sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59
  60
  61 #define SCTP_MAX_GAPS_INARRAY 4
  62 struct sack_track {
  63         uint8_t right_edge;     /* mergable on the right edge */
  64         uint8_t left_edge;      /* mergable on the left edge */
  65         uint8_t num_entries;
  66         uint8_t spare;
  67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  68 };
  69
  70 const struct sack_track sack_array[256] = {
  71         {0, 0, 0, 0,            /* 0x00 */
  72                 {{0, 0},
  73                 {0, 0},
  74                 {0, 0},
  75                 {0, 0}
  76                 }
  77         },
  78         {1, 0, 1, 0,            /* 0x01 */
  79                 {{0, 0},
  80                 {0, 0},
  81                 {0, 0},
  82                 {0, 0}
  83                 }
  84         },
  85         {0, 0, 1, 0,            /* 0x02 */
  86                 {{1, 1},
  87                 {0, 0},
  88                 {0, 0},
  89                 {0, 0}
  90                 }
  91         },
  92         {1, 0, 1, 0,            /* 0x03 */
  93                 {{0, 1},
  94                 {0, 0},
  95                 {0, 0},
  96                 {0, 0}
  97                 }
  98         },
  99         {0, 0, 1, 0,            /* 0x04 */
 100                 {{2, 2},
 101                 {0, 0},
 102                 {0, 0},
 103                 {0, 0}
 104                 }
 105         },
 106         {1, 0, 2, 0,            /* 0x05 */
 107                 {{0, 0},
 108                 {2, 2},
 109                 {0, 0},
 110                 {0, 0}
 111                 }
 112         },
 113         {0, 0, 1, 0,            /* 0x06 */
 114                 {{1, 2},
 115                 {0, 0},
 116                 {0, 0},
 117                 {0, 0}
 118                 }
 119         },
 120         {1, 0, 1, 0,            /* 0x07 */
 121                 {{0, 2},
 122                 {0, 0},
 123                 {0, 0},
 124                 {0, 0}
 125                 }
 126         },
 127         {0, 0, 1, 0,            /* 0x08 */
 128                 {{3, 3},
 129                 {0, 0},
 130                 {0, 0},
 131                 {0, 0}
 132                 }
 133         },
 134         {1, 0, 2, 0,            /* 0x09 */
 135                 {{0, 0},
 136                 {3, 3},
 137                 {0, 0},
 138                 {0, 0}
 139                 }
 140         },
 141         {0, 0, 2, 0,            /* 0x0a */
 142                 {{1, 1},
 143                 {3, 3},
 144                 {0, 0},
 145                 {0, 0}
 146                 }
 147         },
 148         {1, 0, 2, 0,            /* 0x0b */
 149                 {{0, 1},
 150                 {3, 3},
 151                 {0, 0},
 152                 {0, 0}
 153                 }
 154         },
 155         {0, 0, 1, 0,            /* 0x0c */
 156                 {{2, 3},
 157                 {0, 0},
 158                 {0, 0},
 159                 {0, 0}
 160                 }
 161         },
 162         {1, 0, 2, 0,            /* 0x0d */
 163                 {{0, 0},
 164                 {2, 3},
 165                 {0, 0},
 166                 {0, 0}
 167                 }
 168         },
 169         {0, 0, 1, 0,            /* 0x0e */
 170                 {{1, 3},
 171                 {0, 0},
 172                 {0, 0},
 173                 {0, 0}
 174                 }
 175         },
 176         {1, 0, 1, 0,            /* 0x0f */
 177                 {{0, 3},
 178                 {0, 0},
 179                 {0, 0},
 180                 {0, 0}
 181                 }
 182         },
 183         {0, 0, 1, 0,            /* 0x10 */
 184                 {{4, 4},
 185                 {0, 0},
 186                 {0, 0},
 187                 {0, 0}
 188                 }
 189         },
 190         {1, 0, 2, 0,            /* 0x11 */
 191                 {{0, 0},
 192                 {4, 4},
 193                 {0, 0},
 194                 {0, 0}
 195                 }
 196         },
 197         {0, 0, 2, 0,            /* 0x12 */
 198                 {{1, 1},
 199                 {4, 4},
 200                 {0, 0},
 201                 {0, 0}
 202                 }
 203         },
 204         {1, 0, 2, 0,            /* 0x13 */
 205                 {{0, 1},
 206                 {4, 4},
 207                 {0, 0},
 208                 {0, 0}
 209                 }
 210         },
 211         {0, 0, 2, 0,            /* 0x14 */
 212                 {{2, 2},
 213                 {4, 4},
 214                 {0, 0},
 215                 {0, 0}
 216                 }
 217         },
 218         {1, 0, 3, 0,            /* 0x15 */
 219                 {{0, 0},
 220                 {2, 2},
 221                 {4, 4},
 222                 {0, 0}
 223                 }
 224         },
 225         {0, 0, 2, 0,            /* 0x16 */
 226                 {{1, 2},
 227                 {4, 4},
 228                 {0, 0},
 229                 {0, 0}
 230                 }
 231         },
 232         {1, 0, 2, 0,            /* 0x17 */
 233                 {{0, 2},
 234                 {4, 4},
 235                 {0, 0},
 236                 {0, 0}
 237                 }
 238         },
 239         {0, 0, 1, 0,            /* 0x18 */
 240                 {{3, 4},
 241                 {0, 0},
 242                 {0, 0},
 243                 {0, 0}
 244                 }
 245         },
 246         {1, 0, 2, 0,            /* 0x19 */
 247                 {{0, 0},
 248                 {3, 4},
 249                 {0, 0},
 250                 {0, 0}
 251                 }
 252         },
 253         {0, 0, 2, 0,            /* 0x1a */
 254                 {{1, 1},
 255                 {3, 4},
 256                 {0, 0},
 257                 {0, 0}
 258                 }
 259         },
 260         {1, 0, 2, 0,            /* 0x1b */
 261                 {{0, 1},
 262                 {3, 4},
 263                 {0, 0},
 264                 {0, 0}
 265                 }
 266         },
 267         {0, 0, 1, 0,            /* 0x1c */
 268                 {{2, 4},
 269                 {0, 0},
 270                 {0, 0},
 271                 {0, 0}
 272                 }
 273         },
 274         {1, 0, 2, 0,            /* 0x1d */
 275                 {{0, 0},
 276                 {2, 4},
 277                 {0, 0},
 278                 {0, 0}
 279                 }
 280         },
 281         {0, 0, 1, 0,            /* 0x1e */
 282                 {{1, 4},
 283                 {0, 0},
 284                 {0, 0},
 285                 {0, 0}
 286                 }
 287         },
 288         {1, 0, 1, 0,            /* 0x1f */
 289                 {{0, 4},
 290                 {0, 0},
 291                 {0, 0},
 292                 {0, 0}
 293                 }
 294         },
 295         {0, 0, 1, 0,            /* 0x20 */
 296                 {{5, 5},
 297                 {0, 0},
 298                 {0, 0},
 299                 {0, 0}
 300                 }
 301         },
 302         {1, 0, 2, 0,            /* 0x21 */
 303                 {{0, 0},
 304                 {5, 5},
 305                 {0, 0},
 306                 {0, 0}
 307                 }
 308         },
 309         {0, 0, 2, 0,            /* 0x22 */
 310                 {{1, 1},
 311                 {5, 5},
 312                 {0, 0},
 313                 {0, 0}
 314                 }
 315         },
 316         {1, 0, 2, 0,            /* 0x23 */
 317                 {{0, 1},
 318                 {5, 5},
 319                 {0, 0},
 320                 {0, 0}
 321                 }
 322         },
 323         {0, 0, 2, 0,            /* 0x24 */
 324                 {{2, 2},
 325                 {5, 5},
 326                 {0, 0},
 327                 {0, 0}
 328                 }
 329         },
 330         {1, 0, 3, 0,            /* 0x25 */
 331                 {{0, 0},
 332                 {2, 2},
 333                 {5, 5},
 334                 {0, 0}
 335                 }
 336         },
 337         {0, 0, 2, 0,            /* 0x26 */
 338                 {{1, 2},
 339                 {5, 5},
 340                 {0, 0},
 341                 {0, 0}
 342                 }
 343         },
 344         {1, 0, 2, 0,            /* 0x27 */
 345                 {{0, 2},
 346                 {5, 5},
 347                 {0, 0},
 348                 {0, 0}
 349                 }
 350         },
 351         {0, 0, 2, 0,            /* 0x28 */
 352                 {{3, 3},
 353                 {5, 5},
 354                 {0, 0},
 355                 {0, 0}
 356                 }
 357         },
 358         {1, 0, 3, 0,            /* 0x29 */
 359                 {{0, 0},
 360                 {3, 3},
 361                 {5, 5},
 362                 {0, 0}
 363                 }
 364         },
 365         {0, 0, 3, 0,            /* 0x2a */
 366                 {{1, 1},
 367                 {3, 3},
 368                 {5, 5},
 369                 {0, 0}
 370                 }
 371         },
 372         {1, 0, 3, 0,            /* 0x2b */
 373                 {{0, 1},
 374                 {3, 3},
 375                 {5, 5},
 376                 {0, 0}
 377                 }
 378         },
 379         {0, 0, 2, 0,            /* 0x2c */
 380                 {{2, 3},
 381                 {5, 5},
 382                 {0, 0},
 383                 {0, 0}
 384                 }
 385         },
 386         {1, 0, 3, 0,            /* 0x2d */
 387                 {{0, 0},
 388                 {2, 3},
 389                 {5, 5},
 390                 {0, 0}
 391                 }
 392         },
 393         {0, 0, 2, 0,            /* 0x2e */
 394                 {{1, 3},
 395                 {5, 5},
 396                 {0, 0},
 397                 {0, 0}
 398                 }
 399         },
 400         {1, 0, 2, 0,            /* 0x2f */
 401                 {{0, 3},
 402                 {5, 5},
 403                 {0, 0},
 404                 {0, 0}
 405                 }
 406         },
 407         {0, 0, 1, 0,            /* 0x30 */
 408                 {{4, 5},
 409                 {0, 0},
 410                 {0, 0},
 411                 {0, 0}
 412                 }
 413         },
 414         {1, 0, 2, 0,            /* 0x31 */
 415                 {{0, 0},
 416                 {4, 5},
 417                 {0, 0},
 418                 {0, 0}
 419                 }
 420         },
 421         {0, 0, 2, 0,            /* 0x32 */
 422                 {{1, 1},
 423                 {4, 5},
 424                 {0, 0},
 425                 {0, 0}
 426                 }
 427         },
 428         {1, 0, 2, 0,            /* 0x33 */
 429                 {{0, 1},
 430                 {4, 5},
 431                 {0, 0},
 432                 {0, 0}
 433                 }
 434         },
 435         {0, 0, 2, 0,            /* 0x34 */
 436                 {{2, 2},
 437                 {4, 5},
 438                 {0, 0},
 439                 {0, 0}
 440                 }
 441         },
 442         {1, 0, 3, 0,            /* 0x35 */
 443                 {{0, 0},
 444                 {2, 2},
 445                 {4, 5},
 446                 {0, 0}
 447                 }
 448         },
 449         {0, 0, 2, 0,            /* 0x36 */
 450                 {{1, 2},
 451                 {4, 5},
 452                 {0, 0},
 453                 {0, 0}
 454                 }
 455         },
 456         {1, 0, 2, 0,            /* 0x37 */
 457                 {{0, 2},
 458                 {4, 5},
 459                 {0, 0},
 460                 {0, 0}
 461                 }
 462         },
 463         {0, 0, 1, 0,            /* 0x38 */
 464                 {{3, 5},
 465                 {0, 0},
 466                 {0, 0},
 467                 {0, 0}
 468                 }
 469         },
 470         {1, 0, 2, 0,            /* 0x39 */
 471                 {{0, 0},
 472                 {3, 5},
 473                 {0, 0},
 474                 {0, 0}
 475                 }
 476         },
 477         {0, 0, 2, 0,            /* 0x3a */
 478                 {{1, 1},
 479                 {3, 5},
 480                 {0, 0},
 481                 {0, 0}
 482                 }
 483         },
 484         {1, 0, 2, 0,            /* 0x3b */
 485                 {{0, 1},
 486                 {3, 5},
 487                 {0, 0},
 488                 {0, 0}
 489                 }
 490         },
 491         {0, 0, 1, 0,            /* 0x3c */
 492                 {{2, 5},
 493                 {0, 0},
 494                 {0, 0},
 495                 {0, 0}
 496                 }
 497         },
 498         {1, 0, 2, 0,            /* 0x3d */
 499                 {{0, 0},
 500                 {2, 5},
 501                 {0, 0},
 502                 {0, 0}
 503                 }
 504         },
 505         {0, 0, 1, 0,            /* 0x3e */
 506                 {{1, 5},
 507                 {0, 0},
 508                 {0, 0},
 509                 {0, 0}
 510                 }
 511         },
 512         {1, 0, 1, 0,            /* 0x3f */
 513                 {{0, 5},
 514                 {0, 0},
 515                 {0, 0},
 516                 {0, 0}
 517                 }
 518         },
 519         {0, 0, 1, 0,            /* 0x40 */
 520                 {{6, 6},
 521                 {0, 0},
 522                 {0, 0},
 523                 {0, 0}
 524                 }
 525         },
 526         {1, 0, 2, 0,            /* 0x41 */
 527                 {{0, 0},
 528                 {6, 6},
 529                 {0, 0},
 530                 {0, 0}
 531                 }
 532         },
 533         {0, 0, 2, 0,            /* 0x42 */
 534                 {{1, 1},
 535                 {6, 6},
 536                 {0, 0},
 537                 {0, 0}
 538                 }
 539         },
 540         {1, 0, 2, 0,            /* 0x43 */
 541                 {{0, 1},
 542                 {6, 6},
 543                 {0, 0},
 544                 {0, 0}
 545                 }
 546         },
 547         {0, 0, 2, 0,            /* 0x44 */
 548                 {{2, 2},
 549                 {6, 6},
 550                 {0, 0},
 551                 {0, 0}
 552                 }
 553         },
 554         {1, 0, 3, 0,            /* 0x45 */
 555                 {{0, 0},
 556                 {2, 2},
 557                 {6, 6},
 558                 {0, 0}
 559                 }
 560         },
 561         {0, 0, 2, 0,            /* 0x46 */
 562                 {{1, 2},
 563                 {6, 6},
 564                 {0, 0},
 565                 {0, 0}
 566                 }
 567         },
 568         {1, 0, 2, 0,            /* 0x47 */
 569                 {{0, 2},
 570                 {6, 6},
 571                 {0, 0},
 572                 {0, 0}
 573                 }
 574         },
 575         {0, 0, 2, 0,            /* 0x48 */
 576                 {{3, 3},
 577                 {6, 6},
 578                 {0, 0},
 579                 {0, 0}
 580                 }
 581         },
 582         {1, 0, 3, 0,            /* 0x49 */
 583                 {{0, 0},
 584                 {3, 3},
 585                 {6, 6},
 586                 {0, 0}
 587                 }
 588         },
 589         {0, 0, 3, 0,            /* 0x4a */
 590                 {{1, 1},
 591                 {3, 3},
 592                 {6, 6},
 593                 {0, 0}
 594                 }
 595         },
 596         {1, 0, 3, 0,            /* 0x4b */
 597                 {{0, 1},
 598                 {3, 3},
 599                 {6, 6},
 600                 {0, 0}
 601                 }
 602         },
 603         {0, 0, 2, 0,            /* 0x4c */
 604                 {{2, 3},
 605                 {6, 6},
 606                 {0, 0},
 607                 {0, 0}
 608                 }
 609         },
 610         {1, 0, 3, 0,            /* 0x4d */
 611                 {{0, 0},
 612                 {2, 3},
 613                 {6, 6},
 614                 {0, 0}
 615                 }
 616         },
 617         {0, 0, 2, 0,            /* 0x4e */
 618                 {{1, 3},
 619                 {6, 6},
 620                 {0, 0},
 621                 {0, 0}
 622                 }
 623         },
 624         {1, 0, 2, 0,            /* 0x4f */
 625                 {{0, 3},
 626                 {6, 6},
 627                 {0, 0},
 628                 {0, 0}
 629                 }
 630         },
 631         {0, 0, 2, 0,            /* 0x50 */
 632                 {{4, 4},
 633                 {6, 6},
 634                 {0, 0},
 635                 {0, 0}
 636                 }
 637         },
 638         {1, 0, 3, 0,            /* 0x51 */
 639                 {{0, 0},
 640                 {4, 4},
 641                 {6, 6},
 642                 {0, 0}
 643                 }
 644         },
 645         {0, 0, 3, 0,            /* 0x52 */
 646                 {{1, 1},
 647                 {4, 4},
 648                 {6, 6},
 649                 {0, 0}
 650                 }
 651         },
 652         {1, 0, 3, 0,            /* 0x53 */
 653                 {{0, 1},
 654                 {4, 4},
 655                 {6, 6},
 656                 {0, 0}
 657                 }
 658         },
 659         {0, 0, 3, 0,            /* 0x54 */
 660                 {{2, 2},
 661                 {4, 4},
 662                 {6, 6},
 663                 {0, 0}
 664                 }
 665         },
 666         {1, 0, 4, 0,            /* 0x55 */
 667                 {{0, 0},
 668                 {2, 2},
 669                 {4, 4},
 670                 {6, 6}
 671                 }
 672         },
 673         {0, 0, 3, 0,            /* 0x56 */
 674                 {{1, 2},
 675                 {4, 4},
 676                 {6, 6},
 677                 {0, 0}
 678                 }
 679         },
 680         {1, 0, 3, 0,            /* 0x57 */
 681                 {{0, 2},
 682                 {4, 4},
 683                 {6, 6},
 684                 {0, 0}
 685                 }
 686         },
 687         {0, 0, 2, 0,            /* 0x58 */
 688                 {{3, 4},
 689                 {6, 6},
 690                 {0, 0},
 691                 {0, 0}
 692                 }
 693         },
 694         {1, 0, 3, 0,            /* 0x59 */
 695                 {{0, 0},
 696                 {3, 4},
 697                 {6, 6},
 698                 {0, 0}
 699                 }
 700         },
 701         {0, 0, 3, 0,            /* 0x5a */
 702                 {{1, 1},
 703                 {3, 4},
 704                 {6, 6},
 705                 {0, 0}
 706                 }
 707         },
 708         {1, 0, 3, 0,            /* 0x5b */
 709                 {{0, 1},
 710                 {3, 4},
 711                 {6, 6},
 712                 {0, 0}
 713                 }
 714         },
 715         {0, 0, 2, 0,            /* 0x5c */
 716                 {{2, 4},
 717                 {6, 6},
 718                 {0, 0},
 719                 {0, 0}
 720                 }
 721         },
 722         {1, 0, 3, 0,            /* 0x5d */
 723                 {{0, 0},
 724                 {2, 4},
 725                 {6, 6},
 726                 {0, 0}
 727                 }
 728         },
 729         {0, 0, 2, 0,            /* 0x5e */
 730                 {{1, 4},
 731                 {6, 6},
 732                 {0, 0},
 733                 {0, 0}
 734                 }
 735         },
 736         {1, 0, 2, 0,            /* 0x5f */
 737                 {{0, 4},
 738                 {6, 6},
 739                 {0, 0},
 740                 {0, 0}
 741                 }
 742         },
 743         {0, 0, 1, 0,            /* 0x60 */
 744                 {{5, 6},
 745                 {0, 0},
 746                 {0, 0},
 747                 {0, 0}
 748                 }
 749         },
 750         {1, 0, 2, 0,            /* 0x61 */
 751                 {{0, 0},
 752                 {5, 6},
 753                 {0, 0},
 754                 {0, 0}
 755                 }
 756         },
 757         {0, 0, 2, 0,            /* 0x62 */
 758                 {{1, 1},
 759                 {5, 6},
 760                 {0, 0},
 761                 {0, 0}
 762                 }
 763         },
 764         {1, 0, 2, 0,            /* 0x63 */
 765                 {{0, 1},
 766                 {5, 6},
 767                 {0, 0},
 768                 {0, 0}
 769                 }
 770         },
 771         {0, 0, 2, 0,            /* 0x64 */
 772                 {{2, 2},
 773                 {5, 6},
 774                 {0, 0},
 775                 {0, 0}
 776                 }
 777         },
 778         {1, 0, 3, 0,            /* 0x65 */
 779                 {{0, 0},
 780                 {2, 2},
 781                 {5, 6},
 782                 {0, 0}
 783                 }
 784         },
 785         {0, 0, 2, 0,            /* 0x66 */
 786                 {{1, 2},
 787                 {5, 6},
 788                 {0, 0},
 789                 {0, 0}
 790                 }
 791         },
 792         {1, 0, 2, 0,            /* 0x67 */
 793                 {{0, 2},
 794                 {5, 6},
 795                 {0, 0},
 796                 {0, 0}
 797                 }
 798         },
 799         {0, 0, 2, 0,            /* 0x68 */
 800                 {{3, 3},
 801                 {5, 6},
 802                 {0, 0},
 803                 {0, 0}
 804                 }
 805         },
 806         {1, 0, 3, 0,            /* 0x69 */
 807                 {{0, 0},
 808                 {3, 3},
 809                 {5, 6},
 810                 {0, 0}
 811                 }
 812         },
 813         {0, 0, 3, 0,            /* 0x6a */
 814                 {{1, 1},
 815                 {3, 3},
 816                 {5, 6},
 817                 {0, 0}
 818                 }
 819         },
 820         {1, 0, 3, 0,            /* 0x6b */
 821                 {{0, 1},
 822                 {3, 3},
 823                 {5, 6},
 824                 {0, 0}
 825                 }
 826         },
 827         {0, 0, 2, 0,            /* 0x6c */
 828                 {{2, 3},
 829                 {5, 6},
 830                 {0, 0},
 831                 {0, 0}
 832                 }
 833         },
 834         {1, 0, 3, 0,            /* 0x6d */
 835                 {{0, 0},
 836                 {2, 3},
 837                 {5, 6},
 838                 {0, 0}
 839                 }
 840         },
 841         {0, 0, 2, 0,            /* 0x6e */
 842                 {{1, 3},
 843                 {5, 6},
 844                 {0, 0},
 845                 {0, 0}
 846                 }
 847         },
 848         {1, 0, 2, 0,            /* 0x6f */
 849                 {{0, 3},
 850                 {5, 6},
 851                 {0, 0},
 852                 {0, 0}
 853                 }
 854         },
 855         {0, 0, 1, 0,            /* 0x70 */
 856                 {{4, 6},
 857                 {0, 0},
 858                 {0, 0},
 859                 {0, 0}
 860                 }
 861         },
 862         {1, 0, 2, 0,            /* 0x71 */
 863                 {{0, 0},
 864                 {4, 6},
 865                 {0, 0},
 866                 {0, 0}
 867                 }
 868         },
 869         {0, 0, 2, 0,            /* 0x72 */
 870                 {{1, 1},
 871                 {4, 6},
 872                 {0, 0},
 873                 {0, 0}
 874                 }
 875         },
 876         {1, 0, 2, 0,            /* 0x73 */
 877                 {{0, 1},
 878                 {4, 6},
 879                 {0, 0},
 880                 {0, 0}
 881                 }
 882         },
 883         {0, 0, 2, 0,            /* 0x74 */
 884                 {{2, 2},
 885                 {4, 6},
 886                 {0, 0},
 887                 {0, 0}
 888                 }
 889         },
 890         {1, 0, 3, 0,            /* 0x75 */
 891                 {{0, 0},
 892                 {2, 2},
 893                 {4, 6},
 894                 {0, 0}
 895                 }
 896         },
 897         {0, 0, 2, 0,            /* 0x76 */
 898                 {{1, 2},
 899                 {4, 6},
 900                 {0, 0},
 901                 {0, 0}
 902                 }
 903         },
 904         {1, 0, 2, 0,            /* 0x77 */
 905                 {{0, 2},
 906                 {4, 6},
 907                 {0, 0},
 908                 {0, 0}
 909                 }
 910         },
 911         {0, 0, 1, 0,            /* 0x78 */
 912                 {{3, 6},
 913                 {0, 0},
 914                 {0, 0},
 915                 {0, 0}
 916                 }
 917         },
 918         {1, 0, 2, 0,            /* 0x79 */
 919                 {{0, 0},
 920                 {3, 6},
 921                 {0, 0},
 922                 {0, 0}
 923                 }
 924         },
 925         {0, 0, 2, 0,            /* 0x7a */
 926                 {{1, 1},
 927                 {3, 6},
 928                 {0, 0},
 929                 {0, 0}
 930                 }
 931         },
 932         {1, 0, 2, 0,            /* 0x7b */
 933                 {{0, 1},
 934                 {3, 6},
 935                 {0, 0},
 936                 {0, 0}
 937                 }
 938         },
 939         {0, 0, 1, 0,            /* 0x7c */
 940                 {{2, 6},
 941                 {0, 0},
 942                 {0, 0},
 943                 {0, 0}
 944                 }
 945         },
 946         {1, 0, 2, 0,            /* 0x7d */
 947                 {{0, 0},
 948                 {2, 6},
 949                 {0, 0},
 950                 {0, 0}
 951                 }
 952         },
 953         {0, 0, 1, 0,            /* 0x7e */
 954                 {{1, 6},
 955                 {0, 0},
 956                 {0, 0},
 957                 {0, 0}
 958                 }
 959         },
 960         {1, 0, 1, 0,            /* 0x7f */
 961                 {{0, 6},
 962                 {0, 0},
 963                 {0, 0},
 964                 {0, 0}
 965                 }
 966         },
 967         {0, 1, 1, 0,            /* 0x80 */
 968                 {{7, 7},
 969                 {0, 0},
 970                 {0, 0},
 971                 {0, 0}
 972                 }
 973         },
 974         {1, 1, 2, 0,            /* 0x81 */
 975                 {{0, 0},
 976                 {7, 7},
 977                 {0, 0},
 978                 {0, 0}
 979                 }
 980         },
 981         {0, 1, 2, 0,            /* 0x82 */
 982                 {{1, 1},
 983                 {7, 7},
 984                 {0, 0},
 985                 {0, 0}
 986                 }
 987         },
 988         {1, 1, 2, 0,            /* 0x83 */
 989                 {{0, 1},
 990                 {7, 7},
 991                 {0, 0},
 992                 {0, 0}
 993                 }
 994         },
 995         {0, 1, 2, 0,            /* 0x84 */
 996                 {{2, 2},
 997                 {7, 7},
 998                 {0, 0},
 999                 {0, 0}
1000                 }
1001         },
1002         {1, 1, 3, 0,            /* 0x85 */
1003                 {{0, 0},
1004                 {2, 2},
1005                 {7, 7},
1006                 {0, 0}
1007                 }
1008         },
1009         {0, 1, 2, 0,            /* 0x86 */
1010                 {{1, 2},
1011                 {7, 7},
1012                 {0, 0},
1013                 {0, 0}
1014                 }
1015         },
1016         {1, 1, 2, 0,            /* 0x87 */
1017                 {{0, 2},
1018                 {7, 7},
1019                 {0, 0},
1020                 {0, 0}
1021                 }
1022         },
1023         {0, 1, 2, 0,            /* 0x88 */
1024                 {{3, 3},
1025                 {7, 7},
1026                 {0, 0},
1027                 {0, 0}
1028                 }
1029         },
1030         {1, 1, 3, 0,            /* 0x89 */
1031                 {{0, 0},
1032                 {3, 3},
1033                 {7, 7},
1034                 {0, 0}
1035                 }
1036         },
1037         {0, 1, 3, 0,            /* 0x8a */
1038                 {{1, 1},
1039                 {3, 3},
1040                 {7, 7},
1041                 {0, 0}
1042                 }
1043         },
1044         {1, 1, 3, 0,            /* 0x8b */
1045                 {{0, 1},
1046                 {3, 3},
1047                 {7, 7},
1048                 {0, 0}
1049                 }
1050         },
1051         {0, 1, 2, 0,            /* 0x8c */
1052                 {{2, 3},
1053                 {7, 7},
1054                 {0, 0},
1055                 {0, 0}
1056                 }
1057         },
1058         {1, 1, 3, 0,            /* 0x8d */
1059                 {{0, 0},
1060                 {2, 3},
1061                 {7, 7},
1062                 {0, 0}
1063                 }
1064         },
1065         {0, 1, 2, 0,            /* 0x8e */
1066                 {{1, 3},
1067                 {7, 7},
1068                 {0, 0},
1069                 {0, 0}
1070                 }
1071         },
1072         {1, 1, 2, 0,            /* 0x8f */
1073                 {{0, 3},
1074                 {7, 7},
1075                 {0, 0},
1076                 {0, 0}
1077                 }
1078         },
1079         {0, 1, 2, 0,            /* 0x90 */
1080                 {{4, 4},
1081                 {7, 7},
1082                 {0, 0},
1083                 {0, 0}
1084                 }
1085         },
1086         {1, 1, 3, 0,            /* 0x91 */
1087                 {{0, 0},
1088                 {4, 4},
1089                 {7, 7},
1090                 {0, 0}
1091                 }
1092         },
1093         {0, 1, 3, 0,            /* 0x92 */
1094                 {{1, 1},
1095                 {4, 4},
1096                 {7, 7},
1097                 {0, 0}
1098                 }
1099         },
1100         {1, 1, 3, 0,            /* 0x93 */
1101                 {{0, 1},
1102                 {4, 4},
1103                 {7, 7},
1104                 {0, 0}
1105                 }
1106         },
1107         {0, 1, 3, 0,            /* 0x94 */
1108                 {{2, 2},
1109                 {4, 4},
1110                 {7, 7},
1111                 {0, 0}
1112                 }
1113         },
1114         {1, 1, 4, 0,            /* 0x95 */
1115                 {{0, 0},
1116                 {2, 2},
1117                 {4, 4},
1118                 {7, 7}
1119                 }
1120         },
1121         {0, 1, 3, 0,            /* 0x96 */
1122                 {{1, 2},
1123                 {4, 4},
1124                 {7, 7},
1125                 {0, 0}
1126                 }
1127         },
1128         {1, 1, 3, 0,            /* 0x97 */
1129                 {{0, 2},
1130                 {4, 4},
1131                 {7, 7},
1132                 {0, 0}
1133                 }
1134         },
1135         {0, 1, 2, 0,            /* 0x98 */
1136                 {{3, 4},
1137                 {7, 7},
1138                 {0, 0},
1139                 {0, 0}
1140                 }
1141         },
1142         {1, 1, 3, 0,            /* 0x99 */
1143                 {{0, 0},
1144                 {3, 4},
1145                 {7, 7},
1146                 {0, 0}
1147                 }
1148         },
1149         {0, 1, 3, 0,            /* 0x9a */
1150                 {{1, 1},
1151                 {3, 4},
1152                 {7, 7},
1153                 {0, 0}
1154                 }
1155         },
1156         {1, 1, 3, 0,            /* 0x9b */
1157                 {{0, 1},
1158                 {3, 4},
1159                 {7, 7},
1160                 {0, 0}
1161                 }
1162         },
1163         {0, 1, 2, 0,            /* 0x9c */
1164                 {{2, 4},
1165                 {7, 7},
1166                 {0, 0},
1167                 {0, 0}
1168                 }
1169         },
1170         {1, 1, 3, 0,            /* 0x9d */
1171                 {{0, 0},
1172                 {2, 4},
1173                 {7, 7},
1174                 {0, 0}
1175                 }
1176         },
1177         {0, 1, 2, 0,            /* 0x9e */
1178                 {{1, 4},
1179                 {7, 7},
1180                 {0, 0},
1181                 {0, 0}
1182                 }
1183         },
1184         {1, 1, 2, 0,            /* 0x9f */
1185                 {{0, 4},
1186                 {7, 7},
1187                 {0, 0},
1188                 {0, 0}
1189                 }
1190         },
1191         {0, 1, 2, 0,            /* 0xa0 */
1192                 {{5, 5},
1193                 {7, 7},
1194                 {0, 0},
1195                 {0, 0}
1196                 }
1197         },
1198         {1, 1, 3, 0,            /* 0xa1 */
1199                 {{0, 0},
1200                 {5, 5},
1201                 {7, 7},
1202                 {0, 0}
1203                 }
1204         },
1205         {0, 1, 3, 0,            /* 0xa2 */
1206                 {{1, 1},
1207                 {5, 5},
1208                 {7, 7},
1209                 {0, 0}
1210                 }
1211         },
1212         {1, 1, 3, 0,            /* 0xa3 */
1213                 {{0, 1},
1214                 {5, 5},
1215                 {7, 7},
1216                 {0, 0}
1217                 }
1218         },
1219         {0, 1, 3, 0,            /* 0xa4 */
1220                 {{2, 2},
1221                 {5, 5},
1222                 {7, 7},
1223                 {0, 0}
1224                 }
1225         },
1226         {1, 1, 4, 0,            /* 0xa5 */
1227                 {{0, 0},
1228                 {2, 2},
1229                 {5, 5},
1230                 {7, 7}
1231                 }
1232         },
1233         {0, 1, 3, 0,            /* 0xa6 */
1234                 {{1, 2},
1235                 {5, 5},
1236                 {7, 7},
1237                 {0, 0}
1238                 }
1239         },
1240         {1, 1, 3, 0,            /* 0xa7 */
1241                 {{0, 2},
1242                 {5, 5},
1243                 {7, 7},
1244                 {0, 0}
1245                 }
1246         },
1247         {0, 1, 3, 0,            /* 0xa8 */
1248                 {{3, 3},
1249                 {5, 5},
1250                 {7, 7},
1251                 {0, 0}
1252                 }
1253         },
1254         {1, 1, 4, 0,            /* 0xa9 */
1255                 {{0, 0},
1256                 {3, 3},
1257                 {5, 5},
1258                 {7, 7}
1259                 }
1260         },
1261         {0, 1, 4, 0,            /* 0xaa */
1262                 {{1, 1},
1263                 {3, 3},
1264                 {5, 5},
1265                 {7, 7}
1266                 }
1267         },
1268         {1, 1, 4, 0,            /* 0xab */
1269                 {{0, 1},
1270                 {3, 3},
1271                 {5, 5},
1272                 {7, 7}
1273                 }
1274         },
1275         {0, 1, 3, 0,            /* 0xac */
1276                 {{2, 3},
1277                 {5, 5},
1278                 {7, 7},
1279                 {0, 0}
1280                 }
1281         },
1282         {1, 1, 4, 0,            /* 0xad */
1283                 {{0, 0},
1284                 {2, 3},
1285                 {5, 5},
1286                 {7, 7}
1287                 }
1288         },
1289         {0, 1, 3, 0,            /* 0xae */
1290                 {{1, 3},
1291                 {5, 5},
1292                 {7, 7},
1293                 {0, 0}
1294                 }
1295         },
1296         {1, 1, 3, 0,            /* 0xaf */
1297                 {{0, 3},
1298                 {5, 5},
1299                 {7, 7},
1300                 {0, 0}
1301                 }
1302         },
1303         {0, 1, 2, 0,            /* 0xb0 */
1304                 {{4, 5},
1305                 {7, 7},
1306                 {0, 0},
1307                 {0, 0}
1308                 }
1309         },
1310         {1, 1, 3, 0,            /* 0xb1 */
1311                 {{0, 0},
1312                 {4, 5},
1313                 {7, 7},
1314                 {0, 0}
1315                 }
1316         },
1317         {0, 1, 3, 0,            /* 0xb2 */
1318                 {{1, 1},
1319                 {4, 5},
1320                 {7, 7},
1321                 {0, 0}
1322                 }
1323         },
1324         {1, 1, 3, 0,            /* 0xb3 */
1325                 {{0, 1},
1326                 {4, 5},
1327                 {7, 7},
1328                 {0, 0}
1329                 }
1330         },
1331         {0, 1, 3, 0,            /* 0xb4 */
1332                 {{2, 2},
1333                 {4, 5},
1334                 {7, 7},
1335                 {0, 0}
1336                 }
1337         },
1338         {1, 1, 4, 0,            /* 0xb5 */
1339                 {{0, 0},
1340                 {2, 2},
1341                 {4, 5},
1342                 {7, 7}
1343                 }
1344         },
1345         {0, 1, 3, 0,            /* 0xb6 */
1346                 {{1, 2},
1347                 {4, 5},
1348                 {7, 7},
1349                 {0, 0}
1350                 }
1351         },
1352         {1, 1, 3, 0,            /* 0xb7 */
1353                 {{0, 2},
1354                 {4, 5},
1355                 {7, 7},
1356                 {0, 0}
1357                 }
1358         },
1359         {0, 1, 2, 0,            /* 0xb8 */
1360                 {{3, 5},
1361                 {7, 7},
1362                 {0, 0},
1363                 {0, 0}
1364                 }
1365         },
1366         {1, 1, 3, 0,            /* 0xb9 */
1367                 {{0, 0},
1368                 {3, 5},
1369                 {7, 7},
1370                 {0, 0}
1371                 }
1372         },
1373         {0, 1, 3, 0,            /* 0xba */
1374                 {{1, 1},
1375                 {3, 5},
1376                 {7, 7},
1377                 {0, 0}
1378                 }
1379         },
1380         {1, 1, 3, 0,            /* 0xbb */
1381                 {{0, 1},
1382                 {3, 5},
1383                 {7, 7},
1384                 {0, 0}
1385                 }
1386         },
1387         {0, 1, 2, 0,            /* 0xbc */
1388                 {{2, 5},
1389                 {7, 7},
1390                 {0, 0},
1391                 {0, 0}
1392                 }
1393         },
1394         {1, 1, 3, 0,            /* 0xbd */
1395                 {{0, 0},
1396                 {2, 5},
1397                 {7, 7},
1398                 {0, 0}
1399                 }
1400         },
1401         {0, 1, 2, 0,            /* 0xbe */
1402                 {{1, 5},
1403                 {7, 7},
1404                 {0, 0},
1405                 {0, 0}
1406                 }
1407         },
1408         {1, 1, 2, 0,            /* 0xbf */
1409                 {{0, 5},
1410                 {7, 7},
1411                 {0, 0},
1412                 {0, 0}
1413                 }
1414         },
1415         {0, 1, 1, 0,            /* 0xc0 */
1416                 {{6, 7},
1417                 {0, 0},
1418                 {0, 0},
1419                 {0, 0}
1420                 }
1421         },
1422         {1, 1, 2, 0,            /* 0xc1 */
1423                 {{0, 0},
1424                 {6, 7},
1425                 {0, 0},
1426                 {0, 0}
1427                 }
1428         },
1429         {0, 1, 2, 0,            /* 0xc2 */
1430                 {{1, 1},
1431                 {6, 7},
1432                 {0, 0},
1433                 {0, 0}
1434                 }
1435         },
1436         {1, 1, 2, 0,            /* 0xc3 */
1437                 {{0, 1},
1438                 {6, 7},
1439                 {0, 0},
1440                 {0, 0}
1441                 }
1442         },
1443         {0, 1, 2, 0,            /* 0xc4 */
1444                 {{2, 2},
1445                 {6, 7},
1446                 {0, 0},
1447                 {0, 0}
1448                 }
1449         },
1450         {1, 1, 3, 0,            /* 0xc5 */
1451                 {{0, 0},
1452                 {2, 2},
1453                 {6, 7},
1454                 {0, 0}
1455                 }
1456         },
1457         {0, 1, 2, 0,            /* 0xc6 */
1458                 {{1, 2},
1459                 {6, 7},
1460                 {0, 0},
1461                 {0, 0}
1462                 }
1463         },
1464         {1, 1, 2, 0,            /* 0xc7 */
1465                 {{0, 2},
1466                 {6, 7},
1467                 {0, 0},
1468                 {0, 0}
1469                 }
1470         },
1471         {0, 1, 2, 0,            /* 0xc8 */
1472                 {{3, 3},
1473                 {6, 7},
1474                 {0, 0},
1475                 {0, 0}
1476                 }
1477         },
1478         {1, 1, 3, 0,            /* 0xc9 */
1479                 {{0, 0},
1480                 {3, 3},
1481                 {6, 7},
1482                 {0, 0}
1483                 }
1484         },
1485         {0, 1, 3, 0,            /* 0xca */
1486                 {{1, 1},
1487                 {3, 3},
1488                 {6, 7},
1489                 {0, 0}
1490                 }
1491         },
1492         {1, 1, 3, 0,            /* 0xcb */
1493                 {{0, 1},
1494                 {3, 3},
1495                 {6, 7},
1496                 {0, 0}
1497                 }
1498         },
1499         {0, 1, 2, 0,            /* 0xcc */
1500                 {{2, 3},
1501                 {6, 7},
1502                 {0, 0},
1503                 {0, 0}
1504                 }
1505         },
1506         {1, 1, 3, 0,            /* 0xcd */
1507                 {{0, 0},
1508                 {2, 3},
1509                 {6, 7},
1510                 {0, 0}
1511                 }
1512         },
1513         {0, 1, 2, 0,            /* 0xce */
1514                 {{1, 3},
1515                 {6, 7},
1516                 {0, 0},
1517                 {0, 0}
1518                 }
1519         },
1520         {1, 1, 2, 0,            /* 0xcf */
1521                 {{0, 3},
1522                 {6, 7},
1523                 {0, 0},
1524                 {0, 0}
1525                 }
1526         },
1527         {0, 1, 2, 0,            /* 0xd0 */
1528                 {{4, 4},
1529                 {6, 7},
1530                 {0, 0},
1531                 {0, 0}
1532                 }
1533         },
1534         {1, 1, 3, 0,            /* 0xd1 */
1535                 {{0, 0},
1536                 {4, 4},
1537                 {6, 7},
1538                 {0, 0}
1539                 }
1540         },
1541         {0, 1, 3, 0,            /* 0xd2 */
1542                 {{1, 1},
1543                 {4, 4},
1544                 {6, 7},
1545                 {0, 0}
1546                 }
1547         },
1548         {1, 1, 3, 0,            /* 0xd3 */
1549                 {{0, 1},
1550                 {4, 4},
1551                 {6, 7},
1552                 {0, 0}
1553                 }
1554         },
1555         {0, 1, 3, 0,            /* 0xd4 */
1556                 {{2, 2},
1557                 {4, 4},
1558                 {6, 7},
1559                 {0, 0}
1560                 }
1561         },
1562         {1, 1, 4, 0,            /* 0xd5 */
1563                 {{0, 0},
1564                 {2, 2},
1565                 {4, 4},
1566                 {6, 7}
1567                 }
1568         },
1569         {0, 1, 3, 0,            /* 0xd6 */
1570                 {{1, 2},
1571                 {4, 4},
1572                 {6, 7},
1573                 {0, 0}
1574                 }
1575         },
1576         {1, 1, 3, 0,            /* 0xd7 */
1577                 {{0, 2},
1578                 {4, 4},
1579                 {6, 7},
1580                 {0, 0}
1581                 }
1582         },
1583         {0, 1, 2, 0,            /* 0xd8 */
1584                 {{3, 4},
1585                 {6, 7},
1586                 {0, 0},
1587                 {0, 0}
1588                 }
1589         },
1590         {1, 1, 3, 0,            /* 0xd9 */
1591                 {{0, 0},
1592                 {3, 4},
1593                 {6, 7},
1594                 {0, 0}
1595                 }
1596         },
1597         {0, 1, 3, 0,            /* 0xda */
1598                 {{1, 1},
1599                 {3, 4},
1600                 {6, 7},
1601                 {0, 0}
1602                 }
1603         },
1604         {1, 1, 3, 0,            /* 0xdb */
1605                 {{0, 1},
1606                 {3, 4},
1607                 {6, 7},
1608                 {0, 0}
1609                 }
1610         },
1611         {0, 1, 2, 0,            /* 0xdc */
1612                 {{2, 4},
1613                 {6, 7},
1614                 {0, 0},
1615                 {0, 0}
1616                 }
1617         },
1618         {1, 1, 3, 0,            /* 0xdd */
1619                 {{0, 0},
1620                 {2, 4},
1621                 {6, 7},
1622                 {0, 0}
1623                 }
1624         },
1625         {0, 1, 2, 0,            /* 0xde */
1626                 {{1, 4},
1627                 {6, 7},
1628                 {0, 0},
1629                 {0, 0}
1630                 }
1631         },
1632         {1, 1, 2, 0,            /* 0xdf */
1633                 {{0, 4},
1634                 {6, 7},
1635                 {0, 0},
1636                 {0, 0}
1637                 }
1638         },
1639         {0, 1, 1, 0,            /* 0xe0 */
1640                 {{5, 7},
1641                 {0, 0},
1642                 {0, 0},
1643                 {0, 0}
1644                 }
1645         },
1646         {1, 1, 2, 0,            /* 0xe1 */
1647                 {{0, 0},
1648                 {5, 7},
1649                 {0, 0},
1650                 {0, 0}
1651                 }
1652         },
1653         {0, 1, 2, 0,            /* 0xe2 */
1654                 {{1, 1},
1655                 {5, 7},
1656                 {0, 0},
1657                 {0, 0}
1658                 }
1659         },
1660         {1, 1, 2, 0,            /* 0xe3 */
1661                 {{0, 1},
1662                 {5, 7},
1663                 {0, 0},
1664                 {0, 0}
1665                 }
1666         },
1667         {0, 1, 2, 0,            /* 0xe4 */
1668                 {{2, 2},
1669                 {5, 7},
1670                 {0, 0},
1671                 {0, 0}
1672                 }
1673         },
1674         {1, 1, 3, 0,            /* 0xe5 */
1675                 {{0, 0},
1676                 {2, 2},
1677                 {5, 7},
1678                 {0, 0}
1679                 }
1680         },
1681         {0, 1, 2, 0,            /* 0xe6 */
1682                 {{1, 2},
1683                 {5, 7},
1684                 {0, 0},
1685                 {0, 0}
1686                 }
1687         },
1688         {1, 1, 2, 0,            /* 0xe7 */
1689                 {{0, 2},
1690                 {5, 7},
1691                 {0, 0},
1692                 {0, 0}
1693                 }
1694         },
1695         {0, 1, 2, 0,            /* 0xe8 */
1696                 {{3, 3},
1697                 {5, 7},
1698                 {0, 0},
1699                 {0, 0}
1700                 }
1701         },
1702         {1, 1, 3, 0,            /* 0xe9 */
1703                 {{0, 0},
1704                 {3, 3},
1705                 {5, 7},
1706                 {0, 0}
1707                 }
1708         },
1709         {0, 1, 3, 0,            /* 0xea */
1710                 {{1, 1},
1711                 {3, 3},
1712                 {5, 7},
1713                 {0, 0}
1714                 }
1715         },
1716         {1, 1, 3, 0,            /* 0xeb */
1717                 {{0, 1},
1718                 {3, 3},
1719                 {5, 7},
1720                 {0, 0}
1721                 }
1722         },
1723         {0, 1, 2, 0,            /* 0xec */
1724                 {{2, 3},
1725                 {5, 7},
1726                 {0, 0},
1727                 {0, 0}
1728                 }
1729         },
1730         {1, 1, 3, 0,            /* 0xed */
1731                 {{0, 0},
1732                 {2, 3},
1733                 {5, 7},
1734                 {0, 0}
1735                 }
1736         },
1737         {0, 1, 2, 0,            /* 0xee */
1738                 {{1, 3},
1739                 {5, 7},
1740                 {0, 0},
1741                 {0, 0}
1742                 }
1743         },
1744         {1, 1, 2, 0,            /* 0xef */
1745                 {{0, 3},
1746                 {5, 7},
1747                 {0, 0},
1748                 {0, 0}
1749                 }
1750         },
1751         {0, 1, 1, 0,            /* 0xf0 */
1752                 {{4, 7},
1753                 {0, 0},
1754                 {0, 0},
1755                 {0, 0}
1756                 }
1757         },
1758         {1, 1, 2, 0,            /* 0xf1 */
1759                 {{0, 0},
1760                 {4, 7},
1761                 {0, 0},
1762                 {0, 0}
1763                 }
1764         },
1765         {0, 1, 2, 0,            /* 0xf2 */
1766                 {{1, 1},
1767                 {4, 7},
1768                 {0, 0},
1769                 {0, 0}
1770                 }
1771         },
1772         {1, 1, 2, 0,            /* 0xf3 */
1773                 {{0, 1},
1774                 {4, 7},
1775                 {0, 0},
1776                 {0, 0}
1777                 }
1778         },
1779         {0, 1, 2, 0,            /* 0xf4 */
1780                 {{2, 2},
1781                 {4, 7},
1782                 {0, 0},
1783                 {0, 0}
1784                 }
1785         },
1786         {1, 1, 3, 0,            /* 0xf5 */
1787                 {{0, 0},
1788                 {2, 2},
1789                 {4, 7},
1790                 {0, 0}
1791                 }
1792         },
1793         {0, 1, 2, 0,            /* 0xf6 */
1794                 {{1, 2},
1795                 {4, 7},
1796                 {0, 0},
1797                 {0, 0}
1798                 }
1799         },
1800         {1, 1, 2, 0,            /* 0xf7 */
1801                 {{0, 2},
1802                 {4, 7},
1803                 {0, 0},
1804                 {0, 0}
1805                 }
1806         },
1807         {0, 1, 1, 0,            /* 0xf8 */
1808                 {{3, 7},
1809                 {0, 0},
1810                 {0, 0},
1811                 {0, 0}
1812                 }
1813         },
1814         {1, 1, 2, 0,            /* 0xf9 */
1815                 {{0, 0},
1816                 {3, 7},
1817                 {0, 0},
1818                 {0, 0}
1819                 }
1820         },
1821         {0, 1, 2, 0,            /* 0xfa */
1822                 {{1, 1},
1823                 {3, 7},
1824                 {0, 0},
1825                 {0, 0}
1826                 }
1827         },
1828         {1, 1, 2, 0,            /* 0xfb */
1829                 {{0, 1},
1830                 {3, 7},
1831                 {0, 0},
1832                 {0, 0}
1833                 }
1834         },
1835         {0, 1, 1, 0,            /* 0xfc */
1836                 {{2, 7},
1837                 {0, 0},
1838                 {0, 0},
1839                 {0, 0}
1840                 }
1841         },
1842         {1, 1, 2, 0,            /* 0xfd */
1843                 {{0, 0},
1844                 {2, 7},
1845                 {0, 0},
1846                 {0, 0}
1847                 }
1848         },
1849         {0, 1, 1, 0,            /* 0xfe */
1850                 {{1, 7},
1851                 {0, 0},
1852                 {0, 0},
1853                 {0, 0}
1854                 }
1855         },
1856         {1, 1, 1, 0,            /* 0xff */
1857                 {{0, 7},
1858                 {0, 0},
1859                 {0, 0},
1860                 {0, 0}
1861                 }
1862         }
1863 };
1864
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *paramh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946 #endif
1947
1948         switch (ifa->address.sa.sa_family) {
1949 #ifdef INET
1950         case AF_INET:
1951                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952                 break;
1953 #endif
1954 #ifdef INET6
1955         case AF_INET6:
1956                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957                 break;
1958 #endif
1959         default:
1960                 return (m);
1961         }
1962 #if defined(INET) || defined(INET6)
1963         if (M_TRAILINGSPACE(m) >= plen) {
1964                 /* easy side we just drop it on the end */
1965                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 paramh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = &ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1991                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         paramh->param_length = htons(plen);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += plen;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = &ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2006                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         paramh->param_length = htons(plen);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += plen;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         if (len != NULL) {
2020                 *len += plen;
2021         }
2022         return (mret);
2023 #endif
2024 }
2025
2026
2027 struct mbuf *
2028 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2029     struct sctp_scoping *scope,
2030     struct mbuf *m_at, int cnt_inits_to,
2031     uint16_t *padding_len, uint16_t *chunk_len)
2032 {
2033         struct sctp_vrf *vrf = NULL;
2034         int cnt, limit_out = 0, total_count;
2035         uint32_t vrf_id;
2036
2037         vrf_id = inp->def_vrf_id;
2038         SCTP_IPI_ADDR_RLOCK();
2039         vrf = sctp_find_vrf(vrf_id);
2040         if (vrf == NULL) {
2041                 SCTP_IPI_ADDR_RUNLOCK();
2042                 return (m_at);
2043         }
2044         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2045                 struct sctp_ifa *sctp_ifap;
2046                 struct sctp_ifn *sctp_ifnp;
2047
2048                 cnt = cnt_inits_to;
2049                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2050                         limit_out = 1;
2051                         cnt = SCTP_ADDRESS_LIMIT;
2052                         goto skip_count;
2053                 }
2054                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2055                         if ((scope->loopback_scope == 0) &&
2056                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2057                                 /*
2058                                  * Skip loopback devices if loopback_scope
2059                                  * not set
2060                                  */
2061                                 continue;
2062                         }
2063                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2064 #ifdef INET
2065                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2066                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2067                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2068                                         continue;
2069                                 }
2070 #endif
2071 #ifdef INET6
2072                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2073                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2074                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2075                                         continue;
2076                                 }
2077 #endif
2078                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2079                                         continue;
2080                                 }
2081                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2082                                         continue;
2083                                 }
2084                                 cnt++;
2085                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2086                                         break;
2087                                 }
2088                         }
2089                         if (cnt > SCTP_ADDRESS_LIMIT) {
2090                                 break;
2091                         }
2092                 }
2093 skip_count:
2094                 if (cnt > 1) {
2095                         total_count = 0;
2096                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2097                                 cnt = 0;
2098                                 if ((scope->loopback_scope == 0) &&
2099                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2100                                         /*
2101                                          * Skip loopback devices if
2102                                          * loopback_scope not set
2103                                          */
2104                                         continue;
2105                                 }
2106                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2107 #ifdef INET
2108                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2109                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2110                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2111                                                 continue;
2112                                         }
2113 #endif
2114 #ifdef INET6
2115                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2116                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2117                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2118                                                 continue;
2119                                         }
2120 #endif
2121                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2122                                                 continue;
2123                                         }
2124                                         if (sctp_is_address_in_scope(sctp_ifap,
2125                                             scope, 0) == 0) {
2126                                                 continue;
2127                                         }
2128                                         if ((chunk_len != NULL) &&
2129                                             (padding_len != NULL) &&
2130                                             (*padding_len > 0)) {
2131                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2132                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2133                                                 *chunk_len += *padding_len;
2134                                                 *padding_len = 0;
2135                                         }
2136                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2137                                         if (limit_out) {
2138                                                 cnt++;
2139                                                 total_count++;
2140                                                 if (cnt >= 2) {
2141                                                         /*
2142                                                          * two from each
2143                                                          * address
2144                                                          */
2145                                                         break;
2146                                                 }
2147                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2148                                                         /* No more addresses */
2149                                                         break;
2150                                                 }
2151                                         }
2152                                 }
2153                         }
2154                 }
2155         } else {
2156                 struct sctp_laddr *laddr;
2157
2158                 cnt = cnt_inits_to;
2159                 /* First, how many ? */
2160                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2161                         if (laddr->ifa == NULL) {
2162                                 continue;
2163                         }
2164                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2165                                 /*
2166                                  * Address being deleted by the system, dont
2167                                  * list.
2168                                  */
2169                                 continue;
2170                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2171                                 /*
2172                                  * Address being deleted on this ep don't
2173                                  * list.
2174                                  */
2175                                 continue;
2176                         }
2177                         if (sctp_is_address_in_scope(laddr->ifa,
2178                             scope, 1) == 0) {
2179                                 continue;
2180                         }
2181                         cnt++;
2182                 }
2183                 /*
2184                  * To get through a NAT we only list addresses if we have
2185                  * more than one. That way if you just bind a single address
2186                  * we let the source of the init dictate our address.
2187                  */
2188                 if (cnt > 1) {
2189                         cnt = cnt_inits_to;
2190                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2191                                 if (laddr->ifa == NULL) {
2192                                         continue;
2193                                 }
2194                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2195                                         continue;
2196                                 }
2197                                 if (sctp_is_address_in_scope(laddr->ifa,
2198                                     scope, 0) == 0) {
2199                                         continue;
2200                                 }
2201                                 if ((chunk_len != NULL) &&
2202                                     (padding_len != NULL) &&
2203                                     (*padding_len > 0)) {
2204                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2205                                         SCTP_BUF_LEN(m_at) += *padding_len;
2206                                         *chunk_len += *padding_len;
2207                                         *padding_len = 0;
2208                                 }
2209                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2210                                 cnt++;
2211                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2212                                         break;
2213                                 }
2214                         }
2215                 }
2216         }
2217         SCTP_IPI_ADDR_RUNLOCK();
2218         return (m_at);
2219 }
2220
2221 static struct sctp_ifa *
2222 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2223     uint8_t dest_is_loop,
2224     uint8_t dest_is_priv,
2225     sa_family_t fam)
2226 {
2227         uint8_t dest_is_global = 0;
2228
2229         /* dest_is_priv is true if destination is a private address */
2230         /* dest_is_loop is true if destination is a loopback addresses */
2231
2232         /**
2233          * Here we determine if its a preferred address. A preferred address
2234          * means it is the same scope or higher scope then the destination.
2235          * L = loopback, P = private, G = global
2236          * -----------------------------------------
2237          *    src    |  dest | result
2238          *  ----------------------------------------
2239          *     L     |    L  |    yes
2240          *  -----------------------------------------
2241          *     P     |    L  |    yes-v4 no-v6
2242          *  -----------------------------------------
2243          *     G     |    L  |    yes-v4 no-v6
2244          *  -----------------------------------------
2245          *     L     |    P  |    no
2246          *  -----------------------------------------
2247          *     P     |    P  |    yes
2248          *  -----------------------------------------
2249          *     G     |    P  |    no
2250          *   -----------------------------------------
2251          *     L     |    G  |    no
2252          *   -----------------------------------------
2253          *     P     |    G  |    no
2254          *    -----------------------------------------
2255          *     G     |    G  |    yes
2256          *    -----------------------------------------
2257          */
2258
2259         if (ifa->address.sa.sa_family != fam) {
2260                 /* forget mis-matched family */
2261                 return (NULL);
2262         }
2263         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2264                 dest_is_global = 1;
2265         }
2266         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2267         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2268         /* Ok the address may be ok */
2269 #ifdef INET6
2270         if (fam == AF_INET6) {
2271                 /* ok to use deprecated addresses? no lets not! */
2272                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2273                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2274                         return (NULL);
2275                 }
2276                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2277                         if (dest_is_loop) {
2278                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2279                                 return (NULL);
2280                         }
2281                 }
2282                 if (ifa->src_is_glob) {
2283                         if (dest_is_loop) {
2284                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2285                                 return (NULL);
2286                         }
2287                 }
2288         }
2289 #endif
2290         /*
2291          * Now that we know what is what, implement or table this could in
2292          * theory be done slicker (it used to be), but this is
2293          * straightforward and easier to validate :-)
2294          */
2295         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2296             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2297         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2298             dest_is_loop, dest_is_priv, dest_is_global);
2299
2300         if ((ifa->src_is_loop) && (dest_is_priv)) {
2301                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2302                 return (NULL);
2303         }
2304         if ((ifa->src_is_glob) && (dest_is_priv)) {
2305                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2306                 return (NULL);
2307         }
2308         if ((ifa->src_is_loop) && (dest_is_global)) {
2309                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2310                 return (NULL);
2311         }
2312         if ((ifa->src_is_priv) && (dest_is_global)) {
2313                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2314                 return (NULL);
2315         }
2316         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2317         /* its a preferred address */
2318         return (ifa);
2319 }
2320
2321 static struct sctp_ifa *
2322 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2323     uint8_t dest_is_loop,
2324     uint8_t dest_is_priv,
2325     sa_family_t fam)
2326 {
2327         uint8_t dest_is_global = 0;
2328
2329         /**
2330          * Here we determine if its a acceptable address. A acceptable
2331          * address means it is the same scope or higher scope but we can
2332          * allow for NAT which means its ok to have a global dest and a
2333          * private src.
2334          *
2335          * L = loopback, P = private, G = global
2336          * -----------------------------------------
2337          *  src    |  dest | result
2338          * -----------------------------------------
2339          *   L     |   L   |    yes
2340          *  -----------------------------------------
2341          *   P     |   L   |    yes-v4 no-v6
2342          *  -----------------------------------------
2343          *   G     |   L   |    yes
2344          * -----------------------------------------
2345          *   L     |   P   |    no
2346          * -----------------------------------------
2347          *   P     |   P   |    yes
2348          * -----------------------------------------
2349          *   G     |   P   |    yes - May not work
2350          * -----------------------------------------
2351          *   L     |   G   |    no
2352          * -----------------------------------------
2353          *   P     |   G   |    yes - May not work
2354          * -----------------------------------------
2355          *   G     |   G   |    yes
2356          * -----------------------------------------
2357          */
2358
2359         if (ifa->address.sa.sa_family != fam) {
2360                 /* forget non matching family */
2361                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2362                     ifa->address.sa.sa_family, fam);
2363                 return (NULL);
2364         }
2365         /* Ok the address may be ok */
2366         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2367         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2368             dest_is_loop, dest_is_priv);
2369         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2370                 dest_is_global = 1;
2371         }
2372 #ifdef INET6
2373         if (fam == AF_INET6) {
2374                 /* ok to use deprecated addresses? */
2375                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2376                         return (NULL);
2377                 }
2378                 if (ifa->src_is_priv) {
2379                         /* Special case, linklocal to loop */
2380                         if (dest_is_loop)
2381                                 return (NULL);
2382                 }
2383         }
2384 #endif
2385         /*
2386          * Now that we know what is what, implement our table. This could in
2387          * theory be done slicker (it used to be), but this is
2388          * straightforward and easier to validate :-)
2389          */
2390         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2391             ifa->src_is_loop,
2392             dest_is_priv);
2393         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2394                 return (NULL);
2395         }
2396         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2397             ifa->src_is_loop,
2398             dest_is_global);
2399         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2400                 return (NULL);
2401         }
2402         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2403         /* its an acceptable address */
2404         return (ifa);
2405 }
2406
2407 int
2408 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2409 {
2410         struct sctp_laddr *laddr;
2411
2412         if (stcb == NULL) {
2413                 /* There are no restrictions, no TCB :-) */
2414                 return (0);
2415         }
2416         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2417                 if (laddr->ifa == NULL) {
2418                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2419                             __func__);
2420                         continue;
2421                 }
2422                 if (laddr->ifa == ifa) {
2423                         /* Yes it is on the list */
2424                         return (1);
2425                 }
2426         }
2427         return (0);
2428 }
2429
2430
2431 int
2432 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2433 {
2434         struct sctp_laddr *laddr;
2435
2436         if (ifa == NULL)
2437                 return (0);
2438         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2439                 if (laddr->ifa == NULL) {
2440                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2441                             __func__);
2442                         continue;
2443                 }
2444                 if ((laddr->ifa == ifa) && laddr->action == 0)
2445                         /* same pointer */
2446                         return (1);
2447         }
2448         return (0);
2449 }
2450
2451
2452
2453 static struct sctp_ifa *
2454 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2455     sctp_route_t *ro,
2456     uint32_t vrf_id,
2457     int non_asoc_addr_ok,
2458     uint8_t dest_is_priv,
2459     uint8_t dest_is_loop,
2460     sa_family_t fam)
2461 {
2462         struct sctp_laddr *laddr, *starting_point;
2463         void *ifn;
2464         int resettotop = 0;
2465         struct sctp_ifn *sctp_ifn;
2466         struct sctp_ifa *sctp_ifa, *sifa;
2467         struct sctp_vrf *vrf;
2468         uint32_t ifn_index;
2469
2470         vrf = sctp_find_vrf(vrf_id);
2471         if (vrf == NULL)
2472                 return (NULL);
2473
2474         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2475         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2476         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2477         /*
2478          * first question, is the ifn we will emit on in our list, if so, we
2479          * want such an address. Note that we first looked for a preferred
2480          * address.
2481          */
2482         if (sctp_ifn) {
2483                 /* is a preferred one on the interface we route out? */
2484                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2485 #ifdef INET
2486                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2487                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2488                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2489                                 continue;
2490                         }
2491 #endif
2492 #ifdef INET6
2493                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2494                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2495                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2496                                 continue;
2497                         }
2498 #endif
2499                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2500                             (non_asoc_addr_ok == 0))
2501                                 continue;
2502                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2503                             dest_is_loop,
2504                             dest_is_priv, fam);
2505                         if (sifa == NULL)
2506                                 continue;
2507                         if (sctp_is_addr_in_ep(inp, sifa)) {
2508                                 atomic_add_int(&sifa->refcount, 1);
2509                                 return (sifa);
2510                         }
2511                 }
2512         }
2513         /*
2514          * ok, now we now need to find one on the list of the addresses. We
2515          * can't get one on the emitting interface so let's find first a
2516          * preferred one. If not that an acceptable one otherwise... we
2517          * return NULL.
2518          */
2519         starting_point = inp->next_addr_touse;
2520 once_again:
2521         if (inp->next_addr_touse == NULL) {
2522                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2523                 resettotop = 1;
2524         }
2525         for (laddr = inp->next_addr_touse; laddr;
2526             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2527                 if (laddr->ifa == NULL) {
2528                         /* address has been removed */
2529                         continue;
2530                 }
2531                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2532                         /* address is being deleted */
2533                         continue;
2534                 }
2535                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2536                     dest_is_priv, fam);
2537                 if (sifa == NULL)
2538                         continue;
2539                 atomic_add_int(&sifa->refcount, 1);
2540                 return (sifa);
2541         }
2542         if (resettotop == 0) {
2543                 inp->next_addr_touse = NULL;
2544                 goto once_again;
2545         }
2546         inp->next_addr_touse = starting_point;
2547         resettotop = 0;
2548 once_again_too:
2549         if (inp->next_addr_touse == NULL) {
2550                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2551                 resettotop = 1;
2552         }
2553         /* ok, what about an acceptable address in the inp */
2554         for (laddr = inp->next_addr_touse; laddr;
2555             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2556                 if (laddr->ifa == NULL) {
2557                         /* address has been removed */
2558                         continue;
2559                 }
2560                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2561                         /* address is being deleted */
2562                         continue;
2563                 }
2564                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2565                     dest_is_priv, fam);
2566                 if (sifa == NULL)
2567                         continue;
2568                 atomic_add_int(&sifa->refcount, 1);
2569                 return (sifa);
2570         }
2571         if (resettotop == 0) {
2572                 inp->next_addr_touse = NULL;
2573                 goto once_again_too;
2574         }
2575         /*
2576          * no address bound can be a source for the destination we are in
2577          * trouble
2578          */
2579         return (NULL);
2580 }
2581
2582
2583
2584 static struct sctp_ifa *
2585 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2586     struct sctp_tcb *stcb,
2587     sctp_route_t *ro,
2588     uint32_t vrf_id,
2589     uint8_t dest_is_priv,
2590     uint8_t dest_is_loop,
2591     int non_asoc_addr_ok,
2592     sa_family_t fam)
2593 {
2594         struct sctp_laddr *laddr, *starting_point;
2595         void *ifn;
2596         struct sctp_ifn *sctp_ifn;
2597         struct sctp_ifa *sctp_ifa, *sifa;
2598         uint8_t start_at_beginning = 0;
2599         struct sctp_vrf *vrf;
2600         uint32_t ifn_index;
2601
2602         /*
2603          * first question, is the ifn we will emit on in our list, if so, we
2604          * want that one.
2605          */
2606         vrf = sctp_find_vrf(vrf_id);
2607         if (vrf == NULL)
2608                 return (NULL);
2609
2610         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2611         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2612         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2613
2614         /*
2615          * first question, is the ifn we will emit on in our list?  If so,
2616          * we want that one. First we look for a preferred. Second, we go
2617          * for an acceptable.
2618          */
2619         if (sctp_ifn) {
2620                 /* first try for a preferred address on the ep */
2621                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2622 #ifdef INET
2623                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2624                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2625                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2626                                 continue;
2627                         }
2628 #endif
2629 #ifdef INET6
2630                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2631                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2632                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2633                                 continue;
2634                         }
2635 #endif
2636                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2637                                 continue;
2638                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2639                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2640                                 if (sifa == NULL)
2641                                         continue;
2642                                 if (((non_asoc_addr_ok == 0) &&
2643                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2644                                     (non_asoc_addr_ok &&
2645                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2646                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2647                                         /* on the no-no list */
2648                                         continue;
2649                                 }
2650                                 atomic_add_int(&sifa->refcount, 1);
2651                                 return (sifa);
2652                         }
2653                 }
2654                 /* next try for an acceptable address on the ep */
2655                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2656 #ifdef INET
2657                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2658                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2659                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2660                                 continue;
2661                         }
2662 #endif
2663 #ifdef INET6
2664                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2665                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2666                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2667                                 continue;
2668                         }
2669 #endif
2670                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2671                                 continue;
2672                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2673                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2674                                 if (sifa == NULL)
2675                                         continue;
2676                                 if (((non_asoc_addr_ok == 0) &&
2677                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2678                                     (non_asoc_addr_ok &&
2679                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2680                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2681                                         /* on the no-no list */
2682                                         continue;
2683                                 }
2684                                 atomic_add_int(&sifa->refcount, 1);
2685                                 return (sifa);
2686                         }
2687                 }
2688
2689         }
2690         /*
2691          * if we can't find one like that then we must look at all addresses
2692          * bound to pick one at first preferable then secondly acceptable.
2693          */
2694         starting_point = stcb->asoc.last_used_address;
2695 sctp_from_the_top:
2696         if (stcb->asoc.last_used_address == NULL) {
2697                 start_at_beginning = 1;
2698                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2699         }
2700         /* search beginning with the last used address */
2701         for (laddr = stcb->asoc.last_used_address; laddr;
2702             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2703                 if (laddr->ifa == NULL) {
2704                         /* address has been removed */
2705                         continue;
2706                 }
2707                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2708                         /* address is being deleted */
2709                         continue;
2710                 }
2711                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2712                 if (sifa == NULL)
2713                         continue;
2714                 if (((non_asoc_addr_ok == 0) &&
2715                     (sctp_is_addr_restricted(stcb, sifa))) ||
2716                     (non_asoc_addr_ok &&
2717                     (sctp_is_addr_restricted(stcb, sifa)) &&
2718                     (!sctp_is_addr_pending(stcb, sifa)))) {
2719                         /* on the no-no list */
2720                         continue;
2721                 }
2722                 stcb->asoc.last_used_address = laddr;
2723                 atomic_add_int(&sifa->refcount, 1);
2724                 return (sifa);
2725         }
2726         if (start_at_beginning == 0) {
2727                 stcb->asoc.last_used_address = NULL;
2728                 goto sctp_from_the_top;
2729         }
2730         /* now try for any higher scope than the destination */
2731         stcb->asoc.last_used_address = starting_point;
2732         start_at_beginning = 0;
2733 sctp_from_the_top2:
2734         if (stcb->asoc.last_used_address == NULL) {
2735                 start_at_beginning = 1;
2736                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2737         }
2738         /* search beginning with the last used address */
2739         for (laddr = stcb->asoc.last_used_address; laddr;
2740             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2741                 if (laddr->ifa == NULL) {
2742                         /* address has been removed */
2743                         continue;
2744                 }
2745                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2746                         /* address is being deleted */
2747                         continue;
2748                 }
2749                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2750                     dest_is_priv, fam);
2751                 if (sifa == NULL)
2752                         continue;
2753                 if (((non_asoc_addr_ok == 0) &&
2754                     (sctp_is_addr_restricted(stcb, sifa))) ||
2755                     (non_asoc_addr_ok &&
2756                     (sctp_is_addr_restricted(stcb, sifa)) &&
2757                     (!sctp_is_addr_pending(stcb, sifa)))) {
2758                         /* on the no-no list */
2759                         continue;
2760                 }
2761                 stcb->asoc.last_used_address = laddr;
2762                 atomic_add_int(&sifa->refcount, 1);
2763                 return (sifa);
2764         }
2765         if (start_at_beginning == 0) {
2766                 stcb->asoc.last_used_address = NULL;
2767                 goto sctp_from_the_top2;
2768         }
2769         return (NULL);
2770 }
2771
2772 static struct sctp_ifa *
2773 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2774     struct sctp_inpcb *inp,
2775     struct sctp_tcb *stcb,
2776     int non_asoc_addr_ok,
2777     uint8_t dest_is_loop,
2778     uint8_t dest_is_priv,
2779     int addr_wanted,
2780     sa_family_t fam,
2781     sctp_route_t *ro
2782 )
2783 {
2784         struct sctp_ifa *ifa, *sifa;
2785         int num_eligible_addr = 0;
2786 #ifdef INET6
2787         struct sockaddr_in6 sin6, lsa6;
2788
2789         if (fam == AF_INET6) {
2790                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2791                 (void)sa6_recoverscope(&sin6);
2792         }
2793 #endif                          /* INET6 */
2794         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2795 #ifdef INET
2796                 if ((ifa->address.sa.sa_family == AF_INET) &&
2797                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2798                     &ifa->address.sin.sin_addr) != 0)) {
2799                         continue;
2800                 }
2801 #endif
2802 #ifdef INET6
2803                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2804                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2805                     &ifa->address.sin6.sin6_addr) != 0)) {
2806                         continue;
2807                 }
2808 #endif
2809                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2810                     (non_asoc_addr_ok == 0))
2811                         continue;
2812                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2813                     dest_is_priv, fam);
2814                 if (sifa == NULL)
2815                         continue;
2816 #ifdef INET6
2817                 if (fam == AF_INET6 &&
2818                     dest_is_loop &&
2819                     sifa->src_is_loop && sifa->src_is_priv) {
2820                         /*
2821                          * don't allow fe80::1 to be a src on loop ::1, we
2822                          * don't list it to the peer so we will get an
2823                          * abort.
2824                          */
2825                         continue;
2826                 }
2827                 if (fam == AF_INET6 &&
2828                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2829                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2830                         /*
2831                          * link-local <-> link-local must belong to the same
2832                          * scope.
2833                          */
2834                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2835                         (void)sa6_recoverscope(&lsa6);
2836                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2837                                 continue;
2838                         }
2839                 }
2840 #endif                          /* INET6 */
2841
2842                 /*
2843                  * Check if the IPv6 address matches to next-hop. In the
2844                  * mobile case, old IPv6 address may be not deleted from the
2845                  * interface. Then, the interface has previous and new
2846                  * addresses.  We should use one corresponding to the
2847                  * next-hop.  (by micchie)
2848                  */
2849 #ifdef INET6
2850                 if (stcb && fam == AF_INET6 &&
2851                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2852                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2853                             == 0) {
2854                                 continue;
2855                         }
2856                 }
2857 #endif
2858 #ifdef INET
2859                 /* Avoid topologically incorrect IPv4 address */
2860                 if (stcb && fam == AF_INET &&
2861                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2862                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2863                                 continue;
2864                         }
2865                 }
2866 #endif
2867                 if (stcb) {
2868                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2869                                 continue;
2870                         }
2871                         if (((non_asoc_addr_ok == 0) &&
2872                             (sctp_is_addr_restricted(stcb, sifa))) ||
2873                             (non_asoc_addr_ok &&
2874                             (sctp_is_addr_restricted(stcb, sifa)) &&
2875                             (!sctp_is_addr_pending(stcb, sifa)))) {
2876                                 /*
2877                                  * It is restricted for some reason..
2878                                  * probably not yet added.
2879                                  */
2880                                 continue;
2881                         }
2882                 }
2883                 if (num_eligible_addr >= addr_wanted) {
2884                         return (sifa);
2885                 }
2886                 num_eligible_addr++;
2887         }
2888         return (NULL);
2889 }
2890
2891
2892 static int
2893 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2894     struct sctp_inpcb *inp,
2895     struct sctp_tcb *stcb,
2896     int non_asoc_addr_ok,
2897     uint8_t dest_is_loop,
2898     uint8_t dest_is_priv,
2899     sa_family_t fam)
2900 {
2901         struct sctp_ifa *ifa, *sifa;
2902         int num_eligible_addr = 0;
2903
2904         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2905 #ifdef INET
2906                 if ((ifa->address.sa.sa_family == AF_INET) &&
2907                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2908                     &ifa->address.sin.sin_addr) != 0)) {
2909                         continue;
2910                 }
2911 #endif
2912 #ifdef INET6
2913                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2914                     (stcb != NULL) &&
2915                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2916                     &ifa->address.sin6.sin6_addr) != 0)) {
2917                         continue;
2918                 }
2919 #endif
2920                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2921                     (non_asoc_addr_ok == 0)) {
2922                         continue;
2923                 }
2924                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2925                     dest_is_priv, fam);
2926                 if (sifa == NULL) {
2927                         continue;
2928                 }
2929                 if (stcb) {
2930                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2931                                 continue;
2932                         }
2933                         if (((non_asoc_addr_ok == 0) &&
2934                             (sctp_is_addr_restricted(stcb, sifa))) ||
2935                             (non_asoc_addr_ok &&
2936                             (sctp_is_addr_restricted(stcb, sifa)) &&
2937                             (!sctp_is_addr_pending(stcb, sifa)))) {
2938                                 /*
2939                                  * It is restricted for some reason..
2940                                  * probably not yet added.
2941                                  */
2942                                 continue;
2943                         }
2944                 }
2945                 num_eligible_addr++;
2946         }
2947         return (num_eligible_addr);
2948 }
2949
2950 static struct sctp_ifa *
2951 sctp_choose_boundall(struct sctp_inpcb *inp,
2952     struct sctp_tcb *stcb,
2953     struct sctp_nets *net,
2954     sctp_route_t *ro,
2955     uint32_t vrf_id,
2956     uint8_t dest_is_priv,
2957     uint8_t dest_is_loop,
2958     int non_asoc_addr_ok,
2959     sa_family_t fam)
2960 {
2961         int cur_addr_num = 0, num_preferred = 0;
2962         void *ifn;
2963         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2964         struct sctp_ifa *sctp_ifa, *sifa;
2965         uint32_t ifn_index;
2966         struct sctp_vrf *vrf;
2967 #ifdef INET
2968         int retried = 0;
2969 #endif
2970
2971         /*-
2972          * For boundall we can use any address in the association.
2973          * If non_asoc_addr_ok is set we can use any address (at least in
2974          * theory). So we look for preferred addresses first. If we find one,
2975          * we use it. Otherwise we next try to get an address on the
2976          * interface, which we should be able to do (unless non_asoc_addr_ok
2977          * is false and we are routed out that way). In these cases where we
2978          * can't use the address of the interface we go through all the
2979          * ifn's looking for an address we can use and fill that in. Punting
2980          * means we send back address 0, which will probably cause problems
2981          * actually since then IP will fill in the address of the route ifn,
2982          * which means we probably already rejected it.. i.e. here comes an
2983          * abort :-<.
2984          */
2985         vrf = sctp_find_vrf(vrf_id);
2986         if (vrf == NULL)
2987                 return (NULL);
2988
2989         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2990         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2991         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2992         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2993         if (sctp_ifn == NULL) {
2994                 /* ?? We don't have this guy ?? */
2995                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2996                 goto bound_all_plan_b;
2997         }
2998         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2999             ifn_index, sctp_ifn->ifn_name);
3000
3001         if (net) {
3002                 cur_addr_num = net->indx_of_eligible_next_to_use;
3003         }
3004         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3005             inp, stcb,
3006             non_asoc_addr_ok,
3007             dest_is_loop,
3008             dest_is_priv, fam);
3009         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3010             num_preferred, sctp_ifn->ifn_name);
3011         if (num_preferred == 0) {
3012                 /*
3013                  * no eligible addresses, we must use some other interface
3014                  * address if we can find one.
3015                  */
3016                 goto bound_all_plan_b;
3017         }
3018         /*
3019          * Ok we have num_eligible_addr set with how many we can use, this
3020          * may vary from call to call due to addresses being deprecated
3021          * etc..
3022          */
3023         if (cur_addr_num >= num_preferred) {
3024                 cur_addr_num = 0;
3025         }
3026         /*
3027          * select the nth address from the list (where cur_addr_num is the
3028          * nth) and 0 is the first one, 1 is the second one etc...
3029          */
3030         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3031
3032         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3033             dest_is_priv, cur_addr_num, fam, ro);
3034
3035         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3036         if (sctp_ifa) {
3037                 atomic_add_int(&sctp_ifa->refcount, 1);
3038                 if (net) {
3039                         /* save off where the next one we will want */
3040                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3041                 }
3042                 return (sctp_ifa);
3043         }
3044         /*
3045          * plan_b: Look at all interfaces and find a preferred address. If
3046          * no preferred fall through to plan_c.
3047          */
3048 bound_all_plan_b:
3049         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3050         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3051                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3052                     sctp_ifn->ifn_name);
3053                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054                         /* wrong base scope */
3055                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3056                         continue;
3057                 }
3058                 if ((sctp_ifn == looked_at) && looked_at) {
3059                         /* already looked at this guy */
3060                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3061                         continue;
3062                 }
3063                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3064                     dest_is_loop, dest_is_priv, fam);
3065                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3066                     "Found ifn:%p %d preferred source addresses\n",
3067                     ifn, num_preferred);
3068                 if (num_preferred == 0) {
3069                         /* None on this interface. */
3070                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3071                         continue;
3072                 }
3073                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3074                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3075                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3076
3077                 /*
3078                  * Ok we have num_eligible_addr set with how many we can
3079                  * use, this may vary from call to call due to addresses
3080                  * being deprecated etc..
3081                  */
3082                 if (cur_addr_num >= num_preferred) {
3083                         cur_addr_num = 0;
3084                 }
3085                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3086                     dest_is_priv, cur_addr_num, fam, ro);
3087                 if (sifa == NULL)
3088                         continue;
3089                 if (net) {
3090                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3091                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3092                             cur_addr_num);
3093                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3094                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3096                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3097                 }
3098                 atomic_add_int(&sifa->refcount, 1);
3099                 return (sifa);
3100         }
3101 #ifdef INET
3102 again_with_private_addresses_allowed:
3103 #endif
3104         /* plan_c: do we have an acceptable address on the emit interface */
3105         sifa = NULL;
3106         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3107         if (emit_ifn == NULL) {
3108                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3109                 goto plan_d;
3110         }
3111         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3113 #ifdef INET
3114                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3115                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3116                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3117                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3118                         continue;
3119                 }
3120 #endif
3121 #ifdef INET6
3122                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3123                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3124                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3125                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3126                         continue;
3127                 }
3128 #endif
3129                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3130                     (non_asoc_addr_ok == 0)) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3132                         continue;
3133                 }
3134                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3135                     dest_is_priv, fam);
3136                 if (sifa == NULL) {
3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3138                         continue;
3139                 }
3140                 if (stcb) {
3141                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3142                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3143                                 sifa = NULL;
3144                                 continue;
3145                         }
3146                         if (((non_asoc_addr_ok == 0) &&
3147                             (sctp_is_addr_restricted(stcb, sifa))) ||
3148                             (non_asoc_addr_ok &&
3149                             (sctp_is_addr_restricted(stcb, sifa)) &&
3150                             (!sctp_is_addr_pending(stcb, sifa)))) {
3151                                 /*
3152                                  * It is restricted for some reason..
3153                                  * probably not yet added.
3154                                  */
3155                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3156                                 sifa = NULL;
3157                                 continue;
3158                         }
3159                 }
3160                 atomic_add_int(&sifa->refcount, 1);
3161                 goto out;
3162         }
3163 plan_d:
3164         /*
3165          * plan_d: We are in trouble. No preferred address on the emit
3166          * interface. And not even a preferred address on all interfaces. Go
3167          * out and see if we can find an acceptable address somewhere
3168          * amongst all interfaces.
3169          */
3170         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3171         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3172                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3173                         /* wrong base scope */
3174                         continue;
3175                 }
3176                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3177 #ifdef INET
3178                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3179                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3180                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3181                                 continue;
3182                         }
3183 #endif
3184 #ifdef INET6
3185                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3186                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3187                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3188                                 continue;
3189                         }
3190 #endif
3191                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3192                             (non_asoc_addr_ok == 0))
3193                                 continue;
3194                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3195                             dest_is_loop,
3196                             dest_is_priv, fam);
3197                         if (sifa == NULL)
3198                                 continue;
3199                         if (stcb) {
3200                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3201                                         sifa = NULL;
3202                                         continue;
3203                                 }
3204                                 if (((non_asoc_addr_ok == 0) &&
3205                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3206                                     (non_asoc_addr_ok &&
3207                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3208                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3209                                         /*
3210                                          * It is restricted for some
3211                                          * reason.. probably not yet added.
3212                                          */
3213                                         sifa = NULL;
3214                                         continue;
3215                                 }
3216                         }
3217                         goto out;
3218                 }
3219         }
3220 #ifdef INET
3221         if (stcb) {
3222                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3223                         stcb->asoc.scope.ipv4_local_scope = 1;
3224                         retried = 1;
3225                         goto again_with_private_addresses_allowed;
3226                 } else if (retried == 1) {
3227                         stcb->asoc.scope.ipv4_local_scope = 0;
3228                 }
3229         }
3230 #endif
3231 out:
3232 #ifdef INET
3233         if (sifa) {
3234                 if (retried == 1) {
3235                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3236                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3237                                         /* wrong base scope */
3238                                         continue;
3239                                 }
3240                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3241                                         struct sctp_ifa *tmp_sifa;
3242
3243 #ifdef INET
3244                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3245                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3246                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3247                                                 continue;
3248                                         }
3249 #endif
3250 #ifdef INET6
3251                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3252                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3253                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3254                                                 continue;
3255                                         }
3256 #endif
3257                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3258                                             (non_asoc_addr_ok == 0))
3259                                                 continue;
3260                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3261                                             dest_is_loop,
3262                                             dest_is_priv, fam);
3263                                         if (tmp_sifa == NULL) {
3264                                                 continue;
3265                                         }
3266                                         if (tmp_sifa == sifa) {
3267                                                 continue;
3268                                         }
3269                                         if (stcb) {
3270                                                 if (sctp_is_address_in_scope(tmp_sifa,
3271                                                     &stcb->asoc.scope, 0) == 0) {
3272                                                         continue;
3273                                                 }
3274                                                 if (((non_asoc_addr_ok == 0) &&
3275                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3276                                                     (non_asoc_addr_ok &&
3277                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3278                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3279                                                         /*
3280                                                          * It is restricted
3281                                                          * for some reason..
3282                                                          * probably not yet
3283                                                          * added.
3284                                                          */
3285                                                         continue;
3286                                                 }
3287                                         }
3288                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3289                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3290                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3291                                         }
3292                                 }
3293                         }
3294                 }
3295                 atomic_add_int(&sifa->refcount, 1);
3296         }
3297 #endif
3298         return (sifa);
3299 }
3300
3301
3302
3303 /* tcb may be NULL */
3304 struct sctp_ifa *
3305 sctp_source_address_selection(struct sctp_inpcb *inp,
3306     struct sctp_tcb *stcb,
3307     sctp_route_t *ro,
3308     struct sctp_nets *net,
3309     int non_asoc_addr_ok, uint32_t vrf_id)
3310 {
3311         struct sctp_ifa *answer;
3312         uint8_t dest_is_priv, dest_is_loop;
3313         sa_family_t fam;
3314 #ifdef INET
3315         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3316 #endif
3317 #ifdef INET6
3318         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3319 #endif
3320
3321         /**
3322          * Rules:
3323          * - Find the route if needed, cache if I can.
3324          * - Look at interface address in route, Is it in the bound list. If so we
3325          *   have the best source.
3326          * - If not we must rotate amongst the addresses.
3327          *
3328          * Cavets and issues
3329          *
3330          * Do we need to pay attention to scope. We can have a private address
3331          * or a global address we are sourcing or sending to. So if we draw
3332          * it out
3333          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3334          * For V4
3335          * ------------------------------------------
3336          *      source     *      dest  *  result
3337          * -----------------------------------------
3338          * <a>  Private    *    Global  *  NAT
3339          * -----------------------------------------
3340          * <b>  Private    *    Private *  No problem
3341          * -----------------------------------------
3342          * <c>  Global     *    Private *  Huh, How will this work?
3343          * -----------------------------------------
3344          * <d>  Global     *    Global  *  No Problem
3345          *------------------------------------------
3346          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3347          * For V6
3348          *------------------------------------------
3349          *      source     *      dest  *  result
3350          * -----------------------------------------
3351          * <a>  Linklocal  *    Global  *
3352          * -----------------------------------------
3353          * <b>  Linklocal  * Linklocal  *  No problem
3354          * -----------------------------------------
3355          * <c>  Global     * Linklocal  *  Huh, How will this work?
3356          * -----------------------------------------
3357          * <d>  Global     *    Global  *  No Problem
3358          *------------------------------------------
3359          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3360          *
3361          * And then we add to that what happens if there are multiple addresses
3362          * assigned to an interface. Remember the ifa on a ifn is a linked
3363          * list of addresses. So one interface can have more than one IP
3364          * address. What happens if we have both a private and a global
3365          * address? Do we then use context of destination to sort out which
3366          * one is best? And what about NAT's sending P->G may get you a NAT
3367          * translation, or should you select the G thats on the interface in
3368          * preference.
3369          *
3370          * Decisions:
3371          *
3372          * - count the number of addresses on the interface.
3373          * - if it is one, no problem except case <c>.
3374          *   For <a> we will assume a NAT out there.
3375          * - if there are more than one, then we need to worry about scope P
3376          *   or G. We should prefer G -> G and P -> P if possible.
3377          *   Then as a secondary fall back to mixed types G->P being a last
3378          *   ditch one.
3379          * - The above all works for bound all, but bound specific we need to
3380          *   use the same concept but instead only consider the bound
3381          *   addresses. If the bound set is NOT assigned to the interface then
3382          *   we must use rotation amongst the bound addresses..
3383          */
3384         if (ro->ro_rt == NULL) {
3385                 /*
3386                  * Need a route to cache.
3387                  */
3388                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3389         }
3390         if (ro->ro_rt == NULL) {
3391                 return (NULL);
3392         }
3393         fam = ro->ro_dst.sa_family;
3394         dest_is_priv = dest_is_loop = 0;
3395         /* Setup our scopes for the destination */
3396         switch (fam) {
3397 #ifdef INET
3398         case AF_INET:
3399                 /* Scope based on outbound address */
3400                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3401                         dest_is_loop = 1;
3402                         if (net != NULL) {
3403                                 /* mark it as local */
3404                                 net->addr_is_local = 1;
3405                         }
3406                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3407                         dest_is_priv = 1;
3408                 }
3409                 break;
3410 #endif
3411 #ifdef INET6
3412         case AF_INET6:
3413                 /* Scope based on outbound address */
3414                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3415                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3416                         /*
3417                          * If the address is a loopback address, which
3418                          * consists of "::1" OR "fe80::1%lo0", we are
3419                          * loopback scope. But we don't use dest_is_priv
3420                          * (link local addresses).
3421                          */
3422                         dest_is_loop = 1;
3423                         if (net != NULL) {
3424                                 /* mark it as local */
3425                                 net->addr_is_local = 1;
3426                         }
3427                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3428                         dest_is_priv = 1;
3429                 }
3430                 break;
3431 #endif
3432         }
3433         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3434         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3435         SCTP_IPI_ADDR_RLOCK();
3436         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3437                 /*
3438                  * Bound all case
3439                  */
3440                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3441                     dest_is_priv, dest_is_loop,
3442                     non_asoc_addr_ok, fam);
3443                 SCTP_IPI_ADDR_RUNLOCK();
3444                 return (answer);
3445         }
3446         /*
3447          * Subset bound case
3448          */
3449         if (stcb) {
3450                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3451                     vrf_id, dest_is_priv,
3452                     dest_is_loop,
3453                     non_asoc_addr_ok, fam);
3454         } else {
3455                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3456                     non_asoc_addr_ok,
3457                     dest_is_priv,
3458                     dest_is_loop, fam);
3459         }
3460         SCTP_IPI_ADDR_RUNLOCK();
3461         return (answer);
3462 }
3463
3464 static int
3465 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3466 {
3467         struct cmsghdr cmh;
3468         int tlen, at, found;
3469         struct sctp_sndinfo sndinfo;
3470         struct sctp_prinfo prinfo;
3471         struct sctp_authinfo authinfo;
3472
3473         tlen = SCTP_BUF_LEN(control);
3474         at = 0;
3475         found = 0;
3476         /*
3477          * Independent of how many mbufs, find the c_type inside the control
3478          * structure and copy out the data.
3479          */
3480         while (at < tlen) {
3481                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3482                         /* There is not enough room for one more. */
3483                         return (found);
3484                 }
3485                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3486                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3487                         /* We dont't have a complete CMSG header. */
3488                         return (found);
3489                 }
3490                 if (((int)cmh.cmsg_len + at) > tlen) {
3491                         /* We don't have the complete CMSG. */
3492                         return (found);
3493                 }
3494                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3495                     ((c_type == cmh.cmsg_type) ||
3496                     ((c_type == SCTP_SNDRCV) &&
3497                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3498                     (cmh.cmsg_type == SCTP_PRINFO) ||
3499                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3500                         if (c_type == cmh.cmsg_type) {
3501                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3502                                         return (found);
3503                                 }
3504                                 /* It is exactly what we want. Copy it out. */
3505                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3506                                 return (1);
3507                         } else {
3508                                 struct sctp_sndrcvinfo *sndrcvinfo;
3509
3510                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3511                                 if (found == 0) {
3512                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3513                                                 return (found);
3514                                         }
3515                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3516                                 }
3517                                 switch (cmh.cmsg_type) {
3518                                 case SCTP_SNDINFO:
3519                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3520                                                 return (found);
3521                                         }
3522                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3523                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3524                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3525                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3526                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3527                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3528                                         break;
3529                                 case SCTP_PRINFO:
3530                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3531                                                 return (found);
3532                                         }
3533                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3534                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3535                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3536                                         } else {
3537                                                 sndrcvinfo->sinfo_timetolive = 0;
3538                                         }
3539                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3540                                         break;
3541                                 case SCTP_AUTHINFO:
3542                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3543                                                 return (found);
3544                                         }
3545                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3546                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3547                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3548                                         break;
3549                                 default:
3550                                         return (found);
3551                                 }
3552                                 found = 1;
3553                         }
3554                 }
3555                 at += CMSG_ALIGN(cmh.cmsg_len);
3556         }
3557         return (found);
3558 }
3559
3560 static int
3561 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3562 {
3563         struct cmsghdr cmh;
3564         int tlen, at;
3565         struct sctp_initmsg initmsg;
3566 #ifdef INET
3567         struct sockaddr_in sin;
3568 #endif
3569 #ifdef INET6
3570         struct sockaddr_in6 sin6;
3571 #endif
3572
3573         tlen = SCTP_BUF_LEN(control);
3574         at = 0;
3575         while (at < tlen) {
3576                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3577                         /* There is not enough room for one more. */
3578                         *error = EINVAL;
3579                         return (1);
3580                 }
3581                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3582                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3583                         /* We dont't have a complete CMSG header. */
3584                         *error = EINVAL;
3585                         return (1);
3586                 }
3587                 if (((int)cmh.cmsg_len + at) > tlen) {
3588                         /* We don't have the complete CMSG. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3593                         switch (cmh.cmsg_type) {
3594                         case SCTP_INIT:
3595                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3596                                         *error = EINVAL;
3597                                         return (1);
3598                                 }
3599                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3600                                 if (initmsg.sinit_max_attempts)
3601                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3602                                 if (initmsg.sinit_num_ostreams)
3603                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3604                                 if (initmsg.sinit_max_instreams)
3605                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3606                                 if (initmsg.sinit_max_init_timeo)
3607                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3608                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3609                                         struct sctp_stream_out *tmp_str;
3610                                         unsigned int i;
3611 #if defined(SCTP_DETAILED_STR_STATS)
3612                                         int j;
3613 #endif
3614
3615                                         /* Default is NOT correct */
3616                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3617                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3618                                         SCTP_TCB_UNLOCK(stcb);
3619                                         SCTP_MALLOC(tmp_str,
3620                                             struct sctp_stream_out *,
3621                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3622                                             SCTP_M_STRMO);
3623                                         SCTP_TCB_LOCK(stcb);
3624                                         if (tmp_str != NULL) {
3625                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3626                                                 stcb->asoc.strmout = tmp_str;
3627                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3628                                         } else {
3629                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3630                                         }
3631                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3632                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3633                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3634                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3635                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3636 #if defined(SCTP_DETAILED_STR_STATS)
3637                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3638                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3639                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3640                                                 }
3641 #else
3642                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3643                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3644 #endif
3645                                                 stcb->asoc.strmout[i].sid = i;
3646                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3649                                         }
3650                                 }
3651                                 break;
3652 #ifdef INET
3653                         case SCTP_DSTADDRV4:
3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3655                                         *error = EINVAL;
3656                                         return (1);
3657                                 }
3658                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3659                                 sin.sin_family = AF_INET;
3660                                 sin.sin_len = sizeof(struct sockaddr_in);
3661                                 sin.sin_port = stcb->rport;
3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3663                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3664                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3665                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3670                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3671                                         *error = ENOBUFS;
3672                                         return (1);
3673                                 }
3674                                 break;
3675 #endif
3676 #ifdef INET6
3677                         case SCTP_DSTADDRV6:
3678                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3679                                         *error = EINVAL;
3680                                         return (1);
3681                                 }
3682                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3683                                 sin6.sin6_family = AF_INET6;
3684                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3685                                 sin6.sin6_port = stcb->rport;
3686                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3687                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3688                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3689                                         *error = EINVAL;
3690                                         return (1);
3691                                 }
3692 #ifdef INET
3693                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3694                                         in6_sin6_2_sin(&sin, &sin6);
3695                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3696                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3697                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3698                                                 *error = EINVAL;
3699                                                 return (1);
3700                                         }
3701                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3702                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703                                                 *error = ENOBUFS;
3704                                                 return (1);
3705                                         }
3706                                 } else
3707 #endif
3708                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3709                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710                                         *error = ENOBUFS;
3711                                         return (1);
3712                                 }
3713                                 break;
3714 #endif
3715                         default:
3716                                 break;
3717                         }
3718                 }
3719                 at += CMSG_ALIGN(cmh.cmsg_len);
3720         }
3721         return (0);
3722 }
3723
3724 static struct sctp_tcb *
3725 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3726     uint16_t port,
3727     struct mbuf *control,
3728     struct sctp_nets **net_p,
3729     int *error)
3730 {
3731         struct cmsghdr cmh;
3732         int tlen, at;
3733         struct sctp_tcb *stcb;
3734         struct sockaddr *addr;
3735 #ifdef INET
3736         struct sockaddr_in sin;
3737 #endif
3738 #ifdef INET6
3739         struct sockaddr_in6 sin6;
3740 #endif
3741
3742         tlen = SCTP_BUF_LEN(control);
3743         at = 0;
3744         while (at < tlen) {
3745                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3746                         /* There is not enough room for one more. */
3747                         *error = EINVAL;
3748                         return (NULL);
3749                 }
3750                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3751                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3752                         /* We dont't have a complete CMSG header. */
3753                         *error = EINVAL;
3754                         return (NULL);
3755                 }
3756                 if (((int)cmh.cmsg_len + at) > tlen) {
3757                         /* We don't have the complete CMSG. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3762                         switch (cmh.cmsg_type) {
3763 #ifdef INET
3764                         case SCTP_DSTADDRV4:
3765                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3766                                         *error = EINVAL;
3767                                         return (NULL);
3768                                 }
3769                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3770                                 sin.sin_family = AF_INET;
3771                                 sin.sin_len = sizeof(struct sockaddr_in);
3772                                 sin.sin_port = port;
3773                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3774                                 addr = (struct sockaddr *)&sin;
3775                                 break;
3776 #endif
3777 #ifdef INET6
3778                         case SCTP_DSTADDRV6:
3779                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3780                                         *error = EINVAL;
3781                                         return (NULL);
3782                                 }
3783                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3784                                 sin6.sin6_family = AF_INET6;
3785                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3786                                 sin6.sin6_port = port;
3787                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3788 #ifdef INET
3789                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3790                                         in6_sin6_2_sin(&sin, &sin6);
3791                                         addr = (struct sockaddr *)&sin;
3792                                 } else
3793 #endif
3794                                         addr = (struct sockaddr *)&sin6;
3795                                 break;
3796 #endif
3797                         default:
3798                                 addr = NULL;
3799                                 break;
3800                         }
3801                         if (addr) {
3802                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3803                                 if (stcb != NULL) {
3804                                         return (stcb);
3805                                 }
3806                         }
3807                 }
3808                 at += CMSG_ALIGN(cmh.cmsg_len);
3809         }
3810         return (NULL);
3811 }
3812
3813 static struct mbuf *
3814 sctp_add_cookie(struct mbuf *init, int init_offset,
3815     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3816 {
3817         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3818         struct sctp_state_cookie *stc;
3819         struct sctp_paramhdr *ph;
3820         uint8_t *foo;
3821         int sig_offset;
3822         uint16_t cookie_sz;
3823
3824         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3825             sizeof(struct sctp_paramhdr)), 0,
3826             M_NOWAIT, 1, MT_DATA);
3827         if (mret == NULL) {
3828                 return (NULL);
3829         }
3830         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3831         if (copy_init == NULL) {
3832                 sctp_m_freem(mret);
3833                 return (NULL);
3834         }
3835 #ifdef SCTP_MBUF_LOGGING
3836         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3837                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3838         }
3839 #endif
3840         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3841             M_NOWAIT);
3842         if (copy_initack == NULL) {
3843                 sctp_m_freem(mret);
3844                 sctp_m_freem(copy_init);
3845                 return (NULL);
3846         }
3847 #ifdef SCTP_MBUF_LOGGING
3848         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3850         }
3851 #endif
3852         /* easy side we just drop it on the end */
3853         ph = mtod(mret, struct sctp_paramhdr *);
3854         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3855             sizeof(struct sctp_paramhdr);
3856         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3857             sizeof(struct sctp_paramhdr));
3858         ph->param_type = htons(SCTP_STATE_COOKIE);
3859         ph->param_length = 0;   /* fill in at the end */
3860         /* Fill in the stc cookie data */
3861         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3862
3863         /* tack the INIT and then the INIT-ACK onto the chain */
3864         cookie_sz = 0;
3865         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3866                 cookie_sz += SCTP_BUF_LEN(m_at);
3867                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3868                         SCTP_BUF_NEXT(m_at) = copy_init;
3869                         break;
3870                 }
3871         }
3872         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3873                 cookie_sz += SCTP_BUF_LEN(m_at);
3874                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3875                         SCTP_BUF_NEXT(m_at) = copy_initack;
3876                         break;
3877                 }
3878         }
3879         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880                 cookie_sz += SCTP_BUF_LEN(m_at);
3881                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3882                         break;
3883                 }
3884         }
3885         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3886         if (sig == NULL) {
3887                 /* no space, so free the entire chain */
3888                 sctp_m_freem(mret);
3889                 return (NULL);
3890         }
3891         SCTP_BUF_LEN(sig) = 0;
3892         SCTP_BUF_NEXT(m_at) = sig;
3893         sig_offset = 0;
3894         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3895         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3896         *signature = foo;
3897         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3898         cookie_sz += SCTP_SIGNATURE_SIZE;
3899         ph->param_length = htons(cookie_sz);
3900         return (mret);
3901 }
3902
3903
3904 static uint8_t
3905 sctp_get_ect(struct sctp_tcb *stcb)
3906 {
3907         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3908                 return (SCTP_ECT0_BIT);
3909         } else {
3910                 return (0);
3911         }
3912 }
3913
3914 #if defined(INET) || defined(INET6)
3915 static void
3916 sctp_handle_no_route(struct sctp_tcb *stcb,
3917     struct sctp_nets *net,
3918     int so_locked)
3919 {
3920         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3921
3922         if (net) {
3923                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3924                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3925                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3926                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3927                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3928                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3929                                     stcb, 0,
3930                                     (void *)net,
3931                                     so_locked);
3932                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3933                                 net->dest_state &= ~SCTP_ADDR_PF;
3934                         }
3935                 }
3936                 if (stcb) {
3937                         if (net == stcb->asoc.primary_destination) {
3938                                 /* need a new primary */
3939                                 struct sctp_nets *alt;
3940
3941                                 alt = sctp_find_alternate_net(stcb, net, 0);
3942                                 if (alt != net) {
3943                                         if (stcb->asoc.alternate) {
3944                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3945                                         }
3946                                         stcb->asoc.alternate = alt;
3947                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3948                                         if (net->ro._s_addr) {
3949                                                 sctp_free_ifa(net->ro._s_addr);
3950                                                 net->ro._s_addr = NULL;
3951                                         }
3952                                         net->src_addr_selected = 0;
3953                                 }
3954                         }
3955                 }
3956         }
3957 }
3958 #endif
3959
3960 static int
3961 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3962     struct sctp_tcb *stcb,      /* may be NULL */
3963     struct sctp_nets *net,
3964     struct sockaddr *to,
3965     struct mbuf *m,
3966     uint32_t auth_offset,
3967     struct sctp_auth_chunk *auth,
3968     uint16_t auth_keyid,
3969     int nofragment_flag,
3970     int ecn_ok,
3971     int out_of_asoc_ok,
3972     uint16_t src_port,
3973     uint16_t dest_port,
3974     uint32_t v_tag,
3975     uint16_t port,
3976     union sctp_sockstore *over_addr,
3977     uint8_t mflowtype, uint32_t mflowid,
3978 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3979     int so_locked SCTP_UNUSED
3980 #else
3981     int so_locked
3982 #endif
3983 )
3984 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3985 {
3986         /**
3987          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3988          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3989          * - fill in the HMAC digest of any AUTH chunk in the packet.
3990          * - calculate and fill in the SCTP checksum.
3991          * - prepend an IP address header.
3992          * - if boundall use INADDR_ANY.
3993          * - if boundspecific do source address selection.
3994          * - set fragmentation option for ipV4.
3995          * - On return from IP output, check/adjust mtu size of output
3996          *   interface and smallest_mtu size as well.
3997          */
3998         /* Will need ifdefs around this */
3999         struct mbuf *newm;
4000         struct sctphdr *sctphdr;
4001         int packet_length;
4002         int ret;
4003 #if defined(INET) || defined(INET6)
4004         uint32_t vrf_id;
4005 #endif
4006 #if defined(INET) || defined(INET6)
4007         struct mbuf *o_pak;
4008         sctp_route_t *ro = NULL;
4009         struct udphdr *udp = NULL;
4010 #endif
4011         uint8_t tos_value;
4012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4013         struct socket *so = NULL;
4014 #endif
4015
4016         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4017                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4018                 sctp_m_freem(m);
4019                 return (EFAULT);
4020         }
4021 #if defined(INET) || defined(INET6)
4022         if (stcb) {
4023                 vrf_id = stcb->asoc.vrf_id;
4024         } else {
4025                 vrf_id = inp->def_vrf_id;
4026         }
4027 #endif
4028         /* fill in the HMAC digest for any AUTH chunk in the packet */
4029         if ((auth != NULL) && (stcb != NULL)) {
4030                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4031         }
4032         if (net) {
4033                 tos_value = net->dscp;
4034         } else if (stcb) {
4035                 tos_value = stcb->asoc.default_dscp;
4036         } else {
4037                 tos_value = inp->sctp_ep.default_dscp;
4038         }
4039
4040         switch (to->sa_family) {
4041 #ifdef INET
4042         case AF_INET:
4043                 {
4044                         struct ip *ip = NULL;
4045                         sctp_route_t iproute;
4046                         int len;
4047
4048                         len = SCTP_MIN_V4_OVERHEAD;
4049                         if (port) {
4050                                 len += sizeof(struct udphdr);
4051                         }
4052                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4053                         if (newm == NULL) {
4054                                 sctp_m_freem(m);
4055                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4056                                 return (ENOMEM);
4057                         }
4058                         SCTP_ALIGN_TO_END(newm, len);
4059                         SCTP_BUF_LEN(newm) = len;
4060                         SCTP_BUF_NEXT(newm) = m;
4061                         m = newm;
4062                         if (net != NULL) {
4063                                 m->m_pkthdr.flowid = net->flowid;
4064                                 M_HASHTYPE_SET(m, net->flowtype);
4065                         } else {
4066                                 m->m_pkthdr.flowid = mflowid;
4067                                 M_HASHTYPE_SET(m, mflowtype);
4068                         }
4069                         packet_length = sctp_calculate_len(m);
4070                         ip = mtod(m, struct ip *);
4071                         ip->ip_v = IPVERSION;
4072                         ip->ip_hl = (sizeof(struct ip) >> 2);
4073                         if (tos_value == 0) {
4074                                 /*
4075                                  * This means especially, that it is not set
4076                                  * at the SCTP layer. So use the value from
4077                                  * the IP layer.
4078                                  */
4079                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4080                         }
4081                         tos_value &= 0xfc;
4082                         if (ecn_ok) {
4083                                 tos_value |= sctp_get_ect(stcb);
4084                         }
4085                         if ((nofragment_flag) && (port == 0)) {
4086                                 ip->ip_off = htons(IP_DF);
4087                         } else {
4088                                 ip->ip_off = htons(0);
4089                         }
4090                         /* FreeBSD has a function for ip_id's */
4091                         ip_fillid(ip);
4092
4093                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4094                         ip->ip_len = htons(packet_length);
4095                         ip->ip_tos = tos_value;
4096                         if (port) {
4097                                 ip->ip_p = IPPROTO_UDP;
4098                         } else {
4099                                 ip->ip_p = IPPROTO_SCTP;
4100                         }
4101                         ip->ip_sum = 0;
4102                         if (net == NULL) {
4103                                 ro = &iproute;
4104                                 memset(&iproute, 0, sizeof(iproute));
4105                                 memcpy(&ro->ro_dst, to, to->sa_len);
4106                         } else {
4107                                 ro = (sctp_route_t *)&net->ro;
4108                         }
4109                         /* Now the address selection part */
4110                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4111
4112                         /* call the routine to select the src address */
4113                         if (net && out_of_asoc_ok == 0) {
4114                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4115                                         sctp_free_ifa(net->ro._s_addr);
4116                                         net->ro._s_addr = NULL;
4117                                         net->src_addr_selected = 0;
4118                                         if (ro->ro_rt) {
4119                                                 RTFREE(ro->ro_rt);
4120                                                 ro->ro_rt = NULL;
4121                                         }
4122                                 }
4123                                 if (net->src_addr_selected == 0) {
4124                                         /* Cache the source address */
4125                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4126                                             ro, net, 0,
4127                                             vrf_id);
4128                                         net->src_addr_selected = 1;
4129                                 }
4130                                 if (net->ro._s_addr == NULL) {
4131                                         /* No route to host */
4132                                         net->src_addr_selected = 0;
4133                                         sctp_handle_no_route(stcb, net, so_locked);
4134                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135                                         sctp_m_freem(m);
4136                                         return (EHOSTUNREACH);
4137                                 }
4138                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4139                         } else {
4140                                 if (over_addr == NULL) {
4141                                         struct sctp_ifa *_lsrc;
4142
4143                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4144                                             net,
4145                                             out_of_asoc_ok,
4146                                             vrf_id);
4147                                         if (_lsrc == NULL) {
4148                                                 sctp_handle_no_route(stcb, net, so_locked);
4149                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4150                                                 sctp_m_freem(m);
4151                                                 return (EHOSTUNREACH);
4152                                         }
4153                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4154                                         sctp_free_ifa(_lsrc);
4155                                 } else {
4156                                         ip->ip_src = over_addr->sin.sin_addr;
4157                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4158                                 }
4159                         }
4160                         if (port) {
4161                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4162                                         sctp_handle_no_route(stcb, net, so_locked);
4163                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4164                                         sctp_m_freem(m);
4165                                         return (EHOSTUNREACH);
4166                                 }
4167                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4168                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4169                                 udp->uh_dport = port;
4170                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4171                                 if (V_udp_cksum) {
4172                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4173                                 } else {
4174                                         udp->uh_sum = 0;
4175                                 }
4176                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4177                         } else {
4178                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4179                         }
4180
4181                         sctphdr->src_port = src_port;
4182                         sctphdr->dest_port = dest_port;
4183                         sctphdr->v_tag = v_tag;
4184                         sctphdr->checksum = 0;
4185
4186                         /*
4187                          * If source address selection fails and we find no
4188                          * route then the ip_output should fail as well with
4189                          * a NO_ROUTE_TO_HOST type error. We probably should
4190                          * catch that somewhere and abort the association
4191                          * right away (assuming this is an INIT being sent).
4192                          */
4193                         if (ro->ro_rt == NULL) {
4194                                 /*
4195                                  * src addr selection failed to find a route
4196                                  * (or valid source addr), so we can't get
4197                                  * there from here (yet)!
4198                                  */
4199                                 sctp_handle_no_route(stcb, net, so_locked);
4200                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201                                 sctp_m_freem(m);
4202                                 return (EHOSTUNREACH);
4203                         }
4204                         if (ro != &iproute) {
4205                                 memcpy(&iproute, ro, sizeof(*ro));
4206                         }
4207                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4208                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4209                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4210                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4211                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4212                             (void *)ro->ro_rt);
4213
4214                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4215                                 /* failed to prepend data, give up */
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4217                                 sctp_m_freem(m);
4218                                 return (ENOMEM);
4219                         }
4220                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4221                         if (port) {
4222 #if defined(SCTP_WITH_NO_CSUM)
4223                                 SCTP_STAT_INCR(sctps_sendnocrc);
4224 #else
4225                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4226                                 SCTP_STAT_INCR(sctps_sendswcrc);
4227 #endif
4228                                 if (V_udp_cksum) {
4229                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4230                                 }
4231                         } else {
4232 #if defined(SCTP_WITH_NO_CSUM)
4233                                 SCTP_STAT_INCR(sctps_sendnocrc);
4234 #else
4235                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4236                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4237                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4238 #endif
4239                         }
4240 #ifdef SCTP_PACKET_LOGGING
4241                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4242                                 sctp_packet_log(o_pak);
4243 #endif
4244                         /* send it out.  table id is taken from stcb */
4245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4246                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4247                                 so = SCTP_INP_SO(inp);
4248                                 SCTP_SOCKET_UNLOCK(so, 0);
4249                         }
4250 #endif
4251                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4253                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4254                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4255                                 SCTP_TCB_UNLOCK(stcb);
4256                                 SCTP_SOCKET_LOCK(so, 0);
4257                                 SCTP_TCB_LOCK(stcb);
4258                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4259                         }
4260 #endif
4261                         SCTP_STAT_INCR(sctps_sendpackets);
4262                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4263                         if (ret)
4264                                 SCTP_STAT_INCR(sctps_senderrors);
4265
4266                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4267                         if (net == NULL) {
4268                                 /* free tempy routes */
4269                                 RO_RTFREE(ro);
4270                         } else {
4271                                 /*
4272                                  * PMTU check versus smallest asoc MTU goes
4273                                  * here
4274                                  */
4275                                 if ((ro->ro_rt != NULL) &&
4276                                     (net->ro._s_addr)) {
4277                                         uint32_t mtu;
4278
4279                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4280                                         if (mtu > 0) {
4281                                                 if (net->port) {
4282                                                         mtu -= sizeof(struct udphdr);
4283                                                 }
4284                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4285                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4286                                                 }
4287                                                 net->mtu = mtu;
4288                                         }
4289                                 } else if (ro->ro_rt == NULL) {
4290                                         /* route was freed */
4291                                         if (net->ro._s_addr &&
4292                                             net->src_addr_selected) {
4293                                                 sctp_free_ifa(net->ro._s_addr);
4294                                                 net->ro._s_addr = NULL;
4295                                         }
4296                                         net->src_addr_selected = 0;
4297                                 }
4298                         }
4299                         return (ret);
4300                 }
4301 #endif
4302 #ifdef INET6
4303         case AF_INET6:
4304                 {
4305                         uint32_t flowlabel, flowinfo;
4306                         struct ip6_hdr *ip6h;
4307                         struct route_in6 ip6route;
4308                         struct ifnet *ifp;
4309                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4310                         int prev_scope = 0;
4311                         struct sockaddr_in6 lsa6_storage;
4312                         int error;
4313                         u_short prev_port = 0;
4314                         int len;
4315
4316                         if (net) {
4317                                 flowlabel = net->flowlabel;
4318                         } else if (stcb) {
4319                                 flowlabel = stcb->asoc.default_flowlabel;
4320                         } else {
4321                                 flowlabel = inp->sctp_ep.default_flowlabel;
4322                         }
4323                         if (flowlabel == 0) {
4324                                 /*
4325                                  * This means especially, that it is not set
4326                                  * at the SCTP layer. So use the value from
4327                                  * the IP layer.
4328                                  */
4329                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4330                         }
4331                         flowlabel &= 0x000fffff;
4332                         len = SCTP_MIN_OVERHEAD;
4333                         if (port) {
4334                                 len += sizeof(struct udphdr);
4335                         }
4336                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4337                         if (newm == NULL) {
4338                                 sctp_m_freem(m);
4339                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4340                                 return (ENOMEM);
4341                         }
4342                         SCTP_ALIGN_TO_END(newm, len);
4343                         SCTP_BUF_LEN(newm) = len;
4344                         SCTP_BUF_NEXT(newm) = m;
4345                         m = newm;
4346                         if (net != NULL) {
4347                                 m->m_pkthdr.flowid = net->flowid;
4348                                 M_HASHTYPE_SET(m, net->flowtype);
4349                         } else {
4350                                 m->m_pkthdr.flowid = mflowid;
4351                                 M_HASHTYPE_SET(m, mflowtype);
4352                         }
4353                         packet_length = sctp_calculate_len(m);
4354
4355                         ip6h = mtod(m, struct ip6_hdr *);
4356                         /* protect *sin6 from overwrite */
4357                         sin6 = (struct sockaddr_in6 *)to;
4358                         tmp = *sin6;
4359                         sin6 = &tmp;
4360
4361                         /* KAME hack: embed scopeid */
4362                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4363                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4364                                 return (EINVAL);
4365                         }
4366                         if (net == NULL) {
4367                                 memset(&ip6route, 0, sizeof(ip6route));
4368                                 ro = (sctp_route_t *)&ip6route;
4369                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4370                         } else {
4371                                 ro = (sctp_route_t *)&net->ro;
4372                         }
4373                         /*
4374                          * We assume here that inp_flow is in host byte
4375                          * order within the TCB!
4376                          */
4377                         if (tos_value == 0) {
4378                                 /*
4379                                  * This means especially, that it is not set
4380                                  * at the SCTP layer. So use the value from
4381                                  * the IP layer.
4382                                  */
4383                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4384                         }
4385                         tos_value &= 0xfc;
4386                         if (ecn_ok) {
4387                                 tos_value |= sctp_get_ect(stcb);
4388                         }
4389                         flowinfo = 0x06;
4390                         flowinfo <<= 8;
4391                         flowinfo |= tos_value;
4392                         flowinfo <<= 20;
4393                         flowinfo |= flowlabel;
4394                         ip6h->ip6_flow = htonl(flowinfo);
4395                         if (port) {
4396                                 ip6h->ip6_nxt = IPPROTO_UDP;
4397                         } else {
4398                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4399                         }
4400                         ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4401                         ip6h->ip6_dst = sin6->sin6_addr;
4402
4403                         /*
4404                          * Add SRC address selection here: we can only reuse
4405                          * to a limited degree the kame src-addr-sel, since
4406                          * we can try their selection but it may not be
4407                          * bound.
4408                          */
4409                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4410                         lsa6_tmp.sin6_family = AF_INET6;
4411                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4412                         lsa6 = &lsa6_tmp;
4413                         if (net && out_of_asoc_ok == 0) {
4414                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4415                                         sctp_free_ifa(net->ro._s_addr);
4416                                         net->ro._s_addr = NULL;
4417                                         net->src_addr_selected = 0;
4418                                         if (ro->ro_rt) {
4419                                                 RTFREE(ro->ro_rt);
4420                                                 ro->ro_rt = NULL;
4421                                         }
4422                                 }
4423                                 if (net->src_addr_selected == 0) {
4424                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4425                                         /* KAME hack: embed scopeid */
4426                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4427                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4428                                                 return (EINVAL);
4429                                         }
4430                                         /* Cache the source address */
4431                                         net->ro._s_addr = sctp_source_address_selection(inp,
4432                                             stcb,
4433                                             ro,
4434                                             net,
4435                                             0,
4436                                             vrf_id);
4437                                         (void)sa6_recoverscope(sin6);
4438                                         net->src_addr_selected = 1;
4439                                 }
4440                                 if (net->ro._s_addr == NULL) {
4441                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4442                                         net->src_addr_selected = 0;
4443                                         sctp_handle_no_route(stcb, net, so_locked);
4444                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4445                                         sctp_m_freem(m);
4446                                         return (EHOSTUNREACH);
4447                                 }
4448                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4449                         } else {
4450                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4451                                 /* KAME hack: embed scopeid */
4452                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4453                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4454                                         return (EINVAL);
4455                                 }
4456                                 if (over_addr == NULL) {
4457                                         struct sctp_ifa *_lsrc;
4458
4459                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4460                                             net,
4461                                             out_of_asoc_ok,
4462                                             vrf_id);
4463                                         if (_lsrc == NULL) {
4464                                                 sctp_handle_no_route(stcb, net, so_locked);
4465                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4466                                                 sctp_m_freem(m);
4467                                                 return (EHOSTUNREACH);
4468                                         }
4469                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4470                                         sctp_free_ifa(_lsrc);
4471                                 } else {
4472                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4473                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4474                                 }
4475                                 (void)sa6_recoverscope(sin6);
4476                         }
4477                         lsa6->sin6_port = inp->sctp_lport;
4478
4479                         if (ro->ro_rt == NULL) {
4480                                 /*
4481                                  * src addr selection failed to find a route
4482                                  * (or valid source addr), so we can't get
4483                                  * there from here!
4484                                  */
4485                                 sctp_handle_no_route(stcb, net, so_locked);
4486                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4487                                 sctp_m_freem(m);
4488                                 return (EHOSTUNREACH);
4489                         }
4490                         /*
4491                          * XXX: sa6 may not have a valid sin6_scope_id in
4492                          * the non-SCOPEDROUTING case.
4493                          */
4494                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4495                         lsa6_storage.sin6_family = AF_INET6;
4496                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4497                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4498                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4499                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4500                                 sctp_m_freem(m);
4501                                 return (error);
4502                         }
4503                         /* XXX */
4504                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4505                         lsa6_storage.sin6_port = inp->sctp_lport;
4506                         lsa6 = &lsa6_storage;
4507                         ip6h->ip6_src = lsa6->sin6_addr;
4508
4509                         if (port) {
4510                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4511                                         sctp_handle_no_route(stcb, net, so_locked);
4512                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4513                                         sctp_m_freem(m);
4514                                         return (EHOSTUNREACH);
4515                                 }
4516                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4517                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4518                                 udp->uh_dport = port;
4519                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4520                                 udp->uh_sum = 0;
4521                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4522                         } else {
4523                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4524                         }
4525
4526                         sctphdr->src_port = src_port;
4527                         sctphdr->dest_port = dest_port;
4528                         sctphdr->v_tag = v_tag;
4529                         sctphdr->checksum = 0;
4530
4531                         /*
4532                          * We set the hop limit now since there is a good
4533                          * chance that our ro pointer is now filled
4534                          */
4535                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4536                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4537
4538 #ifdef SCTP_DEBUG
4539                         /* Copy to be sure something bad is not happening */
4540                         sin6->sin6_addr = ip6h->ip6_dst;
4541                         lsa6->sin6_addr = ip6h->ip6_src;
4542 #endif
4543
4544                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4546                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4547                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4548                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4549                         if (net) {
4550                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4551                                 /*
4552                                  * preserve the port and scope for link
4553                                  * local send
4554                                  */
4555                                 prev_scope = sin6->sin6_scope_id;
4556                                 prev_port = sin6->sin6_port;
4557                         }
4558                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4559                                 /* failed to prepend data, give up */
4560                                 sctp_m_freem(m);
4561                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4562                                 return (ENOMEM);
4563                         }
4564                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4565                         if (port) {
4566 #if defined(SCTP_WITH_NO_CSUM)
4567                                 SCTP_STAT_INCR(sctps_sendnocrc);
4568 #else
4569                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4570                                 SCTP_STAT_INCR(sctps_sendswcrc);
4571 #endif
4572                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4573                                         udp->uh_sum = 0xffff;
4574                                 }
4575                         } else {
4576 #if defined(SCTP_WITH_NO_CSUM)
4577                                 SCTP_STAT_INCR(sctps_sendnocrc);
4578 #else
4579                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4580                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4581                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4582 #endif
4583                         }
4584                         /* send it out. table id is taken from stcb */
4585 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4586                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4587                                 so = SCTP_INP_SO(inp);
4588                                 SCTP_SOCKET_UNLOCK(so, 0);
4589                         }
4590 #endif
4591 #ifdef SCTP_PACKET_LOGGING
4592                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4593                                 sctp_packet_log(o_pak);
4594 #endif
4595                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4596 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4597                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4598                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4599                                 SCTP_TCB_UNLOCK(stcb);
4600                                 SCTP_SOCKET_LOCK(so, 0);
4601                                 SCTP_TCB_LOCK(stcb);
4602                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4603                         }
4604 #endif
4605                         if (net) {
4606                                 /* for link local this must be done */
4607                                 sin6->sin6_scope_id = prev_scope;
4608                                 sin6->sin6_port = prev_port;
4609                         }
4610                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4611                         SCTP_STAT_INCR(sctps_sendpackets);
4612                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4613                         if (ret) {
4614                                 SCTP_STAT_INCR(sctps_senderrors);
4615                         }
4616                         if (net == NULL) {
4617                                 /* Now if we had a temp route free it */
4618                                 RO_RTFREE(ro);
4619                         } else {
4620                                 /*
4621                                  * PMTU check versus smallest asoc MTU goes
4622                                  * here
4623                                  */
4624                                 if (ro->ro_rt == NULL) {
4625                                         /* Route was freed */
4626                                         if (net->ro._s_addr &&
4627                                             net->src_addr_selected) {
4628                                                 sctp_free_ifa(net->ro._s_addr);
4629                                                 net->ro._s_addr = NULL;
4630                                         }
4631                                         net->src_addr_selected = 0;
4632                                 }
4633                                 if ((ro->ro_rt != NULL) &&
4634                                     (net->ro._s_addr)) {
4635                                         uint32_t mtu;
4636
4637                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4638                                         if (mtu > 0) {
4639                                                 if (net->port) {
4640                                                         mtu -= sizeof(struct udphdr);
4641                                                 }
4642                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4643                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4644                                                 }
4645                                                 net->mtu = mtu;
4646                                         }
4647                                 } else if (ifp) {
4648                                         if (ND_IFINFO(ifp)->linkmtu &&
4649                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4650                                                 sctp_mtu_size_reset(inp,
4651                                                     &stcb->asoc,
4652                                                     ND_IFINFO(ifp)->linkmtu);
4653                                         }
4654                                 }
4655                         }
4656                         return (ret);
4657                 }
4658 #endif
4659         default:
4660                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4661                     ((struct sockaddr *)to)->sa_family);
4662                 sctp_m_freem(m);
4663                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4664                 return (EFAULT);
4665         }
4666 }
4667
4668
4669 void
4670 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4671 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4672     SCTP_UNUSED
4673 #endif
4674 )
4675 {
4676         struct mbuf *m, *m_last;
4677         struct sctp_nets *net;
4678         struct sctp_init_chunk *init;
4679         struct sctp_supported_addr_param *sup_addr;
4680         struct sctp_adaptation_layer_indication *ali;
4681         struct sctp_supported_chunk_types_param *pr_supported;
4682         struct sctp_paramhdr *ph;
4683         int cnt_inits_to = 0;
4684         int error;
4685         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4686
4687         /* INIT's always go to the primary (and usually ONLY address) */
4688         net = stcb->asoc.primary_destination;
4689         if (net == NULL) {
4690                 net = TAILQ_FIRST(&stcb->asoc.nets);
4691                 if (net == NULL) {
4692                         /* TSNH */
4693                         return;
4694                 }
4695                 /* we confirm any address we send an INIT to */
4696                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4697                 (void)sctp_set_primary_addr(stcb, NULL, net);
4698         } else {
4699                 /* we confirm any address we send an INIT to */
4700                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4701         }
4702         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4703 #ifdef INET6
4704         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4705                 /*
4706                  * special hook, if we are sending to link local it will not
4707                  * show up in our private address count.
4708                  */
4709                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4710                         cnt_inits_to = 1;
4711         }
4712 #endif
4713         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4714                 /* This case should not happen */
4715                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4716                 return;
4717         }
4718         /* start the INIT timer */
4719         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4720
4721         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4722         if (m == NULL) {
4723                 /* No memory, INIT timer will re-attempt. */
4724                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4725                 return;
4726         }
4727         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4728         padding_len = 0;
4729         /* Now lets put the chunk header in place */
4730         init = mtod(m, struct sctp_init_chunk *);
4731         /* now the chunk header */
4732         init->ch.chunk_type = SCTP_INITIATION;
4733         init->ch.chunk_flags = 0;
4734         /* fill in later from mbuf we build */
4735         init->ch.chunk_length = 0;
4736         /* place in my tag */
4737         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4738         /* set up some of the credits. */
4739         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4740             SCTP_MINIMAL_RWND));
4741         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4742         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4743         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4744
4745         /* Adaptation layer indication parameter */
4746         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4747                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4748                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4749                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4750                 ali->ph.param_length = htons(parameter_len);
4751                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4752                 chunk_len += parameter_len;
4753         }
4754         /* ECN parameter */
4755         if (stcb->asoc.ecn_supported == 1) {
4756                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4757                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4758                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4759                 ph->param_length = htons(parameter_len);
4760                 chunk_len += parameter_len;
4761         }
4762         /* PR-SCTP supported parameter */
4763         if (stcb->asoc.prsctp_supported == 1) {
4764                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4765                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4766                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4767                 ph->param_length = htons(parameter_len);
4768                 chunk_len += parameter_len;
4769         }
4770         /* Add NAT friendly parameter. */
4771         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4772                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4773                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4774                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4775                 ph->param_length = htons(parameter_len);
4776                 chunk_len += parameter_len;
4777         }
4778         /* And now tell the peer which extensions we support */
4779         num_ext = 0;
4780         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4781         if (stcb->asoc.prsctp_supported == 1) {
4782                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4783                 if (stcb->asoc.idata_supported) {
4784                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4785                 }
4786         }
4787         if (stcb->asoc.auth_supported == 1) {
4788                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4789         }
4790         if (stcb->asoc.asconf_supported == 1) {
4791                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4792                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4793         }
4794         if (stcb->asoc.reconfig_supported == 1) {
4795                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4796         }
4797         if (stcb->asoc.idata_supported) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4799         }
4800         if (stcb->asoc.nrsack_supported == 1) {
4801                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4802         }
4803         if (stcb->asoc.pktdrop_supported == 1) {
4804                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4805         }
4806         if (num_ext > 0) {
4807                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4808                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4809                 pr_supported->ph.param_length = htons(parameter_len);
4810                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4811                 chunk_len += parameter_len;
4812         }
4813         /* add authentication parameters */
4814         if (stcb->asoc.auth_supported) {
4815                 /* attach RANDOM parameter, if available */
4816                 if (stcb->asoc.authinfo.random != NULL) {
4817                         struct sctp_auth_random *randp;
4818
4819                         if (padding_len > 0) {
4820                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4821                                 chunk_len += padding_len;
4822                                 padding_len = 0;
4823                         }
4824                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4825                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4826                         /* random key already contains the header */
4827                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4828                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4829                         chunk_len += parameter_len;
4830                 }
4831                 /* add HMAC_ALGO parameter */
4832                 if (stcb->asoc.local_hmacs != NULL) {
4833                         struct sctp_auth_hmac_algo *hmacs;
4834
4835                         if (padding_len > 0) {
4836                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4837                                 chunk_len += padding_len;
4838                                 padding_len = 0;
4839                         }
4840                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4841                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4842                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4843                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4844                         hmacs->ph.param_length = htons(parameter_len);
4845                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4846                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4847                         chunk_len += parameter_len;
4848                 }
4849                 /* add CHUNKS parameter */
4850                 if (stcb->asoc.local_auth_chunks != NULL) {
4851                         struct sctp_auth_chunk_list *chunks;
4852
4853                         if (padding_len > 0) {
4854                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4855                                 chunk_len += padding_len;
4856                                 padding_len = 0;
4857                         }
4858                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4859                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4860                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4861                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4862                         chunks->ph.param_length = htons(parameter_len);
4863                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4864                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4865                         chunk_len += parameter_len;
4866                 }
4867         }
4868         /* now any cookie time extensions */
4869         if (stcb->asoc.cookie_preserve_req) {
4870                 struct sctp_cookie_perserve_param *cookie_preserve;
4871
4872                 if (padding_len > 0) {
4873                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4874                         chunk_len += padding_len;
4875                         padding_len = 0;
4876                 }
4877                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4878                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4879                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4880                 cookie_preserve->ph.param_length = htons(parameter_len);
4881                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4882                 stcb->asoc.cookie_preserve_req = 0;
4883                 chunk_len += parameter_len;
4884         }
4885         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4886                 uint8_t i;
4887
4888                 if (padding_len > 0) {
4889                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4890                         chunk_len += padding_len;
4891                         padding_len = 0;
4892                 }
4893                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4894                 if (stcb->asoc.scope.ipv4_addr_legal) {
4895                         parameter_len += (uint16_t)sizeof(uint16_t);
4896                 }
4897                 if (stcb->asoc.scope.ipv6_addr_legal) {
4898                         parameter_len += (uint16_t)sizeof(uint16_t);
4899                 }
4900                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4901                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4902                 sup_addr->ph.param_length = htons(parameter_len);
4903                 i = 0;
4904                 if (stcb->asoc.scope.ipv4_addr_legal) {
4905                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4906                 }
4907                 if (stcb->asoc.scope.ipv6_addr_legal) {
4908                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4909                 }
4910                 padding_len = 4 - 2 * i;
4911                 chunk_len += parameter_len;
4912         }
4913         SCTP_BUF_LEN(m) = chunk_len;
4914         /* now the addresses */
4915         /*
4916          * To optimize this we could put the scoping stuff into a structure
4917          * and remove the individual uint8's from the assoc structure. Then
4918          * we could just sifa in the address within the stcb. But for now
4919          * this is a quick hack to get the address stuff teased apart.
4920          */
4921         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4922             m, cnt_inits_to,
4923             &padding_len, &chunk_len);
4924
4925         init->ch.chunk_length = htons(chunk_len);
4926         if (padding_len > 0) {
4927                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4928                         sctp_m_freem(m);
4929                         return;
4930                 }
4931         }
4932         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4933         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4934             (struct sockaddr *)&net->ro._l_addr,
4935             m, 0, NULL, 0, 0, 0, 0,
4936             inp->sctp_lport, stcb->rport, htonl(0),
4937             net->port, NULL,
4938             0, 0,
4939             so_locked))) {
4940                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4941                 if (error == ENOBUFS) {
4942                         stcb->asoc.ifp_had_enobuf = 1;
4943                         SCTP_STAT_INCR(sctps_lowlevelerr);
4944                 }
4945         } else {
4946                 stcb->asoc.ifp_had_enobuf = 0;
4947         }
4948         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4949         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4950 }
4951
4952 struct mbuf *
4953 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4954     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4955 {
4956         /*
4957          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4958          * being equal to the beginning of the params i.e. (iphlen +
4959          * sizeof(struct sctp_init_msg) parse through the parameters to the
4960          * end of the mbuf verifying that all parameters are known.
4961          *
4962          * For unknown parameters build and return a mbuf with
4963          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4964          * processing this chunk stop, and set *abort_processing to 1.
4965          *
4966          * By having param_offset be pre-set to where parameters begin it is
4967          * hoped that this routine may be reused in the future by new
4968          * features.
4969          */
4970         struct sctp_paramhdr *phdr, params;
4971
4972         struct mbuf *mat, *op_err;
4973         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4974         int at, limit, pad_needed;
4975         uint16_t ptype, plen, padded_size;
4976         int err_at;
4977
4978         *abort_processing = 0;
4979         mat = in_initpkt;
4980         err_at = 0;
4981         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4982         at = param_offset;
4983         op_err = NULL;
4984         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4985         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4986         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4987                 ptype = ntohs(phdr->param_type);
4988                 plen = ntohs(phdr->param_length);
4989                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4990                         /* wacked parameter */
4991                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4992                         goto invalid_size;
4993                 }
4994                 limit -= SCTP_SIZE32(plen);
4995                 /*-
4996                  * All parameters for all chunks that we know/understand are
4997                  * listed here. We process them other places and make
4998                  * appropriate stop actions per the upper bits. However this
4999                  * is the generic routine processor's can call to get back
5000                  * an operr.. to either incorporate (init-ack) or send.
5001                  */
5002                 padded_size = SCTP_SIZE32(plen);
5003                 switch (ptype) {
5004                         /* Param's with variable size */
5005                 case SCTP_HEARTBEAT_INFO:
5006                 case SCTP_STATE_COOKIE:
5007                 case SCTP_UNRECOG_PARAM:
5008                 case SCTP_ERROR_CAUSE_IND:
5009                         /* ok skip fwd */
5010                         at += padded_size;
5011                         break;
5012                         /* Param's with variable size within a range */
5013                 case SCTP_CHUNK_LIST:
5014                 case SCTP_SUPPORTED_CHUNK_EXT:
5015                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5016                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5017                                 goto invalid_size;
5018                         }
5019                         at += padded_size;
5020                         break;
5021                 case SCTP_SUPPORTED_ADDRTYPE:
5022                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5023                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5024                                 goto invalid_size;
5025                         }
5026                         at += padded_size;
5027                         break;
5028                 case SCTP_RANDOM:
5029                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5030                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5031                                 goto invalid_size;
5032                         }
5033                         at += padded_size;
5034                         break;
5035                 case SCTP_SET_PRIM_ADDR:
5036                 case SCTP_DEL_IP_ADDRESS:
5037                 case SCTP_ADD_IP_ADDRESS:
5038                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5039                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5040                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5041                                 goto invalid_size;
5042                         }
5043                         at += padded_size;
5044                         break;
5045                         /* Param's with a fixed size */
5046                 case SCTP_IPV4_ADDRESS:
5047                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5048                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5049                                 goto invalid_size;
5050                         }
5051                         at += padded_size;
5052                         break;
5053                 case SCTP_IPV6_ADDRESS:
5054                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5055                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5056                                 goto invalid_size;
5057                         }
5058                         at += padded_size;
5059                         break;
5060                 case SCTP_COOKIE_PRESERVE:
5061                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5062                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5063                                 goto invalid_size;
5064                         }
5065                         at += padded_size;
5066                         break;
5067                 case SCTP_HAS_NAT_SUPPORT:
5068                         *nat_friendly = 1;
5069                         /* fall through */
5070                 case SCTP_PRSCTP_SUPPORTED:
5071                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5072                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5073                                 goto invalid_size;
5074                         }
5075                         at += padded_size;
5076                         break;
5077                 case SCTP_ECN_CAPABLE:
5078                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5079                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5080                                 goto invalid_size;
5081                         }
5082                         at += padded_size;
5083                         break;
5084                 case SCTP_ULP_ADAPTATION:
5085                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5086                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5087                                 goto invalid_size;
5088                         }
5089                         at += padded_size;
5090                         break;
5091                 case SCTP_SUCCESS_REPORT:
5092                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5093                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5094                                 goto invalid_size;
5095                         }
5096                         at += padded_size;
5097                         break;
5098                 case SCTP_HOSTNAME_ADDRESS:
5099                         {
5100                                 /* We can NOT handle HOST NAME addresses!! */
5101                                 int l_len;
5102
5103                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5104                                 *abort_processing = 1;
5105                                 if (op_err == NULL) {
5106                                         /* Ok need to try to get a mbuf */
5107 #ifdef INET6
5108                                         l_len = SCTP_MIN_OVERHEAD;
5109 #else
5110                                         l_len = SCTP_MIN_V4_OVERHEAD;
5111 #endif
5112                                         l_len += sizeof(struct sctp_chunkhdr);
5113                                         l_len += plen;
5114                                         l_len += sizeof(struct sctp_paramhdr);
5115                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5116                                         if (op_err) {
5117                                                 SCTP_BUF_LEN(op_err) = 0;
5118                                                 /*
5119                                                  * pre-reserve space for ip
5120                                                  * and sctp header  and
5121                                                  * chunk hdr
5122                                                  */
5123 #ifdef INET6
5124                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5125 #else
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5127 #endif
5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5130                                         }
5131                                 }
5132                                 if (op_err) {
5133                                         /* If we have space */
5134                                         struct sctp_paramhdr s;
5135
5136                                         if (err_at % 4) {
5137                                                 uint32_t cpthis = 0;
5138
5139                                                 pad_needed = 4 - (err_at % 4);
5140                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5141                                                 err_at += pad_needed;
5142                                         }
5143                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5144                                         s.param_length = htons(sizeof(s) + plen);
5145                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5146                                         err_at += sizeof(s);
5147                                         if (plen > sizeof(tempbuf)) {
5148                                                 plen = sizeof(tempbuf);
5149                                         }
5150                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5151                                         if (phdr == NULL) {
5152                                                 sctp_m_freem(op_err);
5153                                                 /*
5154                                                  * we are out of memory but
5155                                                  * we still need to have a
5156                                                  * look at what to do (the
5157                                                  * system is in trouble
5158                                                  * though).
5159                                                  */
5160                                                 return (NULL);
5161                                         }
5162                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5163                                 }
5164                                 return (op_err);
5165                                 break;
5166                         }
5167                 default:
5168                         /*
5169                          * we do not recognize the parameter figure out what
5170                          * we do.
5171                          */
5172                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5173                         if ((ptype & 0x4000) == 0x4000) {
5174                                 /* Report bit is set?? */
5175                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5176                                 if (op_err == NULL) {
5177                                         int l_len;
5178
5179                                         /* Ok need to try to get an mbuf */
5180 #ifdef INET6
5181                                         l_len = SCTP_MIN_OVERHEAD;
5182 #else
5183                                         l_len = SCTP_MIN_V4_OVERHEAD;
5184 #endif
5185                                         l_len += sizeof(struct sctp_chunkhdr);
5186                                         l_len += plen;
5187                                         l_len += sizeof(struct sctp_paramhdr);
5188                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5189                                         if (op_err) {
5190                                                 SCTP_BUF_LEN(op_err) = 0;
5191 #ifdef INET6
5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5193 #else
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5195 #endif
5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5197                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5198                                         }
5199                                 }
5200                                 if (op_err) {
5201                                         /* If we have space */
5202                                         struct sctp_paramhdr s;
5203
5204                                         if (err_at % 4) {
5205                                                 uint32_t cpthis = 0;
5206
5207                                                 pad_needed = 4 - (err_at % 4);
5208                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5209                                                 err_at += pad_needed;
5210                                         }
5211                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5212                                         s.param_length = htons(sizeof(s) + plen);
5213                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5214                                         err_at += sizeof(s);
5215                                         if (plen > sizeof(tempbuf)) {
5216                                                 plen = sizeof(tempbuf);
5217                                         }
5218                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5219                                         if (phdr == NULL) {
5220                                                 sctp_m_freem(op_err);
5221                                                 /*
5222                                                  * we are out of memory but
5223                                                  * we still need to have a
5224                                                  * look at what to do (the
5225                                                  * system is in trouble
5226                                                  * though).
5227                                                  */
5228                                                 op_err = NULL;
5229                                                 goto more_processing;
5230                                         }
5231                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5232                                         err_at += plen;
5233                                 }
5234                         }
5235         more_processing:
5236                         if ((ptype & 0x8000) == 0x0000) {
5237                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5238                                 return (op_err);
5239                         } else {
5240                                 /* skip this chunk and continue processing */
5241                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5242                                 at += SCTP_SIZE32(plen);
5243                         }
5244                         break;
5245
5246                 }
5247                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5248         }
5249         return (op_err);
5250 invalid_size:
5251         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5252         *abort_processing = 1;
5253         if ((op_err == NULL) && phdr) {
5254                 int l_len;
5255 #ifdef INET6
5256                 l_len = SCTP_MIN_OVERHEAD;
5257 #else
5258                 l_len = SCTP_MIN_V4_OVERHEAD;
5259 #endif
5260                 l_len += sizeof(struct sctp_chunkhdr);
5261                 l_len += (2 * sizeof(struct sctp_paramhdr));
5262                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5263                 if (op_err) {
5264                         SCTP_BUF_LEN(op_err) = 0;
5265 #ifdef INET6
5266                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5267 #else
5268                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5269 #endif
5270                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5271                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5272                 }
5273         }
5274         if ((op_err) && phdr) {
5275                 struct sctp_paramhdr s;
5276
5277                 if (err_at % 4) {
5278                         uint32_t cpthis = 0;
5279
5280                         pad_needed = 4 - (err_at % 4);
5281                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5282                         err_at += pad_needed;
5283                 }
5284                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5285                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5286                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5287                 err_at += sizeof(s);
5288                 /* Only copy back the p-hdr that caused the issue */
5289                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5290         }
5291         return (op_err);
5292 }
5293
5294 static int
5295 sctp_are_there_new_addresses(struct sctp_association *asoc,
5296     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5297 {
5298         /*
5299          * Given a INIT packet, look through the packet to verify that there
5300          * are NO new addresses. As we go through the parameters add reports
5301          * of any un-understood parameters that require an error.  Also we
5302          * must return (1) to drop the packet if we see a un-understood
5303          * parameter that tells us to drop the chunk.
5304          */
5305         struct sockaddr *sa_touse;
5306         struct sockaddr *sa;
5307         struct sctp_paramhdr *phdr, params;
5308         uint16_t ptype, plen;
5309         uint8_t fnd;
5310         struct sctp_nets *net;
5311         int check_src;
5312 #ifdef INET
5313         struct sockaddr_in sin4, *sa4;
5314 #endif
5315 #ifdef INET6
5316         struct sockaddr_in6 sin6, *sa6;
5317 #endif
5318
5319 #ifdef INET
5320         memset(&sin4, 0, sizeof(sin4));
5321         sin4.sin_family = AF_INET;
5322         sin4.sin_len = sizeof(sin4);
5323 #endif
5324 #ifdef INET6
5325         memset(&sin6, 0, sizeof(sin6));
5326         sin6.sin6_family = AF_INET6;
5327         sin6.sin6_len = sizeof(sin6);
5328 #endif
5329         /* First what about the src address of the pkt ? */
5330         check_src = 0;
5331         switch (src->sa_family) {
5332 #ifdef INET
5333         case AF_INET:
5334                 if (asoc->scope.ipv4_addr_legal) {
5335                         check_src = 1;
5336                 }
5337                 break;
5338 #endif
5339 #ifdef INET6
5340         case AF_INET6:
5341                 if (asoc->scope.ipv6_addr_legal) {
5342                         check_src = 1;
5343                 }
5344                 break;
5345 #endif
5346         default:
5347                 /* TSNH */
5348                 break;
5349         }
5350         if (check_src) {
5351                 fnd = 0;
5352                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5353                         sa = (struct sockaddr *)&net->ro._l_addr;
5354                         if (sa->sa_family == src->sa_family) {
5355 #ifdef INET
5356                                 if (sa->sa_family == AF_INET) {
5357                                         struct sockaddr_in *src4;
5358
5359                                         sa4 = (struct sockaddr_in *)sa;
5360                                         src4 = (struct sockaddr_in *)src;
5361                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5362                                                 fnd = 1;
5363                                                 break;
5364                                         }
5365                                 }
5366 #endif
5367 #ifdef INET6
5368                                 if (sa->sa_family == AF_INET6) {
5369                                         struct sockaddr_in6 *src6;
5370
5371                                         sa6 = (struct sockaddr_in6 *)sa;
5372                                         src6 = (struct sockaddr_in6 *)src;
5373                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5374                                                 fnd = 1;
5375                                                 break;
5376                                         }
5377                                 }
5378 #endif
5379                         }
5380                 }
5381                 if (fnd == 0) {
5382                         /* New address added! no need to look further. */
5383                         return (1);
5384                 }
5385         }
5386         /* Ok so far lets munge through the rest of the packet */
5387         offset += sizeof(struct sctp_init_chunk);
5388         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5389         while (phdr) {
5390                 sa_touse = NULL;
5391                 ptype = ntohs(phdr->param_type);
5392                 plen = ntohs(phdr->param_length);
5393                 switch (ptype) {
5394 #ifdef INET
5395                 case SCTP_IPV4_ADDRESS:
5396                         {
5397                                 struct sctp_ipv4addr_param *p4, p4_buf;
5398
5399                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5400                                         return (1);
5401                                 }
5402                                 phdr = sctp_get_next_param(in_initpkt, offset,
5403                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5404                                 if (phdr == NULL) {
5405                                         return (1);
5406                                 }
5407                                 if (asoc->scope.ipv4_addr_legal) {
5408                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5409                                         sin4.sin_addr.s_addr = p4->addr;
5410                                         sa_touse = (struct sockaddr *)&sin4;
5411                                 }
5412                                 break;
5413                         }
5414 #endif
5415 #ifdef INET6
5416                 case SCTP_IPV6_ADDRESS:
5417                         {
5418                                 struct sctp_ipv6addr_param *p6, p6_buf;
5419
5420                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5421                                         return (1);
5422                                 }
5423                                 phdr = sctp_get_next_param(in_initpkt, offset,
5424                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5425                                 if (phdr == NULL) {
5426                                         return (1);
5427                                 }
5428                                 if (asoc->scope.ipv6_addr_legal) {
5429                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5430                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5431                                             sizeof(p6->addr));
5432                                         sa_touse = (struct sockaddr *)&sin6;
5433                                 }
5434                                 break;
5435                         }
5436 #endif
5437                 default:
5438                         sa_touse = NULL;
5439                         break;
5440                 }
5441                 if (sa_touse) {
5442                         /* ok, sa_touse points to one to check */
5443                         fnd = 0;
5444                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5445                                 sa = (struct sockaddr *)&net->ro._l_addr;
5446                                 if (sa->sa_family != sa_touse->sa_family) {
5447                                         continue;
5448                                 }
5449 #ifdef INET
5450                                 if (sa->sa_family == AF_INET) {
5451                                         sa4 = (struct sockaddr_in *)sa;
5452                                         if (sa4->sin_addr.s_addr ==
5453                                             sin4.sin_addr.s_addr) {
5454                                                 fnd = 1;
5455                                                 break;
5456                                         }
5457                                 }
5458 #endif
5459 #ifdef INET6
5460                                 if (sa->sa_family == AF_INET6) {
5461                                         sa6 = (struct sockaddr_in6 *)sa;
5462                                         if (SCTP6_ARE_ADDR_EQUAL(
5463                                             sa6, &sin6)) {
5464                                                 fnd = 1;
5465                                                 break;
5466                                         }
5467                                 }
5468 #endif
5469                         }
5470                         if (!fnd) {
5471                                 /* New addr added! no need to look further */
5472                                 return (1);
5473                         }
5474                 }
5475                 offset += SCTP_SIZE32(plen);
5476                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5477         }
5478         return (0);
5479 }
5480
5481 /*
5482  * Given a MBUF chain that was sent into us containing an INIT. Build a
5483  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5484  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5485  * message (i.e. the struct sctp_init_msg).
5486  */
5487 void
5488 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5489     struct sctp_nets *src_net, struct mbuf *init_pkt,
5490     int iphlen, int offset,
5491     struct sockaddr *src, struct sockaddr *dst,
5492     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5493     uint8_t mflowtype, uint32_t mflowid,
5494     uint32_t vrf_id, uint16_t port)
5495 {
5496         struct sctp_association *asoc;
5497         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5498         struct sctp_init_ack_chunk *initack;
5499         struct sctp_adaptation_layer_indication *ali;
5500         struct sctp_supported_chunk_types_param *pr_supported;
5501         struct sctp_paramhdr *ph;
5502         union sctp_sockstore *over_addr;
5503         struct sctp_scoping scp;
5504         struct timeval now;
5505 #ifdef INET
5506         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5507         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5508         struct sockaddr_in *sin;
5509 #endif
5510 #ifdef INET6
5511         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5512         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5513         struct sockaddr_in6 *sin6;
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         int error;
5524         struct socket *so;
5525         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5526
5527         if (stcb) {
5528                 asoc = &stcb->asoc;
5529         } else {
5530                 asoc = NULL;
5531         }
5532         if ((asoc != NULL) &&
5533             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5534                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5535                         /*
5536                          * new addresses, out of here in non-cookie-wait
5537                          * states
5538                          *
5539                          * Send an ABORT, without the new address error
5540                          * cause. This looks no different than if no
5541                          * listener was present.
5542                          */
5543                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5544                             "Address added");
5545                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5546                             mflowtype, mflowid, inp->fibnum,
5547                             vrf_id, port);
5548                         return;
5549                 }
5550                 if (src_net != NULL && (src_net->port != port)) {
5551                         /*
5552                          * change of remote encapsulation port, out of here
5553                          * in non-cookie-wait states
5554                          *
5555                          * Send an ABORT, without an specific error cause.
5556                          * This looks no different than if no listener was
5557                          * present.
5558                          */
5559                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5560                             "Remote encapsulation port changed");
5561                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5562                             mflowtype, mflowid, inp->fibnum,
5563                             vrf_id, port);
5564                         return;
5565                 }
5566         }
5567         abort_flag = 0;
5568         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5569             (offset + sizeof(struct sctp_init_chunk)),
5570             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5571         if (abort_flag) {
5572 do_a_abort:
5573                 if (op_err == NULL) {
5574                         char msg[SCTP_DIAG_INFO_LEN];
5575
5576                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5577                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5578                             msg);
5579                 }
5580                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5581                     init_chk->init.initiate_tag, op_err,
5582                     mflowtype, mflowid, inp->fibnum,
5583                     vrf_id, port);
5584                 return;
5585         }
5586         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5587         if (m == NULL) {
5588                 /* No memory, INIT timer will re-attempt. */
5589                 if (op_err)
5590                         sctp_m_freem(op_err);
5591                 return;
5592         }
5593         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5594         padding_len = 0;
5595
5596         /*
5597          * We might not overwrite the identification[] completely and on
5598          * some platforms time_entered will contain some padding. Therefore
5599          * zero out the cookie to avoid putting uninitialized memory on the
5600          * wire.
5601          */
5602         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5603
5604         /* the time I built cookie */
5605         (void)SCTP_GETTIME_TIMEVAL(&now);
5606         stc.time_entered.tv_sec = now.tv_sec;
5607         stc.time_entered.tv_usec = now.tv_usec;
5608
5609         /* populate any tie tags */
5610         if (asoc != NULL) {
5611                 /* unlock before tag selections */
5612                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5613                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5614                 stc.cookie_life = asoc->cookie_life;
5615                 net = asoc->primary_destination;
5616         } else {
5617                 stc.tie_tag_my_vtag = 0;
5618                 stc.tie_tag_peer_vtag = 0;
5619                 /* life I will award this cookie */
5620                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5621         }
5622
5623         /* copy in the ports for later check */
5624         stc.myport = sh->dest_port;
5625         stc.peerport = sh->src_port;
5626
5627         /*
5628          * If we wanted to honor cookie life extensions, we would add to
5629          * stc.cookie_life. For now we should NOT honor any extension
5630          */
5631         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5632         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5633                 stc.ipv6_addr_legal = 1;
5634                 if (SCTP_IPV6_V6ONLY(inp)) {
5635                         stc.ipv4_addr_legal = 0;
5636                 } else {
5637                         stc.ipv4_addr_legal = 1;
5638                 }
5639         } else {
5640                 stc.ipv6_addr_legal = 0;
5641                 stc.ipv4_addr_legal = 1;
5642         }
5643         stc.ipv4_scope = 0;
5644         if (net == NULL) {
5645                 to = src;
5646                 switch (dst->sa_family) {
5647 #ifdef INET
5648                 case AF_INET:
5649                         {
5650                                 /* lookup address */
5651                                 stc.address[0] = src4->sin_addr.s_addr;
5652                                 stc.address[1] = 0;
5653                                 stc.address[2] = 0;
5654                                 stc.address[3] = 0;
5655                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5656                                 /* local from address */
5657                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5658                                 stc.laddress[1] = 0;
5659                                 stc.laddress[2] = 0;
5660                                 stc.laddress[3] = 0;
5661                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5662                                 /* scope_id is only for v6 */
5663                                 stc.scope_id = 0;
5664                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5665                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5666                                         stc.ipv4_scope = 1;
5667                                 }
5668                                 /* Must use the address in this case */
5669                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5670                                         stc.loopback_scope = 1;
5671                                         stc.ipv4_scope = 1;
5672                                         stc.site_scope = 1;
5673                                         stc.local_scope = 0;
5674                                 }
5675                                 break;
5676                         }
5677 #endif
5678 #ifdef INET6
5679                 case AF_INET6:
5680                         {
5681                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5682                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5683                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5684                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5685                                         stc.loopback_scope = 1;
5686                                         stc.local_scope = 0;
5687                                         stc.site_scope = 1;
5688                                         stc.ipv4_scope = 1;
5689                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5690                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5691                                         /*
5692                                          * If the new destination or source
5693                                          * is a LINK_LOCAL we must have
5694                                          * common both site and local scope.
5695                                          * Don't set local scope though
5696                                          * since we must depend on the
5697                                          * source to be added implicitly. We
5698                                          * cannot assure just because we
5699                                          * share one link that all links are
5700                                          * common.
5701                                          */
5702                                         stc.local_scope = 0;
5703                                         stc.site_scope = 1;
5704                                         stc.ipv4_scope = 1;
5705                                         /*
5706                                          * we start counting for the private
5707                                          * address stuff at 1. since the
5708                                          * link local we source from won't
5709                                          * show up in our scoped count.
5710                                          */
5711                                         cnt_inits_to = 1;
5712                                         /*
5713                                          * pull out the scope_id from
5714                                          * incoming pkt
5715                                          */
5716                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5717                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5718                                         /*
5719                                          * If the new destination or source
5720                                          * is SITE_LOCAL then we must have
5721                                          * site scope in common.
5722                                          */
5723                                         stc.site_scope = 1;
5724                                 }
5725                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5726                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5727                                 break;
5728                         }
5729 #endif
5730                 default:
5731                         /* TSNH */
5732                         goto do_a_abort;
5733                         break;
5734                 }
5735         } else {
5736                 /* set the scope per the existing tcb */
5737
5738 #ifdef INET6
5739                 struct sctp_nets *lnet;
5740 #endif
5741
5742                 stc.loopback_scope = asoc->scope.loopback_scope;
5743                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5744                 stc.site_scope = asoc->scope.site_scope;
5745                 stc.local_scope = asoc->scope.local_scope;
5746 #ifdef INET6
5747                 /* Why do we not consider IPv4 LL addresses? */
5748                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5749                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5750                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5751                                         /*
5752                                          * if we have a LL address, start
5753                                          * counting at 1.
5754                                          */
5755                                         cnt_inits_to = 1;
5756                                 }
5757                         }
5758                 }
5759 #endif
5760                 /* use the net pointer */
5761                 to = (struct sockaddr *)&net->ro._l_addr;
5762                 switch (to->sa_family) {
5763 #ifdef INET
5764                 case AF_INET:
5765                         sin = (struct sockaddr_in *)to;
5766                         stc.address[0] = sin->sin_addr.s_addr;
5767                         stc.address[1] = 0;
5768                         stc.address[2] = 0;
5769                         stc.address[3] = 0;
5770                         stc.addr_type = SCTP_IPV4_ADDRESS;
5771                         if (net->src_addr_selected == 0) {
5772                                 /*
5773                                  * strange case here, the INIT should have
5774                                  * did the selection.
5775                                  */
5776                                 net->ro._s_addr = sctp_source_address_selection(inp,
5777                                     stcb, (sctp_route_t *)&net->ro,
5778                                     net, 0, vrf_id);
5779                                 if (net->ro._s_addr == NULL)
5780                                         return;
5781
5782                                 net->src_addr_selected = 1;
5783
5784                         }
5785                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5786                         stc.laddress[1] = 0;
5787                         stc.laddress[2] = 0;
5788                         stc.laddress[3] = 0;
5789                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5790                         /* scope_id is only for v6 */
5791                         stc.scope_id = 0;
5792                         break;
5793 #endif
5794 #ifdef INET6
5795                 case AF_INET6:
5796                         sin6 = (struct sockaddr_in6 *)to;
5797                         memcpy(&stc.address, &sin6->sin6_addr,
5798                             sizeof(struct in6_addr));
5799                         stc.addr_type = SCTP_IPV6_ADDRESS;
5800                         stc.scope_id = sin6->sin6_scope_id;
5801                         if (net->src_addr_selected == 0) {
5802                                 /*
5803                                  * strange case here, the INIT should have
5804                                  * done the selection.
5805                                  */
5806                                 net->ro._s_addr = sctp_source_address_selection(inp,
5807                                     stcb, (sctp_route_t *)&net->ro,
5808                                     net, 0, vrf_id);
5809                                 if (net->ro._s_addr == NULL)
5810                                         return;
5811
5812                                 net->src_addr_selected = 1;
5813                         }
5814                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5815                             sizeof(struct in6_addr));
5816                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5817                         break;
5818 #endif
5819                 }
5820         }
5821         /* Now lets put the SCTP header in place */
5822         initack = mtod(m, struct sctp_init_ack_chunk *);
5823         /* Save it off for quick ref */
5824         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5825         /* who are we */
5826         memcpy(stc.identification, SCTP_VERSION_STRING,
5827             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5828         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5829         /* now the chunk header */
5830         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5831         initack->ch.chunk_flags = 0;
5832         /* fill in later from mbuf we build */
5833         initack->ch.chunk_length = 0;
5834         /* place in my tag */
5835         if ((asoc != NULL) &&
5836             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5837             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5838             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5839                 /* re-use the v-tags and init-seq here */
5840                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5841                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5842         } else {
5843                 uint32_t vtag, itsn;
5844
5845                 if (asoc) {
5846                         atomic_add_int(&asoc->refcnt, 1);
5847                         SCTP_TCB_UNLOCK(stcb);
5848         new_tag:
5849                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5850                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5851                                 /*
5852                                  * Got a duplicate vtag on some guy behind a
5853                                  * nat make sure we don't use it.
5854                                  */
5855                                 goto new_tag;
5856                         }
5857                         initack->init.initiate_tag = htonl(vtag);
5858                         /* get a TSN to use too */
5859                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5860                         initack->init.initial_tsn = htonl(itsn);
5861                         SCTP_TCB_LOCK(stcb);
5862                         atomic_add_int(&asoc->refcnt, -1);
5863                 } else {
5864                         SCTP_INP_INCR_REF(inp);
5865                         SCTP_INP_RUNLOCK(inp);
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                         SCTP_INP_RLOCK(inp);
5871                         SCTP_INP_DECR_REF(inp);
5872                 }
5873         }
5874         /* save away my tag to */
5875         stc.my_vtag = initack->init.initiate_tag;
5876
5877         /* set up some of the credits. */
5878         so = inp->sctp_socket;
5879         if (so == NULL) {
5880                 /* memory problem */
5881                 sctp_m_freem(m);
5882                 return;
5883         } else {
5884                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5885         }
5886         /* set what I want */
5887         his_limit = ntohs(init_chk->init.num_inbound_streams);
5888         /* choose what I want */
5889         if (asoc != NULL) {
5890                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5891                         i_want = asoc->streamoutcnt;
5892                 } else {
5893                         i_want = asoc->pre_open_streams;
5894                 }
5895         } else {
5896                 i_want = inp->sctp_ep.pre_open_stream_count;
5897         }
5898         if (his_limit < i_want) {
5899                 /* I Want more :< */
5900                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5901         } else {
5902                 /* I can have what I want :> */
5903                 initack->init.num_outbound_streams = htons(i_want);
5904         }
5905         /* tell him his limit. */
5906         initack->init.num_inbound_streams =
5907             htons(inp->sctp_ep.max_open_streams_intome);
5908
5909         /* adaptation layer indication parameter */
5910         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5911                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5912                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5913                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5914                 ali->ph.param_length = htons(parameter_len);
5915                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5916                 chunk_len += parameter_len;
5917         }
5918         /* ECN parameter */
5919         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5920             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5921                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5922                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5923                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5924                 ph->param_length = htons(parameter_len);
5925                 chunk_len += parameter_len;
5926         }
5927         /* PR-SCTP supported parameter */
5928         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5929             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5930                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5931                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5932                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5933                 ph->param_length = htons(parameter_len);
5934                 chunk_len += parameter_len;
5935         }
5936         /* Add NAT friendly parameter */
5937         if (nat_friendly) {
5938                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5939                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5940                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5941                 ph->param_length = htons(parameter_len);
5942                 chunk_len += parameter_len;
5943         }
5944         /* And now tell the peer which extensions we support */
5945         num_ext = 0;
5946         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5947         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5948             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5949                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5950                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5951                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5952                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5953                 }
5954         }
5955         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5956             ((asoc == NULL) && (inp->auth_supported == 1))) {
5957                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5958         }
5959         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5960             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5961                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5962                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5963         }
5964         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5965             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5966                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5967         }
5968         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5969             ((asoc == NULL) && (inp->idata_supported == 1))) {
5970                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5971         }
5972         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5973             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5974                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5975         }
5976         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5977             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5978                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5979         }
5980         if (num_ext > 0) {
5981                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5982                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5983                 pr_supported->ph.param_length = htons(parameter_len);
5984                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5985                 chunk_len += parameter_len;
5986         }
5987         /* add authentication parameters */
5988         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5989             ((asoc == NULL) && (inp->auth_supported == 1))) {
5990                 struct sctp_auth_random *randp;
5991                 struct sctp_auth_hmac_algo *hmacs;
5992                 struct sctp_auth_chunk_list *chunks;
5993
5994                 if (padding_len > 0) {
5995                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5996                         chunk_len += padding_len;
5997                         padding_len = 0;
5998                 }
5999                 /* generate and add RANDOM parameter */
6000                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6001                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6002                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6003                 randp->ph.param_type = htons(SCTP_RANDOM);
6004                 randp->ph.param_length = htons(parameter_len);
6005                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6006                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6007                 chunk_len += parameter_len;
6008
6009                 if (padding_len > 0) {
6010                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6011                         chunk_len += padding_len;
6012                         padding_len = 0;
6013                 }
6014                 /* add HMAC_ALGO parameter */
6015                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6016                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6017                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6018                     (uint8_t *)hmacs->hmac_ids);
6019                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6020                 hmacs->ph.param_length = htons(parameter_len);
6021                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6022                 chunk_len += parameter_len;
6023
6024                 if (padding_len > 0) {
6025                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6026                         chunk_len += padding_len;
6027                         padding_len = 0;
6028                 }
6029                 /* add CHUNKS parameter */
6030                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6031                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6032                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6033                     chunks->chunk_types);
6034                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6035                 chunks->ph.param_length = htons(parameter_len);
6036                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6037                 chunk_len += parameter_len;
6038         }
6039         SCTP_BUF_LEN(m) = chunk_len;
6040         m_last = m;
6041         /* now the addresses */
6042         /*
6043          * To optimize this we could put the scoping stuff into a structure
6044          * and remove the individual uint8's from the stc structure. Then we
6045          * could just sifa in the address within the stc.. but for now this
6046          * is a quick hack to get the address stuff teased apart.
6047          */
6048         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6049         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6050         scp.loopback_scope = stc.loopback_scope;
6051         scp.ipv4_local_scope = stc.ipv4_scope;
6052         scp.local_scope = stc.local_scope;
6053         scp.site_scope = stc.site_scope;
6054         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6055             cnt_inits_to,
6056             &padding_len, &chunk_len);
6057         /* padding_len can only be positive, if no addresses have been added */
6058         if (padding_len > 0) {
6059                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6060                 chunk_len += padding_len;
6061                 SCTP_BUF_LEN(m) += padding_len;
6062                 padding_len = 0;
6063         }
6064         /* tack on the operational error if present */
6065         if (op_err) {
6066                 parameter_len = 0;
6067                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6068                         parameter_len += SCTP_BUF_LEN(m_tmp);
6069                 }
6070                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6071                 SCTP_BUF_NEXT(m_last) = op_err;
6072                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6073                         m_last = SCTP_BUF_NEXT(m_last);
6074                 }
6075                 chunk_len += parameter_len;
6076         }
6077         if (padding_len > 0) {
6078                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6079                 if (m_last == NULL) {
6080                         /* Houston we have a problem, no space */
6081                         sctp_m_freem(m);
6082                         return;
6083                 }
6084                 chunk_len += padding_len;
6085                 padding_len = 0;
6086         }
6087         /* Now we must build a cookie */
6088         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6089         if (m_cookie == NULL) {
6090                 /* memory problem */
6091                 sctp_m_freem(m);
6092                 return;
6093         }
6094         /* Now append the cookie to the end and update the space/size */
6095         SCTP_BUF_NEXT(m_last) = m_cookie;
6096         parameter_len = 0;
6097         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6098                 parameter_len += SCTP_BUF_LEN(m_tmp);
6099                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6100                         m_last = m_tmp;
6101                 }
6102         }
6103         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6104         chunk_len += parameter_len;
6105
6106         /*
6107          * Place in the size, but we don't include the last pad (if any) in
6108          * the INIT-ACK.
6109          */
6110         initack->ch.chunk_length = htons(chunk_len);
6111
6112         /*
6113          * Time to sign the cookie, we don't sign over the cookie signature
6114          * though thus we set trailer.
6115          */
6116         (void)sctp_hmac_m(SCTP_HMAC,
6117             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6118             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6119             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6120         /*
6121          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6122          * here since the timer will drive a retranmission.
6123          */
6124         if (padding_len > 0) {
6125                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6126                         sctp_m_freem(m);
6127                         return;
6128                 }
6129         }
6130         if (stc.loopback_scope) {
6131                 over_addr = (union sctp_sockstore *)dst;
6132         } else {
6133                 over_addr = NULL;
6134         }
6135
6136         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6137             0, 0,
6138             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6139             port, over_addr,
6140             mflowtype, mflowid,
6141             SCTP_SO_NOT_LOCKED))) {
6142                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6143                 if (error == ENOBUFS) {
6144                         if (asoc != NULL) {
6145                                 asoc->ifp_had_enobuf = 1;
6146                         }
6147                         SCTP_STAT_INCR(sctps_lowlevelerr);
6148                 }
6149         } else {
6150                 if (asoc != NULL) {
6151                         asoc->ifp_had_enobuf = 0;
6152                 }
6153         }
6154         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6155 }
6156
6157
6158 static void
6159 sctp_prune_prsctp(struct sctp_tcb *stcb,
6160     struct sctp_association *asoc,
6161     struct sctp_sndrcvinfo *srcv,
6162     int dataout)
6163 {
6164         int freed_spc = 0;
6165         struct sctp_tmit_chunk *chk, *nchk;
6166
6167         SCTP_TCB_LOCK_ASSERT(stcb);
6168         if ((asoc->prsctp_supported) &&
6169             (asoc->sent_queue_cnt_removeable > 0)) {
6170                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6171                         /*
6172                          * Look for chunks marked with the PR_SCTP flag AND
6173                          * the buffer space flag. If the one being sent is
6174                          * equal or greater priority then purge the old one
6175                          * and free some space.
6176                          */
6177                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6178                                 /*
6179                                  * This one is PR-SCTP AND buffer space
6180                                  * limited type
6181                                  */
6182                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6183                                         /*
6184                                          * Lower numbers equates to higher
6185                                          * priority so if the one we are
6186                                          * looking at has a larger or equal
6187                                          * priority we want to drop the data
6188                                          * and NOT retransmit it.
6189                                          */
6190                                         if (chk->data) {
6191                                                 /*
6192                                                  * We release the book_size
6193                                                  * if the mbuf is here
6194                                                  */
6195                                                 int ret_spc;
6196                                                 uint8_t sent;
6197
6198                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6199                                                         sent = 1;
6200                                                 else
6201                                                         sent = 0;
6202                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6203                                                     sent,
6204                                                     SCTP_SO_LOCKED);
6205                                                 freed_spc += ret_spc;
6206                                                 if (freed_spc >= dataout) {
6207                                                         return;
6208                                                 }
6209                                         }       /* if chunk was present */
6210                                 }       /* if of sufficient priority */
6211                         }       /* if chunk has enabled */
6212                 }               /* tailqforeach */
6213
6214                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6215                         /* Here we must move to the sent queue and mark */
6216                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6217                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6218                                         if (chk->data) {
6219                                                 /*
6220                                                  * We release the book_size
6221                                                  * if the mbuf is here
6222                                                  */
6223                                                 int ret_spc;
6224
6225                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6226                                                     0, SCTP_SO_LOCKED);
6227
6228                                                 freed_spc += ret_spc;
6229                                                 if (freed_spc >= dataout) {
6230                                                         return;
6231                                                 }
6232                                         }       /* end if chk->data */
6233                                 }       /* end if right class */
6234                         }       /* end if chk pr-sctp */
6235                 }               /* tailqforeachsafe (chk) */
6236         }                       /* if enabled in asoc */
6237 }
6238
6239 int
6240 sctp_get_frag_point(struct sctp_tcb *stcb,
6241     struct sctp_association *asoc)
6242 {
6243         int siz, ovh;
6244
6245         /*
6246          * For endpoints that have both v6 and v4 addresses we must reserve
6247          * room for the ipv6 header, for those that are only dealing with V4
6248          * we use a larger frag point.
6249          */
6250         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6251                 ovh = SCTP_MIN_OVERHEAD;
6252         } else {
6253                 ovh = SCTP_MIN_V4_OVERHEAD;
6254         }
6255         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6256         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6257                 siz = asoc->smallest_mtu - ovh;
6258         else
6259                 siz = (stcb->asoc.sctp_frag_point - ovh);
6260         /*
6261          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6262          */
6263         /* A data chunk MUST fit in a cluster */
6264         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6265         /* } */
6266
6267         /* adjust for an AUTH chunk if DATA requires auth */
6268         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6269                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6270
6271         if (siz % 4) {
6272                 /* make it an even word boundary please */
6273                 siz -= (siz % 4);
6274         }
6275         return (siz);
6276 }
6277
6278 static void
6279 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6280 {
6281         /*
6282          * We assume that the user wants PR_SCTP_TTL if the user provides a
6283          * positive lifetime but does not specify any PR_SCTP policy.
6284          */
6285         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6286                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6287         } else if (sp->timetolive > 0) {
6288                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6289                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6290         } else {
6291                 return;
6292         }
6293         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6294         case CHUNK_FLAGS_PR_SCTP_BUF:
6295                 /*
6296                  * Time to live is a priority stored in tv_sec when doing
6297                  * the buffer drop thing.
6298                  */
6299                 sp->ts.tv_sec = sp->timetolive;
6300                 sp->ts.tv_usec = 0;
6301                 break;
6302         case CHUNK_FLAGS_PR_SCTP_TTL:
6303                 {
6304                         struct timeval tv;
6305
6306                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6307                         tv.tv_sec = sp->timetolive / 1000;
6308                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6309                         /*
6310                          * TODO sctp_constants.h needs alternative time
6311                          * macros when _KERNEL is undefined.
6312                          */
6313                         timevaladd(&sp->ts, &tv);
6314                 }
6315                 break;
6316         case CHUNK_FLAGS_PR_SCTP_RTX:
6317                 /*
6318                  * Time to live is a the number or retransmissions stored in
6319                  * tv_sec.
6320                  */
6321                 sp->ts.tv_sec = sp->timetolive;
6322                 sp->ts.tv_usec = 0;
6323                 break;
6324         default:
6325                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6326                     "Unknown PR_SCTP policy %u.\n",
6327                     PR_SCTP_POLICY(sp->sinfo_flags));
6328                 break;
6329         }
6330 }
6331
6332 static int
6333 sctp_msg_append(struct sctp_tcb *stcb,
6334     struct sctp_nets *net,
6335     struct mbuf *m,
6336     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6337 {
6338         int error = 0;
6339         struct mbuf *at;
6340         struct sctp_stream_queue_pending *sp = NULL;
6341         struct sctp_stream_out *strm;
6342
6343         /*
6344          * Given an mbuf chain, put it into the association send queue and
6345          * place it on the wheel
6346          */
6347         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6348                 /* Invalid stream number */
6349                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6350                 error = EINVAL;
6351                 goto out_now;
6352         }
6353         if ((stcb->asoc.stream_locked) &&
6354             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6355                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6356                 error = EINVAL;
6357                 goto out_now;
6358         }
6359         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6360         /* Now can we send this? */
6361         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6362             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6363             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6364             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6365                 /* got data while shutting down */
6366                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6367                 error = ECONNRESET;
6368                 goto out_now;
6369         }
6370         sctp_alloc_a_strmoq(stcb, sp);
6371         if (sp == NULL) {
6372                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6373                 error = ENOMEM;
6374                 goto out_now;
6375         }
6376         sp->sinfo_flags = srcv->sinfo_flags;
6377         sp->timetolive = srcv->sinfo_timetolive;
6378         sp->ppid = srcv->sinfo_ppid;
6379         sp->context = srcv->sinfo_context;
6380         sp->fsn = 0;
6381         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6382                 sp->net = net;
6383                 atomic_add_int(&sp->net->ref_count, 1);
6384         } else {
6385                 sp->net = NULL;
6386         }
6387         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6388         sp->sid = srcv->sinfo_stream;
6389         sp->msg_is_complete = 1;
6390         sp->sender_all_done = 1;
6391         sp->some_taken = 0;
6392         sp->data = m;
6393         sp->tail_mbuf = NULL;
6394         sctp_set_prsctp_policy(sp);
6395         /*
6396          * We could in theory (for sendall) sifa the length in, but we would
6397          * still have to hunt through the chain since we need to setup the
6398          * tail_mbuf
6399          */
6400         sp->length = 0;
6401         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6402                 if (SCTP_BUF_NEXT(at) == NULL)
6403                         sp->tail_mbuf = at;
6404                 sp->length += SCTP_BUF_LEN(at);
6405         }
6406         if (srcv->sinfo_keynumber_valid) {
6407                 sp->auth_keyid = srcv->sinfo_keynumber;
6408         } else {
6409                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6410         }
6411         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6412                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6413                 sp->holds_key_ref = 1;
6414         }
6415         if (hold_stcb_lock == 0) {
6416                 SCTP_TCB_SEND_LOCK(stcb);
6417         }
6418         sctp_snd_sb_alloc(stcb, sp->length);
6419         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6420         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6421         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6422         m = NULL;
6423         if (hold_stcb_lock == 0) {
6424                 SCTP_TCB_SEND_UNLOCK(stcb);
6425         }
6426 out_now:
6427         if (m) {
6428                 sctp_m_freem(m);
6429         }
6430         return (error);
6431 }
6432
6433
6434 static struct mbuf *
6435 sctp_copy_mbufchain(struct mbuf *clonechain,
6436     struct mbuf *outchain,
6437     struct mbuf **endofchain,
6438     int can_take_mbuf,
6439     int sizeofcpy,
6440     uint8_t copy_by_ref)
6441 {
6442         struct mbuf *m;
6443         struct mbuf *appendchain;
6444         caddr_t cp;
6445         int len;
6446
6447         if (endofchain == NULL) {
6448                 /* error */
6449 error_out:
6450                 if (outchain)
6451                         sctp_m_freem(outchain);
6452                 return (NULL);
6453         }
6454         if (can_take_mbuf) {
6455                 appendchain = clonechain;
6456         } else {
6457                 if (!copy_by_ref &&
6458                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6459                     ) {
6460                         /* Its not in a cluster */
6461                         if (*endofchain == NULL) {
6462                                 /* lets get a mbuf cluster */
6463                                 if (outchain == NULL) {
6464                                         /* This is the general case */
6465                         new_mbuf:
6466                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6467                                         if (outchain == NULL) {
6468                                                 goto error_out;
6469                                         }
6470                                         SCTP_BUF_LEN(outchain) = 0;
6471                                         *endofchain = outchain;
6472                                         /* get the prepend space */
6473                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6474                                 } else {
6475                                         /*
6476                                          * We really should not get a NULL
6477                                          * in endofchain
6478                                          */
6479                                         /* find end */
6480                                         m = outchain;
6481                                         while (m) {
6482                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6483                                                         *endofchain = m;
6484                                                         break;
6485                                                 }
6486                                                 m = SCTP_BUF_NEXT(m);
6487                                         }
6488                                         /* sanity */
6489                                         if (*endofchain == NULL) {
6490                                                 /*
6491                                                  * huh, TSNH XXX maybe we
6492                                                  * should panic
6493                                                  */
6494                                                 sctp_m_freem(outchain);
6495                                                 goto new_mbuf;
6496                                         }
6497                                 }
6498                                 /* get the new end of length */
6499                                 len = (int)M_TRAILINGSPACE(*endofchain);
6500                         } else {
6501                                 /* how much is left at the end? */
6502                                 len = (int)M_TRAILINGSPACE(*endofchain);
6503                         }
6504                         /* Find the end of the data, for appending */
6505                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6506
6507                         /* Now lets copy it out */
6508                         if (len >= sizeofcpy) {
6509                                 /* It all fits, copy it in */
6510                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6511                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6512                         } else {
6513                                 /* fill up the end of the chain */
6514                                 if (len > 0) {
6515                                         m_copydata(clonechain, 0, len, cp);
6516                                         SCTP_BUF_LEN((*endofchain)) += len;
6517                                         /* now we need another one */
6518                                         sizeofcpy -= len;
6519                                 }
6520                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6521                                 if (m == NULL) {
6522                                         /* We failed */
6523                                         goto error_out;
6524                                 }
6525                                 SCTP_BUF_NEXT((*endofchain)) = m;
6526                                 *endofchain = m;
6527                                 cp = mtod((*endofchain), caddr_t);
6528                                 m_copydata(clonechain, len, sizeofcpy, cp);
6529                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6530                         }
6531                         return (outchain);
6532                 } else {
6533                         /* copy the old fashion way */
6534                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6535 #ifdef SCTP_MBUF_LOGGING
6536                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6537                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6538                         }
6539 #endif
6540                 }
6541         }
6542         if (appendchain == NULL) {
6543                 /* error */
6544                 if (outchain)
6545                         sctp_m_freem(outchain);
6546                 return (NULL);
6547         }
6548         if (outchain) {
6549                 /* tack on to the end */
6550                 if (*endofchain != NULL) {
6551                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6552                 } else {
6553                         m = outchain;
6554                         while (m) {
6555                                 if (SCTP_BUF_NEXT(m) == NULL) {
6556                                         SCTP_BUF_NEXT(m) = appendchain;
6557                                         break;
6558                                 }
6559                                 m = SCTP_BUF_NEXT(m);
6560                         }
6561                 }
6562                 /*
6563                  * save off the end and update the end-chain position
6564                  */
6565                 m = appendchain;
6566                 while (m) {
6567                         if (SCTP_BUF_NEXT(m) == NULL) {
6568                                 *endofchain = m;
6569                                 break;
6570                         }
6571                         m = SCTP_BUF_NEXT(m);
6572                 }
6573                 return (outchain);
6574         } else {
6575                 /* save off the end and update the end-chain position */
6576                 m = appendchain;
6577                 while (m) {
6578                         if (SCTP_BUF_NEXT(m) == NULL) {
6579                                 *endofchain = m;
6580                                 break;
6581                         }
6582                         m = SCTP_BUF_NEXT(m);
6583                 }
6584                 return (appendchain);
6585         }
6586 }
6587
6588 static int
6589 sctp_med_chunk_output(struct sctp_inpcb *inp,
6590     struct sctp_tcb *stcb,
6591     struct sctp_association *asoc,
6592     int *num_out,
6593     int *reason_code,
6594     int control_only, int from_where,
6595     struct timeval *now, int *now_filled, int frag_point, int so_locked
6596 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6597     SCTP_UNUSED
6598 #endif
6599 );
6600
6601 static void
6602 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6603     uint32_t val SCTP_UNUSED)
6604 {
6605         struct sctp_copy_all *ca;
6606         struct mbuf *m;
6607         int ret = 0;
6608         int added_control = 0;
6609         int un_sent, do_chunk_output = 1;
6610         struct sctp_association *asoc;
6611         struct sctp_nets *net;
6612
6613         ca = (struct sctp_copy_all *)ptr;
6614         if (ca->m == NULL) {
6615                 return;
6616         }
6617         if (ca->inp != inp) {
6618                 /* TSNH */
6619                 return;
6620         }
6621         if (ca->sndlen > 0) {
6622                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6623                 if (m == NULL) {
6624                         /* can't copy so we are done */
6625                         ca->cnt_failed++;
6626                         return;
6627                 }
6628 #ifdef SCTP_MBUF_LOGGING
6629                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6630                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6631                 }
6632 #endif
6633         } else {
6634                 m = NULL;
6635         }
6636         SCTP_TCB_LOCK_ASSERT(stcb);
6637         if (stcb->asoc.alternate) {
6638                 net = stcb->asoc.alternate;
6639         } else {
6640                 net = stcb->asoc.primary_destination;
6641         }
6642         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6643                 /* Abort this assoc with m as the user defined reason */
6644                 if (m != NULL) {
6645                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6646                 } else {
6647                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6648                             0, M_NOWAIT, 1, MT_DATA);
6649                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6650                 }
6651                 if (m != NULL) {
6652                         struct sctp_paramhdr *ph;
6653
6654                         ph = mtod(m, struct sctp_paramhdr *);
6655                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6656                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6657                 }
6658                 /*
6659                  * We add one here to keep the assoc from dis-appearing on
6660                  * us.
6661                  */
6662                 atomic_add_int(&stcb->asoc.refcnt, 1);
6663                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6664                 /*
6665                  * sctp_abort_an_association calls sctp_free_asoc() free
6666                  * association will NOT free it since we incremented the
6667                  * refcnt .. we do this to prevent it being freed and things
6668                  * getting tricky since we could end up (from free_asoc)
6669                  * calling inpcb_free which would get a recursive lock call
6670                  * to the iterator lock.. But as a consequence of that the
6671                  * stcb will return to us un-locked.. since free_asoc
6672                  * returns with either no TCB or the TCB unlocked, we must
6673                  * relock.. to unlock in the iterator timer :-0
6674                  */
6675                 SCTP_TCB_LOCK(stcb);
6676                 atomic_add_int(&stcb->asoc.refcnt, -1);
6677                 goto no_chunk_output;
6678         } else {
6679                 if (m) {
6680                         ret = sctp_msg_append(stcb, net, m,
6681                             &ca->sndrcv, 1);
6682                 }
6683                 asoc = &stcb->asoc;
6684                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6685                         /* shutdown this assoc */
6686                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6687                             TAILQ_EMPTY(&asoc->sent_queue) &&
6688                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6689                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6690                                         goto abort_anyway;
6691                                 }
6692                                 /*
6693                                  * there is nothing queued to send, so I'm
6694                                  * done...
6695                                  */
6696                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6697                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6698                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6699                                         /*
6700                                          * only send SHUTDOWN the first time
6701                                          * through
6702                                          */
6703                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6704                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6705                                         }
6706                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6707                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6708                                         sctp_stop_timers_for_shutdown(stcb);
6709                                         sctp_send_shutdown(stcb, net);
6710                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6711                                             net);
6712                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6713                                             asoc->primary_destination);
6714                                         added_control = 1;
6715                                         do_chunk_output = 0;
6716                                 }
6717                         } else {
6718                                 /*
6719                                  * we still got (or just got) data to send,
6720                                  * so set SHUTDOWN_PENDING
6721                                  */
6722                                 /*
6723                                  * XXX sockets draft says that SCTP_EOF
6724                                  * should be sent with no data.  currently,
6725                                  * we will allow user data to be sent first
6726                                  * and move to SHUTDOWN-PENDING
6727                                  */
6728                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6729                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6730                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6731                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6732                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6733                                         }
6734                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6735                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6736                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6737                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6738                                                 struct mbuf *op_err;
6739                                                 char msg[SCTP_DIAG_INFO_LEN];
6740
6741                                 abort_anyway:
6742                                                 snprintf(msg, sizeof(msg),
6743                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6744                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6745                                                     msg);
6746                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6747                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6748                                                     op_err, SCTP_SO_NOT_LOCKED);
6749                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6750                                                 goto no_chunk_output;
6751                                         }
6752                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6753                                             asoc->primary_destination);
6754                                 }
6755                         }
6756
6757                 }
6758         }
6759         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6760             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6761
6762         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6763             (stcb->asoc.total_flight > 0) &&
6764             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6765                 do_chunk_output = 0;
6766         }
6767         if (do_chunk_output)
6768                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6769         else if (added_control) {
6770                 int num_out, reason, now_filled = 0;
6771                 struct timeval now;
6772                 int frag_point;
6773
6774                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6775                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6776                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6777         }
6778 no_chunk_output:
6779         if (ret) {
6780                 ca->cnt_failed++;
6781         } else {
6782                 ca->cnt_sent++;
6783         }
6784 }
6785
6786 static void
6787 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6788 {
6789         struct sctp_copy_all *ca;
6790
6791         ca = (struct sctp_copy_all *)ptr;
6792         /*
6793          * Do a notify here? Kacheong suggests that the notify be done at
6794          * the send time.. so you would push up a notification if any send
6795          * failed. Don't know if this is feasible since the only failures we
6796          * have is "memory" related and if you cannot get an mbuf to send
6797          * the data you surely can't get an mbuf to send up to notify the
6798          * user you can't send the data :->
6799          */
6800
6801         /* now free everything */
6802         sctp_m_freem(ca->m);
6803         SCTP_FREE(ca, SCTP_M_COPYAL);
6804 }
6805
6806 static struct mbuf *
6807 sctp_copy_out_all(struct uio *uio, int len)
6808 {
6809         struct mbuf *ret, *at;
6810         int left, willcpy, cancpy, error;
6811
6812         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6813         if (ret == NULL) {
6814                 /* TSNH */
6815                 return (NULL);
6816         }
6817         left = len;
6818         SCTP_BUF_LEN(ret) = 0;
6819         /* save space for the data chunk header */
6820         cancpy = (int)M_TRAILINGSPACE(ret);
6821         willcpy = min(cancpy, left);
6822         at = ret;
6823         while (left > 0) {
6824                 /* Align data to the end */
6825                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6826                 if (error) {
6827         err_out_now:
6828                         sctp_m_freem(at);
6829                         return (NULL);
6830                 }
6831                 SCTP_BUF_LEN(at) = willcpy;
6832                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6833                 left -= willcpy;
6834                 if (left > 0) {
6835                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6836                         if (SCTP_BUF_NEXT(at) == NULL) {
6837                                 goto err_out_now;
6838                         }
6839                         at = SCTP_BUF_NEXT(at);
6840                         SCTP_BUF_LEN(at) = 0;
6841                         cancpy = (int)M_TRAILINGSPACE(at);
6842                         willcpy = min(cancpy, left);
6843                 }
6844         }
6845         return (ret);
6846 }
6847
6848 static int
6849 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6850     struct sctp_sndrcvinfo *srcv)
6851 {
6852         int ret;
6853         struct sctp_copy_all *ca;
6854
6855         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6856             SCTP_M_COPYAL);
6857         if (ca == NULL) {
6858                 sctp_m_freem(m);
6859                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6860                 return (ENOMEM);
6861         }
6862         memset(ca, 0, sizeof(struct sctp_copy_all));
6863
6864         ca->inp = inp;
6865         if (srcv) {
6866                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6867         }
6868         /*
6869          * take off the sendall flag, it would be bad if we failed to do
6870          * this :-0
6871          */
6872         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6873         /* get length and mbuf chain */
6874         if (uio) {
6875                 ca->sndlen = (int)uio->uio_resid;
6876                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6877                 if (ca->m == NULL) {
6878                         SCTP_FREE(ca, SCTP_M_COPYAL);
6879                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6880                         return (ENOMEM);
6881                 }
6882         } else {
6883                 /* Gather the length of the send */
6884                 struct mbuf *mat;
6885
6886                 ca->sndlen = 0;
6887                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6888                         ca->sndlen += SCTP_BUF_LEN(mat);
6889                 }
6890         }
6891         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6892             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6893             SCTP_ASOC_ANY_STATE,
6894             (void *)ca, 0,
6895             sctp_sendall_completes, inp, 1);
6896         if (ret) {
6897                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6898                 SCTP_FREE(ca, SCTP_M_COPYAL);
6899                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6900                 return (EFAULT);
6901         }
6902         return (0);
6903 }
6904
6905
6906 void
6907 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6908 {
6909         struct sctp_tmit_chunk *chk, *nchk;
6910
6911         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6912                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6913                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6914                         if (chk->data) {
6915                                 sctp_m_freem(chk->data);
6916                                 chk->data = NULL;
6917                         }
6918                         asoc->ctrl_queue_cnt--;
6919                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6920                 }
6921         }
6922 }
6923
6924 void
6925 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6926 {
6927         struct sctp_association *asoc;
6928         struct sctp_tmit_chunk *chk, *nchk;
6929         struct sctp_asconf_chunk *acp;
6930
6931         asoc = &stcb->asoc;
6932         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6933                 /* find SCTP_ASCONF chunk in queue */
6934                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6935                         if (chk->data) {
6936                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6937                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6938                                         /* Not Acked yet */
6939                                         break;
6940                                 }
6941                         }
6942                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6943                         if (chk->data) {
6944                                 sctp_m_freem(chk->data);
6945                                 chk->data = NULL;
6946                         }
6947                         asoc->ctrl_queue_cnt--;
6948                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6949                 }
6950         }
6951 }
6952
6953
6954 static void
6955 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6956     struct sctp_association *asoc,
6957     struct sctp_tmit_chunk **data_list,
6958     int bundle_at,
6959     struct sctp_nets *net)
6960 {
6961         int i;
6962         struct sctp_tmit_chunk *tp1;
6963
6964         for (i = 0; i < bundle_at; i++) {
6965                 /* off of the send queue */
6966                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6967                 asoc->send_queue_cnt--;
6968                 if (i > 0) {
6969                         /*
6970                          * Any chunk NOT 0 you zap the time chunk 0 gets
6971                          * zapped or set based on if a RTO measurment is
6972                          * needed.
6973                          */
6974                         data_list[i]->do_rtt = 0;
6975                 }
6976                 /* record time */
6977                 data_list[i]->sent_rcv_time = net->last_sent_time;
6978                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6979                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6980                 if (data_list[i]->whoTo == NULL) {
6981                         data_list[i]->whoTo = net;
6982                         atomic_add_int(&net->ref_count, 1);
6983                 }
6984                 /* on to the sent queue */
6985                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6986                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6987                         struct sctp_tmit_chunk *tpp;
6988
6989                         /* need to move back */
6990         back_up_more:
6991                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6992                         if (tpp == NULL) {
6993                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6994                                 goto all_done;
6995                         }
6996                         tp1 = tpp;
6997                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6998                                 goto back_up_more;
6999                         }
7000                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7001                 } else {
7002                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7003                             data_list[i],
7004                             sctp_next);
7005                 }
7006 all_done:
7007                 /* This does not lower until the cum-ack passes it */
7008                 asoc->sent_queue_cnt++;
7009                 if ((asoc->peers_rwnd <= 0) &&
7010                     (asoc->total_flight == 0) &&
7011                     (bundle_at == 1)) {
7012                         /* Mark the chunk as being a window probe */
7013                         SCTP_STAT_INCR(sctps_windowprobed);
7014                 }
7015 #ifdef SCTP_AUDITING_ENABLED
7016                 sctp_audit_log(0xC2, 3);
7017 #endif
7018                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7019                 data_list[i]->snd_count = 1;
7020                 data_list[i]->rec.data.chunk_was_revoked = 0;
7021                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7022                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7023                             data_list[i]->whoTo->flight_size,
7024                             data_list[i]->book_size,
7025                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7026                             data_list[i]->rec.data.tsn);
7027                 }
7028                 sctp_flight_size_increase(data_list[i]);
7029                 sctp_total_flight_increase(stcb, data_list[i]);
7030                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7031                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7032                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7033                 }
7034                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7035                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7036                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7037                         /* SWS sender side engages */
7038                         asoc->peers_rwnd = 0;
7039                 }
7040         }
7041         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7042                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7043         }
7044 }
7045
7046 static void
7047 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7048 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7049     SCTP_UNUSED
7050 #endif
7051 )
7052 {
7053         struct sctp_tmit_chunk *chk, *nchk;
7054
7055         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7056                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7057                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7058                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7059                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7060                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7061                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7062                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7063                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7064                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7065                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7066                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7067                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7068                         /* Stray chunks must be cleaned up */
7069         clean_up_anyway:
7070                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7071                         if (chk->data) {
7072                                 sctp_m_freem(chk->data);
7073                                 chk->data = NULL;
7074                         }
7075                         asoc->ctrl_queue_cnt--;
7076                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7077                                 asoc->fwd_tsn_cnt--;
7078                         sctp_free_a_chunk(stcb, chk, so_locked);
7079                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7080                         /* special handling, we must look into the param */
7081                         if (chk != asoc->str_reset) {
7082                                 goto clean_up_anyway;
7083                         }
7084                 }
7085         }
7086 }
7087
7088 static uint32_t
7089 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7090     uint32_t space_left, uint32_t frag_point, int eeor_on)
7091 {
7092         /*
7093          * Make a decision on if I should split a msg into multiple parts.
7094          * This is only asked of incomplete messages.
7095          */
7096         if (eeor_on) {
7097                 /*
7098                  * If we are doing EEOR we need to always send it if its the
7099                  * entire thing, since it might be all the guy is putting in
7100                  * the hopper.
7101                  */
7102                 if (space_left >= length) {
7103                         /*-
7104                          * If we have data outstanding,
7105                          * we get another chance when the sack
7106                          * arrives to transmit - wait for more data
7107                          */
7108                         if (stcb->asoc.total_flight == 0) {
7109                                 /*
7110                                  * If nothing is in flight, we zero the
7111                                  * packet counter.
7112                                  */
7113                                 return (length);
7114                         }
7115                         return (0);
7116
7117                 } else {
7118                         /* You can fill the rest */
7119                         return (space_left);
7120                 }
7121         }
7122         /*-
7123          * For those strange folk that make the send buffer
7124          * smaller than our fragmentation point, we can't
7125          * get a full msg in so we have to allow splitting.
7126          */
7127         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7128                 return (length);
7129         }
7130         if ((length <= space_left) ||
7131             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7132                 /* Sub-optimial residual don't split in non-eeor mode. */
7133                 return (0);
7134         }
7135         /*
7136          * If we reach here length is larger than the space_left. Do we wish
7137          * to split it for the sake of packet putting together?
7138          */
7139         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7140                 /* Its ok to split it */
7141                 return (min(space_left, frag_point));
7142         }
7143         /* Nope, can't split */
7144         return (0);
7145 }
7146
7147 static uint32_t
7148 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7149     struct sctp_stream_out *strq,
7150     uint32_t space_left,
7151     uint32_t frag_point,
7152     int *giveup,
7153     int eeor_mode,
7154     int *bail,
7155     int so_locked
7156 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7157     SCTP_UNUSED
7158 #endif
7159 )
7160 {
7161         /* Move from the stream to the send_queue keeping track of the total */
7162         struct sctp_association *asoc;
7163         struct sctp_stream_queue_pending *sp;
7164         struct sctp_tmit_chunk *chk;
7165         struct sctp_data_chunk *dchkh = NULL;
7166         struct sctp_idata_chunk *ndchkh = NULL;
7167         uint32_t to_move, length;
7168         int leading;
7169         uint8_t rcv_flags = 0;
7170         uint8_t some_taken;
7171         uint8_t send_lock_up = 0;
7172
7173         SCTP_TCB_LOCK_ASSERT(stcb);
7174         asoc = &stcb->asoc;
7175 one_more_time:
7176         /* sa_ignore FREED_MEMORY */
7177         sp = TAILQ_FIRST(&strq->outqueue);
7178         if (sp == NULL) {
7179                 if (send_lock_up == 0) {
7180                         SCTP_TCB_SEND_LOCK(stcb);
7181                         send_lock_up = 1;
7182                 }
7183                 sp = TAILQ_FIRST(&strq->outqueue);
7184                 if (sp) {
7185                         goto one_more_time;
7186                 }
7187                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7188                     (stcb->asoc.idata_supported == 0) &&
7189                     (strq->last_msg_incomplete)) {
7190                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7191                             strq->sid,
7192                             strq->last_msg_incomplete);
7193                         strq->last_msg_incomplete = 0;
7194                 }
7195                 to_move = 0;
7196                 if (send_lock_up) {
7197                         SCTP_TCB_SEND_UNLOCK(stcb);
7198                         send_lock_up = 0;
7199                 }
7200                 goto out_of;
7201         }
7202         if ((sp->msg_is_complete) && (sp->length == 0)) {
7203                 if (sp->sender_all_done) {
7204                         /*
7205                          * We are doing differed cleanup. Last time through
7206                          * when we took all the data the sender_all_done was
7207                          * not set.
7208                          */
7209                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7210                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7211                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7212                                     sp->sender_all_done,
7213                                     sp->length,
7214                                     sp->msg_is_complete,
7215                                     sp->put_last_out,
7216                                     send_lock_up);
7217                         }
7218                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7219                                 SCTP_TCB_SEND_LOCK(stcb);
7220                                 send_lock_up = 1;
7221                         }
7222                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7223                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7224                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7225                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7226                             (strq->chunks_on_queues == 0) &&
7227                             TAILQ_EMPTY(&strq->outqueue)) {
7228                                 stcb->asoc.trigger_reset = 1;
7229                         }
7230                         if (sp->net) {
7231                                 sctp_free_remote_addr(sp->net);
7232                                 sp->net = NULL;
7233                         }
7234                         if (sp->data) {
7235                                 sctp_m_freem(sp->data);
7236                                 sp->data = NULL;
7237                         }
7238                         sctp_free_a_strmoq(stcb, sp, so_locked);
7239                         /* we can't be locked to it */
7240                         if (send_lock_up) {
7241                                 SCTP_TCB_SEND_UNLOCK(stcb);
7242                                 send_lock_up = 0;
7243                         }
7244                         /* back to get the next msg */
7245                         goto one_more_time;
7246                 } else {
7247                         /*
7248                          * sender just finished this but still holds a
7249                          * reference
7250                          */
7251                         *giveup = 1;
7252                         to_move = 0;
7253                         goto out_of;
7254                 }
7255         } else {
7256                 /* is there some to get */
7257                 if (sp->length == 0) {
7258                         /* no */
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                         *giveup = 1;
7282                         to_move = 0;
7283                         goto out_of;
7284                 }
7285         }
7286         some_taken = sp->some_taken;
7287 re_look:
7288         length = sp->length;
7289         if (sp->msg_is_complete) {
7290                 /* The message is complete */
7291                 to_move = min(length, frag_point);
7292                 if (to_move == length) {
7293                         /* All of it fits in the MTU */
7294                         if (sp->some_taken) {
7295                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7296                         } else {
7297                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7298                         }
7299                         sp->put_last_out = 1;
7300                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7301                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7302                         }
7303                 } else {
7304                         /* Not all of it fits, we fragment */
7305                         if (sp->some_taken == 0) {
7306                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7307                         }
7308                         sp->some_taken = 1;
7309                 }
7310         } else {
7311                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7312                 if (to_move) {
7313                         /*-
7314                          * We use a snapshot of length in case it
7315                          * is expanding during the compare.
7316                          */
7317                         uint32_t llen;
7318
7319                         llen = length;
7320                         if (to_move >= llen) {
7321                                 to_move = llen;
7322                                 if (send_lock_up == 0) {
7323                                         /*-
7324                                          * We are taking all of an incomplete msg
7325                                          * thus we need a send lock.
7326                                          */
7327                                         SCTP_TCB_SEND_LOCK(stcb);
7328                                         send_lock_up = 1;
7329                                         if (sp->msg_is_complete) {
7330                                                 /*
7331                                                  * the sender finished the
7332                                                  * msg
7333                                                  */
7334                                                 goto re_look;
7335                                         }
7336                                 }
7337                         }
7338                         if (sp->some_taken == 0) {
7339                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7340                                 sp->some_taken = 1;
7341                         }
7342                 } else {
7343                         /* Nothing to take. */
7344                         *giveup = 1;
7345                         to_move = 0;
7346                         goto out_of;
7347                 }
7348         }
7349
7350         /* If we reach here, we can copy out a chunk */
7351         sctp_alloc_a_chunk(stcb, chk);
7352         if (chk == NULL) {
7353                 /* No chunk memory */
7354                 *giveup = 1;
7355                 to_move = 0;
7356                 goto out_of;
7357         }
7358         /*
7359          * Setup for unordered if needed by looking at the user sent info
7360          * flags.
7361          */
7362         if (sp->sinfo_flags & SCTP_UNORDERED) {
7363                 rcv_flags |= SCTP_DATA_UNORDERED;
7364         }
7365         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7366             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7367                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7368         }
7369         /* clear out the chunk before setting up */
7370         memset(chk, 0, sizeof(*chk));
7371         chk->rec.data.rcv_flags = rcv_flags;
7372
7373         if (to_move >= length) {
7374                 /* we think we can steal the whole thing */
7375                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7376                         SCTP_TCB_SEND_LOCK(stcb);
7377                         send_lock_up = 1;
7378                 }
7379                 if (to_move < sp->length) {
7380                         /* bail, it changed */
7381                         goto dont_do_it;
7382                 }
7383                 chk->data = sp->data;
7384                 chk->last_mbuf = sp->tail_mbuf;
7385                 /* register the stealing */
7386                 sp->data = sp->tail_mbuf = NULL;
7387         } else {
7388                 struct mbuf *m;
7389
7390 dont_do_it:
7391                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7392                 chk->last_mbuf = NULL;
7393                 if (chk->data == NULL) {
7394                         sp->some_taken = some_taken;
7395                         sctp_free_a_chunk(stcb, chk, so_locked);
7396                         *bail = 1;
7397                         to_move = 0;
7398                         goto out_of;
7399                 }
7400 #ifdef SCTP_MBUF_LOGGING
7401                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7402                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7403                 }
7404 #endif
7405                 /* Pull off the data */
7406                 m_adj(sp->data, to_move);
7407                 /* Now lets work our way down and compact it */
7408                 m = sp->data;
7409                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7410                         sp->data = SCTP_BUF_NEXT(m);
7411                         SCTP_BUF_NEXT(m) = NULL;
7412                         if (sp->tail_mbuf == m) {
7413                                 /*-
7414                                  * Freeing tail? TSNH since
7415                                  * we supposedly were taking less
7416                                  * than the sp->length.
7417                                  */
7418 #ifdef INVARIANTS
7419                                 panic("Huh, freing tail? - TSNH");
7420 #else
7421                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7422                                 sp->tail_mbuf = sp->data = NULL;
7423                                 sp->length = 0;
7424 #endif
7425
7426                         }
7427                         sctp_m_free(m);
7428                         m = sp->data;
7429                 }
7430         }
7431         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7432                 chk->copy_by_ref = 1;
7433         } else {
7434                 chk->copy_by_ref = 0;
7435         }
7436         /*
7437          * get last_mbuf and counts of mb usage This is ugly but hopefully
7438          * its only one mbuf.
7439          */
7440         if (chk->last_mbuf == NULL) {
7441                 chk->last_mbuf = chk->data;
7442                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7443                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7444                 }
7445         }
7446         if (to_move > length) {
7447                 /*- This should not happen either
7448                  * since we always lower to_move to the size
7449                  * of sp->length if its larger.
7450                  */
7451 #ifdef INVARIANTS
7452                 panic("Huh, how can to_move be larger?");
7453 #else
7454                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7455                 sp->length = 0;
7456 #endif
7457         } else {
7458                 atomic_subtract_int(&sp->length, to_move);
7459         }
7460         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7461         if (M_LEADINGSPACE(chk->data) < leading) {
7462                 /* Not enough room for a chunk header, get some */
7463                 struct mbuf *m;
7464
7465                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7466                 if (m == NULL) {
7467                         /*
7468                          * we're in trouble here. _PREPEND below will free
7469                          * all the data if there is no leading space, so we
7470                          * must put the data back and restore.
7471                          */
7472                         if (send_lock_up == 0) {
7473                                 SCTP_TCB_SEND_LOCK(stcb);
7474                                 send_lock_up = 1;
7475                         }
7476                         if (sp->data == NULL) {
7477                                 /* unsteal the data */
7478                                 sp->data = chk->data;
7479                                 sp->tail_mbuf = chk->last_mbuf;
7480                         } else {
7481                                 struct mbuf *m_tmp;
7482
7483                                 /* reassemble the data */
7484                                 m_tmp = sp->data;
7485                                 sp->data = chk->data;
7486                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7487                         }
7488                         sp->some_taken = some_taken;
7489                         atomic_add_int(&sp->length, to_move);
7490                         chk->data = NULL;
7491                         *bail = 1;
7492                         sctp_free_a_chunk(stcb, chk, so_locked);
7493                         to_move = 0;
7494                         goto out_of;
7495                 } else {
7496                         SCTP_BUF_LEN(m) = 0;
7497                         SCTP_BUF_NEXT(m) = chk->data;
7498                         chk->data = m;
7499                         M_ALIGN(chk->data, 4);
7500                 }
7501         }
7502         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7503         if (chk->data == NULL) {
7504                 /* HELP, TSNH since we assured it would not above? */
7505 #ifdef INVARIANTS
7506                 panic("prepend failes HELP?");
7507 #else
7508                 SCTP_PRINTF("prepend fails HELP?\n");
7509                 sctp_free_a_chunk(stcb, chk, so_locked);
7510 #endif
7511                 *bail = 1;
7512                 to_move = 0;
7513                 goto out_of;
7514         }
7515         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7516         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7517         chk->book_size_scale = 0;
7518         chk->sent = SCTP_DATAGRAM_UNSENT;
7519
7520         chk->flags = 0;
7521         chk->asoc = &stcb->asoc;
7522         chk->pad_inplace = 0;
7523         chk->no_fr_allowed = 0;
7524         if (stcb->asoc.idata_supported == 0) {
7525                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7526                         /* Just use 0. The receiver ignores the values. */
7527                         chk->rec.data.mid = 0;
7528                 } else {
7529                         chk->rec.data.mid = strq->next_mid_ordered;
7530                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7531                                 strq->next_mid_ordered++;
7532                         }
7533                 }
7534         } else {
7535                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7536                         chk->rec.data.mid = strq->next_mid_unordered;
7537                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7538                                 strq->next_mid_unordered++;
7539                         }
7540                 } else {
7541                         chk->rec.data.mid = strq->next_mid_ordered;
7542                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7543                                 strq->next_mid_ordered++;
7544                         }
7545                 }
7546         }
7547         chk->rec.data.sid = sp->sid;
7548         chk->rec.data.ppid = sp->ppid;
7549         chk->rec.data.context = sp->context;
7550         chk->rec.data.doing_fast_retransmit = 0;
7551
7552         chk->rec.data.timetodrop = sp->ts;
7553         chk->flags = sp->act_flags;
7554
7555         if (sp->net) {
7556                 chk->whoTo = sp->net;
7557                 atomic_add_int(&chk->whoTo->ref_count, 1);
7558         } else
7559                 chk->whoTo = NULL;
7560
7561         if (sp->holds_key_ref) {
7562                 chk->auth_keyid = sp->auth_keyid;
7563                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7564                 chk->holds_key_ref = 1;
7565         }
7566         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7567         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7568                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7569                     (uint32_t)(uintptr_t)stcb, sp->length,
7570                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7571                     chk->rec.data.tsn);
7572         }
7573         if (stcb->asoc.idata_supported == 0) {
7574                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7575         } else {
7576                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7577         }
7578         /*
7579          * Put the rest of the things in place now. Size was done earlier in
7580          * previous loop prior to padding.
7581          */
7582
7583 #ifdef SCTP_ASOCLOG_OF_TSNS
7584         SCTP_TCB_LOCK_ASSERT(stcb);
7585         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7586                 asoc->tsn_out_at = 0;
7587                 asoc->tsn_out_wrapped = 1;
7588         }
7589         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7590         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7591         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7592         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7593         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7594         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7595         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7596         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7597         asoc->tsn_out_at++;
7598 #endif
7599         if (stcb->asoc.idata_supported == 0) {
7600                 dchkh->ch.chunk_type = SCTP_DATA;
7601                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7602                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7603                 dchkh->dp.sid = htons(strq->sid);
7604                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7605                 dchkh->dp.ppid = chk->rec.data.ppid;
7606                 dchkh->ch.chunk_length = htons(chk->send_size);
7607         } else {
7608                 ndchkh->ch.chunk_type = SCTP_IDATA;
7609                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7610                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7611                 ndchkh->dp.sid = htons(strq->sid);
7612                 ndchkh->dp.reserved = htons(0);
7613                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7614                 if (sp->fsn == 0)
7615                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7616                 else
7617                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7618                 sp->fsn++;
7619                 ndchkh->ch.chunk_length = htons(chk->send_size);
7620         }
7621         /* Now advance the chk->send_size by the actual pad needed. */
7622         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7623                 /* need a pad */
7624                 struct mbuf *lm;
7625                 int pads;
7626
7627                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7628                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7629                 if (lm != NULL) {
7630                         chk->last_mbuf = lm;
7631                         chk->pad_inplace = 1;
7632                 }
7633                 chk->send_size += pads;
7634         }
7635         if (PR_SCTP_ENABLED(chk->flags)) {
7636                 asoc->pr_sctp_cnt++;
7637         }
7638         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7639                 /* All done pull and kill the message */
7640                 if (sp->put_last_out == 0) {
7641                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7642                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7643                             sp->sender_all_done,
7644                             sp->length,
7645                             sp->msg_is_complete,
7646                             sp->put_last_out,
7647                             send_lock_up);
7648                 }
7649                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7650                         SCTP_TCB_SEND_LOCK(stcb);
7651                         send_lock_up = 1;
7652                 }
7653                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7654                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7655                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7656                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7657                     (strq->chunks_on_queues == 0) &&
7658                     TAILQ_EMPTY(&strq->outqueue)) {
7659                         stcb->asoc.trigger_reset = 1;
7660                 }
7661                 if (sp->net) {
7662                         sctp_free_remote_addr(sp->net);
7663                         sp->net = NULL;
7664                 }
7665                 if (sp->data) {
7666                         sctp_m_freem(sp->data);
7667                         sp->data = NULL;
7668                 }
7669                 sctp_free_a_strmoq(stcb, sp, so_locked);
7670         }
7671         asoc->chunks_on_out_queue++;
7672         strq->chunks_on_queues++;
7673         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7674         asoc->send_queue_cnt++;
7675 out_of:
7676         if (send_lock_up) {
7677                 SCTP_TCB_SEND_UNLOCK(stcb);
7678         }
7679         return (to_move);
7680 }
7681
7682
7683 static void
7684 sctp_fill_outqueue(struct sctp_tcb *stcb,
7685     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7686 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7687     SCTP_UNUSED
7688 #endif
7689 )
7690 {
7691         struct sctp_association *asoc;
7692         struct sctp_stream_out *strq;
7693         uint32_t space_left, moved, total_moved;
7694         int bail, giveup;
7695
7696         SCTP_TCB_LOCK_ASSERT(stcb);
7697         asoc = &stcb->asoc;
7698         total_moved = 0;
7699         switch (net->ro._l_addr.sa.sa_family) {
7700 #ifdef INET
7701         case AF_INET:
7702                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7703                 break;
7704 #endif
7705 #ifdef INET6
7706         case AF_INET6:
7707                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7708                 break;
7709 #endif
7710         default:
7711                 /* TSNH */
7712                 space_left = net->mtu;
7713                 break;
7714         }
7715         /* Need an allowance for the data chunk header too */
7716         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7717
7718         /* must make even word boundary */
7719         space_left &= 0xfffffffc;
7720         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7721         giveup = 0;
7722         bail = 0;
7723         while ((space_left > 0) && (strq != NULL)) {
7724                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7725                     &giveup, eeor_mode, &bail, so_locked);
7726                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7727                 if ((giveup != 0) || (bail != 0)) {
7728                         break;
7729                 }
7730                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7731                 total_moved += moved;
7732                 space_left -= moved;
7733                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7734                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7735                 } else {
7736                         space_left = 0;
7737                 }
7738                 space_left &= 0xfffffffc;
7739         }
7740         if (bail != 0)
7741                 *quit_now = 1;
7742
7743         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7744
7745         if (total_moved == 0) {
7746                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7747                     (net == stcb->asoc.primary_destination)) {
7748                         /* ran dry for primary network net */
7749                         SCTP_STAT_INCR(sctps_primary_randry);
7750                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7751                         /* ran dry with CMT on */
7752                         SCTP_STAT_INCR(sctps_cmt_randry);
7753                 }
7754         }
7755 }
7756
7757 void
7758 sctp_fix_ecn_echo(struct sctp_association *asoc)
7759 {
7760         struct sctp_tmit_chunk *chk;
7761
7762         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7763                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7764                         chk->sent = SCTP_DATAGRAM_UNSENT;
7765                 }
7766         }
7767 }
7768
7769 void
7770 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7771 {
7772         struct sctp_association *asoc;
7773         struct sctp_tmit_chunk *chk;
7774         struct sctp_stream_queue_pending *sp;
7775         unsigned int i;
7776
7777         if (net == NULL) {
7778                 return;
7779         }
7780         asoc = &stcb->asoc;
7781         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7782                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7783                         if (sp->net == net) {
7784                                 sctp_free_remote_addr(sp->net);
7785                                 sp->net = NULL;
7786                         }
7787                 }
7788         }
7789         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7790                 if (chk->whoTo == net) {
7791                         sctp_free_remote_addr(chk->whoTo);
7792                         chk->whoTo = NULL;
7793                 }
7794         }
7795 }
7796
7797 int
7798 sctp_med_chunk_output(struct sctp_inpcb *inp,
7799     struct sctp_tcb *stcb,
7800     struct sctp_association *asoc,
7801     int *num_out,
7802     int *reason_code,
7803     int control_only, int from_where,
7804     struct timeval *now, int *now_filled, int frag_point, int so_locked
7805 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7806     SCTP_UNUSED
7807 #endif
7808 )
7809 {
7810         /**
7811          * Ok this is the generic chunk service queue. we must do the
7812          * following:
7813          * - Service the stream queue that is next, moving any
7814          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7815          *   LAST to the out queue in one pass) and assigning TSN's. This
7816          *   only applys though if the peer does not support NDATA. For NDATA
7817          *   chunks its ok to not send the entire message ;-)
7818          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7819          *   fomulate and send the low level chunks. Making sure to combine
7820          *   any control in the control chunk queue also.
7821          */
7822         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7823         struct mbuf *outchain, *endoutchain;
7824         struct sctp_tmit_chunk *chk, *nchk;
7825
7826         /* temp arrays for unlinking */
7827         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7828         int no_fragmentflg, error;
7829         unsigned int max_rwnd_per_dest, max_send_per_dest;
7830         int one_chunk, hbflag, skip_data_for_this_net;
7831         int asconf, cookie, no_out_cnt;
7832         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7833         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7834         int tsns_sent = 0;
7835         uint32_t auth_offset = 0;
7836         struct sctp_auth_chunk *auth = NULL;
7837         uint16_t auth_keyid;
7838         int override_ok = 1;
7839         int skip_fill_up = 0;
7840         int data_auth_reqd = 0;
7841
7842         /*
7843          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7844          * destination.
7845          */
7846         int quit_now = 0;
7847
7848         *num_out = 0;
7849         *reason_code = 0;
7850         auth_keyid = stcb->asoc.authinfo.active_keyid;
7851         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7852             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7853             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7854                 eeor_mode = 1;
7855         } else {
7856                 eeor_mode = 0;
7857         }
7858         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7859         /*
7860          * First lets prime the pump. For each destination, if there is room
7861          * in the flight size, attempt to pull an MTU's worth out of the
7862          * stream queues into the general send_queue
7863          */
7864 #ifdef SCTP_AUDITING_ENABLED
7865         sctp_audit_log(0xC2, 2);
7866 #endif
7867         SCTP_TCB_LOCK_ASSERT(stcb);
7868         hbflag = 0;
7869         if (control_only)
7870                 no_data_chunks = 1;
7871         else
7872                 no_data_chunks = 0;
7873
7874         /* Nothing to possible to send? */
7875         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7876             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7877             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7878             TAILQ_EMPTY(&asoc->send_queue) &&
7879             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7880 nothing_to_send:
7881                 *reason_code = 9;
7882                 return (0);
7883         }
7884         if (asoc->peers_rwnd == 0) {
7885                 /* No room in peers rwnd */
7886                 *reason_code = 1;
7887                 if (asoc->total_flight > 0) {
7888                         /* we are allowed one chunk in flight */
7889                         no_data_chunks = 1;
7890                 }
7891         }
7892         if (stcb->asoc.ecn_echo_cnt_onq) {
7893                 /* Record where a sack goes, if any */
7894                 if (no_data_chunks &&
7895                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7896                         /* Nothing but ECNe to send - we don't do that */
7897                         goto nothing_to_send;
7898                 }
7899                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7900                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7901                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7902                                 sack_goes_to = chk->whoTo;
7903                                 break;
7904                         }
7905                 }
7906         }
7907         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7908         if (stcb->sctp_socket)
7909                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7910         else
7911                 max_send_per_dest = 0;
7912         if (no_data_chunks == 0) {
7913                 /* How many non-directed chunks are there? */
7914                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7915                         if (chk->whoTo == NULL) {
7916                                 /*
7917                                  * We already have non-directed chunks on
7918                                  * the queue, no need to do a fill-up.
7919                                  */
7920                                 skip_fill_up = 1;
7921                                 break;
7922                         }
7923                 }
7924
7925         }
7926         if ((no_data_chunks == 0) &&
7927             (skip_fill_up == 0) &&
7928             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7929                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7930                         /*
7931                          * This for loop we are in takes in each net, if
7932                          * its's got space in cwnd and has data sent to it
7933                          * (when CMT is off) then it calls
7934                          * sctp_fill_outqueue for the net. This gets data on
7935                          * the send queue for that network.
7936                          *
7937                          * In sctp_fill_outqueue TSN's are assigned and data
7938                          * is copied out of the stream buffers. Note mostly
7939                          * copy by reference (we hope).
7940                          */
7941                         net->window_probe = 0;
7942                         if ((net != stcb->asoc.alternate) &&
7943                             ((net->dest_state & SCTP_ADDR_PF) ||
7944                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7945                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7946                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7947                                         sctp_log_cwnd(stcb, net, 1,
7948                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7949                                 }
7950                                 continue;
7951                         }
7952                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7953                             (net->flight_size == 0)) {
7954                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7955                         }
7956                         if (net->flight_size >= net->cwnd) {
7957                                 /* skip this network, no room - can't fill */
7958                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7959                                         sctp_log_cwnd(stcb, net, 3,
7960                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7961                                 }
7962                                 continue;
7963                         }
7964                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7965                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7966                         }
7967                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7968                         if (quit_now) {
7969                                 /* memory alloc failure */
7970                                 no_data_chunks = 1;
7971                                 break;
7972                         }
7973                 }
7974         }
7975         /* now service each destination and send out what we can for it */
7976         /* Nothing to send? */
7977         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7978             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7979             TAILQ_EMPTY(&asoc->send_queue)) {
7980                 *reason_code = 8;
7981                 return (0);
7982         }
7983         if (asoc->sctp_cmt_on_off > 0) {
7984                 /* get the last start point */
7985                 start_at = asoc->last_net_cmt_send_started;
7986                 if (start_at == NULL) {
7987                         /* null so to beginning */
7988                         start_at = TAILQ_FIRST(&asoc->nets);
7989                 } else {
7990                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7991                         if (start_at == NULL) {
7992                                 start_at = TAILQ_FIRST(&asoc->nets);
7993                         }
7994                 }
7995                 asoc->last_net_cmt_send_started = start_at;
7996         } else {
7997                 start_at = TAILQ_FIRST(&asoc->nets);
7998         }
7999         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8000                 if (chk->whoTo == NULL) {
8001                         if (asoc->alternate) {
8002                                 chk->whoTo = asoc->alternate;
8003                         } else {
8004                                 chk->whoTo = asoc->primary_destination;
8005                         }
8006                         atomic_add_int(&chk->whoTo->ref_count, 1);
8007                 }
8008         }
8009         old_start_at = NULL;
8010 again_one_more_time:
8011         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8012                 /* how much can we send? */
8013                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8014                 if (old_start_at && (old_start_at == net)) {
8015                         /* through list ocmpletely. */
8016                         break;
8017                 }
8018                 tsns_sent = 0xa;
8019                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8020                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8021                     (net->flight_size >= net->cwnd)) {
8022                         /*
8023                          * Nothing on control or asconf and flight is full,
8024                          * we can skip even in the CMT case.
8025                          */
8026                         continue;
8027                 }
8028                 bundle_at = 0;
8029                 endoutchain = outchain = NULL;
8030                 no_fragmentflg = 1;
8031                 one_chunk = 0;
8032                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8033                         skip_data_for_this_net = 1;
8034                 } else {
8035                         skip_data_for_this_net = 0;
8036                 }
8037                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8038 #ifdef INET
8039                 case AF_INET:
8040                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8041                         break;
8042 #endif
8043 #ifdef INET6
8044                 case AF_INET6:
8045                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8046                         break;
8047 #endif
8048                 default:
8049                         /* TSNH */
8050                         mtu = net->mtu;
8051                         break;
8052                 }
8053                 mx_mtu = mtu;
8054                 to_out = 0;
8055                 if (mtu > asoc->peers_rwnd) {
8056                         if (asoc->total_flight > 0) {
8057                                 /* We have a packet in flight somewhere */
8058                                 r_mtu = asoc->peers_rwnd;
8059                         } else {
8060                                 /* We are always allowed to send one MTU out */
8061                                 one_chunk = 1;
8062                                 r_mtu = mtu;
8063                         }
8064                 } else {
8065                         r_mtu = mtu;
8066                 }
8067                 error = 0;
8068                 /************************/
8069                 /* ASCONF transmission */
8070                 /************************/
8071                 /* Now first lets go through the asconf queue */
8072                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8073                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8074                                 continue;
8075                         }
8076                         if (chk->whoTo == NULL) {
8077                                 if (asoc->alternate == NULL) {
8078                                         if (asoc->primary_destination != net) {
8079                                                 break;
8080                                         }
8081                                 } else {
8082                                         if (asoc->alternate != net) {
8083                                                 break;
8084                                         }
8085                                 }
8086                         } else {
8087                                 if (chk->whoTo != net) {
8088                                         break;
8089                                 }
8090                         }
8091                         if (chk->data == NULL) {
8092                                 break;
8093                         }
8094                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8095                             chk->sent != SCTP_DATAGRAM_RESEND) {
8096                                 break;
8097                         }
8098                         /*
8099                          * if no AUTH is yet included and this chunk
8100                          * requires it, make sure to account for it.  We
8101                          * don't apply the size until the AUTH chunk is
8102                          * actually added below in case there is no room for
8103                          * this chunk. NOTE: we overload the use of "omtu"
8104                          * here
8105                          */
8106                         if ((auth == NULL) &&
8107                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8108                             stcb->asoc.peer_auth_chunks)) {
8109                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8110                         } else
8111                                 omtu = 0;
8112                         /* Here we do NOT factor the r_mtu */
8113                         if ((chk->send_size < (int)(mtu - omtu)) ||
8114                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8115                                 /*
8116                                  * We probably should glom the mbuf chain
8117                                  * from the chk->data for control but the
8118                                  * problem is it becomes yet one more level
8119                                  * of tracking to do if for some reason
8120                                  * output fails. Then I have got to
8121                                  * reconstruct the merged control chain.. el
8122                                  * yucko.. for now we take the easy way and
8123                                  * do the copy
8124                                  */
8125                                 /*
8126                                  * Add an AUTH chunk, if chunk requires it
8127                                  * save the offset into the chain for AUTH
8128                                  */
8129                                 if ((auth == NULL) &&
8130                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8131                                     stcb->asoc.peer_auth_chunks))) {
8132                                         outchain = sctp_add_auth_chunk(outchain,
8133                                             &endoutchain,
8134                                             &auth,
8135                                             &auth_offset,
8136                                             stcb,
8137                                             chk->rec.chunk_id.id);
8138                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8139                                 }
8140                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8141                                     (int)chk->rec.chunk_id.can_take_data,
8142                                     chk->send_size, chk->copy_by_ref);
8143                                 if (outchain == NULL) {
8144                                         *reason_code = 8;
8145                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8146                                         return (ENOMEM);
8147                                 }
8148                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8149                                 /* update our MTU size */
8150                                 if (mtu > (chk->send_size + omtu))
8151                                         mtu -= (chk->send_size + omtu);
8152                                 else
8153                                         mtu = 0;
8154                                 to_out += (chk->send_size + omtu);
8155                                 /* Do clear IP_DF ? */
8156                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8157                                         no_fragmentflg = 0;
8158                                 }
8159                                 if (chk->rec.chunk_id.can_take_data)
8160                                         chk->data = NULL;
8161                                 /*
8162                                  * set hb flag since we can use these for
8163                                  * RTO
8164                                  */
8165                                 hbflag = 1;
8166                                 asconf = 1;
8167                                 /*
8168                                  * should sysctl this: don't bundle data
8169                                  * with ASCONF since it requires AUTH
8170                                  */
8171                                 no_data_chunks = 1;
8172                                 chk->sent = SCTP_DATAGRAM_SENT;
8173                                 if (chk->whoTo == NULL) {
8174                                         chk->whoTo = net;
8175                                         atomic_add_int(&net->ref_count, 1);
8176                                 }
8177                                 chk->snd_count++;
8178                                 if (mtu == 0) {
8179                                         /*
8180                                          * Ok we are out of room but we can
8181                                          * output without effecting the
8182                                          * flight size since this little guy
8183                                          * is a control only packet.
8184                                          */
8185                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8186                                         /*
8187                                          * do NOT clear the asconf flag as
8188                                          * it is used to do appropriate
8189                                          * source address selection.
8190                                          */
8191                                         if (*now_filled == 0) {
8192                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8193                                                 *now_filled = 1;
8194                                         }
8195                                         net->last_sent_time = *now;
8196                                         hbflag = 0;
8197                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8198                                             (struct sockaddr *)&net->ro._l_addr,
8199                                             outchain, auth_offset, auth,
8200                                             stcb->asoc.authinfo.active_keyid,
8201                                             no_fragmentflg, 0, asconf,
8202                                             inp->sctp_lport, stcb->rport,
8203                                             htonl(stcb->asoc.peer_vtag),
8204                                             net->port, NULL,
8205                                             0, 0,
8206                                             so_locked))) {
8207                                                 /*
8208                                                  * error, we could not
8209                                                  * output
8210                                                  */
8211                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8212                                                 if (from_where == 0) {
8213                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8214                                                 }
8215                                                 if (error == ENOBUFS) {
8216                                                         asoc->ifp_had_enobuf = 1;
8217                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8218                                                 }
8219                                                 /* error, could not output */
8220                                                 if (error == EHOSTUNREACH) {
8221                                                         /*
8222                                                          * Destination went
8223                                                          * unreachable
8224                                                          * during this send
8225                                                          */
8226                                                         sctp_move_chunks_from_net(stcb, net);
8227                                                 }
8228                                                 *reason_code = 7;
8229                                                 break;
8230                                         } else {
8231                                                 asoc->ifp_had_enobuf = 0;
8232                                         }
8233                                         /*
8234                                          * increase the number we sent, if a
8235                                          * cookie is sent we don't tell them
8236                                          * any was sent out.
8237                                          */
8238                                         outchain = endoutchain = NULL;
8239                                         auth = NULL;
8240                                         auth_offset = 0;
8241                                         if (!no_out_cnt)
8242                                                 *num_out += ctl_cnt;
8243                                         /* recalc a clean slate and setup */
8244                                         switch (net->ro._l_addr.sa.sa_family) {
8245 #ifdef INET
8246                                         case AF_INET:
8247                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8248                                                 break;
8249 #endif
8250 #ifdef INET6
8251                                         case AF_INET6:
8252                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8253                                                 break;
8254 #endif
8255                                         default:
8256                                                 /* TSNH */
8257                                                 mtu = net->mtu;
8258                                                 break;
8259                                         }
8260                                         to_out = 0;
8261                                         no_fragmentflg = 1;
8262                                 }
8263                         }
8264                 }
8265                 if (error != 0) {
8266                         /* try next net */
8267                         continue;
8268                 }
8269                 /************************/
8270                 /* Control transmission */
8271                 /************************/
8272                 /* Now first lets go through the control queue */
8273                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8274                         if ((sack_goes_to) &&
8275                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8276                             (chk->whoTo != sack_goes_to)) {
8277                                 /*
8278                                  * if we have a sack in queue, and we are
8279                                  * looking at an ecn echo that is NOT queued
8280                                  * to where the sack is going..
8281                                  */
8282                                 if (chk->whoTo == net) {
8283                                         /*
8284                                          * Don't transmit it to where its
8285                                          * going (current net)
8286                                          */
8287                                         continue;
8288                                 } else if (sack_goes_to == net) {
8289                                         /*
8290                                          * But do transmit it to this
8291                                          * address
8292                                          */
8293                                         goto skip_net_check;
8294                                 }
8295                         }
8296                         if (chk->whoTo == NULL) {
8297                                 if (asoc->alternate == NULL) {
8298                                         if (asoc->primary_destination != net) {
8299                                                 continue;
8300                                         }
8301                                 } else {
8302                                         if (asoc->alternate != net) {
8303                                                 continue;
8304                                         }
8305                                 }
8306                         } else {
8307                                 if (chk->whoTo != net) {
8308                                         continue;
8309                                 }
8310                         }
8311         skip_net_check:
8312                         if (chk->data == NULL) {
8313                                 continue;
8314                         }
8315                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8316                                 /*
8317                                  * It must be unsent. Cookies and ASCONF's
8318                                  * hang around but there timers will force
8319                                  * when marked for resend.
8320                                  */
8321                                 continue;
8322                         }
8323                         /*
8324                          * if no AUTH is yet included and this chunk
8325                          * requires it, make sure to account for it.  We
8326                          * don't apply the size until the AUTH chunk is
8327                          * actually added below in case there is no room for
8328                          * this chunk. NOTE: we overload the use of "omtu"
8329                          * here
8330                          */
8331                         if ((auth == NULL) &&
8332                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8333                             stcb->asoc.peer_auth_chunks)) {
8334                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8335                         } else
8336                                 omtu = 0;
8337                         /* Here we do NOT factor the r_mtu */
8338                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8339                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8340                                 /*
8341                                  * We probably should glom the mbuf chain
8342                                  * from the chk->data for control but the
8343                                  * problem is it becomes yet one more level
8344                                  * of tracking to do if for some reason
8345                                  * output fails. Then I have got to
8346                                  * reconstruct the merged control chain.. el
8347                                  * yucko.. for now we take the easy way and
8348                                  * do the copy
8349                                  */
8350                                 /*
8351                                  * Add an AUTH chunk, if chunk requires it
8352                                  * save the offset into the chain for AUTH
8353                                  */
8354                                 if ((auth == NULL) &&
8355                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8356                                     stcb->asoc.peer_auth_chunks))) {
8357                                         outchain = sctp_add_auth_chunk(outchain,
8358                                             &endoutchain,
8359                                             &auth,
8360                                             &auth_offset,
8361                                             stcb,
8362                                             chk->rec.chunk_id.id);
8363                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8364                                 }
8365                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8366                                     (int)chk->rec.chunk_id.can_take_data,
8367                                     chk->send_size, chk->copy_by_ref);
8368                                 if (outchain == NULL) {
8369                                         *reason_code = 8;
8370                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8371                                         return (ENOMEM);
8372                                 }
8373                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8374                                 /* update our MTU size */
8375                                 if (mtu > (chk->send_size + omtu))
8376                                         mtu -= (chk->send_size + omtu);
8377                                 else
8378                                         mtu = 0;
8379                                 to_out += (chk->send_size + omtu);
8380                                 /* Do clear IP_DF ? */
8381                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8382                                         no_fragmentflg = 0;
8383                                 }
8384                                 if (chk->rec.chunk_id.can_take_data)
8385                                         chk->data = NULL;
8386                                 /* Mark things to be removed, if needed */
8387                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8388                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8389                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8390                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8391                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8392                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8393                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8394                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8395                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8396                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8397                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8398                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8399                                                 hbflag = 1;
8400                                         }
8401                                         /* remove these chunks at the end */
8402                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8403                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8404                                                 /* turn off the timer */
8405                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8406                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8407                                                             inp, stcb, net,
8408                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8409                                                 }
8410                                         }
8411                                         ctl_cnt++;
8412                                 } else {
8413                                         /*
8414                                          * Other chunks, since they have
8415                                          * timers running (i.e. COOKIE) we
8416                                          * just "trust" that it gets sent or
8417                                          * retransmitted.
8418                                          */
8419                                         ctl_cnt++;
8420                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8421                                                 cookie = 1;
8422                                                 no_out_cnt = 1;
8423                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8424                                                 /*
8425                                                  * Increment ecne send count
8426                                                  * here this means we may be
8427                                                  * over-zealous in our
8428                                                  * counting if the send
8429                                                  * fails, but its the best
8430                                                  * place to do it (we used
8431                                                  * to do it in the queue of
8432                                                  * the chunk, but that did
8433                                                  * not tell how many times
8434                                                  * it was sent.
8435                                                  */
8436                                                 SCTP_STAT_INCR(sctps_sendecne);
8437                                         }
8438                                         chk->sent = SCTP_DATAGRAM_SENT;
8439                                         if (chk->whoTo == NULL) {
8440                                                 chk->whoTo = net;
8441                                                 atomic_add_int(&net->ref_count, 1);
8442                                         }
8443                                         chk->snd_count++;
8444                                 }
8445                                 if (mtu == 0) {
8446                                         /*
8447                                          * Ok we are out of room but we can
8448                                          * output without effecting the
8449                                          * flight size since this little guy
8450                                          * is a control only packet.
8451                                          */
8452                                         if (asconf) {
8453                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8454                                                 /*
8455                                                  * do NOT clear the asconf
8456                                                  * flag as it is used to do
8457                                                  * appropriate source
8458                                                  * address selection.
8459                                                  */
8460                                         }
8461                                         if (cookie) {
8462                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8463                                                 cookie = 0;
8464                                         }
8465                                         /* Only HB or ASCONF advances time */
8466                                         if (hbflag) {
8467                                                 if (*now_filled == 0) {
8468                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8469                                                         *now_filled = 1;
8470                                                 }
8471                                                 net->last_sent_time = *now;
8472                                                 hbflag = 0;
8473                                         }
8474                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8475                                             (struct sockaddr *)&net->ro._l_addr,
8476                                             outchain,
8477                                             auth_offset, auth,
8478                                             stcb->asoc.authinfo.active_keyid,
8479                                             no_fragmentflg, 0, asconf,
8480                                             inp->sctp_lport, stcb->rport,
8481                                             htonl(stcb->asoc.peer_vtag),
8482                                             net->port, NULL,
8483                                             0, 0,
8484                                             so_locked))) {
8485                                                 /*
8486                                                  * error, we could not
8487                                                  * output
8488                                                  */
8489                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8490                                                 if (from_where == 0) {
8491                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8492                                                 }
8493                                                 if (error == ENOBUFS) {
8494                                                         asoc->ifp_had_enobuf = 1;
8495                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8496                                                 }
8497                                                 if (error == EHOSTUNREACH) {
8498                                                         /*
8499                                                          * Destination went
8500                                                          * unreachable
8501                                                          * during this send
8502                                                          */
8503                                                         sctp_move_chunks_from_net(stcb, net);
8504                                                 }
8505                                                 *reason_code = 7;
8506                                                 break;
8507                                         } else {
8508                                                 asoc->ifp_had_enobuf = 0;
8509                                         }
8510                                         /*
8511                                          * increase the number we sent, if a
8512                                          * cookie is sent we don't tell them
8513                                          * any was sent out.
8514                                          */
8515                                         outchain = endoutchain = NULL;
8516                                         auth = NULL;
8517                                         auth_offset = 0;
8518                                         if (!no_out_cnt)
8519                                                 *num_out += ctl_cnt;
8520                                         /* recalc a clean slate and setup */
8521                                         switch (net->ro._l_addr.sa.sa_family) {
8522 #ifdef INET
8523                                         case AF_INET:
8524                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8525                                                 break;
8526 #endif
8527 #ifdef INET6
8528                                         case AF_INET6:
8529                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8530                                                 break;
8531 #endif
8532                                         default:
8533                                                 /* TSNH */
8534                                                 mtu = net->mtu;
8535                                                 break;
8536                                         }
8537                                         to_out = 0;
8538                                         no_fragmentflg = 1;
8539                                 }
8540                         }
8541                 }
8542                 if (error != 0) {
8543                         /* try next net */
8544                         continue;
8545                 }
8546                 /* JRI: if dest is in PF state, do not send data to it */
8547                 if ((asoc->sctp_cmt_on_off > 0) &&
8548                     (net != stcb->asoc.alternate) &&
8549                     (net->dest_state & SCTP_ADDR_PF)) {
8550                         goto no_data_fill;
8551                 }
8552                 if (net->flight_size >= net->cwnd) {
8553                         goto no_data_fill;
8554                 }
8555                 if ((asoc->sctp_cmt_on_off > 0) &&
8556                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8557                     (net->flight_size > max_rwnd_per_dest)) {
8558                         goto no_data_fill;
8559                 }
8560                 /*
8561                  * We need a specific accounting for the usage of the send
8562                  * buffer. We also need to check the number of messages per
8563                  * net. For now, this is better than nothing and it disabled
8564                  * by default...
8565                  */
8566                 if ((asoc->sctp_cmt_on_off > 0) &&
8567                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8568                     (max_send_per_dest > 0) &&
8569                     (net->flight_size > max_send_per_dest)) {
8570                         goto no_data_fill;
8571                 }
8572                 /*********************/
8573                 /* Data transmission */
8574                 /*********************/
8575                 /*
8576                  * if AUTH for DATA is required and no AUTH has been added
8577                  * yet, account for this in the mtu now... if no data can be
8578                  * bundled, this adjustment won't matter anyways since the
8579                  * packet will be going out...
8580                  */
8581                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8582                     stcb->asoc.peer_auth_chunks);
8583                 if (data_auth_reqd && (auth == NULL)) {
8584                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8585                 }
8586                 /* now lets add any data within the MTU constraints */
8587                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8588 #ifdef INET
8589                 case AF_INET:
8590                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8591                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8592                         else
8593                                 omtu = 0;
8594                         break;
8595 #endif
8596 #ifdef INET6
8597                 case AF_INET6:
8598                         if (net->mtu > SCTP_MIN_OVERHEAD)
8599                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8600                         else
8601                                 omtu = 0;
8602                         break;
8603 #endif
8604                 default:
8605                         /* TSNH */
8606                         omtu = 0;
8607                         break;
8608                 }
8609                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8610                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8611                     (skip_data_for_this_net == 0)) ||
8612                     (cookie)) {
8613                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8614                                 if (no_data_chunks) {
8615                                         /* let only control go out */
8616                                         *reason_code = 1;
8617                                         break;
8618                                 }
8619                                 if (net->flight_size >= net->cwnd) {
8620                                         /* skip this net, no room for data */
8621                                         *reason_code = 2;
8622                                         break;
8623                                 }
8624                                 if ((chk->whoTo != NULL) &&
8625                                     (chk->whoTo != net)) {
8626                                         /* Don't send the chunk on this net */
8627                                         continue;
8628                                 }
8629                                 if (asoc->sctp_cmt_on_off == 0) {
8630                                         if ((asoc->alternate) &&
8631                                             (asoc->alternate != net) &&
8632                                             (chk->whoTo == NULL)) {
8633                                                 continue;
8634                                         } else if ((net != asoc->primary_destination) &&
8635                                                     (asoc->alternate == NULL) &&
8636                                             (chk->whoTo == NULL)) {
8637                                                 continue;
8638                                         }
8639                                 }
8640                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8641                                         /*-
8642                                          * strange, we have a chunk that is
8643                                          * to big for its destination and
8644                                          * yet no fragment ok flag.
8645                                          * Something went wrong when the
8646                                          * PMTU changed...we did not mark
8647                                          * this chunk for some reason?? I
8648                                          * will fix it here by letting IP
8649                                          * fragment it for now and printing
8650                                          * a warning. This really should not
8651                                          * happen ...
8652                                          */
8653                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8654                                             chk->send_size, mtu);
8655                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8656                                 }
8657                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8658                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8659                                         struct sctp_data_chunk *dchkh;
8660
8661                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8662                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8663                                 }
8664                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8665                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8666                                         /* ok we will add this one */
8667
8668                                         /*
8669                                          * Add an AUTH chunk, if chunk
8670                                          * requires it, save the offset into
8671                                          * the chain for AUTH
8672                                          */
8673                                         if (data_auth_reqd) {
8674                                                 if (auth == NULL) {
8675                                                         outchain = sctp_add_auth_chunk(outchain,
8676                                                             &endoutchain,
8677                                                             &auth,
8678                                                             &auth_offset,
8679                                                             stcb,
8680                                                             SCTP_DATA);
8681                                                         auth_keyid = chk->auth_keyid;
8682                                                         override_ok = 0;
8683                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8684                                                 } else if (override_ok) {
8685                                                         /*
8686                                                          * use this data's
8687                                                          * keyid
8688                                                          */
8689                                                         auth_keyid = chk->auth_keyid;
8690                                                         override_ok = 0;
8691                                                 } else if (auth_keyid != chk->auth_keyid) {
8692                                                         /*
8693                                                          * different keyid,
8694                                                          * so done bundling
8695                                                          */
8696                                                         break;
8697                                                 }
8698                                         }
8699                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8700                                             chk->send_size, chk->copy_by_ref);
8701                                         if (outchain == NULL) {
8702                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8703                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8704                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8705                                                 }
8706                                                 *reason_code = 3;
8707                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8708                                                 return (ENOMEM);
8709                                         }
8710                                         /* upate our MTU size */
8711                                         /* Do clear IP_DF ? */
8712                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8713                                                 no_fragmentflg = 0;
8714                                         }
8715                                         /* unsigned subtraction of mtu */
8716                                         if (mtu > chk->send_size)
8717                                                 mtu -= chk->send_size;
8718                                         else
8719                                                 mtu = 0;
8720                                         /* unsigned subtraction of r_mtu */
8721                                         if (r_mtu > chk->send_size)
8722                                                 r_mtu -= chk->send_size;
8723                                         else
8724                                                 r_mtu = 0;
8725
8726                                         to_out += chk->send_size;
8727                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8728 #ifdef INVARIANTS
8729                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8730 #else
8731                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8732                                                     mx_mtu, to_out);
8733 #endif
8734                                         }
8735                                         chk->window_probe = 0;
8736                                         data_list[bundle_at++] = chk;
8737                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8738                                                 break;
8739                                         }
8740                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8741                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8742                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8743                                                 } else {
8744                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8745                                                 }
8746                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8747                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8748                                                         /*
8749                                                          * Count number of
8750                                                          * user msg's that
8751                                                          * were fragmented
8752                                                          * we do this by
8753                                                          * counting when we
8754                                                          * see a LAST
8755                                                          * fragment only.
8756                                                          */
8757                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8758                                         }
8759                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8760                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8761                                                         data_list[0]->window_probe = 1;
8762                                                         net->window_probe = 1;
8763                                                 }
8764                                                 break;
8765                                         }
8766                                 } else {
8767                                         /*
8768                                          * Must be sent in order of the
8769                                          * TSN's (on a network)
8770                                          */
8771                                         break;
8772                                 }
8773                         }       /* for (chunk gather loop for this net) */
8774                 }               /* if asoc.state OPEN */
8775 no_data_fill:
8776                 /* Is there something to send for this destination? */
8777                 if (outchain) {
8778                         /* We may need to start a control timer or two */
8779                         if (asconf) {
8780                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8781                                     stcb, net);
8782                                 /*
8783                                  * do NOT clear the asconf flag as it is
8784                                  * used to do appropriate source address
8785                                  * selection.
8786                                  */
8787                         }
8788                         if (cookie) {
8789                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8790                                 cookie = 0;
8791                         }
8792                         /* must start a send timer if data is being sent */
8793                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8794                                 /*
8795                                  * no timer running on this destination
8796                                  * restart it.
8797                                  */
8798                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8799                         }
8800                         if (bundle_at || hbflag) {
8801                                 /* For data/asconf and hb set time */
8802                                 if (*now_filled == 0) {
8803                                         (void)SCTP_GETTIME_TIMEVAL(now);
8804                                         *now_filled = 1;
8805                                 }
8806                                 net->last_sent_time = *now;
8807                         }
8808                         /* Now send it, if there is anything to send :> */
8809                         if ((error = sctp_lowlevel_chunk_output(inp,
8810                             stcb,
8811                             net,
8812                             (struct sockaddr *)&net->ro._l_addr,
8813                             outchain,
8814                             auth_offset,
8815                             auth,
8816                             auth_keyid,
8817                             no_fragmentflg,
8818                             bundle_at,
8819                             asconf,
8820                             inp->sctp_lport, stcb->rport,
8821                             htonl(stcb->asoc.peer_vtag),
8822                             net->port, NULL,
8823                             0, 0,
8824                             so_locked))) {
8825                                 /* error, we could not output */
8826                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8827                                 if (from_where == 0) {
8828                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8829                                 }
8830                                 if (error == ENOBUFS) {
8831                                         asoc->ifp_had_enobuf = 1;
8832                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8833                                 }
8834                                 if (error == EHOSTUNREACH) {
8835                                         /*
8836                                          * Destination went unreachable
8837                                          * during this send
8838                                          */
8839                                         sctp_move_chunks_from_net(stcb, net);
8840                                 }
8841                                 *reason_code = 6;
8842                                 /*-
8843                                  * I add this line to be paranoid. As far as
8844                                  * I can tell the continue, takes us back to
8845                                  * the top of the for, but just to make sure
8846                                  * I will reset these again here.
8847                                  */
8848                                 ctl_cnt = bundle_at = 0;
8849                                 continue;       /* This takes us back to the
8850                                                  * for() for the nets. */
8851                         } else {
8852                                 asoc->ifp_had_enobuf = 0;
8853                         }
8854                         endoutchain = NULL;
8855                         auth = NULL;
8856                         auth_offset = 0;
8857                         if (!no_out_cnt) {
8858                                 *num_out += (ctl_cnt + bundle_at);
8859                         }
8860                         if (bundle_at) {
8861                                 /* setup for a RTO measurement */
8862                                 tsns_sent = data_list[0]->rec.data.tsn;
8863                                 /* fill time if not already filled */
8864                                 if (*now_filled == 0) {
8865                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8866                                         *now_filled = 1;
8867                                         *now = asoc->time_last_sent;
8868                                 } else {
8869                                         asoc->time_last_sent = *now;
8870                                 }
8871                                 if (net->rto_needed) {
8872                                         data_list[0]->do_rtt = 1;
8873                                         net->rto_needed = 0;
8874                                 }
8875                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8876                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8877                         }
8878                         if (one_chunk) {
8879                                 break;
8880                         }
8881                 }
8882                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8883                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8884                 }
8885         }
8886         if (old_start_at == NULL) {
8887                 old_start_at = start_at;
8888                 start_at = TAILQ_FIRST(&asoc->nets);
8889                 if (old_start_at)
8890                         goto again_one_more_time;
8891         }
8892         /*
8893          * At the end there should be no NON timed chunks hanging on this
8894          * queue.
8895          */
8896         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8897                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8898         }
8899         if ((*num_out == 0) && (*reason_code == 0)) {
8900                 *reason_code = 4;
8901         } else {
8902                 *reason_code = 5;
8903         }
8904         sctp_clean_up_ctl(stcb, asoc, so_locked);
8905         return (0);
8906 }
8907
8908 void
8909 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8910 {
8911         /*-
8912          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8913          * the control chunk queue.
8914          */
8915         struct sctp_chunkhdr *hdr;
8916         struct sctp_tmit_chunk *chk;
8917         struct mbuf *mat, *last_mbuf;
8918         uint32_t chunk_length;
8919         uint16_t padding_length;
8920
8921         SCTP_TCB_LOCK_ASSERT(stcb);
8922         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8923         if (op_err == NULL) {
8924                 return;
8925         }
8926         last_mbuf = NULL;
8927         chunk_length = 0;
8928         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8929                 chunk_length += SCTP_BUF_LEN(mat);
8930                 if (SCTP_BUF_NEXT(mat) == NULL) {
8931                         last_mbuf = mat;
8932                 }
8933         }
8934         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8935                 sctp_m_freem(op_err);
8936                 return;
8937         }
8938         padding_length = chunk_length % 4;
8939         if (padding_length != 0) {
8940                 padding_length = 4 - padding_length;
8941         }
8942         if (padding_length != 0) {
8943                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8944                         sctp_m_freem(op_err);
8945                         return;
8946                 }
8947         }
8948         sctp_alloc_a_chunk(stcb, chk);
8949         if (chk == NULL) {
8950                 /* no memory */
8951                 sctp_m_freem(op_err);
8952                 return;
8953         }
8954         chk->copy_by_ref = 0;
8955         chk->send_size = (uint16_t)chunk_length;
8956         chk->sent = SCTP_DATAGRAM_UNSENT;
8957         chk->snd_count = 0;
8958         chk->asoc = &stcb->asoc;
8959         chk->data = op_err;
8960         chk->whoTo = NULL;
8961         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8962         chk->rec.chunk_id.can_take_data = 0;
8963         hdr = mtod(op_err, struct sctp_chunkhdr *);
8964         hdr->chunk_type = SCTP_OPERATION_ERROR;
8965         hdr->chunk_flags = 0;
8966         hdr->chunk_length = htons(chk->send_size);
8967         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8968         chk->asoc->ctrl_queue_cnt++;
8969 }
8970
8971 int
8972 sctp_send_cookie_echo(struct mbuf *m,
8973     int offset,
8974     struct sctp_tcb *stcb,
8975     struct sctp_nets *net)
8976 {
8977         /*-
8978          * pull out the cookie and put it at the front of the control chunk
8979          * queue.
8980          */
8981         int at;
8982         struct mbuf *cookie;
8983         struct sctp_paramhdr param, *phdr;
8984         struct sctp_chunkhdr *hdr;
8985         struct sctp_tmit_chunk *chk;
8986         uint16_t ptype, plen;
8987
8988         SCTP_TCB_LOCK_ASSERT(stcb);
8989         /* First find the cookie in the param area */
8990         cookie = NULL;
8991         at = offset + sizeof(struct sctp_init_chunk);
8992         for (;;) {
8993                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8994                 if (phdr == NULL) {
8995                         return (-3);
8996                 }
8997                 ptype = ntohs(phdr->param_type);
8998                 plen = ntohs(phdr->param_length);
8999                 if (ptype == SCTP_STATE_COOKIE) {
9000                         int pad;
9001
9002                         /* found the cookie */
9003                         if ((pad = (plen % 4))) {
9004                                 plen += 4 - pad;
9005                         }
9006                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9007                         if (cookie == NULL) {
9008                                 /* No memory */
9009                                 return (-2);
9010                         }
9011 #ifdef SCTP_MBUF_LOGGING
9012                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9013                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9014                         }
9015 #endif
9016                         break;
9017                 }
9018                 at += SCTP_SIZE32(plen);
9019         }
9020         /* ok, we got the cookie lets change it into a cookie echo chunk */
9021         /* first the change from param to cookie */
9022         hdr = mtod(cookie, struct sctp_chunkhdr *);
9023         hdr->chunk_type = SCTP_COOKIE_ECHO;
9024         hdr->chunk_flags = 0;
9025         /* get the chunk stuff now and place it in the FRONT of the queue */
9026         sctp_alloc_a_chunk(stcb, chk);
9027         if (chk == NULL) {
9028                 /* no memory */
9029                 sctp_m_freem(cookie);
9030                 return (-5);
9031         }
9032         chk->copy_by_ref = 0;
9033         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9034         chk->rec.chunk_id.can_take_data = 0;
9035         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9036         chk->send_size = plen;
9037         chk->sent = SCTP_DATAGRAM_UNSENT;
9038         chk->snd_count = 0;
9039         chk->asoc = &stcb->asoc;
9040         chk->data = cookie;
9041         chk->whoTo = net;
9042         atomic_add_int(&chk->whoTo->ref_count, 1);
9043         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9044         chk->asoc->ctrl_queue_cnt++;
9045         return (0);
9046 }
9047
9048 void
9049 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9050     struct mbuf *m,
9051     int offset,
9052     int chk_length,
9053     struct sctp_nets *net)
9054 {
9055         /*
9056          * take a HB request and make it into a HB ack and send it.
9057          */
9058         struct mbuf *outchain;
9059         struct sctp_chunkhdr *chdr;
9060         struct sctp_tmit_chunk *chk;
9061
9062
9063         if (net == NULL)
9064                 /* must have a net pointer */
9065                 return;
9066
9067         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9068         if (outchain == NULL) {
9069                 /* gak out of memory */
9070                 return;
9071         }
9072 #ifdef SCTP_MBUF_LOGGING
9073         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9074                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9075         }
9076 #endif
9077         chdr = mtod(outchain, struct sctp_chunkhdr *);
9078         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9079         chdr->chunk_flags = 0;
9080         if (chk_length % 4) {
9081                 /* need pad */
9082                 uint32_t cpthis = 0;
9083                 int padlen;
9084
9085                 padlen = 4 - (chk_length % 4);
9086                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9087         }
9088         sctp_alloc_a_chunk(stcb, chk);
9089         if (chk == NULL) {
9090                 /* no memory */
9091                 sctp_m_freem(outchain);
9092                 return;
9093         }
9094         chk->copy_by_ref = 0;
9095         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9096         chk->rec.chunk_id.can_take_data = 1;
9097         chk->flags = 0;
9098         chk->send_size = chk_length;
9099         chk->sent = SCTP_DATAGRAM_UNSENT;
9100         chk->snd_count = 0;
9101         chk->asoc = &stcb->asoc;
9102         chk->data = outchain;
9103         chk->whoTo = net;
9104         atomic_add_int(&chk->whoTo->ref_count, 1);
9105         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9106         chk->asoc->ctrl_queue_cnt++;
9107 }
9108
9109 void
9110 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9111 {
9112         /* formulate and queue a cookie-ack back to sender */
9113         struct mbuf *cookie_ack;
9114         struct sctp_chunkhdr *hdr;
9115         struct sctp_tmit_chunk *chk;
9116
9117         SCTP_TCB_LOCK_ASSERT(stcb);
9118
9119         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9120         if (cookie_ack == NULL) {
9121                 /* no mbuf's */
9122                 return;
9123         }
9124         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9125         sctp_alloc_a_chunk(stcb, chk);
9126         if (chk == NULL) {
9127                 /* no memory */
9128                 sctp_m_freem(cookie_ack);
9129                 return;
9130         }
9131         chk->copy_by_ref = 0;
9132         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9133         chk->rec.chunk_id.can_take_data = 1;
9134         chk->flags = 0;
9135         chk->send_size = sizeof(struct sctp_chunkhdr);
9136         chk->sent = SCTP_DATAGRAM_UNSENT;
9137         chk->snd_count = 0;
9138         chk->asoc = &stcb->asoc;
9139         chk->data = cookie_ack;
9140         if (chk->asoc->last_control_chunk_from != NULL) {
9141                 chk->whoTo = chk->asoc->last_control_chunk_from;
9142                 atomic_add_int(&chk->whoTo->ref_count, 1);
9143         } else {
9144                 chk->whoTo = NULL;
9145         }
9146         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9147         hdr->chunk_type = SCTP_COOKIE_ACK;
9148         hdr->chunk_flags = 0;
9149         hdr->chunk_length = htons(chk->send_size);
9150         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9151         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9152         chk->asoc->ctrl_queue_cnt++;
9153         return;
9154 }
9155
9156
9157 void
9158 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9159 {
9160         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9161         struct mbuf *m_shutdown_ack;
9162         struct sctp_shutdown_ack_chunk *ack_cp;
9163         struct sctp_tmit_chunk *chk;
9164
9165         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9166         if (m_shutdown_ack == NULL) {
9167                 /* no mbuf's */
9168                 return;
9169         }
9170         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9171         sctp_alloc_a_chunk(stcb, chk);
9172         if (chk == NULL) {
9173                 /* no memory */
9174                 sctp_m_freem(m_shutdown_ack);
9175                 return;
9176         }
9177         chk->copy_by_ref = 0;
9178         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9179         chk->rec.chunk_id.can_take_data = 1;
9180         chk->flags = 0;
9181         chk->send_size = sizeof(struct sctp_chunkhdr);
9182         chk->sent = SCTP_DATAGRAM_UNSENT;
9183         chk->snd_count = 0;
9184         chk->flags = 0;
9185         chk->asoc = &stcb->asoc;
9186         chk->data = m_shutdown_ack;
9187         chk->whoTo = net;
9188         if (chk->whoTo) {
9189                 atomic_add_int(&chk->whoTo->ref_count, 1);
9190         }
9191         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9192         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9193         ack_cp->ch.chunk_flags = 0;
9194         ack_cp->ch.chunk_length = htons(chk->send_size);
9195         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9196         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9197         chk->asoc->ctrl_queue_cnt++;
9198         return;
9199 }
9200
9201 void
9202 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9203 {
9204         /* formulate and queue a SHUTDOWN to the sender */
9205         struct mbuf *m_shutdown;
9206         struct sctp_shutdown_chunk *shutdown_cp;
9207         struct sctp_tmit_chunk *chk;
9208
9209         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9210                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9211                         /* We already have a SHUTDOWN queued. Reuse it. */
9212                         if (chk->whoTo) {
9213                                 sctp_free_remote_addr(chk->whoTo);
9214                                 chk->whoTo = NULL;
9215                         }
9216                         break;
9217                 }
9218         }
9219         if (chk == NULL) {
9220                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9221                 if (m_shutdown == NULL) {
9222                         /* no mbuf's */
9223                         return;
9224                 }
9225                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9226                 sctp_alloc_a_chunk(stcb, chk);
9227                 if (chk == NULL) {
9228                         /* no memory */
9229                         sctp_m_freem(m_shutdown);
9230                         return;
9231                 }
9232                 chk->copy_by_ref = 0;
9233                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9234                 chk->rec.chunk_id.can_take_data = 1;
9235                 chk->flags = 0;
9236                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9237                 chk->sent = SCTP_DATAGRAM_UNSENT;
9238                 chk->snd_count = 0;
9239                 chk->flags = 0;
9240                 chk->asoc = &stcb->asoc;
9241                 chk->data = m_shutdown;
9242                 chk->whoTo = net;
9243                 if (chk->whoTo) {
9244                         atomic_add_int(&chk->whoTo->ref_count, 1);
9245                 }
9246                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9247                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9248                 shutdown_cp->ch.chunk_flags = 0;
9249                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9250                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9251                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9252                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9253                 chk->asoc->ctrl_queue_cnt++;
9254         } else {
9255                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9256                 chk->whoTo = net;
9257                 if (chk->whoTo) {
9258                         atomic_add_int(&chk->whoTo->ref_count, 1);
9259                 }
9260                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9261                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9262                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9263         }
9264         return;
9265 }
9266
9267 void
9268 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9269 {
9270         /*
9271          * formulate and queue an ASCONF to the peer. ASCONF parameters
9272          * should be queued on the assoc queue.
9273          */
9274         struct sctp_tmit_chunk *chk;
9275         struct mbuf *m_asconf;
9276         int len;
9277
9278         SCTP_TCB_LOCK_ASSERT(stcb);
9279
9280         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9281             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9282                 /* can't send a new one if there is one in flight already */
9283                 return;
9284         }
9285         /* compose an ASCONF chunk, maximum length is PMTU */
9286         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9287         if (m_asconf == NULL) {
9288                 return;
9289         }
9290         sctp_alloc_a_chunk(stcb, chk);
9291         if (chk == NULL) {
9292                 /* no memory */
9293                 sctp_m_freem(m_asconf);
9294                 return;
9295         }
9296         chk->copy_by_ref = 0;
9297         chk->rec.chunk_id.id = SCTP_ASCONF;
9298         chk->rec.chunk_id.can_take_data = 0;
9299         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9300         chk->data = m_asconf;
9301         chk->send_size = len;
9302         chk->sent = SCTP_DATAGRAM_UNSENT;
9303         chk->snd_count = 0;
9304         chk->asoc = &stcb->asoc;
9305         chk->whoTo = net;
9306         if (chk->whoTo) {
9307                 atomic_add_int(&chk->whoTo->ref_count, 1);
9308         }
9309         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9310         chk->asoc->ctrl_queue_cnt++;
9311         return;
9312 }
9313
9314 void
9315 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9316 {
9317         /*
9318          * formulate and queue a asconf-ack back to sender. the asconf-ack
9319          * must be stored in the tcb.
9320          */
9321         struct sctp_tmit_chunk *chk;
9322         struct sctp_asconf_ack *ack, *latest_ack;
9323         struct mbuf *m_ack;
9324         struct sctp_nets *net = NULL;
9325
9326         SCTP_TCB_LOCK_ASSERT(stcb);
9327         /* Get the latest ASCONF-ACK */
9328         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9329         if (latest_ack == NULL) {
9330                 return;
9331         }
9332         if (latest_ack->last_sent_to != NULL &&
9333             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9334                 /* we're doing a retransmission */
9335                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9336                 if (net == NULL) {
9337                         /* no alternate */
9338                         if (stcb->asoc.last_control_chunk_from == NULL) {
9339                                 if (stcb->asoc.alternate) {
9340                                         net = stcb->asoc.alternate;
9341                                 } else {
9342                                         net = stcb->asoc.primary_destination;
9343                                 }
9344                         } else {
9345                                 net = stcb->asoc.last_control_chunk_from;
9346                         }
9347                 }
9348         } else {
9349                 /* normal case */
9350                 if (stcb->asoc.last_control_chunk_from == NULL) {
9351                         if (stcb->asoc.alternate) {
9352                                 net = stcb->asoc.alternate;
9353                         } else {
9354                                 net = stcb->asoc.primary_destination;
9355                         }
9356                 } else {
9357                         net = stcb->asoc.last_control_chunk_from;
9358                 }
9359         }
9360         latest_ack->last_sent_to = net;
9361
9362         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9363                 if (ack->data == NULL) {
9364                         continue;
9365                 }
9366                 /* copy the asconf_ack */
9367                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9368                 if (m_ack == NULL) {
9369                         /* couldn't copy it */
9370                         return;
9371                 }
9372 #ifdef SCTP_MBUF_LOGGING
9373                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9374                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9375                 }
9376 #endif
9377
9378                 sctp_alloc_a_chunk(stcb, chk);
9379                 if (chk == NULL) {
9380                         /* no memory */
9381                         if (m_ack)
9382                                 sctp_m_freem(m_ack);
9383                         return;
9384                 }
9385                 chk->copy_by_ref = 0;
9386                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9387                 chk->rec.chunk_id.can_take_data = 1;
9388                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9389                 chk->whoTo = net;
9390                 if (chk->whoTo) {
9391                         atomic_add_int(&chk->whoTo->ref_count, 1);
9392                 }
9393                 chk->data = m_ack;
9394                 chk->send_size = ack->len;
9395                 chk->sent = SCTP_DATAGRAM_UNSENT;
9396                 chk->snd_count = 0;
9397                 chk->asoc = &stcb->asoc;
9398
9399                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9400                 chk->asoc->ctrl_queue_cnt++;
9401         }
9402         return;
9403 }
9404
9405
9406 static int
9407 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9408     struct sctp_tcb *stcb,
9409     struct sctp_association *asoc,
9410     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9411 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9412     SCTP_UNUSED
9413 #endif
9414 )
9415 {
9416         /*-
9417          * send out one MTU of retransmission. If fast_retransmit is
9418          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9419          * rwnd. For a Cookie or Asconf in the control chunk queue we
9420          * retransmit them by themselves.
9421          *
9422          * For data chunks we will pick out the lowest TSN's in the sent_queue
9423          * marked for resend and bundle them all together (up to a MTU of
9424          * destination). The address to send to should have been
9425          * selected/changed where the retransmission was marked (i.e. in FR
9426          * or t3-timeout routines).
9427          */
9428         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9429         struct sctp_tmit_chunk *chk, *fwd;
9430         struct mbuf *m, *endofchain;
9431         struct sctp_nets *net = NULL;
9432         uint32_t tsns_sent = 0;
9433         int no_fragmentflg, bundle_at, cnt_thru;
9434         unsigned int mtu;
9435         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9436         struct sctp_auth_chunk *auth = NULL;
9437         uint32_t auth_offset = 0;
9438         uint16_t auth_keyid;
9439         int override_ok = 1;
9440         int data_auth_reqd = 0;
9441         uint32_t dmtu = 0;
9442
9443         SCTP_TCB_LOCK_ASSERT(stcb);
9444         tmr_started = ctl_cnt = bundle_at = error = 0;
9445         no_fragmentflg = 1;
9446         fwd_tsn = 0;
9447         *cnt_out = 0;
9448         fwd = NULL;
9449         endofchain = m = NULL;
9450         auth_keyid = stcb->asoc.authinfo.active_keyid;
9451 #ifdef SCTP_AUDITING_ENABLED
9452         sctp_audit_log(0xC3, 1);
9453 #endif
9454         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9455             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9456                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9457                     asoc->sent_queue_retran_cnt);
9458                 asoc->sent_queue_cnt = 0;
9459                 asoc->sent_queue_cnt_removeable = 0;
9460                 /* send back 0/0 so we enter normal transmission */
9461                 *cnt_out = 0;
9462                 return (0);
9463         }
9464         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9465                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9466                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9467                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9468                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9469                                 continue;
9470                         }
9471                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9472                                 if (chk != asoc->str_reset) {
9473                                         /*
9474                                          * not eligible for retran if its
9475                                          * not ours
9476                                          */
9477                                         continue;
9478                                 }
9479                         }
9480                         ctl_cnt++;
9481                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9482                                 fwd_tsn = 1;
9483                         }
9484                         /*
9485                          * Add an AUTH chunk, if chunk requires it save the
9486                          * offset into the chain for AUTH
9487                          */
9488                         if ((auth == NULL) &&
9489                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9490                             stcb->asoc.peer_auth_chunks))) {
9491                                 m = sctp_add_auth_chunk(m, &endofchain,
9492                                     &auth, &auth_offset,
9493                                     stcb,
9494                                     chk->rec.chunk_id.id);
9495                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9496                         }
9497                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9498                         break;
9499                 }
9500         }
9501         one_chunk = 0;
9502         cnt_thru = 0;
9503         /* do we have control chunks to retransmit? */
9504         if (m != NULL) {
9505                 /* Start a timer no matter if we succeed or fail */
9506                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9507                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9508                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9509                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9510                 chk->snd_count++;       /* update our count */
9511                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9512                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9513                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9514                     no_fragmentflg, 0, 0,
9515                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9516                     chk->whoTo->port, NULL,
9517                     0, 0,
9518                     so_locked))) {
9519                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9520                         if (error == ENOBUFS) {
9521                                 asoc->ifp_had_enobuf = 1;
9522                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9523                         }
9524                         return (error);
9525                 } else {
9526                         asoc->ifp_had_enobuf = 0;
9527                 }
9528                 endofchain = NULL;
9529                 auth = NULL;
9530                 auth_offset = 0;
9531                 /*
9532                  * We don't want to mark the net->sent time here since this
9533                  * we use this for HB and retrans cannot measure RTT
9534                  */
9535                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9536                 *cnt_out += 1;
9537                 chk->sent = SCTP_DATAGRAM_SENT;
9538                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9539                 if (fwd_tsn == 0) {
9540                         return (0);
9541                 } else {
9542                         /* Clean up the fwd-tsn list */
9543                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9544                         return (0);
9545                 }
9546         }
9547         /*
9548          * Ok, it is just data retransmission we need to do or that and a
9549          * fwd-tsn with it all.
9550          */
9551         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9552                 return (SCTP_RETRAN_DONE);
9553         }
9554         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9555             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9556                 /* not yet open, resend the cookie and that is it */
9557                 return (1);
9558         }
9559 #ifdef SCTP_AUDITING_ENABLED
9560         sctp_auditing(20, inp, stcb, NULL);
9561 #endif
9562         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9563         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9564                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9565                         /* No, not sent to this net or not ready for rtx */
9566                         continue;
9567                 }
9568                 if (chk->data == NULL) {
9569                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9570                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9571                         continue;
9572                 }
9573                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9574                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9575                         struct mbuf *op_err;
9576                         char msg[SCTP_DIAG_INFO_LEN];
9577
9578                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9579                             chk->rec.data.tsn, chk->snd_count);
9580                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9581                             msg);
9582                         atomic_add_int(&stcb->asoc.refcnt, 1);
9583                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9584                             so_locked);
9585                         SCTP_TCB_LOCK(stcb);
9586                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9587                         return (SCTP_RETRAN_EXIT);
9588                 }
9589                 /* pick up the net */
9590                 net = chk->whoTo;
9591                 switch (net->ro._l_addr.sa.sa_family) {
9592 #ifdef INET
9593                 case AF_INET:
9594                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9595                         break;
9596 #endif
9597 #ifdef INET6
9598                 case AF_INET6:
9599                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9600                         break;
9601 #endif
9602                 default:
9603                         /* TSNH */
9604                         mtu = net->mtu;
9605                         break;
9606                 }
9607
9608                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9609                         /* No room in peers rwnd */
9610                         uint32_t tsn;
9611
9612                         tsn = asoc->last_acked_seq + 1;
9613                         if (tsn == chk->rec.data.tsn) {
9614                                 /*
9615                                  * we make a special exception for this
9616                                  * case. The peer has no rwnd but is missing
9617                                  * the lowest chunk.. which is probably what
9618                                  * is holding up the rwnd.
9619                                  */
9620                                 goto one_chunk_around;
9621                         }
9622                         return (1);
9623                 }
9624 one_chunk_around:
9625                 if (asoc->peers_rwnd < mtu) {
9626                         one_chunk = 1;
9627                         if ((asoc->peers_rwnd == 0) &&
9628                             (asoc->total_flight == 0)) {
9629                                 chk->window_probe = 1;
9630                                 chk->whoTo->window_probe = 1;
9631                         }
9632                 }
9633 #ifdef SCTP_AUDITING_ENABLED
9634                 sctp_audit_log(0xC3, 2);
9635 #endif
9636                 bundle_at = 0;
9637                 m = NULL;
9638                 net->fast_retran_ip = 0;
9639                 if (chk->rec.data.doing_fast_retransmit == 0) {
9640                         /*
9641                          * if no FR in progress skip destination that have
9642                          * flight_size > cwnd.
9643                          */
9644                         if (net->flight_size >= net->cwnd) {
9645                                 continue;
9646                         }
9647                 } else {
9648                         /*
9649                          * Mark the destination net to have FR recovery
9650                          * limits put on it.
9651                          */
9652                         *fr_done = 1;
9653                         net->fast_retran_ip = 1;
9654                 }
9655
9656                 /*
9657                  * if no AUTH is yet included and this chunk requires it,
9658                  * make sure to account for it.  We don't apply the size
9659                  * until the AUTH chunk is actually added below in case
9660                  * there is no room for this chunk.
9661                  */
9662                 if (data_auth_reqd && (auth == NULL)) {
9663                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9664                 } else
9665                         dmtu = 0;
9666
9667                 if ((chk->send_size <= (mtu - dmtu)) ||
9668                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9669                         /* ok we will add this one */
9670                         if (data_auth_reqd) {
9671                                 if (auth == NULL) {
9672                                         m = sctp_add_auth_chunk(m,
9673                                             &endofchain,
9674                                             &auth,
9675                                             &auth_offset,
9676                                             stcb,
9677                                             SCTP_DATA);
9678                                         auth_keyid = chk->auth_keyid;
9679                                         override_ok = 0;
9680                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9681                                 } else if (override_ok) {
9682                                         auth_keyid = chk->auth_keyid;
9683                                         override_ok = 0;
9684                                 } else if (chk->auth_keyid != auth_keyid) {
9685                                         /* different keyid, so done bundling */
9686                                         break;
9687                                 }
9688                         }
9689                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9690                         if (m == NULL) {
9691                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9692                                 return (ENOMEM);
9693                         }
9694                         /* Do clear IP_DF ? */
9695                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9696                                 no_fragmentflg = 0;
9697                         }
9698                         /* upate our MTU size */
9699                         if (mtu > (chk->send_size + dmtu))
9700                                 mtu -= (chk->send_size + dmtu);
9701                         else
9702                                 mtu = 0;
9703                         data_list[bundle_at++] = chk;
9704                         if (one_chunk && (asoc->total_flight <= 0)) {
9705                                 SCTP_STAT_INCR(sctps_windowprobed);
9706                         }
9707                 }
9708                 if (one_chunk == 0) {
9709                         /*
9710                          * now are there anymore forward from chk to pick
9711                          * up?
9712                          */
9713                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9714                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9715                                         /* Nope, not for retran */
9716                                         continue;
9717                                 }
9718                                 if (fwd->whoTo != net) {
9719                                         /* Nope, not the net in question */
9720                                         continue;
9721                                 }
9722                                 if (data_auth_reqd && (auth == NULL)) {
9723                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9724                                 } else
9725                                         dmtu = 0;
9726                                 if (fwd->send_size <= (mtu - dmtu)) {
9727                                         if (data_auth_reqd) {
9728                                                 if (auth == NULL) {
9729                                                         m = sctp_add_auth_chunk(m,
9730                                                             &endofchain,
9731                                                             &auth,
9732                                                             &auth_offset,
9733                                                             stcb,
9734                                                             SCTP_DATA);
9735                                                         auth_keyid = fwd->auth_keyid;
9736                                                         override_ok = 0;
9737                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9738                                                 } else if (override_ok) {
9739                                                         auth_keyid = fwd->auth_keyid;
9740                                                         override_ok = 0;
9741                                                 } else if (fwd->auth_keyid != auth_keyid) {
9742                                                         /*
9743                                                          * different keyid,
9744                                                          * so done bundling
9745                                                          */
9746                                                         break;
9747                                                 }
9748                                         }
9749                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9750                                         if (m == NULL) {
9751                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9752                                                 return (ENOMEM);
9753                                         }
9754                                         /* Do clear IP_DF ? */
9755                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9756                                                 no_fragmentflg = 0;
9757                                         }
9758                                         /* upate our MTU size */
9759                                         if (mtu > (fwd->send_size + dmtu))
9760                                                 mtu -= (fwd->send_size + dmtu);
9761                                         else
9762                                                 mtu = 0;
9763                                         data_list[bundle_at++] = fwd;
9764                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9765                                                 break;
9766                                         }
9767                                 } else {
9768                                         /* can't fit so we are done */
9769                                         break;
9770                                 }
9771                         }
9772                 }
9773                 /* Is there something to send for this destination? */
9774                 if (m) {
9775                         /*
9776                          * No matter if we fail/or succeed we should start a
9777                          * timer. A failure is like a lost IP packet :-)
9778                          */
9779                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9780                                 /*
9781                                  * no timer running on this destination
9782                                  * restart it.
9783                                  */
9784                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9785                                 tmr_started = 1;
9786                         }
9787                         /* Now lets send it, if there is anything to send :> */
9788                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9789                             (struct sockaddr *)&net->ro._l_addr, m,
9790                             auth_offset, auth, auth_keyid,
9791                             no_fragmentflg, 0, 0,
9792                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9793                             net->port, NULL,
9794                             0, 0,
9795                             so_locked))) {
9796                                 /* error, we could not output */
9797                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9798                                 if (error == ENOBUFS) {
9799                                         asoc->ifp_had_enobuf = 1;
9800                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9801                                 }
9802                                 return (error);
9803                         } else {
9804                                 asoc->ifp_had_enobuf = 0;
9805                         }
9806                         endofchain = NULL;
9807                         auth = NULL;
9808                         auth_offset = 0;
9809                         /* For HB's */
9810                         /*
9811                          * We don't want to mark the net->sent time here
9812                          * since this we use this for HB and retrans cannot
9813                          * measure RTT
9814                          */
9815                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9816
9817                         /* For auto-close */
9818                         cnt_thru++;
9819                         if (*now_filled == 0) {
9820                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9821                                 *now = asoc->time_last_sent;
9822                                 *now_filled = 1;
9823                         } else {
9824                                 asoc->time_last_sent = *now;
9825                         }
9826                         *cnt_out += bundle_at;
9827 #ifdef SCTP_AUDITING_ENABLED
9828                         sctp_audit_log(0xC4, bundle_at);
9829 #endif
9830                         if (bundle_at) {
9831                                 tsns_sent = data_list[0]->rec.data.tsn;
9832                         }
9833                         for (i = 0; i < bundle_at; i++) {
9834                                 SCTP_STAT_INCR(sctps_sendretransdata);
9835                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9836                                 /*
9837                                  * When we have a revoked data, and we
9838                                  * retransmit it, then we clear the revoked
9839                                  * flag since this flag dictates if we
9840                                  * subtracted from the fs
9841                                  */
9842                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9843                                         /* Deflate the cwnd */
9844                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9845                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9846                                 }
9847                                 data_list[i]->snd_count++;
9848                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9849                                 /* record the time */
9850                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9851                                 if (data_list[i]->book_size_scale) {
9852                                         /*
9853                                          * need to double the book size on
9854                                          * this one
9855                                          */
9856                                         data_list[i]->book_size_scale = 0;
9857                                         /*
9858                                          * Since we double the booksize, we
9859                                          * must also double the output queue
9860                                          * size, since this get shrunk when
9861                                          * we free by this amount.
9862                                          */
9863                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9864                                         data_list[i]->book_size *= 2;
9865
9866
9867                                 } else {
9868                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9869                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9870                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9871                                         }
9872                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9873                                             (uint32_t)(data_list[i]->send_size +
9874                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9875                                 }
9876                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9877                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9878                                             data_list[i]->whoTo->flight_size,
9879                                             data_list[i]->book_size,
9880                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9881                                             data_list[i]->rec.data.tsn);
9882                                 }
9883                                 sctp_flight_size_increase(data_list[i]);
9884                                 sctp_total_flight_increase(stcb, data_list[i]);
9885                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9886                                         /* SWS sender side engages */
9887                                         asoc->peers_rwnd = 0;
9888                                 }
9889                                 if ((i == 0) &&
9890                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9891                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9892                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9893                                             (tmr_started == 0)) {
9894                                                 /*-
9895                                                  * ok we just fast-retrans'd
9896                                                  * the lowest TSN, i.e the
9897                                                  * first on the list. In
9898                                                  * this case we want to give
9899                                                  * some more time to get a
9900                                                  * SACK back without a
9901                                                  * t3-expiring.
9902                                                  */
9903                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9904                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9905                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9906                                         }
9907                                 }
9908                         }
9909                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9910                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9911                         }
9912 #ifdef SCTP_AUDITING_ENABLED
9913                         sctp_auditing(21, inp, stcb, NULL);
9914 #endif
9915                 } else {
9916                         /* None will fit */
9917                         return (1);
9918                 }
9919                 if (asoc->sent_queue_retran_cnt <= 0) {
9920                         /* all done we have no more to retran */
9921                         asoc->sent_queue_retran_cnt = 0;
9922                         break;
9923                 }
9924                 if (one_chunk) {
9925                         /* No more room in rwnd */
9926                         return (1);
9927                 }
9928                 /* stop the for loop here. we sent out a packet */
9929                 break;
9930         }
9931         return (0);
9932 }
9933
9934 static void
9935 sctp_timer_validation(struct sctp_inpcb *inp,
9936     struct sctp_tcb *stcb,
9937     struct sctp_association *asoc)
9938 {
9939         struct sctp_nets *net;
9940
9941         /* Validate that a timer is running somewhere */
9942         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9943                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9944                         /* Here is a timer */
9945                         return;
9946                 }
9947         }
9948         SCTP_TCB_LOCK_ASSERT(stcb);
9949         /* Gak, we did not have a timer somewhere */
9950         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9951         if (asoc->alternate) {
9952                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9953         } else {
9954                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9955         }
9956         return;
9957 }
9958
9959 void
9960 sctp_chunk_output(struct sctp_inpcb *inp,
9961     struct sctp_tcb *stcb,
9962     int from_where,
9963     int so_locked
9964 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9965     SCTP_UNUSED
9966 #endif
9967 )
9968 {
9969         /*-
9970          * Ok this is the generic chunk service queue. we must do the
9971          * following:
9972          * - See if there are retransmits pending, if so we must
9973          *   do these first.
9974          * - Service the stream queue that is next, moving any
9975          *   message (note I must get a complete message i.e.
9976          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9977          *   TSN's
9978          * - Check to see if the cwnd/rwnd allows any output, if so we
9979          *   go ahead and fomulate and send the low level chunks. Making sure
9980          *   to combine any control in the control chunk queue also.
9981          */
9982         struct sctp_association *asoc;
9983         struct sctp_nets *net;
9984         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9985         unsigned int burst_cnt = 0;
9986         struct timeval now;
9987         int now_filled = 0;
9988         int nagle_on;
9989         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9990         int un_sent = 0;
9991         int fr_done;
9992         unsigned int tot_frs = 0;
9993
9994         asoc = &stcb->asoc;
9995 do_it_again:
9996         /* The Nagle algorithm is only applied when handling a send call. */
9997         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9998                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9999                         nagle_on = 0;
10000                 } else {
10001                         nagle_on = 1;
10002                 }
10003         } else {
10004                 nagle_on = 0;
10005         }
10006         SCTP_TCB_LOCK_ASSERT(stcb);
10007
10008         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10009
10010         if ((un_sent <= 0) &&
10011             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10012             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10013             (asoc->sent_queue_retran_cnt == 0) &&
10014             (asoc->trigger_reset == 0)) {
10015                 /* Nothing to do unless there is something to be sent left */
10016                 return;
10017         }
10018         /*
10019          * Do we have something to send, data or control AND a sack timer
10020          * running, if so piggy-back the sack.
10021          */
10022         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10023                 sctp_send_sack(stcb, so_locked);
10024                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10025         }
10026         while (asoc->sent_queue_retran_cnt) {
10027                 /*-
10028                  * Ok, it is retransmission time only, we send out only ONE
10029                  * packet with a single call off to the retran code.
10030                  */
10031                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10032                         /*-
10033                          * Special hook for handling cookiess discarded
10034                          * by peer that carried data. Send cookie-ack only
10035                          * and then the next call with get the retran's.
10036                          */
10037                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10038                             from_where,
10039                             &now, &now_filled, frag_point, so_locked);
10040                         return;
10041                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10042                         /* if its not from a HB then do it */
10043                         fr_done = 0;
10044                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10045                         if (fr_done) {
10046                                 tot_frs++;
10047                         }
10048                 } else {
10049                         /*
10050                          * its from any other place, we don't allow retran
10051                          * output (only control)
10052                          */
10053                         ret = 1;
10054                 }
10055                 if (ret > 0) {
10056                         /* Can't send anymore */
10057                         /*-
10058                          * now lets push out control by calling med-level
10059                          * output once. this assures that we WILL send HB's
10060                          * if queued too.
10061                          */
10062                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10063                             from_where,
10064                             &now, &now_filled, frag_point, so_locked);
10065 #ifdef SCTP_AUDITING_ENABLED
10066                         sctp_auditing(8, inp, stcb, NULL);
10067 #endif
10068                         sctp_timer_validation(inp, stcb, asoc);
10069                         return;
10070                 }
10071                 if (ret < 0) {
10072                         /*-
10073                          * The count was off.. retran is not happening so do
10074                          * the normal retransmission.
10075                          */
10076 #ifdef SCTP_AUDITING_ENABLED
10077                         sctp_auditing(9, inp, stcb, NULL);
10078 #endif
10079                         if (ret == SCTP_RETRAN_EXIT) {
10080                                 return;
10081                         }
10082                         break;
10083                 }
10084                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10085                         /* Only one transmission allowed out of a timeout */
10086 #ifdef SCTP_AUDITING_ENABLED
10087                         sctp_auditing(10, inp, stcb, NULL);
10088 #endif
10089                         /* Push out any control */
10090                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10091                             &now, &now_filled, frag_point, so_locked);
10092                         return;
10093                 }
10094                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10095                         /* Hit FR burst limit */
10096                         return;
10097                 }
10098                 if ((num_out == 0) && (ret == 0)) {
10099                         /* No more retrans to send */
10100                         break;
10101                 }
10102         }
10103 #ifdef SCTP_AUDITING_ENABLED
10104         sctp_auditing(12, inp, stcb, NULL);
10105 #endif
10106         /* Check for bad destinations, if they exist move chunks around. */
10107         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10108                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10109                         /*-
10110                          * if possible move things off of this address we
10111                          * still may send below due to the dormant state but
10112                          * we try to find an alternate address to send to
10113                          * and if we have one we move all queued data on the
10114                          * out wheel to this alternate address.
10115                          */
10116                         if (net->ref_count > 1)
10117                                 sctp_move_chunks_from_net(stcb, net);
10118                 } else {
10119                         /*-
10120                          * if ((asoc->sat_network) || (net->addr_is_local))
10121                          * { burst_limit = asoc->max_burst *
10122                          * SCTP_SAT_NETWORK_BURST_INCR; }
10123                          */
10124                         if (asoc->max_burst > 0) {
10125                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10126                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10127                                                 /*
10128                                                  * JRS - Use the congestion
10129                                                  * control given in the
10130                                                  * congestion control module
10131                                                  */
10132                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10133                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10134                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10135                                                 }
10136                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10137                                         }
10138                                         net->fast_retran_ip = 0;
10139                                 } else {
10140                                         if (net->flight_size == 0) {
10141                                                 /*
10142                                                  * Should be decaying the
10143                                                  * cwnd here
10144                                                  */
10145                                                 ;
10146                                         }
10147                                 }
10148                         }
10149                 }
10150
10151         }
10152         burst_cnt = 0;
10153         do {
10154                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10155                     &reason_code, 0, from_where,
10156                     &now, &now_filled, frag_point, so_locked);
10157                 if (error) {
10158                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10159                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10160                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10161                         }
10162                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10163                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10164                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10165                         }
10166                         break;
10167                 }
10168                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10169
10170                 tot_out += num_out;
10171                 burst_cnt++;
10172                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10173                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10174                         if (num_out == 0) {
10175                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10176                         }
10177                 }
10178                 if (nagle_on) {
10179                         /*
10180                          * When the Nagle algorithm is used, look at how
10181                          * much is unsent, then if its smaller than an MTU
10182                          * and we have data in flight we stop, except if we
10183                          * are handling a fragmented user message.
10184                          */
10185                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10186                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10187                             (stcb->asoc.total_flight > 0)) {
10188 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10189                                 break;
10190                         }
10191                 }
10192                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10193                     TAILQ_EMPTY(&asoc->send_queue) &&
10194                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10195                         /* Nothing left to send */
10196                         break;
10197                 }
10198                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10199                         /* Nothing left to send */
10200                         break;
10201                 }
10202         } while (num_out &&
10203             ((asoc->max_burst == 0) ||
10204             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10205             (burst_cnt < asoc->max_burst)));
10206
10207         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10208                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10209                         SCTP_STAT_INCR(sctps_maxburstqueued);
10210                         asoc->burst_limit_applied = 1;
10211                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10212                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10213                         }
10214                 } else {
10215                         asoc->burst_limit_applied = 0;
10216                 }
10217         }
10218         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10219                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10220         }
10221         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10222             tot_out);
10223
10224         /*-
10225          * Now we need to clean up the control chunk chain if a ECNE is on
10226          * it. It must be marked as UNSENT again so next call will continue
10227          * to send it until such time that we get a CWR, to remove it.
10228          */
10229         if (stcb->asoc.ecn_echo_cnt_onq)
10230                 sctp_fix_ecn_echo(asoc);
10231
10232         if (stcb->asoc.trigger_reset) {
10233                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10234                         goto do_it_again;
10235                 }
10236         }
10237         return;
10238 }
10239
10240
10241 int
10242 sctp_output(
10243     struct sctp_inpcb *inp,
10244     struct mbuf *m,
10245     struct sockaddr *addr,
10246     struct mbuf *control,
10247     struct thread *p,
10248     int flags)
10249 {
10250         if (inp == NULL) {
10251                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10252                 return (EINVAL);
10253         }
10254         if (inp->sctp_socket == NULL) {
10255                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10256                 return (EINVAL);
10257         }
10258         return (sctp_sosend(inp->sctp_socket,
10259             addr,
10260             (struct uio *)NULL,
10261             m,
10262             control,
10263             flags, p
10264             ));
10265 }
10266
10267 void
10268 send_forward_tsn(struct sctp_tcb *stcb,
10269     struct sctp_association *asoc)
10270 {
10271         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10272         struct sctp_forward_tsn_chunk *fwdtsn;
10273         struct sctp_strseq *strseq;
10274         struct sctp_strseq_mid *strseq_m;
10275         uint32_t advance_peer_ack_point;
10276         unsigned int cnt_of_space, i, ovh;
10277         unsigned int space_needed;
10278         unsigned int cnt_of_skipped = 0;
10279
10280         SCTP_TCB_LOCK_ASSERT(stcb);
10281         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10282                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10283                         /* mark it to unsent */
10284                         chk->sent = SCTP_DATAGRAM_UNSENT;
10285                         chk->snd_count = 0;
10286                         /* Do we correct its output location? */
10287                         if (chk->whoTo) {
10288                                 sctp_free_remote_addr(chk->whoTo);
10289                                 chk->whoTo = NULL;
10290                         }
10291                         goto sctp_fill_in_rest;
10292                 }
10293         }
10294         /* Ok if we reach here we must build one */
10295         sctp_alloc_a_chunk(stcb, chk);
10296         if (chk == NULL) {
10297                 return;
10298         }
10299         asoc->fwd_tsn_cnt++;
10300         chk->copy_by_ref = 0;
10301         /*
10302          * We don't do the old thing here since this is used not for on-wire
10303          * but to tell if we are sending a fwd-tsn by the stack during
10304          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10305          */
10306         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10307         chk->rec.chunk_id.can_take_data = 0;
10308         chk->flags = 0;
10309         chk->asoc = asoc;
10310         chk->whoTo = NULL;
10311         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10312         if (chk->data == NULL) {
10313                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10314                 return;
10315         }
10316         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10317         chk->sent = SCTP_DATAGRAM_UNSENT;
10318         chk->snd_count = 0;
10319         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10320         asoc->ctrl_queue_cnt++;
10321 sctp_fill_in_rest:
10322         /*-
10323          * Here we go through and fill out the part that deals with
10324          * stream/seq of the ones we skip.
10325          */
10326         SCTP_BUF_LEN(chk->data) = 0;
10327         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10328                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10329                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10330                         /* no more to look at */
10331                         break;
10332                 }
10333                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10334                         /* We don't report these */
10335                         continue;
10336                 }
10337                 cnt_of_skipped++;
10338         }
10339         if (asoc->idata_supported) {
10340                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10341                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10342         } else {
10343                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10344                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10345         }
10346         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10347
10348         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10349                 ovh = SCTP_MIN_OVERHEAD;
10350         } else {
10351                 ovh = SCTP_MIN_V4_OVERHEAD;
10352         }
10353         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10354                 /* trim to a mtu size */
10355                 cnt_of_space = asoc->smallest_mtu - ovh;
10356         }
10357         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10358                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10359                     0xff, 0, cnt_of_skipped,
10360                     asoc->advanced_peer_ack_point);
10361         }
10362         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10363         if (cnt_of_space < space_needed) {
10364                 /*-
10365                  * ok we must trim down the chunk by lowering the
10366                  * advance peer ack point.
10367                  */
10368                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10369                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10370                             0xff, 0xff, cnt_of_space,
10371                             space_needed);
10372                 }
10373                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10374                 if (asoc->idata_supported) {
10375                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10376                 } else {
10377                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10378                 }
10379                 /*-
10380                  * Go through and find the TSN that will be the one
10381                  * we report.
10382                  */
10383                 at = TAILQ_FIRST(&asoc->sent_queue);
10384                 if (at != NULL) {
10385                         for (i = 0; i < cnt_of_skipped; i++) {
10386                                 tp1 = TAILQ_NEXT(at, sctp_next);
10387                                 if (tp1 == NULL) {
10388                                         break;
10389                                 }
10390                                 at = tp1;
10391                         }
10392                 }
10393                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10394                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10395                             0xff, cnt_of_skipped, at->rec.data.tsn,
10396                             asoc->advanced_peer_ack_point);
10397                 }
10398                 last = at;
10399                 /*-
10400                  * last now points to last one I can report, update
10401                  * peer ack point
10402                  */
10403                 if (last) {
10404                         advance_peer_ack_point = last->rec.data.tsn;
10405                 }
10406                 if (asoc->idata_supported) {
10407                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10408                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10409                 } else {
10410                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10411                             cnt_of_skipped * sizeof(struct sctp_strseq);
10412                 }
10413         }
10414         chk->send_size = space_needed;
10415         /* Setup the chunk */
10416         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10417         fwdtsn->ch.chunk_length = htons(chk->send_size);
10418         fwdtsn->ch.chunk_flags = 0;
10419         if (asoc->idata_supported) {
10420                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10421         } else {
10422                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10423         }
10424         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10425         SCTP_BUF_LEN(chk->data) = chk->send_size;
10426         fwdtsn++;
10427         /*-
10428          * Move pointer to after the fwdtsn and transfer to the
10429          * strseq pointer.
10430          */
10431         if (asoc->idata_supported) {
10432                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10433                 strseq = NULL;
10434         } else {
10435                 strseq = (struct sctp_strseq *)fwdtsn;
10436                 strseq_m = NULL;
10437         }
10438         /*-
10439          * Now populate the strseq list. This is done blindly
10440          * without pulling out duplicate stream info. This is
10441          * inefficent but won't harm the process since the peer will
10442          * look at these in sequence and will thus release anything.
10443          * It could mean we exceed the PMTU and chop off some that
10444          * we could have included.. but this is unlikely (aka 1432/4
10445          * would mean 300+ stream seq's would have to be reported in
10446          * one FWD-TSN. With a bit of work we can later FIX this to
10447          * optimize and pull out duplicates.. but it does add more
10448          * overhead. So for now... not!
10449          */
10450         i = 0;
10451         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10452                 if (i >= cnt_of_skipped) {
10453                         break;
10454                 }
10455                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10456                         /* We don't report these */
10457                         continue;
10458                 }
10459                 if (at->rec.data.tsn == advance_peer_ack_point) {
10460                         at->rec.data.fwd_tsn_cnt = 0;
10461                 }
10462                 if (asoc->idata_supported) {
10463                         strseq_m->sid = htons(at->rec.data.sid);
10464                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10465                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10466                         } else {
10467                                 strseq_m->flags = 0;
10468                         }
10469                         strseq_m->mid = htonl(at->rec.data.mid);
10470                         strseq_m++;
10471                 } else {
10472                         strseq->sid = htons(at->rec.data.sid);
10473                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10474                         strseq++;
10475                 }
10476                 i++;
10477         }
10478         return;
10479 }
10480
10481 void
10482 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10483 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10484     SCTP_UNUSED
10485 #endif
10486 )
10487 {
10488         /*-
10489          * Queue up a SACK or NR-SACK in the control queue.
10490          * We must first check to see if a SACK or NR-SACK is
10491          * somehow on the control queue.
10492          * If so, we will take and and remove the old one.
10493          */
10494         struct sctp_association *asoc;
10495         struct sctp_tmit_chunk *chk, *a_chk;
10496         struct sctp_sack_chunk *sack;
10497         struct sctp_nr_sack_chunk *nr_sack;
10498         struct sctp_gap_ack_block *gap_descriptor;
10499         const struct sack_track *selector;
10500         int mergeable = 0;
10501         int offset;
10502         caddr_t limit;
10503         uint32_t *dup;
10504         int limit_reached = 0;
10505         unsigned int i, siz, j;
10506         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10507         int num_dups = 0;
10508         int space_req;
10509         uint32_t highest_tsn;
10510         uint8_t flags;
10511         uint8_t type;
10512         uint8_t tsn_map;
10513
10514         if (stcb->asoc.nrsack_supported == 1) {
10515                 type = SCTP_NR_SELECTIVE_ACK;
10516         } else {
10517                 type = SCTP_SELECTIVE_ACK;
10518         }
10519         a_chk = NULL;
10520         asoc = &stcb->asoc;
10521         SCTP_TCB_LOCK_ASSERT(stcb);
10522         if (asoc->last_data_chunk_from == NULL) {
10523                 /* Hmm we never received anything */
10524                 return;
10525         }
10526         sctp_slide_mapping_arrays(stcb);
10527         sctp_set_rwnd(stcb, asoc);
10528         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10529                 if (chk->rec.chunk_id.id == type) {
10530                         /* Hmm, found a sack already on queue, remove it */
10531                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10532                         asoc->ctrl_queue_cnt--;
10533                         a_chk = chk;
10534                         if (a_chk->data) {
10535                                 sctp_m_freem(a_chk->data);
10536                                 a_chk->data = NULL;
10537                         }
10538                         if (a_chk->whoTo) {
10539                                 sctp_free_remote_addr(a_chk->whoTo);
10540                                 a_chk->whoTo = NULL;
10541                         }
10542                         break;
10543                 }
10544         }
10545         if (a_chk == NULL) {
10546                 sctp_alloc_a_chunk(stcb, a_chk);
10547                 if (a_chk == NULL) {
10548                         /* No memory so we drop the idea, and set a timer */
10549                         if (stcb->asoc.delayed_ack) {
10550                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10551                                     stcb->sctp_ep, stcb, NULL,
10552                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10553                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10554                                     stcb->sctp_ep, stcb, NULL);
10555                         } else {
10556                                 stcb->asoc.send_sack = 1;
10557                         }
10558                         return;
10559                 }
10560                 a_chk->copy_by_ref = 0;
10561                 a_chk->rec.chunk_id.id = type;
10562                 a_chk->rec.chunk_id.can_take_data = 1;
10563         }
10564         /* Clear our pkt counts */
10565         asoc->data_pkts_seen = 0;
10566
10567         a_chk->flags = 0;
10568         a_chk->asoc = asoc;
10569         a_chk->snd_count = 0;
10570         a_chk->send_size = 0;   /* fill in later */
10571         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10572         a_chk->whoTo = NULL;
10573
10574         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10575                 /*-
10576                  * Ok, the destination for the SACK is unreachable, lets see if
10577                  * we can select an alternate to asoc->last_data_chunk_from
10578                  */
10579                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10580                 if (a_chk->whoTo == NULL) {
10581                         /* Nope, no alternate */
10582                         a_chk->whoTo = asoc->last_data_chunk_from;
10583                 }
10584         } else {
10585                 a_chk->whoTo = asoc->last_data_chunk_from;
10586         }
10587         if (a_chk->whoTo) {
10588                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10589         }
10590         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10591                 highest_tsn = asoc->highest_tsn_inside_map;
10592         } else {
10593                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10594         }
10595         if (highest_tsn == asoc->cumulative_tsn) {
10596                 /* no gaps */
10597                 if (type == SCTP_SELECTIVE_ACK) {
10598                         space_req = sizeof(struct sctp_sack_chunk);
10599                 } else {
10600                         space_req = sizeof(struct sctp_nr_sack_chunk);
10601                 }
10602         } else {
10603                 /* gaps get a cluster */
10604                 space_req = MCLBYTES;
10605         }
10606         /* Ok now lets formulate a MBUF with our sack */
10607         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10608         if ((a_chk->data == NULL) ||
10609             (a_chk->whoTo == NULL)) {
10610                 /* rats, no mbuf memory */
10611                 if (a_chk->data) {
10612                         /* was a problem with the destination */
10613                         sctp_m_freem(a_chk->data);
10614                         a_chk->data = NULL;
10615                 }
10616                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10617                 /* sa_ignore NO_NULL_CHK */
10618                 if (stcb->asoc.delayed_ack) {
10619                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10620                             stcb->sctp_ep, stcb, NULL,
10621                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10622                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10623                             stcb->sctp_ep, stcb, NULL);
10624                 } else {
10625                         stcb->asoc.send_sack = 1;
10626                 }
10627                 return;
10628         }
10629         /* ok, lets go through and fill it in */
10630         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10631         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10632         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10633                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10634         }
10635         limit = mtod(a_chk->data, caddr_t);
10636         limit += space;
10637
10638         flags = 0;
10639
10640         if ((asoc->sctp_cmt_on_off > 0) &&
10641             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10642                 /*-
10643                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10644                  * received, then set high bit to 1, else 0. Reset
10645                  * pkts_rcvd.
10646                  */
10647                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10648                 asoc->cmt_dac_pkts_rcvd = 0;
10649         }
10650 #ifdef SCTP_ASOCLOG_OF_TSNS
10651         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10652         stcb->asoc.cumack_log_atsnt++;
10653         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10654                 stcb->asoc.cumack_log_atsnt = 0;
10655         }
10656 #endif
10657         /* reset the readers interpretation */
10658         stcb->freed_by_sorcv_sincelast = 0;
10659
10660         if (type == SCTP_SELECTIVE_ACK) {
10661                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10662                 nr_sack = NULL;
10663                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10664                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10665                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10666                 } else {
10667                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10668                 }
10669         } else {
10670                 sack = NULL;
10671                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10672                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10673                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10674                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10675                 } else {
10676                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10677                 }
10678         }
10679
10680         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10681                 offset = 1;
10682         } else {
10683                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10684         }
10685         if (((type == SCTP_SELECTIVE_ACK) &&
10686             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10687             ((type == SCTP_NR_SELECTIVE_ACK) &&
10688             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10689                 /* we have a gap .. maybe */
10690                 for (i = 0; i < siz; i++) {
10691                         tsn_map = asoc->mapping_array[i];
10692                         if (type == SCTP_SELECTIVE_ACK) {
10693                                 tsn_map |= asoc->nr_mapping_array[i];
10694                         }
10695                         if (i == 0) {
10696                                 /*
10697                                  * Clear all bits corresponding to TSNs
10698                                  * smaller or equal to the cumulative TSN.
10699                                  */
10700                                 tsn_map &= (~0U << (1 - offset));
10701                         }
10702                         selector = &sack_array[tsn_map];
10703                         if (mergeable && selector->right_edge) {
10704                                 /*
10705                                  * Backup, left and right edges were ok to
10706                                  * merge.
10707                                  */
10708                                 num_gap_blocks--;
10709                                 gap_descriptor--;
10710                         }
10711                         if (selector->num_entries == 0)
10712                                 mergeable = 0;
10713                         else {
10714                                 for (j = 0; j < selector->num_entries; j++) {
10715                                         if (mergeable && selector->right_edge) {
10716                                                 /*
10717                                                  * do a merge by NOT setting
10718                                                  * the left side
10719                                                  */
10720                                                 mergeable = 0;
10721                                         } else {
10722                                                 /*
10723                                                  * no merge, set the left
10724                                                  * side
10725                                                  */
10726                                                 mergeable = 0;
10727                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10728                                         }
10729                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10730                                         num_gap_blocks++;
10731                                         gap_descriptor++;
10732                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10733                                                 /* no more room */
10734                                                 limit_reached = 1;
10735                                                 break;
10736                                         }
10737                                 }
10738                                 if (selector->left_edge) {
10739                                         mergeable = 1;
10740                                 }
10741                         }
10742                         if (limit_reached) {
10743                                 /* Reached the limit stop */
10744                                 break;
10745                         }
10746                         offset += 8;
10747                 }
10748         }
10749         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10750             (limit_reached == 0)) {
10751
10752                 mergeable = 0;
10753
10754                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10755                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10756                 } else {
10757                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10758                 }
10759
10760                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10761                         offset = 1;
10762                 } else {
10763                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10764                 }
10765                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10766                         /* we have a gap .. maybe */
10767                         for (i = 0; i < siz; i++) {
10768                                 tsn_map = asoc->nr_mapping_array[i];
10769                                 if (i == 0) {
10770                                         /*
10771                                          * Clear all bits corresponding to
10772                                          * TSNs smaller or equal to the
10773                                          * cumulative TSN.
10774                                          */
10775                                         tsn_map &= (~0U << (1 - offset));
10776                                 }
10777                                 selector = &sack_array[tsn_map];
10778                                 if (mergeable && selector->right_edge) {
10779                                         /*
10780                                          * Backup, left and right edges were
10781                                          * ok to merge.
10782                                          */
10783                                         num_nr_gap_blocks--;
10784                                         gap_descriptor--;
10785                                 }
10786                                 if (selector->num_entries == 0)
10787                                         mergeable = 0;
10788                                 else {
10789                                         for (j = 0; j < selector->num_entries; j++) {
10790                                                 if (mergeable && selector->right_edge) {
10791                                                         /*
10792                                                          * do a merge by NOT
10793                                                          * setting the left
10794                                                          * side
10795                                                          */
10796                                                         mergeable = 0;
10797                                                 } else {
10798                                                         /*
10799                                                          * no merge, set the
10800                                                          * left side
10801                                                          */
10802                                                         mergeable = 0;
10803                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10804                                                 }
10805                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10806                                                 num_nr_gap_blocks++;
10807                                                 gap_descriptor++;
10808                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10809                                                         /* no more room */
10810                                                         limit_reached = 1;
10811                                                         break;
10812                                                 }
10813                                         }
10814                                         if (selector->left_edge) {
10815                                                 mergeable = 1;
10816                                         }
10817                                 }
10818                                 if (limit_reached) {
10819                                         /* Reached the limit stop */
10820                                         break;
10821                                 }
10822                                 offset += 8;
10823                         }
10824                 }
10825         }
10826         /* now we must add any dups we are going to report. */
10827         if ((limit_reached == 0) && (asoc->numduptsns)) {
10828                 dup = (uint32_t *)gap_descriptor;
10829                 for (i = 0; i < asoc->numduptsns; i++) {
10830                         *dup = htonl(asoc->dup_tsns[i]);
10831                         dup++;
10832                         num_dups++;
10833                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10834                                 /* no more room */
10835                                 break;
10836                         }
10837                 }
10838                 asoc->numduptsns = 0;
10839         }
10840         /*
10841          * now that the chunk is prepared queue it to the control chunk
10842          * queue.
10843          */
10844         if (type == SCTP_SELECTIVE_ACK) {
10845                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10846                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10847                     num_dups * sizeof(int32_t));
10848                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10849                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10850                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10851                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10852                 sack->sack.num_dup_tsns = htons(num_dups);
10853                 sack->ch.chunk_type = type;
10854                 sack->ch.chunk_flags = flags;
10855                 sack->ch.chunk_length = htons(a_chk->send_size);
10856         } else {
10857                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10858                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10859                     num_dups * sizeof(int32_t));
10860                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10861                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10862                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10863                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10864                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10865                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10866                 nr_sack->nr_sack.reserved = 0;
10867                 nr_sack->ch.chunk_type = type;
10868                 nr_sack->ch.chunk_flags = flags;
10869                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10870         }
10871         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10872         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10873         asoc->ctrl_queue_cnt++;
10874         asoc->send_sack = 0;
10875         SCTP_STAT_INCR(sctps_sendsacks);
10876         return;
10877 }
10878
10879 void
10880 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10881 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10882     SCTP_UNUSED
10883 #endif
10884 )
10885 {
10886         struct mbuf *m_abort, *m, *m_last;
10887         struct mbuf *m_out, *m_end = NULL;
10888         struct sctp_abort_chunk *abort;
10889         struct sctp_auth_chunk *auth = NULL;
10890         struct sctp_nets *net;
10891         uint32_t vtag;
10892         uint32_t auth_offset = 0;
10893         int error;
10894         uint16_t cause_len, chunk_len, padding_len;
10895
10896         SCTP_TCB_LOCK_ASSERT(stcb);
10897         /*-
10898          * Add an AUTH chunk, if chunk requires it and save the offset into
10899          * the chain for AUTH
10900          */
10901         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10902             stcb->asoc.peer_auth_chunks)) {
10903                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10904                     stcb, SCTP_ABORT_ASSOCIATION);
10905                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10906         } else {
10907                 m_out = NULL;
10908         }
10909         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10910         if (m_abort == NULL) {
10911                 if (m_out) {
10912                         sctp_m_freem(m_out);
10913                 }
10914                 if (operr) {
10915                         sctp_m_freem(operr);
10916                 }
10917                 return;
10918         }
10919         /* link in any error */
10920         SCTP_BUF_NEXT(m_abort) = operr;
10921         cause_len = 0;
10922         m_last = NULL;
10923         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10924                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10925                 if (SCTP_BUF_NEXT(m) == NULL) {
10926                         m_last = m;
10927                 }
10928         }
10929         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10930         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10931         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10932         if (m_out == NULL) {
10933                 /* NO Auth chunk prepended, so reserve space in front */
10934                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10935                 m_out = m_abort;
10936         } else {
10937                 /* Put AUTH chunk at the front of the chain */
10938                 SCTP_BUF_NEXT(m_end) = m_abort;
10939         }
10940         if (stcb->asoc.alternate) {
10941                 net = stcb->asoc.alternate;
10942         } else {
10943                 net = stcb->asoc.primary_destination;
10944         }
10945         /* Fill in the ABORT chunk header. */
10946         abort = mtod(m_abort, struct sctp_abort_chunk *);
10947         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10948         if (stcb->asoc.peer_vtag == 0) {
10949                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10950                 vtag = stcb->asoc.my_vtag;
10951                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10952         } else {
10953                 vtag = stcb->asoc.peer_vtag;
10954                 abort->ch.chunk_flags = 0;
10955         }
10956         abort->ch.chunk_length = htons(chunk_len);
10957         /* Add padding, if necessary. */
10958         if (padding_len > 0) {
10959                 if ((m_last == NULL) ||
10960                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10961                         sctp_m_freem(m_out);
10962                         return;
10963                 }
10964         }
10965         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10966             (struct sockaddr *)&net->ro._l_addr,
10967             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10968             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10969             stcb->asoc.primary_destination->port, NULL,
10970             0, 0,
10971             so_locked))) {
10972                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10973                 if (error == ENOBUFS) {
10974                         stcb->asoc.ifp_had_enobuf = 1;
10975                         SCTP_STAT_INCR(sctps_lowlevelerr);
10976                 }
10977         } else {
10978                 stcb->asoc.ifp_had_enobuf = 0;
10979         }
10980         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10981 }
10982
10983 void
10984 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10985     struct sctp_nets *net,
10986     int reflect_vtag)
10987 {
10988         /* formulate and SEND a SHUTDOWN-COMPLETE */
10989         struct mbuf *m_shutdown_comp;
10990         struct sctp_shutdown_complete_chunk *shutdown_complete;
10991         uint32_t vtag;
10992         int error;
10993         uint8_t flags;
10994
10995         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10996         if (m_shutdown_comp == NULL) {
10997                 /* no mbuf's */
10998                 return;
10999         }
11000         if (reflect_vtag) {
11001                 flags = SCTP_HAD_NO_TCB;
11002                 vtag = stcb->asoc.my_vtag;
11003         } else {
11004                 flags = 0;
11005                 vtag = stcb->asoc.peer_vtag;
11006         }
11007         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11008         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11009         shutdown_complete->ch.chunk_flags = flags;
11010         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11011         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11012         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11013             (struct sockaddr *)&net->ro._l_addr,
11014             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11015             stcb->sctp_ep->sctp_lport, stcb->rport,
11016             htonl(vtag),
11017             net->port, NULL,
11018             0, 0,
11019             SCTP_SO_NOT_LOCKED))) {
11020                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11021                 if (error == ENOBUFS) {
11022                         stcb->asoc.ifp_had_enobuf = 1;
11023                         SCTP_STAT_INCR(sctps_lowlevelerr);
11024                 }
11025         } else {
11026                 stcb->asoc.ifp_had_enobuf = 0;
11027         }
11028         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11029         return;
11030 }
11031
11032 static void
11033 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11034     struct sctphdr *sh, uint32_t vtag,
11035     uint8_t type, struct mbuf *cause,
11036     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11037     uint32_t vrf_id, uint16_t port)
11038 {
11039         struct mbuf *o_pak;
11040         struct mbuf *mout;
11041         struct sctphdr *shout;
11042         struct sctp_chunkhdr *ch;
11043 #if defined(INET) || defined(INET6)
11044         struct udphdr *udp;
11045         int ret;
11046 #endif
11047         int len, cause_len, padding_len;
11048 #ifdef INET
11049         struct sockaddr_in *src_sin, *dst_sin;
11050         struct ip *ip;
11051 #endif
11052 #ifdef INET6
11053         struct sockaddr_in6 *src_sin6, *dst_sin6;
11054         struct ip6_hdr *ip6;
11055 #endif
11056
11057         /* Compute the length of the cause and add final padding. */
11058         cause_len = 0;
11059         if (cause != NULL) {
11060                 struct mbuf *m_at, *m_last = NULL;
11061
11062                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11063                         if (SCTP_BUF_NEXT(m_at) == NULL)
11064                                 m_last = m_at;
11065                         cause_len += SCTP_BUF_LEN(m_at);
11066                 }
11067                 padding_len = cause_len % 4;
11068                 if (padding_len != 0) {
11069                         padding_len = 4 - padding_len;
11070                 }
11071                 if (padding_len != 0) {
11072                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11073                                 sctp_m_freem(cause);
11074                                 return;
11075                         }
11076                 }
11077         } else {
11078                 padding_len = 0;
11079         }
11080         /* Get an mbuf for the header. */
11081         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11082         switch (dst->sa_family) {
11083 #ifdef INET
11084         case AF_INET:
11085                 len += sizeof(struct ip);
11086                 break;
11087 #endif
11088 #ifdef INET6
11089         case AF_INET6:
11090                 len += sizeof(struct ip6_hdr);
11091                 break;
11092 #endif
11093         default:
11094                 break;
11095         }
11096 #if defined(INET) || defined(INET6)
11097         if (port) {
11098                 len += sizeof(struct udphdr);
11099         }
11100 #endif
11101         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11102         if (mout == NULL) {
11103                 if (cause) {
11104                         sctp_m_freem(cause);
11105                 }
11106                 return;
11107         }
11108         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11109         SCTP_BUF_LEN(mout) = len;
11110         SCTP_BUF_NEXT(mout) = cause;
11111         M_SETFIB(mout, fibnum);
11112         mout->m_pkthdr.flowid = mflowid;
11113         M_HASHTYPE_SET(mout, mflowtype);
11114 #ifdef INET
11115         ip = NULL;
11116 #endif
11117 #ifdef INET6
11118         ip6 = NULL;
11119 #endif
11120         switch (dst->sa_family) {
11121 #ifdef INET
11122         case AF_INET:
11123                 src_sin = (struct sockaddr_in *)src;
11124                 dst_sin = (struct sockaddr_in *)dst;
11125                 ip = mtod(mout, struct ip *);
11126                 ip->ip_v = IPVERSION;
11127                 ip->ip_hl = (sizeof(struct ip) >> 2);
11128                 ip->ip_tos = 0;
11129                 ip->ip_off = htons(IP_DF);
11130                 ip_fillid(ip);
11131                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11132                 if (port) {
11133                         ip->ip_p = IPPROTO_UDP;
11134                 } else {
11135                         ip->ip_p = IPPROTO_SCTP;
11136                 }
11137                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11138                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11139                 ip->ip_sum = 0;
11140                 len = sizeof(struct ip);
11141                 shout = (struct sctphdr *)((caddr_t)ip + len);
11142                 break;
11143 #endif
11144 #ifdef INET6
11145         case AF_INET6:
11146                 src_sin6 = (struct sockaddr_in6 *)src;
11147                 dst_sin6 = (struct sockaddr_in6 *)dst;
11148                 ip6 = mtod(mout, struct ip6_hdr *);
11149                 ip6->ip6_flow = htonl(0x60000000);
11150                 if (V_ip6_auto_flowlabel) {
11151                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11152                 }
11153                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11154                 if (port) {
11155                         ip6->ip6_nxt = IPPROTO_UDP;
11156                 } else {
11157                         ip6->ip6_nxt = IPPROTO_SCTP;
11158                 }
11159                 ip6->ip6_src = dst_sin6->sin6_addr;
11160                 ip6->ip6_dst = src_sin6->sin6_addr;
11161                 len = sizeof(struct ip6_hdr);
11162                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11163                 break;
11164 #endif
11165         default:
11166                 len = 0;
11167                 shout = mtod(mout, struct sctphdr *);
11168                 break;
11169         }
11170 #if defined(INET) || defined(INET6)
11171         if (port) {
11172                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11173                         sctp_m_freem(mout);
11174                         return;
11175                 }
11176                 udp = (struct udphdr *)shout;
11177                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11178                 udp->uh_dport = port;
11179                 udp->uh_sum = 0;
11180                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11181                     sizeof(struct sctphdr) +
11182                     sizeof(struct sctp_chunkhdr) +
11183                     cause_len + padding_len));
11184                 len += sizeof(struct udphdr);
11185                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11186         } else {
11187                 udp = NULL;
11188         }
11189 #endif
11190         shout->src_port = sh->dest_port;
11191         shout->dest_port = sh->src_port;
11192         shout->checksum = 0;
11193         if (vtag) {
11194                 shout->v_tag = htonl(vtag);
11195         } else {
11196                 shout->v_tag = sh->v_tag;
11197         }
11198         len += sizeof(struct sctphdr);
11199         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11200         ch->chunk_type = type;
11201         if (vtag) {
11202                 ch->chunk_flags = 0;
11203         } else {
11204                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11205         }
11206         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11207         len += sizeof(struct sctp_chunkhdr);
11208         len += cause_len + padding_len;
11209
11210         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11211                 sctp_m_freem(mout);
11212                 return;
11213         }
11214         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11215         switch (dst->sa_family) {
11216 #ifdef INET
11217         case AF_INET:
11218                 if (port) {
11219                         if (V_udp_cksum) {
11220                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11221                         } else {
11222                                 udp->uh_sum = 0;
11223                         }
11224                 }
11225                 ip->ip_len = htons(len);
11226                 if (port) {
11227 #if defined(SCTP_WITH_NO_CSUM)
11228                         SCTP_STAT_INCR(sctps_sendnocrc);
11229 #else
11230                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11231                         SCTP_STAT_INCR(sctps_sendswcrc);
11232 #endif
11233                         if (V_udp_cksum) {
11234                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11235                         }
11236                 } else {
11237 #if defined(SCTP_WITH_NO_CSUM)
11238                         SCTP_STAT_INCR(sctps_sendnocrc);
11239 #else
11240                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11241                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11242                         SCTP_STAT_INCR(sctps_sendhwcrc);
11243 #endif
11244                 }
11245 #ifdef SCTP_PACKET_LOGGING
11246                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11247                         sctp_packet_log(o_pak);
11248                 }
11249 #endif
11250                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11251                 break;
11252 #endif
11253 #ifdef INET6
11254         case AF_INET6:
11255                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11256                 if (port) {
11257 #if defined(SCTP_WITH_NO_CSUM)
11258                         SCTP_STAT_INCR(sctps_sendnocrc);
11259 #else
11260                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11261                         SCTP_STAT_INCR(sctps_sendswcrc);
11262 #endif
11263                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11264                                 udp->uh_sum = 0xffff;
11265                         }
11266                 } else {
11267 #if defined(SCTP_WITH_NO_CSUM)
11268                         SCTP_STAT_INCR(sctps_sendnocrc);
11269 #else
11270                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11271                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11272                         SCTP_STAT_INCR(sctps_sendhwcrc);
11273 #endif
11274                 }
11275 #ifdef SCTP_PACKET_LOGGING
11276                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11277                         sctp_packet_log(o_pak);
11278                 }
11279 #endif
11280                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11281                 break;
11282 #endif
11283         default:
11284                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11285                     dst->sa_family);
11286                 sctp_m_freem(mout);
11287                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11288                 return;
11289         }
11290         SCTP_STAT_INCR(sctps_sendpackets);
11291         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11292         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11293         return;
11294 }
11295
11296 void
11297 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11298     struct sctphdr *sh,
11299     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11300     uint32_t vrf_id, uint16_t port)
11301 {
11302         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11303             mflowtype, mflowid, fibnum,
11304             vrf_id, port);
11305 }
11306
11307 void
11308 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11309 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11310     SCTP_UNUSED
11311 #endif
11312 )
11313 {
11314         struct sctp_tmit_chunk *chk;
11315         struct sctp_heartbeat_chunk *hb;
11316         struct timeval now;
11317
11318         SCTP_TCB_LOCK_ASSERT(stcb);
11319         if (net == NULL) {
11320                 return;
11321         }
11322         (void)SCTP_GETTIME_TIMEVAL(&now);
11323         switch (net->ro._l_addr.sa.sa_family) {
11324 #ifdef INET
11325         case AF_INET:
11326                 break;
11327 #endif
11328 #ifdef INET6
11329         case AF_INET6:
11330                 break;
11331 #endif
11332         default:
11333                 return;
11334         }
11335         sctp_alloc_a_chunk(stcb, chk);
11336         if (chk == NULL) {
11337                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11338                 return;
11339         }
11340         chk->copy_by_ref = 0;
11341         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11342         chk->rec.chunk_id.can_take_data = 1;
11343         chk->flags = 0;
11344         chk->asoc = &stcb->asoc;
11345         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11346
11347         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11348         if (chk->data == NULL) {
11349                 sctp_free_a_chunk(stcb, chk, so_locked);
11350                 return;
11351         }
11352         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11353         SCTP_BUF_LEN(chk->data) = chk->send_size;
11354         chk->sent = SCTP_DATAGRAM_UNSENT;
11355         chk->snd_count = 0;
11356         chk->whoTo = net;
11357         atomic_add_int(&chk->whoTo->ref_count, 1);
11358         /* Now we have a mbuf that we can fill in with the details */
11359         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11360         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11361         /* fill out chunk header */
11362         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11363         hb->ch.chunk_flags = 0;
11364         hb->ch.chunk_length = htons(chk->send_size);
11365         /* Fill out hb parameter */
11366         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11367         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11368         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11369         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11370         /* Did our user request this one, put it in */
11371         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11372         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11373         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11374                 /*
11375                  * we only take from the entropy pool if the address is not
11376                  * confirmed.
11377                  */
11378                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11379                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11380         } else {
11381                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11382                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11383         }
11384         switch (net->ro._l_addr.sa.sa_family) {
11385 #ifdef INET
11386         case AF_INET:
11387                 memcpy(hb->heartbeat.hb_info.address,
11388                     &net->ro._l_addr.sin.sin_addr,
11389                     sizeof(net->ro._l_addr.sin.sin_addr));
11390                 break;
11391 #endif
11392 #ifdef INET6
11393         case AF_INET6:
11394                 memcpy(hb->heartbeat.hb_info.address,
11395                     &net->ro._l_addr.sin6.sin6_addr,
11396                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11397                 break;
11398 #endif
11399         default:
11400                 if (chk->data) {
11401                         sctp_m_freem(chk->data);
11402                         chk->data = NULL;
11403                 }
11404                 sctp_free_a_chunk(stcb, chk, so_locked);
11405                 return;
11406                 break;
11407         }
11408         net->hb_responded = 0;
11409         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11410         stcb->asoc.ctrl_queue_cnt++;
11411         SCTP_STAT_INCR(sctps_sendheartbeat);
11412         return;
11413 }
11414
11415 void
11416 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11417     uint32_t high_tsn)
11418 {
11419         struct sctp_association *asoc;
11420         struct sctp_ecne_chunk *ecne;
11421         struct sctp_tmit_chunk *chk;
11422
11423         if (net == NULL) {
11424                 return;
11425         }
11426         asoc = &stcb->asoc;
11427         SCTP_TCB_LOCK_ASSERT(stcb);
11428         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11429                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11430                         /* found a previous ECN_ECHO update it if needed */
11431                         uint32_t cnt, ctsn;
11432
11433                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11434                         ctsn = ntohl(ecne->tsn);
11435                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11436                                 ecne->tsn = htonl(high_tsn);
11437                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11438                         }
11439                         cnt = ntohl(ecne->num_pkts_since_cwr);
11440                         cnt++;
11441                         ecne->num_pkts_since_cwr = htonl(cnt);
11442                         return;
11443                 }
11444         }
11445         /* nope could not find one to update so we must build one */
11446         sctp_alloc_a_chunk(stcb, chk);
11447         if (chk == NULL) {
11448                 return;
11449         }
11450         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11451         chk->copy_by_ref = 0;
11452         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11453         chk->rec.chunk_id.can_take_data = 0;
11454         chk->flags = 0;
11455         chk->asoc = &stcb->asoc;
11456         chk->send_size = sizeof(struct sctp_ecne_chunk);
11457         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11458         if (chk->data == NULL) {
11459                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11460                 return;
11461         }
11462         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11463         SCTP_BUF_LEN(chk->data) = chk->send_size;
11464         chk->sent = SCTP_DATAGRAM_UNSENT;
11465         chk->snd_count = 0;
11466         chk->whoTo = net;
11467         atomic_add_int(&chk->whoTo->ref_count, 1);
11468
11469         stcb->asoc.ecn_echo_cnt_onq++;
11470         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11471         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11472         ecne->ch.chunk_flags = 0;
11473         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11474         ecne->tsn = htonl(high_tsn);
11475         ecne->num_pkts_since_cwr = htonl(1);
11476         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11477         asoc->ctrl_queue_cnt++;
11478 }
11479
11480 void
11481 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11482     struct mbuf *m, int len, int iphlen, int bad_crc)
11483 {
11484         struct sctp_association *asoc;
11485         struct sctp_pktdrop_chunk *drp;
11486         struct sctp_tmit_chunk *chk;
11487         uint8_t *datap;
11488         int was_trunc = 0;
11489         int fullsz = 0;
11490         long spc;
11491         int offset;
11492         struct sctp_chunkhdr *ch, chunk_buf;
11493         unsigned int chk_length;
11494
11495         if (!stcb) {
11496                 return;
11497         }
11498         asoc = &stcb->asoc;
11499         SCTP_TCB_LOCK_ASSERT(stcb);
11500         if (asoc->pktdrop_supported == 0) {
11501                 /*-
11502                  * peer must declare support before I send one.
11503                  */
11504                 return;
11505         }
11506         if (stcb->sctp_socket == NULL) {
11507                 return;
11508         }
11509         sctp_alloc_a_chunk(stcb, chk);
11510         if (chk == NULL) {
11511                 return;
11512         }
11513         chk->copy_by_ref = 0;
11514         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11515         chk->rec.chunk_id.can_take_data = 1;
11516         chk->flags = 0;
11517         len -= iphlen;
11518         chk->send_size = len;
11519         /* Validate that we do not have an ABORT in here. */
11520         offset = iphlen + sizeof(struct sctphdr);
11521         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11522             sizeof(*ch), (uint8_t *)&chunk_buf);
11523         while (ch != NULL) {
11524                 chk_length = ntohs(ch->chunk_length);
11525                 if (chk_length < sizeof(*ch)) {
11526                         /* break to abort land */
11527                         break;
11528                 }
11529                 switch (ch->chunk_type) {
11530                 case SCTP_PACKET_DROPPED:
11531                 case SCTP_ABORT_ASSOCIATION:
11532                 case SCTP_INITIATION_ACK:
11533                         /**
11534                          * We don't respond with an PKT-DROP to an ABORT
11535                          * or PKT-DROP. We also do not respond to an
11536                          * INIT-ACK, because we can't know if the initiation
11537                          * tag is correct or not.
11538                          */
11539                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11540                         return;
11541                 default:
11542                         break;
11543                 }
11544                 offset += SCTP_SIZE32(chk_length);
11545                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11546                     sizeof(*ch), (uint8_t *)&chunk_buf);
11547         }
11548
11549         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11550             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11551                 /*
11552                  * only send 1 mtu worth, trim off the excess on the end.
11553                  */
11554                 fullsz = len;
11555                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11556                 was_trunc = 1;
11557         }
11558         chk->asoc = &stcb->asoc;
11559         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11560         if (chk->data == NULL) {
11561 jump_out:
11562                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11563                 return;
11564         }
11565         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11566         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11567         if (drp == NULL) {
11568                 sctp_m_freem(chk->data);
11569                 chk->data = NULL;
11570                 goto jump_out;
11571         }
11572         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11573             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11574         chk->book_size_scale = 0;
11575         if (was_trunc) {
11576                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11577                 drp->trunc_len = htons(fullsz);
11578                 /*
11579                  * Len is already adjusted to size minus overhead above take
11580                  * out the pkt_drop chunk itself from it.
11581                  */
11582                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11583                 len = chk->send_size;
11584         } else {
11585                 /* no truncation needed */
11586                 drp->ch.chunk_flags = 0;
11587                 drp->trunc_len = htons(0);
11588         }
11589         if (bad_crc) {
11590                 drp->ch.chunk_flags |= SCTP_BADCRC;
11591         }
11592         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11593         SCTP_BUF_LEN(chk->data) = chk->send_size;
11594         chk->sent = SCTP_DATAGRAM_UNSENT;
11595         chk->snd_count = 0;
11596         if (net) {
11597                 /* we should hit here */
11598                 chk->whoTo = net;
11599                 atomic_add_int(&chk->whoTo->ref_count, 1);
11600         } else {
11601                 chk->whoTo = NULL;
11602         }
11603         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11604         drp->ch.chunk_length = htons(chk->send_size);
11605         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11606         if (spc < 0) {
11607                 spc = 0;
11608         }
11609         drp->bottle_bw = htonl(spc);
11610         if (asoc->my_rwnd) {
11611                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11612                     asoc->size_on_all_streams +
11613                     asoc->my_rwnd_control_len +
11614                     stcb->sctp_socket->so_rcv.sb_cc);
11615         } else {
11616                 /*-
11617                  * If my rwnd is 0, possibly from mbuf depletion as well as
11618                  * space used, tell the peer there is NO space aka onq == bw
11619                  */
11620                 drp->current_onq = htonl(spc);
11621         }
11622         drp->reserved = 0;
11623         datap = drp->data;
11624         m_copydata(m, iphlen, len, (caddr_t)datap);
11625         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11626         asoc->ctrl_queue_cnt++;
11627 }
11628
11629 void
11630 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11631 {
11632         struct sctp_association *asoc;
11633         struct sctp_cwr_chunk *cwr;
11634         struct sctp_tmit_chunk *chk;
11635
11636         SCTP_TCB_LOCK_ASSERT(stcb);
11637         if (net == NULL) {
11638                 return;
11639         }
11640         asoc = &stcb->asoc;
11641         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11642                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11643                         /*
11644                          * found a previous CWR queued to same destination
11645                          * update it if needed
11646                          */
11647                         uint32_t ctsn;
11648
11649                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11650                         ctsn = ntohl(cwr->tsn);
11651                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11652                                 cwr->tsn = htonl(high_tsn);
11653                         }
11654                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11655                                 /* Make sure override is carried */
11656                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11657                         }
11658                         return;
11659                 }
11660         }
11661         sctp_alloc_a_chunk(stcb, chk);
11662         if (chk == NULL) {
11663                 return;
11664         }
11665         chk->copy_by_ref = 0;
11666         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11667         chk->rec.chunk_id.can_take_data = 1;
11668         chk->flags = 0;
11669         chk->asoc = &stcb->asoc;
11670         chk->send_size = sizeof(struct sctp_cwr_chunk);
11671         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11672         if (chk->data == NULL) {
11673                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11674                 return;
11675         }
11676         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11677         SCTP_BUF_LEN(chk->data) = chk->send_size;
11678         chk->sent = SCTP_DATAGRAM_UNSENT;
11679         chk->snd_count = 0;
11680         chk->whoTo = net;
11681         atomic_add_int(&chk->whoTo->ref_count, 1);
11682         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11683         cwr->ch.chunk_type = SCTP_ECN_CWR;
11684         cwr->ch.chunk_flags = override;
11685         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11686         cwr->tsn = htonl(high_tsn);
11687         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11688         asoc->ctrl_queue_cnt++;
11689 }
11690
11691 static int
11692 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11693     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11694 {
11695         uint16_t len, old_len, i;
11696         struct sctp_stream_reset_out_request *req_out;
11697         struct sctp_chunkhdr *ch;
11698         int at;
11699         int number_entries = 0;
11700
11701         ch = mtod(chk->data, struct sctp_chunkhdr *);
11702         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11703         /* get to new offset for the param. */
11704         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11705         /* now how long will this param be? */
11706         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11707                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11708                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11709                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11710                         number_entries++;
11711                 }
11712         }
11713         if (number_entries == 0) {
11714                 return (0);
11715         }
11716         if (number_entries == stcb->asoc.streamoutcnt) {
11717                 number_entries = 0;
11718         }
11719         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11720                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11721         }
11722         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11723         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11724         req_out->ph.param_length = htons(len);
11725         req_out->request_seq = htonl(seq);
11726         req_out->response_seq = htonl(resp_seq);
11727         req_out->send_reset_at_tsn = htonl(last_sent);
11728         at = 0;
11729         if (number_entries) {
11730                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11731                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11732                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11733                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11734                                 req_out->list_of_streams[at] = htons(i);
11735                                 at++;
11736                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11737                                 if (at >= number_entries) {
11738                                         break;
11739                                 }
11740                         }
11741                 }
11742         } else {
11743                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11744                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11745                 }
11746         }
11747         if (SCTP_SIZE32(len) > len) {
11748                 /*-
11749                  * Need to worry about the pad we may end up adding to the
11750                  * end. This is easy since the struct is either aligned to 4
11751                  * bytes or 2 bytes off.
11752                  */
11753                 req_out->list_of_streams[number_entries] = 0;
11754         }
11755         /* now fix the chunk length */
11756         ch->chunk_length = htons(len + old_len);
11757         chk->book_size = len + old_len;
11758         chk->book_size_scale = 0;
11759         chk->send_size = SCTP_SIZE32(chk->book_size);
11760         SCTP_BUF_LEN(chk->data) = chk->send_size;
11761         return (1);
11762 }
11763
11764 static void
11765 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11766     int number_entries, uint16_t *list,
11767     uint32_t seq)
11768 {
11769         uint16_t len, old_len, i;
11770         struct sctp_stream_reset_in_request *req_in;
11771         struct sctp_chunkhdr *ch;
11772
11773         ch = mtod(chk->data, struct sctp_chunkhdr *);
11774         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11775
11776         /* get to new offset for the param. */
11777         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11778         /* now how long will this param be? */
11779         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11780         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11781         req_in->ph.param_length = htons(len);
11782         req_in->request_seq = htonl(seq);
11783         if (number_entries) {
11784                 for (i = 0; i < number_entries; i++) {
11785                         req_in->list_of_streams[i] = htons(list[i]);
11786                 }
11787         }
11788         if (SCTP_SIZE32(len) > len) {
11789                 /*-
11790                  * Need to worry about the pad we may end up adding to the
11791                  * end. This is easy since the struct is either aligned to 4
11792                  * bytes or 2 bytes off.
11793                  */
11794                 req_in->list_of_streams[number_entries] = 0;
11795         }
11796         /* now fix the chunk length */
11797         ch->chunk_length = htons(len + old_len);
11798         chk->book_size = len + old_len;
11799         chk->book_size_scale = 0;
11800         chk->send_size = SCTP_SIZE32(chk->book_size);
11801         SCTP_BUF_LEN(chk->data) = chk->send_size;
11802         return;
11803 }
11804
11805 static void
11806 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11807     uint32_t seq)
11808 {
11809         uint16_t len, old_len;
11810         struct sctp_stream_reset_tsn_request *req_tsn;
11811         struct sctp_chunkhdr *ch;
11812
11813         ch = mtod(chk->data, struct sctp_chunkhdr *);
11814         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11815
11816         /* get to new offset for the param. */
11817         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11818         /* now how long will this param be? */
11819         len = sizeof(struct sctp_stream_reset_tsn_request);
11820         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11821         req_tsn->ph.param_length = htons(len);
11822         req_tsn->request_seq = htonl(seq);
11823
11824         /* now fix the chunk length */
11825         ch->chunk_length = htons(len + old_len);
11826         chk->send_size = len + old_len;
11827         chk->book_size = SCTP_SIZE32(chk->send_size);
11828         chk->book_size_scale = 0;
11829         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11830         return;
11831 }
11832
11833 void
11834 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11835     uint32_t resp_seq, uint32_t result)
11836 {
11837         uint16_t len, old_len;
11838         struct sctp_stream_reset_response *resp;
11839         struct sctp_chunkhdr *ch;
11840
11841         ch = mtod(chk->data, struct sctp_chunkhdr *);
11842         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11843
11844         /* get to new offset for the param. */
11845         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11846         /* now how long will this param be? */
11847         len = sizeof(struct sctp_stream_reset_response);
11848         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11849         resp->ph.param_length = htons(len);
11850         resp->response_seq = htonl(resp_seq);
11851         resp->result = ntohl(result);
11852
11853         /* now fix the chunk length */
11854         ch->chunk_length = htons(len + old_len);
11855         chk->book_size = len + old_len;
11856         chk->book_size_scale = 0;
11857         chk->send_size = SCTP_SIZE32(chk->book_size);
11858         SCTP_BUF_LEN(chk->data) = chk->send_size;
11859         return;
11860 }
11861
11862 void
11863 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11864     struct sctp_stream_reset_list *ent,
11865     int response)
11866 {
11867         struct sctp_association *asoc;
11868         struct sctp_tmit_chunk *chk;
11869         struct sctp_chunkhdr *ch;
11870
11871         asoc = &stcb->asoc;
11872
11873         /*
11874          * Reset our last reset action to the new one IP -> response
11875          * (PERFORMED probably). This assures that if we fail to send, a
11876          * retran from the peer will get the new response.
11877          */
11878         asoc->last_reset_action[0] = response;
11879         if (asoc->stream_reset_outstanding) {
11880                 return;
11881         }
11882         sctp_alloc_a_chunk(stcb, chk);
11883         if (chk == NULL) {
11884                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11885                 return;
11886         }
11887         chk->copy_by_ref = 0;
11888         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11889         chk->rec.chunk_id.can_take_data = 0;
11890         chk->flags = 0;
11891         chk->asoc = &stcb->asoc;
11892         chk->book_size = sizeof(struct sctp_chunkhdr);
11893         chk->send_size = SCTP_SIZE32(chk->book_size);
11894         chk->book_size_scale = 0;
11895         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11896         if (chk->data == NULL) {
11897                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11898                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11899                 return;
11900         }
11901         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11902         /* setup chunk parameters */
11903         chk->sent = SCTP_DATAGRAM_UNSENT;
11904         chk->snd_count = 0;
11905         if (stcb->asoc.alternate) {
11906                 chk->whoTo = stcb->asoc.alternate;
11907         } else {
11908                 chk->whoTo = stcb->asoc.primary_destination;
11909         }
11910         ch = mtod(chk->data, struct sctp_chunkhdr *);
11911         ch->chunk_type = SCTP_STREAM_RESET;
11912         ch->chunk_flags = 0;
11913         ch->chunk_length = htons(chk->book_size);
11914         atomic_add_int(&chk->whoTo->ref_count, 1);
11915         SCTP_BUF_LEN(chk->data) = chk->send_size;
11916         sctp_add_stream_reset_result(chk, ent->seq, response);
11917         /* insert the chunk for sending */
11918         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11919             chk,
11920             sctp_next);
11921         asoc->ctrl_queue_cnt++;
11922 }
11923
11924 void
11925 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11926     uint32_t resp_seq, uint32_t result,
11927     uint32_t send_una, uint32_t recv_next)
11928 {
11929         uint16_t len, old_len;
11930         struct sctp_stream_reset_response_tsn *resp;
11931         struct sctp_chunkhdr *ch;
11932
11933         ch = mtod(chk->data, struct sctp_chunkhdr *);
11934         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11935
11936         /* get to new offset for the param. */
11937         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11938         /* now how long will this param be? */
11939         len = sizeof(struct sctp_stream_reset_response_tsn);
11940         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11941         resp->ph.param_length = htons(len);
11942         resp->response_seq = htonl(resp_seq);
11943         resp->result = htonl(result);
11944         resp->senders_next_tsn = htonl(send_una);
11945         resp->receivers_next_tsn = htonl(recv_next);
11946
11947         /* now fix the chunk length */
11948         ch->chunk_length = htons(len + old_len);
11949         chk->book_size = len + old_len;
11950         chk->send_size = SCTP_SIZE32(chk->book_size);
11951         chk->book_size_scale = 0;
11952         SCTP_BUF_LEN(chk->data) = chk->send_size;
11953         return;
11954 }
11955
11956 static void
11957 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11958     uint32_t seq,
11959     uint16_t adding)
11960 {
11961         uint16_t len, old_len;
11962         struct sctp_chunkhdr *ch;
11963         struct sctp_stream_reset_add_strm *addstr;
11964
11965         ch = mtod(chk->data, struct sctp_chunkhdr *);
11966         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11967
11968         /* get to new offset for the param. */
11969         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11970         /* now how long will this param be? */
11971         len = sizeof(struct sctp_stream_reset_add_strm);
11972
11973         /* Fill it out. */
11974         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11975         addstr->ph.param_length = htons(len);
11976         addstr->request_seq = htonl(seq);
11977         addstr->number_of_streams = htons(adding);
11978         addstr->reserved = 0;
11979
11980         /* now fix the chunk length */
11981         ch->chunk_length = htons(len + old_len);
11982         chk->send_size = len + old_len;
11983         chk->book_size = SCTP_SIZE32(chk->send_size);
11984         chk->book_size_scale = 0;
11985         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11986         return;
11987 }
11988
11989 static void
11990 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11991     uint32_t seq,
11992     uint16_t adding)
11993 {
11994         uint16_t len, old_len;
11995         struct sctp_chunkhdr *ch;
11996         struct sctp_stream_reset_add_strm *addstr;
11997
11998         ch = mtod(chk->data, struct sctp_chunkhdr *);
11999         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12000
12001         /* get to new offset for the param. */
12002         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12003         /* now how long will this param be? */
12004         len = sizeof(struct sctp_stream_reset_add_strm);
12005         /* Fill it out. */
12006         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12007         addstr->ph.param_length = htons(len);
12008         addstr->request_seq = htonl(seq);
12009         addstr->number_of_streams = htons(adding);
12010         addstr->reserved = 0;
12011
12012         /* now fix the chunk length */
12013         ch->chunk_length = htons(len + old_len);
12014         chk->send_size = len + old_len;
12015         chk->book_size = SCTP_SIZE32(chk->send_size);
12016         chk->book_size_scale = 0;
12017         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12018         return;
12019 }
12020
12021 int
12022 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12023 {
12024         struct sctp_association *asoc;
12025         struct sctp_tmit_chunk *chk;
12026         struct sctp_chunkhdr *ch;
12027         uint32_t seq;
12028
12029         asoc = &stcb->asoc;
12030         asoc->trigger_reset = 0;
12031         if (asoc->stream_reset_outstanding) {
12032                 return (EALREADY);
12033         }
12034         sctp_alloc_a_chunk(stcb, chk);
12035         if (chk == NULL) {
12036                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12037                 return (ENOMEM);
12038         }
12039         chk->copy_by_ref = 0;
12040         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12041         chk->rec.chunk_id.can_take_data = 0;
12042         chk->flags = 0;
12043         chk->asoc = &stcb->asoc;
12044         chk->book_size = sizeof(struct sctp_chunkhdr);
12045         chk->send_size = SCTP_SIZE32(chk->book_size);
12046         chk->book_size_scale = 0;
12047         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12048         if (chk->data == NULL) {
12049                 sctp_free_a_chunk(stcb, chk, so_locked);
12050                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12051                 return (ENOMEM);
12052         }
12053         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12054
12055         /* setup chunk parameters */
12056         chk->sent = SCTP_DATAGRAM_UNSENT;
12057         chk->snd_count = 0;
12058         if (stcb->asoc.alternate) {
12059                 chk->whoTo = stcb->asoc.alternate;
12060         } else {
12061                 chk->whoTo = stcb->asoc.primary_destination;
12062         }
12063         ch = mtod(chk->data, struct sctp_chunkhdr *);
12064         ch->chunk_type = SCTP_STREAM_RESET;
12065         ch->chunk_flags = 0;
12066         ch->chunk_length = htons(chk->book_size);
12067         atomic_add_int(&chk->whoTo->ref_count, 1);
12068         SCTP_BUF_LEN(chk->data) = chk->send_size;
12069         seq = stcb->asoc.str_reset_seq_out;
12070         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12071                 seq++;
12072                 asoc->stream_reset_outstanding++;
12073         } else {
12074                 m_freem(chk->data);
12075                 chk->data = NULL;
12076                 sctp_free_a_chunk(stcb, chk, so_locked);
12077                 return (ENOENT);
12078         }
12079         asoc->str_reset = chk;
12080         /* insert the chunk for sending */
12081         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12082             chk,
12083             sctp_next);
12084         asoc->ctrl_queue_cnt++;
12085
12086         if (stcb->asoc.send_sack) {
12087                 sctp_send_sack(stcb, so_locked);
12088         }
12089         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12090         return (0);
12091 }
12092
12093 int
12094 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12095     uint16_t number_entries, uint16_t *list,
12096     uint8_t send_in_req,
12097     uint8_t send_tsn_req,
12098     uint8_t add_stream,
12099     uint16_t adding_o,
12100     uint16_t adding_i, uint8_t peer_asked)
12101 {
12102         struct sctp_association *asoc;
12103         struct sctp_tmit_chunk *chk;
12104         struct sctp_chunkhdr *ch;
12105         int can_send_out_req = 0;
12106         uint32_t seq;
12107
12108         asoc = &stcb->asoc;
12109         if (asoc->stream_reset_outstanding) {
12110                 /*-
12111                  * Already one pending, must get ACK back to clear the flag.
12112                  */
12113                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12114                 return (EBUSY);
12115         }
12116         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12117             (add_stream == 0)) {
12118                 /* nothing to do */
12119                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12120                 return (EINVAL);
12121         }
12122         if (send_tsn_req && send_in_req) {
12123                 /* error, can't do that */
12124                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12125                 return (EINVAL);
12126         } else if (send_in_req) {
12127                 can_send_out_req = 1;
12128         }
12129         if (number_entries > (MCLBYTES -
12130             SCTP_MIN_OVERHEAD -
12131             sizeof(struct sctp_chunkhdr) -
12132             sizeof(struct sctp_stream_reset_out_request)) /
12133             sizeof(uint16_t)) {
12134                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12135                 return (ENOMEM);
12136         }
12137         sctp_alloc_a_chunk(stcb, chk);
12138         if (chk == NULL) {
12139                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12140                 return (ENOMEM);
12141         }
12142         chk->copy_by_ref = 0;
12143         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12144         chk->rec.chunk_id.can_take_data = 0;
12145         chk->flags = 0;
12146         chk->asoc = &stcb->asoc;
12147         chk->book_size = sizeof(struct sctp_chunkhdr);
12148         chk->send_size = SCTP_SIZE32(chk->book_size);
12149         chk->book_size_scale = 0;
12150
12151         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12152         if (chk->data == NULL) {
12153                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12154                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12155                 return (ENOMEM);
12156         }
12157         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12158
12159         /* setup chunk parameters */
12160         chk->sent = SCTP_DATAGRAM_UNSENT;
12161         chk->snd_count = 0;
12162         if (stcb->asoc.alternate) {
12163                 chk->whoTo = stcb->asoc.alternate;
12164         } else {
12165                 chk->whoTo = stcb->asoc.primary_destination;
12166         }
12167         atomic_add_int(&chk->whoTo->ref_count, 1);
12168         ch = mtod(chk->data, struct sctp_chunkhdr *);
12169         ch->chunk_type = SCTP_STREAM_RESET;
12170         ch->chunk_flags = 0;
12171         ch->chunk_length = htons(chk->book_size);
12172         SCTP_BUF_LEN(chk->data) = chk->send_size;
12173
12174         seq = stcb->asoc.str_reset_seq_out;
12175         if (can_send_out_req) {
12176                 int ret;
12177
12178                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12179                 if (ret) {
12180                         seq++;
12181                         asoc->stream_reset_outstanding++;
12182                 }
12183         }
12184         if ((add_stream & 1) &&
12185             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12186                 /* Need to allocate more */
12187                 struct sctp_stream_out *oldstream;
12188                 struct sctp_stream_queue_pending *sp, *nsp;
12189                 int i;
12190 #if defined(SCTP_DETAILED_STR_STATS)
12191                 int j;
12192 #endif
12193
12194                 oldstream = stcb->asoc.strmout;
12195                 /* get some more */
12196                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12197                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12198                     SCTP_M_STRMO);
12199                 if (stcb->asoc.strmout == NULL) {
12200                         uint8_t x;
12201
12202                         stcb->asoc.strmout = oldstream;
12203                         /* Turn off the bit */
12204                         x = add_stream & 0xfe;
12205                         add_stream = x;
12206                         goto skip_stuff;
12207                 }
12208                 /*
12209                  * Ok now we proceed with copying the old out stuff and
12210                  * initializing the new stuff.
12211                  */
12212                 SCTP_TCB_SEND_LOCK(stcb);
12213                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12214                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12215                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12216                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12217                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12218                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12219                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12220                         stcb->asoc.strmout[i].sid = i;
12221                         stcb->asoc.strmout[i].state = oldstream[i].state;
12222                         /* FIX ME FIX ME */
12223                         /*
12224                          * This should be a SS_COPY operation FIX ME STREAM
12225                          * SCHEDULER EXPERT
12226                          */
12227                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12228                         /* now anything on those queues? */
12229                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12230                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12231                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12232                         }
12233
12234                 }
12235                 /* now the new streams */
12236                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12237                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12238                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12239                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12240 #if defined(SCTP_DETAILED_STR_STATS)
12241                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12242                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12243                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12244                         }
12245 #else
12246                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12247                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12248 #endif
12249                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12250                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12251                         stcb->asoc.strmout[i].sid = i;
12252                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12253                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12254                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12255                 }
12256                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12257                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12258                 SCTP_TCB_SEND_UNLOCK(stcb);
12259         }
12260 skip_stuff:
12261         if ((add_stream & 1) && (adding_o > 0)) {
12262                 asoc->strm_pending_add_size = adding_o;
12263                 asoc->peer_req_out = peer_asked;
12264                 sctp_add_an_out_stream(chk, seq, adding_o);
12265                 seq++;
12266                 asoc->stream_reset_outstanding++;
12267         }
12268         if ((add_stream & 2) && (adding_i > 0)) {
12269                 sctp_add_an_in_stream(chk, seq, adding_i);
12270                 seq++;
12271                 asoc->stream_reset_outstanding++;
12272         }
12273         if (send_in_req) {
12274                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12275                 seq++;
12276                 asoc->stream_reset_outstanding++;
12277         }
12278         if (send_tsn_req) {
12279                 sctp_add_stream_reset_tsn(chk, seq);
12280                 asoc->stream_reset_outstanding++;
12281         }
12282         asoc->str_reset = chk;
12283         /* insert the chunk for sending */
12284         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12285             chk,
12286             sctp_next);
12287         asoc->ctrl_queue_cnt++;
12288         if (stcb->asoc.send_sack) {
12289                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12290         }
12291         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12292         return (0);
12293 }
12294
12295 void
12296 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12297     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12298     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12299     uint32_t vrf_id, uint16_t port)
12300 {
12301         /* Don't respond to an ABORT with an ABORT. */
12302         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12303                 if (cause)
12304                         sctp_m_freem(cause);
12305                 return;
12306         }
12307         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12308             mflowtype, mflowid, fibnum,
12309             vrf_id, port);
12310         return;
12311 }
12312
12313 void
12314 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12315     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12316     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12317     uint32_t vrf_id, uint16_t port)
12318 {
12319         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12320             mflowtype, mflowid, fibnum,
12321             vrf_id, port);
12322         return;
12323 }
12324
12325 static struct mbuf *
12326 sctp_copy_resume(struct uio *uio,
12327     int max_send_len,
12328     int user_marks_eor,
12329     int *error,
12330     uint32_t *sndout,
12331     struct mbuf **new_tail)
12332 {
12333         struct mbuf *m;
12334
12335         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12336             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12337         if (m == NULL) {
12338                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12339                 *error = ENOBUFS;
12340         } else {
12341                 *sndout = m_length(m, NULL);
12342                 *new_tail = m_last(m);
12343         }
12344         return (m);
12345 }
12346
12347 static int
12348 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12349     struct uio *uio,
12350     int resv_upfront)
12351 {
12352         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12353             resv_upfront, 0);
12354         if (sp->data == NULL) {
12355                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12356                 return (ENOBUFS);
12357         }
12358         sp->tail_mbuf = m_last(sp->data);
12359         return (0);
12360 }
12361
12362
12363
12364 static struct sctp_stream_queue_pending *
12365 sctp_copy_it_in(struct sctp_tcb *stcb,
12366     struct sctp_association *asoc,
12367     struct sctp_sndrcvinfo *srcv,
12368     struct uio *uio,
12369     struct sctp_nets *net,
12370     int max_send_len,
12371     int user_marks_eor,
12372     int *error)
12373 {
12374         /*-
12375          * This routine must be very careful in its work. Protocol
12376          * processing is up and running so care must be taken to spl...()
12377          * when you need to do something that may effect the stcb/asoc. The
12378          * sb is locked however. When data is copied the protocol processing
12379          * should be enabled since this is a slower operation...
12380          */
12381         struct sctp_stream_queue_pending *sp = NULL;
12382         int resv_in_first;
12383
12384         *error = 0;
12385         /* Now can we send this? */
12386         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12387             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12388             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12389             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12390                 /* got data while shutting down */
12391                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12392                 *error = ECONNRESET;
12393                 goto out_now;
12394         }
12395         sctp_alloc_a_strmoq(stcb, sp);
12396         if (sp == NULL) {
12397                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12398                 *error = ENOMEM;
12399                 goto out_now;
12400         }
12401         sp->act_flags = 0;
12402         sp->sender_all_done = 0;
12403         sp->sinfo_flags = srcv->sinfo_flags;
12404         sp->timetolive = srcv->sinfo_timetolive;
12405         sp->ppid = srcv->sinfo_ppid;
12406         sp->context = srcv->sinfo_context;
12407         sp->fsn = 0;
12408         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12409
12410         sp->sid = srcv->sinfo_stream;
12411         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12412         if ((sp->length == (uint32_t)uio->uio_resid) &&
12413             ((user_marks_eor == 0) ||
12414             (srcv->sinfo_flags & SCTP_EOF) ||
12415             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12416                 sp->msg_is_complete = 1;
12417         } else {
12418                 sp->msg_is_complete = 0;
12419         }
12420         sp->sender_all_done = 0;
12421         sp->some_taken = 0;
12422         sp->put_last_out = 0;
12423         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12424         sp->data = sp->tail_mbuf = NULL;
12425         if (sp->length == 0) {
12426                 goto skip_copy;
12427         }
12428         if (srcv->sinfo_keynumber_valid) {
12429                 sp->auth_keyid = srcv->sinfo_keynumber;
12430         } else {
12431                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12432         }
12433         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12434                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12435                 sp->holds_key_ref = 1;
12436         }
12437         *error = sctp_copy_one(sp, uio, resv_in_first);
12438 skip_copy:
12439         if (*error) {
12440                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12441                 sp = NULL;
12442         } else {
12443                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12444                         sp->net = net;
12445                         atomic_add_int(&sp->net->ref_count, 1);
12446                 } else {
12447                         sp->net = NULL;
12448                 }
12449                 sctp_set_prsctp_policy(sp);
12450         }
12451 out_now:
12452         return (sp);
12453 }
12454
12455
12456 int
12457 sctp_sosend(struct socket *so,
12458     struct sockaddr *addr,
12459     struct uio *uio,
12460     struct mbuf *top,
12461     struct mbuf *control,
12462     int flags,
12463     struct thread *p
12464 )
12465 {
12466         int error, use_sndinfo = 0;
12467         struct sctp_sndrcvinfo sndrcvninfo;
12468         struct sockaddr *addr_to_use;
12469 #if defined(INET) && defined(INET6)
12470         struct sockaddr_in sin;
12471 #endif
12472
12473         if (control) {
12474                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12475                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12476                     sizeof(sndrcvninfo))) {
12477                         /* got one */
12478                         use_sndinfo = 1;
12479                 }
12480         }
12481         addr_to_use = addr;
12482 #if defined(INET) && defined(INET6)
12483         if ((addr) && (addr->sa_family == AF_INET6)) {
12484                 struct sockaddr_in6 *sin6;
12485
12486                 sin6 = (struct sockaddr_in6 *)addr;
12487                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12488                         in6_sin6_2_sin(&sin, sin6);
12489                         addr_to_use = (struct sockaddr *)&sin;
12490                 }
12491         }
12492 #endif
12493         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12494             control,
12495             flags,
12496             use_sndinfo ? &sndrcvninfo : NULL
12497             ,p
12498             );
12499         return (error);
12500 }
12501
12502
12503 int
12504 sctp_lower_sosend(struct socket *so,
12505     struct sockaddr *addr,
12506     struct uio *uio,
12507     struct mbuf *i_pak,
12508     struct mbuf *control,
12509     int flags,
12510     struct sctp_sndrcvinfo *srcv
12511     ,
12512     struct thread *p
12513 )
12514 {
12515         unsigned int sndlen = 0, max_len;
12516         int error, len;
12517         struct mbuf *top = NULL;
12518         int queue_only = 0, queue_only_for_init = 0;
12519         int free_cnt_applied = 0;
12520         int un_sent;
12521         int now_filled = 0;
12522         unsigned int inqueue_bytes = 0;
12523         struct sctp_block_entry be;
12524         struct sctp_inpcb *inp;
12525         struct sctp_tcb *stcb = NULL;
12526         struct timeval now;
12527         struct sctp_nets *net;
12528         struct sctp_association *asoc;
12529         struct sctp_inpcb *t_inp;
12530         int user_marks_eor;
12531         int create_lock_applied = 0;
12532         int nagle_applies = 0;
12533         int some_on_control = 0;
12534         int got_all_of_the_send = 0;
12535         int hold_tcblock = 0;
12536         int non_blocking = 0;
12537         uint32_t local_add_more, local_soresv = 0;
12538         uint16_t port;
12539         uint16_t sinfo_flags;
12540         sctp_assoc_t sinfo_assoc_id;
12541
12542         error = 0;
12543         net = NULL;
12544         stcb = NULL;
12545         asoc = NULL;
12546
12547         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12548         if (inp == NULL) {
12549                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12550                 error = EINVAL;
12551                 if (i_pak) {
12552                         SCTP_RELEASE_PKT(i_pak);
12553                 }
12554                 return (error);
12555         }
12556         if ((uio == NULL) && (i_pak == NULL)) {
12557                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12558                 return (EINVAL);
12559         }
12560         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12561         atomic_add_int(&inp->total_sends, 1);
12562         if (uio) {
12563                 if (uio->uio_resid < 0) {
12564                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12565                         return (EINVAL);
12566                 }
12567                 sndlen = (unsigned int)uio->uio_resid;
12568         } else {
12569                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12570                 sndlen = SCTP_HEADER_LEN(i_pak);
12571         }
12572         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12573             (void *)addr,
12574             sndlen);
12575         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12576             SCTP_IS_LISTENING(inp)) {
12577                 /* The listener can NOT send */
12578                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12579                 error = ENOTCONN;
12580                 goto out_unlocked;
12581         }
12582         /**
12583          * Pre-screen address, if one is given the sin-len
12584          * must be set correctly!
12585          */
12586         if (addr) {
12587                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12588
12589                 switch (raddr->sa.sa_family) {
12590 #ifdef INET
12591                 case AF_INET:
12592                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12593                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12594                                 error = EINVAL;
12595                                 goto out_unlocked;
12596                         }
12597                         port = raddr->sin.sin_port;
12598                         break;
12599 #endif
12600 #ifdef INET6
12601                 case AF_INET6:
12602                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12603                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12604                                 error = EINVAL;
12605                                 goto out_unlocked;
12606                         }
12607                         port = raddr->sin6.sin6_port;
12608                         break;
12609 #endif
12610                 default:
12611                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12612                         error = EAFNOSUPPORT;
12613                         goto out_unlocked;
12614                 }
12615         } else
12616                 port = 0;
12617
12618         if (srcv) {
12619                 sinfo_flags = srcv->sinfo_flags;
12620                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12621                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12622                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12623                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12624                         error = EINVAL;
12625                         goto out_unlocked;
12626                 }
12627                 if (srcv->sinfo_flags)
12628                         SCTP_STAT_INCR(sctps_sends_with_flags);
12629         } else {
12630                 sinfo_flags = inp->def_send.sinfo_flags;
12631                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12632         }
12633         if (sinfo_flags & SCTP_SENDALL) {
12634                 /* its a sendall */
12635                 error = sctp_sendall(inp, uio, top, srcv);
12636                 top = NULL;
12637                 goto out_unlocked;
12638         }
12639         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12640                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12641                 error = EINVAL;
12642                 goto out_unlocked;
12643         }
12644         /* now we must find the assoc */
12645         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12646             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12647                 SCTP_INP_RLOCK(inp);
12648                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12649                 if (stcb) {
12650                         SCTP_TCB_LOCK(stcb);
12651                         hold_tcblock = 1;
12652                 }
12653                 SCTP_INP_RUNLOCK(inp);
12654         } else if (sinfo_assoc_id) {
12655                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12656                 if (stcb != NULL) {
12657                         hold_tcblock = 1;
12658                 }
12659         } else if (addr) {
12660                 /*-
12661                  * Since we did not use findep we must
12662                  * increment it, and if we don't find a tcb
12663                  * decrement it.
12664                  */
12665                 SCTP_INP_WLOCK(inp);
12666                 SCTP_INP_INCR_REF(inp);
12667                 SCTP_INP_WUNLOCK(inp);
12668                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12669                 if (stcb == NULL) {
12670                         SCTP_INP_WLOCK(inp);
12671                         SCTP_INP_DECR_REF(inp);
12672                         SCTP_INP_WUNLOCK(inp);
12673                 } else {
12674                         hold_tcblock = 1;
12675                 }
12676         }
12677         if ((stcb == NULL) && (addr)) {
12678                 /* Possible implicit send? */
12679                 SCTP_ASOC_CREATE_LOCK(inp);
12680                 create_lock_applied = 1;
12681                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12682                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12683                         /* Should I really unlock ? */
12684                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12685                         error = EINVAL;
12686                         goto out_unlocked;
12687
12688                 }
12689                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12690                     (addr->sa_family == AF_INET6)) {
12691                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12692                         error = EINVAL;
12693                         goto out_unlocked;
12694                 }
12695                 SCTP_INP_WLOCK(inp);
12696                 SCTP_INP_INCR_REF(inp);
12697                 SCTP_INP_WUNLOCK(inp);
12698                 /* With the lock applied look again */
12699                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12700                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12701                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12702                 }
12703                 if (stcb == NULL) {
12704                         SCTP_INP_WLOCK(inp);
12705                         SCTP_INP_DECR_REF(inp);
12706                         SCTP_INP_WUNLOCK(inp);
12707                 } else {
12708                         hold_tcblock = 1;
12709                 }
12710                 if (error) {
12711                         goto out_unlocked;
12712                 }
12713                 if (t_inp != inp) {
12714                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12715                         error = ENOTCONN;
12716                         goto out_unlocked;
12717                 }
12718         }
12719         if (stcb == NULL) {
12720                 if (addr == NULL) {
12721                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12722                         error = ENOENT;
12723                         goto out_unlocked;
12724                 } else {
12725                         /* We must go ahead and start the INIT process */
12726                         uint32_t vrf_id;
12727
12728                         if ((sinfo_flags & SCTP_ABORT) ||
12729                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12730                                 /*-
12731                                  * User asks to abort a non-existant assoc,
12732                                  * or EOF a non-existant assoc with no data
12733                                  */
12734                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12735                                 error = ENOENT;
12736                                 goto out_unlocked;
12737                         }
12738                         /* get an asoc/stcb struct */
12739                         vrf_id = inp->def_vrf_id;
12740 #ifdef INVARIANTS
12741                         if (create_lock_applied == 0) {
12742                                 panic("Error, should hold create lock and I don't?");
12743                         }
12744 #endif
12745                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12746                             inp->sctp_ep.pre_open_stream_count,
12747                             inp->sctp_ep.port,
12748                             p);
12749                         if (stcb == NULL) {
12750                                 /* Error is setup for us in the call */
12751                                 goto out_unlocked;
12752                         }
12753                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12754                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12755                                 /*
12756                                  * Set the connected flag so we can queue
12757                                  * data
12758                                  */
12759                                 soisconnecting(so);
12760                         }
12761                         hold_tcblock = 1;
12762                         if (create_lock_applied) {
12763                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12764                                 create_lock_applied = 0;
12765                         } else {
12766                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12767                         }
12768                         /*
12769                          * Turn on queue only flag to prevent data from
12770                          * being sent
12771                          */
12772                         queue_only = 1;
12773                         asoc = &stcb->asoc;
12774                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12775                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12776
12777                         /* initialize authentication params for the assoc */
12778                         sctp_initialize_auth_params(inp, stcb);
12779
12780                         if (control) {
12781                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12782                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12783                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12784                                         hold_tcblock = 0;
12785                                         stcb = NULL;
12786                                         goto out_unlocked;
12787                                 }
12788                         }
12789                         /* out with the INIT */
12790                         queue_only_for_init = 1;
12791                         /*-
12792                          * we may want to dig in after this call and adjust the MTU
12793                          * value. It defaulted to 1500 (constant) but the ro
12794                          * structure may now have an update and thus we may need to
12795                          * change it BEFORE we append the message.
12796                          */
12797                 }
12798         } else
12799                 asoc = &stcb->asoc;
12800         if (srcv == NULL)
12801                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12802         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12803                 if (addr)
12804                         net = sctp_findnet(stcb, addr);
12805                 else
12806                         net = NULL;
12807                 if ((net == NULL) ||
12808                     ((port != 0) && (port != stcb->rport))) {
12809                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12810                         error = EINVAL;
12811                         goto out_unlocked;
12812                 }
12813         } else {
12814                 if (stcb->asoc.alternate) {
12815                         net = stcb->asoc.alternate;
12816                 } else {
12817                         net = stcb->asoc.primary_destination;
12818                 }
12819         }
12820         atomic_add_int(&stcb->total_sends, 1);
12821         /* Keep the stcb from being freed under our feet */
12822         atomic_add_int(&asoc->refcnt, 1);
12823         free_cnt_applied = 1;
12824
12825         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12826                 if (sndlen > asoc->smallest_mtu) {
12827                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12828                         error = EMSGSIZE;
12829                         goto out_unlocked;
12830                 }
12831         }
12832         if (SCTP_SO_IS_NBIO(so)
12833             || (flags & MSG_NBIO)
12834             ) {
12835                 non_blocking = 1;
12836         }
12837         /* would we block? */
12838         if (non_blocking) {
12839                 uint32_t amount;
12840
12841                 if (hold_tcblock == 0) {
12842                         SCTP_TCB_LOCK(stcb);
12843                         hold_tcblock = 1;
12844                 }
12845                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12846                 if (user_marks_eor == 0) {
12847                         amount = sndlen;
12848                 } else {
12849                         amount = 1;
12850                 }
12851                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12852                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12853                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12854                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12855                                 error = EMSGSIZE;
12856                         else
12857                                 error = EWOULDBLOCK;
12858                         goto out_unlocked;
12859                 }
12860                 stcb->asoc.sb_send_resv += sndlen;
12861                 SCTP_TCB_UNLOCK(stcb);
12862                 hold_tcblock = 0;
12863         } else {
12864                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12865         }
12866         local_soresv = sndlen;
12867         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12868                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12869                 error = ECONNRESET;
12870                 goto out_unlocked;
12871         }
12872         if (create_lock_applied) {
12873                 SCTP_ASOC_CREATE_UNLOCK(inp);
12874                 create_lock_applied = 0;
12875         }
12876         /* Is the stream no. valid? */
12877         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12878                 /* Invalid stream number */
12879                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12880                 error = EINVAL;
12881                 goto out_unlocked;
12882         }
12883         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12884             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12885                 /*
12886                  * Can't queue any data while stream reset is underway.
12887                  */
12888                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12889                         error = EAGAIN;
12890                 } else {
12891                         error = EINVAL;
12892                 }
12893                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12894                 goto out_unlocked;
12895         }
12896         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12897             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12898                 queue_only = 1;
12899         }
12900         /* we are now done with all control */
12901         if (control) {
12902                 sctp_m_freem(control);
12903                 control = NULL;
12904         }
12905         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12906             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12907             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12908             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12909                 if (srcv->sinfo_flags & SCTP_ABORT) {
12910                         ;
12911                 } else {
12912                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12913                         error = ECONNRESET;
12914                         goto out_unlocked;
12915                 }
12916         }
12917         /* Ok, we will attempt a msgsnd :> */
12918         if (p) {
12919                 p->td_ru.ru_msgsnd++;
12920         }
12921         /* Are we aborting? */
12922         if (srcv->sinfo_flags & SCTP_ABORT) {
12923                 struct mbuf *mm;
12924                 int tot_demand, tot_out = 0, max_out;
12925
12926                 SCTP_STAT_INCR(sctps_sends_with_abort);
12927                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12928                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12929                         /* It has to be up before we abort */
12930                         /* how big is the user initiated abort? */
12931                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12932                         error = EINVAL;
12933                         goto out;
12934                 }
12935                 if (hold_tcblock) {
12936                         SCTP_TCB_UNLOCK(stcb);
12937                         hold_tcblock = 0;
12938                 }
12939                 if (top) {
12940                         struct mbuf *cntm = NULL;
12941
12942                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12943                         if (sndlen != 0) {
12944                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12945                                         tot_out += SCTP_BUF_LEN(cntm);
12946                                 }
12947                         }
12948                 } else {
12949                         /* Must fit in a MTU */
12950                         tot_out = sndlen;
12951                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12952                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12953                                 /* To big */
12954                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12955                                 error = EMSGSIZE;
12956                                 goto out;
12957                         }
12958                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12959                 }
12960                 if (mm == NULL) {
12961                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12962                         error = ENOMEM;
12963                         goto out;
12964                 }
12965                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12966                 max_out -= sizeof(struct sctp_abort_msg);
12967                 if (tot_out > max_out) {
12968                         tot_out = max_out;
12969                 }
12970                 if (mm) {
12971                         struct sctp_paramhdr *ph;
12972
12973                         /* now move forward the data pointer */
12974                         ph = mtod(mm, struct sctp_paramhdr *);
12975                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12976                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12977                         ph++;
12978                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12979                         if (top == NULL) {
12980                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12981                                 if (error) {
12982                                         /*-
12983                                          * Here if we can't get his data we
12984                                          * still abort we just don't get to
12985                                          * send the users note :-0
12986                                          */
12987                                         sctp_m_freem(mm);
12988                                         mm = NULL;
12989                                 }
12990                         } else {
12991                                 if (sndlen != 0) {
12992                                         SCTP_BUF_NEXT(mm) = top;
12993                                 }
12994                         }
12995                 }
12996                 if (hold_tcblock == 0) {
12997                         SCTP_TCB_LOCK(stcb);
12998                 }
12999                 atomic_add_int(&stcb->asoc.refcnt, -1);
13000                 free_cnt_applied = 0;
13001                 /* release this lock, otherwise we hang on ourselves */
13002                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13003                 /* now relock the stcb so everything is sane */
13004                 hold_tcblock = 0;
13005                 stcb = NULL;
13006                 /*
13007                  * In this case top is already chained to mm avoid double
13008                  * free, since we free it below if top != NULL and driver
13009                  * would free it after sending the packet out
13010                  */
13011                 if (sndlen != 0) {
13012                         top = NULL;
13013                 }
13014                 goto out_unlocked;
13015         }
13016         /* Calculate the maximum we can send */
13017         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13018         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13019                 if (non_blocking) {
13020                         /* we already checked for non-blocking above. */
13021                         max_len = sndlen;
13022                 } else {
13023                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13024                 }
13025         } else {
13026                 max_len = 0;
13027         }
13028         if (hold_tcblock) {
13029                 SCTP_TCB_UNLOCK(stcb);
13030                 hold_tcblock = 0;
13031         }
13032         if (asoc->strmout == NULL) {
13033                 /* huh? software error */
13034                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13035                 error = EFAULT;
13036                 goto out_unlocked;
13037         }
13038         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13039         if ((user_marks_eor == 0) &&
13040             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13041                 /* It will NEVER fit */
13042                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13043                 error = EMSGSIZE;
13044                 goto out_unlocked;
13045         }
13046         if ((uio == NULL) && user_marks_eor) {
13047                 /*-
13048                  * We do not support eeor mode for
13049                  * sending with mbuf chains (like sendfile).
13050                  */
13051                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13052                 error = EINVAL;
13053                 goto out_unlocked;
13054         }
13055         if (user_marks_eor) {
13056                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13057         } else {
13058                 /*-
13059                  * For non-eeor the whole message must fit in
13060                  * the socket send buffer.
13061                  */
13062                 local_add_more = sndlen;
13063         }
13064         len = 0;
13065         if (non_blocking) {
13066                 goto skip_preblock;
13067         }
13068         if (((max_len <= local_add_more) &&
13069             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13070             (max_len == 0) ||
13071             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13072                 /* No room right now ! */
13073                 SOCKBUF_LOCK(&so->so_snd);
13074                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13075                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13076                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13077                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13078                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13079                             inqueue_bytes,
13080                             local_add_more,
13081                             stcb->asoc.stream_queue_cnt,
13082                             stcb->asoc.chunks_on_out_queue,
13083                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13084                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13085                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13086                         }
13087                         be.error = 0;
13088                         stcb->block_entry = &be;
13089                         error = sbwait(&so->so_snd);
13090                         stcb->block_entry = NULL;
13091                         if (error || so->so_error || be.error) {
13092                                 if (error == 0) {
13093                                         if (so->so_error)
13094                                                 error = so->so_error;
13095                                         if (be.error) {
13096                                                 error = be.error;
13097                                         }
13098                                 }
13099                                 SOCKBUF_UNLOCK(&so->so_snd);
13100                                 goto out_unlocked;
13101                         }
13102                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13103                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13104                                     asoc, stcb->asoc.total_output_queue_size);
13105                         }
13106                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13107                                 SOCKBUF_UNLOCK(&so->so_snd);
13108                                 goto out_unlocked;
13109                         }
13110                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13111                 }
13112                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13113                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13114                 } else {
13115                         max_len = 0;
13116                 }
13117                 SOCKBUF_UNLOCK(&so->so_snd);
13118         }
13119 skip_preblock:
13120         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13121                 goto out_unlocked;
13122         }
13123         /*
13124          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13125          * case NOTE: uio will be null when top/mbuf is passed
13126          */
13127         if (sndlen == 0) {
13128                 if (srcv->sinfo_flags & SCTP_EOF) {
13129                         got_all_of_the_send = 1;
13130                         goto dataless_eof;
13131                 } else {
13132                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13133                         error = EINVAL;
13134                         goto out;
13135                 }
13136         }
13137         if (top == NULL) {
13138                 struct sctp_stream_queue_pending *sp;
13139                 struct sctp_stream_out *strm;
13140                 uint32_t sndout;
13141
13142                 SCTP_TCB_SEND_LOCK(stcb);
13143                 if ((asoc->stream_locked) &&
13144                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13145                         SCTP_TCB_SEND_UNLOCK(stcb);
13146                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13147                         error = EINVAL;
13148                         goto out;
13149                 }
13150                 SCTP_TCB_SEND_UNLOCK(stcb);
13151
13152                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13153                 if (strm->last_msg_incomplete == 0) {
13154         do_a_copy_in:
13155                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13156                         if (error) {
13157                                 goto out;
13158                         }
13159                         SCTP_TCB_SEND_LOCK(stcb);
13160                         if (sp->msg_is_complete) {
13161                                 strm->last_msg_incomplete = 0;
13162                                 asoc->stream_locked = 0;
13163                         } else {
13164                                 /*
13165                                  * Just got locked to this guy in case of an
13166                                  * interrupt.
13167                                  */
13168                                 strm->last_msg_incomplete = 1;
13169                                 if (stcb->asoc.idata_supported == 0) {
13170                                         asoc->stream_locked = 1;
13171                                         asoc->stream_locked_on = srcv->sinfo_stream;
13172                                 }
13173                                 sp->sender_all_done = 0;
13174                         }
13175                         sctp_snd_sb_alloc(stcb, sp->length);
13176                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13177                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13178                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13179                         }
13180                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13181                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13182                         SCTP_TCB_SEND_UNLOCK(stcb);
13183                 } else {
13184                         SCTP_TCB_SEND_LOCK(stcb);
13185                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13186                         SCTP_TCB_SEND_UNLOCK(stcb);
13187                         if (sp == NULL) {
13188                                 /* ???? Huh ??? last msg is gone */
13189 #ifdef INVARIANTS
13190                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13191 #else
13192                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13193                                 strm->last_msg_incomplete = 0;
13194 #endif
13195                                 goto do_a_copy_in;
13196
13197                         }
13198                 }
13199                 while (uio->uio_resid > 0) {
13200                         /* How much room do we have? */
13201                         struct mbuf *new_tail, *mm;
13202
13203                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13204                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13205                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13206                         else
13207                                 max_len = 0;
13208
13209                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13210                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13211                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13212                                 sndout = 0;
13213                                 new_tail = NULL;
13214                                 if (hold_tcblock) {
13215                                         SCTP_TCB_UNLOCK(stcb);
13216                                         hold_tcblock = 0;
13217                                 }
13218                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13219                                 if ((mm == NULL) || error) {
13220                                         if (mm) {
13221                                                 sctp_m_freem(mm);
13222                                         }
13223                                         goto out;
13224                                 }
13225                                 /* Update the mbuf and count */
13226                                 SCTP_TCB_SEND_LOCK(stcb);
13227                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13228                                         /*
13229                                          * we need to get out. Peer probably
13230                                          * aborted.
13231                                          */
13232                                         sctp_m_freem(mm);
13233                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13234                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13235                                                 error = ECONNRESET;
13236                                         }
13237                                         SCTP_TCB_SEND_UNLOCK(stcb);
13238                                         goto out;
13239                                 }
13240                                 if (sp->tail_mbuf) {
13241                                         /* tack it to the end */
13242                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13243                                         sp->tail_mbuf = new_tail;
13244                                 } else {
13245                                         /* A stolen mbuf */
13246                                         sp->data = mm;
13247                                         sp->tail_mbuf = new_tail;
13248                                 }
13249                                 sctp_snd_sb_alloc(stcb, sndout);
13250                                 atomic_add_int(&sp->length, sndout);
13251                                 len += sndout;
13252                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13253                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13254                                 }
13255                                 /* Did we reach EOR? */
13256                                 if ((uio->uio_resid == 0) &&
13257                                     ((user_marks_eor == 0) ||
13258                                     (srcv->sinfo_flags & SCTP_EOF) ||
13259                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13260                                         sp->msg_is_complete = 1;
13261                                 } else {
13262                                         sp->msg_is_complete = 0;
13263                                 }
13264                                 SCTP_TCB_SEND_UNLOCK(stcb);
13265                         }
13266                         if (uio->uio_resid == 0) {
13267                                 /* got it all? */
13268                                 continue;
13269                         }
13270                         /* PR-SCTP? */
13271                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13272                                 /*
13273                                  * This is ugly but we must assure locking
13274                                  * order
13275                                  */
13276                                 if (hold_tcblock == 0) {
13277                                         SCTP_TCB_LOCK(stcb);
13278                                         hold_tcblock = 1;
13279                                 }
13280                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13281                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13282                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13283                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13284                                 else
13285                                         max_len = 0;
13286                                 if (max_len > 0) {
13287                                         continue;
13288                                 }
13289                                 SCTP_TCB_UNLOCK(stcb);
13290                                 hold_tcblock = 0;
13291                         }
13292                         /* wait for space now */
13293                         if (non_blocking) {
13294                                 /* Non-blocking io in place out */
13295                                 goto skip_out_eof;
13296                         }
13297                         /* What about the INIT, send it maybe */
13298                         if (queue_only_for_init) {
13299                                 if (hold_tcblock == 0) {
13300                                         SCTP_TCB_LOCK(stcb);
13301                                         hold_tcblock = 1;
13302                                 }
13303                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13304                                         /* a collision took us forward? */
13305                                         queue_only = 0;
13306                                 } else {
13307                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13308                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13309                                         queue_only = 1;
13310                                 }
13311                         }
13312                         if ((net->flight_size > net->cwnd) &&
13313                             (asoc->sctp_cmt_on_off == 0)) {
13314                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13315                                 queue_only = 1;
13316                         } else if (asoc->ifp_had_enobuf) {
13317                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13318                                 if (net->flight_size > (2 * net->mtu)) {
13319                                         queue_only = 1;
13320                                 }
13321                                 asoc->ifp_had_enobuf = 0;
13322                         }
13323                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13324                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13325                             (stcb->asoc.total_flight > 0) &&
13326                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13327                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13328
13329                                 /*-
13330                                  * Ok, Nagle is set on and we have data outstanding.
13331                                  * Don't send anything and let SACKs drive out the
13332                                  * data unless we have a "full" segment to send.
13333                                  */
13334                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13335                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13336                                 }
13337                                 SCTP_STAT_INCR(sctps_naglequeued);
13338                                 nagle_applies = 1;
13339                         } else {
13340                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13341                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13342                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13343                                 }
13344                                 SCTP_STAT_INCR(sctps_naglesent);
13345                                 nagle_applies = 0;
13346                         }
13347                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13348
13349                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13350                                     nagle_applies, un_sent);
13351                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13352                                     stcb->asoc.total_flight,
13353                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13354                         }
13355                         if (queue_only_for_init)
13356                                 queue_only_for_init = 0;
13357                         if ((queue_only == 0) && (nagle_applies == 0)) {
13358                                 /*-
13359                                  * need to start chunk output
13360                                  * before blocking.. note that if
13361                                  * a lock is already applied, then
13362                                  * the input via the net is happening
13363                                  * and I don't need to start output :-D
13364                                  */
13365                                 if (hold_tcblock == 0) {
13366                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13367                                                 hold_tcblock = 1;
13368                                                 sctp_chunk_output(inp,
13369                                                     stcb,
13370                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13371                                         }
13372                                 } else {
13373                                         sctp_chunk_output(inp,
13374                                             stcb,
13375                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13376                                 }
13377                                 if (hold_tcblock == 1) {
13378                                         SCTP_TCB_UNLOCK(stcb);
13379                                         hold_tcblock = 0;
13380                                 }
13381                         }
13382                         SOCKBUF_LOCK(&so->so_snd);
13383                         /*-
13384                          * This is a bit strange, but I think it will
13385                          * work. The total_output_queue_size is locked and
13386                          * protected by the TCB_LOCK, which we just released.
13387                          * There is a race that can occur between releasing it
13388                          * above, and me getting the socket lock, where sacks
13389                          * come in but we have not put the SB_WAIT on the
13390                          * so_snd buffer to get the wakeup. After the LOCK
13391                          * is applied the sack_processing will also need to
13392                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13393                          * once we have the socket buffer lock if we recheck the
13394                          * size we KNOW we will get to sleep safely with the
13395                          * wakeup flag in place.
13396                          */
13397                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13398                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13399                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13400                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13401                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13402                                             asoc, (size_t)uio->uio_resid);
13403                                 }
13404                                 be.error = 0;
13405                                 stcb->block_entry = &be;
13406                                 error = sbwait(&so->so_snd);
13407                                 stcb->block_entry = NULL;
13408
13409                                 if (error || so->so_error || be.error) {
13410                                         if (error == 0) {
13411                                                 if (so->so_error)
13412                                                         error = so->so_error;
13413                                                 if (be.error) {
13414                                                         error = be.error;
13415                                                 }
13416                                         }
13417                                         SOCKBUF_UNLOCK(&so->so_snd);
13418                                         goto out_unlocked;
13419                                 }
13420                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13421                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13422                                             asoc, stcb->asoc.total_output_queue_size);
13423                                 }
13424                         }
13425                         SOCKBUF_UNLOCK(&so->so_snd);
13426                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13427                                 goto out_unlocked;
13428                         }
13429                 }
13430                 SCTP_TCB_SEND_LOCK(stcb);
13431                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13432                         SCTP_TCB_SEND_UNLOCK(stcb);
13433                         goto out_unlocked;
13434                 }
13435                 if (sp) {
13436                         if (sp->msg_is_complete == 0) {
13437                                 strm->last_msg_incomplete = 1;
13438                                 if (stcb->asoc.idata_supported == 0) {
13439                                         asoc->stream_locked = 1;
13440                                         asoc->stream_locked_on = srcv->sinfo_stream;
13441                                 }
13442                         } else {
13443                                 sp->sender_all_done = 1;
13444                                 strm->last_msg_incomplete = 0;
13445                                 asoc->stream_locked = 0;
13446                         }
13447                 } else {
13448                         SCTP_PRINTF("Huh no sp TSNH?\n");
13449                         strm->last_msg_incomplete = 0;
13450                         asoc->stream_locked = 0;
13451                 }
13452                 SCTP_TCB_SEND_UNLOCK(stcb);
13453                 if (uio->uio_resid == 0) {
13454                         got_all_of_the_send = 1;
13455                 }
13456         } else {
13457                 /* We send in a 0, since we do NOT have any locks */
13458                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13459                 top = NULL;
13460                 if (srcv->sinfo_flags & SCTP_EOF) {
13461                         /*
13462                          * This should only happen for Panda for the mbuf
13463                          * send case, which does NOT yet support EEOR mode.
13464                          * Thus, we can just set this flag to do the proper
13465                          * EOF handling.
13466                          */
13467                         got_all_of_the_send = 1;
13468                 }
13469         }
13470         if (error) {
13471                 goto out;
13472         }
13473 dataless_eof:
13474         /* EOF thing ? */
13475         if ((srcv->sinfo_flags & SCTP_EOF) &&
13476             (got_all_of_the_send == 1)) {
13477                 SCTP_STAT_INCR(sctps_sends_with_eof);
13478                 error = 0;
13479                 if (hold_tcblock == 0) {
13480                         SCTP_TCB_LOCK(stcb);
13481                         hold_tcblock = 1;
13482                 }
13483                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13484                     TAILQ_EMPTY(&asoc->sent_queue) &&
13485                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13486                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13487                                 goto abort_anyway;
13488                         }
13489                         /* there is nothing queued to send, so I'm done... */
13490                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13491                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13492                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13493                                 struct sctp_nets *netp;
13494
13495                                 /* only send SHUTDOWN the first time through */
13496                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13497                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13498                                 }
13499                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13500                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13501                                 sctp_stop_timers_for_shutdown(stcb);
13502                                 if (stcb->asoc.alternate) {
13503                                         netp = stcb->asoc.alternate;
13504                                 } else {
13505                                         netp = stcb->asoc.primary_destination;
13506                                 }
13507                                 sctp_send_shutdown(stcb, netp);
13508                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13509                                     netp);
13510                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13511                                     asoc->primary_destination);
13512                         }
13513                 } else {
13514                         /*-
13515                          * we still got (or just got) data to send, so set
13516                          * SHUTDOWN_PENDING
13517                          */
13518                         /*-
13519                          * XXX sockets draft says that SCTP_EOF should be
13520                          * sent with no data.  currently, we will allow user
13521                          * data to be sent first and move to
13522                          * SHUTDOWN-PENDING
13523                          */
13524                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13525                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13526                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13527                                 if (hold_tcblock == 0) {
13528                                         SCTP_TCB_LOCK(stcb);
13529                                         hold_tcblock = 1;
13530                                 }
13531                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13532                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13533                                 }
13534                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13535                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13536                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13537                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13538                                         struct mbuf *op_err;
13539                                         char msg[SCTP_DIAG_INFO_LEN];
13540
13541                         abort_anyway:
13542                                         if (free_cnt_applied) {
13543                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13544                                                 free_cnt_applied = 0;
13545                                         }
13546                                         snprintf(msg, sizeof(msg),
13547                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13548                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13549                                             msg);
13550                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13551                                             op_err, SCTP_SO_LOCKED);
13552                                         /*
13553                                          * now relock the stcb so everything
13554                                          * is sane
13555                                          */
13556                                         hold_tcblock = 0;
13557                                         stcb = NULL;
13558                                         goto out;
13559                                 }
13560                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13561                                     asoc->primary_destination);
13562                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13563                         }
13564                 }
13565         }
13566 skip_out_eof:
13567         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13568                 some_on_control = 1;
13569         }
13570         if (queue_only_for_init) {
13571                 if (hold_tcblock == 0) {
13572                         SCTP_TCB_LOCK(stcb);
13573                         hold_tcblock = 1;
13574                 }
13575                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13576                         /* a collision took us forward? */
13577                         queue_only = 0;
13578                 } else {
13579                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13580                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13581                         queue_only = 1;
13582                 }
13583         }
13584         if ((net->flight_size > net->cwnd) &&
13585             (stcb->asoc.sctp_cmt_on_off == 0)) {
13586                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13587                 queue_only = 1;
13588         } else if (asoc->ifp_had_enobuf) {
13589                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13590                 if (net->flight_size > (2 * net->mtu)) {
13591                         queue_only = 1;
13592                 }
13593                 asoc->ifp_had_enobuf = 0;
13594         }
13595         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13596         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13597             (stcb->asoc.total_flight > 0) &&
13598             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13599             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13600                 /*-
13601                  * Ok, Nagle is set on and we have data outstanding.
13602                  * Don't send anything and let SACKs drive out the
13603                  * data unless wen have a "full" segment to send.
13604                  */
13605                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13606                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13607                 }
13608                 SCTP_STAT_INCR(sctps_naglequeued);
13609                 nagle_applies = 1;
13610         } else {
13611                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13612                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13613                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13614                 }
13615                 SCTP_STAT_INCR(sctps_naglesent);
13616                 nagle_applies = 0;
13617         }
13618         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13619                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13620                     nagle_applies, un_sent);
13621                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13622                     stcb->asoc.total_flight,
13623                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13624         }
13625         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13626                 /* we can attempt to send too. */
13627                 if (hold_tcblock == 0) {
13628                         /*
13629                          * If there is activity recv'ing sacks no need to
13630                          * send
13631                          */
13632                         if (SCTP_TCB_TRYLOCK(stcb)) {
13633                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13634                                 hold_tcblock = 1;
13635                         }
13636                 } else {
13637                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13638                 }
13639         } else if ((queue_only == 0) &&
13640                     (stcb->asoc.peers_rwnd == 0) &&
13641             (stcb->asoc.total_flight == 0)) {
13642                 /* We get to have a probe outstanding */
13643                 if (hold_tcblock == 0) {
13644                         hold_tcblock = 1;
13645                         SCTP_TCB_LOCK(stcb);
13646                 }
13647                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13648         } else if (some_on_control) {
13649                 int num_out, reason, frag_point;
13650
13651                 /* Here we do control only */
13652                 if (hold_tcblock == 0) {
13653                         hold_tcblock = 1;
13654                         SCTP_TCB_LOCK(stcb);
13655                 }
13656                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13657                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13658                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13659         }
13660         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13661             queue_only, stcb->asoc.peers_rwnd, un_sent,
13662             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13663             stcb->asoc.total_output_queue_size, error);
13664
13665 out:
13666 out_unlocked:
13667
13668         if (local_soresv && stcb) {
13669                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13670         }
13671         if (create_lock_applied) {
13672                 SCTP_ASOC_CREATE_UNLOCK(inp);
13673         }
13674         if ((stcb) && hold_tcblock) {
13675                 SCTP_TCB_UNLOCK(stcb);
13676         }
13677         if (stcb && free_cnt_applied) {
13678                 atomic_add_int(&stcb->asoc.refcnt, -1);
13679         }
13680 #ifdef INVARIANTS
13681         if (stcb) {
13682                 if (mtx_owned(&stcb->tcb_mtx)) {
13683                         panic("Leaving with tcb mtx owned?");
13684                 }
13685                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13686                         panic("Leaving with tcb send mtx owned?");
13687                 }
13688         }
13689 #endif
13690         if (top) {
13691                 sctp_m_freem(top);
13692         }
13693         if (control) {
13694                 sctp_m_freem(control);
13695         }
13696         return (error);
13697 }
13698
13699
13700 /*
13701  * generate an AUTHentication chunk, if required
13702  */
13703 struct mbuf *
13704 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13705     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13706     struct sctp_tcb *stcb, uint8_t chunk)
13707 {
13708         struct mbuf *m_auth;
13709         struct sctp_auth_chunk *auth;
13710         int chunk_len;
13711         struct mbuf *cn;
13712
13713         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13714             (stcb == NULL))
13715                 return (m);
13716
13717         if (stcb->asoc.auth_supported == 0) {
13718                 return (m);
13719         }
13720         /* does the requested chunk require auth? */
13721         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13722                 return (m);
13723         }
13724         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13725         if (m_auth == NULL) {
13726                 /* no mbuf's */
13727                 return (m);
13728         }
13729         /* reserve some space if this will be the first mbuf */
13730         if (m == NULL)
13731                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13732         /* fill in the AUTH chunk details */
13733         auth = mtod(m_auth, struct sctp_auth_chunk *);
13734         memset(auth, 0, sizeof(*auth));
13735         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13736         auth->ch.chunk_flags = 0;
13737         chunk_len = sizeof(*auth) +
13738             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13739         auth->ch.chunk_length = htons(chunk_len);
13740         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13741         /* key id and hmac digest will be computed and filled in upon send */
13742
13743         /* save the offset where the auth was inserted into the chain */
13744         *offset = 0;
13745         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13746                 *offset += SCTP_BUF_LEN(cn);
13747         }
13748
13749         /* update length and return pointer to the auth chunk */
13750         SCTP_BUF_LEN(m_auth) = chunk_len;
13751         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13752         if (auth_ret != NULL)
13753                 *auth_ret = auth;
13754
13755         return (m);
13756 }
13757
13758 #ifdef INET6
13759 int
13760 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13761 {
13762         struct nd_prefix *pfx = NULL;
13763         struct nd_pfxrouter *pfxrtr = NULL;
13764         struct sockaddr_in6 gw6;
13765
13766         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13767                 return (0);
13768
13769         /* get prefix entry of address */
13770         ND6_RLOCK();
13771         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13772                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13773                         continue;
13774                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13775                     &src6->sin6_addr, &pfx->ndpr_mask))
13776                         break;
13777         }
13778         /* no prefix entry in the prefix list */
13779         if (pfx == NULL) {
13780                 ND6_RUNLOCK();
13781                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13782                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13783                 return (0);
13784         }
13785         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13786         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13787
13788         /* search installed gateway from prefix entry */
13789         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13790                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13791                 gw6.sin6_family = AF_INET6;
13792                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13793                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13794                     sizeof(struct in6_addr));
13795                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13796                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13797                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13798                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13799                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13800                         ND6_RUNLOCK();
13801                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13802                         return (1);
13803                 }
13804         }
13805         ND6_RUNLOCK();
13806         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13807         return (0);
13808 }
13809 #endif
13810
13811 int
13812 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13813 {
13814 #ifdef INET
13815         struct sockaddr_in *sin, *mask;
13816         struct ifaddr *ifa;
13817         struct in_addr srcnetaddr, gwnetaddr;
13818
13819         if (ro == NULL || ro->ro_rt == NULL ||
13820             sifa->address.sa.sa_family != AF_INET) {
13821                 return (0);
13822         }
13823         ifa = (struct ifaddr *)sifa->ifa;
13824         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13825         sin = &sifa->address.sin;
13826         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13827         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13828         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13829         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13830
13831         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13832         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13833         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13834         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13835         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13836         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13837                 return (1);
13838         }
13839 #endif
13840         return (0);
13841 }