                 return;
5584         }
5585         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5586         if (m == NULL) {
5587                 /* No memory, INIT timer will re-attempt. */
5588                 if (op_err)
5589                         sctp_m_freem(op_err);
5590                 return;
5591         }
5592         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5593         padding_len = 0;
5594
5595         /*
5596          * We might not overwrite the identification[] completely and on
5597          * some platforms time_entered will contain some padding. Therefore
5598          * zero out the cookie to avoid putting uninitialized memory on the
5599          * wire.
5600          */
5601         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5602
5603         /* the time I built cookie */
5604         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5605
5606         /* populate any tie tags */
5607         if (asoc != NULL) {
5608                 /* unlock before tag selections */
5609                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5610                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5611                 stc.cookie_life = asoc->cookie_life;
5612                 net = asoc->primary_destination;
5613         } else {
5614                 stc.tie_tag_my_vtag = 0;
5615                 stc.tie_tag_peer_vtag = 0;
5616                 /* life I will award this cookie */
5617                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5618         }
5619
5620         /* copy in the ports for later check */
5621         stc.myport = sh->dest_port;
5622         stc.peerport = sh->src_port;
5623
5624         /*
5625          * If we wanted to honor cookie life extentions, we would add to
5626          * stc.cookie_life. For now we should NOT honor any extension
5627          */
5628         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5629         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5630                 stc.ipv6_addr_legal = 1;
5631                 if (SCTP_IPV6_V6ONLY(inp)) {
5632                         stc.ipv4_addr_legal = 0;
5633                 } else {
5634                         stc.ipv4_addr_legal = 1;
5635                 }
5636         } else {
5637                 stc.ipv6_addr_legal = 0;
5638                 stc.ipv4_addr_legal = 1;
5639         }
5640         stc.ipv4_scope = 0;
5641         if (net == NULL) {
5642                 to = src;
5643                 switch (dst->sa_family) {
5644 #ifdef INET
5645                 case AF_INET:
5646                         {
5647                                 /* lookup address */
5648                                 stc.address[0] = src4->sin_addr.s_addr;
5649                                 stc.address[1] = 0;
5650                                 stc.address[2] = 0;
5651                                 stc.address[3] = 0;
5652                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5653                                 /* local from address */
5654                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5655                                 stc.laddress[1] = 0;
5656                                 stc.laddress[2] = 0;
5657                                 stc.laddress[3] = 0;
5658                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5659                                 /* scope_id is only for v6 */
5660                                 stc.scope_id = 0;
5661                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5662                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5663                                         stc.ipv4_scope = 1;
5664                                 }
5665                                 /* Must use the address in this case */
5666                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5667                                         stc.loopback_scope = 1;
5668                                         stc.ipv4_scope = 1;
5669                                         stc.site_scope = 1;
5670                                         stc.local_scope = 0;
5671                                 }
5672                                 break;
5673                         }
5674 #endif
5675 #ifdef INET6
5676                 case AF_INET6:
5677                         {
5678                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5679                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5680                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5681                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5682                                         stc.loopback_scope = 1;
5683                                         stc.local_scope = 0;
5684                                         stc.site_scope = 1;
5685                                         stc.ipv4_scope = 1;
5686                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5687                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5688                                         /*
5689                                          * If the new destination or source
5690                                          * is a LINK_LOCAL we must have
5691                                          * common both site and local scope.
5692                                          * Don't set local scope though
5693                                          * since we must depend on the
5694                                          * source to be added implicitly. We
5695                                          * cannot assure just because we
5696                                          * share one link that all links are
5697                                          * common.
5698                                          */
5699                                         stc.local_scope = 0;
5700                                         stc.site_scope = 1;
5701                                         stc.ipv4_scope = 1;
5702                                         /*
5703                                          * we start counting for the private
5704                                          * address stuff at 1. since the
5705                                          * link local we source from won't
5706                                          * show up in our scoped count.
5707                                          */
5708                                         cnt_inits_to = 1;
5709                                         /*
5710                                          * pull out the scope_id from
5711                                          * incoming pkt
5712                                          */
5713                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5714                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5715                                         /*
5716                                          * If the new destination or source
5717                                          * is SITE_LOCAL then we must have
5718                                          * site scope in common.
5719                                          */
5720                                         stc.site_scope = 1;
5721                                 }
5722                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5723                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5724                                 break;
5725                         }
5726 #endif
5727                 default:
5728                         /* TSNH */
5729                         goto do_a_abort;
5730                         break;
5731                 }
5732         } else {
5733                 /* set the scope per the existing tcb */
5734
5735 #ifdef INET6
5736                 struct sctp_nets *lnet;
5737
5738 #endif
5739
5740                 stc.loopback_scope = asoc->scope.loopback_scope;
5741                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5742                 stc.site_scope = asoc->scope.site_scope;
5743                 stc.local_scope = asoc->scope.local_scope;
5744 #ifdef INET6
5745                 /* Why do we not consider IPv4 LL addresses? */
5746                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5747                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5748                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5749                                         /*
5750                                          * if we have a LL address, start
5751                                          * counting at 1.
5752                                          */
5753                                         cnt_inits_to = 1;
5754                                 }
5755                         }
5756                 }
5757 #endif
5758                 /* use the net pointer */
5759                 to = (struct sockaddr *)&net->ro._l_addr;
5760                 switch (to->sa_family) {
5761 #ifdef INET
5762                 case AF_INET:
5763                         sin = (struct sockaddr_in *)to;
5764                         stc.address[0] = sin->sin_addr.s_addr;
5765                         stc.address[1] = 0;
5766                         stc.address[2] = 0;
5767                         stc.address[3] = 0;
5768                         stc.addr_type = SCTP_IPV4_ADDRESS;
5769                         if (net->src_addr_selected == 0) {
5770                                 /*
5771                                  * strange case here, the INIT should have
5772                                  * did the selection.
5773                                  */
5774                                 net->ro._s_addr = sctp_source_address_selection(inp,
5775                                     stcb, (sctp_route_t *) & net->ro,
5776                                     net, 0, vrf_id);
5777                                 if (net->ro._s_addr == NULL)
5778                                         return;
5779
5780                                 net->src_addr_selected = 1;
5781
5782                         }
5783                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5784                         stc.laddress[1] = 0;
5785                         stc.laddress[2] = 0;
5786                         stc.laddress[3] = 0;
5787                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5788                         /* scope_id is only for v6 */
5789                         stc.scope_id = 0;
5790                         break;
5791 #endif
5792 #ifdef INET6
5793                 case AF_INET6:
5794                         sin6 = (struct sockaddr_in6 *)to;
5795                         memcpy(&stc.address, &sin6->sin6_addr,
5796                             sizeof(struct in6_addr));
5797                         stc.addr_type = SCTP_IPV6_ADDRESS;
5798                         stc.scope_id = sin6->sin6_scope_id;
5799                         if (net->src_addr_selected == 0) {
5800                                 /*
5801                                  * strange case here, the INIT should have
5802                                  * done the selection.
5803                                  */
5804                                 net->ro._s_addr = sctp_source_address_selection(inp,
5805                                     stcb, (sctp_route_t *) & net->ro,
5806                                     net, 0, vrf_id);
5807                                 if (net->ro._s_addr == NULL)
5808                                         return;
5809
5810                                 net->src_addr_selected = 1;
5811                         }
5812                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5813                             sizeof(struct in6_addr));
5814                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5815                         break;
5816 #endif
5817                 }
5818         }
5819         /* Now lets put the SCTP header in place */
5820         initack = mtod(m, struct sctp_init_ack_chunk *);
5821         /* Save it off for quick ref */
5822         stc.peers_vtag = init_chk->init.initiate_tag;
5823         /* who are we */
5824         memcpy(stc.identification, SCTP_VERSION_STRING,
5825             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5826         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5827         /* now the chunk header */
5828         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5829         initack->ch.chunk_flags = 0;
5830         /* fill in later from mbuf we build */
5831         initack->ch.chunk_length = 0;
5832         /* place in my tag */
5833         if ((asoc != NULL) &&
5834             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5835             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5836             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5837                 /* re-use the v-tags and init-seq here */
5838                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5839                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5840         } else {
5841                 uint32_t vtag, itsn;
5842
5843                 if (hold_inp_lock) {
5844                         SCTP_INP_INCR_REF(inp);
5845                         SCTP_INP_RUNLOCK(inp);
5846                 }
5847                 if (asoc) {
5848                         atomic_add_int(&asoc->refcnt, 1);
5849                         SCTP_TCB_UNLOCK(stcb);
5850         new_tag:
5851                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5852                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5853                                 /*
5854                                  * Got a duplicate vtag on some guy behind a
5855                                  * nat make sure we don't use it.
5856                                  */
5857                                 goto new_tag;
5858                         }
5859                         initack->init.initiate_tag = htonl(vtag);
5860                         /* get a TSN to use too */
5861                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5862                         initack->init.initial_tsn = htonl(itsn);
5863                         SCTP_TCB_LOCK(stcb);
5864                         atomic_add_int(&asoc->refcnt, -1);
5865                 } else {
5866                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5867                         initack->init.initiate_tag = htonl(vtag);
5868                         /* get a TSN to use too */
5869                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5870                 }
5871                 if (hold_inp_lock) {
5872                         SCTP_INP_RLOCK(inp);
5873                         SCTP_INP_DECR_REF(inp);
5874                 }
5875         }
5876         /* save away my tag to */
5877         stc.my_vtag = initack->init.initiate_tag;
5878
5879         /* set up some of the credits. */
5880         so = inp->sctp_socket;
5881         if (so == NULL) {
5882                 /* memory problem */
5883                 sctp_m_freem(m);
5884                 return;
5885         } else {
5886                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5887         }
5888         /* set what I want */
5889         his_limit = ntohs(init_chk->init.num_inbound_streams);
5890         /* choose what I want */
5891         if (asoc != NULL) {
5892                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5893                         i_want = asoc->streamoutcnt;
5894                 } else {
5895                         i_want = asoc->pre_open_streams;
5896                 }
5897         } else {
5898                 i_want = inp->sctp_ep.pre_open_stream_count;
5899         }
5900         if (his_limit < i_want) {
5901                 /* I Want more :< */
5902                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5903         } else {
5904                 /* I can have what I want :> */
5905                 initack->init.num_outbound_streams = htons(i_want);
5906         }
5907         /* tell him his limit. */
5908         initack->init.num_inbound_streams =
5909             htons(inp->sctp_ep.max_open_streams_intome);
5910
5911         /* adaptation layer indication parameter */
5912         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5913                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5914                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5915                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5916                 ali->ph.param_length = htons(parameter_len);
5917                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5918                 chunk_len += parameter_len;
5919         }
5920         /* ECN parameter */
5921         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5922             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5923                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5924                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5925                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5926                 ph->param_length = htons(parameter_len);
5927                 chunk_len += parameter_len;
5928         }
5929         /* PR-SCTP supported parameter */
5930         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5931             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5932                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5933                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5934                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5935                 ph->param_length = htons(parameter_len);
5936                 chunk_len += parameter_len;
5937         }
5938         /* Add NAT friendly parameter */
5939         if (nat_friendly) {
5940                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5941                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5942                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5943                 ph->param_length = htons(parameter_len);
5944                 chunk_len += parameter_len;
5945         }
5946         /* And now tell the peer which extensions we support */
5947         num_ext = 0;
5948         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5949         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5950             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5951                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5952         }
5953         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5954             ((asoc == NULL) && (inp->auth_supported == 1))) {
5955                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5956         }
5957         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5958             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5959                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5960                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5961         }
5962         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5963             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5964                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5965         }
5966         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5967             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5968                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5969         }
5970         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5971             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5973         }
5974         if (num_ext > 0) {
5975                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5976                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5977                 pr_supported->ph.param_length = htons(parameter_len);
5978                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5979                 chunk_len += parameter_len;
5980         }
5981         /* add authentication parameters */
5982         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5983             ((asoc == NULL) && (inp->auth_supported == 1))) {
5984                 struct sctp_auth_random *randp;
5985                 struct sctp_auth_hmac_algo *hmacs;
5986                 struct sctp_auth_chunk_list *chunks;
5987
5988                 if (padding_len > 0) {
5989                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5990                         chunk_len += padding_len;
5991                         padding_len = 0;
5992                 }
5993                 /* generate and add RANDOM parameter */
5994                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5995                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5996                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5997                 randp->ph.param_type = htons(SCTP_RANDOM);
5998                 randp->ph.param_length = htons(parameter_len);
5999                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6000                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6001                 chunk_len += parameter_len;
6002
6003                 if (padding_len > 0) {
6004                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6005                         chunk_len += padding_len;
6006                         padding_len = 0;
6007                 }
6008                 /* add HMAC_ALGO parameter */
6009                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6010                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
6011                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6012                     (uint8_t *) hmacs->hmac_ids);
6013                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6014                 hmacs->ph.param_length = htons(parameter_len);
6015                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6016                 chunk_len += parameter_len;
6017
6018                 if (padding_len > 0) {
6019                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6020                         chunk_len += padding_len;
6021                         padding_len = 0;
6022                 }
6023                 /* add CHUNKS parameter */
6024                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6025                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
6026                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6027                     chunks->chunk_types);
6028                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6029                 chunks->ph.param_length = htons(parameter_len);
6030                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6031                 chunk_len += parameter_len;
6032         }
6033         SCTP_BUF_LEN(m) = chunk_len;
6034         m_last = m;
6035         /* now the addresses */
6036         /*
6037          * To optimize this we could put the scoping stuff into a structure
6038          * and remove the individual uint8's from the stc structure. Then we
6039          * could just sifa in the address within the stc.. but for now this
6040          * is a quick hack to get the address stuff teased apart.
6041          */
6042         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6043         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6044         scp.loopback_scope = stc.loopback_scope;
6045         scp.ipv4_local_scope = stc.ipv4_scope;
6046         scp.local_scope = stc.local_scope;
6047         scp.site_scope = stc.site_scope;
6048         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6049             cnt_inits_to,
6050             &padding_len, &chunk_len);
6051         /* padding_len can only be positive, if no addresses have been added */
6052         if (padding_len > 0) {
6053                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6054                 chunk_len += padding_len;
6055                 SCTP_BUF_LEN(m) += padding_len;
6056                 padding_len = 0;
6057         }
6058         /* tack on the operational error if present */
6059         if (op_err) {
6060                 parameter_len = 0;
6061                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6062                         parameter_len += SCTP_BUF_LEN(m_tmp);
6063                 }
6064                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6065                 SCTP_BUF_NEXT(m_last) = op_err;
6066                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6067                         m_last = SCTP_BUF_NEXT(m_last);
6068                 }
6069                 chunk_len += parameter_len;
6070         }
6071         if (padding_len > 0) {
6072                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6073                 if (m_last == NULL) {
6074                         /* Houston we have a problem, no space */
6075                         sctp_m_freem(m);
6076                         return;
6077                 }
6078                 chunk_len += padding_len;
6079                 padding_len = 0;
6080         }
6081         /* Now we must build a cookie */
6082         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6083         if (m_cookie == NULL) {
6084                 /* memory problem */
6085                 sctp_m_freem(m);
6086                 return;
6087         }
6088         /* Now append the cookie to the end and update the space/size */
6089         SCTP_BUF_NEXT(m_last) = m_cookie;
6090         parameter_len = 0;
6091         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6092                 parameter_len += SCTP_BUF_LEN(m_tmp);
6093                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6094                         m_last = m_tmp;
6095                 }
6096         }
6097         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6098         chunk_len += parameter_len;
6099
6100         /*
6101          * Place in the size, but we don't include the last pad (if any) in
6102          * the INIT-ACK.
6103          */
6104         initack->ch.chunk_length = htons(chunk_len);
6105
6106         /*
6107          * Time to sign the cookie, we don't sign over the cookie signature
6108          * though thus we set trailer.
6109          */
6110         (void)sctp_hmac_m(SCTP_HMAC,
6111             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6112             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6113             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6114         /*
6115          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6116          * here since the timer will drive a retranmission.
6117          */
6118         if (padding_len > 0) {
6119                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6120                         sctp_m_freem(m);
6121                         return;
6122                 }
6123         }
6124         if (stc.loopback_scope) {
6125                 over_addr = (union sctp_sockstore *)dst;
6126         } else {
6127                 over_addr = NULL;
6128         }
6129
6130         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6131             0, 0,
6132             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6133             port, over_addr,
6134             mflowtype, mflowid,
6135             SCTP_SO_NOT_LOCKED);
6136         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6137 }
6138
6139
6140 static void
6141 sctp_prune_prsctp(struct sctp_tcb *stcb,
6142     struct sctp_association *asoc,
6143     struct sctp_sndrcvinfo *srcv,
6144     int dataout)
6145 {
6146         int freed_spc = 0;
6147         struct sctp_tmit_chunk *chk, *nchk;
6148
6149         SCTP_TCB_LOCK_ASSERT(stcb);
6150         if ((asoc->prsctp_supported) &&
6151             (asoc->sent_queue_cnt_removeable > 0)) {
6152                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6153                         /*
6154                          * Look for chunks marked with the PR_SCTP flag AND
6155                          * the buffer space flag. If the one being sent is
6156                          * equal or greater priority then purge the old one
6157                          * and free some space.
6158                          */
6159                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6160                                 /*
6161                                  * This one is PR-SCTP AND buffer space
6162                                  * limited type
6163                                  */
6164                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6165                                         /*
6166                                          * Lower numbers equates to higher
6167                                          * priority so if the one we are
6168                                          * looking at has a larger or equal
6169                                          * priority we want to drop the data
6170                                          * and NOT retransmit it.
6171                                          */
6172                                         if (chk->data) {
6173                                                 /*
6174                                                  * We release the book_size
6175                                                  * if the mbuf is here
6176                                                  */
6177                                                 int ret_spc;
6178                                                 uint8_t sent;
6179
6180                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6181                                                         sent = 1;
6182                                                 else
6183                                                         sent = 0;
6184                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6185                                                     sent,
6186                                                     SCTP_SO_LOCKED);
6187                                                 freed_spc += ret_spc;
6188                                                 if (freed_spc >= dataout) {
6189                                                         return;
6190                                                 }
6191                                         }       /* if chunk was present */
6192                                 }       /* if of sufficent priority */
6193                         }       /* if chunk has enabled */
6194                 }               /* tailqforeach */
6195
6196                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6197                         /* Here we must move to the sent queue and mark */
6198                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6199                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6200                                         if (chk->data) {
6201                                                 /*
6202                                                  * We release the book_size
6203                                                  * if the mbuf is here
6204                                                  */
6205                                                 int ret_spc;
6206
6207                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6208                                                     0, SCTP_SO_LOCKED);
6209
6210                                                 freed_spc += ret_spc;
6211                                                 if (freed_spc >= dataout) {
6212                                                         return;
6213                                                 }
6214                                         }       /* end if chk->data */
6215                                 }       /* end if right class */
6216                         }       /* end if chk pr-sctp */
6217                 }               /* tailqforeachsafe (chk) */
6218         }                       /* if enabled in asoc */
6219 }
6220
6221 int
6222 sctp_get_frag_point(struct sctp_tcb *stcb,
6223     struct sctp_association *asoc)
6224 {
6225         int siz, ovh;
6226
6227         /*
6228          * For endpoints that have both v6 and v4 addresses we must reserve
6229          * room for the ipv6 header, for those that are only dealing with V4
6230          * we use a larger frag point.
6231          */
6232         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6233                 ovh = SCTP_MED_OVERHEAD;
6234         } else {
6235                 ovh = SCTP_MED_V4_OVERHEAD;
6236         }
6237
6238         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6239                 siz = asoc->smallest_mtu - ovh;
6240         else
6241                 siz = (stcb->asoc.sctp_frag_point - ovh);
6242         /*
6243          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6244          */
6245         /* A data chunk MUST fit in a cluster */
6246         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6247         /* } */
6248
6249         /* adjust for an AUTH chunk if DATA requires auth */
6250         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6251                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6252
6253         if (siz % 4) {
6254                 /* make it an even word boundary please */
6255                 siz -= (siz % 4);
6256         }
6257         return (siz);
6258 }
6259
6260 static void
6261 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6262 {
6263         /*
6264          * We assume that the user wants PR_SCTP_TTL if the user provides a
6265          * positive lifetime but does not specify any PR_SCTP policy.
6266          */
6267         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6268                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6269         } else if (sp->timetolive > 0) {
6270                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6271                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6272         } else {
6273                 return;
6274         }
6275         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6276         case CHUNK_FLAGS_PR_SCTP_BUF:
6277                 /*
6278                  * Time to live is a priority stored in tv_sec when doing
6279                  * the buffer drop thing.
6280                  */
6281                 sp->ts.tv_sec = sp->timetolive;
6282                 sp->ts.tv_usec = 0;
6283                 break;
6284         case CHUNK_FLAGS_PR_SCTP_TTL:
6285                 {
6286                         struct timeval tv;
6287
6288                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6289                         tv.tv_sec = sp->timetolive / 1000;
6290                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6291                         /*
6292                          * TODO sctp_constants.h needs alternative time
6293                          * macros when _KERNEL is undefined.
6294                          */
6295                         timevaladd(&sp->ts, &tv);
6296                 }
6297                 break;
6298         case CHUNK_FLAGS_PR_SCTP_RTX:
6299                 /*
6300                  * Time to live is a the number or retransmissions stored in
6301                  * tv_sec.
6302                  */
6303                 sp->ts.tv_sec = sp->timetolive;
6304                 sp->ts.tv_usec = 0;
6305                 break;
6306         default:
6307                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6308                     "Unknown PR_SCTP policy %u.\n",
6309                     PR_SCTP_POLICY(sp->sinfo_flags));
6310                 break;
6311         }
6312 }
6313
6314 static int
6315 sctp_msg_append(struct sctp_tcb *stcb,
6316     struct sctp_nets *net,
6317     struct mbuf *m,
6318     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6319 {
6320         int error = 0;
6321         struct mbuf *at;
6322         struct sctp_stream_queue_pending *sp = NULL;
6323         struct sctp_stream_out *strm;
6324
6325         /*
6326          * Given an mbuf chain, put it into the association send queue and
6327          * place it on the wheel
6328          */
6329         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6330                 /* Invalid stream number */
6331                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6332                 error = EINVAL;
6333                 goto out_now;
6334         }
6335         if ((stcb->asoc.stream_locked) &&
6336             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6337                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6338                 error = EINVAL;
6339                 goto out_now;
6340         }
6341         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6342         /* Now can we send this? */
6343         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6344             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6345             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6346             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6347                 /* got data while shutting down */
6348                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6349                 error = ECONNRESET;
6350                 goto out_now;
6351         }
6352         sctp_alloc_a_strmoq(stcb, sp);
6353         if (sp == NULL) {
6354                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6355                 error = ENOMEM;
6356                 goto out_now;
6357         }
6358         sp->sinfo_flags = srcv->sinfo_flags;
6359         sp->timetolive = srcv->sinfo_timetolive;
6360         sp->ppid = srcv->sinfo_ppid;
6361         sp->context = srcv->sinfo_context;
6362         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6363                 sp->net = net;
6364                 atomic_add_int(&sp->net->ref_count, 1);
6365         } else {
6366                 sp->net = NULL;
6367         }
6368         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6369         sp->stream = srcv->sinfo_stream;
6370         sp->msg_is_complete = 1;
6371         sp->sender_all_done = 1;
6372         sp->some_taken = 0;
6373         sp->data = m;
6374         sp->tail_mbuf = NULL;
6375         sctp_set_prsctp_policy(sp);
6376         /*
6377          * We could in theory (for sendall) sifa the length in, but we would
6378          * still have to hunt through the chain since we need to setup the
6379          * tail_mbuf
6380          */
6381         sp->length = 0;
6382         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6383                 if (SCTP_BUF_NEXT(at) == NULL)
6384                         sp->tail_mbuf = at;
6385                 sp->length += SCTP_BUF_LEN(at);
6386         }
6387         if (srcv->sinfo_keynumber_valid) {
6388                 sp->auth_keyid = srcv->sinfo_keynumber;
6389         } else {
6390                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6391         }
6392         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6393                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6394                 sp->holds_key_ref = 1;
6395         }
6396         if (hold_stcb_lock == 0) {
6397                 SCTP_TCB_SEND_LOCK(stcb);
6398         }
6399         sctp_snd_sb_alloc(stcb, sp->length);
6400         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6401         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6402         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6403         m = NULL;
6404         if (hold_stcb_lock == 0) {
6405                 SCTP_TCB_SEND_UNLOCK(stcb);
6406         }
6407 out_now:
6408         if (m) {
6409                 sctp_m_freem(m);
6410         }
6411         return (error);
6412 }
6413
6414
6415 static struct mbuf *
6416 sctp_copy_mbufchain(struct mbuf *clonechain,
6417     struct mbuf *outchain,
6418     struct mbuf **endofchain,
6419     int can_take_mbuf,
6420     int sizeofcpy,
6421     uint8_t copy_by_ref)
6422 {
6423         struct mbuf *m;
6424         struct mbuf *appendchain;
6425         caddr_t cp;
6426         int len;
6427
6428         if (endofchain == NULL) {
6429                 /* error */
6430 error_out:
6431                 if (outchain)
6432                         sctp_m_freem(outchain);
6433                 return (NULL);
6434         }
6435         if (can_take_mbuf) {
6436                 appendchain = clonechain;
6437         } else {
6438                 if (!copy_by_ref &&
6439                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6440                     ) {
6441                         /* Its not in a cluster */
6442                         if (*endofchain == NULL) {
6443                                 /* lets get a mbuf cluster */
6444                                 if (outchain == NULL) {
6445                                         /* This is the general case */
6446                         new_mbuf:
6447                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6448                                         if (outchain == NULL) {
6449                                                 goto error_out;
6450                                         }
6451                                         SCTP_BUF_LEN(outchain) = 0;
6452                                         *endofchain = outchain;
6453                                         /* get the prepend space */
6454                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6455                                 } else {
6456                                         /*
6457                                          * We really should not get a NULL
6458                                          * in endofchain
6459                                          */
6460                                         /* find end */
6461                                         m = outchain;
6462                                         while (m) {
6463                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6464                                                         *endofchain = m;
6465                                                         break;
6466                                                 }
6467                                                 m = SCTP_BUF_NEXT(m);
6468                                         }
6469                                         /* sanity */
6470                                         if (*endofchain == NULL) {
6471                                                 /*
6472                                                  * huh, TSNH XXX maybe we
6473                                                  * should panic
6474                                                  */
6475                                                 sctp_m_freem(outchain);
6476                                                 goto new_mbuf;
6477                                         }
6478                                 }
6479                                 /* get the new end of length */
6480                                 len = M_TRAILINGSPACE(*endofchain);
6481                         } else {
6482                                 /* how much is left at the end? */
6483                                 len = M_TRAILINGSPACE(*endofchain);
6484                         }
6485                         /* Find the end of the data, for appending */
6486                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6487
6488                         /* Now lets copy it out */
6489                         if (len >= sizeofcpy) {
6490                                 /* It all fits, copy it in */
6491                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6492                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6493                         } else {
6494                                 /* fill up the end of the chain */
6495                                 if (len > 0) {
6496                                         m_copydata(clonechain, 0, len, cp);
6497                                         SCTP_BUF_LEN((*endofchain)) += len;
6498                                         /* now we need another one */
6499                                         sizeofcpy -= len;
6500                                 }
6501                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6502                                 if (m == NULL) {
6503                                         /* We failed */
6504                                         goto error_out;
6505                                 }
6506                                 SCTP_BUF_NEXT((*endofchain)) = m;
6507                                 *endofchain = m;
6508                                 cp = mtod((*endofchain), caddr_t);
6509                                 m_copydata(clonechain, len, sizeofcpy, cp);
6510                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6511                         }
6512                         return (outchain);
6513                 } else {
6514                         /* copy the old fashion way */
6515                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6516 #ifdef SCTP_MBUF_LOGGING
6517                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6518                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6519                         }
6520 #endif
6521                 }
6522         }
6523         if (appendchain == NULL) {
6524                 /* error */
6525                 if (outchain)
6526                         sctp_m_freem(outchain);
6527                 return (NULL);
6528         }
6529         if (outchain) {
6530                 /* tack on to the end */
6531                 if (*endofchain != NULL) {
6532                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6533                 } else {
6534                         m = outchain;
6535                         while (m) {
6536                                 if (SCTP_BUF_NEXT(m) == NULL) {
6537                                         SCTP_BUF_NEXT(m) = appendchain;
6538                                         break;
6539                                 }
6540                                 m = SCTP_BUF_NEXT(m);
6541                         }
6542                 }
6543                 /*
6544                  * save off the end and update the end-chain postion
6545                  */
6546                 m = appendchain;
6547                 while (m) {
6548                         if (SCTP_BUF_NEXT(m) == NULL) {
6549                                 *endofchain = m;
6550                                 break;
6551                         }
6552                         m = SCTP_BUF_NEXT(m);
6553                 }
6554                 return (outchain);
6555         } else {
6556                 /* save off the end and update the end-chain postion */
6557                 m = appendchain;
6558                 while (m) {
6559                         if (SCTP_BUF_NEXT(m) == NULL) {
6560                                 *endofchain = m;
6561                                 break;
6562                         }
6563                         m = SCTP_BUF_NEXT(m);
6564                 }
6565                 return (appendchain);
6566         }
6567 }
6568
6569 static int
6570 sctp_med_chunk_output(struct sctp_inpcb *inp,
6571     struct sctp_tcb *stcb,
6572     struct sctp_association *asoc,
6573     int *num_out,
6574     int *reason_code,
6575     int control_only, int from_where,
6576     struct timeval *now, int *now_filled, int frag_point, int so_locked
6577 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6578     SCTP_UNUSED
6579 #endif
6580 );
6581
6582 static void
6583 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6584     uint32_t val SCTP_UNUSED)
6585 {
6586         struct sctp_copy_all *ca;
6587         struct mbuf *m;
6588         int ret = 0;
6589         int added_control = 0;
6590         int un_sent, do_chunk_output = 1;
6591         struct sctp_association *asoc;
6592         struct sctp_nets *net;
6593
6594         ca = (struct sctp_copy_all *)ptr;
6595         if (ca->m == NULL) {
6596                 return;
6597         }
6598         if (ca->inp != inp) {
6599                 /* TSNH */
6600                 return;
6601         }
6602         if (ca->sndlen > 0) {
6603                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6604                 if (m == NULL) {
6605                         /* can't copy so we are done */
6606                         ca->cnt_failed++;
6607                         return;
6608                 }
6609 #ifdef SCTP_MBUF_LOGGING
6610                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6611                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6612                 }
6613 #endif
6614         } else {
6615                 m = NULL;
6616         }
6617         SCTP_TCB_LOCK_ASSERT(stcb);
6618         if (stcb->asoc.alternate) {
6619                 net = stcb->asoc.alternate;
6620         } else {
6621                 net = stcb->asoc.primary_destination;
6622         }
6623         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6624                 /* Abort this assoc with m as the user defined reason */
6625                 if (m != NULL) {
6626                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6627                 } else {
6628                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6629                             0, M_NOWAIT, 1, MT_DATA);
6630                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6631                 }
6632                 if (m != NULL) {
6633                         struct sctp_paramhdr *ph;
6634
6635                         ph = mtod(m, struct sctp_paramhdr *);
6636                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6637                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6638                 }
6639                 /*
6640                  * We add one here to keep the assoc from dis-appearing on
6641                  * us.
6642                  */
6643                 atomic_add_int(&stcb->asoc.refcnt, 1);
6644                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6645                 /*
6646                  * sctp_abort_an_association calls sctp_free_asoc() free
6647                  * association will NOT free it since we incremented the
6648                  * refcnt .. we do this to prevent it being freed and things
6649                  * getting tricky since we could end up (from free_asoc)
6650                  * calling inpcb_free which would get a recursive lock call
6651                  * to the iterator lock.. But as a consequence of that the
6652                  * stcb will return to us un-locked.. since free_asoc
6653                  * returns with either no TCB or the TCB unlocked, we must
6654                  * relock.. to unlock in the iterator timer :-0
6655                  */
6656                 SCTP_TCB_LOCK(stcb);
6657                 atomic_add_int(&stcb->asoc.refcnt, -1);
6658                 goto no_chunk_output;
6659         } else {
6660                 if (m) {
6661                         ret = sctp_msg_append(stcb, net, m,
6662                             &ca->sndrcv, 1);
6663                 }
6664                 asoc = &stcb->asoc;
6665                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6666                         /* shutdown this assoc */
6667                         int cnt;
6668
6669                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6670
6671                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6672                             TAILQ_EMPTY(&asoc->sent_queue) &&
6673                             (cnt == 0)) {
6674                                 if (asoc->locked_on_sending) {
6675                                         goto abort_anyway;
6676                                 }
6677                                 /*
6678                                  * there is nothing queued to send, so I'm
6679                                  * done...
6680                                  */
6681                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6682                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6683                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6684                                         /*
6685                                          * only send SHUTDOWN the first time
6686                                          * through
6687                                          */
6688                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6689                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6690                                         }
6691                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6692                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6693                                         sctp_stop_timers_for_shutdown(stcb);
6694                                         sctp_send_shutdown(stcb, net);
6695                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6696                                             net);
6697                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6698                                             asoc->primary_destination);
6699                                         added_control = 1;
6700                                         do_chunk_output = 0;
6701                                 }
6702                         } else {
6703                                 /*
6704                                  * we still got (or just got) data to send,
6705                                  * so set SHUTDOWN_PENDING
6706                                  */
6707                                 /*
6708                                  * XXX sockets draft says that SCTP_EOF
6709                                  * should be sent with no data.  currently,
6710                                  * we will allow user data to be sent first
6711                                  * and move to SHUTDOWN-PENDING
6712                                  */
6713                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6714                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6715                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6716                                         if (asoc->locked_on_sending) {
6717                                                 /*
6718                                                  * Locked to send out the
6719                                                  * data
6720                                                  */
6721                                                 struct sctp_stream_queue_pending *sp;
6722
6723                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6724                                                 if (sp) {
6725                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6726                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6727                                                 }
6728                                         }
6729                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6730                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6731                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6732                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6733                                                 struct mbuf *op_err;
6734                                                 char msg[SCTP_DIAG_INFO_LEN];
6735
6736                                 abort_anyway:
6737                                                 snprintf(msg, sizeof(msg),
6738                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6739                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6740                                                     msg);
6741                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6742                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6743                                                     op_err, SCTP_SO_NOT_LOCKED);
6744                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6745                                                 goto no_chunk_output;
6746                                         }
6747                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6748                                             asoc->primary_destination);
6749                                 }
6750                         }
6751
6752                 }
6753         }
6754         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6755             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6756
6757         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6758             (stcb->asoc.total_flight > 0) &&
6759             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6760                 do_chunk_output = 0;
6761         }
6762         if (do_chunk_output)
6763                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6764         else if (added_control) {
6765                 int num_out, reason, now_filled = 0;
6766                 struct timeval now;
6767                 int frag_point;
6768
6769                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6770                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6771                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6772         }
6773 no_chunk_output:
6774         if (ret) {
6775                 ca->cnt_failed++;
6776         } else {
6777                 ca->cnt_sent++;
6778         }
6779 }
6780
6781 static void
6782 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6783 {
6784         struct sctp_copy_all *ca;
6785
6786         ca = (struct sctp_copy_all *)ptr;
6787         /*
6788          * Do a notify here? Kacheong suggests that the notify be done at
6789          * the send time.. so you would push up a notification if any send
6790          * failed. Don't know if this is feasable since the only failures we
6791          * have is "memory" related and if you cannot get an mbuf to send
6792          * the data you surely can't get an mbuf to send up to notify the
6793          * user you can't send the data :->
6794          */
6795
6796         /* now free everything */
6797         sctp_m_freem(ca->m);
6798         SCTP_FREE(ca, SCTP_M_COPYAL);
6799 }
6800
6801 static struct mbuf *
6802 sctp_copy_out_all(struct uio *uio, int len)
6803 {
6804         struct mbuf *ret, *at;
6805         int left, willcpy, cancpy, error;
6806
6807         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6808         if (ret == NULL) {
6809                 /* TSNH */
6810                 return (NULL);
6811         }
6812         left = len;
6813         SCTP_BUF_LEN(ret) = 0;
6814         /* save space for the data chunk header */
6815         cancpy = M_TRAILINGSPACE(ret);
6816         willcpy = min(cancpy, left);
6817         at = ret;
6818         while (left > 0) {
6819                 /* Align data to the end */
6820                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6821                 if (error) {
6822         err_out_now:
6823                         sctp_m_freem(at);
6824                         return (NULL);
6825                 }
6826                 SCTP_BUF_LEN(at) = willcpy;
6827                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6828                 left -= willcpy;
6829                 if (left > 0) {
6830                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6831                         if (SCTP_BUF_NEXT(at) == NULL) {
6832                                 goto err_out_now;
6833                         }
6834                         at = SCTP_BUF_NEXT(at);
6835                         SCTP_BUF_LEN(at) = 0;
6836                         cancpy = M_TRAILINGSPACE(at);
6837                         willcpy = min(cancpy, left);
6838                 }
6839         }
6840         return (ret);
6841 }
6842
6843 static int
6844 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6845     struct sctp_sndrcvinfo *srcv)
6846 {
6847         int ret;
6848         struct sctp_copy_all *ca;
6849
6850         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6851             SCTP_M_COPYAL);
6852         if (ca == NULL) {
6853                 sctp_m_freem(m);
6854                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6855                 return (ENOMEM);
6856         }
6857         memset(ca, 0, sizeof(struct sctp_copy_all));
6858
6859         ca->inp = inp;
6860         if (srcv) {
6861                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6862         }
6863         /*
6864          * take off the sendall flag, it would be bad if we failed to do
6865          * this :-0
6866          */
6867         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6868         /* get length and mbuf chain */
6869         if (uio) {
6870                 ca->sndlen = uio->uio_resid;
6871                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6872                 if (ca->m == NULL) {
6873                         SCTP_FREE(ca, SCTP_M_COPYAL);
6874                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6875                         return (ENOMEM);
6876                 }
6877         } else {
6878                 /* Gather the length of the send */
6879                 struct mbuf *mat;
6880
6881                 ca->sndlen = 0;
6882                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6883                         ca->sndlen += SCTP_BUF_LEN(mat);
6884                 }
6885         }
6886         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6887             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6888             SCTP_ASOC_ANY_STATE,
6889             (void *)ca, 0,
6890             sctp_sendall_completes, inp, 1);
6891         if (ret) {
6892                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6893                 SCTP_FREE(ca, SCTP_M_COPYAL);
6894                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6895                 return (EFAULT);
6896         }
6897         return (0);
6898 }
6899
6900
6901 void
6902 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6903 {
6904         struct sctp_tmit_chunk *chk, *nchk;
6905
6906         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6907                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6908                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6909                         if (chk->data) {
6910                                 sctp_m_freem(chk->data);
6911                                 chk->data = NULL;
6912                         }
6913                         asoc->ctrl_queue_cnt--;
6914                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6915                 }
6916         }
6917 }
6918
6919 void
6920 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6921 {
6922         struct sctp_association *asoc;
6923         struct sctp_tmit_chunk *chk, *nchk;
6924         struct sctp_asconf_chunk *acp;
6925
6926         asoc = &stcb->asoc;
6927         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6928                 /* find SCTP_ASCONF chunk in queue */
6929                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6930                         if (chk->data) {
6931                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6932                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6933                                         /* Not Acked yet */
6934                                         break;
6935                                 }
6936                         }
6937                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6938                         if (chk->data) {
6939                                 sctp_m_freem(chk->data);
6940                                 chk->data = NULL;
6941                         }
6942                         asoc->ctrl_queue_cnt--;
6943                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6944                 }
6945         }
6946 }
6947
6948
6949 static void
6950 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6951     struct sctp_association *asoc,
6952     struct sctp_tmit_chunk **data_list,
6953     int bundle_at,
6954     struct sctp_nets *net)
6955 {
6956         int i;
6957         struct sctp_tmit_chunk *tp1;
6958
6959         for (i = 0; i < bundle_at; i++) {
6960                 /* off of the send queue */
6961                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6962                 asoc->send_queue_cnt--;
6963                 if (i > 0) {
6964                         /*
6965                          * Any chunk NOT 0 you zap the time chunk 0 gets
6966                          * zapped or set based on if a RTO measurment is
6967                          * needed.
6968                          */
6969                         data_list[i]->do_rtt = 0;
6970                 }
6971                 /* record time */
6972                 data_list[i]->sent_rcv_time = net->last_sent_time;
6973                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6974                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6975                 if (data_list[i]->whoTo == NULL) {
6976                         data_list[i]->whoTo = net;
6977                         atomic_add_int(&net->ref_count, 1);
6978                 }
6979                 /* on to the sent queue */
6980                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6981                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6982                         struct sctp_tmit_chunk *tpp;
6983
6984                         /* need to move back */
6985         back_up_more:
6986                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6987                         if (tpp == NULL) {
6988                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6989                                 goto all_done;
6990                         }
6991                         tp1 = tpp;
6992                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6993                                 goto back_up_more;
6994                         }
6995                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6996                 } else {
6997                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6998                             data_list[i],
6999                             sctp_next);
7000                 }
7001 all_done:
7002                 /* This does not lower until the cum-ack passes it */
7003                 asoc->sent_queue_cnt++;
7004                 if ((asoc->peers_rwnd <= 0) &&
7005                     (asoc->total_flight == 0) &&
7006                     (bundle_at == 1)) {
7007                         /* Mark the chunk as being a window probe */
7008                         SCTP_STAT_INCR(sctps_windowprobed);
7009                 }
7010 #ifdef SCTP_AUDITING_ENABLED
7011                 sctp_audit_log(0xC2, 3);
7012 #endif
7013                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7014                 data_list[i]->snd_count = 1;
7015                 data_list[i]->rec.data.chunk_was_revoked = 0;
7016                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7017                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7018                             data_list[i]->whoTo->flight_size,
7019                             data_list[i]->book_size,
7020                             (uintptr_t) data_list[i]->whoTo,
7021                             data_list[i]->rec.data.TSN_seq);
7022                 }
7023                 sctp_flight_size_increase(data_list[i]);
7024                 sctp_total_flight_increase(stcb, data_list[i]);
7025                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7026                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7027                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7028                 }
7029                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7030                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7031                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7032                         /* SWS sender side engages */
7033                         asoc->peers_rwnd = 0;
7034                 }
7035         }
7036         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7037                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7038         }
7039 }
7040
7041 static void
7042 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7043 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7044     SCTP_UNUSED
7045 #endif
7046 )
7047 {
7048         struct sctp_tmit_chunk *chk, *nchk;
7049
7050         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7051                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7052                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7053                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7054                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7055                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7056                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7057                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7058                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7059                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7060                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7061                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7062                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7063                         /* Stray chunks must be cleaned up */
7064         clean_up_anyway:
7065                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7066                         if (chk->data) {
7067                                 sctp_m_freem(chk->data);
7068                                 chk->data = NULL;
7069                         }
7070                         asoc->ctrl_queue_cnt--;
7071                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7072                                 asoc->fwd_tsn_cnt--;
7073                         sctp_free_a_chunk(stcb, chk, so_locked);
7074                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7075                         /* special handling, we must look into the param */
7076                         if (chk != asoc->str_reset) {
7077                                 goto clean_up_anyway;
7078                         }
7079                 }
7080         }
7081 }
7082
7083
7084 static int
7085 sctp_can_we_split_this(struct sctp_tcb *stcb,
7086     uint32_t length,
7087     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7088 {
7089         /*
7090          * Make a decision on if I should split a msg into multiple parts.
7091          * This is only asked of incomplete messages.
7092          */
7093         if (eeor_on) {
7094                 /*
7095                  * If we are doing EEOR we need to always send it if its the
7096                  * entire thing, since it might be all the guy is putting in
7097                  * the hopper.
7098                  */
7099                 if (goal_mtu >= length) {
7100                         /*-
7101                          * If we have data outstanding,
7102                          * we get another chance when the sack
7103                          * arrives to transmit - wait for more data
7104                          */
7105                         if (stcb->asoc.total_flight == 0) {
7106                                 /*
7107                                  * If nothing is in flight, we zero the
7108                                  * packet counter.
7109                                  */
7110                                 return (length);
7111                         }
7112                         return (0);
7113
7114                 } else {
7115                         /* You can fill the rest */
7116                         return (goal_mtu);
7117                 }
7118         }
7119         /*-
7120          * For those strange folk that make the send buffer
7121          * smaller than our fragmentation point, we can't
7122          * get a full msg in so we have to allow splitting.
7123          */
7124         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7125                 return (length);
7126         }
7127         if ((length <= goal_mtu) ||
7128             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7129                 /* Sub-optimial residual don't split in non-eeor mode. */
7130                 return (0);
7131         }
7132         /*
7133          * If we reach here length is larger than the goal_mtu. Do we wish
7134          * to split it for the sake of packet putting together?
7135          */
7136         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7137                 /* Its ok to split it */
7138                 return (min(goal_mtu, frag_point));
7139         }
7140         /* Nope, can't split */
7141         return (0);
7142
7143 }
7144
7145 static uint32_t
7146 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7147     struct sctp_stream_out *strq,
7148     uint32_t goal_mtu,
7149     uint32_t frag_point,
7150     int *locked,
7151     int *giveup,
7152     int eeor_mode,
7153     int *bail,
7154     int so_locked
7155 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7156     SCTP_UNUSED
7157 #endif
7158 )
7159 {
7160         /* Move from the stream to the send_queue keeping track of the total */
7161         struct sctp_association *asoc;
7162         struct sctp_stream_queue_pending *sp;
7163         struct sctp_tmit_chunk *chk;
7164         struct sctp_data_chunk *dchkh;
7165         uint32_t to_move, length;
7166         uint8_t rcv_flags = 0;
7167         uint8_t some_taken;
7168         uint8_t send_lock_up = 0;
7169
7170         SCTP_TCB_LOCK_ASSERT(stcb);
7171         asoc = &stcb->asoc;
7172 one_more_time:
7173         /* sa_ignore FREED_MEMORY */
7174         sp = TAILQ_FIRST(&strq->outqueue);
7175         if (sp == NULL) {
7176                 *locked = 0;
7177                 if (send_lock_up == 0) {
7178                         SCTP_TCB_SEND_LOCK(stcb);
7179                         send_lock_up = 1;
7180                 }
7181                 sp = TAILQ_FIRST(&strq->outqueue);
7182                 if (sp) {
7183                         goto one_more_time;
7184                 }
7185                 if (strq->last_msg_incomplete) {
7186                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7187                             strq->stream_no,
7188                             strq->last_msg_incomplete);
7189                         strq->last_msg_incomplete = 0;
7190                 }
7191                 to_move = 0;
7192                 if (send_lock_up) {
7193                         SCTP_TCB_SEND_UNLOCK(stcb);
7194                         send_lock_up = 0;
7195                 }
7196                 goto out_of;
7197         }
7198         if ((sp->msg_is_complete) && (sp->length == 0)) {
7199                 if (sp->sender_all_done) {
7200                         /*
7201                          * We are doing differed cleanup. Last time through
7202                          * when we took all the data the sender_all_done was
7203                          * not set.
7204                          */
7205                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7206                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7207                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7208                                     sp->sender_all_done,
7209                                     sp->length,
7210                                     sp->msg_is_complete,
7211                                     sp->put_last_out,
7212                                     send_lock_up);
7213                         }
7214                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7215                                 SCTP_TCB_SEND_LOCK(stcb);
7216                                 send_lock_up = 1;
7217                         }
7218                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7219                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7220                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7221                             (strq->chunks_on_queues == 0) &&
7222                             TAILQ_EMPTY(&strq->outqueue)) {
7223                                 stcb->asoc.trigger_reset = 1;
7224                         }
7225                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7226                         if (sp->net) {
7227                                 sctp_free_remote_addr(sp->net);
7228                                 sp->net = NULL;
7229                         }
7230                         if (sp->data) {
7231                                 sctp_m_freem(sp->data);
7232                                 sp->data = NULL;
7233                         }
7234                         sctp_free_a_strmoq(stcb, sp, so_locked);
7235                         /* we can't be locked to it */
7236                         *locked = 0;
7237                         stcb->asoc.locked_on_sending = NULL;
7238                         if (send_lock_up) {
7239                                 SCTP_TCB_SEND_UNLOCK(stcb);
7240                                 send_lock_up = 0;
7241                         }
7242                         /* back to get the next msg */
7243                         goto one_more_time;
7244                 } else {
7245                         /*
7246                          * sender just finished this but still holds a
7247                          * reference
7248                          */
7249                         *locked = 1;
7250                         *giveup = 1;
7251                         to_move = 0;
7252                         goto out_of;
7253                 }
7254         } else {
7255                 /* is there some to get */
7256                 if (sp->length == 0) {
7257                         /* no */
7258                         *locked = 1;
7259                         *giveup = 1;
7260                         to_move = 0;
7261                         goto out_of;
7262                 } else if (sp->discard_rest) {
7263                         if (send_lock_up == 0) {
7264                                 SCTP_TCB_SEND_LOCK(stcb);
7265                                 send_lock_up = 1;
7266                         }
7267                         /* Whack down the size */
7268                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7269                         if ((stcb->sctp_socket != NULL) &&
7270                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7271                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7272                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7273                         }
7274                         if (sp->data) {
7275                                 sctp_m_freem(sp->data);
7276                                 sp->data = NULL;
7277                                 sp->tail_mbuf = NULL;
7278                         }
7279                         sp->length = 0;
7280                         sp->some_taken = 1;
7281                         *locked = 1;
7282                         *giveup = 1;
7283                         to_move = 0;
7284                         goto out_of;
7285                 }
7286         }
7287         some_taken = sp->some_taken;
7288 re_look:
7289         length = sp->length;
7290         if (sp->msg_is_complete) {
7291                 /* The message is complete */
7292                 to_move = min(length, frag_point);
7293                 if (to_move == length) {
7294                         /* All of it fits in the MTU */
7295                         if (sp->some_taken) {
7296                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7297                                 sp->put_last_out = 1;
7298                         } else {
7299                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7300                                 sp->put_last_out = 1;
7301                         }
7302                 } else {
7303                         /* Not all of it fits, we fragment */
7304                         if (sp->some_taken == 0) {
7305                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7306                         }
7307                         sp->some_taken = 1;
7308                 }
7309         } else {
7310                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7311                 if (to_move) {
7312                         /*-
7313                          * We use a snapshot of length in case it
7314                          * is expanding during the compare.
7315                          */
7316                         uint32_t llen;
7317
7318                         llen = length;
7319                         if (to_move >= llen) {
7320                                 to_move = llen;
7321                                 if (send_lock_up == 0) {
7322                                         /*-
7323                                          * We are taking all of an incomplete msg
7324                                          * thus we need a send lock.
7325                                          */
7326                                         SCTP_TCB_SEND_LOCK(stcb);
7327                                         send_lock_up = 1;
7328                                         if (sp->msg_is_complete) {
7329                                                 /*
7330                                                  * the sender finished the
7331                                                  * msg
7332                                                  */
7333                                                 goto re_look;
7334                                         }
7335                                 }
7336                         }
7337                         if (sp->some_taken == 0) {
7338                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7339                                 sp->some_taken = 1;
7340                         }
7341                 } else {
7342                         /* Nothing to take. */
7343                         if (sp->some_taken) {
7344                                 *locked = 1;
7345                         }
7346                         *giveup = 1;
7347                         to_move = 0;
7348                         goto out_of;
7349                 }
7350         }
7351
7352         /* If we reach here, we can copy out a chunk */
7353         sctp_alloc_a_chunk(stcb, chk);
7354         if (chk == NULL) {
7355                 /* No chunk memory */
7356                 *giveup = 1;
7357                 to_move = 0;
7358                 goto out_of;
7359         }
7360         /*
7361          * Setup for unordered if needed by looking at the user sent info
7362          * flags.
7363          */
7364         if (sp->sinfo_flags & SCTP_UNORDERED) {
7365                 rcv_flags |= SCTP_DATA_UNORDERED;
7366         }
7367         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7368             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7369                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7370         }
7371         /* clear out the chunk before setting up */
7372         memset(chk, 0, sizeof(*chk));
7373         chk->rec.data.rcv_flags = rcv_flags;
7374
7375         if (to_move >= length) {
7376                 /* we think we can steal the whole thing */
7377                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7378                         SCTP_TCB_SEND_LOCK(stcb);
7379                         send_lock_up = 1;
7380                 }
7381                 if (to_move < sp->length) {
7382                         /* bail, it changed */
7383                         goto dont_do_it;
7384                 }
7385                 chk->data = sp->data;
7386                 chk->last_mbuf = sp->tail_mbuf;
7387                 /* register the stealing */
7388                 sp->data = sp->tail_mbuf = NULL;
7389         } else {
7390                 struct mbuf *m;
7391
7392 dont_do_it:
7393                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7394                 chk->last_mbuf = NULL;
7395                 if (chk->data == NULL) {
7396                         sp->some_taken = some_taken;
7397                         sctp_free_a_chunk(stcb, chk, so_locked);
7398                         *bail = 1;
7399                         to_move = 0;
7400                         goto out_of;
7401                 }
7402 #ifdef SCTP_MBUF_LOGGING
7403                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7404                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7405                 }
7406 #endif
7407                 /* Pull off the data */
7408                 m_adj(sp->data, to_move);
7409                 /* Now lets work our way down and compact it */
7410                 m = sp->data;
7411                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7412                         sp->data = SCTP_BUF_NEXT(m);
7413                         SCTP_BUF_NEXT(m) = NULL;
7414                         if (sp->tail_mbuf == m) {
7415                                 /*-
7416                                  * Freeing tail? TSNH since
7417                                  * we supposedly were taking less
7418                                  * than the sp->length.
7419                                  */
7420 #ifdef INVARIANTS
7421                                 panic("Huh, freing tail? - TSNH");
7422 #else
7423                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7424                                 sp->tail_mbuf = sp->data = NULL;
7425                                 sp->length = 0;
7426 #endif
7427
7428                         }
7429                         sctp_m_free(m);
7430                         m = sp->data;
7431                 }
7432         }
7433         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7434                 chk->copy_by_ref = 1;
7435         } else {
7436                 chk->copy_by_ref = 0;
7437         }
7438         /*
7439          * get last_mbuf and counts of mb useage This is ugly but hopefully
7440          * its only one mbuf.
7441          */
7442         if (chk->last_mbuf == NULL) {
7443                 chk->last_mbuf = chk->data;
7444                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7445                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7446                 }
7447         }
7448         if (to_move > length) {
7449                 /*- This should not happen either
7450                  * since we always lower to_move to the size
7451                  * of sp->length if its larger.
7452                  */
7453 #ifdef INVARIANTS
7454                 panic("Huh, how can to_move be larger?");
7455 #else
7456                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7457                 sp->length = 0;
7458 #endif
7459         } else {
7460                 atomic_subtract_int(&sp->length, to_move);
7461         }
7462         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7463                 /* Not enough room for a chunk header, get some */
7464                 struct mbuf *m;
7465
7466                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7467                 if (m == NULL) {
7468                         /*
7469                          * we're in trouble here. _PREPEND below will free
7470                          * all the data if there is no leading space, so we
7471                          * must put the data back and restore.
7472                          */
7473                         if (send_lock_up == 0) {
7474                                 SCTP_TCB_SEND_LOCK(stcb);
7475                                 send_lock_up = 1;
7476                         }
7477                         if (sp->data == NULL) {
7478                                 /* unsteal the data */
7479                                 sp->data = chk->data;
7480                                 sp->tail_mbuf = chk->last_mbuf;
7481                         } else {
7482                                 struct mbuf *m_tmp;
7483
7484                                 /* reassemble the data */
7485                                 m_tmp = sp->data;
7486                                 sp->data = chk->data;
7487                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7488                         }
7489                         sp->some_taken = some_taken;
7490                         atomic_add_int(&sp->length, to_move);
7491                         chk->data = NULL;
7492                         *bail = 1;
7493                         sctp_free_a_chunk(stcb, chk, so_locked);
7494                         to_move = 0;
7495                         goto out_of;
7496                 } else {
7497                         SCTP_BUF_LEN(m) = 0;
7498                         SCTP_BUF_NEXT(m) = chk->data;
7499                         chk->data = m;
7500                         M_ALIGN(chk->data, 4);
7501                 }
7502         }
7503         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7504         if (chk->data == NULL) {
7505                 /* HELP, TSNH since we assured it would not above? */
7506 #ifdef INVARIANTS
7507                 panic("prepend failes HELP?");
7508 #else
7509                 SCTP_PRINTF("prepend fails HELP?\n");
7510                 sctp_free_a_chunk(stcb, chk, so_locked);
7511 #endif
7512                 *bail = 1;
7513                 to_move = 0;
7514                 goto out_of;
7515         }
7516         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7517         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7518         chk->book_size_scale = 0;
7519         chk->sent = SCTP_DATAGRAM_UNSENT;
7520
7521         chk->flags = 0;
7522         chk->asoc = &stcb->asoc;
7523         chk->pad_inplace = 0;
7524         chk->no_fr_allowed = 0;
7525         chk->rec.data.stream_seq = strq->next_sequence_send;
7526         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7527             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7528                 strq->next_sequence_send++;
7529         }
7530         chk->rec.data.stream_number = sp->stream;
7531         chk->rec.data.payloadtype = sp->ppid;
7532         chk->rec.data.context = sp->context;
7533         chk->rec.data.doing_fast_retransmit = 0;
7534
7535         chk->rec.data.timetodrop = sp->ts;
7536         chk->flags = sp->act_flags;
7537
7538         if (sp->net) {
7539                 chk->whoTo = sp->net;
7540                 atomic_add_int(&chk->whoTo->ref_count, 1);
7541         } else
7542                 chk->whoTo = NULL;
7543
7544         if (sp->holds_key_ref) {
7545                 chk->auth_keyid = sp->auth_keyid;
7546                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7547                 chk->holds_key_ref = 1;
7548         }
7549         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7550         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7551                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7552                     (uintptr_t) stcb, sp->length,
7553                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7554                     chk->rec.data.TSN_seq);
7555         }
7556         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7557         /*
7558          * Put the rest of the things in place now. Size was done earlier in
7559          * previous loop prior to padding.
7560          */
7561
7562 #ifdef SCTP_ASOCLOG_OF_TSNS
7563         SCTP_TCB_LOCK_ASSERT(stcb);
7564         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7565                 asoc->tsn_out_at = 0;
7566                 asoc->tsn_out_wrapped = 1;
7567         }
7568         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7569         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7570         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7571         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7572         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7573         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7574         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7575         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7576         asoc->tsn_out_at++;
7577 #endif
7578
7579         dchkh->ch.chunk_type = SCTP_DATA;
7580         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7581         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7582         dchkh->dp.stream_id = htons(strq->stream_no);
7583         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7584         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7585         dchkh->ch.chunk_length = htons(chk->send_size);
7586         /* Now advance the chk->send_size by the actual pad needed. */
7587         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7588                 /* need a pad */
7589                 struct mbuf *lm;
7590                 int pads;
7591
7592                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7593                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7594                 if (lm != NULL) {
7595                         chk->last_mbuf = lm;
7596                         chk->pad_inplace = 1;
7597                 }
7598                 chk->send_size += pads;
7599         }
7600         if (PR_SCTP_ENABLED(chk->flags)) {
7601                 asoc->pr_sctp_cnt++;
7602         }
7603         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7604                 /* All done pull and kill the message */
7605                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7606                 if (sp->put_last_out == 0) {
7607                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7608                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7609                             sp->sender_all_done,
7610                             sp->length,
7611                             sp->msg_is_complete,
7612                             sp->put_last_out,
7613                             send_lock_up);
7614                 }
7615                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7616                         SCTP_TCB_SEND_LOCK(stcb);
7617                         send_lock_up = 1;
7618                 }
7619                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7620                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7621                     (strq->chunks_on_queues == 0) &&
7622                     TAILQ_EMPTY(&strq->outqueue)) {
7623                         stcb->asoc.trigger_reset = 1;
7624                 }
7625                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7626                 if (sp->net) {
7627                         sctp_free_remote_addr(sp->net);
7628                         sp->net = NULL;
7629                 }
7630                 if (sp->data) {
7631                         sctp_m_freem(sp->data);
7632                         sp->data = NULL;
7633                 }
7634                 sctp_free_a_strmoq(stcb, sp, so_locked);
7635
7636                 /* we can't be locked to it */
7637                 *locked = 0;
7638                 stcb->asoc.locked_on_sending = NULL;
7639         } else {
7640                 /* more to go, we are locked */
7641                 *locked = 1;
7642         }
7643         asoc->chunks_on_out_queue++;
7644         strq->chunks_on_queues++;
7645         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7646         asoc->send_queue_cnt++;
7647 out_of:
7648         if (send_lock_up) {
7649                 SCTP_TCB_SEND_UNLOCK(stcb);
7650         }
7651         return (to_move);
7652 }
7653
7654
7655 static void
7656 sctp_fill_outqueue(struct sctp_tcb *stcb,
7657     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7658 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7659     SCTP_UNUSED
7660 #endif
7661 )
7662 {
7663         struct sctp_association *asoc;
7664         struct sctp_stream_out *strq;
7665         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7666         int locked, giveup;
7667
7668         SCTP_TCB_LOCK_ASSERT(stcb);
7669         asoc = &stcb->asoc;
7670         switch (net->ro._l_addr.sa.sa_family) {
7671 #ifdef INET
7672         case AF_INET:
7673                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7674                 break;
7675 #endif
7676 #ifdef INET6
7677         case AF_INET6:
7678                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7679                 break;
7680 #endif
7681         default:
7682                 /* TSNH */
7683                 goal_mtu = net->mtu;
7684                 break;
7685         }
7686         /* Need an allowance for the data chunk header too */
7687         goal_mtu -= sizeof(struct sctp_data_chunk);
7688
7689         /* must make even word boundary */
7690         goal_mtu &= 0xfffffffc;
7691         if (asoc->locked_on_sending) {
7692                 /* We are stuck on one stream until the message completes. */
7693                 strq = asoc->locked_on_sending;
7694                 locked = 1;
7695         } else {
7696                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7697                 locked = 0;
7698         }
7699         while ((goal_mtu > 0) && strq) {
7700                 giveup = 0;
7701                 bail = 0;
7702                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7703                     &giveup, eeor_mode, &bail, so_locked);
7704                 if (moved_how_much)
7705                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7706
7707                 if (locked) {
7708                         asoc->locked_on_sending = strq;
7709                         if ((moved_how_much == 0) || (giveup) || bail)
7710                                 /* no more to move for now */
7711                                 break;
7712                 } else {
7713                         asoc->locked_on_sending = NULL;
7714                         if ((giveup) || bail) {
7715                                 break;
7716                         }
7717                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7718                         if (strq == NULL) {
7719                                 break;
7720                         }
7721                 }
7722                 total_moved += moved_how_much;
7723                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7724                 goal_mtu &= 0xfffffffc;
7725         }
7726         if (bail)
7727                 *quit_now = 1;
7728
7729         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7730
7731         if (total_moved == 0) {
7732                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7733                     (net == stcb->asoc.primary_destination)) {
7734                         /* ran dry for primary network net */
7735                         SCTP_STAT_INCR(sctps_primary_randry);
7736                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7737                         /* ran dry with CMT on */
7738                         SCTP_STAT_INCR(sctps_cmt_randry);
7739                 }
7740         }
7741 }
7742
7743 void
7744 sctp_fix_ecn_echo(struct sctp_association *asoc)
7745 {
7746         struct sctp_tmit_chunk *chk;
7747
7748         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7749                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7750                         chk->sent = SCTP_DATAGRAM_UNSENT;
7751                 }
7752         }
7753 }
7754
7755 void
7756 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7757 {
7758         struct sctp_association *asoc;
7759         struct sctp_tmit_chunk *chk;
7760         struct sctp_stream_queue_pending *sp;
7761         unsigned int i;
7762
7763         if (net == NULL) {
7764                 return;
7765         }
7766         asoc = &stcb->asoc;
7767         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7768                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7769                         if (sp->net == net) {
7770                                 sctp_free_remote_addr(sp->net);
7771                                 sp->net = NULL;
7772                         }
7773                 }
7774         }
7775         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7776                 if (chk->whoTo == net) {
7777                         sctp_free_remote_addr(chk->whoTo);
7778                         chk->whoTo = NULL;
7779                 }
7780         }
7781 }
7782
7783 int
7784 sctp_med_chunk_output(struct sctp_inpcb *inp,
7785     struct sctp_tcb *stcb,
7786     struct sctp_association *asoc,
7787     int *num_out,
7788     int *reason_code,
7789     int control_only, int from_where,
7790     struct timeval *now, int *now_filled, int frag_point, int so_locked
7791 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7792     SCTP_UNUSED
7793 #endif
7794 )
7795 {
7796         /**
7797          * Ok this is the generic chunk service queue. we must do the
7798          * following: - Service the stream queue that is next, moving any
7799          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7800          * LAST to the out queue in one pass) and assigning TSN's - Check to
7801          * see if the cwnd/rwnd allows any output, if so we go ahead and
7802          * fomulate and send the low level chunks. Making sure to combine
7803          * any control in the control chunk queue also.
7804          */
7805         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7806         struct mbuf *outchain, *endoutchain;
7807         struct sctp_tmit_chunk *chk, *nchk;
7808
7809         /* temp arrays for unlinking */
7810         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7811         int no_fragmentflg, error;
7812         unsigned int max_rwnd_per_dest, max_send_per_dest;
7813         int one_chunk, hbflag, skip_data_for_this_net;
7814         int asconf, cookie, no_out_cnt;
7815         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7816         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7817         int tsns_sent = 0;
7818         uint32_t auth_offset = 0;
7819         struct sctp_auth_chunk *auth = NULL;
7820         uint16_t auth_keyid;
7821         int override_ok = 1;
7822         int skip_fill_up = 0;
7823         int data_auth_reqd = 0;
7824
7825         /*
7826          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7827          * destination.
7828          */
7829         int quit_now = 0;
7830
7831         *num_out = 0;
7832         *reason_code = 0;
7833         auth_keyid = stcb->asoc.authinfo.active_keyid;
7834         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7835             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7836             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7837                 eeor_mode = 1;
7838         } else {
7839                 eeor_mode = 0;
7840         }
7841         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7842         /*
7843          * First lets prime the pump. For each destination, if there is room
7844          * in the flight size, attempt to pull an MTU's worth out of the
7845          * stream queues into the general send_queue
7846          */
7847 #ifdef SCTP_AUDITING_ENABLED
7848         sctp_audit_log(0xC2, 2);
7849 #endif
7850         SCTP_TCB_LOCK_ASSERT(stcb);
7851         hbflag = 0;
7852         if (control_only)
7853                 no_data_chunks = 1;
7854         else
7855                 no_data_chunks = 0;
7856
7857         /* Nothing to possible to send? */
7858         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7859             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7860             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7861             TAILQ_EMPTY(&asoc->send_queue) &&
7862             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7863 nothing_to_send:
7864                 *reason_code = 9;
7865                 return (0);
7866         }
7867         if (asoc->peers_rwnd == 0) {
7868                 /* No room in peers rwnd */
7869                 *reason_code = 1;
7870                 if (asoc->total_flight > 0) {
7871                         /* we are allowed one chunk in flight */
7872                         no_data_chunks = 1;
7873                 }
7874         }
7875         if (stcb->asoc.ecn_echo_cnt_onq) {
7876                 /* Record where a sack goes, if any */
7877                 if (no_data_chunks &&
7878                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7879                         /* Nothing but ECNe to send - we don't do that */
7880                         goto nothing_to_send;
7881                 }
7882                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7883                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7884                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7885                                 sack_goes_to = chk->whoTo;
7886                                 break;
7887                         }
7888                 }
7889         }
7890         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7891         if (stcb->sctp_socket)
7892                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7893         else
7894                 max_send_per_dest = 0;
7895         if (no_data_chunks == 0) {
7896                 /* How many non-directed chunks are there? */
7897                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7898                         if (chk->whoTo == NULL) {
7899                                 /*
7900                                  * We already have non-directed chunks on
7901                                  * the queue, no need to do a fill-up.
7902                                  */
7903                                 skip_fill_up = 1;
7904                                 break;
7905                         }
7906                 }
7907
7908         }
7909         if ((no_data_chunks == 0) &&
7910             (skip_fill_up == 0) &&
7911             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7912                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7913                         /*
7914                          * This for loop we are in takes in each net, if
7915                          * its's got space in cwnd and has data sent to it
7916                          * (when CMT is off) then it calls
7917                          * sctp_fill_outqueue for the net. This gets data on
7918                          * the send queue for that network.
7919                          *
7920                          * In sctp_fill_outqueue TSN's are assigned and data is
7921                          * copied out of the stream buffers. Note mostly
7922                          * copy by reference (we hope).
7923                          */
7924                         net->window_probe = 0;
7925                         if ((net != stcb->asoc.alternate) &&
7926                             ((net->dest_state & SCTP_ADDR_PF) ||
7927                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7928                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7929                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7930                                         sctp_log_cwnd(stcb, net, 1,
7931                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7932                                 }
7933                                 continue;
7934                         }
7935                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7936                             (net->flight_size == 0)) {
7937                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7938                         }
7939                         if (net->flight_size >= net->cwnd) {
7940                                 /* skip this network, no room - can't fill */
7941                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7942                                         sctp_log_cwnd(stcb, net, 3,
7943                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7944                                 }
7945                                 continue;
7946                         }
7947                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7948                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7949                         }
7950                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7951                         if (quit_now) {
7952                                 /* memory alloc failure */
7953                                 no_data_chunks = 1;
7954                                 break;
7955                         }
7956                 }
7957         }
7958         /* now service each destination and send out what we can for it */
7959         /* Nothing to send? */
7960         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7961             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7962             TAILQ_EMPTY(&asoc->send_queue)) {
7963                 *reason_code = 8;
7964                 return (0);
7965         }
7966         if (asoc->sctp_cmt_on_off > 0) {
7967                 /* get the last start point */
7968                 start_at = asoc->last_net_cmt_send_started;
7969                 if (start_at == NULL) {
7970                         /* null so to beginning */
7971                         start_at = TAILQ_FIRST(&asoc->nets);
7972                 } else {
7973                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7974                         if (start_at == NULL) {
7975                                 start_at = TAILQ_FIRST(&asoc->nets);
7976                         }
7977                 }
7978                 asoc->last_net_cmt_send_started = start_at;
7979         } else {
7980                 start_at = TAILQ_FIRST(&asoc->nets);
7981         }
7982         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7983                 if (chk->whoTo == NULL) {
7984                         if (asoc->alternate) {
7985                                 chk->whoTo = asoc->alternate;
7986                         } else {
7987                                 chk->whoTo = asoc->primary_destination;
7988                         }
7989                         atomic_add_int(&chk->whoTo->ref_count, 1);
7990                 }
7991         }
7992         old_start_at = NULL;
7993 again_one_more_time:
7994         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7995                 /* how much can we send? */
7996                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7997                 if (old_start_at && (old_start_at == net)) {
7998                         /* through list ocmpletely. */
7999                         break;
8000                 }
8001                 tsns_sent = 0xa;
8002                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8003                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8004                     (net->flight_size >= net->cwnd)) {
8005                         /*
8006                          * Nothing on control or asconf and flight is full,
8007                          * we can skip even in the CMT case.
8008                          */
8009                         continue;
8010                 }
8011                 bundle_at = 0;
8012                 endoutchain = outchain = NULL;
8013                 no_fragmentflg = 1;
8014                 one_chunk = 0;
8015                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8016                         skip_data_for_this_net = 1;
8017                 } else {
8018                         skip_data_for_this_net = 0;
8019                 }
8020                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8021 #ifdef INET
8022                 case AF_INET:
8023                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8024                         break;
8025 #endif
8026 #ifdef INET6
8027                 case AF_INET6:
8028                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8029                         break;
8030 #endif
8031                 default:
8032                         /* TSNH */
8033                         mtu = net->mtu;
8034                         break;
8035                 }
8036                 mx_mtu = mtu;
8037                 to_out = 0;
8038                 if (mtu > asoc->peers_rwnd) {
8039                         if (asoc->total_flight > 0) {
8040                                 /* We have a packet in flight somewhere */
8041                                 r_mtu = asoc->peers_rwnd;
8042                         } else {
8043                                 /* We are always allowed to send one MTU out */
8044                                 one_chunk = 1;
8045                                 r_mtu = mtu;
8046                         }
8047                 } else {
8048                         r_mtu = mtu;
8049                 }
8050                 error = 0;
8051                 /************************/
8052                 /* ASCONF transmission */
8053                 /************************/
8054                 /* Now first lets go through the asconf queue */
8055                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8056                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8057                                 continue;
8058                         }
8059                         if (chk->whoTo == NULL) {
8060                                 if (asoc->alternate == NULL) {
8061                                         if (asoc->primary_destination != net) {
8062                                                 break;
8063                                         }
8064                                 } else {
8065                                         if (asoc->alternate != net) {
8066                                                 break;
8067                                         }
8068                                 }
8069                         } else {
8070                                 if (chk->whoTo != net) {
8071                                         break;
8072                                 }
8073                         }
8074                         if (chk->data == NULL) {
8075                                 break;
8076                         }
8077                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8078                             chk->sent != SCTP_DATAGRAM_RESEND) {
8079                                 break;
8080                         }
8081                         /*
8082                          * if no AUTH is yet included and this chunk
8083                          * requires it, make sure to account for it.  We
8084                          * don't apply the size until the AUTH chunk is
8085                          * actually added below in case there is no room for
8086                          * this chunk. NOTE: we overload the use of "omtu"
8087                          * here
8088                          */
8089                         if ((auth == NULL) &&
8090                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8091                             stcb->asoc.peer_auth_chunks)) {
8092                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8093                         } else
8094                                 omtu = 0;
8095                         /* Here we do NOT factor the r_mtu */
8096                         if ((chk->send_size < (int)(mtu - omtu)) ||
8097                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8098                                 /*
8099                                  * We probably should glom the mbuf chain
8100                                  * from the chk->data for control but the
8101                                  * problem is it becomes yet one more level
8102                                  * of tracking to do if for some reason
8103                                  * output fails. Then I have got to
8104                                  * reconstruct the merged control chain.. el
8105                                  * yucko.. for now we take the easy way and
8106                                  * do the copy
8107                                  */
8108                                 /*
8109                                  * Add an AUTH chunk, if chunk requires it
8110                                  * save the offset into the chain for AUTH
8111                                  */
8112                                 if ((auth == NULL) &&
8113                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8114                                     stcb->asoc.peer_auth_chunks))) {
8115                                         outchain = sctp_add_auth_chunk(outchain,
8116                                             &endoutchain,
8117                                             &auth,
8118                                             &auth_offset,
8119                                             stcb,
8120                                             chk->rec.chunk_id.id);
8121                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8122                                 }
8123                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8124                                     (int)chk->rec.chunk_id.can_take_data,
8125                                     chk->send_size, chk->copy_by_ref);
8126                                 if (outchain == NULL) {
8127                                         *reason_code = 8;
8128                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8129                                         return (ENOMEM);
8130                                 }
8131                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8132                                 /* update our MTU size */
8133                                 if (mtu > (chk->send_size + omtu))
8134                                         mtu -= (chk->send_size + omtu);
8135                                 else
8136                                         mtu = 0;
8137                                 to_out += (chk->send_size + omtu);
8138                                 /* Do clear IP_DF ? */
8139                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8140                                         no_fragmentflg = 0;
8141                                 }
8142                                 if (chk->rec.chunk_id.can_take_data)
8143                                         chk->data = NULL;
8144                                 /*
8145                                  * set hb flag since we can use these for
8146                                  * RTO
8147                                  */
8148                                 hbflag = 1;
8149                                 asconf = 1;
8150                                 /*
8151                                  * should sysctl this: don't bundle data
8152                                  * with ASCONF since it requires AUTH
8153                                  */
8154                                 no_data_chunks = 1;
8155                                 chk->sent = SCTP_DATAGRAM_SENT;
8156                                 if (chk->whoTo == NULL) {
8157                                         chk->whoTo = net;
8158                                         atomic_add_int(&net->ref_count, 1);
8159                                 }
8160                                 chk->snd_count++;
8161                                 if (mtu == 0) {
8162                                         /*
8163                                          * Ok we are out of room but we can
8164                                          * output without effecting the
8165                                          * flight size since this little guy
8166                                          * is a control only packet.
8167                                          */
8168                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8169                                         /*
8170                                          * do NOT clear the asconf flag as
8171                                          * it is used to do appropriate
8172                                          * source address selection.
8173                                          */
8174                                         if (*now_filled == 0) {
8175                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8176                                                 *now_filled = 1;
8177                                         }
8178                                         net->last_sent_time = *now;
8179                                         hbflag = 0;
8180                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8181                                             (struct sockaddr *)&net->ro._l_addr,
8182                                             outchain, auth_offset, auth,
8183                                             stcb->asoc.authinfo.active_keyid,
8184                                             no_fragmentflg, 0, asconf,
8185                                             inp->sctp_lport, stcb->rport,
8186                                             htonl(stcb->asoc.peer_vtag),
8187                                             net->port, NULL,
8188                                             0, 0,
8189                                             so_locked))) {
8190                                                 /*
8191                                                  * error, we could not
8192                                                  * output
8193                                                  */
8194                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8195                                                 if (from_where == 0) {
8196                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8197                                                 }
8198                                                 if (error == ENOBUFS) {
8199                                                         asoc->ifp_had_enobuf = 1;
8200                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8201                                                 }
8202                                                 /* error, could not output */
8203                                                 if (error == EHOSTUNREACH) {
8204                                                         /*
8205                                                          * Destination went
8206                                                          * unreachable
8207                                                          * during this send
8208                                                          */
8209                                                         sctp_move_chunks_from_net(stcb, net);
8210                                                 }
8211                                                 *reason_code = 7;
8212                                                 break;
8213                                         } else {
8214                                                 asoc->ifp_had_enobuf = 0;
8215                                         }
8216                                         /*
8217                                          * increase the number we sent, if a
8218                                          * cookie is sent we don't tell them
8219                                          * any was sent out.
8220                                          */
8221                                         outchain = endoutchain = NULL;
8222                                         auth = NULL;
8223                                         auth_offset = 0;
8224                                         if (!no_out_cnt)
8225                                                 *num_out += ctl_cnt;
8226                                         /* recalc a clean slate and setup */
8227                                         switch (net->ro._l_addr.sa.sa_family) {
8228 #ifdef INET
8229                                         case AF_INET:
8230                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8231                                                 break;
8232 #endif
8233 #ifdef INET6
8234                                         case AF_INET6:
8235                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8236                                                 break;
8237 #endif
8238                                         default:
8239                                                 /* TSNH */
8240                                                 mtu = net->mtu;
8241                                                 break;
8242                                         }
8243                                         to_out = 0;
8244                                         no_fragmentflg = 1;
8245                                 }
8246                         }
8247                 }
8248                 if (error != 0) {
8249                         /* try next net */
8250                         continue;
8251                 }
8252                 /************************/
8253                 /* Control transmission */
8254                 /************************/
8255                 /* Now first lets go through the control queue */
8256                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8257                         if ((sack_goes_to) &&
8258                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8259                             (chk->whoTo != sack_goes_to)) {
8260                                 /*
8261                                  * if we have a sack in queue, and we are
8262                                  * looking at an ecn echo that is NOT queued
8263                                  * to where the sack is going..
8264                                  */
8265                                 if (chk->whoTo == net) {
8266                                         /*
8267                                          * Don't transmit it to where its
8268                                          * going (current net)
8269                                          */
8270                                         continue;
8271                                 } else if (sack_goes_to == net) {
8272                                         /*
8273                                          * But do transmit it to this
8274                                          * address
8275                                          */
8276                                         goto skip_net_check;
8277                                 }
8278                         }
8279                         if (chk->whoTo == NULL) {
8280                                 if (asoc->alternate == NULL) {
8281                                         if (asoc->primary_destination != net) {
8282                                                 continue;
8283                                         }
8284                                 } else {
8285                                         if (asoc->alternate != net) {
8286                                                 continue;
8287                                         }
8288                                 }
8289                         } else {
8290                                 if (chk->whoTo != net) {
8291                                         continue;
8292                                 }
8293                         }
8294         skip_net_check:
8295                         if (chk->data == NULL) {
8296                                 continue;
8297                         }
8298                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8299                                 /*
8300                                  * It must be unsent. Cookies and ASCONF's
8301                                  * hang around but there timers will force
8302                                  * when marked for resend.
8303                                  */
8304                                 continue;
8305                         }
8306                         /*
8307                          * if no AUTH is yet included and this chunk
8308                          * requires it, make sure to account for it.  We
8309                          * don't apply the size until the AUTH chunk is
8310                          * actually added below in case there is no room for
8311                          * this chunk. NOTE: we overload the use of "omtu"
8312                          * here
8313                          */
8314                         if ((auth == NULL) &&
8315                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8316                             stcb->asoc.peer_auth_chunks)) {
8317                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8318                         } else
8319                                 omtu = 0;
8320                         /* Here we do NOT factor the r_mtu */
8321                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8322                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8323                                 /*
8324                                  * We probably should glom the mbuf chain
8325                                  * from the chk->data for control but the
8326                                  * problem is it becomes yet one more level
8327                                  * of tracking to do if for some reason
8328                                  * output fails. Then I have got to
8329                                  * reconstruct the merged control chain.. el
8330                                  * yucko.. for now we take the easy way and
8331                                  * do the copy
8332                                  */
8333                                 /*
8334                                  * Add an AUTH chunk, if chunk requires it
8335                                  * save the offset into the chain for AUTH
8336                                  */
8337                                 if ((auth == NULL) &&
8338                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8339                                     stcb->asoc.peer_auth_chunks))) {
8340                                         outchain = sctp_add_auth_chunk(outchain,
8341                                             &endoutchain,
8342                                             &auth,
8343                                             &auth_offset,
8344                                             stcb,
8345                                             chk->rec.chunk_id.id);
8346                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8347                                 }
8348                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8349                                     (int)chk->rec.chunk_id.can_take_data,
8350                                     chk->send_size, chk->copy_by_ref);
8351                                 if (outchain == NULL) {
8352                                         *reason_code = 8;
8353                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8354                                         return (ENOMEM);
8355                                 }
8356                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8357                                 /* update our MTU size */
8358                                 if (mtu > (chk->send_size + omtu))
8359                                         mtu -= (chk->send_size + omtu);
8360                                 else
8361                                         mtu = 0;
8362                                 to_out += (chk->send_size + omtu);
8363                                 /* Do clear IP_DF ? */
8364                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8365                                         no_fragmentflg = 0;
8366                                 }
8367                                 if (chk->rec.chunk_id.can_take_data)
8368                                         chk->data = NULL;
8369                                 /* Mark things to be removed, if needed */
8370                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8371                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8372                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8373                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8374                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8375                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8376                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8377                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8378                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8379                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8380                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8381                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8382                                                 hbflag = 1;
8383                                         }
8384                                         /* remove these chunks at the end */
8385                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8386                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8387                                                 /* turn off the timer */
8388                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8389                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8390                                                             inp, stcb, net,
8391                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8392                                                 }
8393                                         }
8394                                         ctl_cnt++;
8395                                 } else {
8396                                         /*
8397                                          * Other chunks, since they have
8398                                          * timers running (i.e. COOKIE) we
8399                                          * just "trust" that it gets sent or
8400                                          * retransmitted.
8401                                          */
8402                                         ctl_cnt++;
8403                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8404                                                 cookie = 1;
8405                                                 no_out_cnt = 1;
8406                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8407                                                 /*
8408                                                  * Increment ecne send count
8409                                                  * here this means we may be
8410                                                  * over-zealous in our
8411                                                  * counting if the send
8412                                                  * fails, but its the best
8413                                                  * place to do it (we used
8414                                                  * to do it in the queue of
8415                                                  * the chunk, but that did
8416                                                  * not tell how many times
8417                                                  * it was sent.
8418                                                  */
8419                                                 SCTP_STAT_INCR(sctps_sendecne);
8420                                         }
8421                                         chk->sent = SCTP_DATAGRAM_SENT;
8422                                         if (chk->whoTo == NULL) {
8423                                                 chk->whoTo = net;
8424                                                 atomic_add_int(&net->ref_count, 1);
8425                                         }
8426                                         chk->snd_count++;
8427                                 }
8428                                 if (mtu == 0) {
8429                                         /*
8430                                          * Ok we are out of room but we can
8431                                          * output without effecting the
8432                                          * flight size since this little guy
8433                                          * is a control only packet.
8434                                          */
8435                                         if (asconf) {
8436                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8437                                                 /*
8438                                                  * do NOT clear the asconf
8439                                                  * flag as it is used to do
8440                                                  * appropriate source
8441                                                  * address selection.
8442                                                  */
8443                                         }
8444                                         if (cookie) {
8445                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8446                                                 cookie = 0;
8447                                         }
8448                                         /* Only HB or ASCONF advances time */
8449                                         if (hbflag) {
8450                                                 if (*now_filled == 0) {
8451                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8452                                                         *now_filled = 1;
8453                                                 }
8454                                                 net->last_sent_time = *now;
8455                                                 hbflag = 0;
8456                                         }
8457                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8458                                             (struct sockaddr *)&net->ro._l_addr,
8459                                             outchain,
8460                                             auth_offset, auth,
8461                                             stcb->asoc.authinfo.active_keyid,
8462                                             no_fragmentflg, 0, asconf,
8463                                             inp->sctp_lport, stcb->rport,
8464                                             htonl(stcb->asoc.peer_vtag),
8465                                             net->port, NULL,
8466                                             0, 0,
8467                                             so_locked))) {
8468                                                 /*
8469                                                  * error, we could not
8470                                                  * output
8471                                                  */
8472                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8473                                                 if (from_where == 0) {
8474                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8475                                                 }
8476                                                 if (error == ENOBUFS) {
8477                                                         asoc->ifp_had_enobuf = 1;
8478                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8479                                                 }
8480                                                 if (error == EHOSTUNREACH) {
8481                                                         /*
8482                                                          * Destination went
8483                                                          * unreachable
8484                                                          * during this send
8485                                                          */
8486                                                         sctp_move_chunks_from_net(stcb, net);
8487                                                 }
8488                                                 *reason_code = 7;
8489                                                 break;
8490                                         } else {
8491                                                 asoc->ifp_had_enobuf = 0;
8492                                         }
8493                                         /*
8494                                          * increase the number we sent, if a
8495                                          * cookie is sent we don't tell them
8496                                          * any was sent out.
8497                                          */
8498                                         outchain = endoutchain = NULL;
8499                                         auth = NULL;
8500                                         auth_offset = 0;
8501                                         if (!no_out_cnt)
8502                                                 *num_out += ctl_cnt;
8503                                         /* recalc a clean slate and setup */
8504                                         switch (net->ro._l_addr.sa.sa_family) {
8505 #ifdef INET
8506                                         case AF_INET:
8507                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8508                                                 break;
8509 #endif
8510 #ifdef INET6
8511                                         case AF_INET6:
8512                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8513                                                 break;
8514 #endif
8515                                         default:
8516                                                 /* TSNH */
8517                                                 mtu = net->mtu;
8518                                                 break;
8519                                         }
8520                                         to_out = 0;
8521                                         no_fragmentflg = 1;
8522                                 }
8523                         }
8524                 }
8525                 if (error != 0) {
8526                         /* try next net */
8527                         continue;
8528                 }
8529                 /* JRI: if dest is in PF state, do not send data to it */
8530                 if ((asoc->sctp_cmt_on_off > 0) &&
8531                     (net != stcb->asoc.alternate) &&
8532                     (net->dest_state & SCTP_ADDR_PF)) {
8533                         goto no_data_fill;
8534                 }
8535                 if (net->flight_size >= net->cwnd) {
8536                         goto no_data_fill;
8537                 }
8538                 if ((asoc->sctp_cmt_on_off > 0) &&
8539                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8540                     (net->flight_size > max_rwnd_per_dest)) {
8541                         goto no_data_fill;
8542                 }
8543                 /*
8544                  * We need a specific accounting for the usage of the send
8545                  * buffer. We also need to check the number of messages per
8546                  * net. For now, this is better than nothing and it disabled
8547                  * by default...
8548                  */
8549                 if ((asoc->sctp_cmt_on_off > 0) &&
8550                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8551                     (max_send_per_dest > 0) &&
8552                     (net->flight_size > max_send_per_dest)) {
8553                         goto no_data_fill;
8554                 }
8555                 /*********************/
8556                 /* Data transmission */
8557                 /*********************/
8558                 /*
8559                  * if AUTH for DATA is required and no AUTH has been added
8560                  * yet, account for this in the mtu now... if no data can be
8561                  * bundled, this adjustment won't matter anyways since the
8562                  * packet will be going out...
8563                  */
8564                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8565                     stcb->asoc.peer_auth_chunks);
8566                 if (data_auth_reqd && (auth == NULL)) {
8567                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8568                 }
8569                 /* now lets add any data within the MTU constraints */
8570                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8571 #ifdef INET
8572                 case AF_INET:
8573                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8574                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8575                         else
8576                                 omtu = 0;
8577                         break;
8578 #endif
8579 #ifdef INET6
8580                 case AF_INET6:
8581                         if (net->mtu > SCTP_MIN_OVERHEAD)
8582                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8583                         else
8584                                 omtu = 0;
8585                         break;
8586 #endif
8587                 default:
8588                         /* TSNH */
8589                         omtu = 0;
8590                         break;
8591                 }
8592                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8593                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8594                     (skip_data_for_this_net == 0)) ||
8595                     (cookie)) {
8596                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8597                                 if (no_data_chunks) {
8598                                         /* let only control go out */
8599                                         *reason_code = 1;
8600                                         break;
8601                                 }
8602                                 if (net->flight_size >= net->cwnd) {
8603                                         /* skip this net, no room for data */
8604                                         *reason_code = 2;
8605                                         break;
8606                                 }
8607                                 if ((chk->whoTo != NULL) &&
8608                                     (chk->whoTo != net)) {
8609                                         /* Don't send the chunk on this net */
8610                                         continue;
8611                                 }
8612                                 if (asoc->sctp_cmt_on_off == 0) {
8613                                         if ((asoc->alternate) &&
8614                                             (asoc->alternate != net) &&
8615                                             (chk->whoTo == NULL)) {
8616                                                 continue;
8617                                         } else if ((net != asoc->primary_destination) &&
8618                                                     (asoc->alternate == NULL) &&
8619                                             (chk->whoTo == NULL)) {
8620                                                 continue;
8621                                         }
8622                                 }
8623                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8624                                         /*-
8625                                          * strange, we have a chunk that is
8626                                          * to big for its destination and
8627                                          * yet no fragment ok flag.
8628                                          * Something went wrong when the
8629                                          * PMTU changed...we did not mark
8630                                          * this chunk for some reason?? I
8631                                          * will fix it here by letting IP
8632                                          * fragment it for now and printing
8633                                          * a warning. This really should not
8634                                          * happen ...
8635                                          */
8636                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8637                                             chk->send_size, mtu);
8638                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8639                                 }
8640                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8641                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8642                                         struct sctp_data_chunk *dchkh;
8643
8644                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8645                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8646                                 }
8647                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8648                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8649                                         /* ok we will add this one */
8650
8651                                         /*
8652                                          * Add an AUTH chunk, if chunk
8653                                          * requires it, save the offset into
8654                                          * the chain for AUTH
8655                                          */
8656                                         if (data_auth_reqd) {
8657                                                 if (auth == NULL) {
8658                                                         outchain = sctp_add_auth_chunk(outchain,
8659                                                             &endoutchain,
8660                                                             &auth,
8661                                                             &auth_offset,
8662                                                             stcb,
8663                                                             SCTP_DATA);
8664                                                         auth_keyid = chk->auth_keyid;
8665                                                         override_ok = 0;
8666                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8667                                                 } else if (override_ok) {
8668                                                         /*
8669                                                          * use this data's
8670                                                          * keyid
8671                                                          */
8672                                                         auth_keyid = chk->auth_keyid;
8673                                                         override_ok = 0;
8674                                                 } else if (auth_keyid != chk->auth_keyid) {
8675                                                         /*
8676                                                          * different keyid,
8677                                                          * so done bundling
8678                                                          */
8679                                                         break;
8680                                                 }
8681                                         }
8682                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8683                                             chk->send_size, chk->copy_by_ref);
8684                                         if (outchain == NULL) {
8685                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8686                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8687                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8688                                                 }
8689                                                 *reason_code = 3;
8690                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8691                                                 return (ENOMEM);
8692                                         }
8693                                         /* upate our MTU size */
8694                                         /* Do clear IP_DF ? */
8695                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8696                                                 no_fragmentflg = 0;
8697                                         }
8698                                         /* unsigned subtraction of mtu */
8699                                         if (mtu > chk->send_size)
8700                                                 mtu -= chk->send_size;
8701                                         else
8702                                                 mtu = 0;
8703                                         /* unsigned subtraction of r_mtu */
8704                                         if (r_mtu > chk->send_size)
8705                                                 r_mtu -= chk->send_size;
8706                                         else
8707                                                 r_mtu = 0;
8708
8709                                         to_out += chk->send_size;
8710                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8711 #ifdef INVARIANTS
8712                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8713 #else
8714                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8715                                                     mx_mtu, to_out);
8716 #endif
8717                                         }
8718                                         chk->window_probe = 0;
8719                                         data_list[bundle_at++] = chk;
8720                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8721                                                 break;
8722                                         }
8723                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8724                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8725                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8726                                                 } else {
8727                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8728                                                 }
8729                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8730                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8731                                                         /*
8732                                                          * Count number of
8733                                                          * user msg's that
8734                                                          * were fragmented
8735                                                          * we do this by
8736                                                          * counting when we
8737                                                          * see a LAST
8738                                                          * fragment only.
8739                                                          */
8740                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8741                                         }
8742                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8743                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8744                                                         data_list[0]->window_probe = 1;
8745                                                         net->window_probe = 1;
8746                                                 }
8747                                                 break;
8748                                         }
8749                                 } else {
8750                                         /*
8751                                          * Must be sent in order of the
8752                                          * TSN's (on a network)
8753                                          */
8754                                         break;
8755                                 }
8756                         }       /* for (chunk gather loop for this net) */
8757                 }               /* if asoc.state OPEN */
8758 no_data_fill:
8759                 /* Is there something to send for this destination? */
8760                 if (outchain) {
8761                         /* We may need to start a control timer or two */
8762                         if (asconf) {
8763                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8764                                     stcb, net);
8765                                 /*
8766                                  * do NOT clear the asconf flag as it is
8767                                  * used to do appropriate source address
8768                                  * selection.
8769                                  */
8770                         }
8771                         if (cookie) {
8772                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8773                                 cookie = 0;
8774                         }
8775                         /* must start a send timer if data is being sent */
8776                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8777                                 /*
8778                                  * no timer running on this destination
8779                                  * restart it.
8780                                  */
8781                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8782                         }
8783                         if (bundle_at || hbflag) {
8784                                 /* For data/asconf and hb set time */
8785                                 if (*now_filled == 0) {
8786                                         (void)SCTP_GETTIME_TIMEVAL(now);
8787                                         *now_filled = 1;
8788                                 }
8789                                 net->last_sent_time = *now;
8790                         }
8791                         /* Now send it, if there is anything to send :> */
8792                         if ((error = sctp_lowlevel_chunk_output(inp,
8793                             stcb,
8794                             net,
8795                             (struct sockaddr *)&net->ro._l_addr,
8796                             outchain,
8797                             auth_offset,
8798                             auth,
8799                             auth_keyid,
8800                             no_fragmentflg,
8801                             bundle_at,
8802                             asconf,
8803                             inp->sctp_lport, stcb->rport,
8804                             htonl(stcb->asoc.peer_vtag),
8805                             net->port, NULL,
8806                             0, 0,
8807                             so_locked))) {
8808                                 /* error, we could not output */
8809                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8810                                 if (from_where == 0) {
8811                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8812                                 }
8813                                 if (error == ENOBUFS) {
8814                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8815                                         asoc->ifp_had_enobuf = 1;
8816                                 }
8817                                 if (error == EHOSTUNREACH) {
8818                                         /*
8819                                          * Destination went unreachable
8820                                          * during this send
8821                                          */
8822                                         sctp_move_chunks_from_net(stcb, net);
8823                                 }
8824                                 *reason_code = 6;
8825                                 /*-
8826                                  * I add this line to be paranoid. As far as
8827                                  * I can tell the continue, takes us back to
8828                                  * the top of the for, but just to make sure
8829                                  * I will reset these again here.
8830                                  */
8831                                 ctl_cnt = bundle_at = 0;
8832                                 continue;       /* This takes us back to the
8833                                                  * for() for the nets. */
8834                         } else {
8835                                 asoc->ifp_had_enobuf = 0;
8836                         }
8837                         endoutchain = NULL;
8838                         auth = NULL;
8839                         auth_offset = 0;
8840                         if (!no_out_cnt) {
8841                                 *num_out += (ctl_cnt + bundle_at);
8842                         }
8843                         if (bundle_at) {
8844                                 /* setup for a RTO measurement */
8845                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8846                                 /* fill time if not already filled */
8847                                 if (*now_filled == 0) {
8848                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8849                                         *now_filled = 1;
8850                                         *now = asoc->time_last_sent;
8851                                 } else {
8852                                         asoc->time_last_sent = *now;
8853                                 }
8854                                 if (net->rto_needed) {
8855                                         data_list[0]->do_rtt = 1;
8856                                         net->rto_needed = 0;
8857                                 }
8858                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8859                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8860                         }
8861                         if (one_chunk) {
8862                                 break;
8863                         }
8864                 }
8865                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8866                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8867                 }
8868         }
8869         if (old_start_at == NULL) {
8870                 old_start_at = start_at;
8871                 start_at = TAILQ_FIRST(&asoc->nets);
8872                 if (old_start_at)
8873                         goto again_one_more_time;
8874         }
8875         /*
8876          * At the end there should be no NON timed chunks hanging on this
8877          * queue.
8878          */
8879         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8880                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8881         }
8882         if ((*num_out == 0) && (*reason_code == 0)) {
8883                 *reason_code = 4;
8884         } else {
8885                 *reason_code = 5;
8886         }
8887         sctp_clean_up_ctl(stcb, asoc, so_locked);
8888         return (0);
8889 }
8890
8891 void
8892 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8893 {
8894         /*-
8895          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8896          * the control chunk queue.
8897          */
8898         struct sctp_chunkhdr *hdr;
8899         struct sctp_tmit_chunk *chk;
8900         struct mbuf *mat, *last_mbuf;
8901         uint32_t chunk_length;
8902         uint16_t padding_length;
8903
8904         SCTP_TCB_LOCK_ASSERT(stcb);
8905         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8906         if (op_err == NULL) {
8907                 return;
8908         }
8909         last_mbuf = NULL;
8910         chunk_length = 0;
8911         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8912                 chunk_length += SCTP_BUF_LEN(mat);
8913                 if (SCTP_BUF_NEXT(mat) == NULL) {
8914                         last_mbuf = mat;
8915                 }
8916         }
8917         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8918                 sctp_m_freem(op_err);
8919                 return;
8920         }
8921         padding_length = chunk_length % 4;
8922         if (padding_length != 0) {
8923                 padding_length = 4 - padding_length;
8924         }
8925         if (padding_length != 0) {
8926                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8927                         sctp_m_freem(op_err);
8928                         return;
8929                 }
8930         }
8931         sctp_alloc_a_chunk(stcb, chk);
8932         if (chk == NULL) {
8933                 /* no memory */
8934                 sctp_m_freem(op_err);
8935                 return;
8936         }
8937         chk->copy_by_ref = 0;
8938         chk->send_size = (uint16_t) chunk_length;
8939         chk->sent = SCTP_DATAGRAM_UNSENT;
8940         chk->snd_count = 0;
8941         chk->asoc = &stcb->asoc;
8942         chk->data = op_err;
8943         chk->whoTo = NULL;
8944         hdr = mtod(op_err, struct sctp_chunkhdr *);
8945         hdr->chunk_type = SCTP_OPERATION_ERROR;
8946         hdr->chunk_flags = 0;
8947         hdr->chunk_length = htons(chk->send_size);
8948         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8949         chk->asoc->ctrl_queue_cnt++;
8950 }
8951
8952 int
8953 sctp_send_cookie_echo(struct mbuf *m,
8954     int offset,
8955     struct sctp_tcb *stcb,
8956     struct sctp_nets *net)
8957 {
8958         /*-
8959          * pull out the cookie and put it at the front of the control chunk
8960          * queue.
8961          */
8962         int at;
8963         struct mbuf *cookie;
8964         struct sctp_paramhdr parm, *phdr;
8965         struct sctp_chunkhdr *hdr;
8966         struct sctp_tmit_chunk *chk;
8967         uint16_t ptype, plen;
8968
8969         SCTP_TCB_LOCK_ASSERT(stcb);
8970         /* First find the cookie in the param area */
8971         cookie = NULL;
8972         at = offset + sizeof(struct sctp_init_chunk);
8973         for (;;) {
8974                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8975                 if (phdr == NULL) {
8976                         return (-3);
8977                 }
8978                 ptype = ntohs(phdr->param_type);
8979                 plen = ntohs(phdr->param_length);
8980                 if (ptype == SCTP_STATE_COOKIE) {
8981                         int pad;
8982
8983                         /* found the cookie */
8984                         if ((pad = (plen % 4))) {
8985                                 plen += 4 - pad;
8986                         }
8987                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8988                         if (cookie == NULL) {
8989                                 /* No memory */
8990                                 return (-2);
8991                         }
8992 #ifdef SCTP_MBUF_LOGGING
8993                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8994                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8995                         }
8996 #endif
8997                         break;
8998                 }
8999                 at += SCTP_SIZE32(plen);
9000         }
9001         /* ok, we got the cookie lets change it into a cookie echo chunk */
9002         /* first the change from param to cookie */
9003         hdr = mtod(cookie, struct sctp_chunkhdr *);
9004         hdr->chunk_type = SCTP_COOKIE_ECHO;
9005         hdr->chunk_flags = 0;
9006         /* get the chunk stuff now and place it in the FRONT of the queue */
9007         sctp_alloc_a_chunk(stcb, chk);
9008         if (chk == NULL) {
9009                 /* no memory */
9010                 sctp_m_freem(cookie);
9011                 return (-5);
9012         }
9013         chk->copy_by_ref = 0;
9014         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9015         chk->rec.chunk_id.can_take_data = 0;
9016         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9017         chk->send_size = plen;
9018         chk->sent = SCTP_DATAGRAM_UNSENT;
9019         chk->snd_count = 0;
9020         chk->asoc = &stcb->asoc;
9021         chk->data = cookie;
9022         chk->whoTo = net;
9023         atomic_add_int(&chk->whoTo->ref_count, 1);
9024         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9025         chk->asoc->ctrl_queue_cnt++;
9026         return (0);
9027 }
9028
9029 void
9030 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9031     struct mbuf *m,
9032     int offset,
9033     int chk_length,
9034     struct sctp_nets *net)
9035 {
9036         /*
9037          * take a HB request and make it into a HB ack and send it.
9038          */
9039         struct mbuf *outchain;
9040         struct sctp_chunkhdr *chdr;
9041         struct sctp_tmit_chunk *chk;
9042
9043
9044         if (net == NULL)
9045                 /* must have a net pointer */
9046                 return;
9047
9048         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9049         if (outchain == NULL) {
9050                 /* gak out of memory */
9051                 return;
9052         }
9053 #ifdef SCTP_MBUF_LOGGING
9054         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9055                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9056         }
9057 #endif
9058         chdr = mtod(outchain, struct sctp_chunkhdr *);
9059         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9060         chdr->chunk_flags = 0;
9061         if (chk_length % 4) {
9062                 /* need pad */
9063                 uint32_t cpthis = 0;
9064                 int padlen;
9065
9066                 padlen = 4 - (chk_length % 4);
9067                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9068         }
9069         sctp_alloc_a_chunk(stcb, chk);
9070         if (chk == NULL) {
9071                 /* no memory */
9072                 sctp_m_freem(outchain);
9073                 return;
9074         }
9075         chk->copy_by_ref = 0;
9076         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9077         chk->rec.chunk_id.can_take_data = 1;
9078         chk->flags = 0;
9079         chk->send_size = chk_length;
9080         chk->sent = SCTP_DATAGRAM_UNSENT;
9081         chk->snd_count = 0;
9082         chk->asoc = &stcb->asoc;
9083         chk->data = outchain;
9084         chk->whoTo = net;
9085         atomic_add_int(&chk->whoTo->ref_count, 1);
9086         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9087         chk->asoc->ctrl_queue_cnt++;
9088 }
9089
9090 void
9091 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9092 {
9093         /* formulate and queue a cookie-ack back to sender */
9094         struct mbuf *cookie_ack;
9095         struct sctp_chunkhdr *hdr;
9096         struct sctp_tmit_chunk *chk;
9097
9098         SCTP_TCB_LOCK_ASSERT(stcb);
9099
9100         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9101         if (cookie_ack == NULL) {
9102                 /* no mbuf's */
9103                 return;
9104         }
9105         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9106         sctp_alloc_a_chunk(stcb, chk);
9107         if (chk == NULL) {
9108                 /* no memory */
9109                 sctp_m_freem(cookie_ack);
9110                 return;
9111         }
9112         chk->copy_by_ref = 0;
9113         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9114         chk->rec.chunk_id.can_take_data = 1;
9115         chk->flags = 0;
9116         chk->send_size = sizeof(struct sctp_chunkhdr);
9117         chk->sent = SCTP_DATAGRAM_UNSENT;
9118         chk->snd_count = 0;
9119         chk->asoc = &stcb->asoc;
9120         chk->data = cookie_ack;
9121         if (chk->asoc->last_control_chunk_from != NULL) {
9122                 chk->whoTo = chk->asoc->last_control_chunk_from;
9123                 atomic_add_int(&chk->whoTo->ref_count, 1);
9124         } else {
9125                 chk->whoTo = NULL;
9126         }
9127         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9128         hdr->chunk_type = SCTP_COOKIE_ACK;
9129         hdr->chunk_flags = 0;
9130         hdr->chunk_length = htons(chk->send_size);
9131         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9132         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9133         chk->asoc->ctrl_queue_cnt++;
9134         return;
9135 }
9136
9137
9138 void
9139 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9140 {
9141         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9142         struct mbuf *m_shutdown_ack;
9143         struct sctp_shutdown_ack_chunk *ack_cp;
9144         struct sctp_tmit_chunk *chk;
9145
9146         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9147         if (m_shutdown_ack == NULL) {
9148                 /* no mbuf's */
9149                 return;
9150         }
9151         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9152         sctp_alloc_a_chunk(stcb, chk);
9153         if (chk == NULL) {
9154                 /* no memory */
9155                 sctp_m_freem(m_shutdown_ack);
9156                 return;
9157         }
9158         chk->copy_by_ref = 0;
9159         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9160         chk->rec.chunk_id.can_take_data = 1;
9161         chk->flags = 0;
9162         chk->send_size = sizeof(struct sctp_chunkhdr);
9163         chk->sent = SCTP_DATAGRAM_UNSENT;
9164         chk->snd_count = 0;
9165         chk->flags = 0;
9166         chk->asoc = &stcb->asoc;
9167         chk->data = m_shutdown_ack;
9168         chk->whoTo = net;
9169         if (chk->whoTo) {
9170                 atomic_add_int(&chk->whoTo->ref_count, 1);
9171         }
9172         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9173         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9174         ack_cp->ch.chunk_flags = 0;
9175         ack_cp->ch.chunk_length = htons(chk->send_size);
9176         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9177         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9178         chk->asoc->ctrl_queue_cnt++;
9179         return;
9180 }
9181
9182 void
9183 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9184 {
9185         /* formulate and queue a SHUTDOWN to the sender */
9186         struct mbuf *m_shutdown;
9187         struct sctp_shutdown_chunk *shutdown_cp;
9188         struct sctp_tmit_chunk *chk;
9189
9190         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9191         if (m_shutdown == NULL) {
9192                 /* no mbuf's */
9193                 return;
9194         }
9195         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9196         sctp_alloc_a_chunk(stcb, chk);
9197         if (chk == NULL) {
9198                 /* no memory */
9199                 sctp_m_freem(m_shutdown);
9200                 return;
9201         }
9202         chk->copy_by_ref = 0;
9203         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9204         chk->rec.chunk_id.can_take_data = 1;
9205         chk->flags = 0;
9206         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9207         chk->sent = SCTP_DATAGRAM_UNSENT;
9208         chk->snd_count = 0;
9209         chk->flags = 0;
9210         chk->asoc = &stcb->asoc;
9211         chk->data = m_shutdown;
9212         chk->whoTo = net;
9213         if (chk->whoTo) {
9214                 atomic_add_int(&chk->whoTo->ref_count, 1);
9215         }
9216         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9217         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9218         shutdown_cp->ch.chunk_flags = 0;
9219         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9220         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9221         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9222         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9223         chk->asoc->ctrl_queue_cnt++;
9224         return;
9225 }
9226
9227 void
9228 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9229 {
9230         /*
9231          * formulate and queue an ASCONF to the peer. ASCONF parameters
9232          * should be queued on the assoc queue.
9233          */
9234         struct sctp_tmit_chunk *chk;
9235         struct mbuf *m_asconf;
9236         int len;
9237
9238         SCTP_TCB_LOCK_ASSERT(stcb);
9239
9240         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9241             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9242                 /* can't send a new one if there is one in flight already */
9243                 return;
9244         }
9245         /* compose an ASCONF chunk, maximum length is PMTU */
9246         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9247         if (m_asconf == NULL) {
9248                 return;
9249         }
9250         sctp_alloc_a_chunk(stcb, chk);
9251         if (chk == NULL) {
9252                 /* no memory */
9253                 sctp_m_freem(m_asconf);
9254                 return;
9255         }
9256         chk->copy_by_ref = 0;
9257         chk->rec.chunk_id.id = SCTP_ASCONF;
9258         chk->rec.chunk_id.can_take_data = 0;
9259         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9260         chk->data = m_asconf;
9261         chk->send_size = len;
9262         chk->sent = SCTP_DATAGRAM_UNSENT;
9263         chk->snd_count = 0;
9264         chk->asoc = &stcb->asoc;
9265         chk->whoTo = net;
9266         if (chk->whoTo) {
9267                 atomic_add_int(&chk->whoTo->ref_count, 1);
9268         }
9269         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9270         chk->asoc->ctrl_queue_cnt++;
9271         return;
9272 }
9273
9274 void
9275 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9276 {
9277         /*
9278          * formulate and queue a asconf-ack back to sender. the asconf-ack
9279          * must be stored in the tcb.
9280          */
9281         struct sctp_tmit_chunk *chk;
9282         struct sctp_asconf_ack *ack, *latest_ack;
9283         struct mbuf *m_ack;
9284         struct sctp_nets *net = NULL;
9285
9286         SCTP_TCB_LOCK_ASSERT(stcb);
9287         /* Get the latest ASCONF-ACK */
9288         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9289         if (latest_ack == NULL) {
9290                 return;
9291         }
9292         if (latest_ack->last_sent_to != NULL &&
9293             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9294                 /* we're doing a retransmission */
9295                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9296                 if (net == NULL) {
9297                         /* no alternate */
9298                         if (stcb->asoc.last_control_chunk_from == NULL) {
9299                                 if (stcb->asoc.alternate) {
9300                                         net = stcb->asoc.alternate;
9301                                 } else {
9302                                         net = stcb->asoc.primary_destination;
9303                                 }
9304                         } else {
9305                                 net = stcb->asoc.last_control_chunk_from;
9306                         }
9307                 }
9308         } else {
9309                 /* normal case */
9310                 if (stcb->asoc.last_control_chunk_from == NULL) {
9311                         if (stcb->asoc.alternate) {
9312                                 net = stcb->asoc.alternate;
9313                         } else {
9314                                 net = stcb->asoc.primary_destination;
9315                         }
9316                 } else {
9317                         net = stcb->asoc.last_control_chunk_from;
9318                 }
9319         }
9320         latest_ack->last_sent_to = net;
9321
9322         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9323                 if (ack->data == NULL) {
9324                         continue;
9325                 }
9326                 /* copy the asconf_ack */
9327                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9328                 if (m_ack == NULL) {
9329                         /* couldn't copy it */
9330                         return;
9331                 }
9332 #ifdef SCTP_MBUF_LOGGING
9333                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9334                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9335                 }
9336 #endif
9337
9338                 sctp_alloc_a_chunk(stcb, chk);
9339                 if (chk == NULL) {
9340                         /* no memory */
9341                         if (m_ack)
9342                                 sctp_m_freem(m_ack);
9343                         return;
9344                 }
9345                 chk->copy_by_ref = 0;
9346                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9347                 chk->rec.chunk_id.can_take_data = 1;
9348                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9349                 chk->whoTo = net;
9350                 if (chk->whoTo) {
9351                         atomic_add_int(&chk->whoTo->ref_count, 1);
9352                 }
9353                 chk->data = m_ack;
9354                 chk->send_size = ack->len;
9355                 chk->sent = SCTP_DATAGRAM_UNSENT;
9356                 chk->snd_count = 0;
9357                 chk->asoc = &stcb->asoc;
9358
9359                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9360                 chk->asoc->ctrl_queue_cnt++;
9361         }
9362         return;
9363 }
9364
9365
9366 static int
9367 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9368     struct sctp_tcb *stcb,
9369     struct sctp_association *asoc,
9370     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9371 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9372     SCTP_UNUSED
9373 #endif
9374 )
9375 {
9376         /*-
9377          * send out one MTU of retransmission. If fast_retransmit is
9378          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9379          * rwnd. For a Cookie or Asconf in the control chunk queue we
9380          * retransmit them by themselves.
9381          *
9382          * For data chunks we will pick out the lowest TSN's in the sent_queue
9383          * marked for resend and bundle them all together (up to a MTU of
9384          * destination). The address to send to should have been
9385          * selected/changed where the retransmission was marked (i.e. in FR
9386          * or t3-timeout routines).
9387          */
9388         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9389         struct sctp_tmit_chunk *chk, *fwd;
9390         struct mbuf *m, *endofchain;
9391         struct sctp_nets *net = NULL;
9392         uint32_t tsns_sent = 0;
9393         int no_fragmentflg, bundle_at, cnt_thru;
9394         unsigned int mtu;
9395         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9396         struct sctp_auth_chunk *auth = NULL;
9397         uint32_t auth_offset = 0;
9398         uint16_t auth_keyid;
9399         int override_ok = 1;
9400         int data_auth_reqd = 0;
9401         uint32_t dmtu = 0;
9402
9403         SCTP_TCB_LOCK_ASSERT(stcb);
9404         tmr_started = ctl_cnt = bundle_at = error = 0;
9405         no_fragmentflg = 1;
9406         fwd_tsn = 0;
9407         *cnt_out = 0;
9408         fwd = NULL;
9409         endofchain = m = NULL;
9410         auth_keyid = stcb->asoc.authinfo.active_keyid;
9411 #ifdef SCTP_AUDITING_ENABLED
9412         sctp_audit_log(0xC3, 1);
9413 #endif
9414         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9415             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9416                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9417                     asoc->sent_queue_retran_cnt);
9418                 asoc->sent_queue_cnt = 0;
9419                 asoc->sent_queue_cnt_removeable = 0;
9420                 /* send back 0/0 so we enter normal transmission */
9421                 *cnt_out = 0;
9422                 return (0);
9423         }
9424         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9425                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9426                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9427                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9428                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9429                                 continue;
9430                         }
9431                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9432                                 if (chk != asoc->str_reset) {
9433                                         /*
9434                                          * not eligible for retran if its
9435                                          * not ours
9436                                          */
9437                                         continue;
9438                                 }
9439                         }
9440                         ctl_cnt++;
9441                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9442                                 fwd_tsn = 1;
9443                         }
9444                         /*
9445                          * Add an AUTH chunk, if chunk requires it save the
9446                          * offset into the chain for AUTH
9447                          */
9448                         if ((auth == NULL) &&
9449                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9450                             stcb->asoc.peer_auth_chunks))) {
9451                                 m = sctp_add_auth_chunk(m, &endofchain,
9452                                     &auth, &auth_offset,
9453                                     stcb,
9454                                     chk->rec.chunk_id.id);
9455                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9456                         }
9457                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9458                         break;
9459                 }
9460         }
9461         one_chunk = 0;
9462         cnt_thru = 0;
9463         /* do we have control chunks to retransmit? */
9464         if (m != NULL) {
9465                 /* Start a timer no matter if we suceed or fail */
9466                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9467                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9468                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9469                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9470                 chk->snd_count++;       /* update our count */
9471                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9472                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9473                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9474                     no_fragmentflg, 0, 0,
9475                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9476                     chk->whoTo->port, NULL,
9477                     0, 0,
9478                     so_locked))) {
9479                         SCTP_STAT_INCR(sctps_lowlevelerr);
9480                         return (error);
9481                 }
9482                 endofchain = NULL;
9483                 auth = NULL;
9484                 auth_offset = 0;
9485                 /*
9486                  * We don't want to mark the net->sent time here since this
9487                  * we use this for HB and retrans cannot measure RTT
9488                  */
9489                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9490                 *cnt_out += 1;
9491                 chk->sent = SCTP_DATAGRAM_SENT;
9492                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9493                 if (fwd_tsn == 0) {
9494                         return (0);
9495                 } else {
9496                         /* Clean up the fwd-tsn list */
9497                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9498                         return (0);
9499                 }
9500         }
9501         /*
9502          * Ok, it is just data retransmission we need to do or that and a
9503          * fwd-tsn with it all.
9504          */
9505         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9506                 return (SCTP_RETRAN_DONE);
9507         }
9508         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9509             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9510                 /* not yet open, resend the cookie and that is it */
9511                 return (1);
9512         }
9513 #ifdef SCTP_AUDITING_ENABLED
9514         sctp_auditing(20, inp, stcb, NULL);
9515 #endif
9516         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9517         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9518                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9519                         /* No, not sent to this net or not ready for rtx */
9520                         continue;
9521                 }
9522                 if (chk->data == NULL) {
9523                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9524                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9525                         continue;
9526                 }
9527                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9528                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9529                         struct mbuf *op_err;
9530                         char msg[SCTP_DIAG_INFO_LEN];
9531
9532                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9533                             chk->rec.data.TSN_seq, chk->snd_count);
9534                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9535                             msg);
9536                         atomic_add_int(&stcb->asoc.refcnt, 1);
9537                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9538                             so_locked);
9539                         SCTP_TCB_LOCK(stcb);
9540                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9541                         return (SCTP_RETRAN_EXIT);
9542                 }
9543                 /* pick up the net */
9544                 net = chk->whoTo;
9545                 switch (net->ro._l_addr.sa.sa_family) {
9546 #ifdef INET
9547                 case AF_INET:
9548                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9549                         break;
9550 #endif
9551 #ifdef INET6
9552                 case AF_INET6:
9553                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9554                         break;
9555 #endif
9556                 default:
9557                         /* TSNH */
9558                         mtu = net->mtu;
9559                         break;
9560                 }
9561
9562                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9563                         /* No room in peers rwnd */
9564                         uint32_t tsn;
9565
9566                         tsn = asoc->last_acked_seq + 1;
9567                         if (tsn == chk->rec.data.TSN_seq) {
9568                                 /*
9569                                  * we make a special exception for this
9570                                  * case. The peer has no rwnd but is missing
9571                                  * the lowest chunk.. which is probably what
9572                                  * is holding up the rwnd.
9573                                  */
9574                                 goto one_chunk_around;
9575                         }
9576                         return (1);
9577                 }
9578 one_chunk_around:
9579                 if (asoc->peers_rwnd < mtu) {
9580                         one_chunk = 1;
9581                         if ((asoc->peers_rwnd == 0) &&
9582                             (asoc->total_flight == 0)) {
9583                                 chk->window_probe = 1;
9584                                 chk->whoTo->window_probe = 1;
9585                         }
9586                 }
9587 #ifdef SCTP_AUDITING_ENABLED
9588                 sctp_audit_log(0xC3, 2);
9589 #endif
9590                 bundle_at = 0;
9591                 m = NULL;
9592                 net->fast_retran_ip = 0;
9593                 if (chk->rec.data.doing_fast_retransmit == 0) {
9594                         /*
9595                          * if no FR in progress skip destination that have
9596                          * flight_size > cwnd.
9597                          */
9598                         if (net->flight_size >= net->cwnd) {
9599                                 continue;
9600                         }
9601                 } else {
9602                         /*
9603                          * Mark the destination net to have FR recovery
9604                          * limits put on it.
9605                          */
9606                         *fr_done = 1;
9607                         net->fast_retran_ip = 1;
9608                 }
9609
9610                 /*
9611                  * if no AUTH is yet included and this chunk requires it,
9612                  * make sure to account for it.  We don't apply the size
9613                  * until the AUTH chunk is actually added below in case
9614                  * there is no room for this chunk.
9615                  */
9616                 if (data_auth_reqd && (auth == NULL)) {
9617                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9618                 } else
9619                         dmtu = 0;
9620
9621                 if ((chk->send_size <= (mtu - dmtu)) ||
9622                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9623                         /* ok we will add this one */
9624                         if (data_auth_reqd) {
9625                                 if (auth == NULL) {
9626                                         m = sctp_add_auth_chunk(m,
9627                                             &endofchain,
9628                                             &auth,
9629                                             &auth_offset,
9630                                             stcb,
9631                                             SCTP_DATA);
9632                                         auth_keyid = chk->auth_keyid;
9633                                         override_ok = 0;
9634                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9635                                 } else if (override_ok) {
9636                                         auth_keyid = chk->auth_keyid;
9637                                         override_ok = 0;
9638                                 } else if (chk->auth_keyid != auth_keyid) {
9639                                         /* different keyid, so done bundling */
9640                                         break;
9641                                 }
9642                         }
9643                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9644                         if (m == NULL) {
9645                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9646                                 return (ENOMEM);
9647                         }
9648                         /* Do clear IP_DF ? */
9649                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9650                                 no_fragmentflg = 0;
9651                         }
9652                         /* upate our MTU size */
9653                         if (mtu > (chk->send_size + dmtu))
9654                                 mtu -= (chk->send_size + dmtu);
9655                         else
9656                                 mtu = 0;
9657                         data_list[bundle_at++] = chk;
9658                         if (one_chunk && (asoc->total_flight <= 0)) {
9659                                 SCTP_STAT_INCR(sctps_windowprobed);
9660                         }
9661                 }
9662                 if (one_chunk == 0) {
9663                         /*
9664                          * now are there anymore forward from chk to pick
9665                          * up?
9666                          */
9667                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9668                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9669                                         /* Nope, not for retran */
9670                                         continue;
9671                                 }
9672                                 if (fwd->whoTo != net) {
9673                                         /* Nope, not the net in question */
9674                                         continue;
9675                                 }
9676                                 if (data_auth_reqd && (auth == NULL)) {
9677                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9678                                 } else
9679                                         dmtu = 0;
9680                                 if (fwd->send_size <= (mtu - dmtu)) {
9681                                         if (data_auth_reqd) {
9682                                                 if (auth == NULL) {
9683                                                         m = sctp_add_auth_chunk(m,
9684                                                             &endofchain,
9685                                                             &auth,
9686                                                             &auth_offset,
9687                                                             stcb,
9688                                                             SCTP_DATA);
9689                                                         auth_keyid = fwd->auth_keyid;
9690                                                         override_ok = 0;
9691                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9692                                                 } else if (override_ok) {
9693                                                         auth_keyid = fwd->auth_keyid;
9694                                                         override_ok = 0;
9695                                                 } else if (fwd->auth_keyid != auth_keyid) {
9696                                                         /*
9697                                                          * different keyid,
9698                                                          * so done bundling
9699                                                          */
9700                                                         break;
9701                                                 }
9702                                         }
9703                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9704                                         if (m == NULL) {
9705                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9706                                                 return (ENOMEM);
9707                                         }
9708                                         /* Do clear IP_DF ? */
9709                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9710                                                 no_fragmentflg = 0;
9711                                         }
9712                                         /* upate our MTU size */
9713                                         if (mtu > (fwd->send_size + dmtu))
9714                                                 mtu -= (fwd->send_size + dmtu);
9715                                         else
9716                                                 mtu = 0;
9717                                         data_list[bundle_at++] = fwd;
9718                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9719                                                 break;
9720                                         }
9721                                 } else {
9722                                         /* can't fit so we are done */
9723                                         break;
9724                                 }
9725                         }
9726                 }
9727                 /* Is there something to send for this destination? */
9728                 if (m) {
9729                         /*
9730                          * No matter if we fail/or suceed we should start a
9731                          * timer. A failure is like a lost IP packet :-)
9732                          */
9733                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9734                                 /*
9735                                  * no timer running on this destination
9736                                  * restart it.
9737                                  */
9738                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9739                                 tmr_started = 1;
9740                         }
9741                         /* Now lets send it, if there is anything to send :> */
9742                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9743                             (struct sockaddr *)&net->ro._l_addr, m,
9744                             auth_offset, auth, auth_keyid,
9745                             no_fragmentflg, 0, 0,
9746                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9747                             net->port, NULL,
9748                             0, 0,
9749                             so_locked))) {
9750                                 /* error, we could not output */
9751                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9752                                 return (error);
9753                         }
9754                         endofchain = NULL;
9755                         auth = NULL;
9756                         auth_offset = 0;
9757                         /* For HB's */
9758                         /*
9759                          * We don't want to mark the net->sent time here
9760                          * since this we use this for HB and retrans cannot
9761                          * measure RTT
9762                          */
9763                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9764
9765                         /* For auto-close */
9766                         cnt_thru++;
9767                         if (*now_filled == 0) {
9768                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9769                                 *now = asoc->time_last_sent;
9770                                 *now_filled = 1;
9771                         } else {
9772                                 asoc->time_last_sent = *now;
9773                         }
9774                         *cnt_out += bundle_at;
9775 #ifdef SCTP_AUDITING_ENABLED
9776                         sctp_audit_log(0xC4, bundle_at);
9777 #endif
9778                         if (bundle_at) {
9779                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9780                         }
9781                         for (i = 0; i < bundle_at; i++) {
9782                                 SCTP_STAT_INCR(sctps_sendretransdata);
9783                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9784                                 /*
9785                                  * When we have a revoked data, and we
9786                                  * retransmit it, then we clear the revoked
9787                                  * flag since this flag dictates if we
9788                                  * subtracted from the fs
9789                                  */
9790                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9791                                         /* Deflate the cwnd */
9792                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9793                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9794                                 }
9795                                 data_list[i]->snd_count++;
9796                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9797                                 /* record the time */
9798                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9799                                 if (data_list[i]->book_size_scale) {
9800                                         /*
9801                                          * need to double the book size on
9802                                          * this one
9803                                          */
9804                                         data_list[i]->book_size_scale = 0;
9805                                         /*
9806                                          * Since we double the booksize, we
9807                                          * must also double the output queue
9808                                          * size, since this get shrunk when
9809                                          * we free by this amount.
9810                                          */
9811                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9812                                         data_list[i]->book_size *= 2;
9813
9814
9815                                 } else {
9816                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9817                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9818                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9819                                         }
9820                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9821                                             (uint32_t) (data_list[i]->send_size +
9822                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9823                                 }
9824                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9825                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9826                                             data_list[i]->whoTo->flight_size,
9827                                             data_list[i]->book_size,
9828                                             (uintptr_t) data_list[i]->whoTo,
9829                                             data_list[i]->rec.data.TSN_seq);
9830                                 }
9831                                 sctp_flight_size_increase(data_list[i]);
9832                                 sctp_total_flight_increase(stcb, data_list[i]);
9833                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9834                                         /* SWS sender side engages */
9835                                         asoc->peers_rwnd = 0;
9836                                 }
9837                                 if ((i == 0) &&
9838                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9839                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9840                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9841                                             (tmr_started == 0)) {
9842                                                 /*-
9843                                                  * ok we just fast-retrans'd
9844                                                  * the lowest TSN, i.e the
9845                                                  * first on the list. In
9846                                                  * this case we want to give
9847                                                  * some more time to get a
9848                                                  * SACK back without a
9849                                                  * t3-expiring.
9850                                                  */
9851                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9852                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9853                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9854                                         }
9855                                 }
9856                         }
9857                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9858                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9859                         }
9860 #ifdef SCTP_AUDITING_ENABLED
9861                         sctp_auditing(21, inp, stcb, NULL);
9862 #endif
9863                 } else {
9864                         /* None will fit */
9865                         return (1);
9866                 }
9867                 if (asoc->sent_queue_retran_cnt <= 0) {
9868                         /* all done we have no more to retran */
9869                         asoc->sent_queue_retran_cnt = 0;
9870                         break;
9871                 }
9872                 if (one_chunk) {
9873                         /* No more room in rwnd */
9874                         return (1);
9875                 }
9876                 /* stop the for loop here. we sent out a packet */
9877                 break;
9878         }
9879         return (0);
9880 }
9881
9882 static void
9883 sctp_timer_validation(struct sctp_inpcb *inp,
9884     struct sctp_tcb *stcb,
9885     struct sctp_association *asoc)
9886 {
9887         struct sctp_nets *net;
9888
9889         /* Validate that a timer is running somewhere */
9890         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9891                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9892                         /* Here is a timer */
9893                         return;
9894                 }
9895         }
9896         SCTP_TCB_LOCK_ASSERT(stcb);
9897         /* Gak, we did not have a timer somewhere */
9898         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9899         if (asoc->alternate) {
9900                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9901         } else {
9902                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9903         }
9904         return;
9905 }
9906
9907 void
9908 sctp_chunk_output(struct sctp_inpcb *inp,
9909     struct sctp_tcb *stcb,
9910     int from_where,
9911     int so_locked
9912 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9913     SCTP_UNUSED
9914 #endif
9915 )
9916 {
9917         /*-
9918          * Ok this is the generic chunk service queue. we must do the
9919          * following:
9920          * - See if there are retransmits pending, if so we must
9921          *   do these first.
9922          * - Service the stream queue that is next, moving any
9923          *   message (note I must get a complete message i.e.
9924          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9925          *   TSN's
9926          * - Check to see if the cwnd/rwnd allows any output, if so we
9927          *   go ahead and fomulate and send the low level chunks. Making sure
9928          *   to combine any control in the control chunk queue also.
9929          */
9930         struct sctp_association *asoc;
9931         struct sctp_nets *net;
9932         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9933         unsigned int burst_cnt = 0;
9934         struct timeval now;
9935         int now_filled = 0;
9936         int nagle_on;
9937         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9938         int un_sent = 0;
9939         int fr_done;
9940         unsigned int tot_frs = 0;
9941
9942         asoc = &stcb->asoc;
9943 do_it_again:
9944         /* The Nagle algorithm is only applied when handling a send call. */
9945         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9946                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9947                         nagle_on = 0;
9948                 } else {
9949                         nagle_on = 1;
9950                 }
9951         } else {
9952                 nagle_on = 0;
9953         }
9954         SCTP_TCB_LOCK_ASSERT(stcb);
9955
9956         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9957
9958         if ((un_sent <= 0) &&
9959             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9960             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9961             (asoc->sent_queue_retran_cnt == 0) &&
9962             (asoc->trigger_reset == 0)) {
9963                 /* Nothing to do unless there is something to be sent left */
9964                 return;
9965         }
9966         /*
9967          * Do we have something to send, data or control AND a sack timer
9968          * running, if so piggy-back the sack.
9969          */
9970         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9971                 sctp_send_sack(stcb, so_locked);
9972                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9973         }
9974         while (asoc->sent_queue_retran_cnt) {
9975                 /*-
9976                  * Ok, it is retransmission time only, we send out only ONE
9977                  * packet with a single call off to the retran code.
9978                  */
9979                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9980                         /*-
9981                          * Special hook for handling cookiess discarded
9982                          * by peer that carried data. Send cookie-ack only
9983                          * and then the next call with get the retran's.
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                         return;
9989                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9990                         /* if its not from a HB then do it */
9991                         fr_done = 0;
9992                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9993                         if (fr_done) {
9994                                 tot_frs++;
9995                         }
9996                 } else {
9997                         /*
9998                          * its from any other place, we don't allow retran
9999                          * output (only control)
10000                          */
10001                         ret = 1;
10002                 }
10003                 if (ret > 0) {
10004                         /* Can't send anymore */
10005                         /*-
10006                          * now lets push out control by calling med-level
10007                          * output once. this assures that we WILL send HB's
10008                          * if queued too.
10009                          */
10010                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10011                             from_where,
10012                             &now, &now_filled, frag_point, so_locked);
10013 #ifdef SCTP_AUDITING_ENABLED
10014                         sctp_auditing(8, inp, stcb, NULL);
10015 #endif
10016                         sctp_timer_validation(inp, stcb, asoc);
10017                         return;
10018                 }
10019                 if (ret < 0) {
10020                         /*-
10021                          * The count was off.. retran is not happening so do
10022                          * the normal retransmission.
10023                          */
10024 #ifdef SCTP_AUDITING_ENABLED
10025                         sctp_auditing(9, inp, stcb, NULL);
10026 #endif
10027                         if (ret == SCTP_RETRAN_EXIT) {
10028                                 return;
10029                         }
10030                         break;
10031                 }
10032                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10033                         /* Only one transmission allowed out of a timeout */
10034 #ifdef SCTP_AUDITING_ENABLED
10035                         sctp_auditing(10, inp, stcb, NULL);
10036 #endif
10037                         /* Push out any control */
10038                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10039                             &now, &now_filled, frag_point, so_locked);
10040                         return;
10041                 }
10042                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10043                         /* Hit FR burst limit */
10044                         return;
10045                 }
10046                 if ((num_out == 0) && (ret == 0)) {
10047                         /* No more retrans to send */
10048                         break;
10049                 }
10050         }
10051 #ifdef SCTP_AUDITING_ENABLED
10052         sctp_auditing(12, inp, stcb, NULL);
10053 #endif
10054         /* Check for bad destinations, if they exist move chunks around. */
10055         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10056                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10057                         /*-
10058                          * if possible move things off of this address we
10059                          * still may send below due to the dormant state but
10060                          * we try to find an alternate address to send to
10061                          * and if we have one we move all queued data on the
10062                          * out wheel to this alternate address.
10063                          */
10064                         if (net->ref_count > 1)
10065                                 sctp_move_chunks_from_net(stcb, net);
10066                 } else {
10067                         /*-
10068                          * if ((asoc->sat_network) || (net->addr_is_local))
10069                          * { burst_limit = asoc->max_burst *
10070                          * SCTP_SAT_NETWORK_BURST_INCR; }
10071                          */
10072                         if (asoc->max_burst > 0) {
10073                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10074                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10075                                                 /*
10076                                                  * JRS - Use the congestion
10077                                                  * control given in the
10078                                                  * congestion control module
10079                                                  */
10080                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10081                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10082                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10083                                                 }
10084                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10085                                         }
10086                                         net->fast_retran_ip = 0;
10087                                 } else {
10088                                         if (net->flight_size == 0) {
10089                                                 /*
10090                                                  * Should be decaying the
10091                                                  * cwnd here
10092                                                  */
10093                                                 ;
10094                                         }
10095                                 }
10096                         }
10097                 }
10098
10099         }
10100         burst_cnt = 0;
10101         do {
10102                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10103                     &reason_code, 0, from_where,
10104                     &now, &now_filled, frag_point, so_locked);
10105                 if (error) {
10106                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10107                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10108                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10109                         }
10110                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10111                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10112                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10113                         }
10114                         break;
10115                 }
10116                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10117
10118                 tot_out += num_out;
10119                 burst_cnt++;
10120                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10121                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10122                         if (num_out == 0) {
10123                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10124                         }
10125                 }
10126                 if (nagle_on) {
10127                         /*
10128                          * When the Nagle algorithm is used, look at how
10129                          * much is unsent, then if its smaller than an MTU
10130                          * and we have data in flight we stop, except if we
10131                          * are handling a fragmented user message.
10132                          */
10133                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10134                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10135                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10136                             (stcb->asoc.total_flight > 0) &&
10137                             ((stcb->asoc.locked_on_sending == NULL) ||
10138                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10139                                 break;
10140                         }
10141                 }
10142                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10143                     TAILQ_EMPTY(&asoc->send_queue) &&
10144                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10145                         /* Nothing left to send */
10146                         break;
10147                 }
10148                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10149                         /* Nothing left to send */
10150                         break;
10151                 }
10152         } while (num_out &&
10153             ((asoc->max_burst == 0) ||
10154             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10155             (burst_cnt < asoc->max_burst)));
10156
10157         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10158                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10159                         SCTP_STAT_INCR(sctps_maxburstqueued);
10160                         asoc->burst_limit_applied = 1;
10161                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10162                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10163                         }
10164                 } else {
10165                         asoc->burst_limit_applied = 0;
10166                 }
10167         }
10168         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10169                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10170         }
10171         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10172             tot_out);
10173
10174         /*-
10175          * Now we need to clean up the control chunk chain if a ECNE is on
10176          * it. It must be marked as UNSENT again so next call will continue
10177          * to send it until such time that we get a CWR, to remove it.
10178          */
10179         if (stcb->asoc.ecn_echo_cnt_onq)
10180                 sctp_fix_ecn_echo(asoc);
10181
10182         if (stcb->asoc.trigger_reset) {
10183                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10184                         goto do_it_again;
10185                 }
10186         }
10187         return;
10188 }
10189
10190
10191 int
10192 sctp_output(
10193     struct sctp_inpcb *inp,
10194     struct mbuf *m,
10195     struct sockaddr *addr,
10196     struct mbuf *control,
10197     struct thread *p,
10198     int flags)
10199 {
10200         if (inp == NULL) {
10201                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10202                 return (EINVAL);
10203         }
10204         if (inp->sctp_socket == NULL) {
10205                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10206                 return (EINVAL);
10207         }
10208         return (sctp_sosend(inp->sctp_socket,
10209             addr,
10210             (struct uio *)NULL,
10211             m,
10212             control,
10213             flags, p
10214             ));
10215 }
10216
10217 void
10218 send_forward_tsn(struct sctp_tcb *stcb,
10219     struct sctp_association *asoc)
10220 {
10221         struct sctp_tmit_chunk *chk;
10222         struct sctp_forward_tsn_chunk *fwdtsn;
10223         uint32_t advance_peer_ack_point;
10224
10225         SCTP_TCB_LOCK_ASSERT(stcb);
10226         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10227                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10228                         /* mark it to unsent */
10229                         chk->sent = SCTP_DATAGRAM_UNSENT;
10230                         chk->snd_count = 0;
10231                         /* Do we correct its output location? */
10232                         if (chk->whoTo) {
10233                                 sctp_free_remote_addr(chk->whoTo);
10234                                 chk->whoTo = NULL;
10235                         }
10236                         goto sctp_fill_in_rest;
10237                 }
10238         }
10239         /* Ok if we reach here we must build one */
10240         sctp_alloc_a_chunk(stcb, chk);
10241         if (chk == NULL) {
10242                 return;
10243         }
10244         asoc->fwd_tsn_cnt++;
10245         chk->copy_by_ref = 0;
10246         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10247         chk->rec.chunk_id.can_take_data = 0;
10248         chk->flags = 0;
10249         chk->asoc = asoc;
10250         chk->whoTo = NULL;
10251         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10252         if (chk->data == NULL) {
10253                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10254                 return;
10255         }
10256         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10257         chk->sent = SCTP_DATAGRAM_UNSENT;
10258         chk->snd_count = 0;
10259         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10260         asoc->ctrl_queue_cnt++;
10261 sctp_fill_in_rest:
10262         /*-
10263          * Here we go through and fill out the part that deals with
10264          * stream/seq of the ones we skip.
10265          */
10266         SCTP_BUF_LEN(chk->data) = 0;
10267         {
10268                 struct sctp_tmit_chunk *at, *tp1, *last;
10269                 struct sctp_strseq *strseq;
10270                 unsigned int cnt_of_space, i, ovh;
10271                 unsigned int space_needed;
10272                 unsigned int cnt_of_skipped = 0;
10273
10274                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10275                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10276                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10277                                 /* no more to look at */
10278                                 break;
10279                         }
10280                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10281                                 /* We don't report these */
10282                                 continue;
10283                         }
10284                         cnt_of_skipped++;
10285                 }
10286                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10287                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10288
10289                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10290
10291                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10292                         ovh = SCTP_MIN_OVERHEAD;
10293                 } else {
10294                         ovh = SCTP_MIN_V4_OVERHEAD;
10295                 }
10296                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10297                         /* trim to a mtu size */
10298                         cnt_of_space = asoc->smallest_mtu - ovh;
10299                 }
10300                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10301                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10302                             0xff, 0, cnt_of_skipped,
10303                             asoc->advanced_peer_ack_point);
10304
10305                 }
10306                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10307                 if (cnt_of_space < space_needed) {
10308                         /*-
10309                          * ok we must trim down the chunk by lowering the
10310                          * advance peer ack point.
10311                          */
10312                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10313                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10314                                     0xff, 0xff, cnt_of_space,
10315                                     space_needed);
10316                         }
10317                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10318                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10319                         /*-
10320                          * Go through and find the TSN that will be the one
10321                          * we report.
10322                          */
10323                         at = TAILQ_FIRST(&asoc->sent_queue);
10324                         if (at != NULL) {
10325                                 for (i = 0; i < cnt_of_skipped; i++) {
10326                                         tp1 = TAILQ_NEXT(at, sctp_next);
10327                                         if (tp1 == NULL) {
10328                                                 break;
10329                                         }
10330                                         at = tp1;
10331                                 }
10332                         }
10333                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10334                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10335                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10336                                     asoc->advanced_peer_ack_point);
10337                         }
10338                         last = at;
10339                         /*-
10340                          * last now points to last one I can report, update
10341                          * peer ack point
10342                          */
10343                         if (last)
10344                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10345                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10346                             cnt_of_skipped * sizeof(struct sctp_strseq);
10347                 }
10348                 chk->send_size = space_needed;
10349                 /* Setup the chunk */
10350                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10351                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10352                 fwdtsn->ch.chunk_flags = 0;
10353                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10354                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10355                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10356                 fwdtsn++;
10357                 /*-
10358                  * Move pointer to after the fwdtsn and transfer to the
10359                  * strseq pointer.
10360                  */
10361                 strseq = (struct sctp_strseq *)fwdtsn;
10362                 /*-
10363                  * Now populate the strseq list. This is done blindly
10364                  * without pulling out duplicate stream info. This is
10365                  * inefficent but won't harm the process since the peer will
10366                  * look at these in sequence and will thus release anything.
10367                  * It could mean we exceed the PMTU and chop off some that
10368                  * we could have included.. but this is unlikely (aka 1432/4
10369                  * would mean 300+ stream seq's would have to be reported in
10370                  * one FWD-TSN. With a bit of work we can later FIX this to
10371                  * optimize and pull out duplcates.. but it does add more
10372                  * overhead. So for now... not!
10373                  */
10374                 at = TAILQ_FIRST(&asoc->sent_queue);
10375                 for (i = 0; i < cnt_of_skipped; i++) {
10376                         tp1 = TAILQ_NEXT(at, sctp_next);
10377                         if (tp1 == NULL)
10378                                 break;
10379                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10380                                 /* We don't report these */
10381                                 i--;
10382                                 at = tp1;
10383                                 continue;
10384                         }
10385                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10386                                 at->rec.data.fwd_tsn_cnt = 0;
10387                         }
10388                         strseq->stream = ntohs(at->rec.data.stream_number);
10389                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10390                         strseq++;
10391                         at = tp1;
10392                 }
10393         }
10394         return;
10395 }
10396
10397 void
10398 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10399 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10400     SCTP_UNUSED
10401 #endif
10402 )
10403 {
10404         /*-
10405          * Queue up a SACK or NR-SACK in the control queue.
10406          * We must first check to see if a SACK or NR-SACK is
10407          * somehow on the control queue.
10408          * If so, we will take and and remove the old one.
10409          */
10410         struct sctp_association *asoc;
10411         struct sctp_tmit_chunk *chk, *a_chk;
10412         struct sctp_sack_chunk *sack;
10413         struct sctp_nr_sack_chunk *nr_sack;
10414         struct sctp_gap_ack_block *gap_descriptor;
10415         struct sack_track *selector;
10416         int mergeable = 0;
10417         int offset;
10418         caddr_t limit;
10419         uint32_t *dup;
10420         int limit_reached = 0;
10421         unsigned int i, siz, j;
10422         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10423         int num_dups = 0;
10424         int space_req;
10425         uint32_t highest_tsn;
10426         uint8_t flags;
10427         uint8_t type;
10428         uint8_t tsn_map;
10429
10430         if (stcb->asoc.nrsack_supported == 1) {
10431                 type = SCTP_NR_SELECTIVE_ACK;
10432         } else {
10433                 type = SCTP_SELECTIVE_ACK;
10434         }
10435         a_chk = NULL;
10436         asoc = &stcb->asoc;
10437         SCTP_TCB_LOCK_ASSERT(stcb);
10438         if (asoc->last_data_chunk_from == NULL) {
10439                 /* Hmm we never received anything */
10440                 return;
10441         }
10442         sctp_slide_mapping_arrays(stcb);
10443         sctp_set_rwnd(stcb, asoc);
10444         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10445                 if (chk->rec.chunk_id.id == type) {
10446                         /* Hmm, found a sack already on queue, remove it */
10447                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10448                         asoc->ctrl_queue_cnt--;
10449                         a_chk = chk;
10450                         if (a_chk->data) {
10451                                 sctp_m_freem(a_chk->data);
10452                                 a_chk->data = NULL;
10453                         }
10454                         if (a_chk->whoTo) {
10455                                 sctp_free_remote_addr(a_chk->whoTo);
10456                                 a_chk->whoTo = NULL;
10457                         }
10458                         break;
10459                 }
10460         }
10461         if (a_chk == NULL) {
10462                 sctp_alloc_a_chunk(stcb, a_chk);
10463                 if (a_chk == NULL) {
10464                         /* No memory so we drop the idea, and set a timer */
10465                         if (stcb->asoc.delayed_ack) {
10466                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10467                                     stcb->sctp_ep, stcb, NULL,
10468                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10469                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10470                                     stcb->sctp_ep, stcb, NULL);
10471                         } else {
10472                                 stcb->asoc.send_sack = 1;
10473                         }
10474                         return;
10475                 }
10476                 a_chk->copy_by_ref = 0;
10477                 a_chk->rec.chunk_id.id = type;
10478                 a_chk->rec.chunk_id.can_take_data = 1;
10479         }
10480         /* Clear our pkt counts */
10481         asoc->data_pkts_seen = 0;
10482
10483         a_chk->flags = 0;
10484         a_chk->asoc = asoc;
10485         a_chk->snd_count = 0;
10486         a_chk->send_size = 0;   /* fill in later */
10487         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10488         a_chk->whoTo = NULL;
10489
10490         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10491                 /*-
10492                  * Ok, the destination for the SACK is unreachable, lets see if
10493                  * we can select an alternate to asoc->last_data_chunk_from
10494                  */
10495                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10496                 if (a_chk->whoTo == NULL) {
10497                         /* Nope, no alternate */
10498                         a_chk->whoTo = asoc->last_data_chunk_from;
10499                 }
10500         } else {
10501                 a_chk->whoTo = asoc->last_data_chunk_from;
10502         }
10503         if (a_chk->whoTo) {
10504                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10505         }
10506         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10507                 highest_tsn = asoc->highest_tsn_inside_map;
10508         } else {
10509                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10510         }
10511         if (highest_tsn == asoc->cumulative_tsn) {
10512                 /* no gaps */
10513                 if (type == SCTP_SELECTIVE_ACK) {
10514                         space_req = sizeof(struct sctp_sack_chunk);
10515                 } else {
10516                         space_req = sizeof(struct sctp_nr_sack_chunk);
10517                 }
10518         } else {
10519                 /* gaps get a cluster */
10520                 space_req = MCLBYTES;
10521         }
10522         /* Ok now lets formulate a MBUF with our sack */
10523         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10524         if ((a_chk->data == NULL) ||
10525             (a_chk->whoTo == NULL)) {
10526                 /* rats, no mbuf memory */
10527                 if (a_chk->data) {
10528                         /* was a problem with the destination */
10529                         sctp_m_freem(a_chk->data);
10530                         a_chk->data = NULL;
10531                 }
10532                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10533                 /* sa_ignore NO_NULL_CHK */
10534                 if (stcb->asoc.delayed_ack) {
10535                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10536                             stcb->sctp_ep, stcb, NULL,
10537                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10538                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10539                             stcb->sctp_ep, stcb, NULL);
10540                 } else {
10541                         stcb->asoc.send_sack = 1;
10542                 }
10543                 return;
10544         }
10545         /* ok, lets go through and fill it in */
10546         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10547         space = M_TRAILINGSPACE(a_chk->data);
10548         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10549                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10550         }
10551         limit = mtod(a_chk->data, caddr_t);
10552         limit += space;
10553
10554         flags = 0;
10555
10556         if ((asoc->sctp_cmt_on_off > 0) &&
10557             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10558                 /*-
10559                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10560                  * received, then set high bit to 1, else 0. Reset
10561                  * pkts_rcvd.
10562                  */
10563                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10564                 asoc->cmt_dac_pkts_rcvd = 0;
10565         }
10566 #ifdef SCTP_ASOCLOG_OF_TSNS
10567         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10568         stcb->asoc.cumack_log_atsnt++;
10569         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10570                 stcb->asoc.cumack_log_atsnt = 0;
10571         }
10572 #endif
10573         /* reset the readers interpretation */
10574         stcb->freed_by_sorcv_sincelast = 0;
10575
10576         if (type == SCTP_SELECTIVE_ACK) {
10577                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10578                 nr_sack = NULL;
10579                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10580                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10581                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10582                 } else {
10583                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10584                 }
10585         } else {
10586                 sack = NULL;
10587                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10588                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10589                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10590                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10591                 } else {
10592                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10593                 }
10594         }
10595
10596         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10597                 offset = 1;
10598         } else {
10599                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10600         }
10601         if (((type == SCTP_SELECTIVE_ACK) &&
10602             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10603             ((type == SCTP_NR_SELECTIVE_ACK) &&
10604             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10605                 /* we have a gap .. maybe */
10606                 for (i = 0; i < siz; i++) {
10607                         tsn_map = asoc->mapping_array[i];
10608                         if (type == SCTP_SELECTIVE_ACK) {
10609                                 tsn_map |= asoc->nr_mapping_array[i];
10610                         }
10611                         if (i == 0) {
10612                                 /*
10613                                  * Clear all bits corresponding to TSNs
10614                                  * smaller or equal to the cumulative TSN.
10615                                  */
10616                                 tsn_map &= (~0 << (1 - offset));
10617                         }
10618                         selector = &sack_array[tsn_map];
10619                         if (mergeable && selector->right_edge) {
10620                                 /*
10621                                  * Backup, left and right edges were ok to
10622                                  * merge.
10623                                  */
10624                                 num_gap_blocks--;
10625                                 gap_descriptor--;
10626                         }
10627                         if (selector->num_entries == 0)
10628                                 mergeable = 0;
10629                         else {
10630                                 for (j = 0; j < selector->num_entries; j++) {
10631                                         if (mergeable && selector->right_edge) {
10632                                                 /*
10633                                                  * do a merge by NOT setting
10634                                                  * the left side
10635                                                  */
10636                                                 mergeable = 0;
10637                                         } else {
10638                                                 /*
10639                                                  * no merge, set the left
10640                                                  * side
10641                                                  */
10642                                                 mergeable = 0;
10643                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10644                                         }
10645                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10646                                         num_gap_blocks++;
10647                                         gap_descriptor++;
10648                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10649                                                 /* no more room */
10650                                                 limit_reached = 1;
10651                                                 break;
10652                                         }
10653                                 }
10654                                 if (selector->left_edge) {
10655                                         mergeable = 1;
10656                                 }
10657                         }
10658                         if (limit_reached) {
10659                                 /* Reached the limit stop */
10660                                 break;
10661                         }
10662                         offset += 8;
10663                 }
10664         }
10665         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10666             (limit_reached == 0)) {
10667
10668                 mergeable = 0;
10669
10670                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10671                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10672                 } else {
10673                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10674                 }
10675
10676                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10677                         offset = 1;
10678                 } else {
10679                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10680                 }
10681                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10682                         /* we have a gap .. maybe */
10683                         for (i = 0; i < siz; i++) {
10684                                 tsn_map = asoc->nr_mapping_array[i];
10685                                 if (i == 0) {
10686                                         /*
10687                                          * Clear all bits corresponding to
10688                                          * TSNs smaller or equal to the
10689                                          * cumulative TSN.
10690                                          */
10691                                         tsn_map &= (~0 << (1 - offset));
10692                                 }
10693                                 selector = &sack_array[tsn_map];
10694                                 if (mergeable && selector->right_edge) {
10695                                         /*
10696                                          * Backup, left and right edges were
10697                                          * ok to merge.
10698                                          */
10699                                         num_nr_gap_blocks--;
10700                                         gap_descriptor--;
10701                                 }
10702                                 if (selector->num_entries == 0)
10703                                         mergeable = 0;
10704                                 else {
10705                                         for (j = 0; j < selector->num_entries; j++) {
10706                                                 if (mergeable && selector->right_edge) {
10707                                                         /*
10708                                                          * do a merge by NOT
10709                                                          * setting the left
10710                                                          * side
10711                                                          */
10712                                                         mergeable = 0;
10713                                                 } else {
10714                                                         /*
10715                                                          * no merge, set the
10716                                                          * left side
10717                                                          */
10718                                                         mergeable = 0;
10719                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10720                                                 }
10721                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10722                                                 num_nr_gap_blocks++;
10723                                                 gap_descriptor++;
10724                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10725                                                         /* no more room */
10726                                                         limit_reached = 1;
10727                                                         break;
10728                                                 }
10729                                         }
10730                                         if (selector->left_edge) {
10731                                                 mergeable = 1;
10732                                         }
10733                                 }
10734                                 if (limit_reached) {
10735                                         /* Reached the limit stop */
10736                                         break;
10737                                 }
10738                                 offset += 8;
10739                         }
10740                 }
10741         }
10742         /* now we must add any dups we are going to report. */
10743         if ((limit_reached == 0) && (asoc->numduptsns)) {
10744                 dup = (uint32_t *) gap_descriptor;
10745                 for (i = 0; i < asoc->numduptsns; i++) {
10746                         *dup = htonl(asoc->dup_tsns[i]);
10747                         dup++;
10748                         num_dups++;
10749                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10750                                 /* no more room */
10751                                 break;
10752                         }
10753                 }
10754                 asoc->numduptsns = 0;
10755         }
10756         /*
10757          * now that the chunk is prepared queue it to the control chunk
10758          * queue.
10759          */
10760         if (type == SCTP_SELECTIVE_ACK) {
10761                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10762                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10763                     num_dups * sizeof(int32_t);
10764                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10765                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10766                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10767                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10768                 sack->sack.num_dup_tsns = htons(num_dups);
10769                 sack->ch.chunk_type = type;
10770                 sack->ch.chunk_flags = flags;
10771                 sack->ch.chunk_length = htons(a_chk->send_size);
10772         } else {
10773                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10774                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10775                     num_dups * sizeof(int32_t);
10776                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10777                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10778                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10779                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10780                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10781                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10782                 nr_sack->nr_sack.reserved = 0;
10783                 nr_sack->ch.chunk_type = type;
10784                 nr_sack->ch.chunk_flags = flags;
10785                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10786         }
10787         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10788         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10789         asoc->ctrl_queue_cnt++;
10790         asoc->send_sack = 0;
10791         SCTP_STAT_INCR(sctps_sendsacks);
10792         return;
10793 }
10794
10795 void
10796 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10797 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10798     SCTP_UNUSED
10799 #endif
10800 )
10801 {
10802         struct mbuf *m_abort, *m, *m_last;
10803         struct mbuf *m_out, *m_end = NULL;
10804         struct sctp_abort_chunk *abort;
10805         struct sctp_auth_chunk *auth = NULL;
10806         struct sctp_nets *net;
10807         uint32_t vtag;
10808         uint32_t auth_offset = 0;
10809         uint16_t cause_len, chunk_len, padding_len;
10810
10811         SCTP_TCB_LOCK_ASSERT(stcb);
10812         /*-
10813          * Add an AUTH chunk, if chunk requires it and save the offset into
10814          * the chain for AUTH
10815          */
10816         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10817             stcb->asoc.peer_auth_chunks)) {
10818                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10819                     stcb, SCTP_ABORT_ASSOCIATION);
10820                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10821         } else {
10822                 m_out = NULL;
10823         }
10824         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10825         if (m_abort == NULL) {
10826                 if (m_out) {
10827                         sctp_m_freem(m_out);
10828                 }
10829                 if (operr) {
10830                         sctp_m_freem(operr);
10831                 }
10832                 return;
10833         }
10834         /* link in any error */
10835         SCTP_BUF_NEXT(m_abort) = operr;
10836         cause_len = 0;
10837         m_last = NULL;
10838         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10839                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10840                 if (SCTP_BUF_NEXT(m) == NULL) {
10841                         m_last = m;
10842                 }
10843         }
10844         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10845         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10846         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10847         if (m_out == NULL) {
10848                 /* NO Auth chunk prepended, so reserve space in front */
10849                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10850                 m_out = m_abort;
10851         } else {
10852                 /* Put AUTH chunk at the front of the chain */
10853                 SCTP_BUF_NEXT(m_end) = m_abort;
10854         }
10855         if (stcb->asoc.alternate) {
10856                 net = stcb->asoc.alternate;
10857         } else {
10858                 net = stcb->asoc.primary_destination;
10859         }
10860         /* Fill in the ABORT chunk header. */
10861         abort = mtod(m_abort, struct sctp_abort_chunk *);
10862         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10863         if (stcb->asoc.peer_vtag == 0) {
10864                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10865                 vtag = stcb->asoc.my_vtag;
10866                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10867         } else {
10868                 vtag = stcb->asoc.peer_vtag;
10869                 abort->ch.chunk_flags = 0;
10870         }
10871         abort->ch.chunk_length = htons(chunk_len);
10872         /* Add padding, if necessary. */
10873         if (padding_len > 0) {
10874                 if ((m_last == NULL) ||
10875                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10876                         sctp_m_freem(m_out);
10877                         return;
10878                 }
10879         }
10880         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10881             (struct sockaddr *)&net->ro._l_addr,
10882             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10883             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10884             stcb->asoc.primary_destination->port, NULL,
10885             0, 0,
10886             so_locked);
10887         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10888 }
10889
10890 void
10891 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10892     struct sctp_nets *net,
10893     int reflect_vtag)
10894 {
10895         /* formulate and SEND a SHUTDOWN-COMPLETE */
10896         struct mbuf *m_shutdown_comp;
10897         struct sctp_shutdown_complete_chunk *shutdown_complete;
10898         uint32_t vtag;
10899         uint8_t flags;
10900
10901         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10902         if (m_shutdown_comp == NULL) {
10903                 /* no mbuf's */
10904                 return;
10905         }
10906         if (reflect_vtag) {
10907                 flags = SCTP_HAD_NO_TCB;
10908                 vtag = stcb->asoc.my_vtag;
10909         } else {
10910                 flags = 0;
10911                 vtag = stcb->asoc.peer_vtag;
10912         }
10913         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10914         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10915         shutdown_complete->ch.chunk_flags = flags;
10916         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10917         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10918         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10919             (struct sockaddr *)&net->ro._l_addr,
10920             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10921             stcb->sctp_ep->sctp_lport, stcb->rport,
10922             htonl(vtag),
10923             net->port, NULL,
10924             0, 0,
10925             SCTP_SO_NOT_LOCKED);
10926         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10927         return;
10928 }
10929
10930 static void
10931 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10932     struct sctphdr *sh, uint32_t vtag,
10933     uint8_t type, struct mbuf *cause,
10934     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10935     uint32_t vrf_id, uint16_t port)
10936 {
10937         struct mbuf *o_pak;
10938         struct mbuf *mout;
10939         struct sctphdr *shout;
10940         struct sctp_chunkhdr *ch;
10941
10942 #if defined(INET) || defined(INET6)
10943         struct udphdr *udp;
10944         int ret;
10945
10946 #endif
10947         int len, cause_len, padding_len;
10948
10949 #ifdef INET
10950         struct sockaddr_in *src_sin, *dst_sin;
10951         struct ip *ip;
10952
10953 #endif
10954 #ifdef INET6
10955         struct sockaddr_in6 *src_sin6, *dst_sin6;
10956         struct ip6_hdr *ip6;
10957
10958 #endif
10959
10960         /* Compute the length of the cause and add final padding. */
10961         cause_len = 0;
10962         if (cause != NULL) {
10963                 struct mbuf *m_at, *m_last = NULL;
10964
10965                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10966                         if (SCTP_BUF_NEXT(m_at) == NULL)
10967                                 m_last = m_at;
10968                         cause_len += SCTP_BUF_LEN(m_at);
10969                 }
10970                 padding_len = cause_len % 4;
10971                 if (padding_len != 0) {
10972                         padding_len = 4 - padding_len;
10973                 }
10974                 if (padding_len != 0) {
10975                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10976                                 sctp_m_freem(cause);
10977                                 return;
10978                         }
10979                 }
10980         } else {
10981                 padding_len = 0;
10982         }
10983         /* Get an mbuf for the header. */
10984         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10985         switch (dst->sa_family) {
10986 #ifdef INET
10987         case AF_INET:
10988                 len += sizeof(struct ip);
10989                 break;
10990 #endif
10991 #ifdef INET6
10992         case AF_INET6:
10993                 len += sizeof(struct ip6_hdr);
10994                 break;
10995 #endif
10996         default:
10997                 break;
10998         }
10999 #if defined(INET) || defined(INET6)
11000         if (port) {
11001                 len += sizeof(struct udphdr);
11002         }
11003 #endif
11004         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11005         if (mout == NULL) {
11006                 if (cause) {
11007                         sctp_m_freem(cause);
11008                 }
11009                 return;
11010         }
11011         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11012         SCTP_BUF_LEN(mout) = len;
11013         SCTP_BUF_NEXT(mout) = cause;
11014         M_SETFIB(mout, fibnum);
11015         mout->m_pkthdr.flowid = mflowid;
11016         M_HASHTYPE_SET(mout, mflowtype);
11017 #ifdef INET
11018         ip = NULL;
11019 #endif
11020 #ifdef INET6
11021         ip6 = NULL;
11022 #endif
11023         switch (dst->sa_family) {
11024 #ifdef INET
11025         case AF_INET:
11026                 src_sin = (struct sockaddr_in *)src;
11027                 dst_sin = (struct sockaddr_in *)dst;
11028                 ip = mtod(mout, struct ip *);
11029                 ip->ip_v = IPVERSION;
11030                 ip->ip_hl = (sizeof(struct ip) >> 2);
11031                 ip->ip_tos = 0;
11032                 ip->ip_off = 0;
11033                 ip_fillid(ip);
11034                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11035                 if (port) {
11036                         ip->ip_p = IPPROTO_UDP;
11037                 } else {
11038                         ip->ip_p = IPPROTO_SCTP;
11039                 }
11040                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11041                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11042                 ip->ip_sum = 0;
11043                 len = sizeof(struct ip);
11044                 shout = (struct sctphdr *)((caddr_t)ip + len);
11045                 break;
11046 #endif
11047 #ifdef INET6
11048         case AF_INET6:
11049                 src_sin6 = (struct sockaddr_in6 *)src;
11050                 dst_sin6 = (struct sockaddr_in6 *)dst;
11051                 ip6 = mtod(mout, struct ip6_hdr *);
11052                 ip6->ip6_flow = htonl(0x60000000);
11053                 if (V_ip6_auto_flowlabel) {
11054                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11055                 }
11056                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11057                 if (port) {
11058                         ip6->ip6_nxt = IPPROTO_UDP;
11059                 } else {
11060                         ip6->ip6_nxt = IPPROTO_SCTP;
11061                 }
11062                 ip6->ip6_src = dst_sin6->sin6_addr;
11063                 ip6->ip6_dst = src_sin6->sin6_addr;
11064                 len = sizeof(struct ip6_hdr);
11065                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11066                 break;
11067 #endif
11068         default:
11069                 len = 0;
11070                 shout = mtod(mout, struct sctphdr *);
11071                 break;
11072         }
11073 #if defined(INET) || defined(INET6)
11074         if (port) {
11075                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11076                         sctp_m_freem(mout);
11077                         return;
11078                 }
11079                 udp = (struct udphdr *)shout;
11080                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11081                 udp->uh_dport = port;
11082                 udp->uh_sum = 0;
11083                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11084                     sizeof(struct sctphdr) +
11085                     sizeof(struct sctp_chunkhdr) +
11086                     cause_len + padding_len);
11087                 len += sizeof(struct udphdr);
11088                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11089         } else {
11090                 udp = NULL;
11091         }
11092 #endif
11093         shout->src_port = sh->dest_port;
11094         shout->dest_port = sh->src_port;
11095         shout->checksum = 0;
11096         if (vtag) {
11097                 shout->v_tag = htonl(vtag);
11098         } else {
11099                 shout->v_tag = sh->v_tag;
11100         }
11101         len += sizeof(struct sctphdr);
11102         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11103         ch->chunk_type = type;
11104         if (vtag) {
11105                 ch->chunk_flags = 0;
11106         } else {
11107                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11108         }
11109         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11110         len += sizeof(struct sctp_chunkhdr);
11111         len += cause_len + padding_len;
11112
11113         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11114                 sctp_m_freem(mout);
11115                 return;
11116         }
11117         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11118         switch (dst->sa_family) {
11119 #ifdef INET
11120         case AF_INET:
11121                 if (port) {
11122                         if (V_udp_cksum) {
11123                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11124                         } else {
11125                                 udp->uh_sum = 0;
11126                         }
11127                 }
11128                 ip->ip_len = htons(len);
11129                 if (port) {
11130 #if defined(SCTP_WITH_NO_CSUM)
11131                         SCTP_STAT_INCR(sctps_sendnocrc);
11132 #else
11133                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11134                         SCTP_STAT_INCR(sctps_sendswcrc);
11135 #endif
11136                         if (V_udp_cksum) {
11137                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11138                         }
11139                 } else {
11140 #if defined(SCTP_WITH_NO_CSUM)
11141                         SCTP_STAT_INCR(sctps_sendnocrc);
11142 #else
11143                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11144                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11145                         SCTP_STAT_INCR(sctps_sendhwcrc);
11146 #endif
11147                 }
11148 #ifdef SCTP_PACKET_LOGGING
11149                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11150                         sctp_packet_log(o_pak);
11151                 }
11152 #endif
11153                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11154                 break;
11155 #endif
11156 #ifdef INET6
11157         case AF_INET6:
11158                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11159                 if (port) {
11160 #if defined(SCTP_WITH_NO_CSUM)
11161                         SCTP_STAT_INCR(sctps_sendnocrc);
11162 #else
11163                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11164                         SCTP_STAT_INCR(sctps_sendswcrc);
11165 #endif
11166                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11167                                 udp->uh_sum = 0xffff;
11168                         }
11169                 } else {
11170 #if defined(SCTP_WITH_NO_CSUM)
11171                         SCTP_STAT_INCR(sctps_sendnocrc);
11172 #else
11173                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11174                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11175                         SCTP_STAT_INCR(sctps_sendhwcrc);
11176 #endif
11177                 }
11178 #ifdef SCTP_PACKET_LOGGING
11179                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11180                         sctp_packet_log(o_pak);
11181                 }
11182 #endif
11183                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11184                 break;
11185 #endif
11186         default:
11187                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11188                     dst->sa_family);
11189                 sctp_m_freem(mout);
11190                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11191                 return;
11192         }
11193         SCTP_STAT_INCR(sctps_sendpackets);
11194         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11195         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11196         return;
11197 }
11198
11199 void
11200 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11201     struct sctphdr *sh,
11202     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11203     uint32_t vrf_id, uint16_t port)
11204 {
11205         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11206             mflowtype, mflowid, fibnum,
11207             vrf_id, port);
11208 }
11209
11210 void
11211 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11212 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11213     SCTP_UNUSED
11214 #endif
11215 )
11216 {
11217         struct sctp_tmit_chunk *chk;
11218         struct sctp_heartbeat_chunk *hb;
11219         struct timeval now;
11220
11221         SCTP_TCB_LOCK_ASSERT(stcb);
11222         if (net == NULL) {
11223                 return;
11224         }
11225         (void)SCTP_GETTIME_TIMEVAL(&now);
11226         switch (net->ro._l_addr.sa.sa_family) {
11227 #ifdef INET
11228         case AF_INET:
11229                 break;
11230 #endif
11231 #ifdef INET6
11232         case AF_INET6:
11233                 break;
11234 #endif
11235         default:
11236                 return;
11237         }
11238         sctp_alloc_a_chunk(stcb, chk);
11239         if (chk == NULL) {
11240                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11241                 return;
11242         }
11243         chk->copy_by_ref = 0;
11244         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11245         chk->rec.chunk_id.can_take_data = 1;
11246         chk->flags = 0;
11247         chk->asoc = &stcb->asoc;
11248         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11249
11250         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11251         if (chk->data == NULL) {
11252                 sctp_free_a_chunk(stcb, chk, so_locked);
11253                 return;
11254         }
11255         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11256         SCTP_BUF_LEN(chk->data) = chk->send_size;
11257         chk->sent = SCTP_DATAGRAM_UNSENT;
11258         chk->snd_count = 0;
11259         chk->whoTo = net;
11260         atomic_add_int(&chk->whoTo->ref_count, 1);
11261         /* Now we have a mbuf that we can fill in with the details */
11262         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11263         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11264         /* fill out chunk header */
11265         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11266         hb->ch.chunk_flags = 0;
11267         hb->ch.chunk_length = htons(chk->send_size);
11268         /* Fill out hb parameter */
11269         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11270         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11271         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11272         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11273         /* Did our user request this one, put it in */
11274         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11275         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11276         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11277                 /*
11278                  * we only take from the entropy pool if the address is not
11279                  * confirmed.
11280                  */
11281                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11282                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11283         } else {
11284                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11285                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11286         }
11287         switch (net->ro._l_addr.sa.sa_family) {
11288 #ifdef INET
11289         case AF_INET:
11290                 memcpy(hb->heartbeat.hb_info.address,
11291                     &net->ro._l_addr.sin.sin_addr,
11292                     sizeof(net->ro._l_addr.sin.sin_addr));
11293                 break;
11294 #endif
11295 #ifdef INET6
11296         case AF_INET6:
11297                 memcpy(hb->heartbeat.hb_info.address,
11298                     &net->ro._l_addr.sin6.sin6_addr,
11299                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11300                 break;
11301 #endif
11302         default:
11303                 if (chk->data) {
11304                         sctp_m_freem(chk->data);
11305                         chk->data = NULL;
11306                 }
11307                 sctp_free_a_chunk(stcb, chk, so_locked);
11308                 return;
11309                 break;
11310         }
11311         net->hb_responded = 0;
11312         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11313         stcb->asoc.ctrl_queue_cnt++;
11314         SCTP_STAT_INCR(sctps_sendheartbeat);
11315         return;
11316 }
11317
11318 void
11319 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11320     uint32_t high_tsn)
11321 {
11322         struct sctp_association *asoc;
11323         struct sctp_ecne_chunk *ecne;
11324         struct sctp_tmit_chunk *chk;
11325
11326         if (net == NULL) {
11327                 return;
11328         }
11329         asoc = &stcb->asoc;
11330         SCTP_TCB_LOCK_ASSERT(stcb);
11331         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11332                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11333                         /* found a previous ECN_ECHO update it if needed */
11334                         uint32_t cnt, ctsn;
11335
11336                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11337                         ctsn = ntohl(ecne->tsn);
11338                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11339                                 ecne->tsn = htonl(high_tsn);
11340                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11341                         }
11342                         cnt = ntohl(ecne->num_pkts_since_cwr);
11343                         cnt++;
11344                         ecne->num_pkts_since_cwr = htonl(cnt);
11345                         return;
11346                 }
11347         }
11348         /* nope could not find one to update so we must build one */
11349         sctp_alloc_a_chunk(stcb, chk);
11350         if (chk == NULL) {
11351                 return;
11352         }
11353         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11354         chk->copy_by_ref = 0;
11355         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11356         chk->rec.chunk_id.can_take_data = 0;
11357         chk->flags = 0;
11358         chk->asoc = &stcb->asoc;
11359         chk->send_size = sizeof(struct sctp_ecne_chunk);
11360         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11361         if (chk->data == NULL) {
11362                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11363                 return;
11364         }
11365         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11366         SCTP_BUF_LEN(chk->data) = chk->send_size;
11367         chk->sent = SCTP_DATAGRAM_UNSENT;
11368         chk->snd_count = 0;
11369         chk->whoTo = net;
11370         atomic_add_int(&chk->whoTo->ref_count, 1);
11371
11372         stcb->asoc.ecn_echo_cnt_onq++;
11373         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11374         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11375         ecne->ch.chunk_flags = 0;
11376         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11377         ecne->tsn = htonl(high_tsn);
11378         ecne->num_pkts_since_cwr = htonl(1);
11379         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11380         asoc->ctrl_queue_cnt++;
11381 }
11382
11383 void
11384 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11385     struct mbuf *m, int len, int iphlen, int bad_crc)
11386 {
11387         struct sctp_association *asoc;
11388         struct sctp_pktdrop_chunk *drp;
11389         struct sctp_tmit_chunk *chk;
11390         uint8_t *datap;
11391         int was_trunc = 0;
11392         int fullsz = 0;
11393         long spc;
11394         int offset;
11395         struct sctp_chunkhdr *ch, chunk_buf;
11396         unsigned int chk_length;
11397
11398         if (!stcb) {
11399                 return;
11400         }
11401         asoc = &stcb->asoc;
11402         SCTP_TCB_LOCK_ASSERT(stcb);
11403         if (asoc->pktdrop_supported == 0) {
11404                 /*-
11405                  * peer must declare support before I send one.
11406                  */
11407                 return;
11408         }
11409         if (stcb->sctp_socket == NULL) {
11410                 return;
11411         }
11412         sctp_alloc_a_chunk(stcb, chk);
11413         if (chk == NULL) {
11414                 return;
11415         }
11416         chk->copy_by_ref = 0;
11417         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11418         chk->rec.chunk_id.can_take_data = 1;
11419         chk->flags = 0;
11420         len -= iphlen;
11421         chk->send_size = len;
11422         /* Validate that we do not have an ABORT in here. */
11423         offset = iphlen + sizeof(struct sctphdr);
11424         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11425             sizeof(*ch), (uint8_t *) & chunk_buf);
11426         while (ch != NULL) {
11427                 chk_length = ntohs(ch->chunk_length);
11428                 if (chk_length < sizeof(*ch)) {
11429                         /* break to abort land */
11430                         break;
11431                 }
11432                 switch (ch->chunk_type) {
11433                 case SCTP_PACKET_DROPPED:
11434                 case SCTP_ABORT_ASSOCIATION:
11435                 case SCTP_INITIATION_ACK:
11436                         /**
11437                          * We don't respond with an PKT-DROP to an ABORT
11438                          * or PKT-DROP. We also do not respond to an
11439                          * INIT-ACK, because we can't know if the initiation
11440                          * tag is correct or not.
11441                          */
11442                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11443                         return;
11444                 default:
11445                         break;
11446                 }
11447                 offset += SCTP_SIZE32(chk_length);
11448                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11449                     sizeof(*ch), (uint8_t *) & chunk_buf);
11450         }
11451
11452         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11453             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11454                 /*
11455                  * only send 1 mtu worth, trim off the excess on the end.
11456                  */
11457                 fullsz = len;
11458                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11459                 was_trunc = 1;
11460         }
11461         chk->asoc = &stcb->asoc;
11462         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11463         if (chk->data == NULL) {
11464 jump_out:
11465                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11466                 return;
11467         }
11468         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11469         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11470         if (drp == NULL) {
11471                 sctp_m_freem(chk->data);
11472                 chk->data = NULL;
11473                 goto jump_out;
11474         }
11475         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11476             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11477         chk->book_size_scale = 0;
11478         if (was_trunc) {
11479                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11480                 drp->trunc_len = htons(fullsz);
11481                 /*
11482                  * Len is already adjusted to size minus overhead above take
11483                  * out the pkt_drop chunk itself from it.
11484                  */
11485                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11486                 len = chk->send_size;
11487         } else {
11488                 /* no truncation needed */
11489                 drp->ch.chunk_flags = 0;
11490                 drp->trunc_len = htons(0);
11491         }
11492         if (bad_crc) {
11493                 drp->ch.chunk_flags |= SCTP_BADCRC;
11494         }
11495         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11496         SCTP_BUF_LEN(chk->data) = chk->send_size;
11497         chk->sent = SCTP_DATAGRAM_UNSENT;
11498         chk->snd_count = 0;
11499         if (net) {
11500                 /* we should hit here */
11501                 chk->whoTo = net;
11502                 atomic_add_int(&chk->whoTo->ref_count, 1);
11503         } else {
11504                 chk->whoTo = NULL;
11505         }
11506         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11507         drp->ch.chunk_length = htons(chk->send_size);
11508         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11509         if (spc < 0) {
11510                 spc = 0;
11511         }
11512         drp->bottle_bw = htonl(spc);
11513         if (asoc->my_rwnd) {
11514                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11515                     asoc->size_on_all_streams +
11516                     asoc->my_rwnd_control_len +
11517                     stcb->sctp_socket->so_rcv.sb_cc);
11518         } else {
11519                 /*-
11520                  * If my rwnd is 0, possibly from mbuf depletion as well as
11521                  * space used, tell the peer there is NO space aka onq == bw
11522                  */
11523                 drp->current_onq = htonl(spc);
11524         }
11525         drp->reserved = 0;
11526         datap = drp->data;
11527         m_copydata(m, iphlen, len, (caddr_t)datap);
11528         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11529         asoc->ctrl_queue_cnt++;
11530 }
11531
11532 void
11533 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11534 {
11535         struct sctp_association *asoc;
11536         struct sctp_cwr_chunk *cwr;
11537         struct sctp_tmit_chunk *chk;
11538
11539         SCTP_TCB_LOCK_ASSERT(stcb);
11540         if (net == NULL) {
11541                 return;
11542         }
11543         asoc = &stcb->asoc;
11544         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11545                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11546                         /*
11547                          * found a previous CWR queued to same destination
11548                          * update it if needed
11549                          */
11550                         uint32_t ctsn;
11551
11552                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11553                         ctsn = ntohl(cwr->tsn);
11554                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11555                                 cwr->tsn = htonl(high_tsn);
11556                         }
11557                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11558                                 /* Make sure override is carried */
11559                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11560                         }
11561                         return;
11562                 }
11563         }
11564         sctp_alloc_a_chunk(stcb, chk);
11565         if (chk == NULL) {
11566                 return;
11567         }
11568         chk->copy_by_ref = 0;
11569         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11570         chk->rec.chunk_id.can_take_data = 1;
11571         chk->flags = 0;
11572         chk->asoc = &stcb->asoc;
11573         chk->send_size = sizeof(struct sctp_cwr_chunk);
11574         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11575         if (chk->data == NULL) {
11576                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11577                 return;
11578         }
11579         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11580         SCTP_BUF_LEN(chk->data) = chk->send_size;
11581         chk->sent = SCTP_DATAGRAM_UNSENT;
11582         chk->snd_count = 0;
11583         chk->whoTo = net;
11584         atomic_add_int(&chk->whoTo->ref_count, 1);
11585         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11586         cwr->ch.chunk_type = SCTP_ECN_CWR;
11587         cwr->ch.chunk_flags = override;
11588         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11589         cwr->tsn = htonl(high_tsn);
11590         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11591         asoc->ctrl_queue_cnt++;
11592 }
11593
11594 static int
11595 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11596     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11597 {
11598         uint16_t len, old_len, i;
11599         struct sctp_stream_reset_out_request *req_out;
11600         struct sctp_chunkhdr *ch;
11601         int at;
11602         int number_entries = 0;
11603
11604         ch = mtod(chk->data, struct sctp_chunkhdr *);
11605         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11606         /* get to new offset for the param. */
11607         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11608         /* now how long will this param be? */
11609         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11610                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11611                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11612                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11613                         number_entries++;
11614                 }
11615         }
11616         if (number_entries == 0) {
11617                 return (0);
11618         }
11619         if (number_entries == stcb->asoc.streamoutcnt) {
11620                 number_entries = 0;
11621         }
11622         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11623                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11624         }
11625         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11626         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11627         req_out->ph.param_length = htons(len);
11628         req_out->request_seq = htonl(seq);
11629         req_out->response_seq = htonl(resp_seq);
11630         req_out->send_reset_at_tsn = htonl(last_sent);
11631         at = 0;
11632         if (number_entries) {
11633                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11634                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11635                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11636                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11637                                 req_out->list_of_streams[at] = htons(i);
11638                                 at++;
11639                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11640                                 if (at >= number_entries) {
11641                                         break;
11642                                 }
11643                         }
11644                 }
11645         } else {
11646                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11647                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11648                 }
11649         }
11650         if (SCTP_SIZE32(len) > len) {
11651                 /*-
11652                  * Need to worry about the pad we may end up adding to the
11653                  * end. This is easy since the struct is either aligned to 4
11654                  * bytes or 2 bytes off.
11655                  */
11656                 req_out->list_of_streams[number_entries] = 0;
11657         }
11658         /* now fix the chunk length */
11659         ch->chunk_length = htons(len + old_len);
11660         chk->book_size = len + old_len;
11661         chk->book_size_scale = 0;
11662         chk->send_size = SCTP_SIZE32(chk->book_size);
11663         SCTP_BUF_LEN(chk->data) = chk->send_size;
11664         return (1);
11665 }
11666
11667 static void
11668 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11669     int number_entries, uint16_t * list,
11670     uint32_t seq)
11671 {
11672         uint16_t len, old_len, i;
11673         struct sctp_stream_reset_in_request *req_in;
11674         struct sctp_chunkhdr *ch;
11675
11676         ch = mtod(chk->data, struct sctp_chunkhdr *);
11677         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11678
11679         /* get to new offset for the param. */
11680         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11681         /* now how long will this param be? */
11682         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11683         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11684         req_in->ph.param_length = htons(len);
11685         req_in->request_seq = htonl(seq);
11686         if (number_entries) {
11687                 for (i = 0; i < number_entries; i++) {
11688                         req_in->list_of_streams[i] = htons(list[i]);
11689                 }
11690         }
11691         if (SCTP_SIZE32(len) > len) {
11692                 /*-
11693                  * Need to worry about the pad we may end up adding to the
11694                  * end. This is easy since the struct is either aligned to 4
11695                  * bytes or 2 bytes off.
11696                  */
11697                 req_in->list_of_streams[number_entries] = 0;
11698         }
11699         /* now fix the chunk length */
11700         ch->chunk_length = htons(len + old_len);
11701         chk->book_size = len + old_len;
11702         chk->book_size_scale = 0;
11703         chk->send_size = SCTP_SIZE32(chk->book_size);
11704         SCTP_BUF_LEN(chk->data) = chk->send_size;
11705         return;
11706 }
11707
11708 static void
11709 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11710     uint32_t seq)
11711 {
11712         uint16_t len, old_len;
11713         struct sctp_stream_reset_tsn_request *req_tsn;
11714         struct sctp_chunkhdr *ch;
11715
11716         ch = mtod(chk->data, struct sctp_chunkhdr *);
11717         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11718
11719         /* get to new offset for the param. */
11720         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11721         /* now how long will this param be? */
11722         len = sizeof(struct sctp_stream_reset_tsn_request);
11723         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11724         req_tsn->ph.param_length = htons(len);
11725         req_tsn->request_seq = htonl(seq);
11726
11727         /* now fix the chunk length */
11728         ch->chunk_length = htons(len + old_len);
11729         chk->send_size = len + old_len;
11730         chk->book_size = SCTP_SIZE32(chk->send_size);
11731         chk->book_size_scale = 0;
11732         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11733         return;
11734 }
11735
11736 void
11737 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11738     uint32_t resp_seq, uint32_t result)
11739 {
11740         uint16_t len, old_len;
11741         struct sctp_stream_reset_response *resp;
11742         struct sctp_chunkhdr *ch;
11743
11744         ch = mtod(chk->data, struct sctp_chunkhdr *);
11745         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11746
11747         /* get to new offset for the param. */
11748         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11749         /* now how long will this param be? */
11750         len = sizeof(struct sctp_stream_reset_response);
11751         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11752         resp->ph.param_length = htons(len);
11753         resp->response_seq = htonl(resp_seq);
11754         resp->result = ntohl(result);
11755
11756         /* now fix the chunk length */
11757         ch->chunk_length = htons(len + old_len);
11758         chk->book_size = len + old_len;
11759         chk->book_size_scale = 0;
11760         chk->send_size = SCTP_SIZE32(chk->book_size);
11761         SCTP_BUF_LEN(chk->data) = chk->send_size;
11762         return;
11763 }
11764
11765 void
11766 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11767     struct sctp_stream_reset_list *ent,
11768     int response)
11769 {
11770         struct sctp_association *asoc;
11771         struct sctp_tmit_chunk *chk;
11772         struct sctp_chunkhdr *ch;
11773
11774         asoc = &stcb->asoc;
11775
11776         /*
11777          * Reset our last reset action to the new one IP -> response
11778          * (PERFORMED probably). This assures that if we fail to send, a
11779          * retran from the peer will get the new response.
11780          */
11781         asoc->last_reset_action[0] = response;
11782         if (asoc->stream_reset_outstanding) {
11783                 return;
11784         }
11785         sctp_alloc_a_chunk(stcb, chk);
11786         if (chk == NULL) {
11787                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11788                 return;
11789         }
11790         chk->copy_by_ref = 0;
11791         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11792         chk->rec.chunk_id.can_take_data = 0;
11793         chk->flags = 0;
11794         chk->asoc = &stcb->asoc;
11795         chk->book_size = sizeof(struct sctp_chunkhdr);
11796         chk->send_size = SCTP_SIZE32(chk->book_size);
11797         chk->book_size_scale = 0;
11798         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11799         if (chk->data == NULL) {
11800                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11801                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11802                 return;
11803         }
11804         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11805         sctp_add_stream_reset_result(chk, ent->seq, response);
11806         /* setup chunk parameters */
11807         chk->sent = SCTP_DATAGRAM_UNSENT;
11808         chk->snd_count = 0;
11809         if (stcb->asoc.alternate) {
11810                 chk->whoTo = stcb->asoc.alternate;
11811         } else {
11812                 chk->whoTo = stcb->asoc.primary_destination;
11813         }
11814         ch = mtod(chk->data, struct sctp_chunkhdr *);
11815         ch->chunk_type = SCTP_STREAM_RESET;
11816         ch->chunk_flags = 0;
11817         ch->chunk_length = htons(chk->book_size);
11818         atomic_add_int(&chk->whoTo->ref_count, 1);
11819         SCTP_BUF_LEN(chk->data) = chk->send_size;
11820         /* insert the chunk for sending */
11821         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11822             chk,
11823             sctp_next);
11824         asoc->ctrl_queue_cnt++;
11825 }
11826
11827 void
11828 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11829     uint32_t resp_seq, uint32_t result,
11830     uint32_t send_una, uint32_t recv_next)
11831 {
11832         uint16_t len, old_len;
11833         struct sctp_stream_reset_response_tsn *resp;
11834         struct sctp_chunkhdr *ch;
11835
11836         ch = mtod(chk->data, struct sctp_chunkhdr *);
11837         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11838
11839         /* get to new offset for the param. */
11840         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11841         /* now how long will this param be? */
11842         len = sizeof(struct sctp_stream_reset_response_tsn);
11843         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11844         resp->ph.param_length = htons(len);
11845         resp->response_seq = htonl(resp_seq);
11846         resp->result = htonl(result);
11847         resp->senders_next_tsn = htonl(send_una);
11848         resp->receivers_next_tsn = htonl(recv_next);
11849
11850         /* now fix the chunk length */
11851         ch->chunk_length = htons(len + old_len);
11852         chk->book_size = len + old_len;
11853         chk->send_size = SCTP_SIZE32(chk->book_size);
11854         chk->book_size_scale = 0;
11855         SCTP_BUF_LEN(chk->data) = chk->send_size;
11856         return;
11857 }
11858
11859 static void
11860 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11861     uint32_t seq,
11862     uint16_t adding)
11863 {
11864         uint16_t len, old_len;
11865         struct sctp_chunkhdr *ch;
11866         struct sctp_stream_reset_add_strm *addstr;
11867
11868         ch = mtod(chk->data, struct sctp_chunkhdr *);
11869         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11870
11871         /* get to new offset for the param. */
11872         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11873         /* now how long will this param be? */
11874         len = sizeof(struct sctp_stream_reset_add_strm);
11875
11876         /* Fill it out. */
11877         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11878         addstr->ph.param_length = htons(len);
11879         addstr->request_seq = htonl(seq);
11880         addstr->number_of_streams = htons(adding);
11881         addstr->reserved = 0;
11882
11883         /* now fix the chunk length */
11884         ch->chunk_length = htons(len + old_len);
11885         chk->send_size = len + old_len;
11886         chk->book_size = SCTP_SIZE32(chk->send_size);
11887         chk->book_size_scale = 0;
11888         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11889         return;
11890 }
11891
11892 static void
11893 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11894     uint32_t seq,
11895     uint16_t adding)
11896 {
11897         uint16_t len, old_len;
11898         struct sctp_chunkhdr *ch;
11899         struct sctp_stream_reset_add_strm *addstr;
11900
11901         ch = mtod(chk->data, struct sctp_chunkhdr *);
11902         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11903
11904         /* get to new offset for the param. */
11905         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11906         /* now how long will this param be? */
11907         len = sizeof(struct sctp_stream_reset_add_strm);
11908         /* Fill it out. */
11909         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11910         addstr->ph.param_length = htons(len);
11911         addstr->request_seq = htonl(seq);
11912         addstr->number_of_streams = htons(adding);
11913         addstr->reserved = 0;
11914
11915         /* now fix the chunk length */
11916         ch->chunk_length = htons(len + old_len);
11917         chk->send_size = len + old_len;
11918         chk->book_size = SCTP_SIZE32(chk->send_size);
11919         chk->book_size_scale = 0;
11920         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11921         return;
11922 }
11923
11924 int
11925 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11926 {
11927         struct sctp_association *asoc;
11928         struct sctp_tmit_chunk *chk;
11929         struct sctp_chunkhdr *ch;
11930         uint32_t seq;
11931
11932         asoc = &stcb->asoc;
11933         asoc->trigger_reset = 0;
11934         if (asoc->stream_reset_outstanding) {
11935                 return (EALREADY);
11936         }
11937         sctp_alloc_a_chunk(stcb, chk);
11938         if (chk == NULL) {
11939                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11940                 return (ENOMEM);
11941         }
11942         chk->copy_by_ref = 0;
11943         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11944         chk->rec.chunk_id.can_take_data = 0;
11945         chk->flags = 0;
11946         chk->asoc = &stcb->asoc;
11947         chk->book_size = sizeof(struct sctp_chunkhdr);
11948         chk->send_size = SCTP_SIZE32(chk->book_size);
11949         chk->book_size_scale = 0;
11950         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11951         if (chk->data == NULL) {
11952                 sctp_free_a_chunk(stcb, chk, so_locked);
11953                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11954                 return (ENOMEM);
11955         }
11956         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11957
11958         /* setup chunk parameters */
11959         chk->sent = SCTP_DATAGRAM_UNSENT;
11960         chk->snd_count = 0;
11961         if (stcb->asoc.alternate) {
11962                 chk->whoTo = stcb->asoc.alternate;
11963         } else {
11964                 chk->whoTo = stcb->asoc.primary_destination;
11965         }
11966         ch = mtod(chk->data, struct sctp_chunkhdr *);
11967         ch->chunk_type = SCTP_STREAM_RESET;
11968         ch->chunk_flags = 0;
11969         ch->chunk_length = htons(chk->book_size);
11970         atomic_add_int(&chk->whoTo->ref_count, 1);
11971         SCTP_BUF_LEN(chk->data) = chk->send_size;
11972         seq = stcb->asoc.str_reset_seq_out;
11973         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11974                 seq++;
11975                 asoc->stream_reset_outstanding++;
11976         } else {
11977                 m_freem(chk->data);
11978                 chk->data = NULL;
11979                 sctp_free_a_chunk(stcb, chk, so_locked);
11980                 return (ENOENT);
11981         }
11982         asoc->str_reset = chk;
11983         /* insert the chunk for sending */
11984         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11985             chk,
11986             sctp_next);
11987         asoc->ctrl_queue_cnt++;
11988
11989         if (stcb->asoc.send_sack) {
11990                 sctp_send_sack(stcb, so_locked);
11991         }
11992         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11993         return (0);
11994 }
11995
11996 int
11997 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11998     uint16_t number_entries, uint16_t * list,
11999     uint8_t send_in_req,
12000     uint8_t send_tsn_req,
12001     uint8_t add_stream,
12002     uint16_t adding_o,
12003     uint16_t adding_i, uint8_t peer_asked)
12004 {
12005         struct sctp_association *asoc;
12006         struct sctp_tmit_chunk *chk;
12007         struct sctp_chunkhdr *ch;
12008         int can_send_out_req = 0;
12009         uint32_t seq;
12010
12011         asoc = &stcb->asoc;
12012         if (asoc->stream_reset_outstanding) {
12013                 /*-
12014                  * Already one pending, must get ACK back to clear the flag.
12015                  */
12016                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12017                 return (EBUSY);
12018         }
12019         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12020             (add_stream == 0)) {
12021                 /* nothing to do */
12022                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12023                 return (EINVAL);
12024         }
12025         if (send_tsn_req && send_in_req) {
12026                 /* error, can't do that */
12027                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12028                 return (EINVAL);
12029         } else if (send_in_req) {
12030                 can_send_out_req = 1;
12031         }
12032         if (number_entries > (MCLBYTES -
12033             SCTP_MIN_OVERHEAD -
12034             sizeof(struct sctp_chunkhdr) -
12035             sizeof(struct sctp_stream_reset_out_request)) /
12036             sizeof(uint16_t)) {
12037                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12038                 return (ENOMEM);
12039         }
12040         sctp_alloc_a_chunk(stcb, chk);
12041         if (chk == NULL) {
12042                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12043                 return (ENOMEM);
12044         }
12045         chk->copy_by_ref = 0;
12046         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12047         chk->rec.chunk_id.can_take_data = 0;
12048         chk->flags = 0;
12049         chk->asoc = &stcb->asoc;
12050         chk->book_size = sizeof(struct sctp_chunkhdr);
12051         chk->send_size = SCTP_SIZE32(chk->book_size);
12052         chk->book_size_scale = 0;
12053
12054         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12055         if (chk->data == NULL) {
12056                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12057                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12058                 return (ENOMEM);
12059         }
12060         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12061
12062         /* setup chunk parameters */
12063         chk->sent = SCTP_DATAGRAM_UNSENT;
12064         chk->snd_count = 0;
12065         if (stcb->asoc.alternate) {
12066                 chk->whoTo = stcb->asoc.alternate;
12067         } else {
12068                 chk->whoTo = stcb->asoc.primary_destination;
12069         }
12070         atomic_add_int(&chk->whoTo->ref_count, 1);
12071         ch = mtod(chk->data, struct sctp_chunkhdr *);
12072         ch->chunk_type = SCTP_STREAM_RESET;
12073         ch->chunk_flags = 0;
12074         ch->chunk_length = htons(chk->book_size);
12075         SCTP_BUF_LEN(chk->data) = chk->send_size;
12076
12077         seq = stcb->asoc.str_reset_seq_out;
12078         if (can_send_out_req) {
12079                 int ret;
12080
12081                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12082                 if (ret) {
12083                         seq++;
12084                         asoc->stream_reset_outstanding++;
12085                 }
12086         }
12087         if ((add_stream & 1) &&
12088             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12089                 /* Need to allocate more */
12090                 struct sctp_stream_out *oldstream;
12091                 struct sctp_stream_queue_pending *sp, *nsp;
12092                 int i;
12093
12094 #if defined(SCTP_DETAILED_STR_STATS)
12095                 int j;
12096
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_sequence_send = oldstream[i].next_sequence_send;
12123                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12124                         stcb->asoc.strmout[i].stream_no = i;
12125                         stcb->asoc.strmout[i].state = oldstream[i].state;
12126                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
12127                         /* now anything on those queues? */
12128                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12129                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12130                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12131                         }
12132                         /* Now move assoc pointers too */
12133                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
12134                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
12135                         }
12136                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
12137                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
12138                         }
12139                 }
12140                 /* now the new streams */
12141                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12142                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12143                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12144                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12145 #if defined(SCTP_DETAILED_STR_STATS)
12146                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12147                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12148                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12149                         }
12150 #else
12151                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12152                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12153 #endif
12154                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
12155                         stcb->asoc.strmout[i].stream_no = i;
12156                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12157                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12158                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12159                 }
12160                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12161                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12162                 SCTP_TCB_SEND_UNLOCK(stcb);
12163         }
12164 skip_stuff:
12165         if ((add_stream & 1) && (adding_o > 0)) {
12166                 asoc->strm_pending_add_size = adding_o;
12167                 asoc->peer_req_out = peer_asked;
12168                 sctp_add_an_out_stream(chk, seq, adding_o);
12169                 seq++;
12170                 asoc->stream_reset_outstanding++;
12171         }
12172         if ((add_stream & 2) && (adding_i > 0)) {
12173                 sctp_add_an_in_stream(chk, seq, adding_i);
12174                 seq++;
12175                 asoc->stream_reset_outstanding++;
12176         }
12177         if (send_in_req) {
12178                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12179                 seq++;
12180                 asoc->stream_reset_outstanding++;
12181         }
12182         if (send_tsn_req) {
12183                 sctp_add_stream_reset_tsn(chk, seq);
12184                 asoc->stream_reset_outstanding++;
12185         }
12186         asoc->str_reset = chk;
12187         /* insert the chunk for sending */
12188         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12189             chk,
12190             sctp_next);
12191         asoc->ctrl_queue_cnt++;
12192         if (stcb->asoc.send_sack) {
12193                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12194         }
12195         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12196         return (0);
12197 }
12198
12199 void
12200 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12201     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12202     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12203     uint32_t vrf_id, uint16_t port)
12204 {
12205         /* Don't respond to an ABORT with an ABORT. */
12206         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12207                 if (cause)
12208                         sctp_m_freem(cause);
12209                 return;
12210         }
12211         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12212             mflowtype, mflowid, fibnum,
12213             vrf_id, port);
12214         return;
12215 }
12216
12217 void
12218 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12219     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12220     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12221     uint32_t vrf_id, uint16_t port)
12222 {
12223         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12224             mflowtype, mflowid, fibnum,
12225             vrf_id, port);
12226         return;
12227 }
12228
12229 static struct mbuf *
12230 sctp_copy_resume(struct uio *uio,
12231     int max_send_len,
12232     int user_marks_eor,
12233     int *error,
12234     uint32_t * sndout,
12235     struct mbuf **new_tail)
12236 {
12237         struct mbuf *m;
12238
12239         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12240             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12241         if (m == NULL) {
12242                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12243                 *error = ENOBUFS;
12244         } else {
12245                 *sndout = m_length(m, NULL);
12246                 *new_tail = m_last(m);
12247         }
12248         return (m);
12249 }
12250
12251 static int
12252 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12253     struct uio *uio,
12254     int resv_upfront)
12255 {
12256         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12257             resv_upfront, 0);
12258         if (sp->data == NULL) {
12259                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12260                 return (ENOBUFS);
12261         }
12262         sp->tail_mbuf = m_last(sp->data);
12263         return (0);
12264 }
12265
12266
12267
12268 static struct sctp_stream_queue_pending *
12269 sctp_copy_it_in(struct sctp_tcb *stcb,
12270     struct sctp_association *asoc,
12271     struct sctp_sndrcvinfo *srcv,
12272     struct uio *uio,
12273     struct sctp_nets *net,
12274     int max_send_len,
12275     int user_marks_eor,
12276     int *error)
12277 {
12278         /*-
12279          * This routine must be very careful in its work. Protocol
12280          * processing is up and running so care must be taken to spl...()
12281          * when you need to do something that may effect the stcb/asoc. The
12282          * sb is locked however. When data is copied the protocol processing
12283          * should be enabled since this is a slower operation...
12284          */
12285         struct sctp_stream_queue_pending *sp = NULL;
12286         int resv_in_first;
12287
12288         *error = 0;
12289         /* Now can we send this? */
12290         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12291             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12292             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12293             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12294                 /* got data while shutting down */
12295                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12296                 *error = ECONNRESET;
12297                 goto out_now;
12298         }
12299         sctp_alloc_a_strmoq(stcb, sp);
12300         if (sp == NULL) {
12301                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12302                 *error = ENOMEM;
12303                 goto out_now;
12304         }
12305         sp->act_flags = 0;
12306         sp->sender_all_done = 0;
12307         sp->sinfo_flags = srcv->sinfo_flags;
12308         sp->timetolive = srcv->sinfo_timetolive;
12309         sp->ppid = srcv->sinfo_ppid;
12310         sp->context = srcv->sinfo_context;
12311         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12312
12313         sp->stream = srcv->sinfo_stream;
12314         sp->length = 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
12374 #if defined(INET) && defined(INET6)
12375         struct sockaddr_in sin;
12376
12377 #endif
12378
12379         if (control) {
12380                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12381                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12382                     sizeof(sndrcvninfo))) {
12383                         /* got one */
12384                         use_sndinfo = 1;
12385                 }
12386         }
12387         addr_to_use = addr;
12388 #if defined(INET) && defined(INET6)
12389         if ((addr) && (addr->sa_family == AF_INET6)) {
12390                 struct sockaddr_in6 *sin6;
12391
12392                 sin6 = (struct sockaddr_in6 *)addr;
12393                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12394                         in6_sin6_2_sin(&sin, sin6);
12395                         addr_to_use = (struct sockaddr *)&sin;
12396                 }
12397         }
12398 #endif
12399         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12400             control,
12401             flags,
12402             use_sndinfo ? &sndrcvninfo : NULL
12403             ,p
12404             );
12405         return (error);
12406 }
12407
12408
12409 int
12410 sctp_lower_sosend(struct socket *so,
12411     struct sockaddr *addr,
12412     struct uio *uio,
12413     struct mbuf *i_pak,
12414     struct mbuf *control,
12415     int flags,
12416     struct sctp_sndrcvinfo *srcv
12417     ,
12418     struct thread *p
12419 )
12420 {
12421         unsigned int sndlen = 0, max_len;
12422         int error, len;
12423         struct mbuf *top = NULL;
12424         int queue_only = 0, queue_only_for_init = 0;
12425         int free_cnt_applied = 0;
12426         int un_sent;
12427         int now_filled = 0;
12428         unsigned int inqueue_bytes = 0;
12429         struct sctp_block_entry be;
12430         struct sctp_inpcb *inp;
12431         struct sctp_tcb *stcb = NULL;
12432         struct timeval now;
12433         struct sctp_nets *net;
12434         struct sctp_association *asoc;
12435         struct sctp_inpcb *t_inp;
12436         int user_marks_eor;
12437         int create_lock_applied = 0;
12438         int nagle_applies = 0;
12439         int some_on_control = 0;
12440         int got_all_of_the_send = 0;
12441         int hold_tcblock = 0;
12442         int non_blocking = 0;
12443         uint32_t local_add_more, local_soresv = 0;
12444         uint16_t port;
12445         uint16_t sinfo_flags;
12446         sctp_assoc_t sinfo_assoc_id;
12447
12448         error = 0;
12449         net = NULL;
12450         stcb = NULL;
12451         asoc = NULL;
12452
12453         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12454         if (inp == NULL) {
12455                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12456                 error = EINVAL;
12457                 if (i_pak) {
12458                         SCTP_RELEASE_PKT(i_pak);
12459                 }
12460                 return (error);
12461         }
12462         if ((uio == NULL) && (i_pak == NULL)) {
12463                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12464                 return (EINVAL);
12465         }
12466         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12467         atomic_add_int(&inp->total_sends, 1);
12468         if (uio) {
12469                 if (uio->uio_resid < 0) {
12470                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12471                         return (EINVAL);
12472                 }
12473                 sndlen = uio->uio_resid;
12474         } else {
12475                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12476                 sndlen = SCTP_HEADER_LEN(i_pak);
12477         }
12478         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12479             (void *)addr,
12480             sndlen);
12481         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12482             (inp->sctp_socket->so_qlimit)) {
12483                 /* The listener can NOT send */
12484                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12485                 error = ENOTCONN;
12486                 goto out_unlocked;
12487         }
12488         /**
12489          * Pre-screen address, if one is given the sin-len
12490          * must be set correctly!
12491          */
12492         if (addr) {
12493                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12494
12495                 switch (raddr->sa.sa_family) {
12496 #ifdef INET
12497                 case AF_INET:
12498                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12499                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12500                                 error = EINVAL;
12501                                 goto out_unlocked;
12502                         }
12503                         port = raddr->sin.sin_port;
12504                         break;
12505 #endif
12506 #ifdef INET6
12507                 case AF_INET6:
12508                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12509                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12510                                 error = EINVAL;
12511                                 goto out_unlocked;
12512                         }
12513                         port = raddr->sin6.sin6_port;
12514                         break;
12515 #endif
12516                 default:
12517                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12518                         error = EAFNOSUPPORT;
12519                         goto out_unlocked;
12520                 }
12521         } else
12522                 port = 0;
12523
12524         if (srcv) {
12525                 sinfo_flags = srcv->sinfo_flags;
12526                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12527                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12528                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12529                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12530                         error = EINVAL;
12531                         goto out_unlocked;
12532                 }
12533                 if (srcv->sinfo_flags)
12534                         SCTP_STAT_INCR(sctps_sends_with_flags);
12535         } else {
12536                 sinfo_flags = inp->def_send.sinfo_flags;
12537                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12538         }
12539         if (sinfo_flags & SCTP_SENDALL) {
12540                 /* its a sendall */
12541                 error = sctp_sendall(inp, uio, top, srcv);
12542                 top = NULL;
12543                 goto out_unlocked;
12544         }
12545         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12546                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12547                 error = EINVAL;
12548                 goto out_unlocked;
12549         }
12550         /* now we must find the assoc */
12551         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12552             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12553                 SCTP_INP_RLOCK(inp);
12554                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12555                 if (stcb) {
12556                         SCTP_TCB_LOCK(stcb);
12557                         hold_tcblock = 1;
12558                 }
12559                 SCTP_INP_RUNLOCK(inp);
12560         } else if (sinfo_assoc_id) {
12561                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12562         } else if (addr) {
12563                 /*-
12564                  * Since we did not use findep we must
12565                  * increment it, and if we don't find a tcb
12566                  * decrement it.
12567                  */
12568                 SCTP_INP_WLOCK(inp);
12569                 SCTP_INP_INCR_REF(inp);
12570                 SCTP_INP_WUNLOCK(inp);
12571                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12572                 if (stcb == NULL) {
12573                         SCTP_INP_WLOCK(inp);
12574                         SCTP_INP_DECR_REF(inp);
12575                         SCTP_INP_WUNLOCK(inp);
12576                 } else {
12577                         hold_tcblock = 1;
12578                 }
12579         }
12580         if ((stcb == NULL) && (addr)) {
12581                 /* Possible implicit send? */
12582                 SCTP_ASOC_CREATE_LOCK(inp);
12583                 create_lock_applied = 1;
12584                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12585                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12586                         /* Should I really unlock ? */
12587                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12588                         error = EINVAL;
12589                         goto out_unlocked;
12590
12591                 }
12592                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12593                     (addr->sa_family == AF_INET6)) {
12594                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12595                         error = EINVAL;
12596                         goto out_unlocked;
12597                 }
12598                 SCTP_INP_WLOCK(inp);
12599                 SCTP_INP_INCR_REF(inp);
12600                 SCTP_INP_WUNLOCK(inp);
12601                 /* With the lock applied look again */
12602                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12603                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12604                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12605                 }
12606                 if (stcb == NULL) {
12607                         SCTP_INP_WLOCK(inp);
12608                         SCTP_INP_DECR_REF(inp);
12609                         SCTP_INP_WUNLOCK(inp);
12610                 } else {
12611                         hold_tcblock = 1;
12612                 }
12613                 if (error) {
12614                         goto out_unlocked;
12615                 }
12616                 if (t_inp != inp) {
12617                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12618                         error = ENOTCONN;
12619                         goto out_unlocked;
12620                 }
12621         }
12622         if (stcb == NULL) {
12623                 if (addr == NULL) {
12624                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12625                         error = ENOENT;
12626                         goto out_unlocked;
12627                 } else {
12628                         /* We must go ahead and start the INIT process */
12629                         uint32_t vrf_id;
12630
12631                         if ((sinfo_flags & SCTP_ABORT) ||
12632                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12633                                 /*-
12634                                  * User asks to abort a non-existant assoc,
12635                                  * or EOF a non-existant assoc with no data
12636                                  */
12637                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12638                                 error = ENOENT;
12639                                 goto out_unlocked;
12640                         }
12641                         /* get an asoc/stcb struct */
12642                         vrf_id = inp->def_vrf_id;
12643 #ifdef INVARIANTS
12644                         if (create_lock_applied == 0) {
12645                                 panic("Error, should hold create lock and I don't?");
12646                         }
12647 #endif
12648                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12649                             inp->sctp_ep.pre_open_stream_count,
12650                             p
12651                             );
12652                         if (stcb == NULL) {
12653                                 /* Error is setup for us in the call */
12654                                 goto out_unlocked;
12655                         }
12656                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12657                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12658                                 /*
12659                                  * Set the connected flag so we can queue
12660                                  * data
12661                                  */
12662                                 soisconnecting(so);
12663                         }
12664                         hold_tcblock = 1;
12665                         if (create_lock_applied) {
12666                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12667                                 create_lock_applied = 0;
12668                         } else {
12669                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12670                         }
12671                         /*
12672                          * Turn on queue only flag to prevent data from
12673                          * being sent
12674                          */
12675                         queue_only = 1;
12676                         asoc = &stcb->asoc;
12677                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12678                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12679
12680                         /* initialize authentication params for the assoc */
12681                         sctp_initialize_auth_params(inp, stcb);
12682
12683                         if (control) {
12684                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12685                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12686                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12687                                         hold_tcblock = 0;
12688                                         stcb = NULL;
12689                                         goto out_unlocked;
12690                                 }
12691                         }
12692                         /* out with the INIT */
12693                         queue_only_for_init = 1;
12694                         /*-
12695                          * we may want to dig in after this call and adjust the MTU
12696                          * value. It defaulted to 1500 (constant) but the ro
12697                          * structure may now have an update and thus we may need to
12698                          * change it BEFORE we append the message.
12699                          */
12700                 }
12701         } else
12702                 asoc = &stcb->asoc;
12703         if (srcv == NULL)
12704                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12705         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12706                 if (addr)
12707                         net = sctp_findnet(stcb, addr);
12708                 else
12709                         net = NULL;
12710                 if ((net == NULL) ||
12711                     ((port != 0) && (port != stcb->rport))) {
12712                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12713                         error = EINVAL;
12714                         goto out_unlocked;
12715                 }
12716         } else {
12717                 if (stcb->asoc.alternate) {
12718                         net = stcb->asoc.alternate;
12719                 } else {
12720                         net = stcb->asoc.primary_destination;
12721                 }
12722         }
12723         atomic_add_int(&stcb->total_sends, 1);
12724         /* Keep the stcb from being freed under our feet */
12725         atomic_add_int(&asoc->refcnt, 1);
12726         free_cnt_applied = 1;
12727
12728         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12729                 if (sndlen > asoc->smallest_mtu) {
12730                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12731                         error = EMSGSIZE;
12732                         goto out_unlocked;
12733                 }
12734         }
12735         if (SCTP_SO_IS_NBIO(so)
12736             || (flags & MSG_NBIO)
12737             ) {
12738                 non_blocking = 1;
12739         }
12740         /* would we block? */
12741         if (non_blocking) {
12742                 if (hold_tcblock == 0) {
12743                         SCTP_TCB_LOCK(stcb);
12744                         hold_tcblock = 1;
12745                 }
12746                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12747                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12748                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12749                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12750                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12751                                 error = EMSGSIZE;
12752                         else
12753                                 error = EWOULDBLOCK;
12754                         goto out_unlocked;
12755                 }
12756                 stcb->asoc.sb_send_resv += sndlen;
12757                 SCTP_TCB_UNLOCK(stcb);
12758                 hold_tcblock = 0;
12759         } else {
12760                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12761         }
12762         local_soresv = sndlen;
12763         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12764                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12765                 error = ECONNRESET;
12766                 goto out_unlocked;
12767         }
12768         if (create_lock_applied) {
12769                 SCTP_ASOC_CREATE_UNLOCK(inp);
12770                 create_lock_applied = 0;
12771         }
12772         /* Is the stream no. valid? */
12773         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12774                 /* Invalid stream number */
12775                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12776                 error = EINVAL;
12777                 goto out_unlocked;
12778         }
12779         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12780             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12781                 /*
12782                  * Can't queue any data while stream reset is underway.
12783                  */
12784                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12785                         error = EAGAIN;
12786                 } else {
12787                         error = EINVAL;
12788                 }
12789                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12790                 goto out_unlocked;
12791         }
12792         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12793             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12794                 queue_only = 1;
12795         }
12796         /* we are now done with all control */
12797         if (control) {
12798                 sctp_m_freem(control);
12799                 control = NULL;
12800         }
12801         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12802             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12803             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12804             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12805                 if (srcv->sinfo_flags & SCTP_ABORT) {
12806                         ;
12807                 } else {
12808                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12809                         error = ECONNRESET;
12810                         goto out_unlocked;
12811                 }
12812         }
12813         /* Ok, we will attempt a msgsnd :> */
12814         if (p) {
12815                 p->td_ru.ru_msgsnd++;
12816         }
12817         /* Are we aborting? */
12818         if (srcv->sinfo_flags & SCTP_ABORT) {
12819                 struct mbuf *mm;
12820                 int tot_demand, tot_out = 0, max_out;
12821
12822                 SCTP_STAT_INCR(sctps_sends_with_abort);
12823                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12824                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12825                         /* It has to be up before we abort */
12826                         /* how big is the user initiated abort? */
12827                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12828                         error = EINVAL;
12829                         goto out;
12830                 }
12831                 if (hold_tcblock) {
12832                         SCTP_TCB_UNLOCK(stcb);
12833                         hold_tcblock = 0;
12834                 }
12835                 if (top) {
12836                         struct mbuf *cntm = NULL;
12837
12838                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12839                         if (sndlen != 0) {
12840                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12841                                         tot_out += SCTP_BUF_LEN(cntm);
12842                                 }
12843                         }
12844                 } else {
12845                         /* Must fit in a MTU */
12846                         tot_out = sndlen;
12847                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12848                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12849                                 /* To big */
12850                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12851                                 error = EMSGSIZE;
12852                                 goto out;
12853                         }
12854                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12855                 }
12856                 if (mm == NULL) {
12857                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12858                         error = ENOMEM;
12859                         goto out;
12860                 }
12861                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12862                 max_out -= sizeof(struct sctp_abort_msg);
12863                 if (tot_out > max_out) {
12864                         tot_out = max_out;
12865                 }
12866                 if (mm) {
12867                         struct sctp_paramhdr *ph;
12868
12869                         /* now move forward the data pointer */
12870                         ph = mtod(mm, struct sctp_paramhdr *);
12871                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12872                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12873                         ph++;
12874                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12875                         if (top == NULL) {
12876                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12877                                 if (error) {
12878                                         /*-
12879                                          * Here if we can't get his data we
12880                                          * still abort we just don't get to
12881                                          * send the users note :-0
12882                                          */
12883                                         sctp_m_freem(mm);
12884                                         mm = NULL;
12885                                 }
12886                         } else {
12887                                 if (sndlen != 0) {
12888                                         SCTP_BUF_NEXT(mm) = top;
12889                                 }
12890                         }
12891                 }
12892                 if (hold_tcblock == 0) {
12893                         SCTP_TCB_LOCK(stcb);
12894                 }
12895                 atomic_add_int(&stcb->asoc.refcnt, -1);
12896                 free_cnt_applied = 0;
12897                 /* release this lock, otherwise we hang on ourselves */
12898                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12899                 /* now relock the stcb so everything is sane */
12900                 hold_tcblock = 0;
12901                 stcb = NULL;
12902                 /*
12903                  * In this case top is already chained to mm avoid double
12904                  * free, since we free it below if top != NULL and driver
12905                  * would free it after sending the packet out
12906                  */
12907                 if (sndlen != 0) {
12908                         top = NULL;
12909                 }
12910                 goto out_unlocked;
12911         }
12912         /* Calculate the maximum we can send */
12913         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12914         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12915                 if (non_blocking) {
12916                         /* we already checked for non-blocking above. */
12917                         max_len = sndlen;
12918                 } else {
12919                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12920                 }
12921         } else {
12922                 max_len = 0;
12923         }
12924         if (hold_tcblock) {
12925                 SCTP_TCB_UNLOCK(stcb);
12926                 hold_tcblock = 0;
12927         }
12928         if (asoc->strmout == NULL) {
12929                 /* huh? software error */
12930                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12931                 error = EFAULT;
12932                 goto out_unlocked;
12933         }
12934         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12935         if ((user_marks_eor == 0) &&
12936             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12937                 /* It will NEVER fit */
12938                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12939                 error = EMSGSIZE;
12940                 goto out_unlocked;
12941         }
12942         if ((uio == NULL) && user_marks_eor) {
12943                 /*-
12944                  * We do not support eeor mode for
12945                  * sending with mbuf chains (like sendfile).
12946                  */
12947                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12948                 error = EINVAL;
12949                 goto out_unlocked;
12950         }
12951         if (user_marks_eor) {
12952                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12953         } else {
12954                 /*-
12955                  * For non-eeor the whole message must fit in
12956                  * the socket send buffer.
12957                  */
12958                 local_add_more = sndlen;
12959         }
12960         len = 0;
12961         if (non_blocking) {
12962                 goto skip_preblock;
12963         }
12964         if (((max_len <= local_add_more) &&
12965             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12966             (max_len == 0) ||
12967             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12968                 /* No room right now ! */
12969                 SOCKBUF_LOCK(&so->so_snd);
12970                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12971                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12972                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12973                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12974                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12975                             inqueue_bytes,
12976                             local_add_more,
12977                             stcb->asoc.stream_queue_cnt,
12978                             stcb->asoc.chunks_on_out_queue,
12979                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12980                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12981                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12982                         }
12983                         be.error = 0;
12984                         stcb->block_entry = &be;
12985                         error = sbwait(&so->so_snd);
12986                         stcb->block_entry = NULL;
12987                         if (error || so->so_error || be.error) {
12988                                 if (error == 0) {
12989                                         if (so->so_error)
12990                                                 error = so->so_error;
12991                                         if (be.error) {
12992                                                 error = be.error;
12993                                         }
12994                                 }
12995                                 SOCKBUF_UNLOCK(&so->so_snd);
12996                                 goto out_unlocked;
12997                         }
12998                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12999                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13000                                     asoc, stcb->asoc.total_output_queue_size);
13001                         }
13002                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13003                                 goto out_unlocked;
13004                         }
13005                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13006                 }
13007                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13008                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13009                 } else {
13010                         max_len = 0;
13011                 }
13012                 SOCKBUF_UNLOCK(&so->so_snd);
13013         }
13014 skip_preblock:
13015         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13016                 goto out_unlocked;
13017         }
13018         /*
13019          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13020          * case NOTE: uio will be null when top/mbuf is passed
13021          */
13022         if (sndlen == 0) {
13023                 if (srcv->sinfo_flags & SCTP_EOF) {
13024                         got_all_of_the_send = 1;
13025                         goto dataless_eof;
13026                 } else {
13027                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13028                         error = EINVAL;
13029                         goto out;
13030                 }
13031         }
13032         if (top == NULL) {
13033                 struct sctp_stream_queue_pending *sp;
13034                 struct sctp_stream_out *strm;
13035                 uint32_t sndout;
13036
13037                 SCTP_TCB_SEND_LOCK(stcb);
13038                 if ((asoc->stream_locked) &&
13039                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13040                         SCTP_TCB_SEND_UNLOCK(stcb);
13041                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13042                         error = EINVAL;
13043                         goto out;
13044                 }
13045                 SCTP_TCB_SEND_UNLOCK(stcb);
13046
13047                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13048                 if (strm->last_msg_incomplete == 0) {
13049         do_a_copy_in:
13050                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13051                         if ((sp == NULL) || (error)) {
13052                                 goto out;
13053                         }
13054                         SCTP_TCB_SEND_LOCK(stcb);
13055                         if (sp->msg_is_complete) {
13056                                 strm->last_msg_incomplete = 0;
13057                                 asoc->stream_locked = 0;
13058                         } else {
13059                                 /*
13060                                  * Just got locked to this guy in case of an
13061                                  * interrupt.
13062                                  */
13063                                 strm->last_msg_incomplete = 1;
13064                                 asoc->stream_locked = 1;
13065                                 asoc->stream_locked_on = srcv->sinfo_stream;
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
13145                                 /* Did we reach EOR? */
13146                                 if ((uio->uio_resid == 0) &&
13147                                     ((user_marks_eor == 0) ||
13148                                     (srcv->sinfo_flags & SCTP_EOF) ||
13149                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13150                                         sp->msg_is_complete = 1;
13151                                 } else {
13152                                         sp->msg_is_complete = 0;
13153                                 }
13154                                 SCTP_TCB_SEND_UNLOCK(stcb);
13155                         }
13156                         if (uio->uio_resid == 0) {
13157                                 /* got it all? */
13158                                 continue;
13159                         }
13160                         /* PR-SCTP? */
13161                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13162                                 /*
13163                                  * This is ugly but we must assure locking
13164                                  * order
13165                                  */
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, 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 (sp) {
13322                         if (sp->msg_is_complete == 0) {
13323                                 strm->last_msg_incomplete = 1;
13324                                 asoc->stream_locked = 1;
13325                                 asoc->stream_locked_on = srcv->sinfo_stream;
13326                         } else {
13327                                 sp->sender_all_done = 1;
13328                                 strm->last_msg_incomplete = 0;
13329                                 asoc->stream_locked = 0;
13330                         }
13331                 } else {
13332                         SCTP_PRINTF("Huh no sp TSNH?\n");
13333                         strm->last_msg_incomplete = 0;
13334                         asoc->stream_locked = 0;
13335                 }
13336                 SCTP_TCB_SEND_UNLOCK(stcb);
13337                 if (uio->uio_resid == 0) {
13338                         got_all_of_the_send = 1;
13339                 }
13340         } else {
13341                 /* We send in a 0, since we do NOT have any locks */
13342                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13343                 top = NULL;
13344                 if (srcv->sinfo_flags & SCTP_EOF) {
13345                         /*
13346                          * This should only happen for Panda for the mbuf
13347                          * send case, which does NOT yet support EEOR mode.
13348                          * Thus, we can just set this flag to do the proper
13349                          * EOF handling.
13350                          */
13351                         got_all_of_the_send = 1;
13352                 }
13353         }
13354         if (error) {
13355                 goto out;
13356         }
13357 dataless_eof:
13358         /* EOF thing ? */
13359         if ((srcv->sinfo_flags & SCTP_EOF) &&
13360             (got_all_of_the_send == 1)) {
13361                 int cnt;
13362
13363                 SCTP_STAT_INCR(sctps_sends_with_eof);
13364                 error = 0;
13365                 if (hold_tcblock == 0) {
13366                         SCTP_TCB_LOCK(stcb);
13367                         hold_tcblock = 1;
13368                 }
13369                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13370                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13371                     TAILQ_EMPTY(&asoc->sent_queue) &&
13372                     (cnt == 0)) {
13373                         if (asoc->locked_on_sending) {
13374                                 goto abort_anyway;
13375                         }
13376                         /* there is nothing queued to send, so I'm done... */
13377                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13378                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13379                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13380                                 struct sctp_nets *netp;
13381
13382                                 /* only send SHUTDOWN the first time through */
13383                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13384                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13385                                 }
13386                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13387                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13388                                 sctp_stop_timers_for_shutdown(stcb);
13389                                 if (stcb->asoc.alternate) {
13390                                         netp = stcb->asoc.alternate;
13391                                 } else {
13392                                         netp = stcb->asoc.primary_destination;
13393                                 }
13394                                 sctp_send_shutdown(stcb, netp);
13395                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13396                                     netp);
13397                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13398                                     asoc->primary_destination);
13399                         }
13400                 } else {
13401                         /*-
13402                          * we still got (or just got) data to send, so set
13403                          * SHUTDOWN_PENDING
13404                          */
13405                         /*-
13406                          * XXX sockets draft says that SCTP_EOF should be
13407                          * sent with no data.  currently, we will allow user
13408                          * data to be sent first and move to
13409                          * SHUTDOWN-PENDING
13410                          */
13411                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13412                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13413                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13414                                 if (hold_tcblock == 0) {
13415                                         SCTP_TCB_LOCK(stcb);
13416                                         hold_tcblock = 1;
13417                                 }
13418                                 if (asoc->locked_on_sending) {
13419                                         /* Locked to send out the data */
13420                                         struct sctp_stream_queue_pending *sp;
13421
13422                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13423                                         if (sp) {
13424                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13425                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13426                                         }
13427                                 }
13428                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13429                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13430                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13431                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13432                                         struct mbuf *op_err;
13433                                         char msg[SCTP_DIAG_INFO_LEN];
13434
13435                         abort_anyway:
13436                                         if (free_cnt_applied) {
13437                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13438                                                 free_cnt_applied = 0;
13439                                         }
13440                                         snprintf(msg, sizeof(msg),
13441                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13442                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13443                                             msg);
13444                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13445                                             op_err, SCTP_SO_LOCKED);
13446                                         /*
13447                                          * now relock the stcb so everything
13448                                          * is sane
13449                                          */
13450                                         hold_tcblock = 0;
13451                                         stcb = NULL;
13452                                         goto out;
13453                                 }
13454                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13455                                     asoc->primary_destination);
13456                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13457                         }
13458                 }
13459         }
13460 skip_out_eof:
13461         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13462                 some_on_control = 1;
13463         }
13464         if (queue_only_for_init) {
13465                 if (hold_tcblock == 0) {
13466                         SCTP_TCB_LOCK(stcb);
13467                         hold_tcblock = 1;
13468                 }
13469                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13470                         /* a collision took us forward? */
13471                         queue_only = 0;
13472                 } else {
13473                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13474                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13475                         queue_only = 1;
13476                 }
13477         }
13478         if ((net->flight_size > net->cwnd) &&
13479             (stcb->asoc.sctp_cmt_on_off == 0)) {
13480                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13481                 queue_only = 1;
13482         } else if (asoc->ifp_had_enobuf) {
13483                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13484                 if (net->flight_size > (2 * net->mtu)) {
13485                         queue_only = 1;
13486                 }
13487                 asoc->ifp_had_enobuf = 0;
13488         }
13489         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13490             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13491         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13492             (stcb->asoc.total_flight > 0) &&
13493             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13494             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13495                 /*-
13496                  * Ok, Nagle is set on and we have data outstanding.
13497                  * Don't send anything and let SACKs drive out the
13498                  * data unless wen have a "full" segment to send.
13499                  */
13500                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13501                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13502                 }
13503                 SCTP_STAT_INCR(sctps_naglequeued);
13504                 nagle_applies = 1;
13505         } else {
13506                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13507                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13508                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13509                 }
13510                 SCTP_STAT_INCR(sctps_naglesent);
13511                 nagle_applies = 0;
13512         }
13513         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13514                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13515                     nagle_applies, un_sent);
13516                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13517                     stcb->asoc.total_flight,
13518                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13519         }
13520         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13521                 /* we can attempt to send too. */
13522                 if (hold_tcblock == 0) {
13523                         /*
13524                          * If there is activity recv'ing sacks no need to
13525                          * send
13526                          */
13527                         if (SCTP_TCB_TRYLOCK(stcb)) {
13528                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13529                                 hold_tcblock = 1;
13530                         }
13531                 } else {
13532                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13533                 }
13534         } else if ((queue_only == 0) &&
13535                     (stcb->asoc.peers_rwnd == 0) &&
13536             (stcb->asoc.total_flight == 0)) {
13537                 /* We get to have a probe outstanding */
13538                 if (hold_tcblock == 0) {
13539                         hold_tcblock = 1;
13540                         SCTP_TCB_LOCK(stcb);
13541                 }
13542                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13543         } else if (some_on_control) {
13544                 int num_out, reason, frag_point;
13545
13546                 /* Here we do control only */
13547                 if (hold_tcblock == 0) {
13548                         hold_tcblock = 1;
13549                         SCTP_TCB_LOCK(stcb);
13550                 }
13551                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13552                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13553                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13554         }
13555         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13556             queue_only, stcb->asoc.peers_rwnd, un_sent,
13557             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13558             stcb->asoc.total_output_queue_size, error);
13559
13560 out:
13561 out_unlocked:
13562
13563         if (local_soresv && stcb) {
13564                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13565         }
13566         if (create_lock_applied) {
13567                 SCTP_ASOC_CREATE_UNLOCK(inp);
13568         }
13569         if ((stcb) && hold_tcblock) {
13570                 SCTP_TCB_UNLOCK(stcb);
13571         }
13572         if (stcb && free_cnt_applied) {
13573                 atomic_add_int(&stcb->asoc.refcnt, -1);
13574         }
13575 #ifdef INVARIANTS
13576         if (stcb) {
13577                 if (mtx_owned(&stcb->tcb_mtx)) {
13578                         panic("Leaving with tcb mtx owned?");
13579                 }
13580                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13581                         panic("Leaving with tcb send mtx owned?");
13582                 }
13583         }
13584 #endif
13585         if (top) {
13586                 sctp_m_freem(top);
13587         }
13588         if (control) {
13589                 sctp_m_freem(control);
13590         }
13591         return (error);
13592 }
13593
13594
13595 /*
13596  * generate an AUTHentication chunk, if required
13597  */
13598 struct mbuf *
13599 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13600     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13601     struct sctp_tcb *stcb, uint8_t chunk)
13602 {
13603         struct mbuf *m_auth;
13604         struct sctp_auth_chunk *auth;
13605         int chunk_len;
13606         struct mbuf *cn;
13607
13608         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13609             (stcb == NULL))
13610                 return (m);
13611
13612         if (stcb->asoc.auth_supported == 0) {
13613                 return (m);
13614         }
13615         /* does the requested chunk require auth? */
13616         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13617                 return (m);
13618         }
13619         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13620         if (m_auth == NULL) {
13621                 /* no mbuf's */
13622                 return (m);
13623         }
13624         /* reserve some space if this will be the first mbuf */
13625         if (m == NULL)
13626                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13627         /* fill in the AUTH chunk details */
13628         auth = mtod(m_auth, struct sctp_auth_chunk *);
13629         bzero(auth, sizeof(*auth));
13630         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13631         auth->ch.chunk_flags = 0;
13632         chunk_len = sizeof(*auth) +
13633             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13634         auth->ch.chunk_length = htons(chunk_len);
13635         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13636         /* key id and hmac digest will be computed and filled in upon send */
13637
13638         /* save the offset where the auth was inserted into the chain */
13639         *offset = 0;
13640         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13641                 *offset += SCTP_BUF_LEN(cn);
13642         }
13643
13644         /* update length and return pointer to the auth chunk */
13645         SCTP_BUF_LEN(m_auth) = chunk_len;
13646         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13647         if (auth_ret != NULL)
13648                 *auth_ret = auth;
13649
13650         return (m);
13651 }
13652
13653 #ifdef INET6
13654 int
13655 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13656 {
13657         struct nd_prefix *pfx = NULL;
13658         struct nd_pfxrouter *pfxrtr = NULL;
13659         struct sockaddr_in6 gw6;
13660
13661         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13662                 return (0);
13663
13664         /* get prefix entry of address */
13665         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13666                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13667                         continue;
13668                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13669                     &src6->sin6_addr, &pfx->ndpr_mask))
13670                         break;
13671         }
13672         /* no prefix entry in the prefix list */
13673         if (pfx == NULL) {
13674                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13675                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13676                 return (0);
13677         }
13678         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13679         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13680
13681         /* search installed gateway from prefix entry */
13682         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13683                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13684                 gw6.sin6_family = AF_INET6;
13685                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13686                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13687                     sizeof(struct in6_addr));
13688                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13689                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13690                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13691                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13692                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13693                     ro->ro_rt->rt_gateway)) {
13694                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13695                         return (1);
13696                 }
13697         }
13698         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13699         return (0);
13700 }
13701
13702 #endif
13703
13704 int
13705 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13706 {
13707 #ifdef INET
13708         struct sockaddr_in *sin, *mask;
13709         struct ifaddr *ifa;
13710         struct in_addr srcnetaddr, gwnetaddr;
13711
13712         if (ro == NULL || ro->ro_rt == NULL ||
13713             sifa->address.sa.sa_family != AF_INET) {
13714                 return (0);
13715         }
13716         ifa = (struct ifaddr *)sifa->ifa;
13717         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13718         sin = &sifa->address.sin;
13719         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13720         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13721         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13722         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13723
13724         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13725         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13726         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13727         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13728         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13729         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13730                 return (1);
13731         }
13732 #endif
13733         return (0);
13734 }